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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： N. Xiong X. Defago X. Jia Y. Yan Y. He State Key Laboratory of Software Engineering Computer School Wuhan University of China China School of Information Science Japan Advanced Institute of Science and Technology Japan PRESTO Japan Science and Technology Agency Japan School of Information Science Japan Advanced Institute of Science and Technology Nomi Ishikawa Japan Member of IEEE Communication Society Computer School Wuhan University Department of Computer Science City University of Hong Kong Kowloon Hong Kong China School of Computer Science and Technology Wuhan University of Science and Technology China The State Key Lab of Software Engineering Computer School Wuhan University

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XRD and HRTEM analyses of the ball milled nanocrystalline FeNi alloy

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第5期28卷 4-7页

作者： Wang, Wei Guan, Jian-Guo Wang, Qi Zhang, Qing-Jie State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering University of Jinan Jinan 250022 China

The nanostructure of the ball milled FeNi particles were characterized as functions of the ball milling time (t) using quantitative X-ray diffraction (XRD), high resolution transmission electronic microscopy (HRTEM) analysis techniques. The results showed that the nanocrystalline bcc FeNi particles were available using carbonyl iron and nickel powders as the raw materials during the high-energy ball milling. After 10 h ball milling, the alloy of carbonyl iron and carbonyl nickel began to form, and the sample kept its original bcc and fcc structure;after 100 h ball milling, the sample became a solid solution with bcc structure;after 200 h ball milling, the diffraction peak of Ni almost disappeared and the isotropic grains with Dmin achieved, which was mainly attributed to the dislocations of the nanocrystalline bcc FeNi suffering from severe plastic deformation by ball milling.

关键词： Alloy Carbonyl iron Carbonyl nickel High energy ball milling Nanocrystalline materials

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Microstructure of NiCr/WC nanocrystaline coating material prepared by ball-milling technology

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Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment 2006年第6期27卷 21-24页

作者： Zhou, Xiang-Lin Zhang, Ji-Shan Fan, Jian-Zhong Fan, Zi-Shuan Sun, Dong-Bai State Key Lab. for Advanced Materials University of Science and Technology Beijing Beijing 100083 China Beijing Nano Surface Technology and Engineering Research Center Beijing 100083 China General Research Institute for Non-Ferrous Metals Beijing 100083 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The nano-size (Ni-20% Cr)/35% WC (mass fraction) composite powders were prepared by high energy ball-milling in liquid nitrogen medium. SEM, TEM, X-ray diffraction methods were used to analyze the microstructure of the powders. The relationship between crystal grains size and milling time was investigated. The results show that the grains size obviously decreases with the increase of milling time within 12 hours, and beyond 12 hours the grains size changes slowly. The particle sizes of the NiCr and WC powders with quasi-sphere shape and multi-crystal structures are homogenously distributed. The nano-sized composite powders keep a very line thermal stability. After heating at 1000°C for 0.5 h, their size grows up slightly but still keeps within nano-meter scale.

关键词： Microstructure

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Microstructures and Microwave Dielectric Properties of La-Substituted Ba(Mg_1/3Nb_(2/3))O_3 Ceramics

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Journal of Rare Earths 2005年第S1期23卷 171-174页

作者：田中青韩星余洪滔张津黄伟九 School of Materials Science and Engineering Chongqing Institute of Technology Chongqing 400050 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China) State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering Chongqing Institute of Technology Chongqing 400050 China

La substituted Ba(Mg_ 1/3Nb_ 2/3)O_3 ceramics was expected to enhance the 1∶2 ordering degree of B-site ions due to the existence of vacancies that promote cation movement and result in improvement of the Q_f value. The relation between the microstructure and microwave dielectric properties of Ba_ 1-xLa_ 2x/3(Mg_ 1/3Nb_ 2/3)O_3 ceramics was investigated. La substituted Ba(Mg_ 1/3Nb_ 2/3)O_3 ceramics can improve the sinterability of specimens. Both 1:2 ordering degree and grain size increase as A-site vacancies increase. This can be explained by the existence of vacancies that promote cation movement. The Q_f value increase with small La content, then decrease rapidly. The highest Q_f value achieved in this investigation is about 55000 GHz for Ba_ 0.995La_ 0.01/3(Mg_ 1/3Nb_ 2/3)O_3. The improvement of Q_f value with A-site vacancies is related to the increase of the degree of B-site ordering and grain size of the specimen.

