Skocz do pozycji: 1.

Tytuł:

On the inverse problems of Lyapunov theorem and Riccati equation

Autorzy:

Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/205963.pdf

Data publikacji:

2001

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

teoria systemu liniowego
zagadnienie odwrotne
inverse problems
linear systems theory

Opis:

In this note, the inverse problem of Lyapunov theorem is reconsidered and the inverse problem of Riccati equation is introduced. Simple proofs are provided to guarantee the solution of such problems.

Źródło:

Control and Cybernetics; 2001, 30, 2; 227-230
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Less conservative results for the exponential stability of uncertain time-delay systems

Autorzy:

Sun, Y. J.

Powiązania:

https://bibliotekanauki.pl/articles/970980.pdf

Data publikacji:

2005

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

delay-independent criterion
exponential stability
time-delay systems

Opis:

In this paper, global exponential stability of a class of uncertain systems with multiple time delays is investigated. Simple delay-independent criterion is derived to guarantee the global exponential stability of such systems. The main result is sharper than the recent result reported in the literature. Two numerical examples are also provided to illustrate the main result.

Źródło:

Control and Cybernetics; 2005, 34, 4; 1045-1055
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

The eigenvalue derivatives of linear damped systems

Autorzy:

Sun, Y.-J.

Powiązania:

https://bibliotekanauki.pl/articles/970588.pdf

Data publikacji:

2003

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

pochodna wartości własnej
derivatives of eigenvalues
linear damped systems

Opis:

In this note, the derivatives of eigenvalues with respect to the model parameters for linear damped systems is proposed by means of kronecker algebra and matrix calculus. A numerical example is also provided to illustrate the use of the main result.

Źródło:

Control and Cybernetics; 2003, 32, 4; 735-741
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

A simple criterion for the global exponential stability of uncertain T-S fuzzy singularly perturbed discrete-time systems

Autorzy:

Sun, Y. J.

Powiązania:

https://bibliotekanauki.pl/articles/205643.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

Takagi-Sugeno fuzzy system
singularly perturbed systems
uncertain systems

Opis:

In this paper, the global exponential stability for a class of uncertain Takagi-Sugeno (T-S) fuzzy singularly perturbed systems is investigated. Based on time-domain approach with difference inequality technique, a simple criterion is derived to guarantee the global exponential stability of such systems. The upper bound of the singular perturbation parameter is also provided by estimating the unique positive zero of specific function. Finally, two numerical examples are given to demonstrate the feasibility and effectiveness of the obtained result.

Źródło:

Control and Cybernetics; 2011, 40, 1; 59-71
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Szacowanie współczynników interakcyjnych do analizy uszkodzeń interakcyjnych
Estimating interactive coefficients for analysing interactive failures

Autorzy:

Sun, Y.
Ma, L.

Powiązania:

https://bibliotekanauki.pl/articles/301078.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

uszkodzenia zależne
uszkodzenia interakcyjne
współczynniki interakcyjne
niezawodność
system złożony
dependent failures
interactive failures
interactive coefficients
reliability
complex system

Opis:

Środki techniczne to często systemy złożone. W złożonym systemie, między komponentami często zachodzą interakcje uszkodzeniowe prowadzące do uszkodzeń interakcyjnych. Występowanie w systemie uszkodzeń interakcyjnych może prowadzić do wzmożonego prawdopodobieństwa uszkodzenia. Stąd też, przy projektowaniu i eksploatacji złożonych systemów inżynieryjnych, może zaistnieć potrzeba wzięcia pod uwagę uszkodzeń interakcyjnych. Odnosząc się do tego zagadnienia, Sun i in. stworzyli analityczny model uszkodzeń interakcyjnych. W modelu tym stopień interakcji między dwoma komponentami jest wyrażany przez współczynniki interakcyjne. Aby można było użyć tego modelu do analizy uszkodzeń należy więc oszacować współczynniki interakcyjne. Jednakże nie opisano jeszcze metod szacowania współczynników interakcyjnych. Aby wypełnić tę lukę, w niniejszej pracy zaprezentowano pięć metod szacowania współczynników interakcyjnych, wliczając w to metodę probabilistyczną, metodę analizy opartej na danych o uszkodzeniach, eksperymentalną metodę laboratoryjną, metodę opartą na mechanizmie interakcji między uszkodzeniami oraz metodę oceny eksperckiej. Podano przykłady pokazujące zastosowania proponowanych metod, a także dokonano porównania między nimi.
Engineering assets are often complex systems. In a complex system, components often have failure interactions which lead to interactive failures. A system with interactive failures may lead to an increased failure probability. Hence, one may have to take the interactive failures into account when designing and maintaining complex engineering systems. To address this issue, Sun et al have developed an analytical model for the interactive failures. In this model, the degree of interaction between two components is represented by interactive coefficients. To use this model for failure analysis, the related interactive coefficients must be estimated. However, methods for estimating the interactive coefficients have not been reported. To fill this gap, this paper presents five methods to estimate the interactive coefficients including probabilistic method; failure data based analysis method; laboratory experimental method; failure interaction mechanism based method; and expert estimation method. Examples are given to demonstrate the applications of the proposed methods. Comparisons among these methods are also presented.

Źródło:

Eksploatacja i Niezawodność; 2010, 2; 67-72
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Tubular shell infestations in some Mississippian spirilophous brachiopods

Autorzy:

Balinski, A.
Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/20057.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

paleontology
tubular shell
shell
infestation
Mississippian brachiopod
spirilophous brachiopod
brachiopod
Brachiopoda
Spiriferida
Spiriferinida
biotic interaction
endosymbiont
Muhua Formation
China

Opis:

Evidence of brachiopod shell infestation by tube dwelling parasitic–commensal organisms is very rare in the fossil record. The oldest record of this kind of biotic interaction is known as Eodiorygma acrotretophilia from the Early Cambrian phosphatic acrotretoid Linnarsonia. The youngest evidence of parasitic infestation was documented in the Early Cretaceous rhynchonellide Peregrinella multicarinata. Two other records of vermiform tubes inside brachiopod shells come from the Devonian. These are Diorygma atrypophilia, infesting Givetian atrypide shells, and Burrinjuckia spiriferidophilia, found in some Emsian spiriferides. Here we describe the fifth record of this kind of infestation for which a name Haplorygma dorsalis ichnogen. et ichnosp. nov. is proposed. The tubular infestation structure was revealed in two silicified dorsal valves of spirolophous brachiopods found in the Mississippian Muhua Formation of the Southern China. The affinity of the tube−dwelling organism is rather enigmatic, but its annelid relationship and kleptoparasitic nature seems highly probable. In addition, the phoronid affinity of Diorygma is here questioned.

Źródło:

Acta Palaeontologica Polonica; 2010, 55, 4
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Silicified Mississippian brachiopods from Muhua, Southern China: Lingulids, craniids, strophomenids, productids, orthotetids, and orthids

Autorzy:

Sun, Y
Balinski, A.

Powiązania:

https://bibliotekanauki.pl/articles/22016.pdf

Data publikacji:

2008

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

paleontology
China
Orthida
Craniida
Brachiopoda
Mississippian brachiopod
Carboniferous
Productida
Strophomenida
Orthotetida
silicification
Lingulida
brachiopod
Muhua

Opis:

This paper describes 37 species (4 new) belonging to 27 genera (1 new), 14 families, and 6 orders (Lingulida, Craniida, Strophomenida, Productida, Orthotetida, and Orthida) of silicified brachiopods from the middle Tournaisian (Mississippian, lower Carboniferous) of the vicinity of Gedongguan and Muhua villages (southern China). All specimens come from acid etching of detrital and oolitic limestone lenses scattered within grey to black laminated basinal micrite and marl of the Muhua Formation. The formation, which attains about 1–10 meters in thickness, is dated to the Siphonodella crenulata Zone. More than 10,000 silicified brachiopod specimens belonging to about 70 species were recovered from over 900 kg of the sampled limestone lenses, the most diverse brachiopod fauna of that age. The characteristic feature of the studied material is the prevailing disarticulation and fragmentation of skeletal parts due to their down slope transportation into a deeper water environment. Within Lingulida, one linguloid and one discinoid species are described. Craniida are represented by five species including Nematocrania pilea sp. nov. Strophomenida are represented by fragmentarily preserved specimens belonging to one species. The most diverse are Productida, which are represented by 7 chonetidine and 12 productidine species; new are Subglobosochonetes gedongguanensis sp. nov. and Globosochonetes gracilis sp. nov. New data on morphology of larval stage of Argentiproductus margaritaceus and its mode of attachment are presented. Orthotetida is represented by 5 species including Lamellispina spinosa gen. et sp. nov. Orthida is represented by 3, mostly cosmopolitan species. This study of a middle Tournaisian brachiopod fauna from Muhua, together with published data on the Mississippian brachiopods from other regions of South China, allow to study the Devonian–Carboniferous biotic crisis and post−crisis recovery.

Źródło:

Acta Palaeontologica Polonica; 2008, 53, 3
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:

Chondrichthyan remains from the Lower Carboniferous of Muhua, Southern China

Autorzy:

Ginter, M.
Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/22216.pdf

Data publikacji:

2007

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Carboniferous
China
Chondrichthyes
Elasmobranchii
Euchondrocephali
Lower Carboniferous
Muhua
chondrichthyan
remains
tooth
Tournaisian
paleontology
systematics
morphology

Opis:

The shallow water assemblage of chondrichthyan microremains, teeth, tooth plates and scales, from the middle Tournaisian (Mississippian) of the vicinity of Muhua village, Guizhou province, southern China, is thus far the richest and most diverse association of this age collected from a single locality and horizon, and represents a chondrichthyan community very restricted in time and space. It was recovered from a small bioclastic limestone lens, MH−1, occurring among basinal marls near the base of the Muhua Formation, and dated as to the Siphonodella crenulata conodont Zone. The majority of the fauna presented here consists of teeth with euselachian−type bases and crushing crowns belonging to bottom−dwelling durophagous chondrichthyans, most probably feeding on shelly invertebrates such as the abundant brachiopods. We assigned most of these teeth to Euselachii (six species, among them Cassisodus margaritae gen. et sp. nov.), Petalodontiformes (two species), Holocephali (five species), and Euchondrocephali incertae sedis (Cristatodens sigmoidalis gen. et sp. nov.). We also identified primitive polycuspid, clutching teeth representing Phoebodontiformes (Thrinacodus bicuspidatus sp. nov.), Symmoriiformes, and Ctenacanthiformes. The scales are typical growing, compound forms of the protacrodont, ctenacanth, and hybodont types. Two problematic denticulated plates were found, one of which resembles mandibular or palatal plates of Sibyrhynchus (Iniopterygii). Several of the identified chondrichthyan taxa have hitherto been known only from Laurussia, especially from the British Isles and central USA. In particular we found the first record of Chondrenchelyssp. and Diclitodus denshumani outside their type locality. Th. bicuspidatus sp. nov., also known from Nevada, Iran, and NW Australia, appears to be a cosmopolitan, middle Tournaisian index fossil.

Źródło:

Acta Palaeontologica Polonica; 2007, 52, 4
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Silicified Mississippian brachiopods from Muhua, southern China: Rhynchonellides, athyridides, spiriferides, spiriferinides, and terebratulides

Autorzy:

Sun, Y.
Balinski, A.

Powiązania:

https://bibliotekanauki.pl/articles/22794.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Opis:

The second part of the monograph of the silicified brachiopod fauna from the Muhua Formation concludes with the descriptions of 36 species belonging to 32 genera and 22 families. Eighteen species are reported in open nomenclature. Two new rhynchonellide species are described: Coledium bruntoni sp. nov. and Pleuropugnoides calcaris sp. nov. The described brachiopod fauna is dominated by spiriferides (16 species), rhynchonellides (9 species), and athyridides (7 species), while spiriferinides and terebratulides are represented by 1 and 3 species, respectively. The brachiopod fauna from the Muhua Formation is characterised by remarkably high species diversity. Together with those species described in the first part of the monograph the fauna includes 69 species. The study of the brachiopod faunal dynamics during the late Famennian–late Tournaisian in southern China reveals that after a decline in the generic diversity at the Devonian–Carboniferous boundary (D–C boundary event), the Early Tournaisian brachiopod fauna shows slight impoverishment. In the middle Tournaisian the brachiopod fauna from South China shows an explosive increase in diversity on generic level which is well exemplified by the material from Muhua. The brachiopod fauna from the Muhua Formation represents a fully recovered high diversity fauna consisting of forms representing a wide spectrum of attachment strategies as well as highly specialised forms (e.g., micromorphs) adapted to special kinds of ecological niches. Numerous evidence of the biotic interaction between brachiopods and other co−occurring fauna have been revealed in the material from Muhua. These are drill holes of predatory origin, borings made on dead shells as post−mortem infestation, shell damages and malformations, and parasitic infestations.

Źródło:

Acta Palaeontologica Polonica; 2011, 56, 4
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:

Preservation of soft tissues in an Ordovician linguloid brachiopod from China

Autorzy:

Balinski, A.
Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/21359.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

preservation
soft tissue
Ordovician
linguloid brachiopod
brachiopod
Leontiella
fauna
geographic location
shell
Hubei province
China

Opis:

The findings of preserved soft body parts including pedicle in the linguloid brachiopods are extremely rare in the fossil record of which the early Cambrian Chengjiang (southern China) and Burgess Shale (British Columbia) faunas are the most important. However, these characteristic Cambrian soft−bodied faunas largely disappeared from the fossil re− cord well before the end of the Cambrian. Here we describe the first record of the pedicle in a linguloid brachiopod from the post−Cambrian strata, preserved with remarkable fidel− ity. Contrary to the Chengjiang and Burgess Shale−type fau− nas which are commonly preserved as essentially two−di− mensional aluminosilicate or degraded organic carbon films or pyritized compressed fossils, the specimens now recov− ered from the Ordovician of China show a three−dimen− sional, pyritized pedicle with preserved external morphol− ogy, in detail. The presence of streamlined shell shape and burrowing shell sculpture in our specimens supports an as− sumption for infaunal mode of life of the genus. Since all linguloid brachiopods of the early Cambrian are inter− preted as epifaunal or semi−infaunal, it seems that the here described Ordovician linguloid is the oldest representative of fully infaunal brachiopods. Apparently, the long vermi− form and flexible linguloid pedicle has appeared as a func− tionally optimized construction.

Źródło:

Acta Palaeontologica Polonica; 2013, 58, 1
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Relationship between the impedance of a multi-pin probe and soil water content

Autorzy:

Sun, Y.
Kromer, K.H.

Powiązania:

https://bibliotekanauki.pl/articles/24149.pdf

Data publikacji:

2003

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

soil water
relationship
dielectrical constant
impedance
multi-pin probe
water content

Źródło:

International Agrophysics; 2003, 17, 1
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Helicosporidia: a genomic snapshot of an early transition to parasitism

Autorzy:

Sun, Y.
Pombert, J.-F.

Powiązania:

https://bibliotekanauki.pl/articles/58197.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Botaniczne

Tematy:

Helicosporidium
green alga
alga
comparative genomics
entomopathogen
parasitism
parasite
invertebrate

Opis:

Helicosporidia are gut parasites of invertebrates. These achlorophyllous, non-photosynthetic green algae are the first reported to infect insects. Helicosporidia are members of the green algal class Trebouxiophyceae and are further related to the photosynthetic and non-photosynthetic genera Auxenochlorella and Prototheca, respectively, the latter of which can also turn to parasitism under opportunistic conditions. Molecular analyses suggest that Helicosporidia diverged from other photosynthetic trebouxiophytes less than 200 million years ago and that its adaptation to parasitism is therefore recent. In this minireview, we summarize the current knowledge of helicosporidian genomics. Unlike many well-known parasitic lineages, the Helicosporidium sp. organelle and nuclear genomes have lost surprisingly little in terms of coding content aside from photosynthesis-related genes. While the small size of its nuclear genome compared to other sequenced trebouxiophycean representatives suggests that Helicosporidium is going through a streamlining process, this scenario cannot be ascertained at this stage. Genome expansions and contractions have occurred independently multiple times in the green algae, and the small size of the Helicosporidium genome may reflect a lack of expansion from a lean ancestor state rather than a tendency towards reduction.

Źródło:

Acta Societatis Botanicorum Poloniae; 2014, 83, 4
0001-6977
2083-9480

Pojawia się w:

Acta Societatis Botanicorum Poloniae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Effect of the Thermal Treatment on the Microstructure and Magnetic Property of $Fe_{68}Zr_{20}B_{12}$ Alloy Prepared by Mechanical Alloying

Autorzy:

Sun, Y.
Yu, W.
Hua, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1505353.pdf

Data publikacji:

2011-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.37.Lp
61.05.Qr

Opis:

$Fe_{68}Zr_{20}B_{12}$ amorphous alloy prepared by mechanical alloying technique of 60 h of duration was annealed at different temperatures (420-720°C) during 1 h. Microstructure and magnetic property of as-milled and annealed alloy were investigated by X-ray diffraction, transmission electron microscopy, the Mössbauer spectroscopy and vibrating sample magnetometer techniques. $Fe_{68}Zr_{20}B_{12}$ powders milled during 60 h exhibit amorphous character. After annealing at 420°C, α-Fe phase precipitates from amorphous matrix. Transmission electron microscopy analysis shows the nucleation and growth of α-Fe grains. The Mössbauer results of the annealed alloy at 670°C show that the $Fe_3B$ phase precipitates already and there is still remaining amorphous phase. Coercivity increases with increasing annealing temperature, which is closely related to the microstructures after annealing.

Źródło:

Acta Physica Polonica A; 2011, 119, 3; 374-377
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Effect of peak-aged heat treatment on corrosion behavior of the AA6063 alloy containing Al₃Ti
Wpływ obróbki cieplnej na korozje stopów AA6063 zawierajacych Al.3Ti

Autorzy:

Cevik, E.
Sun, Y.
Ahlatci, H.

