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Displaying 55101 - 55125 of 73697

Test Optics Error Removal

March 1, 1996
Author(s)
Christopher J. Evans, R Kestner
Wave-front or surface errors may be divided into rotationally symmetric and nonrotationally symmetric terms. It is shown that if either the test part or the reference surface in an interferometric test is rotated to N equally spaced positions about the

Using Logic to Specify Shapes and Spatial Relations in Design Grammars

March 1, 1996
Author(s)
Scott Chase
Shape algebraic representations provide several advantages over more traditional geometric representations. The use of predicate logic formulations of shape and spatial relations provides a natural, intuitive way to extend shape representations of the

Commercial helium permeation leak standards: Their properties and reliability

February 12, 1996
Author(s)
Patrick J. Abbott, S A. Tison
Standard leaks or leak artifacts are used extensively in industrial and research environments, typically for the calibration of helium leak detectors. The most commonly used leak is the helium permeation type, which uses a glass, quartz, or polymer barrier

Migration Plan for Product Data Standards

February 1, 1996
Author(s)
Mary Mitchell, William Gruttke
A significant benefit of using standards is that standards ease the migration from one computing environment to another. But what happens when the migration if from one standard to another? The organization that led the creation of both has committed to
Displaying 55101 - 55125 of 73697
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