Skocz do pozycji: 1.

Tytuł:

Marine four-stroke Diesel engine crankshaft main bearing oil film lubrication characteristic analysis

Autorzy:

Teng, X.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/258658.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

marine four – stroke diesel engine
main bearing
elastic hydrodynamic lubrication

Opis:

The Craig-Bampton modal synthesis method was used to establish the dynamic model of marine four-stroke diesel engine body and crankshaft. Based on the Greenwood / Tripp microlong contact theory considering the surface roughness and the generalized Reynolds equation considering the oil filling rate, the elastohydrodynamic lubrication model of the main bearing of the four - stroke diesel engine is found. At the rated speed, the lubrication performance of the main bearing is simulated and analyzed by the maximum dynamic pressure, the minimum oil film thickness and the friction power. The results show that the oil pressure of 4 # main bearing is the largest and the maximum oil film pressure is in the 4 # main bearing position. The friction load of 4 # main bearing is the largest. The average oil film thickness of 4 # main bearing is the smallest and the minimum oil film The thickness also occurred in the 4 # main bearing position; it can be seen 4 # bearing the most bad lubrication conditions.

Źródło:

Polish Maritime Research; 2018, S 2; 30-34
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 2.

Tytuł:

Research on marine fhotovoltaic power forecasting based on Wavelet Transform and Echo State Network

Autorzy:

Du, X.
Wang, S.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/260584.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

marine photovoltaic power system
power forecasting
Wavelet Transform
Echo State Network

Opis:

With the rapid development of photovoltaic power generation technology, photovoltaic power generation system has gradually become an important component of the integrated energy system of marine. High precision short-term photovoltaic power generation forecasting is becoming one of the key technologies in ship energy saving and ship energy efficiency improving. Aiming at the characteristics of marine photovoltaic power generation system, we designed a highprecision power forecasting model (WT+ESN) for marine photovoltaic power generation system with anti-marine environmental interference. In this model, the information mining of the photovoltaic system in marine environment is carried out based on wavelet theory, then the forecasting model basing on echo state network is construct ed. Lastly, three kinds of error metrics are compared with the three traditional models by Matlab, the result shows that the model has high forecasting accuracy and strong robustness to marine environmental factors, which is of great significance to save fuel for ships, improve the energy utilization rate and assist the power dispatching and fuel dispatching of the marine power generation system.

Źródło:

Polish Maritime Research; 2017, S 2; 53-59
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 3.

Tytuł:

Ship collision avoidance decision model and simulation based on collision circle

Autorzy:

Zhang, J.
Hu, Q.
Liao, B.

Powiązania:

https://bibliotekanauki.pl/articles/116588.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

collision avoidance
anti-collision
collision circle
decision model
ship collision avoidance decision model
Possible Point of Collision (PPC)
Java Topology Suite (JTS)
colregs

Opis:

In order to give consideration to both comprehensive evaluation and efficient decision-making in collision avoidance decision-making process, a collision avoidance decision-making model based on collision circle is proposed by introducing the concept of collision circle. Firstly, the factors causing ship collision are analyzed. Secondly, the static and dynamic characteristics of collision circles are analyzed and summarized by using collision circle simulation cases. Thirdly, based on the static characteristics, a reasonably distributed collision avoidance decision model of (Possible Point of Collision,PPC) was established. Finally, the spatial data operations core algorithm (Java Topology Suite, JTS) is used for logical operation and visualization, so as to realize the ship collision avoidance evaluation and decision. The decision model was used to verify the accident scenario of "SANCHI", and the results showed that the obtained collision avoidance scheme was reasonable and in line with the "International Regulations for Preventing Collisions at Sea" and safety requirements, thus providing a reference for maritime operators to avoid collisions between ships.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 2; 325-334
2083-6473
2083-6481

Pojawia się w:

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

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 4.

Tytuł:

Propagation of solitary wave in non-uniform fiber system with high-order nonlinear effects

Autorzy:

Xiao, Y.
Zhang, J.
Zhang, L.

Powiązania:

https://bibliotekanauki.pl/articles/173308.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

solitary wave
coupled higher-order nonlinear Schrödinger equation
high-order nonlinear effect

Opis:

The ultra-short pulse propagation in a non-uniform fiber system is investigated based on the variable coefficient coupled higher-order nonlinear Schrödinger equation with the dispersion gain and nonlinear gain terms. By using the ansatz method and the split-step Fourier method, we get the exact solitary wave solution, with which the transmission process of the solitary wave is studied. Furthermore we obtain the stability of the solitary wave under finite initial perturbations. The interaction between two neighboring solitary waves is also studied.

Źródło:

Optica Applicata; 2018, 48, 2; 273-284
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 5.

Tytuł:

A fuzzy shape database to support conceptual design

Autorzy:

Zhang, J.
Pham, B.
Chen, P.

Powiązania:

https://bibliotekanauki.pl/articles/970432.pdf

Data publikacji:

2004

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

odwzorowanie kształtu rozmytego
baza danych rozmyta
projektowanie koncepcyjne
fuzzy shape representation
indexing and retrieval of fuzzy shapes
shape database
fuzzy database
conceptual design

Opis:

At the conceptual stage of design, designers only have vague ideas of initial shapes which they gradually refine. These imprecise shapes may be specified by a set of fuzzy shape descriptors which represent the intent of a designer. It is also desirable to be able to save them in a database for future reference or for use as initial shapes for new designs. Most research on fuzzy databases has been focused on theoretical aspects while a fuzzy database is rarely seen in practice, especially in the design area. This paper aims to construct a fuzzy shape database to support shape design by integrating fuzzy data processing and fuzzy querying functions into a conventional database. A possibility-based framework is used for a fuzzy relational database model.

Źródło:

Control and Cybernetics; 2004, 33, 1; 141-172
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 6.

Tytuł:

Structural Changes and Growth Factors of China’s Textile Industry: 1997-2012
Zmiany strukturalne i czynniki wzrostu chińskiego przemysłu tekstylnego w latach 1997-2012

Autorzy:

Zhang, J.
Liu, Y.
Cheng, L.

Powiązania:

https://bibliotekanauki.pl/articles/234180.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

China’s textile industry
structural change
growth factors
structural decomposition analysis
przemysł włókienniczy w Chinach
zmiana strukturalna
czynniki wzrostowe
analiza rozkładu strukturalnego

Opis:

In this study, the Input-Output Structural Decomposition Analysis (I-O SDA) method is adopted to analyze the structural change in China's textile industry during 1997-2012 and to measure the contribution rate of the growth factors (consumption, investment, inventory, exports and imports) affecting change in its gross output. Then the key factors and main driving forces promoting textile industry development are figured out. The results show that China's textile industry has experienced great change both in scale and structure. Among the growth factors, the contribution rate of exports is the largest, followed by investment, consumption, imports and inventory. The textile industry still relies heavily on exports, investment and consumption, while the contribution rate of imports is relatively small. In addition, technological change makes a positive contribution with technological innovation. Among the industrial sectors, the cotton& chemical fibre textile industry holds dominance, with the textile manufactured goods industry exhibiting tremendous development, the growth of the knitted textile industry fluctuating, and the wool textile industry and hemp& silk textile industry progressing slowly. Finally relevant policy suggestions are proposed to promote the balanced and coordinated development of China's textile industry.
W celu analizy strukturalnej zmian chińskiego przemysłu tekstylnego w latach 1997-2012 oraz pomiaru czynników wzrostu tj. konsumpcji, inwestycji, rezerw, eksportu i importu wpływających na zmianę wielkości produkcji globalnej zastosowano metodę analizy strukturalnej rozkładów międzygałęziowych (IO SDA). Następnie ustalono kluczowe czynniki i główne siły wspierające rozwój przemysłu włókienniczego. Wyniki pokazują, że przemysł włókienniczy w Chinach przeszedł wielką zmianę zarówno pod względem skali, jak i struktury. Wśród czynników wzrostu największy udział ma eksport, a następnie inwestycje, konsumpcja, import i rezerwy. Przemysł włókienniczy w dalszym ciągu w dużym stopniu opiera się na eksporcie, inwestycjach i konsumpcji, podczas gdy udział importu jest stosunkowo niewielki. Ponadto zmiana technologiczna ma pozytywny wpływ na innowacje. Spośród sektorów przemysłowych dominuje przemysł włókien bawełnianych i chemicznych, a przemysł tekstylny stale się rozwija, rozwój dziewiarstwa podlega fluktuacjom, a rozwój przemysłu włókien wełnianych, konopnych i jedwabnych postępuje powoli . Autorzy sformułowali pewne sugestie mające na celu promowanie zrównoważonego i skoordynowanego rozwoju chińskiego przemysłu tekstylnego.

Źródło:

Fibres & Textiles in Eastern Europe; 2018, 2 (128); 20-25
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 7.

Tytuł:

Research and application of rule updating mining algorithm for marine water quality monitoring data

Autorzy:

Sun, Q
Zhang, J.
Xu, X

Powiązania:

https://bibliotekanauki.pl/articles/258822.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

marine water quality monitoring
database updating
data mining
rule updating

Opis:

This paper studies the characteristics of marine water quality monitoring data monitored by photoelectric sensor network, mines the potential information from the massive data. on account of the continuous accumulation of monitoring data, this paper focuses on the study of database with numerical attribute and proposes a rule updating algorithm for solving the rule maintenance issues caused by changes in the database. according to the rule, the algorithm forms a new database from part of the original data and the new data, and searches the new database by random search, thus can avoid creating a large number of redundant rules and can quickly mine effective rules at the same time. experimental results show that this method not only can avoid mining in the whole original massive data, but also can improve work efficiency, and can quickly and effectively find new data and find useful rules in the data with high practicability.

Źródło:

Polish Maritime Research; 2018, S 3; 136-140
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 8.

Tytuł:

On Secrecy Performance for Energy-Harvesting Multi-Antenna Relaying Networks with a Dual-Use Source

Autorzy:

Zhang, J.
Pan, G.
Xie, Y.

Powiązania:

https://bibliotekanauki.pl/articles/226136.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

decode and forward
dual-use
energy harvesting
maximal ratio combining
secrecy outage probability

Opis:

This paper studies the secrecy performance of an energy-harvesting relaying system in the presence of a dualuse source node and an eavesdropper. Specifically, the source has dual roles in the dual-hop communication: 1) to transmit confidential information in the first hop; 2) to generate jamming signal to interfere the eavesdropper in the second hop. Moreover, the multi-antenna relay deploys a power-splitting harvesting scheme to coordinate the information receiving and energy harvesting, and adopts maximal ratio combining technique to process the multiple copies of signals. Considering decode-andforward protocol and transmit antenna selection scheme, we derive an analytical expression for secrecy outage probability, and perform Monte Carlo simulation to validate the analysis. Analytical results show that the SOP performance with the dualuse source node can be effectively improved when the relaydestination channel does not have absolute advantage over the relay-eavesdropper channel.

Źródło:

International Journal of Electronics and Telecommunications; 2018, 64, 1; 33-38
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 9.

Tytuł:

Probability of Secrecy Outage in Cognitive Radio Networks over Rician-Fading Channels

Autorzy:

Zhang, J.
Jiang, H.
Pan, G.

Powiązania:

https://bibliotekanauki.pl/articles/226243.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

cognitive radio networks
wiretap
Rician fading
secrecy outage probability
probability of non-zero secrecy capacity

Opis:

In Rician-fading scenario, cognitive radio networks (CRNs) with a source in a secondary system transmitting its confidential information to a legitimate destination in the presence of an eavesdropper, are considered in this paper. Under CRNs, the interference power reaching at primary user (PU) is limited by some pre-defined threshold. Secrecy outage not only occurs when the achievable secrecy capacity for source-destination link is smaller than a target rate, but also occurs in the case that the interference power at PU is greater than that threshold. Analytical expression for secrecy outage probability has been derived and verified with simulation results. In addition, we have also derived the analytical expression for probability of non-zero secrecy capacity.

Źródło:

International Journal of Electronics and Telecommunications; 2016, 62, 2; 153-158
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 10.

Tytuł:

Fabrication of Titanium dioxide nanotube photo-electrodes in different electrolyte mixtures and the impacts on their characteristics and photo-catalytic abilities under visible light

Autorzy:

Liu, M-T.
Zhang, J.
Wang, B.

Powiązania:

https://bibliotekanauki.pl/articles/780075.pdf

Data publikacji:

2017

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

TiO2
anodizing
electrolytes
Nanotube arrays
photo-catalysis
water pollution
water treatments
Rhodamine B

Opis:

TiO₂  nanotube arrays were fabricated using electrochemical anodization of titanium foils, where different types of electrolytes were tested to determine conceptual choice for nanotubes fabrication. These electrolytes are 1M (NH₄)₂SO₄  containing 0.5% wt NH₄F, 1M Na₂SO₄  containing 0.5% wt NH₄F, 1M NaF containing 0.5% wt (NH₄)₂SO₄  and a mixture of water: ethylene glycol 1:9 containing 0.5% wt NH₄F. The foils were marked as EG type (Ethylene Glycol), AS type (Ammonium sulfate), SS type (sodium sulfate) and SF type (sodium fluoride). The photocatalytic capabilities and characterization of the fabricated NTAs were analyzed using SEM, XRD, and DRS. The degradation ratio of designated organic pollutants (Rhodamine B) was analyzed. The obtained results have proven that foils fabricated using Ethylene glycol have significant photocatalytic abilities, with a degradation ratio of EG-SS-SF-AS types being 80% to 85%, 70% to 80%, 70% to 75% and 52% to 55%, respectively.

Źródło:

Polish Journal of Chemical Technology; 2017, 19, 1; 34-40
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 11.

Tytuł:

A new assessment method of mechanism reliability based on chance measure under fuzzy and random uncertainties
Nowa metoda oceny niezawodności mechanizmów oparta na pomiarze szansy wystąpienia zdarzenia w warunkach niepewności rozmytej i losowej

Autorzy:

Zhang, L.
Zhang, J.
Zhai, H.
Zhou, S.

Powiązania:

https://bibliotekanauki.pl/articles/301493.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

chance measure
reliability assessment
uncertainty quantification
mechanism reliability
miara szansy
ocena niezawodności
kwantyfikacja niepewności
niezawodność mechanizmu

Opis:

The traditional reliability analysis methods based on probability theory and fuzzy set theory have been widely used in engineering practice. However, these methods are unable directly measure the uncertainty of mechanism reliability with uncertain variables, i.e., subjective random and fuzzy variables. In order to address this problem, a new quantification method for the mechanism reliability based on chance theory is presented to simultaneously satisfy the duality of randomness and the subadditivity of fuzziness in the reliability problem. Considering the fact that systems usually have multilevel performance and the components have multimode failures, this paper proposes a chance theory based multi-state performance reliability model. In the proposed method, the chance measure is adopted instead of probability and possibility measures to quantify the mechanism reliability for the subjective probability or fuzzy variables. The hybrid variables are utilized to represent the random and fuzzy parameters, based on which solutions are derived to analyze the chance theory based mechanism reliability with chance distributions. Since the input parameters of the model contain fuzziness and randomness simultaneously, an algorithm based on chance measure is designed. The experimental results on the case application demonstrate the validity of the proposed method.
Tradycyjne metody analizy niezawodności oparte na teorii prawdopodobieństwa i teorii zbiorów rozmytych znajdują szerokie zastosowanie w praktyce inżynierskiej. Jednak metod tych nie można stosować do bezpośredniego pomiaru niepewności niezawodności przy niepewnych zmiennych, tj. subiektywnych zmiennych losowych i rozmytych. Aby zaradzić temu problemowi, przedstawiono nową metodę kwantyfikacji niezawodności opartą na teorii szansy, która jednocześnie spełnia aksjomaty dwoistości losowości oraz subaddytywności związanej z rozmytością w problemach niezawodności. Biorąc pod uwagę fakt, że systemy zazwyczaj charakteryzują się wielopoziomową strukturą, a uszkodzenia elementów składowych mają charakter wieloprzyczynowy, w niniejszym artykule zaproponowano model niezawodności eksploatacji systemu wielostanowego oparty na teorii szansy. W proponowanej metodzie, zamiast miar prawdopodobieństwa i możliwości, do kwantyfikacji niezawodności, w przypadku gdy dane są subiektywne zmienne losowe lub zmienne rozmyte, przyjęto miarę szansy wystąpienia zdarzenia. Do reprezentacji parametrów losowych i rozmytych wykorzystano zmienne hybrydowe, które stanowią podstawę dla wyprowadzenia rozwiązań w celu analizy niezawodności mechanizmu opartej na teorii szansy z rozkładem szans. Ponieważ parametry wejściowe modelu noszą jednocześnie znamiona rozmytości i losowości, opracowano algorytm oparty na mierze szansy. Wyniki eksperymentalne otrzymane na podstawie studium przypadku dowodzą poprawności proponowanej metody.

Źródło:

Eksploatacja i Niezawodność; 2018, 20, 2; 219-228
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 12.

Tytuł:

New bird remains from the Middle Eocene of Guangdong, China

Autorzy:

Wang, M.
Mayr, G.
Zhang, J.
Zhou, Z.

Powiązania:

https://bibliotekanauki.pl/articles/21279.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

new taxon
bird
remains
Middle Eocene
Guangdong Province
China
Aves
Ciconiiformes
Threskiornithidae
Eocene
fossil record
fossil bird
paleontology
Sanshuiornis zhangi
Huayong Formation

Opis:

We describe a new avian taxon (Sanshuiornis zhangi gen. et sp. nov.) from Middle Eocene black oil shales in the Huayong Formation of Guangdong Province, south China. The specimen consists of a distal tibiotarsus and a complete foot with tarsometatarsus and pedal digits in articulation. A preliminary phylogenetic analysis does not resolve the affinities of the fossil, but the bones show resemblances to some “ciconiiform” birds. The peculiar hypotarsus morphology, which is block−like and exhibits four cristae, resembles that of the early Eocene Rhynchaeites, which is a stem group representative of the Threskiornithidae. The new Chinese fossil has, however, proportionally longer legs than Rhynchaeites and its phylogenetic affinities probably cannot be resolved without further material.

