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Displaying 26701 - 26725 of 73832

Single photon detection timing jitter in a visible light photon counter

June 1, 2010
Author(s)
Burm Baek, Kyle S. McKay, Martin J. Stevens, Jungsang Kim, Henry H. Hogue, Sae Woo Nam
Visible light photon counters (VLPCs) offer many attractive features as photon detectors, such as high quantum efficiency and photon number resolution.We report measurements of the single-photon timing jitter in a VLPC, a critical performance factor in a

Standard Reference Material 640d for X-ray Metrology

June 1, 2010
Author(s)
David R. Black, Donald A. Windover, Albert Henins, David L. Gil, James J. Filliben, James P. Cline
The National Institute of Standards and Technology (NIST) certify a variety of standard reference materials (SRM) to address specific aspects of instrument performance for divergent beam diffractometers. This report describes SRM 640d, the fifth generation

Standard Reference Materials for Analysis of Dietary Supplements

June 1, 2010
Author(s)
Katherine E. Sharpless, David L. Duewer
NIST, in collaboration with the National Institutes of Health Office of Dietary Supplements (NIH-ODS) and the Food and Drug Administration (FDA) is producing Standard Reference Materials (SRMs) for dietary supplements. This paper describes the how these

The Mystery of Clustering in Macromolecular Media

June 1, 2010
Author(s)
Boualem Hammouda
Clustering prevails in water-soluble polymers and biological macromolecules. It has also been observed in polar solvent mixtures. The possible causes of clustering are discussed. A systematic investigation of clustering in poly(ethylene oxide)/d-water

Theoretical model of errors in micromirror-based three-dimensional particle tracking

June 1, 2010
Author(s)
Andrew J. Berglund, Matthew D. McMahon, Jabez J. McClelland, James A. Liddle
Several recently developed particle-tracking and imaging methods have achieved three-dimensional sensitivity through the introduction of angled micromirrors into the observation volume of an optical microscope. We model the imaging response of such devices

Theory for Polymer Analysis Using Nanopore-based Single-molecule Mass Spectrometry

June 1, 2010
Author(s)
Joseph E. Reiner, John J. Kasianowicz, Brian J. Nablo, Joseph W. Robertson
Nanometer-scale pores have demonstrated potential as a tool for the electrical detection and characterization of molecules. To provide a physical basis for nanopore-based analytical metrology, we show that a simple model quantitatively describes how one

Toxicokinetics, tissue-specific distribution and whole body burden of persistent organic pollutants in the bottlenose dolphin (Tursiops truncatus)

June 1, 2010
Author(s)
Jennifer Yordy, John R. Kucklick, D A. Pabst, William McLellan, Randall S. Wells, Teresa Rowles
The majority of exposure assessments for free-ranging cetaceans focus on contaminant concentrations measured in blubber, and there are few data for other tissues or the factors governing contaminant distribution between tissues. The goal of this study was

Wavelength bistability and switching in two-section quantum-dot diode lasers

June 1, 2010
Author(s)
Mingming M. Feng, Kevin L. Silverman, Richard P. Mirin, Steven T. Cundiff
We report lasing wavelength bistability with respect to applied bias on the saturable absorbers in two-section mode-locked quantum dot lasers. We show data from three different devices exhibiting wavelength bistability. All lasers display wavelength

Why are we concerned with large covariance matrices?

June 1, 2010
Author(s)
Paul D. Hale, Andrew M. Dienstfrey, Chih-Ming Wang
In order to promote discussion, we outline the two different paradigms for propagating uncertainties from the various waveform measurement impairments to the waveform parameters. The first method propagates uncertainty from the impairments directly to a

Sustainable Manufacturing: Metrics, Standards, and Infrastructure - Workshop Summary

May 31, 2010
Author(s)
Sudarsan Rachuri, Ram D. Sriram, Anantha Narayanan Narayanan, Prabir Sarkar, Jae H. Lee, Kevin W. Lyons, Sharon J. Kemmerer
This report summarizes the presentations, discussions, and recommendations of the NIST Workshop Sustainable Manufacturing: Metrics, Standards, and Infrastructure held at NIST, Gaithersburg, Maryland, USA, October 13th through October 15th, 2009. The

Manipulating Quantum Dots to Nanometer Precision by Control of Flow

May 28, 2010
Author(s)
Chad Ropp, Roland Probst, Zachary Cummins, Rakesh Kumar, Andrew J. Berglund, Srinivasa R. Raghavan, Edo Waks, Benjamin Shapiro
Controlled manipulation of quantum dots with nanometer precision is an essential capability for basic science as well as for scalable engineering of nanophotonic and nanoelectronic devices. The most common methods for manipulation of particles use optical

Observations of Nanobubble Formation on Carbon Nanotubes

May 28, 2010
Author(s)
Andrew J. Slifka, Damian S. Lauria, Gurpreet Singh, Roop L. Mahajan
We used an optical trap and a high-speed camera to image bubble initiation on the surface of multi-walled carbon nanotubes. The laser wavelength was 1064 nm and the average power was 100 mW. This is the first demonstration of bubble formation on individual

Digital Circuits Using Self-Shunted Nb/NbxSi1-x/Nb Josephson Junctions

May 27, 2010
Author(s)
David I. Olaya, Paul Dresselhaus, Samuel Benz, Anna Herr, Quentin Herr, alex Ioannidis, Donald Miller, Alan Kleinsasser
For the first time superconducting digital circuits based on novel Josephson junctions with amorphous niobium-silicon (a-NbSi) barriers were designed, fabricated and tested. Compared with the resistively shunted aluminum-oxide-barrier junctions that are

Identifying RF Identification Cards from Measurements of Resonance and Carrier Harmonics

May 27, 2010
Author(s)
Henry Romero, Kate Remley, Dylan Williams, Chih-Ming Wang, Timothy X. Brown
We show that careful measurements of the unloaded resonant frequency and quality factor of radio frequency identification proximity cards allow identification of different card models and, for the set of cards we studied, identification with minimal error

Surrogate Mixture Models for the Thermophysical Properties of Aviation Fuel Jet-A

May 27, 2010
Author(s)
Marcia L. Huber, Eric W. Lemmon, Thomas J. Bruno
We developed surrogate mixture models to represent the thermophysical properties of two samples of aviation turbine fuel Jet-A. One sample is a composite of numerous batches from a multiple manufacturers and is considered to be a representative fuel. A
Displaying 26701 - 26725 of 73832
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