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Effect of VFe addition on hydrogen storage behavior of TiMn_(1.5)-based alloys

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Journal of University of Science and technology Beijing 2004年第3期11卷 263-267页

作者： Xuebin Yu Zhu Wu Baojia Xia Taizhong Huang Jinzhou Chen Naixin Xu Lab of Energy Science and technology, shanghai institute of microsystem and information technology, chinese academy of sciences, shanghai 2.0050, china Lab. of Energy Sci. and Technol. Shanghai Inst. of Microsystem Chinese Acad. of Sci. Shanghai 200050 China

The hydrogen absorption and desorption behavior of TiMn_(1.25)Cr_(0.25)alloys with VFe substitution for partial Mn was investigated at 273, 293 and 313 K. It is found thatVFe substitution increases their hydrogen storage capacity, decreases the plateau pressure and thehysteresis factor of their pressure-composition-temperature (PCT) curves. After annealing treatmentat 1223 K for 6 h, TiMn_(0.95)Cr_(0.25)(VFe)_(0.3) alloy exhibits a lower hydrogen desorptionplateau pressure (0.27 MPa at 313 K) and a smaller hysteresis factor (0.13 at 313 K); the maximumand effective hydrogen storage capacities (mass fraction) are 2.03% and 1.12% respectively, whichcan satisfy the demand of hydrogen storage tanks for proton exchange membrane fuel cells (PEMFC).

关键词： TiMn-based alloy hydrogen storage capacity hysteresis sloping factor PEMFC

Channel characterization at 120 GHz for future indoor communication systems

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chinese Physics B 2013年第5期22卷 650-656页

作者：陈镇曹俊诚 Key Laboratory of Terahertz Solid-State technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences

We present a simulation on the spatial and temporal characteristics of the indoor propagation channel at 120 GHz. The simulation, applied to a dynamic scenario with randomly placed objects and moving people in a room, is based on a three-dimensional ray-tracing method. Propagation and reflection mechanisms of electromagnetic waves are discussed in the channel model. The received power in a 0.95-m-height plane is obtained. Comparison between walls and ceiling covered with dielectric mirrors and those with three common wall and ceiling materials are presented. The result shows that the holistic received power level with dielectric mirrors is about 10 dB higher than with other materials.

关键词： sub-terahertz communication channel models ray tracing electromagnetic propagation

Suppressed Antiferromagnetism and Superconductivity in As-deficient Iron-based Superconductor of SrFe_(1.8)Co_(0.2)As_x

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稀有金属材料与工程 2011年第S3期40卷 358-361页

作者： Liu Zhiyong1, Lu Yuming1, Liu Jinlei1, Qu Chunqing1,2,3, Chen Changzhao1, Cai Chuanbing1, Huang Fuqiang3, Xie Xiaoming2 1 shanghai University, shanghai 200444, china 2 State Key Laboratory of Functional Materials for Informatics,shanghai institute of microsystem and information technology,chinese academy of sciences,shanghai 2.0050, china 3 shanghai institute of Ceramics, chinese academy of sciences, shanghai 2.0050, china shanghai Univ Res Ctr Superconductors & Appl Technol Shanghai 200444 Peoples R China chinese Acad Sci Shanghai Inst Microsyst & Informat Technol State Key Lab Funct Mat Informat Shanghai 200050 Peoples R China chinese Acad Sci Shanghai Inst Ceram Shanghai 200050 Peoples R China

Iron-based superconductors namely Sr(Fe1.8Co0.2)As1.8 (FeAs1.8) and Sr(Fe1.8Co0.2)As1.85 (FeAs1.85) with As deficiency are prepared by solid-state reaction. X-ray diffraction reveals that the polycrystalline phase forms in the studied samples, identical to typical SrFe2As2 (122) matrix. Resistive and magnetic measurements show that the superconducting transition temperatures (Tc) are about 19 K for both FeAs1.8 and FeAs1.85. Compared with the performances of typical iron-based 122 superconductors arising from Co doping, the present samples show the suppressed superconductivity. Moreover, the antiferromagnetic (AFM) phase correlated with spin-density-wave (SDW) is reduced as well. The AFM transition temperature decreases to 122 K for FeAs1.85, while such a phase transition is absent at all for FeAs1.8, one sample with less As, implying that the existence of SDW and antiferromagnetism is more sensitive to As content.

