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Displaying 40176 - 40200 of 73960

Knowledge Engineering for Real Time Intelligent Control

December 31, 2003
Author(s)
Elena R. Messina, James S. Albus, Craig I. Schlenoff, J L. Evans
The key to real-time intelligent control lies in the knowledge models that the system contains. We argue that there needs to be a more rigorous approach to engineering the knowledge within intelligent controllers. Three main classes of knowledge are

Accurate control of Josephson phase qubits

December 30, 2003
Author(s)
Matthias Steffen, John M. Martinis, Isaac C. Chuang
A quantum bit is a closed two-dimensional Hilbert space, but often experimental systems have three or more energy levels. In a Josephson phase qubit the energy differences between successive levels differ by only a few percent, and hence care must be taken

Improving the Sensitivity of Electron Beam Microanalytical Techniques by Enhanced X-Ray Spectrometry: X-Ray Microcalorimetry, Silicon Drift Detector Energy Dispersive X-ray Spectrometry, and Polycapillary X-ray Optics

December 25, 2003
Author(s)
Dale E. Newbury
The microcalorimeter energy dispersive x-ray spectrometer, the silicon drift detector (SDD), and polycapillary x-ray optics are recent developments that have significantly advanced analytical x-ray spectrometry for electron beam instruments. The

Development and Characterization of a TES Optical Imaging Array for Astrophysics Applications

December 20, 2003
Author(s)
J. Burney, T. Bay, P. Brink, B. Cabrera, J. P. Castle, R. W. Romani, A. Tomada, Sae Woo Nam, Aaron J. Miller, John M. Martinis, E. Wang, T. Kenny, B. A. Young
Our research group has successfully developed photon detectors capable of both time-stamping and energy-resolving individual photons at very high rates in a wide band from near IR through optical and into near UV. We have currently fabricated 32-pixel

Near Unity Absorption in Tungsten films

December 19, 2003
Author(s)
Danna Rosenberg, Sae Woo Nam, Aaron J. Miller, Arto Salminen, Erich N. Grossman, Robert E. Schwall, John M. Martinis
The number resolving ability and extremely low dark count rate of tungsten transition-edge sensors (TESs) make them excellent candidates to replace avalanche photo diodes (APDs) in quantum information experiments, including quantum key distribution and

Dilute Al-Mn alloys for superconductor device applications

December 17, 2003
Author(s)
Steve Ruggiero, Anthony Williams, W. H. Rippard, A. Clarke, Steven Deiker, Leila R. Vale, Joel N. Ullom
We discuss results on the superconducting and electron-transport properties of Mn doped Al produced by sputter deposition. The critical temperature of Al has been systematically reduced to below 50 mK by doping with 1000-3000 ppm Mn. Values of the α

Suppression of excess noise in transition-edge sensors using magnetic field and geometry

December 17, 2003
Author(s)
Joel N. Ullom, William B. Doriese, Gene C. Hilton, James A. Beall, Steven Deiker, Kent D. Irwin, Carl D. Reintsema, Leila R. Vale, Yizi Xu
We report recent progress at NIST on Mo/Cu Transition-Edge Sensors (TESs). While the signal- band noise of our sensors agrees with theory, we observe excess high-frequency noise. We describe this noise and demonstrate that it can be heavily suppressed by a

The Advanced Technology Solar Spectroscopic Imager (ATSSI) - a Novel Experiment Employing a Transition-Edge Sensor to Probe the Soft X-Ray Solar Corona

December 17, 2003
Author(s)
P F. Boerner, D S. Martinez-Galarce, K Wamba, B. Cabrera, Steven Deiker, Kent D. Irwin, T W. Barbee, P F. Baker
The Advanced Technology Solar Spectroscopic Imager (ATSSI) is a sounding rocket-borne experiment that will employ a Transition-Edge Sensor (TES) placed at the focus of a Wolter-I mirror to study large active region loops in the solar corona. The TES

Direct observation of photon pairs at a single output port of a beam-splitter interferometer

December 16, 2003
Author(s)
Matthew Shaw, Giovanni Di Giuseppe, A. Sergeinko, Bahaa E. A. Saleh, Malvin C. Teich, Aaron J. Miller, Sae Woo Nam
The seminal experiment carried out by Hong, Ou, and Mandel some fifteen years ago is one of the most important in the annals of quantum optics. This experiment demonstrated that two indistinguishable photons incident on a simple beam splitter interfere in

INVESTIGATION OF NANODISPERSION IN POLYSTYRENE -MONTMORILLONITE NANOCOMPOSITES BY SOLID STATE NMR

December 15, 2003
Author(s)
S Bourbigot, Jeffrey W. Gilman, David L. VanderHart, W H. Awad, Rick D. Davis, A B. Morgan, C A. Wilkie
Nanocomposites result from combinations of materials with vastly different properties at the nanometer scale. These materials exhibit many unique properties, such as improved thermal stability, reduced flammability, and improved mechanical properties. Many

Nanometrology - FY 2003 Program and Selected Accomplishments

December 15, 2003
Author(s)
Clare M. Allocca, Stephen W. Freiman
The emphasis on nanotechnology around the world is leading to the development and commercialization of unique products based upon significantly smaller devices and material ensembles. Materials at the nanoscale in three dimensions (NEMS, MEMS), two

Government/Industry Interactions in the Global Standards System

December 11, 2003
Author(s)
Roger Marks, Robert E. Hebner
We review the evolution of the global standards system and its relationship to industry. We then discuss some of the approaches that governments have taken in order to modify the system for the benefit of domestic and worldwide economic development. We use

Molecular Devices formed by Direct Monolayer Attachment to Silicon

December 10, 2003
Author(s)
Curt A. Richter, Christina A. Hacker, Lee J. Richter
We present the results of studies of solution-based attachment of long-chain aliphatic molecules to hydrogen-terminated Si surfaces formed to pursue the electrical properties of organic monolayers and as a first step towards creating hybrid silicon

Report of the 88th National Conference on Weights and Measures

December 9, 2003
Author(s)
Linda D. Crown, K M. Dresser, Steven E. Cook, Juana S. Williams, R C. Suiter, L T. Sebring, H V. Oppermann
The 88th Annual Meeting of the National Conference on Weights and Measures (NCWM) was held July 13 through 17, 2003, at the John Ascuaga s Nugget Hotel in Sparks, NV. The theme of the meeting was, Moving Strategically into the Future. Reports by the NCWM

Correcting For Systematic Errors In One-Port Calibration-Standards

December 5, 2003
Author(s)
John R. Juroshek, Denis X. LeGolvan
This paper describes how to correct for systematic errors in one-port vector network analyzer calibrations that are caused by modeling errors in the one-port calibration standards. The paper shows how to correct an open-short-load calibration that was made

Design and Characterization of a Superconducting Nonlinear Reference Device

December 5, 2003
Author(s)
James Booth, Kenneth Leong, Susan A. Schima, Jeffrey Jargon, Donald C. DeGroot
Abstract ' We describe the design, fabrication, and testing of a nonlinear reference device that has a calculable phase relationship between the fundamental signal and higher harmonic signals in the microwave range. Such a device would be useful for
Displaying 40176 - 40200 of 73960
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