Dissertations / Theses: 'Construction rigs'

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Sun, Wei-Yang. "Design and construction of rigs for studying surface condensation and creating anodized metal oxide surfaces." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68860.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 45-46).
This thesis details the design and construction of a rig for studying surface condensation and a rig for creating anodized metal oxides (AMOs). The condensation rig characterizes condensation for different surfaces; this is done with the use of known heat transfer principles to calculate characteristic heat fluxes and heat transfer coefficient values. Preliminary results have been shown to follow predictions derived from existing heat transfer principles, and have confirmed existing literature's assertion of increased effectiveness of dropwise condensation over filmwise condensation. The AMO rig fabricates anodized metal oxide surface samples by subjecting wafers coated with thin metal layers to voltage in the presence of acidic electrolytes. Initial fabricated anodized aluminum oxide (AAO) samples have shown to display the characteristic hierarchal nanopore structure of known fabricated AAO in literature. Both the condensation rig and the AMO rig will be used in current and future condensation and superhydrophobic surface research by the Varanasi group in the MIT Department of Mechanical Engineering.
by Wei-Yang Sun.
S.B.

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Milanez, Maria Kassimati. "Hist?rias de professores universit?rios sobre ensinar ingl?s para fins espec?ficos." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16389.

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This research has as its theoretical and methodological assumptions (1) the Narrative Inquiry (CLANDININ; CONNELLY, 2011), (2) the Systemic Functional Grammar (HALLIDAY, 1985, 1994; THOMPSON, 2002; EGGINS, 1994; HALLIDAY; MATTHIESSEN, 2004) and (3) the English for Specific Purposes Approach (ESP - HUTCHINSON; WATERS, 1987; CELANI, 2005; RAMOS, 2005), and its overall objective is to survey the meanings construed by the participants who are ESP practitioners and have not received a specific education to teach this approach at their undergraduation. The field texts and therefore the analises were divided into two distinct groups: the first with data generated from a questionnaire applied to nine professors from a federal university in the northeast of Brazil, which contains open and closed questions about their training and their experiences in teaching ESP; the second group, focusing this time on the experiences of three professors from the first group who were still teaching ESP, with data generated from interviews with these participants in addition to the data generated from their autobiographies and from the researcher?s as well. The computational tool WordSmith Tools 6.0 (SCOTT, 2012) was used to select, organize, and quantify data to be analyzed in the first group of texts, identifying the types of Processes and Participants through the Transitivity System (HALLIDAY; MATTHIESSEN, 2004). The Processes which were more used by the professors in the questionnaire were the Material, followed by the Relational and then the Mental ones, indicating that most professors reported their actions related to the teaching of ESP, rated or evaluated the approach, their training to teach it and their experiences, hence, rarely showing their thoughts and emotions about teaching ESP. Most of the nine professors say they carry out needs analysis, but not all do it according to the authors cited by them or the ones that are considered a reference in this area, such as the ones used in this research as reference. Similarly, their definitions and conceptions of ESP, in most cases, differed from these authors. All the professors claim not having had specific education to teach ESP at the undergraduation. When examining the stories of the four teachers, in the second group of the field texts, based on meaning composition according to Ely, Vinz, Downing and Anzul (2001), it was revealed that the kind of knowledge they report using when they teach ESP is related to their Personal Practical Knowledge and their Professional Knowledge (ELBAZ, 1983; CLANDININ, 1988). In their autobiographies, metaphors were also identified and they represent their concepts of teaching and being a teacher. Through this research, we hope to contribute to the understanding of what teaching ESP might mean for professors in the researched context and also to the continuing education of ESP practitioners, as well as to a review of the curricula in the English language undergraduate courses and of the role of ESP in the training of these professionals
A presente pesquisa tem como pressupostos te?rico-metodol?gicos (1) a Pesquisa Narrativa (PN CLANDININ; CONNELLY, 2011), (2) a Gram?tica Sist?mico-Funcional (GSF HALLIDAY, 1985, 1994; THOMPSON, 2002; EGGINS, 1994; HALLIDAY; MATTHIESSEN, 2004) e (3) a abordagem de ensino de Ingl?s para Fins Espec?ficos (IFE HUTCHINSON; WATERS, 1987; CELANI, 2005; RAMOS, 2005), com o objetivo geral de fazer um levantamento dos sentidos constru?dos pelos professores participantes sobre o IFE, a forma??o espec?fica que receberam para ministr?-lo e a sua experi?ncia em ensin?-lo no n?vel superior. Os textos de campo e, por conseguinte, as an?lises, foram organizados em dois grupos distintos: o primeiro com dados gerados a partir de um question?rio aplicado a nove professores de uma institui??o p?blica no nordeste brasileiro, contendo perguntas abertas e fechadas a respeito de sua forma??o e de suas experi?ncias em ministrar a disciplina de Ingl?s Instrumental e o segundo grupo, a partir do enfoque nas experi?ncias de tr?s professoras do primeiro grupo que continuavam ensinando IFE, com dados gerados por entrevistas com essas participantes e por suas autobiografias, al?m dos dados gerados pela autobiografia da pr?pria pesquisadora, tamb?m participante da pesquisa. Foi usada a ferramenta computacional WordSmith Tools 6.0 (SCOTT, 2012) para selecionar, organizar e quantificar os dados a serem analisados no primeiro grupo de textos, identificando-se os tipos de Processos e os Participantes, pelo Sistema de Transitividade (HALLIDAY; MATTHIESSEN, 2004), sendo que os Processos mais usados pelos professores no question?rio foram os Materiais, seguidos dos Relacionais e em terceiro lugar os Mentais, indicando que a maioria relatou mais suas a??es com rela??o ao ensino de IFE, classificou ou definiu a abordagem, sua forma??o e suas experi?ncias do que demonstrou seus pensamentos e emo??es a respeito de ensinar IFE. A maioria dos nove professores afirma fazer a an?lise de necessidades, mas nem todos a fazem de acordo com o que estabelecem os autores por eles citados ou outros autores considerados refer?ncia nessa ?rea, tais como os que usamos nesta pesquisa. Do mesmo modo, suas defini??es e concep??es sobre IFE, na maioria das vezes, diferem das desses autores. Todos os professores participantes alegam n?o ter tido forma??o espec?fica para ensinar IFE na licenciatura. Ao analisar os relatos das quatro professoras do segundo grupo de textos de campo, com base na composi??o de sentidos segundo Ely, Vinz, Downing e Anzul (2001), percebeu-se que o tipo de conhecimento que estas referem usar para ministrar IFE est? relacionado ao Conhecimento Pr?tico Pessoal e ao Conhecimento Profissional (ELBAZ, 1983; CLANDININ, 1988). Em seus relatos, foram identificadas tamb?m imagens que representam suas concep??es a respeito de ensinar e ser professora. Esperamos, atrav?s desta pesquisa, contribuir tanto para a compreens?o do que pode significar ensinar IFE para os professores do contexto pesquisado, como para a forma??o continuada de professores de IFE, assim como para uma revis?o nos curr?culos de Letras e do papel do IFE na forma??o do professor de l?ngua inglesa

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Martin, William H. C. "Rapid construction of highly functionalised pyran rings." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415405.

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Banjoko, Oluwakemi O. "A novel cyclization in the construction of fused rings." Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/6894/.

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The discovery of the novel thermal cyclization of enediyne molecules within the Parsons group during studies directed towards the total synthesis of lactonamycin has stimulated an intense research into the cyclization of the enediynes. In this research different functionalised enediynes were synthesised to investigate:- (i) the scope and limitations of the thermal cyclization reactions, (ii) the proposed biradical mechanism for the cyclization reactions, (iii) the intermolecular trappings of the proposed biradical, and (iv) the effect of sterically demanding groups on the rate of cyclization. In the process of testing these objectives, we have been able to synthesize highly functionalised heterocyclic rings by simple thermal cyclization reactions without using any metal catalyst. We have discovered that the cyclizations may have involved free radical mechanism or an ene reaction, followed by a Diels – Alder cycloaddition reactions. Interestingly the cyclised compound 2.1 shows two stereogenic centres at C2 and C4 with an absolute configuration of R and S respectively. An in-depth exploration of the stereochemistry of these reactions may increase their application in controlling the stereochemistry of ring systems through simple metal free thermal cyclization reactions. Confirmation of the specific mechanism constitutes an ongoing research within the Parsons group. Conclusively cyclization of highly functionalised enediynes had been proved to be a versatile route to the synthesis of diverse heterocyclic compounds. The ease of cyclizations of a majority of the enediynes in this study has shown that functionalisation and diversification of the core enediyne systems could be utilized in the synthesis of pharmaceutically important antitumour drugs.

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Xin, Hua (Composer). "Evocative Foreshadowing: The Motivic Construction in "The Legend of Two Rings"." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011770/.

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Azevedo, Ivanilka Lima de. "Reflex?es sobre a constru??o e evolu??o de conceitos geom?tricos nas s?ries intermedi?rias do ensino fundamental." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/14270.

