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Displaying 44276 - 44300 of 74359

Optical Flow Cell and Apparatus for Solubility, Salt Deposition and Raman Spectroscopic Studies in Aqueous Solutions Near the Water Critical Point

February 1, 2002
Author(s)
Wilbur S. Hurst, M S. Hodes, Walter J. Bowers Jr., Vern E. Bean, James E. Maslar, P Griffith, K A. Smith
A flow cell fitted with large diameter optical ports suitable for visual observation and Raman spectroscopic studies of aqueous solutions to temperatures of 500 C and pressures to 25 MPa is described. The cell uses commercially available compression

Optimizing a Phase Gate Using Quantum Interference

February 1, 2002
Author(s)
E Charron, Eite Tiesinga, F H. Mies, Carl J. Williams
A controlled interference is proposed to reduce, by two orders of magnitude, the decoherence of a quantum gate for which the gate fidelity is limited by coupling to states other than the |0> and |1> qubit states. This phenomenon is demonstrated in an

Parallelization and Visualization of Computational Nanotechnology LCAO Method

February 1, 2002
Author(s)
J C. Franiatte, Steven G. Satterfield, Garnett W. Bryant, J E. Devaney
Accurate atomic-scale quantum theory of nanostructures and nanosystems fabricated from nanostructures enables precision metrology of these nanosystems and provides the predictive, precision modeling tools needed for engineering these systems for

Performance Evaluation of Autonomous Mobile Robots

February 1, 2002
Author(s)
Adam S. Jacoff, Elena R. Messina, John Evans
The National Institute of Standards and Technology (NIST) has initiated a program to develop quantitative metrics for machine intelligence. One of the possible approaches to evaluating machine intelligence is task-based performance testing, like a mouse in

Pilot-Assisted 16-Level QAM for Wireless Video

February 1, 2002
Author(s)
Hamid Gharavi
This paper presents a twin-class transmission system for narrowband radio access channels suitable for handheld video phone and multimedia portable PC applications. The transmission system is comprised of a hierarchical 16-QAM modulation technique and a

Quantum Logic for Trapped Atoms Via Molecular Hyperfine Interactions

February 1, 2002
Author(s)
G K. Brennen, I H. Deutsch, Carl J. Williams
We study the deterministic entanglement of a pair of neutral atoms trapped in an optical lattice by coupling to excited-state molecular hyperfine potentials. Information can be encoded in the ground-state hyperfine levels and processed by bringing atoms

SCUBA-2: Application of LTD Technology

February 1, 2002
Author(s)
William Duncan, Wayne Holland, Damian Audley, D R. Kelly, Tully Peacock, Peter Hastings, Michael MacIntosh, Kent D. Irwin, Sae Woo Nam, Gene C. Hilton, Steven Deiker, Anthony Walton, Alan Gundlach, William Parkes, Camilla Dunare, Peter Ade, Ian Robson
We outline the need for SCUBA 2, its goals and specifications. We give reasons for the choice of the low temperature detector technology of TES arrays and SQUID multiplexers and describe our pixel and array architecture and progress on the project to date.

Sol-Gel Materials for Gas Phase Sensing Using Microhotplate Arrays

February 1, 2002
Author(s)
N O. Savage, Richard E. Cavicchi, Michael J. Tarlov, Stephen Semancik, J Greg Gillen
Sol-gel chemistry is used to create suspensions (sols) of small particles of materials such as metal oxides. These suspensions can be dried to a gel or powder or used in the sol form for coatings and thin films. One promising application of sol-gel derived

Stray Light Characterization for MOBY

February 1, 2002
Author(s)
Bettye C. Johnson, Steven W. Brown, Keith R. Lykke, M Feinholz, M Yarbrough, S Flora, D K. Clark
The Marine Optical Spectrograpli (MOS) system is used as a down-welling irradiance and up-welling in-water radiance profiler in two configurations: as the sensor for the Marine Optical Buoy (MOBY) and as a mobile, sliipboard-deployable sensor. Both systems

Stream Tables

February 1, 2002
Author(s)
Allan Harvey
This article explains steam tables at an introductory technical level. After some historical meterial on the development of steam tables and their international standardization, the current standrds as adopted by the International Association for the

Structure of Escherichia Coli Aminodeoxychorismate Synthase: Architectural Conservation and Diversity in Chorismate-Utilizing Enzymes

February 1, 2002
Author(s)
J F. Parsons, P Y. Jensen, A S. Pachikara, A J. Howard, Edward Eisenstein, Jane E. Ladner
Aminodeoxychorismate synthase is part of a heterodimeric complex that catalyzes the two-step biosynthesis of 4-amino-4-deoxychorismate, a precursor of p-aminobenzoate and folate in microorganisms. In the first step, a glutamine amidotransferase encoded by

The NIST Electron Effective-Attenuation-Length Database

February 1, 2002
Author(s)
Cedric J. Powell, Aleksander Jablonski
The NIST Electron Effective-Attenuation-Length Database provides values of electron effective attenuation lengths (EALs) in solid elements and compounds at selected electron energies between 50 eV and 2,000 eV. The database was designed mainly to provide

The Validation of Fourier-Transform Microwave Spectroscopy for Trace-Gas Analysis

February 1, 2002
Author(s)
Pamela M. Chu, R D. Suenram, Angela R. Hight Walker, R S. DaBell, George C. Rhoderick, Gerald T. Fraser
There is strong interest by regulatory agencies and automobile manufacturers, motivated in large part by increasingly stringent emission standards, for measurement tools capable of quantifying various hydrocarbons, oxygenated hydrocarbons, etc., in
Displaying 44276 - 44300 of 74359
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