Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Journals

Polydispersity During the Formation and Growth of the Stober Silica Particles from Small-Angle X-Ray Scattering Measurements

September 1, 2000

Author(s)

H Boukari, Gabrielle G. Long, M T. Harris

The early stages of formation of Stober silica particles have been investigated in situ during the hydrolysis and condensation of tetraethylorthosilicate under...

Model for Cyclic Fatigue of Quasi-Plastic Ceramics in Contact with Spheres

September 1, 2000

Author(s)

K -. Lee, Yeon-Gil G. Jung, I M. Peterson, Brian R. Lawn, D H. Kim, S K. Lee

A model of contact damage accumulation from cyclic loading with spheres and ensuing strength degradation in relatively tough, heterogeneous ceramics is...

Elastic Stiffnesses of an Nb-Ti/Cu-Composite Superconductive Wire

September 1, 2000

Author(s)

Sudook A. Kim, H M. Ledbetter, H Ogi

Elastic-stiffness coefficients were determined on a 1.4-mm-diameter wire consisting of superconducting Nb-Ti fibers in a copper matrix, with a polyvinyl-resin...

Nonlinear Ultrasonic Assessment of Precipitation Hardening in ASTM A710 Steel

September 1, 2000

Author(s)

Donna C. Hurley, Davor Balzar, P T. Purtscher

We investigated several specimens of ASTM A710 steel containing copper-rich precipitates with variations in the final aging treatment. X-ray diffraction line...

Fast Quantum Gates for Neutral Atoms

September 1, 2000

Author(s)

D Jaksch, J I. Cirac, W.H. Zoller, S L. Rolston, R Cote, M D. Lukin

We propose several schemes for implementing a fast two-qubit quantum gate for neutral atoms with the gate operation time much faster than the time scales...

Imaging the Phase of an Evolving Bose-Einstein Condensate Wave Function

September 1, 2000

Author(s)

J E. Simsarian, J Denschlag, M Edwards, Charles W. Clark, Lu Deng, Edward W. Hagley, Kristian Helmerson, S L. Rolston, William D. Phillips

We demonstrate a spatially resolved autocorrelation measurement with a Bose-Einstein condensate (BEC) and measure the evolution of the spatial profile of its...

Radiometric Calibration History of Visible and Near-Infrared Portable Radiometers

September 1, 2000

Author(s)

Bettye C. Johnson, Steven W. Brown, Howard W. Yoon

The National Institute of Standards and Technology (NIST), with the support of the National Aeronautics and Space Administration (NASA), has built several...

Investigation of the Collision-Induced Absorbtion by O₂ Near 6.4 Micro ńin Pure O₂ and O₂/N₂ Mixtures

September 1, 2000

Author(s)

B Mate, C Lugez, A M. Solodov, Gerald T. Fraser, Walter J. Lafferty

The collision-induced fundamental vibrational band of molecular oxygen has been measured between 1300 and 2000 cm -1 using a Fourier-transform infrared...

Collision Properties of Ultracold ¹³³Cs Atoms

September 1, 2000

Author(s)

P J. Leo, Carl J. Williams, Paul S. Julienne

We present a theoretical analysis of numerous magnetically tunable Feshbach resonances measured by Vladan et al. at fields of up to 25 m T. This analysis...

A Comparison of the Absolute Detector-Based Spectral Radiance Assignment with the Current NIST-Assigned Spectral Radiance of Tungsten Strip Lamps

September 1, 2000

Author(s)

Howard W. Yoon, Charles E. Gibson

Using a high-temperature blackbody (HTBB) and filter radiometers calibrated for absolute spectral power response, the spectral output of the blackbody, whose...

An Improved Greenspan Acoustic Viscometer

September 1, 2000

Author(s)

J Wilhelm, Keith A. Gillis, J B. Mehl, Michael R. Moldover

We improved the Greenspan acoustic viscometer (double Helmholtz resonator) to measure the viscosity of gases at temperatures from 250 K to 400 K and at...

Initial Etching of GaAs (001) During H₂ Plasma Cleaning

September 1, 2000

Author(s)

Steven W. Robey, K Sinniah

The initial etching of GaAs(001) during remote H 2 plasma etching for oxide removal was examined using Atomic Force Microscopy (AFM), coupled with in situ...

Thermodynamic Properties of the NaCl + H₂O System. 4. Heat Capacities of H₂O and NaCl(aq) in Cold-Stable and Supercooled States

September 1, 2000

Author(s)

Donald G. Archer, R W. Carter

The heat capacities of water and NaCl(aq) from 0.05 to 6 mol.kg -1 were measured from 285 K to a lower temperature of 202 K 2O system was generated on the bases...

Semiconductor Characterization and Analytical Technology

September 1, 2000

Author(s)

Thomas J. Shaffner

The utility of semiconductor characterization techniques continues to be measured by industry requirements for smaller device geometry, atomically smooth...

Ground Wave of an Idealized Lightning Return Stroke

September 1, 2000

Author(s)

J. R. Wait, David A. Hill

We model a lightning return stroke by a vertical traveling wave of current with a complex propagation constant. The Sommerfeld-integral analysis is similar to...

Real-Time Control System Software for Intelligent System Development: Experiments and an Educational Program

September 1, 2000

Author(s)

V Gazi, M L. Moore, K M. Passino, William P. Shackleford, Frederick M. Proctor, James S. Albus

The National Institute of Standards and Technology (NIST) has been developing the Real-Time Control Systems (RCS) software for more than two decades and using...

