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Displaying 31651 - 31675 of 73929

Spin-exchange Optical Pumping of 3He with Rb/K Mixtures and Pure K

December 31, 2007
Author(s)
Wangchun Chen, Thomas R. Gentile, S E. Babcock, T G. Walker
We have studied the efficiency of spin-exchange optical pumping (SEOP) in cells that contain either pure rubidium, mixtures of rubidium and potassium, or pure potassium. Optical pumping was performed with spectrally narrowed diode array lasers operating at

X-Ray and Gamma-Ray Absorbed Dose Profiles in Teeth: An EPR and Modelling Study

December 31, 2007
Author(s)
S Sholom, C M. O'Brien, E Bakhanova, V Chumak, Marc F. Desrosiers, A Bouville
Dose profiles in teeth have been experimentally and theoretically studied for different energies and geometries of incident X- and gamma-rays. The experiments were conducted with teeth inside of an Alderson phantom using monodirectional radiation beams at

EPR Tooth Dosimetry of SNTS Area Inhabitants

December 29, 2007
Author(s)
S Sholom, Marc F. Desrosiers, A Bouville, N Luckyanov, V Chumak, S L. Simon
Determination of external dose to teeth of inhabitants of settlements near the Semipalatinsk Nuclear Test Site (SNTS) was conducted using the EPR dosimetry technique to assess exposures associated with radioactive fallout from the test site. In this study

Equi-Axed Grain Formation in Electrodeposited Sn-Bi

December 29, 2007
Author(s)
E Sandnes, Maureen E. Williams, Mark D. Vaudin, Gery R. Stafford
Sn is widely used as a coating in the electronics industry because it provides excellent solderability, ductility, electrical conductivity and corrosion resistance. However, Sn whiskers have been observed to grow spontaneously from Sn electrodeposits and

Undoped polythiophene FETs with field-effect mobility of 1 cm^2 V^-1 s^-1

December 29, 2007
Author(s)
Behrang Hamadani, Iain McCulloch, Martin Heeney, David J. Gundlach
We report on charge transport in organic field-effect transistors based on (2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) as the active polymer layer with saturation field-effect mobilities as large as 1 cm2 V-1 s-1. The dependence of mobility

A Brief History of PRIDE

December 28, 2007
Author(s)
Zeid Kootbally, Craig I. Schlenoff, Rajmohan Madhavan
PRIDE (PRediction In Dynamic Environments) is a framework that provides an autonomous vehicle's planning system with information that it needs to perform path planning in the presence of moving objects. The underlying concept is based upon a multi

A Common Operator Control Unit Color Scheme for Mobile Robots

December 28, 2007
Author(s)
Michael O. Shneier, Roger V. Bostelman, James S. Albus, William P. Shackleford, Tommy Chang, Tsai Hong Hong
The Intelligent Systems Division at the National Institute of Standards and Technology (NIST) has partici-pated in the Defense Advanced Research Project Agency (DARPA) Learning Applied to Ground Robots (LAGR) project for the past 2 ? years. In Phase 2 of

A Framework for the Evaluation of Pervasive Information Systems

December 28, 2007
Author(s)
Jean C. Scholtz, Mary F. Theofanos, Sunny Consolvo
In this chapter we present a framework of areas of evaluation for pervasive information systems along with metrics and examples from the literature. We review a number of methodologies that have been used in evaluation. A case study of an evaluation using

Interoperability Testing for Shop Floor Measurement

December 28, 2007
Author(s)
Frederick M. Proctor, William G. Rippey, John A. Horst, Joseph Falco, Thomas Kramer
Manufactured parts are typically inspected to ensure quality. Inspection involves equipment and software from many different vendors, and interoperability is a major problem faced by manufacturers. The I++ Dimensional Measuring Equipment (DME)

Robot Simulation Physics Validation

December 28, 2007
Author(s)
Christopher T. Pepper, Stephen B. Balakirsky, Christopher J. Scrapper Jr
Computer simulation of robot performance is an essential tool for the development of robot software. In order for simulation results to be valid for implementation, model accuracy is important. If developers use a robot model that is not similar enough to

The Evolution of Performance Metrics in the RoboCup Rescue Virtual Robot Competition

December 28, 2007
Author(s)
Stephen B. Balakirsky, Christopher J. Scrapper Jr, Stefano Carpin
This paper presents an overview of the 2007 RoboCup Rescue Virtual Robot Competition and the performance metrics that were used to judge the competition. For this competition, great effort was placed in bringing together researchers with diverse interests

Toward Quantitative Fluorescence Measurements with Multicolor Flow Cytometry

December 28, 2007
Author(s)
Lili Wang, Adolfas Gaigalas, Gerald Marti, Fatima Abbasi, Robert A. Hoffman
A procedure is presented for calibrating the output of a multicolor flow cytometer in units of antibodies bound per cell (ABC). The procedure involves two steps. First, each of the fluorescence channels of the flow cytometer is calibrated using Ultra

Terahertz Spectroscopy of Biomolecules

December 22, 2007
Author(s)
David F. Plusquellic, Edwin J. Heilweil
Far-infrared (Terahertz or THz) spectroscopic investigations of condensed-phase biological and model organic species including substituted benzenes, amino acids, sugars, polypeptides, small proteins and DNA/RNA are reviewed. These studies reveal that for

'Ballistic' vs. 'Diffusive' Transport in Current-Induced Magnetization Switching

December 21, 2007
Author(s)
N Theodoropoulou, Abhishek Sharma, W Pratt, J. Bass, Mark D. Stiles, J Xiao
We test whether current-induced magnetization switching due to spin-transfer-torque in ferromagnetic/non-magnetic/ferromagnetic (F/N/F) trilayers changes significantly when scattering within the N-metal layers is changed from ballistic to diffusive. Here

NCWM PUB 15, Interim Meeting Agenda - January 2007

December 19, 2007
Author(s)
T Coleman, Steven E. Cook, Linda D. Crown, Ralph A. Richter, L T. Sebring, R C. Suiter, Juana S. Williams
This is the agenda for the four Standing Committees of the National Conference on Weights and Measures. This meeting will be held at the the Omni Jacksonville, Jacksonville, FL, on January 21 - 24, 2007.

Securing External Computers and Other Devices Used by Teleworkers

December 19, 2007
Author(s)
Shirley M. Radack
This bulletin summarizes the recommendations developed by NIST to help workers secure their external devices that they need for teleworking. The bulletin covers background information on telework technologies and the security issues related to the use of
Displaying 31651 - 31675 of 73929
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