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Showing 351 to 360 of 2528 (0.053 seconds)| 351 |
NOUVELLE APPROCHE DE LA MÉTHODE DE D-BAR POUR LA RÉSOLUTION DU PROBLÈME DE CONDUCTIVITÉ INVERSEEl Arwadi, Toufic 23 June 2010 (has links) (PDF)
Le problème de conductivité inverse est la traduction mathématiques de l'impédance par tomographie électrique , qui est un problème mal posé , introduit en 1980. Le but est de reconstruire la conductivité d'un matériel ou organe en utilisant les mesures faites au bord (dite la donnée de Cauchy). A.Nachman et Brown-Uhlmann ont montré l'existence et l'unicité de ce problème en utilisant la méthode de Beals et Coifman. Les méthodes de Nachman, Brown-Uhlmann (modifiée ensuite par Knudsen-Tamasan) sont décomposées en deux étapes : calcul des transformées scattering par la donnée de Cauchy ensuite le calcul de la conductivité en utilisant la transformée scattering. Dans cette thèse on développe des approximations des transformées scattering et on montre les stabilités des méthodes D-Bar via ces approximations. On étudie les erreurs de ces approximations. Finalement on explique comment calculée la conductivité numériquement. Plusieurs exemples sont données
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Eddy current losses in a conducting shaft rotating in a magnetic fieldJanuary 1946 (has links)
by N.H. Frank. / "November 20, 1946." / Army Signal Corps Contract No. W-36-039 sc-32037.
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Conductivity of metallic surfaces at microwave frequenciesJanuary 1947 (has links)
E. Maxwell. / Reprinted from Journal of applied physics, v. 18, no. 7, July, 1947. / Includes bibliographical references.
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Proton conducting polymer composite membrane development for Direct Methanol Fuel Cell applications.Luo, Hongze. January 2008 (has links)
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<![endif]--><span style="font-size: 12pt / font-family: " / Times New Roman" / ," / serif" / ">The objective of this study was thus to prepare highly proton condictivity membranes that are cheap to manufacture and have low methanol permeability.   /   / </span></p>
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Thermal Conductivity of Nanocrystalline NickelWang, Shize 04 January 2012 (has links)
The grain-size dependences of thermal conductivity and electrical resistivity of polycrystalline and nanocrystalline nickel were measured by the flash method and four-point probe method, respectively. Nanocrystalline nickel was made by the pulsed-current electrodeposition process, while polycrystalline nickel was commercially available Ni 200 in annealed condition. The grain sizes of the materials examined ranged from 28 nanometers to 57 micrometers. Noticeable changes in thermal conductivity and electrical resistivity with grain size were observed in particular for samples with grain sizes less than 100 nm. These results can be explained on the basis of the rapid increase in the intercrystalline grain boundary and triple junction volume fractions at very small grain sizes. The relationship between thermal conductivity and electrical resistivity of nanocrystalline nickel follows the classic Wiedemann-Franz law.
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Thermal Conductivity of Nanocrystalline NickelWang, Shize 04 January 2012 (has links)
The grain-size dependences of thermal conductivity and electrical resistivity of polycrystalline and nanocrystalline nickel were measured by the flash method and four-point probe method, respectively. Nanocrystalline nickel was made by the pulsed-current electrodeposition process, while polycrystalline nickel was commercially available Ni 200 in annealed condition. The grain sizes of the materials examined ranged from 28 nanometers to 57 micrometers. Noticeable changes in thermal conductivity and electrical resistivity with grain size were observed in particular for samples with grain sizes less than 100 nm. These results can be explained on the basis of the rapid increase in the intercrystalline grain boundary and triple junction volume fractions at very small grain sizes. The relationship between thermal conductivity and electrical resistivity of nanocrystalline nickel follows the classic Wiedemann-Franz law.
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| 357 |
Effective Thermal Conductivity of Composite Fluidic Thermal Interface MaterialsKarayacoubian, Paul January 2006 (has links)
Thermally enhanced greases made of dispersions of small conductive particles suspended in fluidic polymers can offer significant advantages when used as a thermal interface material (TIM) in microelectronics cooling applications. A fundamental problem which remains to be addressed is how to predict the effective thermal conductivity of these materials, an important parameter in establishing the bulk resistance to heat flow through the TIM. <br /><br /> The following study presents the application of two simple theorems for establishing bounds on the effective thermal conductivity of such inhomogeneous media. These theorems are applied to the development of models which are the geometric means of the upper and lower bounds for effective thermal conductivity of base fluids into which are suspended particles of various geometries. <br /><br /> Numerical work indicates that the models show generally good agreement for the various geometric dispersions, in particular for particles with low to moderate aspect ratios. The numerical results approach the lower bound as the conductivity ratio is increased. An important observation is that orienting the particles in the direction of heat flow leads to substantial enhancment in the thermal conductivity of the base fluid. Clustering leads to a small enhancement in effective thermal conductivity beyond that which is predicted for systems composed of regular arrays of particles. Although significant enhancement is possible if the clusters are large, in reality, clustering to the extent that solid agglomerates span large distances is unlikely since such clusters would settle out of the fluid. <br /><br /> In addition, experimental work available in the literature indicates that the agreement between the selected experimental data and the geometric mean of the upper and lower bounds for a sphere in a unit cell are in excellent agreement, even for particles which are irregular in shape.
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| 358 |
Effective Thermal Conductivity of Composite Fluidic Thermal Interface MaterialsKarayacoubian, Paul January 2006 (has links)
Thermally enhanced greases made of dispersions of small conductive particles suspended in fluidic polymers can offer significant advantages when used as a thermal interface material (TIM) in microelectronics cooling applications. A fundamental problem which remains to be addressed is how to predict the effective thermal conductivity of these materials, an important parameter in establishing the bulk resistance to heat flow through the TIM. <br /><br /> The following study presents the application of two simple theorems for establishing bounds on the effective thermal conductivity of such inhomogeneous media. These theorems are applied to the development of models which are the geometric means of the upper and lower bounds for effective thermal conductivity of base fluids into which are suspended particles of various geometries. <br /><br /> Numerical work indicates that the models show generally good agreement for the various geometric dispersions, in particular for particles with low to moderate aspect ratios. The numerical results approach the lower bound as the conductivity ratio is increased. An important observation is that orienting the particles in the direction of heat flow leads to substantial enhancment in the thermal conductivity of the base fluid. Clustering leads to a small enhancement in effective thermal conductivity beyond that which is predicted for systems composed of regular arrays of particles. Although significant enhancement is possible if the clusters are large, in reality, clustering to the extent that solid agglomerates span large distances is unlikely since such clusters would settle out of the fluid. <br /><br /> In addition, experimental work available in the literature indicates that the agreement between the selected experimental data and the geometric mean of the upper and lower bounds for a sphere in a unit cell are in excellent agreement, even for particles which are irregular in shape.
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| 359 |
Electrical resistance of paperDeutschman, Archie John, Jr. 01 January 1943 (has links)
No description available.
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| 360 |
The thermal conductivity of dry and partially saturated fiber bedsMcMaster, David Gerald 01 January 1963 (has links)
No description available.
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