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Displaying 32151 - 32175 of 74084

A Comprehensive Evaluation of Indoor ranging using Ultra-Wideband Technology

January 15, 2007
Author(s)
Camillo Gentile, El Kik
Ultra-wideband technology shows promise for precision ranging due to its fine time resolution to resolve multipath fading and the presence of lower frequencies in the baseband to penetrate walls. While a concerted effort has been conducted in the extensive

Hemispherical Imaging of Skin With Polarized Light

January 15, 2007
Author(s)
J C. Ramella-Roman, Bruno Boulbry, Thomas A. Germer
Polarized light imaging has been used in the past for skin-cancer edge detection from skin lesions. In the standard imaging modality, the source, detector, and sample are usually aligned in the same plane, and the effect of the air-skin boundary is

Biaxial Stress Dependence of AlxGa 1-x As Photoluminescence

January 13, 2007
Author(s)
Grady S. White, Albert J. Paul, Kristine A. Bertness, Lawrence H. Robins
A study was conducted of the room temperature photoluminescence behavior of AlxGa1-xAs as a function of tensile, equi-biaxial stress for x = 0, 0.198, 0.36, 0.498, and 0.809. The composition range included both the direct and the indirect band gap regions

Tax Incentives for Innovation: Time to Restructure the R&E Tax Credit

January 12, 2007
Author(s)
Gregory C. Tassey
The R&E tax credit was originally designed incorrectly, and subsequent attempts to restructure it have not addressed the major deficiencies. Moreover, in the 25 years since the R&E tax credit was enacted, a steadily increasing number of countries have

Accuracy of Unconditionally Stable Algorithms in Cahn-Hilliard Systems

January 11, 2007
Author(s)
Mowei Cheng, James A. Warren
Given an unconditionally stable algorithm for solving the Cahn-Hilliard equations, we provide the mathematical basis for arbitrary accuracy -- we present a general calculation for an analytical time step Δ Tau in terms of an algorithmic time step Δ Tau. By

A Standard Reporting Format for Summative Usability Evaluations

January 10, 2007
Author(s)
Jean C. Scholtz, Emile L. Morse
Poor usability is an uncontrolled source of overhead, caused by the need for users to correct errors and continually re-learn complex user interfaces. Software that is measurably usable reduces errors, reduces training costs, and reduces maintenance costs

The Importance of Focused Evaluations: A Case Study of TREC and DUC

January 10, 2007
Author(s)
Donna K. Harman
Evaluation has always been an important part of scientific research, and in information retrieval, this evaluation has mostly been done using test collections. In 1992 a new test collection was built at the National Institute of Standards and Technology

A Pel-Recursive Motion Estimation Algorithm

January 9, 2007
Author(s)
Hamid Gharavi, H Reza-alikhani
This paper presents a new pel recursive motion estimation algorithm for video coding applications. The derivation of the algorithm is based on Recursive Least-Squares (RLS) estimation that minimizes the mean square prediction error. A comparison with the

TRC Thermodynamics Tables - Non-Hydrocarbons, Supplement NH-96

January 9, 2007
Author(s)
Michael D. Frenkel
1. Table 23-2-1-(1.16110)-db - Pages db-5832.0 and db-5832.1 New table for dipropyl maleate containing the density for the real fluid at selected temperatures and pressures. 2. Table 23-2-1-(1.16150)-db - Pages db-5838.0 and db-5838.1 New table for

DHS/NIST Response Robot Evaluation Exercises

January 8, 2007
Author(s)
Adam S. Jacoff, Elena R. Messina
The Department of Homeland Security, through the Science and Technology Directorate Standards Program, is developing performance standards for robots applied to urban search and rescue (US&R). The National Institute of Standards and Technology (NIST) is

Spin Torque for Dummies

January 6, 2007
Author(s)
Thomas J. Silva
I will present a stripped down presentation on the fundamental mechanisms that give rise to spin torque effects. This presentation will assume the audience has little or no background in this fascinating and rapidly expanding field. We will start with an

Frequency Dependence of the Nonlinear Response in YBA2Cu307-x Transmission Lines

January 5, 2007
Author(s)
Jordi Mateu, James Booth, Brian Moeckly
We evaluate the frequency dependence of the nonlinear response in High Temperature Superconductor YBa2Cu3O7-x thin films by simultaneously measuring the nonlinear intermodulation products and harmonic generation in broadband superconducting transmission

Long distance decoy state quantum key distribution in optical fiber

January 5, 2007
Author(s)
Danna Rosenberg, Jim A. Harrington, Patrick R. Rice, Philip A. Hiskett, Charles G. Peterson, Richard J. Hughes, Jane E. Nordholt, Adriana Lita, Sae Woo Nam
The theoretical existence of photon-number-splitting attacks creates a security loophole for most quantum key distribution (QKD) demonstrations that use a highly attenuated laser source. Using ultralow-noise, high-efficiency transition-edge sensor

On the Vickers Indentation Fracture Toughness Test

January 4, 2007
Author(s)
George D. Quinn, Richard Bradt
The Vickers indentation fracture toughness test or VIF is addressed by considering its origins and the numerous equations that have been applied along with the technique to estimate the fracture resistance, or the KIc of ceramics. Initiation and

Web Application Scanners: Definitions and Functions

January 3, 2007
Author(s)
Elizabeth N. Fong, Vadim Okun
There are many commercial software security assurance tools that claim to detect and prevent vulnerabilities in application software. However, a closer look at the tools often leaves one wondering which tools find what flaws? This paper identifies a
Displaying 32151 - 32175 of 74084