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Displaying 46201 - 46225 of 73994

Improved Range Resistors for AC-DC Transfer Measurements

January 18, 2001
Author(s)
H. O. Wolcott, Joseph R. Kinard Jr., Thomas E. Lipe Jr.
This paper discusses the factors contributing to the ac-dc differences of high-voltage thermal converters. A novel resistor designed to minimize these contributions is described and measurements illustrating its performance are summarized.

Analytic Continuation, Singular Value Expansions, and Kramers-Kronig Analysis

January 17, 2001
Author(s)
Andrew M. Dienstfrey, L Greengard
We describe a systematic approach to the recovery of a function analytic in the upper half plane, ${\bfC:^+$, from measurements over a finite interval on the real axis, $D\subset {\bfR}$. Analytic continuation problems of this type are well-known to ill

CASSCF Investigation of Electronic Excited States of 2-Aminopurine

January 11, 2001
Author(s)
E L. Rachofsky, J B. Ross, Morris Krauss, R Osman
2-aminopurine is a highly fluorescent analog of adenine that can be incorporated synthetically into DNA with little perturbation of the native double-helical structure. The sensitive dependence of the quantum yield of this fluorophore on nucleic acid

Impediments to Reproducibility in Display Metrology

January 11, 2001
Author(s)
Edward F. Kelley
Most people are surprised to learn of the complexities of measuring the performance of electronic displays. Serious errors are encountered in even seemingly simple measurements if we blithely measure displays without being aware of the pitfalls. We discuss

Measurement and Evaluation of Embodied Conversational Agents

January 10, 2001
Author(s)
Gregory A. Sanders, Jean C. Scholtz
A formative evaluation for the DARPA Communicator project is used as an extended example ofevaluating a non-embodied conversational system, in order to provide context and illustrate howevaluating embodied agents requires extensions to existing techniques

Long-Term Charge Offset Noise in Coulomb-Blockade Devices

January 9, 2001
Author(s)
William Huber, S Martin, Neil M. Zimmerman
While Coulomb-Blockade devices have shown promise as qubit systems or qubit state detectors, large scale parallelization of these devices is severely hampered due to the low-frequency charge offset (Q 0) drift in time. We note that an extrapolation of the

Transverse Stress and Fatigue Effects in Y-Ba-Cu-O Coated IBAD Tapes

January 8, 2001
Author(s)
John (Jack) W. Ekin, S L. Bray, Najib Cheggour, Cameron C. Clickner, S R. Folytn, P N. Arendt, A A. Polyanskii, David C. Larbalestier, C. N. McCowan
Measurements of the effects of static and cyclic (fatigue) transverse stress on the critical current of Ya-Ba-Cu-O-coated tapes made by ion-beam-assisted deposition (IBAD) are reported at 76 K in self magnetic field. Ya-Ba-Cu-O films (15m thick) on Inconel

Toxic Yield

January 7, 2001
Author(s)
William M. Pitts
It is generally recognized that the vast majority of deaths associated with accidental enclosure fires are due to smoke inhalation. Older reviews of autopsy results suggested that the fraction was on the order of 2/3. In the United States there is evidence

Blackman Diagrams and Elastic-Constant Systematics

January 5, 2001
Author(s)
H M. Ledbetter
We consider Blackman diagrams for various cubic materials. These diagrams, plots of reduced elastic-stiffness coefficients C 12/C 11 versus C 44/C 11, show that materials with similar chemical bonding tend to fall in the same region of the diagrams. Such

Bulk-Moduli Systematics in Oxides Including Superconductors

January 5, 2001
Author(s)
H M. Ledbetter, Sudook A. Kim
For oxides, including superconductors, we consider the systematics of the bulk-modulus/atomic-volume (B/V a) relationship. For nonsuperconducting oxides, the B-V a diagram shows that most oxides fall in three sets: (1) rocksalt crystal structure, AO; (2)

Elastic Constants of Porous Ceramics

January 5, 2001
Author(s)
H M. Ledbetter, M Lei, S K. Datta
Using theoretical models, we consider the elastic constants of ceramics containing proes. As an example, we consider alumina. However, the approach applies to all ceramics. As a point of departure, we consider spherical pores. For all the usual elastic

Elastic Gr neisen Parameters of Cubic Elements and Compounds

January 5, 2001
Author(s)
H M. Ledbetter, Sudook A. Kim
From a material's second-order elastic-stiffness coefficients C ijkl and its third-order elastic-stiffness coefficients C ijklmn, we calculated the scalar dimensionless Gr neisen parameter γ, the single most important property of an anharmonic solid. We

Interactive Training Through Knowledge Navigation

January 5, 2001
Author(s)
Howard T. Moncarz
This paper describes the initiation of our project to study three-dimensional navigation through manufacturing knowledge domains suitable for training. In summary we are organizing and representing knowledge from the NIST Manufacturing Engineering

An HLLC-Type Approximate Riemann Solver for Ideal Magnetohydrodynamics

January 2, 2001
Author(s)
Katharine F. Gurski
This paper presents a new solver based on the HLLC (Harten-Lax-van Leer-contact wave) approximate nonlinear Riemann solver for gas dynamics for the ideal magnetohydrodynamics (MHD) equations written in conservation form. It is shown how this solver also

'Supercritical Water' Density Effects on the Rate of Isopropanol Dehydration

January 1, 2001
Author(s)
V I. Anikeev, Jeffrey A. Manion, A Ermakova
A new experimental procedure for studying the kinetics and thermodynamics of chemical reactions in supercritical fluids-solvents was suggested. The kinetics and mechanism of the dehydration of 2-propanol in supercritical water in a closed reactor were
Displaying 46201 - 46225 of 73994
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