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Melting behavior of magnesium alloy chips in thixomolding process

中国有色金属学会会刊：英文版 2007年第A01期17卷 385-390页

作者：崔晓鹏刘海峰刘勇兵 Institute of Materials Science and Engineering Changchun University of Technology R&D Centre Foundry CorporationFAW Group Corporation Key Laboratory of Automobile Material Ministry of EducationJilin University

The samples were fabricated by 220 t thixomolded machine made by Japan Steel Works. The microstructure from the AZ91d magnesium alloy chips to the thixomolded products was investigated. Melting behavior of the chips in thixomolding process was analyzed. The evolution processing of solid phase morphology was studied,and evolution model was put forward. The results show that microstructures in outer zone of a chip and the inner zone are obviously different,and the severe distortion takes place in the brim of the chip,where the grains are observed to be bent,distorted,even broken. The severe plastic deformation region is firstly molten,then segregation area in the inner of the chip continues to melt. The liquid phase in solid phase does not formed by liquid entrapped during shearing process,but primarily induced by internal composition segregation.

关键词：镁合金熔炼特性机械性能磁性材料

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TEM Investigation of Micro/nano-structures and Hydrogen Storage Properties of Mg/Cu Super-laminates and Mg2Cu Powder

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Microscopy and Microanalysis 2007年第S2期13卷 1098-1099页

作者： K Tanaka N Takeichi H Tanaka N Kuriyama T Ueda M Tsukahara H Miyamura S Kikuchi National Institute of Advanced Industrial Science and Technology Japan IMRA Material R&D Co Ltd Japan University of Shiga Prefecture Japan

Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007

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Study on Inter-Base Station Link Capacity Sharing using Cognitive radio Communication

Study on Inter-Base Station Link Capacity Sharing using Cogn...

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IEEE International Symposium on Personal, Indoor and Mobile radio Communications (PIMrC)

作者： Kanshiro Kashiki Mitsuo Nohara Satoshi Imata Hiroyuki Nakamura KDDI R&D Laboratories Technology Development Center Chiyoda Tokyo Japan Media Technology Department KDDI Chiyoda Tokyo Japan

This paper describes a study on beam switching scheme applicable to the cognitive radio communication, from the viewpoint of the efficient use of radio frequency resource, as a function of the response time of Web browsing. The beam switching is time division scheme of the assigned frequency bandwidth among one wireless link and another links. regarding the radio network, we consider three types of topology. As a result of software simulations, we conclude that the radio beam switching have the better performance in frequency use, comparing with the case of the conventional fixed frequency allocation. Furthermore, we simulate the IP throughput characteristics and response time characteristics of Web browsing in the radio link affected by transmission error.

关键词： Cognitive radio Communication switching delay radio spectrum management radio frequency Frequency conversion Bandwidth radio network Network topology Software performance

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Capillary electrophoretic studies on photogenotoxic potential of pharmaceutical substances

Capillary electrophoretic studies on photogenotoxic potentia...

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daLian Internationall Symposia and Exhibition on Chromatography (大连国际色谱学术报告会(第30届国际毛细管色谱学术报告会、第4届全二维气相色谱学术报告会、第16届全国色谱学术报告会))

作者： Onoue, S Igarashi, N Kitagawa, F Otsuka, K Tsuda, Y Analytical R&D Pfizer Global Research and Development Nagoya Laboratories Pfizer Japan Inc.5-2 Ta Department of Material Chemistry Graduate School of Engineering Kyoto University Katsura Nishiky

Phototoxic skin responses, including photoirritation, photoallergy, and photogenotoxicity, to systemically or topically administered drugs are frequently reported as adverse drug *** experimental and epidemiological evidence points to the involvement of reactive oxygen species (rOS) and free radicals in the phototoxic skin ***, we suggested that the determination of rOS, generated from the photoirradiated compounds, would be useful to evaluate the photoreactivity of pharmaceutical substances.

关键词： Capillary Electrophoresis pBr322 dNA Phototoxicity Photogenotoxicity

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Smallest Bit-Line Contact of 76nm pitch on NANd Flash Cell by using reversal Pr (Photo resist) and SAdP (Self-Align double Patterning) Process

Smallest Bit-Line Contact of 76nm pitch on NAND Flash Cell b...

