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 14 of 14 for “"Non-uniform electric field"”.
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High-Frequency Electronics for Contactless Dielectrophoresis
The field of sample enrichment is currently receiving a large amount of attention because it is essential to reduce the time required for many laboratory processes. Dielectrophoresis, or the motion of a polarized particle in the presence of a non-uniform electric field, has emerged as a promising …
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Voltage programmable diffraction grating device
… oil which coats a 0.5 μm thick layer of dielectric (SU8 photoresist) that itself has been deposited on to a glass substrate that is patterned with the indium tin oxide electrodes. The pattern of electrodes (interdigitated electrodes) was produced by standard photolithography techniques and …
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Combined effect of electric field and surface modification on pool boiling of R-123
… of surface modification and high intensity electric field (uniform and non – uniform) acting separately or in combination on pool boiling of R-123 is presented in this thesis. The effect of surface modification was investigated on saturated pool boiling of R-123 for five horizontal copper …
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Dynamic simulations of particle suspensions subjected to an external electric-field
… study the suspension of polarizable particles in nonconductive solvents subjected to external electric fields. Such particles experience both hydrodynamic and electrostatic interactions. The hydrodynamic force acting on the particles is determined using the Stokesian dynamics method under the …
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Bayesian Optimization of PCB-Embedded Electric-Field Grading Geometries for a 10 kV SiC MOSFET Power Module
… optimization technique is used to design electric field grading structures in a PCB-integrated bus bar for a 10 kV bondwire-less silicon-carbide (SiC) MOSFET power module. Due to the ultra-high-density of the power module, careful design of field-grading structures inside the bus bar is …
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A microfabricated dielectrophoretic trapping array for cell-based biological assays
… assays on them. The traps use the phenomenon of dielectrophoresis-the force on polarizable bodies in a non-uniform electric field-to make potential energy wells. These potential energy wells are electrically switchable, arrayable, and amenable to batch fabrication. The trapping arrays have …
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Thermal bubble behaviour in liquid nitrogen under electric fields
… behaviour changes in liquid nitrogen (LN2) under electric fields. Cryogenic liquids such as LN2 have been used not only as the coolant but also as the electrical insulator in superconducting and cryogenic apparatus. However, bubbles are easily formed in these liquids by even moderate heating …
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Theoretical and experimental studies of the field-induced phenomena in flowing suspensions
… dilute suspensions subject to high gradient AC electric fields. When a spatially non-uniform electric field is applied to a suspension, in which the particles and the suspending fluid have different dielectric permittivities andlor conductivities, the particles migrate towards the regions of …
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Lab on a chip rare cell isolation platform with dielectrophoretic smart sample focusing, automated whole cell tracking analysis script, and a bioinspired on-chip electroactive polymer micropump
… is the motion of a polarizable particle in a non-uniform electric field. Contactless DEP (cDEP) is a recently developed cell sorting and isolation technique that uses the DEP force by capacitavely coupling the electrodes across the channel. The cDEP platform sorts cells based on intrinsic …
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Enhanced fluidization of nanoparticle agglomerates
… the fluidized bed. Vibration and electrostatic fields were applied to a fluidized bed of nanoparticle agglomerates to observe any changes in bed expansion and flow behavior. Applied vibrational intensities were found to increase the expansion of the fluidized bed, although large bubbles were …
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Marker-Free Isolation and Enrichment of Rare Cell Types Including Tumor Initiating Cells through Contactless Dielectrophoresis
… to manipulate rare cell types based on their electrical signatures using dielectrophoresis (DEP) without having direct contact between the electrodes and the sample, known as contactless dielectrophoresis (cDEP). DEP is the motion of a particle in a suspending medium due to its polarization in …
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Microfluidic differentiation of subpopulations of cells based on their bioelectrical signature
… due to its polarization in the presence of a non-uniform electric field, may also be applied. For instance, well-specified mixing or separation of particles can be achieved by using the combination of drag and dielectrophoretic forces. Two major mechanisms for manipulating particles in a …
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Multi-Kilovolt Gallium Nitride Power Transistors
… role in energy conversion applications including electric vehicles, data centers, consumer electronics, power grids, etc. The evolution of power semiconductor materials has progressed from traditional silicon (Si) to wide-bandgap materials including silicon carbide (SiC) and gallium nitride (GaN). …
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ΘΕΩΡΗΤΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΗΛΕΚΤΡΙΚΗΣ ΕΚΚΕΝΩΣΗΣ ΣΕ ΜΙΚΡΑ ΔΙΑΚΕΝΑ
… TORRS) AND LOW (50 TORRS) PRESSURE. THE APPLIED FIELD IS DETERMINED BY THE ELECTRODE GEOMETRY AND THE EVOLUTION OF POSITIVE AND NEGATIVE IONS AND ELECTRONS ISDESCRIBED BY ONE-DIMENSIONAL CONTINUITY EQUATION IN CONJUCTION WITH THE POISSON'S EQUATIONS WHICH ARE RESOLVED BY AN ACCURATE NUMERICAL …