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 56 for “"Thermal conductance"”.
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Thermal conductance of metal surfaces in contact
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1959.
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Thermo-optic Phase Spectroscopy techniques for multiscale thermal conductance characterization in semiconductor integrated circuits
Thermal management remains a critical challenge in the advancement of semiconductor integrated circuits, particularly with the emergence of three-dimensional (3D) architectures for high-performance applications. This thesis introduces Thermo-optic Phase Spectroscopy (TOPS), a family of …
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Effect of interfacial thermal conductance and fiber orientation on the thermal diffusivity/conductivity of unidirectional fiber-reinforced ceramic matrix composites
… In the study of the effect of an interfacial thermal barrier, a composite with fibers having a carbon-rich coating of about 3 J.l m was chosen as the reference material. The fiber-matrix interface was then modified by preferential oxidation of the carbon coating on the fibers, using fibers …
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Nanoscale Thermal Transport at Graphene-Soft Material Interfaces
… in matrices of soft materials are promising thermal management materials. A fundamental understanding of the thermal transport at graphene-soft material interfaces is essential for developing these nanocomposites. In this dissertation, thermal transport at graphene-octane interfaces was …
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Thermal transport across transfer printed metal-dielectric interfaces: Influence of contact mechanics and nanoscale energy transport
Recent experiments suggest that the interfacial thermal conductance of transfer printed metal-dielectric interfaces is ~45 MW/m2K at 300K, approaching that of interfaces formed using physical vapor deposition. In this work, we investigate this anomalous result using a combination of theoretical …
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Thermal transport in individual single-wall carbon nanotubes
… thermometer, was used to directly measure the thermal conductance of three individual SWCNTs. These results show the effects of Umklapp phonon-phonon scattering remain weak and the thermal conductance remains roughly proportional to the ballistic conductance throughout the temperature range of …
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Heat Transport across Dissimilar Materials
… lengthscales, the contribution of the interface thermal resistance often becomes comparable to the intrinsic thermal resistance offered by the device or structure itself. In many microelectronic devices, heat has to transfer across a metal-nonmetal interface, and a better understanding about the …
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Thermal transport across interfaces with molecular layers
This thesis presents the experimental study of thermal transport across molecular interfaces. Molecular interfaces are fabricated by assembling Au nanocrystals with controllable surface chemistry onto oxide substrates such as quartz and sapphire. A self-assembled monolayer (SAM) of silane molecules …
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Seasonal Energetics of the Cotton Rat (Sigmon Hispidus) From Southwest Missouri
… rates, nonshivering thermogenesis (NST), thermal conductance, and body mass were made. In addition, serum thyroxine (T₄) levels (June, 1988 through April, 1989) and triiodothyronine (T₃) serum levels (February, 1989 through January 1990) were analyzed. Oxygen consumption data were measured …
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Third Harmonic Generation as a Probe of Ultrafast Phase Transitions
… as the first quantitative measurements of the thermal conductance of metal-metal interfaces. The room temperature interface conductance of the as-prepared Al-Cu interface is 4 GW M -2 K-1, and the interface conductance decreases as the interface is made diffuse by ion beam mixing.
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Substrate dependance, temperature dependance and temperature sensitivity and resolution of doped-silicon microcantilevers
… rst objective seeks to understand the speci c thermal interactions between a heated microcantilever tip and various substrates. The experiments investigate thermal conductance, thermal time constant, and temperature-dependant adhesion force between and cantilever tip and substrates of silicon, …
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Advanced Thermal Management Strategies – Scalable Coal-Graphene based TIMs and Additively Manufactured Heat Sinks
… and high performance in electronics, thermal management is a very important area of research today. In multiple applications such as portable electronics, consumer electronics, military applications, automobile, power electronics, high performance computing, etc. innovative thermal …
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The Kapitza resistance at metal-helium interfaces
… 4He , suggesting the presence of an enhanced thermal conductance between liquid 3He and metals, as has been observed in other laboratories. Measurements of the Kapitza resistance have also been made at liquid and solid 4He - Cu interfaces and at solid Ne-Cu interfaces at 0.4 - 1.2 K. The …
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Effects of Ultrathin Interlayers on Thermal Boundary Conductance at Metal-Dielectric Interfaces
… materials have an increasingly important role in thermal management of numerous technologies such as thermoelectric energy conversion, microelectronics, and plasmonic devices. Understanding the heat transport contributions from the interface is crucial when interfacial resistance forms a …
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THERMAL AND THERMOELECTRIC PROPERTIES OF TWO-DIMENSIONAL HETEROSTRUCTURES
… and improved properties. The study of thermal properties is important for heat management of electronic devices while good thermoelectric properties are desired for energy-conversion devices. Despite numerous studies on the electrical and optical properties of 2D materials, less …
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Ultra-sensitive Mid-infrared Detection Using Phononic Crystal Resonator-based Oscillator
… but typically require cryogenic cooling, and (2) thermal-based sensors, which can operate at room temperature but suffer from low sensitivity and slow response times. In this thesis, I demonstrate room-temperature MIR detectors based on surface acoustic wave (SAW) phononic crystal (PnC) …
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Aspects of the energetics and renal physiology of some African arid-adapted rodents
… metabolism, evaporative water loss and thermal conductance was studied in the North East African pigmy gerbil, gerbillus ppusillus; This gerbil did not strictly maintain homoeothermy and like most arid-adapted rodents had a reduced basal metabolic rate. When G. pusillus was maintained on …
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Using high pressure to study thermal transport and phonon scattering mechanisms
… for heat dissipation and moderation of thermal expansion, and the semiconductor industry faces a Joule heating barrier in devices with high power density. Be it for the nanocomposite frame of a satellite's solar panel array, or a miniaturized high-power RF circuit, these industries share …
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Nanoscale thermal transport through solid-solid and solid-liquid interfaces
… is a process initiated by the presence of a thermal gradient. All interfaces offer resistance to heat flow in the form of temperature drop at the interface. In micro and nano scale devices, the contribution of this resistance often becomes comparable to, or greater than, the intrinsic thermal …
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Ultra-thin boron nitride films by pulsed laser deposition: Plasma diagnostics, synthesis, and device transport
… for high performance graphene devices.</p> <p>Thermal conductivity measurements of as-deposited <em>a</em>-BN and annealed <em>h</em>-BN were made possible by a nanofabricated freestanding bridge configuration, where the enhanced surface diffusion allowed for 100 nm <em>h</em>-BN grain …
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