Wyniki wyszukiwania - Biblioteka Nauki

1

Approximate Study on a Tensile Model of Wool/spandex Core - spun Yarn

100%

Dang M. , Wang S.

Fibres & Textiles in Eastern Europe

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2007

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tom Vol. 15, no. 4 (63)

59--62

EN

An approximate approach is presented to calculate and predict the specific stress of wool/spandex core-spun yarn, based on an idealised yarn structure model and Hearle’s yarn theory. The approximate model covers some major parameters from wool fiber, spandex and core-spun yarn. Comparing with experimental tensile (stress-strain) curves of core-spun yarn, we can see that the theoretical model can basically reflect the shape of wool/spandex core-spun yarn’s tensile curve and the model is useful for predicting the stress-strain behaviour of wool/spandex core-spun yarn at small extension.

PL

Przedstawiono próbę obliczania i przewidywania wytrzymałości właściwej przędz rdzeniowych wełna-elastomer. Metoda oparta jest na modelu unikalnej struktury włókna i teorii włókna Heorlego. W modelu uwzględniono podstawowe parametry przędzy wełnianej, elastomerowej i połączonej przędzy rdzeniowej. Porównując wyniki obliczeń z krzywymi eksperymentalnymi przędz rdzeniowych, widzimy że model teoretyczny może odzwierciedlać kształt krzywej siła-wydłużenie i musi służyć do przewidywania właściwości wytrzymałościowo-sprężystych przędz rdzeniowych wełna-elastomer przy małych wydłużeniach.

2

Solid lubricated bearings performance degradation assessment: A fuzzy self-organizing map method

100%

Zhang C. , Wang S.

Eksploatacja i Niezawodność

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2013

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tom Vol. 15, no. 4

397--402

EN

Solid lubricated bearings are common components in space mechanisms, and their reliability and performance degradation assessment are very crucial. In this study, a fuzzy self-organizing map method is used to perform performance degradation assessment. Feature vectors are constructed by indices of vibration as well as friction torque signal. Self-organizing map is then used to perform performance degradation assessment and the subjection of each feature vector to normal cluster on output layer is used as degradation indicator. Accelerated life test results show that this method can make effective performance degradation assessment and describe degradation degree in the whole life time.

PL

Łożyska ze smarem stałym to powszechnie stosowane elementy urządzeń, a ich niezawodność i ocena degradacji charakterystyk są bardzo istotne. W przedstawionej pracy wykorzystano metodę rozmytych samoorganizujących się map do oceny obniżenia charakterystyk. Wektory cech skonstruowano za pomocą wskaźników wibracji, jak również sygnału momentu tarcia. Następnie dokonano oceny obniżenia charakterystyk z wykorzystaniem samoorganizującej się mapy, a za wskaźnik degradacji przyjęto przynależność każdego wektora cech do normalnej grupy w warstwie wyjściowej. Wyniki badań przyspieszonych pokazują, że przy użyciu omawianej metody można dokonywać skutecznej oceny obniżenia charakterystyk a także opisywać stopień degradacji w całym okresie eksploatacji.

3

Robust trajectory tracking control of underactuated surface vehicles with prescribed performance

100%

Wang S. , Tuo Y.

Polish Maritime Research

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2020

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tom 27

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nr 4

4

Evaluation of space-time pattern on haze polluttion and associated health losses in the Yangtze River Delta of China

100%

Zhao H. , Wang S.

Polish Journal of Environmental Studies

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2017

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tom 26

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nr 4

EN

Haze has become an important topic for discussion in relation to global atmospheric pollution prevention and control due to its environmental and health effects. In order to explore the change in the space-time pattern of haze in the Yangtze River Delta of China and the associated human health losses, this paper uses MODIS Level 2 aerosol products of 2000-14 as well as applying the Kriging interpolation method to analyze the characteristics of changes of aerosol optical depth (AOD). The human capital method is then applied to evaluate the health losses caused by haze pollution in 2004-13. The research proves that in the latest 15 years, the AOD in the Yangtze River Delta has fluctuately risen from 0.5645 in 2000 to 0.5841 in 2014, with the spatial distribution pattern higher in the north and lower in the south. The northern cities of Shanghai, the southern part of Jiangsu Province, and the Hangzhou Bay region have always registered highest values. This analysis also shows that elevated concentration has gradually spread toward the southern areas. Meanwhile, the health losses in the whole region and each city have tended to be aggravated; the health losses in southern cities are far lower than those in northern cities. For example, the southern cities of Zhoushan and Taizhou see the lowest health losses ($0.039 billion and $0.035 billion, respectively). Conversely, the highest health losses are located in the northern cities of Shanghai, at $13.60 billion. However, the growth rate of health losses in southern cities is obviously higher than that in northern cities as a result of pollution transfer at the average rates of 249.18% and 99.94%.

