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Displaying 32126 - 32150 of 74066

Charge Offset Stability in Tunable-Barrier Si SET Devices

January 17, 2007
Author(s)
Neil M. Zimmerman, Brian Simonds, Mikio Fujiwara, Yukinori Ono, Yasuo Takahashi, Hiroshi Inokawa
The problem of charge offset drift in single-electron tunneling devices, based on the Coulomb blockade, can preclude their useful application in metrology and integrated devices. We demonstrate that in tunable-barrier Si-based SET transistors there is

A Measurement of Propagation Delay

January 16, 2007
Author(s)
Donald R. Larson, Nicholas Paulter
A measurement method and associated uncertainty analysis have been developed for the measurement of propagation or group delay in electrical transmission lines and optical fibers. The measurement method and uncertainty analysis were applied to measurements

Analysis of C-S-H Gel and Cement Paste by Small-Angle Neutron Scattering

January 16, 2007
Author(s)
Andrew J. Allen, J Thomas
The role of small-angle x-ray and neutron scattering (SAXS and SANS) in the characterization of cement is briefly reviewed. The unique information obtainable from SANS analysis of C-S-H gel in hydrating cement is compared with that obtainable by other

Composition and Density of Amorphous Calcium-Silicate-Hydrate in Cement

January 16, 2007
Author(s)
Andrew J. Allen, J Thomas, Hamlin M. Jennings
Despite intensive research for over a century, the main binding reaction product of cement hydration, calcium-silicate-hydrate (C-S-H) gel, is not fully understood. By combining absolute-calibrated small-angle and ultrasmall-angle neutron and x-ray

Measuring Molecular Order in Poly(3-alkylthiophene) Thin Films with Polarizing Spectroscopies

January 16, 2007
Author(s)
Marc Gurau, Dean DeLongchamp, Brandon M. Vogel, Eric K. Lin, Daniel A. Fischer, S Sambasivan, Lee J. Richter
We measured the molecular order of poly(3-alkylthiophene) chains in thin films before and after melting through the combination of several polarized photon spectroscopies: infrared (IR) absorption, variable angle spectroscopic ellipsometry (SE), and near

Synthesis and Structural Characterization of Glucopyranosylamide Films on Gold

January 16, 2007
Author(s)
Mridula Kadalbajoo, J J. Park, A Opdahl, Hiromi Suda, Kitchens A. C, Jayne C. Garno, J Batteas, Michael J. Tarlov, Phillip DeShong
Stereoselective synthesis of a- and b-linked glucopyranosylamide derivatives via the in situ generation of glucosyl isoxazolines has been performed utilizing a modified Staudinger methodology. Glucopyranosylamides were derivatized with thiol

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
Displaying 32126 - 32150 of 74066