NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 51351 - 51375 of 73697

Software Standards

October 22, 1998
Author(s)
D. Richard Kuhn, Thomas R. Rhodes, Christopher E. Dabrowski
This article describes software standards and their characteristics. Development considerations for programmers using standards are explained as well.

Vibrationally-Resolved Sum-Frequency Generation With Broad Bandwidth Infrared Pulses

October 15, 1998
Author(s)
Lee J. Richter, T Petralli-Mallow, John C. Stephenson
We present a novel procedure for vibrationally-resolved sum-frequency generation (SFG) in which a broad-bandwidth IR pulse is mixed with a narrow-bandwidth visible pulse. The resultant SFG spectrum is dispersed with a spectrograph and detected in parallel

A Wavelength Availability Restriction Protocol for Improved WDM Network Access

October 13, 1998
Author(s)
M R. Frey, T D. Ndousse, David H. Su
Future broadband communication networks are intended to accommodate dissimilar traffic classes with different negotiated qualities of service. A family of network access protocols is introduced whose members artificially restrict the number of calls from

Microwave Power Handling in Engineered Yba 2 Cu 3 O^d6-d Grain Boundaries

October 12, 1998
Author(s)
Y. M. Habib, D. E. Oates, G. Dresselhaus, M. Dresselhaus, Leila R. Vale, Ronald H. Ono
Microwave-frequency (rf) power-dependence measurements performed on thin-film Yba 2Cu 3O^d7-δ grain boundaries engineered on sapphire bicrystal substrates with misorientation angles of θ=20, 50, 100, and 240 are presented. The data are compared to

Inheritance Properties of Role Hierarchies

October 9, 1998
Author(s)
Wayne Jansen
Role Based Access Control (RBAC) refers to a class of security mechanisms that mediate access to resources through organizational identities called roles. A number of models have been published that formally describe the basic properties of RBAC. One

Role-Based Access Control Features in Commercial Database Management Systems

October 9, 1998
Author(s)
Ramaswamy Chandramouli, R. Sandhu
This paper analyzes and compares role-based access control (RBAC) features supported in the most recent versions of three popular commercial database management systems: Informix Online Dynamic Server Version 7.2, Oracle Enterprise Server Version 8.0 and

Characterization of High-OD Ultrathin Infrared Neutral Density Filters

October 8, 1998
Author(s)
Simon G. Kaplan, Leonard M. Hanssen, Alan L. Migdall, G Lefever-Button
We have performed transmittance measurements of metal-film neutral density filters on ultrathin polymer substrates using both Fourier-transform infrared spectrometer and laser-based (3.39 mm and 10.6 mm) systems. The use of ultrathin substrates, free of

Characterization of Narrow-Band Infrared Interference Filters

October 8, 1998
Author(s)
Simon G. Kaplan, Leonard M. Hanssen
A Fourier-transform infrared (FT-IR) spectrophotometer system is used to measure the transmittance of infrared band-pass filters as a function of wavelength, temperature, and beam geometry. Measurements are performed using an f/4 beam geometry at normal

FT-IR Based Polarimeter with High-Quality Brewster-Angle Polarizers

October 8, 1998
Author(s)
Simon G. Kaplan, Leonard M. Hanssen
A Fourier transform infrared (FT-IR) spectrometer based broadband infrared polarimeter has been developed around a pair of high-quality Brewster angle polarizers. These polarizers consist of four Ge plates in a chevron geometry and have been measured to

Normal Infrared Spectral Emittance of Al 2 O 3

October 8, 1998
Author(s)
Simon G. Kaplan, Leonard M. Hanssen
We have measured the near-normal ordinary ray transmittance and reflectance of crystalline Al 2O 3 from 1.6 m to 11 m and temperatures from 296 K to 582 K. The absorptance, or emittance, is derived from 1-(T+R), where T and R are the measured transmittance

WebMetrics: A Methodology for Producing Usable Web Sites

October 6, 1998
Author(s)
Jean C. Scholtz
This work describes a methodology for designing and evaluating web sites and web applications. Our methodology is based on the premise that tools and techniques for design and evaluation must be rapid, remote, and automated in order to be useful for web

Data Representation and Handling for Large Image Browsing

October 5, 1998
Author(s)
O E. Kia, A A. Schaff, J J. Sauvola
In this paper we present results of work done on large image browsing. Advances in compression and transmission have allowed efficient usage of storage and transmission resources; however, much work needs to be done in order to integrate such concepts in

Electrical Detection of Defects in SIMOX Buried Oxides: Pipes and Precipitates

October 5, 1998
Author(s)
Peter Roitman, Monica D. Edelstein, S. J. Krause
Two defect types have been identified in the buried oxide of low dose SIMOX: conductive silicon paths through the buried oxide (pipes) and silicon precipitates in the buried oxide. Both types are caused by the same general mechanism; the tendency of the Si

A 400 nm to 2500 nm Absolute Spectral Radiance Comparison Using Filter Radiometers

October 1, 1998
Author(s)
Howard W. Yoon, Bettye C. Johnson, D Kelch, S F. Biggar, P R. Spyak
An integrating sphere source developed by MTL Systems, Inc. was calibrated for them by a commercial standards laboratory traceable to the National Institute of Standards and Technology (NIST), resulting in values of spectral radiance in the 400 nm to 2500
Displaying 51351 - 51375 of 73697
Was this page helpful?