检索结果-内蒙古大学图书馆

Preparation of Cross Sectional TEM Samples Using Lithographic Techniques and Reactive Ion Etching

MRS Online Proceedings Library 1990年第1期199卷 43-50页

作者： Jeffrey T. Wetzel K. L. Kavanagh IBM Research Division T.J. Watson Research Center Yorktown Heights USA Advanced Products Research and Development Laboratory Motorola Inc Austin USA Department of Electrical and Computer Engineering UCSD San Diego USA

This paper summarizes methods used to create cross-sectional samples for transmission electron microscopy and introduces another variant of the technique all of which rely upon some combination of lithographic patterning and reactive ion etching. The basic idea pursued in using these techniques was to form, from a preselected location, samples that had a large transparent area without use of mechanical polishing or ion milling. Samples were successfully prepared in this manner, but room for improvement remains due to the limited range of diffraction conditions available for imaging or diffraction pattern formation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

motion planning in a dynamic domain

Motion planning in a dynamic domain

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： K. Fujimura H. Samet Center for Engineering Systems Advanced Research Oak Ridge National Laboratory Oak Ridge TN USA Center for Automation Research and Computer Science Department and Institute for Advanced Computer Studies University of Maryland College Park MD USA

motion planning is studied in a time-varying environment. Each obstacle is a convex polygon that moves in a fixed direction at a constant speed. The robot is a convex polygon that is subject to a speed bound. A method of determining whether or not there is a translational collision-free motion for a polygonal robot from an initial position to a final position and of planning such a motion, if it exists, is presented. The method makes use of the concept of configuration spaces and accessibility. An algorithm is given for motion planning in such an environment, and its time complexity is analyzed.< >

关键词： Robots motion planning Orbital robotics Robotics and automation Algorithm design and analysis Space stations systems engineering and theory Laboratories motion analysis Shape

来源：评论

学校读者我要写书评

暂无评论

Synthesis of Nonlinear Controllers with Rate Feedback via Sinusoidal-Input Describing Function Methods

Synthesis of Nonlinear Controllers with Rate Feedback via Si...

引用

American Control Conference (ACC)

作者： James H. Taylor James R. O'Donnell Control Systems Laboratory General Electric Corporate Research and Development Schenectady NY USA Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

In this paper, we report on recent advances in the design of fully nonlinear controllers for amplitude-sensitive nonlinear plants using sinusoidal-input describing function methods. This work includes the development of a new nonlinear controller synthesis approach that includes derivative action in an inner-loop feedback path (nonlinear rate feedback), and its application to a motor + load model with torque saturation and stiction. This approach is capable of treaing nonlinear systems of a very general nature, with no restrictions as to system order, number of nonlinearities, configuration, or nonlinearity type; additionally, the techniques can be generalized for the design of nonlinear controllers of different structures. The end result is a closed-loop nonlinear control system that is relatively insensitive to reference-input amplitude.

关键词： Feedback Control system synthesis Nonlinear control systems Signal synthesis Three-term control Load modeling Nonlinear systems Control systems Laboratories research and development

来源：评论

学校读者我要写书评

暂无评论

An integrated system for circuit level hot-carrier evaluation

An integrated system for circuit level hot-carrier evaluatio...

引用

Custom Integrated Circuits Conference (CICC)

作者： P.G.Y. Tsui L. Howington P.M. Lee T. Tiwald B. Mowry F.K. Baker J.D. Hayden B.B. Feaster B. Garbs Advanced Products Research and Development Laboratory Motorola Inc. Austin TX USA Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA

An integrated system designed to evaluate and predict hot-carrier effects at the circuit level is described. The system will perform device stress, collect data, extract parameters, and simulate circuit aging behavior using the circuit aging simulator from UC Berkeley. Enhancements made to the device-stress and data-analysis portions of the system were found necessary to achieve accurate circuit reliability prediction. Less than 2% error is observed between the measured and simulated performance of a 0.5 mu m ring oscillator test circuit.< >

关键词： Hot carriers Circuit simulation Stress Aging Degradation Content addressable storage Hot carrier effects Data mining Data analysis Circuit testing

来源：评论

学校读者我要写书评

暂无评论

Trends in shop floor control: modularity, hierarchy, and decentralization

Trends in shop floor control: modularity, hierarchy, and dec...

