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NIST Authors in Bold

Displaying 34351 - 34375 of 73697

Pseudo-Exhaustive Testing for Software

April 28, 2006
Author(s)
David R. Kuhn, Vadim Okun
Pseudo-exhaustive testing uses the empirical observation that, for broad classes of software, a fault is likely triggered by only a few variables interacting. The method takes advantage of two relatively recent advances in software engineering: algorithms

Inertance Tube Optimization for Pulse Tube Refrigerators

April 27, 2006
Author(s)
Ray Radebaugh, Michael A. Lewis, Ercang Lou, John M. Pfotenhauer, G. F. Nellis, L. F. Schunk
The efficiency of regenerative refrigerators is generally maximized when the pressure and flow are in phase near the midpoint of the regenerator. Such a phase relationship minimizes the amplitude of the mass flow for a given acoustic power flow through the

Regenerator Operation at Very High Frequencies for Microcryocoolers

April 27, 2006
Author(s)
Ray Radebaugh, Agnes A. O'Gallagher
The size of Stirling and Stirling-type pulse tube cryocoolers is dominated by the size of the pressure oscillator. Such cryocoolers typically operate at frequencies up to about 60 Hz for cold-end temperatures above about 60 K. Higher operating frequencies

Structure/Property Relationships in Urethane Dimethacrylate-Based ACP Composites

April 26, 2006
Author(s)
William Regnault, Tonya Icenogle, Joseph M. Antonucci, Da-Wei Liu, Drago Skrtic
In this study, the effects of two comonomers (the low molecular mass, hydrophilic 2-hydroxyethyl methacrylate (HEMA) vs. the high molecular mass, less hydrophilic, more flexible polyethyleneglycol extended UDMA (PEG-U)) on the PS, PSD and DC were assessed

The Effects of Small Metal Additions (Co, Cu, Ga, Mn, Al, Bi, Sn) on the Magnetocaloric Properties of the Gd 5 Ge 2 Si 2 Alloy

April 26, 2006
Author(s)
Robert D. Shull, Virgil Provenzano, Alexander J. Shapiro, A Fu, M W. Lufaso, E Karapetrova, G Kletetschka, V Mikula
It was shown that adding one atomic percent Fe to Gd5Ge2Si2 greatly reduced its large hysteresis losses, broadened the magnetic entropy change, ?Sm, versus temperature, T, peak, and shifted the ?Sm peak value from 275 K to 305 K[1]. The present paper

Damping of Stay-Cable Vibrations: Modeling Overview and Design Implications

April 25, 2006
Author(s)
Joseph A. Main, Nicholas P. Jones
Dampers have become widely accepted as an effective means of stay-cable vibration suppression and have been implemented on numerous bridges around the world. Dampers are typically attached to the stays transversely near the anchorages, and different types

Multiparameter Equations of State for Selected Siloxanes

April 25, 2006
Author(s)
P. Colonna, R. Nannan, A. Guardone, Eric Lemmon
The development of technical equations of state using the 12-parameter Span-Wagner functional form for four siloxanes is presented in two parts. The fluids under investigation include hexamethyldisiloxane (MM), tetradecamethylhexasiloxane (MD4M)

Quantum depletion of a soliton condensate

April 25, 2006
Author(s)
Lu Deng, Guoxiang Huang
We present rigorous results on the diagonalization of Bogoliubov Hamiltonian for a soliton condensate. Using the complete and orthonormalized set of eigenfunction for the Bogoliubov–de Gennes equations, we calculate exactly the quantum depletion of the

k=2 and Other Sometimes Hidden Assumptions in Chemical Measurement Uncertainty Intervals

April 24, 2006
Author(s)
David L. Duewer, S L. Ellison, William F. Guthrie, D B. Hibbert, C Jackson, A Kallner, Stefan D. Leigh, Reenie M. Parris, Kenneth W. Pratt, Michele M. Schantz, Katherine E. Sharpless
A recent interlaboratory study that required individual analysts to estimate uncertainty intervals for their results revealed that some experienced chemical analysts have difficulty with measurement uncertainty calculations. To help validate assumptions

The Effect of Stress Induced Anisotropy in Patterned FeCo Thin Film Structures

April 24, 2006
Author(s)
W Yu, J A. Bain, Willard C. Uhlig, John Unguris
In this work, 1 υm thick FeCeo films with -320 MPa compressive stress and FeCo/NiFe films with 600 MPa tensile stress were patterened into 5υm x 20 υm elements. The stress anisotropy resulting from patterning was measured using x-ray diffraction to be 220

Characterization of Magnetic Properties at Edges by Edge Mode Dynamics

April 21, 2006
Author(s)
Brian B. Maranville, Robert McMichael, Sudook A. Kim, Ward L. Johnson, C A. Ross, J Cheng
We have used trapped spinwave or edge modes of magnetic precession to probe the magnetic environment near magnetic film edges magnetized perpendicular to the edge. Micromagnetic models of dynamics in stripes reveal that the edge mode frequency-field

Development and Calibration of Pyroelectric Radiometer Standards at NIST

April 21, 2006
Author(s)
George P. Eppeldauer, Jinan Zeng, Leonard M. Hanssen
The reference spectral power responsivity scale of NIST is being extended from the silicon range to the infrared (IR) using pyroelectric radiometers. Two transfer standard pyroelectric radiometers have been developed at NIST. The main design consideration

High Speed Quantum Key Distribution System Supports One-Time Pad Encryption of Real-Time Video

April 21, 2006
Author(s)
Alan Mink, Xiao Tang, Lijun Ma, Anastase Nakassis, Barry J. Hershman, Joshua C. Bienfang, David H. Su, Ronald F. Boisvert, Charles W. Clark, Carl J. Williams
NIST has developed a high-speed quantum key distribution (QKD) test bed incorporating both free-space and fiber systems. These systems demonstrate a major increase in the attainable rate of QKD systems: over two orders of magnitude faster than other

Near-Field Imaging of High Frequency Magnetic Fields with Calorimetric Cantilevers Probes

April 21, 2006
Author(s)
Simone Lee, Y. C. Lee, Thomas Mitchell (Mitch) Wallis, John M. Moreland, Pavel Kabos
Calorimetric probes for near-field imaging of high-frequency (1-20 GHz) magnetic fields were fabricated by depositing patterned metal structures on micromachined, dielectric multilayer cantilevers. In the presence of high-frequency magnetic fields, the

Protecting Sensitive Information Transmitted in Public Networks

April 21, 2006
Author(s)
Shirley M. Radack
This bulletin summarizes NIST SP 800-77, Guide to IPsec VPNs, which was issued by NIST to help network architects, network administrators, security staff, technical support staff, and computer security program managers who are responsible for the technical

Unusual Magnetization Reversal in [Co/Pt]4 Multilayers With Perpendicular Anisotropy

April 21, 2006
Author(s)
X M. Cheng, Valerian I. Nikitenko, Alexander J. Shapiro, Robert D. Shull, C L. Chien
Unusual magnetization reversal of [Co(4 )/Pt(10 )]4 multilayers with perpendicular magnetic anisotropy has been revealed macroscopically by magnetometry measurements and microscopically by magneto-optical Kerr effect (MOKE) microscopy and magnetic force
Displaying 34351 - 34375 of 73697
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