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This thesis represents a didactic research linked to the Post-graduation Programme in Education of the Universidade Federal do Rio Grande do Norte which aimed to approach the construction of the geometrical concepts of Volume of the Rectangular Parallelepiped, Area and Perimeter of the Rectangle adding a study of the Area of the Circle. The research was developed along with students from the 6th level of the Elementary School, in a public school in Natal/RN. The pedagogical intervention was made up of three moments: application of a diagnostic evaluation, instrument that enabled the creation of the teaching module by showing the level of the geometry knowledge of the students; introduction of a Teaching Module by Activities aiming to propose a reflexive didactic routing directed to the conceptual construction because we believed that such an approach would favor the consolidation of the learning process by becoming significant to the apprentice, and the accomplishment of a Final Evaluation through which we established a comparison of the results obtained before and after the teaching intervention. The data gathered were analyzed qualitatively by means of a study of understanding categories of mathematical concepts, in addition to using descriptive statistics under the quantitative aspect. Based on the theory of Richard Skemp, about categorization of mathematical knowledge, in the levels of Relational and Instrumental Understanding were achieved in contextual situations and varied proportions, thus enabling a contribution in the learning of the geometrical concepts studied along with the students who took part in the research. We believe that this work may contribute with reflections about the learning processes, a concern which remained during all the stages of the research, and also that the technical competence along with the knowledge about the constructivist theory will condition the implementation of a new dynamics to the teaching and learning processes. We hope that the present research work may add some contribution to the teaching practice in the context of the teaching of Mathematics for the intermediate levels of the Elementary School
Esta tese se constituiu em uma pesquisa did?tica vinculada ao Programa de P?s-gradua??o em Educa??o da Universidade Federal do Rio Grande do Norte que teve por objetivo abordar ? constru??o dos conceitos geom?tricos de volume do bloco retangular sua ?rea de superf?cie acrescentando um estudo sobre ?rea do c?rculo. Este foi desenvolvido junto a alunos do 6? ano do Ensino Fundamental, em uma escola da rede p?blica de ensino em Natal/RN. A interven??o pedag?gica constou de tr?s momentos: aplica??o de uma avalia??o diagn?stica, instrumento que subsidiou a elabora??o do m?dulo e ensino, ao indicar os conhecimentos pr?vios e fragilidades dos alunos; introdu??o do m?dulo de ensino por atividades e realiza??o de uma avalia??o final atrav?s da qual estabelecemos uma compara??o dos resultados obtidos antes e depois da interven??o de ensino. Os dados obtidos foram analisados qualitativamente mediante estudo de categorias de compreens?o de conceitos matem?ticos, al?m de utilizarmos a an?lise estat?stica validando-a sob o aspecto quantitativo. Com base nos resultados os n?veis de compreens?o relacional e instrumental foram atingidos em situa??es contextuais e propor??es variadas. Acreditamos que este possa contribuir ainda com reflex?es acerca dos processos do conhecer, preocupa??o que permeou todas as etapas da pesquisa. Nossa esperan?a ? que esta pesquisa possa acrescentar alguma contribui??o ao fazer docente no contexto do ensino matem?tico, haja vista concebermos que a compet?ncia t?cnica aliada ao conhecimento sobre a teoria construtivista implementaria uma nova din?mica aos processos de ensino e aprendizagem

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Stjern, Louise. "Design, construction and modelling of an air cleaning test rig." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231423.

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The cleaning technology for exhaust air is an area under constant development. In collaboration with Ozone Tech Systems the project resulted in a lab scale test rig for air cleaning units. The test rig was designed primarily to investigate the mechanisms of an UV reactor as well as the life times of a hydrogen sulphide absorption bed and an activated carbon bed. The thesis consisted in the design of the system, the acquisition of units and the construction of the system followed by the modelling of the pollutant elimination in the UV reactor. Fluid dynamics of the process flow is neglected, while the light distribution is numerically calculated. Two separate pollutants were considered, one being volatile organic compounds represented by acetaldehyde, and the other being hydrogen sulphide, chosen due to their prevalence in exhausts. An experimental plan is developed to validate the model, find model parameters and finally to investigate process parameters in the UV reactor.
Luftföroreningar är ett mycket aktuellt problem, och tekniken för att rena luftströmmar är under ständig utveckling. I samarbete med Ozone Tech Systems designades och byggdes en testrigg för att undersöka olika luftreningsenheter. De primära målen var att undersöka mekanismerna i en UV reaktor samt livslängden för två lika packade bäddar; en absorptionsbädd för divätesulfid samt en adsorptionsbädd av aktiverat kol. Examensarbetet bestod av designmomentet, införskaffande av rätt enheter och konstruktionen av systemet. Även numerisk modellering av UV-reaktorn ingick i projektet, och denna gjordes med störst avseende på UV-ljusets fördelning i reaktorn medan flödesdynamiken försummades.Två olika föroreningar valdes p. g. a. deras frekventa förekomst i luftströmmar som ska renas; divätesulfid och flyktiga organiska ämnen (representerade här av acetaldehyd). Rapporten presenterar även en experimentell plan för att validera modellen, hitta modellens semiempiriska parametrar, samt till slut för att med hjälp av faktoriell design undersöka interaktionen mellan olika faktorer i UV-reaktorn.

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Tan, Chien Yung. "Inventory management of steel plates at an oil rig construction company." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38287.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.
Includes bibliographical references (leaf 67).
Keppel Fels produces make-to-order oil exploration rigs for the global market. Each rig requires close to 6000 metric tons of steel in the course of its production. Optimal management of this steel is very critical in this line of business. However, in recent years, demand for these rigs has been increasing at a tremendous rate and previous steel management policies are fast becoming unable to cope with this surge of demand. The thesis first looks at characterizing the nature of the demand of steel plates in the company. This led to the identification of key factors of demand, resulting in a classification system of the steel plates according to their demand behavior. This system further led to the crafting of various policies to manage the risks involved in the procurement of the steel plates. We propose to use the newsboy model to minimize the inventory costs, subject to uncertain demand. The conclusion of the thesis presents the optimized steel plate procurement quantities for the company.
by Chien Yung Tan.
M.Eng.

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Cramer, Klaron Nathanael. "Design, Construction, and Preliminary Validation of the Turbine Reacting Flow Rig." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243987343.

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Volec, Martin. "Malá vrtná souprava pro vrtání studní." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232188.

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The aim of this thesis is the structural design small drilling rigs for drilling wells. Drilling rig will be used for drilling wells up to 200 mm diameter rotary drilling technology with irrigation water. The first part is a literature search of small drilling rigs. In the second part, then custom design a small drilling rig.

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Larsson, Björn. "Construction of a Calorimetric Test-rig for Loss Measurements on Induction Machines." Thesis, KTH, Elektrisk energiomvandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53677.

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This thesis presents the development and construction of a cooling system and a calorimetric set-up for efficiency measurements on an 11 kW induction machine. Direct and indirect methods of efficiency determination and loss segregation is presented. An analytical thermal model of the machine is used for the estimation of different motor temperatures. The results are verified by measurements. The methodology for calibration of the specific set-up is presented and performed. An accuracy of ・} 5 mK for the calorimetric temperature measurements is obtained. Measurements have been performed in order to determine the thermal leakage of the test-setup. It was found that the main leakage path is through the rotor shaft. According the the measurements performed, this leakage is lower than 1.6 % of the active input power.

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Shepperson, Leigh. "Constructing self injective graded rings with a view towards the generating hypothesis." Thesis, University of Sheffield, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575453.

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We develop theory, and construct examples, of graded rings that have properties similar to the conjectured form of the stable homotopy group of the p-completion of the sphere spectrum π*(Sp) in the p-local stable homotopy category. In particular, these rings are non-Noetherian self injective connected graded rings of finite type that contain at least one non-nilpotent element. Moreover, we also construct examples of non-Noetherian graded rings that have properties similar to the conjectured form of the ring π* (Sp), yet fail to be self injective as graded rings. These examples have an extremely complicated structure, and they also provide counter examples to potential converses to the main theory of self injective graded rings.

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Calleja, Ramos Pilar. "Gold-Catalyzed Synthesis of 5 and 6-Membered Rings for the Construction of Molecular Diversity." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/440511.

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La Investigació desenvolupada en aquesta tesi doctoral comprén des de la síntesi de compostos poliaromàtics fins a la preparació de diversos compostos naturals, destacant l'habilitat de la catàlisi homogènia d'or per la construcció de diversitat molecular. D'una banda, s'ha desenvolupat un nou procediment per la síntesi d'un nou fullerè C60 obert mitjançant l'ús d’un triple acoblament catalitzat per Pd de quatre fragments de trindè C15. L'esquelet del motiu central trindè C15 es va construir mitjançant una triple ciclació oxidant catalitzada per or(I). D'altra banda, l’abast de la reacció de cicloaddició intramolecular [2 + 2 + 2] catalitzada per or(I) es va estendre a oxo-1,5-enins amb grups O-homopropargílic i alílic protegits. Sota les condicions de reacció optimitzades, la ciclació té lloc amb rendiments entre moderats i excel·lents (38-90%) i presenta una major selectivitat en la majoria dels casos, proporcionant accés a octahidro-1H-indenos substituits. Per últim es va realitzar un estudi mecanístic detallat de les transposicions d'esquelet en diversos 1,6-enins amb grups OR a la posició propargílica, els quals són propensos a experimentar una migració-1,5 del grup alcoxi- en absència de nucleòfils al ser tractats amb catalitzadors d’or. Respecte a l'ús de la catàlisi de l'or per a la síntesi de productes naturals, s'ha desenvolupat una reacció enantioselectiva d’alcoxiciclació, que pot ser aplicada a la construcció de l'esquelet principal dels carexans. Adicionalment, s'ha utilitzat la reacció de cicloaddició intramolecular [4 + 2] catalitzada per or(I) per a la formació de l'esquelet 6,6,5-tricíclic de les pycnanthuquinones, una altra família d'alcaloids.
La investigación desarrollada en esta tesis doctoral abarca desde la síntesis de compuestos poliaromáticos hasta la preparación de varios compuestos naturales, destacando la habilidad de la catálisis homogénea de oro para la construcción de diversidad molecular. Por una parte, se ha desarrollado un nuevo procedimiento para la síntesis de un nuevo fullereno C60 abierto mediante un triple acoplamiento catalizado con Pd de cuatro fragmentos de trindeno C15. El esqueleto del motivo central trindeno C15 se construyó mediante una triple ciclación oxidante catalizada por oro(I). Por otra parte, el alcance de la reacción intramolecular de cicloadición [2 + 2 + 2] catalizada por oro(I) se extendió a oxo-1,5-eninos con grupos O-homopropargílico y alílico protegidos. Usando las condiciones de reacción optimizadas, la ciclación tiene lugar con rendimientos de moderados a excelentes (38-90%) y una mayor selectividad en la mayoría de los casos, proporcionando acceso a octahidro-1H-indenos sustituidos. En cuanto al uso de la catálisis del oro para la síntesis de productos naturales, se ha desarrollado una reacción enantioselectiva de alcoxiciclación, que puede ser aplicada en la construcción del esqueleto principal de los carexanos. Además, se ha utilizado la reacción de cicloadición intramolecular [4 + 2] catalizada por oro(I) para la formación del esqueleto 6,6,5-tricíclico de las pycnanthuquinonas, otra familia de alcaloides. Por último, se realizó un estudio mecanístico detallado de las transposiciones de esqueleto en diversos 1,6-eninos con grupos OR en la posición propargílica, los cuales son propensos a experimentar una migración-1,5 del grupo alcoxi- en ausencia de nucleófilos al ser tratados con catalizadores de otro.
The research developed in this Doctoral Thesis comprises from the synthesis of polyaromatic compounds to the preparation of various naturally occurring quinonoid compounds (natural product synthesis), highlighting the proficiency of homogeneous gold catalysis for the construction of molecular diversity. On the one hand, a novel approach for the synthesis of a new crushed fullerene C60 by a threefold Pd-catalyzed cross-coupling of four C15 trindene fragments has been developed. The central motif’s trindene C15 skeleton was constructed through a triple gold(I)-catalyzed oxidative cyclization. On the other hand, the scope of the intramolecular gold(I)-catalyzed [2+2+2] cycloaddition reaction was extended to O-protected homopropargylic and allylic oxo-1,5-enynes. Under the optimized reaction conditions, the cyclization takes place with moderate to excellent yields (38–90%) and increased selectivity in most of the cases, providing access to substituted octahydro-1H-indenes. Concerning the use of gold catalysis for the synthesis of natural products, we have developed an enantioselective gold(I)-catalyzed enyne alkoxycyclization, which can be applied for the construction of the carexanes core skeleton. Additionally, the intramolecular gold(I)-catalyzed [4+2] cycloaddition reaction has been used for the construction of the 6,6,5-tricyclic skeleton of the pycnanthuquinones, another family of alkaloids. Finally, a detailed examination of gold(I)-catalyzed skeletal rearrangements of model 1,6-enynes bearing OR groups at the propargyl position, which are prone to undergo intramolecular 1,5-migration in the absence of external nucleophiles, was performed.

