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Study on the surface modification of the MH electrode with cobalt

Gongneng Cailiao/Journal of Functional Materials 2005年第11期36卷 1740-1743页

作者： Yang, Kai Wu, Feng Chen, Shi Zhang, Cun-Zhong National Development Center of Hi-Tech Green Materials School of Chemical Engineering and Environment Beijing Institute of Technology Beijing 100081 China

The metal-hydride electrode of the MH/Ni batteries was modified with a thin cobalt film using vacuum evaporate plating technology. The discharge capacity, high-rate dischargeability, cyclic stability and inner pressure of the batteries were tested. The XPS and XRD were used to analyze the surface and structure of the electrode. Experimental results indicated that the surface modification could decrease the resistance and increase the discharge capacity and voltage of the batteries. After surface modification, the discharge capacity at 5C (8.5 A) was increased by 120 mAh and discharge voltage was increased by 0.05 V, the resistance of the batteries was also decreased by 19.3%. The cyclic stability of the batteries was remarkably improved after surface modification. The remaining capacity of the modified batteries was 94.0% of the initial capacity even after 500 cycles. The inner pressure of the batteries during overcharging was lowered and the charging efficiency of the batteries was enhanced.

关键词： Cathodes

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Reconstruction algorithm with improved efficiency and flexibility in multi-slice spiral CT

Reconstruction algorithm with improved efficiency and flexib...

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2005 27th Annual International Conference of the engineering in Medicine and Biology Society, IEEE-EMBS 2005

作者： Sun, Wenwu Chen, Siping Zhuang, Tiange Nanchang Institute of Aeronautical Technology Nanchang China Shenzhen Anke Hi-Tech Corporation Limited Shenzhen China Department of Biomedical Engineering Zhejiang University Hangzhou China Department of Biomedical Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)0780387406

There is a requirement for the development of CT to scan rapidly large longitudinal volume with high z-axis resolution. The combination of spiral scanning with multi-slice CT is a promising approach. The algorithm of image reconstruction for multi-slice spiral CT becomes, therefore, the main challenge. All algorithms known to the authors either need to derive the complementary data or work only for certain range of pitch values. This paper presents a novel reconstruction algorithm that can omit the derivations of the complementary data and work for arbitrary pitch values. The filter interpolation based on the proposed method is also easy to be implemented. The method is, thus, versatile. The results of computer simulations show that we can choose a combination of scan and filter parameters to meet the purpose of the examination. © 2005 IEEE.

关键词： Algorithms

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Effect of Cobalt Phthalocyanine on Floating-Charge Performance of Nickel-Metal Hydride Battery

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Journal of Rare Earths 2004年第5期22卷 649-653页

作者：王芳吴锋陈实王国庆 School of Chemical Engineering and Environmental Science Beijing Institute of Technology National (Development) Center of Hi-Tech Green Materials Beijing 100081 China

In Ni-MH battery, oxygen evolution causes a high inner pressure during charge and overdischarge, and an inappropriate eliminating way of the oxygen in the battery results in accumulation of heat. This is the main obstacle to develop and apply high capability and high power battery. In this paper, effect of cobalt phthalocyanine (CoPc) on the floating-charge performance of Ni-MH batteries are examined. Experimental results show that the battery with CoPc additive by appropriate adding way displayed a better capability of floating charge and discharge than the one without CoPc. The battery with CoPc added into electrolyte shows the best charging efficiency and cycleability and the slowest increasing speed of inner pressure after 2000th charge and discharge.

关键词： Ni-MH batteries electrochemical catalyst cobalt phthalocyanine floating-charge inner pressure rare earths

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Electrochemical performance of nickel/metal hydride batteries under unconventional conditions and degradation analysis

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中国有色金属学会会刊：英文版 2004年第1期14卷 208-214页

作者：李丽吴锋杨凯王敬陈实 School of Chemical Engineering and Environmental Science Beijing Institute of Technology National Development Center of Hi Tech Green Materials

The charge discharge performance and cycle stability of D size Ni/MH batteries at -20 ℃, 25 ℃ and 55 ℃ were examined. The results show that the decline rate of Ni/MH battery discharge capacity at -20 ℃ and 55 ℃ are 12.1% and 13.6%,and the average discharge voltage decreases by a value of 0.13 V and 0.06 V respectively, cycling stability declines obviously at various temperatures. The capacity degradation of Ni/MH batteries under low temperature is reversible, belonging to transient degradation and that of high and normal temperatures are not reversible, belonging to permanent degradation. Electrochemical impedance spectroscopy, scanning electron microscope and energy dispersive X ray analyzer were introduced to study the main causes of cycling deterioration of Ni/MH batteries.