引用

IEEE International Symposium on Intelligent Control (ISIC)

作者： T.L. Johnson A.D. Baker Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA Department Electrical & Computer Engineering Rensselaer Polytechnic Institute Troy NY USA

Computational architectures for shop floor control in automated job shops and midvolume manufacturing facilities are evolving into three identifiable forms, which are contrasted here. The first architecture, termed the modular approach, is based on earlier monolithic MRP/order-release systems and is typified by recent CIM (computer-integrated manufacturing) product offerings such as GEs CIMPLICITY. The second architecture is a hierarchical architecture, such as NIST's AMRF (National Institute of Standards and Technology's Automated Manufacturing research Facility) system. The third architecture is a contract net architecture which is fully decentralized and may be a candidate for future CIM systems. These architectural forms may be distinguished on the basis of the partitioning principles which predominate in their design.< >

关键词： computer integrated manufacturing Hardware Power capacitors Local area networks Subcontracting Debugging Workstations Programmable control Cost function Software packages

来源：评论

学校读者我要写书评

暂无评论

Near-Time-Optimal Control of a Robot Manipulator using new Approximation Techniques

Near-Time-Optimal Control of a Robot Manipulator using new A...

引用

American Control Conference (ACC)

作者： Greg Heinzinger Paul Jacobs John Canny Brad Paden Department of Electrical Engineering and Computer Science and The Electronics Research Laboratory University of California Berkeley CA USA Laboratoire d'Automatique et d'Analyse des Systems Toulouse France Department of Computer Science University of California Berkeley USA Department of Mechanical Engineering and Center for Robotic Systems in Microelectronics University of California Santa Barbara CA USA

We present a new approach for determining a time-optimal trajectory for a robot manipulator with actuator torque bounds. We find an approximation to a globally optimal trajectory which passes between two configurations will avoiding obstacles. Our algorithm accomplishes this by by dynamically generating and searching a finite graph. Our algorithm is guaranted to produce a trajectory that performs within a user-specified factor of a time-optimal safe trajectory.

关键词： Robot control Manipulators computer science Torque control Jacobian matrices Actuators Algorithm design and analysis Approximation algorithms Gravity Tellurium

来源：评论

学校读者我要写书评

暂无评论

High microwave power InP MISFETs with one micron and submicron gates

High microwave power InP MISFETs with one micron and submicr...

引用

Indium Phosphide and Related Materials Conference

作者： M. Shokrani V.J. Kapoor M.D. Biedenbender L. Messick R. Nguyen Electronics Devices and Materials Research laboratory Department of Electrical and Computer Engineering University of Cincinnati Cincinnati OH USA Electronic Material Science Division Naval Ocean Systems Center San Diego CA USA

High-power microwave InP MISFETs were investigated. The gate insulator in the InP MISFET was silicon dioxide (SiO/sub 2/) with a thin (

High-power microwave InP MISFETs were investigated. The gate insulator in the InP MISFET was silicon dioxide (SiO/sub 2/) with a thin (<50 AA) silicon interfacial layer (SIL) deposited by direct plasma-enhanced chemical vapor deposition (PECVD). MIS capacitors were formed on n-type InP using the SiO/sub 2/ and the SiO/sub 2//Si gate insulators. A 1.2 V hysteresis was present in the capacitance-voltage (C-V) curve of the capacitors with SiO/sub 2/, but essentially no hysteresis was observed in the C-V curve of the capacitors with SIL incorporated in the insulator. InP power MISFETs with the SIL exhibited excellent stability with drain current drift of less than 3% in 10/sup 4/ s as compared to 15-18% drift in 10/sup 4/ s for MISFETs without SIL. MISFETs with SIL in the gate insulator had an output power density of 1.75 W/mm at 9.7 GHz with 24% power-added efficiency and an associated power gain of 2.5 dB.< >

关键词： Indium phosphide MISFETs Insulation Capacitors Hysteresis Silicon compounds Plasma chemistry Chemical vapor deposition Capacitance-voltage characteristics Stability

来源：评论

学校读者我要写书评

暂无评论

High frequency transistors on MOCVD grown InGaAs/InP

High frequency transistors on MOCVD grown InGaAs/InP

引用

Indium Phosphide and Related Materials Conference

作者： G.A. Johnson V.J. Kapoor L.J. Messick R. Nguyen R.A. Stall M. McKee Electronic Devices and Materials Research Laboratory Department of Electrical and Computer Engineering University of Cincinnati Cincinnati OH USA Naval Ocean Systems Center San Diego CA USA EMCORE Corporation Somerset NJ USA

The fabrication of InGaAs MISFETs with 1- mu m gate lengths and up to 1-mm gate widths using an ion-implanted process is reported. The devices demonstrated an output power density of 1.07 W/mm at 9.7 GHz with a corresponding power gain and power-added efficiency of 4.3 dB and 38%, respectively. A novel plasma deposited silicon/silicon oxide gate insulator was employed to achieve an output power stability within 1.2% over 24 h of continuous operation, with a corresponding drain bias current increase of less than 4%.< >

