Tesis sobre el tema "Design and constructiono"
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1
Dowling, Susan J. "Constructing Identity Identity Construction". Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/art_design_theses/88.
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In this art-based study I will examine the construction of identity creating three life size figures utilizing metaphor and symbolism. I recorded and analyzed the process through reflections. The artist/teacher/researcher will provide conclusions based on art production and self-reflection.
2
Palaoro, Stefania. "Arch bridges: Design - Construction - Perception". Doctoral thesis, University of Trento, 2011. http://eprints-phd.biblio.unitn.it/504/1/Stefania_Palaoro_Arch_bridges%2Cdesign-construction-perception.pdf.
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The arch bridges have an historical development, that is rooted in their ancient tradition, yet are also very successful to this day, a rediscovery of the earliest arched forms can be seen in the most recent innovations. After millennia of masonry arch bridges and almost two centuries of relentless development of iron, steel and concrete arch bridges, with different structural schemes and constructive shapes, there was a moment that this type of structure was bound to disappear.
The scope of traditional arch bridges, which refers mainly to the ones of small and medium span, was to become the uncontested role of the girder bridges. The reuse and the assertion of the arch bridge has been accompanied by a strong architectural emphasis on their structural design and constructive details. This relation, increasingly important during the design phase between the concept of FORM and of STRUCTURE, has ensured that many new projects link the strong relationship between TRADITION and technological and constructive INNOVATION.
I ponti ad arco sono quelli che presentano un’evoluzione storica che fonda le sue radici nella tradizione più antica, ma anche quelli che ricevono all’oggi il maggior successo, una riscoperta delle prime forme arcuate che ritornano quasi come una moda ma con l’impiego delle recenti innovazioni: dopo millenni di ponti ad arco in muratura e quasi due secoli di inarrestabile sviluppo di ponti ad arco in ghisa, di ferro, acciaio e di cemento armato, accompagnato da diversi schemi strutturali e di forme costruttive, sembrava che questa tipologia fosse destinata a scomparire. Infatti il campo tradizionale dei ponti ad arco che si riferiva soprattutto ai ponti di media luce era divenuto oramai dominio incontrastato dei soli ponti a travata. Il riuso e il riaffermarsi del ponte ad arco è stato accompagnato da una forte accentuazione architettonica della loro concezione strutturale e dei loro dettagli costruttivi. Il rapporto sempre più importante in fase progettuale di correlare il concetto di FORMA con quello di STRUTTURA ha fatto in modo che molte nuove opere d’arte di nuova realizzazione unissero in sé il forte rapporto tra TRADIZIONE e INNOVAZIONE tecnologica e costruttiva.
3
Westerhoff, Kevin M. (Kevin Matthew) 1978. "Construction based design". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/84827.
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Au, Siu-man Michael y 區兆文. "Construction IT Centre". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31984988.
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Merczel, Daniel Balazs. "Weak storey behaviour of concentrically braced steel frames subjected to seismic actions". Thesis, Rennes, INSA, 2015. http://www.theses.fr/2015ISAR0006/document.
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Les contreventements en acier sont des moyens couramment utilisés pour assurer une rigidité latérale et une résistance aux bâtiments en acier, mais aussi aux bâtiments mixtes acierbéton et aux bâtiments en béton armé. La performance sismique des ossatures contreventées a été étudiée par de nombreux auteurs, la plupart concluent que la réponse réelle de ces ossatures peut différer beaucoup de celle des modèles simplifiés préconisés dans les codes dont l’Eurocode 8. En conséquence, pour obtenir un comportement sismique satisfaisant, ces codes peuvent d’être amendés ou même fondamentalement modifiés. Notre travail de thèse se concentre sur l’éventualité d’un comportement dissipatif localisé sur un étage de l’ossature. Les objectifs de la recherche sont les suivants: - Donner une description plus réaliste de la réponse sismique des ossatures contreventées; - Identifier les facteurs contribuant au développement d’un comportement dissipatif localisé sur un étage; - Examiner la performance des ossatures contreventées dimensionnées conformément à l’Eurocode 8; - Identifier les points faibles des règles de l’Eurocode 8 à l’origine de ce comportement insuffisant; - Proposer une méthode de redimensionnement complémentaire à la procédure actuelle de l’Eurocode 8 faisant appel à d’autres critères et vérifier la validité de cette méthode de redimensionnement sur plusieurs exemples d’ossatures démontrant la disparition complète de mécanismes dissipatifs localisés à un ou quelques étages; Afin de pouvoir apprécier l’insuffisance de l’Eurocode 8 à ce sujet, plusieurs bâtiments ont été dimensionnés selon cet Eurocode et ont été testés par des simulations numériques de type analyse dynamique incrémentale. L’évolution du déplacement relatif maximal entre étages (IDR) en fonction de l’augmentation du facteur d’échelle de l’accélération maximale du sol a été calculée à partir des résultats du calcul numérique. Il est constaté que l’apparition d’étages faibles dans les ossatures contreventées a une nature, progressive et autoamplifiante. La description précise du comportement fournit la possibilité d’une analyse critique des parties correspondantes de l’Eurocode 8 et de proposer une méthode de redimensionnement que nous avons appelé Robust Seismic Brace Design (RSBD). L’idée centrale de la méthode repose sur la nécessité d’utiliser un modèle inélastique d’analyse de la structure à la place du modèle élastique initial. Deux critères essentiels sont introduits dont l’objectif premier est de mieux répartir la dissipation en empêchant la réalisation d’un mécanisme local. Les performances des bâtiments renforcés sont sans exception meilleures que celles des bâtiments originaux; donc la méthode Robust Seismic Brace Design est une bon complément à la procédure de l’Eurocode 8 pour la conception parasismique des ossatures contreventéesThe concentric steel bracing is a commonly used way of providing lateral stiffness and resistance in both steel, composite and even concrete multi-storey framed buildings. Also it is an alternative for seismic retrofitting. The seismic performance of concentrically braced frames has been investigated by numerous authors during the past decades as several issues have been identified either related to the actual response, or the seismic design procedure implemented by standards such as the Eurocode 8. The topics are various, e.g. the cyclic dissipative behaviour of axially loaded braces, innovative bracing arrangements and members, controversial requirements imposed on the same members, localization of inelastic deformations related to the so called weak storey behaviour. The conclusion of most of the prior research conducted on the seismic performance of braced steel frames is that the actual response of a braced building differs from that of a simplified model applied by corresponding codes. Consequently, to safeguard satisfactory seismic behaviour, the Eurocode 8 standard in particular needs to be modified or amended. In order to confine the addressed topic to a size that may be discussed sufficiently in the frame of a PhD research, in the present thesis primarily the weak storey behaviour is looked into. The objectives of the research are: - Provide a better description of the seismic response of concentrically braced frames; - Identify the factors contributing to the development of weak storeys; - Investigate the performance of braced buildings designed according to Eurocode 8; - Identify the reasons why the Eurocode 8 designs are found usually inadequate; - Propose a new design method or additional criteria to the existing Eurocode 8 procedure and verify their viability by providing designs that successfully counteract seismic actions without the development of weak storeys; In the dissertation it is demonstrated by the incremental dynamic analysis of several braced frames that the Eurocode 8 provisions do not provide satisfactory designs. The examination of the responses of the designs is used to characterize the behaviour. It is found that the occurrence of weak storeys in braced frames has a specific, gradual, self-amplifying nature. By further analysis of the seismic responses, proof is given to the existence of this specific behaviour. The better description of the behaviour provides the possibility of a critical analysis of the corresponding parts of Eurocode 8 and the basis of the Robust Seismic Brace Design method criteria. These criteria are related to the anticipated inelastic seismic response of braced frames, and with their application in design weak storeys can be easily recognized and reinforced. The performances of the reinforced buildings are without exception better than that of the original Eurocode 8 designs; therefore the Robust Seismic Brace Design method is found to be a good alternative of the Eurocode 8 procedure for the seismic design of concentrically braced frames
6
Leung, Chi-ming. "Design consultancy vs design and build consultancy : present trends in the construction industry /". Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14038869.