Źródło:

Acta Palaeontologica Polonica; 2012, 57, 3
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 13.

Tytuł:

Specific emitter identification using geometric features of frequency drift curve

Autorzy:

Zhao, Y.
Wui, L.
Zhang, J.
Li, Y.

Powiązania:

https://bibliotekanauki.pl/articles/200575.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

specific emitter identification
geometric features
frequency drift
adaptive fractional spectrogram
support vector machine
emiter
cechy geometryczne
dryf częstotliwości
spektrogram

Opis:

Specific emitter identification (SEI) is a technique for recognizing different emitters of the same type which have the same modulation parameters. Using only the classic modulation parameters for recognition, one cannot distinguish different emitters of a same type. To solve the problem, new features urgently need to be developed for recognition. This paper focuses on the common phenomenon of frequency drift, defines geometric features of frequency drift curve and, finally, proposes a practical algorithm of specific emitter identification using the geometric features. The proposed algorithm consists of three processes: instantaneous frequency estimation based on the adaptive fractional spectrogram, feature extraction of frequency drift curve based on geometric methods for describing a curve and recognition process based on support vector machine. Simulation results show that the identification rate is generally more than 98% above –5 dB of signal to noise ratio (SNR), and real data experiment verifies the practical performance of the proposed algorithm.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 99-108
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 14.

Tytuł:

The demand analysis of oceanic T-S-V 3D reconstruction on wide-swath SSH data features based on ROMS and 4DVAR

Autorzy:

Zhou, C.
Zhang, J.
Yang, J.
Cao, L.

Powiązania:

https://bibliotekanauki.pl/articles/2079186.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

sea surface
anomaly
wide-swath altimeter
3D reconstruction
accuracy
Regional Ocean Modelling System
demand analysis

Opis:

Future wide-swath altimetry missions will provide high-resolution information about ocean surface elevation, and facilitate the characterization of meso- and sub-mesoscale ocean activities. In this study, the demand analysis of three-dimensional (3D) oceanic state reconstruction on wide-swath SSH data features was evaluated using a data assimilation strategy. Three groups of experiments were performed to determine if the wide-swath altimetry observations would improve the three-dimensional (3D) field estimates of ocean temperature-salinity-velocity (T-S-V), and to evaluate how the spatial and temporal resolution and accuracy of the wide-swath altimetry observations affected the ocean state estimation. The Regional Ocean Modeling System and the four-dimensional variational data assimilation method were used in the experiments, with numerical simulation for the Taiwan region at a resolution of 1/10° as the example. The sensitivity of the 3D ocean state construction to the wide-swath altimetry measurements was also investigated. The results showed that the wide-swath sea surface height (SSH) measurements would have an overall positive impact on the 3D T-S-V field and that the positive effect would increase as the resolution and accuracy of the observations increased, but the net benefits would gradually decrease. Among the three examined features of the wide-swath altimetry observations, the temporal resolution had the most influence on the 3D ocean state analysis.

Źródło:

Oceanologia; 2020, 62, 3; 309-325
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 15.

Tytuł:

Study on striking ship with loading impact on the performance of the double hull oil tanker collision

Autorzy:

Wu, W.
Yang, Y.
Zhang, J.
Lu, J.

Powiązania:

https://bibliotekanauki.pl/articles/258890.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

ship collision
fluid-structure interaction
impact parameters
numerical simulation

Opis:

Due to the great danger of the collision of oil tankers, lots of research on the collision of oil tankers has been carried out. But, at present, the research on the collision of oil tankers mainly focuses on the loading condition of the struck ship, ignores the impact on the loading condition of the striking ship. However, during the actual oil tanker collision, the striking ship is generally in the state of loading. Therefore, it is necessary to carry out the analysis of the impact of the loading condition of the striking ship on the collision damage of the oil tanker. In this paper, the effect of striking ship with loading on the impact performance of the side structure during the collision of the cargo double hull oil tanker has been investigated. The ship collision model was established by using the finite element software ANSYS/ LS-DYNA which is based on 7000 tons of double hull oil tankers. Based on the analysis of the collision force, impact of striking speed changes, impact of striking deep changes and structural energy absorption during the collision process, the influence of the striking ship with loading on the damage mechanism and the impact performance of the double shell oil ship side structure was expounded. The results show that the influence of the striking ship with loading can be great to the damage to side hull during the research of the collision performance of the oil tanker.

Źródło:

Polish Maritime Research; 2018, S 2; 42-48
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 16.

Tytuł:

Wavelength-sensitive-function-based spectral reconstruction using segmented principal component analysis

Autorzy:

Wu, G.
Shen, X.
Liu, Z.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/174199.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

spectral reconstruction
wavelength-sensitive function
segmented principal component analysis

Opis:

Spectral images provide richer information than colorimetric images. A high-dimensional spectral data presents a challenge for efficient spectral reconstruction. In conventional reconstruction methods it is very difficult to obtain good spectral and colorimetric accuracy simultaneously. In this paper, a segmented principal component analysis (SPCA) method and a weighted segmented principal component analysis (wSPCA) method are proposed for efficient reconstruction of spectral color information. The methods require, firstly, partitioning the complete spectrum of wavelengths into two subgroups, considering the sensitivity of human visual system. Then the classical principal component analysis (PCA) carried out each subgroup of data separately. The results indicated that the spectral and colorimetric accuracy of the SPCA and wSPCA outperformed the PCA and weighted PCA, and wSPCA clearly retained more color visual information.

Źródło:

Optica Applicata; 2016, 46, 3; 365-374
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 17.

Tytuł:

3-aminopropyltriethoxysilane functionalized nanoscale zero-valent iron for the removal of dyes from aqueous solution

Autorzy:

Zhang, J.
Liu, Q.
Ding, Y.
Bei, Y.

Powiązania:

https://bibliotekanauki.pl/articles/779270.pdf

Data publikacji:

2011

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

3-aminopropylotrietoksysilan
żelazo zerowartościowe
separacja magnetyczna
3-aminopropyltriethoxysilane
nano zero-valent iron
acid brilliant scarlet GR
reactive brilliant red K-2BP
magnetic separation

Opis:

Batch studies were conducted to investigate the potential of 3-aminopropyltriethoxysilane modified nano zero-valent iron (APS-NZVI) to adsorb two dyes (acid brilliant scarlet GR and reactive brilliant red K-2BP) from aqueous solution. APS-NZVI showed good adsorption performance for two dyes. Under the adsorption conditions of pH 4.5, initial concentration was 100 mg/L, and time=4h, the maximum adsorption capacities of APS-NZVI were 121.06 mg/g for acid brilliant scarlet GR and 191.5 mg/g for reactive brilliant red K-2BP, respectively. The results revealed that the adsorption behavior of the dyes on the nano-particles fitted well with the Langmuir model and the sorption kinetics fits well the pseudo-second-order rate equation.

Źródło:

Polish Journal of Chemical Technology; 2011, 13, 2; 35-39
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 18.

Tytuł:

Synthesis, characterization of Hollandite Ag2Mn8O16 on TiO2 nanotubes and their photocatalytic properties for Rhodamine B degradation

Autorzy:

Thabit, M.
Liu, H.
Zhang, J.
Wang, B.

Powiązania:

https://bibliotekanauki.pl/articles/779645.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Ag-MnO2/TiO2
Ag2Mn8O16
nanotubes
nanocrystals
Photoelectrode
electrochemical deposition
Rhodamine B
Photo-catalytic efficiency

Opis:

In this research Ag₂ Mn₈ O₁₆  nanocrysls/TiO₂ nanotubes, photoelectrodes were successfully prepared through anodization and annihilation steps, followed by electrodeposition of MnO₂  and Ag in a three electrodes cell. The obtained photoelectrodes were dried, then annealed for crystallization, the morphology and structure of the fabricated electrodes were characterized via scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The light absorption and harvesting properties were investigated through UV–visible diffuse refl ectance spectrum (DRS), photocatalytic performances were evaluated by degradation of 50 mL of Rhodamine B (5 mg L_–1 ) under Xenon light irradiation for 2 h. Results illustrated that the fabricated photoelectrodes show remarkable photo-degradation properties of organic pollutants in aqueous mediums.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 2; 85-91
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 19.

Tytuł:

Reliability based analysis and design of a tripod offshore wind turbine structure assuring serviceability performance

Autorzy:

Zhang, J.
Kang, W. H.
Zhang, C.
Sun, K.

Powiązania:

https://bibliotekanauki.pl/articles/259493.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

offshore wind turbine
tripod foundation
serviceability limit state
statistical correlation analysis
reliability analysis

Opis:

Typical tripod foundations are designed using deterministic computational models according to relevant standards and codes. However, for more cost-safety balanced design, uncertainties in significant parameters should be considered in preliminary design to ensure meeting a specific probabilistic safety target in the context of the complex configuration of a tripod structure. In this article, uncertainties associated with design parameters and modelling errors are considered using Monte Carlo simulations, in order to determine the key structural design parameters, and to determine the optimal balance between design parameters and design requirements. A Spearman rank-order correlation based analysis is carried out to understand the effects of design variables on maximum deformation, total weight, and natural frequency, and to have insight about important design parameters for improvement of a preliminary design. It is found that the tower diameter has the most significant effect on the maximum displacement on the hub as validated through engineering case studies. In addition, a statistical framework, which identifies influential design parameters and provides reliability evaluation, is proposed for the structural design of a tripod OWT system. The design cases considered in this study indicate that a simple deterministic design check cannot guarantee the required reliability level of the structure, and the cost-safety balance can be achieved by a reliability analysis with the consideration of the uncertainties in the structure.

Źródło:

Polish Maritime Research; 2018, 4; 139-148
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 20.

Tytuł:

Electrorefining of High Carbon Ferromanganese in Molten Salts to Produce Pure Ferromanganese

Autorzy:

Xiao, S.J.
Liu, W.
Gao, L.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/353411.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

high carbon ferromanganese
electrorefining
molten salts
pure ferromanganese

Opis:

High carbon ferromanganese is used as a starting material to prepare pure ferromanganese by electrorefining in molten salts. High carbon ferromanganese was applied as the anode, molybdenum was the cathode and Ag/AgCl was the reference electrode. The anodic dissolution was investigated by linear polarization in molten NaCl-KCl system. Then potentiostatic electrolysis was carried out to produce pure ferromanganese from high carbon ferromanganese. The cathodic product was determined to be a mixture of manganese and iron by x-ray diffraction (XRD). The content of carbon in the product was analyzed by carbon and sulfur analyzer. The post-electrolysis anode was characterized by scanning electron microscope (SEM). The mechanism of the anode dissolution and the distribution of the main impurity of carbon and silicon after electrolysis were discussed.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1505-1509
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 21.

Tytuł:

Experimental and simulative study on accumulator function in the process of wave energy conversion

Autorzy:

Zhang, W.
Liu, Y.
Luo, H.
Xue, G.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/259862.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

wave energy converter
AMESim simulation
accumulator
experimental verification

Opis:

In this paper, a floating-buoy wave energy converter using hydrostatic transmission system is studied. The entire work progress of wave energy power generation device is introduced, and the hydraulic transmission principles are emphasized through the simulation to verify the feasibility of design principle of hydraulic transmission system. The mathematical model of the accumulator is established and applied in the AMEsim simulation. The simulation results show that the accumulator plays an important role in the wave power hydraulic transmission system and that the correct configuration of accumulator parameters can improve the rapidity and stability of the system work. Experimental results are compared with the simulation results to validate the correctness of the simulation results. This would provide a valuable reference to the optimal design of wave power generation.

Źródło:

Polish Maritime Research; 2016, 3; 79-85
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 22.

Tytuł:

Ship Trajectory Control Optimization in Anti-collision Maneuvering

Autorzy:

Zhang, J. F.
Yang, X. D.
Zhang, D.
Haugen, S.

Powiązania:

https://bibliotekanauki.pl/articles/116373.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

anticollision
ship trajectory
genetic algorithm
route optimization

Opis:

A lot of attention is being paid to ship’s intelligent anti‐collision by researchers. Several solutions have been introduced to find an optimum trajectory for ship, such as Game Theory, Genetic or Evolutionary Algorithms and so on. However, ship’s maneuverability should be taken into consideration before their real applications. Ship’s trajectory control in anti‐collision maneuvering is studied in this paper. At first, a simple linear ship maneuverability model is introduced to simulate its movement under different speed and rudder angle. After that, ship’s trajectory control is studied by considering the duration of rudder, operation distance to turning points, and maximum angular velocity. The details for algorithm design are also introduced. By giving some restrictions according to the requirements from COLREGs, the intervals for rudder angle in different circumstances can be determined based on the curves. The results can give very meaningful guidance for seafarers when making decisions.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 89-93
2083-6473
2083-6481

Pojawia się w:

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

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 23.

Tytuł:

Dynamic characteristics of magnetic coupling in horizontal axis wave energy device

Autorzy:

Zhang, J.
Liu, Y.
Liu, J.
He, T.
Xie, Y.

Powiązania:

https://bibliotekanauki.pl/articles/258488.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

wave energy
magnetic coupling
dynamic characteristics
transfer function
step response
steady state error

Opis:

To solve the dynamic response problems of magnetic coupling in the horizontal axis wave energy device, this has researched the dynamic characteristicsof magnetic coupling. The fitting formula about torque and angle of the magnetic coupling is obtained through experiments. The mathematical models of the magnetic coupling torque transmission are established. The steady state error of the magnetic coupling and the transfer function of the output angle are obtained. The analytical solution of the step response of the output angle in time domain is derived. The influence of the torsional rigidity, the damping coefficient and the driven rotor’s rotational inertia on dynamic characteristics of the magnetic coupling isanalyzed. According to the analysis results, the design rules of magnetic coupling are proposed.

Źródło:

Polish Maritime Research; 2017, S 3; 165-170
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 24.

Tytuł:

Erratum to: Quantifying soil hydraulic properties and their uncertainties by modified GLUE method

Autorzy:

Yan, Y.
Liu, J.
Zhang, J.
Li, X.
Zhao, Y.

Powiązania:

https://bibliotekanauki.pl/articles/26617.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Źródło:

International Agrophysics; 2018, 32, 2
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 25.

Tytuł:

Soil texture distribution simulation and risk assessment using transition probability-based geostatistics

Autorzy:

Li, X.
Liu, J.
Zhang, J.
Wang, W.
Xin, W.

Powiązania:

https://bibliotekanauki.pl/articles/24270.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

soil texture
conditional simulation
risk assessment
transition probability
geostatistics

Opis:

Three dimensional soil textural structure in a township was conditionally simulated using a transition pro- bability-based indicator geostatistical method based on 270 soil texture samples from 27 profiles. Additionally the distribution of soil profiles lacking clay interlayers (indicating high irrigation water and nutrient leaching risk) was analyzed using 500 realizations from the simulation. The results indicated that the simulation could predict the soil texture distribution with low uncertainties using the existing data, and the predicted soil map (0-10 cm) formed by the maximum probable soil textures also exhibited a good agreement with the legacy soil survey map. For water and nutrient leaching risk analysis, the areas lacking clay interlayer could be located; however, their distribution was still highly uncertain if based only on the existing sampling data. That means supplementary sampling in future is required for the risk assessment, and the existing study can help to optimise the sampling points and their distribution. Generally, the transition probability-based geostatistical simulation, as a stochastic conditional simulation method, exhibited its potential in soil texture spatial reproduction and related risk assessment.

Źródło:

International Agrophysics; 2014, 28, 4
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 26.

Tytuł:

Novel Colour Clustering Method for Interlaced Multi-colored Dyed Yarn Woven Fabrics
Nowa metoda określania łączenia kolorów dla tkanin wykonanych z przeplatanych przędz barwionych

Autorzy:

Zhang, J.
Xin, B.
Shen, C.
Fang, H.
Cao, Y.

Powiązania:

https://bibliotekanauki.pl/articles/232909.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

colour clustering
Lab colour space
K-means algorithm
dyed yarn woven fabrics
image analysis
łączenie kolorów
system kolorystyczny Lab
przeplatana przędza barwiona
algorytm łączenia
analiza obrazu

Opis:

In this paper, a novel colour clustering method based on the K-means clustering algorithm is developed for interlaced multi-coloured dyed yarn woven fabrics which can be used to sort the colour of the dyed yarn for the development of a quick response fabric system. Firstly fabric images captured by a flat scanner could be decomposed into three sub-images in red, green and blue channels, respectively. Secondly median filters with different template sizes were selected to process the sub-images in the three color channels separately. Thirdly filtered images in the RGB colour space, reconstructed from the three sub-images, can be converted into the Lab colour format. Ultimately the results of colour segmentation and classification can be obtained based on the Lab color space using the improved Kmeans clustering algorithms. Our experimental results indicated that our method proposed works better than the conventional method based on subjective and manual operations with the aid of simple tools in terms of both accuracy and robustness.
Pokazano opracowanie nowej metody określania łączenia kolorów, opartej na algorytmach uzyskiwania wartości średnich mających zastosowanie przy wielokolorowych przędzach przeplatanych w tkaninach. Metoda może być stosowana przy określaniu kolorów barwionych przędz, aby uzyskać szybką odpowiedź barwy dla różnego rodzaju tkaniny. Wstępnie obrazy tkaniny uzyskane z płaskiego skanera mogą być zdekomponowane w trzy sub-obrazy w kanałach czerwonym, zielonym i niebieskim, następnie filtry uśredniające o zróżnicowanych wymiarach wzorców zostają wybrane dla obróbki sub-obrazów niezależnie w trzech kanałach barwnych. Po tym przefiltrowane obrazy w przestrzeni RGB są rekonstruowane w tych trzech kanałach i mogą być przetworzone w systemie kolorystycznym Lab. W końcu wyniki segmentacji kolorów i klasyfikacji mogą być uzyskane, bazując na przestrzeni kolorystycznej Lab przy zastosowaniu poprawionego algorytmu łączenia. Wyniki eksperymentalne wskazują, że zaproponowana metoda daje możliwość uzyskania lepszych rezultatów niż metoda konwencjonalna oparta o subiektywne, ręczne operacje z zastosowaniem prostych narzędzi.

