Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Li, S" wg kryterium: Autor

  Lista filtrów
Wyrównaj
Wyświetlanie 1-100 z 184
Tytuł:
Self-assembling micelles obtained from PLLA/PEG and PDLA/PEG block copolymers in aqueous solutions
Autorzy:
Wu, X
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/285984.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polylactide
polyethylene glycol
stereocomplexation
self-assembly
anisotropy
Opis:
A series ofpolylactide-poly(ethylene glycol) (PLA- PEG) block copolymers were synthesized by ring-opening polymerization of L- or D-lactide in the presence of mono- or dihydroxyl PEG, using nontoxic zinc lactate as catalyst. Micelles were then prepared by direct dissolution of the obtained copolymers in aqueous medium without heating or using any organic solvents. Aqueous gel permeation chromatography and dynamic light scattering measurements were carried out to characterize the resulting micelles. Generally, mixed micelles containing both PLLA/PEG and PDLA/PEG copolymers appear lager and more compact compared to single ones. However, the size of mixed micelles is smaller than that of single ones which exhibit an anisotropic structure since stereocomplexation disfavors the formation of anisotropic micelles. The copolymer parameters such as structures, molar mass and PEG fraction strongly influence the formation of anisotropic micelles, and thus lead to various micellar sizes.
Źródło:
Engineering of Biomaterials; 2012, 15, 113; 6-8
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Simulation Research on Chaotic Behavior of Parabolic and Elliptic Underwater Acoustic Ray Equations
Autorzy:
Li, S
Li, X
Powiązania:
https://bibliotekanauki.pl/articles/1400284.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.30.+m
05.45.Pq
Opis:
The chaotic behavior of underwater ray system is studied. Because the parabolic equation is an approximation under small ray angle with respect to horizontal, the elliptic equation system is considered here besides the parabolic system. We pay main attention to the interval of large ray angle. A comparison between these two forms of system is performed. We find that when the ray angle is not large (θ_0=0° - 18°), the two systems show the same qualitative behavior. However, in interval of large ray angle (θ_0 ≥ 19°), if the perturbation strength is not very small, e.g. δ=0.05, the parabolic system shows regular motion, while the elliptic system exhibits chaotic behavior in most of this interval except a few quasiperiodic islands studded in the chaotic ocean. Dynamical behaviors of the two systems show surprising difference.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 53-57
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Environmental Preferences on Public Supporting for the River Ecosystem Restoration Program in China
Wpływ uwarunkowań środowiskowych na społeczne poparcie dla Programu odnowy środowiska rzecznego w Chinach
Autorzy:
Zhang, Y.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/371244.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:
river restoration
public preference
environmental awareness
city planning
water quality
urbanization
China
restytucja środowiska wodnego
preferencje społeczne
świadomość ekologiczna
planowanie miast
jakość wody
urbanizacja
Chiny
Opis:
Restoration of the urban river system is urgently needed as urban river pollution is becoming an important environmental problem in China. Apart from the technical challenge, explicitly including the local residents’ preferences toward ecosystem management and restoration often is critical for municipal planners and policy implementation. This study used a contingent valuation method to estimate the public preferences for supporting urban river restoration in Hangzhou and Nanjing, China. The results show that environmental preferences including perception, beliefs and past behavior were better explanatory variables than socio-demographic characteristics for explaining people’s support for ecosystem restoration actions. But the respondents’ demand and supply on environment goods are mismatch. People want better environments goods but they are unwilling to make an effort to build the environments. We also find that the average conjectural payment for the restoration project is only 36 Yuan RMB per capital. Efforts to assess and foster support for urban ecosystem restoration should be pay more attentions to the public’s perception, beliefs and past behavior.
Odnowa środowiska rzecznego na terenach zurbanizowanych staje się w Chinach ważnym problemem środowiskowym, z uwagi na wysoki poziom zanieczyszczeń. Oprócz wyzwań technicznych, wyraźne uwzględnienie preferencji lokalnych społeczności odnoszących się do zarządzania środowiskiem i jego restytucji stanowi istotne wyzwanie dla miejskich planistów i wdrażanych programów. W tym artykule zastosowano metodę wyceny warunkowej w celu określenia społecznych preferencji związanych z wdrażanym programem odnowy środowiska rzecznego w Hangzou i Najing w Chinach. Otrzymane wyniki pokazują, że preferencje środowiskowe (uwzględniające percepcję, przekonania i dotychczasowe wzorce zachowania) okazały się być trafniejszymi zmiennymi wyjaśniającymi, niż wskaźniki społeczno-demograficzne, w kontekście wyjaśniania poziomu społecznego wsparcia dla działań podejmowanych na rzecz restytucji środowiska. Zarazem popyt i podaż respondentów na dobra środowiskowe rozmijają się. Ludzie oczekują lepszej jakości środowiska, ale nie są zainteresowani podejmowaniem osobistych działań w tym kierunku. Okazało się także, że przeciętny poziom hipotetycznego finansowego wsparcia respondentów dla działań na rzecz środowiska wynosi zaledwie 36 yuanów RMB za kapitał. Wysiłki w celu oceny i kształtowania wsparcia dla odbudowy środowiska powinny w większym stopniu zwracać uwagę na społeczny odbiór podejmowanych działań, ludzkie przekonania i dotychczasowe wzorce zachowania.
Źródło:
Problemy Ekorozwoju; 2014, 9, 2; 55-64
1895-6912
Pojawia się w:
Problemy Ekorozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and technological aspects of surface engineering for adhesion enhancement of polymers and composites
Teoretyczne i technologiczne aspekty połączeń materiałów polimerowych i ich kompozytów oraz kryteria ich oceny
Autorzy:
Gutowski, V. S.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/176200.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polymers
composites
thermoplastic olefins (TPOs)
surface modification
molecular brushes
adhesion
adhesive bonding
coating
polimery
kompozyty
olefiny termoplastyczne
modyfikacja powierzchni
szczotki molekularne
adhezja
wiązania adhezyjne
powłoki
Opis:
Polymers and lightweight composites rapidly replace metals in high-tech engineering applications in automotive, aerospace, shipbuilding, civil and other engineering applications. Due to chemical inertness, hydrophobicity, surface contamination and migrating functional and processing additives, most polymers require surface modification to ascertain high strength and reliability of bonded products. In structural bonding, the key objective is creation of permanent bond between bonded elements. The overarching aim is creating such strong adhesion forces between bonded material and adhesive that the bond becomes unbreakable and the adhesive or substrate become the weakest element of the structure, thus enabling application of verifiable engineering design principles ascertaining reliable performance of structures throughout entire service life under the influence of all static, dynamic and environmental loads and impacts. Theoretical and engineering aspects of the problem, including criteria for attaining such bond properties, including experimental data, are comprehensively discussed in this paper. Examples of industrial applications of the technology are provided.
W wielu gałęziach techniki, m.in. lotnictwie, okrętownictwie i budownictwie, zwiększa się ciągle zastosowanie polimerów i kompozytów lekkich. Wykonanie z polimerów wyrobów złożonych często wymaga klejenia. Polimery są zwykle obojętne chemicznie, natomiast elementy wykonane z polimerów mają zanieczyszczoną powierzchnię i zawierają różne mikrododatki. Stąd niezbędna jest modyfikacja ich powierzchni w celu zapewnienia odpowiedniej wytrzymałości łączonych elementów. Podstawowym zagadnieniem jest zapewnienie trwałego połączenia pomiędzy składowymi elementami. Konieczne jest wytworzenie określonej siły adhezji pomiędzy warstwami kleju i materiałem – polimerami. Dla zapewnienia nierozrywalności połączenia przyjmuje się, że klej lub materiał stanowią najsłabsze elementy konstrukcji. Umożliwi to zachowanie odpowiednich właściwości użytkowych klejonych elementów w warunkach oddziaływania obciążeń statycznych i dynamicznych. W pracy przedstawiono rozważania teoretyczne i praktyczne dotyczące tego zagadnienia. Przedstawiono kryteria oceny wytworzonych połączeń, dane doświadczalne oraz przykłady ich zastosowania w przemyśle.
Źródło:
Advances in Manufacturing Science and Technology; 2014, 38, 4; 5-21
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the maritime communication cryptographic chip’s compiler optimization
Autorzy:
Li, S.
Dai, Z. B.
Powiązania:
https://bibliotekanauki.pl/articles/259239.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
maritime communication encryption system
cryptographic SOC
compiler frontend
loop unrolling
Opis:
In the process of ocean development, the technology for maritime communication system is a hot research field, of which information security is vital for the normal operation of the whole system, and that is also one of the difficulties in the research of maritime communication system. In this paper, a kind of maritime communication cryptographic SOC(system on chip) is introduced, and its compiler framework is put forward through analysis of working mode and problems faced by compiler front end. Then, a loop unrolling factor calculating algorithm based on queue theory, named UFBOQ (unrolling factor based on queue), is proposed to make parallel optimization in the compiler frontend with consideration of the instruction memory capacity limit. Finally, the scalar replacement method is used to optimize unrolled code to solve the memory access latency on the parallel computing efficiency, for continuous data storage characteristics of cryptographic algorithm. The UFBOQ algorithm and scalar replacement prove effective and appropriate, of which the effect achieves the linear speedup.
Źródło:
Polish Maritime Research; 2017, S 2; 50-65
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of moisture content in coal dust on filtration and cleaning performance of filters
Autorzy:
Li, J.
Li, S.
Zhou, F.
Powiązania:
https://bibliotekanauki.pl/articles/110692.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal dust
moisture content
filtration
compressibility
adhesive force
Opis:
A large amount of fugitive coal dust is generated during the mining, transportation, and processing of coal. The moisture content of the coal dust has a significant influence on the dust collection performance of filters, although relatively few studies on this phenomenon exist. This study deals with six groups of coal dust samples with moisture contents ranging from 0 to 12 wt.% and tested the pressure drop as the coal dust was deposited onto three different types of filters. The specific resistance, compression coefficient, and porosity of the coal dust cake were analyzed, and the cake/filter adhesive force was tested using the reverse flow cleaning method. This research demonstrates that the influence of the moisture content on the specific resistance, compression coefficient, and porosity of the coal dust cake can be divided into two phases (according to the critical moisture content of 4 wt.%): first, as the moisture content increased from 0 to 4 wt.%, the cake resistance and compression coefficient increased and the cake porosity decreased; and second, as the moisture content increased from 4 to 12 wt.%, the cake resistance and compression coefficient decreased and the porosity increased. The coated and repellent filters possessed a lower adhesive force on the coal dust cake than the conventional filter. The comparison of all three of the filters revealed that the adhesive force between the repellent filter and the dust cake was the least sensitive to the moisture content.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 365-379
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Breakdown Mechanism of Fabrication of Micro Channels in Fused Silica Substrates with ps Laser Pulses
Autorzy:
Li, S.
Bai, Z.
Qin, S.
Powiązania:
https://bibliotekanauki.pl/articles/1400288.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.50.Jm
52.40.Hf
61.80.-x
42.62.-b
Opis:
A new microchannel fabrication technology for fused silica substrate is presented. A mode-locked laser was used to fabricate straight microchannels in a fused silica substrate by laser plasma-induced plasma. The depth of the channels is up to 5 mm and there are no thermal cracks around the channel. We studied the ionization mechanism of optical breakdown formed by laser pulses and discussed the optical breakdown threshold. A mechanism is proposed to explain the formation of the microchannels and the characteristics of the microchannels are analyzed through the laser pulse characteristics.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 67-72
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo based angular analysis of multiple scattered photons for underwater optical imaging
Autorzy:
Li, S.
Wang, R.
Chen, G.
Powiązania:
https://bibliotekanauki.pl/articles/173322.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
underwater imaging
turbid media
Monte Carlo method
multiple scattering
Opis:
Image contrast and visibility associated with underwater optical imaging systems are usually degraded by the absorbing and scattering effects of turbid waters. To improve the image contrast, laser-range-gate has been widely applied to underwater optical imaging systems. The work of Katsev et al. (Appl.Opt. 38(33), 1999, pp. 6849–6858) shows that the contrast of a shadow image is greater than that of the object image. The present paper outlines a Monte Carlo based simulation method of image formation for underwater optical imaging. It is found that the contrast of a shadow image varies with gate starting depths. The angular distribution of multiply scattered photons is obtained via semi-analytical models (Shengfu Li et al., Opt.Commun. 381, 2016, pp. 43–47). The simulated results show that increasing the gate starting depth can reduce the highly backscattered photons, thus can improve the image contrast.
Źródło:
Optica Applicata; 2018, 48, 2; 237-247
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of Particle Transport with External Driving Force and Entropy Barrier
Autorzy:
Li, S.
Zhang, Z.
Chen, D.
Powiązania:
https://bibliotekanauki.pl/articles/1398914.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.40.Jc
05.40.-a
05.10.Gg
05.60.Cd
Opis:
Transport of Brownian particle moving along a three-dimensional throat-like channel is investigated in the presence of an external constant force. The solution of the Fick-Jacobs equation in the situation is solved, and the probability current density and particle current describing the motion of particle are obtained. It is found that entropy barrier and external force can reverse the direction of particle current. The motion of Brownian particle can be tuned by the entropy barrier and the external force.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1105-1108
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on a quasi-zero-stiffness vibration isolator under random excitation
Autorzy:
Wang, Y.
Li, S.
Cheng, C.
Powiązania:
https://bibliotekanauki.pl/articles/281608.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
vibration isolator
quasi-zero-stiffness
random excitation
dynamic analysis
performance analysis
Opis:
The dynamic response and isolation performance of a Quasi-Zero-Stiffness (QZS) vibration isolator using inclined springs as negative stiffness correctors under random excitation are presented in this paper. The probabilistic linearization method is employed to determine the dynamic response of the QZS vibration isolator and compared with the exact solution based on the Fokker-Planck-Kolmogorov (FPK) equation and the equivalent linearization method. Two performance indexes (Mean Square Relative Displacement (MSRD) and Mean Square Acceleration (MSA)) are considered to evaluate the isolation performance of the QZS vibration isolator under random excitation and compared with the equivalent linear vibration isolator. The results show that the MSRD of the QZS vibration isolator is always lower than the equivalent linear vibration isolator, while the MSA of the QZS vibration isolator can be larger or lower than the equivalent linear vibration isolator based on the values of damping ratio and spectral density of the random excitation
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 621-632
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The interval Shapley value of an M/M/1 service system
Autorzy:
E, C. G.
Li, Q. L.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/330815.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
M/M/1 service system
cooperative interval game
cost allocation
Shapley value
gra przedziałowa kooperatywna
alokacja kosztów
wartość Shapley'a
Opis:
Service systems and their cooperation are one of the most important and hot topics in management and information sciences. To design a reasonable allocation mechanism of service systems is the key issue in the cooperation of service systems. In this paper, we systematically introduce the interval Shapley value as cost allocation of cooperative interval games ,[...] arising from cooperation in a multi-server service system, and provide an explicit expression for the interval Shapley value of cooperative interval games [...]. We construct an interval game [...] of a service system which shares the same value for the grand coalition with the original interval game, by using the characteristic function which is dominated by the function of the original interval game. Finally, we prove that the interval game [...] is concave, which means that the interval Shapley value of the interval game [...] is in the interval core of this interval game, and illustrate this conclusion by using numerical examples.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 3; 549-562
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nano-sized micelles formed by self-assembling of polylactide(ethylene glycol) block copolymers in aqueous solutions
Autorzy:
Yang, L.
Zhao, Z.
Wei, J.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/284952.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
kopolimery
copolymers
Źródło:
Engineering of Biomaterials; 2007, 10, no. 63-64; 16-18
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of root system architecture affected by swarming behavior
Autorzy:
Li, S.
Yu, W.
Liu, X.
Wang, M.
Powiązania:
https://bibliotekanauki.pl/articles/1078927.pdf
Data publikacji:
2020
Wydawca:
Instytut Ogrodnictwa
Tematy:
root system architecture
soil nutrient
interaction
root system
root growth
dynamic growth
swarming
behaviour
Opis:
The root system architecture (RSA) displays complex morphological characteristics because of diverse root growth behaviors. Recent studies have revealed that swarming behavior among roots is particularly important for RSA to adapt to environmental stimuli. However, few models are proposed to simulate RSA based on swarming behavior of roots. To analyze plasticity of RSA affected by swarming behavior, we propose viewing it as a swarm of single roots. A swarming behavior model is proposed by considering repulsion, alignment, and preference of individual single roots. Then, the swarming behavior model is integrated into a simple and generic RSA model (called ArchiSimple). Lastly, characteristics of RSA affected by swarming behavior model and non-swarming behavior model are compared and analyzed under three different virtual soil sets. The characteristics of RSA (such as primary root length, lateral root length, lateral roots, and resource uptake) are significantly promoted by swarming behavior. Root system distributions can also be greatly affected by swarming behavior. These results show that root foraging and exploration in soil can be regarded as collective behavior of individual single root.
Źródło:
Journal of Horticultural Research; 2020, 28, 1; 1-12
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on distribution of CO and concentration prediction in blind gallery after blasting operation
Badanie i prognozowanie rozkładu stężenia CO w ślepym wyrobisku po zakończeniu prac strzałowych
Autorzy:
Cao, Y.
Ji, H.
