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Displaying 44901 - 44925 of 73960

Question Answering in TREC

November 1, 2001
Author(s)
Ellen M. Voorhees
The Text REtrieval Conference (TREC) question answering track is an effort to bring the benefits of large-scale evaluation to bear on a question answering (QA) task. The track has run twice so far, first in TREC-8 and again in TREC-9. In each case the goal

Recommendation for Interstate Criminal History Transmission Specification

November 1, 2001
Author(s)
Michael D. Garris
This report contains technical comments and recommendations regarding the ¿Interstate Criminal History Transmission Specification ¿ XML Version 2.01¿ published June 2001. This specification was written by a national task force, the Joint Task Force on Rap

Role of OCP in Biological Processes

November 1, 2001
Author(s)
Naomi Eidelman, E D. Eanes
For several decades deJong [1926] first identified the mineral found in skeletal tissues as similar in structure to hydroxyapatite, Ca 5(PO 4) 3OH(OHAp), this phase was considered to be the only significant crystalline calcium phosphate constituent in

SAE J1757 Committee Report on Proposed Reflection Measurement Methods

November 1, 2001
Author(s)
Edward F. Kelley
This is a report to the committee regarding reflection measurements that impact the current draft standard. Diffuse reflectance measurements are compared to transmitting diffuser measurements of several flat panel displays and samples in attempts to show

Standard Reference Material (SRM 1990) for Single Crystal Diffractometer Alignment

November 1, 2001
Author(s)
Winnie K. Wong-Ng, T Siegrist, G DeTitta, L Finger, H Evans, E Gabe, G Enright, J T. Armstrong, M Levenson, Lawrence P. Cook, C R. Hubbard
Through extensive international collaborations, a standard reference material, SRM 1990 (a set of 3500 units of Cr-doped Al2O3, or ruby sphere) for single crystal diffractometer alignment has been certified at NIST after a successful international round

Strength and Ductility of Concrete Beams Reinforced with Carbon FRP and Steel

November 1, 2001
Author(s)
Dat Duthinh, M A. Starnes
Seven concrete beams reinforced internally with steel and externally with carbon fiber-reinforced polymers (FRP) applied after the concrete had cracked were tested under four-point bending. Results show that FRP is very effective for flexural strengthening

Strength of an Interlocking FRP Connection

November 1, 2001
Author(s)
Dat Duthinh, K K. Bajpai
The strength of an interlocking fiber-reinforced polymer (FRP) connection was measured in bending, and in-plane and out-of-plane shear. This connection allows the rapid assembly of FRP panels into houses, and can be used in interlocking mode only, or

Substrate Effects on Indentation Plastic Zone Development in Thin Soft Films

November 1, 2001
Author(s)
D E. Kramer, A A. Volinsky, N R. Moody, W Gerberich
Plastic zone evolution in A1-2 wt% Si metal films on silicon and sapphire substrates was studied using nanoindentation and atomic force microscopy (AFM). AFM was used to measure the extent of plastic pileup which is a measure of the plastic zone radius in

Superfluid-to-Solid Crossover in a Rotating Bose-Einstein Condensate

November 1, 2001
Author(s)
D L. Feder, Charles W. Clark
The properties of a rotating Bose-Einstein condensate confined in a prolate cylindrically symmetric trap are explored both analytically and numerically. As the rotation frequency increases, an ever greater number of vortices are energetically favored

The Influence of a Multilayered Metallic Coating on Fatigue Crack Nucleation

November 1, 2001
Author(s)
Mark R. Stoudt, Richard E. Ricker, R C. Cammarata
A through review of the literature on fatigue crack initiation indicates that for optimum resistance to fatigue crack initiation, a surface coating needs more than just a high hardness and that a combination of properties including toughness, cyclic work

The Role of High-purity Noble Metals in Precision Thermometry

November 1, 2001
Author(s)
Dean C. Ripple, Gregory F. Strouse, Weston L. Tew
A variety of alternate calibration schemes which approximate the ITS-90 are possible when using high-purity noble metals. The high purity of the sensor materials allows the use of correlations that exist between the measured properties at fixed point

Thermal Stability of MOCVD and HVPE GaN Layers in H 2 , HCl, NH 3 and N 2

November 1, 2001
Author(s)
M A. Mastro, O M. Kryliouk, M D. Reed, T J. Anderson, Albert Davydov, Alexander J. Shapiro
This work represents a complete study of GaN annealed in H 2, HCl, NH 3 and N 2. The GaN thermal behavior was evaluated by comparison of MOCVD and HVPE samples. The MOCVD films were observed to undergo dissociative sublimation mechanism with only gaseous

Thermodynamic Assessment of the Gallium - Nitrogen System

November 1, 2001
Author(s)
Albert Davydov, William J. Boettinger, Ursula R. Kattner, T J. Anderson
Thermochemical and phase diagram data for the Ga-N system were assessed by employing the CALPHAD method. A consistent model representation of available thermodynamic properties agrees well with the critically evaluated experimental data. Thermodynamic

Thin-Film Elastic-Property Measurements With Laser-Ultrasonic SAW Spectrometry

November 1, 2001
Author(s)
Donna C. Hurley, Vinod K. Tewary, A J. Richards
We have developed laser-ultrasonic methods to evaluate the elastic properties of thin films. Our method, called SAW spectrometry, used broadband surface acoustic waves (SAWs) generated by a line-focused, pulsed laser, SAWs with frequency components up to

Tool Point Frequency Response Prediction for High-Speed Machining by RCSA

November 1, 2001
Author(s)
Tony L. Schmitz, Michael Kennedy, Matthew A. Davies
The implementation of high-speed machining for the manufacture of discrete parts requires accurate knowledge of the system dynamics. We describe the application of receptance coupling substructure analysis (RCSA) to the analytic prediction of the tool
Displaying 44901 - 44925 of 73960
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