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Search Publications

NIST Authors in Bold

Displaying 41176 - 41200 of 73697

Relative Permittivity and Refractive Index

March 28, 2003
Author(s)
Michael R. Moldover, K N. Marsh, J M. Barthel, R Buchner
Measurements of the relative electric permittivity (dielectric constant or relative permittivity) e(p,T) and refractive index of fluids n(p,T) as a function of the pressure and the temperature can be used to determine a wide range of thermodynamic

Security for Wireless Networks and Devices

March 27, 2003
Author(s)
Shirley M. Radack
This ITL Bulletin summarizes NIST Special Publication (SP) 800-48, Wireless Network Security, 802.11, Bluetooth, and Handheld Devices. Written by Tom Karygiannis and Les Owens. NIST SP 800-48 provides recommendations to improve the security of wireless

Decoherence of a Superconducting Qubit due to Bias Noise

March 25, 2003
Author(s)
John M. Martinis, Sae Woo Nam, Joe Aumentado, Kristine Lang, C Urbina
We calculate for the current-biased Josephson junction the decoherence of the qubit state from noise and dissipation. The effect of dissipation can be entirely accounted for through a noise model of the current bias that appropriately includes the effect

Modification of Thin Film Phase Separation by a Surfactant

March 25, 2003
Author(s)
Li Piin Sung, Alamgir Karim, Jack F. Douglas, Charles C. Han
Phase separation in thin films leads to the formation of surface patterns (holes, bumps, and bicontinuous surface features) which depend on the film composition. These features are interpreted to arise from surface tension variations within the film that

Post-Measurement Nonlocal Gates

March 24, 2003
Author(s)
David Song
Several proposed quantum computer models include measurement processes, in order to implement nonlocal gates and create necessary entanglement resources during the computation. We introduce a scheme in which the measurements can be delayed for two- and

Thermal Decomposition of 2-Bromopropene, and 2-Chloropropene

March 24, 2003
Author(s)
K Roy, Iftikhar A. Awan, Jeffrey A. Manion, Wing Tsang
2-Chloropropene and 2-bromopropene have been decomposed in single pulse shock tube experiments. The only products under all conditions are propyne and allene. The high pressure rate expressions arek(2-BrC 3H 5 => propyne/allene + HBr) =10 14.12 exp(-3283OK

Fundamental Noise Limitations to Supercontinuum Generation in Microstructure Fiber

March 21, 2003
Author(s)
Kristan L. Corwin, Nathan R. Newbury, J M. Dudley, S. Coen, Scott Diddams, K Weber, R Windeler
Broadband noise on supercontinuum spectra generated in microstructure fiber is shown to lead to amplitude fluctuations as large as 50% for certain input laser pulse parameters. We study this noise using both experimental measurements and numerical

Recognizing Small Circuit Structure in Two-Qubit Operators

March 20, 2003
Author(s)
V V. Shende, Stephen Bullock, I L. Markov
This work describes numerical tests which determine whether a two-qubit quantum computation has an atypically simple quantum circuit. Specifically, we describe forumulae, written in terms of matrix coefficients, characterizing operators implementable with

Smaller Two-Qubit Circuits for Quantum Communication and Computation

March 20, 2003
Author(s)
V V. Shende, I L. Markov, Stephen Bullock
We show how to implement an arbitrary two-qubit unitary operation using any of several quantum gate libraries with small a priori upper bounds on gate counts.Using quantum circuit identities, we improve an earlier lower bound of 17 elementary gates by

Simulating Fire Dynamics and the Thermal Response of Structural Elements

March 19, 2003
Author(s)
Kuldeep R. Prasad, Howard R. Baum
Simulations of the effects of severe fires on the structural integrity of building requires a close coupling between the gas phase energy release and transport phenomena and the stress analysis in the load bearing materials. The connection between the two

Soot Inception in a Well Stirred Reactor

March 19, 2003
Author(s)
L G. Blevins, K A. Jensen, R A. Ristau, N Y. Yang, C W. Frayne, R C. Striebich, M J. DeWitt, S D. Stouffer, E J. Lee, Robert A. Fletcher, J M. Oran, Joseph M. Conny, George W. Mulholland
Soot samples collected from a well stirred reactor operating with ethylene/air equivalence ratios of 1.9, 2.0, and 2.1 were examined to determine yield, size distribution, morphology, and composition. For F = 1.9, particles are absent. For F = 2.0 and 2.1

Arabidopsis Thaliana Ogg1 Protein Excises 8-Hydroxyguanine and 2,6- Diamino-4-hydroxy-5-formamidopyrimidine from Oxidative Damaged DNA Containing Multiple Lesions

March 18, 2003
Author(s)
T Morales-Ruiz, M Birincioglu, Pawel Jaruga, H Rodriguez, T. Roldan-Arjona, Miral M. Dizdar
A functional homologue of eukaryotic Ogg1 proteins in the model plant Arabidopsis thaliana has recently been cloned, isolated, and characterized [Garcia-Ortiz, M.V., Ariza, R.R., and Roldan-Arjona, T. (2001) Plant Mol. Biol. 47, 795-804]. This enzyme

Terrain Characterization from Ground-Based LADAR

March 17, 2003
Author(s)
Christoph J. Witzgall, Geraldine S. Cheok, David E. Gilsinn
Test runs of Army Research Laboratory s (ARL) autonomous vehicle (Experimental Unmanned Vehicle, XUV) were followed by the acquisition of high resolution scans of selected regions of the test course. These scans were used to i) determine terrain features

Current-Induced Spin-Wave Excitations in a Single Ferromagnetic Layer

March 14, 2003
Author(s)
Yi Ji, C Chien, Mark D. Stiles
Evidence for a current induced spin-transfer torque effect has been investigated in a series of point contacts to single ferromagnetic layers. At specific current densities, abrupt resistance changes, similar to those attributed to current-induced spin

Temperature-Controlled MEMS Chemical Microsensors

March 13, 2003
Author(s)
Stephen Semancik, Richard E. Cavicchi, Douglas C. Meier, C J. Taylor, N O. Savage, M C. Wheeler
This paper describes MEMS microheater structures that have been employed in the development of chemical (gas) microsensors and other microanalytical components, such as preconcentrators and filters/separators. The role of microscale temperature control is

Separating Signal From Noise in Global Warming

March 12, 2003
Author(s)
Bert W. Rust
One argument often used against global warming is that the global temperature record is too noisy to allow a clear determination of the signal. This paper presents two models for the signal which suggest that: (1) the warming is accelerating, (2) the

Energy Consumption Measurements Using AHAM HRF-1 and ISO 8561

March 10, 2003
Author(s)
David A. Yashar
This investigation compares the energy consumption ratings obtained for refrigerators using the Association of Home Appliance Manufacturers (AHAM) HRF-1 test procedure, as adopted by the United States Department of Energy (DOE), and the International
Displaying 41176 - 41200 of 73697
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