Brick. A simple object, but one that has been a base unit of architecture for over 6000 years. It carries connotations of labour, of energy, of the fundamental desire of humanity to give form to the substance of the Earth. However, current tendencies in manufacturing and construction are challenging the prevalence of the traditional brick-and-mortar system. Automated manufacturing, large-scale prefabrication, and digital simulation are becoming standard practices. This thesis posits that although brick must adapt to a changing architectural climate, contemporary construction should also learn from the versatility and poetics of this timeless material. Starting from clay, I make and inhabit a shelter of brick. My interaction with the material serves as grounding for a wider discussion of its role in architecture today.

Antennas are designed to radiate or receive electromagnetic waves in the part of transmitting or receiving system. They are transducers which transform electric energy into waves so as to radiate radio waves, that¡¦s the primary purpose of antennae. Utilizing the characteristics of helical antennae operating in the axial mode including high directivity, broad bandwidth and circular polarization in satellite communication (ex. GPS) is detailed described in this thesis. The microwave dielectric ceramic material becomes very popular in satellite and wireless communication in recent years because of its high-K, high-Q,and stable-temperature-coefficient characteristics.Our study also utilizes its feature of high dielectric coefficient to shrink the size of the antenna significantly. In this study, we fabricate and analyze the antenna combining the advantages of the helical antenna and the microwave dielectric ceramic material.

Reproduction de : Thèse de doctorat : informatique : Grenoble, INPG : 1988. / Titre provenant de l'écran-titre. Bibliogr. p. 133-137.

Reproduction de : Thèse de doctorat : Sciences de l'ingénieur : Metz : 1995. / Titre provenant de l'écran-titre. Notes bibliographiques. Index.

Thèse de doctorat : Sciences et ingénierie des matériaux : Paris Est : 2008. / Titre provenant de l'écran-titre.

Diss.--Univ. Marburg--2008. / In SpringerLink. Titre de l'écran-titre (visionné le 11 novembre 2009). Bibliogr. Publié aussi en version papier.

Thèse de doctorat : SCIENCES APPLIQUEES : Metz : 1999. / 1999METZ003S. 109 REF.

Many electrophysiological experiments require the recording, stimulating, or both in the peripheral nervous system. There are many electrodes currently on the market, but they are either not designed for implantation or are not robust enough to be used multiple times in situ. The cost of buying these electrodes from a manufacturer can be prohibitive and many labs prefer to make their own. This introduces variability between studies, as different techniques and configurations in the design and fabrication of electrodes can create variance in electrical impedance, spatial arrangement, or other factors. This paper presents a detailed methodology for the construction of electrodes that are robust, have uniform impedance values of Z = 2.38 ± 0.906 kΩ. at 1 kHz alternating current (AC), and can be used in multiple in vitro or in situ experiments, or for chronic implantation in vivo. This method will reduce the amount of time and material needed to construct electrodes for experimental studies in animals.

In recent years rapid prototyping technology has been implemented in many spheres of industry, particularly the field of product development. Existing process provide the capability to rapidly produce a tangible solid part, directly from three dimensional CAD data, from a range of nonmetallic materials. In many situations the desired end product of a development cycle is a metallic object, whether a component or a tool. The development of a system capable of the direct manufacture of fully dense, metal parts is therefore seen as an important landmark in the evolution of rapid prototyping technology. A unique experimental project has been carried out to investigate the potential of laser surface cladding by pneumatic powder delivery to form the basis for such a process. A layered manufacturing part building strategy is proposed, in which laser cladding is used to deposit the near net shape of each layer. Conventional machining techniques are then used to trim each layer to the exact dimensions specified by the CAD data. A multi-kilowatt carbon dioxide laser was integrated with a four axis machine tool to create an opto-mechanical workstation on which to perform the process. A detailed study of the effects of cladding process parameters on the geometry of the deposited metal was carried out and quantitative relationships derived. These relationships are used to select process parameters appropriate to the geometry of the deposition required. A numerical method to fully describe the deposited clad geometry was developed in order that efficient cutter paths could be generated for the back machining cycle. These relationships are also used to determine the minimum size of deposited bead from which the required layer section may be machined, in order to optimise process efficiency. The application of the technique to the generation of a variety of simple geometries was investigated and the potential problems identified. A preliminary investigation into the process accuracy is made, relating specifically to the predictability of the geometry of multiple layer depositions and the distortion of parts as subsequent layers are deposited. The limits of geometrical complexity possible with the current apparatus, and the unsatisfactory build times involved, suggest that the most attractive application of this technique is as part of a hybrid process, adding a novel additive dimension to existing automated fabrication techniques.

Brick. A simple object, but one that has been a base unit of architecture for over 6000 years. It carries connotations of labour, of energy, of the fundamental desire of humanity to give form to the substance of the Earth. However, current tendencies in manufacturing and construction are challenging the prevalence of the traditional brick-and-mortar system. Automated manufacturing, large-scale prefabrication, and digital simulation are becoming standard practices. This thesis posits that although brick must adapt to a changing architectural climate, contemporary construction should also learn from the versatility and poetics of this timeless material. Starting from clay, I make and inhabit a shelter of brick. My interaction with the material serves as grounding for a wider discussion of its role in architecture today.