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Displaying 28801 - 28825 of 74348

Optimization Calculations for a 30 HZ, 4 K Regenerator with Helium-3 Working Fluid

June 28, 2009
Author(s)
Ray Radebaugh, Yonghua Huang, Agnes A. O'Gallagher, John M. Gary
The NIST numerical software, REGEN3.3, which incorporates both He-4 and He-3 properties, was used to calculate the losses and second law efficiencies of 4 K regenerators operating at 30 Hz. Operating parameters, such as average pressure, pressure ratio

Silicon Carbide Nanostructures: A Tight Binding Approach

June 28, 2009
Author(s)
Anthony D. Patrick, Xiao Dong, Thomas C. Allison, Estela Blaisten-Barojas
A tight-binding model Hamiltonian is newly parametrized for silicon carbide based on fits to a database of energy points calculated within the density functional theory approach of the electronic energy surfaces of nanoclusters and the total energy of bulk

A Volcano Curve: Optimizing Methanol Electro-oxidation on Pt decorated Ru Nanoparticles

June 26, 2009
Author(s)
Christopher D. Zangmeister, Savelas A. Rabb, Du Bingchen, YuYe Tong
Controlled Pt adlayers were deposited on commercial Ru nanoparticles (NPs) using an industrially scalable one-pot ethylene glycol (EG) reduction based method and were characterized by X-ray diffraction (XRD), electrochemical (EC) CO stripping voltammetry

Lateral variations in self-assembled InGaAs quantum dot distributions

June 26, 2009
Author(s)
Alexana Roshko, Todd E. Harvey, Brittany L. Hyland, Lehman Y. Susan, Keith D. Cobry
The lateral uniformity of self-assembled InGaAs quantum dots grown by molecular beam epitaxy(MBE) was assessed as a function of growth conditions. Variations in the dot density and height were determined from atomic force micrographs. Growth rate had a

Thermometry Issues in Destruction Kinetics Measurements

June 26, 2009
Author(s)
Dean C. Ripple
Of all the aspects of destruction kinetics measurement, the one taken most for granted is temperature measurement. The ubiquity of digital thermometers and their ease of use have disguised potential accuracy issues in the range of temperature encountered

Experimental Uhrig Dynamical Decoupling Using Trapped Ions

June 25, 2009
Author(s)
Michael J. Biercuk, Hermann Uys, Aaron Vandevender, Nobuyasu Shiga, Wayne M. Itano, John J. Bollinger
We present a detailed experimental study of the Uhrig Dynamical Decoupling (UDD) sequence in a variety of noise environments. Our qubit system consists of a crystalline array of 9Be + ions confined in a Penning trap. We use an electron-spin-flip transition

Three-Dimensionally Structured CdTe Thin Film Photovoltaic Devices with Self-Aligned Back Contacts: Electrodeposition on Interdigitated Electrodes.

June 25, 2009
Author(s)
Daniel Josell, Carlos R. Beauchamp, Suyong S. Jung, Behrang H. Hamadani, Abhishek Motayed, Lee J. Richter, Maureen E. Williams, John E. Bonevich, Alexander J. Shapiro, Nikolai B. Zhitenev, Thomas P. Moffat
Cadmium-telluride photovoltaic cells were deposited on substrates patterned with two interdigitated electrodes. Deposition involved application of different potentials to the two electrodes in order to obtain a 3-d gradient of film properties within the

Isolation, Purification, and Full NMR Assignments of cyclopamine from Veratrum californicum

June 24, 2009
Author(s)
Daniel W. Bearden, John E. Oatis, Pam Brunsfeld, James W. Rushing, Peter D. Moeller, Thomas N. Gallien, George W. Cooper
The Hedgehog (Hh) signaling pathway is essential for embryogenesis and tissue homeostasis in the adult. However, it may also induce malignancies in a number of tissues when constitutively activated, and it also may have a role in other forms of normal and

Security for Enterprise Telework and Remote Access Solutions

June 24, 2009
Author(s)
Karen A. Scarfone
Many people telework (also known as telecommuting), which is the ability for an organization s employees and contractors to perform work from locations other than the organization s facilities. Teleworkers use various client devices, such as desktop and

CYCLE D Version 4.0: Theoretical Vapor Compression Cycle Design Program

June 23, 2009
Author(s)
J S. Brown, Piotr A. Domanski
This paper presents Version 4.0 of the CYCLE_D: NIST Vapor Compression Cycle Design Program. The model can simulate a basic subcritical or transcritical refrigeration cycle, both with or without a liquidline/ suction-line heat exchanger. In addition, the

