Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Thermal Dissipation"”.
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Characterization of thermal dissipation within integrated gate bipolar transistor (IGBT) layered packaging structure
… in turn mounted onto a heat sink assembly, the thermal dissipation properties of the layered structure are crucial in keeping temperatures within operational boundaries. Traditionally, the selection of materials for the layered structure has been largely influenced by the thermal conductivity …
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Time-Resolved Interactions of Infrared Vibrations and Plasmonic Nanogaps
… ultrafast vibrational decay and microsecond thermal dissipation within nanoscale metal-molecule junctions. Novel spectroscopy approaches are developed which combine resonant mid-infrared (MIR) vibrational absorption with Raman scattering detection—employing precisely tailored plasmonic …
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Rubisco Activase -- a Typical AAA+ Protein With Unique Features, And, PIFI -- a Novel Chloroplast Protein Functioning in Chlororespiration
… The pifi mutant exhibited low capacity for thermal dissipation and a low oxidation level of the PSI reaction center, but similar electron transport efficiency of PSII as that of wild type, suggesting an impaired cyclic electron flow around PSI in the mutant. The PIFI protein is dispensable …
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Power And Hotspot Modeling For Modern GPUs
… high performance computing platforms, power and thermal dissipation are getting more attention. The trade-offs among performance, power, and heat must be well modeled and evaluated from the early stage of GPU design. This necessitates a tool that allows GPU architects to quickly and accurately …
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Assessing evapotranspiration rates of a Mid-Atlantic red maple riparian wetland using sap flow sensors.
… red maple riparian wetland were assessed with thermal dissipation probes during the 2002 growing season to address: a) if edge trees transpire more water daily than interior trees, b) correlations among sap flow rates and energy balance-derived estimates, c) variations in ecosystem ET estimates …
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Estimating Evapotranspiration of a Riparian Forest Using Sap Flow Measurements
… and arroyo willows, were instrumented with thermal dissipation probes. In addition to diurnal fluctuations, sap flow data collected hitherto also showed expected seasonal variation with summer maxima and winter minima, with transition fall and spring periods. Sap flow measurements from the …
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STRATIFIED WAKE SIGNATURES GENERATED BY PROPAGATING SUBMERGED BODIES IN THE PRESENCE OF AN ACTIVE INTERNAL WAVE FIELD
… We also estimate the noise for the turbulent and thermal dissipation rates by taking a time average over a tidal cycle prior to the introduction of the submerged body. Using this noise, we show that, for our parameters, the wake from a submerged body would be undetectable after 30–60 minutes of …
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Heterogeneously bonded vertical cavity surface emitting lasers and thermal modeling
… but with degraded performance due to excessive thermal dissipation. A VCSEL array with an area of 1.0 x 1.2 mm2 is transferred onto a Cu substrate which has a higher thermal conductivity compared to both GaAs and PET. For the transfer bonding process, the final device yield is enhanced by …
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The design and study of a vapor chamber fabricated via laser powder bed fusion
… multiphase heat spreaders and its corresponding thermal conductivity. From production, it was found possible to manufacture and successfully inject an AM VC with deionized and degassed water as a working fluid. From experiments, the results were inconclusive to successfully determine a thermal …
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Review of energy harvesting methods for twin screw extruders
… typically utilize either mechanical, thermal, radiation, flow-based, or bio-chemical energy sources. Research in low-power energy harvesting technologies is motivated by an increased interest in the Internet of Things and the need to create isolated electronic systems, such as wireless …
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Tempest: A Framework for High Performance Thermal-Aware Distributed Computing
… than ever before. This results in increased thermal dissipation, the need for powerful cooling systems, and ultimately a reduction in system reliability as temperatures increase. Over the past several years, the research community has reacted to this problem by producing software tools such …
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Design and Multi-physical Fields Analysis of High Speed Permanent Magnet Machines
… challenges with regard to electromagnetic, thermal and mechanical aspects of machine design. The higher power density also results in larger power loss per unit volume; due to the small machine size, machine thermal dissipation becomes difficult. Moreover, air frictional loss rises …
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Developing an active, high-heat-flux thermal management strategy for power electronics via jumping-droplet phase-change cooling
… (demonstrated to 13 W/cm^2) along with power dissipation levels (approximately 1.57 W). EFE condensation was shown to enhance the heat transfer from the local hot spot by approximately 200% compared to cooling without jumping and by 20% compared to non-EFE jumping. Dynamic switching of the …
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Miniaturization, Packaging, and Thermal Analysis of Power Electronics Modules
… layout and construction (with regards to thermal dissipation), materials comparisons have been made, and thermal simulations and experimental verifications performed. Issues relating to standardized power electronic module design and the efforts of this researcher at the Microelectronics …
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Multi-physics modeling of heat and particle transfer in porous media
… two main components: underground duct-bank thermal dissipation considering the convection heat transfer in porous media and the filtration mechanisms of bentonite grout in porous media. In the first part, the study challenges traditional underground duct-bank design assumptions and …
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Physics-Based Statistical Learning in Thermoacoustics
… the thermoacoustic mechanism and damped by visco-thermal dissipation and by radiation from the ends of the tube. We perform experiments only on the fully-assembled system, rather than on its individual components. We learn model parameters sequentially by using posterior values and uncertainties …
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Photoprotection and chloroplast regulation in the green algae Chlamydomonas reinhardtii
… fluorescence. The major components of NPQ are thermal dissipation of excess light energy (excitation dependent quenching, qE), the migration of antenna complexes from PSII to PSI (state transitions, qT) and inactivation of PSII by damage (photoinhibition, qI). Excess reductant generated during …
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Probing the upper limits of current flow in one-dimensional carbon conductors
… Experiments and modeling find the CNT-substrate thermal coupling scales proportionally to CNT diameter. Diffuse mismatch modeling (DMM) reveals the upper limit of thermal coupling ~0.7 WK 1m 1 for the largest diameter (3-4 nm) CNTs. Similarly, we extracted the GNR thermal conductivity (TC), ~80 …
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Geometrically-Accurate and Homogenized Fuel Region Models to Predict Cladding Temperatures within a Truck Cask under Normal and Fire Accident Conditions
… current work a two-dimensional finite-element thermal model of a legal-weight truck cask is constructed that accurately models the geometry of the fuel rods and cover gas. Computational fluid dynamics (CFD) simulations are performed that include buoyancy induced motion in, and radiation and …
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Water Use and Water Tolerance in the Riparian Species American Sycamore (Plantanus occidentalis L.) and How its Physiology Compares to the Coexisting Black Willow (Salix nigra Marshall)
… of sap flux (using Granier<em> </em>type thermal dissipation probes) were determined <em>in situ</em> for trees growing in a riparian buffer on the Kennesaw State University campus in north west Georgia. For each species, sap flux responses were examined in relation to light and vapor …
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