An official website of the United States government
Here’s how you know
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.
The Phillip Burton Federal Building and U.S. Courthouse located at 450 Golden Gate Avenue in San Francisco was selected as the site for the world's first large...
A S. Bakulin, S M. Durbin, C Liu, J Erdmann, A T. Macrander, Terrence J. Jach
We discuss the possibilities for using Kirkpatrick-Baez (K-B) multilayer elements to directly image the fluorescence distribution from a specimen under x-ray...
Frequency-dependent acoustic center correction values are required to obtain accurate microphone calibrations in the free-field by the reciprocity technique...
M R. Matthews, D S. Hall, D S. Jin, J R. Ensher, C E. Wieman, Eric A. Cornell, F Dalfovo, C Minniti, S Stringari
A two photon transition is used to rapidly convert an arbitrary fraction of 87Rb atoms from a [F=1, m f=-1>condenstate to the [F=2,n f=2>state. Transferring the...
The review considers the role of closed-ring intermediates in chemistry, in general, and focuses on recent experimental and theoretical works that provide...
Ionization energies for several of the lower lying S- and P-states of helium are deduced from a combination of theory and a variety of high precision...
Conic mirror reflectometers are used to measure the diffuse reflectance and total integrated scatter of surfaces. In spite of the long history of using conic...
R Span, Eric Lemmon, R. T. Jacobsen, Wolfgang Wagner
A new formulation describing the thermodynamic properties of nitrogen has been developed. New data sets are now available which have been used to improve the...
Ram D. Sriram, S Gorti, A Gupta, Gerard Kim, A Wong
We report on the development of a knowledge representation model, which is based on the SHARED object model reported in [33,34]. Our current model is...
Y Chen, John S. Suehle, Chien-Chung Shen, J B. Bernstein, C. Messick, P Chaparala
A new technique, the dual voltage versus time curve (V-t) integration technique, is presented as a much faster method to obtain time-dependent dielectric...
Edwin R. Williams, Richard L. Steiner, David B. Newell
Using a moving coil watt balance, electric power measured in terms of the Josephson and quantum Hall effects is compared with mechanical power measured in terms...
Many problems entail the analysis of data that are independent and identically distributed random graphs. Useful inference requires flexible probability models...
The chemical reactions and the compositional characteristics of liquids which lead to the phase formation of the Pb-2223 ((Bi,Pb):Sr:Ca:Cu:O) superconductor...
The generalized Born [GB] approximation is a reasonable electrostatic model that is fast enough for use with extensive conformational sampling. This study...
Reduction potentials of 1- and 2-naphthoxyl, 2-, 3-, and 4-pyridoxyl, and 4-phenylphenoxyl radicals in alkaline aqueous solutions were determined by pulse...
This paper presents a magnetization interpolation method for micromagnetic exchange energy calculations using a variational procedure to relax spins on a...
Robert D. McMichael, Mark D. Stiles, P J. Chen, William F. Egelhoff Jr.
The out-of-plane angular dependence of the ferromagnetic resonance linewidth, [Δ] H, has been measured for thin magnetic films coupled to NiO and for uncoupled...
Thomas H. Gnaupel-Herold, Paul C. Brand, Henry J. Prask
In this work a method is developed that allows the computation of the single- crystal elastic constants for crystals of cubic symmetry from the diffraction...
An atomic-levellmechanical hardness model that is based on screened electrostatics and elastic shear (SEES) is generalized to single-phase substitutional...
Using 40 ns laser pulses, we probe the real-time dynamics of ultra-cold ionizing collisions in metastable xenon. We time-resolve both shielding and enhancement...
C Lugez, Marilyn E. Jacox, R A. King, H F. Schaefer
When a Ne:SF6 mixture is subjected to Penning ionization and/or photoionization by neon atoms in their first excited states, between 16.6 eV and 16.85 eV, and...
R D. Suenram, Francis J. Lovas, Angela R. Hight Walker, D Dixon
The rotational spectrum of bis (difluoromethyl) ether (CF 2HOCF 2H) has been observed and analyzed using both a conventional Stark-modulated microwave...