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Displaying 47576 - 47600 of 73969

Waveguide Atom Beam Splitter for Laser-Cooled Neutral Atoms

September 1, 2000
Author(s)
D Muller, Eric A. Cornell, M Prevedelli, P Schwindt, A A. Zozulya, D Z. Anderson
A laser-cooled neutral-atom beam from a low-velocity intense source is split into two beams while it is guided by a magnetic-field potential. We generate our multimode beam-splitter potential with two current-carrying wires upon a glass substrate combined

XML Technologies

September 1, 2000
Author(s)
Mary C. Brady, Carmelo Montanez-Rivera, Richard M. Rivello, Lisa J. Carnahan
An Internet language called the Extensible Markup Language (XML) is rapidly becoming one of the most popular languages in the world. XML is being incorporated into many Internet Web pages and applications; it is particularly useful for those involving

Meeting the Metrology Needs of the Microdisplay Industry

August 31, 2000
Author(s)
Paul A. Boynton, Edward F. Kelley, John M. Libert
Measuring the optical characteristics of microdisplays produce challenges to traditional display metrology. When using light-measuring devices to measure scenes having high contrasts or wide color variations, they suffer the effects of veiling glare or

Nanotechnology for Next-Generation Josephson Voltage Standards

August 30, 2000
Author(s)
Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
We have developed two voltage standard systems: the programmable Josephson voltage standard and the Josephson arbitrary waveform synthesizer. The programmable system is fully automated and provides stable programmable DC voltages from -1.2 V to +1.2 V. The

Features of Intelligence Required by Unmanned Ground Vehicles

August 16, 2000
Author(s)
James S. Albus
A definition of intelligence is given in terms of performance that can be quantitatively measured. Behaviors required of unmanned ground vehicles are described and computational requirements for intelligent control at seven hierarchical levels in a

Web Usability Logging: Tools and Formats

August 15, 2000
Author(s)
John V. Cugini
Systematic usability studies of web-based applications require software tools and data standards to support both the capture and representation of users' activities. Web logging tools can be based within the browser, the website, or the underlyingserver

Low Harmonic Distortion in a Josephson Arbitrary Waveform Synthesizer

August 14, 2000
Author(s)
Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus
The use of broadband integrated filters has enabled practical operating margins for ac waveforms synthesized from the perfectly quantized voltage pulses of Josephson junction arrays. This improvement enabled the digital synthesis of arbitrary waveforms

A Performance Measurement Environment for Cluster Computing

August 1, 2000
Author(s)
M M. Courson, Alan Mink, G J. Marcais, B Traverse
A number of factors promote frequent running of performance measurement codes for the evaluation and tuning of both applications and platforms. NIST is developing a prototype for an automated software measurement toolset to reduce the manual effort in

A Sensitive Denaturing Gradient-Gel Electrophoresis Assay Reveals a High Frequency of Heteroplasmy in Hypervariable Region 1 of the Human mtDNA Control Region

August 1, 2000
Author(s)
L A. Tully, T. J. Parsons, R J. Steighner, M M. Holland, M A. Marino, V L. Prenger
A population study of heteroplasmy in the hypervariable region 1 (HV1) portion of the human Mitochondrial DNA (mtDNA) control region was performed. Blood samples from 253 biologically unrelated individuals from a random population were examined using a

A sounding Rocket Mission to Study the Solar Soft X-Ray and EUV Emission Using Transition-Edge sensor Technology

August 1, 2000
Author(s)
K Wamba, H Walker, Aaron J. Miller, B. Cabrera, D W. Robertson, P F. Boerner, D S. Martinez-Galarce, S F. Powell, Sae Woo Nam, Kent D. Irwin, Steven Deiker, R B. Hoover, T W. Barbee, P F. Baker
We are developing a new sounding rocket payload, the Advanced Technology Solar Spectroscopic Imager (ATSSI) that will use an 8x8 array of transition edge sensors (TES) to obtain true spectroheliograms in a spectral bandpass spanning 10 eV to 3 keV. The TES

A Standard Test Course for Urban Search and Rescue Robots

August 1, 2000
Author(s)
Adam S. Jacoff, Elena R. Messina, John Evans
One approach to measuring the performance of intelligent systems is to develop standardized or reproducible tests. These tests may be in a simulated environment or in a physical test course. The National Institute of Standards and Technology is developing

A Thermodynamic Study of the Conversion of Chorismate to Isochorismate

August 1, 2000
Author(s)
Yadu D. Tewari, A M. Davis, Prasad T. Reddy, Robert N. Goldberg
Microcalorimetry and high performance liquid chromatography were used to conduct a thermodynamic investigation of the biochemical reaction chorismate(aq) = isochorismate(aq). this reaction occurs at the branch point of the chorismate metabolic pathway that

Accurate Transition Rates for the 5p-5s Transitions in Kr I

August 1, 2000
Author(s)
Krzysztof Dzierzega, U Volz, Gillian Nave, Ulf Griesmann
Branching fractions were measured for electric dipole transitions for the 5p upper levels to the 5s levels in neutral Krypton atoms. The measurements were made with a wall-stabilized electric arc for the spectral lines in the visible, and with a hollow

AFM Studies of Confined Dewetting On Gradient Patterned Surfaces

August 1, 2000
Author(s)
Alamgir Karim, A Sehgal, Eric J. Amis
Spinodal dewetting of ultra thin films driven by thermal fluctuations is considered analogous to phase separation accompanied by composition fluctuations. Such dynamic processes are extremely sensitive to perturbation by external fields. In this study
Displaying 47576 - 47600 of 73969
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