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Lagrangian-based investigation of the transient flow structures around a pitching hydrofoil

Acta Mechanica Sinica 2016年第1期32卷 64-74页

作者： qin Wu Biao huang Guoyu Wang School of Mechanical and Vechicular Engineering Beijing Institute of Technology

The objective of this paper is to address the transient flow structures around a pitching hydrofoil by com- bining physical and numerical studies. In order to predict the dynamic behavior of the flow structure effectively, the Lagrangian coherent structures （LCS） defined by the ridges of the finite-time Lyapunov exponent （FTLE） are utilized under the framework of Navier-Stokes flow computations. In the numerical simulations, the k-w shear stress trans- port （SST） turbulence model, coupled with a two-equation F-Reo transition model, is used for the turbulence closure. Results are presented for a NACA66 hydrofoil undergoing slowly and rapidly pitching motions from 0° to 15° then back to 0° at a moderate Reynolds number Re = 7.5 × 105. The results reveal that the transient flow structures can be observed by the LCS method. For the slowly pitching case, it consists of five stages： quasi-steady and laminar, transition from laminar to turbulent, vortex development, large-scale vortex shedding, and reverting to laminar. The observation of LCS and Lagrangian particle tracers elucidates that the trailing edge vortex is nearly attached and stable during the vortex development stage and the interaction between the leading and trailing edge vortex caused by the adverse pres- sure gradient forces the vortexes to shed downstream during the large-scale vortex shedding stage, which corresponds to obvious fluctuations of the hydrodynamic response. For the rapidly pitching case, the inflection is hardly to be observed and the stall is delayed. The vortex formation, interaction, and shedding occurred once instead of being repeated three times, which is responsible for just one fluctuation in the hydrody- namic characteristics. The numerical results also show that the FTLE field has the potential to identify the transient flows, and the LCS can represent the divergence extent of infinite neighboring particles and capture the interface of the vortex region.

关键词： Transient flow structure Pitching hydrofoilFinite-time Lyapunov exponent Lagrangian coherentstructures

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Improvement in Cr Nanoparticle Content in Ni-Cr Film by Co-deposition with Combined Surfactant HPB and CTAB

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Acta Metallurgica Sinica(English Letters) 2017年第10期30卷 999-1007页

作者： Li-Juan qin Yuan-Chao huang Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences College of Material Science and Engineering University of Science and Technology of China

The effects of single surfactant hexadecylpyridinium bromide（HPB） and cetyltrimethylammonium bromide（CTAB） and the combination of HPB and CTAB on the Cr nanoparticle content in the Ni-Cr film prepared by codeposition were investigated. Single HPB/CTAB addition inhibited the oxidation and amorphous transformation of the Cr nanoparticles in the plating bath and effectively stabilized the Cr nanoparticles content at approximately 10 mass% as a function of time. Moreover, the combination of HPB and CTAB formed a cylindrical micelle structure on the Cr nanoparticle surface, which prompted the formation of a layer of NiCr2O4. As a result, the Cr nanoparticle content increased sharply to 20 mass%.

关键词： Co-deposition Ni-Cr film Cr nanoparticle content HPB CTAB

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Dynamics of cavitation–structure interaction

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Acta Mechanica Sinica 2017年第4期33卷 685-708页

作者： Guoyu Wang qin Wu Biao huang School of Mechanical Engineering Beijing Institute of Technology Department of Thermal Engineering Tsinghua University

Cavitation–structure interaction has become one of the major issues for most engineering applications. The present work reviews recent progress made toward developing experimental and numerical investigation for unsteady turbulent cavitating flow and cavitation–structure interaction. The goal of our overall efforts is to（1） summarize the progress made in the experimental and numerical modeling and approaches for unsteady cavitating flow and cavitation–structure interaction,（2） discuss the global multiphase structures for different cavitation regimes, with special emphasis on the unsteady development of cloud cavitation and corresponding cavitating flow-induced vibrations,with a high-speed visualization system and a structural vibration measurement system, as well as a simultaneous sampling system,（3） improve the understanding of the hydroelastic response in cavitating flows via combined physical and numerical analysis, with particular emphasis on the interaction between unsteady cavitation development and structural deformations. Issues including unsteady cavitating flow structures and cavitation–structure interaction mechanism are discussed.

关键词： cavitation unsteady turbulent multiphase turbulence vortex visualization compressible hydrodynamic emphasis

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Microglia-associated neuroinflammation is a potential therapeutic target for ischemic stroke

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Neural Regeneration Research 2021年第1期16卷 6-11页

作者： Wan Zhang Tian Tian Shao-Xin Gong Wen-Qian huang qin-yi Zhou Ai-Ping Wang ying Tian Institute of Clinical Research Affiliated Nanhua HospitalUniversity of South ChinaHengyangHunan ProvinceChina Department of Clinical Laboratory the First Hospital of ChangshaChangshaHunan ProvinceChina Department of Pathology the First Affiliated Hospital of University of South ChinaHengyangHunan ProvinceChina

Microglia-associated neuroinflammation plays an important role in the pathophysiology of ischemic *** activation and polarization,and the inflammatory response mediated by these cells play important roles in the development,progression and outcome of brain injury after ischemic ***,there is no effective strategy for treating ischemic stroke in clinical ***,it is clinically important to study the role and regulation of microglia in *** this review,we discuss the involvement of microglia in the neuroinflammatory process in ischemic stroke,with the aim of providing a better understanding of the relationship between ischemic stroke and microglia.

关键词： brain cells central nervous system inflammation injury macrophages repair review stroke

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Role of CD8^(+) T lymphocyte cells:Interplay with stromal cells in tumor microenvironment

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Acta Pharmaceutica Sinica B 2021年第6期11卷 1365-1378页

作者： qin Xie Jian Ding yi Chen College of Pharmaceutical Sciences Zhejiang UniversityHangZhou 310012China Division of Anti-Tumor Pharmacology Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China University of Chinese Academy of Sciences Beiing 100049China State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Shanghai Hai He Pharmaceutical Co. Ltd.Shanghai 201203China

CD8^(+) T lymphocytes are pivotal cells in the host response to antitumor *** microenvironments provide the conditions necessary for regulating infiltrating CD8^(+) T cells in favor of tumor survival,including weakening CD8^(+) T cell activation,driving tumor cells to impair immune attack,and recruiting other cells to reprogram the immune *** in tumor microenvironment,stromal cells exert immunosuppressive skills to avoid CD8^(+) T cell *** this review,we explore the universal function and fate decision of infiltrated CD8^(+) T cells and highlight their antitumor response within various stromal architectures in the process of confronting neoantigen-specific tumor ***,this review provides a foundation for the development of antitumor therapy based on CD8^(+)T lymphocyte manipulation.

关键词： CD8+T lymphocyte Stromal cell Tumor microenvironment Immunosuppression Immunotherapy Antitumor

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Nucleation Mechanism of Polycrystalline Diamond Film Deposited on Ceramic Alumina by Microwave Plasma Chemical Vapor Deposition

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Chinese Physics Letters 1996年第7期13卷 557-560页

作者： XIA yi-ben MO Yao-wu WANG Yu huang Xiao-qin CHEN Da-ming WANG Hong College of Materials Science and Engineering Shanghai UniversityShanghai 201800

Polycrystalline diamond films have been deposited on ceramic alumina substrates by microwave plasma chemical vapor deposition *** of the emission spectra in the microwave plasma with the microwave power and the vapor pressure in the reaction chamber is studied,*** between the hydrogen atomic spectra and the average energy of the electrons in the plasma,as well as the mechanism of diamond film deposition on ceramic alumina are discussed.

关键词： ceramic microwave Diamond

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Exploration of the Mechanisms for the Low Sensitivity of Deposition Flux to Upstream Sediment Reduction in the North Passage, Yangtze Estuary

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China Ocean Engineering 2023年第4期37卷 533-546页

作者： WANG Xiao-guang ZHANG Wei TONG Chao-feng LEI Zhi-yi qin Jie JI Xiao-mei huang Rui The National Key Laboratory of Water Disaster Prevention Hohai UniversityNanjing 210098China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

Deltas are densely populated industrialized regions,and home to important ports and navigation *** to human interferences,the Yangtze Estuary has experienced a significant reduction in sediment load caused by the Three Gorges Dam(TGD),as well as adjustment to local morphodynamics by the Deep-water Navigation Channel(DNC).While the dramatic reduction in sediment triggers the increased channel erosion,the deposition flux of the DNC located at the estuary mouth has little *** explore the physical mechanism of this phenomenon,a two-dimensional model is used to establish the relationship between sediment load and the sediment budget of channels based on the bathymetry in *** results show that the tidal reach and the inner estuary have a negative sediment *** the seasonal characteristics of water and sediment fluxes become less obvious *** analysis shows that the influence of upstream sediment load on deposition flux decreases along the channel,with a transition from deposition to erosion occurring in the tidal *** the last-level bifurcation,the annual siltation of sediment in the North Passage(NP)decreases by 4.5%with low *** is attributed to the reduction of sediment load partially mitigated by riverbed erosion and cascade *** addition,the lateral sediment supply,which accounts for 68%of the sediment input in the NP,is ***,this study strengthens the understanding of the relationship between sediment load and artificially deepened systems,thus allowing for better management of estuarine sediment and navigation channel.

关键词： delta navigation channel sediment load erosion and deposition sediment budget Yangtze Estuary

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State reconstruction of molecular spatial rotation

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Chinese Physics B 2012年第2期21卷 81-87页

作者： qin Xiao Gao Jun-yi Wuhan Institute of Physics and Mathematics Chinese Academy of SciencesWuhan 430071China Graduate University of the Chinese Academy of Sciences Beijing 100049China

We establish a reconstruction approach for the rotational quantum state of linear molecules possessing a magnetic manifold. Our approximate method contains an iteration with generalized matrix inverses, processing the tomographic integral of the time-dependent molecular-axis distribution in a polar angle. As shown in a simulated example for an alignment state, the density matrix is determined in a high fidelity. An analytic tomographic formula is also derived for the symmetric top rotation. The state coherent in the quantum space of both the angular momentum and its magnetic projection can be approximately retrieved from the observable time-resolved solid-angle distribution of the molecular axis.

关键词： state reconstruction molecular rotation

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Nucleotide Variation in the NCED3 Region of Arabidopsis thaliana and its Association Study with Abscisic Acid Content under Drought Stress

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Journal of Integrative Plant Biology 2009年第2期51卷 175-183页

作者： Gang-Ping Hao Xiu-Hai Zhang Yong-qin Wang Zhong-yi Wu Cong-Lin huang Beijing Agro-Biotechnology Research Center Beijing Academy of Agriculture and Forestry Sciences Beijing 100097 China Taishan Medical College Taian 271000 China

Drought tolerance is a comprehensive quantitative trait that is being understood further at the molecular genetic level. Abscisic acid （ABA） is the main drought-induced hormone that regulates the expression of many genes related to drought responses. 9-cis-epoxycarotenoid dioxygenase （NCED3） is thought to be a key enzyme in ABA biosynthesis. In this paper, we measured the ABA content increase under drought stress, and sequenced and compared the sequence of AtNCED3 among 22 Arabidopsis thaliana accessions. The results showed that the fold of ABA content increase under drought stress was highly variable among these accessions. High density single nucleotide polymorphism （SNP） and insertion/deletion （indel） were found in the AtNCED3 region, on average one SNP per 87.4 bp and one indel per 502 bp. Nucleotide diversity was significantly lower in the coding region than that in non-coding regions. The results of an association study with ANOVA analysis suggested that the 274th site （P←→S） and the 327th site （P←→R） amino acid variations might be the cause of ABA content increase of 163av accession under drought stress.

关键词： abscisic acid Arabidopsis thaliana association study drought stress NCED3 region nucleotide variation.

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Microwave assisted hydrothermal synthesis of tin niobates nanosheets with high cycle stability as lithium-ion battery anodes

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Chinese Chemical Letters 2019年第3期30卷 771-774页

作者： Xingang Kong Jiarui Zhang Jianfeng huang Jiayin Li yi qin Ting Zhao Qi Feng School of Materials Science and Engineering Shaanxi University of Science and technology Department of Advanced Materials Science Faculty of Engineering Kagawa University

In this study, SnNb_2O_6 and Sn_2Nb_2O_7 nanosheets are synthetized via microwave assisted hydrothermal method, and innovatively employed as anode materials for lithium-ion battery. The SnNb_2O_6 electrode exhibits high reversible capacity and excellent cycling stability(498 mAh/g at 0.1 A/g after 100 cycles),which is superior to that of Sn_2Nb_2O_7 electrode(173 mAh/g at 0.1 A/g after 100 cycles). Even increasing the current density to 2.0 A/g, the SnNb_2O_6 electrode still delivers a reversible capacity up to 306 mAh/*** rate performance of the SnNb_2O_6 electrode is also better than that of Sn_2 Nb_2O_7 electrode at different current densities from 0.1 A/g to 2.0 A/g. The enhanced electrochemical performance of SnNb_2O_6 nanosheets can be attributed to the unique layered structure, which is conducive to the diffusion of the lithium ions and the migration of electrons during discharge/charge.

关键词： Tin niobates nanosheets Microwave assisted hydrothermal Anode materials Lithium ion batteries Layered structure

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