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Displaying 41726 - 41750 of 74337

Composite Substrate Research for Large-format HgCdTe IRFPAs

April 1, 2003
Author(s)
N. K. Dhar, Y Chen, P M. Brill, Paul M. Amirtharaj, S Velicu, P Boieriu, Anthony G. Birdwell
Research on silicon based composite substrates is being conducted at the Army Research Laboratory. These substrates can be used to deposit HgCdTe alloys to fabricate large-format infrared photodetector arrays. Traditionally, composite structures are

Direct Observation of Remanent Magnetic States in Epitaxial fcc Co Small Disks

April 1, 2003
Author(s)
C Vaz, L Lopez-Diaz, M Klaui, J Bland, T Monchesky, John Unguris, Z Cui
The magnetic nanostructure of epitaxial fcc Co/Cu(001) circular elements (1.7υm in diameter) has been imaged with scanning electron microscopy with polarization analysis. The disks are obtained by ultrahigh vacuum deposition of the metal films onto a

Electronic Properties of Quantum-Dot Molecules

April 1, 2003
Author(s)
W Jaskolski, M Zielinski, Garnett W. Bryant
We investigate the electronic structure of several double quantum dot systems: (I) hetero-dot artificial molecules built from two CdS chemically synthesized nanocrystals and (ii) two vertically stacked pyramidal self-organized InAs/GaAs quantum dots. The

Energy Dissipation Devices for Bridges with Steel Superstructures

April 1, 2003
Author(s)
Michael A. Riley
Recent earthquakes have clearly demonstrated the seismic vulnerability of bridges constructed with steel superstructures. The relative flexibility of these bridges, especially in the transverse direction, may result in overstressing or even failure of

Experimental Testing of Roof to Wall Connections in Wood Frame Houses

April 1, 2003
Author(s)
Michael A. Riley, Fahim H. Sadek
The majority of residential construction in the United States is wood-frame construction. These buildings perform well under gravity loads, but considerable damage has been observed in such structures after significant earthquakes and major hurricanes

Flame Retardant Mechanism of Silica - Effects of Molecular Weight of Resin

April 1, 2003
Author(s)
Takashi Kashiwagi, John R. Shields, Richard H. Harris Jr., Rick D. Davis
The effects of resin molecular weight, M w, on the flame retardant mechanism of silica were studied using two different molecular weights of PMMA, 122,000 g/mol and 996,000 g/mol and two silicas, fused silica with a low surface area and silica gel with a

Flux Pinning and Properties of Solid-Solution (Y,Nd) 1+x Ba 2-x Cu 3 O 7-d Superconductors

April 1, 2003
Author(s)
T J. Haugan, M E. Fowler, J C. Tolliver, Paul N. Barnes, Winnie K. Wong-Ng, Lawrence P. Cook
The effect of chemical composition variations on the flux pinning and physical properties of (Y,Nd)1+xBa2-xCu3O7-d superconductors was studied in powders processed by solid-state reaction and equilibrated in air at 910 C. An extended region of single-phase

High Resolution Infrared Studies of the N2, N4 Bands of 34 S 16 O 3 Including Both Intensity and Wavenumber Perturbations

April 1, 2003
Author(s)
J Barber, Tony Masiello, E T. Chrysostom, J Nibler, A G. Maki, A Weber, Thomas A. Blake, R L. Sams
The infrared spectrum of the Ņ 2, Ņ 4 bending mode region of 34S-substituted sulfur trioxide, 34S 16O 3, has been recorded at a resolution of 0.0025 cm -1. The Ņ 2 and Ņ 4 levels are coupled by a Coriolis interaction, yielding significant spectral shifts

High-accuracy determination of the dependence of the photoluminescence emission energy on alloy composition in Al x Ga 1-x As films

April 1, 2003
Author(s)
Larry Robins, J T. Armstrong, Ryna B. Marinenko, Albert J. Paul, John Pellegrino, Kristine A. Bertness
In an effort to improve the accuracy of photoluminescence (PL) measurements of the Al mole fraction (x) of Al xGa 1-xAs alloys, the PL peak emission energy, E PL,peak, was measured at room temperature for molecular-beam epitaxy-grown Al xGa 1-xAs films

High-Accuracy Determination of the Dependence of the PhotoluminescenceEmission Energy on Alloy Composition in Al x Ga 1-x As Films

April 1, 2003
Author(s)
Lawrence H. Robins, J T. Armstrong, Ryna B. Marinenko, Albert J. Paul, J G. Pellegrino, Kristine A. Bertness
In an effort to improve the accuracy of photoluminescence (PL)spectroscopy as a composition (Al mole fraction) measurement method forthe Al xGa 1-xAs alloy system, the PL peak emission energy,E PL,peak, was measured at room temperature for a set of MBE

High-Throughput Investigation of Cell Proliferation on Crystalline Polymers

April 1, 2003
Author(s)
N. R. Washburn, S B. Kennedy, Carl Simon Jr., K Yamada, Eric J. Amis
The results of our investigation of cell proliferation on crystalline polymers will be presented. The goal of the research is to investigate how cells respond to nanometer scale roughness, and crystallizing poly(L-lactic acid) (PLLA) was a convenient

Interlaboratory Comparison of Magnetic Thin Film Measurements

April 1, 2003
Author(s)
F C. Da silva, Chih-Ming Wang, D P. Pappas
A potential low magnetic moment standard reference material (SRM) was studied in an interlaboratory comparison. The mean and the standard deviation of the saturation moment m/s, the remanent moment m/ r, and the intrinsic coercivity H/c of nine samples

Isostructural Self-Assembled Monolayers, Part 1. Octadecyl 1-thiaoligo(ethylene oxides)

April 1, 2003
Author(s)
David J. Vanderah, Richard S. Gates, Vitalii I. Silin, D N. Zeiger, John T. Woodward IV, Curtis W. Meuse, Gintaras Valincius, B Nickel
The self-assembled monolayers (SAMs) of a series of octadecyl 1-thiaoligo(ethylene oxide)x disulfides {[S(CH 2CH 2O) xC 18H 37] 2}, where x = 4 to 8, were assembled on gold and characterized by reflection-adsorption infrared spectroscopy (RAIRS)

Johnson Noise Thermometry Measurements Using a Quantized Voltage Noise Source for Calibration

April 1, 2003
Author(s)
Sae Woo Nam, Samuel Benz, Paul Dresselhaus, Weston L. Tew, David R. White, John M. Martinis
We describe a new approach to Johnson Noise Thermometry(JNT) that takes advantage of recent advances in Josephson voltage standards and digital signal processing techniques. Currently, high-precision thermometry using Johnson noise is limited by the non
Displaying 41726 - 41750 of 74337
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