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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 20 of 30 for “"Conduction mechanisms"”.
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Conduction mechanisms in polyaniline
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1987.
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SIMOX buried-oxide conduction mechanisms
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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NMR studies of conduction mechanisms in electrolyte materials for fuel cells
… In the first part of this thesis charge conduction mechanisms is investigated in ionic conductors. In Chapter 3 19F NMR relaxometry is applied to investigate fluoride ion dynamics in the fluoride conducting superionic material, PbSnF4 and in Chapter 4 1H NMR relaxometry is used to examine …
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Conduction Mechanisms in Smooth Muscle as Revealed by a Comparative Histological Study
Made available in DSpace on 2014-12-05T22:14:34Z (GMT). No. of bitstreams: 1 0015186.pdf: 10013423 bytes, checksum: da0d44c4cfd0145b2db765356d0764d8 (MD5) Previous issue date: 1955
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Transport modeling of simple fluids and nano-colloids : thermal conduction mechanisms and coarse projection
… analysis, the interplay between the molecular mechanisms that govern the variation of the thermal conductivity with volume fraction and solid-fluid interaction is examined. For a specific system of nanosized platinum clusters which interact strongly with host liquid xenon, a significant thermal …
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A Study on the Nature of Anomalous Current Conduction in Gallium Nitride
… Schottky diodes and CAFM. Current-voltage (IV) mechanisms will identify conduction mechanisms on diodes, and CAFM measurements will investigate the microstructure of conduction in GaN thin films. With CAFM, enhanced conduction has been shown to decorate some extended defects and surface …
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Electrical properties of various single-wall carbon nanotube networks
This thesis investigates conduction mechanisms of covalently and non covalently functionalised single wall carbon nanotube (SWCNT) networks. Unlike previous strategies where diamines were used, a novel route to covalently bridge SWCNTs by organic molecular linkers is proposed. The bridging relies …
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Electrical characterization of carbon black filled rubber
… This is in agreement with previous theories of conduction network formation and percolation. Various conduction mechanisms have been enumerated and an equivalent circuit of a network of lumped R-C "microelements'' has been qualitatively described. Stress, relaxation, frequency, and temperature …
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Measurement and Modeling of Blocking Contacts for Cadmium Telluride Gamma Ray Detectors
… to determine the correct model for reverse bias conduction. Understanding conduction mechanisms in these devices will help develop more reproducible contacts, reduce leakage current, and ultimately improve detector performance.
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Molecular dynamics analysis of spectral characteristics of phonon heat conduction in silicon
… technological significance of silicon, its heat conduction mechanisms have been studied extensively. However, there have been some lingering questions surrounding the phonon mean free path and importance of different polarizations. This research investigates phonon transport in bulk crystalline …
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Electrical transport properties of barium titanate-based capacitor ceramics
Electrical conduction mechanisms in BaTiO₃-based ferroelectric capacitor ceramics with an emphasis on the X7R type were studied. Dominant charge carriers in this material were identified as conduction band electrons below a temperature of 850°C. This was substantiated by the following results: …
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Properties and Applications of Amorphous Gallium Arsenide Annealed to a Polycrystalline Form
… all found to be important factors. Different conduction mechanisms were studied, and it was concluded that conduction is due to the formation of rhombohedral arsenic forming in between GaAs grains. These arsenic grains form a network around the GaAs grain structure, creating a conduction path …
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Investigation on thermal conductivity and AC impedance of graphite suspension
… cannot be reproduced. Theoretically, potential mechanisms leading to this enhancement are still under scrutiny. In this thesis, we present experimental studies aiming at understanding heat conduction mechanisms in nanofluids. We use graphite flakes as additives and developed methods to prepare …
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An analysis of the electrical circuit of submerged-arc furnaces
… system has been used in the examination of the conduction mechanisms occurring in a furnace and this has resulted in a significant improvement in the understanding of the operation. In addition, a method for determination of the lengths of the electrodes has been established. A problem with the …
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Ion Implantation and Characterization of High Temperature and High Performance Polymers
… detection analysis (ERDA) methods. Electrical conduction mechanisms in the implanted polymers are discussed in detail based on the results of the temperature dependence of surface conductivity. A dual-hopping conduction model has been introduced to explain the experimental results of these ion …
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Highly Conductive Ultrananocrystalline Diamond Thin Films via Nitrogen Incorporation
… to clarify the roles these factors play in the conduction mechanisms of nitrogen-doped UNCD, near edge x-ray absorption fine structure, electron energy loss spectroscopy, and soft x-ray fluorescence were carried out to ascertain the bonding structure of the films. These measurements indicate …
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A study of the synthesis, structure, and ionic conductivity of sodium and lithium lanthanide pyrosilicates, A3LnSi2O7
… and bond-valence calculations. Potential conduction pathways within the A3LnSi2O7 structures were identified with bond-valence methods and used to propose conduction mechanisms for alkali ion trans- port. Variable temperature impedance spectroscopy measurements were used to show the …
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Electrical studies on new generations of oxide cathodes for CRT applications.
… energy of 1.49, 2.38 eV and 3.3eV. The conduction mechanisms observed a metallic conduction at low temperature (300-500)K after operation for several hundred hours due to improvements in the Ba coverage layer on the grains of oxide layer. The influence of different durations on the …
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