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Displaying 43176 - 43200 of 73778

Contingency Planning Guide for Information Technology Systems

June 1, 2002
Author(s)
Elizabeth B. Lennon
This ITL Bulletin summarizes NIST SP 800-34, Contingency Planning Guide for Information Technology Systems. It describes the process of developing contingency plans, procedures, and technical measures that can enable a system to be recovered quickly and

Continuously Tunable Precise, Single Frequency Optical Signal Generator

June 1, 2002
Author(s)
J D. Jost, John L. Hall, Jun Ye
To realize a genuine CW optical frequency synthesizer, a continuously tunable single-frequency CW laser has been employed to track preciselyany arbitrary component of a wide bandwidth phase-stabilized optical comb. We dermnstrate in experiment two

Convective and Morphological Instabilities During Crystal Growth

June 1, 2002
Author(s)
Geoffrey B. McFadden, Sam R. Coriell, B T. Murray
During crystal growth or solidification of a binary alloy from a liquid phase, temperature and solute gradients are inherently present and can give rise to fluid flow in the melt. The interaction of fluid flow with the crystal-meltinterface plays an

Cracking in Brittle Laminates from Concentrated Loads

June 1, 2002
Author(s)
H Chai, Brian R. Lawn
A study is made of the crack resistance of multilaminates consisting of brittle layers interleaved with compliant interlayers and bonded to compliant substrates. Specific attention is paid to flexure generated radial cracks in the undersurfaces of

Crystal Structure of the Compound Bi 2 Zn 2/3 Nb 4/3 O 7

June 1, 2002
Author(s)
Igor Levin, T G. Amos, J Nino, Terrell A. Vanderah, I Reaney, C A. Randall, M T. Lanagan
The crystal structure of Bi2Zn2/3Nb4/3O7 was determined using a combination of electron, X-ray and neutron powder diffraction. The compound crystallizes with a monoclinic zirconolite-like structure (C2/c (No.15) space group, a=13.1037(9) , b=7.6735(3) , c

Data-Assisted Design for Wind Loading

June 1, 2002
Author(s)
Emil Simiu, Fahim Sadek, T Whalen, S Jang, L L. Lu, S M. Diniz, A Grazini, Michael A. Riley
Current ASCE Standard provisions on wind loads for low-rise building design are based on wind tunnel tests conducted at the University of Western Ontario in the 1970's. In spite of the advances they entailed at the time, those provisions are inadequate

Deviations in the Thermal Properties of Ultrathin Polymer Network Films

June 1, 2002
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Wen-Li Wu
X-ray reflectivity was used to characterize the electron density and rubbery expansion for cross-linked epoxy network films of various thickness adhered to silicon wafers. Reflectivity profiles from all the films were best fit by single layer model. In

Discharge of CF3I in a Cold Simulated Aircraft Engine Nacelle (NIST SP 984)

June 1, 2002
Author(s)
Jiann C. Yang, Samuel L. Manzello, Marc R. Nyden, M D. Connaghan
An aircraft engine nacelle refers to the region between the engine body and its casing. Fuel and hydraulic lines, pumps, and lubrication systems are located within the nacelle. Air is vented through the nacelle to prevent any build-up of combustible vapors

Dispersion of Functionalized Nanoclay Platelets in an Amine-Cured Epoxy Resin System

June 1, 2002
Author(s)
D T. Raghavan, E Feresenbet, D Yebassa, A Emekalam, Gale A. Holmes
Nanocomposites are a relatively new class of materials obtained by dispersing montmorillonite clay in polymer matrix. Evidences from literature suggest that clay platelet dispersion during nanocomposite preparation and clay-matrix adhesion are major

Effect of Loading Rate Upon Conventional Ceramic Microindentation Hardness

June 1, 2002
Author(s)
George D. Quinn, P J. Patel, Isabel K. Lloyd
Dynamic micro-indentation hardness was evaluated for a steel, sintered silicon carbide, and an aluminum oxynitride. There was negligible effect upon Vickers hardness when loading rate was varied by almost three orders of magnitude.

Elastic Moduli Data for Polycrystalline Oxide Ceramics

June 1, 2002
Author(s)
R G. Munro
A compilation of elastic moduli data, including Young's modulus, shear modulus, bulk modulus, and Poisson's ratio, is presented for polycrystalline oxide ceramics. The data have been collected from the technical literature, either as reported in textual or

Error Measurements and Analysis for an AC Josephson Voltage Standard

June 1, 2002
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus
The Josephson arbitrary waveform synthesizer can be used as a precision voltage source for both ac and dc signals. Recent improvements in circuit designs have have resulted in output voltages greater than 100 mV so that we can investigate ac metrology
Displaying 43176 - 43200 of 73778
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