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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Helps, C. Richard G. Brigham Young University Dept. of Electronics Engineering Technology Program BYU

The modified form of the "Knowing, Thinking, Doing" model and "Vision, structure, Detail" model was discussed. The two models were complementary in nature having different strengths and limitations and emphasized different aspects of technology education. A complete description of the required thinking skills was developed to define four-year engineering technology program. However, the combination of the two models leads towards a clearer vision of engineering technology education.

关键词： engineering education

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Problem solving in engineering technology: Creativity, estimation and critical thinking are essential skills

Problem solving in engineering technology: Creativity, estim...

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Lunt, Barry M. Helps, C. Richard G. Electronics Engineering Technology Brigham Young University Dept. of Electron. Eng. Technology Brigham Young University Provo UT Electronics Eng. Technology Program BYU

The process of design, which is a problem-solving process in engineering technology, is discussed. It is suggested that students should be taught the skills that will make them more proficient in design. Three key skills which are essential are creativity, estimating, and critical thinking. The steps in the process of design comprise developing of functional specifications and the concept design, generating design alternatives, selecting and modeling the best alternatives, and testing and verifying the design.

关键词： engineering education

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Protein titration control and monitoring system: a collaborative, real-world course project

Protein titration control and monitoring system: a collabora...

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Vaughan, Anthony Abe, Tomoki Kurpad, Krishna Thurlkill, Richard Porter, Jay Morgan, Joseph Texas A and M University Electronics Engineering Technology Texas A and M University Engineering Technology Program Texas A and M University Electron. and Telecom. Eng. Technol.

Currently, The Texas A&M University System Health Science Center College of Medicine uses a manually-operated system for the pH titration of histidine penta-peptides, model compounds and proteins. The data collected from this system will be used to determine the pKa of the histidine side-chain in these different compounds. This information will be added to the world-wide data base of pKa's collected and will contribute to our understanding of how pKa's are affected by their local environment and will contribute to the development of new drugs and/or drug delivery systems. To increase data collection efficiency, the Health Science Center approached the electronics and Telecommunications engineering technology programs about automating the titration system. The Protein Titration Control and Monitoring system was assigned as the course project in an undergraduate data acquisition and process control class that is taught at the junior-level. The students were required to work in four to five-person teams to develop a complete system-level design, implement the design in hardware and software, and test and deliver an operational system to the sponsor. The software was designed and implemented using National Instruments LabVIEW graphical development environment and a standard data acquisition card installed in a desktop computer. The system accepts inputs from the researcher, automates the entire titration and data collection process, databases the pertinent information, and correctly terminates the experiment. The system can be operated in a local mode or the experimenter can initiate a data collection session, monitor the progress of the experiment in real time, and access the recorded results via the Internet using LabView Data Socket technology.

关键词： engineering education

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Multi-converter power electronic systems: definition and applications

Multi-converter power electronic systems: definition and app...

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Annual IEEE Conference on Power electronics Specialists (PESC)

作者： A. Emadi M. Ehsani Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA Department of Electrical Engineering Advanced Vehicle Systems Research Program Texas A and M University College Station TX USA

In multi-converter power electronic systems, different converters such as DC/DC choppers, DC/AC inverters, and AC/DC rectifiers are used in source, load, and distribution subsystems to provide power at different voltage levels and forms. Most of the loads are also in the form of power electronic converters and motor drives. The most popular examples of these systems are automotive systems and more electric/hybrid electric vehicles. These systems have unique characteristics, dynamics, and stability problems that are just beginning to be appreciated. In this paper, we take a closer look at multiconverter power electronic systems and address the fundamental problems faced in these systems.

关键词： Power electronics Analog-digital conversion Choppers Inverters Rectifiers Voltage Motor drives Automotive engineering Hybrid electric vehicles Vehicle dynamics

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Dynamics and control of multi-converter DC power electronic systems

Dynamics and control of multi-converter DC power electronic ...

