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Preparation of nano-sized Bi2Te3 thermoelectric material powders by cryogenic grinding

Progress in Natural Science:Materials International 2012年第3期22卷 201-206页

作者： Xiaozong chen a, Leifeng Liu b, Yuan Dong a, Lianjun Wang a, Lidong chen c, Wan Jiang a, a State Key Laboratory for Modification of chemical Fibers and Polymer Materials, Donghua University, 2999 people of North Road, Shanghai 201620, PR china b Department of Materials and Environmental chemistry, Stockholm University, SE-106 91 Stockholm, Sweden c Shanghai Institute of ceramics, chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, PR china [a] State Key Laboratory for Modification of chemical Fibers and Polymer Materials Donghua University 2999 people of North Road Shanghai 201620 PR China [b] Department of Materials and Environmental chemistry Stockholm University SE-106 91 Stockholm Sweden [c] Shanghai Institute of ceramics Chinese Academy of Sciences 1295 Dingxi Road Shanghai 200050 PR China

A novel method for rapid preparation of Bi2Te3 nano-sized powders with an average particle size of about 70 nm was developed. A starting powder mixture consisting of Bi2Te3 coarse particles of ～5 mm was ground using cryogenic grinding in the liquid nitrogen. For comparison, the conventional high-energy ball milling was used to prepare the Bi2Te3 nano-sized powders. Sintering properties of as-prepared powders was investigated by spark plasma sintering (SPS). The effects of the preparation procedure on the crystallinity, morphology and structure were examined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that Bi2Te3 was not transformed into a non-equilibrium amorphous phase or decomposed during the cryogenic grinding process, and as-prepared nano-powders possessed excellent sinterability. This technique might also be applicable to other thermoelectric materials.

关键词： Thermoelectric (TE) material cryogenic grinding Bi2Te3 Nanoparticles Two-step breaking model

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高速铁路对英国经济地理的影响——英国125/225城际铁路的案例研究

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城市规划学刊 2015年第1期 121-123页

作者： chen c L HALL P 许劼刘冰

高速铁路的到来产生了史无前例的时空效应,它对知识生成过程中的面对面接触具有潜在的帮助,但是对于更广泛的空间-经济影响仍有待讨论。本文尝试实证研究英国125/225城际铁路升级后30多年所产生的区域影响来填补这一空白。作者选择了服... 详细信息

高速铁路的到来产生了史无前例的时空效应,它对知识生成过程中的面对面接触具有潜在的帮助,但是对于更广泛的空间-经济影响仍有待讨论。本文尝试实证研究英国125/225城际铁路升级后30多年所产生的区域影响来填补这一空白。作者选择了服务于26个地方当局的大型铁路站的6条伦敦出境线路作为分析单元,通过考察高铁沿线城镇和非高铁沿线城镇之间以及这两组城镇内部的差异化影响,以理解125/225城际铁路对地方经济实

关键词：高速铁路经济地理失业率就业率铁城镇城际铁路伦敦服务行业服务部门服务业高铁站高速火车高速列车大不列颠及北爱尔兰联合王国英国知识密集型列车时刻表铁道路线铁路线路家庭可支配收入案例研究

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雷达中的微多普勒效应

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作者： (美)Victor c. chen

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The Ductile to Brittle Transition Behavior of the Modified 9cr-1Mo Steel and Its Laser Welds

The Ductile to Brittle Transition Behavior of the Modified 9...

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海峡两岸第二届工程材料研讨会

作者： H.c.Wu R.K.Shiue c.chen Department of Materials Science and Engineering Taiwan University Taipei 106 China Taiwan Department of Materials Science and Engineering Dong Hwa University Hualien 974 China Taiwan Department of Materials Science and Engineering Taiwan University Taipei 106 China Taiwan

The ductile to brittle transition temperature (DBTT) of the modified 9cr-1Mo steel and its laser welds was studied. The increase in grain size of the weld structure ascended the DBTT of the steel significantly. The transformation of retained austenite at martensite interlath boundaries into untempered and/or twinned martensite could also contribute to increased DBTTs of the steel and its welds tempered at 540℃.

关键词： modified 9cr-1Mo steel laser welding impact toughness ductile to brittle transition temperature

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Semi-solid Forming of a Damper Housing with Dendritic and Non-dendritic Al-Si-Mg Alloy

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特种铸造及有色合金 2001年第S1期21卷 160-163页

作者： chencM Yangcc chaocG

A motorcycle component of damper housing was made by semi-solid forming process. This was used to investigate the effect of microstructures of feedstock on the formability of semisolid process. The soundness and microstructures of casting parts made by dendritic and non-dendritic feedstock were investigated. Separating of liquid phase was found in the casting produced by dendritic feedstock, which might result in defects of porosity, while uniform microstructures were found in the casting produced by no...

关键词： Al-Si-Mg Alloy Semi-solid Forming Damper Housing

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Design and Analysis of the Power Drive Module for Ultrahigh Vacuum Wafer-Transfer Robot

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Journal of Energy and Power Engineering 2010年第6期4卷 55-59页

作者： H.c. chen S.M. Huang chung Shan Institute of Science and Technology Taoyuan 325 Taiwan Department of Mechanical Engineering National United University Miaoli 360 Taiwan

To meet stringent requirements in vacuum and cleanness for semiconductor manufacturing, a new power drive module for Selective compliant Assembly Robot Arm （ScARA） type robot has been developed for wafer-transfer. In order to obtain complete hermetic volume for higher vacuum and prevent leakage of hazardous gases, feedthrough motions involving transfer between the vacuum and motors are achieved by the use of metal bellows and magnetic coupling. An analysis of the coaxial-type magnetic coupling by employing the technique of current sheet model is presented. This approach is proved to be a precise and easy method. The construction of power drive module shows its advantage in maintaining ultrahigh vacuum and also enhances the efficiency for transporting the wafer, as compared with conventional design.