关键词： antiferromagnetism superconductivity iron-based superconductors

Cytotoxicity of carbon nanotubes

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Science china Chemistry 2008年第11期51卷 1021-1029页

作者： ZHU Ying1,2 & LI WenXin1 1 Laboratory of Nano-biology and Medicine, shanghai institute of Applied Physics, chinese academy of sciences, shanghai 201800, china 2 Graduate School of chinese academy of sciences, Beijing 100049, china 1. Laboratory of Nano-biology and Medicine Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China 2. Graduate School of chinese academy of sciences Beijing 100049 China

With large-scale production and application at large scale, carbon nanotubes (CNTs) may cause ad-verse response to the environment and human health. Thus, study on bio-effects and safety of CNTs has attracted great attention from scientists and governments worldwide. This report briefly summa-rizes the main results from the in vitro toxicity study of CNTs. The emphasis is placed on the descrip-tion of a variety of factors affecting CNTs cytotoxicity, including species of CNTs, impurities contained, lengths of CNTs, aspect ratios, chemical modification, and assaying methods of cytotoxicity. However, experimental information obtained thus far on CNTs' cytotoxicity is lacking in comparability, and some-times there is controversy about it. In order to assess more accurately the potential risks of CNTs to human health, we suggest that care should be taken for issues such as chemical modification and quantitative characterization of CNTs in cytotoxicity assessment. More importantly, studies on physical and chemical mechanisms of CNTs' cytotoxicity should be strengthened; assaying methods and evaluating criteria characterized by nanotoxicology should be gradually established.

关键词： carbon nanotubes (CNTs) cell bio-security

Tunneling conductance in graphene ferromagnet/p wave superconductor junctions

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Science china(Physics,Mechanics & Astronomy) 2012年第4期Mechanics & Astronomy) .卷 649-653页

作者： LI XiaoWei 1,2*,CHEN HuaBao 1 & LIU ShuJing 1 1 School of Physics and Electronic Electrical Engineering,Huaiyin Normal University,Huaian 223300,china 2 State Key Laboratory of Functional Materials for Informatics,shanghai institute of microsystem and information technology,chinese academy of sciences,shanghai 2.0050,china 1. School of Physics and Electronic Electrical Engineering Huaiyin Normal University Huaian 223300 China2. State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

Using the extended Blonder-Tinkham-Klapwijk formalism,we investigate the conductance spectra of graphene ferromagnet/p wave superconductor *** is found that the conductance spectra are affected by the p wave pairing *** ferromagnetic exchange energy in the ferromagnet can suppress Andreev retroreflection but enhance the specular Andreev reflection in graphene ferromagnet/p wave superconductor *** conductance decreases with increasing exchange energy Eh for EhEF.

关键词： graphene ferromagnet p wave superconductor tunneling conductance

Fabrication of thick BOX SOI by Smart-cut technology

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Nuclear Science and Techniques 2003年第2期14卷 115-118页

作者： WU Yan-Jun, ZHANG Miao, AN Zheng-Hua, LIN Cheng-Lu(State Key Laboratory of Functional Materials for Informatics, shanghai institute of microsystem and information technology,the chinese academy of sciences, shanghai 2.0050) shanghai institute of microsystem and information technology the Chinese Academy of Sciences State Key Laboratory of Functional Materials for Informatics 上海 200050

A SOI material with thick BOX (2.2 μm) was successfully fabricated using the Smart-cut technology. The thick BOX SOI microstructures were investigated by high resolution cross-sectional transmission electron microscopy (XTEM), while the electrical properties were studied by the spreading resistance profile (SRP). Experimental results demonstrate that both structural and electrical properties of the SOI structure are very good.

