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Spin susceptibility and effective mass of two-dimensional electrons in MgxZn1−xO/ZnO heterostructures

Physical review B 2008年第23期78卷 233308-233308页

作者： A. Tsukazaki A. Ohtomo M. Kawasaki S. Akasaka H. Yuji K. Tamura K. Nakahara T. Tanabe A. Kamisawa T. Gokmen J. Shabani M. Shayegan Institute for Materials Research Tohoku University Sendai 980-8577 Japan WPI Advanced Institute for Materials Research Tohoku University Sendai 980-8577 Japan CREST Japan Science and Technology Agency Tokyo 102-0075 Japan Advanced Compound Semiconductors R&D Center ROHM Co. Ltd. Kyoto 615-8585 Japan Department of Electrical Engineering Princeton University Princeton New Jersey 08544 USA

We report measurements of the spin susceptibility and the electron effective mass for two-dimensional electrons confined at the interfaces of MgxZn1−xO/ZnO single heterostructures (x=0.05, 0.08, and 0.11), grown by molecular-beam epitaxy on (0001) ZnO substrates. By tuning the built-in polarization through control of the barrier composition, the electron density was systematically varied in the range of 5.6×1011–1.6×1012 cm−2, corresponding to a range of 3.1≤rs≤5.2, where rs is the average electron spacing measured in units of the effective Bohr radius. We used the coincidence technique, where crossings of the spin-split Landau levels occur at critical tilt angles of magnetic field, to evaluate the spin susceptibility. In addition, we determined the effective mass from the temperature dependence of the Shubnikov–de Haas oscillations measured at the coincidence conditions. The susceptibility and the effective mass both gradually increase with decreasing electron density, reflecting the role of electron-electron interaction.

关键词： effective mass electronic density of states exchange interactions (electron) II-VI semiconductors Landau levels magnesium compounds magnetic susceptibility semiconductor epitaxial layers semiconductor heterojunctions Shubnikov-de Haas effect two-dimensional electron gas wide band gap semiconductors zinc compounds

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Bulk Electronic Structure of the Antiferromagnetic Superconducting Phase in ErNi2B2C

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Physical review Letters 2008年第1期100卷 017003-017003页

作者： T. Baba T. Yokoya S. Tsuda T. Kiss T. Shimojima K. Ishizaka H. Takeya K. Hirata T. Watanabe M. Nohara H. Takagi N. Nakai K. Machida T. Togashi S. Watanabe X.-Y. Wang C. T. Chen S. Shin Institute for Solid State Physics (ISSP) University of Tokyo Kashiwa Chiba 277-8581 Japan The Institute of Physical and Chemical Research (RIKEN) Sayo-gun Hyogo 679-5143 Japan The Graduate School of Natural Science and Technology Okayama University Okayama Okayama 700-8530 Japan National Institute for Material Research Tsukuba Ibaraki 305-0047 Japan Department of Physics College of Science and Technology Nihon University Chiyoda-ku Tokyo 101-8308 Japan Department of Advanced Materials Science University of Tokyo Kashiwa 277 8581 Japan Beijing Center for Crystal R&D Chinese Academy of Science Zhongguancun Beijing 100080 China

We have performed temperature- (T-)dependent laser-photoemission spectroscopy of the antiferromagnetic (AF) superconductor ErNi2B2C to study the electronic-structure evolution reflecting the interplay between antiferromagnetism and superconductivity. The spectra at the superconducting (SC) phase show a very broad spectral shape. A T-dependent SC gap shows a sudden deviation from the BCS prediction just below TN. This observation can be explained well by the theoretical model and thus represents the characteristic bulk electronic structure of the AF SC phase for the first time.

关键词： Antiferromagnetism

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High Performance Graphite ICG for a High density Anode of Lithium-ion Batteries

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ECS Meeting Abstracts 2008年第12期MA2008-02卷

作者： Hiroyuki Uono Hideharu Sato Hitoshi Matsumoto Tomiyuki Kamada Makoto Ue Kengo Okanishi Keita Yamaguchi Mitsuaki dohzono Masatake Yamamoto Kentaro Takizawa Mitsubishi Chemical Group Science and Technology Research Center Inc. Mitsubishi Chemical Corporation Mitsubishi Chemical Co. Sakaide Plant Electrode Matrials Department Tokai Carbon Co. Ltd R&D Strategy Divioson Functional Department

Abstract not Available.

