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Displaying 7326 - 7350 of 9858

Wind-Induced Peak Bending Moments in Low-Rise Building Frames

August 1, 2000
Author(s)
M Gioffre, Mircea Grigoriu, M Kasperski, Emil Simiu
We present a procedure for estimating peaks of non-Gaussian processes representing fluctuating internal forces induced by wind in low-rise building frames. The procedure is designed for inclusion in computer programs that use surface pressure data bases to

A Modular Architecture for STEP

December 1, 1999
Author(s)
Allison Barnard Feeney, David M. Price
This paper presents the current direction in the architecture of STEP (STandard for the Exchange of Product model data, ISO 10303). STEP is an international standard designed to enable the exchange of product data between heterogeneous computer systems

Tip Characterization for Dimensional Nanometrology

January 1, 1999
Author(s)
John S. Villarrubia
Technological trends are increasingly requiring dimensional metrology at size scales below a micrometer. Scanning probe microscopy has unique advantages in this size regime, but width and roughness measurements must be corrected for imaging artifacts. This

Analytical/Experimental Study of Vibration of a Room-Sized Airspring-Supported Slab

March 1, 1998
Author(s)
H Amick, B Sennewald, E C. Teague, Brian R. Scace
This paper reports the results of the finite element analysis and in-situ testing of a large-scale (4 m x 10 m) pneumatically isolated concrete slab are reported. The slab was constructed as a design prototype for next generation metrology laboratories at

Vibration of a Room-Sized Airspring-Supported Slab

January 1, 1998
Author(s)
H Amick, B Sennewald, N C. Pardue, E C. Teague, Brian R. Scace
This paper reports the results of the finite element analysis and in situ testing of a large-scale (4 m x 10 m) pneumatically isolated concrete slab. The slab was constructed as a design prototype for next-generation metrology laboratories at the National

Migration Plan for Product Data Standards

February 1, 1996
Author(s)
Mary Mitchell, William Gruttke
… standards is that standards ease the migration from one computing environment to another. But what happens when the …

Radiation Scattered by Two Touching Spheres

June 20, 1994
Author(s)
Egon Marx
During the manufacture of powder metal, the size distribution of the metal spheres can be determined to some extent by the distribution of light scattered by the spheres while they are streaming by a laser beam. Micrographs show the presence of chains of

Development Plan: Configuration Management Systems and Services

January 1, 1990
Author(s)
Sanford P. Ressler, Susan Katz
This document describes a plan to establish configuration management systems and services to serve the needs of both international and national efforts. The National PDES Testbed was established at the National Institute of Standards and Technology (NIST)

MRI Birdcage RF Coil Resonance with Uncertainty and Relative Error Convergence Rates

October 4, 2017
Author(s)
Jeffrey T. Fong, Nathanael A. Heckert, James J. Filliben, Pedro V. Marcal, Robert Rainsberger, Karl F. Stupic, Stephen E. Russek
In a magnetic resonance imaging (MRI) system, it is necessary to excite the nuclei of a patient into coherent precession for imaging. This requires a coupling between the nuclei and a source of radio frequency (RF) power using a transmitter. To receive a

FIPS 140-3 Adopts ISO/IEC Standards

May 20, 2019
Author(s)
Kim B. Schaffer
This bulletin summarizes the information found in FIPS 140-3: Security Requirements for Cryptographic Modules which is applicable to all federal agencies that use cryptographic-based security systems to provide adequate information security for all agency

Effects of Powder Oxidation on Impact Toughness of Electron Beam Melt Ti-6Al-4V

August 25, 2017
Author(s)
Edward J. Garboczi, Enrico Lucon, William Grell, Z Loftus, Maciej Kumosa, E Solis-Ramos, Paul Predecki, E Clark
Powder quality in additive manufacturing (AM) electron beam melt (EBM) of Ti-6Al-4V components is crucial in determining the critical material properties of the end item. In this study, we report on the effect of powder oxidation on Charpy impact energy of

Policy Machine: Features, Architecture, and Specification

October 27, 2015
Author(s)
David F. Ferraiolo, Serban I. Gavrila, Wayne Jansen
The ability to control access to sensitive data in accordance with policy is perhaps the most fundamental security requirement. Despite over four decades of security research, the limited ability for existing access control mechanisms to enforce a

Toward Manufacturing System Composability Analysis: A Use Case Scenario

September 20, 2014
Author(s)
Boonserm Kulvatunyou, Evan K. Wallace, Nenad Ivezic, Yunsu Lee
One of the characteristics of a smart manufacturing system is the ability to quickly adapt to new and changing requirements. This implies that software and hardware components of the manufacturing system need to be easily composed and recomposed. In
Displaying 7326 - 7350 of 9858
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