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 25 for “"Dimple"”.
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Design and Analyses of a Dimple Array Interconnect Technique for Power Electronics Packaging
… interconnect technology, termed the Dimple Array interconnect (DAI), with significantly improved electrical, thermal and mechanical characteristics for power electronics applications. In the DAI structure, electrical connections onto the devices are achieved by solder bumps formed …
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Heat Transfer Augmentation Surfaces Using Modified Dimples/Protrusions
… heat augmentation surfaces roughened by modified dimples/protrusions. The dissertation is composed of two main parts: Part I (Chapters 2-4) for compact heat exchangers and Part II (Chapter 5) for internal cooling of rotating turbine blades. Part I consists of three phases: Phase I (Chapter 2) …
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Computations of Flow Structures and Heat Transfer in a Dimpled Channel at Low to Moderate Reynolds Number
… channel with concave indentations on one wall. A dimple depth to channel height ratio of 0.4 and dimple depth to imprint diameter ratio of 0.2 is used in the calculations. The Reynolds number (based on channel height) varies from Re = 25 in the laminar regime to Re = 2000 in the early turbulent …
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Which Side Are You on? : Prosthetic Vaginas, Cross-dressing Madonnas, and Queer Theology in Virgin of the Flames and Narcopolis
… dimensions of sex. Similarly Thayil’s narrator Dimple, a castrated biological male prostitute living as a woman, expounds on the nature of sex after a customer asks, “What I want to know, do you feel pleasure or not?” (124). Dimple responds, “Not like you do and not the way a woman does […] I …
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The influence of thermal history on the hot ductility of Ti containing C Mn Al and C Mn Nb Al steels
… particles) generally leads to an increase in the dimple size and to better ductility. Interestingly, adding Ti to steels causes a larger dimple size to occur even though ductility deteriorates as the formation of TiN removes small AIN particles from solution. Thus the dimple size increases as it …
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Structural mechanics of a plate with multiple dimples
… been given) out-of-plane depth or texture: a dimpled sheet. By developing new methods of analysis for these types of modified plate geometries, increases in performance can be sought and quantified. Compared to flat plates, corrugated sheets have an increased bending stiffness in one …
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Transmission Electron Microscopy Preparation and Characterization of Bulk ZnO and Au(111) / ZnO(000-1) Heterostructures
… the brittle behavior of the material. A repeat dimple process was introduced to ameliorate this problem. In this procedure, the sample was dimpled while it is >200 microns, polished from the backside and then redimpled with a felt-polishing wheel. Ion milling with a low beam current (2-4), a low …
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Detailed Experimental Measurements of Heat Transfer Augmentation in Internal Channels Using a Thermochromic Liquid Crystal Technique
… techniques for internal cooling, viz. dimple and swirl induced jet impingement. Dimples are suitable candidates for high performance enhancement as they impose a low pressure drop penalty. The present study aims at experimentally measuring heat transfer on all the walls of diamond, …
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Mapping plasmon excitations in gold nanostructures using electron energy loss spectroscopy
… to considering out of plane coupling of complex dimple systems found in biosensor used in protein detection. The motivation for this work comes from a need to further understand the detection mechanism of these plasmonic sensors, using simulated electron energy loss spectroscopy. Our examination …
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Ultracold rubidium and potassium system for atom chip-based microwave and RF potentials
… 87Rb atoms in an atom chip trap that features a dimple and good optical access. We have also demonstrated production of ultracold 39K and subsequent loading into the chip trap. We describe the details of the dual chamber vacuum system, the cooling lasers, the magnetic trap, the multi coil …
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The influence of ethnicity, socioeconomic status and obesity intervention on body composition in UK children and adolescents
The prevalence of childhood overweight and obesity has increased over the last twenty years. Additionally, obesity and its related morbidities are not equally distributed across the UK population with it varying between sexes, age groups, socioeconomic groups and ethnic groups. This thesis is …
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Design of passive decay heat removal system for the lead cooled flexible conversion ratio fast reactor
… a perforated plate, and round indentations, or dimples, were considered as additions to the hot air riser to increase heat transfer. Other enhancements include a liquid metal bond between the reactor and guard vessels, and a dual-level design which introduces ambient temperature air halfway up …
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Design of Surface Texture for the Enhancement of Tribological Performance
… identified for textures in the form of circular dimples. The current study aims to improve the friction reduction effect of surface texturing by using textures with novel designs. Some new factors considered in the design of textures are: internal structure and geometric shape. A new type of …
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VUV 157nm F₂ laser irradiation of micro- and nano-scale particles
… material underneath the particle to form a dimple on the surface of the substrate. The substrate-shielding effect leads to the removal of the substrate material around the opaque particle while the underlying material is left behind. This forms a polymeric support structure, with the seeding …
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Kinetic electron phenomena in dense magnetized plasma wakes
… where electron holes spawned from a narrow dimple in the velocity-distribution grow to large velocity extents, leading to disruption of the ion beams present in the wake. Those beams are the result of shadowing by the obstacle, which also occurs for electrons in what is a less elongated …
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Fabrication and buckling of thin spherical shells containing precise geometric imperfections
… technique allows us to introduce a single dimple-like defect with controllable geometric properties. We systematically vary the amplitude and width of the defect, and then we present a quantitative relationship between the critical buckling pressure and the defect geometry. Our results can …
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Development of Bioassays Based on Nucleic Acid Amplification and Next-Generation Sequencing
Adulteration and mis-labeling of honey to mask its true origin have become a global concern. Pollen microscopy, the current gold standard for identifying the geographical origins of honey, is very laborious and requires extensive training. In addition, filtered honey cannot be identified by pollen …
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Relationship of dietary antioxidant intake, antioxidant serum capacity, physical activity and inflammation in breast cancer survivors and individuals without a history of cancer
Background: Dietary and serum antioxidants and physical activity can effect inflammation, which is associated with breast cancer risk and recurrence. This study investigated the relationship between diet, serum antioxidant capacity, physical activity, and inflammation in breast cancer survivors and …
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Technology for Planar Power Semiconductor Devices Package with Improved Voltage Rating
… parallel plates structure (MIPPS), dimple array interconnection (DAI), power overlay (POL) technology, and embedded power (EP) technology. None of them meets the requirements of low profile and high voltage rating. The objective of the work in this dissertation is to propose and …
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Tribological studies of surface texturing for application in air-conditioning and refrigeration compressors
… iron compressor surfaces. Three types of micro-dimple patterns (40 μm diameter and 10 μm depth, 60 μm diameter and 7.5 μm depth, 60 μm diameter and 4 μm depth) with two area densities of 5% and 20% were created on the pin surfaces by the method of laser surface texturing. The results of the …
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