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Interfacial heat transfer coefficient between metal and die during high pressure die casting process of aluminum alloy

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中国高等学校学术文摘·机械工程 2007年第3期2卷 283-287页

作者： GUO Zhipeng XIONG Shoumei CHO SangHyun CHOI JeongKil Key Laboratory for Advanced Manufacturing by Materials Processing Technology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Advanced Material R&D Center Korean Institute of Industrial Technology 994-32DongchunDong YonsuKu Inchon Republic of Korea

The present work focused on the determination of the interracial heat transfer coefficient (IHTC) between metal and die during the high pressure die casting (HPdC) *** were carried out on an aluminum alloy,AdC12Z,using'step shape'casting-so-called because of its *** IHTC was successfully determined by solving one of the inverse heat problems using the nonlinear estimation method fkrst used by *** calculation results indicated that the IHTC immediately increased after liquid metal was brought into the cavity by the plunger and decreased as the solidification process of the liquid metal *** liquid metal eventually solidified completely,a condition when the IHTC tended to be *** thickness played an important role in affecting the IHTC between the metal and die not only in terms of its value but also in terms of its change ***,under the test conditions,different change tendencies of the metal solid fraction were found between castings with different thicknesses and the die.

关键词： high pressure die casting Aluminum alloy AdC 12Z interfacial heat transfer coefficient

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Magnetotransport in low-density p−Si∕SiGe heterostructures: From metal through hopping insulator to Wigner glass

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Physical review B 2008年第8期77卷 085327-085327页

作者： I. L. drichko A. M. dyakonov I. Yu. Smirnov A. V. Suslov Y. M. Galperin V. Vinokur M. Myronov O. A. Mironov d. r. Leadley A. F. Ioffe Physico-Technical Institute Russian Academy of Sciences 194021 St. Petersburg Russia National High Magnetic Field Laboratory Tallahassee Florida 32310 USA Department of Physics and Center for Advanced Materials and Nanotechnology University of Oslo P.O. Box 1048 Blindern 0316 Oslo Norway Argonne National Laboratory 9700 S. Cass Avenue Argonne Illinois 60439 USA Musashi Institute of Technology 8-15-1 Todoroki Setagaya-ku Tokyo 158-0082 Japan Warwick SEMINANO R&D Centre University of Warwick Science Park Coventry CV4 7EZ United Kingdom Department of Physics University of Warwick Coventry CV4 7AL United Kingdom

We study dc and ac transport in low-density p−Si∕SiGe heterostructures at low temperatures and in a broad domain of magnetic fields up to 18T. Complex ac conductance is determined from simultaneous measurement of velocity and attenuation of a surface acoustic wave propagating in close vicinity of the two-dimensional hole layer. The observed behavior of dc and ac conductances is interpreted as an evolution from metallic conductance at B=0 through hopping between localized states in intermediate magnetic fields (close to the plateau of the integer quantum Hall effect corresponding to the Landau-level filling factor ν=1) to formation of the Wigner glass in the extreme quantum limit (B≳14, T≲0.8K).

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Abstracts for the 6th Congress of Asian Sleep research Society

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Sleep and Biological rhythms 2009年第4期7卷 A1-A49页

