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Search Publications

NIST Authors in Bold

Displaying 45876 - 45900 of 73697

Quantum Monte Carlo for Difficult Systems

February 1, 2001
Author(s)
J A. Harkless, W A. Lester, Jr.
QMC studies of the propargyl radical, C 3H 3, peroxynitrite ion, ONOO-, nitrogen atom excited state transition energy, and chromium dimer, each of which proved difficult in other electronic structure methods, are presented here. Two generalized gradient

Radiometry: Sensing the World

February 1, 2001
Author(s)
Steven W. Brown, Bettye C. Johnson, Keith R. Lykke
Light is the supreme messenger. Light tells us something about the cosmos, the make-up of our bodies, and nearly everything in between. Light carries structural information, chemical information, and information on position and speed, as well as

Relativistic Valence Bond Theory and Its Application to Metastable Xe 2

February 1, 2001
Author(s)
Svetlana A. Kotochigova, Eite Tiesinga, I Tupitsyn
We present a new version of the relativistic configuration interaction valence bond (RCIVB) method. It is designed to perform an ab initio all-electron relativistic electronic structure calculation for diatomic molecules. A nonorthogonal basis set is

Sensor-Driven Fire Model (NIST SP 965)

February 1, 2001
Author(s)
William D. Davis, Glenn P. Forney
Modern building fire sensors are capable of supplying substantially more information to the fire service than just the simple detection of a possible fire. With the increase in the number of sensors installed in buildings for non-fire purposes, it is

Simulation and Visualization Using a Remote Database

February 1, 2001
Author(s)
Michael Iuliano
The NAMT program is currently underway at the National Institute of Standards and Technology (NIST). The NAMT was initiated by the Manufacturing Engineering Laboratory (MEL) to enable and accelerate the development of standards related to the

Size Distribution and Light Scattering Properties of Test Smokes (NIST SP 965)

February 1, 2001
Author(s)
D W. Weinert, Thomas Cleary, George W. Mulholland
Measurements of particles size distributions and optical properties of smoke detector test smokes may yield a better understanding of existing detector designs and facilitate design improvements; NIST is making such measurements now on smokes produced in

Solubility of Calcium Phosphates

February 1, 2001
Author(s)
Laurence C. Chow
Solubility is one of the most important properties of calcium phosphate salts. It is the solubility that determines the direction of many reactions that involve calcium phosphates such as dissolution, precipitation, hydrolysis, and phase transformation

Technical Activities 2000 - Chemical Science and Technology Laboratory

February 1, 2001
Author(s)
Hratch G. Semerjian, W Koch
This report summarizes the research and services provided by the Chemical Science and Technology Laboratory of the National Institute of Standards and Technology for Fiscal Year 2000. The report includes: a general overview of the laboratory's activities

Texture Plus

February 1, 2001
Author(s)
Mark D. Vaudin
TexturePlus is a Win '95 or later software package that analyzes crystallographic texture in bulk and thin film specimens. The software analyzes data obtained on a powder x-ray diffractometer. The required data include an x-ray theta-2theta scan of a Bragg

The Ground and First Excited Torsional States of Acetic Acid

February 1, 2001
Author(s)
Vadim V. Ilyushin, E A. Alekseev, S K. Dyubko, S V. Podnos, I Kleiner, L Margules, G Wlodarczak, J Demaison, J Cosleou, B Mate, E N. Karyakin, G Y. Golubiatnikow, Gerald T. Fraser, R D. Suenram, Jon T. Hougen
A global fit of microwave and millimeter wave rotational transitions in the ground and first excited torsional states (vt = 0 and 1) of acetic acid (CH3COOH) is reported, which combines older measurements from the literature with new measurements from

The Influence of Mineral Admixtures on the Rheology of Cement Paste and Concrete

February 1, 2001
Author(s)
Chiara F. Ferraris, K H. Obla, R Hill
Rheological tests on cement paste were used to successfully select the type and dosage of mineral admixtures that improved concrete workability. Among the six different mineral admixtures tested, the ultra fine fly ash (UFFA), was determined to give the

Transition Probabilities and Atomic Lifetimes

February 1, 2001
Author(s)
Wolfgang L. Wiese
The Data Center on Atomic Transition Probabilities at the U.S. National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS), has critically evaluated and compiled atomic transition probability data since 1962 and

Two Dimensional Phase Diagram of Decanethiol on Au(111)

February 1, 2001
Author(s)
G Poirier, W P. Fitts, J M. White
sed on variable temperature ultrahigh vacuum scanning tunneling microscopy data, we propose a two dimensional phase diagram of monolayerdecanethiol on Au(111). Four triple point temperatures were determined: T1 at 27 C, T2 at 33 C, T3 at 35 C, and T4 at 56

When Worlds Collide - Interactions Between the Virtual and the Real

February 1, 2001
Author(s)
Sanford P. Ressler, Brian Antonishek, Quandou (. Wang, Afzal A. Godil, Keith A. Stouffer
This paper explores issues surrounding interaction with virtual (computer generated) objects which are interfaced to real world devices. In addition a virtual room corresponding to a real physical room has been created to allow collaborative meetings with

XML Representation of EXPRESS Models and Data

February 1, 2001
Author(s)
Joshua Lubell, Edward J. Barkmeyer Jr.
EXPRESS is a modeling language for use in engineering data exchange standards that combines the entity-attribute-relationship and object modeling paradigms. This paper discusses some issues we encountered when attempting to represent EXPRESS models and
Displaying 45876 - 45900 of 73697
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