Wyniki wyszukiwania - BazTech

1

Crystallization and melting behavior of poly(L-lactic acid) modified with salicyloyl hydrazide derivative

Cai Y.-H., Tian L., Tang Y.

Polimery

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2017

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T. 62, nr 10

734--742

EN

This work evaluated the influence of a novel organic nucleating agent, salicyloyl hydrazide derivative (BS), on the crystallization and melting behavior of poly(L-lactic acid) (PLLA). Differential scanning calorimetry revealed that the incorporation of BS (0.2 to 3 wt %) significantly promoted the crystallization of PLLA on cooling at 1 °C/min. At BS content of 1.5 wt % in PLLA matrix, the highest effectiveness of crystallization process was observed, this result was further demonstrated by X-ray diffraction analysis of non-isothermal crystallization behavior at different cooling rate and measurements after isothermal crystallization. X-ray diffraction studies showed also that the addition of BS did not change the crystalline structure of PLLA. Based on the effect of the predetermined melting temperature on the crystallization behavior of PLLA/BS, the optimum process temperature of 190 °C was found. The comparative study on the melting behavior of PLLA/BS composite under different conditions (cooling rate, melting temperature) also confirmed the ability of BS to promote the nucleation of PLLA crystallization. The crystallization of PLLA/BS composite depends on the concentration of BS additive, crystallization temperature and time as well as heating rate.

PL

Badano wpływ nowego organicznego czynnika nukleującego, salicyloilowej pochodnej hydrazydu (BS), na krystalizację i topnienie poli(kwasu L-mlekowego) (PLLA). Na podstawie badań metodą różnicowej kalorymetrii skaningowej stwierdzono, że wprowadzenie dodatku BS (0,2–3,0 % mas.) wyraźnie promuje krystalizację PLLA w warunkach chłodzenia z szybkością 1 °C/min. Zawartość 1,5 % mas. BS w osnowie PLLA przyczyniała się do zwiększenia efektywności procesu krystalizacji, co potwierdziły wyniki badań metodą dyfrakcji rentgenowskiej krystalizacji nieizotermicznej w warunkach zmiennej szybkości chłodzenia oraz krystalizacji izotermicznej. Ponadto badania te wykazały, że dodatek BS do PLLA nie zmienia struktury krystalicznej poli(kwasu L-mlekowego). Na podstawie wpływu ustalonych warunków topnienia na przebieg krystalizacji PLLA/BS stwierdzono też, że optymalna temperatura tego procesu wynosi 190 °C. Badania porównawcze topnienia kompozytu PLLA/BS w różnych warunkach (szybkości chłodzenia, temperatury topnienia) również wskazują na zdolność BS do zarodkowania krystalizacji PLLA. Stwierdzono, że krystalizacja kompozytu PLLA/BS zależy od stężenia dodatku BS, temperatury krystalizacji, czasu krystalizacji i szybkości ogrzewania próbki.

2

Experimental study on fracturing coal seams using CaO demolition materials to improve permeability

Tang Y., Yuan L., Xue J, Duan C.

Journal of Sustainable Mining

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2017

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Vol. 16, iss. 2

47--54

EN

Currently, methane gas disasters in underground coal mines are a major problem which seriously threatens safe mining. This study employed soundless chemical demolition for fracturing coal seams with low permeability. Additionally, the fracturing theory and failure mechanisms of soundless chemical demolition agents were investigated. Materials such as CaO, naphthalene-based water reducer, sodium gluconate and silicate cement were used to prepare the novel soundless chemical demolition agent, whose optimum proportion was discovered to be 90:3:5:7 by carrying out orthogonal experiments. The innovative demolition agent cracked briquettes and the maximum width of cracks reached 16.33 mm, showing significant potential for improving the permeability of coal seams.

3

Numerical analysis of the factors affecting the anti-slide pile design

Tang Y., Xie Q., Gou W., Wan R., Li L.

