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Displaying 52026 - 52050 of 74189

Internet-Based Delivery of CAD/CAM Capability: An Industry Case Study

September 1, 1998
Author(s)
Simon Szykman, Ram D. Sriram
This paper presents a case study in the use of the Internet as a medium for exchange of information and delivery of computer-aided design and computer-aided manufacturing (CAD/CAM) capability. The case study describes collaboration among researchers and

JAVA-Based Tools for Development and Diagnosis of Real-Time Control Systems

September 1, 1998
Author(s)
William P. Shackleford, Frederick M. Proctor
The National Institute of Standards and Technology (NIST) has been using the Real-time Control System (RCS) Reference Model Architecture for building control systems based on a hierarchy of cyclically executing control modules. This paper describes the

Kinematic Fixturing with Respect to a Plane Using Contact Sensing

September 1, 1998
Author(s)
Walter W. Nederbragt, Bahram Ravani
This paper presents a method for determining the location of geometric elements that compose the external features of referencing fixtures. Since in most applications parts that are handled in robotic work-cells are on a worktable or a floor, this paper

Masked Ion Beam Lithography with Highly Charged Ions

September 1, 1998
Author(s)
John D. Gillaspy, D Parks, L P. Ratliff
Masked ion beam lithography using highly charged ions is demonstrated for the first time by producing an array of hundreds of ordered micrometer wide dots using Xe 44+ on Poly(Methylmrthacrylate) resist. At low dose exposure of the resist is incomplete and

Materials and Fracture Mechanics Assessments of Railroad Tank Cars

September 1, 1998
Author(s)
A Zahoor, G E. Hicho
This report presents a review of fracture mechanics assessments and the mechanical and fracture toughness data for four steels used in the manufacture of railroad tank cars that carry hazardous materials. Thirteen reports developed between 1975 and 1995 by

Mechanical Hardness: Atomic-Level Calculations for Diamond-Like Materials

September 1, 1998
Author(s)
D G. Clerc
Calculations of atomic-level mechanical hardness are reported for fice diamond-like materials: diamond, silica, β-silicon-carbide, β-boron-nitride, and boron phosphide. These calculations employ a hardness model based on screened electrostatics and elastic

Minimizing Error Sources in Gage Block Mechanical Comparison Measurements

September 1, 1998
Author(s)
Bryon S. Faust, John R. Stoup, Debra K. Stanfield
Error sources in gage block mechanical comparisons can range from classical textbook examples (thermal gradients, correct temperature value, and correct master value) to a completely counter-intuitive example of diamond probe tip wear at low applied force

Mission Structure for an Unmanned Vehicle

September 1, 1998
Author(s)
A Meystel, Yigal Moscovitz, Elena R. Messina
The 4-D/Real-Time Control Systems Architecture (4- D/RCS) defines a hierarchical decomposition for intelligent systems, with corresponding command and control pathways. In order to design the vehicle¿s behavior generation functions, we developed a set of

Multiple Small-Angle Neutron Scattering

September 1, 1998
Author(s)
Gabrielle G. Long, Susan Krueger, Andrew J. Allen
Over the past decade, a multiple small-angle neutron scattering (MSANS) formalism has been developed to enable researchers to derive microstructural parameters from multiply-scattered small-angle neutron data. The MSANS formalism is particularly useful in

Optical Characterization of Diffuser-Input Standard Irradiance Meters

September 1, 1998
Author(s)
George P. Eppeldauer, M Racz, Thomas C. Larason
Standard quality irradiance meters have been developed at the National Institute of Standards and Technology (NIST) to realize detector based spectral irradiance scale. The design criteria and the optical and radiometric characterization of diffuser-input

Parallel Kinematic Machine Research at NIST: Past, Present, and Future

September 1, 1998
Author(s)
Albert J. Wavering
Unchained from the confines of controller limitations, the industrial application of parallel kinematic machines in manufacturing is beginning to emerge. The launch of commercially available hexapod machine tools at the 1994 International Manufacturing

Refrigerants for the 21st Century / ASHRAE/NIST Refrigerants Conference

September 1, 1998
Author(s)
Piotr A. Domanski
The goal of the 1997 ASHRAE/NIST Refrigerants Conference was to review available air-conditioning and refrigeration options in response to ozone depletion, global warming, and technology advances. The two-day program consisted of 16 invited comprehensive
Displaying 52026 - 52050 of 74189
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