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Displaying 37076 - 37100 of 74045

Strongly Inhibited Transport of a Degenerate 1D Bose Gas in a Lattice

April 1, 2005
Author(s)
C Fertig, K M. O'Hara, J H. Huckans, S L. Rolston, William D. Phillips, James V. Porto
We report the observation of strongly damped dipole oscillations of a quantum degenerate 1D atomic Bose gas in a combined harmonic and optical lattice potential. Damping is significant for very shallow axial lattices (0.25 photon recoil energies), and

The Fast Fourier Transform for Experimentalists, Part I: Concepts

April 1, 2005
Author(s)
D Donnelly, Bert W. Rust
The discrete Fourier transform (DFT) is a widely used tool for the analysis of measured time series data. The Cooley-Tukey fast Fourier transform (FFT) algorithm gives an extremely fast and efficient implementation of the DFT. This is the first of a series

The OATS Method Revisited

April 1, 2005
Author(s)
Christopher L. Holloway, Perry F. Wilson, Robert German
Open area test sites (OATS) or equivalent semi-anechoic chambers are the most commonly used sites for EMC emissions tests. This article discusses the origins of this test methodology and revisits the interference problem (broadcast media) that the OATS

The TREC Ad Hoc Experiments

April 1, 2005
Author(s)
Donna K. Harman
Ad hoc retrieval is the prototypical search engine task: searching a static set of documents with a previouslyunseen query. The ad hoc task was one of the first two tasks tackled in TREC and was run for eight years, representing hundreds of experiments

The TREC Test Collections

April 1, 2005
Author(s)
Donna K. Harman
The creation of a set of large, unbiased test collections has been critical to the success of TREC. This chapteris the documentation for the TREC collections. It reviews the motivation for building the collections, describes the methods used to create them

Ultracold Fermion Cooling Cycle Using Heteronuclear Feshbach Resonances

April 1, 2005
Author(s)
M A. Morales, N Nygaard, J E. Williams, Charles W. Clark
We consider an ideal gas of Bose and Fermi atoms in a harmonic trap, with a Feshbach resonance in the interspecies atomic scattering that can lead to formation of fermionic molecules. We map out the phase diagram for this three-component mixture in

UML 2 Activity and Action Models, Part 6: Structured Activities

April 1, 2005
Author(s)
Conrad E. Bock
This is the sixth in a series introducing the activity model in the Unified Modeling Language, version 2 (UML 2), and how it integrates with the action model [1]. The first article gives an overview of activities and actions [2], while the next four cover

X-Ray Absorption Imaging of High-Pressure Lighting Plasmas

April 1, 2005
Author(s)
John J. Curry, Craig J. Sansonetti
X-ray absorption has been used to image the distribution of Hg in high-pressure arc lamps used for lighting (Curry, Sansonetti, and Wang, in progress). Here, several images are presented showing the analytic transformation of raw x-ray data into an image

Finite-temperature modeling of nanoscale spin-transfer oscillators

March 31, 2005
Author(s)
Stephen E. Russek, Shehzaad F. Kaka, William Rippard, Matthew Pufall, Thomas J. Silva
Magnetization dynamics induced by spin-polarized currents in magnetic nanodevices have been numerically simulated using a single-domain model proposed by Slonczewski extended to include temperature effects. For currents with a spin polarization

Thermodynamic Properties of Diphenylmethane

March 30, 2005
Author(s)
Robert D. Chirico, William Steele
Measurements leading to the calculation of the standard thermodynamic properties for gaseous diphenylmethane (Chemical Abstracts registry number [101-81-5]) are reported. Experimental methods include adiabatic heat-capacity calorimetry, vibrating-tube

Simultaneous Visible and Thermal Imaging of Metals During Machining

March 28, 2005
Author(s)
Eric P. Whitenton, Robert W. Ivester, Howard W. Yoon
In order to investigate temperatures reached during orthogonal metal cutting, a novel approach for measuring temperatures at the tool-chip interface has been developed based on high-speed thermography. A thermal infrared camera and a visible camera
Displaying 37076 - 37100 of 74045
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