关键词： Power drive robot ultrahigh vacuum magnetic coupling.

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Distribution of Marine cladocerans in the coastal Waters of Southern china

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中山大学学报论丛 1995年第3期15卷 198-200页

作者： K.W.Tang Q.c.chen c.K.Wong DepartmentofZoology UniversityofHongKongSouthChinaSeaInstituteofOceanologyAcademiaSinicaGuangzhouDepartmentofZoologyUniversityofHongKong

clado***8speciesfromthefamiliesofSididaeandPodonidaearetrulymarine[1].Becauseoftheirlowdiversityandsmallpopulationsize,thebiologyand***

关键词： Distribution of Marine cladocerans in the coastal Waters of Southern china

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Zircon LA-IcPMS study and petrogenesis simulation of Dahuabei pluton in the Wulashan area,Inner Mongolia

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Progress in Natural Science:Materials International 2009年第12期19卷 1727-1737页

作者： Dapeng Li~(a,b),Yuelong chen~(a,*),Liemeng chen~c,Zhong Wang~d,Jinbao Liu~d a School of Earth Sciences and Resources,china University of Geosciences(Beijing),Beijing 100083,china b State Key Laboratory of Geological Process and Mineral Resources,china University of Geosciences,Wuhan 430074,china c State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,chinese Academy of Sciences,Guiyang 550002,china d Geological Survey Institute of Inner Mongolia,Hohhot 010010,china [a]School of Earth Sciences and Resources China University of Geosciences (Beijing) Beijing 100083 China [b]State Key Laboratory of Geological Process and Mineral Resources China University of Geosciences Wuhan 430074 China [c]State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China [d]Geological Survey Institute of Inner Mongolia Hohhot 010010 China

Dahuabei pluton in the Wulashan area,Inner Mongolia,is an alkaline and peraluminous granitic ***-IcPMS U-Pb dating of zircons indicates that this pluton crystallized at 330±10 *** pluton did not experience apparent zircon *** consistent temperatures between Zr saturation(765℃) and the average zircon-rutile Ti equilibrium(780℃),together with zircon ages and their cL images,indicated that there were no inherited zircons in this *** the simulation of the dry-system crystallization process of magma cooling at 200 MPa and 1100-709℃,the phase diagram and composition evolution tendency of different phases were *** magma reached its liquidus at 1069℃.Sanidine was the first crystallized phase;at 709℃the residual magma was less than 4%,and the range of 1069-719℃should be the most suitable approach to the real *** is shown that at least some part of the pluton underwent such isobaric equilibrium crystallization processes during its crystallization.

关键词： Dahuabei pluton Petrogenesis simulation Geochemistry Zircon LA-IcPMS

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A Study on Uptake and Localization of Merocyanine 540 (Mc540) in Murine Myeloid Leukemia cells by confocal Laser Scanning Microscopy (cLSM)

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chinese Journal of Lasers 2000年第3期9卷 35-41页

作者： J. Y. chen-1 N. H. cheung-2 S. c. chen-2, M. c. Fung-3 W. N. Leung-4 N. K. Mak- 4+ ( -1Department of Physics, Fudan University, Shanghai 200433, china -2Department of Physics, Hong Kong Baptist University, Hong Kong, china -3Department of Bi 复旦大学上海香港浸会大学香港香港大学香港

The intracellular localization of merocyanine 540 (Mc540), a photosensitizer commonly used in the photo-inactivation of leukemia cells, was studied using confocal laser scanning microscopy. It was found for the first time that Mc540 not only localized in the plasma membrane but also in the cytoplasm and the nuclear membrane of the murine myeloid leukemia M1 and WEHI 3B (JcS) cells. Exposure of Mc540 treated leukemia cells to light under conditions that could cause photobleaching did not cause the redistribution of cell-bound Mc540. Rapid localization of Mc540 in the cytoplasm was observed 5 minutes after exposure of leukemia cell to Mc540, indicating that Mc540 could promptly be internalized by these two leukemia cell lines. In contrast, localization of Mc540 was limited only to the plasma membrane of erythrocytes. These results suggest that the binding pattern of Mc540 is cell type dependent and may be related to the efficacy of photosenitization in photodynamic therapy.

关键词： merocyanine 540 confocal Laser Scanning Microscopy Myeloid Leukemia cell

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NEW SPEcIES OF DAcTYLISPA FROM cHINA (cOLEOPTERA, HISPINAE)

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昆虫学报 1964年第3期 422-427页

作者： S. H. chen & c. c. T’AN Institute of Zoology, Academia Sinica

In the present paper are described one new subgenus, twelve new species and twonew subspecies of the Hispine genus Dactylispa Weise. All type specimens are kept inthe Institute of Zoology, Academia Sinica.

关键词： IVI HISPINAE NEW SPEcIES OF DAcTYLISPA FROM cHINA cOLEOPTERA chen

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