关键词： Ni/MH电池老化分析电化学性能循环寿命电极

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Conference on Parallel and Distributed Processing techniques and Applications (PDPTA'05): Foreword

Proceedings of the 2005 International Conference on Parallel...

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Proceedings of the 2005 International Conference on Parallel and Distributed Processing techniques and Applications, PDPTA'05 2005年

作者： Abachi, Hamid Abdullah, Rosni Ahuja, Sanjay P. Alghazo, Jaafar M. Andresen, Daniel Arabnia, Hamid R. Arcangeli, Jean-Paul Astsatryan, Hrachya Chandy, John Chen, Zizhong Chiu, Steve C. Chung, Ping-Tsai Constantinides, Constantinos DeMara, Ronald F. Dominguez, Francisca Quintana Goswami, Diganta Gravvanis, George A. Grosu, Daniel Guo, Minyi Sean He, Xiangjian Hsieh, Sun-Yuan Joe, Kazuki Kato, Hatsuhiko Kettimuthu, Rajkumar Lee, Jason R. Lee, Joohan Li, Kuan-Ching Liao, Weidong Liu, Dan Lopez, Elsa Maria Macias Lopez-Benitez, Noe Lu, Tianbo Marowka, Ami McDonald-Maier, Klaus D. Mun, Youngsong Nagar, Nitin Nakamori, Mario Oudshoorn, Michael Pang, Jun Park, Jin H. Pedersen, Matt Pescape', Antonio Power, David Shrikumar, H. Stiles, S. Su, H.C. Subramani, K. Tinetti, Fernando G. Veselovsky, Gennady Watson, Layne T. Wolfinger, Bernd E. Woo, Jongwook Xu, Baowen Yim, Keun Soo Young, Gilbert Zabir, Salim Zhang, Chaoyang Zhang, Xiaokun Monash University Australia Universiti Sains Malaysia Penang Malaysia University of North Florida Jacksonville FL United States American University in Dubai Dubai United Arab Emirates Kansas State University Manhattan KS United States University of Georgia GA United States University of Toulouse III Toulouse France Presidium of National Academy of Sciences Armenia University of Connecticut Storrs CT United States University of Tennessee Knoxville TN United States Benedict College Columbia SC United States Long Island University Brooklyn NY United States Concordia University QC Canada University of Central Florida Orlando FL United States University of Las Palmas de Gran Canaria Spain Indian Institute of Technology Guwahati India Democritus University of Thrace Greece Wayne State University Detroit MI United States University of Aizu Fukushima Japan University of Technology Sydney Australia National Cheng Kung University Taiwan Nara Women's University Nara City Japan Shonan Institute of Technology Japan Argonne National Laboratory United States Lawrence Berkeley National Lab United States Providence University Taiwan Shepherd University Shepherdstown WV United States Dalian Maritime University China Las Palmas de Gran Canaria University Spain Texas Tech University Lubbock TX United States Chinese Academy of Sciences Beijing China Hebrew University Israel University of Kent Canterbury Kent United Kingdom Soongsil University Seoul Korea Republic of Hawaii Pacific University HI United States Tokyo University of Agriculture and Technology Tokyo Japan Montana State University Bozeman MT United States INRIA France State University of New York at New Paltz NY United States University of Nevada Las Vegas NV United States University of Napoli Federico II Napoli Italy University College Cork Ireland CTO of Ipsil Inc United States Utah State University Logan UT United States Arkansas State University AR United States West Virginia Unive

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Degradation Behavior of Electrochemical Performance of Sealed-Type Nickel/Metal Hydride Batteries

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Journal of Rare Earths 2003年第3期21卷 341-346页

作者：李丽吴锋杨凯 School of Chemical Engineering and Environmental Science Beijing Institute of TechnologyNational Development Center of Hi-Tech Green Materials

The degradation mechanism of electrochemical performance of sealed type nickel/metal hydride batteries was investigated. The results indicate that the degradation behavior of Ni/MH battery is not only owing to the lack of electrolyte, but also the deterioration of the active materials on the positive and negative electrodes of Ni/MH batteries. Scanning electron micrographs (SEM), X ray diffraction (XRD) and laser granularity analyses are presented. The particle pulverization and oxidation during charge/discharge are identified as the main causes for deterioration of the negative and positive electrode in nickel/metal hydride batteries, as well as the cross section cracking of both anode and cathode.

关键词： degradation behavior metal hydride electrode cycle life rare earths

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Transforming the engineering curriculum: Lessons learned from a summer at boeing

Transforming the engineering curriculum: Lessons learned fro...

