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 73 for “"thermal activation"”.
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Thermal activation of superconducting Josephson junctions
… this research was to investigate the effects of thermal activation on the superconducting properties of Josephson junctions. Specifically, thermal noise tends to result in a range of switching currents, values less than the critical current at which a junction switches from the superconducting to …
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Thermal activation and macroscopic quantum phenomena in superconducting devices
… We have measured escape rates due to both thermal activation over the barrier and macroscopic quantum tunneling through the barrier. The measurements were performed for a variety of device parameters, corresponding to different shapes of the potential barrier. We find strong evidence for …
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Thermal activation analysis of cyclic creep in Al-4.6% Mg, A
Includes bibliographical references (pages 137-140).
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Thermal activation, long-range ordering, and topological frustration of artificial spin ice
… of characterization techniques. Recently, thermal activation of ASI systems has been demonstrated, introducing the spontaneous reversal of individual magnets and allowing for new explorations of novel phase transitions and phenomena using these systems. In this work, we introduce a new, …
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Formation of three-dimensional graphene structures by controlled thermal activation of polymeric shape memory substrates
… (3D) texturing of graphene and graphite by using thermally-activated shape-memory polymers as the underlying substrate and the material characterizations thereof. Uniform, large area arrays of textured 3D graphene crumple features can be created on the centimeter scale by controlling simple …
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Examination of two remarkable AAA+ proteases: unraveling substrate-enzyme interactions of the double-ringed ClpAP and direct thermal activation of HslUV proteolysis
AAA+ (ATPases associated with diverse cellular activities) proteases are degradation enzymes, which together with other molecular machines, including disaggregases and chaperones, are critical to the maintenance of cellular protein homeostasis. Different members of this quality control network …
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Photon-induced vortex-antivortex pair creation in superconducting films
… pairs by single photon absorption and by thermal activation. The major objective for this experiment is to investigate the possibility of photon-induced vortex-antivortex pair creation.
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Multinuclear Nuclear Magnetic Resonance Studies of Model Inorganic Systems (Nmr)
… most consistent with the data as products after thermal activation.
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Performance and mechanism on a high durable silica alumina based cementitious material composed of coal refuse and coal combustion byproducts
… utilize this huge amount of solid waste through activation as substitute for ordinary Portland cement. The central goal of this dissertation is to investigate and develop a new silica-alumina based cementitious material largely using coal refuse as a constituent that will be ideal for durable …
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Mechanochemical Triggers for Self -Healing Polymers
… induces ring opening at 10°C, whereas thermal activation only took place at temperatures over 105°C. It was found that the substitution pattern around the four-membered ring influenced the rotational preference for ring opening. 13C labeling studies indicate that while the trans …
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Reaction Synthesis of Titanium Aluminide / Titanium Diboride in-Situ Composites
… synthesis is a processing technique where the thermal activation energy needed to form a compound is provided by the exothermic heat of formation of the thermodynamically stable product. This type of synthesis has been used to form a variety of ceramics, intermetallics, and in-situ composites. …
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Novel applications of a 4-DMAP-derived organic electron donor under photoactivation
… to a number of electron transfer reactions under thermal activation in the Murphy group. The research programme focuses on the photoactivation of the donor 1 and its novel applications in achieving more demanding electron-transfer reactions. Chapter Two highlights the enhanced reducing power of …
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Dynamics in neutron stars and the early universe
… Vortices overcome their pinning barriers through thermal activation or quantum tunneling, and ""creep"" slowly outward under forces created by the superfluid flow. To the extent that vortices remain pinned, the superfluid retains its angular momentum as the crust slows through interactions with …
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Degradation mechanisms of barium titanate based thick film capacitors
… voltage dependence. Voltage independence of thermal activation energy and time dependence of a leakage current have been observed. A healing effect by reversal of bias polarity and humidity effect on leakage current have also been studied. The 3/2 power voltage dependence can be attributed to …
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A iron-57 Moessbauer study on the thermal oxidation of iron in biotite mica.
… time-wise bottleneck step that follows a classic thermal activation law and (ii) a certain fraction of the original Fe$\sp{2+}$ is inaccessible to the oxidation reaction. The resulting barrier energy, $\rm E\sb{b} = 2.36\sbsp{-.02}{+.01}$ eV is in the range of measured barrier energies for …
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Photoluminescence Measurement on Low-temperature Metal Modulation Epitaxy Grown GaN
… cap layer, which was not observed before. The thermal activation energy of this peak is determined to be 33meV. Emission at this energy in previous GaN material has been shown to be the result of stacking faults. We believe this peak in the MME GaN is also the result of stacking faults. In …
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Investigation of Negative Differential Resistance Phenomena in Quantum Well Heterostructures
… different scattering mechanisms and carrier thermal activation phenomena, respectively.</p> <p>Deep level noise spectroscopy (DLNS) was used to investigate and probe the materials for the presence of defects and impurity states, which were needed to achieve the RST. The pulsed I-V …
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Atomistic simulation of defect structure evolution and mechanical properties at long time scales
… the capabilities of a recently developed activation-relaxation based atomistic method to enhance the accuracy of kinetic predictions, and to enable the investigation of dislocation-defect interactions dynamically at long time scales. We took the Autonomous Basin Climbing (ABC) method as a …
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Molekulinių spinduolių optimizacija naujos kartos organiniams šviestukams /
… of molecular emitters was offered, where the thermal activation of triplet excitons are used for the reversible intersystem crossing, leading to 100% of internal quantum efficiency. Efficiency of those TADF OLEDs is the same as of phosphorescent ones, however with much higher lifetime. Despite …
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Optimization of molecular emitters for new generation OLEDs /
… of molecular emitters was offered, where the thermal activation of triplet excitons are used for the reversible intersystem crossing, leading to 100% of internal quantum efficiency. Efficiency of those TADF OLEDs is the same as of phosphorescent ones, however with much higher lifetime. Despite …
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