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Displaying 37676 - 37700 of 74089

Probing the Origins and Control of Shrinkage Stress in Dental Resin-Composites. II. Novel Methods of Simultaneous Measurement of Polymerization Shrinkage Stress and Conversion

October 1, 2004
Author(s)
H Lu, J W. Stansbury, Sabine H. Dickens, F Eichmiller, Christopher N. Bowman
In this study, we have probed the interrelationships between polymerization shrinkage stress development and the polymerization progress with a novel experimental technique. This technique is capable of measuring the shrinkage stress, using a cantilever

Resource Planning and Bandwidth Allocation in Hybrid Fiber-Coax Residential Networks

October 1, 2004
Author(s)
David W. Griffith, Kotikalapudi Sriram, L Krivulina, Nada T. Golmie
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

Round Robin Study of Total Heat Flux Gauge Calibration at Fire Laboratories

October 1, 2004
Author(s)
William M. Pitts, A V. Murthy, J L. de Ris, J R. Filtz, K Nyard, D Smith, I Wetterlund
Total heat flux gauges are widely employed in fire research and fire testing laboratories. Several fire laboratories have developed systems for calibrating these gauges. There are major differences between these calibration facilities, and prior to this

Securely Connecting the World with Cyber Security Standards

October 1, 2004
Author(s)
Alicia Clay Jones, Michael Hogan
This paper focuses on some of the key roles that cyber security standards play in securely connecting our cyber world. Cyber security standards can be categorized as technical, management, or testing standards. All three types of standards are necessary to

Securing Voice Over Internet Protocol (IP) Networks

October 1, 2004
Author(s)
Thomas J. Walsh, David R. Kuhn
Voice over IP - the transmission of voice over traditional packet-switched IP networks - is one of the hottest trends in telecommunications. As with any new technology, VOIP introduces both opportunities and problems. Lower cost and greater flexibility are

Shape Analysis of a Reference Cement

October 1, 2004
Author(s)
Edward J. Garboczi, Jeffrey W. Bullard
Recently, techniques for acquiring, analyzing, and using 3-D shape information for aggregates (sand, gravel) have been developed and demonstrated. These mathematical techniques, based on spherical harmonic coefficient analysis, have been applied to x-ray

Static and Quasi-static Calibration of Bio-MEMS Device

October 1, 2004
Author(s)
Andrew J. Slifka, Hrishikesh V. Panchawagh, Roop L. Mahajan, Dudley Finch, R. A. Rorrer
A bio-MEMS device which has been designed to stimulate cells by oscillatory actuation in the vertical direction has been calibrated. The displacement of this device was determined experimentally by a laser interferometer when actuated by a static voltage

Study of a 1D Interacting Quantum Bose Gas

October 1, 2004
Author(s)
B Laburthe, K M. O'Hara, J H. Huckans, M Anderlini, James V. Porto, S L. Rolston, William D. Phillips
The loading of a Bose-Einstein condensate into a deep 2D optical lattice provides a unique way to study 1D Bose gases: the strong radial confinement freezes any motion in two dimensions, and for deep enough lattices, the system can be seen as an array

Task Analysis of Autonomous On-Road Driving

October 1, 2004
Author(s)
Anthony J. Barbera, John A. Horst, Craig I. Schlenoff, David Aha
The Real-time Control System (RCS) Methodology has evolved over a number of years as a technique to capture task knowledge and organize it into a framework conducive to implementation in computer control systems. The fundamental premise of this methodology

The Structural Steel of the World Trade Center Towers

October 1, 2004
Author(s)
Frank W. Gayle, Stephen W. Banovic, Timothy J. Foecke, Richard J. Fields, William E. Luecke, Joseph D. McColskey, Thomas A. Siewert, Christopher N. McCowan
In September 2002, the National Institute of Standards and Technology became the lead agency in an investigation of the World Trade Center (WTC) disaster of September 11, 2001. The investigation addresses many aspects of the catastrophe, from occupant

Traceable Force Metrology for Micronewton Level Calibration

October 1, 2004
Author(s)
Jon R. Pratt, Richard Seugling
The research presented in this abstract concerns the calibration and implementation of a prototype secondary force standard to disseminate the SI (Syst?me International d''unit?s) unit of force ranging from 5.0 mN to 5.0 mN. The elastic-force measuring

Tribochemistry Between Water and Si 3 N 4 and SiC: Induction Time Analysis

October 1, 2004
Author(s)
Richard S. Gates, Stephen M. Hsu
Avanced ceramics are being considered as one of the potential materials for high temperature steam engines. Silicon nitride and silicon carbide have demonstrated in laboratory bench wear tests that under low loads and medium speed conditions, water is an

UML 2 Composition Model

October 1, 2004
Author(s)
Conrad E. Bock
The composition model in the Unified Modeling Language, version 2, is a major upgrade to the familiar black diamond composition of earlier versions. It supports connections between parts at the same level of decomposition, in addition to the usual part

Virtual Surface Calibration and Computational Uncertainty

October 1, 2004
Author(s)
Son H. Bui, Theodore V. Vorburger, Thomas B. Renegar
This paper presents the development of a virtual surface calibration database for parameter evaluation and algorithm verification. The database runs from a web site at the National Institute of Standards and Technology (NIST), USA. Companies, universities
Displaying 37676 - 37700 of 74089