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Displaying 36426 - 36450 of 73697

Effect of Conduit Material on CICC Performance Under High Cycling Loads

June 1, 2005
Author(s)
Nicolai N. Martovetsky, Pierluigi Bruzzone, Boris Stepanov, Rainer Wesche, Chen-yu Gung, J V. Minervini, M Takayasu, Loren F. Goodrich, John (Jack) W. Ekin, Arend Nijhuis
Recent International Thermonuclear Experimental Reactor (ITER) Model Coils and tests on Nb 3Sn Cable in Conduit Conductors (CICC) showed a significant and unexpected increase in the broadness of the transition to the normal state, resulting in degradation

Exchanging Technical Product Data, The Story of ISO TC 184/SC4

June 1, 2005
Author(s)
Sharon J. Kemmerer
Developing exchange standards for technical product data started historically as multiple, and isolated, national efforts in the 1970s and early 80s. The industrial domain leading the way in the 70s was primarily the transportation sector (automotive and

Fabrication and Measurement of Tall Stacked Arrays of SNS Josephson Junctions

June 1, 2005
Author(s)
Nicolas Hadacek, Paul Dresselhaus, Yonuk Chong, Samuel Benz, John E. Bonevich
We have made tall, uniform stacked Josephson junction arrays by developing an etch process using an inductively coupled plasma etcher. This process produces vertical profiles in thin-film multilayers of alternating superconducting and normal metals. Such a

First-Order Raman Spectra of AB' 1/2 B'' 1/2 O 3 Double Perovskites

June 1, 2005
Author(s)
S A. Prosandeev, U Waghmare, Igor Levin, James E. Maslar
First principles computations of Raman intensities were performed for perovskite-like compound CaAl1/2Nb1/2O3 (CAN). This compound features 1:1 (NaCl-type) ordering of Al and Nb superimposed onto the b-b-c+ octahedral tilting. Raman tensor for CAN was

Flexible Cryo-packages for Josephson Devices

June 1, 2005
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus, Yonuk Chong, Hirotake Yamamori
We have developed a method of bonding superconductive integrated-circuit chips to interchangeable, microwave-compatible, flexible cryo-packages. This new 'flip-chip on flex' technology will greatly improve the service life and reliability of our Josephson

High-Temperature Guarded Hot Plate Apparatus Control of Edge Heat Loss

June 1, 2005
Author(s)
Daniel R. Flynn, William M. Healy, Robert R. Zarr
The guarded hot plate (GHP) apparatus is the most common type of absolute apparatus for measurement of the thermal transmission properties of thermal insulation. As the name implies, the hot meter plate is surrounded by a coplanar guard plate, separated by

High-Temperature Guarded Hot Plate Apparatus Optimal Locations of Circular Heaters

June 1, 2005
Author(s)
Daniel R. Flynn, William M. Healy, Robert R. Zarr
The National Bureau of Standards (now the National Institute of Standards and Technology (NIST)) pioneered the use of circular line-heat-sources in guarded hot plate (GHP) apparatus, the most common type of absolute apparatus for measurement of the thermal

Intercomparison Program for Organic Speciation in PM2.5 Air Particulate Matter: Description and Results for Trials I and II; Materials: Air Particulate Extract I, Air Particulate I, and PM2.5 Interim RM

June 1, 2005
Author(s)
Michele M. Schantz, Stephen A. Wise, J Lewtas
A working group of investigators, who are characterizing and quantifying the organic compounds in particulate matter (PM) as part of the US EPA s PM 2.5 research program and related studies, was established to advance the quality and comparability of data

IPv4 Prefix Options for DHCPv6

June 1, 2005
Author(s)
M K. Shin
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

Low Phase Noise Amplifier and Oscillator Using Feed-Forward Technique at 10 GHz

June 1, 2005
Author(s)
Archita Hati, Craig W. Nelson, David A. Howe
We discuss the performance of a feed-forward amplifier (FFA) at 10GHz. The feed-forward method is primarily used to suppress intermodulation distortion in amplifiers to suppress up-converted near-DC noise. The main amplifier in this configuration is a low

Mass Flow Rate of R-410A Through Short Tubes Working Near the Critical Point

June 1, 2005
Author(s)
Y Kim, William V. Payne, John Choi, Piotr A. Domanski
Experimental data were taken to examine R-410A mass flow rate characteristics through short tube restrictors at upstream pressures approaching the critical point. Four short tube restrictors were tested by varying upstream pressure from 2619 kPa to 4551

Measurements & modeling of phonon cooling by electron-tunneling refrigerators

June 1, 2005
Author(s)
Nathan A. Tomlin, A. M. Clark, Anthony Williams, Steve Ruggiero, Gene C. Hilton, James A. Beall, Kent D. Irwin, Leila R. Vale, Joel Ullom
We demonstrate cooling of the electrons and phonons of a silicon nitride Si-N membrane by solid-state refrigerators based on Normal-metal/Insulator/Superconductor (NIS) tunnel junctions. We report a temperature reduction of the Si-N membrane from 260 mK to

Miniature Piezoceramic Actuators with Improved Fatigue Resistance

June 1, 2005
Author(s)
Stephanie A. Hooker, Jens Mueller, Clayton Kostelecky, K. Womer
Piezoelectric ceramics are desirable actuator materials for many biomedical applications due to their ability to generate precise, controlled motion with applied voltage. Herein, we report the fabrication of miniature piezoelectric ceramic actuators and

Modeling Solid Sample Burning With FDS

June 1, 2005
Author(s)
Gregory T. Linteris, L W. Gewuerz, Kevin B. McGrattan, Glenn P. Forney
Black PMMA was burned in the cone calorimeter in two orientations (horizontal and vertical), at imposed radiant heat fluxes of (0, 5, 10, 25, 50, and 75) kW/m2, and the visual appearance, flame size, heat release rate, and mass loss rate were recorded
Displaying 36426 - 36450 of 73697
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