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Displaying 36476 - 36500 of 74129

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

Analysis of Wasp Waist Hysteresis Loops

January 3, 2005
Author(s)
Lawrence H. Bennett, Edward Della Torre
Wasp-waist and pot belly hysteresis loops have been observed in many materials. When only the major loop is reported, the results are insufficient to establish which processes are involved. We present two models for wasp waist materials that produce

Effect of Magnetic Field Dynamics on Thermocouple Performance

January 3, 2005
Author(s)
F Shir, Lawrence H. Bennett, C Mavriplis
There are challenges in measuring temperature by thermocouples in a time-dependent magnetic field. Although there is considerable experience of the effect of a steady magnetic field, there is a lack of awareness of the outcome of a varying field on

New Generation of the NIST Atomic Spectroscopic Databases

January 3, 2005
Author(s)
Y Ralchenko, Jeffrey R. Fuhr, F C. Jou, Alexander Kramida, William C. Martin, Larissa Podobedova, Joseph Reader, E B. Salomon, Jean E. Sansonetti, Wolfgang L. Wiese
The latest advances in development of atomic spectroscopic databases at the National Institute of Standards and Technology (NIST) result from implementation of modern technologies in database management and database-user interaction. Here we report a

NIST Time and Frequency Bulletin

January 3, 2005
Author(s)
Eyvon Petty
The Time and Frequency Bulletin provides information on performance of time scales and a variety of bradcasts (and related information) to users fo the NIST services.

Obstacle Detection using a TOF Range Camera* for AGV Safety and Navigation

January 3, 2005
Author(s)
Roger V. Bostelman, Tsai Hong Hong, Rajmohan Madhavan
The performance evaluation of an obstacle detection and segmentation algorithm for Automated Guided Vehicle (AGV) navigation in factory-like environments using a 3D real-time range camera is the subject of this paper. Our approach has been tested
Displaying 36476 - 36500 of 74129