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Copper-Ti_3SiC_2 composite powder prepared by electroless plating under ultrasonic environment

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Rare Metals 2007年第4期26卷 359-364页

作者： ZHANG Zhongbao XU Shaofan school of Materials science and Engineering Hefei University of Technology Hefei 230009 China

In this article, a new type of Cu-Ti3SiC2 composite powder prepared using the electroless plating technique was introduced. The initial Ti3SiC2 particles are 11 μm in diameter on an average. The Cu plating was carried out at middle temperature （62-65℃） with the application of ultrasonic agitation. The copper deposition rate was determined by measuring the weight gain of the powder after plating. It has been found that the pretreatment of Ti3SiC2 powder is very important to obtain copper nanoparticles on the surface of Ti3SiC2 The optimum procedure before plating aimed to add activated sites and the adjustment of the traditional composition of the electroless copper plating bath could decelerate the copper deposition rate to 0.8 gm/h. X-ray diffraction （XRD） indicates that the chemical composition of the plating layer is copper. SEM images show that the surface of the Ti3SiC2 particles is successfully coated with continuous copper layer. The wetting property between the copper matrix and Ti3SiC2 can be improved so as to increase the interfacial strength.

关键词： composites electroless plating Ti3SiC2 ultrasonic interfacial strength

Photodynamic effect of Phycocyanin subunit liposomes against breast cancer

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Photodynamic effect of Phycocyanin subunit liposomes against...

Lipschitz spaces and Q_K type spaces

第十一届中国细胞生物学学术大会暨2009西安细胞生物学国际会议

作者： Huang Bei,Zuo Man-man,Guo Rui-yong,Zhou Tao school of life science,anhui university,hefei,anhui,China,230039

Phycocyanin subunit from Spirulina platensis is a novel photosensitizer because of its single absorption peak,low cell toxicity and good PDT(photodynamic therapy) effect on *** the aim of improving the tumor target of photosensitizers,liposomes are presently being used as carrier and delivery systems for *** our study,we prepared Phycocyanin subunits liposomes with PEG(PEG-PCS-LIP) and studied its photodynamic therapy effect on breast cancer cells.

关键词： Phycocyanin subunit liposome PDT breast cancer tumor target

来源： cnki会议评论

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science China Mathematics 2010年第3期53卷 771-778页

作者： LI Hao 1 , WULAN Hasi 1, & ZHOU JiZhen 1,2 1 Department of Mathematics, Shantou university, Shantou 515063, China 2 school of sciences, anhui university of science and Technology, Huainan 232001, China 1. Department of Mathematics Shantou University Shantou 515063 China2. School of Sciences Anhui University of Science and Technology Huainan 232001 China

If f(z) =Σ∞ n=0 anzn and g(z) =Σ∞n=0bnzn for functions f, g are analytic in the unit disc, the Hadamard products of f and g is defined by f * g = ∞ n=0 a n b n z n . In this paper, the Lipschitz spaces Λ(s, α) ... 详细信息

关键词： Q K type spaces Lipschitz spaces Hadamard products

Negacyclic codes over Galois rings of characteristic 2a

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science China Mathematics 2012年第4期55卷 869-879页

作者： ZHU ShiXin 1,2,& KAI XiaoShan 1,2 1 school of Mathematics,hefei university of Technology,hefei 230009,China 2 National Mobile Communications Research Laboratory,Southeast university,Nanjing 210096,China 1. school of Mathematics Hefei University of Technology Hefei 230009 China2. National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

Abstract We investigate negacyclic codes over the Galois ring GR（2a,m） of length N = 2kn, where n is odd and k≥0. We first determine the structure of u-constacyclic codes of length n over the finite chain ring GR（2a, m）[u]/〈u2k ＋ 1〉. Then using a ring isomorphism we obtain the structure of negacyclic codes over GR（2a, m） of length N = 2kn （n odd） and explore the existence of self-dual negacyclic codes over GR（2a, m）. A bound for the homogeneous distance of such negacvclic codes is also given.

