U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 43051 - 43075 of 73779

Formation of InAs/GaAs quantum dots by dewetting during cooling

July 1, 2002
Author(s)
Richard P. Mirin, Alexana Roshko, M. van der Puijl, Andrew G. Norman
We describe a method to form InAs quantum dots on GaAs by cooling an InAs film that is deposited at high substrate temperatures. The reflection high-energy electron diffraction pattern taken after deposition of 1.9 monolayers of InAs on (100) GaAs at 540

Frequency-Domain Measurement of the Photodegradation Process of Fluorescein

July 1, 2002
Author(s)
Adolfas K. Gaigalas, Lili Wang, R F. Vogt
The frequency domain technique is applied to measure the photodegrdation rate offluorescein in aqueous solutions. The illuminating light is modulated and the changes in fluorescence from the illuminated region are detected synchronously. A constant flow

Global Response Modification Factors vs. Member Ductility-Based Modifiers

July 1, 2002
Author(s)
S K. Kunnath, Hai S. Lew, D Friis
Most building structures today are designed using the response modification factors (R-factors) given in the code for different types of structural systems. This paper examines whether ductility-based modifiers for structural members (m-factors)

Histopathologic Reaction of a Calcium Phosphate Cement for Alveolar Ridge Augmentation

July 1, 2002
Author(s)
A Sugawara, K Fujikawa, S K. Kusama, M Nishiyama, S Murai, Shozo Takagi, Laurence Chow
The objective of the present study was to evaluate the feasibility of using a calcium phosphate cement (CPC) in the reconstruction of a defective alveolar ridge in conjunction with implant placement. The CPC consisted of an equimolar amount of tetracalcium

InGaAsP Ex-situ characterization

July 1, 2002
Author(s)
Alexana Roshko, Kristine A. Bertness
An interlaboratory comparison has been undertaken of X-ray and photoluminescence measurements of InGaAsP on InP. Six 1 cm 2 specimens are being measured, with nominal photoluminescence wavelengths of 1.1, 1.3 and 1.5 υm (2 of each). Preliminary maps of the

Investigation of Morphology and Interface in Polymer Composite Thin Films

July 1, 2002
Author(s)
C. K. Chiang, Li Piin Sung, R Popielarz
Laser scanning confocal microscopy (LSCM) has been applied to examine the filler particles and their distribution in BaTiO3-polymer composite films. We have measured thin-slice images of the composite films at various depths from the film surface and

Ionization of Carbon, Nitrogen, and Oxygen by Electron Impact

July 1, 2002
Author(s)
Yong Sik Kim, J P. Desclaux
Total ionization cross sections of neutral carbon, nitrogen, and oxygen atoms by electron impact are presented. In our theory we have included possibilities that (a) some target atoms used in an experiment were in metastable state close to the ground state

Light Scattering by Slightly Nonspherical Particles on Surfaces

July 1, 2002
Author(s)
Thomas A. Germer
We investigate the shape dependence of the scattering by dielectric and metallic particles on surfaces by considering particles whose free-space scattering properties are nearly identical. The scattering by metallic particles is very strongly dependent

Meteorological Extremes

July 1, 2002
Author(s)
Emil Simiu
This entry discusses briefly basic principles of extreme value (EV) estimation (see Extreme value analysis), the role of simulations for the development of relevant meteorological data sets, the interaction between the practical application of the

Modeling Moisture in Residential Buildings with a Multizone IAQ Program

July 1, 2002
Author(s)
Steven J. Emmerich, Andrew K. Persily, Steven J. Nabinger
Multizone airflow and contaminant transport modeling is a valuable tool for researchers and others studying indoor air quality (IAQ) problems in buildings. Although water vapor is not typically thought of as an indoor contaminant, multizone IAQ modeling

NDE of Concrete Structures Strengthened with FRP Using Infrared Thermography

July 1, 2002
Author(s)
M A. Starnes, Nicholas J. Carino, E A. Kausel
Numerical and experimental methods are used to investigate the effectiveness of infrared thermography to estimate the width of subsurface flaws in fiber-reinforce polymer (FRP) laminates bonded to concrete. The study focuses on establishing the potential

NIST Measurement Services That Support Optoelectronics

July 1, 2002
Author(s)
Sally S. Bruce, Christopher L. Cromer
The National Institute of Standards and Technology (NIST) offers a variety of hundreds of measurement services to its customers as a part of it's core mission. These services include reference data, reference materials, and physical measurements and

Nonreflecting Boundary Conditions for the Time-Dependent Wave Equation

July 1, 2002
Author(s)
Bradley K. Alpert, L Greengard, T Hagstrom
We describe a new, efficient approach to the imposition of exact nonreflecting boundary conditions for the scalar wave equation. We compare the performance of our approach with that of existing methods by coupling the boundary conditions to finite
Displaying 43051 - 43075 of 73779
Was this page helpful?