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Displaying 29976 - 30000 of 73818

Non-quantization of Current in an Annular Bose-Einstein Condensate

October 16, 2008
Author(s)
D L. Feder, L A. Collins, Charles W. Clark
The circulating states of a Bose-Einstein condensate confined in an annulus are investigated both analytically and numerically. It is demonstrated that while single-valuedness of the condensate wavefunction ensures the quantization of circulation in this

Nonlinear Coupling of Surface and Quasitransverse Bulk Modes in Cubic Crystals

October 16, 2008
Author(s)
R E. Kumon, M F. Hamilton
In some propagation directions in crystals, the speed of the surfaceacoustic wave mode may approach that of the lowest speed quasitransverse bulk mode. Under these circumstances, it is possible for energy to be transferred from the surface to the bulk mode

Nonlinear SAW Propagation in Thin-Film Systems With Residual Stress

October 16, 2008
Author(s)
R E. Kumon
The propagation of small- and finite-amplitude surface acoustic waves (SAWS) in stressed thin-film systems is modeled. Results are presented for an initially monofrequency, plane wave traveling in the direction of systems composed of either Ge (loading) or

Normalized Relative Uncertainties and Applications to Confidence Intervals

October 16, 2008
Author(s)
Daniel E. Kelleher
The relative standard uncertainty (computed relative standard deviation of the mean) is shown to be intrinsically normalized when the averaged values all have the same sign. We exploit this fact to derive improved confidence intervals by pooling comparable

North American Quality System Registration Organizations (NAQSRO)

October 16, 2008
Author(s)
M E. Squires
The Semi-Annual Listing of North American Quality System Registration Organizations (NAQSRO)provides information on organizations that have informed NIST about their quality system registration according to the ASQ Q9000 series, QS-9000, ISO 14000 (EMS) or

Obituary: Jules Zeiser Klose

October 16, 2008
Author(s)
William R. Ott
Jules Zeiser Klose, 77, an atomic physicist at the National Bureau of Standards (NBS) and the National Institute of Standards and Technology (NIST), died Sunday, August 8, 2004 at the Annapolitan Care Center in Annapolis MD following a lengthy illness and

Observation of Persistent Flow of a Bose-Einstein Condensate in a Toroidal Trap

October 16, 2008
Author(s)
Changhyun Ryu, Mikkel Andersen, Pierre Clade, Vasant Natarajan, Kristian Helmerson, William D. Phillips
We have observed the persistent flow of Bose-condensed atoms in a toroidal trap. The flow persists without decay for up to 10 s, limited only by experimental factors such as drift and trap lifetime. The quantized rotation was initiated by transferring one

Observation of Polarization-Locked Vector Solitons in Optical Fiber

October 16, 2008
Author(s)
S T. Cundiff, B C. Collins, N N. Akhmediev, J M. Soto-Crespo, K Bergman, W H. Knox
We observe the formation of polarization-locked vector solitons in a modelocked fiber laser. Temporal vector solitons contain components along both principal axes of the birefringent laser cavity. The relative phase of the two components is locked to a

Observation of Soliton Explosions

October 16, 2008
Author(s)
S T. Cundiff, J M. Soto-Crespo, N N. Akhmediev
We show, experimentally and numerically, that Ti: sapphire mode-locked lasers can operate in a regime in which they produce exploding solitons. This happens when the laser operates near a critical point. Explosions occur intermittently. They happen

OH stretch overtone spectroscopy and transition dipole slignment of HOD

October 16, 2008
Author(s)
David Nesbitt, J R. Fair, O Votava
Photoscoustic spectroscopy in room-temperature H 2O/HOD/D 2O cells has been used to probe the 3v OH and 4v OH overtone bands in HOD via excitation with a single mode (160 MHz) injection-seeded optical parametric oscillator (OPO) and pulsed dye laser

On the Detection of Rare, and Moderately Rare Nuclear Events

October 16, 2008
Author(s)
Lloyd A. Currie
Some of the more important developments in science and practical demands in commerce have been linked to attempts to detect rare events and rare contaminants, ranging from the early counting of solar neutrinos to the occurrence of dodder seeds in clover

On the Existence and Stability of Quadrijunctions

October 16, 2008
Author(s)
John W. Cahn, E S. Vanleck
The existence and stability of various microstructural features for two-phase materials with anisotropic energies is discussed. In particular, the existence of quadri and tri-junctions for energies with different symmetry properties is examined. An Ising

On-Line Process Control

October 16, 2008
Author(s)
Raghu N. Kacker, Nien-Fan Zhang
The natural state of manufacturing and measurement processes is usually nonstationary. The methods of statistical process control (SPC) are therefore inappropriate for on-line control. This paper provides a simple and generic protocol for on-line control

One Dimensional Modeling and Learning

October 16, 2008
Author(s)
J E. Devaney
This paper introduces four new algorithms, the M-algorithm, the L-algorithm, the S-algorithm and the T-algorithm, which enable recognition of distributional functions without doing a fit of the data to the distribution. These algorithms workbest for large

Opportunities for Development of Reference Materials for Beryllium

October 16, 2008
Author(s)
Robert Watters, Aleksander B. Stefaniak, Mark D. Hoover
Reference materials provide the foundation for assessment of analytical chemistry methods, accurate quantification of occupational and environmental exposures, and conduct of in vitro and in vivo toxicology studies for health effects research. Currently

Optical Frequency Combs: From Frequency Metrology to Optical Phase Control

October 16, 2008
Author(s)
Jun Ye, H Schnatz, Leo W. Hollberg
A remarkable synergy between traditionally CW laser-based precision optical frequency metrology and mode-locked ultrafast lasers has led to precision control of the frequency spectrum produced by mode-locked lasers. Such a phase - controlled mode-locked

Optical Frequency Standards and Their Measurement

October 16, 2008
Author(s)
John L. Hall, Jun Ye
The last four years have seen a revolution in the art and practice of optical frequency measurement. Indeed the gearbox represented by the spectrally-broadened fs laser's comb has sufficiently low noise that we in the optics community have abruptly found

Optical frequency standards: Progress and applications

October 16, 2008
Author(s)
John L. Hall, Jun Ye, L -. Ma, K R. Vogel, Tim P. Dinneen
A number of individual small advances, taken together, bring us to the beginning of a new domain of optical frequency stability, reproducibility, and measurements. Particular advances include the refinment of Noise-Immune Cavity-Enhanced Optical Heterodyne
Displaying 29976 - 30000 of 73818
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