Powiązania:

https://bibliotekanauki.pl/articles/355080.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

obróbka cieplna
właściwości korozyjne
stopy aluminium
non ferrous metals and alloys
casting
corrosion
microstructure

Opis:

The purpose of this study is to analyse the microstructure and corrosion properties of homogenised and aged AA 6063 aluminium alloys, containing up to 2% Ti, after the conventional casting technique. The microstructure of the homogenised and aged alloys was examined using an optic microscope, and scanning electron microscope. The micro-hardness test was used for the hardness measurements of the investigated alloys. Corrosion tests were performed by suspending samples of certain sizes into 30 gr/l NaCl + 10 ml/l HCl solutions, measuring the mass loss; potentiodynamic polarisation measurements were carried out in the same solution. The microstructure characterization of the investigated alloys shows the Al (matrix), non-shaped dark globular grey-coloured phase and rod-shaped phases formed at the grain boundaries. The non-shaped dark grey-coloured phase is Mg₂Si. The rod-shaped phase, formed in the microstructure of the Ti-added AA 6063 alloys, is Al₃Ti. The Ti content of the alloy increases, the Al₃Ti phase tends to elongate and become plated. The results of the corrosion tests proved that the corrosion rate decreased in alloys containing less than 1% Ti, and the rate of corrosion increased in alloys containing more than 1% Ti, regardless of whether the alloys were homogenised and aged. Another observation was that aging heat treatment improved corrosion resistance.
Celem niniejszej pracy jest analiza mikrostruktury i właściwości korozyjnych poddanych obróbce cieplnej stopów aluminium AA 6063, zawierających do 2% Ti, po odlewaniu konwencjonalnym. Mikrostrukturę homogenizowanych stopów zbadano za pomocą mikroskopii optycznej i skaningowej mikroskopii elektronowej. Test mikrotwardości zastosowano do pomiaru twardości badanych stopów. Badania korozyjne przeprowadzono poprzez zawieszenie próbki o określonych rozmiarach w roztworze 30 gr/l NaCl + 10 ml/l HCl i pomiar ubytku masy; pomiary potencjo-dynamicznej polaryzacji zostały przeprowadzone w tym samym roztworze. Charakterystyka mikrostruktury badanych stopów pokazuje matryce Al; ciemnoszare, nieregularne wydzielenia fazy Mg₂Si; oraz na granicach ziaren pręcikowe wydzielenia fazy Al₃Ti, obecne w mikrostrukturze stopów AA 6063 z dodatkiem Ti. Ze wzrostem zawartości Ti, wydzielenia fazy Al₂Ti stają się wydłużone i płytkowe. Wyniki testów korozyjnych wykazały, że szybkość korozji spadła w stopach zawierających mniej niż 1% Ti, a wzrosła w stopach zawierających więcej niż 1% Ti, niezależnie od tego, czy stopy były homogenizowane i starzone. Zaobserwowano, że obróbka cieplna podwyższa odporność stopów na korozję.

Źródło:

Archives of Metallurgy and Materials; 2012, 57, 2; 469-477
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:

Soil aggregate size distribution and total organic carbon in intra-aggregate fractions as affected by addition of biochar and organic amendments

Autorzy:

Odugbenro, G.O.
Liu, Z.
Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/971185.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

biochar
aggregate stability
microbial biomass carbon
total organic carbon

Opis:

A two-year field trial on maize (Zea mays L.) production was established to determine the influence of biochar, maize straw, and poultry manure on soil aggregate stability, aggregate size distribution, total organic carbon (TOC), and soil microbial biomass carbon (MBC). Seven treatments with four replications, namely CK, control; S, 12.5 Mg ha-1 straw; B 1 , 12.5 Mg ha-1 biochar; B 2 , 25 Mg ha-1 biochar; SB 1 , straw + 12.5 Mg ha-1 biochar; SB 2 , straw + 25 Mg ha-1 bio- char; and M, 25 Mg ha-1 manure were tested at four soil depths (0–10, 10–20, 20–30, and 30–40 cm). Aggregates were grouped into large macro-aggregates (5–2 mm), small macro-aggregates (2–0.25 mm), micro-aggregates (0.25–0.053 mm) and silt + clay (<0.053 mm). Biochar, straw, and manure applications all had significant effects (p < 0.05) on aggregate stability, with B 2 at 20 cm soil depth showing the greatest increase (62.1%). SB 1 of small macro-aggregate fraction showed the highest aggregate proportion (50.59% ± 10.48) at the 20–30 cm soil depth. The high- est TOC was observed in SB 2 (40.9 g kg-1) of large macro-aggregate at 10–20 cm soil depth. Treat- ment effects on soil MBC was high, with B 1 showing the greatest value (600.0 µg g-1) at the 20–30 cm soil depth. Our results showed that application of biochar, straw, and manure to soil increased aggregate stability, TOC as well as MBC.

Źródło:

Polish Journal of Soil Science; 2020, 53, 1
0079-2985

Pojawia się w:

Polish Journal of Soil Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

A new aviculopectinid bivalve from the Early Carboniferous of Guizhou, China

Autorzy:

Fang, Z.-J.
Sun, Y.
Balinski, A.

Powiązania:

https://bibliotekanauki.pl/articles/22541.pdf

Data publikacji:

2006

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Aviculopectinidae
Bivalvia
Carboniferous
China
Early Carboniferous
Girtypecten
Guizhou Province
Muhua Formation
Sinopecten
aviculopectinid bivalve
bivalve
paleontology

Opis:

Six silicified left valves including one nearly complete were obtained from acid residues of two samples collected from the Early Carboniferous Muhua Formation in Guizhou Province, China. The Chinese specimens have reticulate ornament and a large asymmetrical aviculopectinid−type resilifer and are much like Girtypecten from Permian rocks in the United States. However, the Chinese material shows only unicostate radial ornament, whereas Girtypecten is multicostate. Thus, a new taxon Girtypecten (Sinopecten) newelli subgen. et sp. nov. is proposed. The conodont assemblage occurring with G. (Sinopecten) newelli dates the new scallop as Tournaisian (the conodont Lower Siphonodella crenulata Zone); this is the oldest known occurrence of Girtypecten.

Źródło:

Acta Palaeontologica Polonica; 2006, 51, 3
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Kinetic modelling of NO heterogeneous radiation-catalytic oxidation on the TiO2 surface in humid air under the electron beam irradiation

Autorzy:

Nichipor, H.
Sun, Y.
Chmielewski, A. G.

Powiązania:

https://bibliotekanauki.pl/articles/148642.pdf

Data publikacji:

2017

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

electron beam
catalyst
reaction kinetics
NOx removal
irradiation
modelling

Opis:

Theoretical study of NOx removal from humid air by a hybrid system (catalyst combined with electron beam) was carried out. The purpose of this work is to study the possibility to decrease energy consumption for NOx removal. The kinetics of radiation catalytic oxidation of NO on the catalyst TiO2 surface under electron beam irradiation was elaborated. Program Scilab 5.3.0 was used for numerical simulations. Influential parameters such as inlet NO concentration, dose, gas flow rate, water concentration and catalyst contents that can affect NOx removal efficiency were studied. The results of calculation show that the removal effiiency of NOx might be increased by 8–16% with the presence of a catalyst in the gas irradiated field.

Źródło:

Nukleonika; 2017, 62, 3; 235-240
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Research on Mechanism Analysis and Elimination Method for the Tufted Carpet Stop Mark
Badanie mechanizmu i metody eliminacji śladów zatrzymania maszyny wytwarzającej dywany wiązane

Autorzy:

Xu, Y.
Sun, Z.
Meng, Z
Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/232304.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

creep property
stop mark
tufted carpet
yarn path
yarn tension
dywany wiązane
zatrzymanie pracy maszyny
pełzanie przędzy
maszyna wiążąca

Opis:

The tufted carpet stop mark is an important factor affecting carpet final quality. It is closely related to the change in yarn tension caused by the tufting machine being improperly stopped and the yarn creep properties. The purpose of this paper is to develop a reasonable approach to eliminate the tufted carpet stop mark. Focusing on a typical tufting machine, the tufting equipment system and basic working principle of tufted carpet are briefly described. A yarn path flexing model which integrates yarn feeding parts, yarn guiders and the tufting needle for a typical tufting process is constructed. The yarn tension change is analysed along with the change in the yarn path. A Polypropylene yarn four-component model is used for analysing the relationship between tension and yarn creep properties. The creep property of polypropylene yarn under a certain tension is verified by experiments. According to the yarn tension change in different running positions of the tufting needle, a reasonable method of eliminating the stop mark which stops and restarts the machine in the highest position is put forward. Finally the experimental results prove that the method is effective and feasible.
Ślady zatrzymania pracy maszyn wiążących dywany są ważnym czynnikiem wpływającym na jakość produktu końcowego. Jest to ściśle związane ze zmianą w naprężeniu przędzy spowodowanym przez maszynę wiążącą nieodpowiednio zatrzymaną oraz właściwości pełzania przędzy. Celem pracy było opracowanie metody pozwalającej wyeliminowanie tego zjawiska. W pracy rozważono typową maszynę wiążącą, system wiązania i zasady wiązania dywanów. Opracowano model drogi włókna integrujący elementy prowadzące oraz igły wiążące dla przedstawienia typowego procesu wiązania. Analizowano zmiany naprężenia przędzy wzdłuż jej drogi. Dla przędzy polipropylenowej zastosowano czteroskładnikowy model pozwalający na analizę zależności pomiędzy naprężeniem i pełzaniem przędzy. Właściwości pełzania przędzy polipropylenowej pod określonym naprężeniem zostały zweryfikowane eksperymentalnie. W efekcie opracowano metodę eliminacji śladów zatrzymania, która pozwoliła na efektywną realizację i została sprawdzona doświadczalnie.

Źródło:

Fibres & Textiles in Eastern Europe; 2014, 3 (105); 66-72
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Silicified Anisian [Middle Triassic] spiriferinid brachiopods from Guizhou, South China

Autorzy:

Sun, Z
Hao, W.
Sun, Y.
Jiang, D.

Powiązania:

https://bibliotekanauki.pl/articles/20730.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Triassic
brachiopod
paleontology
China
Anisian
Middle Triassic
Spiriferinida
Brachiopoda
Guanling Formation
spiriferinid brachiopod

Opis:

A newly discovered silicified brachiopod interval from the Upper Member of the Guanling Formation (Late Anisian, Middle Triassic) in Guizhou Province (South China) is described for the first time. The most remarkable feature of this brachiopod assemblage, besides the very good preservation, is the very low taxonomic evenness and diversity. This impoverished, low diversity/high density assemblage is represented by more than 700 recovered specimens belonging to three species within two spiriferinid genera (Pseudospiriferina multicostata, P. pinguis, and Punctospirella fragilis). It is characterized by the overwhelming abundance of an endemic spiriferinid species, P. multicostata, which contributes to more than 90% of the community. Silicified valves of P. multicostata and Punctospirella fragilis allow detailed descriptions of the internal morphology based on direct observation. Brachiopod paleoecology, assessed by considering host−rock lithology, shell disarticulation, and shell size suggests that this endemic brachiopod fauna represents a favourable niche for development of dense brachiopod−dominated communities, i.e., high energy, hard substrate, nutrient rich environment.

Źródło:

Acta Palaeontologica Polonica; 2009, 54, 1; 61-68
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Optymalizacja zależnego od stanu technicznego utrzymania urządzeń dla dwuskładnikowego systemu szeregowego nie wymagająca z góry ustalonej struktury strategii
Condition-based Maintenance Optimisation without a Predetermined Strategy Structure for a Two-component Series System

Autorzy:

Zhang, Z.
Zhou, Y.
Sun, Y.
Ma, L.

Powiązania:

https://bibliotekanauki.pl/articles/301595.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

semimarkowski proces decyzyjny
condition-based maintenance
system wieloskładnikowy
semi-Markov decision process
multi-component system

Opis:

Większość badań nad optymalizacją utrzymania systemów wieloskładnikowych bierze pod uwagę jedynie rozkład czasu życia elementów składowych. Kiedy przyjmie się dla systemów wieloskładnikowych strategię utrzymania urządzeń zależną od ich bieżącego stanu technicznego (condition-based maintenance, CBM), struktura strategii staje się złożona w związku z dużą liczbą stanów składowych oraz ich kombinacji. W konsekwencji, często przyjmuje się pewne z góry ustalone struktury strategii utrzymania przed optymalizacją utrzymania systemu wieloskładnikowego w kontekście CBM. Opracowanie takich z góry ustalonych struktur strategii wymaga jednak specjalistycznego doświadczenia, a i tak brak dowodów na optymalność tych strategii. W artykule zaproponowano metodę optymalizacji utrzymania szeregowego systemu dwuskładnikowego, która nie wymaga wcześniej ustalonej struktury strategii. Proponowaną metodę opracowano na podstawie semimarkowskiego procesu decyzyjnego (SMDP). Badanie symulacyjne pokazało, że za pomocą proponowanej metody można ustalać optymalną strategię utrzymania w sposób adaptacyjny dla różnych kosztów utrzymania oraz parametrów procesów degradacyjnych. Za pomocą symulacji badano także optymalną strukturę strategii utrzymania, jako punkt odniesienia dla przyszłych studiów nad optymalizacją systemów wieloskładnikowych.
Most existing research on maintenance optimisation for multi-component systems only considers the lifetime distribution of the components. When the condition-based maintenance (CBM) strategy is adopted for multi-component systems, the strategy structure becomes complex due to the large number of component states and their combinations. Consequently, some predetermined maintenance strategy structures are often assumed before the maintenance optimisation of a multicomponent system in a CBM context. Developing these predetermined strategy structure needs expert experience and the optimality of these strategies is often not proofed. This paper proposed a maintenance optimisation method that does not require any predetermined strategy structure for a two-component series system. The proposed method is developed based on the semi-Markov decision process (SMDP). A simulation study shows that the proposed method can identify the optimal maintenance strategy adaptively for different maintenance costs and parameters of degradation processes. The optimal maintenance strategy structure is also investigated in the simulation study, which provides reference for further research in maintenance optimisation of multi-component systems.

Źródło:

Eksploatacja i Niezawodność; 2012, 14, 2; 120-129
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

New bizarre micro-spiriferid brachiopod from the Early Carboniferous of China

Autorzy:

Sun, Y
Balinski, A.
Ma, X.
Zhang, Y.

Powiązania:

https://bibliotekanauki.pl/articles/22087.pdf

Data publikacji:

2004

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Carboniferous
verneuiliid brachiopod
brachiopod
China
Muhua Formation
Verneuiliidae
Early Carboniferous
Brachiopoda
Changshunella yangi
paleontology

Opis:

The verneuiliid brachiopod Changshunella yangi gen. et sp. nov. is described from the Early Carboniferous Muhua Formation of Guizhou, China. This rather unusual form is characterized by having very small shell dimensions (2.6–4 mm in length), a very high flat procline ventral interarea, and by having three prominent plications on both valves that are arranged in opposed folding; the last feature is characteristic for the family Verneuiliidae. We suggest that the family has been derived from an offshoot of the stock that produced the superfamilies Spiriferoidea, Paeckelmanelloidea, and Brachythyridoidea by developing opposed folding and loss of dental plates or dental adminicula as exemplified by Verneuilia and Changshunella gen. nov.

Źródło:

Acta Palaeontologica Polonica; 2004, 49, 2
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Strong Laser Field Induced Modifications of Electron-Transfer Processes in Ne⁺-He Collisions

Autorzy:

Lu, Z.
Sun, Y.
Ma, L.
Liu, J.

Powiązania:

https://bibliotekanauki.pl/articles/1032308.pdf

Data publikacji:

2017-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

32.70.Jz
34.50.-s

Opis:

A strong laser field ( ≈ 10¹⁵ W/cm²) induced low-collisional-energy charge transfer process in Ne⁺-He system is explored. In the low collisional energy regime, the cross-section can be ≈ 10¯¹⁷ cm² which is about two orders of magnitude higher than the collision-only process. With increasing collisional energy the cross-section curve displays flattens and the charge capture tends to be practically independent of the laser detuning. In addition, we find that the capture probability in this Ne⁺-He system varies significantly with the laser polarization angle.

Źródło:

Acta Physica Polonica A; 2017, 131, 6; 1519-1524
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Laser Induced Quadrupole-Dipole Collisional Energy Transfer in Ca-Sr

Autorzy:

Lu, Z.
Sun, Y.
Ma, L.
Liu, J.

Powiązania:

https://bibliotekanauki.pl/articles/1400504.pdf

Data publikacji:

2015-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

32.70.Jz
34.50.-s

Opis:

A laser induced quadrupole-dipole collisional energy transfer system of Ca-Sr is proposed and the four-state quadrupole-dipole laser induced collisional energy transfer model is presented. The excitation spectrum calculated for the Ca-Sr system is characterized by a doublet structure and a width which is about twice wider than the dipole-dipole laser induced collisional energy transfer results. Calculating results show that the full width at half peak of the profile becomes larger and the quasi-static wing tends to be a broad flat as the field intensity increases, which are different from the reported results of dipole-dipole laser induced collisional energy transfer processes, dipole-quadrupole and quadrupole-quadrupole. A cross-section of $2.48 \times 10^{-14} cm^{2}$ at a laser field intensity of $5.21 \times 10^{7}$ V/m is obtained which indicates that the quadrupole-dipole process can be an effective way to transfer energy selectively.

Źródło:

Acta Physica Polonica A; 2015, 127, 6; 1620-1624
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Rugose corals and brachiopods across the Frasnian-Famennian boundary in Central Hunan, South China

Autorzy:

Ma, X
Sun, Y.
Hao, W.
Liao, W.

Powiązania:

https://bibliotekanauki.pl/articles/21047.pdf

Data publikacji:

2002

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

fossil distribution
brachiopod fauna
brahiopod
Rugosa
China
rugose coral
Ostracoda
Brachiopoda
Famennian
Frasnian
Devonian
extinction
coral
paleontology
Hunan

Opis:

We present taxonomic revision of rugose corals and brachiopods from several Frasnian–Fammenian (F–F) boundary sections in central Hunan Province, China. Diversity of shallow−water rugose corals gradually increased during the Frasnian, but ended with sudden extinction near the end of Frasnian. Ostracods were abundant during the Frasnian; their extinction coincided with anoxic deposition of the end−Frasnian black shale deposits. The early Famennian ostracod fauna is of low diversity. The brachiopod fauna of the late Frasnian (Palmatolepis rhenana and Pa. linguiformis zones) is dominated by atrypids, small−sized cyrtospiriferids, and the rhynchonellid Hunanotoechia. All atrypids disappeared before the F–F boundary with highest rates of extinction below the boundary (probably low in the Pa. linguiformis Zone). The Frasnian cyrtospiriferid fauna is also of low diversity and dominated by small taxa. All but one of the cyrtospiriferid taxa crossed the F–F boundary. The early Famennian post−extinction recovery brachiopod fauna was the result of rapid radiation of new forms shortly after the terminal Frasnian event. The early Famennian fauna is characterized by diverse cyrtospiriferids, abundant Yunnanellina and productoids. Above the early recovery fauna another fauna was recovered, with brachiopods Hunanospirifer and Yunnanella and is correlated with the late or latest Pa. crepida Zone. Sinalosia rugosa gen. et sp. nov. (Productida) is erected.

Źródło:

Acta Palaeontologica Polonica; 2002, 47, 2
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Application of affine NARMA model to design of adaptive power system stabilizer

Autorzy:

Zhou, J.
Ke, D.
Chung, C. Y.
Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/327256.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

adaptive control
affine
NARMA model
neural network
power system stabilizer
PSS
sterowanie adaptacyjne
sieć neuronowa
stabilizator systemu zasilania

Opis:

An affine nonlinear autoregressive moving average (NARMA) model is derived from the neural network (NN) based general NARMA model in this paper, by using Taylor series expansion. The predictive error of this affine NARMA model will be quite acceptable, at least for the control purpose, if the amplitude of control input is properly limited. Therefore, an adaptive control scheme based on this model is proposed and applied to the design of adaptive power system stabilizer (APSS) since the amplitude of PSS output is usually well limited. The feature of this control scheme is that the control input can be online analytically obtained. Thus, comparing to the traditional NN based APSS (TAPSS), the affine NARMA model based APSS (AAPSS) does not need the training of a NN as neuro-controller, which may be a troublesome and time consuming step during the design. Moreover, the AAPSS can generally perform better than the TAPSS. Simulation studies on a single machine infinite bus system and a multi-machine system show that the AAPSSs can consistently well perform to damp electromechanical oscillations in the systems over a wide range of operating conditions.

