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 43 for “"Applied magnetic fields"”.
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Ultraweak photon emission in cells: coupling to molecular pathways, applied magnetic fields, and potential non-locality
… specific intensity and physiologically patterned magnetic field predicted from a model that applied the concept of magnetic moment to the whole cell resulted in photon emissions. They were detected at distances sufficient to allow intercellular communication. The occurrence of macroscopic …
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The effect of applied fields on crystallisation
… a background on crystallisation, the effects of applied fields and summarises the techniques used for characterisation and analysis. The study of applied magnetic fields was carried out on three crystallising systems (a) sucrose, (b) lactose and (c) cocoa butter. Both sucrose and lactose were …
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Magnetic properties of R2PdSi3 (R = heavy rare earth) compounds
… of the magneto-crystalline anisotropy, also in applied magnetic fields. The results of the observed properties in resistivity, magnetization and susceptibility lead to the summary that these compounds range from interesting to exotic and that their magnetic properties are low dimensional, …
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Resistivity and specific heat measurements near phase transitions in metals
… that the quantities should be proportional in a magnetic system. Measurements of the specific heat and resistivity derivative on the rare earth ferromagnet gadolinium have revealed a previously undetected anomaly in the specific heat along with a peak in the a-axis resistivity derivative at …
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Raman Scattering Studies of the Orbital, Magnetic, and Conducting Phases in Double Layer Ruthenates
… a greater sensitivity of the orbital phases to applied magnetic fields, as evidenced by changes in the phases occurring at lower fields and over a greater field range than seen in the undoped system.
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Time, momentum, spin, and energy resolved tunneling spectrum of a two-dimensional electron system
… systems at low temperatures or in large applied magnetic fields. Furthermore, through the use of pulses that drive tunneling in extremely short time intervals, the technique eliminates perturbations such as heating. Using the pulsed tunneling technique, we visualized the effect of …
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Printing ferromagnetic domains in soft materials : mechanism, modeling, and applications
… This thesis introduces a method of printing ferromagnetic domains in soft materials that yield fast transformation between complex 3D shapes via magnetic actuation. This approach is based on direct ink writing of an elastomer composite containing hard ferromagnetic microparticles. By applying a …
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Design and manufacture of a modular cylindrical apparatus for ferrofluid experimentation
Ferrofluids, colloidal suspensions of coated magnetic nanoparticles inside a carrier fluid, respond to externally applied magnetic fields. This thesis addresses the behavior of these fluids when subjected to an azimuthally rotating uniform magnetic field. In order to test the theory that fluid flow …
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Brillouin scattering investigation of nanomagnetic structures
… dynamical properties of arrays of vertical ferromagnetic nanowires and nanorings, which show great promise as high-density magnetic storage and sensor devices. Three closely related projects are reported: (1) observation of bulk magnon quantization in Ni nanowires: bulk spin wave quantization has …
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Mössbauer investigations of high-spin ferrous heme proteins
… in the high-spin ferrous state is discussed. Paramagnetic hyperfine interactions, induced by strong applied magnetic fields, result in Mössbauer spectra that contain a wealth of information about the symmetry of the active site iron atomo Quantitative evaluation of the data relies on a spin …
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Ferrofluid surface and volume flows in uniform rotating magnetic fields
… and volume effects in uniform dc and rotating magnetic fields are studied. Theory and corroborating measurements are presented for meniscus shapes and resulting surface driven flows, spin-up flows, and Hele-Shaw cell flows and instabilities. To characterize the water-based and oil-based …
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Structural and Electromagnetic Study of Heavily Doped ZR-Added REBCO Coated Conductors Fabricated by Reel-To-Reel MOCVD
… for various large-scale electric power and magnetic applications. The critical current density (Jc) of REBCO coated conductors in a magnetic field is higher than that of any other HTS. However, further Jc enhancement in REBCO coated conductors, particularly in fields perpendicular to the …
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Controlled synthesis and characterization of templated, magneto-responsive nanoparticle structures
Magnetic fluids are colloidal dispersions of magnetic nanoparticles that are stable with respect to gravitational and moderate magnetic fields because of their small particle size, and to unbounded aggregation due to their surface coatings. The interaction between individual magnetic nanoparticles …
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Deceleration Stage Rayleigh-Taylor Instability Growth in Inertial Confinement Fusion Relevant Configurations
… the RT instability and the impact of externally applied magnetic fields on their evolution. Several simulation regimes have been identified that provide novel insight into the impact that a seeded magnetic field can have on RT instability growth and the conditions under which magnetic field …
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A finite element analysis of high kappa, high field Ginzburg-Landau type model of superconductivity
… which is valid for large K and large magnetic field strengths. This model, referred to as the High kappa model, is derived via formal asymptotic expansion of the full, time-dependent Ginzburg-Landau equations. The model accounts for the effects of both applied magnetic fields and …
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A Comparison of Reactivities and Properties of 3,3-Dimethylacrylic Acid, Isovaleric Acid and Their Derivatives
… to their saturated analogs. The same trend applied to α, β-unsaturated amides. As regards the carbon-13 chemical shifts, it was found that all the nuclei of carbonyl carbon atoms in α, β-unsaturated compounds studied in this research resonated at higher applied magnetic fields as compared to …
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Convective Heat Transfer in Quasi-one-dimensional Magnetic Fluid in Horizontal Field and Temperature Gradients
… we studied the convective heat transfer in a magnetic fluid in both zero and applied magnetic fields. The natural convection is observed in a quasi-one dimensional magnetic fluid in a horizontal temperature gradient. The horizontal non-homogeneous magnetic fields were applied across the sample …
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Anisotropy and magnetostriction of GdA12 and related compounds
… between 4.2K and their Curie temperatures in applied magnetic fields up to 2.5T.<br/><br/>Anisotropy constants were measured by means of a torque magnetometer. The methods by which anisotropy constants can be derived from torque curves were investigated using a well-documented single crystal …
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Transgene-free strategies for wireless control of animal physiology using magnetite nanoparticles
… and cause minimal damage to brain tissue. Magnetic fields are an appealing candidate for wireless therapies because at many frequencies and amplitudes, the human body is similar enough in its magnetic response to vacuum that magnetic fields can penetrate arbitrarily deep. When combined with …
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Magnetic Barkhausen Noise Testing: Steel Grades and Stress Response
Magnetic Barkhausen Noise emissions are discontinuous magnetization changes within ferromagnetic materials that have been subjected to changing applied magnetic fields. These emissions are sensitive to microstrutural variations and stress states of the material, which can adversely affect magnetic …
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