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Displaying 47276 - 47300 of 73830

Power Measurement Standards for High-Power Lasers: Comparison Between the NIST and the PTB

October 1, 2000
Author(s)
Xiaoyu X. Li, Thomas Scott, Christopher L. Cromer, Darryl A. Keenan, Friedhelm Brandt, K. Mstl
We report the results of the first laser high-power measurement comparison between the Physikalisch-Technische Bundesanstalt (PTB, Germany), and the National Institute of Standards and Technology (NIST, USA). Laser power transfer standards were calibrated

Privilege Management of Mobile Agents

October 1, 2000
Author(s)
Wayne Jansen, Athanasios T. Karygiannis
Most mobile agent systems use internal data structures within an agent to control and specify its security requirements and properties. These structures typically contain authorization information regarding access to computational resources on distributed

Radiometric Calibration History of MOBY/NIST Single Channel Dual Mode Radiometers

October 1, 2000
Author(s)
Bettye C. Johnson, Steven W. Brown, Howard W. Yoon
In 1996, the National Institute of Standards and Technology (NIST), with the support of the National Atmospheric and Oceanic Administration (NOAA), designed and built two single channel, dual mode radiometers. The radiometers are used to assess the

Radiometric Characterization and Calibration of the Marine Optical System (MOS) for the Marine Optical Buoy (MOBY) Project

October 1, 2000
Author(s)
C Habauzit, Steven W. Brown, Keith R. Lykke, B. Carol Johnson, M Yarbrough, M Feinholz, D K. Clark
The scientific objective of the Marine Optical Buoy (MOBY) project is to measure the downwelling spectral irradiance, E d, and the upwelling spectral radiance, L u, at various depths in the ocean. From these measurements, other quantities can be derived

Reinforcement of a Self-Setting Calcium Phosphate Cement with Different Fibers

October 1, 2000
Author(s)
Hockin D. Xu, F Eichmiller, Anthony A. Giuseppetti
A water-based calcium phosphate cement (CPC) has been used in a number of medical and dental procedures due to its excellent osteoconductivity and bone replacement capability. However, the low tensile strength of CPC prohibits its use in many unsupported

Resummation of Nonalternating Divergent Perturbative Expansions

October 1, 2000
Author(s)
U Jentschura
A procedure for the resummation of nonalternating divergent perturbation series is described. The prescription combines the Borel transformation with Pade approximations and a special integration contour for the evaluation of a generalized Borel integral

Role of Particles in the Inhibition of Premixed Flames by Iron Pentacarbonyl

October 1, 2000
Author(s)
M D. Rumminger, Gregory T. Linteris
Laser light scattering has been used to investigate particle formation in Fe(CO)5-inhibited premixed flames in order to understand the influence of metal and metal oxide condensation on flame inhibition. In premixed CH4-air flames, particles form early in

SANS Study of Sulfonate End Group Effect on Polystyrene Self-Diffusion

October 1, 2000
Author(s)
S D. Kim, A Klein, L H. Sperling, E M. Boczar, Barry J. Bauer
Film formation from a latex involves interdiffusion of the polymer chains. The interdiffusion behavior of polystyrene with H-ends, one sulfite-end, and two sulfite-ends are compared via small-angle neutron scattering (SANS) and a direct nonradiative energy

Scanning Near-Field Infared Microscopy and Spectroscopy with a Broadband Laser Source

October 1, 2000
Author(s)
Chris A. Michaels, Lee J. Richter, Richard R. Cavanagh, Stephan J. Stranick
Near-field scanning optical microscopy (NSOM) is a powerful tool for the characterization of the optical properties of nanoscale objects, although pervasive artifacts often create difficulties in image interpretation. A three dimensional scanning NSOM

Scanning Near-Field Infrared Microscopy and Spectroscopy With a Broadband Laser Source

October 1, 2000
Author(s)
Chris A. Michaels, Stephan J. Stranick, Lee J. Richter, Richard R. Cavanagh
A scanning near-field microscopy that allows the fast acquisition of mid-infrared absorption spectra is described. The microscope couples the nanoscale spatial resolution of a scanning probe microscope with the chemical specificity of vibrational

