The first topic of this thesis proposes a digital negative phase shifter circuit which generates a clock with adjustable negative delays (phase shift) in order to avoid multi-locking hazards. Arbitrary negative phase can be generated by using multiplexers and voltage variable delay cells to select the required phase shift. The proposed design is implemented by 0.35 um CMOS 1P4M technology. A single-shot locking method is adopted to reduce the locking time. Most important of all, the negative phase shifter is predictable and adjustable. The simulation results show that the accuracy of the proposed design is better than 6%. The second topic is to describe a 10-bit, 80 MS/s analog-to-digital converter (ADC) for digital video broadcasting over terrestrial (DVB-T) receivers. The ADC is based on a four-channel parallel pipeline architecture which employs dynamic comparators and switch-capacitance sample-and-hold circuit to achieve high speed operation and low power consumption. Simulation results using a TSMC 0.35um 2P4M process show that the proposed ADC achieves 56dB spurious-free dynamic range (SFDR) and 9.01-bit ENOB.

Thesis (Ph. D.)--Georgia State University, 2006. / Title from title screen. Julian Diaz III, committee chair; Alan J. Ziobrowski, Paul Gallimore, J. Andrew Hansz (University of Texas at Arlington), committee members. Electronic text (172 p. : ill.) : digital, PDF file. Description based on contents viewed July 23, 2007. Includes bibliographical references (p. 166-171).

The subject of this thesis is the design of construction the machine for putting waffles in cartons. This device is manually adjustable for 3 kind of waffles and cartons and isn’t part of any technological line. This thesis contains introductory study, concept of possible variations, control of important parts of machine and prices of these parts.

Subject of this diploma thesis is elaborate a constructional design of the Automatic production line for wooden plate. The thesis is including study of two various solutions, basic computation unit, construction analysis of the device line. In the end of the thesis is included an economic evaluation, model of the line and documentation drawings.

Pour répondre aux besoins des clients concepteurs de systèmes IRM (Imagerie par Résonnance Magnétique), EXXELIA TEMEX veut étendre sa gamme de composants non-magnétiques. Mon travail de thèse s'inscrit dans le cadre du développement d’une nouvelle gamme de condensateurs ajustables non-magnétiques (aussi appelés trimmers) capables de tenir des environnements extrêmes en tension pour des applications de l’IRM. Pour se faire, les composants passifs intégrés doivent respecter les conditions extrêmes de fonctionnement : un courant RF (Radiofréquence) de 30A à 128MHz et une tension efficace jusqu’à 5kV.Dans un premier temps, les propriétés électriques des trimmers existants ont été déterminées expérimentalement et par simulation afin de valider le modèle numérique proposé. Ensuite, les propriétés électriques des différents diélectriques constitutifs du condensateur sont déterminées expérimentalement. A partir de considérations théoriques, nous avons établi des expressions nécessaires aux calculs des capacités et des fréquences de résonance. Le trimmer est ensuite dimensionné par simulation numérique (méthode des éléments finis) puis fabriqué. Deux modèles de diélectriques sont étudiés. Le gap d’air présent entre les électrodes est évalué par simulation numérique avant validation expérimentale. L’influence de l’air sur les performances du prototype final est finalement abordée : la tension de claquage et de la variation de la fréquence de résonance et de la capacité sont successivement traités. / As a non-invasive imaging technology, MRI (magnetic resonance imaging) revolutionizes medical diagnosis and diseases detection. Without damaging radiation, MRI systems use radio frequency (RF) waves to produce three dimensional detailed anatomical images. To reach the operating frequency of the next generation of MRI, new electronic components, in particular trimmers (called also adjustable capacitors) are necessary to obtain high-quality images. However, trimmers are still developed empirically using expired specifications that no longer respond to MRI requirements.First of all, to provide a high level of image resolution and to reduce manufacturing time and cost, electrical modeling is an important step. Then, according to these numerical simulations, prototypes are designed and then manufactured.

This thesis seeks to explore the architectural transformation of residential space for changes and adjustments as we find our lifestyles altering. With the understanding that change is often unpredictable, we must be prepared for adaptations to new and revised living environments. Change appears in many ways: marriage or cohabitation, having children, empty nesting, aging, caring for elder family members, illness, and death. Too often we design our homes for the present, with little thought of future needs. Universal and adjustable design must become an everyday part of an architectʼs repertoire when embarking on new projects with their clients. Even architects, working on “cookie cutter” projects, must bring a more sustainable approach to their designs. Taking a closer look on said "cookie cutter” projects, adjustable design must start from a broader spectrum, beyond the site, focusing on the development as a whole and its connection with its infrastructure. Within a community, camaraderie and conversation are major factors in the success of a residential development. The central focus of this paper will be the architectural adjustability of the home.

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Semi-active dampers utilizing various working principles have been developed for a variety of vehicles. These semi-active dampers have been designed to resolve the ride and handling compromise associated with conventional passive dampers, and increase vehicle stability. This thesis briefly reviews existing semi-active damper designs, including but not limited to MR dampers, before presenting two new prototype semi-active hydraulic dampers. Both prototype dampers are designed to provide a large force range while maintaining easily controllable valve characteristics. The first of these dampers served primarily as a proof of concept and a means of understanding the dynamics of a disc valve housed inside the main piston. The valve design is presented, along with other information concerning the fabrication of the Initial Prototype damper. Test results are presented and analyzed, and a second iteration of the valve is designed. The Final Prototype damper is a scaled up version of the initial design, with refinements made in piston geometry, internal disc profile, and dynamic seals. This large force range damper is tested and results are compared with existing MR dampers. The Final Prototype damper provides a significantly larger force range when compared with typical MR dampers. Finally, to conclude this research, the vehicle dynamics implications of the Final Prototype damper are discussed and recommendations for further study are made. / Master of Science

An issue of great concern for amputees continues to be lack of proper fit and comfort in their sockets. This lack can often be attributed to changes in the shape of the residual limb that cannot be compensated for by existing prosthetic socket technology. In regions where cost is a prohibitive factor in the replacement of ill-fitting prosthetic sockets, the need for a volume adjustable, and potentially longer lasting, socket design is abundant. This research focuses on designing a volume adjustable lower limb prosthetic socket that accommodates the needs of amputees in underdeveloped countries using collaborative design techniques. Though advocated as a means of accurately identifying and satisfying their needs, including end-users in the design process often adds an additional layer of complexity because of differences in culture, language, or geography among the participants. This research therefore includes a study in which product design techniques were applied to the same volume adjustable socket design problem with a variety of users – typical users, lead users, and new Empathic Lead Users - from different countries, one developed and one developing. To overcome differences among participants, this research includes an alternative strategy to create Empathic Lead Users (ELU) from non-user product design engineers through the use of simulated lead user experiences. As a result of this study, customer needs analysis with ELU helps to identify 95% of traditional and lead user customer needs and 100% more latent needs, and possibly more avenues for product innovations, than interviewing lead or traditional users alone. The concepts generated by all users were also compared. Based on the resulting concepts’ novelty, variety, quality, and quantity, all users were able to satisfactorily complete the concept generation exercises and produced competitive design solutions. Using the concepts generated during this co-design study, a volume adjustable socket was developed. The final socket design, based on the analogous rotational movement of a camera aperture, is pursued through mechanical and subject testing. Early users of the socket liked the design and it has been demonstrated to provide the necessary volume adjustments, but future design iterations to improve its comfort are necessary. / text