Źródło:

Fibres & Textiles in Eastern Europe; 2015, 3 (111); 107-114
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 27.

Tytuł:

A Compact High Current Vacuum Diode Based on a Ceramic-Metal Welding Interface

Autorzy:

Xun, T.
Zhang, J.
Yang, H.
Wang, Y.
Liu, Z.

Powiązania:

https://bibliotekanauki.pl/articles/1807886.pdf

Data publikacji:

2009-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

52.59.Mv
73.20.-r
84.70.+p

Opis:

For one kind of high current diodes composed of a ceramic-metal welding vacuum interface, the electrical design was presented. For compactness, a radial type insulator and a cone-column anode crust were adopted. The shielding methods around cathode and anode region were applied to mitigate the influence of welding solder to vacuum flashover. Finite Element Analysis (FEA) simulation results indicated that by adjusting the anode outline and shielding shape, the electric fields along the ceramic were well distributed. High voltage test was conducted on a long-pulse accelerator and experimental results confirm the theoretic design: the diode can stably hold on 400 kV and 200 ns voltage pulse.

Źródło:

Acta Physica Polonica A; 2009, 115, 6; 1013-1015
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 28.

Tytuł:

Emergency management of maritime accidents in the yangtze river: problems, practice and prospects

Autorzy:

Yan, X.P.
Wu, B.
Zhang, D.
Zhang, J. F.

Powiązania:

https://bibliotekanauki.pl/articles/117335.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

inland navigation
emergency management
Yangtze River
maritime accidents
artificial societies
Computational Experiments and Parallel Execution (ACP)
eastern star
inland shipping
oil spill

Opis:

Maritime accidents have received considerable attentions due to the enormous property damage, casualties and serious environmental pollution. This paper first makes statistical analysis of the different types of maritime accidents in the period of 2012 to 2014 in the Yangtze River. Second, the problems of emergency management of maritime accidents are also proposed from the analysis of the major accident “Eastern Star”.. Afterwards, four practice cases, including decision support for maritime accidents, emergency resource allocation, emergency simulation system and effectiveness of emergency management, are introduced to present the insights gained from these practices. Last, in order to address these problems, this paper proposes that an artificial societies, Computational experiments, and Parallel execution (ACP) approach should be introduced to establish an improved management system for maritime accidents in the future, and an ACP based maritime accident emergency management framework is proposed.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 111-118
2083-6473
2083-6481

Pojawia się w:

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

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 29.

Tytuł:

Experimental investigation of a high temperature resistant and low friction fracturing fluid

Autorzy:

Xiao, B.
Zhang, S.
Zhang, J.
Hou, T.
Guo, T.

Powiązania:

https://bibliotekanauki.pl/articles/109339.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

high temperature fracturing fluid
resistance to shearing
hydroxypropyl guar
low friction
delayed crosslinking

Opis:

The performance of a hydraulic fracturing fluid (HFF) system directly determines the efficiency of stimulation. Since the targeted formations of most oil fields in China are characterized by large depth (~5000 m), high temperature (160 to 180 °C) and tight lithology, newer and suitable HFFs have to be developed. Based on a newly synthetized organo-boron/-zirconium cross-linking agent (Gh-g), a composite temperature stabilizer (WJ-6) and other optimized additives via indoor evaluation, this study introduced a novel HFF, which is thermally stable at high temperature (HT) up to 180 °C and exerted low friction pressures. The performance of HFF was evaluated in the laboratory. The experimental results showed that the HFF system performed well at HTs. It maintained a viscosity of 100 mPa•s or more after 90 min of shearing (170 s−1) at 180 °C. Furthermore, the system exhibited delayed cross-linking. It took 120 s for the cross-linking reaction to complete; therefore, the tube friction was reduced to a large extent. Another characteristic feature of the formulated HFF system was the low friction pressures, where the drag reduction percentage was in the range from 35% to 70%. Moreover, only minor damage was caused by the fluid to the formation core samples. The average core permeability damage was 19.6%. All these qualities ensure that this fluid system is in full compliance with the requirements of the fracturing treatment.

Źródło:

Physicochemical Problems of Mineral Processing; 2015, 51, 1; 37-47
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 30.

Tytuł:

Energy Levels and Oscillator Strength of Ni XXIII

Autorzy:

Hu, F.
Jiang, G.
Yang, J.
Zhang, J.
Zhao, X.

Powiązania:

https://bibliotekanauki.pl/articles/1493444.pdf

Data publikacji:

2011-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.15.V-
31.30.jc

Opis:

Energy levels and oscillator strengths have been calculated for the fine-structure transitions among the levels of the $(1s^2) 2s^2 2 p^2,$ $2s2 p^3,$ $2p^4,$ $2s^2 2p3s,$ $2s^2 2p3p,$ and $2s^2 2p3d$ configurations of Ni XXIII using the graspVU and FAC program. The extensive configuration interaction and relativistic effects have been included while generating the wave functions. The results are compared with other recent theoretical estimates, and their accuracy is assessed.

Źródło:

Acta Physica Polonica A; 2011, 120, 3; 429-437
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 31.

Tytuł:

Using a new hybrid rootstock significantly increases the grafted plant rate and watermelon yield

Autorzy:

Zhang, J.
Wang, P.
Tian, H.
Wang, Y.
Jiang, H.

Powiązania:

https://bibliotekanauki.pl/articles/26471.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Źródło:

International Agrophysics; 2019, 33, 1
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 32.

Tytuł:

Foci for Determining the Insensitivity Features of Nanometer RDX: Nanoscale Particle Size and Moderate Thermal Reactivity

Autorzy:

Wang, Y.
Song, X.
Song, D.
Zhang, J.
Song, K.

Powiązania:

https://bibliotekanauki.pl/articles/358576.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

nanometer RDX
sensitivities
reactivity
hot spots
kinetics

Opis:

In this paper, the reasons why nanometer RDX showed lower sensitivity than micro RDX is discussed. Herein we supposed two factors affect the sensitivity of nanometer RDX. Firstly, according detonation physics models, a nanometer particle size results in small hot spots and a high critical temperature. These features suggested high safety for nanometer RDX based on the hot spot theory. A further factor is the thermal reactivity of nanometer RDX, which considerably affects the safety of nanometer energetic materials. Employing the Kinetic Compensation Effect, we calculated the kinetic parameters of micro and nanometer RDX. The results indicated that there was no obvious distinction between the activation energies of micro and nanometer RDX, which implies almost the same reactivity of micro and nanometer RDX. Incorporating the results of small hot spots, high critical temperature, and the unchanged reactivity of micro and nanometer RDX, we concluded that nanometer RDX should exhibit low sensitivity as an intrinsic feature.

Źródło:

Central European Journal of Energetic Materials; 2015, 12, 4; 799-815
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 33.

Tytuł:

An efficient connected dominating set algorithm in WSNs based on the induced tree of the crossed cube

Autorzy:

Zhang, J.
Xu, L.
Zhou, S. M.
Wu, W.
Ye, X.

Powiązania:

https://bibliotekanauki.pl/articles/330830.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

wireless sensor networks
connected dominating set
induced tree
approximation algorithm
crossed cube
bezprzewodowa sieć sensorowa
podgrafy indukowane
algorytm aproksymacyjny

Opis:

The connected dominating set (CDS) has become a well-known approach for constructing a virtual backbone in wireless sensor networks. Then traffic can forwarded by the virtual backbone and other nodes turn off their radios to save energy. Furthermore, a smaller CDS incurs fewer interference problems. However, constructing a minimum CDS is an NP-hard problem, and thus most researchers concentrate on how to derive approximate algorithms. In this paper, a novel algorithm based on the induced tree of the crossed cube (ITCC) is presented. The ITCC is to find a maximal independent set (MIS), which is based on building an induced tree of the crossed cube network, and then to connect the MIS nodes to form a CDS. The priority of an induced tree is determined according to a new parameter, the degree of the node in the square of a graph. This paper presents the proof that the ITCC generates a CDS with a lower approximation ratio. Furthermore, it is proved that the cardinality of the induced trees is a Fibonacci sequence, and an upper bound to the number of the dominating set is established. The simulations show that the algorithm provides the smallest CDS size compared with some other traditional algorithms.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2015, 25, 2; 295-309
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 34.

Tytuł:

Energetic Nitrogen-rich Salts

Autorzy:

Wu, J.-W.
Zhang, J.-G.
Zhang, T.-L.
Yang, L.

Powiązania:

https://bibliotekanauki.pl/articles/358479.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

energetic salts
synthesis
characterization
crystal structure
review

Opis:

Energetic salts as a unique class of energetic materials have recently been investigated widely, since they possess advantages over their atomically similar nonionic analogues – they tend to exhibit lower vapor pressures, higher densities and better thermal stabilities. Furthermore, these salts are readily improved upon by the appropriate combination of different cations and anions. Over the last twenty years, our group has continued to synthesize and study novel ionic energetic materials. Here, we have summarized all of the series of nitrogen-rich energetic salts. This review gives an overview of the various studies dealing with synthetic aspects and some of the physicochemical properties of ionic compounds that are based on ammonia, guanidine, semicarbazide, carbohydrazide, tetrazine, tetrazole, triazole and imidazole. In addition, their potential applications in the fields of explosives and propellants are discussed. We hope these investigations will be helpful in providing a wider insight for future research in the area of energetic salts.

Źródło:

Central European Journal of Energetic Materials; 2015, 12, 3; 417-437
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 35.

Tytuł:

Analysis of recent coastline evolution due to marine reclamation projects in the Qinzhou Bay

Autorzy:

Yan, Y.
Zhang, Z.
Wang, C.
Zhang, L.
Huang, Y.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/258862.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

Qinzhou Bay
marine reclamation
remote sensing
geospatial analysis
coastline evolution

Opis:

Intense marine reclamation activities bring obvious benefits, meanwhile, these activities also influence the coastal natural formation, hydrodynamic processes and water environment etc. In order to investigate the exact influence in the Qinzhou Bay brought by marine reclamation behaviors in recent years, based on the remote sensing image data in the Qinzhou Bay in 2006, 2008, 2009, 2012 and 2014, with the help of GIS and RS software, the thesis interprets Qinzhou Bay coastline and artificial reclamation by man-machine interaction and makes quantitative analysis in the Qinzhou Bay coast evolution recently. The results show: (1) Qinzhou Bay coastal morphology change degree was strong in 2006 - 2012 and the coastline changed greatly. Originally part of the natural shore segments which had twists and turns were gradually filled into artificial coast, the coast constantly advanced to the sea, coastline became regular and straight; (2) The change degree of coastline was relatively small in 2006-2008, the average artificial coastline increased 8.86 km/a, the average artificial reclamation area was 20.79 km2 /a; in 2008-2012, the change range of coastline was the greatest, coastline changed most severely, the average artificial coastline increased 16.07 km/a, the average artificial reclamation area was 58.52 km2 /a; however, in 2012-2014, coastline change degree relatively slowed, the average artificial coastline increased 4.04 km per year, the average artificial reclamation area was 3.464 km2 /a. (3) Compared to the studies of predecessors, the innovation of this paper is that it is the first to carry out the detailed research on coastline evolution caused by reclamation engineerings of the Qinzhou Bay, then formed the change results on coastline that caused by intense human activities in the Qinzhou Bay, provided the area of the marine environment protection with full and accurate data.

Źródło:

Polish Maritime Research; 2017, S 2; 188-194
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 36.

Tytuł:

Rejuvenating older apple trees by root pruning combined with arbuscular mycorrhizal fungi

Autorzy:

Zhang, J.
Liu, J.
Zhang, Z.
Pan, S.
Yang, L.
Yang, S.

Powiązania:

https://bibliotekanauki.pl/articles/11855204.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie

Opis:

Older apple trees often demonstrate physiologically unreasonable shoot distribution due to root system aging, which results in lower fruit yield and poor fruit quality. Therefore this study was conducted to test whether root pruning combined with arbuscular mycorrhizal fungi could restore growth potential of fortyyear-old Red Fuji apple trees (Malus × domestica Borkh.) in a commercial orchard in 2013, by root pruning along both sides of rows, 80 cm from the trunk, to a depth of 30 cm and application of 100 ml arbuscular mycorrhizal inoculum per plant. Results showed that the percentage of root colonized by mycorrhizal fungi increased as root pruning was combined with arbuscular mycorrhizal fungi, however mycorrhizal colonization was not seen in the control roots and roots only by root pruning. For control tree total number of shoots decreased by 28.22% in 2015 than in 2013 and shoots mainly distributed in the outer canopy accounting for 58.10% of the total, which caused the lower light intensity inside the canopy, followed by lower fruit yield and poor fruit quality. Compared to control plant, shoot reduced by 33.96 and 38.51% in the outer canopy but increased by 97.99 and 123.69% in the inner canopy in 2015, as well as 390.20 and 478.43% in the vertical height of 1.5 to 2.5 m canopy, respectively treated by root pruning alone and combined with arbuscular mycorrhizal fungi. Root pruning alone and combined with arbuscular mycorrhizal fungi also raised the relative light intensity by 38.71 and 60.26% in the inner canopy in 2015, subsequent fruit yield by 315.79 and 373.68% respectively, in comparison to control plant. Shoot re-distribution improved fruit quality such as increase in firmness and soluble solid. Data indicated that the effect of root pruning combined with arbuscular mycorrhizal fungi on the rejuvenation of older apple trees was stronger than root pruning alone. It is therefore concluded that root pruning combined with arbuscular mycorrhizal fungi can think of as a measure to renew the older apple trees.

Źródło:

Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 3; 27-35
1644-0692

Pojawia się w:

Acta Scientiarum Polonorum. Hortorum Cultus

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 37.

Tytuł:

Solution of some problems of single-scale wavelet transform processor using a magnetostatic surface wave device

Autorzy:

Lu, W.
Kuang, L.
Lü, X.
Zhu, C.
Zhang, T.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/221174.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

wavelet transform processor
magnetostatic surface wave (MSSW)
interdigital transducer
direct coupling
insertion loss

Opis:

In this paper, we investigate the implementation schemes of a single-scale wavelet transform processor using magnetostatic surface wave (MSSW) devices. There are three implementation schemes: the interdigital transducer, the meander line transducer and the grating transducer. Because the interdigital transducer has excellent properties, namely, good frequency characteristic and low insertion loss, we use the interdigital transducer as the implementation scheme of a single-scale wavelet transform processor using MSSW device. In the paper, we also present the solutions to the three key problems: the direct coupling between the input transducer and the output transducer, the insertion loss, and the loss characteristics of the gyromagnetic film having an influence on the wavelet transform processor. There are two methods of reducing the direct coupling between the input transducer and the output transducer: increasing the distance between the input transducer and the output transducer, and placing a metal "wall" between the input transducer and the output transducer. There also are two methods of reducing the insertion loss of a single-scale wavelet transform processor using a MSSW device for scale: the appropriate thickness of the yttrium iron garnet (YIG) film and the uniform magnetic field. The smaller the ferromagnetic resonance linewidth of the gyromagnetic film, the smaller the magnetostatic wave propagation loss.

Źródło:

Metrology and Measurement Systems; 2012, 19, 4; 685-692
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 38.

Tytuł:

Mineral constituents of conserved white button mushrooms: similarities and differences

Autorzy:

Pankavec, S.
Hanc, A.
Baralkiewicz, D.
Dryzalowska, A.
Zhang, J.
Falandysz, J.

Powiązania:

https://bibliotekanauki.pl/articles/876885.pdf

Data publikacji:

2019

Wydawca:

Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny

Opis:

Background. Mushrooms are a food that is often considered as an important source of minerals and other nutrients for consumers. There is little data on the minerals in mushrooms processed culinary and on the impact of processing. Objective. The research was aimed at understanding the similarities and differences in the mineral composition (Hg, Li, Mg, Al, Co, Ni, Cu, As, Se, Rb, Sr, Ag, Cd, Cs, Sb, Tl, Pb, U, Ba, Cr, Zn, Mn and V) of white button mushrooms (Agaricus bisporus) processed in industrial conditions. Material and methods. Fungal materials came from six producers. The elements were determined by ICP-MS DRC and CV-AAS using validated methods and QA/QC protocol. The interdependencies of 18 elements and 10 batches of mushrooms examined were tested with the help of principal component analysis. Results. Some significant differences were found in the content and composition of minerals in marinated white button mushrooms depending on producer. Conserved white button mushrooms are poorer in major essential elements but also in toxic Hg, As, Ag, Cd, Sb, Tl or Pb which has been reported for unprocessed mushrooms. Conclusions. The relatively higher levels of Ag in some batches seem to be largely explained by the quality of the substrate used for mushrooms cultivation, while of Li, Rb, Cs, Cr, Al, U, V, As and Mn (in part also of Ba and Sr) largely by the quality of the marinade.
Wprowadzenie. Grzyby jadalne to surowiec spożywczy bogaty w niezbędne pierwiastki metaliczne ale też możliwie źródło narażenia konsumenta na toksyczne metale i metaloidy. Niewiele jest danych na ten temat odnośnie grzybów przetworzonych kulinarnie czy wpływu procesów przetwarzania. Cel. Badania miały na celu poznanie podobieństw i różnic w składzie mineralnym (Hg, Li, Mg, Al, Co, Ni, Cu, As, Se, Rb, Sr, Ag, Cd, Cs, Sb, Tl, Pb, U, Ba, Cr, Zn, Mn and V) pieczarek (Agaricus bisporus) przetworzonych w warunkach przemysłowych. Materiał i metody. Pieczarki pochodziły z sześciu przetwórni. W analizie zastosowano sprawdzone metodyki analityczne łącznie z bieżącą kontrolą i zapewnieniem jakości wyników analizy. Pomiar wykonano technikami ICP-MS-DRC i CV-AAS. Współzależności pomiędzy 18 pierwiastkami i 10 partiami grzybów badano metodą analizy głównych składowych. Wyniki. Wykazano duże różnice w zawartości składników mineralnych w pieczarkach z różnych przetwórni. Konserwowe pieczarki są znacznie uboższe w główne pierwiastki niezbędne ale także w pierwiastki toksyczne takie jak Hg, As, Ag, Cd, Sb, Tl czy Pb w porównaniu z opublikowanymi danymi dla grzybów nieprzetworzonych. Wnioski. Względnie większą zawartość Ag w określonych partiach badanych konserwowych pieczarek wydaje się tłumaczyć jakość podłoża zastosowanego w uprawie grzybów a w przypadku Li, Rb, Cs. Cr, Al, U, V, As i Mn (po części też Ba i Sr) główny wpływ wydaje się mieć jakość użytej zalewy (marynaty).

