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Electrical resistivity & thermal stability of smooth silver thin film for nanoscale optoelectronic devices

Electrical resistivity & thermal stability of smooth silver ...

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2008 8th IEEE Conference on Nanotechnology, IEEE-NANO

作者： Logeeswaran, V.J. Katzenmeyer, A. Islam, M. Saif Kobayashi, Nobuhiko P. Wu, W. Chaturvedi, P. Fang, Nicholas Wang, S.Y. Williams, R. Stanley Department of Electrical and Computer Engineering Kemper Hall University of California at Davis One Shields Ave Davis CA 95616 United States Baskin School of Engineering University of California Santa Cruz Santa Cruz CA 95064 United States Department of Mechanical Science and Engineering University of Illinois Urbana-Champaign 1206 W. Green Street Urbana IL 61801 United States Information and Quantum Systems Lab Advanced Studies Hewlett-Packard Laboratories 1501 Page Mill Rd MS 11-23 Palo Alto CA 94304 United States Advanced Studies Laboratories University of California Santa Cruz and NASA Ames Research Center Moffett Field CA 94035 United States

ISBN: (纸本)9781424421046

We discuss the electrical resistivity and thermal stability of smooth thin silver (Ag) films characterized by significantly lower root mean square (RMS) surface roughness, peak-to-valley height distribution, and grain-size distribution. The smooth film was prepared by using a very thin (~1-2 nm) nucleation layer of evaporated germanium (Ge) prior to Ag evaporation. The sheet resistance of the rough silver (10nm Ag) film is RAg-rough ~51 Ω/sq compared to the smooth silver (10nm Ag/2nm Ge) film with R Ag-smooth ~22 Ω/sq. The smooth Ag is also shown to be thermally more stable for temperatures less than 120C. © 2008 IEEE.

关键词： Surface roughness

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Basic performance of a desktop NC machine tool with compliant motion capability

Basic performance of a desktop NC machine tool with complian...

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IEEE International Conference on Mechatronics and Automation

作者： Fusaomi Nagata Shintaro Tani Takanori Mizobuchi Tetsuo Hase Zenku Haga Masaaki Omoto Keigo Watanabe Maki K. Habib Department of Electronics and Computer Science Tokyo University of Science Sanyo-Onoda Japan Research & Development Center Meiho Company Limited Nogata Japan Department of Advanced Systems Control Engineering Graduate School of Science and Engineering Saga University Saga Japan Mechanical Engineering Department School of Sciences and Engineering American University Cairo Cairo Egypt

In this paper, a new desktop NC machine tool with compliance controllability is presented for finishing metallic molds with small curved surface. The NC machine tool consists of three single-axis robots with high position resolution. A tool attached to the tip of the z-axis has a small ball-end shape. Also, the control system of the NC machine tool is composed of a force feedback loop, position feedback loop and position feedforward loop. The force feedback loop controls the polishing force consisting of tool contact force and kinetic friction force. The position feedback loop controls the position in pick feed direction. Further, the position feedforward loop leads the tool tip along cutter location data. It is expected that the NC machine tool delicately removes surface cusps with under about 0.3 mm height on a mold, and finishes the surface with high quality. In order to first confirm the application limit of a conventional industrial robot to a finishing task, we evaluate the backlash that causes the position inaccuracy at the tip of the abrasive tool, through a simple position/force measurement. Through a similar position/force measurement and a surface following control experiment along a lens mold, the basic position/force controllability of the proposed NC machine tool is demonstrated.

关键词： computer numerical control Force control Force feedback Surface finishing Force measurement Controllability Feedback loop Robots Shape Control systems

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Electrical Resistivity & Thermal Stability of Smooth Silver Thin Film for Nanoscale Optoelectronic Devices

Electrical Resistivity & Thermal Stability of Smooth Silver ...

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IEEE Conference on Nanotechnology

作者： V.J. Logeeswaran A. Katzenmeyer M. Saif Islam Nobuhiko P. Kobayashi W. Wu P. Chaturvedi Nicholas Fang S.Y. Wang R. Stanley Williams Department of Electrical & Computer Engineering Kemper Hall University of California at Davis Davis CA USA Baskin School of Engineering University of California Santa Cruz CA USA Nanostructured Energy Conversion Technology and Research (NECTAR) Santa Cruz and NASA Ames Research Center Moffett Field Santa Cruz CA Department of Mechanical Science & Engineering University of Illinois Urbana IL USA Advanced Studies Hewlett-Packard Laboratories Palo Alto CA USA Information and Quantum Systems Laboratories Advanced Studies Hewlett-Packard Laboratories Palo Alto CA USA

We discuss the electrical resistivity and thermal stability of smooth thin silver (Ag) films characterized by significantly lower root mean square (RMS) surface roughness, peak-to-valley height distribution, and grain-size distribution. The smooth film was prepared by using a very thin ( ~ 1-2 nm) nucleation layer of evaporated germanium (Ge) prior to Ag evaporation. The sheet resistance of the rough silver (10 nm Ag) film is R Ag-rough ~ 51 Omega/sq compared to the smooth silver (10 nm Ag/2 nm Ge) film with R *** ~22 Omega/sq. The smooth Ag is also shown to be thermally more stable for temperatures less than 120degC.

