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Displaying 1426 - 1450 of 7107

Testbed Development Plan: Validation and Testing System Development

April 1, 1990
Author(s)
Mary Mitchell
This document describes a plan to construct validation software tools which will be used to ensure the quality of STEP. The Validation Testing System is an integral part of an overall project to establish the National PDES Testbed at the National Institute

A Simple Means for Reducing the Risk of Progressive Collapse

December 1, 2013
Author(s)
Yihai Bao, Hai S. Lew, Fahim H. Sadek, Joseph Main
A simple debonding technique is proposed to reduce or eliminate strain localization in reinforcing bars in the region of wide flexural cracks in RC beams, and as a result enhance the resistance of RC buildings to disproportionate collapse. In this study

Control of an Automated Machining Workstation

April 1, 1987
Author(s)
Jay S. Jun, Charles R. McLean
The software architecture of the Vertical Machining Workstation (VWS) in the Automated Manufacturing Research Facility (AMRF) at the National Bureau of Standards is presented in this paper. This prototype system demonstrates flexible computer integrated

The NIST Design Repository Project

March 1, 1999
Author(s)
Simon Szykman, Ram D. Sriram, Christophe Bochenek, J Racz
… Advances in Soft Computing - Engineering Design and Manufacturing …

A versatile bilayer resist for laser lithography at 405 nm on glass substrates

October 23, 2013
Author(s)
Quandou (. Wang, Ulf Griesmann
We describe a simple bilayer photoresist that is particularly well suited for laser lithography at an exposure wavelength of 405 nm on glass substrates, which is often used for the fabrication of binary diffractive optics and computer generated holograms

Methods for Quantifying and Characterizing Errors in Pixel-Based 3D Rendering

July 1, 2008
Author(s)
John G. Hagedorn, Judith E. Terrill, Adele P. Peskin, James J. Filliben
We present methods for measuring errors in the rendering of three-dimensional points, line segments, and polygons in pixel-based computer graphics systems. We present error metrics for each of these three cases. These methods are applied to rendering with

Representing Designs With Logic Formulations of Spatial Relations

July 1, 1996
Author(s)
Scott Chase
A new method of describing designs by combining the paradigms of shape algebras and predicate logic representations is proposed. Representing shapes and spatial relations in first order predicated logic provides a natural, intuitive method of developing

Initial Model for Fires in the World Trade Center Towers

May 1, 2002
Author(s)
Ronald G. Rehm, William M. Pitts, D D. Evans, Kuldeep R. Prasad, Kevin B. McGrattan, Glenn P. Forney
Mathematical models have been used to provide an initial estimate the behavior of the fires in the twin towers of the World Trade Center (WTC) on September 11, 2001. Available photographs and videos have provided an initial estimate of the exterior damage

Influence of Silica Fume on Diffusivity in Cement-Based Materials. I. Experimental and Computer Modeling Studies on Cement Pastes

June 1, 2000
Author(s)
Dale P. Bentz, O M. Jensen, A M. Coats, Frederik P. Glasser
… Experimental and computer modeling studies are applied to determining the … is significantly greater than that predicted from the computer models, suggesting that at these very high dosages, … Diffusivity in Cement-Based Materials. I. Experimental and Computer Modeling Studies on Cement Pastes …

Non-Uniqueness in Dual-Energy CT with Beam Hardening

September 13, 2017
Author(s)
Zachary H. Levine
Purpose: The goal is to determine whether dual-energy computed tomography (CT) leads to a unique reconstruction into two basis materials. Methods and Materials: The beam hardening equation is simplified to the single voxel case. The simplified equation is

A Dimensional Inspection Planning Activity Model

January 1, 1994
Author(s)
Shaw C. Feng
This paper describes an activity model for dimensional inspection planning that bridges the gap between product design and the dimensional measurement of manufactured products. Functionally, this model specifies requirements for developing a part of a

Manufacturing Data Validation Through Simulation

October 1, 2003
Author(s)
Guodong Shao, Yung-Tsun Lee, Charles R. McLean
In order to ensure that the process plan and numerical control (NC) programs are complete and correct before jobs are released to the shop floor, manufacturing industry needs a validation system that has visualization and analysis capabilities. A prototype

Boussinesq Algorithm for Buoyant Convection in Polygonal Domains.

April 1, 1992
Author(s)
Kevin B. McGrattan, Ronald G. Rehm, Hai C. Tang, Howard R. Baum
A 2-D Boussinesq model describing heat-driven buoyant convection in a polygonal enclosure is presented. The hydrodynamics is based on the time-dependent Navier-Stokes equations with constant viscosity and thermal conductivity; no turbulence model or other

A Decomposition-Based Approach to Layered Manufacturing

January 1, 2001
Author(s)
R Janardan, I Ilinkin, J Schwerdt, Miles E. Smid, J J. Majhi, Ram D. Sriram
This paper introduces a new approach for improving the performance and versatility of Layered Manufacturing (LM), which is an emerging technology that makes it possible to build physical prototypes of 3D parts directly from their CAD models using a
Displaying 1426 - 1450 of 7107
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