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Displaying 38826 - 38850 of 73829

Double-stacked MoSi2-barrier junctions for programmable Josephson voltage standards

June 1, 2004
Author(s)
Yonuk Chong, Charles J. Burroughs, Paul D. Dresselhaus, Nicolas Hadacek, Hirotake Yamamori, Samuel P. Benz
We are developing MoSi2-barrier stacked junction arrays for Josephson voltage standards in order to increase the output voltage, operating bandwidth, and operating margins. In this paper we present results of a programmable voltage standard circuit with

Effect of Sandblasting on the Long-Term Performance of Dental Ceramics

June 1, 2004
Author(s)
Yu Zhang, Brian R. Lawn, E D. Rekow, Victoria Thompson
A study is made of the effects of sandblasting on the strength of Y-TZP and alumina ceramic layers joined to polymeric substrates and loaded at the top surfaces by a spherical indenter, in simulation of occlusal contact in ceramic crowns on tooth dentin

Effect of Target and Probe Concentrations on Hybridization in DNA Microarrays

June 1, 2004
Author(s)
Lili Wang, Adolfas K. Gaigalas, Y Zong, S Zhang, J Shi, Yunda Wang
Efficient hybridization of complementary strands of DNA is the underlying principle of all microarray-based techniques for gene expression analysis. Recently studies have been published to assess oligonucleotide (55-70 bases) performance on glass-slide

Electron Self-Energy for Higher Excited S Levels

June 1, 2004
Author(s)
U Jentschura, Peter J. Mohr
We present results for the third perturbation coefficient of the self-energy correction to many energy levels of hydrogenlike systems(states with principal quantum number n

Fault Classes and Fault Coupling in Boolean Specifications

June 1, 2004
Author(s)
Vadim Okun, Paul E. Black, Y Yesha
ult-based testing strategies generate tests to detect faults belonging to a preselected set of simple fault classes. A hierarchy of fault classes and the infrequency of fault coupling let us rely on these strategies to detect many other faults, too.For

Ferromagnetic Resonance Linewidth Models for Perpendicular Media

June 1, 2004
Author(s)
Robert D. McMichael
Ferromagnetic resonance linewidth in pendicular recording media is modeled with inhomogeneous uniaxial anisotropy field H u and with tilting of the easy axes from the film normal. The linewidth is calculated using both a local resonance model and a

Flat-Spot Measurements for an AC Josephson Voltage Standard

June 1, 2004
Author(s)
Charles J. Burroughs, Samuel P. Benz, Paul D. Dresselhaus, Yonuk Chong
Recent advances in circuit design and fabrication of superconducting integrated circuits have enabled us to demonstrate for the first time an ac Josephson voltage standard (ACJVS) that generates both ac and dc waveforms up to 242 mV peak voltage. Using a

Frequency Uncertainty Analysis for Josephson Voltage Standard

June 1, 2004
Author(s)
Yi-hua D. Tang, Michael A. Lombardi, David A. Howe
The uncertainty in voltage measurement in a Josephson voltage standard (JVS) is proportional to the uncertainty of frequency measurement. The 10 MHz time-base from various commonly used frequency standards for JVS are analyzed using Allan variance to

Interfacial Effects on Moisture Absorption in Thin Polymer Films

June 1, 2004
Author(s)
B D. Vogt, Christopher L. Soles, Ronald L. Jones, C M. Wang, Eric K. Lin, Wen-Li Wu, Sushil K. Satija, D L. Goldfarb, M Angelopoulos
Moisture absorption in model photoresist films of poly(4-hydroxystryene) (PHOSt) and poly(tert-butoxycarboxystyrene) (PBOCSt) was measured by x-ray and neutron reflectivity. The degree of swelling in the films upon moisture exposure was found to be

International Association of Chemical Thermodynamics (IACT) web site

June 1, 2004
Author(s)
Marilyn R. Yetzbacher, Lorene R. Celano
IACT (the International Association of Chemical Thermodynamics) continues and expands the work of the former IUPAC Commission on Chemical Thermodynamics in establishing the highest standards in thermodynamics research and routine thermodynamic property

Investigations of Noise in Measurements of Electronic Voltage Standards

June 1, 2004
Author(s)
Thomas J. Witt, Yi-hua D. Tang
We have studied the voltage noise of electronic voltage standards based on Zener diode references (Zeners). Ten volt Zener outputs were compared to NIST Josephson standards using a DVM to record voltage differences. The data were analyzed using the Allan

Johnson Noise Thermometry Using a Quantum Voltage Noise Source for Calibration

June 1, 2004
Author(s)
Sae Woo Nam, Samuel P. Benz, Paul D. Dresselhaus, Weston L. Tew, D. R. White, John M. Martinis
We describe our progress towards a high-precision measurement of temperature using Johnson noise. Using a Quantized Voltage Noise Source (QVNS) based on the Josephson effect as a calibrated noise source, we have been able to measure the gallium and water

Local and Global Control Mechanisms in Allosteric Threonine Deaminase

June 1, 2004
Author(s)
David T. Gallagher, D Chinchilla, Herbert Lau, Edward Eisenstein
Allosteric and cooperative control signals were investigated in the tetrameric enzyme threonine deaminase. The tetramer consists of two dimers that associate at the x dyad. The structure pointed the way to use the Q175E mutation to create hybrid tetramers

Materials Design in the Performance of All-Ceramic Crowns

June 1, 2004
Author(s)
Brian R. Lawn, Antonia Pajares, Yu Zhang, Y N. Deng, M Polack, Isabel K. Lloyd, E D. Rekow, Victoria Thompson
Results from a systematic study of damage in material structures representing the basic elements of dental crowns are reported. Tests are made on model flat-layer specimens fabricated from various dental ceramic combinations bonded to dentin-like polymer
Displaying 38826 - 38850 of 73829
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