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Displaying 6626 - 6650 of 13218

Phenomenology of Passive Broadband Terahertz Images

February 15, 2006
Author(s)
Charles Dietlein, A. Luukanen, Francois Meyer, Zoya Popovic, Erich N. Grossman
… are analyzed with two specific parameters of interest in mind. First, the minimum system noise level for clothing … ESA Workshop on Millimetre-wave Technology and Applications …

Terahertz circular variable filters

February 15, 2006
Author(s)
Erich N. Grossman, Charles Dietlein, A. Luukanen
… analogous to the circular-variable filters commonly used in the infrared for low to moderate resolution spectroscopy, … that display broad but distinct spectral features in the submillimeter wavelength band. Low-cost fabrication … show resolving powers of >6, presently limited by beamsize in the measurement setup, and insertion loss <0.5 dB. …

Novelty Detection: The TREC Experience

October 1, 2005
Author(s)
Ian M. Soboroff, Donna K. Harman
… contains something new which the user has not seen before. In the TREC novelty track, the task was to highlight … sentences containing relevant and new information in a short, topical document stream. This is analogous to … Proceedings of the 2005 conference on Human Language Technology …

Transformation, Ranking, and Clustering for Face Recognition Algorithm Comparison

March 1, 2002
Author(s)
Stefan D. Leigh, Nathanael A. Heckert, Andrew L. Rukhin, J G. Phillips, Elaine M. Newton, M Moody, K Kniskern, S Heath
The performance of face recognition algorithms is recently of increased interest, although to date empirical analyses of algorithms have been limited to rank-based scores such a cumulative match score and receiver operating characteristic. This paper

Sapphire Statistical Characterization and Risk Reduction Program

September 1, 2001
Author(s)
D R. McClure, R W. Cayse, David R. Black, S M. Goodrich, K Peter, D Lagerloef, D C. Harris, D McCullum, D H. Platus, C E. Patty, Robert S. Polvani
… or dome and, as much as possible, coupons were fabricated in the same manner as the corresponding part of the window or … specifications from the same blanks by another fabricator. In laser thermal shock tests, sapphire performed better than …

The Performance of a Nanocrystalline Tungsten Composite in Ballistic Impacts

September 1, 2001
Author(s)
L S. Magness, L Kesckes, Frank S. Biancaniello, Stephen D. Ridder, M Chung, D Kapoor
… was produced. Tungsten powders were ball milled in a controlled atmosphere environment, with rapidly … transformation. The milled powders were consolidated in a Hot Isostatic Press (HIP). Microstructural examinations … tests were conducted on the consolidated product. In quarter-scale ballistic testing, the penetration …

Compressive Strengthening of Sapphire by Neutron Irradiation

May 9, 2001
Author(s)
T M. Regan, D C. Harris, R M. Stroud, J R. White, D W. Blodgett, K C. Baldwin, J A. Miragliotta, M E. Thomas, M J. Linevsky, J W. Giles, T A. Kennedy, M Fatemi, David R. Black
… neutrons (= 1 eV), thereby reducing residual radioactivity in the sapphire to background levels in a month. Yellow-brown irradiated sapphire is nearly … the flexure strength of sapphire at 600 C by 0%-20% in some experiments. However, the c-plane ring-on-ring …

Improved Time-Base for Waveform Parameter Estimation

May 1, 2000
Author(s)
Bryan C. Waltrip, Owen B. Laug, Gerard N. Stenbakken
… and associated auto-calibration algorithm for use in a high-accuracy sampling waveform acquistion system are … sources of error of the time-base and correction algorithm in an equivalent time sampling system are also discussed. … Proc. IEEE Instrumentation and Technology Conference (IMTC) …

Nonrandom Quantization Errors in Timebases

May 1, 2000
Author(s)
Gerard N. Stenbakken, D. Liu, J. A. Starzyk, Bryan C. Waltrip
… of the sampled waveforms, such distortions result in errors in the measured rms values. This paper looks at the nature of … the errors that result from nonrandom quantization errors in an instrument's timebase circuit. Simulations and … Proc. IEEE Instrumentation and Technology Conference (IMTC) …

Calculable Coaxial Resistors for Precision Measurements

May 1, 1999
Author(s)
Randolph E. Elmquist
… comparisons between resistors, capacitors, and inductors in the audio frequency range. The design is based on the … of standard resistors and of the quantum Hall resistance in the audio frequency range. … Proc. IEEE Instrumentation and Technology Conference (IMTC) …
Displaying 6626 - 6650 of 13218
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