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Displaying 29451 - 29475 of 73829

A Critical Compilation of Energy Levels and Spectral Lines of Neutral Boron

October 16, 2008
Author(s)
Alexander Kramida, A N. Ryabtsev
Observed spectral lines of neutral boron are critically compiled. Fromselected best measurements, an improved and extended set of energy levels isderived for the two most abundant isotopes, 11B and 10B. The ionization energyis determined to a greater

A Cross-Referencing Web Resource of Pre-Clinical Data for AIDS

October 16, 2008
Author(s)
Talapady N. Bhat, Anh D. Nguyen, G Noble, L Cooney, M Nasr, A Wlodawer, K Das
Structure-based drug discovery relies on efficient compilation and analysis of chemical, biological, pre-clinical and structural data. Factors such as inconsistent naming standards, publications and private archives with scattered and incomplete data, Web

A Description of the Fluoroelastomer Coating Evolution as a Polymer Processing Aid

October 16, 2008
Author(s)
Mathurin G. Meillon, D Morgan, D Bigio, Kalman Migler, S Oriani
For decades, fluoroelastomers have been used as polymer processing aids (PPA). Previous works have measured the thickness of the PPA coating, its effects on the polymer/die interface, and proposed several mechanisms of PPA coating. In this work, the

A Dielectric Slit die for In-Line Monitoring of Polymer Componding

October 16, 2008
Author(s)
Anthony J. Bur, M M. McBrearty
The dielectric slit die is a new instrument designed for real-time monitoring of polymer compounding. It is a multi-purpose sensing device for measuring dielectric, rheological and optical properties during extrusion. The instrument is mounted at the exit

A Finite Volume PDE Solver Using Python (FiPy)

October 16, 2008
Author(s)
Jonathan E. Guyer, Daniel Wheeler, James A. Warren
We present an object oriented partial differential equation (PDE) solver written in Python based on a standard finite volume (FV) approach.The solution of coupled sets of PDEs is ubuquitous in the numerical simulation of science problems. Numerous PDE

A General Technique for Calibrating Indicating Instruments

October 16, 2008
Author(s)
R White, M T. Clarkson
A method for calibrating indicating instruments that exploits the combinatorial properties of a set of different-valued, and mostly uncalibrated, artefacts is described. The paper presents the underlying principles of the method, its limitations, and

A Gravimetric Approach to the Standard Addition Method in Instrumental Analysis 1

October 16, 2008
Author(s)
William R. Kelly, Bruce S. MacDonald, William F. Guthrie
A general mathematical formulation for the method of standard additions is presented that has universal applicability. It is based on gravimetry rather than volumetry which reduces the preparation time, gives greater flexibility to design because one is

A Guide to Phenomenological Damping Formulations

October 16, 2008
Author(s)
J O. Rantschler, C Alexander
There are several phenomenological damping formulations currently in use in the literature. Beyond the Landau-Lifshitz equation (LL) and the Bloch-Bloembergen equations (BB), there is Safonov and Bertram s (SB) method designed to bridge between microscopic

A History of Encasements; Technology Preserving the Charters of Freedom

October 16, 2008
Author(s)
Christopher J. Evans
In its centennial year, the National Institute of Standards and Technology (NIST) will complete the second set of hermetic encasements for the nation's founding documents - the Declaration of Independence, the Constitution, and the Bill of Rights. This

A Mean-Field Model of Extrinsic Line Broadening in Ferromagnetic Resonance

October 16, 2008
Author(s)
Robert D. McMichael
A model of ferromagnetic resonance in inhomogeneous films is described that includes interactions in a mean-field approximation. The mean-field model yields linewidth values that span the range from intrinsic linewidth for strong interactions to fully

A merged-beams energy-loss technique for electron-ion excitation: Absolute total cross sections for o 5+ (2s> 2p)

October 16, 2008
Author(s)
E W. Bell, X Q. Guo, J L. Forand, K Rinn, D R. Swenson, J S. Thompson, G H. Dunn, M E. Bannister, D C. Gregory, Ray A. Phaneuf, A C. Smith, A Muller, C A. Timmer, E K. Wahlin, B D. DePaola, D S. Belic
A merged-beams electron-energy-loss technique is described by which absolute cross sections can be measured for near-threshold electro-impact excitation of multiply charged ions. Results are reported here for absolute total electron-impact excitation cross

A Method to Quantify Uncertainty Due to Bias in Chemical Analyses

October 16, 2008
Author(s)
Raghu N. Kacker
A widely accepted approach to assure that the certified property of a chemical reference material is independent of the method of analysis is to analyze by two or more judiciously chosen methods. The statistical problem then is to determine the consensus

A Modified Wigner's Inequality for Secure Quantum Key Distribution

October 16, 2008
Author(s)
Stefania Castelletto, Ivo P. Degiovanni, M L. Rastello
In this letter we discuss the insecurity with present implementations of the Ekert protocol for quantum-key distribution based on the Wigner Inequality. We propose a modified version of this inequality which guarantees safe quantum-key distribution.

A Multi-Sample Melt Micro-Rheometer

October 16, 2008
Author(s)
Anthony J. Bur, Kalman Migler
A slit micro-rheometer that is used for simultaneous measurement of melt viscosities of four samples has been developed. Sample size is less than 100 mg. The driving force for the rheometer is gas pressure from a nitrogen tank that forces polymer melt into

A New Chemical Reactor for Protein Crystal Growth

October 16, 2008
Author(s)
David Travis Gallagher, C Stover, J Moses, D Charlton, E Steinberg, L Arnowitz
Current rapid advances in the genomic and biochemical sciences provide impetus for finding improved ways of crystallizing proteins for structure determination. A new dialysis-based reactor for protein crystal growth is described. The device utilizes motor

A New International Evaluation of the Neutron Cross Section Standards

October 16, 2008
Author(s)
Allan D. Carlson
The measurements of most neutron cross sections are made relative to neutron cross section standards. The last complete evaluation ofthe standards, which was for ENDF/B-VI, took place almost 15 years ago. The cross section standards produced for the ENDF/B
Displaying 29451 - 29475 of 73829
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