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Displaying 28801 - 28825 of 74219

Characterization of Nanoporous Low-K Thin Films by SANS Contrast Variation

October 16, 2008
Author(s)
R C. Hedden, Hae-Jeong Lee, Barry J. Bauer
Small-angle neutron scattering (SANS) contrast variation is applied to characterization of nanoporous low-dielectric constant (low-k) thin films. Films are exposed to saturated solvent vapor in air, whereby the pores fill with liquid by capillary

Characterization of the Alloy-Solution Interface

October 16, 2008
Author(s)
H J. Mueller
For metals undergoing corrosion, a layer of water molecules becomes charged due to electrons accumulating on the outer metal surface and hydrated positive ions in solution adjacent to the surface. The layer has properties of capacitance (C dl) and

Characterization of UV-Induced Radiation Damage to Si-based Photodiodes

October 16, 2008
Author(s)
Keith R. Lykke, Ping-Shine Shaw, J L. Dehmer, R Gupta
We have made direct measurements of the internal quantum efficiency and the reflectivity of UV-damaged silicon photodiodes in the spectral range of 120 nm to 320 nm. The above qualities, coupled with absolute spectral responsivities, give unique

Charge and Spin Excitations in Double-Layer Manganites

October 16, 2008
Author(s)
D B. Romero, V B. Podobedov, A Weber, J.F. Mitchell, Y Moritomo, H D. Drew
Charge and spin dynamics in La 2-2xSr 1+2xMn 2O 7 (x=0.4,0.5) are probed by magneto-Raman spectroscopy. A competition between charge-order, antiferromagnetic superexchange and ferromagnetic double-exchange correlations characterize a regime of short-range

Charge Nucleation and Wear on Mica Surfaces

October 16, 2008
Author(s)
J Batteas
The area of nanotribology has advanced greatly in the past 17 years with the introduction of scanned probe microscopies for the characterization of surface properties. The ability to probe the details of structure, friction and adhesion on a local atomic

Charge, Spin, and Lattice Excitations in Double-Layer Manganites

October 16, 2008
Author(s)
D B. Romero, H D. Drew, J.F. Mitchell, Y Moritomo
A Raman-scattering investigation of the double-layer manganites, La 2-2rSr 1+2rMn 2O 7 (x= 0.4,0.5), revealed signatures of a ) charge stripe formation and melting, b)small polaron formation, and c) anisotropic quasiparticle dynamics in the ferromagnetic

Chemical Taxonomies and Semantic Web for AIDS Research- an over view

October 16, 2008
Author(s)
Talapady N. Bhat
Chemical structures provide the basis for understanding and rationalizing drug discovery process fro Human diseases. The study of interactions of chemicals with target enzymes such as HIV- protease, an AIDS enzyme, is critical for optimizing drug-discovery

Chopped Radiation Measurement With Large Area Si Photodiodes

October 16, 2008
Author(s)
George P. Eppeldauer
Frequency dependent response characteristics of photocurrent meters using large area, radiometric quality Si photodiodes have been analyzed. The current responsivity, the voltage noise and drift amplicication, and the gain and bandwidth of the photocurrent

Chromatographic Separation of Single Wall Carbon Nanotubes

October 16, 2008
Author(s)
Barry J. Bauer, Vardhan Bajpai, Jeffrey Fagan, Matthew Becker, Erik K. Hobbie
Size exclusion chromatography (SEC) has been used to separate single wall carbon nanotubes (SWNT) dispersed by chemical modification in organic solvents and by DNA in aqueous solution. The chromatographic detection includes size sensitive detectors, multi

Ciao: Developing an Architecture for User Profile Management

October 16, 2008
Author(s)
K Broun
The Office of Information Services is responsible for NIST's research library and publications program. In the course of developing new electronic and print versions of one of those publications, the Technicalendar, we realized we had an opportunity to

Clementite's Elastic Constants

October 16, 2008
Author(s)
Sudook A. Kim, H M. Ledbetter
By extrapolation, we estimated cementite's elastic constants. Altogether, we studied seven Fe-C binary alloys varying from 0 to 17.3 atomic percent carbon. Thus, we measured hypoeutectoid, near eutectoid, and hypereutectoid alloys. For cementite, we report

Climbing the Vibrational Ladder to Probe the OH Stretch of HNO 3 on Silica

October 16, 2008
Author(s)
A C. Pipino, Marcin Michalski
The first and second OH-stretching overtones of HNO3 adsorbed on atomically smooth amorphous SiO2 have been probed by evanescent wave cavity ring-down spectroscopy (EW-CRDS) using a broadband high-finesse total-internal-reflection-ring resonator. In

Coherent Rayleigh Scattering

October 16, 2008
Author(s)
J H. Grinstead, P F. Barker
Nonresonant four-wave mixing in rarefied gases in which the nonlinearity arises from microscopic velocity perturbations induced by electrostriction has been analyzed theoretically and experimentally. The spectral distribution of the signal beam was

Comment on 'Laterally Squeezed Excitonic Wave Function in Quantum Wires'

October 16, 2008
Author(s)
Garnett W. Bryant, Y B. Band, Paul S. Julienne
Recent magnetophotoluminescence data on T-shaped quantum wires is reinterpreted based on a detailed theory of magnetoexcitons in T-shaped quantum wires. We show that the previous analysis greatly overestimates exciton squeezing in T-shaped wires.

Comment on Intrinsic Gap States in Semiconductor Nanocrystals

October 16, 2008
Author(s)
W Jaskolski, R -. Oszwaldowski, Garnett W. Bryant
We comment on the paper Intrinsic Gap States in Semiconductor Nanocrystals. We show that the predicted gap states are nanphysical and should not be used to interpret data.
Displaying 28801 - 28825 of 74219