Zhang, Y.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/219231.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rozkład stężenia CO
zależność stężenia od czasu
współczynnik określający równomierność stężenia
współczynnik dyspersji
współczynnik wyrażający spadek stężenia
czas usuwania szkodliwych gazów po zakończeniu prac strzałowych
time-concentration curve
CO concentration distribution
uniformity coefficient
dispersion coefficient
attenuation index
fume-drainage time
Opis:
It is meaningful to study the issues of CO migration and its concentration distribution in a blind gallery to provide a basis for CO monitoring and calculation of fume-drainage time, which is of a great significance to prevent fume-poisoning accidents and improve efficiency of an excavation cycle. Based on a theoretical analysis of a differential change of CO mass concentration and the CO dispersion model in a fixed site, this paper presents several blasting fume monitoring test experiments, carried out with the test location to the head LP in arrange of 40-140 m. Studies have been done by arranging multiple sensors in the arch cross-section of the blind gallery, located at the Guilaizhuang Gold Mine, Shandong Province, China. The findings indicate that CO concentrations in the axial directions are quadratic functions with the Y and Z coordinate values of the cross-section of the blind gallery in an ascending stage of CO time-concentration curve, with the maximum CO concentrations in Y = 150 cm and Z = 150 cm. Also, the gradients of CO concentration in the gallery are symmetrical with the Y = 150 cm and Z = 150 cm. In the descending stage of CO time-concentration curve, gradients of CO concentration decrease in lateral sides and increase in the middle, then gradually decrease at last. The rules of CO concentration distribution in the cross-section are that airflow triggers the turbulent change of the CO distribution volume concentration and make the CO volume concentration even gradually in the fixed position of the gallery. Moreover, the CO volume concentrations decrease gradually, as well as volume concentration gradients in the cross-section. The uniformity coefficients of CO concentration with duct airflow velocities of 12.5 m/s, 17.7 m/s and 23.2 m/s reach near 0.9 at 100-140 m from the heading to the monitoring spot. The theoretical model of a one-dimensional migration law of CO basically coincides with the negative exponential decay, which is verified via fitting. The average effective turbulent diffusion coefficient of CO in the blind gallery is approximate to 0.108 m2/s. There are strong linear relationships between CO initial concentration, CO peak concentrations and mass of explosive agent, which indicates that the CO initial concentration and the CO peak concentration can be predicted, based on the given range of the charging mass. The above findings can provide reliable references to the selection, installation of CO sensors and prediction of the fume-drainage time after blasting.
Badania migracji, rozpływu i rozkładu stężenia CO w ślepym wyrobisku są niezbędne, stanowią one bowiem podstawę do skutecznego monitorowania poziomu CO i obliczania czasu niezbędnego na usunięcie z wyrobiska szkodliwych gazów – jest to kwestia kluczowa dla zapobiegania wypadkom związanych z zatruciem spalinami oraz dla planowania przebiegu prac wydobywczych. W oparciu o teoretyczną analizę zmian stężenia masowego CO i wykorzystując model dyspersji gazu w stałym punkcie, w pracy przedstawiono wyniki eksperymentów przeprowadzonych w ramach monitorowania stężeń gazów powybuchowych w wyrobisku LP na odległości 40-140 m od czoła wyrobiska. Badania prowadzono przy wykorzystaniu zestawu czujników rozmieszczonych w wybranych punktach ślepego wyrobiska w kopalni złota Guilaizhuang, w prowincji Shandong, Chiny. Wyniki badań wskazują, że stężenia CO w kierunkach poosiowych są funkcjami kwadratowymi wartości współrzędnych Y i Z przekroju przekroju ślepego wyrobiska w zakresie krzywej opadającej na wykresie opisującym zależność stężenia CO od czasu, przy czym maksymalne stężenia CO stwierdzono dla Y =150 cm i Z = 150 cm. Ponadto, wykazano że gradienty stężenia CO w wyrobisku są symetryczne dla Y =150 cm i Z =150 cm. W zakresie krzywej rosnącej na wykresie zależności stężenia CO od czasu gradienty stężenia CO wykazują spadek w końcowych regionach wykresu, w środkowej części wykresu notuje się jego wzrost, po czym znów następuje spadek. Na rozkład stężenia CO w tym przekroju wpływ ma fakt że przepływ powietrza wywołuje turbulentne zmiany stężenia objętościowego CO, następnie stężenie objętościowe maleje systematycznie w dalszych częściach wyrobiska. Ponadto, stwierdzono że stężenie CO a także gradienty stężenia objętościowego w przekroju maleją stopniowo. Współczynniki wyrażające równomierność stężenia CO przy przepływach powietrza z prędkością 12.5 m/s 17.7 m/s i 23.2 m/s osiągają wartość 0.9 w punkcie kontrolnym odległym od wyrobiska o 100-140 m. Teoretyczny model jednowymiarowego rozpływu CO zasadniczo pokrywa się z wzorem zależności wykładniczej z wykładnikiem ujemnym, co zostało potwierdzone w procedurze pasowania. Średnia wartość współczynnika dyfuzji CO dla przepływu turbulentnego w ślepym wyrobisku wyniosła 0.108 m2/s. Stwierdzono istnienie silnej zależności liniowej pomiędzy początkowym stężeniem CO, szczytową wielkością stężenia oraz masą użytego materiału wybuchowego, która wskazuje na możliwość prognozowania początkowego i szczytowego stężenia CO w oparciu o zakres wielkości użytego ładunku wybuchowego. Przedstawione wyniki badań stanowić mogą wiarygodną podstawę dla wyboru rodzaju i miejsca zainstalowania czujników CO oraz do prognozowania czasu wymaganego na usuniecie szkodliwych gazów po zakończeniu prac strzałowych.
Źródło:
Archives of Mining Sciences; 2018, 63, 2; 283-300
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plantar pressure analysis of above-knee amputee with a developed microprocessor-controlled prosthetic knee
Autorzy:
Cao, W.
Yu, H.
Meng, Q.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/306983.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ciśnienie podeszwowe
proteza stawu kolanowego
analiza chodu
plantar pressure
above-knee amputee
microprocessor-controlled
prosthetic knee
gait analysis
Opis:
Human gait motion analysis was one useful method for lower limb prosthesis study. The most often measured parameters were plantar pressure, kinetic and kinematic parameters. It was indispensable for prosthetic knee design and performance assessment. The aim of this study was to analysis the plantar pressure in traumatic above-knee amputee equipped with a developed microprocessor-controlled prosthetic knee. Methods: The maximum force of forefoot and rearfoot, the average vertical reaction force and pressure and the centre of pressure (COP) offset trajectories of ten above-knee amputees under different walking speeds were obtained. Results: Both forefoot and rearfoot force were bigger in intact leg than prosthetic leg. As the speed increased, the pressure increased in both sides. Forefoot bore more pressure than rearfoot in both legs. The average vertical pressure and force both increased along with the increase of speed. The force and pressure of intact side were always bigger than the prosthetic side. The trend of COP and gait line of the prosthetic and intact side had no significant difference. The length of the gait line of prosthetic side was greater than the intact side. Conclusions: The results of this study exhibited reduced plantar pressure in the prosthetic side. The typical butterfly diagrams were produced during different walking speeds. It indicated that the stability of the microprocessor-controlled prosthetic knee could be guaranteed.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 4; 33-40
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of two-stage stirred pulp-mixing on coal flotation
Autorzy:
Gui, X.
Wang, Y.
Zhang, H.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/110764.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mixing
stirred
two stage
fine coal
flotation
Opis:
Stirred pulp-mixing is performed before coal flotation. In this study, a two-stage stirred pulpmixing tank was designed based on the single-stirred process to intensify the mixing effect of pulp and flotation reagents. A tank has a pitched-impeller opening-type turbine. Stirred pulp-mixing and flotation experiments were conducted on a sample of anthracite fine coal (-0.5mm) from the Xuehu Coal Preparation Plant in Henan Province, China. The results of the two-stage stirred pulp-mixing were compared with those of a single-stage stirred pulp-mixing in terms of flotation performance. Compared with the single-stage stirred pulp-mixing, two mixing areas and double-layer impeller were able to strengthen the energy input to the stirred system, thereby improving the mixing efficiency of flotation reagents and coal particles in the pulp. The two-stage stirred pulp-mixing significantly increased the flotation feed rate of the cyclone-static micro-bubble flotation column and concentrate yield, enhanced the combustible matter recovery effect of coarse particles at a suitable flotation feed rate, and ensured the recovery effect of fine particles at high flotation feed rate.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 299-310
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of the empirical seismic vulnerability of typical structures in multiple intensity zones
Autorzy:
Li, S. Q.
Yu, T. L.
Chen, Y. S.
Powiązania:
https://bibliotekanauki.pl/articles/230122.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sejsmiczność
porównanie podatności
analiza podatności
dane empiryczne
baza danych sejsmicznych
MDI
struktura typowa
seismicity
vulnerability comparison
vulnerability analysis
empirical data
seismic database
typical structure
Opis:
To study the difference in seismic vulnerability of multiple typical structures in multiple intensity zones, the seismic damage of 7099 buildings of Dujiangyan masonry structure (MS), reinforced concrete structure (RC) and bottom frame seismic wall masonry (BFM) in the 2008 Wenchuan earthquake in China is summarized and analysed. First, a statistical analysis of the data is carried out, the empirical seismic vulnerability matrix and model curves are established by considering the number of storeys, the age and the fortification factors.The vulnerability curves of the cumulative exceeding probability of the empirical seismic damage and the grade of the seismic damage in multiple intensity zones are shown. The mean damage index vulnerability matrix model is proposed and verified using the empirical seismic damage matrix of typical structures.
Źródło:
Archives of Civil Engineering; 2019, 65, 3; 167-183
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ metody suszenia i temperatury procesu na właściwości higroskopijne suszu jabłkowego
Influence of the method of drying and process temperature on hygroscopic properties of dried apples
Autorzy:
Witrowa-Rajchert, D.
Fabisiak, A.
Stawczyk, J.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/287906.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
suszenie konwekcyjne
suszenie sublimacyjne
suszenie niskotemperaturowe
właściwości sorpcyjne
susz jabłkowy
convection drying
sublimation drying
low-temperature drying
sorptive properties
Opis:
Celem badań była analiza właściwości sorpcyjnych jabłek suszonych sublimacyjnie, konwekcyjnie i niskotemperaturowo pod ciśnieniem atmosferycznym. Na właściwości sorpcyjne suszu jabłkowego miała wpływ metoda suszenia. Wyższa temperatura płyty grzejnej w czasie suszenia sublimacyjnego spowodowała wzrost ilości wchłanianej przez materiał pary wodnej. Dla suszu konwekcyjnego nie stwierdzono istotnego wpływu temperatury powietrza na kinetykę adsorpcji pary wodnej. Przebieg kinetyk adsorpcji pary wodnej dla suszy niskotemperaturowych wykazał, że prowadzenie całego procesu w temperaturach ujemnych wpływa na mniejszą zdolność adsorpcji. Zwiększenie temperatury powietrza w drugiej części procesu powodowało znaczne zwiększenie ilości wchłanianej przez susz pary wodnej.
The aim of the study is an analysis of sorptive properties of apples dried by sublimation, convection and in low temperature under atmospheric pressure. The drying method influences sorptive properties of dried apples. Higher temperature of the heating plate during sublimation drying caused an increased of vapour absorbed by material. Air temperature did not have an important influence on kinetics of vapour absorption for convection dried apples. The kinetics of vapour absorption for low-temperature dried apples proved that when the process takes place in negative temperatures the ability to absorb is lower. An increase of air temperature in the second part of the process caused a considerable increase of the amount of vapour absorbed by dried apples.
Źródło:
Inżynieria Rolnicza; 2006, R. 10, nr 7(82), 7(82); 457-463
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A generalized varying-domain optimization method for fuzzy goal programming with priorities based on a genetic algorithm
Autorzy:
Li, S. Y.
Hu, C. F.
Teng, C. J.
Powiązania:
https://bibliotekanauki.pl/articles/970454.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
rozmyte programowanie celowe
priorytet
algorytm genetyczny
fuzzy goal programming
priorities
SQP
genetic algorithm
GENOCOP III
Opis:
This paper proposes a generalized domain optimization method for fuzzy goal programming with different priorities. According to the three possible styles of the objective function, the domain optimization method and its generalization are correspondingly proposed. This method can generate the results consistent with the decision-maker's priority expectations, according to which the goal with higher priority may have higher level of satisfaction. However, the reformulated optimization problem may be nonconvex for the reason of the nature of the original problem and the introduction of the varying-domain optimization method. It is possible to obtain a local optimal solution for nonconvex programming by the SQP algorithm. In order to get the global solution of the new programming problem, the co-evolutionary genetic algorithm, called GENOCOP III, is used instead of the SQP method. In this way the decision-maker can get. the optimum of the optimization problem. We demonstrate the power of this proposed method based on genetic algorithm by illustrative examples.
Źródło:
Control and Cybernetics; 2004, 33, 4; 633-652
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A scheme of resource allocation and stability for peer-to-peer file-sharing networks
Autorzy:
Li, S.
Sun, W.
E, C. G.
Shi, L.
Powiązania:
https://bibliotekanauki.pl/articles/331243.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
peer-to-peer networks
fairness
pricing
stability
utility maximization
sieć peer-to-peer
wycena
maksymalizacja użyteczności
Opis:
Peer-to-peer (P2P) networks offer a cost-effective and easily deployable framework for sharing content. However, P2P file-sharing applications face a fundamental problem of unfairness. Pricing is regarded as an effective way to provide incentives to peers to cooperate. In this paper we propose a pricing scheme to achieve reasonable resource allocation in P2P file-sharing networks, and give an interpretation for the utility maximization problem and its sub-problems from an economic point of view. We also deduce the exact expression of optimal resource allocation for each peer, and confirm it with both simulation and optimization software. In order to realize the optimum in a decentralized architecture, we present a novel price-based algorithm and discuss its stability based on Lyapunov stability theory. Simulation results confirm that the proposed algorithm can attain an optimum within reasonable convergence times.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 3; 707-719
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design, preparation and properties of novel flame retardant thermosetting vinyl ester copolymers based on castor oil and industrial dipentene
Autorzy:
Mao, W.
Li, S.
Li, M.
Huang, K.
Xia, J.
Powiązania:
https://bibliotekanauki.pl/articles/777956.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
castor oil
vinyl ester resin
copolymers
flammability
thermal properties
Opis:
A novel bio-based flame-retardant thermosetting vinyl ester resin monomer was synthesized from castor oil. The chemical structures of the monomer was characterized by FTIR and 1H-NMR. In order to improve its rigidity and expand its application in the field of bio-based materials, it was mixed with certain proportions of another reactive bio-based VER monomer, which had rigid and strong polar groups, and then a series of copolymers were prepared with thermal curing method. Then their tensile property, hardness, morphology of fractured surface, flame retardant property, DMA and thermostability were all investigated. The results indicated that the copolymers had relatively high tensile strength of 11.2 MPa, and the limiting oxygen index is above 23% in all prepared copolymers. DMA demonstrates that the glass transition temperature of the cured resins is up to 56.1°C. Thermogravimetric analysis shows that the copolymers have excellent thermal stability.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 3; 1-8
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multifunctional interphases for polymeric engineering products and smart devices
Wielofunkcyjne warstwy dla polimerowych wyrobów i urządzeń inteligentnych
Autorzy:
Gutowski, V. S.
Toikka, G.
Liu, M. S.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/176055.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polymers
polyethyleneimines
aminosilanes
protonation
surface conductivity
electrostatic deposition
adhesion
coating
polimery
polietylenoiminy
aminosilany
protonowanie
przewodnictwo powierzchniowe
osadzanie elektrostatyczne
adhezja
powłoka
Opis:
The ability to control interactions between polymeric substrate and single molecules including successful placement of molecules in desired location at technologically useful conformation and spatial architecture provides a platform for designing functional surfaces for high-tech engineered products and smart devices. Subsequent ability to control interactions between arrays of immobilized molecules in the form of molecular brushes and interacting materials such as fluids, solids or bioactive materials such as cells and tissues facilitates the control of adhesion and fracture properties of interfaces for structurally bonded or coated materials or enables control of other properties such as surface conductivity of flexible films, fibres and fabrics for electronic or energy harvesting applications, live cells propagation in biomedical sensors or devices and for restorative medicine applications. This paper discusses theoretical and practical aspects of surface grafted molecular brushes at controlled surface density, spatial geometry and chemical functionality which facilitate more than 1000-fold strength increase of bonded assemblies in comparison with unmodified substrates to the point of achieving 100% cohesive fracture of substrates or adhesives, as detailed in our earlier publications. The same molecules exhibiting an in-built electron conductivity facilitate achieving a 108-fold increase in polymer surface conductivity.
Analiza oddziaływania podłoża polimerowego i pojedynczych cząsteczek dotyczy ich rozmieszczenia dla ustalonego położenia w celu uzyskania korzystnej technologicznie konfiguracji. Stanowi ona podstawę do projektowania struktury geometrycznej powierzchni zaawansowanych technologicznie wyrobów i urządzeń inteligentnych. Określenie stopnia wzajemnego oddziaływania pomiędzy układami cząsteczek w postaci „szczotek molekularnych” – substancjami w stanie ciekłym i stałym lub materiałami bioaktywnymi, m.in. komórkami i tkankami, umożliwia kontrolę przylegania i pękania materiałów połączonych. Także kontrolę innych właściwości m.in. przewodnictwa powierzchniowego wytworzonych warstw lub włókien oraz rozprzestrzeniania się komórek w czujnikach i urządzeniach biomedycznych. W pracy przedstawiono teoretyczne i praktyczne zagadnienia z obszaru „szczotek molekularnych”. Uwzględniono kontrolę ich gęstości powierzchniowej, geometrii i właściwości chemicznych. Umożliwi to zwiększenie wytrzymałości łącznych elementów ponad 1000-krotnie w porównaniu z podłożem niemodyfikowanym. Zapewni także pękanie kohezyjne podłoża lub warstwy klejów.