Engineering Transactions

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2017

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Vol. 65, iss. 2

335--350

EN

The use of anti-slide piles is one of the most important landslide remediation methods, and it is widely used in practical engineering. Anti-slide pile design elements include pile plane position and spacing, the anchorage depth, and pile cross-sectional shape and size. With the displacement of an anti-slide pile head as the evaluation index of the anti-sliding effect of antislide pile, ANSYS was used to establish models for numerical simulation to provide analysis of the pile spacing and to determine the anchoring depth and cross- sectional dimensions of the impact of pile top displacement. Using the control variable method, the influence trends and the degree of influence of three factors on the displacement of pile top were studied. Through this analysis, we found that the influence of the pile cross-section size change on the maximum displacement of the pile head is relatively weak, whereas the anchoring depth and pile spacing have a greater impact on the changes in the maximum displacement of the pile; there is a limit of the design parameters, beyond which improvement in the design value is not obvious regarding the limiting of the displacement of the pile top. Further study could investigate the choice of design parameters to optimize the design of anti-slide pile.

4

Analysis on the operating characteristic of UHVDC new hierarchical connection mode to AC system

Sun J., Fu R., Tang Y., Sun W. Q., Huang X.

Journal of Power Technologies

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2016

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Vol. 96, nr 4

229--237

EN

The UHVDC system plays an important role in smart grids. In this paper, a new topology structure of UHVDC hierarchical connection mode to different AC systems is analyzed with a view to improving system transmission abilities. Then a new mathematical model is proposed to calculate the MIIF under different UHVDC hierarchical connection modes. The effect of coupling impedance, equivalent impedance and different DC control mode adopted by two group inverters are illustrated to analyze the MIIF. The method to calculate the MISCR of the multi-infeed HVDC system is also applied to HISCR of UHVDC hierarchical connection mode with the MIIF value. In UHVDC hierarchical connection mode, total power to different hierarchical active current layer can be allocated reasonably to change parameter of the received power grid. Thus, the commutation failure can be analyzed according the MIIF change values of UHVDC hierarchical connection mode to the AC system. Therefore, it may increase the risk of commutation failure in the other converter when one converter is in a state of commutation failure. The correctness of the proposed method is verified by PSCAD simulation. The simulation results are illustrated to verify the operating characteristics of the system.

5

Computer-aided model construction and database design of railway yard information

Tang Y., Zhang W.

Archives of Transport

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2016

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Vol. 38, iss. 2

71--78

EN

Railway yard is the basic composition unit of railways, therefore, the efficiency and quality of railway yard design have a crucial effect on the construction and operation of railways. Plane design is the basis and core of railway yard design, consequently, it is significant to research plane design of railway yard. In this study, through analysis and summary of the research status as well as integrated application of computer technology and railway yard plane design methods, we researched and developed railway yard plane design system based on AutoCAD platform. According to the characteristics of railway yard plane design, we constructed the information model based on which we established specialized database, with the information data organized and managed efficiently; moreover, we put forward methods of constructing geometric models of the plane equipment, meanwhile, we did a focused research on associated design of yard equipment and preliminarily realized linkage design of planar yards.

6

Visualization of Atmosphere Information for Distance Education System Based on Fuzzy Inference Using Customized Knowledge

Ohnishi K., Garcia-Sanchez J. A., Tang Y., Dong F., Hirota K.

Journal of Automation Mobile Robotics and Intelligent Systems

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2015

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Vol. 9, No. 3

18--24

EN

A distance education system is designed based on fuzzy inference, where visualized atmosphere information is shared by all learners in a virtual classroom. It provides high aspirations, low isolated feeling, low stress, and high affinity to learners, and offers learner’s psychological information, individual difference information, and hints of system improvement to the system manager. The effect of visualized atmosphere information in the learner’s psychological states is confirmed by T score of POMS test for 15 graduate students using CAI contents, and comparison experiment with traditional distance education. The proposal of atmosphere information presentation of virtual classroom provides a first step in establishing Education Academy beyond Space Time (EAST).