SQUIDs Past, Present, and Future: A Sympsium in Honor of Jim Zimmerman

October 1, 2000
Author(s)
Richard L. Kautz
The symposium on SQUIDs Past, Present, and Future was held at the National Institute of Standards and Technology in Boulder, Colorado on November 15, 1997 to celebrate the career of James E. Zimmerman. As a member of a team at the Ford Scientific

Standardization of Reflectance Colorimetry for Manufactured Products

October 1, 2000
Author(s)
Maria E. Nadal, E A. Early
The National Institute of Standards and Technology is conducting a study to advance the science of characterizing and modeling the appearance characteristics of coatings. This paper briefly describes two projects in the area of reflectance colorimetry

Striations in YIG Fibers Grown by the Laser-Heated Pedestal Method

October 1, 2000
Author(s)
H. Lim, R. C. Demattei, R. S. Feigelson, Kent B. Rochford
Yttrium iron garnet (YIG) single-crystal fibers of nominal composition Y 3Fe 5O 12 were grown by the laser-heated pedestal growth technique, a miniaturized float-zone process. YIG fibers in diameters ranging from 100 to 740 5m were grown at various rates

SURF III - An Improved Storage Ring for Radiometry

October 1, 2000
Author(s)
Uwe Arp, R Friedman, Mitchell L. Furst, Susan L. Makar, Ping-Shine Shaw
The National Institute of Standards and Technology (NIST) operates the newly upgraded Synchrotron Ultraviolet Radiation Facility (SURF III) mainly as a light source for radiometry. SURF III provides continuum radiation from the far infrared to the soft X

Tensile Strength of an Interlocking Composite Connection

October 1, 2000
Author(s)
Dat Duthinh
Twenty-four tests of an interlocking fiber-reinforced polymer (FRP) connection show that, although the connection is much weaker than the theoretical strength of the panel under the same type of load (in-plane tension transverse to the main reinforcement

The Effect of Changing Molecular End Groups on Surface Properties: Synthesis and Characterization of Poly (Styrene-b-Semifluorinated Isoprene) Block Copolymers With -CF 2 H End Groups

October 1, 2000
Author(s)
T Hayakawa, J G. Wang, M Xiang, X Li, M Ueda, Christopher K. Ober, Jan Genzer, E Sivaniah, E J. Kramer, Daniel A. Fischer
Poly(styrene-b-semifluorinated isoprene) block copolymers with -CF 2H terminated side groups were synthesized by the esterification reaction of a poly(styrene-b-hydroxylated 1,2-/3,4-isoprene) block copolymer with semifluorinated acid chlorides. Two

The FERET Evaluation Methodology for Face-Recognition Algorithms

October 1, 2000
Author(s)
P J. Phillips, H Moon, S A. Rizvi, P J. Rauss
Two of the most critical requirements in support of producing reliable face-recognition systems are a large database of facial images and a testing procedure to evaluate systems. The face Recognition Technology (FERET) program has addressed both issues

The Reaction of BF 3 with H 2 O Infrared Spectrum of BF 2 OH Trapped in Solid Neon

October 1, 2000
Author(s)
Marilyn E. Jacox, Karl K. Irikura, Warren E. Thompson
When a Ne:BF 3 sample is passed through a long stainless steel deposition line before being frozen onto a cryogenic observation surface maintained at approximately 5 K, the infrared spectrum of the resulting deposit includes prominent absorptions assigned

The Ultra-Small-Angle X-Ray Scattering Instrument on UNICAT at the APS

October 1, 2000
Author(s)
Gabrielle G. Long, Andrew J. Allen, J Ilavsky, P R. Jemian, P Zchack
A new ultra-small-angle X-ray scattering (USAXS) instrument has been commissioned as part of the UNICAT facility on the 33-ID line at the Advanced Photon Source. The instrument offers continuously-tunable optics for anomalous USAXS, 1000 times the
Displaying 47276 - 47300 of 73830
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