Źródło:
Advances in Manufacturing Science and Technology; 2015, 39, 1; 5-15
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active fault tolerance control of a wind turbine system using an unknown input observer with an actuator fault
Autorzy:
Li, S.
Wang, H.
Aitouche, A.
Tian, Y.
Christov, N.
Powiązania:
https://bibliotekanauki.pl/articles/329822.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wind turbine system
linear parameter varying system
fault tolerant control
unknown input observer
elektrownia wiatrowa
sterowanie tolerujące uszkodzenia
obserwator wejściowy
Opis:
This paper proposes a fault tolerant control scheme based on an unknown input observer for a wind turbine system subject to an actuator fault and disturbance. Firstly, an unknown input observer for state estimation and fault detection using a linear parameter varying model is developed. By solving linear matrix inequalities (LMIs) and linear matrix equalities (LMEs), the gains of the unknown input observer are obtained. The convergence of the unknown input observer is also analysed with Lyapunov theory. Secondly, using fault estimation, an active fault tolerant controller is applied to a wind turbine system. Finally, a simulation of a wind turbine benchmark with an actuator fault is tested for the proposed method. The simulation results indicate that the proposed FTC scheme is efficient.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 69-81
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pretreatment of coking wastewater by an adsorption process using fine coking coal
Autorzy:
Gao, L.
Li, S.
Wang, Y.
Gui, X.
Xu, H.
Powiązania:
https://bibliotekanauki.pl/articles/110417.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coking coal
coking wastewater
adsorption
COD
phenol
Opis:
A new technique for pretreatment of coking wastewater is introduced based on the concept of circular economy. Coal is fed into a coking system after adsorption. This study validates the feasibility of using coking coal to adsorb organic pollutants in coking wastewater. The sorption kinetics and equilibrium sorption isotherms of coking coal for removal of chemical oxygen demand (COD) and phenol from coking wastewater was also discussed in this paper. Gas chromatograph/mass spectroscopy (GC/MS) was used to detect changes in the quality of coking wastewater. The results showed that when coking coal dosage was 120 g/dm3, 65% of COD and 34% of phenol in waste water can be removed after 40 min of agitation. The surface functional groups of coking coal before and after adsorption were observed with a Fourier transform infrared spectrometer. The kinetics of COD and phenol adsorption from coking wastewater by coking coal fitted the pseudo second-order model. The adsorption process of coking coal can be classified into two categories, namely, rapid and slow. The Freundlich isotherm provided a better fit with all adsorption isotherms than the Langmuir isotherm. Coking coal could be a suitable low-cost adsorbent for recalcitrant organic pollutants.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 422-436
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic-accumulative operation policy of continuous distillation for the purification of anisole
Autorzy:
Wang, Z.
Li, S.
Wang, C.
Guo, X.
Bai, P.
Powiązania:
https://bibliotekanauki.pl/articles/779622.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
anisole recycling
dynamic-accumulative operation policy
continuous distillation
simulation
Opis:
In the B10 isotope enrichment industry, the purification of anisole mixture makes great sense. A dynamic-accumulative operation policy of continuous distillation (DACD) with repeated filling and dumping of the still is proposed for the separation of trace heavy impurities in the recycled anisole. To simulate and optimize the purification process of anisole, a mathematical model of DACD is derived, and the computer codes are developed in the MATLAB environment. Moreover, the experiment is performed in a pilot-scale distillation column. The results show that the experimental date agrees well with simulation results. DACD could solve the difficulty of flow rate control when the bottom flow rate is very small in continuous distillation. The size of the still in this operation mode is also smaller than that in batch distillation. And the yield of anisole is raised to 99.91%. In a word, DACD is especially suitable for separating trace heavy impurities from the recycled anisole.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 1; 33-39
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The characteristics of radon and thoron concentration from soil gas in Shenzhen City of Southern China
Autorzy:
Wang, N.
Zheng, L.
Chu, X.
Li, S.
Yan, S.
Powiązania:
https://bibliotekanauki.pl/articles/148789.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
222Rn/220Rn
soil gas
radon mapping
China
Opis:
Radon (222Rn) and thoron (220Rn) from soil gas are very significant factors that can affect the indoor radon level in the first floor or in the basement. China is one of the countries with the highest thorium content in the world. Therefore, it is very significant to study 222Rn/220Rn concentration in the soil in Shenzhen City (SC). A 222Rn/220Rn survey was performed using a portable radon monitor (model RAD7) at 69 sites, covered a total area of 1800 km2 in 2013 to get the original data for radon risk estimation in SC. The average values of 222Rn and 220Rn concentration of soil gas of the total 69 locations are 86 ± 72 kBq•m–3 and 118 ± 85 kBq•m–3, respectively. 222Rn/220Rn concentrations are related to geological lithology. 222Rn concentrations vary from 40 to 370 kBq•m–3 and from 15 to 118 kBq•m–3 in weathered granite products and sediments, respectively, while 220Rn concentrations are from 103 to 435 kBq•m–3 and 2.2 to 96 kBq•m–3. The higher 220Rn values were mainly observed at the sites covered by the weathered granite products. Comparing with the areas of high 222Rn concentration, the areas of high 220Rn values are larger. The distribution of 222Rn concentration in the vertical direction displays an exponential distribution mode, but there is no rule of 220Rn concentration. The investigation suggests that people should pay attention to 220Rn contribution in the radon mapping of SC, as well as in the indoor radon survey.
Źródło:
Nukleonika; 2016, 61, 3; 315-319
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fully-phase optical image encryption in diffractive-imaging scheme with QR-code-based random illumination
Autorzy:
Wang, Z.
Zhang, Y.
Gong, Q.
Li, S.
Qin, Y.
Powiązania:
https://bibliotekanauki.pl/articles/174126.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical encryption
diffractive imaging
fully phase
phase retrieval algorithm
Opis:
Based on a fully phase encoding and phase retrieval algorithm, a diffractive-imaging-based optical encryption scheme with random illumination is proposed. In the encryption process, a QR code image is placed in the optic path to modulate the incident light and thus generate a random illumination, which has been demonstrated to enable the proposed scheme to resist the multi-slice ptychographic phase retrieval algorithm attack. The plaintext is phase-encoded, and then encrypted by two random phase masks. The diffraction pattern in the output plane is recorded as ciphertext by a CCD camera. For decryption, an iterative phase retrieval algorithm with median filtering operation is implemented. Simulation results demonstrate the effectiveness, security, and robustness of the proposal.
Źródło:
Optica Applicata; 2017, 47, 2; 233-243
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation, characterization and coagulation behaviour of a novel inorganic coagulant - polyferric(III)-magnesium(II) sulfate
Autorzy:
Liu, Z.
Li, S.
Zhang, H.
Nie, F.
Wang, Q.
Powiązania:
https://bibliotekanauki.pl/articles/207302.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coagulation
infrared spectroscopy
magnesium
wastewater treatment
textile wastewater
coagulant
koagulacja
spektroskopia w podczerwieni
magnez
oczyszczanie ścieków
ścieki włókiennicze
koagulant
Opis:
A novel coagulant, polyferric(III)-magnesium(II) sulfate (PFMS), was prepared. The preparation technology was optimized and the optimized PFMS product was used to treat actual textile wastewater. The performance of PFMS was evaluated and compared with those of conventional coagulants. X-ray diffraction and infrared spectrometry show that PFMS is a macromolecular composite polymer of ferric and magnesium based on -OH bonds. The coagulation performance of PFMS is better than those of PFS, PAC, and PFC. The coagulation mechanism of PFMS in treating actual textile wastewater is primarily driven by charge neutralization at low dosages and co-precipitation netting at high dosages.
Źródło:
Environment Protection Engineering; 2013, 39, 3; 57-71
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modular design and assembly of automotive and architectural structures - product integration through adhesive bonding
Projektowanie i montaż systemów modułowych w przemyśle samochodowym i budownictwie - połączenie elementów wyrobów metodą klejenia
Autorzy:
Kuys, B.
Gutowski, M.
Li, S.
Gutowski, V. S.
Cerra, A.
Powiązania:
https://bibliotekanauki.pl/articles/175851.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modularisation systems
automotive
building industry
adhesive bonding
systemy modułowe
motoryzacja
budownictwo
połączenia klejone
Opis:
This paper analyses advances in design and manufacturing methodology based on system modularisation in the automotive and building & construction industries and offers novel, fully validated technology for modules assembly by adhesive bonding. It is shown, how application of appropriate modularisation methodology through sub-division of the entire system into principal system platform and independent functional or stylistic modules enables identification of components common to an entire family of product, and those which facilitate product re-configuration and stylings. The latter category of subcomponents are easily integrated into the final structure by mounting onto the principal system platform through interfaces facilitating rapid assembly and/or disassembly of the product. Through adoption of modularisation, the pivotal structure elements such as automotive framing systems or high-rise building’s curtain wall framing and cladding can be quickly and cost effectively designed, re-designed when needed (for instance for re-styling or refurbishing) and cost-effectively reconfigured through assembly of a variety of designated sub-systems onto the principal system platform. Another aspect of this paper discusses and validates a feasible technology facilitating for surface modification of typical engineering substrate materials (plastics, composites, metals and ceramics) for rapid assembly of structures through adhesive bonding of decorative and/or functional cladding and vision panels to curtain wall structures of high-rise commercial or residential buildings. An identical approach to applications in rapid assembly of automotive modular systems will be presented in the forthcoming paper.
W pracy zawarto analizę postępu w metodach projektowania i produkcji opartych na zasadzie systemów modułowych w motoryzacji oraz budownictwie, również technologię montażu za pomocą połączeń klejonych. Przedstawiono, w jaki sposób przyjęcie odpowiednich modułów poprzez podział całego systemu wpływa na podstawową platformę montażową oraz autonomiczne moduły funkcjonalne i stylistyczne. Umożliwiona jest wówczas identyfikacja elementów wspólnych dla całej rodziny produktów, także pozwalających na przekształcenie lub stylizację wyrobu. Moduły autonomiczne są łatwo integrowalne w produkty finalne poprzez montaż na podstawowej platformie montażowej przez zastosowanie połączeń standardowych – umożliwiają szybki montaż i/lub demontaż. Wykorzystanie modułowych, kluczowych elementów konstrukcji, jak rama zawieszenia samochodu lub ściana osłonowa wysokościowca i płyty ościenne pozwala na przekształcanie, szybkie i tanie projektowanie, również przeprojektowywanie (np. dla nowej stylizacji lub odnowienia budynku), oraz przekształcanie poprzez montaż różnych nowo projektowanych podsystemów na głównej platformie montażowej systemu. Odrębny fragment pracy omawia łatwą do wprowadzenia technologię modyfikacji powierzchni typowych materiałów inżynierskich (polimery, kompozyty, metale i ceramika) dla szybkiego montażu konstrukcji poprzez klejenie ozdobnych lub funkcjonalnych paneli ościennych lub szkła do ram ścian osłonowych wysokich budynków mieszkalnych i komercyjnych. Identyczne podejście w zastosowaniu do szybkiego montażu samochodowych systemów modułowych będzie przedstawione w kolejnym artykule.
Źródło:
Advances in Manufacturing Science and Technology; 2016, 40, 3; 5-28
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-dimensional simulation of the fracture system distribution in formation rock based on fractal method
Trójwymiarowe symulacje rozkładu spękań w skałach z wykorzystaniem metody fraktali
Autorzy:
Li, W.
Zhao, H.
Liu, M.
Li, S.
Sun, W.
Wang, L.
Powiązania:
https://bibliotekanauki.pl/articles/219509.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
szczelinowanie hydrauliczne
wymiary fraktali
naturalne spękania
spękania powstałe wskutek szczelinowania
symulacje numeryczne
hydraulic fracturing
fractal dimension
natural fracture
fracturing fracture
numerical simulation
Opis:
During exploitation process of fractured reservoir, the complex distribution of natural fracture system may lead to a series of accidents, such as sand plug and multi fracture extension in hydraulic fracturing operation. Considering the difficulties of numerical analysis on formation rock mass fracture system distribution, three-dimensional geometry model of a single fracture formation is proposed in this paper, and fractal geometry method is introduced to build the three-dimensional fractal description model of formation fracture system distribution. On this basis, the effects of fractal parameters on natural fracture porosity, permeability and other properties are analyzed. The results show that: First, the number and propagation of natural fracture are controlled by the fractal dimension, the number of groups and the initial quantity. Second, the fractal dimension of natural fracture distribution has an obvious effect on natural fracture porosity and permeability. Third, porosity and permeability of natural fracture distribution both experience exponential growth as fractal dimension increases. Fourth, when the fractal dimension remains constant, the porosity and permeability of natural fractures both increase with the fracture scale.
W trakcie eksploatacji złoża zalęgającego w spękanych warstwach i pokładach złożony system naturalnych spękań prowadzić może do licznych incydentów, np. powstawania zatorów piaskowych lub nadmiernego rozszerzenia spękań w trakcie szczelinowania hydraulicznego. Z uwagi na trudności związane z analizą numeryczną rozkładu spękań skał macierzystych, w pracy zaproponowano trójwymiarowy model geometryczny pojedynczego pęknięcia z wykorzystaniem metod geometrii fraktalnej do opracowania trójwymiarowego modelu opisującego powstawanie układu spękań i ich rozkład. Na tej podstawie przeanalizowano wpływ parametrów fraktalnych na naturalną porowatość pękniętych skał, ich przepuszczalność oraz pozostałe właściwości. Wyniki badań wskazują że, po pierwsze, liczba i tempo propagacji naturalnych spękań uzależnione są od wymiarów fraktalnych, liczby grup i wielkości początkowej. Po drugie, wymiary fraktalne naturalnego systemu spękań skał mają zdecydowany wpływ na porowatość i przepuszczalność. Po trzecie, porowatość i przepuszczalność naturalnych systemów pęknięć wykazują wzrost w miarę wzrastania wymiarów fraktalnych. Po czwarte, gdy wymiary fraktalne pozostają niezmienne, zarówno porowatość i przepuszczalność naturalnych spękań rosną wraz ze skalą fraktali.
Źródło:
Archives of Mining Sciences; 2018, 63, 2; 425-436
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flotation behavior of hard-to-separate and high-ash fine coal
Autorzy:
Xing, Y.
Gui, X.
Liu, J.
Cao, Y.
Zhang, Y.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/110585.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation behavior
fine coal
Fuerstenau upgrading curve
energy input
selectivity
Opis:
The flotation behavior of hard-to-separate and high-ash fine coal was investigated using conventional flotation with constant power input. A new flotation process, based on energy input and distribution, was designed to lower the ash content of concentrate. The results obtained using Fourier transform infrared (FTIR) analysis show that the coal samples have good floatability because of many hydrophobic and few hydrophilic functional groups. Under a constant power input, a large number of ash-forming materials floated into a froth product at the start of flotation. Based on the Fuerstenau upgrading curves, it was determined that the 0.25-0.074 mm size fraction range showed the worst selectivity when compared with 0.50-0.25 mm and -0.074 mm size fractions. The desired concentrate with an ash content of 13.98%, 27.59% of ash recovery, and 80.01% combustible matter recovery could be obtained by transferring the excess energy of the flotation-conditioning stage to the pre-conditioning stage and increasing the power input step-by-step in the flotation-conditioning stage at equal total energy consumption.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 703-717
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of the Heat of Reaction of Polytetrafluoroethylene/Aluminum Composites Based on Laser Initiation
Autorzy:
Li, S.
Wu, Y.
Lin, Q.
Huang, C.
Yang, S.
Li, J.
Powiązania:
https://bibliotekanauki.pl/articles/358195.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
reactive materials
PTFE/Al composites
heat of reaction
laser initiation
Opis:
Polytetrafluoroethylene/aluminum (PTFE/Al) composites are reactive materials which can release energy due to exothermic chemical reactions initiated under shock loading conditions. In order to accurately measure the potential maximum heat of reaction of PTFE/Al composites in an inert atmosphere, we propose in this paper a heat of reaction measurement system based on laser initiation. Our results show that the measurement system successfully initiates the chemical reaction between PTFE and Al in an argon atmosphere. The comparison between theoretical calculations and experimental data demonstrates that our measurement method is highly accurate and exhibits excellent consistency. Thus, the heat of reaction measurement system based on laser initiation is applicable for measuring the heat of reaction of PTFE/Al composites and also other complicated reactive materials.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 3; 534-546
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of preparation methods of mixed calcium and zinc thermal stabilizers derived from dimer fatty acid and tung-oil based C22 triacid on properties of PVC
Autorzy:
Li, M.
Wang, M.
Li, S.
Huang, K.
Mao, W.
Xia, J.
