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Displaying 29326 - 29350 of 73697

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

A Standard Reporting Format for Summative Usability Evalutations

October 16, 2008
Author(s)
Jean C. Scholtz, Emile L. Morse
Poor usability is an uncontrolled source of overhead, caused by the need for users to correct errors and continually re-learn complex user interfaces. Software that is measurably usable reduces errors, reduces training costs, and reduces maintenance costs

A Statistical Connection Between Dislocations and Mechanical Properties

October 16, 2008
Author(s)
Lyle E. Levine, R M. Thomson
The extreme complexity of the dislocation-based processes that underlie plastic deformation are in marked contrast to the relatively simple behavior observed macroscopically. The simplification arises because a deforming metal can be described as a self

A Systematically-Generated, Pressure-Dependent Mechanism for High-Conversion Ethane Pyrolysis. Part II: Radical Disproportionations, Missing Reaction Families, and the Consequences of Pressure-Dependence

October 16, 2008
Author(s)
D M. Matheu, J M. Grenda
Part I of this work systematically developed a pressure-dependent reaction mechanism for the high-conversion pyrolysis of ethane [1], as studied experimentally by Glasier and Pacey [2]. By combining conventional equilibrium, sensitivity, and reaction
Displaying 29326 - 29350 of 73697
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