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Displaying 31376 - 31400 of 74066

Concordance Study Between the AmpFlSTR((R)) MiniFiler(TM) PCR Amplification Kit and Conventional STR Typing Kits

July 25, 2007
Author(s)
Carolyn R. Steffen, Margaret C. Kline, Julio J. Mulero, Robert E. Lagace, Chien-Wei Chang, Lori K. Hennessy, John M. Butler
The AmpFlSTR MiniFiler PCR Amplification kit developed by Applied Biosystems enables size reduction on eight of the larger short tandem repeat (STR) loci amplified in the Identifiler kit, which will aid recovery of information from highly degraded DNA

Conformance Checking of Access Control Policies Specified in XACML

July 24, 2007
Author(s)
Vincent C. Hu, Evan Martin, Tao Xie
Access control is one of the most fundamental and widely used security mechanisms. Access control mechanisms control which principals such as users or processes have access to which resources in a system. To facilitate managing and maintaining access

Narrow linewidth 1.5 ym sources and the thermal limit

July 23, 2007
Author(s)
William C. Swann, Nathan R. Newbury
A measured 1 Hz linewidth between a cavity-stabilized, 1535 nm cw fiber laser and the 1535-nm tooth of a stabilized fiber frequency comb is below the thermodynamic limit of the frequency comb.

Problems with Kendall's Tau

July 23, 2007
Author(s)
Mark Sanderson, Ian Soboroff
Test collections are most useful when they are reusable, that is, when they can be reliably used to rank systems that did not contribute to the pools. Pooled relevance judgments for very large collections may not be reusable for two reasons: they will be

Reliable Information Retrieval Evaluation With Incomplete and Biased Judgements

July 23, 2007
Author(s)
Stefan Buttcher, Charles L. Clarke, Peter C. Yeung, Ian Soboroff
Information retrieval evaluation based on the pooling method is inherently biased against systems that did not contribute to the pool of judged documents. This may distort the results obtained about the relative quality of the systems evaluated and thus

Slab-coupled optical waveguide devices for low-noise signal generation

July 23, 2007
Author(s)
Paul W. Juodawlkis, Frederick J. O'Donnell, Jason J. Plant, John B. Schlager
We review the use of slab-coupled optical waveguide amplifiers (SCOWAs) in low-noise mode-locked and single-frequency lasers. We also report a new single-frequency laser cavity incorporating an Er/Yb-codoped waveguide distributed Bragg-reflector that

Voltage Instability in a Simulated Fuel Cell Stack Correlated to Cathode Water Accumulation

July 22, 2007
Author(s)
Jon P. Owejan, T Trabold, Jeffrey J. Gagliardo, Robert N. Carter, Daniel S. Hussey, David L. Jacobson, Muhammad D. Arif
Single fuel cells running independently are often used for fundamental studies of water transport. It is also necessary to assess the dynamic behavior of fuel cell stacks comprised of multiple cells arranged in series, thus providing many paths for flow of

Low-noise fiber-laser frequency combs

July 19, 2007
Author(s)
Nathan R. Newbury, William C. Swann
We discuss experimental and theoretical aspects of a low-noise fiber-laser frequency comb, including the experimental configuration and the major contributions to the frequency noise and linewidth of the individual comb modes. Intra-cavity noise sources

Verification, Validation, and Variability of Virtual Standards

July 18, 2007
Author(s)
Dale P. Bentz
As the potential of computer modeling of hydration and microstructure development of cement-based materials approaches realization, the development of virtual standard test methods becomes a viable possibility. In creating these virtual standards, just as

Bias and the Limits of Pooling for Large Collections

July 17, 2007
Author(s)
C E. Buckley, Darrin L. Dimmick, Ian Soboroff, Ellen M. Voorhees
Modern retrieval test collections are built through a process called pooling in which only a sample of the entire document set is judged for each topic. The idea behind pooling is to find enough relevant documents such that when unjudged documents are

Border Gateway Protocol Security

July 17, 2007
Author(s)
D. Richard Kuhn, Kotikalapudi Sriram, Douglas Montgomery
This document introduces the Border Gateway Protocol (BGP), explains its importance to the internet, and provides a set of best practices that can help in protecting BGP. Best practices described here are intended to be implementable on nearly all

Impedance Measurements of Inertance Tubes at High Frequency and Pressure

July 16, 2007
Author(s)
Michael A. Lewis, Ryan P. Taylor, Peter E. Bradley, Ray Radebaugh, Gershon Grossman, Zhihua Gan
Previous comparisons between measured and calculated inertance tube impedance were made at frequencies below 70 Hz and average pressures below 3 MPa. In this paper, we present results on similar comparisons for frequencies up to 150 Hz and average

Model, Prediction and Experimental Verification of Composition and Thickness in Continuous Spread Thin Film Combinatorial Libraries Grown by Pulsed Laser Deposition

July 16, 2007
Author(s)
Nabil Bassim, Peter K. Schenck, Makoto Otani, Hiroyuki Oguchi
Pulsed laser deposition (PLD) is a powerful technique for growing continuous spread thin film libraries of continuously varying composition as a function of position on a substrate. Continuous spread thin film libraries are grown by striking a ceramic

MODELING AND EXPERIMENTS ON FAST COOLDOWN OF A 120 Hz PULSE TUBE CRYOCOOLER

July 16, 2007
Author(s)
Srinivas Vanapalli, Michael A. Lewis, Gershon Grossman, Zhihua Gan, Ray Radebaugh, H.J. M. ter Brake
High frequency operation of a pulse tube cryocooler leads to reduced regenerator volume, which results in a reduced heat capacity and a faster cooldown time. A pulse tube cryocooler operating at a frequency of 120 Hz and an average pressure of 3.5 MPa

A Virtual Rapid Chloride Permeability Test

July 15, 2007
Author(s)
Dale P. Bentz
The rapid chloride permeability test (RCPT), as it is commonly called, has been in existence for over 20 years and was standardized by ASTM over 15 years ago. The test is used extensively in the concrete industry for assessing concrete quality and is now
Displaying 31376 - 31400 of 74066