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Annual IEEE Conference on Power electronics Specialists (PESC)

作者： A. Emadi A. Ehsani Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA Advanced Vehicle Systems Research Program Department of Electrical Engineering Texas A and M University College Station TX USA

In multi-converter power electronic systems, different power electronic converters are integrated together to form a complex and extensively interconnected system. In general, there are two kinds of loads in these systems. One group is conventional loads, which have positive incremental impedance characteristics. They are mainly considered as constant voltage loads that require regulated voltage for their operation. The other group is tightly regulated power electronic converters and motor drives sinking constant power from their input buses. The purpose of this paper is to present an assessment of the dynamic interactions between these loads in the multi-converter DC power electronic systems. Furthermore, a nonlinear robust stabilizing controller based on the feedback linearization technique for DC/DC PWM converters is presented.

关键词： Control systems Power electronics Voltage Interconnected systems Impedance Motor drives Robust control Linear feedback control systems Linearization techniques Pulse width modulation converters

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The Deepwater Project - A sea of change for the USCoast Guard

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NAVAL ENGINEERS JOURNAL 1999年第3期111卷 125-131页

作者： Anderson, M Burton, D Palmquist, MS Watson, JM Lieutenant Commander Michael Anderson:serves as the Communications Director for the Coast Guard's Deepwater Project. He has an extensive background in electronic systems with previous work experience including–lead electronics design engineer for the Coast Guard's new HEALY icebreaker supervisor of west coast shipboard electronics projects and Commanding Officer of a regional electronics support command. LCdr. Anderson holds a BS degree in electrical engineering from the Coast Guard Academy MS degrees in electrical engineering and engineering management from Northeastern University and recently received an MS in the management of technology from MIT. Diane Burton:is Surface Technical Director for the U.S. Coast Guard Deepwater Project. Previously she worked as a senior Naval architect in the Hull Form and Hydrodynamics Division of the Naval Sea Systems Command. She has worked for several years on the hydrodynamics of a variety of ship classes with the U.S. Navy U.S. Coast Guard and NOAA. She was responsible for surface ship developments and small combatant stability updates which include the following tasks: Hull Form Design System (HFDS) upgrades Integrated Computation Design Environment Database development for NAVSEA's Hydrodynamics/Hydroacoustics Technology Center Cooperative Research Navies international program for the development for dynamic stability criteria and FFG/DDG class stability. She has a BSE and MSE from the University of Michigan in naval architecture and marine engineering and is presently pursuing a masters of engineering management from George Washington University specializing in systems engineering technology insertion and project management. Commander M. Steven Palmquist:is the Deepwater Project's Assistant Project Manager for C4ISR. A Registered Prokssional Engineer he received an MSEE from the Naval Postgraduate School in 1988. He did undergraduate work in naval architecture at the University of Michigan and is also a graduate of the National Test Pilot School's Avionics Tes

The United States Coast Guard has embarked on the most ambitious modernization and recapitalization project in the service's history. The Deepwater Capabilities Replacement Project, which is simply referred to as Deepwater, is unique in that it comprises the acquisition of an entire integrated "System-of-Systems'': surface, air, (CISR)-I-4 (command, control, communications, computers, information, surveillance & reconnaissance), and logistics facilities. This "System of Systems" approach will enable the Coast Guard to acquire the optimal mix of fully supportable assets, to effectively and efficiently perform all of its Deepwater missions well into the next century.

关键词： Naval warfare

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Insulating state in open quantum dots and quantum dot arrays

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Annalen der Physik 1999年第1期9卷

作者： F. Ge C. Prasad A. Andresen J.P. Bird D.K. Ferry L.-H. Lin N. Aoki K. Nakao Y. Ochiai K. Ishibashi Y. Aoyagi T. Sugano Center for Solid State Electronics Research & Department of Electrical Engineering Arizona State University Tempe AZ 85287-5706 USA Department of Materials Technology Chiba University 1-33 Yayoi-cho Inage-ku Chiba 236-8522 Japan Nanoelectronic Materials Laboratory Frontier Research Program RIKEN 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan

We describe the observation of novel localization in mesoscopic quantum dots and quantum dot arrays, which are realized in high mobility GaAs/AlGaAs heterojunctions using the split-gate technique. With a sufficient gate voltage applied to form the devices, their resistance diverges as the temperature is lowered below a degree Kelvin, behavior which we attribute to localization. Evidence for the localization is found over the entire range of gate voltage for which the dots are defined, persisting to conductances higher than 50 e 2 / h .

