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    Wyświetlanie 1-12 z 12
    Tytuł:
    Study on the behavior of streamwise vortices formed between leading edge tubercles in a compressor cascade
    Autorzy:
    Zheng, Tan
    Qiang, Xiao-Qing
    Teng, Jin-Fang
    Feng, Jin-Zhang
    Powiązania:
    https://bibliotekanauki.pl/articles/281149.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    compressor cascade
    flow separation
    leading edge tubercles
    streamwise vortices
    formation mechanism
    Opis:
    A study has been carried out to investigate the formation mechanism and development of streamwise vortices induced by leading edge tubercles in a high speed compressor cascade. The preliminary assessment of the cascade performance in terms of the total pressure loss coefficient shows that the loss reduction is achieved at high incidence angles. A smaller wavelength leads to higher additional losses at the design point, but gives rise to a greater loss reduction at high incidence angles. The modified cascade with a tubercle wavelength of 4% chord achieves the maximum loss reduction of 36.1% at i = 10◦ , as well as the stall angle improvement of 27.6%. The formation mechanism of streamwise vortices is elaborated on the basis of the streamwise vorticity equation, in which the streamwise turning terms may be responsible for the generation of streamwise vortices. Slices of streamwise vorticity at various streamwise locations, combined with vorticity strength distributions, have been presented to study the development of streamwise vortices. The counter-rotating vortices are divided into the crest-induced streamwise vortices (CSVs) and trough-induced streamwise vortices (TSVs). A streamwise vortex pair formed from a part of the CSV sheets behind troughs, is gradually entrained by the TSV pair along the streamwise direction. In addition, the tubercles with a smaller wavelength result in higher streamwise vorticity strength with which the streamwise vortices interact with the flow separation more sufficiently and delay the separation to a greater extent.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 617-629
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparative Study of the Rhetorical Functions and Features of Personal Pronouns in English and Chinese Legal News
    人称代词在英汉法制新闻中的修辞功能与特征比较研究
    Autorzy:
    Zhang, Qing
    Powiązania:
    https://bibliotekanauki.pl/articles/2098425.pdf
    Data publikacji:
    2021-11-09
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    法制新闻
    人称代词
    对话
    叙事
    修辞
    Legal News
    Personal Pronouns
    Dialogic
    Narrative
    Rhetoric
    Opis:
    This paper mainly discusses the distribution and rhetorical functions of personal pronouns in English and Chinese legal news reports. Through the comparative analysis of some English and Chinese legal news texts, this paper finds the following points: English and Chinese legal news generally have two narrative types: objective narrative and semi-dialogic narrative. The differences in narrative type directly affect the distribution of personal pronouns. In objective narrative, the use of third person pronouns accounts for an absolute proportion, and the frequency of using first person and second person pronouns is close to zero. In semi-dialogic narrative, the use of third person pronouns is still the highest, but only slightly higher than the use of first person and second person pronouns, accounting for only a small number. After analysis, this paper holds that there are three reasons for the uneven distribution: first, the differences between the dialogic style and the narrative style; second, the legal narrative being a story narrative; third, the specific restrictions on the use of legal rhetoric.
    Źródło:
    Comparative Legilinguistics; 2021, 47; 73-103
    2080-5926
    2391-4491
    Pojawia się w:
    Comparative Legilinguistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear finite element analysis of punching shear strength of reinforced concrete slabs supported on L-shaped columns
    Autorzy:
    Zhang, Qing
    Milligan, Graeme J.
    Polak, Maria Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/390883.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    punching shear
    finite element analysis
    L-shaped columns
    slab openings
    Opis:
    Most current concrete design codes include provisions for punching shear of reinforced concrete slabs supported on columns with L, T, and cruciform shapes. Reference studies verifying the accuracy of these code provisions are typically not provided. Empirical data of punching failures of slabs supported on columns with L, T, and cruciform shapes are limited due to the cost and time required to test specimens with slab thicknesses and column sizes commonly used in practice. In this paper, the punching shear behaviour of five interior L-shaped slab-column connections, one without a slab opening and four with slab openings, subjected to static concentric loading are analyzed using a plasticity-based nonlinear finite element model (FEM) in ABAQUS. The FEM is similar to models previously calibrated at the University of Waterloo and are calibrated considering nine slabs that are tested to study the impact of column rectangularity on the punching shear behaviour of reinforced concrete slabs. The finite element analysis results indicate that shear stresses primarily concentrate around the ends of the L, and that current code predictions from ACI 318-19 and Eurocode 2 may be unconservative due to the assumed critical perimeters around L-shaped columns.