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Phillips, Martin. "I'm your common space, create me! : From the desire to participate to the construction of the city". Thesis, KTH, Stadsbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146863.
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Participatory planning and design is a subject that has been around for quite some time. It has been theorized by several authors and put in practice by many practitioners. After going through some of the literature and studying in detail some real-life participatory experiences, it’s still hard to tackle the subject because of its complexity. I could have tried to simplify it and look into one type of participation, but instead I tried to understand it in all its complexity and diversity, maybe leaving some unsolved questions. Throughout this semester I studied four different cases of participatory planning/design and I analyzed and compared them. These are located in Paris (France), Medellín (Colombia), Banjarmasin (Indonesia) and Gothenburg (Sweden). I looked at them through some of the concepts I found in the literature, like for example the idea of desire treated by Doina Petrescu in some of her texts. After extracting some conclusions from the case studies I got involved in a real-life participatory process carried out in the School of Architecture at KTH to include students, teachers and others in the design of a new location for the school. I took part in one of their meetings and I had three parallel workshops in English with the participation of some students. This helped me experience and understand better what participation really means and implies. I put myself in the role of a facilitator who initiates a process, and therefore carries it out. I learned about the importance of the invitation to participate and how important it is to be clear on the activities and questions posed to the participants.
8
Qin, Hong. "Construction of uniform designs and usefulness of uniformity in fractional factorial designs". HKBU Institutional Repository, 2002. http://repository.hkbu.edu.hk/etd_ra/456.
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Xie, Xiaoling. "Communications in construction design". Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/7571.
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Construction design has become an increasingly complex synthesis activity for which effective solutions depend upon co-operative participation by a number of people. Thus communication, including the integration of specialised knowledge and negotiation of differences between team members, is a vital process for collaborative design. A questionnaire survey was initially conducted to investigate communication issues and problems, which had been highlighted from a review of the literature, in current construction design. The results confirmed that communication among the different construction team members is often difficult although of paramount important to design outcomes. Based on these results, case studies have been carried out to gain further insights into communication issues and problems, and explore why and how they are caused. Through the application of multiple approaches, a model has been developed, which suggests strategies that may help participants communicate more effectively and ultimately improve the quality of construction design outcomes.
10
Soto, Leticia S. M. Massachusetts Institute of Technology. "Construction design as a process for flow : applying lean principles to construction design". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42995.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2007.Includes bibliographical references (p. 108-111).
Delays and cost overruns are the rule rather than the exception in the construction industry. Design changes due to lack of constructability late in the construction phase generating costly ripple effect which create delay and disruption throughout the entire organization, are the largest contributors to the stated rule. In the building construction industry, of increased competitiveness, demand from many companies continued effort to develop new methods and tools, in which the design for quality, cost, construability and reliability play an important role. The planning and management of building design has historically focused upon traditional methods of planning such as Critical Path Method (CPM). Little effort is made to understand the complexities of the design process; instead design managers focus on allocating work packages where the planned output is a set of deliverables. This current design method forces design teams to manage their work on a discipline basis, each working on achieving their deliverable as dictated by the design program with little regard of the relationship with other disciplines and organizations. In addition, because Architect and Engineering firms view design and construction as two separate independent phases of work in project it makes it difficult to verify constructability in a design and create flow in the overall process. The goal of this study is to look at how aligning interests, objectives and practices based on lean fundamentals, during the earliest stages of a project, as a method of improving construction performance.
by Leticia Soto.
S.M.
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Ke, Xiao. "On lower bounds of mixture L₂-discrepancy, construction of uniform design and gamma representative points with applications in estimation and simulation". HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/152.
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Two topics related to the experimental design are considered in this thesis. On the one hand, the uniform experimental design (UD), a major kind of space-filling design, is widely used in applications. The majority of UD tables (UDs) with good uniformity are generated under the centralized {dollar}L_2{dollar}-discrepancy (CD) and the wrap-around {dollar}L_2{dollar}-discrepancy (WD). Recently, the mixture {dollar}L_2{dollar}-discrepancy (MD) is proposed and shown to be more reasonable than CD and WD in terms of uniformity. In first part of the thesis we review lower bounds for MD of two-level designs from a different point of view and provide a new lower bound. Following the same idea we obtain a lower bound for MD of three-level designs. Moreover, we construct UDs under the measurement of MD by the threshold accepting (TA) algorithm, and finally we attach two new UD tables with good properties derived from TA under the measurement of MD. On the other hand, the problem of selecting a specific number of representative points (RPs) to maintain as much information as a given distribution has raised attention. Previously, a method has been given to select type-II representative points (RP-II) from normal distribution. These point sets have good properties and minimize the information loss. Whereafter, following similar idea, Fu, 1985 have discussed RP-II for gamma distribution. In second part of the thesis, we improve the discussion of selecting Gamma RP-II and provide more RP-II tables with a number of parameters. Further in statistical simulation, we also evaluate the estimation performance of point sets resampled from Gamma RP-II by making comparison in different situations.