关键词： Frequency MOCVD Indium gallium arsenide Indium phosphide Power generation Plasma stability Silicon Fabrication MISFETs Plasma density

来源：评论

学校读者我要写书评

暂无评论

Time-optimal trajectories for a robot manipulator: a provably good approximation algorithm

Time-optimal trajectories for a robot manipulator: a provabl...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： G. Heinzinger P. Jacobs J. Canny B. Paden Department of Electrical Engineering and Computer Sciences and the Electronics Research Laboratory University of California Berkeley Berkeley CA USA Laboratoire d'Automatique et d'Analyse des Systemes Toulouse France Department of Computer Science University of California Berkeley CA USA Department of Mechanical Engineering and Center for Robotic Systems in Microelectronics University of California슠Santa Barbara Santa Barbara CA USA

An algorithm is presented for generating near-time-optimal trajectories for an open-kinematic-chain manipulator moving in a cluttered workspace. This is the first algorithm to guarantee bounds on the closeness of an approximation to a time-optimal trajectory. The running time and space required are polynomial in the desired accuracy of the approximation. The user may also specify tolerances by which the trajectories must clear obstacles in the workspace to allow modeling of control errors.< >

关键词： Robots Manipulators Approximation algorithms Optimized production technology Safety

来源：评论

学校读者我要写书评

暂无评论

THE COMMAND SUPPORT AT-SEA EXPERIMENT

引用

NAVAL ENGINEERS JOURNAL 1990年第3期102卷 25-36页

作者： BUSCHER, DJ SUNDAY, DM David J. Buscher:is an electrical engineer on the Principal Professional Staff of the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He earned his BS degree in electrical engineering from Villanova University in 1967 an MSEE degree from the University of Maryland in 1972 and an MS degree in technical management from The Johns Hopkins University in 1985. He was the lead engineer on the Command Support At-Sea Experiment Project. He started his career in 1967 with the U.S. Army Harry Diamond Laboratory working on computer and communications projects. During this time he worked in Vietnam with the United States Army Vietnam Science Advisor Office. Since joining JHU/APL in 1978 he has worked on a variety of projects associated with computer graphics hospital patient information systems computer networks autonomous underwater vehicles and satellite communications. He is currently assistant group supervisor of the Computer Systems Group. Daniel M. Sunday:is a mathematician on the Principal Professional Staff of the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He earned his Ph.D. in mathematics from the University of Minnesota in 1971 and did postdoctoral research on neural networks at the University of California at Berkeley. Since joining JHU/APL in 1980 Dr. Sunday has worked as a designer and developer of software systems with emphasis on medical imaging interactive graphics natural language interfaces and software standards. He was the network designer for the Headquarters Integrated Office System (HIOS) Network for the Army at the Pentagon. He is currently the lead software engineer on the Command Support At-Sea Experiment Project.

The Command Support At-Sea Experiment (CS@SE) provides experimental advanced graphics display systems consisting of large screen color displays and operator console color displays in the combat information center (CIC) of an Aegis cruiser and in the tactical flag command center (TFCC) of an aircraft carrier. CS@SE systems are designed to prototype potential command support capabilities in an at-sea environment to validate and refine requirements for planned production system upgrades. These systems use sophisticated color graphics techniques to provide real-time tactical displays that improve the availability of information to an operator by reducing clutter through the use of color, area fill, transparen overlays and intensity coding of track symbols. Interfaces wen developed with the Aegis Display System (ADS), Shipboarc Gridlock System with Auto-correlation (SGS/AC), Flag Dats Display System (FDDS) and Tomahawk Engagement Planning and Exercise Evaluation System (TEPEE) that provided the data for the presentation of a tactical display. Display elements included both real-time and over-the-horizon (OTH) surface track data, velocity leaders, tags, uncertainty ellipses, and history trails. The display also included filled land masses, country boundaries, commercial airways, cities, graphics overlays (i.e., operational areas), weapon system missile performance contours, and engagement plans. This paper describes the experiment, its installation and integration into the shipboard environments of an Aegis cruiser (USS Leyte Gulf ) and an aircraft carrier (USS America , its usage by the ships companies and embarked staffs, and the experiment result! and findings. Key conclusions of the experiment are: 1 advanced graphics color displays can significantly enhance the ability of the warfighter to assimilate a complex tactical display. 2 Both ships reported a requirement for a correlated OTH and real-time track display with the ability to clearly differentiate the two types

关键词： computer Graphics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：