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Displaying 44801 - 44825 of 73960

Underlying Technical Models for Information Technology Security

December 1, 2001
Author(s)
G Stoneburner
Underlying Technical Models for Information Technology Security provides a description of the technical foundations, termed models, that underlie secure information technology (IT). The intent is to provide, in a concise form, the models that should be

Upgrades to the NIST/DARPA EUV Reflectometry Facility

December 1, 2001
Author(s)
Charles S. Tarrio, Thomas B. Lucatorto, S Grantham, M B. Squires, Uwe Arp, Lu Deng
We have recently installed a new sample chamber at the NIST/DARPA EUV Reflectometry Facility at the National Institute of Standards and Technology. The chamber replaces a much smaller system on Beamline 7 at the Synchrotron Ultraviolet Radiation Facility

Video Transmission for Third Generation Mobile Communication Systems

December 1, 2001
Author(s)
Hamid Gharavi
This paper presents a method of transmitting video over the cdma2000 mobile systems. In this method, the video bit-stream, after splitting, is transmitted via the supplemental channels of the cdma2000 reverse link. The method takes advantage of the direct

Wide-Field X-Ray Microscopy with Kirkpatrick-Baez Optics

December 1, 2001
Author(s)
Terrence J. Jach, S M. Durbin, A S. Bakulin, David S. Bright, C B. Stagarescu, G Srajer, D. Haskel, J Pedulla
Modern technology permits us to fabricate Kirkpatrick-Baez (KB) multilayer optics with performance close to the theoretical limit. We have constructed a KB field-imaging microscope which operates in the x-ray energy range 6-10 keV with a field of view of

William John Youden

December 1, 2001
Author(s)
H H. Ku, Joan R. Rosenblatt
ginning with the balanced incomplete block designs known as Youden Spuares, W.J. Youden created many designs tailored to the needs of the physical and engineering sciences.

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
Displaying 44801 - 44825 of 73960
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