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Displaying 43851 - 43875 of 73929

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

Rapid Screening of the Lower Critical Solution Temperature of Injectable Hydrogels for Tissue Engineering Applications

February 1, 2002

Author(s)

Michael Weir, Joseph M. Antonucci, Francis W. Wang

A rapid screening method was developed to examine the effect of a wide array of potentially biodegradable crosslinking monomers on the lower critical solution temperatue (LCST) of N-isopropylacrylamide (NIPAAm) hydrogels. Both the type of crosslinker and

Results of an International Round-Robin for Tensile Creep Rupture of Silicon Nitride

February 1, 2002

Author(s)

William E. Luecke

Fourteen laboratories participated in an ubterkabiratirt study to establish the within- and between-laboratory repeatability of tensile creep rupture of silicon nitride. In air at 1375 C at 200 Mpa the times to failure ranged over a factor of 50, and the

Reverberation-Chamber Research - Then and Now: A review of early work and comparison with current understanding

February 1, 2002

Author(s)

Paolo Corona, John M. Ladbury, Gaetano Latmiral

The main part of this paper is an English translation (from the original Italian) of an early (1976) paper by P. Corona and G. Latmiral. Alongside this translation is an original critical review of that paper. Much of the current thory, models, and

Scaling of Coulomb Born Cross Sections for Electron-Impact Excitation of Singly Charged Ions

February 1, 2002

Author(s)

Yong Sik Kim

A scaling method applied to plane-wave Born cross sections for electron-impact excitation of neutral atoms is modified and applied to Coulomb Born cross sections for excitations of singly charged ions. The modified scaling for singly charged ions is

SCUBA-2: Application of LTD Technology

February 1, 2002

Author(s)

William Duncan, Wayne Holland, Damian Audley, D R. Kelly, Tully Peacock, Peter Hastings, Michael MacIntosh, Kent D. Irwin, Sae Woo Nam, Gene C. Hilton, Steven Deiker, Anthony Walton, Alan Gundlach, William Parkes, Camilla Dunare, Peter Ade, Ian Robson

We outline the need for SCUBA 2, its goals and specifications. We give reasons for the choice of the low temperature detector technology of TES arrays and SQUID multiplexers and describe our pixel and array architecture and progress on the project to date.

Simultaneous measurement of surface and bulk vector magnetization dynamics in thin Ni-Fe films

February 1, 2002

Author(s)

Matthew Pufall, Thomas J. Silva

The dynamics of the surface and 'bulk' magnetization vectors of a Ni-Fe thin film were measured using the time-resolved second harmonic and linear magnetooptical Kerr effects. Films of 50, 250, and 400 nm thickness were measured. The magnetization dynamics

Sol-Gel Materials for Gas Phase Sensing Using Microhotplate Arrays

February 1, 2002

Author(s)

N O. Savage, Richard E. Cavicchi, Michael J. Tarlov, Stephen Semancik, J Greg Gillen

Sol-gel chemistry is used to create suspensions (sols) of small particles of materials such as metal oxides. These suspensions can be dried to a gel or powder or used in the sol form for coatings and thin films. One promising application of sol-gel derived

Spatial Correlation Functions of Fields and Energy Density in a Reverberation Chamber

February 1, 2002

Author(s)

David A. Hill, John M. Ladbury

A plane-wave integral representation is used to derive spatial correlation functions for the complex electric and magnetic field components, and the results agree with previously published results derived by volume averaging of a mode sum. Results are also

Stray Light Characterization for MOBY

February 1, 2002

Author(s)

Bettye C. Johnson, Steven W. Brown, Keith R. Lykke, M Feinholz, M Yarbrough, S Flora, D K. Clark

The Marine Optical Spectrograpli (MOS) system is used as a down-welling irradiance and up-welling in-water radiance profiler in two configurations: as the sensor for the Marine Optical Buoy (MOBY) and as a mobile, sliipboard-deployable sensor. Both systems

Stream Tables

February 1, 2002

Author(s)

Allan Harvey

This article explains steam tables at an introductory technical level. After some historical meterial on the development of steam tables and their international standardization, the current standrds as adopted by the International Association for the

Structure of Escherichia Coli Aminodeoxychorismate Synthase: Architectural Conservation and Diversity in Chorismate-Utilizing Enzymes

February 1, 2002

Author(s)

J F. Parsons, P Y. Jensen, A S. Pachikara, A J. Howard, Edward Eisenstein, Jane E. Ladner

Aminodeoxychorismate synthase is part of a heterodimeric complex that catalyzes the two-step biosynthesis of 4-amino-4-deoxychorismate, a precursor of p-aminobenzoate and folate in microorganisms. In the first step, a glutamine amidotransferase encoded by

Subthermal Linewidths in Photoassociation Spectra of Cold Alkaline-Earth-Metal Atoms

February 1, 2002

Author(s)