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Sebille, Michel. "Design :construction, automorphisms and colourings". Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211428.
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Chew, En Phin. "Superconducting Transformer Design and Construction". Thesis, University of Canterbury. Electrical and Computer Engineering, 2010. http://hdl.handle.net/10092/4977.
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This thesis first outlines the testing undertaken on a partial core superconducting
transformer under open circuit, short circuit, full load and endurance test conditions.
During the endurance test, a failure occurred after 1 minute and 35 seconds. During the
failure, voltage dipping and rapid liquid nitrogen boil off was observed. This prompted
a failure investigation which concluded that the lack of cooling in the windings was the
most probable cause to the failure.
Full core transformer and superconductor theories are then introduced. A copper
winding transformer model, based on a Steinmetz equivalent circuit and a reverse
design method, is described. A superconductor loss model which outlines the different
types of losses experienced under AC conditions is used to determine the resistance
of the windings in the Steinmetz equivalent circuit. This resistance changes with the
magnitude of current and the strength of the magnetic field that is present in the gaps
between each layer of the windings. An alternative leakage flux model is then presented,
where the flux is modelled based on the combination of the reluctance of the core and
the air surrounding the windings. Based on these theories, an iterative algorithm to
calculate the resistance of the superconductor is developed.
A new design of a 15kVA single phase full core superconducting transformer, operating
in liquid nitrogen, is presented. The issues with building the superconducting
transformer are outlined. First, a copper mockup of the superconducting transformer
was designed where the mockup would have the same tape and winding dimensions
as the superconducting transformer, which means the same core can be used for two
different sets of windings. This led to designing a core that could be easily taken apart
as well as reassembled. Construction of the core, the copper windings and the superconductor
windings ensued. The process of cutting the core laminations, insulating the
copper and superconductor tapes, and making the steel fasteners and terminations are
described.
The copper mockup and superconducting transformers was then tested under open
circuit, short circuit, different load and endurance conditions at both liquid nitrogen
and room temperatures. These test results were then compared with the those from
two models. The comparison showed a significant inaccuracy in the reactances in
the models. This introduced a correction factor into the superconductor model which
ii
made it more accurate. However, further work is required to explain and quantify the
correction factors for the copper transformer model under different load conditions.
14
Palaoro, Stefania. "Arch bridges: Design - Construction - Perception". Doctoral thesis, Università degli studi di Trento, 2011. https://hdl.handle.net/11572/367845.
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The arch bridges have an historical development, that is rooted in their ancient tradition, yet are also very successful to this day, a rediscovery of the earliest arched forms can be seen in the most recent innovations. After millennia of masonry arch bridges and almost two centuries of relentless development of iron, steel and concrete arch bridges, with different structural schemes and constructive shapes, there was a moment that this type of structure was bound to disappear.
The scope of traditional arch bridges, which refers mainly to the ones of small and medium span, was to become the uncontested role of the girder bridges. The reuse and the assertion of the arch bridge has been accompanied by a strong architectural emphasis on their structural design and constructive details. This relation, increasingly important during the design phase between the concept of FORM and of STRUCTURE, has ensured that many new projects link the strong relationship between TRADITION and technological and constructive INNOVATION.
I ponti ad arco sono quelli che presentano un’evoluzione storica che fonda le sue radici nella tradizione più antica, ma anche quelli che ricevono all’oggi il maggior successo, una riscoperta delle prime forme arcuate che ritornano quasi come una moda ma con l’impiego delle recenti innovazioni: dopo millenni di ponti ad arco in muratura e quasi due secoli di inarrestabile sviluppo di ponti ad arco in ghisa, di ferro, acciaio e di cemento armato, accompagnato da diversi schemi strutturali e di forme costruttive, sembrava che questa tipologia fosse destinata a scomparire. Infatti il campo tradizionale dei ponti ad arco che si riferiva soprattutto ai ponti di media luce era divenuto oramai dominio incontrastato dei soli ponti a travata. Il riuso e il riaffermarsi del ponte ad arco è stato accompagnato da una forte accentuazione architettonica della loro concezione strutturale e dei loro dettagli costruttivi. Il rapporto sempre più importante in fase progettuale di correlare il concetto di FORMA con quello di STRUTTURA ha fatto in modo che molte nuove opere d’arte di nuova realizzazione unissero in sé il forte rapporto tra TRADIZIONE e INNOVAZIONE tecnologica e costruttiva.
15
Creyts, Don Stafford IV. "Design and fabrication of a MEMS magnetic bistable valve". Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17950.
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Wei, Yu Zhang. "Design and development of new micro-force sensors". Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691170.
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Pollard, Lloyd Wayne 1936. "Design of a flexure mount for optics in dynamic and cryogenic environments". Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276741.
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The design of the flexure mount recently submitted to NASA Ames for the structural support of the primary mirror of the Space Infrared Telescope Facility (SIRTF) is presented. The flexure system must passively accommodate the differential thermal contraction between the glass mirror and the aluminum structure of the telescope during cryogenic cooldown. Further, it must support the one meter diameter, 116 kilogram (258 pound) primary mirror during a severe launch to orbit. Procedures used to establish the required radial compliance using computer programs NASTRAN and FRINGE are discussed. The parametric design program developed to study early concepts is presented. Methods of combining modal responses resulting from a displacement response spectrum analysis are discussed, and a combination scheme called MRSS, Modified Root of Sum of Squares, is presented. Modal combination schemes using MRSS, SRSS, and ABS are compared to the results of a Modal Frequency Response analysis.
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Carlsson, Linnea. "Visual Planning in construction : a study of its use in construction projects". Thesis, KTH, Fastigheter och byggande, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96390.