Źródło:

Diagnostyka; 2018, 19, 2; 105-114
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Decomposition of toluene in air mixtures under electron beam irradiation

Autorzy:

Sun, Y.
Chmielewski, A. G.
Bułka, S.
Zimek, Z.

Powiązania:

https://bibliotekanauki.pl/articles/148028.pdf

Data publikacji:

2009

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

toluene
4-chlorotoluene
decomposition
electron beam

Opis:

The model gases of toluene-air mixtures were prepared by blowing technical air into liquid toluene and then irradiated with an ILU-6 accelerator located at the Institute of Nuclear Chemistry and Technology (INCT), Poland. It was found that the decomposition efficiency of toluene increases with absorbed dose and decreases with initial concentration of toluene. At 14.5 kGy dose, the decomposition efficiencies of toluene were 50, 37 and 34.5% for the initial concentrations of toluene 32.0, 63.4 and 78.0 ppm, respectively. At 58.0 kGy dose, the decomposition efficiencies of toluene were 93.8 and 78.1%, the initial concentrations of toluene being 32.0 and 63.4 ppm, respectively. Benzaldehyde was identified as one of the by-products of toluene decomposition in an air mixture. The decomposition efficiency and by-product formation under EB irradiation were compared between toluene and 4-chlorotoluene.

Źródło:

Nukleonika; 2009, 54, 2; 65-70
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

The Effect of High Co Addition on the Properties of $Fe_{79}Zr_{9}B_{12}$ and $Fe_{76}Zr_{9}B_{15}$ Alloys

Autorzy:

Yu, W.
Long, D.
Liu, Y.
Sun, Y.
Hua, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1401884.pdf

Data publikacji:

2015-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

65.60.+a
61.43.Dq

Opis:

Thermal properties, microstructure and magnetic properties of $Fe_{79}Zr_{9}B_{12},$ $Fe_{76}Zr_{9}B_{15},$ $Fe_{39.5}Co_{39.5}Zr_{9}B_{12}$ and $Fe_{38}Co_{38}Zr_{9}B_{15}$ alloys were investigated by differential thermal analysis, X-ray diffraction and vibrating sample magnetometer. High Co addition has a significant impact on the properties of alloys. High Co addition increases the main crystallization peak temperature and the crystallization activation energy. Moreover, high Co addition changes the crystallization products and influences the crystallization processes of $Fe_{79}Zr_{9}B_{12}$ and $Fe_{76}Zr_{9}B_{15}$ alloys. The specific saturation magnetization $(M_{s})$ increases and coercivity $(H_{c})$ decreases by high Co additions.

Źródło:

Acta Physica Polonica A; 2015, 128, 3; 340-342
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Prognozowanie trwałości środków technicznych z wykorzystaniem wielu wskaźników degradacji i zdarzeń awaryjnych w ujęciu modelu ciągłej przestrzeni stanów
Asset life prediction using multiple degradation indicators and failure events: a continuous state space model approach

Autorzy:

Zhou, Y.
Ma, L.
Mathew, J.
Sun, Y.
Wolff, R.

Powiązania:

https://bibliotekanauki.pl/articles/301478.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

prognozowanie trwałości środków
model degradacji
algorytm maksymalizacji wartości oczekiwanej
model przestrzeni stanów
asset life prediction
degradation model
expectation-maximisation algorithm
state space model

Opis:

Prognozowanie trwałości środków z wykorzystaniem wskaźników degradacji wiąże się z dwoma zagadnieniami praktycznymi:(1) identyfikacją progów niepewnego uszkodzenia dla wskaźników degradacji oraz (2) łączeniem licznych wskaźników degradacji otrzymanych na podstawie danych z monitorowania stanu. Model degradacji w przestrzeni stanów stanowi efektywne podejście do tych dwóch zagadnień. Jednakże dotychczasowe badania dotyczące tego modelu w dużej mierze przyjmują założenie dyskretnego czasu lub dyskretnych stanów, które wymaga równych odstępów między przeglądami lub dyskretyzacji ciągłych wskaźników degradacji. Aby uniknąć konieczności zakładania dyskretnego czasu i dyskretnych stanów, w niniejszej pracy zaproponowano model przestrzeni stanów oparty na procesie Gamma. Proces Gamma charakteryzuje własność monotoniczna rosnącą, która odpowiada nieodwracalnym procesom degradacji środków technicznych w trakcie jednego cyklu serwisowego. Własność monotoniczna rosnąca ułatwia również ustalenie funkcji prawdopodobieństwa, gdy brane są pod uwagę czasy uszkodzeń. W artykule sformułowano algorytmy estymacji parametrów oraz prognozowania czasu życia dla modelu przestrzeni stanów opartego na procesie Gamma. Dodatkowo określono metodę oceny efektywności wskaźników w modelowaniu degradacji. Proponowany model przestrzeni stanów oparty na procesie Gamma oraz jego algorytmy weryfikowano przy użyciu danych symulacyjnych oraz danych terenowych pozyskanych z przedsiębiorstwa zajmującego się ciekłym gazem ziemnym.
Two practical issues are involved in asset life prediction using degradation indicators: (1) identifying uncertain failure thresholds of degradation indicators and (2) fusing multiple degradation indicators extracted from condition monitoring data. The state space degradation model provides an effective approach to address these two issues. However, existing research on the state space degradation model largely adopts a discrete time or states assumption which requires equal inspection intervals or discretising continuous degradation indicators. To remove the discrete time and states assumptions, this paper proposes a Gamma-based state space model. The Gamma process has a monotonically increasing property that is consistent with the irreversible degradation processes of engineering assets within a single maintenance cycle. The monotonically increasing property also makes the establishment of the likelihood function more straightforward when failure times are considered. In this paper, parameter estimation and lifetime prediction algorithms for the Gamma-based state space model are developed. In addition, an effectiveness evaluation approach for indicators in degradation modelling is established. The proposed Gamma-based state space model and algorithms are validated using both simulated data and a field dataset from a liquefied natural gas company.

Źródło:

Eksploatacja i Niezawodność; 2009, 4; 72-81
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Simulation of decomposition of dichloroethylenes (trans-DCE, cis-DCE, 1,1-DCE)/air under electron beam irradiation

Autorzy:

Sun, Y.
Chmielewski, G.
Bułka, S.
Zimek, Z.
Nichipor, H.

Powiązania:

https://bibliotekanauki.pl/articles/146568.pdf

Data publikacji:

2007

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

trans-dichloroethylene
cis-dichloroethylene
1,1-dichloroethylene
electron beam
decomposition
mechanism

Opis:

On the basis of the experimental results, computer simulations of decomposition of dichloroethylenes for three isomers (trans-DCE, cis-DCE, 1,1-DCE) in air under electron beam were carried out. Computer code “Kinetic” and “Gear” method were used. Calculation results well agree with the experimental results. Decomposition efficiency of DCE is mainly determined by Cl- dissociated secondary electron attachment, followed by Cl radical addition reaction with DCE.

Źródło:

Nukleonika; 2007, 52, 2; 59-67
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Thermal Behavior and Crystallization of $Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10}$ (x = 2, 4, 6) Alloys

Autorzy:

Yu, W.
Sun, Y.
Liu, L.
Dong, L.
Hua, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1492773.pdf

Data publikacji:

2011-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

65.60.+a
61.43.Dq

Opis:

Thermal behavior and microstructure of $Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10}$ (x = 2, 4, 6) alloys were investigated by differential thermal analysis and X-ray diffraction. Both the supercooled liguid region Δ $T_{x}$ and the first crystallization peak temperature $T_{p1}$ are the lowest and the span Δ $T_{p}$ between $T_{p1}$ and $T_{p2}$ is the highest when 4 at.% Fe is substituted by Co. The crystallization activation energy $E_{p1}$ for $Fe_{75}Co_6Zr_7Nb_2B_{10}$ alloy is the minimum for the heating rates ν = 5-20 K/min. $E_{p1}$ for $Fe_{77}Co_4Zr_7Nb_2B_{10}$ alloy is the minimum for the heating rates ν = 20 - 50 K/min. The crystallization processes of $Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10}$ (x = 2, 4, 6) amorphous alloys are similar on the whole, which is as follows: amorphous → amorphous + α-Fe(Co) → α-Fe(Co) + $Fe_3Zr$ + $Fe_2Nb_{0.4}Zr_{0.6}$.

Źródło:

Acta Physica Polonica A; 2011, 120, 6; 1034-1036
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Early and Middle Frasnian brachiopod faunas and turnover on the South China shelf

Autorzy:

Ma, X -P
Becker, R.T.
Li, H.
Sun, Y.-Y.

Powiązania:

https://bibliotekanauki.pl/articles/21029.pdf

Data publikacji:

2006

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Early Frasnian
Middle Frasnian
Frasnian
paleontology
brachiopod fauna
South China shelf
Devonian
Brachiopoda
Cyrtospirifer
faunal turnover

Opis:

The first appearance of the brachiopod Cyrtospirifer and related forms in the Late Devonian of South China significantly postdates the beginning of the Frasnian and the entry of the group in other parts of the world. Scattered data from different sections suggest that its first entry, associated with the emergence of other plicate spiriferids, such as theodossid and conispiriferid brachiopods, was late in the Middle Frasnian. At the same time, many rhynchonellids disappeared or became extinct locally in South China. This brachiopod faunal overturn near the Palmatolepis punctata–Early Pa. hassi zonal boundary is the most significant event in the Early–Middle Frasnian of South China, characterized by about a 35% loss of existing species and the flourishing of the plicate spiriferids, which was coeval with the end of a major biogeochemical perturbation recently recognized in the Pa. punctata Zone. By contrast, atrypid brachiopods do not seem to show any significant diversity change. The brachiopod faunal change was probably related to a (local?) transgressive event in South China, which also brought new pelagic faunas northwards into some intra−shelf deeper water areas, such as the Shetianqiao area in central Hunan Province. Fifteen brachiopod species are described and illustrated, which include some taxa that are first recorded or recognized in South China, e.g., the spiriferid Pyramidaspirifer, which is now known from both North America and South China. One new species, Desquamatia qiziqiaoensis, is erected.

Źródło:

Acta Palaeontologica Polonica; 2006, 51, 4; 789-812
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Theoretical study of dose and dose rate effect on trichloroethylene (HClC=CCl2) decomposition in dry and humid air under electron beam irradiation

Autorzy:

Nichipor, H.
Yacko, S.
Sun, Y.
Chmielewski, A. G.
Zimek, Z.

Powiązania:

https://bibliotekanauki.pl/articles/146819.pdf

Data publikacji:

2008

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

trichloroethylene
electron beam decomposition
computer simulation

Opis:

Experimental data related to C2HCl3 (TCE) removal in dry and humid (200-1000 ppm of H2O) air, respectively, in ambient conditions under electron beam irradiation in the dose range of 1-40 kGy has been published in the literature. Based on the experimental results a theoretical model of C2HCl3 decomposition was proposed for the kinetic mechanism of such process. The active radicals of Cl, O and OH play an important role in the decomposition of TCE. According to the calculations performed, the Cl- dissociative electron attachment predominates in the initial stage of C2HCl3 decomposition. Cl radical accelerates this degradation by chain process in both humid and dry air, respectively. The OH radical produced in humid air also enhances the decomposition process of TCE.

Źródło:

Nukleonika; 2008, 53, 1; 11-16
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

ABA alleviated soybean seedling stress exposed to UV-C radiation

Autorzy:

Yang, L.
Gao, N.
Yang, Y.
Zhang, Y.
Gao, J.
Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/2082655.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

ultraviolet-C
ABA
active oxygen metabolism
flavonoids
soybean

Opis:

In order to understand the roles of abscisis acid in soybean exposed to UV-C radiation, soybean seedlings were exposed to UV-C radiation and ABA was applied. The chlorophyll content, active oxygen metabolism and flavonoids content of soybean seedlings were investigated. The present study revealed that UV-C radiation significantly attenuated the chlorophyll content and suppressed PSII activity. It was observed that the contents of H2O2, malondialdehyde and O2 - were markedly increased, and the activities of antioxidant enzymes such as superoxide dismutase, peroxidase and catalase were enhanced, so were the flavonoids content, whereas the seedling height and biomass were significantly reduced. ABA application improved the activities of superoxide dismutase, peroxidase, catalase and the contents of flavonoids, decreased the contents of H2O2, MDA and O2 -, and also increased the chlorophyll content and enhanced PSII performance, thus enhancing biomass accumulation. The results suggested that ABA alleviated UV-C damage to soybean seedlings by reducing ROS generation and enhancing antioxidase activity. The isoflavones daidzin and genistein were significantly responsive to UV-C.

Źródło:

International Agrophysics; 2020, 34, 1; 115-121
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Synchronization Study and Introductory Experiment οf Laser-Triggered Surface Flashover in Voltage Pulse

Autorzy:

Pan, R.
Wang, J.
Sun, Y.
Sun, G.
Yan, P.
Zhang, D.

Powiązania:

https://bibliotekanauki.pl/articles/1807974.pdf

Data publikacji:

2009-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

52.80.-s
51.50.+v

Opis:

With the aim of studying the characteristics of laser-triggered surface flashover in voltage pulse, synchronization problem of laser pulse and voltage pulse should be solved. A single/double harmonic, with wavelength λ of 1064/532 nm, Q-switched Nd:YAG laser is used to trigger the surface flashover. The synchronization problem is solved using a self-made digital delay/pulse generator. The delay time and jitter of Marx's trigger input and output, Marx's trigger output and Marx's output, laser input and output are respectively measured. Based on the result of the delay time and the timing sequence of the laser triggering system, the synchronization of laser pulse and voltage pulse is obtained through adjusting the channel delay time of digital delay/pulse generator. In addition, introductory experiment of laser-triggered surface flashover is carried out using the flat electrodes and columned insulators.

Źródło:

Acta Physica Polonica A; 2009, 115, 6; 1167-1169
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Characteristics of Magnetic Core in Magnetic Pulse Compression System

Autorzy:

Zhang, D.
Yan, P.
Sun, Y.
Wang, J.
Zhou, Y.
Pan, R.

Powiązania:

https://bibliotekanauki.pl/articles/1807880.pdf

Data publikacji:

2009-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

07.05.Tp
42.65.Re
75.60.Ej

Opis:

In order to obtain the characteristics of magnetic core under ≈0.5-5 μs saturation time, a one-stage magnetic pulse compression circuit without external demagnetization circuits which are commonly used in magnetic compressors is designed. The current through the core is calculated by voltage across the resistive load, and the loop voltage is picked up with a single wire loop and integrated by software. B-H curves are derived from the measured voltage and current wave forms. B-H curves show that the core loss is in inverse proportion to the time to saturation, whereas the percentile core loss decreases as the charging energy increases. While the eddy current loss and dissipated energy are in direct proportion to dB/dt. The low inductance of magnetic switch indicates that the core is saturated and behaves as an air core. By applying custom characteristics to each stage in Pspice simulation, more practical energy transfer in magnetic pulse compression and the effects of leakage current are presented.

Źródło:

Acta Physica Polonica A; 2009, 115, 6; 1001-1003
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Increasing nitrogen use efficiency with lower nitrogen application frequencies using zeolite in rice paddy fields

Autorzy:

Wu, Q.
Chen, T.
Chi, D.
Xia, G.
Sun, Y.
Song, Y.

Powiązania:

https://bibliotekanauki.pl/articles/2082479.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

available nitrogen
nitrogen uptake
root system
labour force

Opis:

Zeolite can effectively regulate the nutrient status in the root zone of crops, thereby increasing nitrogen utilization. However, there has been relatively little research conducted concerning a possible reduction in the frequency of nitrogen application due to the sustained-release properties of zeolite. In this study, 157.5 kg ha-1 nitrogen in the form of urea fertilizer was applied at the same rate, either as a one-time application or as a 3-way split application with and without 10 t ha-1 zeolite. The effects on rice yield, nitrogen uptake, root morphology and soil properties were evaluated in 2014 and 2015. Results showed that zeolite could enhance the biomass, leaf area index and nitrogen uptake. A higher rice grain yield and nitrogen uptake following soil treatment with zeolite could be attributed to a higher soil cation exchange capacity as well as nitrogen and potassium availability in the soil especially during the vegetative period of the rice plant. The addition of nitrogen to the soil as a one-time application or 3-way split application with 10 t ha-1 zeolite significantly increased rice grain yield by 8.5 or 10.7% compared with nitrogen as a one-time application without zeolite. Zeolite addition greatly improved the development of root morphology and activity compared with treatments without zeolite, which contributed to additional plant growth. The addition of nitrogen to the soil with 10 t ha-1 zeolite as a one-time application that can significantly increase nutrient retention is recommended to improve rice grain yield and decrease nitrogen application frequencies in order to lower both labour forces and energy requirements.

Źródło:

International Agrophysics; 2019, 33, 2; 263-269
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Effect of Annealing Temperature and Ambient on Formation, Composition and Bandgap of $Cu_2ZnSnS_4$ Thin Films

Autorzy:

Sun, Y.
Yao, B.
Meng, X.
Wang, D.
Long, D.
Hua, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1205220.pdf

Data publikacji:

2014-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.55.-a

Opis:

Amorphous Cu-Zn-Sn-S precursor films were prepared by sol-gel and spin-coating with copper chloride, zinc chloride, tin chloride and thiourea solutions as starting materials. A $Cu_2ZnSnS_4$ film with kesterite structure and a small amount of chlorine formed when the precursor was annealed under Ar ambient at temperature above 200°C, but its atomic ratios of Cu:Zn:Sn:S far deviated from stoichiometric ratios of the $Cu_2ZnSnS_4$. However, when the precursor films were annealed with sulfur powder together at temperatures between 360 and 480°C, the CZTS film containing a very small amount of Cl formed, and its atomic ratio change little for Cu, Zn, and Sn, increases for S and decreases for Cl with increasing temperature. When the temperature is 480°C, a CZTS only has Cu, Zn, Sn, and S element is fabricated, and the atomic ratio of Cu:Zn:Sn:S is near the stoichiometric ratio. The bandgap of the CZTS decreases with increasing annealing temperature. The mechanisms of the formation and the properties of the CZTS are suggested in the present work.

