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Displaying 31276 - 31300 of 74165

Evidence for an Indirect Gap in B-FeSi2 Epilayers by Photoreflectance Spectroscopy

May 27, 2008
Author(s)
Anthony Birdwell, Christopher Littler, R Glosser, M Rebien, W Henrion, P Stauss, G Behr
Photoreflectance spectra obtained from epitaxial films of semiconducting Β-FeSi2 exhibit complex line shapes resulting from a variety of optical transitions. While we have previously established a direct gap at 0.934{plus or minus}0.002 eV at 75 K, we find

The Challenge of Measuring Defects in Nanoscale Dielectrics

May 26, 2008
Author(s)
Kin P. Cheung, John S. Suehle
Defects in nanoscale gate dielectric of MOS devices can exchange charges with the substrate via quantum mechanical tunneling. This characteristic has been utilized in many measurement methods to measure the defects and its spatial distribution. In some

Mechanical and electrical coupling at metal-insulator-metal nano-scale contacts

May 22, 2008
Author(s)
Doo-In Kim, Pradeep Namboodiri, Frank W. DelRio, Robert F. Cook
Mechanical and electrical coupling at nano-scale metallic contacts was investigated using a conducting-probe atomic force microscope (AFM). The current-voltage responses were non-Ohmic, symmetric about zero bias, with conductance values smaller than the

The NIST Hash Competition

May 20, 2008
Author(s)
William E. Burr
Since the discovery of collision attacks against several well known cryptographic hash functions in 2004 there has been a rush of new cryptanalytic results that cast doubt on our current hash function standards. The relatively new NIST SHA-2 standards are

A Line-Based Obstacle Avoidance Technique for Dexterous Manipulator Operations

May 19, 2008
Author(s)
Nicholas A. Scott, Craig R. Carignan
Cameras are often used for visual servoing or realtime mapping of the external environment in both autonomous and teleoperated tasks with a dexterous manipulator. Nominal operations will likely produce manipulator configurations that occlude the line-of

Capacity of Random Wireless Networks: Impact of Cooperative Network Coding

May 19, 2008
Author(s)
Yi Qian, Kejie Lu, Shengli Fu
The throughput capacity of random wireless networks has been studied extensively in the literature. Nevertheless, most existing studies are based on the assumption that each transmission has one sender and one receiver. In our recent study, we have

Dark Resonance in Bichromatic Linearly Polarized Optical Field on Cs D 1 Line

May 19, 2008
Author(s)
Ken-ichi Watabe, Takeshi Ikegami, Akifumi Takamizawa, Shinya Yanagimachi, Shin-ichi Ohshima, Svenja A. Knappe
We describe a simple method for observing high-contrast coherent population trapping signals on the Cs D 1 line. The high-contrast signals were achieved by use of a bichromatic linear polarized light (lin || lin field).

Development Life Cycle and Tools for Data Exchange Specification

May 19, 2008
Author(s)
Katherine C. Morris, Puja Goyal, Simon P. Frechette
In enterprise integration, a data exchange specification is an architectural artifact that evolves along with the business. Developing and maintaining a coherent semantic model for data exchange is an important, yet non-trivial, task. A coherent semantic

ER Simulation Prototypes for Incident Management Training

May 19, 2008
Author(s)
Guodong Shao, Charles R. McLean
First responders and incident management personnel need better training resources to prepare for future disasters. Live training exercises while valuable are often very expensive to organize and conduct. Training using modeling, simulation, and gaming

Homeland Security Simulation Domain: A Needs Analysis Overview

May 19, 2008
Author(s)
Charles R. McLean, Sanjay Jain, Yung-Tsun T. Lee
The effective use of modeling, simulation, and analysis (MSA) applications could greatly enhance our nation s ability to achieve homeland security goals. The development of MSA applications has been conducted largely on an ad hoc and piecemeal basis. There

Microfabricated Atomic Magnetometers and Applications

May 19, 2008
Author(s)
John E. Kitching, Svenja A. Knappe, Vishal Shah, P Schwindt, William C. Griffith, Ricardo Jimenez Martinez, Jan Preusser
We describe recent work at NIST to develop compact, sensitive atomic magnetometers using a combination of precision optical spectroscopy, atomic physics and techniques of micro-electro-mechanical systems (MEMS). These instruments have sensor head volumes

The Role of Folding in the Degradation of Ballistic Fibers

May 19, 2008
Author(s)
Walter G. McDonough, Gale A. Holmes, Jae Hyun Kim, Derek L. Ho
Research has indicated that the folding of ballistic fibers comprising soft body armor may be a factor in the performance deterioration that has been observed. To quantify the impact of this failure mechanism on body armor performance, an apparatus was
Displaying 31276 - 31300 of 74165
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