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Displaying 43601 - 43625 of 73893

Phase Stabilization of Ultrashort Optical Pulses

April 1, 2002
Author(s)
Steven T. Cundiff
New methods have recently been developed to measure the carrier-envelope phase evolution of ultrashort optical pulses. These methods utilize a powerful combination of time-domain and frequency-domain techniques. The resulting ability to stabilize the

Probing Potential Surfaces for Hydrogen Bonding: Near-Infrared Combination Band Spectroscopy of Van Der Waals Stretch (N 4 ) and Geared Bend (N 5 ) Vibrations in (HCl) 2

April 1, 2002
Author(s)
M Farnik, S Davis, M D. Schuder, David Nesbitt
High resolution infrared spectra of the two low frequency intermolecular modes - van der Waals stretch (Ņ 4) and geared bend (Ņ 4) and geared bend (Ņ 5) of (HCI) 2 - have been characterized in HCI-stretch excited states using a slit jet spectrometer. In a

Process Sensitivity of GMAW: Aluminum vs. Steel

April 1, 2002
Author(s)
Timothy P. Quinn
A heat-transfer model of the melting electrode in gas metal are welding (GMAW) was used to compare the relative sensitivity of the process when welding with aluminum electrodes compared to that of steel electrodes. The aluminum model was verified with

Programs of the Manufacturing Engineering Laboratory 2002

April 1, 2002
Author(s)
Lisa J. Fronczek, Bessmarie A. Young
The National Institute of Standards and Technology's Manufacturing Engineering Laboratory (MEL) strengthens the U.S. economy and improves the quality of life by working with the U.S. manufacturing industry to devleop and apply infrastructural technology

QoS Routing Under Adversarial Binary Uncertainty

April 1, 2002
Author(s)
Vladimir V. Marbukh
A cost-based admission control and routing scheme admits an arriving request on the minimum cost route if this cost does not exceed the cost of the request, and rejects the request otherwise. Cost based strategies naturally arise as a result of

Quadrupole Effects in Core and Valance Photoelectron Emission From Crystalline Germanium Measured Via a Spatially Modulated X-Ray Interference Field

April 1, 2002
Author(s)
E J. Nelson, Joseph C. Woicik, P Pianetta, I A. Vartanyants, J W. Cooper
Near an x-ray Bragg reflection, two x-ray beams (incident and reflected) with opposite wavevectors exist within the crystal to create an x-ray standing wave (XSW) interference field. The part of the photoelectron yield depending on quadrupole (and higher

Quantum Effects on Curve Crossing in a Bose-Einstein Condensate

April 1, 2002
Author(s)
V Yurovsky, A Ben-Reuven, Paul S. Julienne
Formation of Atomic Pairs by dissociation of a molecular condensate or by inelastic collisions in an atomic condensate due to time-dependent curve crossing is studied beyond the mean-field approximation. The number of atoms formed by the spontaneous

Reaction Kinetics in Ionic Liquids as Studied by Pulse Radiolysis: Redox Reactions in the Solvents Methyltributylammonium Bis(trifluoroniethyl-sulfonyl)imide and N-Butylpyridinium Tetrafluoroborate

April 1, 2002
Author(s)
D Behar, Pedatsur Neta, C R. Schultheisz
Rate constants for several reduction and oxidation reactions were determined by pulse radiolysis in three ionic liquids and compared with rate constants in other solvents. Radiolysis of the ionic liquids methyltributylammonium bis(trifluoromethylsulfonyl

Refrigerant Flow Through Flexible Short-Tube Orifices

April 1, 2002
Author(s)
William V. Payne, Y C. Kim, Dennis L. O'Neal, Mohsen Farzad
Flexible short-tube orifices were designed to decrease their diameter as the pressure differential across them increases under high outdoor temperatures. A series of tests for an R-22/lubricant mixture (mass fraction of oil 1.2%) were performed with two

Refrigerant Flow Through Flexible Short-Tube Orifices

April 1, 2002
Author(s)
Y Kim, D L. O'Neal, William V. Payne, MD L. Farzad
A series of tests for a R-22/lubricant mixture (1.2 % oil concentration) were performed with two flexible short tube orifices to develop flow data over a range of typical air conditioner operating conditions. One orifice had a modulus of elasticity of 7063

Remineralization Effect of a Low-Concentration Fluoride Rinse in an Intraoral Model