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Björk, Lars. "Construction of cooling rig and investigation of cooling sensitivity for aluminum crash alloy." Thesis, KTH, Materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160902.

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The work presented in this master thesis deal with the issue of quenching, investigation regarding different cooling rates and its effect on the material properties of aluminum alloy in the 6xxx series used for crash purposes in cars, such as crash boxes, beams and other crash relevant parts. Precipitation of Mg2Si due to different cooling rates affects the material properties such as crash performance, thus the aluminum alloy used is sensitive to different cooling rates. In order to perform tests with different cooling rates a cooling rig was constructed. In order to evaluate the different cooling rates both mechanical testing such as tensile test and 3-point bending test and compression test were performed. Also analyses with scanning electron microscope/energy-dispersive x-ray spectroscopy were performed to estimate grain boundary decoration of Mg2Si due to the different cooling rates. Furthermore LOM analyses were performed to evaluate if the experimental setup had any effect on material properties such as grain size. The constructed cooling rig produced different cooling rates with reliable repeatability as intended. Cooling rates between 130 ̊C/s and 20 ̊C/s were accomplished. Mg2Si occurred in all investigated test samples with various amounts. Higher cooling rates decreases the precipitation of Mg2Si to the grain boundaries, higher cooling rates also increased the bending angle achieved from the 3-point bending test. Furthermore, extensive solution heat treatment at elevated temperatures leads to grain growth.

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Skytte, af Sätra Ulf. "Wear of piston rings in hydrostatic transmissions." Doctoral thesis, KTH, Machine Design (Div.), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-432.

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This study focuses on the wear of piston rings in a hydraulic radial piston motor. The piston ring has to satisfy increasing demands for reliability and longer service life. It has two contacting surfaces, the face and the flank, and operates under a boundary lubrication state.

This first part of the project aimed to detect and characterise piston ring wear. Measurement by weighing gives an overall value for wear defined as loss of mass. Two-dimensional form and surface roughness measurements show the distribution of wear on the piston ring face in contact with the cylinder bore and the piston ring flank in contact with the piston groove. Three-dimensional analyses, both quantitative and qualitative, allow the wear mechanisms to be identified.

The wear of piston rings from an actual hydraulic motor was characterised. As well, rig testing was performed in two different test rig set-ups, one simulating the sliding movement of the piston ring and the other the tilting movement at the end of the strokes. Wear during the running-in period was investigated, and the findings indicate that the period when this takes place is of short duration. In the long term, mild wear makes the surfaces smoother than they were when new, resulting in a very low wear coefficient. Significant levels of wear were measured on both contacting surfaces of the piston ring. In cases in which the flank exhibits more wear than the face, the wear on the flank can be reduced by proper design of the piston groove.

The second part of the project aimed to evaluate use of a textured surface for the cylinder bore counter surface and a coated surface for the piston ring. Three modelling experiments were performed to characterise the friction and wear properties under lean boundary lubrication conditions. Under such conditions, textured surfaces have the advantage of retaining more lubricant and supplying it over a longer time. Stable friction was also a distinctive feature of the textured surface. Use of a coating could also possibly reduce the amount of wear. Though a smooth surface, like a polished one, is hard to beat for a working texture, a coated surface is far ahead of a smooth uncoated one. Different manufactured and commonly used cylinder bore surfaces, including textured ones, were evaluated in the sliding movement test rig. That allowed favourable wear properties, such as lowest wear coefficient, to be determined with the use of a roller burnished surface.

A final part of the research involved simulating wear on the piston ring face throughout the entire service life of a hydraulic motor. This allowed us to determine the roles of surface roughness and coating in prolonging service life and achieving acceptable and secure piston ring operation. The model is simple and realistic, but still needs to be refined so as to correspond even better to reality.

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Harley, Grant L., Henri D. Grissino-Mayer, Lisa B. LaForest, and Patrick McCauley. "Dendrochronological Dating Of The Lund-Spathelf House, Ann Arbor, Michigan, USA." Tree-Ring Society, 2011. http://hdl.handle.net/10150/622642.

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The Lund-Spathelf House is located at 1526 Pontiac Trail in Ann Arbor, Michigan. During a recent renovation, the owner sought information regarding the construction of the house by searching through numerous written records. Despite an extensive history of the land on which the house currently sits, neither a construction year nor general period of construction could be obtained. Therefore, four samples of oak (Quercus spp.) were extracted from floor boards throughout the house for dendrochronological dating. The four samples crossdated conclusively with each other both visually and statistically and were used to build a floating 126-year tree-ring chronology. We used COFECHA to statistically evaluate the absolute temporal placement of this chronology against a nearby regional chronology (MI005.CRN) from the Cranbrook Institute, Michigan. The Lund-Spathelf House chronology was anchored in time with the regional chronology from A.D. 1720 to 1845 with a correlation coefficient of 0.62 (p < 0.0001, t < 8.76, n = 126). All four oak samples provided conclusive cutting dates of A.D. 1845, indicating the year the Lund-Spathelf House was constructed.

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Dutilleul, Pierre, and Claudine Till. "Detection of Atypical Years in the Tree-Ring Series by Construction of a Temporal Walk in the Principal Components Planes." Tree-Ring Society, 1989. http://hdl.handle.net/10150/261884.

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The purpose of this paper is to introduce a method for identifying years of anomalous radial growth, which are called atypical years and are characterized by particularly narrow rings for certain trees or sites, and wide for the others. With this aim, we use principal components analysis (PCA) of tree -ring series, where years are the variables and trees or sites are the individuals, even though in classical dendrochronological applications of PCA, the trees or sites are considered as variables and the years as cases. The relevant method is explained and results are given for five cedar forests (Cedrus atlantica (Endl.) Carrière) in Morocco.

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Tekin, Koray Serdar. "Design And Construction Of Boundary Lubricated Bearing Test Rig And Wear Analysis In Earthmoving Machinery." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612751/index.pdf.

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Excavators which used as earthmoving machinery are exposed to heavy loads and operate long hours repeatedly. The forces that are transmitted trough pin bearings are observed to cause failure due to wear. Therefore, durability of bearings is crucial for excavators. The aim of this study is to perform wear analysis of excavator bearings running in boundary lubrication regime. A hydraulically powered test rig, which simulates the operating conditions of excavator bearings is designed and constructed. Wear is obtained applying both force and relative motion between pin and bearing on the test rig. Several tests are performed in this test bench. Force and material type are varied as the factors influencing wear. Results are compared and the effects of the factors on wear are determined.

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Robichaud, André, and Colin P. Laroque. "Dendroarchaeology In Southwestern Nova Scotia And The Construction Of A Regional Red Spruce Chronology." Tree-Ring Society, 2008. http://hdl.handle.net/10150/622567.

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Dendrochronology studies in Atlantic Canada are rare partly because old-growth forests are scarce making it difficult to establish multiple-century tree-ring chronologies. One approach to overcome this problem is to use tree-ring records found in the wood of historical structures. For our study, the Sinclair Inn in Annapolis Royal, Nova Scotia, was selected for a dendroarchaeological assessment because of its rich and complex history: it resulted from the merging of two early 18th Century houses (the Soullard and Skene houses). To date the Sinclair Inn, three other historical structures of a younger age were used to establish an annual ring record in lieu of old-growth forest data. Red spruce (Picea rubens), a dominant tree species in the Maritimes, was the most prominent wood found in the structures and allowed for the creation of a regional red spruce reference chronology extending far enough into the past to cover the supposed period of construction of the Sinclair Inn. Crossdating results indicate cutting dates of 1709 and 1710 for the Skene and Soullard houses, respectively, and 1769 for the inn itself. In the process of dating the structure, a ,200-year long regional floating red spruce chronology (1591–1789) was developed that will further help future dendrochronological investigations in the Maritimes.

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Klippås, Joel. "Hertz contact influence on acoustic emission signals originating in radial bearings : Test rig construction and experimental evaluation." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70088.

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During the project a test rig was constructed in which experiments were performed on radial bearings to evaluate the acoustic emission amplitude and RMS value of the signal. The acoustic emission amplitude depends on the Hertz contact time, i.e. the time it takes for the Hertz contact to roll over its own contact length. When the load remains constant on the bearing the Hertz contact time is directly reliant on the rotational speed of the inner ring of the bearing. Two experiments were performed, one on a spherical roller bearing and another identical experiment on a spherical ball bearing. Throughout both experiments the load on the bearing remained constant and the rotational speed of the inner ring was changed, the response of the speed change was measured using an acoustic emission sensor. The experiments found a quadratic dependency between the amplitude of the acoustic emission signal and the rotational speed of the inner ring. During the experiments the bearings were lubricated using grease and a total of 195 measurements were performed on each type of bearing at 13 different rotational speeds ranging between 1 and 3000 RPM.

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Chin, Melanie Soo, and m. chin@cqu edu au. "Towards a Reinterpretation of the Radical Theory of Associative Rings Using Base Radical and Base Semisimple Class Constructions." Central Queensland University. Computer Science, 2004. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20050411.102928.