Powiązania:
https://bibliotekanauki.pl/articles/778123.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
poly(vinyl chloride)
mixed calcium and zinc thermal stabilizer
synthesis technology
thermal stabilization
Opis:
Calcium and zinc salts of dimer fatty acids (DFA-Ca and DFA-Zn) were synthesized using direct neutralization and metathesis technologies, respectively. The adduct of maleic anhydride and methyl eleostearate (MAME) was also converted to the corresponding zinc soap (C22TA-Zn) and calcium soap (C22TA-Ca) by the two different synthetic routes. Mixed Ca/Zn salts between DFA-Ca and DFA-Zn, and between C22TA-Zn and C22TA-Ca were used as thermal stabilizers for poly(vinyl chloride) (PVC). The PVC thermal stability was determined using Congo red test, discoloration test, torque rheological analysis and TGA. Dynamic mechanical properties were also tested. Results indicated that the DFA-Ca/DFA-Zn thermal stabilizer from direct neutralization technology was found to be superior to that of the metathesis product. The C22TA-Ca/C22TA-Zn thermal stabilizer from direct neutralization method had overall superior thermal stability, and displayed modulus and glass transition comparable to that of metathesis product. Direct neutralization method was more excellent and convenient than metathesis technology.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 2; 78-87
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PP2A controls methionine metabolism elicited by intracellular H2O2
Autorzy:
Trotta, A.
Li, S.
Mhamdi, A.
Ravanel, S.
Noctor, G.
Kangasjarvi, S.
Powiązania:
https://bibliotekanauki.pl/articles/80912.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
intracellular signalling
plant cell
reactive oxygen species
protein
post-translational modification
phosphorylation
methionine
hydrogen peroxide
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fiber-optic accelerometer based on a modal interferometer using a thin-core fiber
Autorzy:
Wang, X
Wu, X
Li, S
Ge, Q
He, T
Yu, B
Powiązania:
https://bibliotekanauki.pl/articles/174927.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fiber-optic accelerometer
modal interferometer
thin-core fiber
Opis:
A compact fiber-optic accelerometer based on a modal interferometer, which is fabricated by misaligned splicing of a short section of a thin-core fiber between two sections of a standard single-mode fiber, is demonstrated experimentally. A spectrum analysis method is used to detect an acceleration signal rapidly. The experimental results show that the thin-core fiber-based fiber-optic accelerometer has a minimum detectable acceleration of 3.3×10–3g (g – gravitational acceleration), and a wide frequency response range from 10 to 1200 Hz. Moreover, the proposed accelerometer exhibits the advantages of low cost, simple structure and easy fabrication.
Źródło:
Optica Applicata; 2015, 45, 3; 317-325
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modulation of virulence genes by the two-component system PhoP - PhoQ in avian pathogenic Escherichia coli
Autorzy:
Tu, J.
Huang, B.
Zhang, Y.
Xue, T.
Li, S.
Qi, K.
Powiązania:
https://bibliotekanauki.pl/articles/30418.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Avian pathogenic Escherichia coli (APEC) infections are a very important problem in the poultry industry. PhoP-PhoQ is a two-component system that regulates virulence genes in APEC. In this study, we constructed strains that lacked the PhoP or PhoQ genes to assess regulation of APEC pathogenicity by the PhoP-PhoQ two-component system. The PhoP mutant strain AE18, PhoQ mutant strain AE19, and PhoP/PhoQ mutant strain AE20 were constructed by the Red homologous recombination method. Swim plates were used to evaluate the motility of the APEC strains, viable bacteria counting was used to assess adhesion and invasion of chick embryo fibroblasts, and Real-Time PCR was used to measure mRNA expression of virulence genes. We first confirmed that AE18, AE19, and AE20 were successfully constructed from the wild-type AE17 strain. AE18, AE19, and AE20 showed significant decreases in motility of 70.97%, 83.87%, and 37.1%, respectively, in comparison with AE17. Moreover, in comparison with AE17, AE18, AE19, and AE20 showed significant decreases of 63.11%, 65.42%, and 30.26%, respectively, in CEF cell adhesion, and significant decreases of 59.83%, 57.82%, and 37.90%, respectively, in CEF cell invasion. In comparison with AE17, transcript levels of sodA, polA, and iss were significantly decreased in AE18, while transcript levels of fimC and iss were significantly decreased in AE19. Our results demonstrate that deletion of PhoP or PhoQ inhibits invasion and adhesion of APEC to CEF cells and significantly reduces APEC virulence by regulating transcription of virulence genes.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermally Induced Polymorphic Transformation of Hexanitrohexaazaisowurtzitane (HNIW) Investigated by in-situ X-ray Powder Diffraction
Autorzy:
Liu, Y.
Li, S.
Wang, Z.
Xu, J.
Sun, J.
Huang, H.
Powiązania:
https://bibliotekanauki.pl/articles/358065.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
HNIW
polymorphism
in situ X-ray diffraction
phase transition
heat stimulation
Opis:
The ε→γ phase transition of HNIW induced by heat was investigated with in situ X-ray powder diffraction (PXRD). The effects of purity, particle size, insensitive additives and the time of isothermal heat treatment on the phase transition were evaluated. It was found that the phase transition is irreversible with changes in temperature, and the two phases can coexist in a certain temperature range. Moreover, the initial phase transition temperature increases with increasing purity and decreasing particle size of HNIW, and thus with the approximate crystal density. The addition of graphite and paraffin wax to HNIW as insensitive additives leads to a decrease in the initial phase transition temperature, but the addition of TATB does not affect the initial phase transition temperature. Thus, TATB is a suitable insensitive additive. Moreover, at the critical temperature, the isothermal time determined the efficiency of the ε- to γ-phase transition. This work lays the foundations for the choice of molding technologies, performance test methods, ammunition storage options, as well as the manufacture of HNIW-based explosive formulations.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 4; 1023-1037
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of intergrown particle liberation on difficult-to-separate coking coal flotation
Autorzy:
Gui, X.
Liu, J.
Cao, Y.
Xing, Y.
Deng, Y.
Li, S.
Powiązania:
https://bibliotekanauki.pl/articles/109875.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
liberation
particle size
coking coal
hydrophobicity
Opis:
Flotation tests with intergrown particle liberation were conducted to explore a separation method of difficult-to-separate coking coal from the Tangshan Kailuan mine in China. The particle size distribution, density and coal petrography were investigated. The difficult-to-separate coking coal sample resulted in intergrown particles, such as non-liberated coal and rocks. Thus, intergrown coal particle liberation and re-separation tests were conducted. The results showed that grinding time had a great effect on the flotation performance. Grinding prompted coal to dissociate and improve the surface hydrophobic properties of minerals. However, heterogeneous fine silt covered the surface of coal particles when coal was ground too long. The inorganic mineral particles were over-ground and reduced the contact angle of coal. The results of coal rock dissociation and laboratory re-separation tests showed that clean coal combustible recovery increased through intergrown particle liberation and re-separation.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 279-294
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic analyses of cytosolic NADPH-regenerating systems reveal specific functions in oxidative stress responses
Autorzy:
Mhamdi, A.
Li, S.
Van Der Kelen, K.
Van Breusegem, F.
Noctor, G.
Powiązania:
https://bibliotekanauki.pl/articles/81109.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
genetic analysis
nicotinamide adenine dinucleotide phosphate
dehydrogenase
oxidative stress
gene expression
salicylic acid
hydrogen peroxide
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single and multidrug filomicelles as anticancer drug delivery system
Autorzy:
Jelonek, K.
Kasperczyk, J.
Li, S.
Kaczmarczyk, B.
Orchel, A.
Musiał-Kulik, M.
Powiązania:
https://bibliotekanauki.pl/articles/284619.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
drug delivery system
filomicelles
polymeric Micelles
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 53
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proteomics profiles reveal the potential roles of proteins involved in chicken macrophages stimulated by Lipopolysaccharide
Autorzy:
Li, S.
Chen, Y.
Xue, W.
Wang, Q.
Huai, Z.
An, C.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/16647586.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
chicken macrophage (HD11)
immune response
lipopolysaccharide (LPS)
proteomics
Opis:
Lipopolysaccharide (LPS), a core part of gram-negative bacteria, is crucial for inducing an inflammatory response in living things. In the current study, we used LPS from Salmonella to stimulate chicken macrophages (HD11). Proteomics was used to investigate immune-related proteins and their roles further. Proteomics investigation revealed 31 differential expression proteins (DEPs) after 4 hours of LPS infection. 24 DEPs expressions were up-regulated, while seven were down-regulated. In this investigation, ten DEPs were mainly enriched in S. aureus infection, complement, and coagulation cascades, which were all implicated in the inflammatory response and clearance of foreign pathogens. Notably, complement C3 was shown to be up-regulated in all immune-related pathways, indicating that it is a potential protein in this study. This work contributes to a better understanding and clarification of the processes of Salmonella infection in chickens. It might bring up new possibilities for treating and breeding Salmonella-infected chickens.
Źródło:
Polish Journal of Veterinary Sciences; 2023, 26, 2; 265-274
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacja MES i optymalizacja prędkości gięcia w procesie kucia ciężkich, jednolitych wałów korbowych z ciągłym przebiegiem włókien metodą N-TR
FE simulation and bending speed optimization of N-TR continuous grain flow forging process for solid heavy crankshaft
Autorzy:
Zhang, L. H.
Zhang, Z. C.
Li, S. Y.
Cui, H.
Cui, H. X.
Powiązania:
https://bibliotekanauki.pl/articles/211742.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
Tematy:
ciężkie wały korbowe
kucie z ciągłym przebiegiem włókien
spęczanie
N-TR
symulacja MES
optymalizacja procesu
heavy crankshaft
continuous grain flow forging
upset forging
FE simulation
process optimization
Opis:
Autorzy przedstawili metodę N-TR (nowa TR) będącą nowym procesem kucia ciężkich, jednolitych wałów korbowych z ciągłym przebiegiem włókien. W metodzie N-TR mechaniczne sprzężenie spęczania z równoczesnym wyginaniem, spowodowane działaniem mechanizmu kolanowego w metodzie TR, zostało zlikwidowane dzięki zastosowaniu siłownika powodującego niezależne wyginanie, co umożliwia optymalizację procesu kucia. Przeprowadzono optymalizację procesu kucia ciężkiego wału korbowego typu 601 metodą N-TR korzystając z symulacji MES w programie DEFORM-3D. Badano związek stopnia wypełnienia wykrojów narzędzi z prędkością wyginania. Stwierdzono, że niższa prędkość wyginania na początku procesu i wyższa prędkość wyginania na końcu procesu sprzyjają wypełnieniu wykrojów. Uzyskano optymalne wypełnienie wykrojów narzędzi dla technicznie realnych prędkości wyginania.
N-TR (new TR) is a new continuous grain flow forging process for solid heavy crankshafts forming proposed by the authors. In N-TR process, the mechanical coupling of upsetting and bending action via the toggle mechanism in TR process is decoupled by an independent additional cylinder to provide bending action, which provides the feasibility of process optimization. In this paper, a heavy crankshaft modeled 601 was selected as a case study to optimize the N-TR process with FE simulation in DEFORM-3D. Relationship of die filling versus bending speed-stroke parameters was set up from the simulations, which shows that lower bending speed in the beginning stage and higher speed in the ending stage benefit die filling. Optimum die filling and engineering feasible speed-stroke parameters was acquired.
Źródło:
Obróbka Plastyczna Metali; 2006, 17, 2; 3-13
0867-2628
Pojawia się w:
Obróbka Plastyczna Metali
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PP2A phosphatase interacts with CPK kinase and regulates pathogenesis responses triggered by intracellular ROS signals
Autorzy:
Kangasjarvi, S.
Denessiouk, K.
Trotta, A.
Konert, G.
Rahikainen, M.
Li, S.
Mhamdi, A.
Noctor, G.
Powiązania:
https://bibliotekanauki.pl/articles/80995.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
protein phosphatase 2A
calcium-dependent protein kinase
reactive oxygen species
organelle
protein kinase
plant immunity
Arabidopsis
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression and immunological evaluation of elongation factor Tu of Streptococcus suis serotype 2
Autorzy:
Xia, X.J.
Wang, L.
Cheng, L.K.
Shen, Z.Q.
Li, S.G.
Wang, J.L.
Powiązania:
https://bibliotekanauki.pl/articles/31256.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Streptococcus suis serotype 2 (SS2) is considered as a major pathogen that causes sepsis and meningitis in piglets and humans, but knowledge of its antigenic proteins remains limited so far. The surface-related proteins of pathogens often play significant roles in bacterium-host interactions and infection. Here, we obtained the elongation factor Tu (EF-Tu) gene of Streptococcus suis and constructed the recombinant expression plasmid successfully. The target recombinant plasmid was then expressed in Escherichia coli and the immuno-protection of the recombinant protein was subsequently evaluated as well. The EF-Tu gene of Streptococcus suis is 1197 bp in length, encodes 398 amino acids. The target recombinant EF-Tu (rEF-Tu) protein can recognize the antiserum of Streptococcus suis and can provoke obvious humoral immune responses in rabbits and conferred protection to rabbits against Streptococcus suis ear-vein challenge, implying that the EF-Tu may be used as an attractive candidate antigen for a component of subunit vaccine.
Źródło:
Polish Journal of Veterinary Sciences; 2017, 20, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green ultrasound-assisted extraction of anthocyanin and phenolic compounds from purple sweet potato using response surface methodology
Autorzy:
Zhu, Z.
Guan, Q.
Guo, Y.
He, J.
Liu, G.
Li, S.
Barba, F.J.
Jaffrin, M.Y.
Powiązania:
https://bibliotekanauki.pl/articles/24695.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
ultrasound
extraction
anthocyanin
phenolic compound
sweet potato
response surface methodology
Źródło:
International Agrophysics; 2016, 30, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pharmacokinetics of the recombinant ovine interferon-tau in lambs
Autorzy:
Zhao, J.
Yu, H.Y.
Zhao, Y.
Li, S.Q.
Fu, X.L.
Zhou, W.
Xia, B.B.
Wang, M.L.
Chen, J.
Powiązania:
https://bibliotekanauki.pl/articles/2087588.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bioavailability
ovine interferon-τ
cytopathic effect inhibition assay
pharmacokinetic study
Źródło:
Polish Journal of Veterinary Sciences; 2019, 1; 75-82
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanism of Radiative Mn$\text{}^{2+}$ Intra-Shell Recombination in Bulk ZnMnS
Autorzy:
Ivanov, V. Yu.
Godlewski, M.
Yatsunenko, S.
Khachapuridze, A.
Li, M. S.
Gołacki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2027501.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
76.30.Fc
76.70.Hb
78.55.Et
Opis:
Origin of a fast component of the photoluminescence decay of Mn$\text{}^{2+}$ intra-shell $\text{}^{4}$T$\text{}_{1}$ → $\text{}^{6}$A$\text{}_{1}$ transition is discussed based on the results of photoluminescence, photoluminescence kinetics and optically detected magnetic resonance experiments performed for bulk ZnMnS samples with about 1% Mn fraction. It is demonstrated that a fast component of the photoluminescence decay, reported previously for quantum dot structure and related to quantum confinement effects, is also observed in bulk samples and is related by us to very efficient spin cross-relaxation effects.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 351-355
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Key factors governing fibril formation of proteins: insights from simulations and experiments
Autorzy:
Co, N. T.
Viet, M. H.
Truong, P. M.
Kouza, M.
Li, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/1954243.pdf
Data publikacji:
2022-02-01
Wydawca:
Politechnika Gdańska
Tematy:
tworzenie włókienek
swobodna energia wiązania
fibre formation
binding free energy
Opis:
Fibril formation of proteins and peptides is associated with a large group of major human diseases, including Alzheimer’s disease, prion disorders, amyotrophic lateral sclerosis, type 2 diabetes, etc. Therefore, understanding the key factors that govern this process is of paramount importance. The fibrillogenesis of polypeptide chains depends on their intrinsic properties as well as on the external conditions. In this mini-review we discuss the relationship between fibril formation kinetics and the sequence, aromaticity, hydrophobicity, charge and population of the so called fibril-prone conformation in a monomer state. The higher the population, the faster is the fibril elongation and this dependence may be described by a single exponential function. This observation opens up a new way to understand the fibrillogenesis of bio-molecules at the monomer level. We will also discuss the influence of the environment with focus on the recently observed dual effect of crowders on the aggregation rat es of polypeptide chains.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2014, 18, 3; 245--254
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on Stripping-down TNT from Waste Munitions by Supercritical CO2 Fluid Extraction under Low Temperature Conditions
Autorzy:
Yang, T.-M.
Li, J.-S.
Su, C.-S.
Lu, K.-T.
Yeh, T.-F.
Powiązania:
https://bibliotekanauki.pl/articles/358681.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
treatment of waste munitions
supercritical fluid extraction technique
TNT
stripping-down
low temperature conditions
Opis:
The traditional methods of waste munitions treatment are expensive and also have potential risks during the treatment process. The supercritical fluid extraction technique has been a rapidly developing technique in the chemical industry in recent years. CO2 is used as the solvent, which has some advantages, such as low pollution, low cost, good chemical stability and can be operated under low temperature conditions. This research explored the feasibility of reclaiming TNT from waste munitions by supercritical CO2 fluid extraction. It was found interestingly that the melting point of TNT can be lowered in supercritical CO2 fluid. Therefore, the melting process of TNT was observed under different temperature and pressure conditions to determine the best operating conditions for stripping-down TNT from waste munitions. Afterwards, simulated warheads with weight loadings of 60 g, 500 g and 1 kg of TNT were prepared and stripping-down tests from the simulated warheads were carried out using supercritical CO2 fluid at temperatures lower than the normal melting point of TNT. The results showed that TNT could be completely removed from the simulated warheads and the optimum operating conditions were determined as 55 °C and 25 MPa. This study will contribute to the feasibility evaluation of stripping-down TNT-based high explosives.
