OSP Final Research Reports

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Now showing 1 - 10 of 2236
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    Exploration of the energy and thermal behaviors of emerging architectures
    (Georgia Institute of Technology, 2014-09-30) Yalamanchili, Sudhakar ; Kim, Hyesoon
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    Data staging on future platforms: Systems management for high performance and resilience
    (Georgia Institute of Technology, 2014-05) Schwan, Karsten ; Eisenhauer, Greg S. ; Wolf, Matthew
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    Development of a label free glycan arrays for the detection of prostate cancer
    (Georgia Institute of Technology, 2014-04) Adibi, Ali
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    Magneto-optical study of correlated electron materials in high magnetic fields
    (Georgia Institute of Technology, 2014-01) Jiang, Zhigang
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    Dynamic modeling of plasma effects during multi-phase detonations near a surface and/or in a magnetic field
    (Georgia Institute of Technology, 2013-12) Menon, Suresh ; Schulz, Joseph
    A multi-physics model has been developed to simulate detonations and condensed-phase explosions in the presence of an external electromagnetic field. To simulate these effects, models for high-temperature gas physics, plasma-production, dispersed-phase mixing, and turbulence have been implemented within the framework of a numerical method capable of simulating magnetohydrodynamic (MHD) flows. This research has leveraged past work in MHD flows, detonations, and turbulence-chemistry interactions to study multi-scale detonation-plasma-field interactions, and has furthered the understanding of many key physical processes of these flows. This work targeted three main basic science objectives: the study of plasma-production by detonations and condensed-phase explosions, the study of MHD instabilities and turbulence relevant to post-detonation flows, and the study of how a detonation is affected by the presence of a magnetic field. Simulations indicate that gaseous detonation waves generate a weakly ionized plasma in the post-detonation region. The average electrical conductivity in the post-detonation flow, however, is of the order of 10-3 S/m, and practical engineering applications involving the use of MHD forces to manipulate the flow for generation of electrical power, propulsive thrust, etc., require higher levels of electrical conductivity. Simulations of mixtures seeded with particles of a low ionization potential show a substantial increase the flow's electrical conductivity. The presence of these particles can adversely affect the detonation propagation. The physics of how an electromagnetic field interacts with the conducting products of a detonation, and how that interaction might affect the stability and propagation of the detonation wave is systematically studied. The magnetic field applied in the direction of detonation propagation affects the detonation through a combined effect of Joule heating and Lorentz force, in some cases altering the cellular structure of the detonation completely by reducing the half-reaction zone thickness. Basic studies of the Richtmyer-Meshkov instability, an important mechanism for the transition to turbulence in explosions, are used to elucidate several salient features of these types of MHD flows. Namely, simulations show that the presence of a dispersed phase alters the mixing growth-rates of the instability, and furthermore, an applied magnetic field is shown to either suppress or enhance fluid mixing.
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    Theory and algorithms for convex programming
    (Georgia Institute of Technology, 2013-10-31) Monteiro, Renato D. C.
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    Forced internal convection mist cooling heat transfer
    (Georgia Institute of Technology, 2013-09-26) Sadowski, Dennis L.
    This report describes work completed and results achieved on the” Forced Internal Convection Mist Cooling Heat Transfer” project from its inception on November 4, 2002 through its conclusion on August 31, 2013. This work involved close collaboration between the Georgia Institute of Technology (GT), the Schoonover Consulting Group (SCG), and the Naval Research Laboratory (NRL). The primary goal of the project was to design, develop, and test a system to adequately cool the Hibachi foils in the Electra KrF laser at the Naval Research Laboratory in Washington, DC. Though it took several iterations, we did successfully devise a system which met the goal of keeping the foils cool with minimal disruption to the focal profile or efficiency of the laser. By withdrawing a relatively small amount of KrF gas from the laser and redirecting it towards the Hibachi foils in the form of hundreds of tiny high velocity near-wall jets the foils showed a dramatic decrease in temperature. Focal profile measurements of the laser beam were far better than that achieved by any other cooling system. It is unfortunate that Congressional funding cuts scuttled the Electra program before we were able to complete full-scale, long-term testing with gas recirculation.
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    Physical modeling of low-k dielectric breakdown and the estimation
    (Georgia Institute of Technology, 2013-08) Milor, Linda S.
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    Qameleon: Hardware/software cooperative automated tuning for heterogeneous architectures
    (Georgia Institute of Technology, 2013-08) Kim, Hyesoon ; Vuduc, Richard
    The main goal of this project is to develop a framework that simplifies programming for heterogeneous platforms. The framework consists of (i) a runtime system to generate code that partitions and schedules work among heterogeneous processors, (ii) a general automated tuning mechanism based on machine learning and (iii) performance and power modeling techniques and profiling techniques to aid code generation.
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    Computational modeling of mechanical heart valves
    (Georgia Institute of Technology, 2013-06-30) Yoganathan, Ajit P.