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 41576 - 41600 of 73969

Uncertainty Budgets For Realisation of Scales By Radiation Thermometry

March 1, 2003
Author(s)
J Fischer, M Battuello, M Sadli, M Ballico, S N. Park, P Saunders, Y Zundong, B. Carol Johnson, E Van der Ham, W Li, F Sakuma, Graham Machin, N Fox, S Ugur, M Matveyev
Some recent international comparisons and the preliminary results of the key comparison CCT-K5 evidenced that the realisation of theITS-90 above the freezing point of silver and its dissemination with tungsten strip lamps may be less straightforward than

What Is the Best Transfer Standard for Gas Flow?

March 1, 2003
Author(s)
John D. Wright
National metrology institutes around the world have embarked on an effort to compare their primary gas flow standards under the supervision of the Comit International des Poids et Mesures and its Working Group on Fluid Flow. As the pilot laboratory for the

Ignition of Weathered and Emulsified Oils (NIST SP 995)

February 28, 2003
Author(s)
Anthony Putorti, D D. Evans, E J. Tennyson
In situ burning of oil spills has been shown to be a rapid means of removing oil from the water surface. Although fresh oil is usually easily ignited, the ability to ignite weathered oils and water-in-oil emulsions is less certain. This paper presents

Nanoscale Chemical Imaging of Polymeric Materials With Atomic Force Microscopy

February 26, 2003
Author(s)
Xiaohong Gu, Tinh Nguyen, Michael J. Fasolka, D Julthongpiput, Lei Chen, Mark R. VanLandingham, Y C. Jean, Jonathan W. Martin
Nanoscale spatial chemical information is essential to developing a molecular-level understanding of a variety of phenomena occurring at surfaces and interfaces, including adhesion, friction, and surface reactivity. Therefore, the ability to probe and

Secure Interconnections for Information Technology Systems

February 26, 2003
Author(s)
Shirley M. Radack
This bulletin summarizes NIST Special Publication 800-47, Security Guide for Interconnecting Information Technology Systems, which provides guidance for planning, establishing, maintaining, and terminating secure yet cost-effective interconnections between

Canonical Decompositions of n-qubit Quantum Computations and Concurrence

February 25, 2003
Author(s)
Stephen Bullock, G K. Brennen
The two-qubit canonical decomposition SU(4) = [SU(2) SU(2)]?[SU(2) SU(2)] writes any two-qubit quantum computation as a composition of a local unitary, a relative phasing of Bell states, and a second local unitary. Using Lie theory, we generalize this to

Smaller Circuits for Arbitrary n-qubit Diagonal Computations

February 25, 2003
Author(s)
Stephen Bullock, I L. Markov
A unitary operator U=Sj,ku j,k|j> ; 0 = j = 2n -1}. These relative phases are often required in applications.Constructing quantum circuits for diagonal computations using standard techniques requires either O(n22n) controlled-not gates and one-qubit Bloch

Model for Estimating Wear Transition Loads in Ceramics

February 19, 2003
Author(s)
S Jahanmir
The wear behavior of advanced ceramics (alumina, silicon nitride, and silcon carbide) changes as the load or the coefficient of friction is increased. This change is associated with a drastic increase in wear rate at a critical load that depends on the

Research on Site Qualifications above 1 GHz

February 18, 2003
Author(s)
Michael Windler, Dennis G. Camell
This is a summary of recent efforts conducted under the auspices of the American National Standards Institute (ANSI) Accredited Standards Committee C63, Sub-committee 1, working group 1-13.2. The main purpose of this group is to assess the applicability of

A Seven Junction Cooper Pair Pump

February 15, 2003
Author(s)
Joe Aumentado, Mark W. Keller, John M. Martinis
We have measured current-voltage curves and individual charge transfer events in single-Cooper-pair pumps. We observe clear charge pumping in units of 2e, but this behavior is accompanied by significant effects from unwanted quasiparticles.

Fingerprint Matching Using Distortion Tolerant Filters

February 13, 2003
Author(s)
Craig I. Watson, D P. Casasent
The purpose of this paper is to discuss the use of distortion tolerant filters to improve the performance of fingerprint correlation matching. Previous work has shown that correlation matching of fingerprints is susceptible to larger false alarm rates than

Comparison of Cryogenic Radiometry and Thermal Radiometry Calibrations at NIST Using Multichannel Filter Raidometers

February 7, 2003
Author(s)
Bettye C. Johnson, Steven W. Brown, Keith R. Lykke, Charles E. Gibson, G Fargion, G Meister, S B. Hooker, B L. Markham, James J. Butler
Comparison of independent measurement results allows an assessment of the accuracy of the underlying methods. In this work, four multichannel filter radiometers were calibrated using tunable laser-illuminated and lamp-illuminated integrating sphere sources

Binding and Hydrolysis of Ampicillin in the Active Site of a Zinc Lactamase

February 6, 2003
Author(s)
Morris Krauss, N. Gresh, J Antony
Binding and hydrolysis of ampicillin is described in a model active site derived from di-nuclear B.fragilis zinc lactamase. The protein binding site consists of the two zinc cations bound with a bridging hydroxide and ligands from the first-shell residues
Displaying 41576 - 41600 of 73969
Was this page helpful?