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Abstract The purpose of this master thesis is to investigate of what use the method Visual Planning can be in the construction industry in general and in the design phase of construction projects in particular. The investigation and empirical part of the thesis has been based on semi-structured interviews with process developers, design managers and designers from Swedish companies where Visual Planning is used. The interviews have been the base for a comparative case study with the aim of providing an overview of how the method is currently used, interpreted, experienced and perceived in the Swedish construction industry and by its professionals. The master thesis has been made in collaboration with the Swedish consultancy firm Tyréns AB in Stockholm. The results of the interviews differ on an individual level. The majority of the respondents are however positive and believe in the future of the methods. All respondents stress the lacking documentation, however, as the major difficulty. Several respondents have stressed the difficulties of working in a scattered team due to the analogue format as a shortcoming of the method as well. The biggest benefits stated are the easy accessible overview provided and the clarification of commitments, due to the active participation of the design participants, the analogue format, and the way of mapping of the information process. It has been found that Visual Planning can be of use as a support in the process of construction project management, since it may facilitate the understanding of how to reach objectives and provide an easy accessible overview of the progress and status of a project. It should however be viewed as a complement to the process of construction project management, and not as a replacement. In conclusion it may facilitate earlier problem solving, since commitment is raised, which in the end facilitates the project to stay within budget as well as to meet the deadline.Sammanfattning Syftet med detta examensarbete är att utreda vilken nytta metoden Visuell Planering kan vara av i byggbranschen i allmänhet och projekteringsfasen av byggprojekt i synnerhet. Undersökningen har baserats på semi-strukturerade intervjuer med processutvecklare, projekteringsledare och projektörer från företag inom den svenska byggsektorn där Visuell Planering används. Intervjuerna har utgjort grunden för en jämförande fallstudie med avseendet att skapa en överblick och insyn i hur metoden i dagsläget används, tolkas och upplevs i den svenska byggbranschen och av yrkesverksamma i branschen. Examensarbetet har genomförts i samarbete med konsultföretaget Tyréns AB i Stockholm. Intervjuresultaten varierar på individnivå. Majoriteten av intervjupersonerna är dock positiva och tror på metodens framtid. Alla tillfrågade beskriver den låga mängden dokumentation som det största problemet hos metoden. Flera yrkesverksamma beskriver även metodens tillkortakommanden då arbete bedrivs i spridda team. En följd av metodens analoga format. Den genererade lättöverskådliga helhetsbilden och förtydliganden av åtagande och engagemang, som följd av projektmedlemmarnas aktiva deltagande, det analoga formatet och sättet som informationsprocessen kartläggs beskrivs som det största vinsterna. Det har framkommit att Visuell Planering kan vara av användning och fungera som ett stöd i byggprojektledning, då metoden underlättar förståelse för hur mål ska uppnås och skapar en lättuppfattad bild av ett projekts status och framåtskridande. Metoden bör dock ses som ett komplement i processen av byggprojektledning och projekteringsledning, snarare än en ersättning. Visuell Planering kan slutligen främja problemlösningen i tidigare skeden, då känslan av förpliktelse, åtagande och engagemang höjs, vilket i sin tur skapar bättre möjligheter för projektet att hålla sig inom budget så väl som att möta deadline.
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Stevens, John Wesley. "A design of a low-cost propulsion system for an electric scooter". Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17885.
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Bencich, John Andrew. "A proposition for an (express)way architecture". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/24099.
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Wan, Weijie 1982. "Simulation and optimization of MEMS actuators and tunable capacitors". Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99798.
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Micro-Electro-Mechanical Systems (MEMS) have played an important role in modern microelectronics, thermal, mechanical and hybrid systems. MEMS technology is a very promising means that might have a great impact on almost every corner of the society. Although many design methodology of MEMS already exists, not as much attention was given to the synthesis and optimization of MEMS devices. This thesis focuses on the optimization of MEMS actuators and MEMS tunable comb drive capacitors. The optimization is based on changing device geometry to achieve desired output parameter profile. For example in the design of MEMS tunable comb drive capacitors, the output parameter is the capacitance tuning range. Numerical experiments were performed to show the successful implementation of the optimization method.
22
Zhang, Rui. "Mechanics of micromachined bridge-type accelerometer". Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/1285.
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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2005Having simple structure and high sensitivity, micro accelerometer is a type of popular transducer used to measure the acceleration in a great variety of conditions. The bridge-type micro accelerometer is a typical micro accelerometer and has many types. As one of research project of Kentron in South Africa, the thesis presented here analyzes the bridge-type capacitive nticro accelerometer (BTCMA) and the bridge-type micro accelerometer with two piezoelectric thin films read-out (BTPMA). In this thesis, the similar structures are used on BTCMA and BTPMA For proving the fundamental mode of the structure can measure acceleration and utilizing the structural and electric characteristic to avoid the effect of higher modes, the program CoventorWare for nticro-electric-mechanical system (MEMS) design and analysis is used here to analyze the modes of these two structures, The two group piezoelectric thin films of BTPMA can be connected in serial or parallel configurations. Integrating piezoelectric effect method, strength method and energy method, the analytical analysis of these two configurations has been done with particular emphasis on the elastic characteristics of the thin films. The analytical formulas of transducer, sensitivity, resonance frequency, noise, quality factor, ntinimum detectable signal and maximum detectable range are obtained. According to the comparison results between these two configurations, the charge output in parallel configuration is a little more than that in serial configuration and the sensitivity in serial configuration is much higher than that in parallel configuration. Finally, a calculation of certain practical nticro accelerometer size is used to prove the above conclusions. On the base of capacitance theory, strength method and energy method, the analytical analysis of the BTCMA has been done in this thesis.
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Wang, Lin. "Mechanics of micro capacitive accelerometer with u-shape cantilever beam". Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/2616.
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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2005.Due to an increasing in industrial micromation need in recent years, the use of micro accelerometers has been highly increased. Consecutively, this has promoted research activities in this field; capacitive accelerometers also have got high concern at large. As a research project of the Kentron in South Africa, this thesis deals with a theoretical model for a one-dimensional micro capacitive accelerometer with U-shape cantilever beam. The properties of the small angle tilted-plate capacitor have been analyzed; the capacitance equation and electrostatic force equation of this kind capacitor have been derived. The sensing element of this accelerometer consists of an inertial mass connected with two cantilever beams. The vibration modes analysis to the sensing element was accomplished by using CoventorWare2004's MemMech module, the result indicates that the main vibration mode can cause the capacitance change observably and the effect of the other modes to the capacitance can be ignored, which satisfied the purpose of the design. In the process of deriving the linearizing acceleration equation, the angle of the inertial mass caused by the deformation of the U-shape cantilever beam was taken into account as well as the electrostatic force between the two electrodes, thus the more precise acceleration linear equation was obtained. The sensitivity equation was derived through the acceleration linear equation, the relationship between the main parameters of the system and the sensitivity has been analyzed. The differential structure of this micro capacitive accelerometer was also analyzed; the linearizing acceleration equation and sensitivity equation of this kind structure were derived, it has been proven that the sensitivity of this structure is twice than the normal structure approximately. The maximum detectable signal was obtained in terms of the fracture strength of the cantilever beam and the maximum displacement of the inertial mass. The minimum detectable signal was obtained in terms of the thermal noise analysis. In the process of the dynamic analysis, the forced vibration produced by the sinusoidal periodic force and sinusoidal periodic moment was analyzed and the transient capacitance equation was derived, this proved the system has good dynamic character in theory. The system was simulated and analyzed by using CoventorWare2004's Saber module. The initial capacitance analysis indicates the relationship between the voltage and the initial capacitance, the result is close to the analytic model. The resonance frequencies analysis indicates that the main dimensions of the sensing element can determine the resonance frequencies and each vibration mode's sequence, the initial dimensions of the sensing element was proved reasonable by analyzing. Sensitivity analysis and Monte Carlo analysis indicate the effect of the sensing element's normal manufacturing tolerance to the system's frequency is small. Impact of plate curvature analysis indicates the effect of the inertial mass's deformation caused by the surface stress to the capacitance is small. Transient analysis obtained the system's transient displacement curve of six directions and transient capacitance curve in normal terms; this proved the system has good dynamic character in the simulating environment.
