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NIST Authors in Bold

Displaying 29426 - 29450 of 73697

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.

Comment on Melkman's Convex Hull Algorithm

October 16, 2008
Author(s)
David S. Bright
The input to the elegant and simple algorithm by Melkman must not be three collinear points. Otherwise, the algorithm correctly removes collinear points.

Comments on the Discrete Variable Representation

October 16, 2008
Author(s)
B I. Schneider, N Nygaard
We discuss the application of the Discrete Variable Representation to Schr dinger problems which involve singular Hamiltonians. Unlike recent authors who invoke transformations to rid the eigenvalue equation of singularities at the cost of added complexity

Comments on the Entropy of NonEquilibrium Steady States

October 16, 2008
Author(s)
D J. Evans, R Lamberto
We discuss the entropy of nonequilibrium steady states. We show that the so-called spontaneous entropy production of reversible deterministic nonequilibrium systems results from the collapse of such systems towards an attractor which is of lower dimension
Displaying 29426 - 29450 of 73697
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