关键词： negacyclic codes constacyclic codes Galois rings self-dual codes homogeneous distance

SHRIMP dating of the Bangong Lake SSZ-type ophiolite: Constraints on the closure time of ocean in the Bangong Lake-Nujiang River,northwestern Tibet

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Chinese science Bulletin 2007年第7期52卷 936-941页

作者： SHI RenDeng1,2 1 school of Earth and Space sciences, university of science and Technology of China, hefei 230026, China 2 Institute of Geology, Chinese Academy of Geological sciences, Beijing 100037, China (email: shird@***) school of Earth and Space sciences University of Science and Technology ofChina Hefei 230026 China

The Bangong Lake ophiolite is located in the westernmost part of the Bangong Lake-Nujiang River suture zone. It is a tectonic mélange consisting of numerous individual blocks of peridotite, pillowed and massive lavas and mafic dykes with SSZ-type ophiolitic geochemical affinity formed at the end of a Wilson circle. The SHRIMP U-Pb ages of the co-magmatic zircon domains from one gabbroic dyke (Sample 01Y-155) range from 162.5±8.6 Ma to 177.1±1.4 Ma with an average of 167.0±1.4 Ma (n = 12, MSWD = 1.2), suggesting that the subduction of the Bangong Lake Neo-Tethyan Ocean started before the Middle Jurassic. It is inferred that the tectonic transform from spreading to subduction of the Neo-Tethyan Ocean began before the Middle Jurassic in the Bangong Lake area.

关键词：西藏班公湖怒江缝合带古海洋闭合时期 SSZ型蛇绿岩 SHRIMP 测年

Fountainhead of Postcolonial Translation Studies and Its Controlling Ideas

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学术界 2011年第12期163卷 245-254页

作者： Zhang Xiaoman school of Foreign Studies hefei university of Technology Hefei Anhui 230009

This paper discusses the fountainhead of postcolonial translation studies,combs the theoretical source of the rise of postcolonial studies and makes a research on interference of translation in postcolonial *** that,it introduces main ideas of postcolonial translation studies and efforts translation theorists have made in this *** concludes that as a new school of translation theory,postcolonial translation studies will enjoy great promise in the future.

关键词：摘要编辑部编辑工作读者

Electron surfing acceleration in a current sheet of flares

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science China(Physics,Mechanics & Astronomy) 2009年第11期52卷 1810-1812页

作者： WANG DeYu1 & LU QuanMing2 1 Purple Mountain Observatory, Nanjing 210008, China 2 school of Earth and Space sciences, university of science and Technology of China, hefei 230026, China Purple Mountain Observatory Nanjing 210008 China school of Earth and Space sciences University of Science and Technology of China Hefei 230026 China

A model of electron acceleration in a current sheet of flares is studied by the analytical approximation solution and the test particle simulation. The electron can be trapped in a potential of propagating electrostatic wave. The trapped electron moving with the phase velocity v p of wave may be effectively accelerated by ev p/c × B z force along the outflow direction in the current sheet, if a criterion condition K > 0 for electron surfing acceleration is satisfied. The electron will be accelerated continuously until the electron de-trap from the wave potential at the turning point S.

关键词： electron acceleration electrostatic wave current sheet

Performance analysis of network coding for multicast relay system over Nakagami-m fading channels

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science China(Information sciences) 2011年第11期54卷 2338-2348页

作者： ZHAO Rui 1,YANG LvXi 2 & HUANG YongMing 2 1 school of Information science and Engineering,Huaqiao university,Xiamen 361021,China 2 school of Information science and Engineering,Southeast university,Nanjing 210096,China 1. school of Information science and Engineering Huaqiao University Xiamen 361021 China2. School of Information Science and Engineering Southeast University Nanjing 210096 China

The outage probability performance of network coding for multicast relay system is analyzed in Nakagami-m fading *** transmission strategies,i.e.,complex field network coding (CFNC) and amplify-and-forward network coding (AFNC),are applied in the system,and the approximate expressions of outage probability are derived at high SNR and the conclusion is reached that the system diversity gains of two transmission strategies are both 2m,as is verified by numerical *** results also show that CFNC can outperform both AFNC and direct transmission without relay in the performances of system outage probability,sum rate and symbol error ratio.

关键词： multicast relay system network coding outage probability diversity gain

The double reflection on the interface of uniaxial crystals in the Savart polariscope

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science China(Physics,Mechanics & Astronomy) 2009年第7期52卷 1003-1006页

作者： WU JunFang1,2 & ZHANG ChunMin1 1 school of science, Xi’an Jiaotong university, Xi’an 710049, China 2 school of science, Xi’an Polytechnic university, Xi’an 710048, China school of science Xi’an Jiaotong University Xi’an 710049 China school of science Xi’an Polytechnic University Xi’an 710048 China

The reflection in the Savart polariscope is different from the isotropic medium. The double reflection of rays in the Savart polariscope is analyzed and discussed on the basis of the Snell law. The double reflection formulae of the extraordinary ray and the ordinary ray are given. These results may provide a theoretical and practical guide for studying, developing and engineering polarization interference imaging spectrometers.

关键词： the Savart polariscope double reflection the Snell law extraordinary ray ordinary ray