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Geng, Yue. "Time-dependent behaviour of concrete-filled steel tubular arch bridges". Phd thesis, Faculty of Engineering and Information Technologies, 2011. http://hdl.handle.net/2123/8668.
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Cho, Myung Kyu. "Structural deflections and optical performances of lightweight mirrors". Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184875.
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A parametric design study of light weight mirror shapes with various support conditions was performed utilizing the finite element program NASTRAN. Improvements in the mirror performance were made based on the following design criteria: (1) minimization of the optical surface wavefront variations, (2) minimization of the self-weight directly related to cost of manufacturing, and (3) optimal location of support points. A pre-processor to automatically generate a finite element model for each mirror geometry was developed in order to obtain the structural deformations systematically. Additionally, a post-processor, which prepares an input data file for FRINGE (an optical computer code) was developed for generating the optical deflections that lead to the surface wavefront variations. Procedures and modeling techniques to achieve the optimum (the lightest and stiffest mirror shape due to self-weight) were addressed. Fundamental natural frequency analyses, for contoured back mirror shapes for a variety of support conditions, were performed and followed by comparisons of the results which were obtained from NASTRAN and a closed-form approximate solution. In addition, element validity and sensitivity studies were conducted to demonstrate the behavior of the element types provided in the NASTRAN program when used for optical applications. Scaling Laws for the evaluations of the optical performances and the fundamental frequencies were established.
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Whitaker, David S. "The Use of Evidence-Based Design in Hospital Renovation Projects". BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6692.
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Since the 1960s, researchers have been exploring how the design of the built environment impacts the health and well-being of occupants and users. By the 1980s, further research began to focus on healthcare facilities in particular and how design could influence patient healing and medical staff performance (Alfonsi, 2014). Evidence-Based Design (EBD) is "the process of basing decisions about the built environment on credible research to achieve the best possible outcomes" (CHD, 2016). The desired outcomes of Evidence-Based Design recommendations include improvements in the following: patient healing, patient experience and comfort, medical staff performance, and medical staff job satisfaction (CHD, 2017). Extensive research has been done on the subject of EBD; however, the question remains whether or not the latest research findings are being utilized by the design and construction industries in practice. The purpose of this research is to determine whether or not the latest scientific knowledge and research findings are being implemented into hospital renovation projects by the healthcare design and construction industries. A list of recommendations from existing EBD literature was compiled. Construction documents from 30 recent healthcare facility renovation projects across the United States were then obtained and analyzed. The findings indicate that EBD recommendations are being adopted in practice at consistently high levels. These findings also reveal that there are still areas of potential improvement which could inform those who influence or determine building and design codes, standards, and guidelines. The results are instructive to owners, designers, and contractors by providing a glimpse into how well the industry is recognizing and implementing known best practices. The findings likewise open up new opportunities for further research which could lead to additional improvement in the healthcare facilities of the future.
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Au, Siu-man Michael. "Construction IT Centre". Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25945932.
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Sutanto, Bintoro Jemmy. "An Electromagnetic Actuated Microvalve Fabricated on a Single Wafer". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4891.
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Microvalves are essential components of the miniaturization of the fluidic systems to control of fluid flow in a variety of applications as diverse as chemical analysis systems, micro-fuel cells, and integrated fluidic channel arrangements for electronic cooling. Using microvalves, these systems offer important advantages: they can operate using small sample volumes and provide rapid response time.
This PhD dissertation presents the world first electromagnetically actuated microvalve fabricated on a single wafer with CMOS compatibility. In this dissertation, the design, fabrication, and testing results of two different types of electromagnetic microvalves are presented: the on/off microvalve and the bistable microvalve with latching mechanism. The microvalves operate with power consumption of less than 1.5 W and can control the volume flow rate of DI water, or a 50% diluted methanol solution in the range 1 - 50 µL in. The leaking rate of the on/off microvalve is the order of 30 nL/min. The microvalve demonstrated a response time for latching of 10 ms in water and 0.2 ms in air. This work has resulted in a US patent, application no. 10/699,210.Other inventions that have been developed as a result of this research are bidirectional, and bistable-bidirectional microactuators with latching mechanism, that can be utilized for optical switch, RF relay, micro mirror, nano indenter, or nano printings.
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Law, Gordon Ki-Wai. "Decision support system for construction cycle design". Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26715.
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The objective of this thesis is to develop a conceptual design of a computerized environment for detailed design of construction activities associated with projects characterized by significant repetition.
High-rise building construction is used as the example of repetitive construction projects. The construction cycle design of a typical floor structure is studied to gain an understanding of the difficulty and complexity involved in the activity design process. Modeling techniques currently used in construction planning, modeling techniques developed in the field of operations research, and assembly line balancing techniques used in industrial engineering are reviewed to determine their applicability for detailed construction cycle design.
Using the concept of decision support systems developed in the fields of management science and knowledge engineering for solving ill-structured and ill-defined problems, a conceptual design of a decision support system for construction cycle design is developed.Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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Mahdavi, Sareh. "RF power amplifiers and MEMS varactors". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112576.
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This thesis is concerned with the design and implementation of radio frequency (RF) power amplifiers and micro-electromechanical systems---namely MEMS varactors. This is driven by the many wireless communication systems which are constantly moving towards increased integration, better signal quality, and longer battery life.The power amplifier consumes most of the power in a receiver/transmitter system (transceiver), and its output signal is directly transmitted by the antenna without further modification. Thus, optimizing the PA for low power consumption, increased linearity, and compact integration is highly desirable.