7

EL and ITG Characterization of Large Areas Black Silicon Solar Cells VIA Screen Printing

Tang Y., Zhou C., Wang W., Zhou S., Zhao Y., Fei J., Cao H.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 3b

95--97

EN

A simple process of texturing silicon (Si) surfaces using gold (Au)-catalyzed wet chemical etching was used to form black Si (BS) on a (100) p-type substrate. The surface became uniformly black after 6 min, with a resulting reflectivity of < 2% over the 400 nm to 1100 nm wavelength range. Large areas (153.18 cm2) of black Si solar cells (BSSCs) with an n+-p-p+ structure were also fabricated using conventional processes, including POCl3 diffusion, screen printing, and co-firing. The resulting cells were divided into two groups according to the emitter (46 and 37 [omega]/􀀀), and their output parameters were studied. The best convention efficiency (Eff) was < 10%. The open-circuit voltage (Voc) was particularly low because of poor surface passivation, and the shunt resistance (Rsh) linearly decreased with the series resistance (Rs). Electroluminescence (EL) and infrared thermography (ITG) measurements were conducted to characterize the BSSCs. Both the emissivity and temperature were low and nonuniform. Optimizing the fabrication process by reducing the etching depth and lowering the dopant sheet resistance led to significant improvement in Voc (~48 mV) and Eff (~3.8% absolute). EL and ITG measurements indicate that Rs is another important factor that accounts for the poor properties of the BSSCs.

PL

W artykule opisano proces teksturowania powierzchni krzemowej w procesie wytrawiania chemicznego z katalizatorem w formie złota, na potrzeby produkcji czarnego krzemu (BS) na podłożu p. Zastosowane rozwiązanie m. in. optymalizacji procesu teksturowania, poprzez redukcję głębokości wytrawiania dało znaczącą poprawę napięcia Voc oraz Eff. Wykonane badania wskazują, że rezystancja szeregowa Rs stanowi ważny czynnik wpływający na działanie ogniw słonecznych, zbudowanych z czarnego krzemu.

8

EL and ITG Characterization of Large Areas Black Silicon Solar Cells VIA Screen Painting

Tang Y., Zhou C., Wang W., Zhou S., Zhao Y., Liu X., Zhao L., Li H., Chen J., Yan B., Fei J., Cao H., Wu X.

Przegląd Elektrotechniczny

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2013

|

R. 89, nr 1b

151--154

EN

A simple process of texturing silicon (Si) surfaces using gold (Au)-catalyzed wet chemical etching was used to form black Si (BS) on a (100) p-type substrate. The surface became uniformly black after 6 min, with a resulting reflectivity of < 2% over the 400 nm to 1100 nm wavelength range. Large areas (153.18 cm 2) of black Si solar cells (BSSCs) with an n + -p-p + structure were also fabricated using conventional processes, including POCl3 diffusion, screen printing, and co-firing. The resulting cells were divided into two groups according to the emitter (46 and 37 Ω/), and their output parameters were studied. The best convention efficiency (Eff) was < 10%. The open-circuit voltage (Voc) was particularly low because of poor surface passivation, and the shunt resistance (Rsh) linearly decreased with the series resistance (Rs). Electroluminescence (EL) and infrared thermography (ITG) measurements were conducted to characterize the BSSCs. Both the emissivity and temperature were low and nonuniform. Optimizing the fabrication process by reducing the etching depth and lowering the dopant sheet resistance led to significant improvement in Voc (~48 mV) and Eff (~3.8% absolute). EL and ITG measurements indicate that Rs is another important factor that accounts for the poor properties of the BSSCs.

PL

Do wytworzenia czarnego krzemu (BS) na podłożu typu p-Si(100) zastosowano prosty sposób teksturowania powierzchni krzemowej metodą chemicznej akwaforty na mokro z zastosowaniem, jako katalizatora, nanocząstek złota (Au). Podłoże staje się jednolicie czarne po 6 min, osiągając współczynnik odbicia < 2% w zakresie długości fali od 400 nm do 1100 nm. Wykonano również dużą powierzchnię czarnych krzemowych ogniw słonecznych (BSSC), ze strukturą n + - p -n +, konwencjonalnymi metodami obejmującymi dyfuzję POC13,drukowanie maski i wyżarzanie. Otrzymane ogniwa dzielą się na dwie grupy w zależności od emitera (46 i 37Ω/): zbadano ich wyjściowe parametry. Najlepsza uzyskana wydajność wynosi < 10%. Napięcie obwodu otwartego (Voc) jest szczególnie niskie z powodu słabej pasywacji powierzchni, a rezystancja równoległa (Rsh) liniowo maleje z rezystancją szeregową (Rs). Charakterystykę BSSC określają pomiary elektroluminescencji (EL) i tomografii w podczerwieni (ITG).Zarówno emisyjność jak i temperatura są niskie i niejednorodne. Optymalizacja procesu wykonana przez zmniejszenie głębokości akwaforty i obniżenie rezystancji warstwy domieszkowania prowadzi do znaczącej poprawy Voc (ok. 48mV) i Eff (ok. 3,8%).

