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Displaying 49951 - 49975 of 73697

Time-Resolved Line Focus Acoustic Microscopy of Composites

June 1, 1999
Author(s)
Nelson N. Hsu
Acoustic microscopy has been used to measure material properties since the 1980s. The velocity of the leaky surface wave can be accurately determined from the V(z) curve which is formed by the interference between the leaky surface wave and specular

Toward Nanometer Accuracy Measurements

June 1, 1999
Author(s)
John A. Kramar, E Amatucci, David E. Gilsinn, Jay S. Jun, William B. Penzes, Fredric Scire, E C. Teague, John S. Villarrubia
We at NIST are building a metrology instrument called the Molecular Measuring Machine (MMM) with the goal of performing 2D point-to-point measurements with one nanometer accuracy cover a 50 mm by 50 mm area. The instrument combines a scanning tunneling

Triangulation-Based L 1 -fitting of Terrain Surfaces

June 1, 1999
Author(s)
Javier Bernal, Christoph J. Witzgall
Given a planar triangulation, the goal is to select elevations at its vertices so that resulting piecewise-linear triangulated surface approximates specified elevations using the L 1-norm as the primary measure-of-fit. Several suboptimal algorithms

Two-Dimensional Calibration Artifact and Measurement Methodology

June 1, 1999
Author(s)
Richard M. Silver, Theodore D. Doiron, William B. Penzes, S Fox, Edward A. Kornegay, S Rathjen, M Takac, D Owen
In this paper, we describe our design and the manufacturing of a two-dimensional grid artifact of chrome on quartz on a 6 inch by 6 inch by .250 glass blank. The design has been agreed upon by a number of SEMI participants working on a two-dimensional

Vacuum Processing Technique for Development of Primary Standard Blackbodies

June 1, 1999
Author(s)
Magdalena Navarro, Sally Bruce, B. Carol Johnson, A V. Murthy, Robert D. Saunders
Blackbody sources with nearly unity emittance that are in equilibrium with a pure freezing metal such as gold, silver, or copper are used as primary standard sources in the International Temperature Scale of 1990 (ITS-90). Recently, a facility using radio

High Accuracy High Speed Gaussian Filter in Surface Metrology

May 31, 1999
Author(s)
Y B. Yuan, Jun-Feng Song, Theodore V. Vorburger
Both (1+x^2)^(-n) and (sin x/x)^n functions are very close to the Gaussian distribution for large value of n. Based on these functions, two new algorithms are developed for designing high accuracy and high speed recursive type Gaussian digital filters. The

Conference Report on the Workshop on Electronic Commerce of Component Information

May 30, 1999
Author(s)
James A. St Pierre, Curtis H. Parks, Bryan C. Waltrip
This report provides an overview of a recent workshop held at NIST in Gaithersburg, July 15-17th on Electronic Commerce of Component Information. The report summarizes the discussions following the workshop's panel sessions and the plans for follow-on work

Update on a Consumer-Oriented Guide for Surge Protection

May 27, 1999
Author(s)
Francois D. Martzloff, T. S. Key, D. Nastasi, K. O. Phipps, J. May
Caught among contradictory stories on the need for surge protection as well as unsupported anecdotes of surge-related failures found in some editorial advertising, the typical consumer is in a quandary on how to est allocate personal resources to protect

Computer Attacks: What They Are and How to Defend Against Them

May 26, 1999
Author(s)
Peter M. Mell
Although a host of technologies exists to detect and prevent attacks against computers, a human must coordinate responding to a successful network penetration. At the same time, the majority of systems administrators are not prepared to handle a

Equating Laboratories: Modelling and Analysis

May 24, 1999
Author(s)
D L. Banks, K Eberhardt
Efficient world trade requires that manufacturers in one country have confidence that their product will meet specifications that are verified by purchasers in another country. But these trading partners rely upon different national metrology laboratories

Cyanate Ester Clay Nanocomposites: Synthesis and Flammability Studies

May 23, 1999
Author(s)
Jeffrey W. Gilman, Richard H. Harris Jr., Douglas Hunter
New goals outlined by the U. S. Federal Aviation Administration (FAA) Advanced Fire-Safe Aircraft Materials Research Program enumerate an order-of-magnitude improvement in aircraft cabin-material fire safety. In the pursuit of improved approaches to the

Bursting Bubbles From Combustion of Thermoplastic Materials in Microgravity

May 18, 1999
Author(s)
Kathryn M. Butler
Many thermoplastic materials in common use for a wide range of applications, including spacecraft, develop bubbles internally as they bum due to chemical reactions taking place within the bulk. These bubbles grow and migrate until they burst at the surface

A Framework for Throughput and Stability Analysis of a DS-CDMA Network

May 17, 1999
Author(s)
Vladimir V. Marbukh, Nader Moayeri
We propose a framework for throughput and stability analysis of a Direct Sequence Code Division Multiple Access (DS-CDMA) network. Given chip rate, processing gains, packet structure, coding scheme, and the characteristics of the wireless channel, we

Solution of the Boltzmann Equation Without the Relaxation Time Approximation

May 15, 1999
Author(s)
David R. Penn, Mark D. Stiles
A method is presented for solving the spatially varying Boltzmann equation without the relaxation time approximation. The solution is compared with that obtained using the relaxation time approximation for free electron solids in the presence of boundaries
Displaying 49951 - 49975 of 73697
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