作者： Seog Ju Kim In Kyoon Lyoo Yu-Jin Lee do-Un Jeong Hirohiko Kanai Masanori Ookubo Atsushi Yoshimura Masako Okawa Noto Yamada Takeshi Munezawa Yoshitaka Kaneita Yoneatsu Osaki Hideyuki Kanda Tadahiro Ohtsu Masumi Minowa Kenji Suzuki Susumu Hijuchi Hiroyuki Suzuki Takashi Ohida Takashi Abe Yoko Komada Shoichi Asaoka Yuichi Inoue Jin-Seong Lee Sang-Yong Cho deependra Kumar Hruda N. Mallick Velayudhan M. Kumar Mahesh K. Kaushik Akihiro Karashima Noiihiro Katayama Mitsuyuki Nakao ravindra P. Nagendra Sathiamma Sulekha Sathyaprabha T. Narasappa Pradhan Nityanadan Bindu M. Kutty M. Nirmala P. N. ravindra Basavaraj ramappa Tubaki T. N. Sathyaprabha d. Sudhakar G. S. Lavekar C. r. Chandrashekar Kazuyoshi Kitaoka Mika Shimizu Sachiko Chikahisa Kazuo Yoshizaki Hiroyoshi Sei Jong-Won Kim Misa Takegami Shin Yamazaki Yasuaki Hayashino rei Ono Koji Otani Miho Sekiguchi Shinichi Konno Shunichi Fukuhara Antonia J. Jakobson Paul Fitzgerald russell Conduit Xin Shirley Li Siu Ping Joyce Lam Wai Man Mandy Yu Yun Kwok Wing Kazue Okamoto-Mizuno Koh Mizuno Mituaki Yamamoto Shuichiro Shirakawa Hirokazu doi Mikako Kato Kazuyuki Shinohara Masako Tamaki Shiori Matsuda Katsuo Yamazaki Tadao Hori Keiko Ogawa Kazumi Takahashi Kunio Kitahama Katuo Yamazaki Yoshimasa Koyama Kohei Shioda Yugo Ueda Yukiko Nakamura Clara Inoue Kazushige Goto Sunao Uchida Yuko Morita Yoshiko Honda Tohru Kodama Mari Hagihara Toru Nakajima Masato Saito Yoshihiko Koga Shinichiro Tanaka Hiroshi Yamadera Madoka Takahara Sachiko Suwa Minoru Onozuka Sadao Sato Fumiharu Togo Taiki Komatsu Takeshi Mitani Jongbae Choi Bin Zhang Taeko Sasai Hiromi Mitsubayashi Mitsuhiro Ohtsu Isao Hasegawa Tatsuya Ishii Akira Komori Asami Suzuki Yue Nakahara Mitsuyasu Hiroki Mariko Nakauma Nobuo Someya Tomomasa Ochiai Shouhei Komori rayleigh Ping-Ying Chiang Zai-Ting Yeh Seong T. Kim Seung H. Yoon Jeong S. Kwon Jong H. Choi Hyung J. Ahn Youngsoo Kim Bolortuya Yunren Lichao Chen radhika Basheer robert W. Mccarley robert E. Strecker Makoto Honda Tetsuaki Arai Miyuki Fukazawa Yutaka Honda Kuniaki T Department of Psychiatry Gachon University of Medicine and Science Incheon Republic of Korea Department of Psychiatry Seoul National University Seoul Republic of Korea Department of Neuropsychiatry and Center for Sleep and Chronobiology Seoul National University Hospital Seoul Republic of Korea Department of Neuropsychiatry Seoul National University Hospital Seoul Republic of Korea Seoul National University Hospital Seoul Republic of Korea Department of Psychiatry Shiga University of Medical Science Otsu Japan Division of Public Health Department of Social Medicine Nihon University School of Medicine Tokyo Japan Department of Public Health Nihon University School of Medicine Tokyo Japan Division of Environmental and Preventive Medicine Department of Social Medicine Faculty of Medicine Tottori University Yonago Japan Department of Hygiene and Preventive Medicine Fukushima Medical University Fukushima Japan Department of Public Health Showa University School of Medicine Tokyo Japan Faculty of Humanities Seitoku University Matsudo Japan Section on Behavioral Science Division of Clinical Research National Hospital Organization Kurihama Alcoholism Center Yokosuka Japan Department of Otolaryngology Second Hospital Fujita Health University Nagoya Japan National Hospital Organization Kurihama Alcoholism Center Kanagawa Japan Metropolitan Police Department Criminal Investigation Laboratory Tokyo Japan Japan Somnology Center Neuropsychiatrie Research Institute Tokyo Japan Department of Somnology Tokyo Medical University Tokyo Japan Japan Somnology Center Neuropsychiatric Research Institute Tokyo Japan Department of Somnology Tokyo Medical and Dental University Tokyo Japan Center for Sleep and Chronobiology Department of Psychiatry and Behavioral Science Seoul National University College of Medicine Seoul Republic of Korea Department of Psychiatry and Behavioral Science Center for Sleep and Chronobiology Seoul Republic of Korea Department of Physiology Al

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reducing Transaction-Level Modeling Effort while retaining Low Communication Overhead for HW/SW Co-Emulation System

Reducing Transaction-Level Modeling Effort while Retaining L...