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This research aims to refresh and reinterpret the radical theory of associative rings using the base radical and base semisimple class constructions. It also endeavours to generalise some results about ideals of rings in terms of accessible subrings. A characterisation of accessible subrings is included. By applying the base radical and base semisimple class constructions to many of the known results in established radical theory a number of gaps are uncovered and closed, with the goal of making the theory more accessible to advanced undergraduate and graduate students and mathematicians in related fields, and to open up new areas of investigation. After a literature review and brief reminder of algebra rudiments, the useful properties of accessible subrings and the U and S operators independent from radical class connections are described. The section on accessible subrings illustrates that replacing ideals with accessible subrings is indeed possible for a number of results and demonstrates its usefulness. The traditional radical and semisimple class definitions are included and it is shown that the base radical and base semisimple class constructions are equivalent. Diagrams illustrating the constructions support the definitions. From then on, all radical and semisimple classes mentioned are understood to have the base radical and base semisimple class form. Subject to the constraints of this work, many known results of traditional radical theory are reinterpreted with new proofs, illustrating the potential to simplify the understanding of radical theory using the base radical and base semisimple class constructions. Along with reinterpreting known results, new results emerge giving further insight to radical theory and its intricacies. Accessible subrings and the U and S operators are integrated into the development. The duality between the base radical and base semisimple class constructions is demonstrated in earnest. With a measure of the theory presented, the new constructions are applied to examples and concrete radicals. Context is supported by establishing the relationship between some well-known rings and the radical and related classes of interest. The title of the thesis, Towards a Reinterpretation of the Radical Theory of Associative Rings Using Base Radical and Base Semisimple Class Constructions, reflects the understanding that reinterpreting the entirety of radical theory is beyond the scope of this work. The conclusion includes an outlook listing further research that time did not allow.

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Grissino-Mayer, Henri D. "Preface: An Introduction To Dendroarchaeology In The Southeastern United States." Tree-Ring Society, 2009. http://hdl.handle.net/10150/622590.

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Dendroarchaeology has a discontinuous history in the Southeastern United States, mostly because of misconceptions (the Southeast is too mesic), bad sampling practices (no standard protocol exists for preserving prehistoric wood samples), and a lack of reference tree-ring chronologies long enough to date wood from the abundant prehistoric sites. The majority of archaeological applications in recent years has focused on the dating of historic sites and structures to verify the documented year(s) of construction largely in response to requests from historical agencies to verify when a particular structure was built. We have found that most structures are one to two generations younger than their reported date(s) of construction, but most agencies find this information useful as tree-ring dating lends historical credibility to any site. The future of dendroarchaeology in the Southeast is encouraging but many more trained experts are needed to meet the demand of dating historical structures and sites. Furthermore, once a sampling protocol becomes standardized for retrieving wood from prehistoric sites, the potential for absolute dating of these sites is enormous given that abundant wood is archived in locations throughout the Southeast.

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Mann, David F., Henri D. Grissino-Mayer, Charles H. Faulkner, and John B. Rehder. "From Blockhouse To Hog House: The Historical Dendroarchaeology Of The Swaggerty Blockhouse, Cocke County, Tennessee, U.S.A." Tree-Ring Society, 2009. http://hdl.handle.net/10150/622600.

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The Swaggerty Blockhouse has historical and cultural significance for Tennessee because it is believed to be the only remaining 18th Century blockhouse in the state. We incorporated analyses of artifacts obtained from archaeological excavations coupled with tree-ring dating techniques to determine the possible year of construction of the structure. A nearby reference tree-ring chronology from Norris Dam anchored the Swaggerty Blockhouse tree-ring chronology from 1674 to 1859. The assemblages of artifacts (nails, ceramics, and window glass) recovered from the site corroborated the construction date and provided a clear understanding of the structure’s use as a barn for storage and hog processing. Based on our analyses, the historic Swaggerty ‘‘Blockhouse,’’ originally believed to have been built by James Swaggerty in 1787, is instead a small cantilever barn built by Jacob Stephens in 1860 and used for hog farming.

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Magnus, Nicholas Andrew. "Synthesis of the anthraquinone portion of dynemicin A : Taxanes chiral construction of the A, B and C rings of taxol." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319045.

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Engstedt, Andreas. "Arenabygget, ris eller ros? : en hedonisk prisstudie av kommuninvånarnas värdering av den nya arenan." Thesis, Uppsala universitet, Nationalekonomiska institutionen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-248036.

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This study is an examination of the stadium fever prevailing in Sweden. It is built stadiums in Sweden as never before. The high cost of these constructions end up in the end at the Swedish taxpayers. The study examines through the hedonic pricing of real estate how local residents value the new stadiums. The result indicates that local residents put a positive value in the costly and sumptuous buildings. The study includes 44 stadium constructions in 37 municipalities and is the first of its kind in Sweden.
Denna studie är en granskning av den arenafeber som råder i Sverige. Det byggs idrottsarenor i Sverige som aldrig förr. De stora kostnaderna för dessa byggen hamnar i slutändan hos de svenska skattebetalarna. Studien undersöker genom hedonisk prissättning av fastighetsmarknaden hur kommuninvånarna värderar de nya arenorna. Resultatet indikerar att kommuninvånarna lägger ett positivt värde i de kostsamma och praktfulla byggena. Studien omfattar 44 arenabyggen i 37 kommuner och är den första i sitt slag i Sverige.

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Quesada, Zeljkovic Joaquin. "Construction of a Heat Transfer Rig based on Energy Balance for Rapid Production of Correlations for Additively Manufactured Geometries." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264258.

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This thesis has set the first milestones towards building a Nusselt number correlation that adapts to the current state of art designing and manufacturing processes at Siemens Industrial Turbomachinery AB, focusing on cooling mini-channels produced with Additive Manufacturing. Additive manufacturing (AM), also known as 3D printing, is a gamechanger technology that has revolutionised manufacture and design know-how, bringing down production cost, time and waste. There are techniques within AM that can be applied in the gas turbine industry. Particularly, Selective Laser Melting (SLM) can be utilised to build high-temperature-alloy components without the design constraints imposed by conventional manufacturing. However, when assessing the performance of these AM components, challenges arise due to surface roughness inherent to the SLM process. The goal is to assess SLM parts for a specific application: thermal performance of AM cooling minichannels. This thesis presents the design, construction and validation of a heat transfer experimental rig, capable of assessing the Nusselt number in SLM single mini-channel samples. The SLM samples vary in the material alloy used for its fabrication, the shape of the mini-channel, and hydraulic diameter. The results show that SLM channels have a higher Nusselt number than smooth, conventionally manufactured channels. This heat transfer enhancement comes at a cost: an increased friction factor coefficient, which was the subject of study in a parallel thesis conducted in the same facilities. The relative friction growth of an SLM sample is significantly higher than the increase in relative Nusselt number for the same SLM when compared to the smooth channel performance. These results are aligned with the expectations, matching the general trends observed in the literature. However, some contradictions with other studies were obtained: surface roughness, the key factor affecting flow performance, yielded inconclusive effects for the results obtained in the present thesis. Further assessment and validation of the heat transfer rig built is to be pursued.
Denna studie är det första steget mot att bygga en test rigg för att ta fram Nusselt-korrelationer av additivt tillverkade minikaaler. Vid Siemens Industrial Turbomachinery AB anses dessa har stor potential i kylapplikationer. Additiv Tillverkning (AM) även känd som 3D-printing, är en ”gamechanger” som har revolutionerat tillverkning och design men som även har potential att minska produktionskostnader, tid och avfall. Det finns tekniker inom AM som kan tillämpas i gasturbnindustrin. Exempelvis kan Selective Laser Melting (SLM) avändas för att bygga högtemperaturkomponenter utan de konstruktionsbegränsningar som finns inom konventionell tillverkning. När man bedömer prestandan för dessa AM-komponenter uppstår emellertid utmaningar på grund av ytråheten som är ett resultat av SLM-processen. Målet för detta examensarbete var att utvärdera SLM geometrier för en specifik applikation: termisk prestanda hos AM-kylkanaler. Denna studie presenterar konstruktion och validering av en experimentell rigg för värme¨verföring som levererar Nusselt-tal för SLM tillverkade minikanaler. Tesobjekten är tillverkade i olika material och med varierande geometri. Resultaten visar att SLMkanalerna har högre värmeöverföring än släta, konvetionellt tillverkade kanaler. Denna värmeöverföringsförbättring ackompanjeras dock av en höjning av tryckförluster vilket visades i en tidigare studie vid Siemens Industrial Turbomachinery AB. Resultaten visar att den relativa friktionstillväxten för ett SLM-prov är signifikant högre än ökningen av det relativa Nusselt-talet jämfört med en ”smooth” kanal. Dessa resultat är i linje med förväntingarna och andra publicerade studier i området. Däremot hade ytråheten en överraskade liten effekt på värmeöverföringen i denna undersökning vilket innebär att ytterligare utvärdering och validering av den byggda värmeöverföringsriggen kommer att genomföras.

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Stambaugh, Michael C., and Richard P. Guyette. "Progress In Constructing A Long Oak Chronology From The Central United States." Tree-Ring Society, 2009. http://hdl.handle.net/10150/622610.

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We describe methods and progress in developing the American Long Oak Chronology (ALOC), an effort to construct an oak tree-ring chronology from the Central US that spans the Holocene. Since 2000, we have collected and measured ring widths on over 550 pieces of subfossil oak (Quercus) wood. Over 330 oak samples have been radiocarbon dated, with ages ranging up to 14,000 cal yr B.P. A 1,093- year-long tree-ring record has been constructed from live and subfossil bur oaks (Q. macrocarpa Michx.) and swamp white oaks (Q. bicolor Willd.) growing along and buried in sediments of streams that flow through northern Missouri and southern Iowa, USA. Here we describe the ALOC for the period A.D. 912–2004 to demonstrate its dendrochronological value, display the material quality, and emphasize the importance of chronology construction. We also report on progress in developing older floating chronologies. The development of more long, multi-millennium chronologies will be an important contribution to dendroclimatology. These chronologies will be particularly useful to the Central US, a region with a continental climate and limited temporal depth of annually resolved paleorecords. Perhaps more critical is its location in the middle of one of the most important agricultural regions in the world.

