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 23 for “"Dc Field"”.
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Chaos effects in one-dimensional hydrogen, including the high-frequency regime
… excited hydrogen in combined strong ac and dc electric fields is examined. It is shown that the production and maintainence of effectively one-dimensional states is plausible in this system. The threshold of global classical chaos is calculated using the resonance overlap method. In the …
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Electrooptic electric field sensor for dc and extra-low-frequency measurement
… the development of an electrooptic sensor for DC and extra low frequency electric field measurement. Available cubic electrooptic crystals were compared from the sensor sensitivity point of view. A new figure of merit was used taking into account the attenuation of the electric field in the …
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Terahertz oscillations of hot electrons in graphene
Once a uniform electric field is turned on in graphene, carriers accelerate ballistically until they are scattered by optic phonons and the process repeats itself. In this dissertation, I will show that the oscillatory nature of the motion of the carrier distribution function manifests in damped …
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THE EFFECTS OF A LARGE OSCILLATING FIELD IN MAGNETIC RESONANCE; A STUDY BY LOW FREQUENCY DOUBLE ELECTRON MUON RESONANCE
… behave in magnetic resonance when the applied dc field and the rf oscillating field have comparable amplitudes. A technique called Double Electron Muon Resonance has recently been applied to fused quartz at low frequency enabling us to see directly how the spin precesses in perpendicular dc and …
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Electrical and optical effects in hybrid liquid crystal cells
… and different amplitudes of applied electric field be understood. In order to achieve enhanced electro-optic and photorefractive response, nano size ferroelectric particles were added in of low concentration to different nematic liquid crystals; BaTiO<sub>3</sub> and …
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The effects of pulsed static and oscillating magnetic fields on rat pineal serotonin N-acetyltransferase activity
… possible hazardous effects of electromagnetic fields (EMF ' s) has resulted in attempts to address this issue. Several authors have shown that EMF exposure affects biological systems and more specifically the pineal enzyme, serotonin N-acetyltransferase (SNAT), inhibiting the enzyme and thus …
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AC loss in MgB2-based fully superconducting electric machines
… propulsion. Superconductors exhibit zero loss in dc conditions, though ac current produces considerable loss due to hysteresis, eddy currents, and coupling. For this reason, many present designs for such machines are partially superconducting, meaning that the dc field components are …
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Technologya nd Protocolsf or Translational Researchin ElectricalS timulation
… like transcranial direct currents stimulation (tDCS) have been demonstrated to modulate neural function. Weak constant current is applied via scalp electrodes leading to subthreshold changes in neuron membrane potentials. Neuromodulation of the cortex using direct current (DC) stimulation may be …
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Radio frequency driven direct current electron beam source
… of the plasma sheath provides the effective DC field for both ion impingement and electron beam acceleration. The electron beam energy spectra are measured at a location 14 cm from the cold cathode using a differentially pumped retarding potential analyzer. The measured electron beam energy …
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Effects of Electric Fields on Forces between Dielectric Particles in Air
… microscopy (AFM) to study the effects of both DC and AC external electric fields on the forces between two dielectric microspheres. In this work we measured the DC and AC electric field-induced forces and adhesion force between two barium titanate (BaTiO?) glass microspheres in a low humidity …
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Electric birefringence studies of biopolymer systems
… of immediate significance in the biomedical field are reported on a family of materials which form the major constituents of the cartilage connective tissue. Outstanding amongst the reported results is the confirmation of the Hardingham-Muir model for proteoglycan-hyaluronic acid aggregation, …
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The Effects of Annealing URu2Si2 on the Resistivity and Meissner Effect
… considerable effects on the resistivity and the DC magnetization. The effects of annealing on the resistivity are characterized by examining how the Residual Resistivity Ratio (RRR), the fitting parameters to an expression for the temperature dependence of the resistivity, the temperatures of the …
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Wafer-scale integrated active silicon photonics for manipulation and conversion of light
… symmetry of silicon is broken with an applied DC field, generating second-order nonlinear susceptibility in CMOS compatible silicon photonics platform. The field induced second-order nonlinear effects are demonstrated in the form of DC Kerr effect and second harmonic generation in silicon.
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Towards Multifunctional Materials based on Coordination Complexes of Sulfur-Containing Diarylazo and Cucurbit[6]uril Ligands
… and/or electronic changes with temperature. DC magnetic studies on 4c and 5a reveal the expected LT χMT values, however RT χMT values increase to 0.75 cm3Kmol-1 and 0.54 cm3Kmol-1, respectively. The second project explores the hydrothermal synthesis of Ln4-cubane sandwich-type structures from …
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Transition-Edge Sensors for Electron Spectroscopy
… remarkably little attention, notably within the field of electron spectroscopy where TESs could provide significant advantages over existing electron spectrometers. In this thesis, I present the first investigation into the capabilities of TESs in electron spectroscopy using a combination of …
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Electric Field Effects on Bacterial Deposition and Contaminant Sorption as Drivers of Bioavailability
… with environmental matrices. Direct current (DC) electric fields and their electrokinetic phenomena (electro-migration, electroosmosis, and electrophoresis) have the potential to promote contaminant bioavailability by both mobilizing bacteria and contaminants. This thesis hence tested …
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Ligand Design for Dual Property Single Molecule Magnets
… single molecule magnet (SMM) behaviour in zero dc field and the energy barriers and associated pre-exponential factors for each relaxation process have been determined. Low temperature solid state photoluminescence studies reveal that both complexes are emissive; however, the f-f transitions …
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Chemically modified Ta₂O₅ thin films for dynamic random access memory (DRAM) applications
… were found to be 4.5 x 10⁷ A/cm² in a 1MV/cm dc field which decreased to 3.4 x 10⁸ A/cm² for 10% Al modified Ta₂O₅ thin films. A typical dielectric constant of 42.5 was obtained for 10% Al modified Ta₂O₅ thin films. This is significantly higher compared to the commonly reported dielectric …
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Lanthanide-based single-molecule magnets: A rational design by chemical intuition
… on the contribution of covalency, crystal field effect and the role of aromaticity in stabilizing the excited magnetic levels of a single-molecule magnet. Dy1 showed frequency-dependent slow magnetic relaxation characteristics of a single-molecule magnet with and without applied dc field …
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Resistive-type Superconducting Fault Current Limiter (RSFCL) and Its Application in Power Systems
… experiments were performed to study the magnetic field-angular dependence of the critical current of different commercial YBCO samples. We selected ten 2G-HTS tapes with broad differences in width, fabrication process, and laminar structure. The obtained I_c (B,θ) characteristics of HTS samples …
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