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 19 of 19 for “"RF heating"”.
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Physics of RF heating systems on proto-MPEX
… conditions in front of a target station using RF technology. Proto-MPEX is the device that is currently operating at ORNL, where the viability of this RF technology is being demonstrated. The electron density, electron temperature, and ion temperature of the target plasma will be controlled …
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Inline disinfestation of canola seeds from red flour beetles using a 50-ohm RF technology
… grains. A pilot-scale 50-ohm radio frequency (RF) heating system was used to disinfest adult red flour beetles (Tribolium castaneum) in bulk canola seeds (Brassica napus L.) of 9 % moisture content (MC) in a tubular applicator with parallel electrodes. The heating characteristics of the bulk …
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RF-induced Heating Assessment and Heating Reduction Techniques for Partially-In and Partially-Out Medical Implants in MRI
… strong static, gradient, and radio frequency (RF) fields to produce detailed images of internal body structures. However, patients with partially-in and partially-out (PIPO) medical implants who require MRI scans are continually growing and often excluded from examinations or subjected to scans …
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Comprehensive MRI Safety Assessment: Impact of Strain-Relief Loop Position, Lateral Movement, and Varying Field Strengths on RF-Induced Heating of Medical Implants
… strong magnetic fields and radiofrequency (RF) waves to produce detailed images of human organs, tissues, and various anatomical structures. Despite its benefits, individuals with active implantable medical devices (AIMDs) and passive implantable medical devices (PIMDs) are often restricted …
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Radiofrequency heating of nanoclusters and nanoparticles for enzyme activation
Radiofrequency (RF) fields heat magnetic nanoparticles. Applications include remote drug delivery and noninvasive cancer therapy. The underlying objective is to increase temperatures precisely where desired without heating the surroundings. Before our work, the replicable limit of this precision …
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Effective Methods To Reduce The RF-Induced Heating For Medical Implants In MRI
Radiofrequency (RF) –induced heating is one of the primary safety concerns for patients with medical implants undergoing magnetic resonance imaging (MRI). Due to this potential hazard, patients with medical devices are usually contraindicated from the MRI process. With the steady growth in the …
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Performance analysis of high power photoconductive switch at elevated temperature
… microwave generation. Specifically, effects of heating on the contacts and the bulk were studied. The changes in the I-V characteristics before and after heating the switches were analyzed. For heating effects, a power density input had been taken from an electromagnetic code and the simulations …
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An Investigation of Full-Wave Effects on Lower-Hybrid Wave Propagation, Absorption, and Current Drive
… drive (LHCD) has been used as a radio-frequency (RF) heating and current drive actuator in tokamaks for over 40 years. However, despite being one of the first experimentally demonstrated sources of RF current drive, LHCD has never been consistently predicted by numerical simulation using coupled …
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Modeling enhanced impurity sputtering due to rf sheaths in front of ICRH actuators
… concerns over using the Ion Cyclotron Resonance Heating (ICRH) is the enhanced impurity sputtering phenomenon due to the emergence of RF sheaths near the Faraday Screen of the ICRH antenna. Here we present a semi-analytical fluid plasma model able to capture the enhanced sputtering yield from the …
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Construction And Demonstration Of A Tandem Mass Spectrometer Based Instrument For Cold Ion Spectroscopy
… to a minimum of 50 K due to the additional RF heating associated with a quadrupolar trapping field.</p>
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MRI Safety Evaluation of Dual Leads and Fractured Leads Active Implantable Medical Devices in MRI
Magnetic resonance imaging (MRI) radiofrequency (RF)-induced heating is of great concern for patients with active implantable medical devices (AIMDs) undergo MR scanning. RF safety evaluation of AIMDs consists of two steps: (1) the development of the AIMD model (i.e., transfer function (TF) …
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Study of molybdenum sources and screening in the Alcator C-Mod tokamak
… This work contributes in characterizing the performance of molybdenum, a high Z material, as a tokamak first wall surface. Understanding the molybdenum production mechanism is crucial if one wants to minimize it. A simple physical sputtering model has been developed that calculates the …
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Preparation and characterization of multifunctional chitosan microparticles for lung delivery
… agent as well as radio frequency (RF) heating for targeted lung cancer therapy. The system designed for achieving this was a chitosan microparticulate system containing iron oxide nanoparticles and gemcitabine as the chemotherapeutic agent. Iron oxide nanoparticles were prepared by …
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Ultra-high field (7T) magnetic resonance fingerprinting
… inhomogeneity, increased spectral bandwidth, and RF heating. Quantitative parametric mapping produces maps of tissue T1, T2 and other parameters in standard units rather than the weighted images normally produced in MRI. This has advantages by facilitating multi-site studies, long-term …
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Studies of aspect angle dependence of plasma turbulence at HAARP
<p>We report the results from a recent series of campaigns employing the HAARP HF transmitter to generate and study strong Langmuir turbulence (SLT) in the interaction region of overdense ionospheric plasma. Diagnostics included the Modular UHF Ionospheric Radar (MUIR) sited at HAARP, the Super …
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Silver nanoparticles and thin films for strained-silicon surface enhanced raman spectroscopy and capacitively-coupled radiofrequency heating
… wide range of novel uses and applications. The surface plasmon polariton response of Ag NPs and thin films dispersed onto nm-thin layers of strained silicon (ɛ-Si) grown on Si1-xGex virtual substrates can be utilised to provide surface enhanced Raman spectroscopy (SERS) of the ɛ-Si layer compared …
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MITIGATION OF TEMPERATURE POLARIZATION AND MINERAL SCALING IN MEMBRANE DISTILLATION: THE IMPACT OF INDUCTION HEATED ELEMENTS
… as the feed solution requires continuous heating to provide an efficient driving force. The present work aims to develop and optimize a novel, efficient, and robust MD system utilizing an electromagnetic field, i.e., induction heating (IH) as a heat source for MD distillation, specifically …
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Three-dimensional modeling of plasma transport in the HIDRA stellarator
… include a dedicated toroidal plasma-material interface (PMI) device, the Hybrid Illinois Device for Research and Applications (HIDRA) has been dedicated. HIDRA is an l=2, m=5 classical stellarator originally built in in the 1970's for RF heating studies. Its most recent users at the Max Planck …
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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 …