关键词： barium magnesium niobate microwave dielectric properties ordering microstructure

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LRC-RED: A self-tuning robust and adaptive AQM scheme

LRC-RED: A self-tuning robust and adaptive AQM scheme

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6th International Conference on Parallel and Distributed Computing, Applications and Technologies, PDCAT 2005

作者： Xiong, Naixue Yang, Yan Défago, Xavier He, Yanxiang School of Information Science Japan Advanced Institute of Science and Technology 1-1 Asahidai Nomi Ishikawa Japan State Key Lab of Software Engineering Computer School Wuhan University China Computer School Wuhan University of Science and Technology China

ISBN: (纸本)0769524052

In this paper, we propose a novel active queue management (AQM) scheme based on the Random Early Detection (RED) of the loss ratio and the total sending rate control, called LRC-RED, to regulate the queue length with small variation and to achieve high utilization with small packet loss. This scheme measures the latest packet loss ratio, and uses it and the total sending rate as complements to queue length in order to dynamically adjust packet drop probability. Further, we also provide the design rules for this scheme based on the well-known TCP control model. On the basis of the design rules, we develop a simple, scalable and systematic rule for tuning the control parameters which can be adaptive to dynamic network conditions. Through ns 2 simulations, we show the faster response time and better robustness of the proposed LRC-RED as compared with the Loss Ratio based RED (LRED) [5] algorithm.

关键词： Adaptive systems

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Influence of sintering on quality factor of Ba(Mg/13Nb/23)O3 ceramic

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2005年第6期27卷 5-7+14页

作者： Tian, Zhong-Qing Liu, Han-Xing Wang, Hao Yu, Hong-Tao School of Materials Science and Engineering Chongqing Institute of Technology Chongqing 400050 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The influences of sintering temperature, soaking time and annealing time on the quality factor of Ba(Mg/13Nb2/3)O3 microwave dielectric ceramic were investigated. The result showed that Qf value increased as the sintering temperature increasing. It was ascribed to the increasing of the relative density and ordering parameter S. The maximum value of Qf, 49500 GHz, was gained at 1550°C. With soaking time increasing, Qf value increased. The increasing of B-site 1:2 ordering degree and grain size should be responsible for the improvement of Qf value. When soaking time was 16 h, Qf value reached 58000 GHz. Annealing time had great effect on Qf value. With annealing time increasing, Qf value increased quickly. This was because of the improvement of B-site 1:2 ordering caused by annealing. A high Qf value, 71500 GHz, was acquired when annealing time was 48 h.

关键词： Ba(Mg/13Nb/23)O3 Microwave dielectric ceramic Quality factor

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Influence on Rolling Contact Fatigue Life of GCr15 Steel Treated by Plasma Immersion Ion Implantation

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材料保护 2004年第S2期37卷 144-145页

作者： WNAG Lang-ping WNAG Xiao-feng TANG Bao-yin LIU Dan SUN Tao HU Li-guo State key lab of advanced welding production technology Harbin institute of technology Harbin 150001 School of Mechanical and Electrical Engineering Harbin Institute of Technology Harbin 150001 P. R. China

Plasma Immersion Ion Implantation (PIII) has been proved to be a useful technique for surface modification of components with sophisticated shape. Based on the results of conventional three-ball-on-rod testing, the rolling contact fatigue (RCF) life of GCr15 steel treated by PIII technique was studied. During the study, nitrogen plasma was generated and the implantation voltage was varied from 20 to 40 kV. The fatigue test results reveal that implantation voltage has a great influence on RCF life. Compared with the untreated sample, N10and N50 (failure probability is 10% and 50% , respectively) life of the sample with the implantation voltage of 30 kv was increased by 58.8% and 223.5% , respectively.

关键词： plasma immersion ion implantation rolling contact fatigue GCr15 steel

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Contributory presentations/posters

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Journal of Biosciences 1999年第1期24卷 33-198页

