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Displaying 42626 - 42650 of 74053

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

Chain Conformation in Ultrathin Polymer Films

December 1, 2002
Author(s)
Ronald L. Jones, Christopher Soles, Francis W. Starr, Eric K. Lin, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Wen-Li Wu, D L. Goldfarb, M Angelopolous
Using Small Angle Neutron Scattering (SANS), we present the first quantitative measurements of the 3-dimensional conformation of macromolecules in thin polymer films of D RG,Bulk. Where D is the film thickness and RG,Bulk is the bulk radius of gyration

Characterisation of the Response of Chromium-Doped Alumina Screens in the Vacuum Ultraviolet Using Synchrotron Radiation

December 1, 2002
Author(s)
James K. McCarthy, A Baciero, B Zurro, Uwe Arp, Charles Tarrio, Thomas B. Lucatorto, A Morono, P Martin, E R. Hodgson
We have measured the response of chromium-doped alumina screens to vacuum ultraviolet radiation and derived quantum efficiency curves for the energy range from 30 to 300 eV. A model is presented to explain the structure in this curve. In addition, the

Copper Oxide Precipitates in NBS Standard Reference Material 482

December 1, 2002
Author(s)
Eric S. Windsor, R Carlton, John G. Gillen, Scott A. Wight, David S. Bright
Copper oxide has been detected in the copper containing alloys of Standard Reference Material (SRM) 482. This occurrence is significant because it represents heterogeneity within a standard reference material that was certified to be homogeneous on a
Displaying 42626 - 42650 of 74053
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