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Displaying 46326 - 46350 of 74176

Manganese(III) Biliverdin IX Dimethyl Ester: A Powerful Catalytic Scavenger of Superoxide Employing the Mn(III)/Mn(IV) Redox Couple

February 1, 2001
Author(s)
I Spasojevic, I Batinic-Haberle, R D. Stevens, P Hambright, A N. Thorpe, J Grodkowski, Pedatsur Neta, I Fridovich
A manganese(III) complex of biliverdin IX dimethyl ester, Mn IIIBVDME} 2 was prepared and characterized by elemental analysis, uv/vis spectroscopy, cyclic voltammetry, chronocoulometry, electrospray mass spectrometry, freezing-point depression, magnetic

Mass Spectrometry: Proton Affinities

February 1, 2001
Author(s)
E P. Hunter, S G. Lias
This article presents a short review for a general reader of determinations of proton affinities and basicites in the gas phase. The evaluation of the scale of proton affinities and gas phase basicities is described.

Materials Research With Neutrons at NIST

February 1, 2001
Author(s)
Ronald L. Cappelletti, Charles J. Glinka, Susan T. Krueger, Richard M. Lindstrom, Jeffrey W. Lynn, Henry J. Prask, E Prince, John J. Rush, J. Michael Rowe, Sushil K. Satija, B H. Toby, A. Tsai, Terrence J. Udovic

Measuring Antennas Above 1 GHz

February 1, 2001
Author(s)
Michael Windler, Dennis G. Camell
The techniques for EMC measurements used with antennas above 1 GHz have been gleaned from methods used at lower frequencies. The assumptions made in applying these techniques have not been completely validated. This analysis will compare antennas for use

Morphological and Phase Characterizations of Retrieved Calcium Phosphate Cement Implants

February 1, 2001
Author(s)
Shozo Takagi, Laurence C. Chow, Milenko Markovic, C D. Friedman, P D. Costantino
A self-hardening calcium phosphate cement (CPC), consisting of equimolar amounts of tetracalcium phosphate and dicalcium phosphate anhydrous, hardens when mixed with water and forms a resorbable hydroxyapatite (HA) as the end- product. The objective of

Nanomechanical Characterization of Polymers Using Scanning Probe Microscopes

February 1, 2001
Author(s)
Mark R. VanLandingham
Scanning probe microscopy (SPM) has been used to study polymeric materials with nanometer spatial resolution. Indentation methods based on SPM technology include the use of cantilever probes with an atomic force microscope (AFM), depth-sensing transducers

NIST Workshop on Reference Data for the Properties of Biomaterials

February 1, 2001
Author(s)
John A. Tesk
The needs for reference data on properties of biomaterials were identified at a workshop held at the National Institute of Standards and Technology (NIST) on July 27, 2000 and co-organized by NIST and the Society of Biomaterials. The 65 registrants from

Physics Laboratory Technical Activities 2000

February 1, 2001
Author(s)
K B. Gebbie, William R. Ott
This report summarizes research projects, measurement method development, calibration and testing, and data evaluation activities that were carried out during calendar year 2000 in the NIST Physics Laboratory. These activities are in the areas of electron

Prediction of the [Na 1/2 Bi 1/2 ] TiO 3 Ground State

February 1, 2001
Author(s)
Benjamin P. Burton, Eric J. Cockayne
The Vienna Ab-initio Simulation Package (VASP) was used to perform fully relaced, planeware psudopotential calculations of formation energies (δE V ASP) for a large number of ordered supercells in the perovskite based system NaTiO 3 - BiTiO 3, including 36

Pulsed-Laser Metrology at NIST

February 1, 2001
Author(s)
Marla L. Dowell
Lasers and laser metrology have become an important part of our daily lives. Since the inception of the first operable laser 41 years ago, there has been explosive growth in the number of new applications of laser technology; from supermarket scanners to

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
Displaying 46326 - 46350 of 74176
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