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International Symposium on VLSI design, Automation and Test

作者： Young-Il Kim Moo-Kyoung Chung Ando Ki Chong-Min Kyung R&D Center Dynalith Systems Company Limited Daejeon South Korea Department of EECS Korea Advanced Institute of Science and Technology Daejeon South Korea

ISBN: (纸本)1424405823

This paper presents a new scheme that reduces the modeling efforts of a transactor while retaining the performance of transaction-based verification for hardware/software co-emulation system. The conventional transaction-based verification requires the designer to develop a synthesizable transactor which interfaces with unfamiliar emulation-system-dependent protocol. The proposed method locates the transactor in the software side instead of in the hardware emulator. This allows easy-to-develop transactor described in high-level language. To reduce the communication time between testbench and dUT, we make the signal flow uni-directional by exploiting existing HdL testbench. The experimental results show that the proposed method is applicable to real-world test environment.

关键词： Hardware Emulation Communication system software Software performance Field programmable gate arrays System testing research and development Software systems Signal synthesis Protocols

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Casting and Modeling of Titanium Aluminides for Automotive 11

Casting and Modeling of Titanium Aluminides for Automotive

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11th World Conference on Titanium, Ti-2007

作者： Sung, Si-Young Choi, Bong-Jae Kim, Young-Jig Department of Advanced Materials Engineering Sungkyunkwan University 300 Chun-chun dong Jangan-gu Gyeonggi-do Suwon440-746 Korea Republic of Materials and Processing Engineering Center R&D Division Korea Automotive Technology Institute 74 Youngjung-Ri Pungse-Myun Chungnam Chonan330-912 Korea Republic of

ISBN: (纸本)9784889034066

The aim of this study is to optimize the economic net-shape forming of TiAl alloys for the automotive parts. The fluidity of TiAl alloys is increased with mold preheating temperature since they have a peritectic reaction that appears in the form of envelopment, surrounding each particles of the primary constituent. The thermo-physical variables estimated by casting process were applied to the modeling of TiAl alloy automotive parts casting using the Magmasoft®. The results of the investment casting and modeling of TiAl alloys confirm that the casting route can be an effective approach for the economic net-shape forming of TiAl alloys. © Ti-2007 - Proceedings of the 11th World Conference on Titanium. All rights reserved.

关键词： Investment casting

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Alpha-Case Controlled Titanium Alloys Casting 11

Alpha-Case Controlled Titanium Alloys Casting

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11th World Conference on Titanium, Ti-2007

ISBN: (纸本)9784889034066

The alpha-case formation mechanism was elucidated for the economic titanium casting. The α-case formation reaction between Ti and Al2O3 mold was examined in a plasma arc melting furnace. The reaction products were characterized by electron probe micro-analyzer and transmission electron microscopy. The α-case generation between Ti and Al2O3 mold was not able to be explained by the conventional α-case formation mechanism, which is known to be formed by the interstitials, especially oxygen dissolved from mold materials. However, from our experimental results and thermodynamic calculations, it was confirmed that the α-case is formed not only by an interstitial element but also by substitutional metallic elements dissolved from mold materials. Our newly established α-case formation mechanism will surely lead to a variety of significant applications of the α-case free Ti casting. © Ti-2007 - Proceedings of the 11th World Conference on Titanium. All rights reserved.

关键词： Titanium castings

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design Optimization of roller Straightening Process for Steel Cord using response Surface Methodology

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AIP Conference Proceedings 2007年第1期908卷 581-588页

作者： Jong‐Sup Lee Hoon Huh Jong‐Gu Bae Jun‐Wu Lee deuk‐Tae Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology 373‐1 Science Town Daejeon 305‐701 Korea R&D center KISWIRE 533 Nam‐Gu Pohang Kyungbuk 790‐840 Korea

A roller straightening process is a metal forming technique to improve the geometric quality of products such as straightness and flatness. The geometrical quality can be enhanced by eliminating unnecessary deformations produced during upstream manufacturing processes and minimizing any detrimental internal stress during the roller straightening process. The quality of steel cords can be achieved by the roller straightening depends the process parameters. Such process parameters are the roll intermesh, the roll pitch, the diameter of rolls, the number of rolls and the applied tension. This paper is concerned with the design optimization of the roller straightening process for steel cords with the aid of elasto‐plastic finite element analysis. Effects of the process parameters on the straightness of the steel cord are investigated by the finite element analysis. Based on the analysis results, the optimization of the roller straightening process is performed by the response surface method. The roller straightening process using optimum design parameters is carried out in order to confirm the quality of the final products.

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