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Displaying 42501 - 42525 of 73829

Refrigeration Methods for Superconductors

December 1, 2002
Author(s)
Ray Radebaugh
This chapter reviews various methods commonly used for achieving the cryogenic temperatures required of superconducting materials. The problems associated with cryogenic refrigerators (cryocoolers), such as poor reliability, low efficiency, electromagnetic

Report of the 87th National Conference on Weights and Measures

December 1, 2002
Author(s)
H V. Oppermann, T L. Grimes
The 87th Annual Meeting of the National Conference on Weights & Measures (NCWM) was held July 14 through July 18, 2002, at the Omni Netherland Holtel, Cincinnati, OH. The theme of the meeting was A Progressive Partnership for the Future--You and NCWM

Review of Residential Sprinkler Systems: Research and Standards

December 1, 2002
Author(s)
Daniel M. Madrzykowski, R P. Fleming
Automatic sprinkler systems have been successfully used to protect industrial and commercial buildings and their occupants for more than 100 years. Historically, the place which has offered the least amount of fire protection to occupants, was and still is

Rotational Spectrum of Jet-Cooled HfO 2 and HfO

December 1, 2002
Author(s)
A Lesarri, R D. Suenram, D J. Brugh
The rotational spectrum of jet-cooled hafnium dioxide obtained by laser ablation of a solid ceramic rod has been investigated by Fourier transform microwave spectroscopy in the frequency range 8 Hz to 28 GHz. Rotational transitions from the ground and

Single Photon Source with Individualized Single Photon Certifications

December 1, 2002
Author(s)
Alan L. Migdall, D A. Branning, Stefania Castelletto, M J. Ware
As currently implemented, single photon sources cannot be made to produce single photons with high probability, while simultaneously suppressing the probability of yielding two or more photons.Because of this, single photon sources cannot really produce

Solvophobically Driven Self-Assembly of Chiral Supramolecular Dendrimers

December 1, 2002
Author(s)
Virgil Percec, A E. Dulcey, Y Miura, U Edlund, V S. Balagurusamy, Steven Hudson, H Duan, Paul A. Heiney
The self assembly in dilute solution of chiral supramolecular dendrimers is investigated by circular dichroism (CD) spectroscopy. These results are compared with analysis of the bulk state by CD spectroscopy x-ray diffraction electron diffraction and

Spectral Responsivity Determination of a Transfer-Standard Pyroelectric Radiometer

December 1, 2002
Author(s)
George P. Eppeldauer, J Racz, Leonard M. Hanssen
A NIST-Developed pryoelectric radiometer was characterized and calibrated to extend the NIST high accuracy spectral responsively scale from the visible range to the ultraviolet (UV) and infrared (IR). The transmission of the gold-black coated LiNbO 3

Superconformal Electrodeposition Using Derivitized Substrates

December 1, 2002
Author(s)
Thomas P. Moffat, Daniel Wheeler, C Witt, Daniel Josell
This paper demonstrates superconformal electrodeposition of copper in trenches using a two step process. The substrate is first derivitized with a submonolayer coverage of catalyst and then transferred for electroplating in a cupric sulfate electrolyte

Thermodynamic Quantities for the Ionization Reactions of Buffers in Water

December 1, 2002
Author(s)
Robert N. Goldberg, N Kishore, R M. Lennen
This table contains selected values for the pK, standard molar enthalpy of reaction {Δ} rH , and standard molar heat-capacity change {Δ} rC p for the ionization reactions of 64 buffers many of which are relevant to biochemistry and to biology. The values

Universal Scaling of Ballistic Magnetoresistance in Magnetic Nanocontacts

December 1, 2002
Author(s)
S Chung, M Munoz, N Garcia, William F. Egelhoff Jr., Romel Gomez
This paper shows that ballistic magnetoresistance has a universal behavior versus scaled conductance in atomic or nanometer size contacts. New results are presented for half-metallic ferromagnets forming contacts of CrO 2-CrO 2 and CrO 2-Ni that show as

X-Ray Spectroscopy of Trapped Ions With a Microcalorimeter on the NIST Electron Beam Ion Trap

December 1, 2002
Author(s)
E Takacs, John D. Gillaspy, L P. Ratliff, K Makonyi, J M. Laming, E Silver, H. Schnopper, M Barbera, J. Beeman, E. E. Haller, N. Madden
The electron beam ion trap (EBIT) was invented about 15 years ago. Judging from the wide range of experiments performed on the machine since its inception, EBITs have become one of the most successful devices to Produce, trap and study the structure and

Binary Diffusion Coefficients for Combustion Modeling

November 30, 2002
Author(s)
William S. McGivern, Jeffrey A. Manion
Recent studies have demonstrated that combustion models can be as sensitive to the binary diffusion coefficients of the fuel species as to the kinetics of major chemical reactions. We have constructed a reversed-flow chromatographic apparatus for the

Preliminary Concept Trial of the Semi-Automated Paint Containment System

November 30, 2002
Author(s)
Richard J. Norcross
The Carderock Division of the Naval Surface Warfare Center (NSWC-CD) is developing the Automated Paint Application, Containment, and Treatment System (APACTS) to apply anti-corrosive and anti-fouling paints in an environmentally sound manner. NSWCCD
Displaying 42501 - 42525 of 73829
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