作者： N. Manoj V. R. Srinivas A. Surolia M. Vijayan K. Suguna R. Ravishankar R. Schwarzenbacher K. Zeth Diederichs G. M. Kostner A. Gries P. Laggner R. Prassl Madhusudan Pearl Akamine Nguyen-huu Xuong Susan S. Taylor M. Bidva Sagar K. Saikrishnan S. Roy K. Purnapatre P. Handa U. Varshney B. K. Biswal N. Sukumar J. K. Mohana Rao A. Johnson Vasantha Pattabhi S. Sri Krishna Mira Sastri H. S. Savithri M. R. N. Murthy Bindu Pillai Kannan M. V. Hosur Mukesh Kumar Swati Patwardhan K. K. Kannan B. Padmanabhaa S. Sasaki-Sugio M. Nukaga T. Matsuzaki S. Karthikevan S. Sharma A. K. Sharma M. Paramasivam P. Kumar J. A. Khan S. Yadav A. Srinivasan T. P. Singh S. Gourinath Neelima Alam A. Srintvasan Vikas Chandra Punit Kaur Ch. Betzel S. Ghosh A. K. Bera S. Bhattacharya S. Chakraborty A. K. Pal B. P. Mukhopadhyay I. Dey U. Haldar Asok Baneriee Jozef Sevcik Adriana Solovicova K. Sekar M. Sundaralingam N. Genov Dong-cai Liang Tao Jiang Ji-ping Zhang Wen-rui Chang Wolfgang Jahnke Marcel Blommers S. C. Panchal R. V. Hosur Bindu Pillay Puniti Mathur S. Srivatsun Ratan Mani Joshi N. R. Jaganathan V. S. Chauhan H. S. Atreya S. C. Sahu K. V. R. Chary Girjesh Govil Elisabeth Adjadj Éric Quinjou Nadia Izadi-Pruneyre Yves Blouquit Joël Mispelter Bernadette Heyd Guilhem Lerat Philippe Milnard Michel Desmadreil Y. Lin B. D. Nageswara Rao Vidva Raghunathan Mei H. Chau Prashant Pesais Sudha Srivastava Evans Coutinho Anil Saran Leizl F. Sapico Jayson Gesme Herbert Lijima Raymond Paxton Thamarapu Srikrishnan C. R. Grace G. Nagenagowda A. M. Lynn Sudha M. Cowsik Sarata C. Sahu S. Chauhan A. Bhattacharya G. Govil Anil Kumar Maurizio Pellecchia Erik R. P. Zuiderweg Keiichi Kawano Tomoyasu Aizawa Naoki Fujitani Yoichi Hayakawa Atsushi Ohnishi Tadayasu Ohkubo Yasuhiro Kumaki Kunio Hikichi Katsutoshi Nitta V. Rani Parvathy R. M. Kini Takumi Koshiba Yoshihiro Kobashigawa Min Yao Makoto Demura Astushi Nakagawa Isao Tanaka Kunihiro Kuwajima Jens Linge Seán O. Donoghue Michael Nilges G. Chakshusmathi Girish S. Ratnaparkhi P. K. Madhu R. Varadarajan C. Tetreau Molecular Biophysics Unit Indian Institute of Science Bangalore India Austrian Academy of Sciences Institute of Biophysics and X-ray Structure Research Graz Austria Faculty of Biology University of Konstanz Germany Institute of Medical Biochemistry University of Graz Austria Howard Huges Medical Institute Department of Chemistry & Biochemistry University of California La Jolla USA Department of Chemistry & Biochemistry University of California San Diego La Jolla USA Molecular Biophysics Unit India Department of Microbiology &Cell Biology Indian Institute of Science Bangalore India Macromolecular Structure Laboratory NCI - Frederick Cancer Research and Development Center ABL - Basic Research Program Frederick USA Department of Crystallography and Biophysics University of Madras Chennai Biochemistry Department Indian Institute of Science Bangalore India Condensed Matter Physics Division B.A.R.C. Trombay Mumbai Condensed Matter Physics Division Bhabha Atomic Research Centre Trombay Mumbai IMCB The University of Tokyo Tokyo Japan Mitsubishi Chemical Corporation Yokohama Research Center Yokohama Japan Faculty of Pharmaceutical Sciences Chiba University Chiba Japan Department of Biophysics All India Institute of Medical Sciences New Delhi India Department of Biophysics All India Institute of Medical sciences New Delhi India Institüt Physiologische Chemie Hamburg Germany Biophysics Department Bose Institute Calcutta India Slovak Academy of Sciences Institute of Molecular Biology Bratislava Slovakia Indian Institute of Science Bioinformatics Centre Bangalore Departments of Chemistry and Biochemistry Biological Macromolecular Structure Center USA Bulgarian Academy of Sciences Institute of Organic Chemistry Sofia Bulgaria Chinese Academy of Sciences Institute of Biophysics Beijing China Novartis Pharma AG Preclinical Research Basel Switzerland Department of Chemical Sciences Tata Institute of Fundamental Research Mumbai India Solid State Physics Div

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CHANNEL ACCESS PROTOCOLS FOR KU-BAND VSAT NETWORKS - A COMPARATIVE-EVALUATION

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IEEE COMMUNICATIONS MAGAZINE 1988年第5期26卷 34-44页

作者： RAYCHAUDHURI, D JOSEPH, K State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The performance of candidate protocols for first-generation Ku-band very small aperture terminal (VSAT) satellite networks is compared. The goal is to assist the process of selecting a protocol. The performance comparison is carried out over a range of possible traffic, channel and satellite parameters, leading to an understanding of the appropriate regime for each of the protocols under consideration. The protocols considered are unslotted Aloha, slotted Aloha, selective-reject (SRE) Aloha, and demand-assigned time-division multiple-access (TDMA) or DAMA.< >

关键词： Access protocols Satellite broadcasting Costs Satellite ground stations Artificial satellites Time division multiplexing Local area networks Apertures Wide area networks Power generation economics

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A TECHNIQUE FOR DETECTING RESONANCE

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 1988年第2期37卷 326-326页

作者： LAFFERTY, RE State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The dip-meter for detecting resonance in L-C circuits and transmission lines has all but disappeared. For those who occasionally have need to explore resonant conditions, the author has found a suitable substitute in a wideband signal generator and a sensitive RF millivoltmeter. Measurements have been made from low radio frequencies to over 2 GHz.

关键词： radiofrequency broadband signal Power cables RESONANCE Writers Generator Substitute Electric circuits Transmission Lines dynamos

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