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Displaying 36526 - 36550 of 74189

Generation of Lattice Wannier Functions via Maximum Localization

January 20, 2005
Author(s)
Eric J. Cockayne
A method is presented for generating approximate lattice Wannier functions (LWF) for lattice dynamics problems, using the dynamical matrix for a supercell as input. The lattice Wannier functions fit selected phonon frequencies and eigenvectors exactly, are

Design, Development and Testing of a Hybrid Device for In-Situ Testing of Sealant

January 19, 2005
Author(s)
Christopher C. White, E Embree, C Buch
A new hybrid in-situ sealant-testing device that uses movement to both characterize and fatigue standard ASTM C719 sealant samples is described. This five sample device, records the force-response data for every deformation cycle of every sample. From this

Uncertainty reporting for experimental thermodynamic properties

January 13, 2005
Author(s)
Qian Dong, Robert D. Chirico, Xinjian Yan, X Hong, Michael D. Frenkel
This paper reviews practices in the expression of uncertainty in the experimental literature for thermodynamic property measurements with determinations of critical temperature for pure compounds used as a case study. The time period considered is from

Investigation of the Charge Compensation Mechanism on the Electrochemically Li-Ion Deintercalated Li 1-x Co 1/3 Ni 1/ 3MN 1/3 O 2 Electrode System by Combination of Soft and Hard X-Ray Absorption Spectroscopy

January 11, 2005
Author(s)
W S. Yoon, Kyung Y. Chung, Xiao-Qing Yang, James McBreen, Mahalingam Balasubramanian, C P. Grey, Daniel A. Fischer
In situ hard X-ray absorption spectroscopy (XAS) at metal K-edges and soft XAS at O K-edge and metal L-edges have been carried out during the first charging process for the layered Li1-2Co1/3Ni1/3Mn1/3O2 cathode material. The metal K-edge XANES results

Method for Estimating the Dielectirc Constant of Natural Gas Mixtures

January 11, 2005
Author(s)
Allan H. Harvey, Eric W. Lemmon
A method is developed for calculating the static dielectric constant (relative permittivity) of fluid mixtures, with an emphasis on natural gas. The dielectric constant is calculated as a function of temperature, density, and composition; the density is

Method for estimating the dielectric constant of natural gas mixtures

January 11, 2005
Author(s)
Allan H. Harvey, Eric Lemmon
A method is developed for calculating the static dielectric constant (relative permittivity) of fluid mixtures, with an emphasis on natural gas. The dielectric constant is calculated as a function of temperature, density, and composition; the density is

LEAD-FREE SOLDER DATA: COLLECTION AND DEVELOPMENT

January 10, 2005
Author(s)
Thomas A. Siewert, David R. Smith, Yi-Wen Cheng, Juan C. Madeni, S X. Liu
The rising interest in lead-free solders creates a need for complete property data on the various lead-free solder compositions. Various types of data are available, but are widely dispersed through the literature. To improve the sharing of this important

A Coupled Arc and Droplet Model of GMAW

January 8, 2005
Author(s)
Timothy P. Quinn, M Szanto, T Gilad, I Shai
A model of gas metal arc welding was developed that solves the magneto-hydrodynamic equations for the flow and temperature fields of the molten electrode and the plasma simultaneously, to form a fully coupled model. A commercial finite element code was

Temperature Variation of the Fluctuation Field in Co/Pt

January 7, 2005
Author(s)
S Rao, Edward Della Torre, Lawrence H. Bennett, H. Seyoum, R E. Watson
Measurements of the fluctuation field of a Co/Pt multilayer medium were carried out from 4 K to roomtemperature, using a procedure that for each holding field matches, in log-time, the aftereffect curve withthe major loop. This is done by translation and

Antisymmetric Magnetoresistance in Magnetic Multilayers With Perpendicular Anisotropy

January 6, 2005
Author(s)
X M. Cheng, Sergei Urazhdin, T Tchernyshyov, C L. Chien, Valerian I. Nikitenko, Alexander J. Shapiro, Robert D. Shull
While magnetoresistance (MR) has generally been found to be symmetric in applied field H in non-magnetic or magnetic metals, we have observed antisymmetric MR in Co/Pt multilayers. Simultaneous domain imaging and transport measurements show that the

QR Factorizations Using a Restricted Set of Rotations

January 6, 2005
Author(s)
Dianne M. O'Leary, Stephen Bullock
Any matrix of dimension m x n (m greater than or equal to n) can be reduced to upper triangular form by multiplying by a sequence of mn - n(n + 1) / 2 appropriately chosen rotation matrices. In this work, we address the question of whether such a

Simple flow meter and viscometer of high accuracy for gases

January 6, 2005
Author(s)
Robert F. Berg
A model and supporting measurements are presented for the laminar flow of gases through a long capillary with a circular cross section. Using the model with a coil of quartz capillary of known dimensions yields the flow rates of a gas of known viscosity

System Performance and Natural Language Expression of Information Needs

January 5, 2005
Author(s)
Walter S. Liggett Jr, C E. Buckley
Consider information retrieval systems that respond to a query (a natural language statement of a topic, an information need) with an ordered list of 1000 documents from the document collection. From the responses to queries that all express the same topic
Displaying 36526 - 36550 of 74189