关键词： Films Surface morphology Surface roughness Rough surfaces Resistance Thermal stability Silver

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Self-tuning control of time-varying systems based on generalized minimum variance criterion

Self-tuning control of time-varying systems based on general...

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SICE(Society of Instrument and Control Engineers)Annual Conference, SICE 2007

作者： Patete, Anna Furuta, Katsuhisa Tomizuka, Masayoshi Department of Advanced Multidisciplinary Engineering Tokyo Denki University Saitama Japan Department of Computer and Systems Engineering Tokyo Denki University Saitama Japan Department of Mechanical Engineering University of California CA United States

ISBN: (纸本)4907764286

Important issues on self-tuning control include stability, performance and convergence of the recursive algorithm involved. Based on a Lyapunov function, this paper proves the stability of a self-tuning control combining recursive controller parameters estimation considering a forgetting factor and a generalized minimum variance criterion for timevarying systems. The main result is the theorem which assures the overall stability for the closed-loop system. The system parameters are considered to be changing continuously but slowly or change abruptly but infrequently. © 2007 SICE.

关键词： Sliding mode control

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Isomorphic structure of graphs with the maximum number of trees

Isomorphic structure of graphs with the maximum number of tr...

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作者： Ido, Hideshi Ohama, Yosuke Omatu, Sigeru Electrical Engineering and Computer Science Niihama National College of Technology Niihama Ehime 792-8580 Japan Advanced Engineering Course Niihama National College of Technology 7-1 Yagumo Niihama Ehime 792-8580 Japan Computer and Systems Sciences Graduate School of Engineering Osaka Prefecture University Sakai Osaka 599-8531 Japan

ISBN: (纸本)9784990288013

Two graphs GA and GB with the same number of nodes n and the same number of branches b are said to be isomorphic if these graphs have the same adjacency relations between nodes. We have got many graphs with the same maximum number of trees in the process of continuous branch additions. These graphs have same numbers of nodes n, branches b and trees t. We certified those graphs are isomorphic by a computer algorithm. This algorithm is based on permutations of nodes with the same degree in a sequence of node degrees. Examples of isomorphic graphs are presented in the process of adding branches one by one. If two graphs with same numbers of nodes n and branches b are isomorphic, these graphs have same numbers of trees. The further problem will be to prove the reverse condition. ©ISAROB 2007.

关键词： Graphic methods

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Self-tuning control based on generalized minimum variance criterion

Self-tuning control based on generalized minimum variance cr...

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作者： Patete, Anna Furuta, Katsuhisa Tomizuka, Masayoshi Department of Advanced Multidisciplinary Engineering Tokyo Denki University Hatoyama-cho Hiki-gun Saitama 350-0394 Japan Department of Computer and Systems Engineering Tokyo Denki University Hatoyama-cho Hiki-gun Saitama 350-0394 Japan Department of Mechanical Engineering University of California Berkeley CA 94720 United States

ISBN: (纸本)9783902661296

The stability of adaptive control systems has been studied extensively for minimum phase systems, mainly for model reference adaptive systems, but complete stability proof for non-minimum phase systems have not been given. In this paper, the stability of two types of self-tuning controllers for discrete time minimum and non-minimum phase plants is studied, namely: recursive estimation of the implicit self-tuning controller parameters based on generalized minimum variance criterion (REGMVC), and another based on generalized minimum variance criterion - β equivalent control approach (REGMVC-β). Stability of the algorithms are proved by the Lyapunov theory. Copyright © 2007 IFAC.

关键词： Linear control systems

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Student deliverables and instruction for a senior design program course

Student deliverables and instruction for a senior design pro...

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114th Annual ASEE Conference and Exposition, 2007

作者： Conrad, James Hoch, Daniel Skinner, Frank University of North Carolina Charlotte United States IEEE ASEE Eta Kappa Nu United States Project Management Institute United States IEEE Computer Society Engineering Technology Department University of North Carolina Charlotte United States Mechanical Engineering Technology Department Industrial Solutions Department of Mechanical Engineering and Engineering Science University of North Carolina Charlotte United States Robo-Tech Systems Inc. GE Advanced Products Corp.