Źródło:

Acta Physica Polonica A; 2014, 126, 3; 751-756
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

The Influence of Cycle Sputtering Deposition on the Properties of Cu₂ZnSnS₄ Thin Films

Autorzy:

Sun, Y.
Yao, B.
Long, D.
Meng, X.
Liu, L.
Hua, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1398930.pdf

Data publikacji:

2016-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.40.Fy

Opis:

Three kinds of precursor thin films with stacking orders of Cu/Sn/ZnS, Cu/Sn/ZnS/Cu/Sn/ZnS and Cu/Sn/ZnS/Cu/Sn/ZnS/Cu/Sn/ZnS were prepared by magnetron sputtering and annealed with sulfur powder. The microstructure, morphology and optical properties of thin films were investigated by X-ray diffraction, the Raman scattering, scanning electron microscopy and UV-visible spectrophotometer. The increase of cycle number decreases the sulfurizing temperature of the formation of Cu₂ZnSnS₄ phase. Chemical composition can be controlled by cycle sputtering deposition. After sulfurizing at 500°C, the particle size and the band gap increase with increasing cycle number.

Źródło:

Acta Physica Polonica A; 2016, 129, 6; 1169-1172
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Thermal Mechanical Stress Analysis of Ladle Lining with Integral Brick Joint

Autorzy:

Chang, W.
Li, G.
Kong, J.
Sun, Y.
Jiang, G.
Liu, H.

Powiązania:

https://bibliotekanauki.pl/articles/354915.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

ladle
heat transfer model
lining
expansion joint
thermal mechanical stress

Opis:

Based on the theory of heat transfer, the influence of expansion joints on the temperature and stress distribution of ladle lining is discussed. In view of the current expansion joint, the mathematical model of heat transfer and the three dimensional finite element model of ladle lining brick are established. By analyzing the temperature and stress distribution of ladle lining brick when the expansion joints are in different sizes, the thermal mechanical stress caused by the severe temperature difference can be reduced by the suitable expansion joint of the lining brick during the ladle baking and working process. The analysis results showed that the thermal mechanical stress which is caused by thermal expansion can be released through the 2 mm expansion joint, which is set in the building process. So we can effectively reduce the thermal mechanical stress of the ladle lining, and there is no risk of steel leakage, thus the service life of ladle can be effectively prolonged.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 2; 659-666
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Research on radiation characteristics of plasma Yagi antenna based on AIS base station in ships’ routeing waters

Autorzy:

Sun, Y.
Chen, Y.
Kong, F.
Wei, Y.
Zhan, F.
Zhao, J. S.

Powiązania:

https://bibliotekanauki.pl/articles/117021.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

radio navigation
radiation characteristics
plasma Yagi antenna
ships routeing
AIS base station
AIS based shipping routes
ships routeing waters
Automatic Identification System (AIS)

Opis:

A Yagi plasma antenna model was established by HFSS according to the relationship between plasma dielectric constant and electron density. The patterns were simulated by changing plasma parameters and the number of director dipoles. Results show that when the passive vibrators were switched off, the antenna is omnidirectional antenna. The directionality increases with the increase of the number of passive dipole and the main lobe of which narrows down. Then the plasma Yagi antenna model is established by plasma tube, the gain changed by changing the number of passive dipoles, so the plasma Yagi antenna has a very good reconfigurability. Results prove that the feasibility of the plasma Yagi antenna can be used on AIS base station of Ships’ Routeing waters. It can promote the communication and capability of maritime supervision in Ships’ Routeing waters.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 1; 179-184
2083-6473
2083-6481

Pojawia się w:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Fluorescence Analysis as an Effective Method Used in Micro/Trace Explosive Detection

Autorzy:

Liu, Y.
Shu, Y.
Liu, Xue-yong.
Xiong, Y.
Zhong, Fa-chun.
Sun, Y.

Powiązania:

https://bibliotekanauki.pl/articles/358808.pdf

Data publikacji:

2009

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

micro/trace explosive detection
fluorescence analysis
conjugated polymer
sensing materials

Opis:

There are many kinds of explosives, and their detection methods vary. Nitroaromatic compound is one of the composition of the explosives commonly used. The fuorescence will be quenched when they touch the fuorescent conjugated polymers. General methods for explosives detection have been summarized in this paper, in addition the application of novel fuorescence analysis technique in explosives detection has been introduced. Fluorescent conjugated polymer as chemical sensing material for explosive detection has been reviewed in detail, also a novel fuorescent sensing flm self-assembled by fuorescent small molecule pyrene and homogeneous fuoroimmunoassay have been presented briefy. The development of fuorescence analysis used in the area of determining explosives has been prospected.

Źródło:

Central European Journal of Energetic Materials; 2009, 6, 3-4; 303-311
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

A Visual Detection Method of Longitudinal Crack Based on Computer Image Processing During Slab Continuous Casting

Autorzy:

Liu, Y.
Wang, X.
Sun, Y.
Du, F.
Gao, Y.
Wang, F.
Wang, J.

Powiązania:

https://bibliotekanauki.pl/articles/351636.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

longitudinal crack
visual detection
image processing
continuous casting

Opis:

Based on the mould temperature measured by thermocouples during slab continuous casting, a difference of temperature thermograph is developed to detect slab cracks. In order to detect abnormal temperature region caused by longitudinal crack, the suspicious regions are extracted and divided by virtue of computer image processing algorithms, such as threshold segmentation, connected region judgement and boundary tracing. The abnormal regions are then determined and labeled with the eight connected component labeling algorithm. The boundary of abnormal region is also extracted to depict characteristics of longitudinal crack. Based on above researches, longitudinal crack with abnormal temperature region can be detected and is different from other abnormalities. Four samples of temperature drop are picked up to compare with longitudinal crack on the abnormal region formation, length, width, shape, et al. The results show that the abnormal region caused by longitudinal crack has a linear and vertical shape. The height of abnormal region is more than the width obviously. The ratio of height to width is usually larger than that of other temperature drop regions. This method provides a visual and easy way to detect longitudinal crack and other abnormities. Meanwhile it has a positive meaning to the intelligent and visual mould monitoring system of continuous casting.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 2; 673-680
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Review of the Photodecomposition of Some Important Energetic Materials

Autorzy:

Sun, Y.
Shu, Y.
Xu, T.
Shui, M.
Zhao, Z.
Gu, Y.
Wang, X.

Powiązania:

https://bibliotekanauki.pl/articles/358397.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

photodecomposition mechanisms
energetic materials

Opis:

The photodecomposition mechanisms of energetic materials vary with molecular structure, photodissociation wavelength, the phase of the material, experimental pressure and temperature etc. In this paper, the significant progress on photodecomposition studies of some important energetic materials achieved in recent years is introduced in detail, including nitromethane, DMNA (dimethylnitramine), TATB (1,3,5-triamino-2,4,6-trinitrobenzene), RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), HMX (1,3,5,7-tetranitro-1,3,5,7- tetrazacycloctane) and CL-20 (2,4,6,8,10,12-hexanitrohexaazaisowurtzitane). The difficulties and prospects of photodecomposition research of energetic materials are also indicated.

Źródło:

Central European Journal of Energetic Materials; 2012, 9, 4; 411-423
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Shear properties of a honeycomb structure with zero Poisson’s ratio

Autorzy:

Song, L.
Sun, Y.
Han, Z.
Wang, T.
Wang, H.
Yin, C.
Shen, X.

Powiązania:

https://bibliotekanauki.pl/articles/38697109.pdf

Data publikacji:

2023

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

honeycomb structure
zero Poisson’s ratio
shear properties
small deformation
large deformation

Opis:

Honeycomb structures with zero Poisson’s ratio show promising potential for application in variable-sweep wing aircraft. The shear properties of these honeycomb structures serve as a crucial indicator of their morphing capacity. This paper derives the linear and non-linear shear properties of a honeycomb structure with zero Poisson’s ratio. A modified factor is introduced to establish a relationship between the linear and non-linear shear modulus of the honeycomb structure, simplifying the calculation method of the non-linear shear modulus. The validity of theoretical predictions is then confirmed using the finite element method Furthermore, the influences of the geometric parameters on the shear properties of the honeycomb structure with zero Poisson’s ratio are investigated, highlighting the varying contributions of these cell geometric parameters to the shear properties.

Źródło:

Archives of Mechanics; 2023, 75, 5; 521-541
0373-2029

Pojawia się w:

Archives of Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

The kinetics of 1,1-dichloroethene (CCl2=CH2) and trichloroethene (HClC=CCl2) decomposition in dry and humid air under the influence of electron beam

Autorzy:

Nichipor, H.
Dashouk, E.
Yacko, S.
Chmielewski, A.
Zimek, Z.
Sun, Y.
Vitale, S.

Powiązania:

https://bibliotekanauki.pl/articles/148600.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

1,1-dichloroethene
trichloroethene
electron beam decomposition
theoretical model
kinetics calculation

Opis:

New experimental data related to the removal of C2H2Cl2 and C2HCl3 in dry and humid (300 ppm of H2O) air at atmospheric pressure and a temperature of 25°C under the influence of electron beam in the dose range 1 < D < 100 kGy are published. Taking into account these experimental data, theoretical models of the decomposition of both compounds and computer simulations were performed by the present authors to find the kinetics of such processes. The influence of active atoms Cl, O and OH radicals on the VOC degradation process has been established. The theoretical model of C2H2Cl2 degradation under the influence of electron beam in dry and humid air describes the C2H2Cl2 decay and formation of the main products like Cl2, COCl2, CO, CO2, HCl, HCOCl and C2H2Cl2O. The results of calculation of the kinetics of C2H2Cl2 decomposition were compared with data obtained experimentally for the C2H2Cl2 concentration range 321-2213 ppm. It was established that the relation between the rate constants of intermediate product decomposition: C2H2Cl3O Ţ C2H2Cl2O + Cl; (k1) C2H2Cl3O Ţ COCl2 + CH2C2; (k2) should be k1/k2 = 40. The theoretical model of C2HCl3 degradation under the influence of electron beam in dry and humid air describes the C2HCl3 decay and formation of the main products like Cl2, COCl2, CO, CO2, HCl, HCOCl and C2HCl3O. A detailed comparison of experimental and theoretical data for the C2HCl3 concentration 108-3206 ppm shows that the relation between the rate constants of intermediate product decomposition: C2HCl4O Ţ C2HCl3O + Cl; (k3) C2HCl4O Ţ COCl2 + CHCl2; (k4) should be k3/k4 =10. It was also found that O2+ ions have been formed in a gas mixture as a result of charge transfer process from N2+ ions, partly in excited form, which may lead to charge transfer to C2HCl3 and degradation of those particles. According to performed calculation, it can be stated that in humid air (300 ppm of H2O) VOC degradation is occurring mainly due to a chain reaction stimulated by Cl atoms, but also OH radicals are playing an important role. In the described gas mixture, the OH radicals are formed in the following reactions: O2+) + H2O + M Ţ (O2+)H2O + M O2+ (H2O) + H2O Ţ O2 + (H3O+)OH (H3O+)OH + H2O Ţ H3O+ + OH + H2O VOC degradation process under the influence of electron beam is more effective in humid air than in dry air for the same initial VOC concentration level. This conclusion is also supported by experimental data. --------------------------------------------------------------------------------

Źródło:

Nukleonika; 2003, 48, 1; 45-50
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Crystallization Process of $Fe_{75}Co_5Zr_{10}B_{10}$ Amorphous Alloy

Autorzy:

Sun, Y.
Zuo, B.
Wang, D.
Meng, X.
Liu, J.
Wang, L.
Hua, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1399278.pdf

Data publikacji:

2013-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.43.Dq
64.60.My

Opis:

$Fe_{75}Co_5Zr_{10}B_{10}$ amorphous alloy prepared by melt-spinning was annealed at various temperatures. The thermal property and microstructures were investigated by differential thermal analysis, X-ray diffraction, and transmission electron microscopy. The crystallization process of $Fe_{75}Co_5Zr_{10}B_{10}$ amorphous alloy is complex. The α-Fe phase precipitates from the amorphous matrix in the initial stage of crystallization. The α-Mn type (χ) phase precipitates at 570°C, but transforms to α-Fe phase and the Laves C14(λ) phase at higher temperature. In the final stage of crystallization, $Fe_3Zr$, $Fe_2Zr$, and unknown phases are observed and the λ-phase disappears. The α-Fe phase preferentially nucleates after annealing at 530C for 10 min and the χ-phase preferentially nucleates after annealing at 600C for 10 min. The nucleation barrier of χ-phase is larger than that of α-Fe phase. The local structure of χ-phase is more similar to amorphous phase.

Źródło:

Acta Physica Polonica A; 2013, 124, 4; 685-687
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

The study on bactericidal effect and ultrastructural alterations of chlorocresol nanoemulsion disinfectant against Staphylococcus aureus

Autorzy:

Zhang, Y.F.
Sun, Y.W.
Liu, X.H.
An, Z.X.
Yang, X.F.

Powiązania:

https://bibliotekanauki.pl/articles/16647452.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

chlorocresol
nanoemulsion
disinfectant
Staphylococcus aureus
bactericidal effect
ultrastructure

Opis:

Chlorocresol nanoemulsion disinfectant (CND) is an environmental disinfectant prepared with nanoemulsion as its drug carrier. This study aimed to investigate the bactericidal effect of CND on Staphylococcus aureus ( S. aureus) and its effect on bacterial ultrastructure. The neutralizing effect of CND against S. aureus was first screened by suspension quantitative evaluation experiment procedure of neutralizer. Disinfection performance was evaluated by the determination of Minimal Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC), quantitative bactericidal experiment, and comparative experiment of disinfection performance between 0.1% CND and 0.1% chlorocresol aqueous solution. Meanwhile, the effect of CND on the ultrastructure of S. aureus was investigated with scanning electron microscope (SEM) and transmission electron microscope (TEM) to preliminarily explore the bactericidal mechanism. The results showed that 3% Tween-80 in PBS could be screened as the neutralizer of CND against S. aureus. MIC and MBC were 100 μg/mL and 200 μg/mL, respectively. The bactericidal rates were all 100% when 0.06% and 0.08% disinfectant acted for 15 and 5 min, respectively. Furthermore, compared with 0.1% chlorocresol aqueous solution, the bactericidal effect of 0.1% CND was significantly enhanced (p<0.01). After treatment with CND for 10 min, SEM observation showed that the morphology of S. aureus cells were changed and the integrity destroyed. TEM observation showed that the cell shape changed, and the structures of the cell wall, cell membrane and cytoplasm were damaged in varying degrees. CND showed the strong bactericidal effect on S. aureus and could cause ultrastructure alterations of S. aureus.

Źródło:

Polish Journal of Veterinary Sciences; 2023, 26, 1; 13-20
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Control system design for multi-rotor MAV

Autorzy:

Wang, W.
Ma, H.
Sun, C.-Y.

Powiązania:

https://bibliotekanauki.pl/articles/280407.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

MAV
attitude control
altitude control
LQG
memory based control

Opis:

Abstract MAVs (Micro Air Vehicles) have attracted more and more attention in recent years because of their wide applications, such as investigations of inhospitable environment, nuclear or hazardous material polluted regions and other inaccessible areas. In this paper, both attitude and altitude controls of a Quad-Rotor type MAV are discussed and analyzed. To stabilize the attitude, one order memory based controller is selected, the performance of which is independent of the detail model information, leading to enhanced robustness. While for the altitude, a Linear Quadratic Gaussian (LQG) controller is proposed. The experimental results of the real flight demonstrate the stability and robustness of the controllers.

Źródło:

Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 1027-1038
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

New information on sexual dimorphism and allometric growth in Keichousaurus hui, a pachypleurosaur from the Middle Triassic of Guizhou, South China

Autorzy:

Xue, Y.
Jiang, D.
Motani, R.
Rieppel, O.
Sun, Y.
Sun, Z.
Ji, C.
Yang, P.

Powiązania:

https://bibliotekanauki.pl/articles/19926.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Opis:

Keichousaurus hui is a small pachypleurosaur (Reptilia: Sauropterygia) from the Triassic of China. Many specimens of various growth stages are known, making them ideal for ontogenetic research. We report 22 new specimens from the Middle Triassic of Xingyi (Guizhou, south China), and combined their skeletal measurements with those from 85 published specimens to analyze the ontogenetic trajectory of sexual dimorphism. An Exploratory Factor Analysis suggests that the largest factors behind morphological disparity within the species are body size followed by gender. Sexual dimorphism is most clearly reflected in selected skeletal ratios that are more pronounced in males than in females. We found that the relative length of femur to body size was useful in gender identification, in addition to three ratios that are traditionally used, namely a distal expansion of the humerus relative to its shaft, humerus length relative to body size, and humerus length relative to femur length. Two distinctive patterns exist in allometric changes of these four ratios. The distal expansion of the humerus is exceptional in that it is equally pronounced in juvenile and adult males and therefore must have been fully established during embryonic growth. The other three features are not pronounced at birth size and subsequently become pronounced during postembryonic growth. However, males and females already show different growth trajectories at birth size even in these three. Therefore, the fate of sexually dimorphic features seems to have already been set during embryonic growth in K. hui.

Źródło:

Acta Palaeontologica Polonica; 2015, 60, 3
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

pUC18-CpG stimulates RAW 264.7 via TBK1-mediated pathway and presents adjuvanticity in mice

Autorzy:

Wu, J.
Chen, Q.
Xin, T.
Sun, Y.
Jia, H.
Hou, S.H.
Guo, X.Y.

Powiązania:

https://bibliotekanauki.pl/articles/2087554.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

adjuvant
CpG DNA
Echinococcus granulosus
TBK1
type I interferons

Źródło:

Polish Journal of Veterinary Sciences; 2019, 2; 195-201
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Development of a 20 kJ Sparker for High Resolution Ocean Seismic Survey

Autorzy:

Sun, Y.
Gao, Y.
Yan, P.
Wang, J.
Yuan, W.
Wu, H.
Wang, Y.
Wan, P.
Zhao, G.

Powiązania:

https://bibliotekanauki.pl/articles/1807914.pdf

Data publikacji:

2009-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

52.80.Wq
43.30.+m

Opis:

An ocean sparker with a stored energy of 20 kJ was developed for high resolution ocean seismic survey. The sparker is mainly composed of a high voltage high frequency charging supply, energy storage capacitors, a discharging switch and discharging electrodes. The H-bridge inverter and series resonant mode were adopted in the charging supply, and a dry high voltage transformer was used to improve the safety and maintenance, the average charging rate exceeded 4 kJ/s. An optical fiber connected between the high voltage system and the control system was used to isolate high voltage and transmit the high voltage signal. The high voltage electrodes of the discharging electrodes consisted of several hundreds of electrodes. The experimental results show that the sparker can be operated at repetition rates of 12 shots/min, and can meet the expected design requirements. Further field tests will be done in the near future.

Źródło:

Acta Physica Polonica A; 2009, 115, 6; 1059-1061
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Magnolol inhibits Streptococcus suis-induced inflammation and ROS formation via TLR2/MAPK/NF-κB signaling in RAW264.7 cells

Autorzy:

Wang, J.
Sun, Y.
Zhang, L.
Xu, W.
You, J.
Lu, H.
Song, Y.
Wei, J.
Li, L.

