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Displaying 42526 - 42550 of 73960

Stacked Nanoscale Josephson Junction Arrays for High-Performance Voltage Standards

December 4, 2002
Author(s)
Samuel Benz, Paul Dresselhaus, Yonuk Chong, Charles J. Burroughs
Superconducting Josephson voltage standard systems have replaced electrochemical cell (battery-like) artifact standards for voltage metrology because quantum-based systems produce precise and accurate voltages independent of any material parameters. The

Impedance/Dielectric Spectroscopy of Electroceramics in the Nanograin Regime

December 3, 2002
Author(s)
N Kidner, Z J. Homrighaus, B J. Ingram, T Mason, Edward Garboczi
In the microcrystalline regime, the behavior of grain boundary-controlled electroceramics is well described by the brick layer model (BLM). In the nanocrystalline regime, however, grain boundary layers can represent a significant volume fraction of the

A Framework for Standard Modular Simulation

December 1, 2002
Author(s)
Charles R. McLean, Swee K. Leong
The primary reason for building manufacturing simulations is to provide support tools that aid the manufacturing deci-sion-making process. Simulations are typically a part of a case study commissioned by manufacturing management to address a particular set

A Monolithic CMOS Microhotplate-based Gas Sensor System

December 1, 2002
Author(s)
Muhammad Afridi, John S. Suehle, Mona E. Zaghloul, David W. Berning, Allen R. Hefner Jr., Richard E. Cavicchi, Stephen Semancik, C B. Montgomery, C J. Taylor
A monolithic CMOS microhotplate-based conductance type gas sensor system is described. A bulk micromachining technique is used to create suspended microhotplate structures. The thermal properties of the microhotplates include a one-millisecond thermal time

Advances in Materials and Mechanics

December 1, 2002
Author(s)
K P. Chong, Mark R. VanLandingham, Li Piin Sung
Mechanics and materials are essential elements in all of the transcendent technologies that are the primary drivers of the twenty first century and in the new economy. The transcendent technologies include nanotechnology, microelectronics, information

Advances in Wireless Networking Standards

December 1, 2002
Author(s)
Roger Marks
This paper describes air interface standards for wireless local area network (LAN), wireless metropolitan area network (MAN), and wireless personal area network (PAN) technology being developed within the IEEE 802 LAN MAN Standards Committee of the

Advisability of Human Life Span Extension: Economic Considerations

December 1, 2002
Author(s)
H Rodriguez, D A. Banks
Enormous gains in biomedical technology have occurred since the 1960s. This has led to great advances in treatment methodology, as well as enhanced diagnostic ability for physicians. Surgeons now routinely perform procedures thought impossible 40 years ago

Amorphous Solidification in Polymer-Platelet Nanocomposites

December 1, 2002
Author(s)
S Salaniwal, S K. Kumar, Jack F. Douglas
Computer simulations are used to understand the molecular basis of mechanical reinforcement of platelet-filled polymers when the polymer and nanofiller interact attractively. With decreasing temperature, there is increasing aggregation between chains and

Application of the V-Notch Shear Testing for Unidirectional Hybrid Composities

December 1, 2002
Author(s)
J He, Martin Y. Chiang, Donald L. Hunston, Charles C. Han
The v-notch (losipescu) shear test was investigated as a mean for determining the in-plane shear modulus and strength of unidirectional hybrid composites. Two types of hybrid systems having different fiber tow volume fractions composed of carbon and glass

Assisting Functional Assignment for Hypothetical Heamophilus Influenzae Gene Products Through Structural Genomics

December 1, 2002
Author(s)
G L. Gilliland, Jane E. Ladner, Prasad T. Reddy, A Teplyakov, G Obmolova, M Tordova, O Herzberg, Kap Lim, H. Zhang, K Huang, Z Li, A Tempczyk, W Kajewski, L Parsons, D C. Yeh, J Orban, Edward Eisenstein, J F. Parsons, N Bonander, K E. Fisher, J Toedt, E Melamud, J Moult, N Thanki, A J. Howard
The three-dimensional structures of Haemophilus influenzae proteins with completely unknown function are being determined as part of a structural genomics project. This effort is investigating the use of structural information in assisting protein

Brewster-Angle Attenuator for THz Pulses

December 1, 2002
Author(s)
A G. VanEngen Spivey, S T. Cundiff
A variable attenuator for terahertz (THz) pulses is developed on the based of the change in reflectivity of lithium niobate wafers with incident angle in a Brewster configuration. We can vary the THz field transmission from 22% to 54%, a change of a factor

Cavitation of Polyethylene During Extrusion Processing Instabilities

December 1, 2002
Author(s)
Y Son, Kalman D. Migler
We present observations of cavitation that occur inside a capillary die during extrusion of a polyethylene. This phenomenon is observed over the last 1.5 mm of the capillary tube immediately upstream of the exit. We observe spontaneous formation of voids
Displaying 42526 - 42550 of 73960
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