Recent advancements in silicon technology have paved the way for the development of integrated transceivers operating well inside the mm-wave frequency range (30 - 300 GHz). This band offers opportunities for new applications such as remote sensing, short range radar, active imaging and multi-Gb/s radios. This thesis presents new ideas at the circuit and system level for a variety of such applications, up to 145 GHz and in both state-of-the-art nanoscale CMOS and SiGe BiCMOS technologies. After reviewing the theory of operation behind linear and power amplifiers, a purely digital, scalable solution for power amplification that takes advantage of the significant ft/fmax improvement in pFETs as a result of strain engineering in nanoscale CMOS is presented. The proposed Class-D power amplifier, features a stacked, cascode CMOS inverter output stage, which facilitates high voltage operation while employing only thin-oxide devices in a 45 nm SOI CMOS process. Next, a single-chip, 70-80 GHz wireless transceiver for last-mile point-to-point links is described. The transceiver was fabricated in a 130 nm SiGe BiCMOS technology and can operate at data rates in excess of 18 Gbps. The high bitrate is accomplished by taking advantage of the ample bandwidth available at the W-band frequency range, as well as by employing a direct QPSK modulator, which eliminates the need for separate upconversion and power amplification. Lastly, the system and circuit level implementation of a mm-wave precision distance and velocity sensor at 122 and 145 GHz is presented. Both systems feature a heterodyne architecture to mitigate the receiver 1/f noise, as well as self-test and calibration capabilities along with simple packaging techniques to reduce the overall system cost.

Recent advancements in silicon technology have paved the way for the development of integrated transceivers operating well inside the mm-wave frequency range (30 - 300 GHz). This band offers opportunities for new applications such as remote sensing, short range radar, active imaging and multi-Gb/s radios. This thesis presents new ideas at the circuit and system level for a variety of such applications, up to 145 GHz and in both state-of-the-art nanoscale CMOS and SiGe BiCMOS technologies. After reviewing the theory of operation behind linear and power amplifiers, a purely digital, scalable solution for power amplification that takes advantage of the significant ft/fmax improvement in pFETs as a result of strain engineering in nanoscale CMOS is presented. The proposed Class-D power amplifier, features a stacked, cascode CMOS inverter output stage, which facilitates high voltage operation while employing only thin-oxide devices in a 45 nm SOI CMOS process. Next, a single-chip, 70-80 GHz wireless transceiver for last-mile point-to-point links is described. The transceiver was fabricated in a 130 nm SiGe BiCMOS technology and can operate at data rates in excess of 18 Gbps. The high bitrate is accomplished by taking advantage of the ample bandwidth available at the W-band frequency range, as well as by employing a direct QPSK modulator, which eliminates the need for separate upconversion and power amplification. Lastly, the system and circuit level implementation of a mm-wave precision distance and velocity sensor at 122 and 145 GHz is presented. Both systems feature a heterodyne architecture to mitigate the receiver 1/f noise, as well as self-test and calibration capabilities along with simple packaging techniques to reduce the overall system cost.