5

Effect of engine speeds and dimethyl ether on methyl decanoate HCCI combustion and emission characteristics based on low-speed two-stroke diesel engine

100%

Wang S. , Yao L.

Polish Maritime Research

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2020

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tom 27

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nr 2

6

Effect of surfactants on the flotation performance of low-rank coal by particle sliding process measurements

100%

Wang S. , Tao X.

Gospodarka Surowcami Mineralnymi

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2018

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tom T. 34, z. 1

69--82

EN

In this paper, flotation performances of low-rank coal were investigated in the 2-ethyl hexanol, DAH (dodecyl amine hydrochloride), and SDS (sodium dodecyl sulfate) solutions, respectively. In order to reduce the heterogeneity and hydrodynamic effects on the hydrophobicity and movement trajectory of low-rank coal particles, respectively, experimental coal samples with low ash content and 0.500–0.250 mm in size fraction were adopted. The XPS result demonstrated that the total silicium and aluminum content of 0.500–0.250 mm size fraction was 1.58%. It was also found that the ash content of the 0.500–0.250 mm size fraction was 1.91%. Therefore, it demonstrated that there were few hydrophilic mineral particles on the coal sample surface. Thus, the heterogeneity effect of hydrophilic mineral particles during sliding process measurements can be ignored. The XPS result also indicated that after the grinding process, the mineral content on the low-rank coal surface was very small, which would play a small role in the hydrophobicity of low-rank coal samples. The flotation results indicated that the hydrophobicity of the low-rank coal particles could be improved by nonionic 2-ethyl hexanol and cation DAH surfactants. Moreover, from the analysis of slip angle velocity, it demonstrated that the flotation responses of low-rank coal were depressed by anionic SDS. Furthermore, it was observed that the slip angle velocity can be used to evaluate the effect of surfactant agents on the flotation performance of low-rank coal while the surfactant concentration was more than 10–6 mol/L.

PL

W niniejszym artykule zbadano właściwości flotacyjne węgla niskiej jakości w roztworach 2-etyloheksanolu, DAH (chlorowodorku dodecylu) i SDS (dodecylosiarczanu sodu). W celu zmniejszenia niejednorodności i skutków hydrodynamicznych hydrofobowości i trajektorii ruchu cząstek węgla niskiej jakości przyjęto do doświadczeń próbki węgla o niskiej zawartości popiołu z klasy ziarnowej 0,500–0,250 mm. Wynik XPS wykazał, że całkowita zawartość krzemu i glinu w klasie ziarnowej 0,500–0,250 mm wynosiła 1,58%. Stwierdzono również, że zawartość popiołu w klasie ziarnowej 0,500–0,250 mm wynosiła 1,91%. W związku z tym wykazano, że na powierzchni próbki węgla znajduje się niewiele hydrofilowych cząstek mineralnych. W ten sposób można pominąć efekt heterogeniczności hydrofilowych cząstek mineralnych podczas pomiarów kąta poślizgu. Wynik XPS wskazał również, że po procesie mielenia zawartość minerałów na powierzchni węgla niskiej jakości była bardzo mała, dlatego też występuje słabe oddziaływanie na hydrofobowość tych próbek. Wyniki flotacji wskazują, że hydrofobowość cząstek węgla niskiej jakości można poprawić za pomocą niejonowego 2-etyloheksanolu i kationowych środków powierzchniowo czynnych DAH. Analiza prędkości kąta poślizgu wykazuje, że flotacja węgla niskiej jakości została obniżona przez SDS. Ponadto zaobserwowano, że prędkość kąta poślizgu może być wykorzystana do oceny wpływu środków powierzchniowo czynnych na sprawność flotacji węgla niskiej jakości, gdy ich stężenie jest większe niż 10–6 mol/L.

