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Search Publications

NIST Authors in Bold

Displaying 30001 - 30025 of 73697

Scaled Born Cross Sections for Excitations of H 2 by Electron Impact

October 16, 2008
Author(s)
Yong Sik Kim
This article describes the scaling of plane-wave Born cross sections for the excitation of the H2 molecule to four low-lying electronic states (B singlet Sigma_u^+, C singlet Pi_u, B' singlet Sigma_u^+, D singlet Pi_u) by electron impact. The same BE and

Scanning Acoustic Microscopy Stress Measurements in Electronic Packaging

October 16, 2008
Author(s)
E Drescher-Krasicka, T M. Moore, T Hartfield, D Chery
Scanning acoustic microscopy has been successfully implemented for the nondestructive detection of cracks and delaminations in integrated circuit packages. In reliability tests of molded surface mount components, acoustic microscopy was instrumental in

Schlieren Imaging in Materials Processing

October 16, 2008
Author(s)
Steven P. Mates
Even before Ernst Mach used it to visualize sock waves cast by a supersonic bullet in 1888, the schlieren optical technique has been a valuable diagnostic tool in fluid mechanics, particularly int he fields of aerodynamics and heat convection, where strong

Scientific Data in the Internet Era

October 16, 2008
Author(s)
J R. Rumble
The scientific information revolution comes from the conjunction of changes in science itself with the rapid increase of computer and telecommunications power. Enormous amounts of scientific data are being generated and new database techniques are being

Second Harmonic Generation From the Si/SiO 2 Interface

October 16, 2008
Author(s)
S T. Cundiff, T M. Fortier
Optical second harmonic generation Is very sensitive to surfaces or interfaces if the bulk material is inversion symmetric. We present the resultsof second harmonic studies of the interface between silicon and silicon dioxide. Previous results have shown

Security Considerations in the System Development Life Cycle

October 16, 2008
Author(s)
Richard L. Kissel, Kevin M. Stine, Matthew A. Scholl, Hart Rossman, J Fahlsing, Jessica Gulick
The purpose of this guideline is to assist agencies in building security into their IT development processes. This should result in more cost-effective, risk-appropriate security control identification, development, and testing. This guide focuses on the

Self Assembly of a Nanoscale 3D Conductive Network Within an Amorphous Polymer

October 16, 2008
Author(s)
Lyle E. Levine, Gabrielle G. Long, R A. Gerhardt, R Ou, Jan Ilavsky, C A. Parker
The realization of a 3D network of self-assembled conductive nanowires embedded within an insulating matrix is demonstrated. The lengths, three-dimensional configurations and electrical connectivity of test wire networks are characterized. straight

Self-Assembled Porphyrinic Materials on Surfaces

October 16, 2008
Author(s)
J Batteas
For the foreseeable future, the vast majority of commercial electronics, photonics, and other devices will be in the solid state and incorporated onto or into a substrate though there are substantial efforts to change this paradigm (1). To date, most of

Self-Synchronizing Ergodic Maps and Chaotic Modulation

October 16, 2008
Author(s)
D G. Sterling
Self-synchronizing chaotic systems can be used as synchronous pseudo-random sequence generators, though physical applications have been limited by the sensitivity of the synchronous state to noise. Using two separate time scales in conjunction with a

Setting Kinetics of Calcium Phosphate Cement by Dielectric Spectroscopy

October 16, 2008
Author(s)
H J. Mueller, R W. Hirthe
Calcium phosphate cements (CPC) are useful because of their excellent biocompatibility and self-hardening behavior. The setting reaction involving equimolar quantities of tetracalcium phosphate (TTCP, Ca4(PO4)2O) and dicaalcium phosphate anhydrous (DCPA

Shape Effects in Ferromagnetic Resonance of Nanosize Rectangular Permalloy Arrays

October 16, 2008
Author(s)
Martha Pardavi-Horvath, Robert D. McMichael
In-plane and out-of-plane ferromagnetic resonance measurements were performed on arrays of Permalloy rectangles, prepared by interference lithography. In the absence of crystalline anisotropy, the shape anisotropy dominates the angular dependence of the

Shape Selectivity in Reversed-Phase Liquid Chromatography

October 16, 2008
Author(s)
Katrice Lippa, Kate Rimmer, Lane C. Sander
The separation of shape-constrained solutes in reversed-phase liquid chromatography is generally controlled by subtle differences in molecular shape together with stationary phase and operational parameters that promote stationary phase conformational

Shear Induced Tilt Order in Polymer Blends

October 16, 2008
Author(s)
Erik K. Hobbie, Haonan Wang, H Jeon, H W. Kim, D Stout, Charles C. Han
Optical studies of viscoelastic emulsions under simple shear flow reveal long-range spatial correlation in the orientation of the deformed domains. As the volume fraction of droplets increases, the tilt angle between the direction of orientation and the

Single-Crystal Plasticity: Statistical Physics and Experiments

October 16, 2008
Author(s)
Lyle E. Levine, R M. Thomson, M Savage, D E. Kramer, Y Shim
Although deformation usually appears to be a smooth process at the macroscopic scale, at smaller scales it is highly heterogeneous in both time and space, with fluctuations playing a crucial role. Over the past several years, we have used a variety of

Slip Bands in Deforming Metals

October 16, 2008
Author(s)
R M. Thomson, Lyle E. Levine, M Savage
It is proposed that a deforming solid is composed of two types of deforming regions: regions of percolating slip (slip bands) and regions of non percolating slip (matrix). The slip bands are identified with channels between GNB's (Geometrically Necessary

Small-Firm Experience in the Advanced Technology Program

October 16, 2008
Author(s)
J Powell
This paper assesses plans and progress of high technology small firms (HTSF) funded by the Advanced Technology Program (ATP), a U.S. civilian science and technology program, administered by the National Institute of Standards and Technology (NIST), within

Soot Precursors from Real Fuels: The Unimolecular Reactions of Fuel Radicals

October 16, 2008
Author(s)
Wing Tsang, Iftikhar A. Awan, William Sean McGivern, Jeffrey A. Manion
This paper describes studies aimed at defining in a quantitative fashion the cracking pattern of fuel radicals under combustion conditions. The experimental procedure involves studies using a single pulse shock tube and combining the observations with

Special Grain Boundaries Based on Local Symmetries

October 16, 2008
Author(s)
Leonid A. Bendersky, John W. Cahn
We propose that the operational local symmetries, rather than a coincidence site lattice (CSL), is important for the creation of special, low energy, grain boundaries (b) in large unit cell structures. We illustrate this with a Durer tiling, and its
Displaying 30001 - 30025 of 73697
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