Źródło:

Roczniki Państwowego Zakładu Higieny; 2019, 70, 1
0035-7715

Pojawia się w:

Roczniki Państwowego Zakładu Higieny

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 39.

Tytuł:

Applying Image Analysis for Automatic Density Measurement of High-tightness Woven Fabrics
Zastosowanie analizy obrazu do automatycznej oceny gęstości tkanin o dużej zwartości

Autorzy:

Pan, R.
Zhang, J.
Li, Z.
Gao, W.
Xu, B.
Li, W.

Powiązania:

https://bibliotekanauki.pl/articles/232730.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

high-tightness woven fabric
image analysis
Fourier transform
threshold processing
image reconstruct
wysoka szczelność tkaniny
analiza obrazu
transformat Fouriera
rekonstrukcja obrazu

Opis:

To realise the density measurement of high-tightness woven fabrics, an efficient inspection method based on the structure relation is developed in this paper. The structure relations of typical HTWF, twill and satin weave are analyzed and a calculation equation of warp density is given with the fabric weave, weft density and wale density. In the experiment, the weft and wale densities are measured with the Fourier transform, image reconstruction and threshold processing based on separately captured images. The warp density is finally calculated based on the mean value of wale and weft density and the given calculation equation constructed with the weave pattern. The experimental results prove that the automatic measurement density system can realize the precise measurement of high-tightness woven fabric density with satisfactory precision and can replace the current manual analysis method.
Dla zrealizowania pomiarów gęstości tkanin o dużej zwartości opracowano metodę oceny opartą o zależności strukturalne. Zależności strukturalne typowych tkanin HTWF, o splocie skośnymi i satynowym analizowano i opracowano wzory dla obliczania gęstości osnowy, w zależności od gęstości wątku i gęstości prążków wypukłych. Przy przeprowadzeniu eksperymentu gęstości wątku i prążków wypukłych mierzono stosując transformatę Fouriera, rekonstrukcję obrazu i obliczenie wartości progowych wykorzystując indywidualnie otrzymane obrazy. Gęstość osnowy w efekcie jest obliczana w oparciu o średnią wartość gęstości prążków i wątku. Wyniki eksperymentalne potwierdziły, że automatyczny pomiar gęstości jest systemem, który może realizować precyzyjnie pomiar gęstości tkanin o dużej zwartości z zadowalającą dokładnością i w ten sposób może zastąpić dotychczas stosowane metody manualne.

Źródło:

Fibres & Textiles in Eastern Europe; 2016, 2 (116); 66-72
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 40.

Tytuł:

A New Potential Superhard Phase of $OsN_2$

Autorzy:

Fan, Q.
Wei, Q.
Yan, H.
Zhang, M.
Zhang, D.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/1205218.pdf

Data publikacji:

2014-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

62.20.de
65.40.-b
62.20.dq

Opis:

A new phase of C2/m $OsN_2$ is proposed in this paper. The crystal structure, elasticity and electronic properties of C2/m $OsN_2$ were studied by first-principles calculations. The elastic constants, the elastic moduli (B, G, and E) and Poisson's ratio v of $OsN_2$ have been investigated. From the first-principles calculations, we find that C2/m $OsN_2$ is metallic and mechanically stable. The quasi-harmonic Debye model, using a set of total energy versus molar volume obtained from the first-principles calculations, is applied to the study of the thermal and vibrational effects. The dependence of structural parameters, thermal expansions, heat capacities, Grüneisen parameters and Debye temperatures on the temperature and pressure are obtained in the whole pressure range from 0 to 80 GPa and temperature range from 0 to 800 K as well as compared with available data.

Źródło:

Acta Physica Polonica A; 2014, 126, 3; 740-746
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 41.

Tytuł:

Feature extraction of molten pool for laser welding quality real-time inspection

Autorzy:

Zhang, J
Yin, H
Huang, H
Yang, R
Yang, J
Li, Y

Powiązania:

https://bibliotekanauki.pl/articles/173597.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

laser materials processing
process monitoring and control
image analysis

Opis:

This paper proposed an image feature extraction method for laser welding molten pool inspection based on cellular neural network. TC4 titanium alloy thin plates were welded by Nd:YAG pulsed laser. A coaxial machine vision system was designed to acquire molten pool images. An auxiliary lighting source was employed to improve the molten pool image quality. By analyzing molten pool images, the welding defects such as fenestration or insufficient depth were identified. These results can be used as a feedback signal for laser power control. Experimental results showed that the proposed method can be used to improve laser welding quality.

Źródło:

Optica Applicata; 2015, 45, 4; 523-533
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 42.

Tytuł:

Measuring Thread Densities of Woven Fabric Using the Fourier Transform
Pomiar gestości nitek w tkaninach przy zastosowaniu transformaty Fouriera

Autorzy:

Pan, R.
Gao, W.
Li, Z.
Gou, J.
Zhang, J.
Zhu, D.

Powiązania:

https://bibliotekanauki.pl/articles/232458.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

thread density
woven fabric
Fourier transform
threshold segmentation
image reconstruction
gęstość nici w tkaninie
transformacja Fouriera
próg segmentacji
rekonstrukcja obrazu

Opis:

To replace time-consuming and lab-intensive of manual inspection, a Fourier transform is proposed to detect the thread densities of woven fabric in this paper. First, theories of the Fourier transform, yarn image reconstruction and the threshold method are introduced. Then the steps of fabric image acquisition, the Fourier transform of the fabric image, feature analysis in the frequency domain, image construction of fabric yarns, and threshold processing are analysed. Lastly, after locating and counting the yarns in the fabric segmentation results, thread densities of the woven fabric are calculated. The experimental results prove that the method proposed can detect the thread densities of woven fabric correctly and it can be used to replace the current manual analysis.
W celu zastąpienia pracochłonnego i czasochłonnego ręcznego sprawdzania zaproponowano specjalny system dla oznaczania gęstości nitek w tkaninie. Przedstawiono teorię transformacji Fouriera, rekonstrukcję wyglądu przędzy wraz z metodą progową. Określono stopnie akwizycji obrazu tkaniny, zastosowanie transformacji Fouriera, analizę częstotliwościową właściwości, konstrukcję obrazu nitek tkaniny i zastosowanie metody progowej. Pod koniec, po lokalizacji i zliczeniu nitek obliczono gęstość nitek w tkaninie. Wyniki pomiarów potwierdzają, że zaproponowana metoda automatycznej detekcji nitek jest prawidłowa.

Źródło:

Fibres & Textiles in Eastern Europe; 2015, 1 (109); 35-40
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 43.

Tytuł:

Analysis of the transcriptome of Potentilla sericea under cadmium stress conditions

Autorzy:

Wu, J.
Fan, W.
Gao, P.
Yang, Q.
Zhang, J.
Wang, L.

Powiązania:

https://bibliotekanauki.pl/articles/2130579.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Botaniczne

Tematy:

glutathione metabolism
sulfur metabolism

Opis:

Cadmium (Cd) stress significantly affects plant growth and development. Potentilla sericea is typically grown in gardens or as ground cover. In this study, the Cd response of P. sericea was analyzed based on physiological examinations and transcriptome analyses that uncovered the gene expression changes in P. sericea roots induced by a 7-day treatment with 90 μmol/L Cd2+. A total of 53,225 unigenes were identified, including 11,684 differentially expressed genes (DEGs; 8,083 upregulated and 3,601 downregulated). Additionally, 44 gene ontology terms and 127 Kyoto Encyclopedia of Genes and Genomes pathways were significantly enriched among these DEGs. Genes related to glutathione metabolism, plant hormone signal transduction, peroxisome processes, sulfur metabolism, and flavonoid biosynthesis pathways were confirmed as relevant to the Cd response of P. sericea. The molecular biology-related data described here may be useful for the future breeding of transgenic P. sericea plants with increased resistance to heavy metal stresses.

Źródło:

Acta Societatis Botanicorum Poloniae; 2020, 89, 4
0001-6977
2083-9480

Pojawia się w:

Acta Societatis Botanicorum Poloniae

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 44.

Tytuł:

Flotation behaviour and surface characteristic of anosovite in a sodium oleate solution

Autorzy:

Wang, Y.
Wen, S.
Zhang, J.
Wu, D.
Xian, Y.
Shen, H.

Powiązania:

https://bibliotekanauki.pl/articles/110766.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

anosovite
sodium oleate
flotation
adsorption

Opis:

Properties of anosovite in titanium slag, anosovite flotation response in a collector solution of sodium oleate, and adsorption behaviour of sodium oleate on the mineral surface were studied in the present work using XRD, Raman spectra, flotation tests, zeta potential analysis, FTIR and XPS. The results show that the anosovite crystal contains magnesium, and its chemical composition is Mg0.09Ti2.91O5. The chemical bonds on the anosovite surface mainly comprise Ti-O bonds. Micro-flotation tests indicate that anosovite has better floatability at a wide pH range and the recovery reaches 88% at pH=6, when the dosage of sodium oleate is only 4·10−6 mol/dm3. The point of zero charge of anosovite was determined near pH 3.2 by the zeta potential measurement. In the flotation process, chemical adsorption occurs between the carboxyl of sodium oleate and the titanium sites on the anosovite surface.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 714-723
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 45.

Tytuł:

A new basal eusauropod from the Middle Jurassic of Yunnan, China, and faunal compositions and transitions of Asian sauropodomorph dinosaurs

Autorzy:

Xing, L.
Miyashita, T.
Currie, P.J.
You, H.
Zhang, J.
Dong, Z.

Powiązania:

https://bibliotekanauki.pl/articles/945600.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Dinosauria
Sauropoda
Eusauropoda
Jurassic
eusauropod
paleontology
Middle Jurassic
Yunnan province
China
fauna composition
transition
Asia
sauropodomorph dinosaur
dinosaur

Opis:

Many sauropod ghost lineages cross the Middle Jurassic, indicating a time interval that requires increased sampling. A wide taxonomic spectrum of sauropodomorphs is known from the Middle Jurassic of China, but the braincase of a new sauropod, named here Nebulasaurus taito gen. et sp. nov., is distinct. Nebulasaurus is sister taxon to Spinophorosaurus from the Middle Jurassic of Africa and represents a clade of basal eusauropods previously unknown from Asia. The revised faunal list indicates dramatic transitions in sauropodomorph faunas from the Jurassic to Cretaceous of Asia; these are consistent with geographic isolation of Asia through the Late Jurassic. Non-sauropod sauropodomorphs, non-mamenchisaurid eusauropods (including basal macronarians), and mamenchisaurids successively replaced previous grades through the Jurassic, and titanosauriforms excluded all other sauropod lineages across the Jurassic–Cretaceous boundary.

Źródło:

Acta Palaeontologica Polonica; 2015, 60, 1; 145-154
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 46.

Tytuł:

Analysis of positive elevation effect and prediction of vibration velocity of bench blasting vibration

Autorzy:

Zhang, X. J.
An, H. M.

Powiązania:

https://bibliotekanauki.pl/articles/1853676.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

drgania wybuchowe
efekt podniesienia pozytywny
formuła kroku
strzał
kopalnia
blasting vibration
positive elevation effect
step formula
mine
blasting

Opis:

Accurate prediction of blasting vibration should be achieved in mine blasting production practice. It is also a critical problem in the field of blasting vibration control technology research. In this research paper, on the basis of the previous research results and taking account into the reflection principle of elastic wave at the free interface, the authours proposes the blasting seismic wave propagation model. In addition, the blasting positive elevation effect are theoretically explained in detail, and the vibration velocity prediction formula of the positive elevation effect is derived. Finally, the positive elevation effect mechanism and the step (positive) formula are calibrated based on the on-site monitoring data of blasting vibration of Qipanjing Jinou coal mine. In beirf, a theoretical basis is laid by this paper for similar blasting projects.

Źródło:

Archives of Civil Engineering; 2021, 67, 1; 599-618
1230-2945

Pojawia się w:

Archives of Civil Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 47.

Tytuł:

Preparation, Structure and Kinetic Analysis of the Thermal Behavior of Some Energetic Salts of 3-Hydrazino-4-amino-1,2,4-triazole

Autorzy:

Wu, J. T.
Zhang, J. G.
Sun, M.
Yin, X.
Zhang, T. L.

Powiązania:

https://bibliotekanauki.pl/articles/358073.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

synthesis
crystal structure
thermal analysis
3-hydrazino-4-amino-1,2,4-triazole
energetic salts

Opis:

As a key research objective for low melting explosives and propellants, energetic salts have received worldwide attention. 3-Hydrazino-4-amino-1,2,4triazole (HATr) is an important high-nitrogen compound (73.65% N) with good stability. This paper focuses on the energetic salts which were formed between HATr and picric acid (PA) or 2,4,6-trinitroresorcinol (TNR). Single crystals of HATr·PA and HATr·TNR·H2O were grown and their crystal structures determined at low temperature. They both belong to the monoclinic system, P21/n space group. The thermal characteristics of the two target salts were investigated using DSC and TG-DTG. In addition, the non-isothermal decomposition kinetics, heats of combustion and sensitivity have also been investigated. The detonation pressures (P) and detonation velocities (D) of the salts have been calculated using the K-J equations. The results indicated that both salts have certain potential applications as gunpowder and propellant materials.

Źródło:

Central European Journal of Energetic Materials; 2013, 10, 4; 481-493
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 48.

Tytuł:

Analysis of the Thermal Behaviour of CL-20, Potassium Perchlorate, Lithium Perchlorate and Their Admixtures by DSC and TG

Autorzy:

Zhang, J.-J.
Guo, X.-J.
Jiao, Q.-J.
Zhang, H.-L.
Li, H.

Powiązania:

https://bibliotekanauki.pl/articles/358770.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

CL-20
potassium perchlorate
lithium perchlorate
thermal stability
phase transition

Opis:

The thermal decomposition characteristics of CL-20, potassium perchlorate (KP), lithium perchlorate (LP), a CL-20/KP mixture, and a CL-20/LP mixture were studied using thermogravimetry-differential scanning calorimetry (TG-DSC). The DSC curves for KP exhibited three endothermic peaks and one exothermic peak. The first two endothermic peaks correspond to the rhombic-cubic transition and the fusion of KP, respectively, the third indicates the fusion of KCl, while the exothermic peak is attributed to the decomposition of KP. The DSC curves obtained from LP showed four endothermic peaks and one exothermic peak. The first two endothermic peaks indicate the loss of adsorbed water and water of crystallization, while the third and fourth are associated with the fusion of LP and LiCl, respectively; the exothermic peak is due to the decomposition of LP. The presence of KP had little effect on the thermal decomposition of CL-20 while the addition of LP increased the temperature at which CL-20 exhibits an exothermic peak. In addition, the thermal decomposition of LP appeared to be catalyzed by the presence of CL-20.

Źródło:

Central European Journal of Energetic Materials; 2018, 15, 1; 115-130
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 49.

Tytuł:

Optimal design and numerical simulation on fish-like flexible hydrofoil propeller

Autorzy:

Xue, G.
Liu, Y.
Zhang, M.
Zhang, W.
Zhang, J.
Luo, H.
Jia, R.

Powiązania:

https://bibliotekanauki.pl/articles/259984.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

bionics
flexible hydrofoil
phase angle
hydrodynamic coefficient

Opis:

Hydrofoil is widely used in underwater vehicle for the excellent hydrodynamic characteristics. Currently, researches are mostly about the rigid hydrofoil while the flexible hydrofoil, like the caudal fin, has not been studied adequately. In this paper, the fish was regarded as the bionic object. Then the kinematics model to describe the fish swimming was put forward. A fin-peduncle propulsion mechanism was designed based on the kinematics model to achieve the similar sine curve swimming model. The propulsion mechanism was optimized by Matlab to reduc the deviation between the output curve of the fin-peduncle propulsion mechanism and the ideal motion trajectory. Moreover, the motion phase angles among flexible articulations are optimized to reduce fluid resistance and improve propulsive efficiency. Finally, the fish-like hydrofoil oscillation is simulated by fluid-solid coupling method based on the Fluent. It was shown that the optimized flexible fish-like oscillation could generate the motion that follows the similar law of sine. The propulsive efficiency of oscillating hydrofoil propeller is much higher than that of the screw propeller, and the flexible oscillation has higher propulsive efficiency than the rigid oscillation without obvious fluid resistance increase.

Źródło:

Polish Maritime Research; 2016, 4; 59-66
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 50.