7

Application of longdistance pipeline transportation in metallurgical industry of China

100%

Huang J. , Wang S.

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Melioracja

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1988

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nr 31

8

State Observer based Adaptive Fuzzy Backstepping Compensation Control of Passive Torque Simulator

100%

Ullah N. , Wang S.

Przegląd Elektrotechniczny

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2013

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tom R. 89, nr 2a

160--165

EN

Passive Torque Simulator (PTS) is an important ground based hardware tester simulator used for qualification of flight actuation system under aerodynamics torque loading .In this work extra torque disturbance due to actuator motion under test is analyzed and fuzzy Backstepping control with online parameters tuning scheme is proposed. Since extra torque affects both transient and steady state performance of the control loop, high gain adaptive control is investigated to improve the transient response of PTS torque tracking. Finally fuzzy Back stepping control with online parameters tuning scheme is proposed to improve torque tracking performance of load simulator both in transient and steady state. Simulations results show the validity of proposed control.

PL

W artykule przedstawiono analizę wpływu ruchu siłownika w czasie testu, na zakłócenia pomiaru momentu obciążenia na potrzeby symulatora obciążenia aerodynamicznego w systemie siłowników (ang. Passive Torque Simulator). W algorytmie wykorzystano sterowanie oparte na logice rozmytej z krokiem wstecz i parametrami dobieranymi online.

9

The technology of preparing green coating by conducting micro-arc oxidation on AZ91D magnesium alloy

100%

Wang S. , Liu P.

Polish Journal of Chemical Technology

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2016

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tom Vol. 18, nr 4

36--40

EN

Micro-arc oxidation was applied to AZ91D magnesium alloy by taking K2Cr2O7 as the colouring salt in the silicate system. It was shown that the green coating obtained through performing micro-arc oxidation on magnesium alloy consisted of Mg, Mg2SiO4 , MgO, and Mg2SiO4 based on analysis of X-ray diffraction (XRD), and scanning electron microscopy (SEM). Among which, Mg2SiO4 was the colouring salt; there were something in the lamellar, pit, and convex forms found on the surface of the coating. The coating consisted of a porous, and a compact, layer from the outside to the inside. As demonstrated, the colour of the coating depended on the K2Cr2O7 concentration: it became gradually deeper with the addition of K2Cr2O7 and the increasing micro-arc oxidation time. The corrosion resistance and hardness of the green coating were greater than that of the matrix.

10

Poprawianie odpornosci na wode klejow mocznikowo-formaldehydowych do produkcji sklejki za pomoca koreakcji z uzyciem protein

100%

Wang S. , Pizzi A.

Biuletyn Informacyjny Ośrodka Badawczo-Rozwojowego Przemysłu Płyt Drewnopochodnych w Czarnej Wodzie

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1998

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tom 39

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nr 4

317-318

11

Soil organic carbon density spatial distribution and influencing factors in a karst mountainous basin

80%

Zhang Z. , Zhou Y. , Wang S. , Huang X.

Polish Journal of Environmental Studies

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2017

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tom 26

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nr 5

EN

To illustrate the distribution pattern of soil organic carbon density (SOCD) in a small karst watershed and its main influencing factors, this research quantitatively analyzed the spatial heterogeneity and distribution characteristics of SOCD using 2,755 thoroughly investigated soil profile samples; field point sampling, laboratory determination, and geo-statistical analysis were used, and the major influencing factors of SOCD were analyzed using a principal components analysis. The results indicated that the SOCD decreased gradually with increasing soil depth in the small karst watershed; in particular, the average SOCD was equal to 12.11 kg·m⁻² at a depth of 100 cm, which is higher than the national level. An optimal fitting model for the SOCD in this Basin was a Gaussian model, which showed a moderately strong spatial correlation. A kriging interpolation suggested that the soil carbon density (SOCD) was higher in the eastern region but lower in the southern region, exhibiting an ascending trend from the middle to the exterior. In the small karst watershed, the SOCD at a depth of 100 cm differs between different vegetation types, different soil utilization types, and different soil types. The soil thickness, rock coverage and altitude were the principal influencing factors on the SOCD in the small karst watershed, among which soil thickness had the largest impact.

12

A multi-layered potential field method for water-jet propelled unmanned surface vehicle local path planning with minimum energy consumption

80%

Wang S. , Fu M. , Wang Y. , Zhao L.