CYCLE_D: NIST Vapor Compression Cycle Design Program Version 4.0 Users' Guide

June 23, 2009
Author(s)
J S. Brown, Piotr A. Domanski, Eric Lemmon
The CYCLE_D package simulates vapor compression refrigeration cycles that use pure refrigerants or mixtures of refrigerants. The model can simulate a basic subcritical or transcritical refrigeration cycle, both with or without a liquid-line/suction-line

Viscosity and Density of CuO Nanolubricant

June 23, 2009
Author(s)
Mark A. Kedzierski
This paper presents liquid kinematic viscosity and density measurements of a synthetic polyolester based copper (II) oxide (CuO) nanoparticle dispersion (nanolubricant) at atmospheric pressure for a temperature range from approximately 288 K to 318 K. The

Inter-Laboratory Comparisons of NbTi Critical Current Measurements

June 22, 2009
Author(s)
Arno Godeke, D. Turrioni, T. Boutboul, Najib Cheggour, A. K. Ghosh, Loren F. Goodrich, M Meinesz, A. den Ouden
We report on a multi-institute comparison of critical current data, measured on a modern Large Hadron Collider (LHC) NbTi wire that has shown a standard deviation below 1% in critical current density spread in more than 1500 measurements. Inter-laboratory

Internal tin Nb3Sn conductors engineered for fusion and particle accelerator applications

June 22, 2009
Author(s)
Jeffrey Parrell, Y. Zhang, Michael Field, M Meinesz, Yonghua Huang, H Miao, Seungok Hong, Najib Cheggour, Loren F. Goodrich
The critical current density (Jc) of Nb3Sn strand has been significantly improved over the last several years. For most magnet applications, high Jc internal tin has displaced bronze process strand. The highest Jc values are obtained from distributed

Microfluidic Mixer for Polymer Melts

June 22, 2009
Author(s)
Doyoung Moon, Kalman D. Migler
We present a novel microfluidic mixer for high temperature polymer melts based on the platform of the Multi-sample Micro-slit Rheometer (MMR). The device is essentially a static mixer with eight consecutive units of splitting and recombination flow formed

Novel nano-structured Metal-Semiconductor-Metal photodetector with high peak voltage

June 22, 2009
Author(s)
Paul D. Hale, Dylan F. Williams, Tomoko Borsa, B. J. VanZeghbroeck
A novel nano-structured metal-semiconductor-metal photodetector consisting of interdigitated metal fingers and nanodots is successfully fabricated on a semi-insulating GaAs substrate by electron beam lithography, and integrated with an on-chip ground

Static Analysis Tool Exposition (SATE) 2008

June 22, 2009
Author(s)
Vadim Okun, Romain Gaucher, Paul E. Black
The NIST SAMATE project conducted the first Static Analysis Tool Exposition (SATE) in 2008 to advance research in static analysis tools that find security defects in source code. The main goals of SATE were to enable empirical research based on large test

Test Results of the First US ITER TF Conductor in SULTAN

June 22, 2009
Author(s)
Nicolai N. Martovetsky, Daniel R. Hatfield, John R. Miller, Chen-yu Gung, Joel S. Schultz, Najib Cheggour, Loren F. Goodrich, Pierluigi Bruzzone, Boris Stepanov, Rainer Wesche, Bernd Seeber
The US Domestic Agency is one of six parties supplying TF cable-in-conduit conductors (CICCs) for ITER. Previous tests have shown that measured performance of the TF CICCs can be much lower than expected from the strand properties at the projected uniaxial

DESIGN, FABRICATION, AND ASSEMBLY OF A HOLLOW-CORE FIBER-BASED MICRO CRYOGENIC COOLER

June 21, 2009
Author(s)
James C. Booth, Mu Hong Lin, Peter E. Bradley, H.-j Wu, Ray Radebaugh, Y.C. Lee
One of the smallest Joule Thomson (J-T) micro cryogenic coolers (MCC) utilizing a hollow-core fiberbased heat exchanger (HX) is designed, fabricated, assembled and tested. Techniques that control mask material etching are developed to fabricate a multi

Atomic layer deposition enabled interconnect technology for vertical nanowire array devices

June 20, 2009
Author(s)
Myongjai Lee, Jen-Hau Cheng, Kristine A. Bertness, Norman Sanford, Dragos Seghete, Steven M. George, Y.C. Lee
We have demonstrated an atomic layer deposition (ALD) enabled interconnect technology for vertical, c-axis oriented gallium nitride (GaN) nanowire (NW, 5-10m in length, 80-200nm in diameter) arrays encapsulated by benzocyclobutene (BCB). The nano-scaled
Displaying 28801 - 28825 of 74348
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