Powiązania:

https://bibliotekanauki.pl/articles/2087779.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

magnolol
Streptococcus suis
Toll-like receptor2
mitogen-activated protein kinase
nuclear factor Kappa B

Źródło:

Polish Journal of Veterinary Sciences; 2018, 21, 1; 111-118
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Electron Transport and Microwave Noise in MBE- and MOCVD-Grown AlGaN/AlN/GaN

Autorzy:

Matulionis, A.
Liberis, J.
Eastman, L. F.
Schaff, W. J.
Shealy, J. R.
Chen, X.
Sun, Y. J.

Powiązania:

https://bibliotekanauki.pl/articles/2041771.pdf

Data publikacji:

2005-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

63.20.Kr
72.20.Ht
73.40.Kp

Opis:

Microwave noise temperature, current, and dissipated power were investigated at room temperature in undoped AlGaN/AlN/GaN channels grown by molecular beam epitaxy and metal-organic compound vapour decomposition techniques. Samples with essentially the same electron density (1×10$\text{}^{13}$ cm$\text{}^{-2}$) and low-field mobility (1150 cm$\text{}^{2}$/(V s)) demonstrated considerably different behaviour at high electric fields. The effective hot-phonon lifetime, 300 fs and 1000 fs, respectively, was estimated for molecular beam epitaxy and metal-organic compound vapour decomposition samples. The expected anti-correlation of hot-phonon lifetime and hot-electron drift velocity was confirmed experimentally.

Źródło:

Acta Physica Polonica A; 2005, 107, 2; 361-364
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

High Concentration of Arsenic Removal from Acid Leaching Solution of Zinc Oxide Dust by Water-Quenched Slag

Autorzy:

Sun, H. Y.
Sen, W.
Kong, X.
Liu, G. Y.

Powiązania:

https://bibliotekanauki.pl/articles/356676.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

arsenic removal
water-quenched slag
zinc oxide dust
purification

Opis:

The present work provides a study on high concentration of arsenic removal from acid leaching solution of zinc oxide dust by water-quenched slag. The water-quenched slag is a waste slag produced from fuming furnace of lead pyrometallurgical process and used as a substitute of ferrous sulfate heptahydrate to precipitate arsenic at purification section. The effects of reaction temperature, reaction time, the addition of H₂O₂ and the addition of water-quenched slag on arsenic removal rate were systematically investigated. The reaction temperature of 70°C, reaction time of 1h, H₂O₂ addition of 10.8 mL/L and water-quenched slag addition of 17.8 g/L are identified as the best technical parameters. At the optimum conditions, the arsenic (III) with high concentration (As 4.13 g/L) is efficiently removed (arsenic removal rate > 99%). The filtrate (Fe 1.21 mg/L, As 1.53 mg/L) with low concentrations of arsenic and iron and the stable filter residue are also obtained successfully. The United States EPA Toxicity Characteristic Leaching Procedure (TCLP) test shows that the As leachability never exceeds the regulatory limit of 5 mg/L As. The results suggest that the water-quenched slag shows potential for removing high concentration of arsenic from acid leaching solution of zinc oxide dust.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 1; 425-430
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Catalytic oxidation of lignin to aromatics over salen-porphyrin complex as a biomimetic catalyst

Autorzy:

Lu, X.-J.
Zhou, X.-F.
Zhu, Z.-L.
Sun, Y.
Tang, K.
Lei, F.-H.
Liu, Z.-G.
Wang, T.

Powiązania:

https://bibliotekanauki.pl/articles/52771.pdf

Data publikacji:

2019

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna

Źródło:

Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2019, 62, 203
1644-3985

Pojawia się w:

Drewno. Prace Naukowe. Doniesienia. Komunikaty

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Selection of reference genes for quantitative real-time RT-PCR on gene expression in Golden Pompano (Trachinotus ovatus)

Autorzy:

Chen, X.J.
Sun, Y.
Zhang, X.Q.
Huang, S.
Cao, Z.J.
Qin, Q.W.
Hu, W.T.
Zhou, Y.C.

Powiązania:

https://bibliotekanauki.pl/articles/2087908.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Źródło:

Polish Journal of Veterinary Sciences; 2017, 3; 583-594
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Differential expression of Toll - like receptor 4 signaling pathway genes in Escherichia coli F18 - resistant and - sensitive Meishan piglets

Autorzy:

Liu, Y.
Gan, L.N.
Qin, W.Y.
Sun, S.Y.
Zhu, G.Q.
Wu, S.L.
Bao, W.B.

Powiązania:

https://bibliotekanauki.pl/articles/31946.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Opis:

The Toll-like receptor 4 (TLR4) signaling pathway is an important inflammatory pathways associated with the progression of numerous diseases. The aim of the present study was to investigate the relationship between TLR4 signaling and resistance to Escherichia coli F18 in locally weaned Meishan piglets. Using a real-time PCR approach, expression profiles were determined for key TLR4 signaling pathway genes TLR4, MyD88, CD14, IFN-α, IL-1β and TNF-α in the spleen, thymus, lymph nodes, duodenum and jejunum of E. coli F18-resistant and -sensitive animals. TLR4 signaling pathway genes were expressed in all the immune organs and intestinal tissues, and the expression was generally higher in the spleen and lymph nodes. TLR4 transcription was higher in the spleen of sensitive piglets (p<0.05), but there was no significant difference in TLR4 mRNA levels in other tissues. Similarly, CD14 transcription was higher in lymph nodes of sensitive animals (p<0.05) but not in other tissues. IL-1β expression was higher in the spleen and in the duodenum of resistant piglets (p<0.05, p<0.01, respectively), and there were no significant differences in other tissues. There were also no significant differences in the expression of MyD88, TNF-α and IFN-α between sensitive and resistant piglets (p>0.05). These results further confirm the involvement of the TLR4 signaling pathway in resistance to E. coli F18 in Meishan weaned piglets. The resistance appeared to be mediated via downregulation of TLR4 and CD14, and upregulation of MyD88 that may promote the release of cytokines TNF-α, IL-1β, IFN-α and other inflammatory mediators which help to fight against E. coli F18 infection.

Źródło:

Polish Journal of Veterinary Sciences; 2016, 19, 2
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Preparation and Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Polypropylene Grafting Maleic Anhydride Two-Component Materials
Przygotowanie i właściwości materiałów dwuskładnikowych z poli (3-hydroksymaślanuco-3-hydroksywalerianianu) i polipropylenu szczepionych bezwodnikiem maleinowym

Autorzy:

Sun, X.
Ge, Y.

Powiązania:

https://bibliotekanauki.pl/articles/232648.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

PHBV
PP-g-MAH
crystallisation property
thermal property
rheology
krystalizacja
własność cieplna
reologia

Opis:

In order to provide a theoretical basis for the preparation and spinnability of two-component materials, poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV) and polypropylene grafting maleic anhydride (PP-g-MAH) blends were prepared by melt mixing with different ratios (100/0, 75/25, 50/50, 25/75, 0/100). Properties of the blends system were investigated by means of a mixed rheometer, scanning electron microscope, simultaneous thermal analyser, differential scanning calorimetry and X-ray diffraction. The results demonstrate that PHBV/PP-g-MAH blends exhibit different morphology of the sea-island with a change in the mix ratio. The initial thermal decomposition temperature of PHBV in the blending system is over 250 °C, which means the thermal stability of PHBV is markedly improved. The crystallisation of PHBV varied according to the blending process parameter. When the cooling velocity increases, the crystallisation peak becomes wide, the temperature of crystallisation decreases, and the crystallisation temperature of PHBV increases significantly. PHBV has a high sensitivity to variation in the shear rate, and PHBV/PP-g-MAH blends have the mixing characteristic of shear thinned liquid. There is no diffraction peak at 2θ = 22.8°, and this result certifies that PP-g-MAH changes the crystal form of PHBV. and that PP-g-MAH addition is beneficial to the spinnability of PHBV. Results show that the interplay between PHBV and PP-g-MAH is of great significance and universal for both plastics and fibres.
Celem pracy było zapewnienia teoretycznych podstaw przygotowania i przędzenia materiałów dwuskładnikowych z mieszaniny poli (3-hydroksymaślan-co-3-hydroksywalerianian) (PHBV) i polipropylenu przy użyciu szczepów bezwodnika maleinowego (PP-g-MAH). Przygotowano mieszanki o różnych stosunkach: 100/0, 75/25, 50/50, 25/75, 0/100. Właściwości układu mieszanin badano za pomocą reometru, skaningowego mikroskopu elektronowego, analizatora termicznego, różnicowej kalorymetrii skaningowej i dyfrakcji rentgenowskiej. Wyniki wykazały, że mieszanki PHBV/PP-g-MAH wykazują różną morfologię typu „wyspa morska” wraz ze zmianą proporcji mieszania. Początkowa temperatura rozkładu termicznego PHBV w układzie mieszania wynosiła ponad 250 °C, co oznacza, że stabilność termiczna PHBV została znacznie poprawiona. Krystalizacja PHBV zmieniała się zgodnie z parametrem procesu mieszania. Gdy prędkość chłodzenia wzrastała, pik krystalizacji stawał się szeroki, temperatura krystalizacji zmniejszałą się, a temperatura krystalizacji PHBV znacząco wzrastała. PHBV ma wysoką czułość na zmienność szybkości ścinania, a mieszanki PHBV/PP-g-MAH mają charakterystykę mieszania ścinanej cieczy. Nie wykryto piku dyfrakcyjnego przy 2θ = 22,8°, co poświadcza, że PP-g-MAH zmienia postać krystaliczną PHBV i że dodatek PP-g-MAH jest korzystny dla zdolności przędzenia PHBV. Wyniki pokazują, że wzajemne oddziaływanie pomiędzy PHBV i PP-g-MAH ma ogromne znaczenie i jest uniwersalne zarówno dla tworzyw sztucznych, jak i włókien.

Źródło:

Fibres & Textiles in Eastern Europe; 2018, 3 (129); 17-22
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Influence of surface plasmon wave interference on near-field imaging on metal nanostructures with apertured probe

Autorzy:

Yang, Y.
Sun, Z.

Powiązania:

https://bibliotekanauki.pl/articles/173847.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

near-field
surface plasmon
metal
nanostructure

Opis:

We numerically studied artifact issues on near-field imaging of field intensity on metal nanostruc-tures (isolated ridges and slits in a continuous film) with an apertured probe. It is shown for the latter case that the interaction between neighboring slits via propagating surface plasmon waves (e.g., surface plasmon wave interferences) makes the probe-imaged field intensity highly condi-tional in reflection of the unperturbed field. As surface plasmon behaviors and probe imaging processes are polarization-sensitive and the field components are correlated, a model analysis of the partial field components elucidates their relations, which can help to derive the unperturbed near-field image from the probed one.

Źródło:

Optica Applicata; 2013, 43, 3; 615-626
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Persistent bounded disturbance rejection for uncertain time-delay systems

Autorzy:

Sun, M.
Jia, Y.

Powiązania:

https://bibliotekanauki.pl/articles/969712.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

persistent disturbance
time-delay system
linear matrix inequality (LMI)
robust control

Opis:

This paper considers the problem of persistent bounded disturbance rejection for a class of time-delay systems with parametric uncertainty by Lyapunov function and positively invariant set analysis method. Sufficient conditions for internal stability and L1-performance analysis are given in terms of linear matrix inequalities (LMIs). Based on the results, a simple approach to the design of a linear state-feedback controller is presented to stabilize robustly the uncertain time-delay systems and achieve a desired level of disturbance attenuation. All the obtained conditions are delay-dependent. A numerical example is included to illustrate the proposed method.

Źródło:

Control and Cybernetics; 2009, 38, 3; 593-607
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Ecological Compensation Standard for Non-point Pollution from Farmland
Propozycja standardu ekologicznej kompensacji dla obszarowych zanieczyszczeń z rolnictwa

Autorzy:

Zhang, Y.
Ji, Y.
Zhou, Y.
Sun, H.

Powiązania:

https://bibliotekanauki.pl/articles/371753.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN

Tematy:

ecological compensation standard
nitrogen
non-point pollution
optimal ecological economic nitrogen application amount
standard kompensacji ekologicznej
azot
obszarowe źródła zanieczyszczeń
optymalna ekologicznie ilość stosowanego azotu

Opis:

Non-point source water pollution mainly comes from farmland chemical fertilizers which has become an obstacle of agricultural sustainability and ecological health. As a public policy tool for assessing global ecological crisis and environmental pollution, ecological compensation is important for regional agricultural sustainability. Ecological compensation that farmers receive from governments is based on their reduction of fertilizer application at optimal ecological and economic levels. In this study we estimated the ecological compensation standards for nitrogen non-point pollution in Yixng city with contingent valuation method and cost-benefit method. Results showed that the range of theoretical values of ecological compensation of nitrogen in Yixing City depended upon its optimal ecological and economic nitrogen application levels. The willingness of farmers to accept the compensation was positively correlated with their farming experience and education. There were about half of farmers willing to accept the compensation. Based on the present study, we found Yixing’s ecological compensation standard for controlling nitrogen non-point pollution was 620.0 yuan/hm2 at the current economic development level.
Obszarowe zanieczyszczeń wód z rolnictwa pochodzą ze stosowania nawozów sztucznych, stanowiących prze-szkodę na drodze do osiągnięcia rolniczej zrównoważoności i równowagi ekologicznej. W tym kontekście ekologiczna kompensacja, stanowiąca narzędzie polityczne do oceny kryzysu ekologicznego i ogólnego poziomu zanieczyszczenia środowiska, okazuje się także ważna w wymiarze lokalnej zrównoważoności rolniczej. Wysokość świadczeń, które rolniczy dostają od władz, jest uwarunkowana poziomem redukcji stosowania nawozów, którego celem jest osiągnięcie poziomu optymalnego zarówno zer strony ekologicznej, jak i ekonomicznej. W tym artykule, przy pomocy Metoda wyceny warunkowej i metody kosztów i korzyści, ustaliliśmy standardy ekologicznej kompensacji dla miasta Yixng. Otrzymane rezultaty pozwalają na stwierdzenie, że zakres teoretycznych wartości ekologicznej kompensacji dla azotu w Yixing zależy od ustalenia optymalnych ekologicznych i ekonomicznych pozimów stosowania azotu. Zainteresowanie rolników otrzymaniem odszkodowania okazało się być pozytywnie skorelowane z ich doświadczeniem rolniczym i poziomem wykształcenia. Chęć jego otrzymania zgłosiła połowa z nich. Ustaliliśmy ponadto, że standard ekologicznej kompensacji dla Yixing odnoszący się kontrolowania ob-szarowych zanieczyszczeń związanych z nawozami azotowymi wynosi 620.0 yuan/hm2 , przy założeniu obecnego poziomu rozwoju ekonomicznego.

Źródło:

Problemy Ekorozwoju; 2017, 12, 1; 139-146
1895-6912

Pojawia się w:

Problemy Ekorozwoju

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Pleistocene Equid Brain Endocast from Shanxi Province, China

Autorzy:

Hu, Y.
Chen, Y.
Wang, S.
Sun, Q.

Powiązania:

https://bibliotekanauki.pl/articles/946031.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

mammalia
equus
equid brain
pleistocene
shanxi province
china

Opis:

Brain endocasts are rare in the fossil record because they are only preserved under exceptional conditions. An equid brain endocast from the early Pleistocene of Wanrong County, Shanxi Province, China, is reported in this paper. Measuring approximately 140 × 95.2 × 83 mm, the new specimen represents a relatively advanced adult horse brain. Comparisons indicate that it is more derived than those of Hyracotherium and Mesohippus in having an expanded neocortex, and more than those of Pliohippus and Hipparion in having an enlarged network of branching sulci; in most characters involving these sulci, the Shanxi brain conforms to the extant species Equus caballus. The sulcus diagonalis of the Equus brain appears to have evolved conservatively during the early Pleistocene, whereas the sulcus suprasylvius seems to have evolved rapidly. The specimen demonstrates that the development of a high degree of complexity predates the enlargement of the brain in the horse, which increased in length, breadth, and especially height during the late Cenozoic.

Źródło:

Acta Palaeontologica Polonica; 2014, 59, 2; 253-258
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

A Signal Subspace Speech Enhancement Approach Based on Joint Low-Rank and Sparse Matrix Decomposition

Autorzy:

Sun, C.
Xie, J.
Leng, Y.

Powiązania:

https://bibliotekanauki.pl/articles/177990.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

subspace speech enhancement
singular value decomposition
joint low-rank and sparse matrix decomposition

Opis:

Subspace-based methods have been effectively used to estimate enhanced speech from noisy speech samples. In the traditional subspace approaches, a critical step is splitting of two invariant subspaces associated with signal and noise via subspace decomposition, which is often performed by singular-value decomposition or eigenvalue decomposition. However, these decomposition algorithms are highly sensitive to the presence of large corruptions, resulting in a large amount of residual noise within enhanced speech in low signal-to-noise ratio (SNR) situations. In this paper, a joint low-rank and sparse matrix decomposition (JLSMD) based subspace method is proposed for speech enhancement. In the proposed method, we firstly structure the corrupted data as a Toeplitz matrix and estimate its effective rank value for the underlying clean speech matrix. Then the subspace decomposition is performed by means of JLSMD, where the decomposed low-rank part corresponds to enhanced speech and the sparse part corresponds to noise signal, respectively. An extensive set of experiments have been carried out for both of white Gaussian noise and real-world noise. Experimental results show that the proposed method performs better than conventional methods in many types of strong noise conditions, in terms of yielding less residual noise and lower speech distortion.

Źródło:

Archives of Acoustics; 2016, 41, 2; 245-254
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Implication and collecting mechanism of emulsified sodium vegetable oleate on fluorite flotation

Autorzy:

Sun, L.
Liu, J.
Liao, Y.

Powiązania:

https://bibliotekanauki.pl/articles/109761.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

emulsified sodium vegetable oleate
collector
fluorite flotation
sodium oleate

Opis:

The emulsified sodium vegetable oleate (ESVO) was prepared with low-cost vegetable oleate. Using ESVO as a collector, the flotation performance of fluorite had been investigated comparing with sodium oleate at a temperature of 20 ± 2 °C. The results of flotation showed that ESVO had better collecting performance than the sodium oleate. The interaction mechanism of these two collectors with fluorite was studied by the zeta potential, FTIR spectra and laser grain-size tests. Both ESVO and sodium oleate changed fluorite zeta potential by electrostatic attraction and chemical adsorption, and generated calcium carboxylate on the fluorite surface. Moreover, it was concluded that higher fluorite recovery was a consequence of ESVO smaller surface tension comparing to sodium oleate.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 2; 211-219
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 65.

Tytuł:

Heating control of heated twin radiosonde humidity sensor based on DMC

Autorzy:

Sun, N.
Zhang, Y.
Zhang, W
Cheng, E.
Liu, Y.

Powiązania:

https://bibliotekanauki.pl/articles/260018.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

DMC
twin heated humidity sensor
expanded responsible curve
heating control

Opis:

In order to effectively solve condensation and icing problems of radiosonde in low-temperature environment at high altitude, humidity sensor heated automatic alternately to remove pollution and improve the measurement accuracy. Heat experiments obtained the curve of rising temperature and responsible time on heated twin humidity sensor in normal temperature and pressure, by expanded responsible curve to obtain heated model of twin heated humidity sensor and by the analysis of heating model, use DMC and PID control for heating respectively. Simulation results show that the DMC control meets the practical requirements of measure at high altitude.