Polish Maritime Research

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2019

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tom 26

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nr 1

EN

Focusing on the influence of wind and surface currents on local path planning in the marine environment, a multi-layered potential field (MPF) method is proposed to minimize the energy consumption of a water-jet propelled unmanned surface vehicle (USV). A synthetic environment framework that can incorporate the information of the base potential field layer and the environment layer is constructed first. This framework provides a base for minimizing the energy consumption of the water-jet propelled USV through proper force weighting. For the purpose of USV path planning, the traditional potential field method is extended by including the velocity information of the USV and the approached obstacles to avoid collisions with dynamic obstacles. The proposed method integrates kinematic control to prevent considering the vehicle as a point mass or rigid body. Finally, simulation and comparison experiments are performed to demonstrate the energy-saving efficiency of the proposed local path planning approach for the water-jet propelled USV

13

Numerical investigation of temperature distribution of thermal discharge in a river-type reservoir

80%

Wang S. , Chen F. , Zhang W.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 5

EN

A 3-D thermal discharge numerical model based on the Navier-Stokes equation, the k–ε turbulence model, and the temperature diffusion-controlled equation was developed to simulate the 3-D distribution of thermal discharge along a river-type reservoir under different discharge conditions, hydrological conditions and reservoir water levels. Results showed that the thermal discharge from the power plant would have a smaller effect on a deep-water reservoir. Neither 1ºC, 2ºC nor 3ºC isotherm appear in any scenario conditions. For dam water depths of 155 m and 175 m, a small envelope area of 0.05ºC isothermal line was predicted. The isothermal lines of 0.05ºC and 0.1ºC covered a small area in all scenario conditions. The temperature increase 500 m downstream of the discharge point was predicted to be less than 0.05ºC during dry seasons. The predicted stability time of the temperature increase in each layer was 20 days. It evidences the thermal impact intensity and the extent is different under three scenario conditions. The predicted space–time distribution of the cooling water and the temperature increase provide scientific bases for designing water intake and water management. In the future, the influence of thermal discharge on water quality and aquatic organisms of the reservoir will be discussed based on the simulation results of this study, that is, the variation law of water temperature caused by thermal discharge.

14

On the Critical Strip of the Riemann zeta Fractional Derivative

80%

Cattani C. , Guariglia E. , Wang S.

Fundamenta Informaticae

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2017

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tom Vol. 151, nr 1/4

459--472

EN

The α-order fractional derivative of the Dirichlet η function is computed in order to investigate the behavior of the fractional derivative of the Riemann zeta function ζ(α) on the critical strip. The convergence of η(α) is studied. In particular, its half-plane of convergence gives the possibility to better understand the ζ(α) and its critical strip. As an application, two signal processing networks, corresponding to η(α) and to its Fourier transform respectively, are shortly described.

15

Comparison and analysis of rotor-spun composite yarn and sirofil yarn

80%

Yang R.-H. , Xue Y. , Wang S.

Fibres & Textiles in Eastern Europe

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2010

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tom Vol. 18, no. 1 (78)

28--30

EN

As a result of various spinning types, different kinds of yarns have different structures and performances. In this research we developed a composite yarn spinning system that produces different kinds of composite yarns containing filament on a modified rotor spinning frame. Rotor-spun composite yarn and sirofil were produced by a modified rotor spinning machine and a modified ring spinning machine, respectively. Their longitudinal views, abrasion resistance, hairiness and breaking strength were tested and analyzed. The conclusion obtained was that, compared with sirofil, rotor-spun composite yarn has a smoother surface, less hairiness, higher abrasion resistance, lower breaking strength and better evenness.

PL

W wyniku stosowania różnych metod przędzenia otrzymuje się przędze zróżnicowane pod względem struktury, parametrów technicznych i jakości. W wyniku badań opracowano system przędzenia przędz kompozytowych na zmodernizowanej przędzarce, na której wyprodukowano rotorowe przędze kompozytowe i przędze typu sirofil. Testowano i analizowano następujące parametry wytworzonych przędz, zewnętrzny wygląd przędz, włochatość, wytrzymałość na ścieranie i wytrzymałość na zrywanie. W wyniku badań stwierdzono, że kompozytowe przędze rotorowe w porównaniu do przędz sirofil charakteryzują się gładszą powierzchnią, mniejszą włochatością, większą wytrzymałością na ścieranie, mniejszą wytrzymałością na zrywanie i lepszą równomiernością.

