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Displaying 51951 - 51975 of 73893

Dynamical Response of a Bose-Einstein Condensate to a Discontinuous Change in Internal State

July 1, 1998
Author(s)
M R. Matthews, D S. Hall, D S. Jin, J R. Ensher, C E. Wieman, Eric A. Cornell, F Dalfovo, C Minniti, S Stringari
A two photon transition is used to rapidly convert an arbitrary fraction of 87Rb atoms from a [F=1, m f=-1>condenstate to the [F=2,n f=2>state. Transferring the entire population imposes a discontinuous change on the condensate's mean-field repulsion

Experimental Demonstration of Some Aspects of LISA Interferometry

July 1, 1998
Author(s)
R T. Giaime, R T. Stebbins, P L. Bender, J E. Faller, J L. Hall
Plans are described to experimentally demonstrate at JILA a possible phase measurement technique for use in LISA interferometry. This demonstration will include use of a compact system for fringe generation and photodetection with realistic beam powers in

Experimental Noise Sources in the NIST Watt Balance

July 1, 1998
Author(s)
Richard L. Steiner, David B. Newell, Edwin R. Williams
The present NIST Watt Balance has a relative combined standard uncertainty of about 145 nW/W. The final results of this phase of the experiment are presented. Improvements in the Type B (nonstatistical) uncertainty contributions, along with several

Extension of Voltage Range for Power and Energy Calibrations

July 1, 1998
Author(s)
O. Petersons, Thomas L. Nelson, Nile M. Oldham, Gerald FitzPatrick
A special purpose ac voltage divider system having voltage ratios of 600 V, 480 V, 360 V, and 240 V to 120 V has been developed to extend the voltage range of primary electric power calibrations from 120 volts to 600 volts at power frequencies of 50 and 60

Fabrication of High-Value Standard Resistors

July 1, 1998
Author(s)
Ronald F. Dziuba, Dean G. Jarrett, L. L. Scott, Andrew J. Secula
The National Institute of Standards and Technology (NIST) has fabricated stable, transportable 10 MΩ} and 1 GΩ} standard resistors for use in an international comparison of high resistances. This fabrication process is being applied to the construction of

Fire Fighting Properties (NISTIR 6191)

July 1, 1998
Author(s)
D W. Stroup, Daniel M. Madrzykowski
Water uses several different mechanisms to suppress and extinguish fires: fuel cooling, flame cooling, oxygen displacement and reduction of radiation feedback to the fuel. Laboratory experiments were conducted to determine which of these mechanisms play

Fourth International Conference on Chemical Kinetics

July 1, 1998
Author(s)
Robert E. Huie, Jeffrey W. Hudgens
The Fourth International Conference on Chemical Kinetics was held July 14-19, 1997, at the National Institute of Standards and Technology in Gaithersburg, MD. The conference was attended by 200 scientists from 21 countries. Topics discussed included small

Glassy Alloys as Potential Bearing Surfaces for Orthopaedic Implants

July 1, 1998
Author(s)
John A. Tesk, C E. Johnson
Glassy (amorphous) metals have some unique properties that may renderthem attractive candidates for the coating of metal-implant bearing surfaces. Metastable glasses of metal alloys, with uniform compositions and homogeous structures that are not

High Efficiency, Dual Collection Mode Near-Field Scanning Optical Microscope

July 1, 1998
Author(s)
Stephan J. Stranick, Lee J. Richter, Richard R. Cavanagh
We have developed a near-field scanning optical microscope that provides simultaneous transmission and reflection mode measurements while concurrently recording a topograph of the sample surface. In this microscope design, an ellipsoidal cavity is used to

Hydration for a Series of Hydrocarbons

July 1, 1998
Author(s)
Raymond D. Mountain, D Thirumalai
The hydrophobic hydration in a series of hydrocarbons is probed using molecular dynamics simulations. The solutes considered range from methane to octane. Examination of the shapes of the hydration shell suggests that there is not a stable clatharate-like

Improvements in 10 Kilohm Resistance Measurements at NIST

July 1, 1998
Author(s)
L. L. Scott
The 10 kilohm measurement system at the National Institute of Standards and Technology has been improved. The guarded resistance bridge is based on the Warshawsky bridge model and is self-balancing through the use of a precision feedback system. A unique

International Comparison of Noise-Temperature Measurements at 2, 4, and 12 GHz

July 1, 1998
Author(s)
James P. Randa, J. Achkar, F. I. Buchholz, T. Colard, D. Schubert, M. Sinclair, John Rice, G. S. Williams
We report results of a recent international comparison of thermal noise-power measurements, performed under the auspices of CIPM/CCE. The noise temperatures of two solid-state sources with GPC-7 connectors were measured at 2, 4, and 12 GHz. All results
Displaying 51951 - 51975 of 73893
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