Źródło:

Polish Maritime Research; 2016, S 1; 52-58
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Adsorption behaviors of typical aromatic pollutants in biologically treated coking wastewater on powdered coal

Autorzy:

Sun, H.
Wang, Y.
Bian, Y.
He, X.
Li, G.

Powiązania:

https://bibliotekanauki.pl/articles/110777.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

aromatic pollutants
wastewater treatment
adsorption affinity
competitive adsorption

Opis:

The raw coal was utilized as adsorbent based on its remarkable adsorption ability of coal slime to organic compounds in the flotation process. This paper mainly investigates adsorption behaviors of benzpyrole (BZP), pyrrole (PR) and benzoic acid (BA) on powdered coal (PC). In the monocomponent solution, the removal efficiencies of BZP, PR and BA reached 85.23%, 55.02% and 24.84% at PC dosage of 20 g/dm3. Adsorption behaviors of three pollutants fitted perfectly to the pseudo-second order kinetics model and liquid film diffusion occupied the largest proportion in rate-limiting step according to the diffusion rates. Furthermore, the influences of pH on adsorption behaviors and competitive adsorption mechanism of three pollutants were also reported.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 2; 496-504
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Reverse flotation of ultrafine magnetic concentrate by using mixed anionic/cationic collectors

Autorzy:

Lu, D.
Hu, Y.
Li, Y.
Jiang, T.
Sun, W.
Wang, Y.

Powiązania:

https://bibliotekanauki.pl/articles/110550.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ultrafine magnetite
collector mixture
reverse flotation
closed flotation

Opis:

Compared to reverse cationic flotation, the advantages of reverse anionic flotation include relatively lower sensitivity to slimes and lower reagent cost. Besides, anionic collectors were found to have excellent capability of selectively separating an ultrafine magnetite ore. Addition of a small amount of cationic collector into the anionic collector as the collector mixture can improve the metallurgical results of removing silicates in reverse flotation. In this paper, NaOL and DDA were used for reverse flotation of the ultrafine magnetic concentrate. The separation performance of the collector mixture was investigated at different ratios of NaOL and DDA. The results showed that a better separation performance was obtained for the collector mixture than for NaOL alone. There was an optimal molar ratio between NaOL and DDA equal to 10:1. In the flotation system with the presence of the collector mixture, the good selectivity was found when starch was used as a depressor for magnetite and CaO was used as an activator for quartz. The influences of starch and CaO dosages on the separation performance of magnetite, quartz and chlorite had been investigated through micro-flotation tests. The infrared spectral analysis showed stretching vibration peaks of chemical adsorption of the collector mixture on the magnetite surface. The peaks were not present when starch was used as the depressor for magnetite. The closed flotation tests on the magnetic concentrate with the particle size of -25 μm were performed in the laboratory. The Fe concentrate assaying 64.52 % was obtained with Fe recovery of 80.66%, for the Fe content of feed equal to 52.98%.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 724-736
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Analysis on electromechanical coupling vibration characteristics of in-wheel motor in electric vehicles considering air gap eccentricity

Autorzy:

Li, Y.
Wu, H.
Xu, X.
Cai, Y.
Sun, X.

Powiązania:

https://bibliotekanauki.pl/articles/200165.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

BLDC in-wheel motor
rotor eccentricity
unbalanced magnetic force
electric vehicle
electromechanical coupling vibrat

Opis:

The distortion of air gap magnetic field caused by the rotor eccentricity contributes to the electromechanical coupling vibration of the brushless DC (BLDC) permanent magnet in-wheel motor (PMIWM) in electric vehicles (EV). The comfort of the BLDC in-wheel motor drive (IWMD) EV is seriously affected. To deeply investigate the electromechanical coupling vibration of the PMIWM under air gap eccentricity, the PMIWM, tyre and road excitation are analyzed first. The influence of air gap eccentricity on air gap magnetic density is investigated. The coupling law of the air gap and the unbalanced magnetic force (UMF) is studied. The coupling characteristics of eccentricity rate, air gap magnetic density, UMF, phase current and vibration acceleration are verified on the test bench in the laboratory. The mechanism of the electro-mechanical coupling vibration of the BLDC PMIWM under air gap static eccentricity (SE), dynamic eccentricity (DE) and hybrid eccentricity (HE) is revealed. DE and HE deteriorate the vibration acceleration amplitude, which contributes the electromechanical coupling vibration of the PMIWM. The research results provide a solid foundation for the vibration and noise suppression of the PMIWM in distributed drive EV.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 851-862
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Study on pre-concentration efficiency of wolframite from tungsten ore using gravity and magnetic separations

Autorzy:

Lu, D.
Wang, Y.
Jiang, T.
Sun, W.
Hu, Y.

Powiązania:

https://bibliotekanauki.pl/articles/109597.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

tungsten ore
pre-concentration
separation efficiency
gravity separation
magnetic separation

Opis:

Pre-concentration is effectively applied in recovering wolframite from tungsten ore, due to its benefits of further upgrading tungsten ore and improving separation efficiency. The most important pre-concentration techniques for tungsten ore include gravity separation and magnetic separation, based on the fact that there are appreciable differences, between the desired wolframite and the gangue minerals, in density and magnetic susceptibility. This study investigated the separation efficiency of gravity pre-concentration (Falcon Concentrator) and high-gradient magnetic pre-concentration (SLon VPHGMS) for the beneficiation of a Canada tungsten ore. It is a low-grade type of ore with high silica and arsenic content, and an average content of WO3 is about 0.45%. The optimum conditions for different operational parameters of two pre-concentration separators were studied on this low-grade material. The results presented in this paper suggested that although both pre-concentration techniques were effective for producing pre-concentrates containing high WO3, magnetic pre-concentration showed significantly better separation efficiency. Over 90% of the feed was rejected as the final tailings, meanwhile, over 85% of arsenic minerals were removed with tailings, while the WO3 loss was less than 15%.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 718-728
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Deashing and desulphurization of fine oxidized coal by falcon concentrator and flotation

Autorzy:

Zhu, X.
Tao, Y.
Sun, Q.
Man, Z.
Xian, Y.

Powiązania:

https://bibliotekanauki.pl/articles/951856.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fine oxidized coal
desulphurization
deashing
flotation
enhanced gravity separation

Opis:

Flotation and enhanced gravity separation based on different separation principles were carried out to investigate the desulphurization and deashing efficiency of fine oxidized coal. Surface properties of fresh and oxidized coals were tested by XPS and results showed that the contents of hydrophobic functional groups decreased while the content of hydrophilic functional groups increased after oxidization. Floatability and density analysis results showed that the floatability of coal samples decreased sharply because of oxidation, however, density composition of coal sample only had slight changes. Separation results showed that yields of gravity concentrates outclassed that of flotation concentrates, meanwhile, ash contents and sulfur contents of gravity concentrates were far lower than that of flotation concentrates. Yields and ash contents increased with the collector dosage and achieved to be 17.83 and 26.94% respectively when the collector dosage was 1600 g•Mg-1. Yields and ash contents of gravity concentrates decreased with the centrifugal force and increased with the recoil water flow with similar sulfur content. Clean coal with yield of 53.86%, ash content of 9.81%, sulfur content of 1.47% and with a corresponding desulphurization efficiency of 44.53% was achieved at centrifugal force of 107 g and recoil water flow of 13.3 dm3•min-1. For fine oxidized coal, enhanced gravity separation has a significant advantage of the separation efficiency compared with flotation.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 634-646
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Ontological multi-view failure modeling for ippd
Ontologiczne wielowidokowe modelowanie uszkodzeń wspierające zintegrowany rozwój produktu i procesów

Autorzy:

Ren, Y.
Sun, B.
Feng, Q.
Zeng, S.

Powiązania:

https://bibliotekanauki.pl/articles/301032.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

ontologia uszkodzeń
wiedza
niezawodność
IPPD
failure ontology
knowledge
reliability

Opis:

Reliability engineering includes series of failure focused technology and management activities running throughout the entire product development cycle. Only these activities are effectively integrated and numerous relevant failure data is synthetically applied, the intent for progressively identifying failure and continuously improving reliability can be obtained. In current engineering practice, the reliability data and knowledge produced in different development phases cannot be efficiently shared and reused. There still exist difficulties in interoperating between different reliability activities. This paper establishes the failure ontology models that contain global failure ontology model, functional failure ontology model and hardware failure ontology model. In virtue of this ontology model, the reliability activities are seamlessly integrated into the integrated product and process development (IPPD). In this model, the evolution process of failure cognition during each development phases is considered. Base on this ontology model, a reliability engineering environment is constructed with the support of PLM (Product Lifecycle Management) platform to verify the ontology model's correctness and applicability.
Inżynieria niezawodności zajmuje się prowadzeniem licznych działań w zakresie technologii uszkodzeń i zarządzania uszkodzeniami w ciągu całego cyklu rozwoju produktu. Stopniowa identyfikacja uszkodzeń oraz ciągła poprawa niezawodności jest możliwa tylko wtedy, gdy działania te zostaną skutecznie zintegrowane, przy syntetycznym uwzględnieniu szeregu istotnych danych dotyczących uszkodzeń. Obecna praktyka inżynieryjna nie pozwala na efektywną wymianę i ponowne wykorzystanie danych i wiedzy pochodzących z różnych faz rozwoju produktu. Ciągle jeszcze napotyka się trudności dotyczące interoperacyjności różnych działań ukierunkowanych na utrzymanie niezawodności. W artykule opracowano model ontologii uszkodzeń obejmujący modele ontologii uszkodzeń globalnych, funkcjonalnych i sprzętowych. Za sprawą tego modelu ontologicznego, działania niezawodnościowe stają się spójną częścią zintegrowanego rozwoju produktu i procesów (IPPD). Proponowany model uwzględnia ewolucję wiedzy na temat uszkodzenia w ciągu poszczególnych faz rozwoju. Na podstawie prezentowanego modelu ontologicznego stworzono środowisko inżynierii niezawodności oparte na platformie PLM (Zarządzanie Cyklem Życia Produktu) pozwalające zweryfikować poprawność i możliwość zastosowania omawianego modelu.

Źródło:

Eksploatacja i Niezawodność; 2011, 2; 35-41
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

A method to analyze the machining accuracy reliability sensitivity of machine tools based on Fast Markov Chain simulation
Podejście do analizy czułości niezawodnościowej dokładności obrabiarek oparte na symulacji metodą szybkich łańcuchów Markowa

Autorzy:

Cheng, Q.
Sun, B.
Zhao, Y.
Gu, P.

Powiązania:

https://bibliotekanauki.pl/articles/301814.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

machining accuracy reliability
machine tool
fast Markov Chain
reliability sensitivity analysis
integral of failure probability
niezawodność dokładności obróbki
obrabiarka
szybki łańcuch Markowa
analiza czułości niezawodnościowej
całka prawdopodobieństwa uszkodzenia

Opis:

With the ever increasing demand of higher machining accuracies, the machining accuracy reliability has evolved into an indicator to evaluate the performance of a machine tool. Consequentially, methods for improving the machining accuracy reliability have become the focus of attention for both manufacturers and users. Generally, the intercoupling geometric errors are the main cause which may lead to a reduction of the machining accuracy of machine tools. In this paper, the machining accuracy reliability is defined as the ability of a machine tool to perform at its specified machining accuracy under the stated conditions for a given period of time, and a new approach for analyzing the machining accuracy reliability of machine tools based on fast Markov chain simulations is proposed. Using this method, seven different failure modes could be determined for a machine tool. An analysis of the machining accuracy reliability sensitivity was performed based on solving the integral of the failure probability of the machine tool, and the key geometric errors which most strongly affect the machining accuracy reliability were identified. Finally, in this study, a 4-axis machine tool was selected as an example to experimentally validate the effectiveness of the proposed method.
Wraz z wciąż rosnącym zapotrzebowaniem na coraz to wyższą dokładność obróbki, niezawodność dokładności obróbki stała się wskaźnikiem pozwalającym na ocenę charakterystyk obrabiarek. W rezultacie, metody doskonalenia niezawodności dokładności obróbki znalazły się w centrum uwagi zarówno producentów jak i użytkowników tych maszyn. Na ogół, do zmniejszenia dokładności obróbki prowadzą nakładające się błędy geometryczne. W niniejszej pracy, niezawodność dokładności obróbki zdefiniowano jako zdolność obrabiarki do pracy z określoną dla niej dokładnością w zadanych warunkach przez dany okres czasu. Zaproponowano nowe podejście do analizy niezawodności dokładności obróbki oparte na symulacji metodą szybkich łańcuchów Markowa. Za pomocą tej metody, można ustalić siedem różnych przyczyn uszkodzeń obrabiarki. Analizę czułości niezawodnościowej dokładności obróbki przeprowadzono obliczając całkę prawdopodobieństwa uszkodzenia obrabiarki. Określono także kluczowe błędy geometryczne, które najsilniej wpływają na niezawodność dokładności obróbki. Wreszcie, efektywność proponowanej metody sprawdzono doświadczalnie na przykładzie obrabiarki czteroosiowej.

Źródło:

Eksploatacja i Niezawodność; 2016, 18, 4; 552-564
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

How foot morphology changes influence shoe comfort and plantar pressure before and after long distance running?

Autorzy:

Mey, Q.
Gu, Y.
Sun, D.
Fernandez, J.

Powiązania:

https://bibliotekanauki.pl/articles/306388.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ciśnienie podeszwowe
obuwie
kształt stopy
komfort
bieg długodynstansowy
foot shape
plantar pressure
footwear
comfort
long distance running

Opis:

Prolonged running has been popularized globally in recent decades. This study was aimed to reveal information about foot morphology, shoe comfort and plantar loading among recreational heel-strike runners. Methods: Twenty-six runners participated in foot morphology, perceived scores and peak pressure tests after 10- and 20-km track running. The foot morphology was measured using a 3D foot scanner, perceived scores were recorded using a visual analogue scale and plantar pressure was measured via insole plantar pressure measurement system. The statistical significance level was set at 0.05. Results: The heel midsole materials properties were measured before and after 20 km. Significant changes were observed in ball width and girth, arch height and foot volume. The perceived scores showed significance in overall, forefoot and heel comfort, arch support and forefoot width. Peak pressure to the heel, medial mid-foot and metatarsal greatly increased. The first metatarsal showed consecutive increase from static to 10 km, and 20 km, while big-toe showed a decrease. Conclusions: The morphology variations and forefoot loading concentration may lead to discomfort and possibly imply dermatological problems and metatarsal bone stress, particularly on the first metatarsal. Combining changes of heel midsole property, knowledge of foot shape, shoe perception and plantar pressure is of great value for recreational long-distance running shoes design and materials selection.

Źródło:

Acta of Bioengineering and Biomechanics; 2018, 20, 2; 179-186
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

The American Lawn Revisited: Awareness Education and Culture as Public Policies Toward Sustainable Lawn
Amerykańskie trawniki z bliska: świadomość, edukacja i kultura jako motywy polityki publicznej prowadzącej w kierunku zrównoważoności

Autorzy:

Zhang, Y.
Zheng, B.
Sun, G.
Fan, P.

Powiązania:

https://bibliotekanauki.pl/articles/371741.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN

Tematy:

grass
American culture
conspicuous consumption
industrialization
urbanization
pollution
aesthetics
landscaping
trawa
amerykańska kultura
demonstracyjna kultura
industrializacja
urbanizacja
zanieczyszczenie
estetyka
krajobraz

Opis:

Lawn has been used for landscaping, gardening, and beautification of homes and cities for a long time. The evolution of the lawn reflects important cultural and biophysical interactions between humans and nature. The American lawn, which was from Europe and has been a part of the American dream for home ownership and culture, has become an area going against nature for its extensively using chemicals and generated pollutions. Tracing how the lawn is becoming an important part of culture, this article focuses on more recent pollution and other environmental problems resulted from the lawn culture. It is argued, that awareness, education and changing culture of taste and preference can serve additional measures together with law and technological advancement toward sustainable lawn in the United States and the world.
Trawnik już o dawna był używany w kształtowaniu krajobrazu, ogrodnictwie i upiększaniu domów. Ewolucja trawników odzwierciedla istotne kulturowe i biofizyczne interakcje pomiędzy ludźmi i przyrodą. Trawnik trafił do Ameryki z Europy i stał się częścią amerykańskiego snu o własności i kulturze domu. Później stał się on jednak obszarem przeciwstawiającym się naturze z uwagi na intensywnie stosowanie substancji chemicznych i generowanie zanieczyszczeń. Wykazując, w jaki sposób trawnik staje się ważną częścią kultury, ten artykuł skupia się na bardziej aktualnych kwestiach zanieczyszczeń i innych problemów środowiskowych. Wykształcenie świadomości, zmieniającą się kultura smaku i preferencje, łącznie z prawem i technologią, mogą stanowić dodatkowe środki prowadzące w kierunku zrównoważonego kształtowania trawników w Stanach Zjednoczonych i na świecie.

Źródło:

Problemy Ekorozwoju; 2015, 10, 1; 107-115
1895-6912

Pojawia się w:

Problemy Ekorozwoju

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Selective adsorption of anionic polyacrylamide onto ultra-low ash coal and kaolinite

Autorzy:

Zou, W.
Yu, C.
Sun, C.
Cao, Y.

Powiązania:

https://bibliotekanauki.pl/articles/109333.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

coal
kaolinite
anionic polyacrylamide
adsorption
flotation

Opis:

To study the selectivity of polyacrylamide in the selective floc flotation of fine coal, adsorption of anionic polyacrylamide (PAM A401) onto ultra-low ash coal and kaolinite was studied, including the adsorption thermodynamics, floc size distribution and wettability changes. The thermodynamics of the adsorption process at the low concentration of 0-16 mg/dm3 of PAM A401 were studied at different contact times, doses, temperatures and pH values. Thermodynamic parameters of ΔGo, ΔHo, ΔSo and Ea were evaluated to understand the nature of the adsorption process. The results indicated that PAM A401 was selectively adsorbed onto ultra-low ash coal rather than kaolinite. Physical adsorption was the predominant mechanism, and the adsorption of PAM A401 at 12 mg•dm-3 onto coal was 2.15-fold larger than the adsorption on kaolinite. After the adsorption of PAM A401, the lipophilic hydrophilic ratio (LHR) of coal decreased from 9.23 to 7.28, indicating that the coal became less hydrophobic than before. In contrast, the LHR of kaolinite increased from 1.44 to 1.65. Floc size measurements showed that the d10, d50 and d90 of coal flocculated by PAM A401 (at 12 mg/dm3, pH 6.5) were 3.18, 2.76 and 2.59-fold greater than the corresponding levels of these parameters for kaolinite flocs, respectively.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 738-753
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Investigation on Irreversible Expansion of 1,3,5-Triamino-2,4,6-trinitrobenzene Cylinder

Autorzy:

Sun, J.
Kang, B.
Zhang, H.
Liu, Y.
Xia, Y.
Yao, Y.
Liu, X.