9

The effects of litter layer and soil properties on the soil-atmosphere fluxes of greenhouse gases in karst forest, Southwest China

Cheng J., Lee X., Zhou Z., Wang B., Xing Y., Cheng H., Tang Y.

Polish Journal of Ecology

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2013

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Vol. 61, nr 1

79--92

EN

Temporal variation is a major source of the uncertainty in estimating the fluxes of the greenhouse gases (GHGs) in terrestrial ecosystems, and the GHG fluxes and its affecting factors in the karst region of southwest China remains weakly understood. Using the static chamber technique and gas chromatography method, the CO2, CH4 and N2O fluxes were carried out between 9 and 11 a.m. at 15 day intervals from June 2008 to May 2009 in a Pinus massoniana forest. Two treatments were chosen for this study: undisturbed (soil with litter layer) and disturbed (surface litter removal). Both treatments were found to be the net source of atmospheric CO2 and N2O, but a sink of atmospheric CH4. The seasonality of soil CO2 emission coincided with the seasonal climate pattern, with high CO2 emission rates in the hot-wet season and low rates in the cool-dry season. In contrast, seasonal patterns of CH4 and N2O fluxes were not clear, although higher CH4 uptake rates were often observed in autumn and higher N2O emission rates were often observed in spring (dry-wet season transition). The litter was active in GHG fluxes, and removal of the litter layer reduced soil CO2 emission (17%) and increased CH4 uptake (24%) whereas N2O fluxes were not affected distinctly in the pine forest, indicating that litter layer had an important effect on C exchanges. In the pine forest, soil CO2 emissions and CH4 uptakes correlated significantly with soil temperature (r2 = 0.87, P <0.01; r2 = 0.34, P <0.05, respectively), but had no significant relationship with soil moisture. And there was a significant correlation between CH4 flux and NH4+-N (r2 = 0.39, P < 0.05) and soil inorganic N (r2 = 0.48, P <0.05), but no significant correlation was found between CH4 flux and NO3--N. Moreover, we found a significant negative logarithmic correlation between N2O flux and soil NO3--N concentration (r2 = 0.41, P <0.05), and the relationship between CO2 emission and soil inorganic N content (r2 = 0.35, P < 0.05). These results suggested that soil temperature and mineral N dynamics largely affected the temporal GHG exchanges between forest soil and atmosphere.

10

Structural Vulnerability Analysis for Large-Scale Distributed System based on Multi-layer Topology Model

Xiaohui K., Gang Z., Tang Y., Jin L.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 3b

78-83

EN

Vulnerability analysis of LSDS (Large-Scale distributed systems) has become a growing focus nowadays. A new multi-layer topology model is proposed to describe complex relations between LSDS entities, redundancy mechanism and failure tolerant mechanism in LSDS. Based on this model, a structural vulnerability analysis algorithm based on weight is proposed, which can discover and validate structural vulnerabilities by computing weight of every entity and link with by graph pruning. After that, a new multi-topology model structural vulnerability analysis algorithm is proposed, which can detect the critical entities on different layers of LSDS according to the interdependencies between them. In the end, the efficiency of the algorithms is verified by experiment.

PL

Zaproponowano nowy wielowarstwowy model topologii systemów wielkiej skali rozproszenia LSDS uwzględniający mechanizm błędów i redundancji. Na podstawie tego modelu przeprowadzono analizę wrażliwości systemu.

11

Soft-switching AC module inverter with flyback transformer for photovoltaic power system

Tan G., Tang Y., Gao B., Fu X., Ji Y.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 10a

180-184

EN

This paper presents an AC module inverter for photovoltaic (PV) power system. The PV inverter employs a Buck-Boost converter on the DC side and a flyback inverter on the AC side. Based on capacitive idling (CI) techniques and peak current control method, the proposed inverter shows low current distortion, high power factor, small power decoupling capacitor and soft-switching operation. Analysis and experimental results are provided to demonstrate these excellent features.