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IEEE/SEMI Conference and Workshop on Advanced Semiconductor Manufacturing

作者： Byungjoon Hwang Jaehwang Shim Jang-Ho Park Kwangseok Lee Sunghyun Kwon Sang-Yong Park Yoonmoon Park dong-Hwa Kwak Jaekwan Park Won-Seong Lee Advanced Technology Development Team Semiconductor R&D Center Memory Business Samsung Electro Mechanics Company Limited Yongin si Kyunggi South Korea

For the scaling down of design rule to develop the high density NANd flash device, the reduced active area forces to form a small bit-line contact with the low contact-resistance, as well as the low junction leakage current due to the borderless contact. In this paper, we propose a novel process to make 38 nm small size contact with 76 nm pitch by using the reversal Pr (photo resist) and SAdP (self-align double patterning) process. The methods to minimize the contact resistance and to suppress the junction leakage current were explained on NANd flash device with 38 nm node technology.

关键词： resists Etching Leakage current Contact resistance Lithography Production research and development Electronic mail Fabrication Atomic layer deposition

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Capillary electrophoretic studies on photogenotoxic potential of pharmaceutical substances

Capillary electrophoretic studies on photogenotoxic potentia...

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30th International Symposium on Capillary Chromatography、4th GC×GC Symposium、16th National Symposium and Exhibition on Chromatography,i.e. 1st dalian International Symposium and Exhibition on Chromatography

作者： Onoue,S. Igarashi,N. Kitagawa,F. Otsuka,K. Tsuda,Y. Analytical R&D Pfizer Global Research and Development Nagoya Laboratories Pfizer Japan Inc.5-2 Taketoyo Aichi 470-2393 Japan Analytical R&D Pfizer Global Research and Development Nagoya Laboratories Pfizer Japan Inc.5-2 Taketoyo Aichi 470-2393 Japan Analytical R&D Pfizer Global Research and Development Nagoya Laboratories Pfizer Japan Inc.5-2 Taketoyo Aichi 470-2393 Japan Department of Material Chemistry Graduate School of Engineering Kyoto University Katsura Nishikyo-ku Kyoto 615-8510 Japan Analytical R&D Pfizer Global Research and Development Nagoya Laboratories Pfizer Japan Inc.5-2 Taketoyo Aichi 470-2393 Japan

Phototoxic skin responses,including photoirritation,photoallergy,and photogenotoxicity,to systemically or topically administered drugs are frequently reported as adverse drug *** experimental and epidemiological evidence points to the involvement of reactive oxygen species(rOS)and free radicals in the phototoxic skin ***,we suggested that the determination of rOS,generated from the photoirradiated compounds,would be useful to evaluate the photoreactivity of pharmaceutical substances.

关键词： Capillary Electrophoresis pBr322 dNA Phototoxicity Photogenotoxicity

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Synthesizing realistic Vehicular Mobility for More Precise Simulation of Inter-vehicle Communication

Synthesizing Realistic Vehicular Mobility for More Precise S...

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IEEE Globecom Workshops

作者： Kazuhiro Nakanishi Takaaki Umedu Teruo Higashino Hironobu Kitaoka Hiroko Mori Graduate School of Information Science and Technology Osaka University Graduate School of Information Science and Technology Osaka University Japan Toyota Central Research and Development Laboratories Inc. Japan Toyota Central R&D Labs

recently many researches about transmission of traffic information among vehicles by using inter-vehicle communication without any load side infrastructures have been studied. In order to evaluate performance of such inter-vehicle communication, traffic simulators are widely used. However, in most of existing traffic simulators, distance between two following vehicles is modeled as equals based on statistical flow rates. Such mobility models do not reflect real performance of inter-vehicle communication, In this paper, we extract particular characteristics of real vehicular mobility from several traces of vehicular movement, formulate them formally, implement the formulated realistic vehicular mobility on an existing traffic simulator and obtain more real performance of inter-vehicle communication. In the extracted vehicular mobility, each vehicle runs at a different speed, with different distance from the vehicle ahead, and with different vehicular density/distribution while the bottleneck capacity and saturation flow rate of the target roads are preserved as the same as those on the original one. We have shown that performance of inter-vehicle communication is rather different between the proposed mobility and original mobility by evaluating the reachable hop counts of multi-hop communication and performance of the dSr protocol.