Powiązania:

https://bibliotekanauki.pl/articles/357936.pdf

Data publikacji:

2011

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

TATB
irreversible expansion
XRD
lattice parameters

Opis:

In this study, the irreversible expansion of TATB cylinder is investigated. No evident variation of the lattice parameters is observed on TATB crystal. The density of TATB powder decreases by only about 0.02% after it suffered from thermal cycling process at the range from -54 C to 74 C, while the density of TATB cylinder decreases by about 1.0%. It is suggested that the density variation of TATB powder has little contribution to the density decrease of TATB cylinder. Therefore, the increasing interstices between TATB powder originated from the thermal cycling should be responsible to the irreversible expansion of TATB cylinder.

Źródło:

Central European Journal of Energetic Materials; 2011, 8, 1; 69-79
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Comparative investigations of nonlinear and linear observers for a highly manoeuvrable target in sliding mode guidance

Autorzy:

Wang, Y.
Sun, M.
Du, S.
Chen, Z.

Powiązania:

https://bibliotekanauki.pl/articles/201020.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

guidance law
second-order sliding mode
super-twisting algorithm
linear observer
target manoeuvre
algorytm
obserwator liniowy
manewr
algorytm przesuwania

Opis:

Target manoeuvre is one of the key factors affecting guidance accuracy. To intercept highly maneuverable targets, a second-order sliding-mode guidance law, which is based on the super-twisting algorithm, is designed without depending on any information about the target motion. In the designed guidance system, the target estimator plays an essential role. Besides the existing higher-order sliding-mode observer (HOSMO), a first-order linear observer (FOLO) is also proposed to estimate the target manoeuvre, and this is the major contribution of this paper. The closed-loop guidance system can be guaranteed to be uniformly ultimately bounded (UUB) in the presence of the FOLO. The comparative simulations are carried out to investigate the overall performance resulting from these two categories of observers. The results show that the guidance law with the proposed linear observer can achieve better comprehensive criteria for the amplitude of normalised acceleration and elevator deflection requirements. The reasons for the different levels of performance of these two observer-based methods are thoroughly investigated.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 233-245
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Hydrochloric acid leaching for upgrading flotation concentrate from a low-grade bauxite ore

Autorzy:

Guan, C.
Chen, L.
Zheng, Y.
Sun, W.

Powiązania:

https://bibliotekanauki.pl/articles/110259.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

bauxite ore
hydrochloric acid leaching
concentrate upgrading
carbonate minerals

Opis:

Bauxite is the major raw material for alumina production, and its Al2O3 grade improvement or desilication is a necessary process for production of high-grade alumina concentrates from bauxite ores. In practice, flotation presents an effective method for the processing of such ores. However, it is not sufficient to produce a concentrate product with high Al2O3 grade from the ores with a single flotation process, especially from these containing abundant carbonate minerals. In this investigation, hydrochloric acid leaching was used to remove dolomite impurity from the flotation concentrate of a bauxite ore, to improve its Al2O3 grade and Al2O3/SiO2 (A/S) ratio. Effects of three dominant parameters on the leaching performance, that is leaching time, leaching temperature and hydrochloric acid concentration, were investigated in details. When these parameters were optimized, the aluminum concentrate assaying 67.41% Al2O3 with 66.84% recovery and 7.44 A/S ratio was obtained from the bauxite ore assaying 42.94% Al2O3 with 2.48 A/S ratio. It was concluded that hydrochloric acid leaching proved an effective method for upgrading of flotation concentrate from a low-grade bauxite ore containing carbonate minerals.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1038-1046
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 79.

Tytuł:

Polarization properties of Gaussian–Schell model quantization field in a turbulent marine-atmosphere

Autorzy:

Zhao, Y.
Xia, M.
Wang, Q.
Li, Y.
Hu, Z.
Sun, H.
Zhang, Y.

Powiązania:

https://bibliotekanauki.pl/articles/173639.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

polarization fluctuation
Gaussian–Schell model
marine-atmosphere
Kolmogorov turbulence

Opis:

Polarization properties of Gaussian–Schell model quantization field propagating through the Kolmogorov turbulence of a marine-atmosphere channel are studied based on the degree of quantum polarization. The effective photon annihilation and creation operators of Gaussian–Schell model quantization field propagation in a marine-atmosphere are developed by making use of the extended Huygens–Fresnel integral of quantum field. The effects of the outer scale on the degree of polarization can be neglected. As the source transverse coherent width, the number of received photons, the inner scale of turbulent eddies, and the source transverse radius decrease or the re- fractive index structure parameter increases, the degree of polarization decreases. In theory, we find that the polarization fade of marine-atmosphere turbulence channels is larger than that of terrene-atmosphere turbulence channels under same transport parameters and the channel with a stronger turbulence strength will possess a larger detection area of a polarization signal, which have potentially important implications for free-space quantum key distribution.

Źródło:

Optica Applicata; 2016, 46, 3; 335-345
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Pre-concentration of graphite and LiCoO2 in spent lithium-ion batteries using enhanced gravity concentrator

Autorzy:

Zhu, X,-N.
Tao, Y.-J.
He, Y.-Q.
Zhang, Y.
Sun, Q.-X.

Powiązania:

https://bibliotekanauki.pl/articles/109609.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

spent lithium-ion batteries
electrode material
resource utilization
pre-concentration
enhanced gravity concentrator

Opis:

The pre-concentration of electrode material of spent lithium-ion battery has great significance on the resource utilization and environmental protection. The feasibility of separation of graphite and LiCoO2 based on density difference using the enhanced gravity concentrator was verified in this paper. Combustion characteristics of LiCoO2 and graphite were used to propose a simple evaluation index of separation efficiency. Separation tests were carried out to specify the influence of operating parameters on the separation efficiency. Moreover, the effect of particle size on the separation performance was studied. Combustion characteristics results showed that mass loss of graphite was much greater than that of LiCoO2. Thus, mass loss were used to evaluate the purity of product. Effective separation of graphite and LiCoO2 was achieved by the enhanced centrifugal separator. Separation results showed that increasing centrifugal force decreased the overflow yield and increased the graphite content of the overflow stream. In addition, yield of overflow grew an increase in fluidization water pressure, while the purity of graphite in overflow decreased. The effect of particle size on the separation efficiency was also significant, the separation efficiency decreased with the decreasing of particle size.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 2; 293-299
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

A method for measuring the quality parameters of image intensifier based on projecting phase-shifting gratings

Autorzy:

Sun, S.
Cao, Y.
Chen, C.
Fu, G.
Wang, Y.
Xu, X.

Powiązania:

https://bibliotekanauki.pl/articles/174300.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

phase measurement
phase-shifting grating
distortion
image intensifier
imaging quality parameter

Opis:

A method for measuring the quality parameters of image intensifier based on projecting phase-shifting gratings is proposed. A set of designed phase-shifting gratings are projected into the measuring system orderly to obtain the magnification parameter of the measured image intensifier, and the phase caused by the measured image intensifier. After obtaining the referential phase caused by only the magnification of the measured image intensifier, the phase caused by the distortion of the measured image intensifier is extracted by phase calculating and phase unwrapping. Both the global distortion and the partial distortion of the measured image intensifier can be measured by phase-to-distortion matching at the same time. The experimental results show that the proposed method can measure the multiple quality parameters of image intensifier effectively.

Źródło:

Optica Applicata; 2018, 48, 1; 39-51
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

An improved Otsu method for oil spill detection from SAR images

Autorzy:

Yu, F.
Sun, W.
Li, J.
Zhao, Y.
Zhang, Y.
Chen, G.

Powiązania:

https://bibliotekanauki.pl/articles/47553.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

remote sensing
oil spill
detection
Otsu's method
accident
marine transport
synthetic aperture radar

Opis:

In recent years, oil spill accidents have become increasingly frequent due to the development of marine transportation and massive oil exploitation. At present, satellite remote sensing is the principal method used to monitor oil spills. Extracting the locations and extent of oil spill spots accurately in remote sensing images reaps significant benefits in terms of risk assessment and clean-up work. Nowadays the method of edge detection combined with threshold segmenta- tion (EDCTS) to extract oil information is becoming increasingly popular. However, the current method has some limitations in terms of accurately extracting oil spills in synthetic aperture radar (SAR) images, where heterogeneous background noise exists. In this study, we propose an adaptive mechanism based on Otsu method, which applies region growing combined with both edge detection and threshold segmentation (RGEDOM) to extract oil spills. Remote sensing images from the Bohai Sea on June 11, 2011 and the Gulf of Dalian on July 17, 2010 are utilized to validate the accuracy of our algorithm and the reliability of extraction results. In addition, results according to EDCTS are used as a comparator to further explore validity. The comparison with results according to EDCTS using the same dataset demonstrates that the proposed self-adapting algorithm is more robust and boasts high-accuracy. The accuracy computing by the adaptive algorithm is significantly improved compared with EDCTS and threshold method.

Źródło:

Oceanologia; 2017, 59, 3
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Electronic and Magnetic Effects on Cu Doping $Ti_2NiAl$ Heusler Alloy: A First-Principles Study

Autorzy:

Wei, X.
Chu, Y.
Sun, X.
E, Y.
Song, T.
Guo, P.

Powiązania:

https://bibliotekanauki.pl/articles/1205451.pdf

Data publikacji:

2014-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.20.Gj
61.72.S-
81.30.-t
75.50.Cc

Opis:

We investigate the effect of the electronic and magnetic properties on nonmagnetic Cu-3d atoms doping the Heusler alloy $Ti_2Ni_{1-x}Cu_xAl$ $(0 ≤ x ≤ 1)$ using first-principles calculations. The optimized lattice constants are consistent with the Vegard law, and energies of doped systems become more lower as the increase of x concentration. A critical transition diagram from half-metallic to metallic characters is discussed. In addition, the magnetic interactions between p and d states are illustrated. Finally, magnetic moments are given as a function of x value, which implies that the Slater-Pauling rule is obeyed at low Cu content $(x ≤ 0.2)$.

Źródło:

Acta Physica Polonica A; 2014, 126, 3; 795-797
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

System and Method for Simultaneous Measurement of Nitrogen Content and Uniformity of Nitration of Nitrocellulose

Autorzy:

Liu, Y.
Shao, Z.
Wang, W.
Li, W.
Lv, Y.
Sun, J.

Powiązania:

https://bibliotekanauki.pl/articles/358714.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

nitrocellulose
uniformity of nitration
nitrogen content
mixed acid nitration
cotton maturity

Opis:

Nitrocellulose (NC) is a common, commercially available, cellulosederived material and has been functionalized and widely applied in microfluidic technology, immunoassays and biochemical analyses. However, existing testing parameters always fail to completely and accurately reflect its inherent quality. In this study, we have designed and assembled a novel automatic polarizing microscope test system (PMTS) to scientifically test the nitrogen content and uniformity of nitration of NC based on the chromogenic principle of a polarization microscope. The advantages of this system are: (i) the PMTS requires less sample (only a few micrograms); (ii) the test period is shorter and the results can be obtained within 20 min; (iii) the method belongs to the nondestructive testing group, and the NC sample is not burned, dissolved, or damaged; and (iv) this method has increased accuracy, and the deviation of the nitrogen content is less than ±0.05%. The properties of various NC samples prepared by different nitricsulfuric acid systems from raw materials with diverse maturities were determined via PMTS. Five NC samples with different nitrogen contents (10.9%, 11.5%, 11.8%, 12.6% and 13.5%) were tested, and the variance of the corresponding uniformity of nitration of these samples were 3.17, 1.61, 1.15, 1.76, and 2.83. The uniformity of nitration initially decreased and then increased with increasing nitrogen content, and the best uniformity of nitration appeared at a nitrogen content of 12%. We also found that fibre maturity has a positive effect on the uniformity of nitration. This testing device and method, with its cost-effectiveness and field-portability, can significantly improve the accuracy of nitration content and uniformity, and has an important value in practical applications.

Źródło:

Central European Journal of Energetic Materials; 2018, 15, 4; 554-571
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

A generalized equivalent temperature model in a time-varying environment
Uogólniony model temperatury równoważnej w zmiennym w czasie otoczeniu

Autorzy:

Sun, L.
Gu, X.-H.
Song, P.
Di, Y.

Powiązania:

https://bibliotekanauki.pl/articles/301556.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

przyspieszone badania starzenia
temperatura równoważna
przechowywanie w warunkach naturalnych
krzywa degradacji
oringi nitrylowe
accelerated degradation test
equivalent temperature
nature storage
degradation path
rubber Orings

Opis:

Accelerated degradation test at high temperature level is a common method to accelerate the degradation of products by elevating temperature, and the obtained degradation data are then used to obtain the estimate of the performance at normal temperature after extrapolating the degradation through accelerating model. However, the normal temperature is ever-changing rather than constant. Therefore, a generalized equivalent temperature model based on power law degradation path is proposed to establish a connection between accelerated degradation data and degradation data at normal temperature. The model takes the equal degradation measure as a principle and the conclusion is demonstrated that the increments of the degradation under the same magnitude, same time and different orders of temperature stresses are same. The result shows that the empirical equivalent temperature model is a special case of the proposed model. The accuracy of the proposed model is finally demonstrated by a case study of nitrile rubber O-rings.
Przyspieszone badania degradacji (badania starzeniowe) prowadzone w warunkach wysokiej temperatury stanowią powszechnie stosowaną metodę przyspieszania starzenia produktów poprzez podwyższanie temperatury. Otrzymane w takich badaniach dane degradacyjne wykorzystuje się do szacowania wydajności produktu w temperaturze normalnej na zasadzie ekstrapolacji. Głównym ograniczeniem tej metody jest fakt, że normalna temperatura nie jest stała lecz zmienia się w czasie. Dlatego też, aby skorelować dane z przyspieszonej degradacji z danymi dotyczącymi starzenia w normalnej temperaturze, zaproponowaliśmy uogólniony model temperatury równoważnej oparty na krzywej degradacji opisanej prawem potęgowym. W modelu przyjęto zasadę równego stopnia degradacji i wykazano, że przyrosty degradacji przy tej samej wartości i czasie działania naprężeń termicznych różnego rzędu są takie same. Wyniki pokazują, że empiryczny model temperatury równoważnej jest szczególnym przypadkiem proponowanego przez nas modelu. Trafność opisanego w pracy modelu wykazano na podstawie studium przypadku dotyczącego uszczelek nitrylowych, tzw. oringów.

Źródło:

Eksploatacja i Niezawodność; 2017, 19, 3; 432-440
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Optimal control strategy for marine SSP podded propulsion motor based on strong tracking-EPF

Autorzy:

Yao, W.
Liu, Y.
Sun, H.
Zhang, G.
Zhang, J.
Zhou, M.
Sun, M.
Jiang, D.

Powiązania:

https://bibliotekanauki.pl/articles/258784.pdf

Data publikacji:

2015

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

marine electric propulsion
EPF
ST-EPF
SSP podded propulsion
propulsion motor

Opis:

Aiming at the non-linearity of state equation and observation equation of SSP (Siemen Schottel Propulsor) propulsion motor, an improved particle filter algorithm based on strong tracking extent Kalman filter (ST-EKF) was presented, and it was imported into the marine SSP propulsion motor control system. The strong tracking filter was used to update particles in the new algorithm and produce importance densities. As a result, the problems of particle degeneracy and sample impoverishment were ameliorated, the propulsion motor states and the rotor resistance were estimated simultaneously using strong track filter (STF), and the tracking ability of marine SSP propulsion motor control system was improved. Simulation result shown that the improved EPF algorithm was not only improving the prediction accuracy of the motor states and the rotor resistance, but also it can satisfy the requirement of navigation in harbor. It had the better accuracy than EPF algorithm.

Źródło:

Polish Maritime Research; 2015, S 1; 4-9
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

A novel logic-based approach for failure modes mitigation control and quantitative system reliability analyses
Oryginalna, oparta na logice metoda kontroli ograniczania przyczyn uszkodzeń i ilościowej analizy niezawodności systemu

Autorzy:

Yang, D.
Ren, Y.
Wang, Z.
Liu, L.
Sun, B.

Powiązania:

https://bibliotekanauki.pl/articles/301303.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

failure
reliability
failure mitigation control
quantitative reliability analyses
uszkodzenie
niezawodność
kontrola ograniczania uszkodzeń
ilościowe analizy niezawodności

Opis:

The core idea of reliability design is to mitigate the product’s failure modes. However, for the cross-links among potential failure modes of a complex product, it is very difficult to establish the mapping relationship between failure modes mitigation and quantitative values of reliability, and the decision of failure modes mitigation have to be performed by virtue of experience, which always increase design period. In order to solve these problems, a novel logic-based approach for failure modes mitigation control and quantitative system reliability analyses is provided. Firstly, a hybrid of active and passive control process of reliability design is proposed. Secondly, a novel concept of failure modes correlation set (FMCS) and a determination approach based on deductive theory are presented. According to the changes in failure modes probabilities of occurrence, the reliability formulas of the components and assemblies are provided to depict the effects of failure mode mitigation on reliability of components and assemblies. And then the FMCS mitigation sequence is decided to determine reliability design activities. Thirdly, a closed control process of FMCS mitigation is provided integrated with logic decision method. By exposing the design of a helicopter fuel system, the present study demonstrates that all approaches are feasible, and the relationship between reliability parameters and qualitative design exists. Hence the failure modes mitigation could be controlled for the achievement of quantitative reliability requirements.
Podstawowym problemem w procesie projektowania niezawodności jest ograniczenie przyczyn uszkodzeń produktu. Jednakże, w przypadku sieci połączeń pomiędzy możliwymi przyczynami uszkodzeń złożonego produktu, trudno jest ustalić mapę zależności pomiędzy ograniczaniem przyczyn uszkodzeń i ilościowymi wartościami niezawodności, a decyzje względem ograniczania przyczyn uszkodzeń muszą bazować na własnym doświadczeniu, co znacznie wydłuża okres projektowania. W celu rozwiązania powyższych problemów, zaproponowano oryginalną, opartą na logice, metodę kontroli ograniczania przyczyn uszkodzeń i ilościowej analizy niezawodności systemu. Na wstępie, zaproponowano mieszany proces aktywnej i pasywnej kontroli niezawodności projektu. Następnie, zaprezentowano oryginalną koncepcję zbioru korelacji przyczyn uszkodzeń (FMCS) i metodę oznaczania opartą o teorię dedukcji. Na podstawie zmian dotyczących prawdopodobieństwa występowania przyczyn uszkodzeń, określono wzory niezawodności części i układów w celu pokazania wpływu ograniczania przyczyn uszkodzeń na niezawodność części i układów. Określono następnie ograniczającą sekwencję FMCS, ażeby ustalić założenia dla projektowania niezawodności. Na koniec zaprezentowano zamknięty proces kontroli ograniczania FMCS w powiązaniu z logiczną metodą podejmowania decyzji. Analizując pod tym kątem projekt systemu paliwowego helikoptera, wykazano w niniejszej pracy przydatność wszystkich powyższych metod, jak również związek pomiędzy parametrami niezawodności a projektowaniem jakościowym. Dlatego też ograniczanie przyczyn uszkodzeń powinno być kontrolowane w celu osiągnięcia wymaganej niezawodności ilościowej.

