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Displaying 43576 - 43600 of 74310

High-Sensitivity Coherent Anti-Stokes Raman Scattering Microscopy With Two Tightly Synchronized Picosecond Lasers

July 1, 2002

Author(s)

E Potma, D J. Jones, J X. Cheng, X. Xie, Jun Ye

We demonstrate a significant improvement in signal-to-noise ratio in coherent anti stokes Raman Scattering (CARS) spectroscopy/microscopy, using two highly synchronized picosecond Ti: sapphire lasers. A temporal jitter between the pulse trains from the two

Highly Charged Ions: Publications of the EBIT Project, 1993-2001, Atomic Physics Division, NIST, Gaithersburg, Maryland

July 1, 2002

Author(s)

John D. Gillaspy, L P. Ratliff, J R. Roberts, E Takacs

Assembled here are the publications of NIST Electron Beam Ion Trap (EBIT) project, from its inception through the end of 2001. They are grouped thematically, as indicated in the table of contents. In order to address some of the most frequently asked

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

Influence of Curing Conditions on Water Loss and Hydration in Cement Pastes With and Without Fly Ash Substitution

July 1, 2002

Author(s)

Dale P. Bentz

The proper curing of concrete is paramount to achieving desired strength and durability performance in the field. Because blending components often react at different rates from portland cement, blended cements may require that special attention be paid to

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

Kinetics and Mechanism of Hydroxyl Radical and OH-adduct Radical Reactions with Nitroxides and With Their Hydroxylamines

July 1, 2002

Author(s)

A Samuni, A Russo, J B. Mitchell, M C. Krishna, Pedatsur Neta, S Goldstein

The stable nitroxide radicals, such as 2,2,6,6-tetramethylpiperidinoxyl (TPO) and 4-OH-2,2,6,6-tetramethylpiperidinoxyl (TPL), are potent antioxidants and among the most effective non-thiol radioprotectants, although the reported rate constants of their

Lattice Statice Green's Function Method for Multiscale Modeling of Point Defects and Extended Defects in Solids

July 1, 2002

Author(s)

Vinod K. Tewary

A method for multiscale modeling of point defects such as vacnacies and interstitials at the atomistic level and extended defects such as free surfaces and interfaces at the macroscopic continuum level in a solid is described. The method is based upon the

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

Measurement and Simulation of the Indoor Air Quality Impact of Gaseous Air Cleaners in a Test Home

July 1, 2002

Author(s)

Cynthia H. Reed, Steven J. Nabinger, Steven Emmerich

Residential and commercial gaseous air cleaning technologies have not gained wide acceptance in the marketplace, in part due to the lack of performance data from field tests or simulation studies. This paper describes a field study of the performance of

Metal Powder Substrate-Assisted Laser Desorption Ionization Mass Spectrometry to Polyethylene

July 1, 2002

Author(s)

T Yalcin, William E. Wallace, Kathleen M. Flynn

This paper describes studies of matrix-assisted laser desorption ionization time-of-flight mass spectrometry of polyethylene using metal powder as the matrix where initimate polymer/matrix mixing is not necessary.

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

Nanometer-Scale Metrology: Meeting the Nanotechnology Measurement Challenges

July 1, 2002

Author(s)

Michael T. Postek

NIST is responsible to U.S. industry for developing length intensive measurement capabilities and calibration standards in the nanometer scale regime. The Nanometer-Scale Metrology Program is an integrated Manufacturing Engineering Laboratory program

Nanostructures and Biology: Some Introductory Remarks

July 1, 2002

Author(s)

M Peckerar, Michael T. Postek, Editors Chairs

Not available.

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

NIST Standard Reference Database 23 - NIST Thermodynamic and Transport Properties REFPROP, Version 7.0

July 1, 2002

Author(s)

Eric W. Lemmon, Mark O. McLinden, Marcia L. Huber

Knowledge of the thermophysical properties is essential for the evaluation of alternative refrigerants and the design of equipment using them. The REFPROP computer database from the National Institute of Standards and Technology has been one of the more

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

Observation and Analysis of the Infrared Spectra of O 2 -HF near 3950 cm -1 and O 2 -DF Near 2900 cm -1

July 1, 2002

Author(s)

W M. Fawzy, C M. Lovejoy, David Nesbitt, Jon T. Hougen

Spectra were recorded in the H-F stretching region for both O2-HF and O2-DF, using a laser difference-frequency spectrometer coupled to a slit-nozzle expansion. By varying the ratio of oxygen to carrier gas, beam temperatures ranging from 5 to 16 K could

Observation of Changes in the Atomic and Electronic Structure of Single-Crystal Yba 2 Cu 3 O 6.6 Accompanying Bromination

July 1, 2002

Author(s)

L M. Dieng, A Y. Ignalov, T A. Tyson, Mark Croft, A Dogan, C Y. Kim, Joseph Woicik, J Grow

To ascertain the role of bromination in the recovery of superconductivity in underdoped YBa 2Cu 3O 6+y (YBCO) we have performed polarized multiple-edge x-ray absorption fine structure (XAFS) measurements on normal (y nearly equal to} 0.6) and brominated

Observation of Changes in the Atomic and Electronic Structure of Single-Crystal Yba 2 Cu 3 O 6.6 Accompanying Bromination

July 1, 2002

Author(s)

L M. Dieng, T A. Tyson, Mark Croft, T Dogan, C Y. Kim, Joseph Woicik, J Grow, A Y. Ignatov

To understand the role of bromination in the recovery of superconductivity in underdoped YBCO, the spatially resolved local structural changes in brominated single crystals have been measured and compared to those in a normal crystal. In polarized x-ray

Observation of Time-Dependent Inhibited Spontaneous Emission

July 1, 2002

Author(s)

D A. Branning, Alan L. Migdall

We present the results of an experiment to observe inhibited spontaneous emission of a parametric downconverter by an optical cavity whose switching time is short compared with the round trip time of the light.

Observations of Soot in the Combustion of Methanol/Toluene Spray Flames

July 1, 2002

Author(s)

Charles T. Avedisian, Cary Presser, Ashwani K. Gupta

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