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NIST Authors in Bold

Displaying 30026 - 30050 of 73697

Spectroradiometric Sources

October 16, 2008
Author(s)
Howard W. Yoon, Charles E. Gibson
rth climate modeling and global impacts of particles and gases in the atmosphere are some of the studies that benefit from the use of spectroradiometers calibrated for spectral irradiance. Spectral irradiance is the optical power incident per unit area of

Spectrum of Singly-Ionized Cesium (Cs II)

October 16, 2008
Author(s)
Craig J. Sansonetti, K L. Andrew
We measured the spectrum of cesium emitted by a pulsed radio-frequency discharge in the region 1550 to 40 000 using concave grating spectrographs, Fabry-Perot interferometry, and Fourier transform spectroscopy. By varying the operating parameters of the

Speed-Measuring Device Performance Specifications: Radar Module

October 16, 2008
Author(s)
A G. Lieberman
Technical requirements and verification procedures are presented which define a baseline for acceptable traffic radar device performance. Manufacturers are encouraged to produce radar models that meet or exceed these performance specifications; equipment

Spinodal Dewetting on Chemically Patterned Substrates

October 16, 2008
Author(s)
A Sehgal, V Ferreiro, Jack F. Douglas, Eric J. Amis, Alamgir Karim
We utilize chemically patterned substrates with arrays of progressively narrower stripes (1-15 mm) to investigate the influence of pattern size on the morphology of dewetting polystyrene films. The early-stage dewetting patterns align with the substrate

SRM 1955, Homocysteine and Folate in Human Serum; Production of a New Standard Reference Material

October 16, 2008
Author(s)
Mary B. Satterfield, B C. Nelson, Lorna T. Sniegoski, Adriana Hornikova, Nien-Fan Zhang, Christine M. Pfeiffer, Michael J. Welch
Homocysteine (HCY) and folate are interrelated biomarkers for arteriosclerosis and coronary heart disease with health problems associated with increased levels of homocysteine and low levels of folate. Although many different tests for both HCY and folate

SSE- and Noise-Optimized InGaAs Radiation Thermometer

October 16, 2008
Author(s)
Howard W. Yoon, Charles E. Gibson, V B. Khromchenko, George P. Eppeldauer
For the measurements of radiance temperatures in the range from 150 ?C to 1000 ?C, low uncertainties in the temperature measurements can be achieved by using near-infrared InGaAs radiation thermometers. We describe the design and construction of the NIST

Stability of Bose-Einstein Condensates in a Kronig-Penney Potential

October 16, 2008
Author(s)
Ippei Danshita, S Tsuchiya
We study the stability of Bose-Einstein condensates with superfluid currents in a one-dimensional periodic potential. By using the Kronig-Penney model, the condensate and Bogoliubov bands are analytically calculated and the stability of condensates in a

Standards Education Roundtable

October 16, 2008
Author(s)
M H. Saunders
This article for ASTM's Standardization News answers a series of questions for an Education Roundtable. Based on the importance of standards for everyday life and the economy, it discusses the need for several types of training in standards for present and

Standards for Intravascular Brachytherapy Dosimetry

October 16, 2008
Author(s)
Christopher G. Soares
The dosimetry of intravascular brachytherapy sources is quite difficult due to the small size of the sources and the close proximity at which measurements are necessary. The development of National Standards for the dosimetry of these sources is described

Standards for Monitoring the Temperature of Earth From Space

October 16, 2008
Author(s)
Joseph P. Rice
The National Aeronautical and Spece Administration (NASA), the National Oceanic and Atmospheric Administration (NOAA), the Department of Defense (DOD), the Department of Energy (DOE), and other Government agencies have projects in which space-flight

Statistics in Small-Angle Scattering Using Area Detectors

October 16, 2008
Author(s)
J D. Barnes, T J. Prosa
This paper presents straightforward procedures that can be used to assess the statistical significance of small-angle scattering data obtained using area detectors. Such data invariably contain contributions from the Poisson character of the data

Stick Slip Contact Mechanics Between Dissimilar Materials

October 16, 2008
Author(s)
P M. McGuiggan
Measurements of the contact diameter as a function of loading between a mica surface and a silica surface (mica/silica) in air are reported. The contact mechanics results show that the interaction generally follows JKR theory. However, an additional and

STM Studies of Halide Adsorption on CU(100), CU(110) and CU(111)

October 16, 2008
Author(s)
Thomas P. Moffat
The potential dependent adsorption of chloride and bromide on the three low index copper surfaces has been examined with voltammetry and STM. At saturation coverage, ordered halide adlayers are observed on all three surfaces; (square root 2 x square root 2

Straight-edge Diffraction of Planck Radiation

October 16, 2008
Author(s)
Peter J. Mohr, Eric L. Shirley
The irradiance diffraction profile of a straight edge is given as a Taylor series in powers of the distance from the geometrical shadow boundary to any point in the profile for monochromatic radiation. The coefficients of the series, which are obtained as

Structural Behavior of Ceramics

October 16, 2008
Author(s)
Sheldon M. Wiederhorn, Lin-Sien H. Lum
In this chapter, we discussed ceramic materials, materials that by and large do not deform plastically when subjected to high stresses. Consequently, ceramics have a low toughness and are very flaw sensitive. Methods of toughening ceramics involve grain or

Structural Instability in the B2-Type Ordered Alloys: Zr(Ru,Rh) and Zr(Ru,Pd)

October 16, 2008
Author(s)
Richard M. Waterstrat, R Kuentzler
Low temperature properties of B2-type solid solutions have been measured in the quasi-binary systems Zr(Ru,Rh) and Zr (Ru,Pd). A continuous transition from brittle to ductile behavior occurs in both of these systems as the B2 phases become unstable with

Structural Studies of Biological Minerals in Dental Research

October 16, 2008
Author(s)
M Mathew, S. Takagi
The crystallography program at the American Dental Association Health Foundation, Paffenbarger Research Center, National Institute of Standards and Technology was initiated in the early 1970's to provide a broad structural basis for understanding the
Displaying 30026 - 30050 of 73697
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