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Lewis, Daniel B., Whitney L. Nelson, Henri D. Grissino-Mayer, Edward R. Cook, and Robbie D. Jones. "Dendrochronological Dating Of Eastern Red Cedar (Juniperus Virginiana L.) Logs From Alfred's Cabin, The Hermitage, Home Of President Andrew Jackson." Tree-Ring Society, 2009. http://hdl.handle.net/10150/622596.

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Alfred Jackson was an enslaved African American born on The Hermitage plantation (outside Nashville, Tennessee) of President Andrew Jackson around 1810, and lived most of his life on the plantation. Staff from The Hermitage wished to better understand and interpret lifeways of those once enslaved on the plantation, but the date of construction of Alfred’s Cabin first had to be determined. Was it built when Alfred was enslaved or was a freedman? We extracted nearly 100 core samples from eastern red cedar logs used to construct the cabin. Of these, 39 cores were used to develop a master tree-ring chronology for the cabin. Crossdating of the Alfred’s Cabin chronology was accomplished using an eastern red cedar chronology developed by the Lamont-Doherty Earth Observatory Tree- Ring Laboratory at Columbia University in Palisades, New York. The 39 series from Alfred’s Cabin resulted in a high-quality master tree-ring chronology, with an average inter-series correlation of 0.66 and an average mean sensitivity of 0.28. Graphical (skeleton plot and line plot) comparison and statistical crossdating with COFECHA anchored the Alfred’s Cabin chronology firmly between 1749 and 1842 (r = 0.45, n = 94 yrs, t = 4.83, p < 0.0001). Cutting dates of these 39 trees ranged from 1841 to 1843. This latter date indicates that the final trees used to construct the cabin were harvested in spring or early summer of 1843, with final construction of Alfred’s Cabin occurring soon after.

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Jonsson, Åsa, and Grim Skarsgård. "Synchrotron tomography of pressboard during in-situ compression loading : Construction of compression rig, image acquisition procedure and methods for image processing." Thesis, Uppsala universitet, Tillämpad mekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-257276.

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Pressboard, a high density cellulose-based material used for insulation in high voltage power transformers, exhibits stress relaxation during compressive loading. Investigating the micro-mechanical mechanisms responsible for the relaxation can lead to modifications of the production process to control the behaviour of the material. This investigation can be done using Synchrotron X-ray micro Computed Tomography which provides sufficient temporal and spatial resolutions to capture the stress relaxation process. In the present thesis, a compression rig for in-situ mechanical loading during X-ray micro Computed Tomography was designed and constructed. Local tomography scans with sub-micrometre resolution were obtained at the TOMCAT beamline at the Swiss Light Source, Paul Scherrer Institut, Switzerland. Several fibre segmentation techniques are analysed, together with Optical Flow and Digital Volume Correlation (DVC), methods used for estimating displacement, strain and velocity vector fields. Suitability of the tested methods is evaluated, and it is found that segmentation of individual fibres in a cellulose material of such a high density is probably not possible using currently available segmentation techniques. The movements during relaxation are measurable at the used resolution, and can be estimated using Optical Flow. Further work into correction of image shift due to rig movement between scans, as well as image artefact reduction should allow for measurement and comparisons of displacement during relaxation as well as DVC-computed strain measurements during compression, recreating earlier results.

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Marchal, Alexandre. "Larch hybrid vigor and role of the phenotypic plasticity in the construction of heterosis." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2014/document.

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Le mélèze d'Europe (Larix decidua) est traditionnellement exploité pour son bois de qualité. Malheureusement, la culture de cette essence hors de son aire de distribution a été un échec. L'hybridation avec le mélèze du Japon (L. kaempferi) est une voie prometteuse, en particulier grâce à l'hétérosis manifesté par cet hybride. Au cours de cette dissertation, nous valorisons les données d'un diallèle multi-site intra- et inter-spécifique d'âge avancé. Le 1er chapitre présente l'analyse de traits de production et de qualité du bois. Nous confirmons ainsi l'hétérosis pour les traits liés au volume. Cet hétérosis n’entraîne pas de contrepartie en termes de qualité, et se montre stable d'un site à l'autre.Au contraire, d'autres traits ne présentent pas d'hétérosis, mais davantage d'héritabilité.Les performances additives pour ces traits sont stables d'un site à l'autre, et en espèce pure vs. en hybridation. Au cours du 2ème chapitre, nous nous intéressons au rôle de la plasticité phénotypique de traits de formation du bois dans la construction de l'hétérosis.Le mélèze hybride apparaît comme le taxon le plus plastique : tout comme ses espèces parentes, il produit un cerne de croissance étroit en conditions hydriques limitantes, mais sa croissance radiale surpasse celle de ses parents quand l'eau est abondante. Ce 2èmechapitre est également un premier pas vers la compréhension du rôle de la plasticité phénotypique dans la construction de l'architecture de la variance génétique entre la circonférence et la densité des troncs. Cette thèse se termine sur une synthèse, au cours de laquelle nous discutons les retombées de nos résultats pour l'amélioration du mélèze hybride
European larch (Larix decidua) has been historically exploited within its natural rangefor its high quality wood, but the attempt to grow this species outside its native range was a failure. Hybridization with Japanese larch (L. kaempferi) is a promising path, in particular because of the heterosis this hybrid manifests. In this dissertation, we took advantage ofan old-enough, multi-site experiment with an inter-/intra-specific mating design. The first chapter presents the analysis of several traits involved in wood quality and productivity. We confirmed heterosis for volume related traits. The heterosis came with no counter part inwood quality, and it was stable across sites. Contrarily, some other traits showed no heterosis but higher heritabilities, and the additive performances for these traits were stable across sites and in pure species vs. in hybridization. In the second chapter, we investigated the role of phenotypic plasticity of some wood formation traits in the construction of the heterosis. Hybrid larch appeared as the most plastic taxon: it equaled the parental controls in producing narrow growth increments under drought, but it produced the largest rings in favorable water availability conditions. This second chapter was also a first step towards a better understanding of the role of phenotypic plasticity on the construction of the genetic variance architecture between larch stem circumference and density. The dissertation ends with a synthesis in which we discussed the implicationof our findings for the breeding of hybrid larch

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Peyron, David. "La construction sociale d'une sous-culture : l'exemple de la culture geek." Thesis, Lyon 3, 2012. http://www.theses.fr/2012LYO30089.

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Cette étude porte sur la « culture geek » et son émergence en tant que sous-culture et identité culturelle revendiquée en France depuis le milieu des années 2000. En effet, ce mouvement d’abord américain a fait une entrée remarquée dans l’espace public qui incite à s’interroger sur sa réalité sociologique. Les geeks sont abordés ici comme fans de mondes imaginaires fantastiques (science-fiction, fantasy…), passionnés de nouvelles technologies et en tant que public premier et fondateur du processus de convergence culturelle théorisé par Henry Jenkins. La montée en visibilité du phénomène geek est ainsi liée dans cette étude à celle de pratiques médiatiques associées à ce processus (fanfictions, démocratisation des outils numériques, œuvres transmédiatiques et immersives, etc.). Dans ce cadre, le tournant réflexif (vers un sentiment d’appartenance à une identité collective) et la mode médiatique autour de la culture geek ces dernières années trouvent leurs racines dans les moments fondateurs de la convergence culturelle (depuis les pulps fictions et la naissance des comic books jusqu’à la sortie de Star Wars, du Seigneur des anneaux, des premiers jeux de rôles et jeux vidéo). Mais cela doit aussi à la radicalisation récente des croisements médiatiques, des pratiques participatives, de la mondialisation des partages liée aux technologies numériques et au passage des identités prescrites aux identités choisies dans les sociétés contemporaines marquées par l’individualisme
This dissertation is about « geek culture » and the emergence of this subcultural identity in recent years in France. This movement, born in North America, has entered the public sphere in a spectacular way and it encourages us to study its sociological reality. Geeks are seen here as fans of imaginary worlds (science-fiction, fantasy…), new technologies lovers, and as first and original audience of the process of cultural convergence defined by Henry Jenkins. The increasing visibility of the geek phenomenon is connected to many practices associated with this process (fanfictions, wide use of digital technology, transmedia and immersive storytelling, etc.). From this point of view, the reflexive moment (the feeling of being part of a collective identity) and the geek trend are both rooted by the beginnings of cultural convergence (from the pulp fictions, and the birth of comic books, to the release of Star Wars, the Lord of the Rings and the first role-playing or video games). It also has to do with the recent growth of links between media, with the success of participatory culture, the possibility of worldwide share thanks to digital technologies and the shift from preassigned identities to chosen ones in our individualistic society

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Vonseel, Audrey. "Hyperbolicité et bouts des graphes de Schreier." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD025/document.

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Cette thèse est consacrée à l'étude de la topologie à l'infini d'espaces généralisant les graphes de Schreier. Plus précisément, on considère le quotient X/H d'un espace métrique géodésique propre hyperbolique X par un groupe quasi-convexe-cocompact H d'isométries de X. On montre que ce quotient est un espace hyperbolique. Le résultat principal de cette thèse indique que le nombre de bouts de l'espace quotient X/H est déterminé par les classes d'équivalence sur une sphère de rayon explicitement calculable. Dans le cadre de la théorie des groupes, on montre que l'on peut construire explicitement des groupes et des sous-groupes pour lesquels il n'existe pas d'algorithme permettant de déterminer le nombre de bouts relatifs. Si le sous-groupe est quasi-convexe, on donne un algorithme permettant de calculer le nombre de bouts relatifs
This thesis is devoted to the study of the topology at infinity of spaces generalizing Schreier graphs. More precisely, we consider the quotient X/H of a geodesic proper hyperbolic metric space X by a quasiconvex-cocompact group H of isometries of X. We show that this quotient is a hyperbolic space. The main result of the thesis indicates that the number of ends of the quotient space X/H is determined by equivalence classes on a sphere of computable radius. In the context of group theory, we show that one can construct explicitly groups and subgroups for which there are no algorithm to determine the number of relative ends. If the subgroup is quasiconvex, we give an algorithm to compute the number of relative ends

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Wendland, David, Alonso María Aranda, and Alexander Kobe. "The Vault with Curvilinear Ribs in the "Hall of Arms" in the Albrechtsburg Meissen: Studies on the Concept, Design and Construction of a Complex Late Gothic Rib Vault." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-167919.

