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Search Publications

NIST Authors in Bold

Displaying 24876 - 24900 of 73960

Imaging of nanoscale charge transport in bulk heterojunction solar cells

June 17, 2011
Author(s)
Behrang H. Hamadani, Nadine E. Gergel-Hackett, Paul M. Haney, Nikolai B. Zhitenev
We have studied the local charge transport properties of organic bulk heterojunction solar cells based on the blends of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) with a photoconductive atomic force microscope (PCAFM). We

Specification for Asset Identification 1.1

June 17, 2011
Author(s)
David A. Waltermire, John Wunder, Adam Halbardier
Asset identification plays an important role in an organization‟s ability to quickly correlate different sets of information about assets. This specification provides the necessary constructs to uniquely identify assets based on known identifiers and/or

Tool Temperatures in Orthogonal Cutting of Alloyed Titanium

June 17, 2011
Author(s)
Robert W. Ivester
This paper presents infrared-based measurements and analysis of cutting tool temperatures for orthogonal machining of alloyed titanium. High-speed infrared video provided the basis for measurement of cutting tool temperature distribution as reported here

A general approach to low noise readout of terahertz imaging arrays

June 16, 2011
Author(s)
Erich N. Grossman, Jonathan D. Chisum, Zoya Popovic
This article describes the theory and design of an ultra-low noise electronic readout circuit for use with room temperature video-rate terahertz imaging arrays. First, the noise characteristics of various imaging detectors, including low resistance

PDH-locked, frequency-stabilized cavity ring-down spectrometer

June 16, 2011
Author(s)
Joseph T. Hodges, A. Cygan, Piotr Maslowski, Katarzyna E. Bielska, S. Wojtewicz, J. Domyslawska, Hisashi Abe, R.S. Trawinski, R. Ciurylo
We describe a high sensitivity and high spectral resolution laser absorption spectrometer based upon the frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) technique. We used the Pound-Drever-Hall (PDH) method to lock the probe laser to the high

The Art of Data Evaluation

June 16, 2011
Author(s)
Ursula R. Kattner
The ability to critically screen the available data using the original publications is the foundation for a good evaluation. Examples for the analysis of data from different sources are given.

Hydrodynamic Fractionation of Finite Size Nano Gold Clusters

June 15, 2011
Author(s)
De-Hao D. Tsai, Tae Joon Cho, Frank W. DelRio, Julian S. Taurozzi, Michael R. Zachariah, Vincent A. Hackley
We demonstrate a high resolution in situ experimental method for performing simultaneous size-classification and characterization of functional nanoscale gold clusters (NGCs) based on asymmetric-flow field flow fractionation (AFFF). Field emission scanning

Time-resolved photoluminescence of lithographically defined quantum dots fabricated by electron beam lithography and wet chemical etching

June 15, 2011
Author(s)
Varun B. Verma, Martin J. Stevens, Kevin L. Silverman, Neville Dias, Akash Garg, James J. Coleman, Richard P. Mirin
We measure the time-resolved photoluminescence characteristics of a novel type of lithographically patterned quantum dot fabricated by electron beam lithography, wet chemical etching, and overgrowth of the barrier layers by metalorganic chemical vapor

A Combinatorial Approach to Detecting Buffer Overflow Vulnerabilities

June 14, 2011
Author(s)
Raghu N. Kacker, Yu Lei, David R. Kuhn, Wenhua Wang
Buffer overflow vulnerabilities are program defects that can cause a buffer overflow to occur at runtime. Many security attacks exploit buffer overflow vulnerabilities to compromise critical data structures. In this paper, we present a black-box testing

Comparison of segmentation algorithms for fluorescence microscopy images of cells

June 14, 2011
Author(s)
Alden A. Dima, John T. Elliott, James J. Filliben, Michael W. Halter, Adele P. Peskin, Javier Bernal, Marcin Kociolek, Mary C. Brady, Hai C. Tang, Anne L. Plant
Segmentation results from nine different segmentation techniques applied to two different cell lines and five different sets of imaging conditions were compared. Significant variability in the results of segmentation was observed that was due solely to

Indistinguishability of single photons from dissimilar single-photon sources

June 14, 2011
Author(s)
Sergey V. Polyakov, Glenn S. Solomon, Edward B. Flagg, Alan L. Migdall, Andreas Muller
In quantum mechanics, particles in identical states are indistinguishable, giving rise to effects with no classical analog. For instance, the bosonic nature of light insures that upon interference two indistinguishable photons will coalesce into a single

Polarized He-3 cell development and application at NIST

June 14, 2011
Author(s)
Thomas R. Gentile, WangChun Chen, Changbo Fu, Shannon Watson, Gordon L. Jones, J. W. McIver, D. R. Rich
Over a period of well over a decade, a large number and variety of polarized 3He cells for neutron applications have been developed and tested at the U.S. National Institute of Standards and Technology (NIST). These cells have primarily been employed for

Statistical analysis of fiber gripping effects on Kolsky bar test

June 14, 2011
Author(s)
Jae Hyun Kim, Nathanael A. Heckert, Stefan D. Leigh, Haruki Kobayashi, Walter G. McDonough, Richard L. Rhorer, Kirk D. Rice, Gale A. Holmes
Preliminary data for testing fibers at high strain rates using the Kolsky bar test by Ming Cheng et al. 1 indicated minimal effect of strain rate on the tensile stress-strain behavior of PPTA, poly (p-phenylene terephathalamide) fibers. In a different

Cryocoolers for Aircraft Superconducting Generators and Motors

June 13, 2011
Author(s)
Ray Radebaugh
The proposal by NASA to use high temperature superconducting (HTS) generators and motors on future (2035) aircraft for turboelectric propulsion imposes difficult requirements for cryocoolers. Net refrigeration powers of about 5 kW to 10 kW at 50 K to 65 K

Division Polynomials for Jacobi Quartic Curves

June 13, 2011
Author(s)
Dustin Moody
In this paper we fi nd division polynomials for Jacobi quartics. These curves are an alternate model for elliptic curves to the more common Weierstrass equation. Division polynomials for Weierstrass curves are well known, and the division polynomials we fi

Experiments with Linear Compressors for Phase Shifting in Pulse Tube Cryocoolers

June 13, 2011
Author(s)
Michael A. Lewis, Peter E. Bradley, Ray Radebaugh
For the past year NIST has been investigating the use of mechanical phase shifters as warm expanders for pulse tube cryocoolers. Unlike inertance tubes, which have a limited phase shifting ability at low acoustic powers, mechanical phase shifters have the
Displaying 24876 - 24900 of 73960
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