16

Research of lateral force of pipe conveyor belt’s vertical transport section

80%

Wang S. , Guo Y.-C. , Li D. Y. , Hu K.

Archives of Transport

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2016

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tom Vol. 37, iss. 1

67--75

EN

In order to release the lateral force of pipe conveyor belt in vertical transportation, the thesis had a study of the lateral force of the conveyor belt. By making use of Janssen Principles and fractal theory, based on reasonable simplification, the author established a mathematical model of the lateral force in vertical transportation, and with the research foundation of the pipe belt conveyor for underground transportation, through solution analysis, the author found out that the change of material diameter would lead to nonlinear variation of the lateral force of the conveyor belt. Under the circumstances of different material diameter, discrete element method was adopted to simulate the lateral force of the conveyor belt, thus working out the distribution curve chart of the lateral force. To verify the reliability of the theory, the author built an experimental platform for pipe conveyor belt in vertical transportation, and experimented with five groups of materials in different diameter, working out the strain of lateral force of the characteristic conveyor belt; by comparing the theoretical result, the simulation result and the experimental result, it showed that the solution to relieving lateral force through optimization selection of material diameter put forward in this thesis was reasonable and effective. It provides theoretical reference for the design of pipe belt conveyor.

17

The environment and the utilization the status of the subsidence area in the Xu Zhou, Yan Zhou and Huainan and Huaibei region of China

80%

Fan T. G. , Yan J. P. , Wang S. , Ruan S. X.

AGH Journal of Mining and Geoengineering

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2012

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tom Vol. 36, no. 3

127-133

EN

The main coal mining subsidence area of the Xu Zhou, Yan Zhou, Huaihe collapsed state region were investigated including the environment state, water surface area, pollution source, and the utilization state. Some advice wasproposed to protect the environment of the subsidence area.

PL

Badaniem objęto główną strefę osiadania w stanie całkowitego zawału w chińskich regionach Xu Zhou, Yan Zhou i Huaihe, w tym stan otoczenia, wody powierzchniowe, źródła zanieczyszczenia oraz utylizację. Zaproponowano kilka rozwiązań dla ochrony środowiska strefy osiadania.

18

Development Processes and Property Measurements of Moisture Absorption and Quick Dry Fabrics

80%

Wang F. , Zhou X. , Wang S.

Fibres & Textiles in Eastern Europe

|

2009

|

tom Vol. 17, no. 2 (73)

46--49

EN

In this study, a new type of honeycomb-patterned micro-porous polyester fibre was used to develop good moisture absorption and quick drying properties of woven fabrics. Details of the development and after-finish processes of the fabrics were illustrated. The water transport, vapour transmission and quick dry properties of the seven different end products were also investigated. It was evident that weaving parameters and after-finish processes are crucial factors in the fabric production process. The final products can also have good water transport and quick dry properties without additive treatment.

PL

Nowy rodzaj mikroporowatych włókien poliestrowych o strukturze plastra miodu został użyty do opracowania tkanin wykazujących dobrą absorpcję wilgoci i szybkoschnących. Przedstawiono szczegółowo opracowanie tych tkanin oraz procesy wykańczalnicze. Dla siedmiu wyprodukowanych tkanin określono transport wody, przepuszczalność pary wodnej oraz szybkość schnięcia. Wykazano jednoznacznie że parametry procesu tkania i wykańczania tkanin są decydującymi właściwościami dla otrzymania odpowiednich parametrów tkanin. stwierdzono również, że produkty finalne mogą wykazywać dobry transport wody i szybkie schnięcie bez dodatkowej obróbki.

19

Experimental research on energy release characteristics of water-bearing sandstone alongshore wharf

80%

Wang S. , Zhao Y. , Zou Z. , Jia H.

