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Displaying 44776 - 44800 of 73929

Computers Forensics Guidance

November 30, 2001
Author(s)
G E. Fisher
This ITL Bulletin describes two projects in the computer forensics arena and provides guidance on the use of the products developed from them. The first project, the National Software Reference Library (NSRL), describes a database of known file

Wideband Frequency-Domain Characterization of High-Impedance Probes

November 30, 2001
Author(s)
Uwe Arz, Howard C. Reader, Pavel Kabos, Dylan F. Williams
In this paper we investigate the broadband microwave properties of high-impedance probes designed for on-wafer waveform measurements. We show that the standard two-tier characterization method fails. We introduce two new methods of characterization, both

Micromachined Arrays as Sensor Platforms and Materials Research Tools

November 27, 2001
Author(s)
Stephen Semancik, Richard E. Cavicchi
We describe temperature-controlled elements called microhotplates which are formed by micromachining Si, as well as thin film deposition methods and interfacial phenomena, utilized to create low power, application-tunable microdevices for analyzing gases

Advanced Encryption Standard (AES)

November 26, 2001
Author(s)
National Institute of Standards and Technology (NIST), Morris J. Dworkin, Elaine Barker, James R. Nechvatal, James Foti, Lawrence E. Bassham, E. Roback, James F. Dray Jr.
The Advanced Encryption Standard (AES) specifies a FIPS-approved cryptographic algorithm that can be used to protect electronic data. The AES algorithm is a symmetric block cipher that can encrypt (encipher) and decrypt (decipher) information. Encryption

Overview of the TREC 2001 Question Answering Track

November 26, 2001
Author(s)
Ellen M. Voorhees
The TREC question answering track is an effort to bring the benefits of large-scale evaluation to bear on the question answering problem. In its third year, the track continued to focus on retrieving small snippets of text that contain an answer to a

All-NbN Digital-to-Analog Converters for a Programmable Voltage Standard

November 21, 2001
Author(s)
Hirotake Yamamori, M. Itoh, H. Sasaki, A. Shoji, Samuel Benz, Paul Dresselhaus
Five-bit all-NbN digital-to-analog converters (DACs) for a programmable voltage standard have been fabricated using NbN/TiNx/NbN Josephson junctions and their operation has been demonstrated. The DAC consists of six arrays of 128, 128, 256, 512, 1024 and

An Intelligent World Model for Autonomous Off-Road Driving

November 21, 2001
Author(s)
Tommy Chang, Tsai Hong Hong, Marilyn N. Abrams, Michael O. Shneier
This paper describes a world model designed to act as a bridge between multiple sensory inputs and a behavior generation (path planning) subsystem for off-road autonomous driving. It describes how the world model map is built and how the objects and

Rate Constants for Unimolecular Decomposition of SF 6 -

November 21, 2001
Author(s)
Yicheng Wang, R. Champion, I. V. Dyakov, B. Peko
Insulating gas mixtures containing SF 6 have been promoted to serve as replacements for pure SF 6 in order to reduce SF 6 atmospheric emission. It has been argued that some synergism may be achieved by choosing proper buffer gases in mixtures with SF 6

Study of Isochoric Specific Heat Capacity Measurements for Liquid Water-Methanol Mixtures

November 20, 2001
Author(s)
Hiroshi Kitajima, Hiroyuki Miyamoto, Noboru Kagawa, Joe W. Magee, Harumi Endo, Seizo Tsuruno, Koichi Watanabe
Hydrogen bonding of water (H 2O) is certain to introduce an effect of the molecular energy to the heat capacity. Due to the presence of the strong hydrogen bonding, interactions between water and methanol (CH 3OH) molecules show anomalous thermodynamic

The TREC-9 Interactive Track Report

November 19, 2001
Author(s)
William Hersh, Paul D. Over
The TREC-9 Interactive Track has the goal of investigating interactive information retrieval by examining the process as well as the results. In TREC-9, six research groups ran a total of 12 interactive information retrieval (IR) system variants on a

1 H- 31 P CPMG-Correlated Experiments for the Assignment of Nucleic Acids

November 14, 2001
Author(s)
B. Luy, John Marino
Phosphorus (31P) nuclear magnetic resonance (NMR) spectroscopy can provide important information about the structure and dynamics of nucleic acids in solution. The application of 31P NMR, however, often requires the difficult task of resolving and

Noise Parameter Uncertainties from Monte Carlo Simulations

November 8, 2001
Author(s)
James P. Randa, Wojciech Wiatr
We present results for uncertainties in noise-parameter measurements, obtained using a Monte Carlo simulation of the measurements. Sets of data were generated to simulate measurements on a low-noise amplifier, with given uncertainties in the underlying

The 2001 Annual Meeting of the American Crystallographic Association

November 6, 2001
Author(s)
Alan D. Mighell
The annual meeting of the American Crystallographic Association was held in Los Angeles, California, July 2126, 2001. The scientific sessions and the exhibit show were held in the Westin Bonaventure Hotel in downtownLos Angeles. The meeting was well

Excellent charge offset stability in a Si-based single-electron tunneling transistor

November 5, 2001
Author(s)
Neil M. Zimmerman, W H. Huber, Akira Fujiwara, Yasuo Takahashi
We have measured the long-term drift and the short-term 1/f noise in the charge offset Q0(t) in two Si-based single-electron tunneling transistors (SETTs). In contrast to metal-based SETTs, these devices show excellent charge stability, drifting by less

1,2-Pentadiene Decomposition

November 1, 2001
Author(s)
J Herzler, Jeffrey A. Manion, Wing Tsang
1,2-Pentadiene has been decomposed in single pulse shock tube experiments. There appear to be a large number of parallel decomposition and isomerization channels. The following rate expressions for isomerization in the temperature range 1100 K-1250 K and 2

2 Combinatorial Methods Polymer Science: Synthesis and Characterization

November 1, 2001
Author(s)
J C. Meredith, A P. Smith, Alamgir Karim, Eric J. Amis
Combinatorial methodologies offer the ability to efficiently measure relevant chemical and physical properties over lare regimes of varible space. We review recent work in the development of combinatorial methods for polymer synthesis and characterization

A 2.4mm Coaxial Power Standard at NIST

November 1, 2001
Author(s)
Thomas P. Crowley, Fred R. Clague
A microcalorimeter and bolometer transfer standard are used as a national standard for microwave power from 50 MHz to 50 GHz. the microcalorimeter is used to determine the efficiency of the bolometric transfer standards and is similar to an existing Type N

Amorphous Calcium Phosphate

November 1, 2001
Author(s)
Laurence C. Chow, E D. Eanes
Amorphous structures represent about 20% of the 60 or so different mineral types formed by the action of living organisms. Among these biogenic amorphous minerals, those that are composed principally of calcium and phosphate are most abundant in the teeth
Displaying 44776 - 44800 of 73929
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