Tytuł:

Ship route planning using historical trajectories derived from AIS Data

Autorzy:

He, Y. K.
Zhang, D.
Zhang, J. F.
Zhang, M. Y.
Li, T. W.

Powiązania:

https://bibliotekanauki.pl/articles/116536.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Morski w Gdyni. Wydział Nawigacyjny

Tematy:

AIS Data
Automatic Identification System (AIS)
route planning
historical trajectories
AIS messages
marine traffic
Dijkstra algorithm
ant colony algorithm

Opis:

Ship route planning is one of the key issues in enhancing traffic safety and efficiency. Many route planning methods have been developed, but most of them are based on the information from charts. This paper proposes a method to generate shipping routes based on historical ship tracks. The ship's historical route information was obtained by processing the AIS data. From which the ship turning point was extracted and clustered as nodes. The ant colony algorithm was used to generate the optimize route. The ship AIS data of the Three Gorges dam area was selected as a case study. The ships’ optimized route was generated, and further compared with the actual ship's navigation trajectory. The results indicate that there is space of improvement for some of the trajectories, especially near the turning areas.

Źródło:

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 1; 69-76
2083-6473
2083-6481

Pojawia się w:

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

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 51.

Tytuł:

Research on relationship between carbon dioxide emissions, imports, exports, and population in China

Autorzy:

Jin, Q.-Y.
Zhang, J.
Gao, Y.-Q.
Su, X.
Fu, Y.-S.

Powiązania:

https://bibliotekanauki.pl/articles/207318.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

population statistics
carbon dioxide
global warming
carbon dioxide emissions
total carbon
statystyki ludności
dwutlenek węgla
globalne ocieplenie
emisja dwutlenku węgla
węgiel całkowity

Opis:

Empirical relationships between carbon dioxide emission, imports, exports, and population have been investigated. An empirical model with carbon dioxide emissions, structure and scale of import and exports, populations was built Using ridge regression analysis and observed data from 1985 to 2006 in China, we examined the relationship between each part of carbon dioxide emission and corresponding coefficients, including GIV (gross imports value), GXV (gross exports value), and P (populations). The results have shown that the increasing trend in TCOE (total carbon dioxide emissions) was determined by the exports, while its standard level is determined by population. Increasing the imports may reduce TCOE. Considering working to expand economy, the best ways for China to reduce TCOE are to introduce advanced technology and take actions to guarantee strict execution of cut-emission policy. Although the increasing imports also can reduce TCOE, it is not reasonable for the global cut-emission policy. To control population is not applicable as the immense population base, so government's publicity for low-carbon live is a necessary and feasible way to reduce carbon dioxide emission.

Źródło:

Environment Protection Engineering; 2014, 40, 2; 75-85
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 52.

Tytuł:

Transmission characteristics of 85Rb and 87Rb laser-induced dichroism atomic filters at 795 nm

Autorzy:

Peng, Y F
Zhang, W J

Powiązania:

https://bibliotekanauki.pl/articles/173843.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

atomic filter
optical anisotropy
narrowband
rubidium

Opis:

The transmission characteristics for 85Rb and 87Rb laser-induced dichroism atomic filters operating on rubidium D1 lines (795 nm) transitions are analyzed. By means of semiclassical density matrix equations of motion, a three-level model for the transmission characteristics of the ground state laser-induced dichroism atomic filter is presented. Calculative results show that this filter, using two counterpropagating pump and probe beams, can obtain higher transmission, narrower bandwidth and larger tuning capability than that using two copropagating pump and probe beams; with the aid of counterpropagating pump, the 85Rb ground state laser-induced dichroism atomic filter can be more effective to achieve higher peak transmission (>34%) and larger tunability (>1 GHz) than the 87Rb ground state laser-induced dichroism atomic filter in the same operation parameters. This result may be helpful for improving peak transmission (14.6%) of Rb ground state laser-induced dichroism atomic filter reported (CERÈ A. et al., Opt. Lett. 34(7), 2009, pp. 1012–1014).

Źródło:

Optica Applicata; 2014, 44, 1; 55-67
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 53.

Tytuł:

Theoretical Studies of High-nitrogen-containing Energetic Compounds Based on the s-Tetrazine Unit

Autorzy:

Man, T. T.
Wang, K.
Zhang, J.G.
Niu, X. Q.
Zhang, T. L.

Powiązania:

https://bibliotekanauki.pl/articles/358527.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

high-energy-density materials (HEDMs)
substituted s-tetrazine
compounds
electronic properties
thermodynamic properties
detonation
properties

Opis:

In order to develop new high-energy-density materials (HEDMs), we have investigated 12 substituted s-tetrazine (TZ) compounds, where s-tetrazine was substituted by amino, amido and related groups. Density functional theory (DFT) was used to predict the optimized geometries, electronic structures, total energy, heats of formation (HOFs) and densities. In addition the detonation properties were evaluated by using the VLW equation of state (EOS). The standard enthalpy of formation, the Gibbs free energy, entropy and equilibrium constants were used to estimate the success of the synthetic substitution reactions, which provided theoretical support for practical work. The bond dissociation energy (BDE) of bond C-R was calculated at each stage of the substitution reaction. The calculated results showed that substitution of amino, amido and their derivatives in the TZ ring enhances the HOF values and is favorable for increasing the thermal stability. The calculated detonation properties indicated that incorporating the above groups into the TZ ring is benefcial for improving the explosive performance. Considering the detonation properties and thermal stability, the 12 derivatives may be regarded as promising candidates as high-energy-density materials (HEDMs).

Źródło:

Central European Journal of Energetic Materials; 2013, 10, 2; 171-189
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 54.

Tytuł:

Direct synthesis of dimethyl carbonate and propylene glycol using potassium bicarbonate as catalyst in supercritical CO₂

Autorzy:

Wen, Y.
Zhang, R.
Cang, Y.
Zhang, J.
Liu, L.
Guo, X.
Fan, B.

Powiązania:

https://bibliotekanauki.pl/articles/778066.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

direct synthesis
dimethyl carbonate
carbon dioxide
potassium bicarbonate
supercritical fluids

Opis:

The improved one-pot synthesis of dimethyl carbonate and propylene glycol from propylene oxide, supercritical carbon dioxide, and methanol with potassium bicarbonate as the catalyst has been reported in this paper. As far as we know, it is the first time to use potassium bicarbonate only as the catalyst in the production process which is simple and cheap. Satisfactory conversion rate of propylene oxide and yield of the products could be achieved at the optimized conditions with quite a small amount of by-products. Our new method offers an attractive choice for the production of dimethyl carbonate in large-scale industry efficiently and environmental friendly.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 1; 62-65
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 55.

Tytuł:

Synthesis and Characterization of Four Energetic Transition Metal Complexes of 3,4-Diamino-1,2,4-triazole

Autorzy:

Yin, X.
Jin, X.
Xu, C.-X.
He, P.
Wang, K.
Zhang, J.-G.

Powiązania:

https://bibliotekanauki.pl/articles/358716.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

3,4-diamino-1,2,4-triazole
theoretic study
crystal structure
thermal stability
sensitivity

Opis:

Four complexes with the formula of [M5(DATr)12~14(H2O)6](ClO4)10 (M = Mn (1), Co (2), Ni (3), Zn (4)) about their synthesis, structures and some energetic properties (such as sensitivities tests) have been described, where the DATr here denotes 3,4-diamino-1,2,4-triazole. These four compounds are all light metallic complexes with good thermal stability. The structures of 2-4 were determined by single-crystal X-ray diffraction, and the crystal structures mainly consist of penta-nuclear units. All the structures have a common interesting property in which DATr plays a role of bi-dentate ligand. Besides, it is observed from the crystal structure of 4 that DATr can be also act as a mono-dentate ligand. Thermodynamic studies of their decomposition properties and kinetic parameters show that the four complexes have high thermal stabilities. Furthermore, tests of their impact and friction sensitivities show that complexes (2) and (3) can be potential candidates as primary explosives to replace toxic lead azide.

Źródło:

Central European Journal of Energetic Materials; 2016, 13, 2; 301-320
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 56.

Tytuł:

Oxygen-containing Tetrazole Salts of 3-Hydrazino-4-amino-1,2,4-triazole (HATr): Nitrogen-rich Ionic Materials with High Thermal Stability

Autorzy:

Wu, J.-T.
Zhang, J.-G.
Yin, X.
Li, T.
Wu, L.
Zhang, Z.-B.

Powiązania:

https://bibliotekanauki.pl/articles/358927.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

energetic salts
thermal stability
oxygen-containing tetrazoles
3-hydrazino-4-amino-1,2,4-triazole

Opis:

Energetic salts of doubly-protonated 3-hydrazino-4-amino-1,2,4-triazole (2-4), and mono-protonated 3-hydrazino-4-amino-1,2,4-triazole (5-7), have been prepared in high yields from the corresponding oxygen-containing tetrazoles by (i) reaction of free acids and neutral 3-hydrazino-4-amino-1,2,4-triazole, or (ii) metathesis reactions of 3-hydrazinium-4-amino-1H-1,2,4-triazolium di-chloride with the silver salts of the corresponding oxygen-containing tetrazoles. All of these energetic salts were fully characterized by single-crystal X-ray diffraction, FT-IR and DSC measurements. All of the structures are dominated by extensive hydrogen bonds due to amino groups, hydrazino groups and oxygen atoms in the molecules. These salts exhibit good thermal stability, especially the salt 3-hydrazinium-4-amino-1H-1,2,4-triazolium 1H,1’H-5,5’-bitetrazole-1,1’-diolate (4), which exhibits a measured onset of decomposition temperature of 237 °C. Quantum chemical calculations, carried out using the Gaussian 03 suite of programs and based on the experimental densities were used to calculate the detonation pressures and velocities of all of the salts.

Źródło:

Central European Journal of Energetic Materials; 2017, 14, 1; 217-232
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 57.

Tytuł:

A Comprehensive Study of the Electrostatic Discharge Sensitivity and Chargeability of Tris(carbohydrazide)zinc Perchlorate

Autorzy:

Li, Z.
Zeng, D.
Zhou, Z.
Zhou, M.
Zhang, T.
Huang, H.
Zhang, J.
Yang, L.

Powiązania:

https://bibliotekanauki.pl/articles/358298.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

primary explosive
tris(carbohydrazide)zinc perchlorate
electrostatic discharge sensitivity
chargeability

Opis:

Most primary explosives are non-conductors, easily accumulate charge when contacting with and separating from other materials, and are sensitive to electrostatic discharge (ESD). In order to reduce the number of accidents caused by ESD initiation of primary explosives, studies on their electrostatic hazards are necessary. This work presents comprehensive experimental results of electrostatic discharge sensitivity and chargeability of tris(carbohydrazide)zinc perchlorate (ZnCP) under different conditions. The influences of the testing conditions, of devices, particle size, ambient temperature and relative humidity on the electrostatic discharge sensitivity and chargeability have been investigated in detail, and the quantitative regression equations obtained.

Źródło:

Central European Journal of Energetic Materials; 2014, 11, 4; 553-573
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 58.

Tytuł:

Luminescence Decay Kinetics in GaN Studied by Frequency Domain Measurements

Autorzy:

Mickevičius, J.
Vitta, P.
Tamulaitis, G.
Žukauskas, A.
Shur, M.
Zhang, J.
Yang, J.
Gaska, R.

Powiązania:

https://bibliotekanauki.pl/articles/1813195.pdf

Data publikacji:

2008-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

72.20.Jv
78.55.Cr

Opis:

Carrier dynamics in high-quality GaN epilayer was investigated at two extreme excitation levels. Carrier lifetime under high excitation conditions was estimated by using light-induced transient grating technique. Measurements at extremely low excitation power density were performed by using frequency-domain fluorescence lifetime technique. The study was performed in a wide temperature range from 8 to 300 K. The results revealed the influence of donor-acceptor pair recombination and carrier trapping processes.

Źródło:

Acta Physica Polonica A; 2008, 113, 3; 833-837
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 59.

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

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 60.

Tytuł:

Forecast model for real time reliability of storage system based on periodic inspection and maintenance data
Model do prognozowania niezawodności systemu magazynowania w czasie rzeczywistym w oparciu o dane z przeglądów okresowych oraz dane eksploatacyjne

Autorzy:

Su, Ch.
Zhang, Y. J.
Cao, B. X.

Powiązania:

https://bibliotekanauki.pl/articles/301915.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

niezawodność magazynowania
niezawodność w czasie rzeczywistym
okresowe przeglądy i obsługa
dane cenzurowane
storage reliability
real-time reliability
periodic inspection and maintenance
censored data

Opis:

In recent years, storage reliability has attracted much attention for increasing reliability requirement. In this paper, forecast models for real-time reliability of storage system under periodic inspection and maintenance are presented, which is based on the theories of reliability physics and exponential distribution. The models are developed under two newly-defined imperfect repair modes, i.e., Improved As Bad As Old (I-ABAO) and Improved As Good As New (I-AGAN). A completion method for censored life data is also proposed by averaging the residual lifetime. According to the complete and censored lifetime data, parameters in the models are estimated by applying maximum likelihood estimation method and iterative method respectively. A numerical example of a storage system is given to verify the feasibility of the proposed completion method and the effectiveness of the two models.
W ostatnich latach wiele uwagi poświęcono tematyce niezawodności magazynowania w odniesieniu do zwiększania wymogu niezawodności. W prezentowanym artykule, przedstawiono modele do prognozowania w czasie rzeczywistym niezawodności systemu magazynowania podlegającego przeglądom okresowym i obsłudze. Modele oparto na teoriach z zakresu fizyki niezawodności oraz na rozkładzie wykładniczym. Proponowane modele opracowano dla dwóch nowo zdefiniowanych opcji niepełnej odnowy, t.j. Improved-As Bad As Old (Jak Tuż Przed Uszkodzeniem - Wersja Udoskonalona) oraz Improved-As Good As New (Jak Fabrycznie Nowy - Wersja Udoskonalona). Zaproponowano także metodę uzupełniania danych cenzurowanych (uciętych) dotyczących trwałości polegającą na uśrednianiu trwałości resztkowej. Zgodnie z pełnymi i cenzurowanymi danymi trwałościowymi, parametry w proponowanych modelach ocenia się, odpowiednio, z zastosowaniem estymacji metodą największej wiarygodności oraz metody iteracyjnej. Poprawność przedstawionej metody uzupełniania oraz efektywność proponowanych dwóch modeli zweryfikowano na podstawie numerycznego przykładu systemu magazynowania.

Źródło:

Eksploatacja i Niezawodność; 2012, 14, 4; 342-348
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 61.

Tytuł:

Coating of LiBH4 and Its Effect on the Decomposition of RDX and AP

Autorzy:

Ding, X.
Shu, Y.
Chen, Z.
Liu, N.
Gou, B.
Zhang, J.
Wu, M.
Xie, G.
Dang, T.

Powiązania:

https://bibliotekanauki.pl/articles/358086.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

coating
hydride
additive
hygroscopicity
DSC

Opis:

The novel fuel additive LiBH4 was introduced as an energetic component for its outstanding hydrogen content, perfect burning performance and high reactivity. In order to limit the hygroscopicity and to improve the stability in the air, LiBH4 was coated on the surface with wax and polyester carbonate. The final product was characterized by scanning electron microscopy (SEM), X-ray photoelectron energy spectroscopy (XPS) and Raman spectroscopy, while the stability in air was investigated by regular checking of variations in weight. The results show that a uniform coating layer was formed on the surface of the LiBH4, and the coverage was estimated from the boron content as approximately 82%. A healing effect was confirmed on defective surfaces exposed to air; the coating layer improves the relative stability by 50.7%. Furthermore, LiBH4 as an additive to promote the thermal decomposition of 1,3,5-trinitro-1,3,5-trazinane (RDX) and ammonium perchlorate (AP) was explored by differential scanning calorimetry (DSC), in which the catalytic effects of pure LiBH4 and coated LiBH4 were compared, and indicated that the coating does not decrease the reactivity of LiBH4. It is suggested that surface coating with some inert materials is a simple and effective method for improving the storage and performance of LiBH4, while ensuring its reactivity.

Źródło:

Central European Journal of Energetic Materials; 2017, 14, 1; 134-151
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 62.

Tytuł:

Experimental Studies on Charging Operation of a Compact Repetitive Tesla Transformer

Autorzy:

Zhang, Z.
Zhang, J.
Yang, H.
Qian, B.
Meng, Z.
Li, D.
Wang, S.
Cao, Y.
Zhou, W.

Powiązania:

https://bibliotekanauki.pl/articles/1807860.pdf

Data publikacji:

2009-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

84.30.Ng
84.30.Jc
84.30.Qi
84.70.+p

Opis:

Charging operations of a compact Tesla transformer were experimentally investigated, in single-shot and rep-rate (50 pps for 1 s) modes, respectively. The charging limitations were also explored. The experimental results were compared and analyzed. The maximum secondary charging voltages of the Tesla transformer were measured to be 380 kV and 300 kV in single-shot and rep-rate modes, respectively. The RMS pulse-to-pulse instability of the secondary charging voltage is generally less than 10% but increases with the increasing initial voltage across the primary capacitor. Since the secondary capacitor of the Tesla transformer is a pulse forming line (PFL), continued operation is possible if there is breakdown in the PFL. Furthermore, operation can even be continued under occasional breakdown for some pulses, without the effects on the operations of subsequent pulses.

Źródło:

Acta Physica Polonica A; 2009, 115, 6; 973-975
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 63.

Tytuł:

Serological and molecular evidence of Coxiella burnetii in samples from humans and animals in China

Autorzy:

El-Mahallawy, H.S.
Kelly, P.
Zhang, J.
Yang, Y.
Wei, L.
Tian, L.
Fan, W.
Zhang, Z.
Wang, C.

