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Fabrication of Bi(2223)/Ag Superconducting Tapes withRectangular Cross Section by Hydrostatic Extrusion

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Journal of Materials Science & Technology 1998年第4期14卷 374-376页

作者： Ma, Yanwei wang, xianjin wang, Zutang Univ Sci & Technol Beijing Dept Met Forming Beijing 100083 Peoples R China Tsing Hua Univ Beijing 100084 Peoples R China

Ag-sheathed Bi-2223 superconducting tapes with rectangular cross section were fabricated by hydrostatic extrusion. Microstructural analysis, microhardness measurement and X-ray diffraction have been carried out. The field dependence of the critical current density was investigated at 77 K. The rectangular shaped specimens show a higher density of oxide core, better grain alignment and less weak-linked microstructure compared with the traditional specimens. (Edited author abstract) 10 Refs.

关键词： Superconducting films

HOT PRESSING AND ITS DEFORMATION MECHANISM OF Ag-SHEATHED DPSCCO SUPERCONDUCTING TAPES

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中国有色金属学会会刊：英文版 1998年第1期8卷 89-92页

作者： Ma, Yanwei wang, xianjin wang, Zutang Univ of Science and Technology Beijing Beijing China

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关键词： Ag-sheathed superconducting tapes hot pressing deformation mechanismcritical current density

Strong Embeddability for Groups Acting on Metric Spaces

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Chinese Annals of Mathematics,Series B 2019年第2期40卷 199-212页

作者： Jun XIA xianjin wang College of Mathematics and Statistics Chongqing University

The strong embeddability is a notion of metric geometry, which is an intermediate property lying between coarse embeddability and property A. In this paper, the permanence properties of strong embeddability for groups acting on metric spaces are studied. The authors show that a finitely generated group acting on a finitely asymptotic dimension metric space by isometries whose K-stabilizers are strongly embeddable is strongly embeddable. Moreover, they prove that the fundamental group of a graph of groups with strongly embeddable vertex groups is also strongly embeddable.

关键词： Strong embeddability Groups action Graph of groups Relative hyperbolic groups

Permanence of Metric Sparsification Property under Finite Decomposition Complexity

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Chinese Annals of Mathematics,Series B 2014年第5期35卷 751-760页

作者： Qin wang Wenjing wang xianjin wang Research Center for Operator Algebras Department of Mathematics East China Normal University Department of Applied Mathematics Donghua University College of Mathematics and Statistics Chongqing University

The notions of metric sparsification property and finite decomposition complexity are recently introduced in metric geometry to study the coarse Novikov conjecture and the stable Borel conjecture. In this paper, it is proved that a metric space X has finite decomposition complexity with respect to metric sparsification property if and only if X itself has metric sparsification property. As a consequence, the authors obtain an alternative proof of a very recent result by Guentner, Tessera and Yu that all countable linear groups have the metric sparsification property and hence the operator norm localization property.

关键词：稀疏性复杂性分解公制财产权度量几何度量空间操作规范

Micro-aluminum powder with bi-or tri-component alloy coating as a promising catalyst:Boosting pyrolysis and combustion of ammonium perchlorate

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Defence Technology（防务技术） 2024年第3期33卷 100-113页

作者： Chao wang Ying Liu Mingze Wu Jia Li Ying Feng xianjin Ning Hong Li Ningfei wang Baolu Shi School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

A novel design of micro-aluminum(μAl)powder coated with bi-/tri-component alloy layer,such as:Ni-P and Ni-P-Cu(namely,Al@Ni-P,Al@Ni-P-Cu,respectively),as combustion catalysts,were introduced to release its huge energy inside Al-core and promote rapid pyrolysis of ammonium perchlorate(AP)at a lower temperature in aluminized *** microstructure of Al@Ni-P-Cu demonstrates that a three-layer Ni-P-Cu shell,with the thickness of~100 nm,is uniformly supported byμAl carrier(fuel unit),which has an amorphous surface with a thickness of~2.3 nm(catalytic unit).The peak temperature of AP with the addition of Al@Ni-P-Cu(3.5%)could significantly drop to 316.2℃ at high-temperature thermal decomposition,reduced by 124.3℃,in comparison to that of pure AP with 440.5℃.It illustrated that the introduction of Al@Ni-P-Cu could weaken or even eliminate the obstacle of AP pyrolysis due to its reduction of activation energy with 118.28 kJ/*** laser ignition results showed that the ignition delay time of Al@Ni-P-Cu/AP mixture with 78 ms in air is shorter than that of Al@Ni-P/AP(118 ms),decreased by 33.90%.Those astonishing breakthroughs were attributed to the synergistic effects of adequate active sites on amorphous surface and oxidation exothermic reactions(7597.7 J/g)of Al@Ni-P-Cu,resulting in accelerated mass and/or heat transfer rate to catalyze AP pyrolysis and ***,it is believed to provide an alternative Al-based combustion catalyst for propellant designer,to promote the development the propellants toward a higher energy.

