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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 18 of 18 for “"electric field gradients"”.
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Electric field gradients in copper alloys
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-03-02T21:38:42Z No. of bitstreams: 1 1974_whalley.pdf: 2101323 bytes, checksum: 6c2a3629b0bc84f49541dc7330f6f81b (MD5)
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Particle Manipulation Using Electric Field Gradients in Microdevices
… within a liquid in response to an external electric field. Using the intrinsic electrical properties of bacteria and of breast cancer cells, electrokinetics can be used to manipulate these particles for two different types of applications: tissue engineering and breast cancer detection. The …
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Electrochemically generating electric field gradients in the absence of buffer for membrane-free separations
… work described herein focuses on modulating the electric field within microelectrochemical devices for electrokinetic separations. Specifically, two new electrochemical approaches were investigated for forming electric field gradients which are useful for manipulating ion motion. The first method …
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REPEATED BIPHASIC CONDUCTING CONDUITS FOR PERIPHERAL NERVE REPAIR
… focused on methods to accelerate axon outgrowth. Electrical stimulation studies have accelerated axon outgrowth up to three times the normal rate for up to 48 hours and have shown electric fields up to 600 um were able to direct and accelerate axon outgrowth across the gap. These data led to the …
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Investigation of quantum information storage in rare earth doped materials
… interest in quantum information processing the field has now reached the point where a quantum memory is becoming a real necessity for further improvements. A quantum memory is fundamentally different from a classical memory due to the "Superposition" principle. Unlike classical information no …
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Investigation of quantum information storage in rare earth doped materials
… interest in quantum information processing the field has now reached the point where a quantum memory is becoming a real necessity for further improvements. A quantum memory is fundamentally different from a classical memory due to the "Superposition" principle. Unlike classical information no …
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Manipulation of bacteria using three dimensional insulator based dielectrophoresis
… for sorting microparticles based on their electrical properties. By using constrictions in a microchannel to generate large electric field gradients, the need for microfabricated electrode arrays is eliminated. In this work, three-dimensional insulator-based dielectrophoresis (3DiDEP) …
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Computational and NMR Investigations of Protein Structure
… mu, electrostatic potentials, phi( r), and electric field gradients, ∇E is established. These calculated properties are then used to investigate the nature of bonded and nonbonded interactions in proteins. In the culmination of this effort protein hydrogen bonds are described in terms …
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Single molecule analysis of DNA electrophoresis in microdevices
… of long DNA molecules, and the induced electric field gradients from obstacles and changes in channel dimensions. Using single DNA fluorescence microscopy, we have investigated many of the governing physical mechanisms at play in these gene mapping microfluidic devices. For example, we …
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Development of a Dielectrophoresis-Based Cancer-Cell Analysis Tool
… dielectrophoresis, a method that uses applied electric fields in a microfluidic device to separate cells by biophysical phenotype. By optimizing force balancing between the dielectrophoretic force and the drag force on cells in the device, and by using cell-size pillars to maximize electric …
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Micro-led based optoelectronic tweezers
… tweezers uses light patterns to generate electric field gradients to trap and manipulate single cells. Micro-LEDs offer an advantageous alternative to current illumination sources used in this technique, and indeed other light-based micro-systems, in terms of a compact design and control …
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Nanowire sharpening : application to field ionization
Nanowires show potential for a wide range of fields, from developing next generation solar cells, to detecting viruses, to field ionizing gasses. Their uses in such disparate fields are due to the extreme flexibility in which nanowires can be manufactured and customized to order. The heart of a …
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Structure and motion of charge density waves, and NMR study of NbSe3
… where no COW's are present, an orientation and field-dependence NMR study is presented. Three Nb NMR sites are identified, and associated with the three known structural sites, through the symmetry of the NMR shifts. Numerical calculations of the electric field gradients are also presented. …
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UV Induced Processes in Biomolecules, Hydrated Clusters and Stark Deflected Beams
… radiation-induced processes. Stark deflection in electric field gradients offers a powerful method to address this challenge and has previously been used to select specific polar species from mixed pulsed supersonic beams. However, the low pulsing frequencies of such beams are unsuitable to study …
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The application of FEM technique to electromagnetic models for magnetic neural stimulation
… is to explore four factors which affect induced electric fields: 1) magnetic coil diameter, 2) anisotropic tissue conductivity, 3) inhomogeneous tissue conductivity and 4) finite tissue volumes. All results are analyzed in terms of the second space derivative of the potential along the nerve …
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Characterization of semiconductor nanocrystals using advanced solid-state NMR spectroscopy
… environment by measuring chemical shifts or electric field gradients (EFG) and enables the connectivity/proximity of different chemical sites to be ascertained via scalar couplings or dipolar couplings. Most of the elements found in main-group inorganic semiconductors have NMR-active nuclei, …
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Facilitating the Clinical Translation of Flash Radiotherapy Through Dosimetry Development and Beam Parameter Optimization
… sub-mm electrode spacings at sufficiently high electric field gradients (≥ 1000 V/mm) will be able to in accurately measuring dose delivered from electron FLASH beamlines, and bring dosimetric calibration and reporting up to the standards necessary for clinical translation and subsequent …