Les Andes de Mérida (Venezuela) est caractérisé par la présence de morphologie glaciaire bien préservée entre 2400-4978 m. Les études de ces morphologies glaciares font la contribution pour mieux comprendre et reconstruire la Dernière Glaciation aux Andes Vénézuéliennes. La reconstruction de la Dernière Glaciation (connue dans la région comme Glaciation Mérida) était limitée par la disponibilité de chronologie glaciaire. Cette thèse fait sa contribution à la reconstruction de la Dernière Glaciation et à la connaissance du paléoclimat depuis le Pléistocène Superieur. La méthodologie a involucré l´analyse géomorphologique et l´étude géochronologique. La morphologie glaciaire a été datée avec la technique de nucléides cosmogéniques produits in-situ (10Be). Cette technique est appropriée pour dater les matériels riches en quartz et la période d´intérêt. Les inférences des conditions paleoclimatiques ont été faites sur la base des analyses de la paléo ELA.Des différentes dynamiques glaciares ont été identifiées aux Andes centrales de Mérida. Dans les vallées de Mucubají et Mucuchache, la dynamique a été caractérisée par plusieurs étapes de avancé-arrêt des glaciaires dans un recul général de la glace. Dans les vallées de Gavidia et Mifafí, la disparition des glaciares a été très rapide avec la vitesse de recul plus haute (entre 4-7 km/ky). Divers caractéristiques morpho métriques comme la pente du fond de la vallée, la topographie de la zone d´accumulation (cirques glaciares avec les murs très incliné), des surfaces de la zone d´accumulation et son orientation ont aussi contrôlé les différents dynamiques glaciares.Les avancées des glaciares ont été identifiées entre 2500-4200 m. Les avancées glaciares pendant le MIS 3 ont été reconnues à Sierra Nevada. Ces avancées ont été liées aux hautes précipitations dans le nord de l´Amérique de Sud produites par l´activité de la Zone de Convergence Intertropical. Ces avancées ont été aussi reliées aux conditions plus chaudes et humides dans l´Hémisphère Nord (aussi ces conditions ont été identifiées aux Andes vénézuéliennes et sont connues comme l´Interstadío El Pedregal). Les avancées glaciares pendant le Dernière Maximum Glaciares ont été enregistrées en Sierra Nevada á Mucubají et Las Tapias entre 3100-3600 m. Principalement, les avancées glaciares MIS 2 sont arrivées pendant l´Oldest Dryas-El Caballo Estadío à 17 ka. Ces avancées glaciares ont été reliées aux températures froides dans l´Hémisphère Nord et les températures plus froides enregistrées dans les carottes de glaciares tropicaux.Mots clésDatation par cosmogéniques produits in-situ, morphologie glaciaire, Pléistocène, Dernière Glaciation, LGM, paléo ELA. / The central Mérida Andes (Venezuela) landscape is characterized by the presence of well-preserved glacial landforms located between 2400 and 4978 m a.s.l. Geomorphological studies of these glacial landforms significantly contribute to the Venezuelan Andes glaciations reconstructions. However, Last Glaciation (locally called Mérida Glaciation) was poorly reconstructed because of limited chronological data. This dissertation attempts to contribute to the Last Glaciation reconstruction and paleoclimate knowledge since the late Pleistocene. Accordance this necessity, the methodology involved geomorphological analysis and geochronological study. Glacial landforms were dated based on the Terrestrial Cosmogenic Nuclide dating (10Be). This method is suitable for date quartz-rich materials and for the period of interest. To deduce paleoclimate conditions an analysis based on paleo ELA was developed.In the central Mérida Andes different Late Pleistocene glacier dynamics were identified. In the Mucubají and the Mucuchache valleys, successive stages of glacier stop-advance were identified during an overall glacier withdrawal. In the Gavidia and Mifafí valleys, glacier withdrawal was rapid with the highest retreat rates (between 4-7 km/ky). Morphometric features as glaciers bottom valley slopes, accumulation zone topography (glaciers cirques with steep walls), areas and orientation controlled different glaciers dynamics.Glacier advances were evidenced between 2500-4200 m. MIS 3 glaciers advances has been recognized in the Sierra Nevada. These were related to the highest runoff in the north of South America produced by the Intertropical Convergence Zone (ITCZ) and the local warm and wet climate conditions (locally named El Pedregal Interstadial). LGM glacier advances were recorded in Sierra Nevada in the Mucubají and Las Tapias between 3100-3600 m. MIS 2 Glaciers advances mainly occurred during the Oldest Dryas- El Caballo Stadial at around 17 ka. These glaciers advances correlate to the cold temperatures in the North Hemisphere and the coldest temperatures recorded in tropical ice cores.KeywordsTerrestrial cosmogenic nuclides dating, TCN, cosmogenic dating, glacial landforms, Andes Mérida, Venezuela. Pleistocene, Last Glaciation, LGM, paleo ELA, tropic paleoclimate.

