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Displaying 49676 - 49700 of 74070

Bursting Bubbles From Combustion of Thermoplastic Materials in Microgravity

May 18, 1999
Author(s)
Kathryn M. Butler
Many thermoplastic materials in common use for a wide range of applications, including spacecraft, develop bubbles internally as they bum due to chemical reactions taking place within the bulk. These bubbles grow and migrate until they burst at the surface

A Framework for Throughput and Stability Analysis of a DS-CDMA Network

May 17, 1999
Author(s)
Vladimir V. Marbukh, Nader Moayeri
We propose a framework for throughput and stability analysis of a Direct Sequence Code Division Multiple Access (DS-CDMA) network. Given chip rate, processing gains, packet structure, coding scheme, and the characteristics of the wireless channel, we

Solution of the Boltzmann Equation Without the Relaxation Time Approximation

May 15, 1999
Author(s)
David R. Penn, Mark D. Stiles
A method is presented for solving the spatially varying Boltzmann equation without the relaxation time approximation. The solution is compared with that obtained using the relaxation time approximation for free electron solids in the presence of boundaries

Visualization of Search Results: A Comparative Evaluation of Text, 2D, and 3D Interfaces

May 15, 1999
Author(s)
M M. Sebrechts, J Vasilakis, M S. Miller, John V. Cugini, Sharon J. Laskowski
Although there have been many prototypes of visualization in support of information retrieval, there has been little systematic evaluation that distinguishes the benefits of the visualization per se from that of various accompanying features. The current

A Liquefaction Evaluation Procedure Based on Shear Wave Velocity

May 14, 1999
Author(s)
R D. Andrus, K H. Stokoe
This paper outlines a procedure for evaluating liquefaction resistance of soils using shear wave velocity measurements. The procedure follows the general format of the Seed-Idriss simplified procedure based on SPT blow count. It was developed following

A Statistical Text-To-Phone Function Using Ngrams and Rules

May 10, 1999
Author(s)
W M. Fisher
Adopting concepts from statistical language modeling and rule-based transformations can lead to effective and efficient text-to-phone (TTP) functions. We present here the methods and results of one such effort, resulting in a relatively compact and fast

Cyclic Contact Fatigue of Brittle Ceramics

May 10, 1999
Author(s)
Brian R. Lawn, Yeon-Gil G. Jung, D H. Kim, S K. Lee, I M. Peterson
Contact damage modes in cyclic loading with spheres are investigated in several ceramics, principally silicon nitride but also some ceramics used for dental restorations. Initial damage to small numbers of cycles and low loads consists of tensile-driven

Modem Design Issues in LMDS Systems

May 8, 1999
Author(s)
J E. Haakegaard
During the last 2-3 years, there has been considerable activity aimed towards deploying broadband wireless access systems. The US Local Multipoint Distribution Services (LMDS) auctions in February-March 1998 of 1.3 GHz of spectrum between 27.5 GHz and 31.3

Construction Metrology Beyond Earth: A White Paper

May 6, 1999
Author(s)
D T. Latimer
Construction metrology standardization research currently focuses on terrestial applications. For space based applications, there is the potential for great monetary and effort savings through the creation of open industry standards. Current technology for

Polymer Mobility Near the Polymer/Solid Interface

May 6, 1999
Author(s)
Eric K. Lin, Wen-Li Wu, Sushil K. Satija, R Kolb
Neutron reflectometry is used to measure polymer mobility near an attractive solid surface over distances less than the bulk polymer radius of gyration, R g. Effective diffusion coefficients, D eff, are determined from the rates of interdiffusion between

VISVIP: 3D Visualization of Paths Through Websites

May 5, 1999
Author(s)
John V. Cugini
VISVIP allows website developers to visualize the paths taken through a website by the subjects of usability experiments. The user can dynamically customize and simplify the graphical layout of the website, and select which subjects paths to view. The user

The International Institute of Welding: Report on 1998 Actions

May 3, 1999
Author(s)
Thomas A. Siewert
Commission V covers issues of weld inspection and quality control for the International Institute of Welding (IIW). This report summarizes the information presented at the 1998 Annual Assembly: descriptions of both research and draft ISO standards being

0.1-10 GHZ CMOS Voltage Standard

May 1, 1999
Author(s)
Dylan F. Williams, Dave K. Walker
We discuss the development of a sinusoidal CMOS voltage standard. The standard incorporates a FET power sensor that transfers the voltage measured at a primary standards laboratory to a user’s laboratory. We anticipate an absolute accuracy of about 10 mV
Displaying 49676 - 49700 of 74070