Źródło:
Central European Journal of Energetic Materials; 2018, 15, 1; 191-205
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge-Density-Wave Origin of Dip-Hump Structures in the Tunnel Spectra of Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$
Autorzy:
Ekino, T.
Gabovich, A. M.
Li, M. S.
Pękała, M.
Szymczak, H.
Voitenko, A. I.
Powiązania:
https://bibliotekanauki.pl/articles/2047318.pdf
Data publikacji:
2007-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.Jn
71.45.Lr
74.50.+r
74.81.-g
Opis:
We calculated the differential conductance G as the function of the bias voltage V across the tunnel junction between a normal metal or a conventional superconductor and an inhomogeneous superconductor with charge density waves. Spatial averaging over random domains with varying superconducting and normal state properties was carried out. For high-T$\text{}_{c}$ oxides, irregularly distorted charge density wave patterns with spatially scattered values of various parameters were earlier shown to manifest themselves in a great body of experimental data. The results of calculation were applied to explain the well-known dip-hump structure in the G(V) dependence for Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+δ}$ and other cuprates.
Źródło:
Acta Physica Polonica A; 2007, 111, 4; 573-580
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of temperature and nitrogen deprivation on cell morphology and physiology of Symbiodinium
Autorzy:
Pasaribu, B.
Li, Y.-S.
Kuo, P.-C.
Lin, I.-P.
Tew, K.-S.
Tzen, J.T.C.
Liao, Y.K.
Chen, C.-S.
Jiang, P.-L.
Powiązania:
https://bibliotekanauki.pl/articles/49111.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Źródło:
Oceanologia; 2016, 58, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the Mechanical Properties and Curing Networks of Energetic GAP/TDI Binders
Autorzy:
Ma, S.
Li, Y.
Li, G.
Luo, Y.
Powiązania:
https://bibliotekanauki.pl/articles/358300.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
glycidyl azide polymer (GAP)
curing networks
hydrogen bonding
entanglement
integrity
Opis:
This research focused on correlations between the macroscopic mechanical performance and microstructures of energetic binders. Initially a series of glycidyl azide polymer (GAP)/toluene diisocyanate (TDI) binders, catalyzed by a mixture of dibutyltin dilaurate (DBTDL) and triphenyl bismuth (TPB), was prepared. Uniaxial tensile testing, and low-field nuclear magnetic resonance and infrared spectroscopy were then used to investigate the mechanical properties, curing networks, and hydrogen bonding (H-bonds) of these binders. Additionally, a novel method based on the molecular theory of elasticity and the statistical theory of rubber elasticity was used to analyze the integrity of the networks. The results showed that the curing parameter R strongly influences the mechanical properties and toughness of the binders, and that a tensile stress (σm) of 1.6 MPa and an elongation (εm) of 1041% was observed with an R value of 1.6. The cross-linking density increased sharply with the curing parameter, but only modestly with an R value ≥ 1.8. The proportion of H-bonds formed by the imino groups increased with the R value and reached 72.61% at an R value of 1.6, indicating a positive correlation between the H-bonds and σm. Molecular entanglement was demonstrated to increase with R and to contribute dramatically to the mechanical performance. The integrity of these networks, evaluated by a correction factor (A), varies with R, and a network of the GAP/TDI binder with an R value of 1.6 is desirable.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 3; 708-725
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Four stage hybrid constructed wetlands treating low-strength aquaculture wastewater with and without artificial aeration
Autorzy:
Zhang, S.-Y.
Li, G.
Li, X.
Tao, L.
Powiązania:
https://bibliotekanauki.pl/articles/207748.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wastewater treatment
aquaculture
water pollution
wetlands
aquaculture wastewater
artificial aeration
oczyszczanie ścieków
akwakultura
zanieczyszczenie wody
mokradła
sztuczne napowietrzanie
tereny podmokłe
Opis:
Driven by the booming demands for healthy food, aquaculture industry has to deal with the problem of water pollution appropriately so as to achieve sustainable development. In this study, a combination of four stage CWs (three horizontal subsurface flows followed by one free water surface flow) was configured to treat low-strength aquaculture wastewater. For performance assessment, the wetlands were monitored over three years, during which artificial aeration was added to them. By the results, the organic matters and nutrients were mainly sequestered in the anterior subsurface flows, while the surface flow mainly contributed to DO improvement. These results probably implied no necessity of excessive subsurface flows connected in a staged manner. In addition, the artificial aeration improved the treatment performance on ammonium-N, TN and TP in the first-stage CW.
Źródło:
Environment Protection Engineering; 2015, 41, 3; 31-42
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation of the preparation and performance of microcellular combustible material
Autorzy:
Yang, W.
Li, Y.
Ying, S.
Powiązania:
https://bibliotekanauki.pl/articles/358391.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
microcellular combustible material
supercritical CO2
pressure quench method
vulnerability behaviour
closed vessel test
Opis:
Microcellular combustible materials, based on poly(methyl methacrylate) (PMMA) bonded RDX, were fabricated by the pressure quench method using supercritical CO2. After foaming, the bulk density, porosity, expansion ratio and cell density were analyzed. Scanning Electron Microscopy (SEM) has also been used to investigate the influence of the foaming conditions (temperature, saturation pressure and depressurization time) and the RDX ratio on the porous structure. The skin-core structure was also observed after the pressure quench process. The mechanical sensitivities and burning performance were investigated by the friction sensitivity test, the impact sensitivity test and the closed vessel test, respectively.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 2; 257-269
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement and analysis of coastal waves along the north sea area of China
Autorzy:
Sun, S.
Li, H.
Sun, H.
Powiązania:
https://bibliotekanauki.pl/articles/259794.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
coastal wave
measurement
buoy
spectral analysis
Opis:
Taking advantage of coastal wave environment to carry out scaled ship model test is an effective testing technology for ship performance. In this paper, the method of spectral analysis is adopted to calculate the significant wave height, period, wave spectrum and some other parameters of some places along the North Sea area of China. The measured wave spectrum and the ocean spectrum are handled into non-dimensional form to evaluate their similarity. The influence of wind direction and tide on coastal waves was analyzed. And the results indicate that the coastal wave spectrum is similar to the ocean spectrum under some specific conditions.
Źródło:
Polish Maritime Research; 2016, 3; 72-78
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on green water of tumblehome hull using dam-break flow and RANSE models
Autorzy:
Sun, S.
Du, W.
Li, H.
Powiązania:
https://bibliotekanauki.pl/articles/259806.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
tumblehome hull
Green water
Dam-break flow
RANSE
Opis:
The tumblehome hull adopts some novelty designs such as low-tumblehome freeboard and wave-piercing bow. The new form design makes the ship have many special hydrodynamic performances. Especially the green water of tumblehome hull is different from that of hulls with flare free board. Green water is a strong nonlinear phenomenon of ship-wave interaction, the variation of free surface of liquid is complicated, and there are still some difficulties to solve green water problems well with numerical simulation method. In this paper firstly the motion responses of the tumblehome hull was calculated based on 3D potential theory, and then the dam-break flow model was used to calculate green water height and pressure distribution. According to the result of numerical simulation, some typical working conditions are chosen for 3D CFD simulation using RANS method. The results of numerical simulation methods are compared with the experimental results measured in towing tank. The influence of different ship form parameters and wave parameters to the green water of tumblehome hull is analyzed, and some regularities of green water on tumblehome hull in regular waves are summarized.
Źródło:
Polish Maritime Research; 2017, S 2; 172-180
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experiment on pressure characteristics of submerged floating tunnel with different section types under wave condition
Autorzy:
Li, Q.
Jiang, S.
Chen, X.
Powiązania:
https://bibliotekanauki.pl/articles/260098.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
submerged floating tunnel
section type
irregular waves
pressure characteristics
physical test
Opis:
Submerged floating tunnel (SFT for short) is a special underwater traffic structure, and wave load is one of the main environmental loads of SFT structure. In this paper, the 1:60 physical model test of three kinds of SFT in a two-dimensional wave flume is tested. The effects of random irregular waves on the SFT structure under different wave heights and periods are discussed. The study shows that: (1) Compared with circular and polygonal sections, there are multiple local peaks in the elliptical section during the period. with the increase of wave height, the number of local peaks also increases. It suggests that the rotational moment plays an important role in the elliptical section which has a relatively small depth-width ratio. (2) The position of the maximum and minimum pressure in the three kinds of SFT sections is consistent. Their vertical wave forces are all larger than their horizontal wave forces. The increase of vertical wave force relative to horizontal wave force in polygon section is larger than that in elliptical section, and the difference in the circular section is the smallest. (3) Under the same traffic condition, the wave force of the elliptical and polygon section is smaller, but they are more sensitive to the change of wave height, and the increase is obvious. The distribution of wave force in the circular section is more uniform.
Źródło:
Polish Maritime Research; 2018, S 3; 54-60
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic strength and accumulated plastic strain development laws and models of the remolded red clay under long-term cyclic loads: laboratory test results
Autorzy:
Li, J.
Chen, S.
Jiang, L.
Powiązania:
https://bibliotekanauki.pl/articles/260238.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
remolded red clay
dynamic property
dynamic strength
accumulated plastic strain
Opis:
The dynamic strength and accumulated plastic strain are two important parameters for evaluating the dynamic response of soil. As a special clay, the remolded red clay is often used as the high speed railway subgrade filling, but studies on its dynamic characteristics are few. For a thorough analysis of the suitability of the remolded red clay as the subgrade filling, a series of long-term cyclic load triaxial test under different load histories are carried out. Considering the influence of compactness, confining pressure, consolidation ratio, vibration frequency and dynamic load to the remolded red clay dynamic property, the tests obtain the development curves of the dynamic strength and accumulated plastic strain under different test conditions. Then, through curve fitting method, two different hyperbolic models respectively for the dynamic strength and accumulated plastic strain are built, which can match the test datum well. By applying the dynamic strength model, the critical dynamic strength of the remolded red clay are gained. Meanwhile, for providing basic datum and reference for relevant projects, all key parameters for the dynamic strength and accumulated plastic strain of the remolded red clay are given in the paper.
Źródło:
Polish Maritime Research; 2015, S 1; 89-94
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust adaptive fuzzy filters output feedback control of strict-feedback nonlinear systems
Autorzy:
Tong, S.
Liu, C.
Li, Y.
Powiązania:
https://bibliotekanauki.pl/articles/908148.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system nieliniowy
sterowanie rozmyte
sprzężenie zwrotne
nonlinear system
adaptive fuzzy control
backstepping
small-gain approach
K-filters
Opis:
In this paper, an adaptive fuzzy robust output feedback control approach is proposed for a class of single input single output (SISO) strict-feedback nonlinear systems without measurements of states. The nonlinear systems addressed in this paper are assumed to possess unstructured uncertainties, unmodeled dynamics and dynamic disturbances, where the unstructured uncertainties are not linearly parameterized, and no prior knowledge of their bounds is available. In recursive design, fuzzy logic systems are used to approximate unstructured uncertainties, and K-filters are designed to estimate unmeasured states. By combining backstepping design and a small-gain theorem, a stable adaptive fuzzy output feedback control scheme is developed. It is proven that the proposed adaptive fuzzy control approach can guarantee the all the signals in the closed-loop system are uniformly ultimately bounded, and the output of the controlled system converges to a small neighborhood of the origin. The effectiveness of the proposed approach is illustrated by a simulation example and some comparisons.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 4; 637-653
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Process improvement and kinetic study on copper leaching from low-grade cuprite ores
Autorzy:
Bai, S.
Fu, X.
Li, C.
Wen, S.
Powiązania:
https://bibliotekanauki.pl/articles/109660.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cuprite
dissolution kinetics
sulfuric acid leaching
SCM
Opis:
Process improvement and kinetic study on copper leaching from low-grade cuprite ores in sulfuric acid solution are presented in this paper. Effects of major leaching parameters on copper leaching efficiency are determined. The results indicate that copper minerals in the raw ores are mainly cuprites. The reaction rate of this ore increases with an increase in temperature, reaction time, sulfuric acid concentrations and decrease in the particle size of ore. Leaching of about 92.5% of copper is achieved using 0.125-0.074 mm ore particle size at a reaction temperature of 353 K for 180 min reaction time with 150 g/dm3 sulfuric acid. The solid/liquid ratio was maintained constant at 1:15. Leaching kinetic indicates experimental data complies with shrinking core mode (SCM). It is found in the study that agitation rate is not an influential factor on leaching rate and that the dissolution rate is controlled by surface chemical reaction. The average activation energy of the process is determined to be 45.28 kJ mol-1, and the reaction order of H2SO4 is 0.8093.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 300-310
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite-time adaptive modified function projective multi-lag generalized compound synchronization for multiple uncertain chaotic systems
Autorzy:
Li, Q.
Liu, S.
Chen, Y.
Powiązania:
https://bibliotekanauki.pl/articles/331032.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
finite-time adaptive control
unknown parameter
chaotic system
sterowanie adaptacyjne
parametr nieznany
układ chaotyczny
Opis:
In this paper, for multiple different chaotic systems with fully unknown parameters, a novel synchronization scheme called ‘modified function projective multi-lag generalized compound synchronization’ is put forward. As an advantage of the new method, not only the addition and subtraction, but also the multiplication of multiple chaotic systems are taken into consideration. This makes the signal hidden channels more abundant and the signal hidden methods more flexible. By virtue of finite-time stability theory and an adaptive control technique, a finite-time adaptive control scheme is established to realize the finite-time synchronization and to properly evaluate the unknown parameters. A detailed theoretical derivation and a specific numerical simulation demonstrate the feasibility and validity of the advanced scheme.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 4; 613-624
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Foreshadow prediction of coal and gas outbursts based on a weighted first-order local-region method
Prognozowanie wyrzutów gazu i węgla na podstawie ważonej metody lokalnej pierwszej potęgi
Autorzy:
Li, Z. Q.
Liu, Z.
Yuan, S.
Powiązania:
https://bibliotekanauki.pl/articles/348565.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ważona metoda lokalna pierwszej potęgi
wyrzuty węgla i gazu
chaotyczny szereg czasowy
prognozowanie wyrzutów
weighted first-order local-region method
coal and gas outbursts
chaotic time series
outburst prediction
Opis:
This paper presents a method for the foreshadow prediction of coal and gas outburst. It was hypothesized that the gas emission prior to coal and gas outburst was nonlinear and the chaotic time series could be used in the short-term prediction. The weighted first-order local-region method was used to analyze the historical monitored gas emission data prior to the coal and gas outburst in a coal mine. The phase space of gas emission time series was reconstructed according to Takens' theory and a dynamic mathematical model of prediction was constructed. Then, the model was applied to predict the gas emission and the results were good. More than 75 percent of the predictive value error constitutes less than 1 percent. The results show that the weighted first-order local-region method is much more precise than some prediction methods and it is also easy to operate. So it is good in application and provides an effective method for coal and gas outburst prediction based on the obviously nonlinear gas emission data.
Niniejsza publikacja przedstawia metodę prognozowania wyrzutów węgla i gazu. Z postawionych hipotez wynika, że emisja gazu, do której dochodzi przed wyrzutem węgla i gazu, ma przebieg nieliniowy, a chaotyczny szereg czasowy może być wykorzystywany w prognozach krótkoterminowych. Do analizy danych historycznych monitorowanej emisji gazu przed wyrzutem węgla i gazu w kopalni zastosowano ważoną metodę lokalną pierwszej potęgi. Przestrzeń fazową szeregu czasowego emisji gazu zrekonstruowano na podstawie twierdzenia Takensa, a następnie sporządzono dynamiczny model matematyczny prognozy. Model ten wykorzystano do prognozy emisji gazu. Wyniki testu były zadowalające. 75 procent błędu wartości prognozowanej stanowi mniej niż 1 procent. Wyniki pokazują, że ważona metoda lokalna pierwszej potęgi jest o wiele bardziej precyzyjna niż wiele innych metod prognostycznych. Ponadto jest ona łatwa do zastosowania. Prostota i skuteczność tej metody czyni ją odpowiednią do prognozowania wyrzutów węgla i gazu na podstawie nieliniowych danych emisji gazu.
Źródło:
AGH Journal of Mining and Geoengineering; 2012, 36, 3; 217-223
1732-6702
Pojawia się w:
AGH Journal of Mining and Geoengineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical analysis and research of the conveyor belt of plane turning belt conveyor based on discrete element method
Autorzy:
Li, D. Y.
Wang, S.
Hu, K.
Powiązania:
https://bibliotekanauki.pl/articles/224069.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
przenośnik taśmowy
siła taśmy przenośnikowej
metoda elementów dyskretnych
optymalizacja
belt conveyor
conveyor belt force
Discrete Element Method
optimization design
Opis:
In view of the size and the change of the load force of the conveyor belt at the turning point of the plane turning belt conveyor, the influencing factors of the stress of the conveyor belt at the turning point of the plane turning belt conveyor under full load condition are analyzed. A three dimensional model of the turning point of the plane turning belt conveyor is established. Combined with previous research experience, the formula for calculating the load is put forward. Based on discrete element method, multiple sets of internal curve elevation angle and the belt speed are used for dynamic simulation analysis. The results showed that the middle of conveyor belt is the most stressed, the lateral force second, the force of the inner conveyor belt is the least. Outside force increases with the increase of speed; there is no change in the middle band; the inner band force decreases with the increase of the velocity. Outside force decreases with the decrease of the inclination angle. With the change of the inclination angle, the force is basically unchanged. With the decreasing of the inclination angle, the force increases gradually. By optimizing the design parameters of the plane turning belt conveyor, the force of belt is reduced, and the service life of belt is improved.