Powiązania:

https://bibliotekanauki.pl/articles/49293.pdf

Data publikacji:

2016

Wydawca:

Instytut Medycyny Wsi

Źródło:

Annals of Agricultural and Environmental Medicine; 2016, 23, 1
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 64.

Tytuł:

Speech Enhancement Based on the Multi-Scales and Multi-Thresholds of the Auditory Perception Wavelet Transform

Autorzy:

Tao, Z.
Zhao, H. M.
Zhang, X-J.
Wu, D.

Powiązania:

https://bibliotekanauki.pl/articles/177021.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

speech enhancement
low SNR
auditory perception wavelet transform
unvoiced enhancement
masking effect

Opis:

This paper proposes a speech enhancement method using the multi-scales and multi-thresholds of the auditory perception wavelet transform, which is suitable for a low SNR (signal to noise ratio) environment. This method achieves the goal of noise reduction according to the threshold processing of the human ear’s auditory masking effect on the auditory perception wavelet transform parameters of a speech signal. At the same time, in order to prevent high frequency loss during the process of noise suppression, we first make a voicing decision based on the speech signals. Afterwards, we process the unvoiced sound segment and the voiced sound segment according to the different thresholds and different judgments. Lastly, we perform objective and subjective tests on the enhanced speech. The results show that, compared to other spectral subtractions, our method keeps the components of unvoiced sound intact, while it suppresses the residual noise and the background noise. Thus, the enhanced speech has better clarity and intelligibility.

Źródło:

Archives of Acoustics; 2011, 36, 3; 519-532
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 65.

Tytuł:

Vertebral fusion in two Early Jurassic sauropodomorph dinosaurs from the Lufeg Formation of Yunnan, China

Autorzy:

Xing, L.
Rothschild, B.M.
Ran, H.
Miyashita, T.
Scott Persons IV, W.
Sekiya, T.
Zhang, J.
Wang, T.
Dong, Z.

Powiązania:

https://bibliotekanauki.pl/articles/19988.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Opis:

Here we describe two instances of pathological vertebral fusion in two genera of sauropodomorph dinosaurs from the Early Jurassic Lufeng Formation in Yunnan, China. The first is a specimen, of Lufengosaurus huenei with two fused cervical vertebrae, and the other is a specimen of the Lufeng basal sauropod, with two fused caudal vertebrae. Both pathologies are consistent with spondyloarthropathy and represent the earliest known occurrence of that disease in dinosaurs. The two specimens affirm that early dinosaurs suffered from the same bone diseases as living vertebrates. Spondyloarthropathy in these dinosaurs may have been induced by long-term mechanical stress, such as weight bearing, and/or limited motion at the joint that would otherwise have inhibited such remodeling. In both cases, surface remodeling suggests that the animals survived well beyond the initiation of spondyloarthropathy.

Źródło:

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

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 66.

Tytuł:

Bacterial communities in PM2.5 and PM10 in broiler houses at different broiler growth stages in spring

Autorzy:

Zhang, J.
Li, Y.
Xu, E.
Jiang, L.
Tang, J.
Li, M.
Zhao, X.
Chen, G.
Zhu, H.
Yu, X.
Zhang, X.

Powiązania:

https://bibliotekanauki.pl/articles/2087465.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bacterial communities
broilers
high-throughput sequencing
particulate matter

Źródło:

Polish Journal of Veterinary Sciences; 2019, 3; 495-504
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 67.

Tytuł:

Functional Properties and Electromagnetic Shielding Behaviour of Elastic Warp-knitted Fabrics
Właściwości funkcyjne i ekranowanie elektromagnetyczne elastycznych dzianin kolumienkowych

Autorzy:

Yu, Z. C.
He, H. L.
Lu, Y. H.
Zhang, J. F.
Lou, C. W.
Chen, A. P.
Lin, J. H.

Powiązania:

https://bibliotekanauki.pl/articles/232038.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

functional properties
electromagnetic shielding effectiveness
protective clothing
elastic warp-knitted fabric
electromagnetic wave
właściwości funkcjonalne
skuteczność ekranowania elektromagnetycznego
odzież ochronna
elastyczna osnowa-dzianina
fala elektromagnetyczna

Opis:

An investigation was made on the electromagnetic shielding behaviour and other functional properties for manufactured multifunctional elastic warp-knitted fabrics. Bamboo charcoal polyester/Crisscross-section polyester (BC-PET/CSP) blended yarns were used as the back of the warp-knitted fabric while conductive composite yarns were used as the front. The variation in the far infrared emissivity and anion density of elastic-warp knitted fabrics produced with different proportions of BC-PET content were studied in detail. Moreover the electromagnetic shielding effectiveness (EMSE) of the fabrics with different elongation was measured in this study. The experimental results showed that increased elongation almost did not significantly affect the EM shielding behaviour of fabric K1 in the elongation range of 0 - 40%. Finally to increase the EMSE of the fabric, the lamination method was used in this study. EMSE measurement results showed that two layer K1 warpknitted fabrics with 90° interval displayed a better shielding effect against the EM wave compared to that with a 0° interval.
Przeprowadzono badania właściwości ekranujących przed polem elektromagnetycznym i innych właściwości funkcyjnych wyprodukowanych wielofunkcyjnych elastycznych dzianin kolumienkowych. Zastosowano przędze kompozytowe z mieszanek zawierających drut ze stali kwasoodpornej, ciągłe włókna poliamidowe i poliestrowe oraz cięte włókna ze regenerowanej celulozy z surowca bambusowego. Badano emisyjność w dalekiej podczerwieni i gęstość anionową dzianin kolumienkowych wytworzonych przy rożnych proporcjach zastosowanych składników. Poza tym badano efektywność ochrony elektromagnetycznej dzianin przy rożnych wydłużeniach. Wyniki eksperymentów pokazują, że zwiększone wydłużenie prawie nie wpływa istotnie na właściwości ekranujące. Dla zwiększenia efektu ekranowania zastosowano metodę laminacji.

Źródło:

Fibres & Textiles in Eastern Europe; 2015, 5 (113); 78-83
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 68.

Tytuł:

Identification of medicinal plant Schisandra chinensis using a potential DNA barcode ITS2

Autorzy:

Li, X.-K.
Wang, B.
Han, R.-C.
Zheng, Y.-C.
Yin, H.-B.
Xu, L.
Zhang, J.-K.
Xu, B.-L.

Powiązania:

https://bibliotekanauki.pl/articles/56996.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Botaniczne

Tematy:

identification
internal transcribed spacer
medicinal plant
Schisandra chinensis
DNA barcode

Opis:

To test whether the internal transcribed spacer 2 (ITS2) region is an effective marker for using in authenticating of the Schisandra chinensis at the species and population levels, separately. And the results showed that the wild populations had higher percentage of individuals that had substitution of C→A at site 86-bp than the cultivated populations. At sites 10-bp, 37-bp, 42-bp and 235-bp, these bases of the Schisandra sphenanthera samples differed from that of S. chinensis. Two species showed higher levels of inter-specific divergence than intra-specific divergence within ITS2 sequences. However, 24 populations did not demonstrate much difference as inter-specific and intra-specific divergences were concerned. Both S. chinensis and S. sphenanthera showed monophyly at species level, yet the samples of different populations shown polyphyly at population level. ITS2 performed well when using BLAST1 method. ITS2 obtained 100% identification success rates at the species level for S. chinensis, with no ambiguous identification at the genus level for ITS2 alone. The ITS2 region could be used to identify S. chinensis and S. sphenanthera in the “Chinese Pharmacopoeia”. And it could also correctly distinguish 100% of species and 100% of genera from the 193 sequences of S. chinensis. Hence, the ITS2 is a powerful and efficient tool for species identification of S. chinensis.

Źródło:

Acta Societatis Botanicorum Poloniae; 2013, 82, 4
0001-6977
2083-9480

Pojawia się w:

Acta Societatis Botanicorum Poloniae

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 69.

Tytuł:

Scale effect of cement mortar specimens subjected to high temperatures using uniaxial compressive and splitting tensile tests

Autorzy:

Xiong, L. X.
Zhang, X. J.
Xu, Z. Y.
Geng, D. X.

Powiązania:

https://bibliotekanauki.pl/articles/230921.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

zaprawa cementowa
temperatura wysoka
ściskanie jednoosiowe
rozciąganie przy rozłupywaniu
efekt skali
cement mortar
high temperature
uniaxial compression
splitting tensile
scale effect

Opis:

In this study, cubic and cylindrical cement mortar specimens were first subjected to high temperatures, then the cubic and cylindrical specimens were taken out and conducted with uniaxial compressive test and splitting tensile test, respectively. The effect of the length to side ratio on the uniaxial compressive properties and the effect of thickness-to-diameter ratio on the splitting tensile properties of cement mortar specimens after high temperature were studied. Test results show that: (1) With temperature increasing from 25 ºC (room temperature) to 400 ºC, the compressive strength and elastic modulus of cubic specimens with three kinds of side lengths decrease; the decreasing rates of compressive strength and elastic modulus of cubic specimen with side length of 70.7 mm is higher than those of cubic specimens with side length of 100 mm and 150 mm, and the strain at the peak stress of cubic specimens with three kinds of side lengths increase. (2) After the same temperature, the tensile strength of cylindrical specimen decreases with the thickness-to-diameter ratio increasing from 0.5 to 1.0. The decreasing rate of tensile strength of cylindrical specimen with thickness-to-diameter ratio is highest when the temperature is 25 ºC (room temperature), followed by that after the temperature of 200 ºC, and that after the temperature of 400 ºC is the lowest.

Źródło:

Archives of Civil Engineering; 2020, 66, 3; 139-155
1230-2945

Pojawia się w:

Archives of Civil Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 70.

Tytuł:

Assessing soil environmental capacity on different land uses in a suburban area of Chengdu, China

Autorzy:

Yang, W.-L.
Zhou, W.-Y.
Wan, W.-X.
Gou, S.-Z.
Zhang, J.
Deng, S.-H.
Shen, F.
Wang, Y.-J.
Yang, H.
Luo, L.

Powiązania:

https://bibliotekanauki.pl/articles/207670.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

China
soil pollution
heavy metals
soil
vegetables
Chiny
zanieczyszczenie gleby
metale ciężkie
gleba
warzywa

Opis:

Wenjiang (China) is the area which undertakes high-intensity planting activities. Additionally, the soil environmental capacity has been a hot area of research as it plays a key role in environmental protection planning, environmental impact assessment and sustainable development. In this paper, the static model of soil environmental capacity is employed to investigate the distribution of residual soil environmental capacity in Wenjiang. The results show that the soil environmental capacity of mercury is the largest for industrial land while it is the lowest in garlic-rice planting areas; the soil environmental capacity of arsenic is the largest in city construction land while it is the lowest in ecological conservation zone; the soil environmental capacity of lead is the largest in city construction land while it is the lowest in garlic-rice planting areas; and the soil environmental capacity of chromium is the largest in city construction land while it is the lowest in garlic-rice planting areas.

Źródło:

Environment Protection Engineering; 2019, 45, 2; 55-67
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 71.

Tytuł:

The lobopod Onychodictyon from the Lower Cambrian Chengjiang Lagerstatte revisited

Autorzy:

Liu, J
Shu, D.
Han, J.
Zhang, Z.
Zhang, X.

Powiązania:

https://bibliotekanauki.pl/articles/21235.pdf

Data publikacji:

2008

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Yunnan
antenna
paleontology
Chengjiang Lagerstatte
Lobopodia
Arthropoda
lobopod
Cambrian
Lower Cambrian

Opis:

Onychodictyon ferox, from the Lower Cambrian Chengjiang Lagerstätte, is a worm−like armored lobopod with 10 pairs of dorsal plates and a pair of probable sensory appendages (“antennae”). Newly discovered complete specimens show that Onychodictyon is represented by two species: O. ferox with a “head” bearing a pair of dorsal “antennae” and a trunk with 11 pairs of limbs, whereas O. gracilis has a blunt anterior end without any appendages and a trunk with 12 pairs of limbs. Because of the close resemblance of the “antennae” of O. ferox and those of the lobopod Miraluolishania, they are considered to be homologous structures. The “antennae” of Cambrian lobopodians are proposed to be homologous with the arthropod antennulae.

Źródło:

Acta Palaeontologica Polonica; 2008, 53, 2
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 72.

Tytuł:

A large xenusiid lobopod with complex appendages from the Lower Cambrian Chengjiang Lagerstatte

Autorzy:

Liu, J
Shu, D.
Han, J.
Zhang, Z.
Zhang, X.

Powiązania:

https://bibliotekanauki.pl/articles/21541.pdf

Data publikacji:

2006

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Chengjiang Lagerstatte
Lobopodia
China
arthropod
Jianshanopodia decora
large lobopod
lobopod
body length
Arthropoda
Xenusiidae
Cambrian
paleontology
Lower Cambrian

Opis:

A large lobopod, Jianshanopodia decora gen. et sp. nov., with body length (excluding appendages) about 220 mm from the Lower Cambrian Haikou section, near Kunming, Yunnan, southwest China, shows a mixture of characters, including features of the lobopod Xenusion Pompeckj, 1927, e.g., a large cylindrical body with annulations, stout and strong lobopod appendages each bearing bases of serial tubercles, and of Aysheaia Walcott, 1911, i.e., a pair of large frontal appendages. This suggests that the new genus might be a connecting link between Xenusion and Aysheaia. Besides, Jianshanopodia shares some features with the Early Cambrian stem group arthropod Pambdelurion Budd, 1997, and Kerygmachela Budd, 1993, e.g., the pairs of mid−gut diverticula, the possible presence of tail fan, the mouth cone, the frontal pharyngeal structures and the pharynax are surrounded by the bases of the large frontal appendages. However, compared with a series of segmentally arranged, imbricating, paddle−shaped, movable lateral flaps of both Pambdelurion and Kerygmachela, Jianshanopodia possesses distinct complex appendages with tree−like or lamellate branches. The discovery of this rare transitional form not only throws new light on the early diversification of lobopods, and may also have significance with respect to the origin of arthropods.

Źródło:

Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 73.

Tytuł:

Research on a scheme of generating ultra-wideband doublet signal based on the cross-gain modulation in a semiconductor optical amplifier

Autorzy:

Zhang, K.
Shao, J.

Powiązania:

https://bibliotekanauki.pl/articles/173646.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ultra-wideband
UWB
semiconductor optical amplifier
SOA
cross-gain modulation
XGM

Opis:

We propose a novel scheme for generating ultra-wideband doublet signal based on the cross-gain modulation effect in a semiconductor optical amplifier. This scheme requires only a semiconductor optical amplifier and an optical source. By using OptiSystem software, we simulate and analyze the effect of the input signal light power and wavelength, the pulse width and injection current on the generated doublet pulse. In addition, the optimal range of parameters are also given in the simulation process.

Źródło:

Optica Applicata; 2018, 48, 1; 127-135
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 74.

Tytuł:

The influence of hydraulic loading on biofilm properties in a subsurface wastewater infiltration system

Autorzy:

Zhang, L.
Yang, J.

Powiązania:

https://bibliotekanauki.pl/articles/205392.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

subsurface wastewater infiltration system
biofilms
hydraulic loading
spatial distribution
biofilm properties

Opis:

In this study, a pilot-scale subsurface wastewater infiltration system (SWIS) was deployed to study landscape water treatment. The goal of the study was to investigate the effects of hydraulic loading on pollutant removal and the spatial distribution of biofilm properties in SWIS. Results showed that the efficiencies of chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) removal degraded as hydraulic loading increased. Furthermore, quantities of the biofilm properties parameter s increased with the hydraulic loading. Polysaccharide and protein levels ranged from 560 to 1110 μg/g filler and 60 to 190 μg/g filler, respectively, at a hydraulic loading of 0.2 m/d. At a hydraulic loading of 0.4 m/d, the quantities of polysaccharide and protein ranged from 1200 to 3300 μg/g filler and 80 to 290 μg/g filler, respectively. Biofilm intensity and biofilm activity per unit weight decreased with the increase in hydraulic loading.

Źródło:

Archives of Environmental Protection; 2016, 42, 4; 70-79
2083-4772
2083-4810

Pojawia się w:

Archives of Environmental Protection

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 75.

Tytuł:

Perturbation to Noether Symmetry and Noether Adiabatic Invariants of Discrete Difference Variational Hamilton Systems

Autorzy:

Zhang, M.
Fang, J.

Powiązania:

https://bibliotekanauki.pl/articles/1419663.pdf

Data publikacji:

2012-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

02.20.Sv
11.30.-j
45.05.+x

Opis:

The perturbation to the Noether symmetry and the Noether adiabatic invariants of discrete difference variational Hamilton systems are investigated. The discrete the Noether exact invariant induced directly by the the Noether symmetry of the system without perturbation is given. The concept of discrete high-order adiabatic invariant is presented, the criterion of the perturbation to the Noether symmetry is established, and the discrete the Noether adiabatic invariant induced directly by the perturbation to the Noether symmetry is obtained. Lastly, an example is discussed to illustrate the application of the results.

Źródło:

Acta Physica Polonica A; 2012, 122, 1; 25-30
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 76.

Tytuł:

Microbial communities and relationship with biofilm spatial distributions in subsurface wastewater infiltration systems

Autorzy:

Zhang, L.
Yang, J.