Polish Maritime Research

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2017

|

tom S 2

147--153

EN

It is important to evaluate the deformation and failure of sandstone in the foundation engineering of coast, river bank and lake shore. While the deformation and failure of sandstone is a comprehensive result of energy release and dissipation, and energy release is the internal reason which leads to global failure of the sandstone. The experimental analysis is conducted on the character of energy revolution of the sandstone specimen by rating loading and unloading, and the catastrophe model is followed in analyzing elastic strain energy accumulation and release in rock deformation and failure. The index based on elastic energy release is proposed to assess the rock brittleness. It is found that increasing water content is to relieve energy release and catastrophe failure of the rock specimen, and weakening the capacity of elastic energy storage. The peak and residual values of elastic energy are raised as the confining pressure increases, and the post-peak released energy decreases progressively. The confining pressure strengthens energy storage and inhibits energy release of the rock specimen, and saturation of rock will weaken this inhibit effect. The brittleness index decreases with increasing confining pressure as the rock specimen transforming from brittle to ductile.

20

Study on the interactions between nitidine chloride and nucleic acids and its applications

80%

Qin W. , Wang S. , Liu Z. , Gong G.

Chemia Analityczna

|

2003

|

tom Vol. 48, No. 2

189-201

EN

A fluorescence method for the quantitative determination of nucleic acids has been proposed, which utilizes the enhancement of the fluorescence intensity of the nitidine chloride (NC) in the presence nucleic acids in aqueous solutions. Strong hypochromism, red shifts and isosbestic points (260 nm) in the absorption spectra were observed when NC binds to the calf thymus DNA (ctDNA), which suggested the intercalation mechanism of NC binding to DNA bases. Iodide quenching studies showed that the magnitude of AT of the free NC was higher than that of the bound NC. Thermal denaturation experiments revealed that the increase of the NC fluorescence in the presence of single strand (dsDNA) was smaller than in the presence of double strand (dsDNA). NC binding mode was also investigated with Scatchard plots. The results have also proved the intercalation of NC among DNA bases. The maximum fluorescence was observed within the pH range: 6.8-9.2, at the maximum excitation and emission wavelengths of 395 and 510 nm, respectively. Under optimum conditions, the measured fluorescence intensity in the presence of nucleic acids was proportional to the nucleic acids concentration over the range of 0.10-4.0 ug ml(-1) for ctDNA, 0.20-4.0 ug ml(-1) for thermally denatured ctDNA and 0.25-4.0 ug mL(-1) for yeast RNA. The corresponding detection limits were 39 ng ml/1 for ctDNA, 71 ng mL(-1) for thermally denatured ctDNA and 83 ng mL(-1) for for yRNA. The method has been successfully applied to the determination of DNA in real honey samples.

PL

Zaproponowano metodę ilościowego oznaczania kwasów nukleinowych opartą na wykorzystaniu wzmocnienia fluorescencji chlorku nitydyny (NC) w roztworach wodnych pod wpływem kwasów nukleinowych. W trakcie wiązania się NC z DNA grasicy cielęcej (ctDNA) obserwowano w widmach absorpcyjnych efekty hipochromowy i batochromowy oraz punkt izozbestyczny (260 nm) co sugerowało mechanizm wtrącenia NC do zasad DNA. Badania wygaszania fluorescencji pod wpływem jodków wykazały, że wartość AT wolnego NC była wyższa niż analogiczna wartość związanego NC. Badania nad denaturacją termiczną wykazały, że DNA w postaci pojedynczej nici (ssDNA) słabiej wzmacnia fluorescencję NC niż DNA o podwójnej nici (dsDNA). Przedyskutowano także badania sposobu wiązaniaNC za pomocą wykresów Scatcharda. Wszystkie te badania także wskazują, że NC zostaje wtrącony w stos zasad DNA. Maksymalna fluorescencja występowała w zakresie pH 6.8-9.2 odpowiednio: 395 nm i 510 nm. W optymalnych warunkach różnicowa wartość natężenia fluorescencji w nieobecności i obecności kwasów nukleinowych była proporcjonalna do stężenia tych kwasów w zakresie 0.10-4.0 ug ml(-1) dla ctDNA, 0.2-4.0 dla termicznie zdenaturowanego ctDNA oraz 0.25-4.0 ug mL(-1) dla RNA z drożdży. Granice detekcji wynosiły odpowiednio: 39 ng mL(-1) dla ctDNA, 71 ng ml(-1) dla termicznie zdenaturowanego ctDNA i 83 ng mL(-1) dla yRNA. Metodę zastosowano z powodzeniem do oznaczania DNA w rzeczywistych próbkach miodu.