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Calculations of vacancy binding energies to Cu-V complexes in FeCu alloys

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7th International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering

作者： Kulikov, DV Malerba, L Khrushcheva, OY Russian Acad Sci AF Ioffe Physicotech Inst St Petersburg 194021 Russia

ISBN: (纸本)0819453234

The binding energies of vacancies to copper-vacany clusters in ferritic alloys containing Cu are of great importance as parameters for Object Kinetic Monte Carlo (OKMC) or Rate Equation (RE) models for the prediction of Cu precipitation under irradiation. Copper-vacancy complexes created after irradiation influence the mechanic properties of irradiated steels since they are obstacles to dislocation motion and lead to hardening and embrittlement of the material. The main purpose of this work is to find an efficient computational procedure to perform the calculation of copper-vacancy complex formation energies and corresponding vacancy binding energies in bcc Fe-Cu alloys, in order to calculate a whole matrix of values, from small to large complex sizes.

关键词： Copper Iron Chemical species Monte Carlo methods algorithm development Coating Computer simulations Mechanics Motion models Nuclear physics

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ANGULAR-MOMENTUM AND BALLISTIC TRACKING

ANGULAR-MOMENTUM AND BALLISTIC TRACKING

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4TH CONF ON THE SIGNAL AND DATA PROCESSING OF SMALL TARGETS 1992

作者： KOLBE, RL Naval Research Lab. (United States)

ISBN: (纸本)0819408638

The correlation and tracking problem for ballistic objects is a major concern for the Strategic Defense Initiative (SDI). In this presentation, the use of angular momentum for gating and assignment of reports and tracks of ballistic objects is proposed. The various errors and appropriate statistical tests that could be used on angular momentum to potentially improve the tracking and correlation, multi-track hypothesis and Kalman filters are studied. The investigation is performed in earth centered inertial Cartesian coordinates for position, velocity, and acceleration in tracking, gating, and assignment. A discussion is given of a brief investigation, the theory developed, the results of numerical test, and the conclusions.

关键词： Error analysis Detection and tracking algorithms Filtering (signal processing) Data processing Signal processing Evolutionary algorithms algorithm development Defense and security Ions Nonlinear filtering

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THERMAL DESIGN METHODOLOGY OF HOT AND CHILL PLATES FOR PHOTOLITHOGRAPHY 8

THERMAL DESIGN METHODOLOGY OF HOT AND CHILL PLATES FOR PHOTO...

引用

Conference on IC Inspection, Metrology, and Process Control VIII, at the SPIE Microlithography 1994 Symposium

作者： DEWITT, DP MACK, CA NIEMOELLER, TC YETTER, G PURDUE UNIV SCH MECH ENGNW LAFAYETTEIN 47907

ISBN: (纸本)0819414913

The major requirement for hot- and chill-plate designs is that they provide repeatable and uniform process conditions thereby assuring consistent photoresist quality. A collection of feature-based thermal models has been developed to predict temperature-time histories considering plate construction features including chuck heating/cooling methods, sensor placement with a PID control algorithm, and effects due to vacuum grooves, access holes, support pins and edge-gap. These models can be used by designers and process technologists to assess new approaches, optimize current design and set performance specifications.

关键词： Optical lithography algorithm development Performance modeling Photoresist materials Sensors Thermal modeling

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LED Spectrum Measurement via Low Cost Spectrum Sensor On-a-Chip

LED Spectrum Measurement via Low Cost Spectrum Sensor On-a-C...

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Conference on Optical Sensors and Biophotonics II

作者： Chang, Cheng-Chun Chen, Chien-Chou Lin, Nan-Ting Kurokawa, Umpei Choi, Byung I. Natl Taipei Univ Technol Dept Elect Engn Taipei 106 Taiwan Nanolambda Inc Pittsburgh PA 15238 USA

ISBN: (纸本)9780819485588

Miniature spectrometers with desirable properties such as being small in size, light weight and non-fragile provide solutions to a variety of promising application. In this work, through the developed algorithms, a low-cost chip-scale spectrometer is demonstrated in particular for LED spectrum sensing, as the market of LED lights has been booming and low-cost solution for testing and monitoring LEDs spectral characteristics become essential. The developed algorithms are in two forms, namely algebraic approach and training approach. For the algebraic approach, non-negative least square method is reported useful for spectrum reconstruction of narrowband LED spectra. For the training approach, FWHM measurement and peak wavelength measurement, the two major parameters for specifying monotonic LED spectra, are reported with accuracy within 1nm.

