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Displaying 37651 - 37675 of 74292

A New 'Wrinkle' in Nanometrology

November 1, 2004
Author(s)
Christopher M. Stafford
Nanotechnology promises to revolutionize a growing set of materials applications ranging from electronics to drug delivery to ballistic protection. However, the quest to engineer mate-rials on the nanoscale (e.g., in the form of ultrathin films) is met

A Water Setting Tetracalcium Phosphate- Dicalcium Phosphate Dihydrate Cement

November 1, 2004
Author(s)
Elena F. Burguera, F Guitian, Laurence C. Chow
This paper reports the development of a calcium phosphate cement, comprising tetracalcium phosphate (TTCP) and dicalcium phosphate dihydrate (DCPD), that hardens in 14 min with water as the liquid or 6 min with a 0.25 mol/L sodium phosphate as the liquid

Ad-hoc Network Systems and Applications

November 1, 2004
Author(s)
Hamid Gharavi
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

Alterations in Water Structure Induced by Guanidinium and Sodium Ions

November 1, 2004
Author(s)
Raymond D. Mountain, D Thirumalai
Using molecular dynamics simulations we have probed the ion-induced changes in the water structure as the concentration of ion is varied. We consider two ions, namely, sodium chloride and guanadinium chloride. As the concentration of sodium ions, Na^+, is

An Architecture and Interfaces for Distributed Manufacturing Simulation

November 1, 2004
Author(s)
Charles R. McLean, Frank H. Riddick, Yung-Tsun Lee
This paper presents an overview of a neutral reference architecture and data model for integrating distributed manufacturing simulation systems with each other, with other manufacturing software applications, and with manufacturing data repositories. Other

Attack vs. Countermeasure Effectiveness (ACE): Modeling Tool for BGP

November 1, 2004
Author(s)
Kotikalapudi Sriram, Douglas Montgomery, D. Richard Kuhn
We examine the performance of multimodal biometric authentication systems using state-of-the-art Commercial Off-the-Shelf (COTS) fingerprint and face biometric systems on a population approaching 1,000 individuals. Majority of prior studies of multimodal

Autonomy Measures for Robots

November 1, 2004
Author(s)
Hui-Min Huang, Elena R. Messina, R C. Wade, W English, B Novak, James S. Albus
Robots are becoming increasingly autonomous. Yet, there are no commonly accepted terms and measures of just how autonomous a robot is. An ad hoc working group has been formed to address these deficiencies, focusing on the unmanned vehicles domain. This

Characterizing Rockwell Diamond Indenters Using Depth of Penetration

November 1, 2004
Author(s)
R -. Ellis, P Mumford, Samuel Low, A Knott
Diamond indenters used in a Rockwell hardness tester can dramatically affect the performance of the test. For this reason, it is important to find a method that can characterize the indenter. Current methods of verifying diamond indenter geometry have

Control of Surface Properties Using Fluorinated Polymer Brushes Produced by Surface-Initiated Controlled Radical Polymerization

November 1, 2004
Author(s)
L Andruzzi, A Hexemer, X Li, Christopher K. Ober, E K. Kramer, Giancarlo Galli, E Chiellini, Daniel A. Fischer
Surface-grafted styrene-based homopolymer and diblock copolymer brushes bearing semifluorinated alkyl groups were synthesized by nitroxide-mediated controlled radical polymerization on planar silicon oxide surfaces. The polymer brushes were characterized

Design for a multifrequency high magnetic field superconducting quantum interference device-detected quantitative electron paramagnetic resonance probe: Spin-lattice relaxation of cupric sulfate pentahydrate (CuSO 4 &#82265H 2 O

November 1, 2004
Author(s)
Brant Cage, Stephen E. Russek
We have designed a spectrometer for the quantitative determination of electron paramagnetic resonance (EPR) at high magnetic fields and frequencies. It uses a superconducting quantum interference device (SQUID) for measuring the magnetic moment as a

Determining the Uncertainty of X-Ray Absorption Measurements

November 1, 2004
Author(s)
G S. Wojcik
X-ray absorption techniques have become more common and more accepted in the study of moisture contents and transport in building materials like cement pastes, mortars, and wood. To be able to properly interpret the data gathered by the machine, it is
Displaying 37651 - 37675 of 74292