Micro-electromechanical systems enable new levels of performance in radio-frequency integrated circuits, which are not readily available via conventional IC technologies. They are good candidates to replace lossy, low Q-factor off-chip components, which have traditionally been used to implement matching networks or output resonator tanks in class AB, class F, or class E power amplifiers. The MEMS technologies also make possible the use of new architectures, with the possibility of flexible re-configurability and tunability for multi-band and/or multi-standard applications.
The major effort of this thesis is focused on the design and fabrication of an RF frequency class AB power amplifier in the SiGe BiCMOS 5HP technology, with the capability of being tuned with external MEMS varactors. The latter necessitated the exploration of wide-tuning range MEMS variable capacitors, with prototypes designed and fabricated in the Metal-MUMPS process.
An attempt is made to integrate the power amplifier chip and the MEMS die in the same package to provide active tuning of the power amplifier matching network, in order to keep the efficiency of the PA constant for different input power levels and load conditions.
Detailed simulation and measurement results for all circuits and MEMS devices are reported and discussed.
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Ferguson, A. J. L. "Dilution refrigerator : Design, construction and performance". Thesis, University of Ulster, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378638.
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Batzer, Rachel E. (Rachel Elizabeth). "Design and construction of a dynamometer". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68827.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011."June 2011." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 20).
Access to a dynamometer is a useful tool for any electrical system where the motors must be selected from various suppliers and fully characterized. Motor suppliers usually provide a torque, speed, efficiency curve, but it frequently lacks complete motor characterization and includes motor controller losses in the total system loss. The dynamometer presented in this thesis is primarily designed for testing of high efficiency motors and motor controllers in the power and speed range requires for competition in the World Solar Challenge, a transcontinental race for solar electric vehicles. The testing specifications of a solar electric vehicles are uncommon among motor testing needs because it requires high torque, low power, high efficiency, and the only a small operating range. This thesis covers the design and construction of the dynamometer.
by Rachel E. Batzer.
S.B.
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Bibby, Lee. "Improving design management techniques in construction". Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/793.
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Recent years has seen a significant drive away from traditional procurement routes with contractors finding themselves with an increasing responsibility for control of design - a process they have had little experience in managing. They now have to adapt accordingly. The learning curve is steep, not least because many projects must now be delivered fast track while co-ordinating increasingly complex fabric and content of buildings without a platform of accepted good practice to manage the design process. This is a major factor preventing the UK construction industry from delivering projects on time, to budget and to the specified quality. There is a need to educate an increasing number of people in design management techniques to equip them to manage today's fast moving and demanding projects. However, many current design management tools are insufficiently developed for industry application. Therefore, to improve design management in the industry, current techniques must be modified to align them with the needs of the modern design manager. This research has developed and tested a training initiative aimed at improving design management practice within a major UK Design and Construct Contractor. It comprises a Design Management Handbook, Design Management Training, Team Support and Project Monitoring. The Design Management Handbook is the core of the training initiative. It addresses critical aspects of design management practice and provides design management tools. Training provides guidance to project teams on the tools and practices. In Team Support project teams are supported in the implementation of the new practices and tools to help embed new ways of working in company practice. Project Monitoring establishes the impact of the new practices on project performance to demonstrate that they are working and thus reinforce change. To establish the training initiative's effectiveness and key findings, the impact of the initiative on design management performance has been explored. The research has established which practices and tools were used, which were not, as well as an understanding the applicability and performance of each Handbook practice and tool. From this, barriers to implementing new design management tools in industry were identified and strategies developed in order to overcome such barriers.
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Jeffries, James R. "Construction implications of photolithography equipment design /". May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
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Gonzalez, Alvaro Eduardo. "Organisational Design & Mirroring in Construction". Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15086.
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The mirroring hypothesis posits that an intrinsic connection exists between the architecture of a product and that of the organisation which produces it, which can influence operational efficiency. The mirroring hypothesis is applicable to construction wherein organisational design is concerned with the establishment of governance frameworks for the procurement of projects and product design is that of buildings and engineering structures. This thesis investigates the hypothesis that design data architecture mirrors component architecture in a construction project. A general procedure has emerged to investigate the mirroring hypothesis, consisting of three steps: the capturing of product architecture, the capturing of organisational architecture, and comparison of the two. The subject project is a completed building. The capturing of architecture is achieved by modelling functional dependency between components in the form of a node-link network structure. It was found that the subject project did not exhibit a high degree of visible or otherwise mirroring, hence the hypothesis is concluded to be false in this case. An explanation is that two architectures within one have been identified in the model. This makes senses because design data is structured into packages associated with design disciplines which are associated with sub-systems, which in turn corresponds to design team structure. On the other hand, the components model was prepared principally on the basis of physical connectivity. The result implies for organisational design in construction that the design management role should either be carried out by the architect for mirroring alignment, or, to mitigate misalignment, by a third party with design background as opposed to a construction background.
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Tisaj, David. "Design and construction of a tachometer". Thesis, Tisaj, David (2014) Design and construction of a tachometer. Other thesis, Murdoch University, 2014. https://researchrepository.murdoch.edu.au/id/eprint/25564/.
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The purpose of this report is to provide a guided tour of how everything was achieved by choosing the right parts, implementation and building, testing, results and of course to inspire future projects and students into making student level tachometers because they all come in different shapes and sizes. A microcontroller programmed using the Arduino software on Microsoft Windows in a combination of C and C++ was used to control various circuitry and brought the device to life with the Arduino software and a few external libraries. Various alterations and upgrades could be made to this device as this thesis only explores a fraction of the endless possibility of technologies, methods, programs, and electrical components.
This thesis paper contains extensive research and will explore where tachometers came from and the current sensor technology used today such as the Hall Effect, generator, light reflected from a laser or an optical encoder that can determine position of a rotating device. The different technologies’ advantages and disadvantages will be looked into because in differing circumstances one might be better than the other. The specifications for this thesis are to measure and display the movement of a rotating machine in revolutions per minute or radians per second. The idea of the project was to make all the parts fit into a box and make it portable so getting the right battery was a cost versus function compromise.
Tachometers are essentially used for measuring speed and can be in turn, control manually or automatically some aspect of the measured machine. Tachometers can be used for scheduling maintenance after certain mileage and therefore reducing costs over a machine’s lifetime.
The basis for measurement is by using the Arduino’s interrupt function which will take quick and accurate time based measurements. The internal pull up resistor built into the Arduino’s board will ensure no false positives are recorded when a falling edge is present on the interrupt pin. Specifications from data sheets are examined in great detail to prevent damage to any of the components and part of the method is testing along the way and looking for problems and solutions.