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The current state of research on the design and construction of late Gothic vaults is principally based on the interpretation of sources, but rarely on surveys of existing vaults. In particular the idea for the criteria upon which the radii of the single ribs and arches were determined (so-called "principal arch"), is found to derive from sources dating from later periods when Gothic vaulting was no longer generally practised. In fact, this interpretation cannot be supported by geometric surveys on existing vaults: the plain contradiction to the actual geometric properties of some of the vaults studied so far have called for a critical revision of this interpretation. For investigating the design criteria and procedures starting from the built object, and also debating the methodological aspects of using the "building as source", a rewarding subject is the vault with curvilinear ribs in the "Hall of Arms" in the Albrechtsburg at Meissen (Germany), which was built by Jacob Heilmann in 1521. This is due to its ambitious design, high quality of execution and good state of preservation. A detailed survey of this structure is presented, discussing different aspects of the design, construction, and detailing, e.g.: Investigations on the geometrical concept of the vault by means of "reverse geometric engineering", on the background of the problem mentioned above. Further, the stone-cutting of the single members of the vault, which offers interesting aspects of standardization and its limits in nerves with double curvature: standardization in medieval constructions has been object of discussion, but not yet studied in the ambit of late Gothic vault construction. The question whether and how the vault surface was determined in the design, being the principle structural feature working as a shell structure; this is of particular interest as the relation between the rib system and the shell is complex and has consequences on the stone-cutting of the arches. The question how the design specifications for the single rib members could be derived from the general concept of the curves (clarified in the survey); the context to the graphic sources and technical prose related to late Gothic vault design and structural design. The aim is to understand the entire design process, the criteria of the decisions taken, their relation to the contemporary theory, and the communication process which took place for the creation of this extremely demanding structure.

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Wendland, David, Alonso María Aranda, and Alexander Kobe. "The Vault with Curvilinear Ribs in the "Hall of Arms" in the Albrechtsburg Meissen: Studies on the Concept, Design and Construction of a Complex Late Gothic Rib Vault." Technische Universität Dresden, 2014. https://tud.qucosa.de/id/qucosa%3A28705.

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The current state of research on the design and construction of late Gothic vaults is principally based on the interpretation of sources, but rarely on surveys of existing vaults. In particular the idea for the criteria upon which the radii of the single ribs and arches were determined (so-called "principal arch"), is found to derive from sources dating from later periods when Gothic vaulting was no longer generally practised. In fact, this interpretation cannot be supported by geometric surveys on existing vaults: the plain contradiction to the actual geometric properties of some of the vaults studied so far have called for a critical revision of this interpretation. For investigating the design criteria and procedures starting from the built object, and also debating the methodological aspects of using the "building as source", a rewarding subject is the vault with curvilinear ribs in the "Hall of Arms" in the Albrechtsburg at Meissen (Germany), which was built by Jacob Heilmann in 1521. This is due to its ambitious design, high quality of execution and good state of preservation. A detailed survey of this structure is presented, discussing different aspects of the design, construction, and detailing, e.g.: Investigations on the geometrical concept of the vault by means of "reverse geometric engineering", on the background of the problem mentioned above. Further, the stone-cutting of the single members of the vault, which offers interesting aspects of standardization and its limits in nerves with double curvature: standardization in medieval constructions has been object of discussion, but not yet studied in the ambit of late Gothic vault construction. The question whether and how the vault surface was determined in the design, being the principle structural feature working as a shell structure; this is of particular interest as the relation between the rib system and the shell is complex and has consequences on the stone-cutting of the arches. The question how the design specifications for the single rib members could be derived from the general concept of the curves (clarified in the survey); the context to the graphic sources and technical prose related to late Gothic vault design and structural design. The aim is to understand the entire design process, the criteria of the decisions taken, their relation to the contemporary theory, and the communication process which took place for the creation of this extremely demanding structure.

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Nakládal, Tomáš. "Tankovací a osvětlovací věž pro závody GT automobilů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227932.

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The aim of this diploma work is an engineering design of technical set of equipment for endurance racing according with FIA regulations. Equipment of pit box should assure: refueling, lighting place of pit box and distribution of compressed air. CAD model of box equipment is designed in SolidWorks 2007 software. Construction is verified by the help of finite element method (FEM) in ANSYS WORKBENCH software. Main emphasis is attached to functionality, variability and low prize of this solution.

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SILVA, Ivaldo Jos? da. "Educa??o ambiental e o tratamento de ?gua: uso do sistema de tratamento de ?gua baseado em ultravioleta em C?mpus do Instituto Federal do Maranh?o e sua rela??o com a constru??o de conhecimentos." Universidade Federal Rural do Rio de Janeiro, 2013. https://tede.ufrrj.br/jspui/handle/jspui/2535.

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Research in Environmental Education Criticizes aims to construct and reflective critique of knowledge allowing individuals greater contextualisation-environmental relations and consequent changes, in attitudes towards collective transformation of reality. The municipality of Z? Doca, regional pole of Turi, located east of the State of Maranh?o, in the Northeast region near the border with the State of Par?, is responsibility to articulate educational actions, political and economic, social and environmental development of over 17 other municipalities in the region. It was found that municipalities the environmental sanitation and water treatment is performed unsatisfactorily and precarious, signaling the need for sustained research-driven actions on the principles of education Wake up in the population capable environmental more questioning and intervention in the local reality. This research aimed to instigate critical knowledge construction to allow greater local perception of reality, associated with insertion technique feasibility research, Community research, alternative technology of water treatment based on ultraviolet radiation-UV Tube. The Methodological development used by this social research was action research procedures where awareness, dynamic cooking workshops, adaptation and installation of UV Tube, meetings and other educational practices addressed the theme of water treatment, social issues, environment and health, among other correlated in a participative manner, reflective and harmonic among respondents and researchers. The search area was chosen as the community of rural settlement good hope, located in Z? Doca, where were installed and evaluated 05 (five) UV Tube units. Data collection took place 64 (sixty-four) interviews and questionnaires applied before the dynamics of awareness and at the end of the whole educational process in order to identify improvement in the perception of the community in relation to the subject dealt with and the local reality, and consequential changes in attitudes. The treatment of data collected in the questionnaires presented variables that were tested with the non-parametric test of Chi-square and other calculated averages of answers with their respective standard deviations and their minimum and maximum values. The results indicated favourable conditions for the adaptation and insertion of the UV tube technology showing economic viability and operational compared to similar projects successfully installed in other countries, especially the acceptance of the proposal and the ease of access to the materials needed to manufacture of UV Tube. As the analysis of educational activities related to the thematic discussion addressed significant responses were expansions and modifications in order to understand the local reality criticizes pointing, including changes to posture that assisted the search for better quality of life for the community. It is concluded that the implementation of concrete action of insertion of the UV Tube use, Dialogic and critical process of construction of knowledge based on the intrinsic relationship between action and reflection associated with the permissive criticizes of knowledge built by researched and researchers was the recipe to achieve the objectives of the survey.
A pesquisa em Educa??o Ambiental Cr?tica visa ? constru??o reflexiva e cr?tica de conhecimentos, permitindo aos indiv?duos maior contextualiza??o das rela??es socioambientais e consequentes mudan?as de atitudes voltadas para transforma??o coletiva da realidade. O munic?pio de Z? Doca, p?lo regional do Alto Turi, localizado a leste do Estado do Maranh?o, pr?ximo a divisa com o Estado do Par? ? respons?vel em articular a??es educacionais, socioambientais, pol?ticas e econ?micas para o desenvolvimento de mais 17 outros munic?pios da regi?o. Verificou-se que nestes munic?pios o saneamento ambiental e, principalmente, o tratamento de ?gua, s?o realizados de forma insuficiente e prec?ria, sinalizando a necessidade de a??es orientadas por pesquisas sustentadas nos princ?pios de uma Educa??o Ambiental capaz de despertar na popula??o maior problematiza??o e interven??o na realidade local. Esta pesquisa objetivou instigar a constru??o de conhecimentos cr?ticos aptos a permitirem maior percep??o da realidade local associada ? investiga??o da viabilidade t?cnica de inser??o, junto ? comunidade pesquisada, de tecnologia alternativa de tratamento de ?gua baseado em radia??o ultravioleta ? Tubo UV. Para o desenvolvimento metodol?gico esta pesquisa social utilizou-se de procedimentos da pesquisa-a??o em que din?micas de sensibiliza??o, oficinas de confec??o, adapta??o e instala??o do Tubo UV, reuni?es e outras pr?ticas educacionais abordaram a tem?tica do tratamento de ?gua, as quest?es sociais, ambientais e de sa?de, entre outras correlacionadas de forma participativa, reflexiva e harm?nica entre pesquisados e pesquisadores. Como ?rea de pesquisa foi escolhida a comunidade do assentamento rural Boa Esperan?a - ABE, localizada em Z? Doca onde foram instalados e avaliados 05 (cinco) unidades do Tubo UV. Para coleta de dados foram realizadas 64 (sessenta e quatro) entrevistas e aplicados question?rios antes das din?micas de sensibiliza??o e ao final de todo o processo educativo, com objetivo de identificar melhoria na percep??o da comunidade em rela??o ? tem?tica abordada e a realidade local, al?m de consequentes mudan?as de atitudes. O tratamento dos dados coletados nos question?rios apresentou vari?veis que foram analisadas com o teste n?o param?trico do Qui-Quadrado e outras, calculadas as m?dias de respostas com seus respectivos desvios padr?es e seus valores m?nimos e m?ximos. Os resultados indicaram condi??es favor?veis ? adapta??o e inser??o da tecnologia do Tubo UV apresentando viabilidade econ?mica e operacional comparada a projetos id?nticos instalados com sucesso em outros pa?ses, destacando-se a aceita??o da proposta e a facilidade de acesso aos materiais necess?rios a confec??o do Tubo UV. Quanto a an?lise das a??es educativas relacionadas a discuss?o da tem?tica abordada registraram-se significativas respostas de amplia??es e modifica??o na forma cr?tica de perceber a realidade local apontando, inclusive, mudan?as de postura que auxiliaram a busca de melhor qualidade de vida para comunidade. Conclui-se que a realiza??o da a??o concreta da inser??o do uso do Tubo UV, em processo dial?gico e cr?tico de constru??o de conhecimento pautado na rela??o intr?nseca entre a??o e reflex?o associada ? permissiva cr?tica dos saberes constru?dos por pesquisados e pesquisadores foi a receita para alcan?ar os objetivos da pesquisa.

