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Heat Transfer and Aerodynamics of Complex Shroud Leakage Flows in a Low-Pressure Turbine

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Journal of Thermal Science 2013年第5期22卷 447-458页

作者： Wang Pei Du Qiang yang xiao Jie Zhu jun Qiang Institute of Engineering Thermophysics Chinese Academy of Sciences University of Chinese Academy of Sciences

A numerical investigation on over-shroud & inter-shroud leakage flow has been carried out to explore the underneath flow physics at the stage of shrouded Low Pressure(LP) *** with the No inter-Shroud gap's Leakage flow Model(NSLM) and With inter-Shroud gap's Leakage flow Model(WSLM),the aerodynamic characteristics and the heat transfer performance have been *** the aerodynamic point of view,it is concluded that due to the pressure difference between the rotor's passage and the over-shroud cavity,in the stream-wise direction,flow structure has been modified,and the inter-shroud leakage flow may even cause flow separation in the vicinity of the blade passage's *** the circumferential direction,separation flows appear over the rotor's shroud surface(upper platform of the shroud).Meanwhile,from the point of view of heat transfer,further provision on contour maps of the non-dimensional Nusselt number reveals that the reattachment of leakage flow would enhance the heat transfer rates and endanger the rotor's labyrinth fins over the ***,due to the limited amount of inter-shroud leakage flow(current computational model),temperature distribution variation along the blade surface(near the rotor's tip section) seems to have only minor insignificant *** the end of the paper,the author puts forward some recommendations for the purpose of future successful turbine design.

关键词： over-shroud leakage flow inter-shroud leakage flow shrouded LP turbine

Solvothermal synthesis of nano-CeO_2 aggregates and its application as a high-efficient arsenic adsorbent

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Rare Metals 2019年第1期38卷 73-80页

作者： Jing-Hua Pang Ying Liu jun Li xiao-Jiao yang College of Materials Science and Engineering Sichuan University

Aggregates of cerium dioxide nanoparticles(nano-CeO_2) were successfully prepared via a facile solvothermal process in this study. The crystallographic information and morphological information of nano-CeO_2 were systematically studied by X-ray diffraction(XRD),transmission electron microscopy(TEM), laser particle size analyzer(LA) and specific surface area and pore size analyzer during the solvothermal process. Among all the obtained samples, the 18-h solvothermal-prepared nano-CeO_2 aggregates show the best crystallinity and the largest specific surface area of 110.92 m^2·g^(-1). Owing to the high activity derived from the high specific surface area of the aggregates, the application as arsenic(As) adsorption was also studied. The adsorption efficiency of arsenic by nano-CeO_2 aggregates was established as the function of adsorbent dose, then pH value and at last adsorption *** results indicate that the nano-CeO_2 aggregates show a high efficiency in removing arsenic from low As concentration solution, from which the nano-CeO_2 adsorbent could be easily separated. In addition, the adsorption kinetics is best fitted to pseudo-second-order model(R^2 = 0.99999).

关键词： Nano-CeO2 Large surface Aggregates Solvothermal Removal of arsenic

Systematic study of proton radioactivity half‑lives

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Nuclear Science and Techniques 2023年第2期34卷 167-177页

作者： yang‑yang Xu xiao‑Yuan Hu De‑Xing Zhu Xi‑jun Wu Peng‑Cheng Chu xiao‑Hua Li School of Nuclear Science and Technology University of South ChinaHengyang 421001China School of Math and Physics University of South ChinaHengyang 421001China The Research Center for Theoretical Physics Science SchoolQingdao University of TechnologyQingdao 266033China National Exemplary Base for International Science and Technology.Collaboration of Nuclear Energy and Nuclear Safety University of South ChinaHengyang 421001China Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment University of South ChinaHengyang 421001China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal UniversityChangsha 410081China

In the present study,on the basis of the screened electrostatic effect of the Coulomb potential,we propose an improved Gamow model within the centrifugal potential in which there are only two adjustable parameters,i.e.,the screened parameters t and g,which represent the combined effect of the interaction potential and reduced mass of the emitted proton-daughter nucleus on the half-life of proton radioactivity in the overlapping *** this model,we systematically calculated the proton radioactivity half-lives of 31 spherical nuclei and 13 deformed nuclei and obtained corresponding root-mean-square deviations of 0.274 and 0.367,*** relationship between the proton radioactivity half-life of 177Tlm and the corresponding angular momentum l removed by the emitted proton is also *** addition,we used the proposed model to predict the proton radioactivity half-lives of 18 nuclei whose proton radioactivity is energetically allowed or observed but not yet quantified in *** comparison,we used the universal decay law of proton radioactivity proposed by Qi et al.(Phys Rev C 85:011303,***://***/10.1103/PhysR evC.85.011303),and the new Geiger–Nuttall law of proton radioactivity proposed by Chen et al.(Eur Phys J 55:214,***://***/10.1140/epja/i2019-12927-7).

关键词： Proton radioactivity Gamow model Half-lives

Novel two-dimensional transition metal chalcogenides created by epitaxial growth

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Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 23-37页

作者： Hong-Liang Lu Yu-yang Zhang xiao Lin Hong-jun Gao Institute of Physics and University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Two-dimensional(2D) materials have been a very important field in condensed matter physics, materials science, chemistry, and electronics. In a variety of 2D materials, transition metal chalcogenides are of particular interest due to their unique structures and rich properties. In this review, we introduce a series of 2D transition metal chalcogenides prepared by epitaxial growth. We show that not only 2D transition metal dichalcogenides can be grown, but also the transition metal chalcogenides that do not have bulk counterparts, and even patterned transition metal chalcogenides can be fabricated. We discuss the formation mechanisms of the novel structures, their interesting properties, and potential applications of these 2D transition metal chalcogenides. Finally, we give a summary and some perspectives on future studies.

关键词： 2D materials transition metal chalcogenides epitaxial growth

Investigation on the stall types in impellers with different blade numbers

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Journal of Hydrodynamics 2023年第2期35卷 299-313页

作者： xiao-dong Liu Yao-jun Li Zhu-qing Liu Wei yang College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System China Agricultural UniversityBeijing100083China

Stall is a complex flow phenomenon and its existence usually shows significant differences in different impeller *** this paper,the flow field characteristics and mechanism of stall types in impellers with different blade numbers were studied through the combination of experiment and numerical simulation at stall inception *** the experiments,it was observed that the five-blade impeller entered the rotating stall stage from a relatively stable flow field within a small flow rate *** the six-blade impeller,the root cause that stall vortices appeared in channels alternately rather than each one evenly was also reasonably *** validated numerical simulation method was utilized to reveal the three-dimensional flow field in impeller *** results indicate the swirling vortex near the impeller shroud was periodically sucked in and escaped from region near the blade suction side,which was the fundamental driving force of rotating *** sudden change of flow field caused by the fusion of the separation vortex at the channel inlet and the vortex induced by the swirling vortex near shroud is the essential reason for the formation of alternating ***’s more,the stall inception flow field is clearly defined in impellers,which is of great significance for the further analysis of stall *** on the distribution characteristics of vortex structure near impeller shroud with different blade numbers at different flow rate conditions,this paper deeply investigated the formation mechanism of different stall types in impellers.

关键词： Numerical simulation high-frequency particle image velocimetry(PIV) impellers swirling vortex stall type

Interleukin-17A facilitates tumor progression via upregulating programmed death ligand-1 expression in hepatocellular carcinoma

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World Journal of Gastrointestinal Oncology 2025年第1期17卷 176-198页

作者： Zhong-Xia yang Li-Ting Zhang xiao-jun Liu Xue-Bin Peng xiao-Rong Mao The First School of Clinical Medicine Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of Infectious Diseases The First Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of Radiotherapy Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina

BACKGROUND Hepatocellular carcinoma(HCC)is an inflammation-associated tumor with a dismal *** has become an important treatment strategy for HCC,as immunity is closely related to inflammation in the tumor *** regulates the expression of programmed death ligand-1(PD-L1)in the immunosuppressive tumor microenvironment and affects im-munotherapy ***-17A(IL-17A)is involved in the remodeling of the tumor microenvironment and plays a protumor or antitumor role in different *** hypothesized that IL-17A participates in tumor progression by affe-cting the level of immune checkpoint molecules in *** upregulation of PD-L1 expression in HCC cells by IL-17A was assessed by reverse transcription PCR,western blotting,and flow *** studies were conducted with gene knockout models and pathway *** function of IL-17A in immune evasion was explored through coculture of T cells and HCC *** effects of IL-17A on the malignant biological behaviors of HCC cells were evaluated in vitro,and the antitumor effects of an IL-17A inhibitor and its synergistic effects with a PD-L1 inhibitor were studied in *** IL-17A upregulated PD-L1 expression in HCC cells in a dose-dependent manner,whereas IL-17A receptor knockout or treatment with a small mothers against decapentaplegic 2 inhibitor diminished the PD-L1 expression induced by ***-17A enhanced the survival of HCC cells in the coculture ***-17A increased the viability,G2/M ratio,and migration of HCC cells and decreased the apoptotic *** D1,VEGF,MMP9,and Bcl-1 expression increased after IL-17A treatment,whereas BAX expression *** combination of IL-17A and PD-L1 inhibitors showed synergistic antitumor efficacy and increased cluster of differentiation 8+T lymphocyte infiltration in an HCC mouse *** IL-17A upregulates PD-L1 expression via the IL-17A receptor/phosphorylation-small mothers against

关键词： Interleukin-17A Programmed death ligand-1 Interleukin-17A receptor Small mothers against decapentaplegic 2 Hepatocellular carcinoma Immunotherapy

用于列车网络的司机显示单元的系统设计与实现

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铁路计算机应用 2011年第7期20卷 50-52页

作者：肖阳俊吴旋王爱武李金波南车南京浦镇车辆有限公司南京210031 中国铁道科学研究院电子计算技术研究所北京100081

地铁列车司机显示单元(DDU:Dirver Display Unit)作为列车网络的重要部分,是完成人机对话和系统信息显示的重要系统。为驾驶员的操作及地铁车辆安全运行提供信息保证。本设计选择X86架构计算机作为DDU单元的硬件平台,嵌入Linux操作系统... 详细信息

地铁列车司机显示单元(DDU:Dirver Display Unit)作为列车网络的重要部分,是完成人机对话和系统信息显示的重要系统。为驾驶员的操作及地铁车辆安全运行提供信息保证。本设计选择X86架构计算机作为DDU单元的硬件平台,嵌入Linux操作系统,构建了基于CANopen通信协议的地铁列车司机显示单元。本文详细介绍了DDU的系统原理和软件架构设计。

关键词：司机显示单元列车网络嵌入式Linux CANopen

An optimal method for the power spectrum measurement

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Chinese Journal of Astronomy and Astrophysics 2009年第2期9卷 227-236页

作者： Yi-Bin yang Long-Long Feng jun Pan xiao-Hu yang Center for Astrophysics University of Science and Technology of China Hefei 230026 China Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Shanghai Astronomical Observatory the Partner Group of MPA Nandan Road 80 Shanghai 20030 China

An aliasing effect brought up by mass assignment onto Fast Fourier Transformation （FFT） grids may bias measurement of the power spectrum of large scale structures. In this paper, based on the Beylkin＇s unequally spaced FFT technique, we propose a new precise method to extract the true power spectrum of a large discrete data set. We compare the traditional mass assignment schemes with the new method using the Daub6 and the 3rd-order B-spline scaling functions. Our measurement of Poisson samples and samples of N-body simulations shows that the B-spline scaling function is an optimal choice for mass assignment in the sense that （1） it has a compact support in real space and thus yields an efficient algorithm （2） without any extra corrections. The Fourier space behavior of the 3rd-order B-spline scaling function enables it to be able to accurately recover the true power spectrum with errors less than 5% up to k 〈 kN. It is expected that such a method can be applied to higher order statistics in Fourier space and will enable us to have a precision capture of the non-Gaussian features in the large scale structure of the universe.

关键词： large scale structure of universe -- methods numerical

The Shackling Effect in Cyclic Azobenzene Liquid Crystal

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Chinese Journal of Polymer Science 2022年第6期40卷 584-592页

作者： yang xiao Chong He Zi-Fan yang Er-Qiang Chen Huan-jun Lu xiao-Hong Li Ying-Feng Tu State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenter for Soft Matter Science and EngineeringCollege of ChemistryPeking UniversityBeijing 100871China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China

We demonstrate here a novel method for the design of liquid crystals(LCs)via the cyclization of mesogens by flexible *** two azobenzene-4,4′-dicarboxylate derivatives,the cyclic dimer,cyclic bis(tetraethylene glycol azobenzene-4,4′-dicarboxylate)(CBTAD),shows LC properties with smectic A phase,while its linear counterpart,bis(2-(2′-hydroxyethyloxy))ethyl azobenzene-4,4′-dicarboxylate(BHAD),has no LC *** difference is ascribed to the shackling effect from the cyclic topology,which leads to the much smaller entropy change during phase transitions and increases the isotropic temperature greatly for *** addition,the trans-to-cis isomerization of azobenzene groups under UVlight is also limited in *** the reversible isomerization of azobenzene groups,CBTAD showed interesting isothermal phase transition behaviors,where the LC phase disappeared upon photoirradiation of 365 nm UV-light,and recovered when the UV-light was *** with the smectic LC nature,a novel UV-light tuned visible light regulator was designed,by simply placing CBTAD in two glass *** scattered phase of smectic LC was utilized as the“OFF”state for light passage,while the UV-light induced isotropic phase was utilized as the“ON”*** shackling effect outlined here should be applicable for the design of cyclic LC oligomers/polymers with special properties.

关键词： Azobenzene Cyclic Liquid crystals Isothermal phase transition