关键词： Light emitting diodes Sensors Spectrometers Light sources algorithm development LED lighting Ocean optics Reconstruction algorithms Transmittance Optics manufacturing

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Two-dimensional control systems: Learning from implementations

Two-dimensional control systems: Learning from implementatio...

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Conference on Process Imaging for Automatic Control

作者： Duncan, SR Univ Oxford Dept Engn Sci Oxford OX1 3PJ England

ISBN: (纸本)0819438537

The design of sensing and control systems for two-dimensional industrial processes such as paper making, plastic film extrusion and metal rolling, has drawn extensively upon concepts from two-dimensional signal processing and image processing. The performance of two-dimensional control systems is discussed in terms of spatial and dynamic bandwidths and is illustrated by examples from the control of cross-directional variations on a plastic film extrusion line. By relating these bandwidths to the specification of the required quality of the finished film and typical disturbances that enter the process, specifications are developed for the design of the actuators, the sensing system and the control algorithm. It is shown that the current generation of control systems is not suitable for controlling variations over small areas of sheet, but a system which regulates over much smaller areas could be developed using recent developments in sensors and two-dimensional control algorithms. (C) 2001 SPIE and IS&T.

关键词： Control systems Actuators Critical dimension metrology Control systems design Sensors Laser induced plasma spectroscopy Sensing systems algorithm development Metals Filtering (signal processing)

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Alignment algorithms for the Thirty Meter Telescope

Alignment Algorithms for the Thirty Meter Telescope

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Conference on Ground-Based and Airborne Telescopes IV

作者： Chanan, Gary Univ Calif Irvine Dept Phys & Astron Irvine CA 92697 USA

ISBN: (纸本)9780819491459

A variety of algorithms utilized in the alignment of segmented telescopes were developed for and implemented on the Keck telescopes in the 1990s. The algorithms associated with the Keck segmented primary mirrors are very similar to those that will be used for the Thirty Meter Telescope (TMT). However, there are alignment or related wavefront measurement tasks associated with the TMT secondary and tertiary mirrors for which the corresponding Keck algorithms either did not exist or are not adequate for TMT. We discuss two particular algorithms associated with the TMT secondary and tertiary mirrors.

关键词： Thirty Meter Telescope Mirrors Telescopes Electroluminescent displays Zernike polynomials Wavefronts Wavefront sensors algorithm development Error analysis Monochromatic aberrations

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ADAPTIVE MULTISTAGE WEIGHTED ORDER STATISTIC FILTERS FOR IMAGE-RESTORATION

ADAPTIVE MULTISTAGE WEIGHTED ORDER STATISTIC FILTERS FOR IMA...

引用

CONF ON NONLINEAR IMAGE PROCESSING 2

作者： YIN, L ASTOLA, J NEUVO, Y Tampere Univ. of Technology (Finland) Tampere Univ. (Finland)

ISBN: (纸本)0819405507

In this paper multistage weighted order statistic (MWOS) filters are introduced. With the aid of threshold decomposition, it is shown that any MWOS filter in real domain corresponds to a multistage threshold logic gate, or a multilayer perceptron in binary domain, which can be viewed as another representation of a stack filter. The MWOS filter requires much fewer parameters to represent a stack filter than the truth table of the positive Boolean function. An adaptive filtering algorithm, named as constrained backpropagation (CBP) algorithm, is developed for finding the optimal MWOS filters under the mean absolute error (MAE) criterion. The CBP algorithm is the same as the backpropagation algorithm used in multilayer perceptrons except the positivity of the parameters of MWOS filters, equal to the stacking property of stack filters, is imposed. Simulation results on image restoration are provided to compare the performance of the adaptive MWOS filters and the adaptive stack filters.

关键词： Digital filtering Image filtering Nonlinear filtering algorithm development Optimal filtering Logic devices Binary data Image restoration Nonlinear image processing Error analysis

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INHERENT OPTICAL PROPERTY ESTIMATION IN OCEAN WATER USING THE ZANEVELD-WELLS algorithm 12

INHERENT OPTICAL PROPERTY ESTIMATION IN OCEAN WATER USING TH...