Źródło:
Archives of Transport; 2017, 41, 1; 55-62
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel method to extract vanadium from high-grade vanadium slag: non-salt roasting and alkaline leaching
Autorzy:
Liu, B.
Meng, L.
Zheng, S.
Li, M.
Wang, S.
Powiązania:
https://bibliotekanauki.pl/articles/110480.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high-grade vanadium slag
cleaner production
non-salt roasting
alkaline leaching
mechanisms
Opis:
A new method using non-salt roasting-alkaline leaching to treat vanadium slag was proposed in this study. The V(III) in vanadium slag is oxidized to V(V) by roasting and the latter can be effectively leached out as vanadate by alkaline leaching. This method possesses distinct advantage of being able to treat high-grade vanadium slag. For the South Africa high-grade vanadium slag, the maximum vanadium recovery of 98% was achieved when the reaction conditions were roasting temperature of 850 °C, roasting time of 2 h, alkali concentration of 30 wt.%, leaching temperature of 210 °C, and leaching time of 2 h. The roasting and leaching mechanisms have been well elucidated based on the XRD and SEM analysis results. The phases transitions of vanadium slag were clearly presented. This work has laid the foundation for the industrial application of non-salt roasting-alkaline leaching and provided new insights into effective extraction of high-grade vanadium slag.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 657-667
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An innovative methodology for recycling iron from magnetic preconcentrate of an iron ore tailing
Autorzy:
Yu, J.
Han, Y.
Gao, P.
Li, Y.
Yuan, S.
Li, W.
Powiązania:
https://bibliotekanauki.pl/articles/110888.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetic preconcentrate
iron ore tailing
iron recycling
fluidized magnetization roasting
magnetic separation
Opis:
Iron ore tailing is a kind of hazardous solid waste produced by iron and steel industry. In order to separate and recycle iron from the magnetic preconcentrate of an iron ore tailing, an innovative technological route of fluidized magnetization roasting followed by low-intensity magnetic separation was proposed in this paper. The effects of roasting temperature, dosages of reducing gas CO and fluidizing gas N2 on recovery rate of iron were carried out and optimized. The results showed that the hematite was almost reduced to magnetite by a gas mixture of 4 m3/h CO and 1 m3/h N2 at roasting temperature of 540 °C. Under the optimized conditions, a magnetic concentrate assaying 61.4 wt% Fe with a recovery rate of 81.8% was obtained from the magnetic preconcentrate of an iron ore tailing. The iron chemical phase, X-ray diffraction (XRD), and optical metallographic microscope analyses revealed that siderite was converted to magnetite successfully after roasting, and some coarse magnetite-hematite interlocking particles were formed due to insufficient reaction time, which could also be recovered by magnetic separation after liberating from gangue minerals.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 668-676
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced studies on coal injection into a cavitation cell for the purpose of comminution
Badania procesu wtłaczania węgla do komór kawitacyjnych w celu rozdrabniania
Autorzy:
Galecki, G.
Akar, G.
Sen, S.
Li, Y.
Powiązania:
https://bibliotekanauki.pl/articles/219516.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
struga wody
węgiel
rozdrabnianie
wykresy Rosina-Rammlera
waterjet
coal
comminution
Rosin-Rammler plots
Opis:
In this study, the effect of coal comminution with waterjets enhanced by cavitation was investigated. The experiments were carried out using mono-size coal feeds in a batch closed circuit, in a specially designed cell to induce cavitation at 69 MPa inlet pressure and back pressures of zero and 0.345 MPa. Test results were evaluated on the product calculated surface area and the Rosin-Rammler parameters. The experiments showed that the maximum particle size reduction was achieved during the first run through the comminution circuit operated without back pressure. However, a decreasing tendency in comminution efficiency was noted with the number of runs through the system. The use of 0.345 MPa back pressure resulted in a wider size distribution of the product.
W pracy przedstawiono badanie procesu rozdrabniania węgla przy pomocy dysz wodnych, wspomaganego przez kawitację. Eksperymenty prowadzono na partiach brył węgla o jednakowych rozmiarach, w układzie zamkniętym, w specjalnej komorze kawitacyjnej przystosowanej do działania przy ciśnieniu wlotowym 69 MPa i przy przeciwciśnieniu zero i 0.345 MPa. Wyniki eksperymentu określono na podstawie obliczeń pól powierzchni, przy wykorzystaniu parametrów Rosina-Rammlera. Eksperymenty wykazały, że maksymalną redukcję rozmiarów ziaren węglowych uzyskuje się w trakcie pierwszej próby dokonanej w komorze bez zastosowania przeciwciśnienia. Z każdym kolejnym przebiegiem obserwowano malejącą skuteczność rozdrabniania. Zastosowanie przeciwciśnienia rzędu 0.345 MPa spowodowało większy rozrzut wymiarów ziaren w produkcie końcowym.
Źródło:
Archives of Mining Sciences; 2012, 57, 3; 769-778
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Salicylic acid induces physiological and biochemical changes in peony under waterlogging stress
Autorzy:
Zhu, X.
Shi, H.
Li, X.
Jin, S.
Powiązania:
https://bibliotekanauki.pl/articles/12703759.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
In this study, the effects of salicylic acid to antioxidative activity and photosynthetic characteristics in waterlogging stress of two peony cultivars (‘Fengdanbai’ and ‘Mingxing’) were investigated. 4-year-old peony grown in different levels of waterlogging stress and then different concentration prepared SA (0.0, 0.1, 0.5 and 1.0 mmol L⁻¹) sprayed on fresh leaves of peony. The antioxidative enzymes activities include superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), chlorophyll content, relative conductivity and MDA content were measured in leaves about different waterlogging treatment, the photosynthetic characteristics were also measured using photosynthetic measurement system. The results showed that waterlogging stress decreased the chlorophyll content in all peony cultivars leaves, but with SA treatment can inhibit the decrease of chlorophyll content. Relative conductivity increased as the extension of waterlogging time in two cultivars. SA treatment could effectively inhibit the increase of relative conductivity, and 0.5 mmol L⁻¹ of SA was the most suitable concentration. SOD, POD, CAT activity increased first and then decreased in different waterlogging condition, SA significantly increased the activity of various enzymes. MDA content was increase as the expansion of waterlogging time in two cultivars. SA inhibits the increase of MDA content. Of all concentration of SA, 0.5 mmol L⁻¹ was the best concentration to inhibit the waterlogging stress. For the photosynthetic characteristics, the net assimilation rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) and intercellular CO₂ (Ci) were decreased under different waterlogging condition. SA treatment can increase Pn, Gs, Tr and Ci of peony.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 1; 41-52
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and test of a new high-current electronic current transformer with a Rogowski coil
Autorzy:
Zhang, M.
Li, K.
He, S.
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/221051.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Rogowski coil
high-current
electronic current transformers
electrical measurements
Opis:
This paper describes the design and test of a new high-current electronic current transformer based on a Rogowski coil. For better performances, electronic current transformers are used to replace conventional electro-magnetic inductive current transformers based on ferromagnetic cores and windings to measure high-current on the high voltage distribution grids. The design of a new high-current electronic current transformer is described in this paper. The principal schemes of the prototype and partial evaluation results are presented. Through relative tests it is known that the prototype has a wide dynamic range and frequency band, and it can allow high accuracy measurements.
Źródło:
Metrology and Measurement Systems; 2014, 21, 1; 121-132
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural filling and systematic roof control technology for gob-side entry retaining in steep coal seams
Naturalne podsadzanie stropu i metoda systemowego prowadzenia stropu przy utrzymaniu chodników przewozowych od strony zrobów w nachylonych pokładach węgla
Autorzy:
Yang, H.
Cao, S.
Zhou, G.
Zhao, Y.
Li, G.
Li, Y.
Fan, Y.
Powiązania:
https://bibliotekanauki.pl/articles/220162.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
utrzymanie chodnika przewozowego
nachylone pokłady węgla
naturalne podsadzanie
projekt systemowy
gob-side entry retaining
steep coal seams
natural filling
systematic project
Opis:
The technology for gob-side entry retaining in steep coal seams is still in the development stage. The analysis results of the caving structure of main roof, low influence of gateway’s stability because of long filling distance and weak dynamic effect of the gateway, and the low stress redistribution environment indicate that using this technology in steep coal seams has significant advantages. Moreover, to reinforce the waste rock and the soft floor and to better guard against the impact of the waste rock during natural filling, a rock blocking device and grouting reinforcement method were invented, and theoretical calculations result show that the blocking device has high safety factor. In addition, we also developed a set of hydraulic support devices for use in the strengthening support zone. Furthermore, because the retaining gateway was a systematic project, the selection of the size and shape of the gateway cross section and its support method during the initial driving stage is a key step. Thus, first, a section the size of bottom width and roof height of a new gateway was determined to meet any related requirements. Then, according to the cross sections of 75 statistical gateways and the support technique, it chosen a trapezoidal cross section when the dip of the coal seam is […], a special and an inclined arch cross section when […]. Eventually, a support system of bolts and cables combined with steel mesh and steel belts was provided. The support system used optimized material and improved parameters, can enhanced the self-bearing ability of the surrounding coal and rock masses.
Technologia utrzymywania chodników w obszarze zrobów w nachylonych pokładach węgla jest nadal rozwijana i udoskonalana. Jej zastosowanie prowadzi do zawału głównego stropu, który jednak w nieznacznym tylko stopniu wpływa na stabilność chodników z uwagi na odległość obszaru podsadzania, podczas gdy oddziaływania dynamiczne na chodniki przewozowe będą niewielkie. Powstały rozkład naprężeń wskazuje, że zastosowanie tej technologii w stromych pokładach przyniesie znaczne korzyści. Ponadto, w celu wzmocnienia warstw skał płonnych i miękkich warstw spągowych, a także dla lepszego zabezpieczenia przed skutkami ruchów skał płonnych w trakcie podsadzania, opracowano urządzenia blokujące ruch skał wraz ze wzmocnieniem cementowym. Obliczenia teoretyczne wskazują że zastosowana blokada ruchów skał charakteryzuje się wysokim wskaźnikiem bezpieczeństwa. Ponadto, opracowano także zestaw wsporników hydraulicznych dla dodatkowego wzmocnienia strefy podsadzania. Z uwagi na to, że zachowanie chodnika przewozowego jest działaniem stałym i systematycznym, dobór wymiarów i kształtu przekroju chodnika oraz metody jego stabilizacji jest sprawą kluczową już na etapie drążenia chodnika. W kroku pierwszym określono więc szerokość chodnika w jego dolnej części oraz wysokość stropu zgodnie z odpowiednimi wymogami. Następnie w oparciu o wymiary przekrojów 75 statystycznych chodników oraz uwzględniając dostępne techniki stabilizacji stropu wybrano przekrój trapezoidalny gdy nachylenie pokładu węgla mieści się w przedziale […], zaś dla kątów nachylenia w przedziale […] wybrano nachylony profil łukowy. W etapie końcowym zastosowano układ stabilizujący oparty na kotwach i kablach połączonych siatka stalową i stalowymi taśmami. W systemie stabilizującym wykorzystano zoptymalizowane materiały zapewniając lepsze parametry pracy, co korzystanie wpłynie na nośność warstw górotworu w otoczeniu pokładu węgla.
Źródło:
Archives of Mining Sciences; 2018, 63, 3; 599-616
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved method for phase wraps reduction in profilometry
Autorzy:
Du, G.
Wang, M.
Zhou, C.
Si, S.
Li, H.
Lei, Z.
Li, Y.
Powiązania:
https://bibliotekanauki.pl/articles/173793.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phase unwrapping
zero-padding
Fourier transform
carrier-frequency
profilometry
Opis:
In order to completely eliminate, or greatly reduce the number of phase wraps in 2D wrapped phase map, Gdeisat and co-workers proposed an algorithm, which uses shifting the spectrum towards the origin. But the spectrum can be shifted only by an integer number, meaning that the phase wraps reduction is often not optimal. In addition, Gdeisat’s method will take much time to make the Fourier transform, inverse Fourier transform, select and shift the spectral components. In view of the above problems, we proposed an improved method for phase wraps elimination or reduction. First, the wrapped phase map is padded with zeros, the carrier frequency of the projected fringe is determined by high resolution, which can be used as the moving distance of the spectrum. And then realize frequency shift in spatial domain. So it not only can enable the spectrum to be shifted by a rational number when the carrier frequency is not an integer number, but also reduce the execution time. Finally, the experimental results demonstrated that the proposed method is feasible.
Źródło:
Optica Applicata; 2017, 47, 2; 295-306
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the gas recycling duration on the hydrocarbon recovery from gas condensate fields
Autorzy:
Matkivskyi, S.V.
Burachok, V.
Matiishyn, L.I.
Powiązania:
https://bibliotekanauki.pl/articles/24200594.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
gas condensate reservoir
condensation of heavy hydrocarbons
hydrocarbon recovery enhancement technologies
cycling process
dry gas injection period
zbiornik kondensatu gazu
kondensacja ciężkich węglowodorów
technologie zwiększania wydobycia węglowodorów
proces cykliczny
okres wtrysku suchego gazu
Opis:
Purpose: Optimization of formation pressure maintenance technologies in the development of gas condensate fields with a high initial content of condensate in the reservoir gas using numerical modelling. Design/methodology/approach: A study on the efficiency of dry gas injection for pressure maintenance in gas condensate fields was performed with the help of numerical 3D models. Key technological indicators of the reservoir development were calculated for the dry gas injection period of 12, 24, 36, 48, and 60 months. The results are presented as plots for the parameters in a study. Findings: Based on the results of the studies, it was found that the introduction of dry gas injection technology ensures that reservoir pressure is maintained at the highest level compared to the development of gas condensate reservoirs on primary depletion. Due to this, further condensate drop-out in the reservoir is slowed down, and the production of partly already condensed hydrocarbons is ensured by their evaporation into the dry gas injected from the surface. The simulation results indicate that increase in the injection duration period leads to an increase of the cumulative condensate production and hence the final hydrocarbon recovery factor. Research limitations/implications: The heterogeneity of oil and gas deposits, both in terms of area and thickness, significantly affects the efficiency of the developed hydrocarbon enhancement technologies. In order to minimize the negative impact of heterogeneity, it is necessary to conduct additional studies on the conditions of specific reservoirs or fields. Practical implications: The reservoir pressure maintenance technology implementation according to various technological schemes, as well as using various types of injection agents, will significantly intensify the development of depleted gas condensate fields with a high condensate yield. Originality/value: Statistical analysis of the simulation results identified the optimum value of the dry gas injection period into the gas condensate reservoir, which is 34.3 months for the conditions of a given reservoir in the study.
Źródło:
Archives of Materials Science and Engineering; 2022, 117, 2; 57--69
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propagation of goldenrod (Solidago canadensis L.) from leaf and nodal explants
Autorzy:
Li, J.
Kang, Y.
Qiang, S.
Peng, G.
Powiązania:
https://bibliotekanauki.pl/articles/56457.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
propagation
goldenrod
Solidago canadensis
leaf
nodal explant
callus formation
micropropagation
adventitious shoot
tissue culture
Opis:
Goldenrod (Solidago canadensis L.) is an invasive plant species in many countries except North America but a cut-flower species worldwide. There is a need to generate and propagate goldenrod clones efficiently for research and commercial purposes. A callus induction and plantlet regeneration system was developed by studying the influence of explant type and different concentrations of plant growth regulators. The highest callus production from leaf segments was obtained on Murashige and Skoog's medium (MS medium) supplemented with 1.0 mg/L naphthalene acetic acid (NAA) and 1.0 mg/L 6-benzylaminopurine (BA). Adventitious shoots could be regenerated directly from leaf explants without an intermediate callus phase with the highest shoot induction percentage of 87.2%. The largest number of adventitious shoots per leaf explant (3.2) was obtained on MS medium supplemented with 0.4 mg/L NAA and 2.0 mg/L BA. MS medium supplemented with 0.1 mg/L NAA and 1.0 mg/L BA was the best medium for axillary shoot regeneration from nodal segments. The highest root number and longest roots occurred on half-strength MS without the addition of any growth regulator. Rooted plantlets were then transferred to a soil-based growth medium, placed in a greenhouse, and acclimatized with 100% success. All surviving plants grew normally without showing any morphological variation when compared to those grow from seed. This regeneration protocol may be used to produce certain biotypes of goldenrod suitable for genetic transformation, rapid propagation of goldenrod for commercial purposes or for screening fungi and toxins as potential biocontrol agents against this weed.
Źródło:
Acta Societatis Botanicorum Poloniae; 2012, 81, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quartz enhanced photoacoustic spectroscopy based on an external cavity quantum cascade laser
Autorzy:
Xu, L.
Zhou, S.
He, T.
Li, J.
