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Displaying 29776 - 29800 of 73461

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

Spectroradiometric Sources

October 16, 2008
Author(s)
Howard W. Yoon, Charles E. Gibson
rth climate modeling and global impacts of particles and gases in the atmosphere are some of the studies that benefit from the use of spectroradiometers calibrated for spectral irradiance. Spectral irradiance is the optical power incident per unit area of

Spectrum of Singly-Ionized Cesium (Cs II)

October 16, 2008
Author(s)
Craig J. Sansonetti, K L. Andrew
We measured the spectrum of cesium emitted by a pulsed radio-frequency discharge in the region 1550 to 40 000 using concave grating spectrographs, Fabry-Perot interferometry, and Fourier transform spectroscopy. By varying the operating parameters of the

Speed-Measuring Device Performance Specifications: Radar Module

October 16, 2008
Author(s)
A G. Lieberman
Technical requirements and verification procedures are presented which define a baseline for acceptable traffic radar device performance. Manufacturers are encouraged to produce radar models that meet or exceed these performance specifications; equipment

Spinodal Dewetting on Chemically Patterned Substrates

October 16, 2008
Author(s)
A Sehgal, V Ferreiro, Jack F. Douglas, Eric J. Amis, Alamgir Karim
We utilize chemically patterned substrates with arrays of progressively narrower stripes (1-15 mm) to investigate the influence of pattern size on the morphology of dewetting polystyrene films. The early-stage dewetting patterns align with the substrate

SRM 1955, Homocysteine and Folate in Human Serum; Production of a New Standard Reference Material

October 16, 2008
Author(s)
Mary B. Satterfield, B C. Nelson, Lorna T. Sniegoski, Adriana Hornikova, Nien-Fan Zhang, Christine M. Pfeiffer, Michael J. Welch
Homocysteine (HCY) and folate are interrelated biomarkers for arteriosclerosis and coronary heart disease with health problems associated with increased levels of homocysteine and low levels of folate. Although many different tests for both HCY and folate

SSE- and Noise-Optimized InGaAs Radiation Thermometer

October 16, 2008
Author(s)
Howard W. Yoon, Charles E. Gibson, V B. Khromchenko, George P. Eppeldauer
For the measurements of radiance temperatures in the range from 150 ?C to 1000 ?C, low uncertainties in the temperature measurements can be achieved by using near-infrared InGaAs radiation thermometers. We describe the design and construction of the NIST

Stability of Bose-Einstein Condensates in a Kronig-Penney Potential

October 16, 2008
Author(s)
Ippei Danshita, S Tsuchiya
We study the stability of Bose-Einstein condensates with superfluid currents in a one-dimensional periodic potential. By using the Kronig-Penney model, the condensate and Bogoliubov bands are analytically calculated and the stability of condensates in a

Standards Education Roundtable

October 16, 2008
Author(s)
M H. Saunders
This article for ASTM's Standardization News answers a series of questions for an Education Roundtable. Based on the importance of standards for everyday life and the economy, it discusses the need for several types of training in standards for present and

Standards for Intravascular Brachytherapy Dosimetry

October 16, 2008
Author(s)
Christopher G. Soares
The dosimetry of intravascular brachytherapy sources is quite difficult due to the small size of the sources and the close proximity at which measurements are necessary. The development of National Standards for the dosimetry of these sources is described
Displaying 29776 - 29800 of 73461
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