引用

Ocean Optics XII Conference

作者： HOLL, LJ MCCORMICK, NJ UNIV WASHINGTON DEPT MECH ENGNSEATTLEWA 98195

ISBN: (纸本)081941574X

The Zaneveld-Wells technique for determining the inherent optical properties of ocean water is based on calculating the angle-integrated moments of the radiant light field at various depths by an inversion algorithm based on the radiative transfer equation. The hypothesis is that N $PLU 1 sensors can be used to obtain N `inherent optical expansion coefficients,' A$-n$/, from which the single scattering albedo and N-1 expansion coefficients of the volume scattering function can be calculated. We have evaluated the performance and limitations of the proposed algorithm. Results from numerical testing indicate that this technique is a promising way to estimate optical properties of some ocean waters, but attempts to estimate too many expansion coefficients give spurious results for the higher-order coefficients in other cases. Recommendations are given for improving the implementation of the algorithm.

关键词： Ocean optics Scattering Sensors Error analysis Water Optical properties algorithm development Absorption Signal attenuation Radiative transfer

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Real Time Estimation of Differential Piston at the LBT 5

Real Time Estimation of Differential Piston at the LBT

引用

Conference on Ground-Based and Airborne Telescopes V

作者： Boehm, Michael Pott, Joerg-Uwe Sawodny, Oliver Herbst, Tom Kuerster, Martin Univ Stuttgart ISYS D-70569 Stuttgart Germany Max Planck Inst Astron D-69117 Heidelberg Germany

ISBN: (纸本)9780819496133

In this paper, we present and compare different strategies to minimize the effects of telescope vibrations to the differential piston (OPD) for LINC/NIRVANA at the LBT using an accelerometer feedforward compensation approach. We summarize why this technology is of importance for LINC/NIRVANA, but also for future telescopes and instruments. We outline the estimation problem in general and its specifics at the LBT. Model based estimation and broadband filtering techniques can be used to solve the estimation task, each having its own advantages and disadvantages, which will be discussed. Simulation results and measurements at the LBT are shown to motivate and support our choice of the estimation algorithm for the instrument LINC/NIRVANA. We explain our laboratory setup aimed at imitating the vibration behaviour at the LBT in general, and the M2 as main contributor in particular, and we demonstrate the controller's ability to suppress vibrations in the frequency range of 8 Hz to 60 Hz. In this range, telescope vibrations are the most dominant disturbance to the optical path. For our measurements, we introduce a disturbance time series which has a frequency spectrum comparable to what can be measured at the LBT on a typical night. We show promising experimental results, indicating the ability to suppress differential piston induced by telescope vibrations by a factor of about 5 (RMS), which is significantly better than any currently commissioned system.

关键词： Mirrors Telescopes Error analysis Device simulation Sensors algorithm development Image sensors Performance modeling Astronomical telescopes Astronomy

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ENCODING MOTION AND APPROXIMATE SEGMENTATION IN A SLICING FLOORPLAN TRESS STRUCTURE

ENCODING MOTION AND APPROXIMATE SEGMENTATION IN A SLICING FL...

引用

Conference on Digital Video Compression - algorithms and Technologies 1995

作者： SCHWEITZER, H ZHANG, YJ UNIV TEXAS RICHARDSONTX 75083

ISBN: (纸本)0819417661

A new encoding scheme for motion and approximate scene segmentation in video sequences is described. The proposed segmentation partitions the scene into variable size rectangles that can be encoded efficiently in a data structure known as `a slicing floorplan tree' in VLSI design. The motion in each rectangle is represented by size parameters. We describe experiments comparing the compactness of this encoding to motion encoding in MPEG-1, and its quality to motion estimates obtained by standard computer vision techniques. These experiments establish two facts. (1) The proposed representation is flexible enough to describe motion as accurately as the output produced by the best motion algorithms developed by computer vision researchers. (2) The proposed representation is much more compact than the representation of motion in MPEG-1.

关键词： Computer programming Image segmentation Motion estimation algorithm development Video Computer vision technology Machine vision Video coding Very large scale integration Video compression

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