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Displaying 40926 - 40950 of 73969

Noninvasive Detection of Weapons of Mass Destruction Using Terahertz Radiation

July 1, 2003
Author(s)
M B. Campbell, Edwin J. Heilweil
The growing and immediate threat of biological and chemical weapons has placed urgency on the development of chemical and biological warfare agent (CWA/BWA) and explosive material screening devices. Specifically, the ability to detect CWA/BWA or explosives

On the Measurement and Prediction of Temperature Fields in Machining AISI 1-45 Steel

July 1, 2003
Author(s)
Matthew A. Davies, Q Cao, A L. Cooke, Robert W. Ivester
Infrared microscopic measurements of the temperature fields at the tool-chip interface in steady-state, orthogonal, machining of AISI 1045 steel are presented for a range of chip thicknesses. The measurements are verified using an energy balance method and

Order/Disorder in Electrodeposited Aluminum-Titanium Alloys

July 1, 2003
Author(s)
Gery R. Stafford, T Tsuda, C L. Hussey
The composition, morphology, and crystallographic microstructure of Al-Ti alloys electrodeposited from two Different chloroaluminate molten salt electrolytes were examined. Alloys containing up to 28% atomic fraction Ti were electrodeposited at 150 oC from

Oxidative DNA Damage: Mechanisms, Mutation, and Disease

July 1, 2003
Author(s)
M S. Cooke, M D. Evans, M. Dizdaroglu, J Lunec
Oxidative DNA damage is an inevitable consequence of cellular metabolism, with a propensity for increased levels following toxic insult. Although more than base lesions have been identified, only a fraction of these have received any appreciable study

Particles in Silicon Depositon Discharges

July 1, 2003
Author(s)
Alan Gallagher, G Bano, K Rozsa
In a radio frequency or high frequency discharge, electrons are accelerated toward the central plasma region by oscillating sheath electric fields. In a dc discharge, a cathode sheath field provides steady electron acceleration into the plasma. These

Physical Measurement of Flashing Lights - Now and Then

July 1, 2003
Author(s)
Yoshihiro Ohno
This paper begins with a historical review of flashing lights and physical measurement of flashing lights since the time the Blondel-Rey equation was developed. Then the recent work on the physical measurement standards for flashing lights, developed in

Picture Password: A Visual Login Technique for Mobile Devices

July 1, 2003
Author(s)
Wayne Jansen, Serban I. Gavrila, Vladimir Korolev, Richard P. Ayers, Ryan Swanstrom
Adequate user authentication is a persistent problem, particularly with handheld devices, which tend to be highly personal and at the fringes of an organization's influence. Yet, these devices are being used increasingly in corporate settings where they

Polysilane Production in RF SiH 4 and H 2 - SiH 4 Plasmas

July 1, 2003
Author(s)
P Horvath
Stable gases produced in SiH 4 and H 2-SiH 4, capacitively-coupled RF discharges, operated at typical device-production conditions, were investigated by quadrupole mass spectrometry. The production of di- and trisilane, the depletion of silane and pressure

Public Key Infrastructures That Safisfy Security Goals

July 1, 2003
Author(s)
William T. Polk, Nelson E. Hastings, A Malpani
This article describes the features of different PKI architectures, and the motivations behind their use. While some PKI architectures (e.g., hierarchies) are very simple, political and social realities encourage deployment of more complex (e.g., mesh)

Quantum Information With Neutral Atoms as Qubits

July 1, 2003
Author(s)
James V. Porto, S L. Rolston, B L. Tolra, Carl J. Williams, William D. Phillips
Neutral atoms trapped in periodic optical potentials (optical lattices) offer a possible route toward quantum computation. The atoms can be kept well isolated from the environment, yet can be easily manipulated with the tools of atomic physics. This paper

Quantum Information With Neutral Atoms as Quibits

July 1, 2003
Author(s)
James V. Porto, S L. Rolston, B L. Tolra, Carl J. Williams, William D. Phillips
One of the essential features of a quantum computer is a quantum register of well-characterized qubits. Neural atoms in optical lattices are a natural candidate for such a register. We have demonstrated a pattern loading technique that can be used to load

Report of Experimental Results for Tests 2,3, and 4 of the International Fire Model Benchmarking and Validation Exercise #3

July 1, 2003
Author(s)
Anthony P. Hamins, Michelle K. Donnelly, Erik L. Johnsson, Alexander Maranghides, George W. Mulholland
As part of its Fire Risk Research Program, the NRC (Nuclear Regulatory Commission) and NIST (National Institute of Standards and Technology) are participating in an International Collaborative Fire Model Project (ICFMP) to assess and validate fire computer

Resonant Soft X-Ray Photofragmentation of Propane

July 1, 2003
Author(s)
William E. Wallace, Daniel A. Fischer
A comparison was made between the mass spectra of propane (CH6d3^CH 2CH 3) for resonant soft X-ray photofragmentation and electron-impact ionization. The soft X-ray photon energy was tuned to 287.7 eV to promote Auger relaxations from the C-H bonds (1s _>

Rotational Spectroscopy of Vibrationally Excited States by Infrared-Fourier Transform Microwave-Microwave Triple-Resonance Spectroscopy

July 1, 2003
Author(s)
K O. Douglass, J C. Keske, F S. Rees, K Welch, H S. Yoo, Brooks H. Pate, I Leonov, R D. Suenram
A Fourier transform microwave (FTMW) spectroscopy technique for measuring the rotational spectra of vibrational excited states is demonstrated. A pulsed infrared laser is used to prepare the excited state outside the FTMW cavity. Following laser excitation

Semiconductor Microelectronics and Nanoelectronics Programs

July 1, 2003
Author(s)
Stephen Knight, Joaquin (. Martinez, Michele L. Buckley
The microelectronics industry supplies vital components to the electronics industry and to the U.S. economy, enabling rapid imporvements in productivity and in new high technology growth industries such as electronic commerce and biotechnology. The

Structural, Electronic, and Magnetic Properties of Heterofullerene C 48 B 12

July 1, 2003
Author(s)
Rui-Hua Xie, L Jensen, Garnett W. Bryant, J Zhao, V H. Smith
Bonding, electric (hyper) polarizability; vibrational and magnetic properties of heterofullerene C 48B 12 are studied by first-principles calculations. Infrared- and Raman-active vibrational frequencies of C 48B 12 are assigned. Eight 13C and two 11B
Displaying 40926 - 40950 of 73969
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