Effects of Deposition Process Parameters on Exchange Coupling of A-Fe₂O₃/NiFe Bi-Layers and GMR in A-Fe₂O₃/NiFe/Cu/NiFe Spin Valves

September 1, 2000

Author(s)

S Bae, William F. Egelhoff Jr., P J. Chen, J Judy

The anti-ferromagnetic material used for the exchange biasing layer in multilayer GMR spin valve structure requires a high blocking temperature, high corrosion...

Structural and Microscopic Analyses of α-Fe₂O₃/Co(NiFe)/Cu/Co(NiFe) Bottom GMR Spin Valves

September 1, 2000

Author(s)

S Bae, William F. Egelhoff Jr., P J. Chen, J H. Judy

In this work, the effects of crystal structure of variation}-Fe 2O 3, the surface roughness, and interdiffusion of Cu on the GMR properties of variation}-Fe 2O...

The Effect of Oscillatory Shear Flow on Step Bunching

September 1, 2000

Author(s)

B T. Murray, Sam R. Coriell, A A. Chernov, Geoffrey B. McFadden

During crystal growth, an imposed shear flow at the crystal-fluid interface can impact the conditions for the onset of morphological instability. In previous...

Dental Resin Composites Containing Ceramic Whiskers and Precured Glass Ionomer Particles

September 1, 2000

Author(s)

H H. Xu, F Eichmiller, Joseph M. Antonucci, Gary E. Schumacher, L K. Ives

Objectives: Glass ionomer, resin-modified glass ionomer, and compomer materials are susceptible to brittle fracture and are inadequate for use in large stress...

Doppler-Free Two-Photon Spectroscopy in the VUV: The Helium 1¹S - 2¹S Transition

September 1, 2000

Author(s)

S D. Bergeson, K G. Baldwin, Thomas B. Lucatorto, T J. McIlrath, C H. Cheng, E E. Eyler

We describe techniques for laser spectroscopy in the vacuum ultraviolet (VUV) spectral region that combine high spectral resolution with high absolute accuracy...

Waveguide Atom Beam Splitter for Laser-Cooled Neutral Atoms

September 1, 2000

Author(s)

D Muller, Eric A. Cornell, M Prevedelli, P Schwindt, A A. Zozulya, D Z. Anderson

A laser-cooled neutral-atom beam from a low-velocity intense source is split into two beams while it is guided by a magnetic-field potential. We generate our...

Laboratory Astrophysics Survey of Key X-Ray Diagnostic Lines Using a Microcalorimeter on an Electron Beam Ion Trap

September 1, 2000

Author(s)

E Silver, H. Schnopper, Simon R. Bandler, N Brickhouse, S Murray, M Barbera, E Takacs, John D. Gillaspy, James V. Porto, I Kink, J M. Laming, N. Madden, D Landis, J. Beeman, E. E. Haller

Cosmic plasma conditions created in an Electron Beam Ion Trap (EBIT) make it possible to simulate the dependencies of Key diagnostic x-ray lines on density...

Ultracold ⁸⁷Rb Ground-State Hyperfine-Changing Collisions in the Presence and Absence of Laser Light

September 1, 2000

Author(s)

S D. Gensemer, P L. Gould, P J. Leo, Eite Tiesinga, Carl J. Williams

We have measured the rate of hyperfine-changing collisions between ground-state 87Rb atoms in a magneto-optical trap. Using a population switching technique, we...

The Direct Production of CO(v=1-9) in the Reaction of O (P-3) With the Ethyl Radical

September 1, 2000

Author(s)

J P. Reid, T P. Marcy, S Kuehn, S R. Leone

A new product channel that yields vibrationally excited CO(Ņ=1-9) in the reaction of the ethyl radical with O( 3P) is experimentally observed by time-resolved...

Approximate Selection Rules for | K | = 1-0 and 1-1 Tunneling-Rotation Transitions in the Methanol Dimer

September 1, 2000

Author(s)

N Ohashi, Jon T. Hougen

Approximate K = 0 and |K| = 1 tunneling-rotation eigenfunctions for the four A, four E, and one G symmetry species present in the methanol dimer, derived from...

Quantum State-Resolved Scattering of F + CH₄ -> HF(v,J) + CH₃; Nascent HF(v,J) Product State Distributions

September 1, 2000

Author(s)

W W. Harper, S A. Nizkorodov, David Nesbitt

State-to-state reactive scattering of F+CH 4->HF(Ņ,J)+CH 3 is studied usihng crossed supersonic jets and high-resolution (δŅnearly equal to}0.0001 cm -1) IR...

An Ab Initio Study of the Kinetics of the Reactions of Halomethanes With the Hydroxyl Radical. 2. A Comparison Between Theoretical and Experimental Values of the Kinetic Parameters for 12 Partially Halogenated Methanes

September 1, 2000

Author(s)

F Louis, Carlos A. Gonzalez, Robert E. Huie, Michael J. Kurylo III

Ab initio calculations have been performed for the H-atom abstraction reactions from a series of halogenated methanes by the hydroxyl radical. Geometry...

Critical Compressibility Factors for Chain Molecules

September 1, 2000

Author(s)

L L. Lue, Daniel G. Friend, J. R. Elliott

For many equations of state for fluids composed of chain-like molecules, the compressibility factor is related to the chain number concentration only through...

Design of a Flexible, Integrated Testing System for STEP and OMG Standards

September 1, 2000

Author(s)

KC Morris, David Flater

New software standards supporting integration of manufacturing and engineering systems are emerging at a rapid pace. These standards are based on common method...

Was this page helpful?