PL

W artykule zaprezentowano modułowy przekształtnik AC zastosowany w systemach fotowoltaicznych. Przekształtnik wykorzystuje konwerter Buck-Boost po stronie DC i konwerter typu flyback po stronie AC. Układ bazuje na jałowym biegu pojemnościowym i kontroli wartości szczytowej prądu. (Modułowy przekształtnik AC z transformatorem typy flyback w systemie fotowoltaicznym)

12

Effect of Stubble Heights and Treatment Duration Time on the Performance of Water Dropwort Floating Treatment Wetlands (FTWS)

Xin Z., Li X., Nielsen S., Yan Z., Zhou Y., Tang Y., Guo W., Sun Y.

Ecological Chemistry and Engineering. S

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2012

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Vol. 19, nr 3

315-330

EN

Floating treatment wetlands (FTWs) with Water Dropwort (Oenanthe javanica) were established in winter to investigate their potential role in the purification of eutrophicated water, and to identify the effects of different stubble heights of the Water Dropwort on the performance of the FTWs. The results of the experiments demonstrated: The Water Dropwort FTWs were effective in buffering the pH of the experimental water. The Water Dropwort FTWs were efficient in purifying eutrophicated water, with removal rate for total nitrogen (TN), total phosphorus (TP), ammonium nitrogen ( NH N 4 + - ), and nitrate nitrogen ( NO N 3 - - ) at 91.3, 58.0, 94.6, and 95.5% in the 15-day experiment, respectively. No significant difference in the purification effect was found among different stubble heights of Water Dropwort FTWs. Significant differences between the zero control and the FTWs were found for the removal of TP in the first 11 days; and for the removal of NH N 4 + - in the first 4 days. No significant difference was found between the zero control and the FTWs for NO N 3 - - in the first 4 days, but significant difference was detected after day 4. The optimum treatment duration time for the FTWs with Water Dropwort will depend on the nutrients to be removed. These results will provide basis for further application of the FTWs at large scale, as well as for future studies on the mechanism of nutrient removal process.

PL

Badano proces oczyszczania wód z wykorzystaniem ruchomych mokradeł (FTW) obsadzonych Oenanthe javanica. Celem prowadzonych w zimie badań była ocena ich potencjalnej roli w oczyszczaniu wód zeutrofizowanych oraz określenie wpływu różnych wysokości ściernisk roślinnych na wydajność procesu. Wyniki eksperymentów wykazały, że systemy FTW skutecznie buforowały pH badanej wody. Za pomocą FTW ze zeutrofizowanej wody usunięto azot ogólny (TN), fosfor ogólny (TP), azot amonowy (NH N) 4 + - i azot azotanowy (NO N) 3 - - odpowiednio w ilościach: 91,3, 58,0, 94,6 i 95,5%, w czasie trwania 15-dniowego eksperymentu. Nie wykazano istotnych różnic w efekcie oczyszczania przy stosowaniu różnych wysokości ściernisk roślinnych. Stwierdzono wpływ czasu prowadzenia eksperymentu na usuwanie TP, którego usunięto najwięcej w pierwszych 11 dniach, a NH N 4 + - w ciągu pierwszych 4 dni trwania procesu. Nie stwierdzono istotnej różnicy między kontrolą i FTW dla NO N 3 - - w ciągu pierwszych kilku dni, ale znacząca różnica pojawiła się po 4 dniu. Optymalny czas trwania procesu z wykorzystaniem FTW zależy od składników odżywczych, które mają być usunięte. Opisane wyniki stanowią podstawę zarówno do rozwinięcia zastosowania FTW na dużą skalę, jak i dla przyszłych badań nad mechanizmem procesu usuwania składników odżywczych.

13

A proposal of the parameters determination of vertical axis inclination of tower buildings

Kujawska E., Sztubecki J., Tang Y.

