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Displaying 45001 - 45025 of 73960

Fraunhofer Diffraction Effects on Total Power for a Planckian Source

October 1, 2001
Author(s)
Eric L. Shirley
An algorithm for computing diffractions effects on total power in the case of Fraunhofer diffraction by a circular lens or aperture is derived. The result for Fraunhofer diffraction of monochromatic radiation is well known, and this reports the result for

Gelation in Physically Associating Polymer Solutions

October 1, 2001
Author(s)
S K. Kumar, Jack F. Douglas
The thermally reversible gelation of a polymer solution is investigated. The dynamics slows down upon cooling in these systems much like glass-firming liquids. We show that no significant changes in the dynamics occurs near the geometrical percolation

Government Roles in HCI

October 1, 2001
Author(s)
Jean C. Scholtz
The chapter describes the key roles that governments play in human-computer interaction: as users of software, producers of information, legislators of standards, and funders of research. For each of these sections the issues involved are described and

Harmonized Conformance Testing for Product Data Managers

October 1, 2001
Author(s)
David Flater, KC Morris
The Testability of Interaction-Driven Manufacturing Systems project seeks to enhance the design-for-testability of specifications for manufacturing software interfaces, derive a test method that is usable for interaction-driven manufacturing systems in

Impacts of Design/Information Technology on Building and Industrial Projects

October 1, 2001
Author(s)
Stephen R. Thomas, C L. Macken, Sanghun Lee
This paper describes a collaborative effort by industry, government, and academia to evaluate the use of design/information technology (D/IT) on building and industrial projects and to relate the degree of use to project performance. A detailed statistical

In Vitro Evaluation of a Calcium Phosphate Cement Root Canal Filler/Sealer

October 1, 2001
Author(s)
Ai-Shuan(Maria) Cherng, Laurence C. Chow, Shozo Takagi
An in vitro dye leakage study was performed to compare the apical leakage of of a fill with injectable calcium phosphate cement (CPC) filler/sealer and a master silver cone with leakage from a fill of Sealapex sealer and laterally condensed gutta-percha

Isochoric Heat Capacity for Toluene Near Phase Transitions and the Critical Point

October 1, 2001
Author(s)
N. G. Polikhronidi, I M. Abdulagatov, Joe W. Magee, Rabiyat G. Batyrova
New measurements of isochoric heat capacity C V for toluene near phase transitions and the critical point are presented. Measurements were made with a high-temperature, high-pressure, adiabatic calorimeter of nearly constant-volume . The inner volume of

Isoplethic Method to Estimate Critical Lines for Binary Fluid Mixtures From Subcritical Vapor-Liquid Equilibrium: Application to the Azeotropic Mixtures R32 + C3 H8 and R125 + C3H8

October 1, 2001
Author(s)
L S. Van Poolen, C D. Holcomb, James C. Rainwater
A new, isoplethic method is used to determine critical lines of azeotropic binary fluid mixtures using vapor-liquid equilibrium data including saturated vapor and liquid densities below the lowest critical temperature of the pure components. Thermodynamic

Luminous Intensity of LEDs at NIST

October 1, 2001
Author(s)
Carl C. Miller, Yoshihiro Ohno
Calibration facilities and procedures for measurement of Averaged LED intensity using the detector-based method have been developed at the National Institute of Standards and Technology (NIST). The scale has been established on two standard photometers

Modeling the Appearance of Special Effect Pigment Coatings

October 1, 2001
Author(s)
Thomas A. Germer, Maria E. Nadal
Metallic and pearlescent coatings are becoming increasingly important in automotive, currency, and cosmetic applications. These coatings consist of metallic or dielectric platelets suspended in a binder, and are often applied between a pigmented underlayer

Molecular Dynamics Study of Partial Monolayer Ordering of Chain Molecules

October 1, 2001
Author(s)
Raymond D. Mountain, Joseph B. Hubbard, Curtis W. Meuse, V Simmons
We present the results of a molecular dynamics study of a partial monolayer of self-assembled octadecanethiol molecules. The correlations between various statistical measures of surface induced chain ordering are examined. These include the density profile

Multispectral Probes for Materials and Chemical Analysis

October 1, 2001
Author(s)
Steven A. Buntin
High throughput experimentation is currently restricted by its limited ability to evaluate more than one parameter of a library at a time (e.g., chemical composition, dielectric constant, refractive index, surface roughness, phase , luminescence). When

Noise Characterization of Multiport Amplifiers

October 1, 2001
Author(s)
James P. Randa
I address the issue of the definition and measurement of noise figure and parameters to characterize multiport devices, particularly differential amplifiers. A parameterization in terms of the noise matrix appears to be the most practical. the noise figure

On the Validity of the Adiabatic Spreading Assumption in Droplet Impact Cooling

October 1, 2001
Author(s)
William M. Healy, J G. Hartley, S I. Abdel-Khalik
The effect of heat transfer on the spreading of a water droplet impacting a heated surface has been numerically investigated. The aim is to assess the validity of commonly made assumptions in spray cooling models which ignore heat transfer during the

Optical Frequency Synthesis Based on Mode-Locked Lasers

October 1, 2001
Author(s)
Steven T. Cundiff, J Ye, John L. Hall
The synthesis of optical frequencies from the primary cesium microwave standard has traditionally been a difficult problem due to the large disparity in frequency, Recently this field has been dramatically advanced by the introduction and use of mode
Displaying 45001 - 45025 of 73960
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