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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 75 for “"Thermal Diffusivity"”.
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The use of thermal diffusivity to quantify tissue perfusion
Thesis (Ph.D.)--Harvard-Massachusetts Institute of Technology Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1981.
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Experimental and theoretical evaluation of an increased thermal diffusivity phase change devices, An
Includes bibliographical references.
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A Quasi-Steady Method of Measuring Thermal Diffusivity of Metals at Elevated Temperatures
Made available in DSpace on 2014-12-05T19:15:51Z (GMT). No. of bitstreams: 1 0010468.pdf: 2179341 bytes, checksum: 3942490df34936358f2b45fb92270803 (MD5) Previous issue date: 1954
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A Thermistor Based Method for Measurement of Thermal Conductivity and Thermal Diffusivity of Moist Food Materials at High Temperatures
… of the thermistor based method for measuring thermal conductivity and diffusivity of moist food materials at high temperatures. Research focused on aspects of calibration, thermal contact in solid food materials, natural convection in liquid media and the performance in moist food materials at …
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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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On developing a graphitic white iron for metal-to-metal wear systems
… by developing a graphitic white iron to increase thermal diffusivity of the wear components. One of the premium materials commonly used in current metal-to-metal wear systems is Fe15Mo18Cr and field returned parts were characterized as part of this study. Failure analysis showed that white layers …
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Thermal conductivity/diffusivity of SiC-Mullite and SiC-SiC composites
… to determine as a function of temperature the thermal diffusivity and/or thermal conductivity of SiC-Mullite and SiC-SiC, and to explain the observed behavior in terms of changes in temperature, microstructure, composition, and/or orientation. Materials used in the SiC-Mullite study consisted …
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Inferring Microstructural Change via Non-Contact Ultrasonic Property Measurements
… precipitation, and grain growth due to thermal aging and irradiation in binary Cu-3at%Ti, where a clear relationship exists between thermal diffusivity, surface acoustic wave (SAW) frequency and microstructure. A model RPV alloy, which experiences embrittlement via the same mechanisms as …
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Investigations of the thermal properties of human and animal tissues
… to be usefully interpreted for detecting thermal anomalies in the human body at depths of up to several centimetres, the thermal and microwave dielectric properties of tissues must be known. This thesis is mainly concerned with the measurement and interpretation of the values of the …
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Thermal, Electrical, and Structural Analysis of Graphite Foam
… of carbon foam materials. The structure, thermal properties, electrical resistivity, isotropy, and density uniformity of PocoFoam were evaluated. These properties and characteristics of PocoFoam are compared with natural and synthetic graphite in order to show that, albeit similar, it is …
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Thermal expansion and thermal conductivity of (Ca<sub>1-x</sub>,Mg<sub>x</sub>)Zr₄(PO₄)₆ where x = 0.0-0.4
… for heat engine applications. Linear thermal expansion was determined with a dual push rod dilatometer and axial thermal expansion by high temperature X-ray diffraction and least squares refinement. Thermal diffusivity was determined with the laser flash method and specific heat by …
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Measurement of Thermal Properties of Seafood
Thermal properties of ten different seafood were measured in this research. They included bluefish (<i>Pomatomus saltatrix</i>), croaker (<i>Micropogonias undulatus</i>), spanish mackerel (<i>Scomberomorus maculatus</i>), pink salmon (<i>Oncorhynhus gorbuscha</i>), black seabass (<i>Atractoscion …
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Breaking the bottleneck in radiation materials science with transient grating spectroscopy
… are characterized by harsh mechanical, chemical, thermal, and irradiation environments that present a challenge for the materials engineer. Nuclear materials research and development is a subject of managing constraints: a component must be proven to retain its integrity in the reactor environment …
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Radiation Effects on Thermal Properties of Advanced Nuclear Materials
… evolution and its correlation to macroscopic thermal transport phenomena remain insufficiently characterized. In this work, ZrH and YH specimens were characterized pre- and post-irradiation via laser flash analysis, high-resolution dilatometry, and differential scanning calorimetry. …
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Modeling hotspot dynamics in microwave heating
… containing a bistable nonlinear term. When the thermal diffusivity is sufficiently small the leading order temperature solution of a singular perturbation analysis is used to reduce the system to a free boundary problem. This approximation accurately predicts the steady-state solutions for the …
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Thermal properties of combustion chamber deposits and their effect on engine heat transfer and octane requirement increase
An investigation of the thermal properties of combustion chamber deposits and their effect on engine heat transfer and Octane Requirement Increase (ORI) has been completed. Deposits were grown in a Chrysler 4-cylinder 2.2 liter engine with total test times of 50- and 250-hours. Two fuels were used, …
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Surface conditions effect on energy exchange at the soil surface
… Study one examined tillage effects on soil thermal properties and heat flux. Study two examined surface roughness effects on soil reflectance, net radiation, and the partitioning of net radiation;Soil thermal properties were examined after planting in the row zone for three common management …
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The effects of thermal radiation on dry convection
… Rayleigh-Benard convection, except that thermal radiative transfer is included. This type of system can be investigated in the laboratory. The second type of model is a more faithful representation of the earth's atmosphere. In this model, the temperature at the upper boundary is left …
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Experimental studies of the thermoelectric properties of microstructured and nanostructured lead salts
… devices allow for direct conversion between thermal and electrical energy. There applications, however, are severely limited by their inefficiency. A reduction in thermal conductivity of a material potentially enhances its overall thermoelectric performance and can improve the efficiency of …
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