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Search Publications

NIST Authors in Bold

Displaying 36901 - 36925 of 73697

A chip-scale atomic clock based on 87 Rb with improved frequency stability

February 21, 2005
Author(s)
Svenja A. Knappe, P Schwindt, V Shah, Leo W. Hollberg, John E. Kitching, Li-Anne Liew, John Moreland
We demonstrate a microfabricated atomic clock physics package based on coherent population trapping (CPT) of 87Rb atoms. The package occupies a volume of 12 mm 3 and requires 195 mW of power to operate. Compared to a previous microfabricated clock exciting

Effect of Uniaxial Strain on the Surface Roughness of Pure MG and MG-AZ31 Alloy

February 21, 2005
Author(s)
Mark R. Stoudt, A -. Munitz, Stephen W. Banovic, Richard J. Fields
Pure Mg and Mg AZ31 alloy samples were deformed in uniaxial tension and the resultant surface topographies were characterized with optical microscopy, scanning laser confocal microscopy (SCLM) and scanning electron microsopy (SEM) techniques. Initial

Measurement of detector nonlinearity at 193 nm

February 20, 2005
Author(s)
Holger Laabs, Darryl A. Keenan, Shao Yang, Marla L. Dowell
We have developed a measurement system based on a correlation method to characterize the nonlinearity of a detector's response over a large range of laser pulse energy. The system consists of an excimer-laser source, beam-shaping optics, a beam splitter, a

Frequency modulation of spin-transfer oscillators

February 18, 2005
Author(s)
Matthew Pufall, William Rippard, Shehzaad F. Kaka, Thomas J. Silva, Stephen E. Russek
Spin-polarized dc electric current flowing into a magnetic layer can induce precession of the magnetization at a frequency that depends on current. We show that addition of an ac current to this dc bias current results in a frequency modulated (FM)

Random decoupling schemes for quantum dynamical control and error suppression

February 18, 2005
Author(s)
Lorenza Viola, Emanuel Knill
We introduce a general control-theoretic setting for random dynamical decoupling, applicable to quantum , engineering of both closed-and open-system dynamics. The basic idea is to randomize the operations of the controller, by designing the control

NFIQ Compliance Test

February 14, 2005
Author(s)
Elham Tabassi
In August 2004 NIST published a novel measure of fingerprint image quality, which can be used to estimate fingerprint match performance. The definition and methodology of NIST Fingerprint Image Quality (NFIQ) is documented in [1] and its implementation is

Challenges in Using a Reverberation Chamber for Probe Calibration

February 13, 2005
Author(s)
John M. Ladbury, Dennis Lewis, Galen H. Koepke, Randy Direen
We discuss some of the challenges associated with attempts to calibrate electromagnetic field probes in a reverberation chamber. These include immunity issues, problems related to the transient nature of the fields in a reverberation chamber, and

The Development of a High-Throughput Axisymmetric Adhesion Test

February 13, 2005
Author(s)
Aaron M. Forster, Wenhua Zhang, Christopher Stafford
There has been a growing effort to extend combinatorial and high throughput (C&HT) methods into many aspects of material science, including material property screening and materials discovery. In material science, a prevalent approach to combinatorial

Stability of a Penning trap with a quadrupole rotating electric field

February 11, 2005
Author(s)
T Hasegawa, M J. Jensen, John Bollinger
We present theoretical and experimental studies of the center-of-mass (COM) stability of ions in a Penning trap with a quadrupole rotating electric field. The rotation frequency of an ion cloud in a Penning trap determines the cloud density and shape, and

Chemical Science and Technology Laboratory: Annual Report FY2004

February 9, 2005
Author(s)
W Koch, Eric B. Steel, Ellyn S. Beary
This report summarizes the research and services provided by the Chemical Science and Technology Laboratory of the National Institute of Standards and Technology for Fiscal Year 2004. The report includes: a general overview of the laboratory's activities

Thermodynamic Properties of 2-Methylquinoline and 8-Methylquinoline

February 9, 2005
Author(s)
Robert D. Chirico, William Steele
Measurements leading to the calculation of the standard thermodynamic properties for gaseous 2-methylquinoline (Chemical Abstracts registry number [91-63-4]) and 8 methylquinoline (Chemical Abstracts registry number [611-32-5]) are reported. Experimental

A Hybrid Lagrangian Variational Method for Bose-Einstein Condensates in Optical Lattices

February 7, 2005
Author(s)
M Edwards, L M. DeBeer, M Demenikov, J Galbreath, B Nelson, Charles W. Clark
Solving the Gross--Pitaevskii (GP) equation describing a Bose--Einstein condensate (BEC) immersed in an optical lattice potential can be a numerically demanding task. We present a variational technique for providing fast, accurate solutions of the GP

Toward chip-scale atomic clocks

February 7, 2005
Author(s)
C. T-C. Nguyen, John Kitching
This paper describes work towards the use of integrated microelectromechanical systems (MEMS) technology to shrink atomic clocks from their present-day table-top sizes down to only one cubic-centimeter, while retaining exceptional timing stability on the

End States in One-Dimensional Chains

February 4, 2005
Author(s)
Jason Crain, Daniel T. Pierce
End states-the zero-dimensional analogs of the two-dimensional states that occur at a crystal surface-were observed at the ends of one-dimensional atom chains that were self-assembled by depositing gold on the vicinal Si(553) surface. Scanning tunneling

PVTx Measurements and Crossover Equation of State of Pure n-Hexane and Dilute Aqueous n-Hexane Solutions in the Critical and Supercritical Regions

February 2, 2005
Author(s)
Ilmutdin Abdulagatov, Emil Bazaev, Joe W. Magee, Sergei B. Kiselev, James F. Ely
The PVTx relationship of aqueous n-hexane solutions (0.0201, 0.082 and 0.8500 mole fraction of n-hexane) has been measured in the near-critical and supercritical regions with a constant-volume piezometer. Measurements were made on the critical isotherm of

A Rigorous Attempt to Verify Interstellar Glycine

February 1, 2005
Author(s)
Lewis E. Snyder, Francis J. Lovas, J M. Hollis, Douglas N. Friedel, P R. Jewell, A Remijan, Vadim V. Ilyushin, E A. Alekseev, S K. Dyubko
In 2003, Kuan, Charnley, and co-workers claimed the detection of interstellar glycine (NH2 CH2COOH) based on the detection of 27 lines in 19 different spectral bands in one or more of the sources Sgr B2(N-LMH), Orion KL, and W51 e1/e2. They supported their

Adaptive Grid Refinement for a Model of Two Confined and Interacting Atoms

February 1, 2005
Author(s)
William F. Mitchell, Eite Tiesinga
We have applied adaptive grid refinement to solve a two-dimensional Schroedinger equation in order to study the feasibility of a quantum computer based on extremely-cold neutral alkali-metal atoms. Qubits are implemented as motional states of an atom
Displaying 36901 - 36925 of 73697
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