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 8 of 8 for “"Bulk Resistivity"”.
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Investigation on Ammonium Perchlorate Based Electrically Controlled Propellants
… resulted in an apparent increase in the bulk resistivity of the propellant which was attributed to enhanced bubble/gas formation at the cathode. The increase in apparent bulk resistivity resulted in enhanced joule heating and a shift in ignition mechanism from predominately …
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Durability Assessment and Service Life Prediction of Concrete in Extreme Aggressive Environment
… between chloride diffusion rates and concrete resistivity. By identifying these correlations and based on the target service life, the research aims to set appropriate thresholds for Surface Resistivity (SR) and Bulk Resistivity (BR) tests, which will be used to qualify concrete mixes used in …
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CHARACTERIZATION OF DOPED GALLIUM NITRIDE SUBSTRATES
In this thesis the characteristics of five bulk semi-insulated doped gallium nitride samples provided by Kyma Technologies, Inc were explored. The five GaN samples were grown on sapphire substrates by hydride vapor phase epitaxy (HVPE) and doped with different concentrations of iron, hydrogen, …
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Characterization of electrical conductivity of carbon fiber/epoxy composites with conductive AFM and scanning microwave impedance microscopy
… two techniques. C-AFM was used to measure the bulk resistivity of IM7 fibers at (1.9 ± 1.1) x 10-3 Ω∗cm. Given that the uncertainty of these measurements is rather large, implementation of calibration experiments is needed. sMIM experiments revealed large nano-scale spatial variations in the …
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Fabrication of metallic nanostructures from sputtered nanocluster precursors
… up to 1100 C. At each annealing step, the resistivity of the cluster device was measured and electron micrographs were taken of the cluster depositions. Nanoclusters have been studied for decades because of the unique properties they display that are somewhere between bulk materials and …
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Electrically insulating phosphate coatings for iron powder based electromagnetic core applications
… temperatures ranging from 315°C to 5400°C. The bulk composition of oxygen and phosphorus are also tested for each heat treatment. Results indicate that after high temperature heat treatments (required for stress reduction, sintering, increased magnetic permeability, and decreased coercivity), …
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Electrical properties of polyimides modified with metal salts
… properties, and extremely high electrical resistivity, are utilized in aerospace, electronic, and specialty consumer markets. However, in some applications, lower electrical resistivity is preferable. Toward this goal, polyimide films have been modified with metal salts and metal complexes. …
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Development of a new test protocol for the permit Ion migration test
… other indirect methods, such as the electrical resistivity test. <br/><br/>By following the principle of the migration test, a new in situ migration test (called the Permit ion migration test) was developed at Queen's University Belfast in the late 90s. The validity of this test was established …