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Kristjánsdóttir, Rut. "Design of Heavy DutyPavements". Thesis, KTH, Byggnadsmaterial, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218502.
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This research is focused on design of Heavy Duty Pavement which is when a pavement loading exceeds highway levels. The environment where these conditions occur are for example at ports, industrial areas and airport because of the use of heavy vehicles as handling of containers by Straddle Carriers, Front Lift Trucks or Reach Stackers, airplanes and more. The main emphasis here will be on heavy duty pavements for ports. Different design methods are discussed and compared for the pavement design of ports. In this research two different design methods are thoroughly analyzed, the British Ports Associations Heavy Duty Pavements Manual which is a chart based procedure and the HIPAVE program which is an Australian Heavy Duty Pavement Design Guide. Both those methods are widely used around the world. Furthermore, an analysis is performed to research the plastic properties of the pavement. In most design methods, the material properties of the granular materials are assumed as elastic when they are not, they are elasto-plastic. A Finite Element Analysis is performed to determine if this assumption has significant effect on the design of pavements by comparing models of a design pavement section with elastic granular materials and elasto-plastic granular materials. The main conclusions from the comparison study of different pavement design methods are when using the HIPAVE program the total thickness of the design pavement section is smaller than using the British Ports Manual. Smaller thickness result in less materials needed for and therefor lower cost for the pavement section. Regarding the plasticity analysis, it is concluded that the assumption to model the behavior of unbound granular materials as elastic in pavement design is correct. The Finite Element Analysis determined that plasticity does have effect on the behavior of the materials with respect to elastic behavior, but there is not a considerable difference in pavement displacement between the two analysis.
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梁志明 y Chi-ming Leung. "Design consultancy vs design and build consultancy: present trends in the construction industry". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31266678.
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Yllén, Johansson Mattias. "Agile project management in the construction industry : An inquiry of the oppurtunities in construction projects". Thesis, KTH, Fastigheter och byggande, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101094.
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Project management is today a current and highly discussed area. How projects within the construction industry are managed has not changed significantly during the last decades. The construction market, the number of different actors and the way that projects are procured today has however changed. This has led to a gap between the managerial view on how construction projects should be conducted today and how they actually are executed. This is reason enough to question this conservative industry and look into what possibilities there might be in the future. The Agile project management approach evolved from the software industry where it has grown and developed through empirical progress. It is suited for large complex projects where it is difficult to specify the product in advance. It is today used in different industries but mostly in the software business where the customer detects their needs through means of repeated tests and improvements to a prototype. This thesis has researched what opportunities there might be in implementing the Agile project management approach in the design phase of construction projects. The major advantages found with implementing the Agile approach is an increase in the client’s involvement. The Agile approach almost forces the client to increase their participation in the project compared to the situation today. It can also decrease uncertainty and improve risk management. By the use of time management and specific meetings it will also be beneficial for keeping track of the project’s progression and status.
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Ajayi, Saheed O. "Design, procurement and construction strategies for minimizing waste in construction projects". Thesis, University of the West of England, Bristol, 2017. http://eprints.uwe.ac.uk/30123/.
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The construction industry contributes the largest portion of waste to landfill, and it consumes a significant proportion of mineral resources excavated from nature. Due to adverse environmental impacts of waste generation, as well as financial gains associated with its minimization, waste intensiveness of the industry has remained a major concern across nations. This study investigates the design, procurement and construction strategies for waste minimization, using a dynamic approach. Apart from an investigation of the key and underlying measures for construction waste mitigation, the study considers the interrelationship between stages of projects' lifecycle. This is as activities carried out at an earlier stage are capable of engendering occurrences at later stages of the dynamic project delivery processes. Following the tenets of critical realism philosophy and exploratory sequential mixed method, the study combined qualitative and quantitative approaches at intensive and extensive stages respectively. At the early stage of the study, data were collected through literature review and focus group discussions with industry experts. Results of the qualitative study were used to develop a questionnaire, which was analysed using statistical approach and structural equation modelling. As a means of investigating the key drivers of waste minimization at a holistic level, a system dynamic model was developed to simulate the interplay and effects of different strategies that were confirmed through the previous process. The study suggests that design stage has the most decisive impacts on construction waste minimization. At this stage, the key dimensions for designing out waste include design for modern methods of construction, collaborative design process, design for standardisation and waste-efficient design documentation. Error-free design and involvement of contractors at early design stage are part of the critical success factors for designing out waste. With design being much important for waste minimization, competencies of design in terms of waste behavioural competency, design task proficiency, construction-related knowledge and inter-professional collaborative competency are essential for designing out waste. Materials procurement process could enhance waste minimization by considering its key dimensions for driving waste-efficient projects, which includes waste-efficient materials purchase management, suppliers' alliance and waste-efficient bill of quantity. Efficient materials take-off and take back scheme are confirmed as critical success factors for driving waste minimization through materials procurement processes. During construction activities, waste could be reduced through prefabrication and offsite technology, contractual requirements, maximisation of materials reuse and improved collaboration, among others. Prefabrication, supply chain alliance and collaborative procurement routes are confirmed as the critical success factors for reducing waste during construction process. Dynamic interplay among these sets of strategies suggests that notwithstanding the significance of the different measures during design, procurement and construction processes, prefabrication technology and collaborative procurement route are the holistic drivers of construction waste minimisation. The study implies that designers could effectively drive waste minimization through dimensional coordination and standardisation of design in line with standard materials supplies. In addition to the need for prefabrication and offsite technologies, increasing collaboration among project team is requisite to reducing waste generated by construction activities. By implementing the strategies suggested in the study, substantial proportion of construction waste would be diverted from landfill.
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Ghalandar, Zehi Jalalabad Toomaj. "Design Quality in Architecture and Construction Research". Thesis, KTH, Fastigheter och byggande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254838.