April 1, 2002
Author(s)
Laurence C. Chow, Shozo Takagi, Stanislav Frukhtbeyn, B A. Sieck, Edward E. Parry, N S. Liao, Gary E. Schumacher, Milenko Markovic
A previous study showed that a sodium hexafluorosilicate-calcium chloride-based two-solution fluoride (F) rinse containing 6 mmol/l of F was more effective than a 12 mmol/l F sodium fluoride rinse in depositing F on tooth surfaces and increasing oral F

Resonant Control of Elastic Collisions in an Optically Trapped Fermi Gas of Atoms

April 1, 2002
Author(s)
T Loftus, C A. Regal, J L. Ticknor, J L. Bohn, Deborah S. Jin
We have loaded an ultracold gas of fermionic atoms into a far off resonance optical dipole trap and precisely controlled the spin composition of the trapped gas. We have measured a magnetic-field Fesh-bach resonance between atoms in the two lowest energy

Scattering Length of the Ground-State Mg+Mg Collision

April 1, 2002
Author(s)
Eite Tiesinga, Svetlana A. Kotochigova, Paul S. Julienne
We have constructed the $XA I \Sigma_g^+ $ potential for the collision between two ground state Mg atoms andanalyzed the effect of uncertainties in the shape of the potential on scattering properties at ultra-cold temperatures.This potential reproduces the

Stoichiometry of Slag Hydration With Calcium Hydroxide

April 1, 2002
Author(s)
J M. Richardson, Joseph J. Biernacki, Paul E. Stutzman, Dale P. Bentz
The stoichiometry of the reaction between ground granulated blast furnace slag (GGBFS) having an empirical formula of C 7.d88^ S 7.39 and calcium hydroxide (CH) was investigated. Scanning electron microscopy (SEM) was used to determine the slag consumption

Sub-Doppler Molecular-Iodine Transitions Near the Dissociation Limit (523-498 NM)

April 1, 2002
Author(s)
W Y. Cheng, L Chen, T H. Yoon, John L. Hall, Jun Ye
A widely tunable and high-resolution spectrometer based on a frequency doubled Ti: sapphire laser is used to explore sub-Doppler transitions of iodine molecules in the wavelength range of 523-498 nm. The wavelength-dependence of the hyperfine transition

Summary of Comparison of Realizations of the ITS-90 Over the Range 83.8058 K to 933.473 K: CCT Key Comparison CCT-K3

April 1, 2002
Author(s)
Billy W. Mangum, Gregory F. Strouse, William F. Guthrie, R Pello, M F. Stock, E Renaot, Y Hermier, G Bonnier, P Marcarino, K S. Gam, K H. Kang, Y G. Kim, J V. Nicholas, D. R. White, T D. Dransfield, Y Duan, Y Qu, J Connolly, R L. Rusby, J Gray, G J. Sutton, D I. Head, K D. Hill, A G. Steele, K Nara, Tony J. Tegeler, U Noatsch, D Heyer, B Fellmuth, B Thiele-Krivoj, S Duris, A I. Pokhodun, N P. Moiseeva, A G. Ivanova, P A. de Groot, J F. Dubbeldam
This is a report to the Comite Consultatif de Thermometrie (CCT) on Key Comparison 3, i.e., the comparison of realizations of the ITS-90 over the range 83.8058 K to 933.473 K. The differences in the realizations of the various fixed points in this range of

Synchrotron White-Beam X-Ray Topography of Ribonuclease S Crystals

April 1, 2002
Author(s)
W M. Vetter, David Travis Gallagher, M Dudley
With careful experimental design indexed synchrotron white-beam X-ray topographs of ribonuclease S crystals at ambient temperature could be recorded with a definition and contrast comparable to that of monochromatic beam topographs of other proteins

Techniques for System and Data Recovery

April 1, 2002
Author(s)
William E. Burr, Joan Hash
The key asset in Federal agencies today is the information and data used to implement, sustain and maintain critical government programs and operations. Current efforts in ensuring that the United States can recover and restore activities which have great

The Bogoliubov Approach to Number Squeezing of Atoms in an Optical Lattice

April 1, 2002
Author(s)
K Burnett, M Edwards, Charles W. Clark, M Shotter
We describe an approach for finding the number squeezing for arrays of atoms in an optical lattice. It is based on a straightforward extension of the Bogoliubov method. We discuss the conditions for optimizing squeezing and how to predict what will be
Displaying 43601 - 43625 of 73893
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