Źródło:

Eksploatacja i Niezawodność; 2015, 17, 1; 100-106
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Reliability analysis for multi-state system based on triangular fuzzy variety subset bayesian networks
Analiza niezawodności systemu wielostanowego z zastosowaniem sieci bayesowskich opartych na rozmytych podzbiorach zmienności opisanych przez trójkątną funkcję przynależności

Autorzy:

He, Q.
Zha, Y.
Zhang, R.
Sun, Q.
Liu, T.

Powiązania:

https://bibliotekanauki.pl/articles/302183.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

teoria zbiorów rozmytych
system wielostanowy
sieć bayesowska
wypadek podczas ruchu wózka windy
analiza niezawodności
reliability analysis
fuzzy set theory
Multi-State System
Bayesian network
elevator free movement accident

Opis:

W niniejszej pracy zaproponowano nową metodę analizy niezawodności systemów wielostanowych wykorzystującą sieci Bayesa (BN) oparte na rozmytych podzbiorach zmienności opisanych za pomocą trójkątnej funkcji przynależności. Metoda ta uwzględnia rozmyty charakter danych dotyczących uszkodzeń, wielostanowość systemu oraz zmienność prawdopodobieństwa wystąpienia uszkodzenia w czasie. BN, które znalazły zastosowanie w modelowaniu i metodach obliczeniowych, wykorzystuje się także do analizy niezawodności. W przedstawionych badaniach, analizę BN uzupełniono o elementy teorii zbiorów rozmytych wykorzystując do opisu prawdopodobieństwa wystąpienia uszkodzenia, podzbiory zmienności opisane przez trójkątną funkcję przynależności. Niepewność zależności logicznej pomiędzy awariami reprezentowanymi przez różne węzły sieci opisano za pomocą tabel rozmytego prawdopodobieństwa warunkowego. W pierwszej kolejności analizowano prawdopodobieństwo uszkodzenia każdego korzenia (węzła głównego) w funkcji czasu. Następnie, wyznaczono trójkątny rozmyty podzbiór zmienności, za pomocą którego opisano rozmyte prawdopodobieństwo uszkodzenia węzłów głównych. Podzbiór ten wykorzystano do analizy niezawodności systemu wielostanowego przy pomocy rozmytych BN. Artykuł kończy opis wypadku podczas ruchu wózka windy szybkobieżnej, który potwierdza skuteczność i możliwość praktycznego wykorzystania proponowanej metody. Wyniki pokazują, że proponowane podejście może skutecznie rozwiązywać na wczesnym etapie problemy związane z niepewnością informacji oraz wielostanowością systemu.
In this paper, a novel reliability analysis method for multi-state system is proposed on the basis of triangular fuzzy variety subset Bayesian network (BN). The method considers fuzziness, multi-state, and variety of failure probability over time. With advantages in modeling and computation, the BN is utilized for reliability analysis. Fuzzy set theory is introduced into the BN analysis by using triangular fuzzy variety subset to describe failure probability. The uncertainty of fault logical relationship between different nodes is described through fuzzy conditional probability tables. As a function of time, the failure probability of each root node is analyzed first. Subsequently, the triangle fuzzy variety subset is established to describe the fuzzy failure probability of root nodes. This subset is applied to analyze the reliability of multi-state system fuzzy BN. Finally, a case study on the car free movement accident of flexible high-speed elevator lift system is used to demonstrate the effectiveness and practicality of the proposed method. Results show that the proposed approach could effectively address the problems on information uncertainty and multi-state in the early stage.

Źródło:

Eksploatacja i Niezawodność; 2017, 19, 2; 158-165
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Dynamic Characteristic Analysis of the Needle Multi-linkage Mechanism in a Carpet Tufting Machine’s Driving System
Analiza charakterystyki dynamicznej mechanizmu napędzającego system igłowy w maszynie do produkcji dywanów

Autorzy:

Xu, Y.
Sun, Z.
Huang, S.
Sheng, X.
Chi, X.

Powiązania:

https://bibliotekanauki.pl/articles/232022.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

carpet tufting machine
needle multi-linkage mechanism
kinematic characteristics
dynamic characteristics
dywan
maszyna igłowa
mechanizm napędzający igły
analiza wektorowa

Opis:

In a typical carpet tufting machine, kinematic and dynamic characteristics of the needle multi-linkage mechanism are the important factors affecting the quality of the tufting carpet. For providing a rational basis for mechanism design and vibration characteristic analysis, a mathematical model of the needle multi-linkage mechanism is constructed using the complex vector analysis method. On the basis of the model, kinematic characteristic curves and dynamic characteristic curves of the needle multi-linkage mechanism are analyzed by simulation methods. Finally experimental validation of the alternating load dynamic characteristics is performed on the needle multi-linkage mechanism in a typical carpet tufting machine. The results prove the theoretical analysis validity of the needle multi-linkage mechanism.
W typowej maszynie wiążącej dywany charakterystyki kinematyczne i dynamiczne mechanizmu napędzającego układ igieł są bardzo ważnym czynnikiem określającym jakość wytwarzanych dywanów. Dla otrzymania racjonalnej podstawy dla projektowania mechanizmu i analizy charakterystyk wibracyjnych opracowano matematyczny model mechanizmu napędzającego igły. Przy opracowaniu modelu zastosowano metodę kompleksowej analizy wektorowej. Posłużyło to do otrzymania kinematycznych i dynamicznych krzywych przebiegu. Przebiegi te analizowano za pomocą metod symulacji. Następnie oceniono wyniki eksperymentalnie stosując typową maszynę do wytwarzania dywanów. Wyniki potwierdziły prawidłowość przyjętych teoretycznie zależności.

Źródło:

Fibres & Textiles in Eastern Europe; 2016, 3 (117); 103-109
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

HPM Generation by Tri-Anode Coaxial Vircator

Autorzy:

Shao, H.
Liu, G.
Zhang, Y.
Yang, Z.
Sun, J.

Powiązania:

https://bibliotekanauki.pl/articles/1807906.pdf

Data publikacji:

2009-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.47.Gk

Opis:

A novel type of coaxial vircator with 3 anodes is proposed. The advantages on high power microwave generation is tested by particle-in-cell simulation and theoretical analysis model is set up as well. The tri-anode coaxial vircator behaves a very stable frequency in the pulse duration. In the tri-anode coaxial vircator, the injecting electron beam is well premodulated in the first anode cavity and forms an inerratic bunch-dispersion mechanism in the second anode cavity; the energy-loss electrons penetrate through the third anode and absorbed by the dumping cavity locates in the centre electrode, which helps keeping the bunch-dispersion cycle undisturbed. A 3.8 GHz tri-anode coaxial vircator is theoretically designed and optimized by particle-in-cell simulation, which gives beam-wave conversion efficiency of over 20% with a stable predominant frequency, in accordance with the particle-in-cell simulation and analytic model.

Źródło:

Acta Physica Polonica A; 2009, 115, 6; 1047-1049
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

De novo sequencing and comparative transcriptome analysis of white petals and red labella in Phalaenopsis for discovery of genes related to flower color and floral differentiation

Autorzy:

Yang, Y.
Wang, J.
Ma, Z.
Sun, G.
Zhang, C.

Powiązania:

https://bibliotekanauki.pl/articles/58306.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Botaniczne

Tematy:

sequencing
RNA sequence
transcriptome
Phalaenopsis
gene
flower
colour
floral differentiation
diversity

Opis:

Phalaenopsis is one of the world’s most popular and important epiphytic monopodial orchids. The extraordinary floral diversity of Phalaenopsis is a reflection of its evolutionary success. As a consequence of this diversity, and of the complexity of flower color development in Phalaenopsis, this species is a valuable research material for developmental biology studies. Nevertheless, research on the molecular mechanisms underlying flower color and floral organ formation in Phalaenopsis is still in the early phases. In this study, we generated large amounts of data from Phalaenopsis flowers by combining Illumina sequencing with differentially expressed gene (DEG) analysis. We obtained 37 723 and 34 020 unigenes from petals and labella, respectively. A total of 2736 DEGs were identified, and the functions of many DEGs were annotated by BLAST-searching against several public databases. We mapped 837 up-regulated DEGs (432 from petals and 405 from labella) to 102 Kyoto Encyclopedia of Genes and Genomes pathways. Almost all pathways were represented in both petals (102 pathways) and labella (99 pathways). DEGs involved in energy metabolism were significantly differentially distributed between labella and petals, and various DEGs related to flower color and floral differentiation were found in the two organs. Interestingly, we also identified genes encoding several key enzymes involved in carotenoid synthesis. These genes were differentially expressed between petals and labella, suggesting that carotenoids may influence Phalaenopsis flower color. We thus conclude that a combination of anthocyanins and/or carotenoids determine flower color formation in Phalaenopsis. These results broaden our understanding of the mechanisms controlling flower color and floral organ differentiation in Phalaenopsis and other orchids.

Źródło:

Acta Societatis Botanicorum Poloniae; 2014, 83, 3
0001-6977
2083-9480

Pojawia się w:

Acta Societatis Botanicorum Poloniae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Production of intergeneric allotetraploid between autotetraploid non-heading Chinese cabbage (Brassica campestris ssp. chinensis Makino) and autotetraploid radish (Raphanus sativus L.)

Autorzy:

Sun, C.-Z.
Li, Y.
Zhang, S.-N.
Zheng, J.-S.

Powiązania:

https://bibliotekanauki.pl/articles/56661.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Botaniczne

Tematy:

intergeneric allotetraploid
autotetraploid
non-heading cabbage
Chinese cabbage
Brassica campestris ssp.chinensis
radish
Raphanus sativus
embryo culture
simple sequence repeat

Opis:

Intergeneric hybrids between non-heading Chinese cabbage (Brassica campestris ssp. chinensis Makino; 2n = 4x = 40) and radish (Raphanus sativus L.; 2n = 4x = 36) were obtained through ovary culture and embryo rescue. Some hybrid embryos (0.11 per ovary) were produced, but only 4 of them germinated. As most hybrid embryos failed to develop into plantlets directly, plants were regenerated by inducing shoots on the cultured cotyledon and inducing roots on the root induction medium. All hybrid plants were morphologically uniform. They resembled the non-heading Chinese cabbage in the long-lived habit, the plant status, the vernalization requirement and the petiole color, while the petiole shape, leaf venation pattern and flowers were more similar to those of radish. Upon examination of the flowers, these were found to have normal pistil, but rudimentary anthers with non-functional pollen grains. The somatic chromosome number of F1 plants was 38. Analysis of SSR banding patterns provided additional confirmation of hybridity.

Źródło:

Acta Societatis Botanicorum Poloniae; 2014, 83, 1
0001-6977
2083-9480

Pojawia się w:

Acta Societatis Botanicorum Poloniae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Hydrogen sulfide modulates gastric acid secretion in rats via involvement of substance P and nuclear factor-kappaB signaling

Autorzy:

Sun, H.-Z.
Gong, X.-Y.
Wu, L.
Wang, X.-X.
Nie, Y.-N.
Shang, R.
Wang, H.
Li, Y.-C.
Sun, Q.-F.
Gao, P.-F.
Bi, J.-X.

Powiązania:

https://bibliotekanauki.pl/articles/69523.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Fizjologiczne

Tematy:

hydrogen sulphide
gastric acid secretion
rat
nuclear factor-kappaB
substance P
transient receptor potential vanilloid type 1
neurokinin-1

Źródło:

Journal of Physiology and Pharmacology; 2018, 69, 3
0867-5910

Pojawia się w:

Journal of Physiology and Pharmacology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Development of an indirect ELISA based on glycoprotein B gene for detecting of Feline herpesvirus type 1

Autorzy:

Tan, Y.
Dong, G.
Niu, J.
Guo, Y.
Yi, S.
Sun, M.
Wang, K.
Hu, G.

Powiązania:

https://bibliotekanauki.pl/articles/2087468.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

feline herpesvirus type 1
gB protein
indirect ELISA
prokaryotic expression

Źródło:

Polish Journal of Veterinary Sciences; 2019, 3; 631-633
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Motion prediction of catamaran with a semisubmersible bow in wave

Autorzy:

Sun, H.
Jing, F.
Jiang, Y.
Zou, J.
Zhuang, J.
Ma, W.

Powiązania:

https://bibliotekanauki.pl/articles/258596.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

SSB catamaran
model test
overset grid
motion region
motion response

Opis:

Compared with standard vessels, a slender catamaran with a semi-submerged bow (SSB) demonstrates superior seakeeping performance. To predict the motion of an SSB catamaran, computational fluid dynamics methods are adopted in this study and results are validated through small-scale model tests. The pitch, heave, and vertical acceleration are calculated at various wavelengths and speeds. Based on the overset grid and motion region methods, this study obtains the motion responses of an SSB catamaran in regular head waves. The results of the numerical studies are validated with the experimental data and show that the overset grid method is more accurate in predicting the motion of an SSB catamaran; the errors can be controlled within 20%. The movement data in regular waves shows that at a constant speed, the motion response initially increases and then decreases with increasing wavelength. This motion response peak is due to the encountering frequency being close to the natural frequency. Under identical sea conditions, the motion response increases with the increasing Froude number. The motion prediction results, that derive from a shortterm irregular sea state, show that there is an optimal speed range that can effectively reduce the amplitude of motion.

Źródło:

Polish Maritime Research; 2016, 1; 37-44
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Soft Sensing Method Of LS-SVM Using Temperature Time Series For Gas Flow Measurements

Autorzy:

Xu, W.
Fan, Z.
Cai, M.
Shi, Y.
Tong, X.
Sun, J.

Powiązania:

https://bibliotekanauki.pl/articles/221824.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

gas flow
soft sensor
support vector machine (SVM)
temperature time series

Opis:

This paper proposes a soft sensing method of least squares support vector machine (LS-SVM) using temperature time series for gas flow measurements. A heater unit has been installed on the external wall of a pipeline to generate heat pulses. Dynamic temperature signals have been collected upstream of the heater unit. The temperature time series are the main secondary variables of soft sensing technique for estimating the flow rate. A LS-SVM model is proposed to construct a non-linear relation between the flow rate and temperature time series. To select its inputs, parameters of the measurement system are divided into three categories: blind, invalid and secondary variables. Then the kernel function parameters are optimized to improve estimation accuracy. The experiments have been conducted both in the single-pulse and multiple-pulse heating modes. The results show that estimations are acceptable.

Źródło:

Metrology and Measurement Systems; 2015, 22, 3; 383-392
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Dynamic electric vehicles charging load allocation strategy for residential area

Autorzy:

Wang, Y.
Ma, X.
Wang, F.
Hou, X.
Sun, H.
Zheng, K.

Powiązania:

https://bibliotekanauki.pl/articles/140939.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

electric vehicles
charging power management
allocation strategy
priority assessment

Opis:

A large amount of electric vehicles (EVs) charging load will bring significant impact to the power system. An appropriate resource allocation strategy is required for securing the power system safety and satisfying EVs charging demand. This paper proposed a power coordination allocation strategy of EVs’ in distribution systems. The strategy divides the allocation into two stages. The first stage is based on scores assigned to EVs through an entropy method, whereas the second stage allocates energy according to EV’s state of charge. The charging power is delivered in order to maximize EV users’ satisfaction and fairness without violation of grid constraints. Simulation on a typical power-limited residential distribution network proves the effectiveness of the strategy. The analysis results indicate that compared with traditional methods, EVs, which have higher charging requirement and shorter available time will get more energy delivered than others. The root-mean-square-error (RMSE) and standard-deviation (SD) results prove the effectiveness of the methodology for improving the balance of power delivery.

Źródło:

Archives of Electrical Engineering; 2018, 67, 3; 641--654
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Optical properties of Nd:YbVO4 crystal

Autorzy:

Liu, F Q
Sun, S Q
Gao, C Y
Xu, J Q

Powiązania:

https://bibliotekanauki.pl/articles/174689.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Nd
YbVO4 crystal
Judd-Ofelt theory
energy transfer

Opis:

Optical characteristics of a new laser crystal Nd:YbVO4 were studied. The optical parameters of a-cut and c-cut Nd:YbVO4 crystals were calculated by the Judd–Ofelt theory. The absorption crosssection of a-cut Nd:YbVO4 crystal was 5.34×10–20 cm2 at 808 nm, while it was 4.20×10–18 cm2 of c-cut Nd:YbVO4 crystal. The properties of energy transfer between Nd and Yb ions in Nd:YbVO4 crystal were discussed. In the fluorescence spectra, a peak at 472 nm appeared, which resulted from the coupling interaction between two Yb ions.

Źródło:

Optica Applicata; 2015, 45, 1; 63-70
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

A polarization selective beam splitter based on a subwavelength multisubpart profile grating structure

Autorzy:

Xiao, Y.
Huang, L.
Wu, H.
Sun, X.
Xiao, W.
Duan, J.

Powiązania:

https://bibliotekanauki.pl/articles/174760.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

diffraction and gratings
polarizing beam splitter
PBS
leaky-mode resonance
LMR

Opis:

In this study, a polarization selective beam splitter constructed by only a single layer subwavelength multisubpart profile grating is presented. Rigorous coupled-wave analysis is adopted to investigate the properties of the structure. It is shown that for a transverse electric polarized wave, the device demonstrates very high reflectivity (>97%) from 1.46 to 1.58 μm; and for a transverse magnetic polarized wave, at the wavelength of 1.55 μm, it exhibits about 50/50 beam ratio under normal incidence. To evaluate the response of the polarizing beam splitters under variation in structure parameters, we also investigated the fabrication tolerances of the device.

Źródło:

Optica Applicata; 2016, 46, 4; 665-672
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Sensitive detection of acetylene by second derivative spectra with tunable diode laser absorption spectroscopy

Autorzy:

Deng, H.
Sun, J.
Li, P.
Liu, Y.
Yu, B.
Li, J.

Powiązania:

https://bibliotekanauki.pl/articles/174963.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

tunable diode laser absorption spectroscopy
TDLAS
signal processing
Savitzky–Golay filter
trace gas detection

Opis:

A tunable diode laser absorption spectrometer was developed for trace acetylene gas analysis, the system performance was evaluated by combing an appropriate digital signal processing methods, i.e., Savitzky–Golay smoothing and differentiation algorithm. The calculation of the derivative spectra by this method is accompanied by simultaneous data smoothing. Based on the 2nd deriv- ative spectra detection method, the Allan variance technique indicates a C₂H₂ detection limit of 1.7ppm for 1-s averaging time, and a minimum noise level of 62ppb (parts per billion), at the optimum integration time of ~60s. The calculated 2nd derivative spectra with better resolution, lower detection limits, save signal processing time, and improve the ability to distinguish unresolved spectral signals.

Źródło:

Optica Applicata; 2016, 46, 3; 353-363
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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