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Displaying 26551 - 26575 of 73697

Blog Track Research at TREC

June 1, 2010
Author(s)
Ian M. Soboroff, Craig Macdonald, Rodrygo Santos, Iadh Ounis
The TREC Blog track aims to explore information seeking behaviour in the blogosphere, by building reusable test collections for blog-related search tasks. Since, its advent in TREC 2006, the Blog track has led to much research in this growing field, and

Certification of NIST Standard Reference Material 640d

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

Certification of Three NIST Renewal Soil Standard Reference Materials(R) for Element Content: SRM 2709a San Joaquin Soil, SRM 2710a Montana Soil I, and SRM 2711a Montana Soil II

June 1, 2010
Author(s)
Elizabeth A. Mackey, Christopher S. Johnson, Richard M. Lindstrom, Stephen E. Long, Anthony F. Marlow, Karen E. Murphy, Rick L. Paul, Rachel S. Popelka-Filcoff, Savelas A. Rabb, John R. Sieber, Rabia Oflaz, Bryan E. Tomlin, Laura J. Wood, James H. Yen, Lee L. Yu, Rolf L. Zeisler, S. A. Wilson, M. G. Adams, Z. A. Brown, P. L. Lamothe, J. E. Taggart, C. Jones, J. Nebelsick
For the past 20 y, the National Institute of Standards and Technology has provided three soil Standard Reference Materials certified for element content: SRM 2709 San Joaquin Soil (Baseline Trace Element Concentrations); SRM 2710 Montana Soil I (Highly

Compact and Distributed Modeling of Cryogenic Bulk MOSFET Operation

June 1, 2010
Author(s)
Akin Akturk, M. Holloway, S. Potbhare, David J. Gundlach, B Li, Neil Goldsman, M Peckerar, Kin P. Cheung
We have developed compact and physics-based distributed numerical models for cryogenic bulkMOSFET operation down to 20 K to advance simulation and first-pass design of device and circuit operation at low temperatures. To achieve this, we measured and

Cylindrical Acoustic Resonator for the Re-determination of the Boltzmann Constant

June 1, 2010
Author(s)
J.T. Zhang, H. Lin, X.J. Feng, Keith A. Gillis, Michael R. Moldover
We describe progress towards re-determining the Boltzmann constant k B using two fixed-path, gas-filled, cylindrical, acoustic cavity resonators. The longitudinal acoustic resonance modes of a cylindrical cavity have lower quality factors Q than the radial

Feasibility of an Accurate Dynamic Standard for Water Flow

June 1, 2010
Author(s)
Iosif I. Shinder, Michael R. Moldover
We used NIST's primary water flow standard to study the feasibility of accurately determining mass flow rates m dot of water "dynamically," that is from the time derivative of the weight W of the collection tank: m dot,dynamic = (dW/dt)/g. When data for a

Quality Focus: Certified Reference Materials

June 1, 2010
Author(s)
Katherine E. Sharpless
In June of this year, the final stage of the staggered implementation of current Good Manufacturing Practices (cGMPs) took effect, requiring all domestic and foreign companies that manufacture, package, label, or hold dietary supplements to comply with its

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
Displaying 26551 - 26575 of 73697
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