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Petitto, R?gia Mara. "An?lise da viabilidade de aplica??o de res?duos da constru??o civil da Regi?o Metropolitana de Campinas em argamassas de uso geral por m?todo multicrit?rios." Pontif?cia Universidade Cat?lica de Campinas, 2017. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/973.

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The objective of this work was to characterize the recycled aggregates generated in the metropolitan region of Campinas and to test its application in the production of mortars for general use. From a qualitative approach, with an exploratory objective, the surveys of the current legislation and legal requirements imposed to solid waste management and the panorama of this management in the metropolitan region of Campinas were carried out. The six recycling plants for the disposal of construction waste (RCC) generated in the implanted municipalities were identified and, based on the data collected, a map with the geographic location of these plants was elaborated. After the sample collection, with a quantitative approach of applied nature and exploratory objective, analyzes of the physical characteristics were made (grain size composition, 75 ?m sieve material, water absorption, clay cladding content and friable materials, Specific mass and organic impurity) and chemical (soluble salts and organic matter content by fire loss) of these materials. All the analyzed aggregates presented satisfactory results in the granulometric composition and water absorption tests. Regarding the content of fine material (less than 75 ?m), clay content and friable materials and organic impurities, few samples could be accepted for use recommended by the Brazilian Association of Technical Standards (ABNT). The analysis of the soluble salts content would also make it impossible to accept the aggregate of some suppliers. With the replacement of natural aggregate by the recycled aggregates, mortars with a 1: 3 dash (cement: aggregate) were prepared, and 20 and 40% of the natural aggregate were replaced. The characteristics of the mortars in the fresh state (water retention, incorporated air content, mass density) and hardened (water absorption by capillarity, capillary coefficient, compressive strength, flexural tensile strength and apparent specific mass in the Hardened state). From the results obtained, the analytical Hierarchy Process (AHP) methodology showed the content of incorporation of the recycled aggregate in the production of general purpose mortars composed of cement and sand. For the application of this method, weights were assigned to punctuated criteria related to the physical and mechanical performance of mortars and environmental criteria related to the exhaustion of natural resources and transport distance. The best result was found in mortar with a 20% substitute content of mixed recycled aggregate by municipal unit from Campinas, but it is not possible to observe a tendency to obtain better results in mortars with lower substitution content, nor exclusively by mortars with mixed recycled aggregates.
O presente trabalho teve por objetivo caracterizar os agregados reciclados gerados na regi?o metropolitana de Campinas e testar sua aplica??o na produ??o de argamassas para uso geral. A partir de uma abordagem qualitativa, com objetivo explorat?rio, foram realizados os levantamentos da legisla??o vigente e exig?ncias legais impostas ? gest?o dos res?duos s?lidos e do panorama desta gest?o na regi?o metropolitana de Campinas. As seis usinas recicladoras para destina??o dos res?duos de constru??o civil (RCC) gerados nos munic?pios implantadas foram identificadas e, a partir dos dados coletados, elaborou-se um mapa com a localiza??o geogr?fica destas usinas. Ap?s a coleta de amostras, com abordagem quantitativa de natureza aplicada e objetivo explorat?rio, foram realizadas an?lises das caracter?sticas f?sicas (composi??o granulom?trica, teor de material passante na peneira de 75 ?m, absor??o de ?gua, teor de torr?es de argila e materiais fri?veis, massa espec?fica e impureza org?nica) e qu?micas (sais sol?veis e teor de mat?ria org?nica por perda ao fogo) destes materiais. Todos os agregados analisados apresentaram resultados satisfat?rios nos ensaios de composi??o granulom?trica e absor??o de ?gua. J? quanto ao teor de material fino (menor que 75 ?m), teor de torr?es de argila e materiais fri?veis e impurezas org?nicas, foram poucas as amostras que poderiam ser aceitas para o emprego recomendado pela Associa??o Brasileira de Normas T?cnicas (ABNT). A an?lise do teor de sais sol?veis tamb?m inviabilizaria a aceita??o do agregado de alguns fornecedores. Com a substitui??o de agregado natural pelos agregados reciclados foram preparadas argamassas com tra?o de 1:3 (cimento:agregado), e substitui??o de 20 e 40% do agregado natural. Foram determinadas as caracter?sticas das argamassas no estado fresco (reten??o de ?gua, teor de ar incorporado, densidade de massa) e endurecido (absor??o de ?gua por capilaridade, coeficiente de capilaridade, resist?ncia ? compress?o, resist?ncia ? tra??o na flex?o e massa especifica aparente no estado endurecido). A partir dos resultados obtidos verificou-se, por aplica??o do m?todo de avalia??o multicrit?rios, com a metodologia Analytic Hierarchy Process (AHP), o teor de incorpora??o do agregado reciclado na produ??o de argamassas de uso geral compostas por cimento e areia. Para a aplica??o deste m?todo foram atribu?dos pesos a crit?rios pontuados ligados ao desempenho f?sico e mec?nico das argamassas e crit?rios ambientais ligados ao esgotamento dos recursos naturais e dist?ncia de transporte. O melhor resultado foi encontrado na argamassa com teor de substitui??o de 20% de agregado reciclado misto da unidade municipal de Campinas, mas n?o ? poss?vel observar tend?ncia de obter melhores resultados em argamassas com menor teor de substitui??o, nem t?o pouco exclusivamente por argamassas com agregados reciclados mistos.

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Kozla, Dávid. "Stavebně technologický projekt pro Mezinárodní centrum klinického výzkumu Fakultní nemocnice u sv. Anny v Brně." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409970.

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This diploma thesis solves the construction technology project of the International Clinical Research Center of the St. Anne’s University Hospital, Brno (ICRC), namely the first stage of the construction of the buildings "B1" and "C1". It tries to design an ideal technological process of construction with respect of local conditions. Technologically it focuses mainly on the issue of special foundation, namely protection of excavation pit with secant pile wall and pile foundation. There are processed technological regulations, time and financial plans, construction budget, control and test plan, plan of heavy equipment and safety or environmental requirements. Everything is supplemented by attachments and drawing documentation.

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Amorim, Francisco de Assis Ver?osa. "Uma inser??o de recursos institucionais na disciplina de constru??es rurais: o uso de materiais alternativos dispon?veis na microrregi?o de Satuba nas constru??es de instala??es rurais." Universidade Federal Rural do Rio de Janeiro, 2010. https://tede.ufrrj.br/jspui/handle/jspui/2528.

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Within this study, we aimed the participation of students on thirth year of Agriculture Course in order to awaken, them and through them, the interest of the community surrounding Federal Agrotechnical School of Satuba/AL for the use of alternative materials, available at this micro-region, for construction of rural breeding of family subsistence, through alternative techniques of rustic construction, using " knowledge development " and "design methodology". Faced with this challenge, the work was organized in four stages. At first stage, there was the involvement of students through a questionnaire about the possibility of using alternative materials for rural construction, such as fibers, palm leaves, polypropylene fiber raffia bags, old tires, PET, clay, etc., followed by the presentation of examples of rustic buildings and facilities for housing animals, reported in the literature, on the Internet and orally among the inhabitants of Satuba micro-region. In the second stage, we seek "knowledge development? based on the construction of diverse animal facilities for family subsistence production, using alternative materials found in Satuba micro-region, together with the community. In the third period, we reviewed, cataloged, organized and worked out an institutional document, as an embryonic proposed model of rustic facilities for breeding, using techniques and alternative materials, developed at the collective research, in order to boost an entire productive circle, from the collection of these materials until the construction of rural facilities for animal production, thus occupying families in an alternative activity, environmentally adequated, without requiring large investments. On fourth stage, we sought to evaluate the change that the experience of rural buildings construction with alternative materials had on the students. It was concluded that the proposal is viable and can be incorporated into the community, with students help, as a process of knowledge elaboration.
No presente trabalho, buscou-se a participa??o de alunos dos terceiros anos do Curso de Agropecu?ria com o intuito de despertar, neles e por meio deles, o interesse da comunidade circunvizinha ? Escola Agrot?cnica Federal de Satuba/AL, para a utiliza??o dos materiais alternativos dispon?veis na sua microrregi?o, para constru??o de instala??es rurais de cria??es de animais de subsist?ncia familiar. Para isso se usou as t?cnicas alternativas r?sticas de constru??o civil, as quais foram ?desconstru?das? e ?reconstru?das? atrav?s da ?elabora??o do conhecimento? e da ?metodologia de projetos? com o intuito de adapt?-las as constru??es de instala??es de cria??es animais. Diante desse desafio, o trabalho foi organizado em quatro momentos. No primeiro momento, ocorreu o envolvimento dos alunos, por meio de um question?rio sobre a possibilidade de uso de materiais alternativos na constru??o rural, com fibras, folhas de palmeiras, sacos de fibra de r?fia e polipropileno, pneus velhos, embalagem PET, argila, etc. E, por conseguinte se apresentou exemplos de constru??es r?sticas para moradias humanas e instala??es zoot?cnicas, existentes na literatura, internet e tamb?m as difundido popularmente entre os moradores da microrregi?o de Satuba. No segundo momento, se buscou atrav?s da ?elabora??o do conhecimento? construir as instala??es animais mais utilizadas na circunvizinhan?a na produ??o familiar de subsist?ncia, utilizandose dos materiais alternativos dispon?veis na microrregi?o de Satuba, e do saber popular. No terceiro momento, levantou-se, organizou-se e elaborou-se um documento para utiliza??o institucional, com t?cnicas de instala??es r?sticas tradicionalmente consolidadas, para assim, com a ?constru??o do conhecimento? despertasse nos alunos, poss?veis desenvolvimentos de novas id?ias para as constru??es de instala??es r?sticas para cria??o de animais. Bem assim motivar todo um c?rculo produtivo, desde a coleta desses materiais at? a constru??o de instala??es rurais para produ??o animal, ocupando as fam?lias em uma atividade alternativa, ecologicamente correta, sem exigir grandes investimentos. No quarto momento, buscou-se avaliar com a apresenta??o do mesmo question?rio apresentado no primeiro momento a modifica??o que a viv?ncia com a constru??o por materiais alternativos exerceu sobre os alunos. Concluiu-se que a proposta ? vi?vel e pode ser incorporada pela comunidade, com o aux?lio dos alunos, num processo de elabora??o do conhecimento com aplicabilidade das t?cnicas de constru??o com materiais alternativos, nas instala??es de cria??es animais.

