Thesis (Ph.D.) -- University of Adelaide 1998. / Photocopy. Errata slip inserted. Bibliography: p. 445-466.

Thesis (M.S.)--University of Wyoming, 2009. / Title from PDF title page (viewed on July 1, 2010). Includes bibliographical references (p. 143-145).

No description available.

Master of Science / Department of Architectural Engineering and Construction Science / Kimberly Waggle Kramer / Insulated precast concrete sandwich panels are commonly used for exterior cladding on a building. In recent years, insulated tilt-up concrete sandwich panels are being used for the exterior load-bearing walls on a building. The insulation is sandwiched between exterior and interior concrete layers to reduce the heating and cooling costs for the structure. The panels can be designed as composite, partially composite, or non-composite. The shear ties are used to achieve these varying degrees of composite action between the concrete layers. A parametric study analyzing the standard, solid single-wythe tilt-up concrete wall panel and solid sandwich (double-wythe separated by rigid insulation) tilt-up concrete wall panels subjected to eccentric axial loads and out-of-plane seismic loads is presented. The sandwich tilt-up panel is divided into two categories – non-composite and composite wall panels. The height and width of the different types of tilt-up wall panel is 23 feet (21 feet plus 2-foot parapet) and 16 feet, respectively. The solid standard panel (non-sandwich) is 5.5 inches in thickness; the non-composite sandwich panel is composed of 3.5-inch architectural wythe, 2.5-inch rigid insulation, and 5.5-inch interior load bearing concrete wythe; and the composite sandwich panel is composed of 3.5-inch exterior, load bearing concrete wythe, 2.5-inch insulation, and 5.5-inch interior, load bearing concrete wythe. The procedure used to design the tilt-up wall panels is the Alternative Method for Out-of-Plane Slender Wall Analysis per Section 11.8 of ACI 318-14 Building Code Requirements for Structural Concrete and Commentary. The results indicated that for the given panels, the applied ultimate moment and design moment strength is the greatest for the composite sandwich tilt-up concrete panel. The standard tilt-up concrete panel exhibits the greatest service load deflection. The non-composite sandwich tilt-up concrete panel induced the greatest vertical stress. Additionally, the additional requirements regarding forming materials, casting, and crane capacity is covered in this report. Lastly, the energy efficiency due to the heat loss and heat gain of sandwich panels is briefly discussed in this report. The sandwich tilt-up panels exhibit greater energy efficiency than standard tilt-up panels with or without insulation.

L'effet magnétoélectrique (ME) est la modification de la polarisation électrique par l'application d'un champ magnétique (effet ME direct), ou bien la modification de l'aimantation magnétique par l'action d'un champ électrique (effet ME inverse).L'utilisation de matériaux composites permet de reproduire de manière extrinsèque cet effet. Le couplage mécanique entre des matériaux magnétostrictifs et piézoélectriques fournit un effet ME extrinsèque plus important à température ambiante que celui fournit intrinsèquement. Nous avons dégagé (théoriquement et expérimentalement) différentes caractéristiques de matériaux nécessaires à l'obtention d'un effet ME important et justifé l'utilisation de ferrite et de PZT dans les composites ME. Nous expliquons dans cette thèse, les méthodes de fabrications des différentes géométries de composites étudiées (empilement de couches ou bien inclusions d'une phase dans l'autre). En particulier, l'utilisation du frittage non conventionnel par Spark Plasma Sintering, pour améliorer le couplage mécanique y est abordée. En nous focalisant sur la géométrie en multicouche, nous avons montré l'importance de facteurs tels que le champ démagnétisant ou encore la symétrie de la structure. Nous présentons un prototype de capteur de courant utilisable en génie électrique. Nous en avons montré sa bonne linéarité et sensibilité, mais aussi ses défauts en terme de bande passante. / The magnetoelctric (ME) response consists in the modification of the electric polarization by an applied magnetic field (direct effect) or the modification of the magnetic polarization by an applied electric field (inverse effect). Intrinsic multiferroics are rather uncommon and the effect is often weak at room temperature. An alternative route to achieve ME effect, consists in using magnetostrictive and piezoelectric materials and coupling the two phases by mechanical stress. We draw (theoretically and experimentally) some material characteristics to achieve an importantME effect, which justify the use of ferrite and PZT. We describe the production process of the two studied connectivity schemes (stack of layers or inclusion of a phase in another). We focus on the sintering by Spark Plasma Sintering as a potential improvement of the mecanical bonding. We devoted a part of our work on multilayer composite and showed the importance of some factors such as the demagnetizing effect or the symmetry of the structure. We introduce a current sensor prototype suitable for electrical engineering application. We showed its good linearity and sensitivity but also some effects of its bandwidth.

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published_or_final_version / Dentistry / Master / Master of Dental Surgery

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No description available.