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Displaying 43851 - 43875 of 74045

Planning Report 02-1: The Economic Impact of Role-Based Access Control

March 1, 2002
Author(s)
Michael P. Gallaher, Alan C. O'Connor, Brian Kropp, Gregory C. Tassey
The National Institute of Standards and Technology (NIST) began working on RBAC in the early 1990s after a study of federal agency security needs identified the need to develop a better method for managing large networked systems and complex access issues

Promoting Quality in Laboratory Testing

March 1, 2002
Author(s)
J H. Pielert
The Cement and Concrete Reference Laboratory (CCRL) provides laboratory inspection and proficiency sample programs that are used to evaluate testing laboratory competency. CCRL, which is sponsored by ASTM, along with the American Association of State

Quantum Efficiency of Spectral UV on Polyurethanes

March 1, 2002
Author(s)
Tinh Nguyen, Jonathan W. Martin, E Byrd, E Embree
Polyurethanes (PU) are used extensively as exterior building materials. However, PU undergoes degration during outdoor exposure. The quantum efficiency of spectral UV on photodegration of an acrylic-urethane coating has been investigated. Samples of

Quantum Encounters of the Cold Kind

March 1, 2002
Author(s)
K Burnett, Paul S. Julienne, Paul D. Lett, Eite Tiesinga, Carl J. Williams
Ultra cold atomic collisions have a broad impact in experimental and theoretical atomic physics. These encounters occur in a domain where the quantum mechanical aspects of the interacting particles are manifest, since the de Broglie wavelength is enormous

Radiocarbon Measurements of Black Carbon in Aerosols and Ocean Sediments

March 1, 2002
Author(s)
C A. Masiello, David L. Urban, Lloyd A. Currie
We report the optimization of dichromate-sulfuric acid oxidation for the measurement of radiocarbon in black carbon (BC). We also present comparisons of black carbon 14C measurements on NIST aerosol ( 14C measurements on NIST aerosol (Urban Dust) standard

Rare-Earth Garnets and Perovskites for Space-Based ADR Cooling at High T and Low H

March 1, 2002
Author(s)
T T. King, B A. Rowlett, R A. Ramirez, E R. Canavan, M J. DiPirro, J S. Panek, J G. Tuttle, Robert D. Shull, R A. Fry
Future NASA satellite detector systems must be cooled to the 0.1K temperature range to meet the stringent energy resolution and sensitivity requirements demanded by mid-term astronomy missions. The development of adiabatic demagnetization refrigeration

Reaction Kinetics of 2-Propanol Dehydration in Supercritical Water

March 1, 2002
Author(s)
V I. Anikeev, A Ermakova, Jeffrey A. Manion, Robert E. Huie
A study of the kinetics and mechanism of chemical reactions in supercritical fluids is considered. An experimental procedure was proposed for examining reversible chemical reactions in supercritical water. The reaction kinetics of 2-propanol dehydration in

Spontaneous Emission in Microcavity Electrodynamics

March 1, 2002
Author(s)
A Rahmani, Garnett W. Bryant
We present a general, semimicroscopic, self-consistent treatment of spontaneous emission for a two-level atom in a dielectric microcavity with arbitrary shape. Both lossless and absorbing media are considered. Our spherical and cubic cavities. We discuss

Standard Reference Material 1749: Au/Pt Thermocouple Thermometer

March 1, 2002
Author(s)
Dean C. Ripple, G W. Burns
Standard Reference Material (SRM) 1749 is a lot of 18 specially-constructed gold versus platinum (Au/Pt) thermocouple thermometers, each calibrated on the International Temperature Scale of 1990 (ITS-90) and supplied with integral lead wires and a

Studies of Intensity Noise at Synchrotron Ultraviolet Radiation Facility III

March 1, 2002
Author(s)
Uwe Arp, Thomas B. Lucatorto, K Harkay, K Kim
Suppression of beam instabilities has become an important goal at synchrotron radiation light sources, where highly sensitive applications like metrology, Fourier--transform spectroscopy and microscopy are now in use. We describe measurements connecting

Subfemtosecond Timing Jitter Between Two Independent, Actively Synchronized Mode-Locked Lasers

March 1, 2002
Author(s)
R K. Shelton, S M. Foreman, L -. Ma, John L. Hall, H C. Kapteyn, M M. Murnane, M Notcutt, Jun Ye
With the implementation of a bandwidth servo, along with improved laser construction and associated better passive stability, we have achieved sub-femtosecond relative timing jitter between two independent, actively synchronized, mode-locked Ti-sapphire

Surfactant-Assisted Atomic-Level Engineering of Spin Valves

March 1, 2002
Author(s)
H D. Chopra, D X. Yang, P J. Chen, William F. Egelhoff Jr.
Surfactant Ag was successfully used to atomically engineer interfaces and nanostructure in NiO-Co-Cu based bottom spin valves. DC magnetron sputtered Co (3.0nm)/Cu (1.5 nm)/Co (2.5 nm)/NiO (50nm) bottom spin valves were studied with and without Ag as a

Synchrotron Ultraviolet Radiation Facility SURF III

March 1, 2002
Author(s)
Uwe Arp, Charles W. Clark, Alex P. Farrell, E Fein, Mitchell L. Furst, Edward W. Hagley
The National Institute of Standards and Technology (NIST) has operated the Synchrotron Ultraviolet Radiation Facility (SURF) continuously since the early 1960s. The original accelerator was converted into a storage ring, called SURF II, in 1974. Then in

The DUC Summarization Evaluations

March 1, 2002
Author(s)
Donna K. Harman, Paul D. Over
There has been a long history of research in text summarization by both the text retrieval and the natural language processing communities, but evaluation of this research has always presented problems. In 2001 NIST launched a new text summarization
Displaying 43851 - 43875 of 74045
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