关键词： Traffic control road vehicles Telecommunication traffic Spread spectrum communication Mobile communication Protocols Ad hoc networks research and development Predictive models Microscopy

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The pupil as a possible premonitor of drowsiness

The pupil as a possible premonitor of drowsiness

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Junpei Nishiyama Koji Tanida Masashi Kusumi Yutaka Hirata Department of Computer Science Chubu University College of Engineering Kasugai Japan researchers Honda R&D Co. Ltd. Automobile R&D Center Department 4 Technology Research Division 2. e-mail: Koji_Tanida@n.t.rd.honda.co.jp Automobile Research and Development Center Department Technology Research Division Japan

Prediction of drowsiness based on an objective measure is demanded in machine and vehicle operations in which human errors may cause fatal accidents. Currently we focused on the pupil of the eye which is controlled by the autonomic nervous system, and easily observable non-invasively from the outside of the body. We employed uneventful driving simulation to induce drowsiness of human subjects, and an anti-saccade task to evaluate their cognitive and motor performance. First we confirmed that pupil diameter fluctuates with large amplitude at low frequencies when the subject is aware of his/her drowsiness as reported previously. during this period, the latency of anti-saccade initiation was elongated and varied. We then found that prior to this fluctuation, pupil diameter decreases gradually in most subjects, and they were not aware of sleepiness during this period. We conclude that this monotonic gradual miosis can be a reliable premonitor of drowsiness.

关键词： Humans Vehicles Autonomic nervous system Frequency Fluctuations Signal design Computer science Automotive engineering research and development Accidents

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Formation of Core-Shell Structure of BaTiO3 Grains in MLCC

Formation of Core-Shell Structure of BaTiO3 Grains in MLCC

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Chang-Hoon Kim Kum-Jin Park Yeo-Joo Yoon Jeong-Oh Hong dong-Sook Sinn Kang-Heon Hur Material Development Group LCR Division Samsung Electro Mechanics Company Limited Suwon South Korea Analytical Research Group Central R&D Institute Samsung Electro Mechanics Company Limited Suwon South Korea LCR Development Team LCR Division Samsung Electro Mechanics Company Limited Suwon South Korea

To understand the formation of core-shell structure in BaTiO 3 (BT) grains in multilayer ceramic capacitors, specimens were prepared with BT powders mixed with Y and Mg, and their microstructures were investigated in terms of scanning electron microscopy, x-ray diffractometry, and transmission electron microscopy. Compared to BT without Y and Mg, the addition of additives inhibited growth of the BT grains. Microstructural investigation showed that Y dissolved easily in BT lattice to a certain depth inside of the grain whereas Mg tended to stay at grain boundaries rather than to be incorporated into BT. It was considered that in case of Y and Mg addition in a proper ratio, Y could play a dominant role in the formation of shell leading to a slight dissolution of Mg in the shell. Next, the effects of ball-milling condition on the core-shell formation were studied. As the ball-milling period increased, the milled powders did not show a significant change in size distribution but an increase of residual strain which was attributed to the milling damage. The increase in milling damage facilitated the shell formation leading to the increased shell portion in the core-shell grain and, in turn, the deteriorating dielectric property.

关键词： Powders Scanning electron microscopy Transmission electron microscopy Milling Nonhomogeneous media Ceramics Capacitors Microstructure X-ray diffraction Lattices

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Sintering Condition of Cordierite for Microwave/Millimeterwave dielectrics

Sintering Condition of Cordierite for Microwave/Millimeterwa...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Hitoshi Ohsato Mio Terada Isao Kagomiya Keizou Kawamura Ken-ichi Kakimoto Materials Science and Engineering Shikumi-College Nagoya Institute of Technology Nagoya Japan Materials Science and Engineering Nagoya Institute of Technology Shikumi College Nagoya Japan Materials Research & Development Division General R&D Laboratories Taiyo Yuden Company Limited Gunma Japan

With advent of ubiquitous age, the high quality dielectric materials have been required for the wireless communications available to the millimeterwave as well as microwave frequencies. These high frequencies would be expected for ultra high speed LAN, ETS and car anti-collision system on the intelligent transport system (ITS) and so on. Silicates are good candidate for microwave/millimeterwave dielectrics, because of their low dielectric constant. Cordierite (Mg 2 Al 4 Si 5 O 18 ) is one of the silicates with low dielectric constant (epsiv r ), which are expected for good candidate of millimeterwave dielectrics. This study has been focused on the sintering condition of cordierite: the lowest calcined temperature of 1355degC among 1355 to 1375degC brings a single phase, the highest sintering temperature of 1440degC among 1375 to 1440degC brings a single phase. At 1440degC, the highest density of 2.48 g/cm 3 was obtained. dielectric constant was depended on the sintering temperatures, and the density was also was improved by the cooling rate from sintering temperature. The microwave dielectric properties are as follows: epsiv r = 6.14, Qldrf= 59682 GHz and tau r = -26.1 ppm/degC.

关键词： dielectric constant Frequency Temperature dependence Powders materials science and technology dielectric materials Wireless communication Cooling dielectric losses delay effects

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