Powiązania:
https://bibliotekanauki.pl/articles/173669.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
external cavity quantum cascade laser
ECQCL
quartz enhanced photoacoustic spectroscopy
QEPAS
volatile organic compound
VOC
ethanol
Opis:
Mid-infrared laser spectroscopy is a powerful analytical tool for trace gases detection. In this study, a spectroscopic system based on an external cavity quantum cascade laser (ECQCL) and quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for volatile organic compounds (VOCs) measurements. Primary laboratory test on ethanol spectroscopy was investigated and compared with traditional direct absorption spectroscopy (DAS). Experimental results show that the proposed QEPAS is more sensitive than the conventional DAS method. In addition, the significant linear dependence of photoacoustic signal on sample pressures and laser operating parameters was observed.
Źródło:
Optica Applicata; 2018, 48, 4; 687-695
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of LNG carrier transit on fairway capacity
Autorzy:
Li, M.
Mou, J.
XinSheng, Z.
Gong, S.
Powiązania:
https://bibliotekanauki.pl/articles/135263.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
waterborne transportation
liquefied natural gas (LNG) ship
approach channel capacity
vessel traffic control
fairway capacity
LNG Port
Opis:
Liquefied natural gas (LNG), as one of the main sources of clean energy, has witnessed great growth in marine transportation in recent years. Due to the potential catastrophic consequences in case of a vessel traffic accident, the guidelines of the design of an LNG Port and the regulation of traffic management require that a mobile safety zone be set up for the transit of an LNG carrier, that is, a moving safety area around the carrier that excludes other ship traffic. To study the impact of a safety zone on channel capacity, this paper has presented a mathematical model to calculate the impact ratio of a large LNG ship on channel capacity considering different speeds and sailing modes. As a case study, an approach channel to a new LNG port that was developed in Yueqing bay, Zhejiang province, East China, has been analyzed during the concept design of the port with the aim of receiving ships with a capacity of 145,000 m3 . Based on the model, the impact ratio on the whole channel and the segmented channel when a carrier arrives at and leaves the berth has been calculated. The methodology can support the job of port design and vessel traffic management to improve the capacity, efficiency and safety of a waterway.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 56 (128); 63-70
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Effect in Semiconductor Bridge Plasma Ignition
Autorzy:
Zhang, L.
Li, N.
Wan, Z.
Zhu, S.
Powiązania:
https://bibliotekanauki.pl/articles/358252.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
SCB plasma ignition
non-heat effect
light effect
free radicals
Opis:
Heat is considered to play an important role in Semiconductor Bridge (SCB) plasma ignition. Nevertheless, in this paper a non-heat effect is reported for SCB ignition of primary explosives. An initial comparison showed that there is no reasonable correlation between the ease of plasma ignition and the 5-s explosion temperature. Meanwhile the addition of Pb3O4 was found to make lead styphnate (LS) more active to SCB plasma ignition whereas the heat decomposition of this mixture was not accelerated. In terms of the phenomena mentioned above and the response of primary explosives to SCB plasma, we propose an effect of light in SCB plasma ignition. The free radical concentration change indicates that light enhances the activity of primary explosives in SCB plasma ignition. Regarding the mixture of LS and Pb3O4, the additive itself does not make LS sensitive to the SCB plasma. However, the supplement makes LS active under light exposure. As a result, the effect of light on SCB plasma ignition was confirmed by the experiments conducted in this study. This paper provides a new understanding of SCB plasma ignition from the viewpoint of explosives, which is of importance for the design of SCBs.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 4; 996-1006
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Initiation Capacities of Conical Ring Booster Pellets
Autorzy:
Hu, L.
Hu, S.
Cao, X.
Li, J.
Powiązania:
https://bibliotekanauki.pl/articles/358594.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
booster pellet
main charge
initiation capacity
numerical simulation
optimization
Opis:
The insensitive main charge explosive is becoming an important part of modern weapon development. Insensitive main charge explosives generally have a high critical initiation pressure. The detonation pressure of a traditional cylindrical booster pellet is constant at a specific density and consequently has insufficient energy output to reliably initiate an insensitive main charge explosive. To ensure that this requirement could be achieved, the conical ring booster pellet was designed and optimized. Eight-point-synchronous explosive circuits were designed as appropriate to the sizes of the four booster pellets. The initiation processes of the four conical booster pellets equipped with the eight-point circuit were simulated using ANSYS/LY-DYNA software. The experimental measurements were performed in order to test the initiation capacities of these conical booster pellets. The results demonstrated that their initiation capacities are much better than the initiation capacity of a cylindrical booster pellet. The optimum size of the conical ring booster pellet is when the ratio of the inner to the upper diameter is 0.52, the ratio of the inner to the lower diameter is 0.44, and the ratio of the height to the lower diameter is 0.50.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 3; 335-348
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Yellowfin tuna (Thunnusalbacares) fishing ground forecasting model based on bayes classifier in the South China Sea
Autorzy:
Zhou, W.
Li, A.
Ji, S.
Qiu, Y.
Powiązania:
https://bibliotekanauki.pl/articles/258994.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Bayes classifier
South China Sea
yellowfin tuna
fishing ground forecasting
Opis:
Using the yellowfin tuna (Thunnusalbacares,YFT)longline fishing catch data in the open South China Sea (SCS) provided by WCPFC, the optimum interpolation sea surface temperature (OISST) from CPC/NOAA and multi-satellites altimetric monthly averaged product sea surface height (SSH) released by CNES, eight alternative options based on Bayes classifier were made in this paper according to different strategies on the choice of environment factors and the levels of fishing zones to classify the YFT fishing ground in the open SCS. The classification results were compared with the actual ones for validation and analyzed to know how different plans impact on classification results and precision. The results of validation showed that the precision of the eight options were 71.4%, 75%, 70.8%, 74.4%, 66.7%, 68.5%, 57.7% and 63.7% in sequence, the first to sixth among them above 65% would meet the practical application needs basically. The alternatives which use SST and SSH simultaneously as the environmental factors have higher precision than which only use single SST environmental factor, and the consideration of adding SSH can improve the model precision to a certain extent. The options which use CPUE’s mean ± standard deviation as threshold have higher precision than which use CPUE’s 33.3%-quantile and 66.7%-quantile as the threshold
Źródło:
Polish Maritime Research; 2017, S 2; 140-146
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matched-field Source Localization with a Mobile Short Horizontal Linear Array in Offshore Shallow Water
Autorzy:
Zhao, D.
Huang, Z.
Su, S.
Li, T.
Powiązania:
https://bibliotekanauki.pl/articles/177986.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
passive source localization
matched-field processing
inter-position processing
short horizontal array
shallow water
Opis:
Passive source localization in shallow water has always been an important and challenging problem. Implementing scientific research, surveying, and monitoring using a short, less than ten meter long, horizontal linear array has received considerable attention in the recent years. The short array can be conveniently placed on autonomous underwater vehicles and deployed for adaptive spatial sampling. However, it is usually difficult to obtain a sufficient spatial gain for localizing long-range sources due to its limited physical size. To address this problem, a localization approach is proposed which is based on matched-field processing of the likelihood of the passive source localization in shallow water, as well as inter-position processing for the improved localization performance and the enhanced stability of the estimation process. The ability of the proposed approach is examined through the two-dimensional synthetic test cases which involves ocean environmental mismatch and position errors of the short array. The presented results illustrate the localization performance for various source locations at different signal- to-noise ratios and demonstrate the build up over time of the positional parameters of the estimated source as the short array moves at a low speed along a straight line at a certain depth.
Źródło:
Archives of Acoustics; 2013, 38, 1; 105-113
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of colloidal montmorillonite particles on froth flotation of graphite, galena and fluorite
Autorzy:
Chen, T.
Zhao, Y.
Li, H.
Song, S.
Powiązania:
https://bibliotekanauki.pl/articles/110589.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
montmorillonite
graphite
galena
fluorite
slime coating
entrainment
Opis:
The effect of colloidal montmorillonite (MMT) on froth flotation of graphite, galena and fluorite was investigated in this work. The results showed that the presence of sufficient amount of colloidal MMT particles in the mineral slurry would be detrimental of flotation by reducing the recovery of minerals. This observation was attributed to slime coating of MMT on the coarse valuable mineral particles and entrainment of MMT particles in the froth product together with water in the triangle froth zones. The former would reduce the recovery of the valuable minerals because of hydrophilic MMT coating. The latter would decrease the concentrate grade. The degree of slime coating depended on slurry pH, while the degree of entrainment was closely related to water recovery. It was also found that slime coating was a dominant factor in mineral flotation in acidic pH regions in the presence of colloidal MMT particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 699-713
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synergism of octane phenol polyoxyethylene-10 and oleic acid in apatite flotation
Autorzy:
Cheng, R.
Li, C.
Liu, X.
Deng, S.
Powiązania:
https://bibliotekanauki.pl/articles/110793.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
octane phenol polyoxyethylene-10
synergistic effect
flotation
apatite
Opis:
The addition of octane phenol polyoxyethylene-10 (OP-10) to oleic acid via a reagent-combination technology was carried out and it was shown that OP-10 exhibited synergistic effects in the flotation performance of oleic acid. Single-mineral flotation tests, zeta-potential measurements, total-organic-carbon determination, and scale-up of continuous tests using raw ore were also carried out. Single-mineral flotation tests showed that OP-10 exhibited virtually no collecting performance for apatite, but it improved the flotation performance of oleic acid following its addition to oleic acid in small amounts at low temperature. Zeta-potential measurements and total-organic-carbon determination results indicated that the addition of 2.5% OP-10 to oleic acid increased the absolute value of the apatite surface potential and improved adsorption of oleic acid on the apatite surface at low temperature. A scale-up of the continuous test showed that application of OP-10 with industrial fatty acids led to good synergistic effects and contributed to effective separation of phosphate ore.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1214-1227
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An on-site calibration system for electronic instrument transformers based on LabVIEW
Autorzy:
Zhang, M.
Li, K.
Wang, J.
He, S.
Powiązania:
https://bibliotekanauki.pl/articles/221656.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
calibration system
electronic instrument transformers
data acquisition
data synchronization
LabVIEW
Opis:
Electronic voltage transformers (EVT) and electronic current transformers (ECT) are important instruments in a digital substation. For simple, rapid and convenient development, the paper proposed an on-site calibration system for electronic instrument transformers based on LabVIEW. In the system, analog signal sampling precision and dynamic range are guaranteed by the Agilent 3458A digital multimeter, and data synchronization is also achieved based on a self-developed PCI synchronization card. To improve the measurement accuracy, an error correction algorithm based on the Hanning window interpolation FFT has good suppression of frequency fluctuation and inter-harmonics interference. The human-computer interface and analysis algorithm are designed based on LabVIEW, and the adaptive communication technology is designed based on IEC61850 9-1/2. The calibration system can take into account pairs of digital output and analog output of the electronic voltage/current transformer calibration. The results of system tests show that the calibration system can meet the requirements of 0.2 class calibration accuracy, and the actual type test and on-site calibration also show that the system is easy to operate with convenience and satisfactory stability.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 257-270
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of intergeneric allotetraploid between autotetraploid non-heading Chinese cabbage (Brassica campestris ssp. chinensis Makino) and autotetraploid radish (Raphanus sativus L.)
Autorzy:
Sun, C.-Z.
Li, Y.
Zhang, S.-N.
Zheng, J.-S.
Powiązania:
https://bibliotekanauki.pl/articles/56661.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
intergeneric allotetraploid
autotetraploid
non-heading cabbage
Chinese cabbage
Brassica campestris ssp.chinensis
radish
Raphanus sativus
embryo culture
simple sequence repeat
Opis:
Intergeneric hybrids between non-heading Chinese cabbage (Brassica campestris ssp. chinensis Makino; 2n = 4x = 40) and radish (Raphanus sativus L.; 2n = 4x = 36) were obtained through ovary culture and embryo rescue. Some hybrid embryos (0.11 per ovary) were produced, but only 4 of them germinated. As most hybrid embryos failed to develop into plantlets directly, plants were regenerated by inducing shoots on the cultured cotyledon and inducing roots on the root induction medium. All hybrid plants were morphologically uniform. They resembled the non-heading Chinese cabbage in the long-lived habit, the plant status, the vernalization requirement and the petiole color, while the petiole shape, leaf venation pattern and flowers were more similar to those of radish. Upon examination of the flowers, these were found to have normal pistil, but rudimentary anthers with non-functional pollen grains. The somatic chromosome number of F1 plants was 38. Analysis of SSR banding patterns provided additional confirmation of hybridity.
Źródło:
Acta Societatis Botanicorum Poloniae; 2014, 83, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal vibration control of conical shells with collocated helical sensor/actuator pairs
Optymalne sterowanie drganiami powłok stożkowych za pomocą spiralnego skolokowanego układu czujnika i elementu wykonawczego
Autorzy:
Li, H.
Hu, S. D.
Tzou, H. S.
Chen, Z. B.
Powiązania:
https://bibliotekanauki.pl/articles/280352.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
smart structure
conical shell
diagonal sensor/actuator
optimal vibration control
Opis:
This paper focuses on the optimal vibration control of clamped-free conical shells using distributed helical piezoelectric sensor/actuator (S/A) pairs. Based on the independent modal space control, the response of conical shell to external excitations is represented by the summation of all participating natural modes and their respective modal participation factors, and each mode can be controlled independently. The modal equation is transformed into the linear state space form. The linear quadratic (LQ) controllers are designed for each independent mode. The optimal gain matrix is related to the ratio G∗ between the control voltage and sensing signal by the modal control force per unit voltage B2 and the sensing signal per unit displacement C1. Because B2 and C1 change with locations of the S/A pair, the optimal control effects, modal control forces and corresponding optimal control voltages are evaluated using two S/A pairs at different locations. The results indicate that the optimal control method is effective in vibration control of the shell. The optimal control effect also depends on the location of the S/A pair and modal shapes as well as the modal control force and input voltage.
W pracy skoncentrowano się na problemie optymalnego sterowania drganiami jednostronnie zamocowanych powłok stożkowych za pomocą spiralnie ułożonego układu piezoelektrycznego czujnika skolokowanego z elementem wykonawczym (S/A). W oparciu o wyniki płynące z rozwiązania przestrzennego zagadnienia sterowania modalnego, dynamiczną odpowiedź powłoki na wymuszenie zewnętrzne wyrażono sumą postaci własnych, jednocześnie stwierdzając, że można niezależnie ingerować w poszczególne postaci własne układu. Równanie modalne przetransformowano do liniowej formuły stanu. Zaprojektowano sterowniki liniowo-kwadratowe (LQ) niezależnie dla każdej postaci własnej. Optymalną macierz współczynników wzmocnienia skorelowano z transmitancją G∗ pomiędzy napięciem sterowania i sygnału czujnika poprzez jednostkową siłę sterującą odniesioną do napięcia B2 oraz sygnału czujnika w stosunku do przemieszczenia C1. Ponieważ B2 i C1 zmieniają się wraz ze zmianą położenia skolokowanych par S/A, przeprowadzono ewaluację modalnych sił sterujących i odpowiadających im napięć dla różnych położeń układu sterowania. Wyniki badań potwierdziły efektywność optymalnego sterowania drganiami powłoki stożkowej. Zauważono także wrażliwość uzyskanego stopnia sterowania na położenie pary czujnika i elementu wykonawczego oraz wartości modalnej siły sterującej, jak i napięcia.
Źródło:
Journal of Theoretical and Applied Mechanics; 2012, 50, 3; 769-784
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
One shot profilometry using iterative two-step temporal phase-unwrapping
Autorzy:
Du, G.
Wang, M.
Zhou, C.
Si, S.
Li, H.
Lei, Z.
Li, Y.
Powiązania:
https://bibliotekanauki.pl/articles/173912.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phase unwrapping
composite fringe pattern
Fourier transform
two-step temporal phase-unwrapping
Opis:
This paper reviews two techniques that have been recently published for three-dimensional profilometry and proposes one shot profilometry using iterative two-step temporal phase-unwrapping by combining the composite fringe projection and the iterative two-step temporal phase unwrapping algorithm. In temporal phase unwrapping, many images with different frequency fringe pattern are needed to project, which would take much time. In order to solve this problem, Ochoa proposed a phase unwrapping algorithm based on phase partitions using a composite fringe. However, we found that the fringe order determined through the construction of phase partitions tended to be imprecise. Recently, we proposed an iterative two-step temporal phase unwrapping algorithm, which can achieve high sensitivity and high precision shape measurement. But it needs multiple frames of fringe images which would take much time. In order to take into account both the speed and accuracy of three-dimensional shape measurement, we get a new, and more accurate unwrapping method based on a composite fringe pattern by combining these two techniques. This method not only retains the speed advantage of Ochoa’s algorithm, but also greatly improves its measurement accuracy. Finally, the experimental evaluation is conducted to prove the validity of the proposed method.
Źródło:
Optica Applicata; 2017, 47, 1; 97-110
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular cloning, recombinant expression, and purification of osteocalcin in sika deer (Cervus nippon) antler
Autorzy:
Li, X.
Liu, M.
Bai, X.
Li, Y.
Zhao, Y.
Wang, S.
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/2087587.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cervus nippon
osteocalcin
molecular cloning
expression
purification
Źródło:
Polish Journal of Veterinary Sciences; 2019, 1; 143-150
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of energy-size reduction to the control of circulating load in vertical spindle pulverizer
Autorzy:
Li, H.
He, Y.
Zhang, Y.
Ge, Z.
Xie, W.
Wang, S.
Li, K.