关键词： Localization Quantum dots Scaling

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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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Application of high temperature superconducting wire to magnetostrictive transducers for underwater sonar

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NAVAL ENGINEERS JOURNAL 1997年第1期109卷 31-39页

作者： Joshi, CH Lindberg, JF Clark, AE Dr. Chad H. Joshi:is president of Energen Incorporated an engineering and development firm specializing in cryogenic and electromechanical systems. The research presented here was conducted while he was employed at American Superconductor Coporation where he held both technical and program management positions. While there Dr. Joshi managed the development of several demonstration products including the sonar transducer presented here. He holds M.S. and Sc.D. degreesfrom the Massachusetts Institute of Technology and a B.S. degree from the Worcester Polytechnic Institute. He has worked in several diverse fields including solar energy fluidized bed technology and superconductivity. His work on stochastic analysis of solar insolation was recognized by the ASME and his doctoral research was accorded international recognition for its unique contribution to understanding quenching in superconducting magnets. Dr. Joshi has numerous patents and more than thirty-five technical publications to his credit. He is a registered Professional Engineer in Massachusetts and an active member of ASME and IEEE. He is a co-founder and treasurer of the New England Chapter of the Cryogenics Society of America. He will be listed in Whos Who in the East in 1997. Jan Lindberg:is a physicist in the Transducers and Arrays Division of the Naval Undersea Warfare Center in New London Connecticut. He leads NUWC'S exploratory development efforts for transduction science and currently is spearheading an effort to introduce high-energy density active materials into tactical sonar systems. With the discovery of high temperature superconductivity he saw the potential benefit of integrating several emerging technologies and enticed American Superconductor Corp. to develop a high temperature superconducting transducer which resulted in the March 1993 demonstration of the world's first integrated high temperature superconducting device. Mr. Lindberg's current interests involve design of high power ultrasonic copolymer arrays characterization of

A low-frequency underwater acoustic transducer integrating high-temperature superconducting (HTS) coils and terbium-dysprosium (TbDy) magnetostrictive material was designed, fabricated and tested. This represents a novel application for high-temperature superconductivity and is a first example of an integrated system involving HTS coils cooled by a mechanical cryocooler. It also brings HTS technology together with a novel magnetic materials technology. The I-ITS coils were fabricated using react-and-wind BiSrCaCuO-2223 HTS wires. They produce a peak field of 0.1 Tesla at 50 K. A single-stage, Stirling-cycle cryocooler was used to cool the coils and the TbDy driver to cryogenic temperatures (50-65K). The coils provide an AC magnetic field superimposed on a DC bias field, which produces oscillatory strain within the magnetostrictive rod;this motion is transmitted through a cryostat to two head masses which project sound into the surrounding environment. High power acoustic output can be obtained by operating the transducer at its resonance frequencies of 520 Hz in air and 430 Hz underwater. This development demonstrates that, unlike low temperature superconductors, HTS wires can be considered for AC applications due to the low losses in these superconductors and the higher heat capacities of materials at temperatures above liquid helium.

关键词： Underwater equipment

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Time synchronization services aboard surface ships

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NAVAL ENGINEERS JOURNAL 1996年第6期108卷 73-84页

作者： ODonoghue, KF Marlow, DT [?]Karen O'Donoghue is an electronics engineer working in the area of tactical networking at the Naval Surface Warfare Center Dahlgren Division. She holds B.S. and M.S. degrees in electrical engineering from Tennessee Technological University. Ms. O'Donoghue has nine years of experience working with communications and networking technology for the Navy. She has participated in Navy-wide network standardization efforts. She has also participated in national and international commercial standards activities including serving as technical editor. Currently she is working on time synchronization technology for the Aegis program.

The modern day surface ship is composed of a number of individual systems which together operate the platform. Vital to making such a collection of systems work in this real-time environment is a common understanding of time. As additional functions and processors are added to systems, more demands are being placed on the time distribution function. Experience has shown that currently employed techniques for time distribution are not scalable to the more distributed approaches for building shipboard control systems. Use of Commercial-Off-The-Shelf (COTS) components also drives the need for new approaches to implementing time services. This paper presents requirements for time services, an overview of current time synchronization approaches, and a technical approach being investigated for future shipboard time synchronization.

关键词： Ships

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