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Displaying 41451 - 41475 of 73970

Terrain Characterization from Ground-Based LADAR

March 17, 2003
Author(s)
Christoph J. Witzgall, Geraldine S. Cheok, David E. Gilsinn
Test runs of Army Research Laboratory s (ARL) autonomous vehicle (Experimental Unmanned Vehicle, XUV) were followed by the acquisition of high resolution scans of selected regions of the test course. These scans were used to i) determine terrain features

Current-Induced Spin-Wave Excitations in a Single Ferromagnetic Layer

March 14, 2003
Author(s)
Yi Ji, C Chien, Mark D. Stiles
Evidence for a current induced spin-transfer torque effect has been investigated in a series of point contacts to single ferromagnetic layers. At specific current densities, abrupt resistance changes, similar to those attributed to current-induced spin

Temperature-Controlled MEMS Chemical Microsensors

March 13, 2003
Author(s)
Stephen Semancik, Richard E. Cavicchi, Douglas C. Meier, C J. Taylor, N O. Savage, M C. Wheeler
This paper describes MEMS microheater structures that have been employed in the development of chemical (gas) microsensors and other microanalytical components, such as preconcentrators and filters/separators. The role of microscale temperature control is

Separating Signal From Noise in Global Warming

March 12, 2003
Author(s)
Bert W. Rust
One argument often used against global warming is that the global temperature record is too noisy to allow a clear determination of the signal. This paper presents two models for the signal which suggest that: (1) the warming is accelerating, (2) the

Energy Consumption Measurements Using AHAM HRF-1 and ISO 8561

March 10, 2003
Author(s)
David A. Yashar
This investigation compares the energy consumption ratings obtained for refrigerators using the Association of Home Appliance Manufacturers (AHAM) HRF-1 test procedure, as adopted by the United States Department of Energy (DOE), and the International

Surface and Interface Properties of UV-Exposed PVDF/PMMA-CO-PEA Blends

March 5, 2003
Author(s)
Xiaohong Gu, Li Piin Sung, D L. Ho, Chris A. Michaels, D Nguyen, Y C. Jean, Tinh Nguyen
The surface and interface of PVDF blended with different amounts of poly (methyl methacrylate) and poly (ethyl acrylate) copolymer (PNMA-co-PEA) have been investigated before and after exposure to UV light. Dry free films having athickness of approximately

Thin Films of Collagen Affect Smooth Muscle Cell Morphology

March 4, 2003
Author(s)
John T. Elliott, Alessandro Tona, John T. Woodward IV, P L. Jones, Anne L. Plant
The purpose of this study was to provide a reproducible method for applying collagen to surfaces on which cells can be grown, and to characterize the resulting thin films of collagen protein with respect to molecular structure and cellular response

A Primary Standard for 157 nm Excimer Laser Measurements

March 1, 2003
Author(s)
Christopher L. Cromer, Marla L. Dowell, Richard D. Jones, Darryl A. Keenan, Shao Yang
Two primary standard calorimeters have been developed for accurate measurements of 157 nm (F2) excimer laser power and energy. The calorimeter specifications and design are discussed. Results from the construction and testing of the calorimeters, control

Accuracy of Nanoscale Pitch Standards Fabricated by Laser-Focused Atomic Deposition

March 1, 2003
Author(s)
Jabez J. McClelland, W Anderson, C Bradley, M Walkiewicz, R Deslattes, E Jurdik, Robert Celotta
The pitch accuracy of a grating formed by laser-focused atomic deposition is evaluated from the point of view of fabricating nanoscale pitch standard artifacts. The average pitch obtained by the process, nominally half the laser wavelength, is simply

Airborne Smoke Sampling Package for Field Measurements of Fires

March 1, 2003
Author(s)
James R. Lawson, George W. Mulholland, H Koseki
A unique airborne smoke sample package (ASSP) for determining the smoke yield of large fires has been developed. The uncertainty in the average smoke yield at the 95% confidence interval is about +7% of the average of three repeat measurements. The ASSP

ALOFT-PC: A Smoke Plume Trajectory Model for Personal Computers

March 1, 2003
Author(s)
William D. Walton, Kevin B. McGrattan, J V. Mullin
As the understanding of the capabilities and limitations of in situ burning of oil spills increases, in situ burning continues to gain acceptance as an oil spill mitigation tool. One widely imposed criteria for the use of in situ burning is limiting the

Analysis of Performance Variation Using Query Expansion

March 1, 2003
Author(s)
Alan Smeaton
Information retrieval performance evaluation is commonly made based on the classical recall and precision based figures or graphs. However, important information indicating causes for variation may remain hidden under the average recall and precision

Asymptotic Behavior of a Strain Percolation Model for a Deforming Metal

March 1, 2003
Author(s)
Y Shim, Lyle E. Levine, R M. Thomson, D E. Kramer
In this paper, we present a recent advance in theoretical understanding of a deforming metal, using a strain percolation model which possibly explains spasmodic, fine slip line burst events occurring in the metal. The model addresses how the additional
Displaying 41451 - 41475 of 73970
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