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Displaying 45826 - 45850 of 74141

Controlled Collapse of a Bose-Einstein Condensate

May 1, 2001
Author(s)
J L. Roberts, N R. Claussen, S L. Cornish, E A. Donley, Eric A. Cornell, C E. Wieman
The point of instability of a Bose-Einstein condensate (BEC) due to attractive interactions was studied. Stable 85Rb BECs were created and then caused to collapse by slowly changing the atom-atom interaction from repulsive to attractive using a Feshbach

Copper-Catalyzed Radiolytic Reduction of CO 2 to CO in Aqueous Solutions

May 1, 2001
Author(s)
J Grodkowski, Pedatsur Neta
Radiolysis of aqueous solutions containing CO 2 and Cu(II) ions under reducing conditions leads first to reduction of the Cu(II) and then to formation of CO. Experiments under various conditions show that although Cu(II) was often reduced to colloidal Cu(0

Defect Controlled Diffusion in the Epitaxial Growth of Germanium on Si(100)

May 1, 2001
Author(s)
C L. Berrie, B Liu, S R. Leone
The growth of germanium films on Si(100) substrates prepared by two different methods is studied using atomic force microscopy and reflection high energy electron diffraction. The first method uses a brief Ar + sputter followed by annealing to desorb the

Effective Medium Theory of the Porosity Dependence of Bulk Moduli

May 1, 2001
Author(s)
R G. Munro
Effective medium theory is used to obtain a closed form expression for the porosity dependence of the bulk moduli of ceramics. The theory is illustrated with an application to data for high purity alumina that spans a volume fraction of porosity ranging

Effects of Nonlinear Diode Junction Capacitance on the Nose-to-Nose Calibration

May 1, 2001
Author(s)
Kate Remley, Dylan Williams, Donald C. DeGroot, Jan Verspecht, John Kerley
We examine the effects of nonlinear diode junction capacitance on the fundamental premise of the noise-to-nose calibration, that the kickout is identical in shape to the impulse response of the sampler. We offer a physical explanation for the error

Electron and Nuclear Spin Interactions in the Optical Spectra of Single GaAs Quantum Dots

May 1, 2001
Author(s)
R W. Gammon, A L. Efros, T A. Kennedy, M Rosen, D S. Katzer, D Park, Steven W. Brown, V L. Korenev, I A. Merkulov
Fine and hyperfine splittings arising from electron, hole and nuclear spin interactions in the magneto-optical spectra of indivisual localized excitons are studied. We explain the magnetic field dependence of the energy splitting through competition

Evaluating Optical Materials

May 1, 2001
Author(s)
Charles S. Tarrio, Thomas B. Lucatorto
curately quantifying optical constants is key to fabricating successful multiplayer film components

Expanding BACnet's Horizons

May 1, 2001
Author(s)
Steven T. Bushby
The International Air-Conditioning, Heating, Refrigerating Exposition that accompanied the 2001 ASHRAE Winter meeting in Atlanta included the largest interoperability demonstration of BACnet products ever held. It marked the five-year anniversary of the

Extrusion Visualization - from Blend Structure to Sharkskin

May 1, 2001
Author(s)
Kalman D. Migler
Over the last five years, we have developed optical technologies for in-line monitoring of extrusion. We review two areas where we have succeeded in uncovering important concepts and phenomena by shedding light on processes that were previously

Greens Functions for Boundary Element Analysis of Anisotropic Bimaterials

May 1, 2001
Author(s)
J R. Berger, Vinod K. Tewary
We present several region-dependent Green's functions for anisotropic bimaterials in two-dimensional elasticity and steady-state heat transfer problems. The details of the various Green's functions for perfect, slipping, and cracked interfaces are given

Growth and Characterization of Large Area Cu(In, Ga) Se 2 Films

May 1, 2001
Author(s)
A M. Hermann, Carlos A. Gonzalez, P A. Ramakrishnan, Davor Balzar, C H. Marshall, J N. Hilfiker, T Tiwald
Large area thin films of Cu(In,Ga)Se 2 (CIGS) were grown by sequential sputtering. Photovoltaic cells have been fabricated using these films and the performance bias been characterized. The effect of annealing conditions (temperature and duration) of the

High-Resolution Rb Two-Photon Spectroscopy With Ultrafast Lasers

May 1, 2001
Author(s)
T H. Yoon, A Marian, John L. Hall, Jun Ye
A two-photon wmsition in cold Rb atoms will be probed with a phase-coherent wide-bandwidth femtosecond laser comb. Frequency domainanalysis yields a high resolution picture where phase coherence among various transition pathways through different
Displaying 45826 - 45850 of 74141
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