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Displaying 28951 - 28975 of 74137

Image Analysis for High-Throughput Materials Science

October 16, 2008
Author(s)
Alamgir Karim, A Sehgal, J C. Meredith, A J. Crosby, Eric J. Amis
Imaging plays a key role in modern day materials science by providing a high-density format of data representation that can be visually interpreted or processed by the human brain in a fraction of a second. We have illustrated a few select examples-

In Search of Higher Sensitivity Pu Isotopic Analysis

October 16, 2008
Author(s)
Hiromu Kurosaki, D Chang, Kenneth G. Inn
Thermal ionization mass spectrometry (TIMS) is an effective method for isotopic and ultra-sensitivity determination of plutonium. This project aims at improving the NIST TIMS sensitivity for the analysis of plutonium from environmental sample. The TIMS

In Vitro Remineralization of Artificial Tooth Lesions with Ca-PO 4 Resin Cements

October 16, 2008
Author(s)
Sabine H. Dickens, Glenn M. Flaim, Shozo Takagi
Resin-based Ca-PO 4 cements without (Cement A) and with a fluoride-releasing additive (Cement B) were used to treat caries-like lesions on enamel and dentin thin sections of human molars (Model I), which were then incubated for up to 6 weeks in distilled H

In-Situ Visualization of Novel Polymer Droplet Morphologies During Extrusion

October 16, 2008
Author(s)
Erik K. Hobbie, Kalman Migler
We report the observation of novel droplet morphologies in the high stress layers near the walls of a specially instrumented slit die. We utilize in-situ optical microscopy to study a dilute blend of polystyrene (PS) in a polyethylene (PE) matrix. At low

InChI a Structure Based IUPAC Identifier for 3-D Structures of AIDS Inhibitors

October 16, 2008
Author(s)
M D. Prasanna, H Rodriguez, J Vondrasek, A Wlodawer, Talapady N. Bhat
The human immunodeficiency virus encodes an aspartic protease which is responsible for posttranslational proteolytic processing of the gag and gag-pol polyprotein gene products into mature functional proteins. Following these proteolytic activities, the

Incorporation of Stereo, Regio and Comonomer Defects Into the Crystalline Regions of Isotactic Polypropylene: Results From NMR, Molecular Dynamics and Chemical Shift Calculations

October 16, 2008
Author(s)
David L. VanderHart, Marc R. Nyden, R G. Alamo, L Mandelkern
We have shown that under conditions of crystallization during cooling at 1C/min, substantial amounts of 'defects' of the types a) stereo-mrrm, b) regio-2,1-erythro, c) ethylene-comonomer and d) butylene- comonomer can be found in the crystalline regions

Index of Retraction and its Temperature Dependence of Calcium Fluoride Near 157nm

October 16, 2008
Author(s)
John H. Burnett, Ulf Griesmann, R Gupta, T E. Jou
We have made accurate measurements near 157 nm of the relative index of refraction, its dispersion, and its temperature dependence for two grades of calcium fluoride in N 2 gas. Accurate measurements of the quantitites are needed for the design of lens

Infrared and Raman Studies of the Verwey Transition in Magnetite

October 16, 2008
Author(s)
L V. Gasparov, D B. Tanner, D B. Romero, H Berger, G Margaritondo, L Forro
We present infrared and Raman measurements of magnetite (Fe 3O 4). This material is known to undergo a metal-insulator and a structural transition (Verwey transition) at T V = 120 K. At temperatures below T V, we observe a strong gap-like suppression of

Infrared Spectrum and Revised Energy Levels for Neutral Krypton

October 16, 2008
Author(s)
Craig J. Sansonetti, Marion Greene
We observed the spectrum of neutral krypton (Kr I) in its naturally occurring isotopic mixture as emitted by a microwave-excited electrodeless discharge lamp with the National Institute of Standards and Technology 2-m Fourier transform spectrometer. The

Inhibition of Silane Ignition by Iodine Containing Additives

October 16, 2008
Author(s)
Valeri I. Babushok, Wing Tsang
The results of numerical studies on the influence of iodine and hydrogen iodide additives on silane self-ignition limits are reported. The entire matrix of possibilities with regard to silane and oxygen ratios was covered. The temperature and pressures

Injectable Calcium Phosphate Cements

October 16, 2008
Author(s)
Laurence C. Chow, Milenko Markovic, Shozo Takagi
Self-hardening calcium phosphate cements (CPC) have been the subject of considerable interest in biomaterials research, especially as a bone graft material. The first published CPCs consisted of tetracalcium phosphate (TTCP) and dicalcium phosphate

Innovation in Telehealth and a Role for the Government

October 16, 2008
Author(s)
R N. Spivack
America's healthcare system is regarded as among the world's best. The application of new technologies to medical care has enabled significant progress. However, the wider adoption of telehealth technologies promises even greater access and higher quality
Displaying 28951 - 28975 of 74137