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 93 for “"Joule heating"”.
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A joule heating mechanism for high-speed fused filament fabrication
… factor for prints. This work explores resistive joule heating as a method to increase heat transfer into an electrically conductive composite feedstock. This requires usage of an electrically insulating liquefier in order to co-locate both conduction and joule heating. A prototype mechanism was …
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Beyond Flash Joule Heating: Advanced Non-equilibrium Synthesis and Electron Microscopy Characterization
Flash Joule heating (FJH) has emerged as a highly efficient method for synthesizing a diverse array of advanced materials. This ultrafast, non-equilibrium technique has demonstrated significant potential in transforming various carbon sources into turbostratic flash graphene, synthesizing …
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Modeling of Joule heating and thermoelectric transport in thin film silicon for SJEM measurement
… data acquisition technique of Scanning Joule expansion microscopy (SJEM). Time varying heat equations and Maxwell’s equations are solved in frequency domain and applied to commercial finite element software, COMSOL. Chapter 1 introduces various techniques to obtain nanoscale temperature …
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Joule heating and pore pressure evolution, magmatic intrusions at continental rifts, and microseisms in Yellowstone Lake
The goal of this thesis is to investigate research topics related to geothermal resources. Chapter 1 introduces the thesis and motivates the need to study research topics in relevant geothermal environments, and develop new technologies to economically extract heat from these resources. In Chapter …
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Joule Heating and Pore Pressure Evolution, Magmatic Intrusions at Continental Rifts, and Microseisms in Yellowstone Lake
The goal of this thesis is to investigate research topics related to geothermal resources. Chapter 1 introduces the thesis and motivates the need to study research topics in relevant geothermal environments, and develop new technologies to economically extract heat from these resources. In Chapter …
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Thermally Developing Electro-Osmotic Convection in Circular Microchannels
… The imposed voltage gradient results in Joule heating in the fluid with an associated volumetric source of energy. For this scenario coupled with a slug flow velocity profile, the analytical solution for the fluid temperature development has been determined for both thermal boundary …
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Flow of Entropy in Equilibrium and Non-Equilibrium Quantum Systems
… and their interpretation is made. An analysis of Joule heating in an exactly solvable model of a quantum wire is performed using the proposed unitary formula. It is shown that when very many local measurements are made of the nonequilibrium electron distribution in the wire, Joule heating, a …
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Taking Steps Towards Superfluid-like Spin Transport in Metallic Ferromagnets
… carry information. This comes with ever-present Joule heating as a result of the resistive scattering of electrons. Recent works in the field of spintronics have focused on using magnetic excitations (e.g., spin waves) instead of electrons as a means of information transport without Joule …
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In-situ TEM study of carbon nanomaterials and thermoelectric nanomaterials
… I also report the use of either furnace heating or Joule heating to pacify the exposed graphene edges by loop formation in the graphitic nanoribbons. The edge energy minimization process involves the formation of loops between adjacent graphene layers. An estimation of the temperature …
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Effects of an electric current applied to metals during solidification
… theories. Simple calculations showed that joule heating does not create enough heat flux to change the temperature and effect the formation of nuclei in the melt. Experimental results showed that the observed phenomenon was due to the effects on a nucleation-based process, not a growth …
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Real-time control of industrial robots for shape setting Nitinol rods
… has been built to shape-set Nitinol rods with Joule heating.
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A heat transfer finite element model of a high speed DC electric motor
… motor housing. Power dissipation is modeled as Joule heating in the motor winding elements and iron core losses in the stator laminations. The two-dimensional axisymmetric model is preprocessed using a two dimensional mesh generator. Results are postprocessed with a two-dimensional contour …
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Use of Bioheat Modeling to Characterize and Optimize Implantable Medical Devices and Neuromodulation Technologies
… back pain, produces heat via the principle of joule heating. Similarly, several therapeutic cooling technologies are providing neuroprotective effects in brain injury patients via focal intracranial cooling technologies. Nonetheless, heating or cooling effects of these medical devices require …
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Manufacture of aerospace-grade thermoset and thermoplastic composites via nanoengineered thermal processing
… to a narrow range of part geometries. Direct Joule heating with carbon nanotube (CNT) film network heaters has shown significant promise to overcome these key manufacturing challenges of composites in the aerospace industry.
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Optimization of purely semiconducting carbon nanotube complementary field effect transistors
… metallic nanotube removal process with joule heating induced thermocapillary flow in thin organic layers. Detailed experimental studies reveal the selective removal of metallic SWNTs. We provide statistically significant demonstrations to prove the effectiveness and selectivity of this …
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Manipulation of bacteria using three dimensional insulator based dielectrophoresis
… minimal thermal shock on the particles due to Joule heating effects. The dielectric properties of a range of bacteria, as well as polystyrene beads are examined. The impact of these results on the development of microbial fuel cells and portable low-cost clinical diagnostic tools is also …
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Mobility and Saturation Velocity in Graphene on Silicon Dioxide
… thermal generation, “puddle” charge, and Joule heating. Graphene mobility is characterized as a function of carrier density at temperatures from 300 to 500 K. In addition, electron drift velocity is obtained at high electric fields up to 2 V/μm, at both 80 K and 300 K. Mobility displays a …
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Multiphysics Design and Modeling for Advanced Packaging and Heterogeneous Integration of Power Delivery
… performance at elevated temperatures, minimizing Joule heating and inductance loss. Designing such components requires robust multiphysics modeling, yet conventional methods are computationally intensive. This thesis proposes solutions for both efficient embedded inductor design and …
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Implantable electrode structures and their RF effects in MRI machines
… long insulated conductors can generate a serious heating hazard to a patient undergoing a Magnetic Resonance Imaging (MRI) scan. Under the high-power RF field from an MRI machine, the conductors can behave as antennas and concentrate energy into small regions of body tissue, leading to excessive …
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