Powiązania:

https://bibliotekanauki.pl/articles/207883.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

water treatment
wastewater infiltration system
DGGE
volatile suspended solids
oczyszczanie ścieków oczyszczanie wody
systemy infiltracji ścieków
lotne zawiesiny

Opis:

A pilot-scale subsurface wastewater infiltration system (SWIS) was designed for the treatment of polluted river water. The components of microbial communities have been identified and characterized and their dependences on some indicators of biofilm formation in the SWIS have been determined. The average efficiencies of COD, TN and removal were 43.3%, 28.8% and 79.6%, respectively. According to the denaturing gradient gel electrophoresis (DGGE) profile, high intensity and uniform bands were generated, indicating an abundant microbial community in each layer of the SWIS. Furthermore, the Shannon index analysis showed high correlation to the spatial distribution of microbial communities as well as the quantity of biofilm in each sample, which were characterized by measuring volatile suspended solids (VSS), phospholipids, proteins and polysaccharides. Sequencing of partial 16S rRNA gene fragments revealed that the composition of the total bacterial communities was dominated by Alphaproteobacteria, Gammaproteobacteria, Deltaproteobacteria, Pseudomonas, Bacillus, Flavobacteriaceae, TM-7, and other uncultured bacteria. These bacteria may contribute to nutrient removal in SWIS. +4 NH –N

Źródło:

Environment Protection Engineering; 2016, 42, 3; 55-69
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 77.

Tytuł:

Multi-AUV distributed task allocation based on the differential evolution quantum bee colony optimization algorithm

Autorzy:

Li, J.
Zhang, R.

Powiązania:

https://bibliotekanauki.pl/articles/259994.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

differential evolution quantum artificial bee colony algorithm
multi-AUV
contract net
task allocation

Opis:

The multi-autonomous underwater vehicle (AUV) distributed task allocation model of a contract net, which introduces an equilibrium coefficient, has been established to solve the multi-AUV distributed task allocation problem. A differential evolution quantum artificial bee colony (DEQABC) optimization algorithm is proposed to solve the multi-AUV optimal task allocation scheme. The algorithm is based on the quantum artificial bee colony algorithm, and it takes advantage of the characteristics of the differential evolution algorithm. This algorithm can remember the individual optimal solution in the population evolution and internal information sharing in groups and obtain the optimal solution through competition and cooperation among individuals in a population. Finally, a simulation experiment was performed to evaluate the distributed task allocation performance of the differential evolution quantum bee colony optimization algorithm. The simulation results demonstrate that the DEQABC algorithm converges faster than the QABC and ABC algorithms in terms of both iterations and running time. The DEQABC algorithm can effectively improve AUV distributed multi-tasking performance.

Źródło:

Polish Maritime Research; 2017, S 3; 65-71
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 78.

Tytuł:

Molecular dynamics simulation of histone H3 and H4 N-terminal tail conformation in the presence and absence of nucleosome core

Autorzy:

Zhang, R.
Erler, J.
Langowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/1954427.pdf

Data publikacji:

2014

Wydawca:

Politechnika Gdańska

Tematy:

histone tail
REMD
H4K 16 acetylation
nucleosome

Opis:

Histone N (C)-terminal tails play an important role in chromatin remodeling and gene regulation. Posttranslational modifications (PTMs) of histone tails are known to be correlated to distinct states of gene activity, but the molecular mechanism of these processes is largely unknown. PTMs alter the electrostatic environment and conformation of histone tails, as w ell as their interaction with other components. Here we performed extensive Replica Exchange Molecular Dynamics (REMD) simulations for the H4 and H3 tails, isolated and with inclusion of a nucleosome. Our results agree with the predictions of previous the teoretical studies for the secondary structure of isolated tails, but show strong dependence on the force field used. In the presence of the nucleosome, the secondary structure of histone tails is destabilized. Furthermore, H4K16 is found to insert into the DNA minor groove, whereas the acetylated H4K16 stays on the surface of DNA .

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 3; 281--288
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 79.

Tytuł:

Soft-tissue preservation in the Lower Cambrian linguloid brachiopod from South China

Autorzy:

Zhang, Z
Han, J.
Zhang, X.
Liu, J.
Shu, D.

Powiązania:

https://bibliotekanauki.pl/articles/20001.pdf

Data publikacji:

2004

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Lingulellotreta malongensis
Chengjiang Lagerstatte
soft tissue preservation
lophophore
brachiopod
linguloid brachiopod
China
Linguloidea
gastrointestinal tract
Cambrian
Lower Cambrian
paleontology

Opis:

The organization of the lophophore and the digestive system are recognized as two of the diagnostic characters in the definition of higher brachiopod taxa, and hence play a major role in their phylogenetic analysis, their structure, however, is very rarely fossilized. Here we describe and interpret specimens of the brachiopod Lingulellotreta malongensis, from the Lower Cambrian Chengjiang Lagerstätte (South China), one of the earliest known taxa of the Lingulellotretidae, in which lophophores and intact, U−shaped digestive tracts are extraordinarily well−preserved. The lophophore, with clearly preserved tentacles, corresponds to an early spirolophe developmental stage. The digestive tract consists of a mouth, esophagus, distended stomach, intestine and an anterior anus, and differs from that of the Chengjiang obolid Lingulella chengjiangensis by the presence of the dilated stomach and by the absence of a looped intestine as in Lingula. In addition, the relative sizes of the mantle and visceral cavities of Lingulellotreta malongensis also are described. These fossils demonstrate that by the Atdabanian brachiopods had already possessed advanced features, and suggest that a lophophore and a U−shaped intestine with an anterior anus are brachiopod plesiomorphies.

Źródło:

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

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 80.

Tytuł:

Trunk ornament on the palaeoscolecid worms Cricocosmia and Tabelliscolex from the Early Cambrian Chengjiang deposits of China

Autorzy:

Han, J
Liu, J.
Zhang, Z.
Zhang, X.
Shu, D.

Powiązania:

https://bibliotekanauki.pl/articles/23260.pdf

Data publikacji:

2007

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

Tabelliscolex hexagonus
Palaeoscolecida
Priapulida
Chengjiang deposit
Cricocosmia jinningensis
trunk ornament
fossil worm
China
Early Cambrian
Cambrian
Lower Cambrian
paleontology

Opis:

Cricocosmia jinningensis, one of the most abundant palaeoscolecid worms from the Lower Cambrian Chengjiang deposits of south China, was originally described as bearing double longitudinal rows of lateral conical sclerites on the trunk. New observation reveals that the ventral trunk bears an additional set of ventral sclerites while the lateral sclerites display a tubercle−bearing (inner surface) and net−like (outer surface) microstructure similar to that of Tabelliscolex hexagonus. These findings mean that: (1) Cricocosmia shows a dorso−ventral and antero−posterior differentiation in trunk ornament; (2) as seen from the microstructure, Cricocosmia is close to Tabelliscolex hexagonus, supporting the idea that lobopodians and arthropods, both of which show an upper capping layer in the outer sclerites, are more closely related than the palaeoscolecidans; and (3) the similarities among the scalids, pharyngeal teeth and the trunk spines of palaeoscolecidans are superficial. Tabelliscolex maanshanensis sp. nov., characterized by an inner concentric circlet of laminae in each tubercle of the lateral trunk plate, is proposed herein. Element mapping reveal that four known pathways of preservation can be found co−occurring in a single specimen of Cricocosmia or Tabelliscolex, which sheds new light on the preservation of the Chengjiang fossils.

Źródło:

Acta Palaeontologica Polonica; 2007, 52, 2
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 81.

Tytuł:

Energy Band and Absorption Coefficient of Quantum Dots in a Well Structure

Autorzy:

Zhang, P.
Lu, X.
Zhang, C.
Yao, J.

Powiązania:

https://bibliotekanauki.pl/articles/1419887.pdf

Data publikacji:

2012-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

73.21.La
73.63.Kv

Opis:

Building on the effective-mass envelope function theory, this paper focuses on the study of the energy band and the absorption coefficient of $InAs//In_{x}Ga_{1 - x}As$ quantum dots in a well (DWELL) structure. In contrast to $InAs//In_{0.15}Ga_{0.85}As$ quantum DWELL, the $InAs//In_{0.2}Ga_{0.8}As$ quantum DWELL has lower ground states. With the thickness of $In_{0.15}Ga_{0.85}As$ layer changing from 7 nm to 9 nm and $In_{0.2}Ga_{0.8}As$ layer changing from 9 nm to 12 nm, the calculation shows that their absorption coefficient spectra takes a red shift in the long-wave infrared and far-infrared ranges, respectively. Moreover, when the thickness of the $In_{x}Ga_{1 - x}As$ layer is defined as 9 nm, the absorption coefficient spectra of $InAs//In_{0.2}Ga_{0.8}As$ DWELL shows a obvious red shift comparing with that of $InAs//In_{0.15}Ga_{0.85}As$ DWELL.

Źródło:

Acta Physica Polonica A; 2012, 122, 1; 197-201
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 82.

Tytuł:

New compensation scheme of magneto-optical current sensor for temperature stability improvement

Autorzy:

Chen, J.
Li, H.
Zhang, M.
Zhang, Y.

Powiązania:

https://bibliotekanauki.pl/articles/221874.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

magneto-optical current sensor
normalization
Verdet constant
birefringence

Opis:

A novel magneto-optical current sensor (MOCS) with two sensing arms is proposed to improve the temperature stability. One of the arms, with a highly stable permanent magnet attached and orthogonal to the other one, is designed to provide a reference that follows the temperature characteristics of the sensing material. By a normalization operation between two arms, the temperature drift is compensated adaptively and a sensing output proportional to the measured current can be reached. A dual-input and dual-output structure is specially designed for the reference sensing arm to demodulate the DC Faraday rotation angle. This scheme compensates simultaneously two main temperature influence factors, the Verdet constant and linear birefringence. Validation tests were carried out and are discussed.

Źródło:

Metrology and Measurement Systems; 2012, 19, 3; 611-616
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 83.

Tytuł:

Research on Moral Judgment Competency of College Students in Mainland China with DIT-2

Autorzy:

Zhang, Qian
Thoma, Stephen J.

Powiązania:

https://bibliotekanauki.pl/articles/781259.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

DIT-2
moral judgment competenc
college student
Chinese participants

Opis:

The purpose of this paper was to (1) examine moral judgment competency of a sample of 811 Chinese college students from a Southern university in mainland China with DIT-2; and (2) test whether gender, education, major, academic performance, and one-child policy have significant effect on the participants’ moral judgment competency. Results show that the participants score high in both Personal Interest schema and Postconventional schema, while low in Maintaining Norms schema. Gender and major have significant effect on participants’ moral judgment competency in China, while education level, academic performance and one-child family have no significant effect on their moral judgment competency. Reasons are discussed in the paper.

Źródło:

Ethics in Progress; 2017, 8, 2; 80-96
2084-9257

Pojawia się w:

Ethics in Progress

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 84.

Tytuł:

Contribution on fluid inclusion abundance to activation of quartz flotation

Autorzy:

Yuan, Y.
Zhang, L.
Guan, J.
Zhang, C.
Wu, J.
Chen, Z.

Powiązania:

https://bibliotekanauki.pl/articles/110067.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

recovery
flotation
mineralogy
fluid Inclusions
fluid inclusion abundance

Opis:

In this study, comparative experiments were conducted on the recovery of quartz using flotation with different fluid inclusion abundances. A large number of fluid inclusions with various sizes have been found in natural quartz. Micrographs, inductively coupled plasma, electron probe microanalysis, homogenization temperature, Raman spectra, zeta potentials, X-ray photoelectron spectroscopy, scanning electron microscope, and energy dispersive spectrometer were used to characterize the fluid inclusions and quartz, as well as the adsorption tests and single mineral flotation experiments to investigate its floatability. The results demonstrated that it was more likely for quartz with higher fluid inclusion abundance to connect with Fe3+ sufficiently to achieve a high level of flotation recovery, due to the powerful collecting ability by sodium dodecyl sulphonate to Fe3+. Furthermore, the mechanism indicated that the adsorption between quartz and Fe3+ was a process of chemisorption.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 981-991
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 85.

Tytuł:

Comparative experiment study on nitrogen injection and free desorption of methane-rich bituminous coal under triaxial loading
Eksperymenty i badania porównawcze efektów wstrzykiwania azotu i swobodnej desorpcji na węglu bitumicznym o wysokiej zawartości metanu w warunkach obciążeń trójosiowych

Autorzy:

Zhang, L.
Ye, Z.
Tang, J.
Hao, D.
Zhang, C.

Powiązania:

https://bibliotekanauki.pl/articles/219975.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

wstrzykiwanie gazu
metan
tempo wypierania
swobodna desorpcja
gas injection
methane
displacement ratio
free desorption

Opis:

As a kind of associated geological gas, coalbed methane (CBM) is mainly adsorbed in the coal seam. The coal-methane adsorption phenomenon can be described by Langmuir monolayer adsorptio n model, BET multilayer adsorption model and the Theory of Volume Filling of Micropore (TVFM), whereas the binary gas adsorption phenomenon can be described by the extended Langmuir Model. For the CBM in the low permeability coal seam, the amount of gas released by direct drainage is relatively limited, which cannot eliminate the gas explosion and outburst hazards. Gas injection is an effective method to promote methane drainage. In this paper, the free desorption and nitrogen injection displacement experiments are comparatively analyzed, which allows verifying the effectiveness of nitrogen injection’s enhancement to gas drainage. The experiment of injecting nitrogen gas into the coal body shows that the coal fracture can be maintained or expanded by the injected gas pressure so that more methane can be released. The nitrogen injection has a higher time efficiency than that of free desorption as well. The displacement ratio of N2/CH4 is in the range of 1-3. Both the injection pressure and confining pressure affect the displacement ratio. The analysis of the desorbed gas components shows that the relationship between the methane component and gas flooding time is an “inverted S” shape curve, and the appropriate time for the methane collection can be inferred by the time interval of the rapid decline of the curve.
Metan zawarty w złożu węgla występuje w głównej mierze w postaci zaadsorbowanej, jako gaz związany. Zjawisko adsorpcji metanu na węglu opisuje model adsorpcji jednowarstwowej Langmuira, model adsorpcji wielowarstwowej BET oraz teoria objętościowego wypełniania mikroporów. Z kolei procesy desorpcji mieszanin dwóch gazów opisuje rozszerzony model Langmuira. W przypadku metanu zawartego w złożu węgla o niskiej przepuszczalności, ilość gazu uwalnianego poprzez proste odgazowanie jest ograniczona i wciąż nie eliminuje ryzyka wybuchu gazu oraz wyrzutu skał i gazu. Wstrzykiwanie gazów jest jedną ze skutecznych metod odgazowania. W pracy tej przeprowadzono badanie porównawcze rezultatów swobodnej desorpcji gazu oraz wstrzyknięcia do złoża azotu, w celu zademonstrowania skuteczności odgazowania poprzez wprowadzenie azotu. Eksperyment polegający na wstrzykiwaniu azotu do calizny węglowej pokazuje możliwość zachowania lub powiększenia pęknięć w strukturze węgla pod działaniem ciśnienia wstrzykiwanego gazu, co umożliwi uwolnienie większych ilości metanu. Ponadto, wprowadzenie azotu okazuje się rozwiązaniem skuteczniejszym w dłuższym okresie czasu niż swobodna desorpcja. Stosunek wypierającego metan N2 do CH4 wynosi w przybliżeniu 1:3. Zarówno ciśnienie wstrzykiwanego gazu jak i wielkość ciśnienia złożowego mają wpływ na tempo wypierania metanu przez azot. Analiza składników desorbowanego gazu wskazuje, że zależność ilości metanu od czasu wypływu gazu opisywana jest na wykresie krzywą w postaci odwróconej litery S, zaś odpowiedni czas na odzysk metanu odczytujemy jako przedział odpowiadający nagłemu obniżeniu widocznemu na wykresie.

Źródło:

Archives of Mining Sciences; 2017, 62, 4; 911-928
0860-7001

Pojawia się w:

Archives of Mining Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 86.

Tytuł:

An Empirical Cross-Cultural Study of Moral Judgment Development in Mainland China

Autorzy:

Zhang, Qian
Thoma, Stephen J.

Powiązania:

https://bibliotekanauki.pl/articles/781141.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

DIT2
Chinese participants
morality
personal interest
maintaining norms
postconventional judgment

Opis:

The Chinese version of Rest’s Defining Issues Test II was administered to 113 subjects in Mainland China (n=113, average age=34.7). The scores on development of moral judgment were compared with those of the online mega sample of American participants from 2011 to 2014. Results are as followings: 1. Chinese participants show the same pattern with Americans by both sex and education. 2. Chinese participants show different pattern from Americans by religious orthodoxy and humanitarian. 3. Chinese participants score higher in meaningless items than Americans. 4. Chinese participants score higher in stage 3 while Americans score higher in stage 4. The authors draw the conclusions as follows: with Chinese participants, 1. There is a significant relationship between education and moral judgment developmental index scores. 2. There is also a significant relationship between sex and moral judgment developmental index scores. 3. There shows no significant relationship between religious orthodoxy and moral judgment developmental index scores. 4. It is more difficult for them to tell the meaningless items in DIT2. 5. Since Chinese culture thinks less of laws and norms, Chinese participants favour personal interest schema more than maintaining norms schema.

Źródło:

Ethics in Progress; 2016, 7, 1; 228-245
2084-9257

Pojawia się w:

Ethics in Progress

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 87.

Tytuł:

Design and Experiment on the Compact, Portable Pulse Forming Line

Autorzy:

Xia, L.
Shi, J.
Chen, D.
Zhang, H.
Zhang, L.
Deng, J.

Powiązania:

https://bibliotekanauki.pl/articles/1807991.pdf

Data publikacji:

2009-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

84.70.+p
77.90.+k

Opis:

Some research has been done on making the compact, portable pulse forming line. A kind of ceramic and a kind of newly developed composite polymer are both used as the dielectric of the planar pulse forming line. The ceramic's dielectric constant ranges from 200 to 600 and the composite polymer's dielectric constant ranges from 100 to 200. It is easier to manufacture the large composite polymer dielectric bulks than to manufacture the ceramic bulks. In the experiments, using the large composite polymer bulk as the dielectric, the planar Blumlein line generated the pulse up to 100 kV with duration 90 ns. Using the ceramic bulk as the dielectric, the planar line generated the voltage pulse up to 60 kV with duration 92 ns.