Reports on Geodesy

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2011

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z. 1/90

215-221

EN

In architecture, towering structures are defined as structures whose lateral dimensions are much smaller than the height and they work as a support restrained in the foundation. One of the assessments of the spatial behavior of these structures relates to the determination of spatial variation of the vertical axis from the project position. Without getting into the technique of carrying out the measurements (the classic method of surveying, the GPS-RTK technique), it is assumed that on the object are coordinates xi, yi, zi determined for a sufficiently large number of points that describe solid body of such buildings and which define the center of the structure on selected levels (e.g. at the level of each building floor). Based on calculated in such a way horizontal cross-section centers, it is proposed to determine the vertical axis as the intersection edge of two orthogonal, approximate planes and the parameters determining its slope in the space of the structure.

14

The Effect of Mixed Support of Carbon Black and Nanographite on Catalytic Activity of Pt Catalysts for Methanol Electrooxidation

Teng Z., Wu B., Wang Y., Tang Y., Lu T., Gao Y.

Polish Journal of Chemistry

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2008

|

Vol. 82, nr 11

2197-2206

EN

The effect of mixed support of carbon black and nanographite (CG) on electrocatalytic activity and stability of the supported Pt catalyst for the methanol oxidation was investigated. It was found that the electrocatalytic activity and stability of the supported Pt catalyst for the methanol oxidation depended on the mass ratio of carbon black and nanographite. When the mass ratio was 10:1, the electrocatalytic activity and stability of the CG supported Pt (Pt/CG) catalyst for the methanol oxidation was the best.

15

Reason of deformation researches of historical architecture monuments on Duobao ta Pagoda example

Kujawski E., Tang Y.

Reports on Geodesy

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2005

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z. 3/74

293-298

16

Studies on the Controllable Luminescence Properties from Red to Green of Rare Earth Complexes

Cai ZH., Tang Y., Tan M.

Polish Journal of Chemistry

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2004

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Vol. 78 / nr 3

447-449

17

Synthesis of Eu(III) and Tb(III) Complexes with Two New Aryl Amide Type Tetrapodal Ligands and Their Luminescence Properties

Cai ZH., Tang Y., Zhang J., Liu D., Yu Q., Yin X., Tan M.

Polish Journal of Chemistry

|

2003

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Vol. 77 / nr 4

471-474

18

Zagrożenia konstrukcji budynków o charakterze zabytkowym

Tang Y., Kujawski E.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

|

2002

|

z. 34[195], cz.1

219-223

PL

W niniejszym artykule, o charakterze przeglądowym, przedstawiono czynniki wpływające na trwałość i stabilność konstrukcyjną "wiekowych" budowli o charakterze zabytkowym. Wymieniono też podstawowe działania zabezpieczające dalszą degradację takich obiektów mając na uwadze ich ochronę jako obiektów kultury materialnej z przeszłych okresów.

EN

This paper containg review of environmental and anthropogenic factors which has influence on useful life and construction stability of old monumental structures. This factors arę indicating on protective actions whicb could be taking for its security. Periodical surveys, taking into consideration the way of land development, could make a contribution to protection of those buildings.

19

System kontroli deformacji terenu w otoczeniu budowy stacji metra w Szanghaju

Tang Y., Kujawski E.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

|

2002

|

z. 34[195], cz.1

213-217

PL

Wykonywanie głębokich wykopów w celu realizacji budowli podziemnych wiąże się z problemami kontroli deformacji otaczającego te wykopy terenu. Szczególnie głębokie wykopy, a co się z tym wiąże duży zasięg ich wpływu, występują przy budowie metra metodami odkrywkowymi. W artykule niniejszym przedstawiono schemat sieci punktów kontrolowanych w otoczeniu budowy stacji metra Chang Yanglu w Szanghaju oraz wybrane wartości pomierzonych przemieszczeń.

EN

Executing of deep excavations for realization Ihe underground building is connect with problems of deformation in surrounding ground. Especially very deep excavations madę by opencast method, which have place in metro construction, has influence in large range. This paper presents the sketches of control network for displacement measuring, which was established in surrounding area of underground station Chang Yanglu in Shanghai.

20

Określanie zmiany nachylenia fundamentów na podstawie okresowych pomiarów ich osiadań

Tang Y., Sztubecka M.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

|

2002

|

z. 34[195], cz.1

225-229

EN

The paper presents proposition of calculation inclination foundation in the base of measurement results settlements of benc-mark who are on this foundation. This is very important especially for ancient buildings because inside and outside factors have got influence on buildings safety.