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Search Publications

NIST Authors in Bold

Displaying 32226 - 32250 of 73929

Estimation and Testing for the Common Intersection Point

August 22, 2007
Author(s)
Andrew L. Rukhin
The problem of estimating a common intersection point from a collection of straight lines and of testing the hypothesis that such a point exists are considered. The relationship to the error-in-variables regression and to the intersection-union principle

Current status of transport properties of hydrogen

August 21, 2007
Author(s)
Jacob W. Leachman, Bryce Jacobson, Steven Penoncello, Marcia L. Huber
This paper contains an analysis of transport properties of hydrogen, particularly thermal conductivity and viscosity, which are needed for many applications in system analysis and design. It includes a review of the current standard transport property

Longitudinal Heat Conduction in Finned-Tube Evaporators

August 21, 2007
Author(s)
Piotr A. Domanski, William V. Payne, J M. Choi
The paper evaluates performance of finned-tube evaporators at different refrigerant exit superheats to assess the impact of longitudinal heat conduction on capacity.

Measurement of Reactivity Ratios in Surface-Initiated Copolymerization

August 21, 2007
Author(s)
Derek L. Patton, Kirt A. Page, Chang Xu, Kirsten Genson, Michael J. Fasolka, Kathryn L. Beers
This work describes a new approach to measure monomer reactivity ratios from surface-initiated copolymerizations using x-ray photoelectron spectroscopy. Styrene/methyl methacrylate statistical copolymer brushes were prepared from various monomer feeds by

Multiplexed microcalorimeter arrays for precision measurements from microwave to gamma-ray wavelengths

August 21, 2007
Author(s)
Joel Ullom, W.Bertrand (Randy) Doriese, James A. Beall, William Duncan, S. L. Ferreira, Gene C. Hilton, Rob Horansky, Kent D. Irwin, Terrence J. Jach, John Mates, Nathan A. Tomlin, Galen O'Neil, Carl D. Reintsema, Nicholas Ritchie, Dan Schmidt, Leila R. Vale, Yizi Xu, Barry L. Zink, Andrew Hoover, Clifford R. Rudy, Derek Tournear, Duc Vo, Michael W. Rabin
Cryogenic microcalorimeters are a promising technology for ultrasensitive measurements of electromagnetic radiation from microwave to gamma-ray wavelengths. Cryogenic microcalorimeters derive their exquisite sensitivity from the minimal thermal noise at

High Effeciency Fast Scintillators for the Development of Optical Soft X-Ray Arrays for Laboratory Plasma Diagnostics

August 20, 2007
Author(s)
L F. Delgado-Aparicio, R Vero, D Stutman, M Finkenthal, K Tritz, G Suliman, H W. Moos, R Kaita, R Majeski, B Stratton, L Roquemore, D Johnson, Charles Tarrio
Scintillator-based optical soft x-ray (OSXR) arrays may in the near future, replace the conventional diode arrays used for plasma imaging, tomographic reconstruction, magnetohydrodynamics, transport and turbulence studies in magnetically confined fusion

Mapping Cell Distribution in Amorphous Scaffolds using Confocal Microscopy

August 19, 2007
Author(s)
Jirun Sun, Nancy Lin, Marcus T. Cicerone, Sheng Lin-Gibson
One common method for probing cell-material interactions is direct visualization via confocal laser scanning microscopy, a technique widely used for studying biological systems. However, confocal microscopy has limited depth penetration for imaging cells

Current Status of Thermodynamic Properties of Hydrogen

August 17, 2007
Author(s)
Bryce Jacobson, Jacob W. Leachman, Steven Penoncello, Eric Lemmon
This paper presents a survey of the thermodynamic properties of normal hydrogen and parahydrogen with comparisons of properties calculated using the standard models to available experimental data. Motivated by the fact that the currently accepted standards

Test Methods and Knowledge Representation for Urban Search and Rescue Robots

August 17, 2007
Author(s)
Craig I. Schlenoff, Elena R. Messina, Alan M. Lytle, Brian A. Weiss, Ann M. Virts
In this paper, we described an effort in which NIST is working with FEMA Task Force members to define performance requirements and standard test methods as well as to assess the deployment potential of robots applied to the USAR domain. This process has

Spinor Dynamics in an Antiferromagnetic Spin-1 Condensate

August 16, 2007
Author(s)
A T. Black, Eduardo Gomez, Lincoln Turner, Sebastian Jung, Paul D. Lett
We observed coherent spin oscillations in an antiferromagnetic spin-1 Bose-Einstein condensate of sodium. The variation of the spin oscillations with magnetic field shows a clear signature of nonlinearity, in agreement with theoretical predictions that

Two-Phonon Infrared Spectra of Si and Ge: Calculating and Assigning Features

August 16, 2007
Author(s)
Eric L. Shirley, Hadley Lawler
Third-order density-functional perturbation theory yields the terahertz/far-infrared absorption spectra for silicon and germanium, including all two-phonon combination and difference features. Temperature-dependent spectra are compared to available

A Study of Comparability in AFLP Profiling Using a Simple Model System

August 15, 2007
Author(s)
Lina Partis, M J. Burns, Koichi Chiba, Ph Corbisier, Marcia J. Holden, J. Wang, Qing Y. Liu, Tomoya Okunishi, Sang-Ryoul Park, Maxim Vonsky, K R. Emslie
A simple AFLP model, using the relatively small bacteriophage lambda genome, was developed to test the reproducibility of this technique in an international study, CCQM-P53. Using either non-selective or selective primers, 9 fragments or a subset of 1 to 3

Collaborative Augmented Reality for Better Standards

August 15, 2007
Author(s)
Matthew L. Aronoff, John V. Messina
Concurrent engineering depends on clear communication between all members of the development process. As that communication becomes more and more complex -- including not only textual descriptions, but CAD models, diagnostic data, process control data, and

Facial Respirator Shape Analysis using 3D Anthropometric Head Data

August 15, 2007
Author(s)
Riley Fenlon
For firefighters and first response crews, the facial respirator is the first and last defense against hazardous and potentially harmful airborne agents. That defense is crippled if the seal of the respirator sprouts a leak, exposing the wearer to the

Demonstration of high-performance chip-scale magnetic shields

August 14, 2007
Author(s)
Elizabeth A. Donley, Eleanor Hodby, Leo W. Hollberg, John E. Kitching
We have designed and tested a set of five miniature nested magnetic shields constructed of high-permeability material, with volumes ranging from 0.01 to 2.5 cm^3. We present measurements of the longitudinal and transverse shielding factors (the ratio of
Displaying 32226 - 32250 of 73929
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