关键词：灵活切割技术微观结构截面透射电子显微镜 XTEM 电学特性绝缘硅片 SOI

Rational redesign of inhibitors of furin/kexin processing proteases by electrostatic mutations

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Acta Pharmacologica Sinica 2004年第12期25卷 146-152页

作者： Xiao-hui CAI, Qing ZHANG, Da-fu DING2 Key Laboratory of Proteomics, institute of Biochemistry and Cell Biology, shanghai institutes for Biological sciences, chinese academy of sciences, Graduate School of the chinese academy of sciences, shanghai 200031, china Key Laboratory of Proteomics Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences Shanghai 200031 China

AIM: To model the three-dimensional structure and investigatethe interaction mechanism ofthe proprotein convertase furin/kexin and their inhibitors (eglin c mutants). METHODS: The three-dimensional complex structures of furin/ kexin with its inhibitors, eglin c mutants, were generated by modeller program using the newly published X-ray crystallographical structures of mouse furin and yeast kexin as templates. The electrostatic interaction energy of each complex was calculated and the results were compared with the experimentally determined inhibition con- stants to find the correlation between them. RESULTS: High quality models of furin/kexin-eglin c mutants were obtained and used for calculation of the electrostatic interaction energies between the proteases and their inhibitors. The calculated electrostaticenergies of interaction showeda linear correlation to the experimental inhibition constants. CONCLUSION: The modeled structures give good explanations of the specificity of eglin c mutants to furin/ kexin. The electrostatic interactions play important roles in inhibitory activity of eglin c mutants to furin/kexin. The results presented here provided quantitative structural and functional information concerning the role of the charge- charge interactions in the binding of furin/kexin and their inhibitors.

关键词： furin kexin eglin c drug design electrostatic mutation

Channel-aware and queue-aware joint-layer resource optimization for cognitive radio networks

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Science china(information sciences) 2010年第12期53卷 2576-2583页

作者： GUO KunQi 1,2,SUN LiXin 1,LI Yong 2 & JIA ShiLou 3 1 School of Computer Science and Telecommunication Engineering,Jiangsu University,Zhenjiang 212013,china 2 Research Center for Wireless Communication,shanghai institute of microsystem and information technology,chinese academy of sciences,shanghai 2.0050,china 3 Communication Research Center,Harbin institute of technology,Harbin 150001,china 1. School of Computer Science and Telecommunication Engineering Jiangsu University Zhenjiang 212013 China2. Research Center for Wireless Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China3. Communication Research Center Harbin Institute of Technology Harbin 150001 China

An optimization model is derived to maximize the utilization efficiency of the idle channels of primary users(PU) in cognitive radio *** the optimization model,Lyapunov optimization method is used to allocate the idle channels of PU to secondary user(SU) most *** time distribution of the idle channels of PU is predicted by a low-pass time *** algorithm is proposed to implement the optimization *** algorithm is efficient because of using a greedy selection *** efficiency of the algorithm is demonstrated by mathematic analyses and simulation results.

关键词： cognitive radio networks Lyapunov optimization resource utilization primary user secondary user

Anticoagulation property and security of artificial heart valve material

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Science china(Technological sciences) 2005年第2期48卷 145-162页

作者： WANG Xianghui1, , LIU Xianghuai1,22, 3, ZHANG Feng2, LI Changrong2, YU Liujiang2, ZHENG Zhihong2, WANG Xi2, JIANG Zhenbin4, CHEN Anqing4 & XU Jingfang3 1. Department of Physics, East china Normal University, shanghai 200062, china 2. Ion Beam Lab, shanghai institute of Mini-system and information, chinese academy of sciences,shanghai 2.0050, china 3. Department of Electronics, School of information Science and technology, East china Normal Univer- sity, shanghai 200062, china 4. shanghai Cardiovascular institute, Zhongshan Hospital, shanghai 200032, china 1. Department of Physics East China Normal University 200062 Shanghai China 2. Ion Beam Lab Shanghai Institute of Mini-system and information Chinese Academy of Sciences 200050 Shanghai China 3. Department of Electronics School of Information Science and Technology East China Normal University 200062 Shanghai China 4. shanghai Cardiovascular institute Zhongshan Hospital 200032 Shanghai China

Heart valve diseases threaten human health. One reliable way to save lives of such patients is to replace the pathologically changed heart valves by artificial ones. Over 2 million patients have received LTI-carbon heart valve’s implantation. However, the thrombosis after the implantation is one of the difficulties that need to be solved. In order to improve the blood compatibility and security of mechanical heart valves, ion beam technology was used to modify the surface properties of the materials. The investigation results have been summarized in this paper.

关键词： artificial heart valve, ion implantation, plasma immersed ion implantation, ion beam enhanced deposition.