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The issue of design quality in construction projects has long been a major concern for designprofessionals (Gann et al. 2003). The emphasis on improvement of processes in constructionin order to manage or reduce “cost, time and waste” in projects, at times has led to concernsthat the design of a building could become a matter of less importance due to such processimproving measures (Gann et al. 2003, p.319) “Design Quality” in architecture andconstruction is an ambiguous and “dynamic concept” in relation to its context, continuouslygoing through changes (Rönn 2010, p.48; Slaughter 2004).Quality itself is related to value and multiple definitions of it (Rönn 2010). It is often possiblefor both people and professionals to feel and experience design quality in buildings ratherintuitively, but to frame it in a recognizable manner has always proved challenging (Rönn2010). Essentially, human behavior apart from being influenced by the physical environmentis also influenced by the social context existing within the physical environment (Vischer2008).These challenges further extend to judgement, assessment and measurement of design quality,and setting out the relevant criteria for them (Rönn 2010, Slaughter 2004). Therefore, it’sdifficult for building designers, to structure design solutions that could guarantee theachievement of such ambiguous concept (Rönn 2010).Frågan om designkvalitet i byggprojekt har länge varit ett stort bekymmer för designers (Gannet al. 2003). Betoningen på förbättring av processer inom konstruktion för att hantera ellerminska ”kostnad, tid och slöseri” i projekt har ibland lett till en oro för att utformning ochdesign av en byggnad kan bli av mindre betydelse på grund av sådana processförbättrandeåtgärder (Gann et al. 2003, p.319) ”Designkvalité” i arkitektur och konstruktion är ett tvetydigtoch ”dynamiskt koncept” i förhållande till sitt sammanhang, som ständigt genomgårförändringar (Rönn 2010, s.48; Slaughter 2004).Kvalité i sig är relaterad till värde och flera definitioner av det (Rönn 2010). Det är ofta möjligtför både människor och yrkesverksamma att känna och uppleva designkvalité i byggnaderganska intuitivt, men att rama in den på ett igenkännbart sätt har visat sig utmanande (Rönn2010). I huvudsak påverkas det mänskliga beteendet utöver den fysiska miljön även av densociala kontexten som finns inom den fysiska miljön (Vischer 2008).Dessa utmaningar sträcker sig vidare till bedömning, värdering och mätning av designkvalitéeroch fastställande av relevanta kriterier för dem (Rönn 2010, Slaughter 2004). Därför är detsvårt för byggnadsdesigners att konstruera designlösningar som garanterat kan uppnå ett sådanttvetydigt koncept (Rönn 2010).
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Kobets-Singkh, Olena. "Two mountain huts : architecture of interactive environments through the development of the prototype". Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1390312.
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To build for living is to understand that built form exists only in relationship to the life that occupies it and that human life is better when it is in constant interaction with the built environment; we design it, build it, and change it as we design, build, and change our selves. Making your own place and changing it over time is an important component of living one's life to its fullest. To explore these issues, designs were made for an adaptable building type - the "mountain hut," a temporary accommodation for its wandering inhabitants. Designing it twice, as well as relocating the initial building type across the globe, from the mountains of Sierra Nevada to the Himalayas in Nepal, provided an opportunity to compare and understand the influences of local environmental and cultural conditions on the building's adaptability, as well as the level of interactivity its inhabitants could experience as they occupied and transformed the dwelling. Both designs incorporate sustainable design principles, which strengthen the overall comparison of climatic responses and the use of local materials and building technologies.Department of Architecture
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Wu, Pan. "The Design of High-Frequency Continuous-Time Integrated Analog Signal Processing Circuits". PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/1162.
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High-performance, high-frequency operational transconductance amplifiers (OTAs) are very important elements in the design of high-frequency continuous-time integrated analog signal processing circuits, because resistors, inductors, integrators, mutators, buffers, multipliers, and filters can be built by OTAs and capacitors. The critical considerations for OTA design are linearity, tuning, frequency response, output impedance, power supply rejection (PSR) and common-mode rejection (CMR). For linearity considerations, two different methods are proposed. One uses cross-coupled pairs (CMOS or NMOS), producing OTAs with very high linearity but either the input range is relatively small or the CMR to asymmetrical inputs is poor. Another employs multiple differential pairs (current addition or subtraction), producing OTAs with high linearity over a very large input range. So, there are tradeoffs among the critical considerations. For different applications, different OTAs should be selected. For consideration of frequency response, the first reported GaAs OTA was designed for achieving very-high-frequency performance, instead of using AC compensation techniques. GaAs is one of the fastest available technologies, but it was new and less mature than silicon when we started the design in 1989. So, there were several issues, such as low output impedance, no P-channel devices, and Schottky clamp. To overcome these problems, new techniques are proposed, and the designed OTA has comparable performance to a CMOS OTA. For PSR and CMR considerations, a fully balanced circuit structure is employed with a common-mode feedback (CMF) circuit used to stabilize the DC output voltages. To reduce the interaction of the operation of CMF and tuning of OTAs, three improved versions of the CMF circuits used in operational amplifiers are proposed. With the designed OTAs, a I GHz GaAs inductor with small parasitics is designed using the proposed procedure to reduce high-frequency effects. Two CMOS high-order, high-frequency filters are designed: one in cascade structure and one in LC ladder form. Also, a 200 MHz third-order elliptic GaAs filter is designed with special consideration of very-high-frequency parasitics. All circuits were fabricated and measured. The experimental results were used to verify the designs.
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Köroğlu, Mustafa Hadi. "High frequency integrated filters for wireless applications". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/14458.
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Murty, Anjali. "Highly linear, rail-to-rail ICMR, low voltage CMOS operational amplifer". Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/14884.
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Ginart, Antonio. "Single ended switching analog audio amplifier with dead zone". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/15767.
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Johnson, Kevin Matthew. "Development of a statically balanced parallel platform manipulator". Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/15947.
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Hopkinson, David P. "Development of stress gradient enhanced piezoelectric composite unimorph actuators". Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/16372.
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Szirti, Daniel. "Development of a single-stage implosion-driven hypervelocity launcher". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112585.
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The present study deals with the development of a single-stage implosion-driven hypervelocity launcher. A thin-walled tube filled with helium surrounded by explosives acts as a driver for the launcher. Implosion of the tube drives a strong shock that reflects back and forth between the projectile and the implosion pinch, generating very high temperatures and pressures. Simple analytic models were used to approximate the performance of the pump tube and its use as a driver for a launcher. Experiments to evaluate the implosion dynamics and performance of the pump tube were carried out, and implosion-driven launcher experiments demonstrated muzzle velocities above 4 km/s with 5-mm-diameter aluminum projectiles. Projectile integrity was verified by high-speed photography. Disagreement of experimental data with the analytical models of performance is mostly due to failure to seal the chamber of the launcher, resulting in loss of driver gas, and pump tube expansion, which weakens the precursor shock.
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Cheung, Chi-chuen Cecil y 張志泉. "Device design and fabrication of InGaP/GaAsSb/GaAs DHBTs". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B29753727.
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