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Differences in electrical impedance measurements due to guarded/unguarded electrodes in homogeneous/inhomogeneous regionsReed, Wen-Yin F. January 2011 (has links)
Typescript (photocopy). / Digitized by Kansas Correctional Industries
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A method of generating n-branch Millman networksTeichgraeber, Richard D. January 1966 (has links)
LD2668 .T4 1966 T262 / Master of Science
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Impedance based integrated circuits for biological sensingMa, Hanbin January 2014 (has links)
No description available.
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Systematic realization of negative impedance converter and its application to the synthesis of driving-point nonlinearcharacteristic劉金城, Lau, Kam-shing. January 1973 (has links)
published_or_final_version / Electrical Engineering / Master / Master of Philosophy
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Sensitivity and specificity of tympanometric norms for Chinese preschool children霍曉澄, Fok, Hiu-ching, June. January 2008 (has links)
published_or_final_version / Speech and Hearing Sciences / Master / Master of Science in Audiology
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Fundamental study on characterization of porous media using impedance spectroscopyMak, Shiu-wai., 麥兆偉. January 2009 (has links)
published_or_final_version / Civil Engineering / Master / Master of Philosophy
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Impedance determination of a RF plasma discharge by external measurementsKrautschik, Christof Gabriel, 1957- January 1989 (has links)
The equivalent impedance of a RF plasma was experimentally determined by monitoring the voltage and current waveform for different input powers in real time. Average ion energies and fluxes were determined by a computer model which takes ion collisions in the sheath regions into account. In addition two models were proposed which explain how RF energy is converted to DC potential energy in the sheath. Etch rates of Si in a CF₄ discharge were also evaluated and related to the measurements.
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The relationship between motility and gastrointestinal transit of tabletsMitchell, Catherine Lindsay January 1996 (has links)
No description available.
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Development of novel reconstruction algorithms for induced current impedance imagingBouallouche, Amar January 1996 (has links)
No description available.
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Mise en forme de silicates de lanthane par projection plasma pour les piles à combustible à oxyde solide fonctionnant à température intermédiaire / Plasma spraying of lanthanum silicates electrolyte for intermediate temperature solid oxide fuel cellDru, Sophie 23 November 2010 (has links)
Ce travail est consacré à l’élaboration par projection plasma à la pression atmosphérique, et à la caractérisation, de couches d’électrolyte en apatite de type La9Sr1Si6O26,5 pour les piles à combustibles à oxyde solide (SOFC) fonctionnant à température intermédiaire (700 °C). Dans un premier temps, ce travail a porté sur le choix des conditions opératoires permettant l’élaboration de dépôts denses d’apatite, caractéristique essentielle d’un électrolyte. Il est apparu que l’utilisation de mélanges plasmagènes à enthalpie et conductivité thermique élevées ainsi qu’un faible débit massique, soit favorable à l’obtention des dépôts les plus denses. Les deux techniques de frittage essayées (le frittage conventionnel et le frittage par « Spark Plasma Sintering ») ont conduit à la cristallisation et à la densification des dépôts, permettant ainsi d’améliorer leurs propriétés électrochimiques. L’augmentation de conductivité ionique est particulièrement notable pour les dépôts réalisés avec des conditions de projection très énergétiques et frittés de manière classique sous air. La conductivité ionique atteint 1,3.10-3 de Ω-1.cm-1 à 700 °C. Dans un second temps, les nickelates de type (La2, Nd2 et Pr2)NiO4+δ ont été étudiés comme matériau de cathode. Leurs compatibilités avec l’électrolyte en apatite ont été vérifiées et leurs températures de frittage ont été optimisées pour obtenir une microstructure suffisamment poreuse. Les meilleures performances électrochimiques sont ainsi obtenues pour les cathodes Pr2NiO4+δ frittées à 1100 °C dont l’ASR (Area-Specific Resistivity) est de 0,2 Ω.cm2 à 700 °C. / This study deals with the elaboration by atmospheric plasma spraying process and the characterization of La9Sr1Si6O26,5 lanthanum silicates electrolyte for SOFC cell working at intermediate temperature (700 °C). In a first step, this work has been devoted to choose the plasma spraying conditions to elaborate dense apatite coatings, fundamental characteristic of an electrolyte. It has been observed that the use of plasma mixture with high enthalpy and thermal conductivity, as well as low gas flow rate, favours dense apatite coatings formation. However, to ensure a sufficient density of the coating while keeping their composition, it is necessary to add a sintering step. The two sintering techniques tested (conventional sintering and Spark Plasma Sintering) have leaded to the coatings crystallization and densification, thus permitted to improve their electrochemical properties. Particularly, a high ionic conductivity increase has been observed for sintered coatings elaborated with high power plasma spraying conditions. The ionic conductivity reaches 1.3.10-3 de Ω-1.cm-1 at 700 °C. In a second step, (La2, Nd2 et Pr2)NiO4+δ type nickelates materials have been studied as cathode. Their compatibility with apatite electrolyte was demonstrated and their sintering temperature was optimized in order to obtain sufficiently porous microstructure. The best electrochemical results were reached with Pr2NiO4+δ cathodes sintered at 1100 °C presenting a 0.2 Ω.cm2 ASR (Area-Specific Resistivity) at 700 °C.
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