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Displaying 43476 - 43500 of 74893

Longitudinal Spin Waves in a Dilute Bose Gas

June 1, 2002
Author(s)
J E. Williams, T Nikuni, Charles W. Clark
We present a kinetic theory for a dilute noncondensed Bose gas of two-level atoms that predicts the transient spin segregation observed in a recent experiment. The underlying mechanism driving spin currents in the gas is due to a mean-field effect arising

Martensitic Transformations in Constrained Films

June 1, 2002
Author(s)
Alexander L. Roytburd, Julia Slutsker
Polydomain micro- and nano-structures are natural products of phase transformations in solids. The trend to minimize the energy of internal long-range fields (magnetic, electric or mechanical) leads to the formation of the arrangment of domain of different

Materials Design of Ceramic Based Layer Structures for Crowns

June 1, 2002
Author(s)
Brian R. Lawn, Y N. Deng, Isabel K. Lloyd, E D. Rekow, Victoria Thompson
Explicit fracture mechanics relations for the onset of critical damage in crown-like ceramic layers on soft polymeric substrates subjected to contacts loads are presented. Damage modes include cone cracking and quasiplasticity at the top surfaces, and

Measured Versus Predicted Performance of Building Integrated Photovoltaics

June 1, 2002
Author(s)
Mark W. Davis, Arthur H. Fanney, Brian P. Dougherty
The lack of predictive performance tools creates a barrier to the widespread use of building integrated photovoltaic panels. The National Institute of Standards and Technology has created a building integrated photovoltaic (BIPV) test bed to capture

Measurement of Residual Stress in Bent Pipelines

June 1, 2002
Author(s)
G A. Alers, Joseph D. McColskey
Buried gas and oil pipelines can be subjected to unexpected bending loads causedby such earth movements as earthquakes, wash-outs, road building, mining subsidence, etc.as well as by denting from unintentional digging. In order to make a fitness-for

Measuring the Impact of Information on Complex Systems

June 1, 2002
Author(s)
Larry H. Reeker, Albert W. Jones
The application of power-driven machinery to manufacturing and other areas of human endeavor characterized the Industrial Revolution in the 18th and 19th centuries. Measurement contributed in many ways to the increasing economic influence of these machines

Microfluidic Temperature Gradient Focusing

June 1, 2002
Author(s)
David J. Ross, Laurie E. Locascio
A new technique is described for the concentration and separation of ionic species in a microchannels. Concentration is achieved by balancing the electrophoretic velocity of an analyte against the bulk flow of solution in the presence of a temperature

Modeling CPU Demand in Heterogeneous Active Networks

June 1, 2002
Author(s)
V Galtier, Kevin L. Mills, Y Carlinet
Active-network technology envisions deployment of virtual execution environments within network elements, such as switches and routers. As a result, application-specific processing can be applied to network traffic. To use such technology safely and

Multizone Modeling Approaches to Contaminant-Based Design

June 1, 2002
Author(s)
A L. Musser, Andrew K. Persily
Indoor air quality is currently addressed in the design process primarily through prescriptive building codes based on specified flow rates. However, a contaminant-based design approach opens the door to design innovation, offering opportunities for

Nonresonant Effects in One- and Two-Photon Transitions

June 1, 2002
Author(s)
U Jentschura, Peter J. Mohr
We investigate nonresonant contributions to Rayleigh scattering cross sections in atomic transitions. The problematic nonresonant contributions set a limit to the accuracy to which atomic spectra determine energy levels. Specifically, we show that off

On Differential Thermal Analyzer Curves for the Melting and Freezing of Alloys

June 1, 2002
Author(s)
William J. Boettinger, Ursula R. Kattner
A model for the response of differential thermal analysis measurement techniques to melting and freezing is explored. The model, which uses a system of ordinary differential equations, predicts sample, sample cup and thermocouple temperature histories

Phase-Coherent Synthesis of Optical Frequencies and Waveforms

June 1, 2002
Author(s)
Jun Ye, Steven T. Cundiff, S M. Foreman, T M. Fortier, John L. Hall, K W. Holman, D J. Jones, J D. Jost, H C. Kapteyn, K A. Leeuwen, L -. Ma, M M. Murnane, J L. Peng, R K. Shelton
Precision phase control of an ultrawide-bandwidth optical-frequency comb has produced remarkable and unexpected progress in both areas of optical-frequency metrology and ultrafast optics. A frequency comb (with 100 MHz spacing) spanning an entire optical

PMD Measurement Techniques - Avoiding Measurement Pitfalls

June 1, 2002
Author(s)
Paul A. Williams
Polarization-mode dispersion (PMD) is an interesting phenomenon. Unfortunately, interesting usually means complicated, and that is definitely the case with PMD. These complications can be troublesome when attempting to measure PMD. This presentation has

Polymer Composites with High Dielectric Constant

June 1, 2002
Author(s)
C. K. Chiang, R Popielarz
A very high dielectric constant polymer composite film system is presented. The new polymer composite film uses cyanoresin polymer filled with ferroelectric ceramics, such as BaTiO 3 powder. While the dielectric constant of the cyanoresin polymer at 1 kHz

Proceedings of the 12th Halon Options Technical Working Conference

June 1, 2002
Author(s)
Richard G. Gann
This proceedings contains the papers from the 12th Halon Options Technical Working Conference. The topics covered include: results from the DoD Next Generation Fire Suppression Technology Program, total flood applications, passive fire protection
Displaying 43476 - 43500 of 74893