M Machholm, Paul S. Julienne, K A. Suominen

Narrow s-wave features with subthermal widths are predicted for the 1II 9 photoassociation spectra of cold alkaline earth atoms. The phenomenon is explained by numerical and analytical calculations. These show that only a small subthermal range of

Supercurrent Dissipation and Strain-Induced Damage in (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10 /Ag Tape

February 1, 2002

Author(s)

R D. Spal, G N. Riley, C J. Christopherson

Supercurrent dissipation and strain-induced damage in Bi-2223/Ag high temperature superconductor composite tape, at 77 K in self-field, are studied by IV curve analysis. Five dissipation models are considered, and differently processed tapes are compared

Survey of FY 2001 Nanotechnology-Related Research at the National Institute of Standards and Technology

February 1, 2002

Author(s)

Chad R. Snyder, J P. Looney, F A. Moris

This report catalogs the efforts of the National Institute of Standards and Technology (NIST) in nanotechnology during FY 2001. The purpose of this report is to provide a snapshot of current efforts in nanotechnology at NIST and in doing so allow one to

TEM Investigation of Nanoindentation Induced Deformation Structures in W/NbN Nanolaminates

February 1, 2002

Author(s)

M Savage, D E. Kramer, A Lin, Timothy J. Foecke, S A. Barnett

Understanding the deformation mechanisms in nanolaminated composites is an important step towards developing constitutive laws that describe their mechanical behavior. Several mechanisms have been proposed, however experimental corroboration is difficult

Temperature Dependence of Fluorescent Probes for Applications to Polymer Materials Processing

February 1, 2002

Author(s)

Anthony J. Bur, M Vangel, S C. Roth

We have examined the temperature dependence of fluorescence spectra from dyes that can be used as molecular probes during polymer processing. The dyes, perylene and benzoxazolyl stilbene, are in a class of dyes called band definition dyes because their

The Influence of Surface Roughness on the Deforming Friction Behavior of Al-Mg Alloys

February 1, 2002

Author(s)

Mark R. Stoudt

The inhomogeneous morphology of the surface asperities generated during metal forming causes strain localization resulting in tearing during metal forming, and increasing friction between mating die surfaces. Much of the data in the literature do not

The NIST Electron Effective-Attenuation-Length Database

February 1, 2002

Author(s)

Cedric J. Powell, Aleksander Jablonski

The NIST Electron Effective-Attenuation-Length Database provides values of electron effective attenuation lengths (EALs) in solid elements and compounds at selected electron energies between 50 eV and 2,000 eV. The database was designed mainly to provide

The Validation of Fourier-Transform Microwave Spectroscopy for Trace-Gas Analysis

February 1, 2002

Author(s)

Pamela M. Chu, R D. Suenram, Angela R. Hight Walker, R S. DaBell, George C. Rhoderick, Gerald T. Fraser

There is strong interest by regulatory agencies and automobile manufacturers, motivated in large part by increasingly stringent emission standards, for measurement tools capable of quantifying various hydrocarbons, oxygenated hydrocarbons, etc., in

Time-Division SQUID Multiplexers

February 1, 2002

Author(s)

Kent D. Irwin, Leila R. Vale, Norman F. Bergren, Steven Deiker, Erich N. Grossman, Gene C. Hilton, John M. Martinis, Sae Woo Nam, Carl D. Reintsema, David A. Rudman, Martin Huber

SQUID multiplexers (MUX) make is possible to build arrays of thousands of low-temperature bolometers and microcalorimeters based on superconducting transition-edge sensors (TES) with a manageable number of readout channels. We discuss the technical

Time-domain Modeling, Characterization and Measurements of Anechoic and Semi-Anechoic Electromagnetic Test Chambers

February 1, 2002

Author(s)

Christopher L. Holloway, Paul McKenna, Roger Dalke, Rod A. Perala, Charles Devor

In this paper we present time-domain techniques for modeling, characterizing, and measuring anechoic and semi-anechoic chambers used for emission and immunity testing of digital devices. The finite-difference time-domain (FDTD) approach is used to model

Topic Detection and Tracking Evaluation Overview

February 1, 2002

Author(s)

Jonathan G. Fiscus, G R. Doddington

The objective of the Topic Detection and Tracking (TDT) program is to develop technologies that search, organize and structure multilingual, news oriented textual materials from a variety of broadcast news media. This research program uses controlled

Towards Near Perfect Crystals With Only Well-Characterized Imperfections

February 1, 2002

Author(s)

H S. Peiser

Throughout the past century NBS/NIST supported a great variety of research studies in crystallography where the aim was the highest attainable accuracy in measurement. While avoiding overlap with other papers in this volume, this article summarizes results

Two-Photon Spectroscopy of the 4S State of Atomic Lithium: Energy Levels, Hyperfine Structure, and Isotope Shifts

February 1, 2002

Author(s)

W DeGraffenreid, Craig J. Sansonetti

In recent years there have been rapid advances in theoretical models and calculational techniques for few-electron systems. Atomic structure calculations for three-electron systems include not only non-relativistic energy but also relativistic and quantum

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