Źródło:

Acta Physica Polonica A; 2009, 115, 6; 1192-1193
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 88.

Tytuł:

A fault diagnosis method for substation grounding grid based on the square-wave frequency domain model

Autorzy:

Zhang, P.-H.
He, J.-J.
Zhang, D.-D.
Wu, L.-M.

Powiązania:

https://bibliotekanauki.pl/articles/221635.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

square-wave
frequency characteristics
grounding grid
fault diagnosis

Opis:

Current methods of fault diagnosis for the grounding grid using DC or AC are limited in accuracy and cannot be used to identify the locations of the faults. In this study, a new method of fault diagnosis for substation grounding grids is proposed using a square-wave. A frequency model of the grounding system is constructed by analyzing the frequency characteristics of the soil and the grounding conductors into which two different frequency square-wave sources are injected. By analyzing and comparing the corresponding information of the surface potentials of the output signals, the faults of the grounding grid can be diagnosed and located. Our method is verified by software simulation, scale model experiments and field experiments.

Źródło:

Metrology and Measurement Systems; 2012, 19, 1; 63-71
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 89.

Tytuł:

A new sufficient schedulability analysis for hybrid scheduling

Autorzy:

Zhang, F.
Zhai, Y.
Liao, J.

Powiązania:

https://bibliotekanauki.pl/articles/330353.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

scheduling algorithm
real time system
schedulability analysis
preemptive scheduling
earliest deadline first
fixed priority
algorytm szeregowania
system czasu rzeczywistego
analiza szeregowalności

Opis:

Earliest deadline first (EDF) and fixed priority (FP) are the most commonly used and studied scheduling algorithms for real-time systems. This paper focuses on combining the EDF and FP strategies in one system. We provide a new sufficient schedulability analysis for real-time hybrid task systems which are scheduled by EDF and FP. The proposed analysis has a polynomial time complexity and no restrictions on task parameters, where the relative deadline of each task could be less than, equal to, or greater than its period. By extensive experiments, we show that our proposed analysis significantly improves the acceptance ratio compared with the existing results of the sufficient schedulability test for hybrid scheduling systems.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2016, 26, 3; 683-692
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 90.

Tytuł:

A novel multi-objective discrete particle swarm optimization with elitist perturbation for reconfiguration of ship power system

Autorzy:

Zhang, L.
Sun, J.
Guo, C.

Powiązania:

https://bibliotekanauki.pl/articles/260215.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

shipboard power system
reconfiguration
multi-objective
discrete PSO
elitist perturbation

Opis:

A novel multi-objective discrete particle swarm optimization with elitist perturbation strategy (EPSMODPSO) is proposed and applied to solve the reconfiguration problem of shipboard power system(SPS). The new algorithm uses the velocity to decide each particle to move one step toward positive or negative direction to update the position. An elitist perturbation strategy is proposed to improve the local search ability of the algorithm. Reconfiguration model of SPS is established with multiple objectives, and an inherent homogeneity index is adopted as the auxiliary estimating index. Test results of examples show that the proposed EPSMODPSO performs excellent in terms of diversity and convergence of the obtained Pareto optimal front. It is competent to solve network reconfiguration of shipboard power system and other multi-objective discrete optimization problems.

Źródło:

Polish Maritime Research; 2017, S 3; 79-85
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 91.

Tytuł:

Growth and Characterization of Vanadate Laser Crystals

Autorzy:

Yu, H.
Zhang, H.
Wang, J.

Powiązania:

https://bibliotekanauki.pl/articles/1399465.pdf

Data publikacji:

2013-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.10.Fq
42.55.Px

Opis:

Based on the invention and widely application of the Czochralski pulling method, vanadate crystals have been grown and commercialized in recent decades. In this paper, the growth and characterization of a series of neodymium doped vanadate crystals have been reviewed, including $Nd:YVO_4$, $Nd:GdVO_4$, and $Nd:LuVO_4$. The excellent thermal-mechanical and laser property make them to be used in many respects.

Źródło:

Acta Physica Polonica A; 2013, 124, 2; 301-304
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 92.

Tytuł:

Analysis of 50-year wind data of the Southern Baltic Sea for modelling coastal morphological evolution – a case study from the Darss-Zingst Peninsula

Autorzy:

Zhang, W.
Harff, J.
Schneider, R.

Powiązania:

https://bibliotekanauki.pl/articles/48896.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

Baltic Sea
coastal morphological evolution
coastline change
Darss-Zingst Peninsula
modelling
morphodynamic model
sea level
statistical analysis
wind
wind direction
wind speed

Opis:

High-resolution wind series in the southern Baltic Sea for the period of 1958–2007 are analysed to generate representative climate input conditions for a multi-scale morphodynamic model to simulate decadal-to-centennial coastline change. Four seasonal wind classes, each characterized by a predominant distribution of wind direction and speed, are derived from statistical analysis. Further calibration of this statistical description is done by sensitivity studies of the model to generate similar coastline changes of the Darss-Zingst peninsula as the measured data for the last century. The coastline change of this area is then projected for the next 300 years based on four different climate scenarios, through which impacts of accelerated sea level rise and storm frequency on the long-term coastline change are quantified.

Źródło:

Oceanologia; 2011, 53, (1-TI)
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 93.

Tytuł:

Effects of pretreated ozone and modified atmosphere packaging on the quality of fresh-cut green asparagus

Autorzy:

An, J.
Zhang, M.
Lu, Q.

Powiązania:

https://bibliotekanauki.pl/articles/25240.pdf

Data publikacji:

2006

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

fresh-cut green asparagus
Asparagus officinalis
ozone
modified atmosphere packaging
pretreatment
lignifying
packaging
quality
cell wall composition
asparagus

Źródło:

International Agrophysics; 2006, 20, 2
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 94.

Tytuł:

Auxiliary intelligent operating system for dragline stripping equipment in surface mining

Autorzy:

Sun, J.-D.
Zhang, R.-X.

Powiązania:

https://bibliotekanauki.pl/articles/88889.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

dragline stripping
intelligent operating system
operational efficiency

Opis:

In order to improve operation skill of the operators, the design of the auxiliary intelligent operating system of the dragline was studied. Whereby the gyroscopes incorporated in smartphone and data sequence filter algorithm, the automatic collection function of operation cycle, the rotation angle and other parameters of the dragline are attained. In line with the relations among the rotation angle of equipment operation, time-spent and the acceleration, the ratio of the acceleration and deceleration rotation angle in full load rotation and non-loaded return stage are acquired respectively. The function of bucket in rotation was realized. Comprehensive score calculation standard of the technique level of the dragline-based operation was developed, and the function of automatic checking the operation level was effectuated. Field experiment results indicated that the operators’ faults are markedly reduced as the auxiliary intelligent operating system is employed. By using the system the operation behavior of low power slow rotation in rain, snow, low atmospheric pressure and other severe weather conditions can be reduced, assuring all-weather efficient and safe operation of dragline.

Źródło:

Mining Science; 2017, 24; 251-266
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 95.

Tytuł:

Surface probability model for estimation of size distribution on a conveyor belt

Autorzy:

Zhang, Z
Yang, J.
Dou, D.

Powiązania:

https://bibliotekanauki.pl/articles/109982.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

size distribution
surface probability model
conveyor belt
particles

Opis:

Estimation of size distribution by image analysis is a key issue in mineral engineering. However, only the surface information of ore piles can be captured, which is a headache problem in this field while only a few researchers pay attention to this problem. A new surface probability model was proposed for estimation of size distribution on a conveyor belt based on the Chavez Model in this investigation. This model was tested and verified to have smaller errors in single size fraction but have bigger errors in multiple size fractions. Several error trends were found and a correction factor was introduced to correct the higher errors. A series of linear equations were developed to calculate this specific correction factor according to Dm (average particle size) and the height of pile. Therefore, empirical probability can be estimated by the specific correction factor and calculated probability, and the surface information of ore piles can be converted into the global information of piles.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 2; 591-606
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 96.

Tytuł:

Performance analysis of variable speed multiphase induction motor with pole phase modulation

Autorzy:

Liu, H.
Wang, J.
Zhang, Z.

Powiązania:

https://bibliotekanauki.pl/articles/140991.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

induction motor (IM)
pole phase modulation (PPM)
efficiency
FEM

Opis:

The pole phase modulation (PPM) technique is an effective method to extend speed range and torque capabilities for an integrated starter and hybrid electric vehicles applications. In this paper, the five pole-phase combination types of a multiphase induction motor (IM) with 36 stator slots and 36 stator conductors are presented and compared quantitatively by using the time-stepping finite element method (TS-FEM). The 36 stator conductors of the proposed multiphase IM are fed by a 36 leg inverter and the current phase angle and amplitude of each stator conductor can be controlled independently. This paper focuses on the winding connection, the PPM technique and the performance comparative analysis of each pole-phase combination types of the proposed multiphase IM. The flux distribution, air-gap flux density, output torque, core losses and efficiency of five pole-phase combination types have been investigated.

Źródło:

Archives of Electrical Engineering; 2016, 65, 3; 425-436
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 97.

Tytuł:

The Interaction of Water with Glycine: A Combined Inelastic Neutron Scattering and Raman Spectra Studies

Autorzy:

Zhang, P.
Zhang, Y.
Han, S.
Yan, Q.
Li, J.

Powiązania:

https://bibliotekanauki.pl/articles/2044762.pdf

Data publikacji:

2006-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

36.20.Ng
87.64.Je
25.40.Fq
82.30.Rs

Opis:

The vibrational dynamics of water around glycine was investigated by using Raman spectroscopy and inelastic neutron scattering. Experiments of deuterated glycine versus deuterium were performed as comparison. The study shows that for glycine, the exchange of proton-deuteron on the active NH$\text{}_{3}^{+}$ side was easy, whereas there was hardly exchange on the CH$\text{}_{2}$ side. Comparing different proportion of glycine vs. water molecules we obtained that the presence of water hardly changes the main features of glycine illustrating its hydrophobic character. The intralayer hydrogen bonds of glycine crystal are difficult to be replaced due to its stronger bond than water.

Źródło:

Acta Physica Polonica A; 2006, 109, 3; 399-404
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 98.

Tytuł:

A new feature extraction method for gear fault diagnosis and prognosis
Nowa metoda diagnozowania i prognozowania uszkodzeń przekładni z wykorzystaniem ekstrakcji cech

Autorzy:

Zhang, X.
Kang, J.
Bechhoefer, E.
Zhao, J.

Powiązania:

https://bibliotekanauki.pl/articles/301191.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

degradacja
diagnoza uszkodzeń
prognozowanie uszkodzeń
wskaźnik wstęgi bocznej
Narrowband Interference Cancellation
degradation
fault diagnosis
fault prognosis
sideband index

Opis:

Cechy odporne (robustfeatures) mają krytyczne znaczenie w trakcie śledzenia procesu degradacji przekładni. Stanowią one kluczowy czynnik w procesie diagnozowania i prognozowania uszkodzeń. Fakt ten stwarza w badaniach naukowych potrzebę ekstrakcji pożądanych cech. W niniejszej pracy wykorzystano nową metodę, tzw. metodę eliminacji zakłóceń wąskopasmowych (NarrowbandInterferenceCancellation), za pomocą której można wytłumić składową wąskopasmową, a wzmocnić składową impulsową, co ułatwia wykrywanie uszkodzeń przekładni. Metoda ta pozwala poprawić stosunek sygnału do szumu w szeregu impulsów związanym z częstotliwością charakteryzującą uszkodzenie przekładni. Skuteczność przedstawionej metody można wykazać za pomocą badań typu „pracuj do awarii” (run-to-failure) . Na podstawie synchronicznego sygnału wału wysokoobrotowego, z sygnałów przetwarzanych za pomocą metody eliminacji zakłóceń wąskopasmowych ekstrahuje się wskaźnik wstęgi bocznej (Sideband Index). Cecha ta ma lepszy trend degradacji niż tradycyjny wskaźnik wstęgi bocznej ekstrahowany bezpośrednio z sygnału uśrednionego synchronicznie w czasie. Porównanie cech wyodrębnionych w różnych procesach ekstrakcji dowodzi skuteczności opracowanej metody.
Robust features are very critical to track the degradation process of a gear. They are key factors for implementing fault diagnosis and prognosis. This has driven the need in research for extracting good features. This paper used a new method, Narrowband Interference Cancellation, to suppress the narrow band component and enhance the impulsive component enabling the gear fault detection easier. This method can improve the signal to noise ratio of impulse train associated with the gear fault frequency. A run-to-failure test is used to demonstrate the method’s effectiveness. Based on the time synchronous signal of high speed shaft, Sideband Index is extracted from the signals processed by Narrowband Interference Cancellation. This feature has good degradation trend than traditional Sideband Index extracted from the time synchronous average signal directly. Comparison of features based on different extraction process proves the effectiveness of developed method.

Źródło:

Eksploatacja i Niezawodność; 2014, 16, 2; 295-300
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 99.

Tytuł:

Relative clauses as a benchmark for Minimalist parking

Autorzy:

Graf, T.
Monette, J.
Zhang, C.

Powiązania:

https://bibliotekanauki.pl/articles/103867.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Instytut Podstaw Informatyki PAN

Tematy:

parsing
sentence processing
minimalist grammars
memory usage
relative clauses
promotion analysis
English
East Asian

Opis:

Minimalist grammars have been used recently in a series of papers to explain well-known contrasts in human sentence processing in terms of subtle structural differences. These proposals combine a top-down parser with complexity metrics that relate parsing difficulty to memory usage. So far, though, there has been no large-scale exploration of the space of viable metrics. Building on this earlier work, we compare the ability of 1,600 metrics to derive several processing effects observed with relative clauses, many of which have been proven difficult to unify. We show that among those 1,600 candidates, a few metrics (and only a few) can provide a unified account of all these contrasts. This is a welcome result for two reasons: First, it provides a novel account of extensively studied psycholinguistic data. Second, it significantly limits the number of viable metrics that may be applied to other phenomena, thus reducing theoretical indeterminacy.

Źródło:

Journal of Language Modelling; 2017, 5, 1; 57-106
2299-856X
2299-8470

Pojawia się w:

Journal of Language Modelling

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 100.

Tytuł:

Decision-making of spare subsea trees with multi-restrictive factors in deepwater development
Podejmowanie decyzji dotyczących wykorzystania zapasowych podmorskich głowic eksploatacyjnych w procesie zagospodarowywania obszarów podmorskich. Model uwzględniający liczne czynniki ograniczające

Autorzy:

Chen, J.
Duan, M.
Zhang, Y.

Powiązania:

https://bibliotekanauki.pl/articles/301887.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

statek interwencyjny
model konserwacji
czynnik ograniczający
zapotrzebowanie na części zapasowe
podmorska głowica eksploatacyjna
prognozowanie pogody
intervention vessel
maintenance model
restrictive factors
spare demand
subsea tree
weather prediction

Opis:

In order to quantify the influential factors of subsea trees’ maintenance proactively, multiple restrictive factors first are elaborated, such as locale meteorological conditions (i.e. weather), transport resources, heavy intervention vessels, maintenance technicians, spare trees and so on. Then, the focus is on three vital factors: weather, intervention vessel and spare trees. These restrictions dramatically impact the cost and accessibility of maintenance. For the inaccessible duration of significant wave height in weather model for computing non-feasibility days, we utilized the statistic data from the ERA Interim dataset. An analytical model is established to simplify the calculation of maintenance costs. As the predictive maintenances are seldom performed in subsea field, the built maintenance model only considers the corrective maintenance. Results show that hostile weather as well as the shortage of adequate spare subsea trees can induce severe downtime cost. The comparison of two contractual alternatives indicates that the better way to reduce the maintenance cost is to make the intervention vessel available enough. It is significant to provide quantitative views of subsea maintenance and to supply a method for the decision-making of spare subsea trees with multiple restrictive factors from the proposed model.
Aby móc dokonać aktywnej oceny ilościowej liczących się czynników utrzymania podmorskich głowic eksploatacyjnych, najpierw zbadano wiele czynników ograniczających, takich jak lokalne warunki pogodowe oraz dostępność środków transportu, statków interwencyjnych o dużym tonażu, techników utrzymania ruchu, zapasowych głowic eksploatacyjnych, itd. Następnie skupiono uwagę na trzech kluczowych czynnikach: pogodzie oraz dostępności statku interwencyjnego oraz dostępności zapasowych głowic eksploatacyjnych. Ograniczenia związane z tymi czynnikami znacząco wpływają na koszty i możliwości konserwacji. Do obliczenia okresów,w których wysokie fale uniemożliwiają prace konserwacyjne wykorzystano dane statystyczne pochodzące z bazy danych ERA Interim. Stworzono model analityczny pozwalający na uproszczenie obliczeń kosztów utrzymania ruchu. Ponieważ na podmorskich polach naftowych rzadko wykonuje się zabiegi predykcyjnego utrzymania ruchu, skonstruowany przez nas model utrzymania ruchu uwzględnia jedynie utrzymanie naprawcze. Wyniki pokazują, że niekorzystne warunki pogodowe, jak również brak odpowiednich zapasowych głowic eksploatacyjnych mogą generować wysokie koszty związane z przestojami. Porównanie dwóch alternatyw pokazuje, że najlepszym sposobem na zmniejszenie kosztów utrzymania ruchu jest zapewnienie dostatecznej dostępności statku interwencyjnego. Proponowany model umożliwia ilościowy ogląd utrzymania ruchu w warunkach podmorskich i może być wykorzystany w procesie podejmowania decyzji dotyczących wykorzystania zapasowych podmorskich głowic eksploatacyjnych uwzględniającym wiele czynników ograniczających.

Źródło:

Eksploatacja i Niezawodność; 2016, 18, 4; 590-598
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce