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Superconductivity in CuO_2 monolayer on cuprate substrates

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Science Bulletin 2016年第16期61卷 1236-1238页

作者： Fu-chun zhang Department of Physics Zhejiang University Hangzhou 310027 China

High transition temperatureeTcTsuperconductivity in cuprates remains to be one of the most challenging topics in condensed matter physics[1–5].Despite worldwide efforts in the past 30 years since its

关键词：高温超导 CuO2 铜基导电平面凝聚态物理转变温度层状结构铜氧化物

The role of innate immunity in diabetic nephropathy and their therapeutic consequences

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Journal of Pharmaceutical Analysis 2024年第1期14卷 39-51页

作者： Min Yang chun zhang Department of Nephrology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China

Diabetic nephropathy (DN) is an enduring condition that leads to inflammation and affects a substantial number of individuals with diabetes worldwide. A gradual reduction in glomerular filtration and emergence of proteins in the urine are typical aspects of DN, ultimately resulting in renal failure. Mounting evidence suggests that immunological and inflammatory factors are crucial for the development of DN. Therefore, the activation of innate immunity by resident renal and immune cells is critical for initiating and perpetuating inflammation. Toll-like receptors (TLRs) are an important group of receptors that identify patterns and activate immune responses and inflammation. Meanwhile, inflammatory responses in the liver, pancreatic islets, and kidneys involve inflammasomes and chemokines that generate pro-inflammatory cytokines. Moreover, the activation of the complement cascade can be triggered by glycated proteins. This review highlights recent findings elucidating how the innate immune system contributes to tissue fibrosis and organ dysfunction, ultimately leading to renal failure. This review also discusses innovative approaches that can be utilized to modulate the innate immune responses in DN for therapeutic purposes.

关键词： Innate immunity Diabetic nephropathy Inflammation Toll-like receptor Inflammasomes

THREE-DIMENSIONAL ANALYSIS OF FUNCTIONALLY GRADED PLATE BASED ON THE HAAR WAVELET METHOD

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Acta Mechanica Solida Sinica 2007年第2期20卷 95-102页

作者： zhang chun Zhong Zheng School of Aerospace Engineering and Applied mechanics Tongji University Shanghai 200092 China School of Civil Engineering and Architecture Nanchang University Nanchang 330031 China

A three-dimensional analysis of a simply-supported functionally graded rectangular plate with an arbitrary distribution of material properties is made using a simple and effective method based on the Haar wavelet. With good features in treating singularities, Haar series solution converges rapidly for arbitrary distributions, especially for the case where the material properties change rapidly in some regions. Through numerical examples the influences of the ratio of material constants on the top and bottom surfaces and different material gradient distributions on the structural response of the plate to mechanical stimuli are studied.

关键词： functionally graded material rectangular plate Haar wavelet three-dimensional analysis

Boundedness of oscillatory singular integral with rough kernels on Triebel-Lizorkin spaces

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Applied Mathematics(A Journal of Chinese Universities) 2013年第1期28卷 90-100页

作者： zhang chun-jie zhang Yan-dan School of Science Hangzhou Dianzi University Department of Mathematics Zhejiang University of Science & Technology

In this paper, we will prove the Triebel-Lizorkin boundedness for some oscillatory singular integrals with the kernel （x） satisfying a condition introduced by Grafakos and Stefanov. Our theorems will be proved under various conditions on the phase function, radial and nonradial. Since the L p boundedness of these operators is not complete yet, the theorems extend many known results.

关键词： Oscillatory singular integral Triebel-Lizorkin space rough kernel phase function.

Analysis of current induced by long internal solitary waves in stratified ocean

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Acta Mechanica Sinica 2010年第5期26卷 653-660页

作者： Hui-Qin zhang Jia-chun Li Laboratory of Environmental Mechanics Institute of Mechanics Chinese Academy of SciencesBeijing 100190 China

An approximate theoretical expression for the current induced by long internal solitary waves is presented when the ocean is continuously or two-layer stratified. Particular attention is paid to characterizing velocity fields in terms of magnitude, flow components, and their temporal evolution/spatial distribution. For the two-layer case, the effects of the upper/lower layer depths and the relative layer density difference upon the induced current are further studied. The results show that the horizontal components are basically uniform in each layer with a shear at the interface. In contrast, the vertical counterparts vary monotonically in the direction of the water depth in each layer while they change sign across the interface or when the wave peak passes through. In addition, though the vertical components are generally one order of magnitude smaller than the horizontal ones, they can never be neglected in predicting the heave response of floating platforms in gravitationally neutral balance. Comparisons are made between the partial theoretical results and the observational field data. Future research directions regarding the internal wave induced flow field are also indicated.

关键词： Induced current Internal solitary waves Stratified flow Two-layer fluid Asymptotic analysis

Transition Metal Catalyzed Enantioselective Migratory Functionalization Reactions of Alkenes through Chain-Walking

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Chinese Journal of Chemistry 2022年第13期40卷 1608-1622页

作者： Min zhang Yuqi Ji chun Zzhang Institute of Molecular Plus Tianjin Key Laboratory of Molecular Optoelectronic ScienceDepartment of ChemistrySchool of ScienceTianjin UniversityWejin Rd.92Tianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

"Chain-walking"reactions could realize to modify a molecule at the position far awayfrom the active *** has been a hot topic in the research field of organic *** a number of achievements have been made by researchers,the products of transition metal-catalyzed chain-walking reactions couldbe obtained with good *** review summarized the researches on the asymmetric chain-walking reactions catalyzed by transition metal in the past *** works are classified according to the species of metal catalysts.

关键词： Chain-walking Transition-metal catalysis Enantioselectivity Regioselectivity Diastereoselectivity

Reactive oxygen species metabolism during the cadmium hyperaccumulation of a new hyperaccumulator Sedum alfredii (Crassulaceae)

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Journal of Environmental Sciences 2007年第11期19卷 1311-1317页

作者： zhang Zhong-chun QIU Bao-sheng College of Life Sciences Huazhong Normal University Wuhan 430079 China

Sedum alfredii Hance, a newly discovered hyperaccumulator, could serve as a good material for phytoremediation of Cd polluted sites. Malondialdehyde （MDA）, reactive oxygen species （ROS） and antioxidases （catalase （CAT）; superoxide dismutase （SOD）; peroxidase （POD）） in the leaf were determined when S. alfredii was treated for 15 d with various CdC12 concentrations ranging from 0 to 800 μmol/L. The results showed that the production rate of 2＇,7＇-dichlorofluorescein （DCF）, which is an indicator of ROS level, reached up to the maximum at 400 μmol/L CdCl2 and then declined with the increase of CdCl2 concentration, while MDA accumulation tended to increase. CAT activity was significantly inhibited at all tested CdCl2 concentrations and SOD activity was sharply suppressed at 800 μmol/L CdCl2. However, the enhancement of POD activity was observed when CdCl2 concentration was higher than 400 μmol/L. In addition, its activity increased when treated with 600 μmol/L CdCl2 for more than 5 d. When sodium benzoate, a free radical scavenger, was added, S. alfredii was a little more sensitive to Cd toxicity than that exposed to Cd alone, and the Cd accumulation tended to decline with the increase of sodium benzoate concentration. It came to the conclusions that POD played an important role during Cd hyperaccumulation, and the accumulation of ROS induced by Cd treatment might be involved in Cd hyperaccumulation.

关键词： cadmium hyperaccumulation reactive oxygen species Sedum alfredii

FISSION 1A and FISSION 1 B Proteins Mediate the Fission of Peroxisomes and Mitochondria in Arabidopsis

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Molecular Plant 2008年第6期1卷 1036-1047页

作者： Xin-chun zhang Jian-Ping Hu MSU-DOE Plant Research Laboratory Michigan State University East Lansing MI 48824 USA Plant Biology Department Michigan State University East Lansing MI 48824 USA

Peroxisomes and mitochondria are metabolically diverse organelles that act in concert in a number of pathways in eukaryotes, including photorespiration and lipid mobilization in plants. The division machineries of these two types of organelles also share several components such as dynamin-related proteins （DRPs） and their organelle anchor, the FISSION1 （FIS1） protein. In Arabidopsis, members of the DRP3 and FIS1 small protein families, namely DRP3A, DRP3B, FISIA, and FISIB, are each dual-targeted to peroxisomes and mitochondria and are required for the division of both organelles; DRP3A and DRP3B are partially redundant in function. To further determine the contribution of FISIA and FISIB to the division of peroxisomes and mitochondria, we analyzed plants overexpressing FISIA or FISIB and mutants in which the functions of both proteins were disrupted. Domains in FISIA and FISIB required for peroxisomal targeting were also dissected. Our results demonstrate that FISIA and FISIB play rate-limiting and partially overlapping roles in promoting the fission of peroxisomes and mitochondria. Furthermore, although the C-terminus of FIS1 is both necessary and sufficient for targeting to peroxisomes, the role of the short C-terminal segment adjacent to the transmembrane domain may differ among diverse species in peroxisomal targeting.

关键词： peroxisomal and mitochondrial fission Arabidopsis FIS1 protein.

Numerical investigation on the drag reduction properties of a suction controlled high-rise building

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第7期11卷 477-487页

作者： Chao-rong ZHENG Yao-chun zhang School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

To reduce the wind-induced drag and improve the wind-resistance performance of a high-rise building, steady suction control is introduced into the building structure. Based on validation of the numerical methods by experiment with suction control over the flow separation of a 3D backward-facing step, the Reynolds stress equation model is used to investigate the drag reduction (DR) properties of a high-rise building whose side faces are controlled by all-height suction. Effects of the orifice geometrical parameters and suction flux parameters on the DR and the separation control are analyzed, and the detailed flow fields are shown to clarify the mechanism of suction control. The results indicate that suction control is very effective in reducing the wind loads on the high-rise building model, and only the dimensionless suction flux dominates. Lastly, the power consumed and the counterforce induced by suction are discussed, the suction models become the "zero-drag" model under certain suction angles.

关键词： High-rise building Numerical simulation Suction control Drag reduction (DR) Power Mechanism analysis