    Źródło:
    Budownictwo i Architektura; 2020, 19, 4; 125-138
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ON JUDGE’S TRIAL DISCOURSE IN CHINESE COURTROOM FROM GOAL-DRIVEN PERSPECTIVE
    DYSKURS SĘDZIOWSKI W CHINACH Z PERSPEKTYWY ZORIENTOWANEJ NA CEL
    Autorzy:
    ZHANG, Qing
    Powiązania:
    https://bibliotekanauki.pl/articles/921283.pdf
    Data publikacji:
    2019-11-28
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    judge’s trial discourse
    goal principle
    goal strategy
    discourse strategy
    Chinese courtroom
    Opis:
    Any act has certain goal, and the judge’s trial discourse is a structured and layered goal system. Judges normally adopt some discourse strategies to reach their trial goals. Based on our trial corpora, we find judges commonly adopt some strong goal-driven discourse strategies, such as question-answer strategy, power control strategy, presupposition strategy, repetition strategy, and interruption strategy, etc., in order to realize their trial goals as well as discourse goals. Strategy in effect refers to means, with which the goal of discourse is to be achieved. As words are intended for both the expression and the achievement of goals, the choice of a means or a strategy relies on the decision of the goal. Only from this perspective is the link between strategy and goal meaningful, and in this sense, strategy means rhetoric. This paper aims to study the judge’s discourse strategies adopted in trials in Chinese courtrooms from the perspective of the goal principle.
    Źródło:
    Comparative Legilinguistics; 2019, 38, 1; 65-82
    2080-5926
    2391-4491
    Pojawia się w:
    Comparative Legilinguistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of $Ca{2+}$ and $SO_4^{2-}$ ions on fluorite flotation
    Autorzy:
    Xun, Luobing
    Hu, Jiacheng
    Shi, Qing
    Zhang, Guofan
    Powiązania:
    https://bibliotekanauki.pl/articles/1448205.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fluorite
    flotation
    calcium cation
    sulphate anion
    Opis:
    The effects of $Ca^{2+}$ and $SO_4^{2-}$ on the flotation behaviour of fluorite with sodium oleate as a collector and the underlying mechanism by which these effects were investigated via micro-flotation experiments, solution chemistry calculations, and X-ray photoelectron spectroscopy. The results indicated that the addition of $SO_4^{2-}$ and $Ca^{2+}$ inhibited fluorite flotation and the inhibition effect was increased by the addition of pH. This was mainly due to the increase of the sulphate-containing components in the solution and the adsorption of $SO_4^{2-}$ on the surface of fluorite. With the increase of pH, the alkalinity of the solution increases, OH- and more $SO_4^{2-}$ are further adsorbed on the fluorite surface, thereby reducing the recovery of fluorite flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 2; 95-104
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transition, Electronic and Magnetic Properties of CsN and RbN Alloys under Pressure
    Autorzy:
    Wei, Xiao-Ping
    Zhang, Ya-Ling
    Wang, Qing
    Deng, Jian-Bo
    Powiązania:
    https://bibliotekanauki.pl/articles/1401895.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.55.Ak
    74.62.Fj
    Opis:
    Using full-potential local-orbital minimum-basis method within density functional theory, we study the phase transition, electronic and magnetic properties of CsN and RbN alloys under external pressure. Concerning the phase transition, we consider three possible crystal structures, including caesium chloride (CsCl), rock salt (RS) and zinc blende (ZB) ones. Calculations of enthalpy exhibit that a pressure-induced phase transition occurs between the three structures, and the phase transitions are difficult to be distinguished under ambient condition (P=0 GPa). As the further increase of pressure, they can be specified clearly. In addition, the electronic calculations indicate that both alloys are half-metallic ferromagnets with a total magnetic moment of 2.000 $μ_{B}$, which is promising for fabricating spin injection devices. Finally, we discuss the electronic and magnetic properties of CsN and RbN under external pressure. A pressure-induced delocalized electronic states and magnetic phase transition are observed in RbN and CsN alloys.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 373-376
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Purification and characterization of a novel laccase from the mushroom Pleurotus nebrodensis
    Autorzy:
    Tian, Guo-Ting
    Zhang, Guo-Qing
    Wang, He-Xiang
    Ng, Tzi
    Powiązania:
    https://bibliotekanauki.pl/articles/1039721.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Pleurotus nebrodensis
    Laccase
    purification
    characterization
    Opis:
    A novel laccase with a molecular mass of 64 kDa and the N-terminal sequence AIGPDDTINF was isolated from fresh fruiting bodies of the mushroom Pleurotus nebrodensis. The purification protocol comprised ion exchange chromatography on DEAE-cellulose, CM-cellulose, and Q-Sepharose, and gel filtration on Superdex 75. The laccase was adsorbed on DEAE-cellulose and Q-Sepharose, but not on CM-cellulose. It demonstrated an optimal temperature of 70°C. The enzyme activity increased steadily over the temperature range 20°C-70°C. There was only a slight reduction in activity at 80°C. However, all activity disappeared following exposure to 100°C for 10 minutes. The enzyme activity changed only slightly over the pH range 3-5, with the optimum at pH 5, but underwent a precipitous decline when the pH was elevated to 6, and was undetectable at pH 8 and pH 9.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 3; 407-412
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Position-encoding convolutional network to solving connected text CAPTCHA
    Autorzy:
    Qing, Ke
    Zhang, Rong
    Powiązania:
    https://bibliotekanauki.pl/articles/2147133.pdf
    Data publikacji:
    2022
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    deep neural network
    position encoding CNN
    text-based CAPTCHA recognition
    character recognition
    Opis:
    Text-based CAPTCHA is a convenient and effective safety mechanism that has been widely deployed across websites. The efficient end-to-end models of scene text recognition consisting of CNN and attention-based RNN show limited performance in solving text-based CAPTCHAs. In contrast with the street view image and document, the character sequence in CAPTCHA is non-semantic. The RNN loses its ability to learn the semantic context and only implicitly encodes the relative position of extracted features. Meanwhile, the security features, which prevent characters from segmentation and recognition, extensively increase the complexity of CAPTCHAs. The performance of this model is sensitive to different CAPTCHA schemes. In this paper, we analyze the properties of the text-based CAPTCHA and accordingly consider solving it as a highly position-relative character sequence recognition task. We propose a network named PosConv to leverage the position information in the character sequence without RNN. PosConv uses a novel padding strategy and modified convolution, explicitly encoding the relative position into the local features of characters. This mechanism of PosConv makes the extracted features from CAPTCHAs more informative and robust. We validate PosConv on six text-based CAPTCHA schemes, and it achieves state-of-the-art or competitive recognition accuracy with significantly fewer parameters and faster convergence speed.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2022, 12, 2; 121--133
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of a nonlinear tuned mass damper by using the multi-scale method
    Autorzy:
    Liu, Junfeng
    Yao, Ji
    Huang, Kun
    Zhang, Qing
    Ze, Li
    Powiązania:
    https://bibliotekanauki.pl/articles/2104766.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    nonlinear characteristics
    complex average method
    multi-scale method
    nonlinear design
    control performance
    Opis:
    A tuned mass damper is a kind of vibration damping device which has been widely used in tall buildings, machinery, bridges, aerospace engineering and other fields. In practical engineering applications, due to large deformation caused by large displacement, errors in engineering constructions and the existence of limit devices, the structure and tuned mass dampers inevitably produce some nonlinear characteristics, but these nonlinearities are often ignored. The results of this study confirm that the nonlinearity of the structure and the mass damper should be considered in the process of optimal frequency design, otherwise there will be a large deviation between the design optimal frequency of the mass damper and the actual optimal frequency. In this paper, nonlinear characteristics of the tuned mass damper and the main structure are considered. The first-order differential equations are obtained by using the complex average method, and the nonlinear equations of the tuned mass damper system are derived by using the multi-scale method. On this basis, the parameters are determined. The numerical results show that the error of the approximate solution method is small in the given example. The nonlinear tuned mass damper with nonlinear design exhibits a better control performance.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 463--477
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of N-carboxymethyl chitosan as a selective depressant for talc in flotation of chalcopyrite
    Autorzy:
    Liu, Cheng
    Feng, Qiming
    Shi, Qing
    Zhang, Wencai
    Song, Shaoxian
    Powiązania:
    https://bibliotekanauki.pl/articles/110512.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chalcopyrite
    talc
    flotation separation
    N-carboxymethyl chitosan
    Opis:
    Flotation separation of chalcopyrite from talc is difficult because of the natural hydrophobicity of two minerals. In this work, the flotation separation of chalcopyrite from talc using N-carboxymethyl chitosan as a depressant for talc was studied. The micro-flotation results indicated that the flotation separation of chalcopyrite from talc cannot be realized effectively at pH 9 with low concentration of N-carboxymethyl chitosan, in the presence of calcium ions, talc was more efficiently depressed by N-carboxymethyl chitosan, while the chalcopyrite recovery was not influenced. Contact angle, zeta potential and adsorption results showed that Ca2+ and CaOH+ absorbed on the talc surface and increased the absorption amount of N-carboxymethyl chitosan on the mineral surface, and increased hydrophilicity of talc surface, resulting the selective depression for talc in chalcopyrite flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 108-115
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Myocardial remodeling in rats with metabolic syndrome: role of Rho-kinase mediated insulin resistance
    Autorzy:
    Li, Chuan-Bao
    Li, Xiao-Xing
    Chen, Yu-Guo
    Gao, Hai-Qing
    Bao, Cheng-Mei
    Liu, Xiang-Qun
    Bu, Pei-Li
    Zhang, Juan
    Zhang, Yun
    Ji, Xiao-Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/1039743.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Rat
    Metabolism
    Myocardium
    Phosphorylation
    Insulin resistance
    Opis:
    Insulin resistance (IR) plays a critical role in metabolic syndrome (MS). Previous studies have demonstrated that activated ROCK is increased in MS patients. However, the effect of Rho-kinase (ROCK) on IR has not been definitely determined. Thus, the aims of the present study were to determine whether ROCK activation induces IR or affects myocardial structure and function, as well as the possible mechanisms underlying this process. Wistar rats fed high fat, high glucose and high salt diet sewed as model of MS and we used transmission electron microscopy, echocardiogram technology, and terminal deoxynucleotidyl transferase-mediated DNA nick-end labeling staining to identify any myocardial damage. The protein levels of MYPT-1 (characteristic of ROCK activation), IRS-1 and AKT were analyzed by immunohistochemistry and Western blotting. In hearts from MS rats, we found increased protein levels of phospho-MYPT-1 and phospho-IRS-1 (Ser307) and decreased phospho-AKT compared to levels in normal rats. In conclusion, the results suggest that ROCK-mediated IR is involved in the development of myocardial impairments in MS rats and that this effect is mediated probably via the IRS-1/PI3-kinase/AKT pathway.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 2; 249-254
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Insight into the Catalytic Mechanism of MFe2O4 (M = Ni, Zn and Co) on the Thermal Decomposition of TKX-50
    Autorzy:
    Hou, Xiaoting
    Zhang, Ming
    Zhao, Fengqi
    Yang, Yanjing
    An, Ting
    Li, Hui
    Pan, Qing
    Wang, Xiaohong
    Zhang, Kun
    Powiązania:
    https://bibliotekanauki.pl/articles/27788010.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    bimetallic iron oxide
    thermal decomposition
    TKX-50
    catalysis
    mechanism
    Opis:
    Synthesized dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate (TKX-50) owes its outstanding application prospects in the field of insensitive solid propellants not only to its high energetic performance but also to its low mechanical sensitivity. Based on the excellent catalytic activity of bimetallic iron oxides for the thermal decomposition of TKX-50, the catalytic mechanism of bimetallic iron oxides (NiFe2O4, ZnFe2O4 and CoFe2O4) for TKX-50 pyrolysis has been explored. For this study, the decomposition process of TKX-50, before and after mixing with the bimetallic iron oxides NiFe2O4, ZnFe2O4 and CoFe2O4 was monitored by in-situ FTIR and gas-phase MS-FTIR instruments. Of the different catalysts, ZnFe2O4 gave the best result for reducing the initial decomposition temperature of TKX-50. Additionally, the activation energy of functional group cleavage of TKX-50, before and after mixing with ZnFe2O4, was also calculated for mechanism analysis from the results of the in-situ FTIR measurements. The results showed that the condensate and the gas-phase decomposition products of TKX-50 remained unchanged after mixing with different catalysts, while the activation energy of tetrazole ring cleavage was significantly reduced. The results of this study will be helpful for the rational design of insensitive solid propellant formulations containing TKX-50, and for understanding the pyrolysis mechanisms of TKX-50 before and after mixing with the efficient catalyst ZnFe2O4.
    Źródło:
    Central European Journal of Energetic Materials; 2021, 18, 2; 223--244
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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