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Blažek, David. "Stavebně technologického řešení Vzdělávacího komplexu v Brně." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225564.

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This master’s thesis deals with construction of the gross building of new building of learning complex FEKT VUT in Brno. It contains the design of earthworks, underground setting piles, monolithic structures and isolation of the building for further construction. Construction and technological project includes technical report, time and financial plan of construction, study of the implementation of major technological stages of site preparation, budget of facilities, technological regulation to solved stages, inspection and test plan of monolithic structures, health and safety plan and energy label of objects.

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Fernstål, Lotta. "Delar av en grav och glimtar av en tid : Om yngre romersk järnålder, Tuna i Badelunda i Västmanland och personen i grav X." Doctoral thesis, Stockholms universitet, Institutionen för arkeologi och antikens kultur, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-277.

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Grave X was found in 1952 during construction work in Tuna in Badelunda parish, in the province of Västmanland. Objects from this 3rd Century grave were dispersed and the stone grave covering and cist-like wooden burial chamber were cut almost in half as a result of the construction work that unearthed it. The purpose of this dissertation is to create a better understanding of Tuna in Badelunda and to place Grave X and the person buried there in context. Due to my interest in Grave X and the person in this grave, the scope of the study is limited to Tuna during the Late Roman Iron Age. What kind of place may Tuna in Badelunda have been during that time? Which kinds of knowledge may the person in Grave X have possessed and what roles may this person have had in local society? How may this person have acted in Tuna in Badelunda in particular? Why was this person buried in the specific type of structure that was Grave X? To answer these questions, ancient monuments and phenomena in the Tuna area, objects from the grave and construction details of the grave are discussed. Specifically, I examine the name Tuna, stone enclosures, hillforts of Bejby borg-character and travel routes, beads, golden rings in the shape of snakes, vessels and serving utensils, and the stone grave covering and cist-like chamber. Since Grave X was partly ruined when discovered, comparisons are made to about 20 similar graves from other parts of Scandinavia in order to get an idea of what may have been lost from Grave X. A performative-constructive gender perspective is of importance in this dissertation, as well as the concept of creolization. The kinds of knowledge and the societal roles the person in Grave X may have had can be summarized in five categories or contexts of action: production within the (social-political) economy of the farm, ritual performances, physical communication, textile production, and oral performances with the telling of stories and relating of memories. Possible personal strategies in relation to the activities the person in question was involved in are seen as important. One way this dissertation takes up this subject is through the discussion of the role the person may have had in greetings and farewells in the yard of the farm (Sw. tun, gårdsplan). Greetings and farewells were probably of importance, and Tuna is discussed as a crossroads. This means that although a local perspective is advocated in this dissertation, Tuna may not be seen as an isolated community, but rather as a small place that to a great extent partook in the larger world. This can also be seen in Grave X; when the person in this grave was buried, the living made choices that both expressed local traditions and made reference to far-away places. In contrast to the surrounding graves, the person in Grave X was not cremated. One of many possible reasons may have been a desire to emphasize the person’s personality and gender as well as roles in society.

Auktoriserad namnform i LIBRIS: Fernstål, Charlotte, 1974-

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Honzík, Roman. "Kampus MU Brno (zelená etapa) - stavebně technologický projekt." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227231.

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The subject of this thesis is the solution of building technology project for the construction of the main processing stages University Campus Bohunice (green stage). It is a building consisting of nine pavilions which are mutually connected by two corridors. Corridors simultaneously combine green building stage with blue previous stage. All buildings are partial basement and three floors. Exceptions are SO IV-309, which consisted of four storeys with casing of an elliptic cylinder with a flat roof in the middle of the roof sheathing. In my thesis I deal specifically this very building object, which I discussed in terms of time, financial, technological progress bored piles and building equipment. Other portions are designed to project the whole building.

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Všetečka, Jan. "Stavebně technologický projekt revitalizace těžní věže Brno." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227274.

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The task of this diploma’s thesis was processing construction-technology project to revitalization the mining towers because of its current worsened state and subsequent adjustments for cultural activities.

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Rundans, Valdis V. ""Tearing Apart the Bear" and British Military Involvement in the Construction of Modern Latvia: A History Untold." Thesis, 2014. http://hdl.handle.net/1828/5848.

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Despite significant evidence to the contrary in the Latvian language, especially the memoirs of General Peteris Radzins, Latvians, historians included, and others, have persisted in mythologizing the military events of 8 October to 11 November 1919 in Riga as some sort of national miracle. Since this Latvian army victory, first celebrated as Lacplesis Day on 11 November 1920, accounts of this battle have been unrepresented, poorly represented or misrepresented. For example, the 2007 historical film Rigas Sargi (The Defenders of Riga) uses the 1888 poem Lacplesis by Andrejs Pumpurs as a template to portray the Latvians successfully defeating the German-Russian force on their own without Allied military aid. Pumpurs' dream and revolutionary legacy has provided a well used script for Latvian nation building. However, the reality documented by Radzins in 1922 clearly gives most of the credit to the Allied Fleet which provided two significant series of well planned and well coordinated naval artillery barrages in support of Latvian infantry offensives which succeeded in driving their dual enemy out of Riga thereby ending Russian-German hegemony in the Latvian territory and making Latvian independence possible. How the poem, military event, and film are related in a problematic way with respect to Latvian/Russian relations is the subject of this thesis.
Graduate
mackie9@telusplanet.net

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Zhu, Xiao-Shen, and 朱孝深. "Construction schemes of the optimal fault-tolerant networks for rings and linear arrays." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/26139697003187347398.

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碩士
大葉大學
資訊工程研究所
90
An interconnection network connects the processors of the parallel computer. The ring and linear array networks are the most fundamental topologies for interconnection networks. They can be used to sorting and searching data in distributed systems. A ring network is also used as a connection structure for local area networks, for example Token Rings. Fault tolerance is also an important issue especially when the size of an interconnection network is large. In this thesis, we study the fault tolerance properties and construction schemes for ring and linear array networks with both nodes and links failures. In this thesis, we introduce the concepts of (node, edge) Hamiltonian-connectivity and strongly k-Hamiltonian graph. Furthermore, we present construction schemes for fault-tolerant Hamiltonian and Hamiltonian-connected networks. We will study a new concept, called strongly k-Hamiltonian graphs, for the fault tolerance of Hamiltonian graphs. We also present two construction schemes for strongly k-Hamiltonian graphs including (k + 2)-join and Cartesian product with K2. Applying these schemes, we can construct many new strongly k-Hamiltonian graphs.

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MULLER, HANS ALBERT. "RIGI: A MODEL FOR SOFTWARE SYSTEM CONSTRUCTION, INTEGRATION, AND EVOLUTION BASED ON MODULE INTERFACE SPECIFICATIONS." Thesis, 1986. http://hdl.handle.net/1911/16096.

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This thesis focuses on the structure and version information of large, integrated, evolving software systems. It concerns the definition, readability, understandability, comprehensibility, consistency, and completeness of system descriptions. The major contributions of this thesis are the ${\rm Rigi}\sp{1}$ model, Rigi editor, and the global interface analysis algorithms. A major focus of this research concerns the semantic network data model Rigi. It models the bricks and mortar of large, integrated, evolving software systems. The bricks range from the atomic objects of a module (i.e., definition, implementation, requirement, provision, variant and revision) to the composite objects of a system (i.e., subsystem, subsystem variant, subsystem revision, composition, and configuration). The mortar is an amalgam of dependencies (i.e., structure, compilation, semantic, and revision). The Rigi model is a graph model with a careful definition of the meaning and usage of the nodes and arcs. The Rigi editor deals with the integration of the Rigi model into a software development environment. It assists the designers, programmers, integrators, and maintainers in defining, exploring, understanding, and comprehending the structure of large, integrated, evolving software systems. The system descriptions as produced by the Rigi editor should run as a common thread through the life of a software project. The Rigi editor features the global interface analysis algorithms which analyze, predict, and limit the effects of an editing change in a basic interface of a software system on the entire system. The algorithms improve on the deficiencies of the traditional compilation rule found in strongly-typed, separately-compiled programming languages, which forces the recompilation of definition and implementation modules that are not at all affected by a change in a basic interface. The algorithms assume a software development environment which provides efficient access to the compilation dependencies and the module interfaces of the components being implemented. The algorithms operate on recursive compilation dependency graphs and perform in time O(n log n) where n is the size of the affected graph.

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Ficq, Bernard L. "Resonant forward-biased guard rings for suppression of substrate noise in mixed-mode CMOS circuits." Thesis, 1994. http://hdl.handle.net/1957/35243.

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Previous work at Stanford University has demonstrated that inductance in the substrate connection is the principal problem underlying the coupling of digital switching noise into analog circuits. The low impedance substrate can be treated as a single node over a local area. Switching in the digital circuits produces current transients in the substrate. These transients are subsequently amplified in the analog portions of the overall mixed-mode circuit. Various guard rings and other techniques, including the use of new logic circuit families, have been proposed to suppress this noise. This work demonstrates that by using the capacitance of a forward biased guard ring(s), the substrate noise at a specific frequency(ies) can be reduced by resonating the guard ring capacitance with the substrate lead inductance to provide a very low substrate-to-ground impedance. In this manner, noise at particular frequencies, which are problematic to the analog circuit, can be suppressed. Tuning can be accomplished by varying the current in the forward-biased guard ring diodes.
Graduation date: 1995

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48

Keil, Boris [Verfasser]. "A unified distributed DSP-based beam diagnostics and global feedback system for ramped electron storage rings : development, construction and applications / Boris Keil." 2003. http://d-nb.info/967778778/34.

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Zheng, Tao. "Stereoselective construction of cyclic ether rings via cyclic orthoesters and kinetic resolution of racemic alkenes by asymmetric dihydroxylation using peptide-based ligands." Diss., 2006.

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Baiazitov, Ramil Yashnurovich. "Tandem double intramolecular [4+2]/[3+2] cycloaddition of nitro olefins : part I construction of piperidine rings, part II construction of vicinal quaternary stereogenic centers, part III progress toward a total synthesis of daphnilactone B /." 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3269837.

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Thesis (Ph. D.)--University of Illinois at Urbana-Champaign, 2007.
Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 3788. Adviser: Scott E. Denmark. Includes bibliographical references (leaves 371-384). Available on microfilm from Pro Quest Information and Learning.

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