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Displaying 43726 - 43750 of 73815

International Comparison of Volume Measurement Standards at 50 L at CENAM (Mexico), PTB (Germany), Measurement Canada and NIST (USA)

February 1, 2002
Author(s)
J M. Maldonado, R Arias, H -. Oelze, Vern E. Bean, J F. Houser, C Lachance, Claude Jacques
ntro Nacional de Metrologia (CENAM), Physikalisch-Technische Bundesanstalt (PTB), Measurement Canada (MC), and the National Institute of Standards and Technology (NIST) maintain the national primary standard facilities for the measurement of volume in

Magnetic-Field Imaging of Weakly Bound Levels of the Ground-State Na 2 Dimer

February 1, 2002
Author(s)
T Laue, Eite Tiesinga, C Samuelis, H Knockel, E Tiemann
We measured in a molecular beam experiment the magnetic field dependence of the last bound levels of the X 1Σg + and a 3Σ +u potentials close to the 3s+3s asymptote of Na 2. The field behavior of these levels in an external magnetic field differs for even

Mass Absorption Coefficient of Tungsten for 1600-2100 eV

February 1, 2002
Author(s)
Zachary H. Levine, S Grantham, I McNulty
The transmission of soft x-rays with photon energies from 1606 eV to 2106 eV was measured for tungsten using thin film samples and a synchrotron source. This region includes the M IV and M V edges. The two tungsten films had thicknesses of 107.7 10 nm and

Measuring Droplet Arrival Times Using Phase Doppler Interferometry

February 1, 2002
Author(s)
J F. Widmann, Cary Presser
The difficulty of accurately measuring droplet arrival time statistics is demonstrated using phase Doppler interferometry (PDI) measurements obtained in water sprays produced by pressure-swirl atomizers. It is shown that Doppler burst splitting, in which

MEMS Device Platforms as Research Tools for Developing Improved Sensing Films

February 1, 2002
Author(s)
C J. Taylor, Richard E. Cavicchi, Stephen Semancik
Gas sensing characteristics of metal oxide films are dependent on the preparation method used in their fabrication. To optimize sensing film performance, one must understand how processing parameters influence composition andmicrostructure, and then

Model Checkers in Software Testing

February 1, 2002
Author(s)
Paul E. Black, P E. Ammann, W Ding
The primary focus of formal methods is static analysis of specifications and code, but there is also a long tradition of exploiting formal methods for testing. This paper continues this model by exploring the role of model checkers in software testing

Molecular Basis of Lubrication

February 1, 2002
Author(s)
Stephen M. Hsu
Lubrication is an art that has been practiced for thousands of years from the early days of our human civilization. The study of lubricatin as a science began in the 17th century with the development of bearings and axles. In the early 20th century, the

NIST Property Data Summaries Titanium Diboride (TiB 2 )

February 1, 2002
Author(s)
R G. Munro
Nearly fully dense polycrystalline TiB 2 can be produced by a variety of processing methods, including sintering, hot pressing, hot isostatic pressing, microwave sintering, and dynamic compaction. The relatively strong covalent bonding of the constituents

NIST Standard Reference Materials Catalog 2002

February 1, 2002
Author(s)
J W. Thomas
This catalog provides technical and general ordering information for the Standard Reference Materials [SRMs] and Reference Materials [RMs] currently available from the NIST SRM Program. The materials are arranged according to technical category and

Observation of Anomalous Spin-State Segregation in a Trapped Ultracold Vapor

February 1, 2002
Author(s)
H J. Lewandowski, D M. Harber, D Whitaker, Eric A. Cornell
We observe counter-intuitive spin segregation in an inhomogeneous sample of ultra-cold, non-condensed, magnetically trapped Rubidium atomswith effectively two internal spin states. We use spatially selective microwave spectroscopy to verify a simple model

On Determining the Maximum Emissions From Electrically Large Sources

February 1, 2002
Author(s)
Perry F. Wilson, David A. Hill, Christopher L. Holloway
This paper examines the use of measurements of the total radiated power from an arbitrary source, combined with theory-based directivity or quality factor estimates, to accurately predict the maximum electric field radiated by the source either at a line

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
Displaying 43726 - 43750 of 73815
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