Nearly all of the senior design courses at the University of North Carolina at Charlotte (UNC Charlotte) were project-only courses. The Departments of Electrical and computer engineering, mechanical engineering, and engineering Technology all had students work on their projects with minimal instruction during the two semester course. Further, the students were only required to submit documentation at the end of each semester. The first semester's documentation typically looked more like a proposal than a design, and the second semester's reports often contained more sizzle than content. This level of documentation is not at all related to the documentation that students would be expected to deliver to their management or peers in industry, where format is dictated and content is paramount. Also, the instructors of a new multi-disciplinary senior design program realized that if they were to start adding instruction to the course, they would need to do so gradually to minimize any negative impressions students would have toward attending class ("There was no class lectures last semester"). This paper describes the background of the UNC Charlotte program before these curricular changes. It also describes the deliverable documents that students now submit as assignments. The results were an improved identification of project capabilities and requirements as measured using a published rubric. © American Society for engineering Education, 2007.

关键词： engineering education

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Self-tuning control of time-varying systems based on generalized minimum variance criterion

Self-tuning control of time-varying systems based on general...

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SICE Annual Conference

作者： Anna Patete Katsuhisa Furuta Masayoshi Tomizuka Department of Advanced Multidisciplinary Engineering Tokyo Denki University Saitama Japan Department of Computer and Systems Engineering Tokyo Denki University Saitama Japan Department of Mechanical Engineering University of California CA USA

ISBN: (纸本)4907764278

Important issues on self-tuning control include stability, performance and convergence of the recursive algorithm involved. Based on a Lyapunov function, this paper proves the stability of a self-tuning control combining recursive controller parameters estimation considering a forgetting factor and a generalized minimum variance criterion for time- varying systems. The main result is the theorem which assures the overall stability for the closed-loop system. The system parameters are considered to be changing continuously but slowly or change abruptly but infrequently.

关键词： Control systems Time varying systems Sliding mode control Parameter estimation Recursive estimation Stability criteria Variable structure systems Resonance light scattering systems engineering and theory mechanical engineering

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The Design and Development of a Through-the-Road Parallel Diesel Electric Hybrid

The Design and Development of a Through-the-Road Parallel Di...

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IEEE Conference on Vehicle Power and Propulsion (VPPC)

作者： Matthew Young G. Marshall Molen David Oglesby Kyle Crawford Kennabec Walp Ron Lewis Christopher Whitt Stephen Phillips Department of Electrical and Computer Engineering and research assistants at the Center for Advanced Vehicular Systems Mississippi State University Starkville MS USA DTI Ergon Distinguished Professor of Electrical and Computer Engineering and the Leader for Vehicular Systems Integrationat the Center for Advanced Vehicular Systems Mississippi State University Starkville MS USA Mechanical Engineering coteam leaders of the Mississippi State University Challenge X team and are research assistants at the Center for Advanced Vehicular Systems Mississippi State University Starkville MS USA Chemical Engineering and a research assistant at the Center for Advanced Vehicular Systems Mississippi State University Starkville MS USA

Mississippi State University students in their third year of Challenge X competition have transformed a 2005 Chevrolet Equinox into a diesel-electric hybrid at a 99% buy-off vehicle readiness level. The vehicle, configured in a charge sustaining, through-the-road parallel architecture, offers significant improvements over the stock vehicle with a 45% increase in fuel economy and a 3.5% increase in 0-60 mph acceleration, while maintaining a Tier 2 Bin 8 EPA emissions rating with an impressive towing capacity of 2500 lbs. The MSU Equinox utilizes a 1.9 L diesel engine burning B20 biodiesel fuel with a six-speed manual transmission that is augmented by an ac induction electric motor-transaxle assembly. A nickel metal hydride (NiMH) battery pack provides sufficient energy storage to accomplish peak shaving so that the engine operates in its most efficient regime. Optimal vehicle performance was achieved with the powertrain system analysis toolkit (PSATtrade) and MATLABtrade that facilitated the design of an advanced vehicle architecture and control strategy to reduce energy consumption and emissions. Simulation results are compared with actual experimental data obtained on a four-wheel chassis dynamometer and road tests so as to validate the mathematical model. These studies together with several documented vehicle improvements bring the MSU Equinox to a 99% buy-off readiness level so as to comply with competition requirements.

关键词： Vehicles Diesel engines Parallel architectures Fuel economy Acceleration Biofuels Assembly Nickel Batteries Energy storage

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Modeling of Light Propagation through Biological Tissues: A Novel Approach

Modeling of Light Propagation through Biological Tissues: A ...

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Frontiers in the Convergence of Bioscience and Information Technologies, FBIT

作者： Chintha C. Handapangoda Malin Premaratne Leslie Yeo James Friend Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia Micro/Nanophysics Research Laboratory (MNRL) Department of Mechanical Engineering Monash University Clayton VIC Australia

An efficient numerical technique for modeling biological tissues using the radiative transfer equation is presented. Time dependence of the transient radiative transfer equation is approximated using Laguerre expansion. Azimuthal angle is discretized using the discrete ordinates method and the resulting set of ordinary differential equations is solved using the Runge-Kutta-Felhberg method.

关键词： Biological system modeling Optical propagation Biological tissues Equations Biology computing Laboratories Numerical models Azimuthal angle Optical scattering Cancer detection

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