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Displaying 41151 - 41175 of 74384

Angular Response Characteristics of Ellipsoidal Radiometers

August 1, 2003
Author(s)
A V. Murthy, D P. DeWitt, Gerald T. Fraser
This paper presents an experimental study of the angular response of an ellipsoidal radiometer performed using a 25 mm diameter variable temperature blackbody as a radiant source. The radiometer consists of a highly reflective ellipsoidal cavity with a

Atomistic Description of the Electronic Structure of T-Shaped Quantum Wires

August 1, 2003
Author(s)
Javier Aizpurua, G C. Bryant, W Jaskolski
We use an atomistic tight-binding theory to study arrays of T-shaped GaAs/AlGaAs quantum wires. An atomistic approach allows us to provide a theory of the electron and hole states in T-shaped wires without the approximations that limit the effective mass

Comparison of Concrete Rheometers.

August 1, 2003
Author(s)
Chiara F. Ferraris, L E. Brower
Concrete mixtures require sufficient workability for proper placement. In particular, sprayed, pumped and self-compacting concretes require careful definition and control of their flow properties to produce good workability. The American Concrete Institute

Comparison of Measured and Predicted Tracer Gas Concentrations in a Townhouse

August 1, 2003
Author(s)
Steven J. Emmerich, Steven J. Nabinger, A Gupte, Cynthia H. Reed, L A. Wallace
To further validate the use of the multizone airflow and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF6), was manually injected within one room of the house and

Criteria for Water Closet Test Standard--A Survey

August 1, 2003
Author(s)
L S. Galowin, R Hill
Waste loads require test representations with artifacts for actual load which have not achieved researchers' consensus for wide recognition. Disparate practices exist throughout the world for test materials, quantity and load extraction acceptance criteria

Data Driven Design and Simulation System Based on XML

August 1, 2003
Author(s)
Guixiu Qiao, Frank H. Riddick, Charles R. McLean
Implementing a highly flexible manufacturing approach, like mass customization manufacturing, demands an integrated design and simulation system. This system must be able to cope with difficult issues such as a high level of product variety, uncertainty in

Design and Characterization of a Photometer/Colorimeter Standard

August 1, 2003
Author(s)
J Racz, George P. Eppeldauer
A photometer/tristimulus colorimeter has been developed at the National Institute of Standards and TEchnology (NIST) to realize a color scale. A novel construction was developed to implement the spectral responsivity based scale with small uncertainty. The

Designing Damage-Resistant Brittle-Coating Structures: I. Bilayers

August 1, 2003
Author(s)
P Miranda, Antonia Pajares, F Guiberteau, Y N. Deng, Brian R. Lawn
A FEA study of coating/substrate bilayers is conducted as a foundation for damage analysis. Attention is focused on the stresses along the contact axis immediately adjacent to the bilayer interface, where radial cracking or yield in the coating, or yield

Designing Damage-Resistant Brittle-Coating Structures: II. Trilayers

August 1, 2003
Author(s)
P Miranda, Antonia Pajares, F Guiberteau, Y N. Deng, H Zhao, Brian R. Lawn
An extension of the FEA-based damage analysis for bilayers in Part I is presented for trilayers consisting of a functional outer layer on an underlying substrate with an intermediate inner core layer. The inner core layer may be used to enhance bonding or

Dielectric Properties of Layer Polymer Films

August 1, 2003
Author(s)
W Sakai, T Yoshiji, N Tsutsumi, C. K. Chiang
Electrical property of thin polymer film is a key parameter for designing new highspeed circuit devices in high frequency and for developing smaller devices and all polymer electrical chips. In this study, we made a three-layered film structure, ABA , to

Effects of Non-Uniform Air Flow on Finned-Tube Evaporator Performance

August 1, 2003
Author(s)
John Choi, William V. Payne, Piotr A. Domanski
An experimental investigation was implemented to determine the capacity degradation due to non-uniform refrigerant and air flow distributions, and to assess the potential to recover the lost capacity via controlling refrigerant distribution between

Elastic Constants of Natural Quartz

August 1, 2003
Author(s)
Paul R. Heyliger, H M. Ledbetter, Sudook A. Kim
We measured the elastic constants of a natural-quartz sphere using resonance-ultrasound spectroscopy (RUS). Our measurements of the near-traction-free vibrational frequencies of the sphere are matched with the predicted frequencies from the dynamic theory

Evaluation of Intelligent Information Access Systems

August 1, 2003
Author(s)
Jean C. Scholtz
This paper discusses traditional evaluations for information access systems and proposes metrics more suited for evaluation of intelligent information access systems.

Flexural Strengthening of Masonry Walls with External Composite Bars

August 1, 2003
Author(s)
K K. Bajpai, Dat Duthinh
The strengthening of epoxy with milled glass fibers allows full strength development of #2 glass FRP bars in 200 mm or half a concrete masonry unit length. This fiber-reinforced epoxy should be effective for other types of bars as well.With full anchorage

Fundamental Aspects of the Application of Carbon Dioxide in Comfort Cooling

August 1, 2003
Author(s)
J S. Brown, Piotr A. Domanski
This paper presents entropy generation analyses for the evaporator, compressor, gas cooler, expansion device and liquid-line suction-line heat exchanger for a transcritical carbon dioxide cycle for automotive and residential air-conditioning systems, and
Displaying 41151 - 41175 of 74384
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