关键词： Micro-aluminum powder(μAl) Nano-sized alloy coating Combustion catalyst Ammonium perchlorate Pyrolysis behavior Ignition and combustion

Remarks on the Operator Norm Localization Property

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Chinese Annals of Mathematics,Series B 2011年第4期32卷 593-604页

作者： xianjin wang Department of Applied Mathematics Donghua University Shanghai 201620 China.

The author studies the metric spaces with operator norm localization property. It is proved that the operator norm localization property is coarsely invariant and is preserved under certain infinite union. In the case... 详细信息

关键词：本地化属性算子范数备注操作规范度量空间有限生成粗糙

Regulable toehold lock for the effective control of strand displacement reaction sequence and circuit leakage

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Chinese Chemical Letters 2024年第7期35卷 372-376页

作者： Kuangdi Luo Yang Qin Xuehao Zhang Hanxu Ji Heao Zhang Jiangtian Li xianjin Xiao Xinyu wang Department of Breast Surgery Second Hospital of Jilin UniversityChangchun 130041China Institute of Reproductive Health Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Laboratory Medicine Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Pancreatic Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China School of Life Science and Technology Wuhan Polytechnic UniversityWuhan 430023China

Strand displacement reaction enables the construction of enzyme-free DNA reaction networks,thus has been widely applied to DNA circuit and *** has the characteristics of high efficiency,universality and ***,the existing regulation tools cannot enable effective control of the reaction sequence,which undoubtedly limits the construction of complex nucleic acid ***,we developed a regulation tool,toehold lock,and achieved strict control of reaction sequence without loss of the main reaction signal ***,we applied the tool to scenarios such as seesaw circuits,AND/OR logic gates,and entropy-driven circuits,and respectively demonstrated its significant superiority compared to the original *** believe that the proposed toehold lock has greatly optimized the efficiency of DNA strand displacement-based networks,and we anticipate that the tool will be widely used in multiple fields.

关键词： DNA circuit Toehold lock DNA strand displacement Reaction sequence Seesaw circuit

Toeless and reversible DNA strand displacement based on Hoogsteen-bond triplex

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Chinese Chemical Letters 2024年第5期35卷 330-337页

作者： Yang Qin Jiangtian Li Xuehao Zhang Kaixuan Wan Heao Zhang Feiyang Huang Limei wang Hongxun wang Longjie Li xianjin Xiao Institute of Reproductive Health Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Pancreatic Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Wuhan Polytechnic University Wuhan 430023China

Strand displacement reaction is a crucial component in the assembly of diverse DNA-based nanodevices,with the toehold-mediated strand displacement reaction representing the prevailing ***,the single-stranded Watson-Crick sticky region that serves as the trigger for strand displacement can also cause leakage reactions by introducing crosstalk in complex DNA ***,we proposed the toeless and reversible DNA strand displacement reaction based on the Hoogsteen-bond triplex,which is compatible with most of the existing DNA *** demonstrated that our proposed reaction can occur at pH 5 and can be reversed at pH *** also observed an approximately linear relationship between the degree of reaction and pH within the range of pH 5-6,providing the potential for precise regulation of the ***,by altering the sequence orientation,we have demonstrated that our proposed reaction can be initiated or regulated through the same toeless mechanism without the requirement for protonation in low pH *** on the proposed reaction principle,we further constructed a variety of DNA nanodevices,including two types of DNA logic gates that rely on pH 5/pH 9 changes for initiating and reversing:the AND gate and the OR *** also successfully constructed a DNA Walker based on our proposed reaction modes,which can move along a given track after the introduction of a programmable DNA sequence and complete a cycle after 4 *** findings suggest that this innovative approach will have broad utility in the development of DNA circuits,molecular sensors,and other complex biological systems.

关键词： DNA strand displacement Toeless Triplex DNA strands Reversible DNA circuit DNA walker

Property A and Uniform Embeddability of Metric Spaces Under Decompositions of Finite Depth

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Chinese Annals of Mathematics,Series B 2010年第1期31卷 21-34页

作者： Yujuan DUAN Qin wang xianjin wang Department of Applied Mathematics Donghua University Shanghai 201620 China Corresponding author. Department of Applied Mathematics Donghua University Shanghai 201620 China

Property A and uniform embeddability are notions of metric geometry which imply the coarse Baum-Connes conjecture and the Novikov *** this paper,the authors prove the permanence properties of property A and uniform em... 详细信息

关键词：度量空间模分解嵌入物业度量几何猜想