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Displaying 49076 - 49100 of 74089

Thermophysical Properties of Process Gases

November 1, 1999
Author(s)
John J. Hurly, Michael R. Moldover
We measured the speed of sound in the process gases Cl 2, HBr, BCl 3, and in the surrogate gases SF 6, CF 4, and C 2F 6. The data range up to 475 K (200 C) and from 25 kPa to 1500 kPa (or to 80% of the vapor pressure for condensable gases). The data were

Towards Quantum Degeneracy of Bosonic and Fermionic Potassium Atoms

November 1, 1999
Author(s)
F S. Cataliotti, Eric A. Cornell, C Fort, M Inguscio, M Prevedelli, G M. Tino
These notes are devoted to a discussion of the results we obtained during the last two years in experiments of confinement and cooling of bosonic and fermionic potassium atoms towards quantum degeneracy. Further details on these experiments can be found in

Supporting Relationships in Access Control Using Role Based Access Control

October 29, 1999
Author(s)
John Barkley, Konstantin Benznosov, Jinny Uppal
The Role Based Access Control (RBAC) model and mechanism have proven to be useful and effective. This is clear from the many RBAC implementations in commercial products. However, there are many common examples where access decisions must include other

Y2K Embedded System Testing Guidelines

October 27, 1999
Author(s)
G E. Fisher, M Cherry
Guidelines for what to test in the embedded systems world are presented with respect to the year 2000 problem.

Characteristic Impedance of Microstrip on Silicon

October 25, 1999
Author(s)
Dylan F. Williams, Bradley K. Alpert
We compare power-voltage, power-current, and causal definitions of the characteristic impedance of microstrip transmission lines on silicon substrates.

Characteristic impedance of microstrip on silicon

October 25, 1999
Author(s)
Dylan F. Williams, Bradley K. Alpert
In this paper, we compare the power-voltage, power-current, and causal definitions of the characteristic impedance of microstrip transmission lines on silicon substrates.

Overview of the Sixth Text REtrieval Conference (TREC-6)

October 25, 1999
Author(s)
Ellen M. Voorhees, Donna K. Harman
The Text REtrieval Conference is a workshop series designed to encourage research on text retrieval for realistic applications by providing large test collections, uniform scoring procedures, and a forum for organizations interested in comparing results

Scratch Damage in Zirconia Ceramics

October 25, 1999
Author(s)
S K. Lee, Rajan Tandon, M Readey, Brian R. Lawn
Scratch damage modes in zirconia-based ceramics, Mg-PSZ, T-TZP and Ce-TZP are investigated. Precursor indentation tests with a tungsten carbide sphere foreshadow the nature of damage: in Mg-PSZ - extensive quasi-plastic deformation in the region outside

TREC-6 1997 Spoken Document Retrieval Track Overview and Results

October 25, 1999
Author(s)
John S. Garofolo, Ellen M. Voorhees, Vincent M. Stanford, K Sparck Jones
This paper describes the 1997 TREC-6 Spoken Document Retrieval (SDR) Track which implemented a first evaluation of retrieval of broadcast news excerpts using a combination of automatic speech recognition and information retrieval technologies. The

Polymer Layered-Silicate Nanocomposites: Polyamide-6, Polypropylene and Polystyrene

October 24, 1999
Author(s)
Jeffrey W. Gilman, A B. Morgan, Richard H. Harris Jr., E Manias, E P. Giannelis, M Wuthenow
In many of the cases studied, polymer-clay nanocomposites are materials that have improved thermal properties. Furthermore, most of the nanocomposite systems reported so far show reduced flammability. The delaminated versions of nanocomposites also offer

A Simple and Powerful Heuristic for Speeding Up Force-Directed Graph Layout

October 20, 1999
Author(s)
John V. Cugini, D L. Banks
Force-directed layout is a commonly used technique to generate visually pleasing representations of graphs. The calculation time for direct implementation is, however, proportional to the square of the number of nodes, thus limiting its usefulness to small

Energy Conserving Discrete Equation for Non-Ideal Systems

October 20, 1999
Author(s)
Nicos Martys
The BBGKY formalism is utilized to obtain a set of moment equations to be satisfied so as to obtain an energy conserving discrete Boltzmann equation for the case of a non-local interaction potential. A modified BGK form of the collision operator consistent

Towards a Measurement Technique for Risk Management

October 20, 1999
Author(s)
D G. Marks
The field of computer security is impeded by a lack of objective, quantitative measures. As a result, most systems, whether theoretical or actual, attempt to avoid, rather than manage, risk. Risk management requires looking at the complete protect, detect

Statistical Testing of Random Number Generators

October 19, 1999
Author(s)
D L. Banks
Random Number Generators (RNGs) are an important building block for algorithms and protocols in cryptography. They are paramount in the construction of encryption keys and other cryptographic algorithm parameters. In practice, statistical testing is

Status of the Advanced Encryption Standard (AES) Development Effort

October 19, 1999
Author(s)
James Foti
The purpose of this presentation will be to articulate the status of NIST=s Advanced Encryption Standard (AES) development effort. This presentation will include a description of the overall AES development effort, a summary of comments and analysis from

SURF III - A New Electron Storage Ring at NIST

October 15, 1999
Author(s)
R A. Bosch, D E. Eisert, Mitchell L. Furst, R M. Graves, L Greenler, A D. Hamilton, L R. Hughey, R P. Madden, P Robl, Ping-Shine Shaw, W S. Trzeciak, Robert E. Vest, D Wahl
The National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS), has operated the Synchrotron Ultraviolet Radiation Facility (SURF), based on an electron accelerator, continuously since the early 1960's. SURF I

Benchmark Database for Input and Validation of Multiphase Combustion Models.

October 11, 1999
Author(s)
J F. Widmann, S R. Charagundla, Cary Presser
Control of process efficiency and the formation of species byproducts from industrial thermal oxidation systems (e.g., power generation and treatment of liquid chemical wastes), is generally based on a priori knowledge of the input stream physical and
Displaying 49076 - 49100 of 74089