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Search Publications

NIST Authors in Bold

Displaying 42551 - 42575 of 73697

Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6 Li

October 1, 2002
Author(s)
K M. O'Hara, S L. Hemmer, M E. Granade, M E. Gehm, J E. Thomas, V Venturi, Eite Tiesinga, Carl J. Williams
We measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of 6Li. To locate the zero crossing, we monitor the decrease in temperature and atom number arising from evaporation in a CO2 laser trap as a function of

Merging Weather Data With Materials Response Data During Outdoor Exposure

October 1, 2002
Author(s)
R S. Williams, A A. Sanadi, Corey C. Halpin, Christopher C. White
As part of an outdoor exposure protocol for a studying the weathering of sealants, a full weather station was installed at the Forest Products Laboratory field test site near Madison, Wisconsin. Temperature, relative humidity, rainfall, ultraviolet (UV)

Mitigating Autogeneous Shrinkage by Internal Curing

October 1, 2002
Author(s)
M R. Geiker, O M. Jensen
The use of internal curing is seen to be a highly effective means of mitigating autogenous shrinkage in cement mortars (w/s = 0.35, 8 % silica fume). Two different sources of internal water supply are compared: 1) replacement of a portion of the sand by

Nanopowder Characterization: Challenges and Future Directions

October 1, 2002
Author(s)
Ajitkumar Jillavenkatesa, J F. Kelly
This manuscript summarizes the proceedings and conclusions of a workshop organized to address issues associated with particle size and size distribution characterization of nanaopowders. Presentations made during this workshop highlighted the strengths and

New Empirical Procedures for Improving Ab Initio Energetics

October 1, 2002
Author(s)
Karl K. Irikura
Empirical schemes are developed for correcting the energies resulting from a moderately high-level abinitio calculation. Each method involves only a few adjustable parameters, which are determined by fitting a set of 31 high-spin atomization energies

Noise-Parameter Uncertainties: A Monte Carlo Simulation

October 1, 2002
Author(s)
James P. Randa
This paper reports the formulation and results of a Monte Carlo study of uncertainties in noise-parameter measurements. The simulator permits the computation of the dependence of the uncertainty in the noise parameters on uncertainties in the underlying

Pore Size Distributions in Low-K Dielectric Thin Films From X-Ray Porosimetry

October 1, 2002
Author(s)
Hae-Jeong Lee, Christopher L. Soles, Da-Wei Liu, Barry J. Bauer, Wen-Li Wu
X-ray reflectivity has been used to determine the mass uptake of probe molecules in porous thin films supported on thick silicon wafers. The adsorption occurs by capillary condensation when the films are exposed to probe vapor at controlled partial vapor

Predissociations in the 0 u + and 1 g States of K 2

October 1, 2002
Author(s)
T Bergeman, Paul S. Julienne, Carl J. Williams, Eite Tiesinga, M R. Manaa, H Wang, P L. Gould, W C. Stwalley
Recently Wang, Gould and Stwalley showed by exciting atomic fragments that predissociation occurs in the Ig and O + u states of K2. In this study, we supplement the interpretation given in the original report with a more detaileddiscussion. The

Pulsed inductive microwave magnetometer

October 1, 2002
Author(s)
Anthony B. Kos, Thomas J. Silva, Pavel Kabos
We describe the apparatus, software, and measurement procedures for a pulsed inductive microwave magnetometer (PIMM). PIMM can measure the dynamical properties of materials used in recording heads for magnetic storage applications and it can be used as a

Real-Time Measurement of Spontaneous Antigen-Antibody Dissociation

October 1, 2002
Author(s)
S Kulin, Rani B. Kishore, Joseph B. Hubbard, Kristian Helmerson
We report observation of real-time adhesion between a monoclonal IgE antibody and its specific DNP antigen. Both molecules are immobilized on the surfaces of different polystyrene microspheres trapped by optical tweezers. Monitoring spontaneous, thermally

Research and Challenges of Multi-Scale Mechanics and Modeling

October 1, 2002
Author(s)
K P. Chong, Nicos Martys
One of the great challenges in the material sciences is to predict long term performance of materials and structures. Recent efforts have focused on linking nano/micro scalebehavior to meso-scale and macroscale behavior through computational modeling.In

Semifluorinated Aromatic Side-Group Polystyrene-Based Block Copolymers: Bulk Structure and Surface Orientation Studies

October 1, 2002
Author(s)
X Li, L Andruzzi, E Chiellini, Giancarlo Galli, Christopher K. Ober, A Hexemer, E K. Kramer, Daniel A. Fischer
Two families of narrow polydispersity poly(styrene)-based block copolymers bearing side groups containing both a phenyl ring and a para-linked semifluorinated side group were designed to produce stable low energy surfaces. The effects of the phenyl ring on
Displaying 42551 - 42575 of 73697
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