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Displaying 42026 - 42050 of 74203

Bogoliubov Approach to Superfluidity of Atoms in an Optical Lattice

January 1, 2003
Author(s)
A M. Rey, Karen G. Burnett, R Roth, M Edwards, Carl J. Williams, Charles W. Clark
We use the Bogoliubov theory of atoms in an optical lattice to the study the approach to the Mott-insulator transition. We derive an explicit expression for the superfluid density based on the rigidity of the system under phase variations. This enables us

Broadband Characterization of Optoelectronic Components to 65 GHz Using VNA Techniques

January 1, 2003
Author(s)
M M. Maska, Jon Martens, Tracy S. Clement, Paul D. Hale, Dylan Williams
This paper discusses the typical uncertainties associated with characterizing high speed photodiodes to 65 GHz when using a vector network analyzer measurement technique. We analyzed the accuracy of the technique by comparing measurements of two reference

Building Blocks for a Scalable Quantum Information Processor Based On Trapped Ions

January 1, 2003
Author(s)
Dietrich G. Leibfried, Murray D. Barrett, A Ben-kish, Joseph W. Britton, J Chiaverini, B. L. DeMarco, Wayne M. Itano, Branislav M. Jelenkovic, John D. Jost, Christopher Langer, D Lucas, V Meyer, Till P. Rosenband, M A. Rowe, T Schaetz, David J. Wineland
We describe the underlying concept and experimental demonstration of the basic building blocks of a scalable quantum information processor architecture using trapped ion-qubits. The trap structure is divided into many subregions. In each several ion-qubits

Bullet Signature Measurements at NIST

January 1, 2003
Author(s)
Jun-Feng Song, Li Ma, Eric P. Whitenton, Theodore V. Vorburger
The RM (Reference Material) 8240 standard bullets are currently under development at the National Institute of Standards and Technology 9NIST) to support the coming National Integrated Ballistics Information Network (NIBIN). A bullet signature measurement

Calibrated thermal microscopy of the tool-chp interface in machining

January 1, 2003
Author(s)
Matthew A. Davies, Howard W. Yoon, Tony L. Schmitz, Timothy J. Burns, Michael Kennedy
This paper presents the results of calibrated, microscopic measurement of the temperature fields at the tool-chip interface during the steady-state, orthogonal machining of AISI 1045 steel. The measurement system consists of a nearly diffraction limited

CFD MODELING OF FIRE SUPPRESSION AND ITS ROLE IN OPTIMIZING SUPPRESSANT DISTRIBUTION

January 1, 2003
Author(s)
J C. Hewson, S R. Tieszen, W D. Sundberg, P E. DesJardin
Recent developments in suppression modeling for CFD codes are presented with an emphasis on fire suppression in cluttered environments. Suppression modeling is based on the ratio between the fluid mixing time scale and the flame chemical time scale. Flames
Displaying 42026 - 42050 of 74203
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