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作者： Gorman, Michael E. Johnson, Vicki S. Ben-Arieh, David Bhattacharyya, Shankar Eberhart, Scott Glower, Jacob Hoffmann, Klaus Kanda, Arun Kuh, Anthony Lim, Tae Wook Lyrintzis, Anastasios Mavris, Dimitri Schmeckpeper, Edwin Varghese, Philip Wang, Yu University of Virginia United States Embry-Riddle Aero. University United States Kansas State University United States Texas A and M University United States University of Washington United States North Dakota State University United States Wichita State University United States Indian Institute of Technology India University of Hawaii United States University of Kansas United States Purdue University United States Georgia Tech. United States University of Idaho United States University of Texas Austin United States University of Maryland United States Dept. of Industrial Engineering 216 Durland Hall Kansas State University Manhattan KS 66504 United States EE Department Texas A and M University College Station TX 77845 United States Dept. of Aeronautics BOX 352400 University of Washington Seattle WA 98195-2400 United States Dept. of Electrical Engineering North Dakota State University Fargo ND 58105 United States TCC and Systems Engineering Sch. of Engineering Applied Science University of Virginia Charlottesville VA 22902 United States Department of Aerospace Engineering Wichita State University Wichita KS 67260-004 United States Indian Institute of Technology Delhi India Dept. of Electrical Engineering University of Hawaii Honolulu HI 96822 United States Naval Research Laboratory 4555 Overlook Ave. Washington DC 20375 United States Sch. of Aeronautics and Astronautics Grissom Hall Purdue University West Lafayette IN 47907 United States Aerospace Systems Design Laboratory School of Aerospace Engineering Georgia Institute of Technology Atlanta GA 30332-0150 United States Department of Civil Engineering University of Idaho P.O. Box 441022 Moscow ID 83844-1022 United States Center for Aeromechanics Research Department of Aerospace Engineering University of Texas Austin TX 78712-1085 United States Director of Mfg. Automat. Laboratory Department of Mechanical Engineering University of Maryland College Park MD 20742 United States

The Boeing Corporation conducts an A.D. Welliver summer fellowship program for engineering educators. This article describes the lessons learned by the 1998 summer Fellows. These include increasing emphasis on cost, communications and continuous learning, modifying faculty promotion guidelines to honor collaboration in teaching and research, and collaborating with industry on exit criteria. Eventually, industry has to become a partner in the educational process. The Fellows unanimously agreed that the Welliver Program was a valuable experience.

关键词： engineering education

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PERFORMANCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A MULTISERVICE MULTIBEAM SATELLITE

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 283-297页

作者： BOHM, S ELHAKEEM, AK HAChiCHA, M Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada An Associate Director of Advanced Technology & Networks Group VISTAR Telecommunications Inc. Ottawa Canada. He is also an Adjunct Pr

In this paper, we study the performance of a prioritized on-board baseband switch in conjunction with a multibeam satellite handling integrated services. The services considered for the analysis include voice, video, file transfer and interactive data. The prioritized switch uses both input and output buffering, switch speed-up as well as a two-phase head-of-line resolution algorithm, in order to reduce the buffer loss while maintaining acceptable user delays. The minimum required buffer capacity and switch speed-up for each service in a prioritized environment are found under uniform traffic conditions. It is shown that under uniform traffic conditions, only minimal buffering and switch speed-up are needed even for the lowest priority users. The performance dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environment.

关键词： SWITCH ON-BOARD BASEBAND MULTIBEAM PRIORITIZED HEAD-OF-LINE UNIFORM LOAD SPEED-UP

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Biomass gasification hot gas cleanup for power generation

Biomass gasification hot gas cleanup for power generation

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1993 Joint Power Generation Conference: GT Papers, JPGC 1993

作者： Wiant, Benjamin C. Florida, Orlando Bachovchin, Dennis M. Carty, Ronald H. Horazak, Dennis A. Ruel, Roy H. Emerging Technologies Westinghouse Electric Corp. OrlandoFL United States Michael Onischak Gasification Research Institute of Gas Technology ChicagoIL United States Science and Tech. Center Westinghouse Electric Corp. PittsburghPA United States Process Research Institute of Gas Technology ChicacoIL United States Advanced Engineering Gilbert/Commonwealth ReadingPA United States Energy and Resources Div. Pacific International Ctr. for High Tech. Research HonoluluHI United States

ISBN: (纸本)9780791879092

In support of the U.S. Department of Energy's Biomass Power Program, a Westinghouse Electric led team consisting of the institute of Gas technology, Gilbert/Commonwealth, and the Pacific International Center for high technology Research, is conducting a 30-month research and development program to provide validation of hot gas cleanup technology with a pressurized fluidized bed, air-blown, biomass gasifier for operation of a combustion turbine. This paper discusses the gasification and hot gas cleanup processes, scope of work and approach, and the program's status Copyright © 1993 by ASME.

关键词： Gasification

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