Avalanche photodiodes (APDs) are solid state devices having an internal signal gain which gives them a better signal-to-noise ratio than standard photodiodes. Although they have been studied for years, recent advances...
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ISBN:
(纸本)0819412589
Avalanche photodiodes (APDs) are solid state devices having an internal signal gain which gives them a better signal-to-noise ratio than standard photodiodes. Although they have been studied for years, recent advances in the fabrication techniques have allowed the construction of multielement arrays (up to 10 X 10) with high performance capability. This progress has resulted in increased potential for exploiting the advantages of APDs in a variety of important applications including measurements requiring fast response such as nuclear and high energy physics research, industrial nondestructive testing, medical instrumentation, and biomedical research using low energy particles. Recent experimental data characterizing APDs and APD arrays used as x-ray, particle, and low level light detectors are presented.
The conference third volume contains 63 papers dealing with the use of computers in the control rooms and the plant offices, in the management of the plant operations, in the collection, storage and distribution of pl...
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ISBN:
(纸本)1556174640
The conference third volume contains 63 papers dealing with the use of computers in the control rooms and the plant offices, in the management of the plant operations, in the collection, storage and distribution of plant information, as well as the development of advanced manufacturing and control strategies. The topics covered include simulators and simulation tools for the power and process industries;fieldbus data and utilization;multivariable controllers for delay coking unit;system design tools;dynamic control and reporting systems;DCS planning considerations;future of computing and controls;manufacturing execution systems in batch process applications;integration of control and information systems;data acquisition strategies and architectures;control system considerations for automation, upgrades and maintenance;advanced programmable logic controller applications;advanced control algorithms;batch and continuous industrial computer based processing;enhanced production in process control using PCs;CIM advances in tank farm automation technology;and computer system software for industrial computers.
An improved technique is described for segmentation of digitized grey scale image of fingerprints. Conventional approaches to the segmentation problem are apt to yield binarized images of acceptable visual clarity, bu...
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ISBN:
(纸本)0819412384
An improved technique is described for segmentation of digitized grey scale image of fingerprints. Conventional approaches to the segmentation problem are apt to yield binarized images of acceptable visual clarity, but tend to emphasize noise, which may lead to inefficiency in data compression and storage. They may be computationally intensive, which has implications on time taken for the processing of current archives. The advantages of the technique described are high visual acceptability of the resulting binary images, and speed of execution using simple computing architectures. The method makes use of a matched spatial domain high pass filter, combined with a statistical operator that attenuates noise and effects due to paper grain. Examples are presented of the use of the technique with fingerprint images of widely varying quality, and it is shown that visually acceptable results are obtained even when the original images is heavily degraded. Results after compression are described showing merits of the statistical operator.
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