Submitted by Oliveira Santos Dilzaná (dilznana@yahoo.com.br) on 2013-11-05T18:03:02Z No. of bitstreams: 1 Dissertação-Flaviane Nascimento.pdf: 3522447 bytes, checksum: 38d5bfba666d9eb7acd72910912964ae (MD5) / Approved for entry into archive by Ana Portela (anapoli@ufba.br) on 2013-11-18T17:10:01Z (GMT) No. of bitstreams: 1 Dissertação-Flaviane Nascimento.pdf: 3522447 bytes, checksum: 38d5bfba666d9eb7acd72910912964ae (MD5) / Made available in DSpace on 2013-11-18T17:10:04Z (GMT). No. of bitstreams: 1 Dissertação-Flaviane Nascimento.pdf: 3522447 bytes, checksum: 38d5bfba666d9eb7acd72910912964ae (MD5) / CAPES / Este estudo tem como objetivo analisar projetos e experiências de liberdade na região de Feira de Santana das últimas décadas do escravismo. A questão que persigo nesta dissertação é quais expectativas e experiências de liberdade foram possíveis entre os anos de 1850 e 1888 por aqueles lados da Bahia. Analiso em que medida as formas de outorga da carta de alforria e o exercício da liberdade estavam firmemente imbricados no período. Trata-se de um estudo que avalia os significados e usos da carta de alforria dentro de uma determinada gramática da libertação e do domínio a partir de uma coleção documental ainda inédita. Ou seja, como as circunstâncias da manumissão, sua política e prática incidiram sobre experiências de liberdade vivenciadas e compartilhadas pelos egressos do cativeiro, notadamente nos anos que se seguiram às reformas do escravismo no Brasil. Para tanto foi necessário entender como os diferentes sujeitos envolvidos – libertandos, testemunhas, juízes e senhores - definiam o estado ou a condição de liberdade daqueles sujeitos em ações cíveis de liberdade levadas às barras do tribunal. Pretendi uma análise dos significados do viver por si, grifados na documentação cartorial e judiciária.This study aims to analyze projects and experiences of freedom in the area of Feira de Santana in final decades of slavery. The question that I chase in this dissertation is what expectations and experiences of freedom were possible between the years of 1850 and 1888 in those parts of Bahia. I analyze the extent to which the shapes of the grant of letter of manumission and the exercise of freedom were tightly interwoven in the period. This is a study that assesses the meanings and uses of the letter of manumission within a particular grammar of liberation and domination from a collection of documents still unpublished. That is, as the circumstances of manumission, its policy and practice focused on experiences of freedom experienced and shared by freedmen, especially in the years following the reforms of slavery in Brazil. Therefore it was necessary to understand how the different subjects involved - libertandos, witnesses, judges and slaveholders - defined the state or condition of freedom from those subject to civil lawsuits brought freedom to the bars of the court. Here I analyze the meanings of live by themselves, written in judicial and notarial documents.

The use of iceberg-keel ploughmarks as proxy indicators of past and present iceberg morphology, keel depth and drift direction has seldom been approached in the southern hemisphere. Using high-resolution multi-beam swath bathymetry of the mid-shelf Pine Island Trough and outermost Weddell Sea shelf regions of Antarctica, detailed analysis of >13,000 iceberg-keel ploughmarks was undertaken. By considering the draft of icebergs calved from Antarctica today, calculated from detailed satellite altimetric datasets by this work, almost all observed ploughmarks were interpreted to be relict features. In Pine Island Trough, ploughmark planform parameters and cross-sections imply calving of a large number of non-tabular icebergs with v-shaped keels from the palaeo-Pine Island-Thwaites ice stream. Geological evidence of ploughmark form and modern water depth distribution indicates calving-margin thicknesses (949 m) and subaerial ice cliff elevations (102 m) equivalent to the theoretical threshold predicted to trigger ice-cliff structural collapse and calving by marine ice-cliff instability (MICI) processes. Thus, ploughmarks provide the first observational evidence of rapid retreat of the palaeo-Pine Island-Thwaites ice stream, driven by MICI processes commencing ~12.3 cal ka BP. On the Weddell Sea shelf, ploughmark morphologies imply considerable variation in palaeo-iceberg shape and size, most likely reflecting calving from multiple source margins. In turn, an absence of grounded ice on the Weddell Sea shelf and a palaeo-oceanographic regime comparable to today are implied at the time of formation. Analysis of a 3D seismic cube of the Sea Lion Field area of the North Falkland Basin reveals iceberg-keel ploughmarks incised into the modern- and palaeo-seafloor, formed by icebergs of varying shape and size that most-likely calved from the Antarctic Ice Sheet during three past glacial periods (estimated ages ~18 - 26.5 ka BP, ~246 ka BP, ~9.8 Ma BP). Despite illustrating the possibility of iceberg drift into the North Falkland Basin today, the relict ploughmark age implies little risk to any seafloor structures in the area, which might be required for hydrocarbon production. By these analyses, the significance of iceberg-keel ploughmarks as indicators of palaeo-glaciology and palaeo-oceanography at the time of formation is emphasised.

Submitted by Patrícia Ribeiro (patriciaribeirorj@gmail.com) on 2016-08-29T21:53:13Z No. of bitstreams: 1 dissertacao_UH_tribuna_do_governo_e_dos_trabalhadores_patricia_padovani_aprovado.pdf: 4326036 bytes, checksum: 23edd997f72904a3b05116591a55120a (MD5) / Approved for entry into archive by Rafael Aguiar (rafael.aguiar@fgv.br) on 2016-09-21T14:15:58Z (GMT) No. of bitstreams: 1 dissertacao_UH_tribuna_do_governo_e_dos_trabalhadores_patricia_padovani_aprovado.pdf: 4326036 bytes, checksum: 23edd997f72904a3b05116591a55120a (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2016-09-23T12:25:35Z (GMT) No. of bitstreams: 1 dissertacao_UH_tribuna_do_governo_e_dos_trabalhadores_patricia_padovani_aprovado.pdf: 4326036 bytes, checksum: 23edd997f72904a3b05116591a55120a (MD5) / Made available in DSpace on 2016-09-23T12:25:53Z (GMT). No. of bitstreams: 1 dissertacao_UH_tribuna_do_governo_e_dos_trabalhadores_patricia_padovani_aprovado.pdf: 4326036 bytes, checksum: 23edd997f72904a3b05116591a55120a (MD5) Previous issue date: 2016-08-24 / This research deals with the intersection between the interests of the government and the interests of the working class in the pages of the Last Hour. Created to defend and spread the Getulio Vargas policy and respond to criticism of other media outlets, the newspaper also had as main objective to represent the interests of ordinary people, especially the workers. The chronological cut for this analysis was the second government of Vargas, located 1950-1954 and timeframe of this study is 1951 appearance of the year of the Last Hour. The paper identifies how the labor movement has been portrayed in this paper, through the analysis of news coverage in key moments of representation of political ideology during the second government of Vargas: the celebrations by then the president’s birthday and Labor Day and João Goulart management in front of the Ministry of Labor, Industry and Commerce. The research also analyzes the coverage of two major strikes that happened in the period: the strike of 300,000 and Greve Mariners, both in 1953 and the spaces reserved for the claims of the workers in the pages of newspapers: the column 'Tell the people in UH 'and the realization of simulated popular courts against the economy of the people. / A presente pesquisa trata sobre o cruzamento entre os interesses do governo e os interesses da classe trabalhadora nas páginas da Última Hora. Criado para defender e difundir a política de Getúlio Vargas e responder às críticas dos demais veículos de imprensa, o jornal também tinha como objetivo principal representar os interesses dos setores populares, principalmente, dos trabalhadores. O recorte cronológico para esta análise foi o segundo governo de Vargas, situado de 1950 a 1954 e marco temporal deste estudo é 1951, ano de surgimento da Última Hora. O trabalho identifica de que forma o trabalhismo esteve retratado neste jornal, por meio da análise da cobertura jornalística em momentos-chave da representação desta ideologia política durante o segundo governo de Vargas: as comemorações pelo aniversário do então Presidente e pelo Dia do Trabalho e a gestão de João Goulart à frente do Ministério do Trabalho, Indústria e Comércio. A pesquisa analisa também a cobertura das duas grandes greves que aconteceram no período: a Greve dos 300 mil e a Greve dos Marítimos, ambas em 1953 e os espaços destinados para as reclamações dos trabalhadores nas páginas dos jornais: a coluna 'Fala o Povo na UH' e a realização dos simulados dos tribunais populares contra a economia do povo.

O processo de projeto tem importante papel na geração de valor, pois define o produto de forma que este atenda às necessidades do cliente. No entanto, o planejamento e controle deste processo na indústria da construção são, em geral, informais e ineficazes. Estes problemas tendem a ser mais graves em empreendimentos rápidos e complexos, quando envolvem sistemas pré-fabricados, normalmente caracterizados como sistemas do tipo engineer-to-order (ETO). Visando a aprimorar o processo de projeto, muitas empresas tem implementado conceitos e princípios da produção enxuta, podendo ser destacado o uso do Sistema Last Planner (SLP), que contribui para proteger a produção da variabilidade do processo, assim como para eliminá-la. O presente estudo tem como objetivo propor um modelo de planejamento e controle de projetos em empresas que projetam, fabricam e montam sistemas pré-fabricados, com características de sistema de produção do tipo ETO. Foi realizado um estudo empírico no setor de projetos de empresa de sistemas construtivos metálicos, com sede na Região Sul do Brasil. Inicialmente, o SLP foi implementado em duas equipes de projeto, sendo refinado e adaptado ao contexto da empresa. Depois, o SLP refinado foi implementado em outras quatro equipes. Como principais contribuições destacam-se o papel do modelo proposto no aumento da transparência de processos e na melhoria da confiabilidade deste processo, possibilitando o planejamento integrado entre as equipes de projeto. O modelo pode ser aplicado a sistemas pré-fabricados do tipo ETO, não somente no contexto de sistemas construtivos metálicos, mas em equipes de projetos que desenvolvem múltiplos projetos simultaneamente. / The design process plays an important role in value generation, since it defines the products that must meet customer needs. However, design planning and control in the construction industry are often informal and ineffective. This problem tends to bring serious consequences, especially in fast and complex projects that involve prefabricated building systems, normally defined as engineer-to-order (ETO) environments. In order to improve the design process, several companies have implemented lean production concepts and principles, and especially the Last Planner System (LPS) for production control, which shields production from upstream variability as well as contributes for reducing it. The aim of this study is to propose a model for planning and controlling the design process in companies that design, manufacture and assemble prefabricated ETO building systems. An empirical study was carried out is the design department of a steel fabricator based in Southern Brazil. Initially, LPS was implemented in two design teams, being refined and adapted to the context of the company. Then, the existing LPS was implemented in four other design teams. The main contributions of this investigation is the role of the proposed model in increasing process transparency and improving the reliability of the design process, making it possible to produce an integrated plan for the whole design department. This model is not limited to steel fabricators, but is applicable to any ETO prefabricated building systems, in which design teams carry out multiple design projects simultaneously.

Este trabalho objetiva fornecer subsídios para uma maior compreensão dos elementos estruturais da Suíte para Órgão do Oratório “Sete Palavras de Cristo na Cruz”, opus 257 (1991) do compositor brasileiro Amaral Vieira e sua relação com o Oratório, do mesmo nome, opus 255a, através da análise relacionada com o texto e contexto do Oratório. A metodologia consiste no levantamento de informações a cerca da obra, questionário destinado ao compositor sobre o Oratório e Suíte para Órgão, identificação de aspectos retóricos e análise musical da obra observando a relação texto/música. Este trabalho poderá contribuir para uma melhor compreensão da Suíte para Órgão de Amaral Vieira através do aprofundamento de seu conteúdo musical aqui apresentado. / This study investigates the context and relationship of the Suite for Organ from the Oratory “The Seven Last Words of Christ on the Cross”, opus 257 (1991) and the Oratory itself (opus 255a), both by the Brazilian composer Amaral Vieira, for a better understanding of its structural elements. The methodology includes the context of both works, a questionnaire directed to the composer, analysis of the Suite, and identification of rhetorical aspects as they pertain to the Oratory. This work may contribute to a better understanding of the Suite for Organ by Amaral Vieira through the musical content presented here.

O presente trabalho adota, como base teórica, uma perspectiva desenvolvida a partir do exame de certas ideias presentes na obra ficcional de Enrique Vila-Matas apresentadas em seus romances Bartleby e companhia (a literatura do Não, pulsão negativa da literatura contemporânea, desistência e mutismo literários, renúncia à escrita) e O mal de Montano (doença literária, doente de literatura, literatose) e na ensaísta de Ricardo Piglia, em O último leitor (último leitor, o leitor viciado, que não consegue deixar de ler, leitor para o qual a leitura não é apenas uma prática, mas uma forma de vida; o leitor como personificação da literatura). A partir dessas noções, a presente Dissertação especula sobre as relações entre a escrita de Machado de Assis, o universo de Franz Kafka e a obra de Murilo Rubião. Adotou-se como metodologia a leitura comparativa desses autores, com destaque para os contos de Murilo Rubião, e de alguns dos escritores lidos pelos três ficcionistas / This work adopts as a theoretical basis, a perspective developed from the examination of certain ideas present in the fictional work of Enrique Vila-Matas - presented in his novels Bartleby & Co. ("the Non-writing", "negative pulse of contemporary literature", "withdrawal and literary mutism, "renunciation of writing") and Montanos Malady ("literary disease", "sick of literature", "literatose") - and in essayist of Ricardo Piglia, in "The last reader" ("last reader", "the addicted reader, who cannot stop reading", the reader for "reading is not just a practice, but a way of life", "the reader as the personification of literature"). From these ideas, this thesis speculates on the relationship between writing of Machado de Assis, the universe of Franz Kafka and the work of Murilo Rubião. It was adopted as a methodology comparative reading of these authors, highlighting the stories of Murilo Rubião, and some of the writers read by the three novelists

This thesis describes a research investigation into the implementation of the Last Planner System (LPS) in Nigeria, to improve construction processes within the Nigerian construction industry. LPS is known to be the most developed practical use of Lean Construction. It focuses on minimising the negative impacts of variability, uncertainties, buffers, making projects more predictable, creating reliable work plans and convalescing collaborative planning. However, the Nigerian construction industry is associated with a number of challenges which impair its performance. These challenges were grouped and classified into six major barriers: these include: supervision and quality control, fluctuation and variations, subcontractor involvement, resistance to change, cultural issues, and lengthy approvals. Consequently, a Design Science Research (DSR) approach is adopted to evaluate the effectiveness of implementing LPS in construction projects in Nigeria. In order to achieve this aim, an Action Research strategy is adopted and three case studies are reported; two of these cases describe how LPS was successfully implemented in construction projects within Nigeria. While the third case involved an investigation into the state of production plan reliability, of a successful project in Nigeria. These projects were selected based on non-probabilistic sampling from different geographical locations in Nigeria to represent different kinds of construction projects within the country. The first and second cases involved the implementation of LPS within the construction of a prototype student’s hostel and the construction a 4 Kilometre single carriageway road respectively. The third on the other hand involved the construction of a multipurpose hydro-power dam project; where comparisons were made between typical LPS projects and the project management techniques applied within the project. Data was collected through observation site activities, interviews, documentary analysis and questionnaire survey. The data generated was subsequently analysed by means of content analysis and evaluated in terms of its reliability, validity, representativeness, flexibility, rigour and reflexivity. In view of the LPS implementation within the two case studies, six barriers were identified and classified together with the six barriers associated with the Nigerian Construction industry. These barriers were linked, measured and ranked in averages of their degrees of occurrences. It was revealed that the major barriers were cultural issues and resistance to change, while the others include; lengthy approval, subcontractor’s involvement, poor supervision and quality, fluctuations and variations. Hence, a framework was developed to mitigate these barriers, when implementing LPS in construction projects in Nigeria. The main steps of the framework include: the need to identify purpose; the need to identify stakeholders impact; the need to obtain Sponsorship; the need to build a cross functional team; the need to create measurement indices; the need for training on Lean techniques and LPS; and finally the need to create a right working climate. Furthermore a focus group between construction practitioners was organised to test and evaluate the framework developed. It was revealed from the focus group that the framework has the potential to facilitate the implementation process as proposed.