Powiązania:
https://bibliotekanauki.pl/articles/110803.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
circulating load control
response of energy-size reduction
mixture grinding
energy efficiency
Opis:
In the vertical spindle pulverizer (VSP), the large circulation ratio and high ash and sulfur contents in circulating load would result in intensive energy consumption and low grinding efficiency. Although the control of circulating load would help increase the energy efficiency, no quantitative study has been conducted due to the high temperature and pressure in the closed VSP. In this study, response of energy-size reduction to the control of circulating load was studied by the experimental simulation method. Coal mixtures with fine/coarse ratio of 11:1, 8:1 and 6:1 were ground by a lab-scale roller mill. Energy-size reductions of the coarse coal were compared to evaluate the influence of circulating load control. Results showed that the product with the coarse coal increased by 30% when the specific breakage energy was 1.0 kWht–1 as the circulation ratio decreased from 11 to 6. Meanwhile, a breakage characteristic index of the coarse coal was two times higher due to the cushioning effect of fines. Besides, decrease of circulation ratio led to increase of the breakage rate of coarse coal, and the energy saving improved by 57%. With the same energy input of 2.0 kWht-1, the yield of –0.09 mm pulverized fuel (PF) increased from 22 to 43%. Therefore, controlling the circulating load is an effective method to improve the breakage rate of coarse coal and energy efficiency for PF generation.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 793-801
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New dinosaur egg material from Yunxian, Hubei Province, China resolves the classification of dendroolithid eggs
Autorzy:
Zhang, S.
Yang, T.-R.
Li, Z.
Hu, Y.
Powiązania:
https://bibliotekanauki.pl/articles/21925.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The oofamily Dendroolithidae is a distinct group of dinosaur eggs reported from China and Mongolia, which is characterized by branched eggshell units and irregular pore canals. The ootaxonomic inferences, however, were rarely discussed until now. A colonial nesting site was recently uncovered from the Qinglongshan region, Yunxian, Hubei Province, China. More than 30 dendroolithid egg clutches outcrop on the Tumiaoling Hill, including an extremely gigantic clutch containing 77 eggs. All clutches were exposed in the Upper Cretaceous fluvial-deposited Gaogou For mation. In this study, we emend the diagnosis of the oogenus Placoolithus and assign all dendroolithid eggs from the Tumiaoling Hill to a newly emended oospecies Placoolithus tumiaolingensis that shows greatly variable eggshell microstructure. Moreover, our study also disentangles the previous vexing classification of dendroolithid eggs. We conclude that Dendroolithus tumiaolingensis, D. hongzhaiziensis, and Paradendroolithus qinglongshanensis, all of which were previously reported from Yunxian, should be assigned to the newly emended oospecies Placoolithus tumiaolingensis.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health Risks From Exposure to Metal-Working Fluids in Machining and Grinding Operations
Autorzy:
Li, K.
Aghazadeh, F.
Hatipkarasulu, S.
Ray, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/90609.pdf
Data publikacji:
2003
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
machining safety
cutting fluid hazards
occupational illnesses
occupational cancer
metal working
obróbka metali
obróbka skrawaniem
ocena ryzyka zawodowego
zagrożenia zdrowia
szkodliwe czynniki fizyczne
choroba zawodowa
nowotwory
Opis:
Metal-working fluids (MWFs) are used in machining and grinding operations to cool the tool and work, reduce the friction between the tool and work, improve the surface integrity of the work piece, and increase tool life and productivity. Health problems have been reported among workers exposed to MWFs, including incidences of respiratory, digestive and skin cancers, and increased rates of cough and phlegm. This paper reviews and discusses issues concerning health risks from exposure to MWFs in machining and grinding operations, the various factors that influence the degree of exposure, and control methods to reduce exposure to metal-working fluids.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2003, 9, 1; 75-95
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A strain of pathogenic Bacillus subtilis results in brain damage in ducklings when co-infected with Riemerella anatipestifer
Autorzy:
Zhu, T.S.
Chen, F.F.
Li, J.C.
Powiązania:
https://bibliotekanauki.pl/articles/2087854.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bacillus subtilis
co-infection
Riemerella anatipestifer
duckling
opportunistic pathogen
Nauki Biologiczne i Rolnicze
Źródło:
Polish Journal of Veterinary Sciences; 2017, 4; 803-809
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observer-based leader-following formation control of uncertain multiple agents by integral sliding mode
Autorzy:
Qian, D. W.
Tong, S. W.
Li, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/201511.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-agent system
formation control
integral sliding mode control
uncertainty
nonlinear disturbance observer
stability
system wieloagentowy
kontrola formacji
integralne sterowanie ślizgowe
niepewność
nieliniowy obserwator zakłóceń
stabilność
Opis:
This paper investigates the formation control problem of multiple agents. The formation control is founded on leader-following approaches. The method of integral sliding mode control is adopted to achieve formation maneuvers of the agents based on the concept of graph theory. Since the agents are subject to uncertainties, the uncertainties also challenge the formation-control design. Under a mild assumption that the uncertainties have an unknown bound, the technique of nonlinear disturbance observer is utilized to tackle the issue. According to a given communication topology, formation stability conditions are investigated by the observer-based integral sliding mode formation control. From the perspective of Lyapunov, not only is the formation stability guaranteed, but the desired formation of the agents is also realized. Finally, some simulation results are presented to show the feasibility and validity of the proposed control scheme through a multi-agent platform.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 1; 35-44
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Surface Profile and Surface Roughness of Fibre-Optic Interconnect by Fast Fourier Transform
Autorzy:
Lin, C. S.
Yang, S. W.
Lin, H. L.
Li, J. W.
Powiązania:
https://bibliotekanauki.pl/articles/221117.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface profile
surface roughness
fibre end-face
fast Fourier transform
Opis:
This study proposes a surface profile and roughness measurement system for a fibre-optic interconnect based on optical interferometry. On the principle of Fizeau interferometer, an interference fringe is formed on the fibre end-face of the fibre-optic interconnect, and the fringe pattern is analysed using the Fast Fourier transform method to reconstruct the surface profile. However, as the obtained surface profile contains some amount of tilt, a rule for estimating this tilt value is developed in this paper. The actual fibre end-face surface profile is obtained by subtracting the estimated tilt amount from the surface profile, as calculated by the Fast Fourier transform method, and the corresponding surface roughness can be determined. The proposed system is characterized by non-contact measurement, and the sample is not coated with a reflector during measurement. According to the experimental results, the difference between the roughness measurement result of an Atomic Force Microscope (AFM) and the measurement result of this system is less than 3 nm.
Źródło:
Metrology and Measurement Systems; 2017, 24, 2; 381-390
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon Footprint of Production Processes of Polypropylene Nonwoven Shopping Bags
Poziom emisji związków węgla przy produkcji toreb na zakupy wykonanych z włókniny polipropylenowej
Autorzy:
Muthu, S. S.
Li, Y.
Hu, J. Y.
Mok, P. Y.
Liao, X.
Powiązania:
https://bibliotekanauki.pl/articles/233883.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
poziom emisji związków węgla
produkcja toreb na zakupy
włóknina polipropylenowa
szycie
zgrzewanie
SimaPro
sewing technology
thermal attachment
global warming potential
life cycle impact assessment (LCIA)
Opis:
This article reports on the carbon footprint of production processes of polypropylene nonwoven shopping bags made out of two different manufacturing technologies (Products A and B, made by the conventional sewing and thermal joining methods) assessed from their cradle to the gate stage using the Life Cycle Assessment (LCA) technique. This study was performed based on the comprehensive Life Cycle Inventory (LCI) of two different manufacturing sequences obtained from a detailed in-field study of the nonwoven PP bag manufacturing industry. The environmental impacts were quantified by means of the IPCC 2007 GWP V 1.1. method in SIMAPRO 7.2. The carbon footprint expressed in terms of the global warming potential (kg CO2 values for 20 and 100 years), calculated by IPCC 2007 methods, was considered as a directive to compare the environmental impact of these bags, manufactured by the two different technologies, and a detailed explanation of the results is provided in this paper. From the results of carbon footprint modelling, product A, made by conventional sewing technology, was found to be better than product B, made by thermal technology. A detailed explanation of the results of the environmental performance of these bags as well as the hot-spots in both production technologies are discussed to a greater extent in this article.
Artykuł dotyczy poziomu emisji związków węgla przy produkcji toreb na zakupy wykonanych z włókniny polipropylenowej przy zastosowaniu dwóch różnych technologii (konwencjonalne szycie i zgrzewanie termiczne) ocenionego techniką LCA - środowiskowej oceny analizy cyklu życia produktu. Badania przeprowadzono w oparciu o wyczerpującą analizę zbioru danych cyklu życia (LCI) dwóch różnych procedur produkcyjnych opartych na zebraniu danych od producentów toreb. Ilościowa ocena wpływu środowiska została wyliczona stosując metodę IPCC 2007 GWP V 1.1. Emisja związków węgla w kategoriach potencjału tworzenia efektu cieplarnianego (wartość kgCO2 podana dla 20 i 100 lat) zastała uznana za istotny czynnik dla oceny wpływu analizowanych procesów produkcyjnych na środowisko. Stwierdzono, że z punktu widzenia emisji korzystniejszy jest tradycyjny sposób produkcji - zszywanie, w porównaniu do zgrzewania.
Źródło:
Fibres & Textiles in Eastern Europe; 2012, 3 (92); 12-15
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surfactant assisted removal of engine oil from synthetic soil
Autorzy:
Ramamurthy, A. S.
Chen, Z.
Li, X.
Azmal, M.
Powiązania:
https://bibliotekanauki.pl/articles/207953.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sodium dodecyl sulfate
SDS
desorption
polyethylene oxides
sodium
sodium sulfate
soils
surface active agents
dodecylosiarczan sodu
surfaktanty anionowe
desorpcja
tlenki polietylenu
sód
siarczan sodowy
gleba
środki powierzchniowo czynne
detergenty
Opis:
Effectiveness of surfactants SDS (sodium dodecyl sulfate), AOT (sodium dioctyl sulfosuccinate) and Brij 35 (polyoxyethylene lauryl ether) in removing residual oil from soils have been determined. Experimental results indicated that oil desorption efficiencies with surfactants are 7 to 18 times higher than using water alone. 0.6% Brij 35 at was the most effective surfactant to remove oil from soil, and it did not display any significant change in oil desorption with pH changes. A comparison study also showed that pore volume was a more significant parameter than soil washing flow rate to improve oil desorption.
Źródło:
Environment Protection Engineering; 2015, 41, 2; 67-79
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic stability of a stepped drillstring conveying drilling fluid
Autorzy:
Zhao, G.-H.
Tang, S.
Liang, Z.
Li, J.
Powiązania:
https://bibliotekanauki.pl/articles/280899.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
drill string
stepped fluid-conveying pipe
complex frequency
stability
FEM
Opis:
Taking into account differences between a drill pipe (DP) and a drill collar (DC), the drillstring in a vertical well is modeled as a stepped pipe conveying a drilling fluid downwards to the bottom inside the string and then upwards to the ground from the annulus. An analytical model that describes lateral vibration of the drillstring and involves the drillstring gravity, weight on bit (WOB), hydrodynamic force and damping force of the drilling fluid is established. By analysis of complex frequencies, the influences of WOB, borehole diameter, DP length, velocity and density of the drilling fluid on the stability of the system are discussed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1409-1422
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of operating pressure and stand-off distance on coal comminution by waterjet
Autorzy:
Li, Y.
Galecki, G.
Şen, G. A.
Şen, S.
Powiązania:
https://bibliotekanauki.pl/articles/110840.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal
waterjet
comminution
particle size distribution
Opis:
Comminution of coal to ultrafine sizes by high-pressure waterjet coupled with cavitation cell provides a novel method for preparation of coal-water fuels for next generation, near-zero emission electric power generation. To establish the fundamental performance of the waterjet mill, the effects of the operating pressure and stand-off distance were comprehensively investigated using a high ash bituminous coal. The comminution products were evaluated in terms of the particle size, particle size distribution, and surface area change. The experimental results indicated that the waterjet-mediated comminution of coal was strongly affected by all these operating parameters. Higher operating pressure led to finer products, while the efficiency of the waterjet mill in terms of particle size strongly depended on the stand-off distance. This research provides a deeper insight into the high-pressure waterjet for coal comminution and a basis for process parameter optimization.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 394-401
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the Effect of the Opening Unit on the Airflow Field in Rotor Spinning
Badanie wpływu jednostki otwierającej na pole przepływu powietrza w przędzeniu rotorowym
Autorzy:
Jin, Y.
Zhu, S.
Cui, J.
Li, J.
Zhu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/233833.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
rotor spinning
opening unit
flow characteristics
trash removal
fibre opening
Discrete Phase Model
DPM
przędzarka rotorowa
jednostka otwierająca
charakterystyka przepływu
usuwanie odpadów
model dyskretny fazy
Opis:
The opening unit is an important device in a rotor spinning unit to comb fibres and remove trash. In this paper, numerical simulation is carried out to study the flow structure in the rotor spinning channel and the trash removal process in the trash removal unit. Firstly the effect of the opening unit on the airflow field in the rotor channel is investigated by singlephase simulation. The result shows that the effective area for fibre conveyance enlarges as the absolute value of negative pressure at the outlet increases, while it decreases as the opening roller speed increases. However, the effect of the negative pressure and the opening roller speed on the length of the vortex in the axial direction is quite small. Secondly the trash separation process in the trash removal unit is simulated using the Discrete Phase Model (DPM). Suitable rotational speeds of particles of different diameters are acquired. These results could provide a valuable reference for parameter selection in the trash-removal process.
Jednostka otwierająca jest ważnym urządzeniem w przędzarce rotorowej służącym do rozczesywania włókien i usuwania odpadów. W artykule przeprowadzono symulację numeryczną mającą na celu zbadanie struktury przepływu w kanale przędzalniczym wirnika oraz procesu usuwania odpadów. Wpływ jednostki otwierającej na pole przepływu powietrza w kanale wirnika badano symulacją jednofazową. Wyniki wykazały, że efektywny obszar transportu włókien powiększa się, gdy wartość bezwzględnej wartości ujemnego ciśnienia na wylocie wzrasta, a zmniejsza się wraz ze wzrostem prędkości wału otwierającego. Jednakże wpływ podciśnienia i prędkość wału otwierającego na długość wiru w kierunku osiowym jest stosunkowo niewielka. Stwierdzono także, że proces separacji odpadów w jednostce usuwania odpadów jest symulowany przy użyciu modelu dyskretnego fazy (DPM). Otrzymuje się odpowiednie prędkości obrotowe cząstek o różnych średnicach. Wyniki te mogą stanowić cenny punkt odniesienia dla wyboru parametrów w procesie usuwania odpadów.
Źródło:
Fibres & Textiles in Eastern Europe; 2017, 5 (125); 18-24
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and mathematical investigations on unconfined compressive behaviour of costal soft soil under complicated freezing processes
Autorzy:
Wang, W.
Li, N.
Zhang, F.
Zhou, A.
Chi, S.
Powiązania:
https://bibliotekanauki.pl/articles/259246.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
costal soft soil
stress-strain curve model
unconfined compressive behavior
freezing-thawing circle
Opis:
In order to properly understand the effect of freezing-thawing circle (FTC) to mechanical behavior of costal soft soil (CSS), unconfined compressive test is conducted. Six kind FTC times are designed from zero to five. The tested data show that: (1) unconfined compressive strength of CCS decreases nonlinearly with more FTC, and the strength after five FTC times becomes about 22% of its original strength without any freezing-thawing experience; (2) stressstrain curves of all unconfined compressive samples can be well fitted by three-parameter hyperbolic model; (3) and relationship between two parameters and FTC times can be fitted by exponent function, while another parameter can be considered as 0.95. Consequently, one composite hyperbolic- exponent empirical formula is established in order to describe freezing-thawing-dependent stress-strain behavior of CSS. Finally, good agreements have been found between tested dada and simulated results.
Źródło:
Polish Maritime Research; 2016, 4; 112-116
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three Insensitive Energetic Co-crystals of 1-Nitronaphthalene, with 2,4,6-Trinitrotoluene (TNT), 2,4,6-Trinitrophenol (Picric Acid) and D-Mannitol Hexanitrate (MHN)
Autorzy:
Hong, D.
Li, Y.
Zhu, S.
Zhang, L.
Pang, C.
Powiązania:
https://bibliotekanauki.pl/articles/1063066.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
co-crystal
insensitive energetic material
crystal structure
explosive properties
Opis:
Co-crystallization is proposed as an effective method to alter the physicochemical properties of energetic materials, e.g. density, sensitivity and solubility. As reported in this paper, it was found that 1-nitronaphthalene could form cocrystals with TNT, picric acid and MHN in a 1:1 molecular ratio. The sensitivity and thermal stability of the 1-nitronaphthalene co-crystals was greatly improved compared with that of pure TNT, picric acid and MHN. In addition, the melting points of TNT, picric acid and MHN were lowered through co-crystallization with 1-nitronaphthalene. The electrostatic potential surface of 1-nitronaphthalene, calculated by the DFT method, showed that the electron-rich 1-nitronaphthalene has a tendency to be a proton donor and to co-crystallize with other energetic materials. The structures of the co-crystals of 1-nitronaphthalene with TNT and picric acid were characterized by single crystal X-ray diffraction (SXRD). The 1-nitronaphthalene/MHN co-crystal was studied by powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC) and FTIR.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 1; 47-62
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 184

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies