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Šebela, Petr. "Ekologická analýza elektrotechnických výrobků." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219278.
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This work deals with ecological design and appraisal of quality of the electronic devices throughout their life cycle. This area known worldwide as Eco-Design, becomes an integral part of all electro technical productions. This work brings out not only conception of the Eco-Design, but also next related areas with the aim to decrease limitation of negative impact on environment. At the end of the work is compared and summarized the ecological evaluation of the concrete product types.
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Taraseviciute, Agne. "Tenascin-C in the pathogenesis of breast cancer /." Connect to full text via ProQuest. Limited to UCD Anschutz Medical Campus, 2008.
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Thesis (Ph.D. in Cell Biology, Stem Cells, and Development) -- University of Colorado Denver, 2008.Typescript. Includes bibliographical references (leaves 102-114). Free to UCD Anschutz Medical Campus. Online version available via ProQuest Digital Dissertations;
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Fridjonsson, Liselotte, Mathilda Brink, and Malin Brytting. "Hållbar Textil Produktutveckling : med växtfärgning." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-518.
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Författarna har haft ett samarbete med Panduro Hobby i samband med deras årliga miljökampanj. Syftet med examensarbetet har varit att med hjälp av befintliga produktutvecklingsprocesser och livscykelanalyser (LCA) ta fram en hållbar textil produkt med växtfärgning. Tanken var att konsumenter sedan själva skall kunna ta fram och växtfärga denna hållbara textilprodukt. Miljömedvetenhet och hållbarhet inom textilindustrin är ett aktuellt ämne. Trots det saknar dagens konsumenter förståelse för textilindustrins påverkan på miljön och har bristande kunskap om textila material för att kunna göra miljövänliga val ute i handeln. Både konsumenter och företag uttrycker att de gärna vill bidra till en mer miljövänlig textilindustri men att de saknar kännedom, resurser och verktyg för att göra det. Därför valde författarna av examensarbetet att undersöka hur en hållbar textil produkt kan tas fram med hjälp av livscykelanalyser, produktutvecklingsmetoden Product Ideas Tree (PIT) samt växtfärgning. Alla steg under produktutvecklingsprocessen valdes ur miljöhänsyn och efter de förutsättningar som krävs för att göra en så miljövänlig textil produkt som möjligt. Resultatet av undersökningen blev en växtfärgad tygkasse i 100 % lin. Efter framtagningen av produkten gjordes en livscykelanalys benämnd MET-matris för att analysera produktens miljöpåfrestning. Matrisen konstaterade att produkten inte har avsevärda miljöbrister. Med examensarbetet och den framtagna produkten vill författarna uppmuntra konsumenter och företag till att fortsätta visa engagemang och intresse för förändringar som gynnar miljön med förhoppningen om att få fler att agera mer hållbart.The authors have had a collaboration with Panduro Hobby in addition to their annual environmental sustainability campaign. The aim of the thesis has been to develop a sustainable textile product with natural dye using existing product development processes and Life Cycle Assessment (LCA). The idea was that consumers later on would be able to produce this sustainable textile product and dye it themselves. Environmental awareness and sustainability in the textile industry is a topical subject. Nevertheless many consumers lack sufficient knowledge of textile materials to make environmentally friendly choices in the commerce. Both consumers and businesses express that they would like to contribute to a more environmentally friendly textile industry, but that they lack the knowledge, resources and tools to do it. Therefore, the authors of the thesis chose to explore how a sustainable textile product may be produced with the help of Life Cycle Assessment and the product development method Product Ideas Tree (PIT). All steps in the product development process were carefully chosen with consideration to the environment and the circumstances required to make the textile product as sustainable as possible. The study resulted in the development of a canvas bag made out of 100% linen dyed it with natural dye. After the product development a Life Cycle Analysis, referred to as MET Matrix, was done to analyse the product's environmental strain. The matrix noted that the product does not have significant environmental burdens. With the thesis and the produced product the authors would like to encourage consumers and businesses to continue to show commitment and interest in changes that benefit the environment, with the hope of getting more people to act more sustainably.
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Miyagi, Sueli Patricia Harumi. "Análise in vitro da expressão de proteínas da matriz extracelular (MEC) e de metaloproteinases da matriz (MMPs) em células-tronco adultas de polpa dentária humana." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/23/23145/tde-16092008-162434/.
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Células-tronco adultas podem ser isoladas de vários tecidos, dentre eles a polpa dentária humana, tecido originado na papila dentária do dente em desenvolvimento. Estas linhagens multipotentes podem ser estudadas sob vários aspectos, como na elucidação da histogênese de tumores. O objetivo deste estudo foi inferir a histogênese do mixoma odontogênico, neoplasia odontogênica benigna, analisando a expressão de proteínas da matriz extracelular (MEC) e de metaloproteinases da matriz (MMPs) em células-tronco adultas de polpa dentária humana. Três linhagens diferentes de células-tronco originadas de polpas dentárias humanas IDPSCs (DL-1, DL-2 e DL4) foram utilizadas. As proteínas analisadas foram as mesmas expressas na neoplasia: vimentina, colágeno tipo I, fibronectina, tenascina, ácido hialurônico e MMPs (MMP-1, MMP-2 e MMP-9). Imunofluorescência e ensaios enzimáticos foram utilizados para analisar a presença de proteínas nas células cultivadas e no meio de cultura condicionado por estas células, respectivamente. Todas as linhagens celulares expressaram a vimentina e nenhuma expressou o ácido hialurônico. A linhagem celular DL-1 expressou todas as outras proteínas da matriz extracelular estudadas, enquanto que na linhagem DL-2 apenas não foi observada a expressão do colágeno tipo I. Fibronectina e tenascina não foram observados na linhagem DL-4. Todas as linhagens expressaram todas as MMPs, sendo que a produção de MMP-2 nas três linhagens foi significantemente maior que a de todas outras MMPs. Baseado nas condições deste estudo, é possível concluir que a expressão de proteínas da MEC e de MMPs em células-tronco de polpa dentária humana apresentaram perfil similar àquela apresentada no mixoma odontogênico, exceto pela ausência de marcação do ácido hialurônico em todas as linhagens. A ausência de secreção de ácido hialurônico pelas IDPSCs poderia indicar que o mixoma odontogênico deriva de uma célula mais diferenciada que as células-tronco.Adult stem cells can be isolated from different tissues including the human dental pulp, a structure originated from the dental papillae. These cell lineages are of importance in a series of studies, as the analysis of tumors histogenesis. The aim of this study was to infer the histogenesis of odontogenic myxoma, a benign odontogenic neoplasia by analyzing the ECM and MMPs molecules expressed in human dental pulp stem cells. Three different lineages of immature dental pulp stem cells (IDPSCs) (DL-1, DL-2 and DL-4) were used. The proteins searched were those expressed by the tumoral cells: vimentin, type I collagen, fibronectin, tenascin and hialuronic acid (HA) and the matrix metalloproteinases (MMP-1, MMP-2 and MMP-9). Immunofluorecence and enzymatic assays were used for analyzing the presence of the proteins in the cells and in the culture media conditioned by the cells, respectively. All the lineages expressed vimentin; however none expressed HA. DL-1 lineage expressed all the other ECM proteins, and the expression of type I collagen was not observed in the DL-2 lineage. Fibronectin and tenascin were not observed in the DL-4 lineage. All the lineages expressed all the MMPs. The release of MMP-2 from all cell lineages was significantly higher than those of all other MMPs. Based on the conditions of this study its possible to conclude that the overall expression of MEC proteins and MMPs in the lineages of human dental pulp stem cells were similar to those found in the odontogenic myxoma, except for the absence of hyaluronic acid. The absence of HA secretion by the IDPSCs could indicate that the odontogenic myxoma tumoural cells derive from a cell more differentiated than the stem cells.
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Liu, Yang. "‘Tri-3D’ electron microscopy tomography by FIB, SEM and TEM : Application to polymer nanocomposites." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0076/document.
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Ce travail a porté sur la caractérisation et la quantification en 3D de la répartition de charges de différents types (nanoparticules, nanotubes, etc.) dans des matrices polymères. Nous nous focalisons sur les techniques de tomographie en microscopie électronique. Une approche multiple en tomographie électronique a été réalisée : la tomographie en FIB/MEB (faisceau d’ions focalisé/microscope électronique à balayage), la tomographie en MEB et la tomographie en MET (microscope électronique en transmission). Les nanocomposites polymère sont généralement élaborés aux fins d’améliorer les propriétés physiques (mécanique, électrique, etc.) du matériau polymère constituant la matrice, grâce à une addition contrôlée de charges nanométriques. La caractérisation de tels matériaux, et l’établissement de corrélations précises entre la microstructure et les propriétés d’usage, requièrent une approche tri-dimensionnelle. En raison de la taille nanométrique des charges, la microscopie électronique est incontournable. Deux systèmes de nanocomposite polymère ont été étudiés par une approche multiple de tomographie électronique : P(BuA-stat-S)/MWNTs (copolymère statistique poly (styrène-co-acrylate de butyl) renforcé par des nanotubes de carbone multi-parois), et P(BuA-stat-MMA)/SiO2 (copolymère statistique poly(butyl acrylate-co-methyl methacrylate) renforcé par des nanoparticules de silice). Par combinaison de divers techniques, la caractérisation et la quantification des nanocharges ont été possibles. En particulier, la taille, la fraction volumique et la distribution des charges ont été mesurées. Cette étude a ainsi fourni des informations en 3D qui contribuent à mieux comprendre les propriétés des nanocomposites. Une attention particulière a été portée aux artefacts et causes d’erreur possibles durant l’étape de traitement 3D. Nous avons également essayé de comparer les différentes techniques utilisées du point de vue de leurs avantages et inconvénients respectifs, en dégageant des possibilités d’amélioration futureThis work is focused on the characterization and quantification of the 3D distribution of different types of fillers (nanoparticles, nanotubes, etc.) in polymer matrices. We have essentially used tomography techniques in electron microscopy. Multiple approaches to electron tomography were performed: FIB-SEM (focused ion beam/scanning electron microscope) tomography, SEM tomography and TEM (transmission electron microscope) tomography. Polymer nanocomposites are basically synthesized in order to improve the physical properties (mechanical, electric, etc.) of the pure polymer constituting the matrix, by a controlled addition of fillers at the nanoscale. The characterization of such materials and the establishment of accurate correlations between the microstructure and the modified properties require a three-dimensional approach. According to the nanometric size of the fillers, electron microscopy techniques are needed. Two systems of polymer nanocomposites have been studied by multiple electron tomography approaches: P(BuA-stat-S)/MWNTs (statistical copolymer poly(styrene-co-butyl acrylate) reinforced by multi-walled carbon nanotubes) and P(BuA-stat-MMA)/SiO2 (statistical copolymer poly(butyl acrylate-co-methyl methacrylate) reinforced by silica nanoparticles). By combining various techniques, the characterization and the quantification of nanofillers were possible. In particular, statistics about size, distribution and volume fraction of the fillers were measured. This study has then provided 3D information, which contributes to a better understanding of properties of the nanocomposites. Attention has been paid to analyze carefully original data, and artifacts and causes of errors or inaccuracy were considered in the 3D treatments. We also attempted to compare benefits and drawbacks of all techniques employed in this study, and perspectives for future improvements have been proposed
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Hölttä, Pirkko. "Radionuclide migration in crystalline rock fractures : laboratory study of matrix diffusion." Helsinki : University of Helsinki, 2002. http://ethesis.helsinki.fi/julkaisut/mat/kemia/vk/holtta/.
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Martins, Alessandra Ribeiro. "Matriz africana em Campinas: territ?rios, mem?ria e representa??o." Pontif?cia Universidade Cat?lica de Campinas, 2017. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/928.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
African matrix refers to every ancestral cultural heritage, territorial, monumental, linguistic and organizational, both in documents and urban vestiges as in orality, transmitted by black Africans enslaved and preserved in the territory by memory through manifestations, reinventions and reterritorialisations in Campinas in the form of groups, Marches, processions, cultural manifestations, peoples and traditional communities. All manifestations have as a fundamental representation for their existence and practice the commitment to the transmission of knowledge, safeguard and preservation of this African ancestry, including the permanent struggle against racism, discrimination and diverse intolerances. This thesis developed a new look at the spaces and territories of the Campinas' African matrix, focusing on the contributions of groups, points of culture, movements and cultural manifestations, traditional ?terreiro? communities (Umbanda, Candombl? etc) and the contemporary formation and reterritorialisations of these places. For this, it investigated the historical construction, post-abolition of slavery and the apparent "invisibility" of the African matrix in the city; The strategies of official erasure of this memory and cultural vestiges; And analyzed the process of reconstitution of records and spatial and cultural vestiges, with the 1998 Constitution as the basis for the elaboration of public policies related to this matrix.It said that African cultural heritage in its knowledge, values and practices increases its visibility through the struggle of the black movement, cultural groups and traditional peoples and communities. Valuing the wealth of this contribution implied in the obligation and the contradiction of recognizing the place of subalternization and stereotypy conferred on black people in Brazilian society and the commitment to the territorial transformation of this reality.It was important to realize that spatial inequality is incorporated into social inequality by merging, in urban space, the interests of capital, state action and the struggle of broad segments of the population as a form of resistance against segregation and the right to the city. This thesis recovered several actions of people and groups linked to the African matrix that contributed, and still do, to the construction of Campinas, even when in its daily life this city seems to move away from them; Campinas, when planned, organized and constructed, faced the choices of its leaders and the actions of the movements so that the population in its totality was inserted.It was when this work was inserted reworking the understanding of this identity of African matrix, from the perception of the possibilities of self representation in the urban space by the local cultures.
Matriz africana ? toda heran?a ancestral cultural, territorial, monumental, lin-gu?stica e organizacional, tanto em documentos e vest?gios urbanos quanto na orali-dade, transmitidos pelos negros africanos escravizados e preservados no territ?rio pela mem?ria atrav?s de manifesta??es, reinven??es e reterritorializa??es em Campinas em forma de grupos, marchas, cortejos, manifesta??es culturais, povos e comunidades tradicionais. Todas as manifesta??es t?m como representa??o fundamental para sua exist?ncia e pr?tica o compromisso com a transmiss?o de saberes, salvaguarda e preserva??o dessa ancestralidade africana, incluindo a luta permanente contra o racismo, discrimina??o e intoler?ncias diversas. Essa tese desenvolveu um novo olhar sobre os espa?os e territ?rios de matriz africana de Campinas, focando nas contribui??es dos grupos, pontos de cultura, movimentos e manifesta??es culturais, comunidades tradicionais de terreiro (Umbanda, Candombl? etc) e na forma??o e reterritorializa??o contempor?nea desses lugares. Para tanto, investigou a constru??o hist?rica, p?s-aboli??o da escravid?o e a aparente ?invisibilidade? da matriz africana na cidade; as estrat?gias de apagamento oficial dessa mem?ria e dos vest?gios culturais; e analisou o processo de reconstitui??o dos registros e vest?gios espaciais e culturais, tendo a Constitui??o de 1998 como base para a elabora??o de pol?ticas p?blicas referentes a essa matriz. Avaliou que a heran?a cultural de matriz africana em seus saberes, valores e pr?ticas amplia sua visibilidade por meio da luta do movimento negro, dos grupos culturais e dos povos e comunidades tradicionais. Valorizar a riqueza desta contribui??o implicou na obriga??o e na contradi??o de reconhecer o lugar de subalterniza??o e estereotipia conferidos aos negros e negras na sociedade brasileira e o compromisso com a transforma??o territorial desta realidade. Foi relevante perceber que a desigualdade espacial se incorpora ? desigualdade social ao se fundirem, no espa?o urbano, os interesses do capital, a a??o do Estado e a luta de amplos segmentos da popula??o como forma de resist?ncia contra a segrega??o e pelo direito ? cidade. A tese recuperou v?rias a??es de pessoas e coletivos ligados ? matriz africana que contribu?ram, e ainda contribuem, para a constru??o de Campinas, mesmo quando em seu cotidiano essa cidade parece rumar para longe delas; Campinas, ao ser planejada, organizada e constru?da, enfrentou as escolhas de seus dirigentes e a atua??o dos movimentos para que a popula??o em sua totalidade fosse inserida. Foi a? que este trabalho se inseriu ao reelaborar a compreens?o dessa identidade de matriz africana a partir da percep??o das possibilidades de auto representa??o no espa?o urbano pelas culturas locais.
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Olea, Mejía Oscar Fernando Brostow Witold. "Micro and nano composites composed of a polymer matrix and a metal disperse phase." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-5135.
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Solano, Lorrainy da Cruz. "O corpo como matriz pedag?gica." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/14704.
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Previous issue date: 2010-12-01The contemporary conjuncture based on the capitalistic knowledge converges to the corporal consciousness that makes us see, feel, taste and hear, be in/to pieces. Disembodied reason legitimate and legislate ways of being and living socially and its development is the dehumanization of human relations causing pain and suffering. The objective of this work is to discuss the body as pedagogical matrix through imagistic/artistic elements: music, painting and literature. Metaphors lead to self knowledge of human subjectivity and approach us to the kaleidoscope of sensitive knowledge and enables learning to learn with the infinite combinations of images, knowledge, feelings and worldviews. The song Mem?ria da Pele comes in the voice of Maria Bet?nia speak of the memories that are not mine, but are tattooed in me in the memory of skin, singing the memories of a love lived by who tries to forget rationally, but the body insists on remembering. It is password to think about what we are. The short story by Clarice Lispector, entitled Miss Algarve, narrates the life story of an unmarried and virgin woman, and her encounter with an alien called Ixtlan. Until then, she who lived as if every day were a Monday, found herself seduced by the pleasure of having a body in contact with another body, which also allowed her to give visibility to the bodies of others. She had repudiation by the immorality that her body and the other s perspired. The discovery of the body brings important lessons for nursing, involving our body and the others'. The painting the flying bed or Henry Ford Hospital, by Frida Kahlo, is our final metaphor. The traumatic experience of abortion is shown in this painting trough the picture of the artist naked in a hospital bed. This painting invites us to reflect on our work process. We need to think in multiple dimensions of the being and accept the invitation of art, so that the lightness confronts us with the weight imposed by the hegemonic ideology. I believe it is not a single view, but the many views that should justify the knowledge and practices of nursing; what matters is that they are woven into the dialogue, democracy, provided that protagonism of those individuals involved in this process, in the wandering and uncertainty, in the rewiring, solidarity, plurality. To this end, the body must be the great pedagogue that is able to be viewed not as a tapestry seen by the right view, as the logical knowledge sees, but seen by the opposite side in its singular, irregular, discontinuous weavings
A conjuntura contempor?nea alicer?ada no saber capital?stico conflui para a inconsci?ncia corporal que nos faz ver, sentir, saborear, ouvir, ser em/aos peda?os. A raz?o descorporificada legitima e legisla modos de ser e de viver socialmente e tem como desdobramento a desumaniza??o das rela??es humanas, causando dor e sofrimento. O objetivo deste trabalho ? discutir o corpo como matriz pedag?gica mediante elementos imag?sticos/art?sticos: m?sica, pintura e literatura. As met?foras levam a um auto conhecimento da subjetividade humana e nos aproxima do caleidosc?pio do saber sens?vel e possibilitam aprender a aprender com as infinitas combina??es de imagens, conhecimentos, sentimentos e vis?es de mundo. A m?sica Mem?ria da Pele vem na voz de Maria Bet?nia falar das lembran?as que n?o s?o minhas, mas est?o em mim tatuadas na mem?ria da pele, cantando as recorda??es de um amor vivido de quem tenta esquecer racionalmente, mas que o corpo teima em lembrar. ? uma senha para pensar no que somos. O conto de Clarice Lispector, intitulado Miss Algrave, narra a hist?ria de vida de uma mulher solteira e virgem, e seu encontro com um extraterrestre chamado Ixtlan. At? ent?o, ela que vivia como se todos os dias fossem uma segunda-feira, se viu seduzida pelo prazer em ter um corpo em contato com outro corpo, o que lhe permitiu tamb?m dar visibilidade aos corpos dos outros. Tinha rep?dio pela imoralidade que os corpos dos outros e o seu transpiravam. A descoberta do corpo traz li??es importantes para a enfermagem, envolvendo o nosso e os outros corpos. A tela cama voadora ou o Hospital Henry Ford, de Frida Kahlo, ? nossa ?ltima met?fora. A experi?ncia traum?tica do aborto ? mostrada nessa tela atrav?s da pintura da artista nua em cima de uma cama de hospital. Essa tela nos convida a refletir sobre nosso processo de trabalho. Precisamos pensar na multidimensionalidade do ser e aceitar o convite da arte, para que a leveza nos confronte com o peso imposto pelo ide?rio hegem?nico. Acredito n?o ser uma ?nica vis?o, mas as muitas vis?es que devam fundamentar os saberes e fazeres da enfermagem; o que importa ? que sejam eles tecidos no di?logo, na democracia, na condi??o de protagonismo dos sujeitos envolvidos nesse processo, na err?ncia e incerteza, na religa??o, na solidariedade, na pluralidade. Para tanto, o corpo deve ser o grande pedagogo capaz de ser olhado n?o como uma tape?aria vista pelo direito, como v? o saber l?gico, mas vista pelo avesso em suas tramas singulares, irregulares, descont?nuas
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Johansson, M. Annette. "Immunosensor methods for drug residue control of food : assay design and sample matrix effects /." Uppsala : Dept. of Microbiology, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a457.pdf.
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Dahl-Madsen, Johanna. "Användandet av APU/APL uppföljningssystemet : Hur uppfattar elever, handledare och yrkeslärare att det fungerar?" Thesis, Högskolan i Halmstad, Sektionen för lärarutbildning (LUT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-20046.
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Denna forskning handlar ett system som jag och min kollega Pierre Brockmanns skapade för att kunna visa för eleven hur han/hon ligget till i sina kurser som praktiseras ute i arbetslivet. Efter en inspektion från Skolverket uppdagades det att tydligheten på det gamla systemet inte var tillfredsställande. I studien har jag använt mig av kvalitativ studie för att få veta vad elever, handledare och yrkeslärare upplever att det fungerar. Tack vare djupintervjuerna fram kom förbättrings förslag vilket har lätt till att APU/APL- uppföljningssystemet har kunnat vidareutvecklas, och bli ännu tydligare. Även dokumentationen inne på skolan har utvecklats, för att tydliggöra för eleven ”vart den är på väg”. För handledarna har systemet betytt mer förståelse för att det är skola som eleven gör ute på sin praktik, och att medvetenhet om vad som skall läras på praktiken har gjorts tydligare. Yrkeslärarna känner sig mer professionella och att de har ett meningsfullt uppdrag när de är på APU/APL besök. De önskar också att mer tid för utveckling och för att få sätta sig in i och skapa bättre matriser hade schemalagts.This research is a system that I and my colleague Pierre Brockmann created to show the student how the Ligget in their courses as practiced in working life. After an inspection by the National Agency revealed that the clarity of the old system was not satisfactory. In the study I have used the study to find out what students, tutors and trainers feel that it works. Thanks depth interviews came suggestion for improvement which have been easy to APU/APL- monitoring system has been further developed, and become even clearer. Although the documentation inside the school has developed, to make it clear to the student "where it is heading”. For supervisors, the system has meant more understanding because it's school that the student does outside of his practice, and that awareness of what is learned in practice have been clarified. Vocational Teachers feel more professional and have a meaningful mission when they are on the APU / APL visit. They also want more time for development and to get acquainted with and create better matrices had been scheduled.
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Koremura, Yuka O'Connor Brian C. "Toward an ideal library a synthesis of Wilson's library and information policy and Gilbert's performance matrix /." [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-9070.
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Zivcovich, Franco. "Backward error accurate methods for computing the matrix exponential and its action." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/250078.
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The theory of partial differential equations constitutes today one of the most important topics of scientific understanding. A standard approach for solving a time-dependent partial differential equation consists in discretizing the spatial variables by finite differences or finite elements. This results in a huge system of (stiff) ordinary differential equations that has to be integrated in time. Exponential integrators constitute an interesting class of numerical methods for the time integration of stiff systems of differential equations. Their efficient implementation heavily relies on the fast computation of the action of certain matrix functions; among those, the matrix exponential is the most prominent one. In this manuscript, we go through the steps that led to the development of backward error accurate routines for computing the action of the matrix exponential.
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Marumoto, Ariane. "Complexo Quinômico envolvido com adaptação de osteoblasto em scaffold orgânico sob condição de diferenciação celular." Botucatu, 2016. http://hdl.handle.net/11449/143761.
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Orientador: Willian Fernando ZambuzziResumo: Modelos in vitro têm facilitado a análise da fisiologia celular sob condições experimentais diversas; trata-se de modelo alternativo ao uso de animais de experimentação, que vem sendo difundido e aceito amplamente em pesquisa científica. Além disso, estes modelos têm levado à avanços significativos na compreensão das interações mútuas e adaptativas entre células e substratos. Neste trabalho, nosso objetivo foi analisar eventos moleculares responsáveis pela adaptação de preosteoblastos em substrato orgânico composto por componentes da Matriz Extracelular (MEC), sob condição de diferenciação celular. Metodologicamente, pré-osteoblastos (MC3T3-E1 50x103 células/ml) foram semeados sobre uma fina camada de Matrigel® gelificada e mantidos por 10 dias (37oC, 5% de CO2 em ambiente úmido) sob condição de diferenciação (meio de cultivo contendo 50 µg de ácido ascórbico e 10 mM de ß- glicerofosfato), com renovação do meio de cultivo a cada 3 dias. Alterações morfológicas foram monitoradas em microscópio invertido e mecanismos moleculares acompanhados pela análise global da atividade de quinases, através de arranjo de peptídeos (Pepchip). Curiosamente, nossos resultados mostraram mudanças morfológicas significantes durante adaptação celular as quais foram acompanhadas pela atuação de vias de sinalização celular distintas, responsáveis pela sobrevivência (Eixo PI3K-Akt) e proliferação (Eixo Retinoblastoma-ciclinas) celulares, além de proteínas envolvidas com metabolismo energético e comun... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: In vitro models have been proposed to analyze cellular physiology under various experimental conditions. It is an alternative model instead using experimental animals that have been widespread and widely accepted in scientific research. Moreover, it has led to significant advances in the understanding of mutual and adaptive interactions between cells and substrates. In this work, our aim was to analyze adaptive events of osteoblasts cultured on an organic substrate composed by components of the extracellular matrix (ECM) in the first 10 days of cultivation on differentiation condition. Methodologically, pre-osteoblasts (MC3T3-E1 pre-osteoblasts, 50x103 cells / ml) were seeded on a thin gelified Matrigel® layer and maintained for 10 days under standard cell culture conditions (37 ° C, 5% CO2 in a humid environment) under differentiation conditions (culture media containing 50 ug of ascorbic acid and 10 mM beta-glycerophosphate). The culture medium was changed every 3 days. Morphological changes were monitored using an inverted microscope and molecular mechanisms followed by comprehensive analysis of kinase activity by peptides arrangement (Pepchip). Interestingly, our results showed significant morphological changes during cell adaptation which were accompanied by distinct signaling pathways involving proteins responsible for survival (PI3K-Akt axis) and cell proliferation (Retinoblastoma-cyclins axis), in addition of proteins involved in energy metabolism and cellular communi... (Complete abstract click electronic access below)
Mestre
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Åberg, Oscar, and Edvin Sparf. "Validating the Meta Attack Language using MITRE ATT&CK matrix." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259297.
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When more and more devices are getting connected to each other and to the internet, the security of such devices becomes increasingly important. For large organizations with hundreds or even thousands of connected devices, it can be hard to determine the weak spots of the network in terms of security. A way of finding these weak spots is by using threat modelling. One language which can be used for this is the Meta Attack Language(MAL). The purpose of this report is to study which types of cyber attacks can be expressed with MAL. To do so eleven different attack techniques from the cyber attack database MITRE ATT&CK matrix are implemented in MAL. The report shows that many different attacks can be implemented in MAL. Since all of the randomly selected attacks were possible to implement in MAL this suggests that it is possible to implement all of the attacks from the MITRE ATT&CK matrix in MAL.När fler och fler enheter kopplas ihop med varandra och med internet blir säkerheten för dessa enheter allt viktigare. Stora organisationer, som kan ha hundratals eller tusentals uppkopplade enheter, kan ha svårt att hitta svagheter i deras säkerhet. Dessa svagheter kan hittas med hjälp av hotmodellering. Meta Attack Language(MAL) kan användas för detta. Syftet med denna rapport är att studera vilka sorts cyberattacker som kan implementeras i MAL. För att göra detta har elva attacktekniker från cyberattacksdatabasen MITRE ATT&CK matrix implementerats i MAL. Rapporten visar att flera olika sorters cyberattacker kan implementeras i MAL. Eftersom slumpmässigt valda attackteknikerna gick att implementera i MAL, är det troligt att alla attackteknikerna i MITRE ATT&CK matrix kan implementeras i MAL.
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Tindefjord, Norlander Anna. "Lärandematris med elevperspektiv : En litteraturstudie om hur en lärandematris kan skapas utifrån en bedömningsmatris med hjälp av en femstegsmodell." Thesis, Karlstads universitet, Institutionen för språk, litteratur och interkultur (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-72844.
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Med hjälp av den här undersökningen i svenska med didaktisk inriktning skapas en uppgiftspecifik lärandematris utifrån en bedömningsmatris med hjälp av Johan Alms femstegsmodell. Avsikten med lärandematrisen är att synliggöra lärandet för eleven och baseras på de styrdokument som Skolverket tillhandahåller. Den har ett elevperspektiv, vilket skiljer den från den mer vedertagna bedömningsmatrisen, som har ett bedömningsperspektiv ur pedagogens vinkel. Lärandematrisens uppbyggnad med tydlig layout och lättillgängligt språk underlättar för elevens förståelse för uppgiften och dess progression vilket bör bidra till ökat kunskapsintag. Litteraturstudiens resultat bekräftar att femstegsmodellen är användbar i skapandet av lärandematrisen, och bekräftar därmed syfte och frågeställning.With the help of this research in Swedish with didactic focus, a task-specific learning matrix is created based on an assessment matrix using Johan Alm's five-step model. The intention of the learning matrix is to make the learning visible to the student and is based on the steering documents provided by the National Agency for Education. It has a student perspective, which distinguishes it from the more accepted assessment matrix, which has an assessment perspective from the educator´s aspect. The structure of the learning matrix with clear layout and easily accessible language facilitates the student's understanding of the task and its progression, which should contribute to increased knowledge intake. The result of the literature study confirms that the five-step model is useful in the creation of the learning matrix, thereby confirming the purpose and research question.
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Ågren, Carina. "Unga truppgymnasters rörelsekontroll beskrivet med ett screeningtest – Performance Base Matrix : En pilotstudie." Thesis, Linnéuniversitetet, Institutionen för pedagogik, psykologi och idrottsvetenskap, PPI, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-24446.
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Bakgrund: Truppgymnastik är en relativt ung tävlingsgren inom gymnastik med ursprung från de Nordiska länderna. I Sverige är det den mest utövade formen av tävlingsgymnastik med flest rapporterade skador i nedre extremiteten samt återkommande besvär i ryggen. Tester i syfte att förebygga skador är efterfrågade och få studier har utvärderat tester för idrottande barn och ungdomar. Syftet med studien var att beskriva en grupp unga truppgymnaster utifrån bakgrundsvariabler, och rörelsekontroll med screeningtestet Performance Base Matrix samt att mäta förekomst av muskuloskelettala skador under en period på sju månader. Metod: Nitton unga truppgymnaster (flickor,7-9 år) genomförde screeningtestet Base Matrix i syfte att bedöma deras rörelsekontroll vid låg respektive/ low threshold och hög belastning/ high threshold. Testerna analyserades visuellt och genom videoupptagning. Resultatet av testerna dokumenterades i ett protokoll som bearbetades on-line samt för beräkning av procentuell förekomst av sämre utförd test i form av svaga länkar. Information om skadeförekomst inhämtades från föräldrar och tränare. Resultat: Alla försökspersoner genomförde screeningtesterna i sin helhet. Försökspersonerna hade en medelpoäng av 15 (max 50), där fler poäng anger fler svaga länkar/ weak links. Vid låg belastning var ländrygg/bäcken i flexion/ Low back/pelvis flexion den mest förekommande svaga länken (58%). Vid hög belastning var anterior rotation i skuldran / shoulder tilt den mest förekommande (63%). Tre skador rapporterades under tidsperioden: två fotledsskador och ett nackbesvär. Konklusion: Denna studie indikerar att screeningtestet Base Matrix är genomförbart på unga truppgymnaster. Resultaten visar att skuldra framför allt under hög belastning samt ländrygg/bäcken framför allt under låg belastning är områden som uppvisar flest svaga länkar. Detta indikerar att dessa områden vore särskilt att beakta i skadeförebyggande träning av unga truppgymnaster.Background: Team gym is a relatively new kind of competition in gymnastics with its origin from the Nordic countries. In Sweden it is the most practiced form of competitive gymnastics. Correlations have been found between altered trunk control and injuries in the extremities. Injury prevention testing is performed more frequently and tests requested for improving the training regimen.The purpose of this study was to describe a group of young team gymnasts regarding background variables, test results from Performance Base Matrix screening test and injury incidence during a period of seven months. Method: Nineteen team gymnasts, 7-9 year-old, were screened with the protocol Base Matrix for uncontrolled movement (weak links) under low and high load (threshold). Background data were collected on age, height, weight, dominant side, injuries in the recent year and the practice of other sports. The coaches were asked to register the number of injuries over a period of seven months.Results: The mean age was 8.8 years, BMI 16.1, 89% were right-handed and the average value of the Base Matrix score of 15 out of 50. Two injuries to the ankle and one on the neck reported totally from coaches and parents. Among the most apparent weak links were Low back / pelvis flexion at low load (58% of group) while the shoulder tilt at high load (63% of the group).Conclusion: The result indicates that the Base Matrix screening test is feasible to use in young gymnasts. More studies are needed to confirm the results. The result indicates that the shoulder especially under high load and the lower back especially under low load were the body segments that showed the most weak links. These parts of the body are the most important to take into consideration in the training of the young team gymnasts.
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Smith, Donna M. "Matrix Assisted Laser Desorption Ionization Quadrupole Time-of-Flight Mass Spectrometry of Poly(2-Vinylpyridine)." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1110337309.
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Silva, Jo?o Paulo Melo da. "Estudo comparativo das propriedades mec?nicas em comp?sitos da fibra modal e poliester." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15681.
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Previous issue date: 2012-03-14In the present work, three composites with distinct reinforcements (polyester, modal e polyester + modal), all if a unsaturated orthophthalic polyester resin as matrix were used, in order to conduct a comparative study by mechanical tests and water absorption. The fibre mats were prepared in a mat preparatory by immersion developed in the Textile Engineering Laboratory. The composites were manufactured using a closed mould process by compression using an unsaturated orthophthalic polyester resin as matrix and 1% MEK (methyl ethyl ketone peroxide) as an initiator. In each composite twelve samples with the dimensions of 150x25x3 mm were cut randomly for the mechanical analysis (tension x extension, three points bending and water absorption and Scanning Electron Micsroscopy). The mechanical tests were carried out in the Laborat?rio de Metais e Ensaios Mec?nicos UFRN . All the analyses were carried out according to the ASTM norms. The resultant samples from the mechanical analysis were subjected for the Scanning Electron Microscopy analysis. Based on the results obtained, it was observed that the reinforced composite with two fibres (modal + polyester) presented better results in comparison to the other two composites both in the tension/extension as well on the three point bending tests. In the water absorption test, it was possible to observe an equilibrium in the water absorption by the modal and polyester composite, due to the union of the two fibres. In the SEM images, the regions of rupture in the composites as well as the adsorption between the fiber and the matrix could be observed
No presente trabalho foram fabricados tr?s comp?sitos com refor?os distintos (poli?ster, modal e poli?ster + modal), todos com uma matriz de resina de poli?ster ortofit?lico n?o saturado, com o objetivo de realizar um estudo comparativo atrav?s de ensaios mec?nicos e absor??o d ?gua. As mantas de fibras foram preparadas num preparador de manta por imers?o desenvolvido no Laborat?rio de Engenharia T?xtil da UFRN. Os comp?sitos foram fabricados usando o processo de molde fechado por compress?o, utilizando a resina de poli?ster ortoft?lica e 1% de per?xido MEK (per?xido de metil etil cetona) como iniciador. Em cada comp?sito foram cortadas doze amostras aleatoriamente, com as dimens?es 150x25x3 mm, para avalia??o atrav?s de ensaios mec?nicos (resist?ncia ? tra??o e ? flex?o, absor??o d agua e microscopia eletr?nica de varredura). Os ensaios de tra??o e flex?o em tr?s pontos foram realizados no Laborat?rio de Metais e Ensaios Mec?nicos - UFRN. Todas as an?lises estavam de acordo com as normas da ASTM. As amostras resultantes dos ensaios mec?nicas foram avaliadas no MEV. Com base nos resultados dos ensaios mec?nicos, observou-se que o comp?sito refor?ado com as duas fibras em conjunto (poli?ster+modal) apresentou um melhor comportamento quando foram expostos a carregamentos tanto de tra??o quanto de flex?o. No ensaio de absor??o d agua foi poss?vel observar um equilibribio na absor??o de umidade do comp?sito com modal e poli?ster, devido a uni?o das duas fibras. Nas imagens do MEV foi poss?vel ver as regi?es de ruptura do comp?sito e a ades?o entre a fibra e a matriz
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Tzamtzis, Spyridon. "Solidification behaviour and mechanical properties of cast Mg-alloys and Al-based particulate metal matrix composites under intensive shearing." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/5079.
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Magnesium alloys, as the lightest of all structural metallic materials, and aluminium-based particulate metal matrix composites (PMMCs), offering unified combination of metallic and ceramic properties, have attracted increased interest from the automotive, aerospace, electronic and recreation industries. Current processing technologies for PMMCs do not achieve a uniform distribution of fine-sized reinforcements and produce agglomerated particles in the ductile matrix, which are detrimental to the ductility. At the same time, molten magnesium alloys contain impurities and oxides and when cast conventionally, the final components usually exhibit a coarse and non-uniform microstructure with various casting defects. The key idea in this thesis has been to adopt a novel intensive melt conditioning process, allowing the application of sufficient shear stress that would disperse solid particles present in the melt and offer unique solidification behaviour, improved fluidity and die-filling during casting. The Melt Conditioned High Pressure Die Casting (MC-HPDC) process, where intensive shearing is directly imposed on the alloy melt, which is then cast by the conventional HPDC process, has been used to produce PMMC and magnesium alloy castings. The MC-HPDC process for PMMCs leads to a uniform dispersion of the reinforcement in the matrix, confirmed by quantitative statistical analysis, and increased mechanical performance as indicated by an increase in the hardness and the tensile properties of the composites. We describe a solidification path for aluminium containing magnesium alloys, where intensive shearing prior to casting leads to effective dispersion of solid oxide particles, which then effectively act as nucleation sites for magnesium grains, resulting in significant grain refinement. The MC-HPDC processed magnesium castings have a significantly refined microstructure, with reduced porosity levels and casting defects. Evaluation of the mechanical properties of the castings reveals the beneficial effect of intensive shearing. After careful optimization, the MC-HPDC process shows promising potential for the direct recycling of high purity magnesium die casting scrap, producing casting with mechanical properties comparable to those of primary magnesium alloys.
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Elgenberg, Madeleine. "Att arbeta med bedömningsmatriser i slöjdämnet." Thesis, Malmö högskola, Lärarutbildningen (LUT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-34510.
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Under de senaste decennierna har användandet av matriser som ett betydelsefullt redskap i bedömningsarbetet, vuxit fram inom den svenska skolan. En konstruktivistisk kunskapssyn har ställt krav på nya redskap för att möta förändringar i undervisningens innehåll och kunskapskrav. Syftet med detta examensarbete är att undersöka på vilka sätt lärare i grundskolan arbetar med bedömningsmatriser i slöjdämnet samt varför denna form av bedömningsarbete sker. Tre lärare har intervjuats med utgångspunkt från en kvalitativ forskningsansats med målsättningen att få en så mångsidig och djupgående uppfattning som möjligt om deras uppfattningar, erfarenheter och upplevelser av problemområdet. Utifrån sina referensramar uppfattar och tolkar lärarna en del av sin yrkesmässiga verklighet. Av resultatet framkommer att det inte finns några detaljerade, övergripande bestämmelser för hur bedömningsarbete med hjälp av matriser ska utföras. Några generella slutsatser kring hur lärare arbetar med matriser kan inte dras eftersom de tre lärarnas uppfattningar varierar. De arbetar enligt givna förutsättningar på sina respektive arbetsplatser och på grundval av sina erfarenheter inom yrket. De enda omständigheter som förenar de tre lärarna är att matrisarbetet introducerats av de olika skolornas huvudmän och att de inte själva tagit aktiv del i upprättandet av de matriser de använder sig av.
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Söderlin, Maria. "A population-based study on early arthritis in southern Sweden : incidence, preceding infections, diagnostic markers and economic burden /." Linköping : Univ, 2003. http://www.ep.liu.se/diss/med/08/24/index.html.
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Sohl, Magnus. "Bedömning av loggbok : Bedömning av loggbok med en uppgiftsspecifik matris." Thesis, Karlstads universitet, Institutionen för pedagogiska studier, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-35232.
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The purpose of my independent work was to develop and test a task-specific assessment matrix to the students writing logs that occurs in connection with their APL (workplace-based learning). The matrix is based on upper secondary school subject plan House building from The Swedish National Agency for Education and the four courses House building process, House building 1, House building 2 and House building 3 - conversion. Due to the matrix structure, I used the example matrix of Malmö University. The task-specific assessment must both serve as a guide for students in the implementation of the log writing, and in the evaluation of the assessment work. Both students and teachers then get a common assessment tool for evaluation. The matrix has been tested in the activity and then evaluated by both teachers and students through interviews. I have come to the conclusion that the matrix is perceived as clear and useful. I will in my work as a teacher use and further develop task-specific matrices because the result of my independent work shows that it supports and promote students development. Keywords Assessment matrix, task-specific, assessment, writing log
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Silva, Antonio Carlos Lopes da. "A análise das estratégias de desenvolvimento acadêmico da UFSCar e suas implicações para a distribuição de recursos do MEC : indicadores de gestão." Universidade Federal de São Carlos, 2011. https://repositorio.ufscar.br/handle/ufscar/1065.
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Previous issue date: 2011-05-31The fast growth experienced by UFSCar in recent years, in the spheres of education, research and extension was accompanied by a growth in its physical structure, with the creation of two new campuses. The immediate consequence was the increase in spending this new funding structure, which was not accompanied by corresponding increase in transfers of government funds, which has the matrix distribution of budget resources of the Ministry of Education, composed of academic and research indicators for each institution, a major source of federal funding of institutions of higher education. This dissertation, first, to present a review of the forms of financing higher education in Brazil, and particularly at UFSCar, and analyze and understand the many variables that make up the matrix distribution of budget resources of the MEC, based on the indicator Equivalent Student. For this second goal we applied the multivariate regression analysis on data matrix in order to subsidize an institutional policy to improve the current rate which determines the allocation of resources to UFSCar. As a result, the first objective, it was possible to confirm the difficulty of financing the maintenance of federal institutions of higher education, in this way, are dependent on the ability of its managers to seek extra resources for the development of education, research and extension. Regarding the results of the multivariate analysis, we identified that the main variables of the matrix are the number of graduates and the number of new students, showing that the model focuses on productivity without regard to quality. A model consisting of quantitative and qualitative variables would be more in line with the characteristics of the Brazilian federal universities, namely the pursuit of excellence.
O grande crescimento experimentado pela UFSCar nos últimos anos, nas esferas do ensino, pesquisa e extensão veio acompanhado de um crescimento de sua estrutura física, com a criação de dois novos campi. A conseqüência imediata foi o aumento dos gastos de custeio desta nova estrutura, que não foi acompanhada pelo respectivo aumento dos repasses das verbas governamentais, que tem na Matriz de Distribuição de Recursos Orçamentários do MEC, composta por indicadores acadêmicos e de pesquisa de cada instituição, uma das principais fontes de financiamento das instituições federais de ensino superior. Este trabalho busca, primeiramente, apresentar uma revisão das formas de financiamento da educação superior no Brasil e, particularmente, na UFSCar; e analisar e entender as diversas variáveis que compõem a Matriz de Distribuição de Recursos Orçamentários do MEC, baseada no indicador Aluno Equivalente. Para este segundo objetivo aplicou-se a análise de regressão multivariada nos dados da matriz com a finalidade de subsidiar uma política institucional para melhorar o atual índice que determina o aporte de recursos à UFSCar. Como resultado, no primeiro objetivo, foi possível confirmar a dificuldade de financiamento da manutenção das IFES que, desta forma, ficam dependentes da capacidade de seus gestores de buscarem recursos extras para o desenvolvimento do ensino, da pesquisa e da extensão. Em relação aos resultados da análise multivariada, identificou-se que as principais variáveis da matriz são o número de alunos formados e o número de alunos ingressantes, mostrando que o modelo privilegia produtividade sem levar em conta a qualidade. Um modelo composto por variáveis quantitativas e qualitativas estaria mais de acordo com as características das universidades federais brasileiras, ou seja, a busca da excelência.
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Witten, Neil. "The melt inpregnation of continuous fibre tows in the processing of thermoplastic matrix composites." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294808.
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Kollins, Kaitlin Noelle. "Investigation of Residual Stresses in Melt Infiltrated SiC/SiC Ceramic Matrix Composites using Raman Spectroscopy." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1513591335033283.
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Mac?do, Neto Miguel Cabral de. "Obten??o e caracteriza??o de um comp?sito de matriz polim?rica com carga de palha de a?o." PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, 2016. https://repositorio.ufrn.br/jspui/handle/123456789/22520.
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O surgimento de materiais comp?sitos tem o objetivo de se encontrar propriedades especificas desejadas para determinadas aplica??es, como melhor resist?ncia mec?nica, materiais mais leves, economicamente vi?vel, materiais recicl?veis e etc.Nessa perspectiva estudou-se a viabilidade do uso da palha de a?o para a obten??o de um comp?sito de matriz polim?rica. Foram testadas tr?s formula??es, com 10%, 15% e 20% de fibras do comp?sito. Para a caracteriza??o do comp?sito foram determinadas propriedades t?rmicas (condutividade, capacidade t?rmica, difusividade e resistividade), mec?nicas (tra??o e flex?o) e fisioqu?micas (MEV, DRX, densidade, absor??o e degrada??o). O comp?sito, em suas tr?s formula??es, apresentou resist?ncia mec?nica superior a quase totalidade dos comp?sitos j? estudados no laborat?rio LMHES. Essa maior capacidade de resist?ncia mec?nica esteve associada a utiliza??o de um fibra met?lica. No que diz respeito as propriedades t?rmicas, o comp?sito estudado apresentou uma menor capacidade de isolamento t?rmico que os outros comp?sitos anteriormente estudados. O comp?sito apresentou maior viabilidade para a absor??o de umidade e resist?ncia mec?nica. o pior resultado deu-se para aplica??es t?rmica onde sua condutividade t?rmica est? acima da maioria dos comp?sitos polim?rico mostrados pela literatura, em fun??o da utiliza??o de uma fibra met?lica. Foram realizados ensaios mec?nicos, t?rmicos dentre outros, apresentando ?timos resultados devido as propriedades espec?ficas do comp?sito proposto como resist?ncia a flex?o, e boa resist?ncia ? absor??o de meios aquosos. As propriedades do comp?sito pode ser utilizado para a fabrica??o de estruturas que n?o requeiram significativa resist?ncia mec?nica na tra??o, como por exemplo, prot?tipos solares e e?licos, como fornos e fog?es solares e p?s de aerogeradores.
Composite materials arise from the need of finding desired properties for certain applications, such as better mechanical resistance, lighter materials, cost-effectiveness, recyclable material, etc. The difficulties of disposal, recycling or reuse are now environmental concerns and therefore subject matter of much research. In this perspective we studied the feasibility of using steel wool for obtaining a polymeric matrix composite. Three formulations were tested, 10%, 15% and 20% of composite fibers. For the characterization of the composite were determined thermal properties (conductivity, heat capacity, diffusivity and resistivity), mechanical properties (traction and bending) and physiochemical properties (SEM, XRD, density, absorption and degradation). The composite in its three formulations had higher mechanical strength compared to almost all composites that have already been studied in the laboratory LMHES. This greater mechanical resilience was associated with the use of a metallic fiber. Regarding the thermal properties, the composite studied had a lower thermal insulation than other composites studied previously. The composite showed higher viability for humidity absorption and mechanical resilience. The worst result was in thermal applications where its thermal conductivity is above of most polymeric composites found in the literature, due to the use of a metallic fiber. Some tests were made, such as mechanical, thermal, among other tests, showing excellent results because of the specific properties of the composites proposed, namely flexural strength, and good resistance to absorption in aqueous environment. The properties of such composite can be used to make structures that do not require significant mechanical resilience in traction, for instance in solar and wind prototypes, such as ovens and solar powered cookers and wind generator blades.
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Flensburg, Alice, and Alice Pettersson. "Intressentdialoger : En studie om företags arbete med intressentdialoger för att utvecklahållbarhetsmål." Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448341.
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FN:s hållbarhetsagenda har bidragit till ökat fokus och organisationsanpassning avseende hållbarhetsarbete. Tidigare forskning har fokuserat på hållbarhetsrapportering av intressentdialoger genom GRI, men inte hur dialogerna utvecklas. Studiens syfte är således att studera hur företag praktiskt arbetar med intressentdialoger. Avsikten är att genom en fallstudie exemplifiera viktiga faktorer för intressentdialoger som bidrar till hållbarhetsmål, samt problem och möjligheter som uppstår. Utifrån teorin utformades analysmodellen med fem steg för intressentdialoger. Analysmodell och tre förväntningar användes som grund i analysen av empiriska resultat. Datainsamling inkluderade fyra intervjuer och kompletterande information från årsredovisning. Studiensresultat indikerar att de viktigaste aspekterna för intressentdialoger är relevant informationsspridning, ökat engagemang och kunskapsutveckling. Intressentdialoger erbjuder flexibilitet på lokal nivå, men måste utgå från företagets övergripande vision i hållbarhetsarbetet. Dialogerna har inslag av både struktur och tydlighet, i form av konkreta verktyg som materiality assessment, men innefattar också mer informell kommunikation.
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AL-Jabiry, Ekram. "Syntetisering av en ny MALDI-MS matris med användning av Suzukikopplingsreaktion." Thesis, Uppsala universitet, Institutionen för läkemedelskemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444539.
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Blomster, Anna. "Unga fotbollsspelaresrörelsekontroll, mätt med The Matrix Movement and Performance screen, före och efter 11 veckorsträningsintervention." Thesis, Linnéuniversitetet, Institutionen för pedagogik, psykologi och idrottsvetenskap, PPI, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-21855.
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Bakgrund: Evidens finns för att träning inriktad på neuromuskulär kontroll, styrka och medvetenhet kan minska antalet skador i nedre extremitet hos fotbollsspelare. Brister i rörelsekontroll skulle kunna predisponera för smärta, dysfunktion och skador och vara en orsak till skaderecidiv. Syfte: Att studera rörelsekontroll hos unga manliga fotbollsspelare före och efter en träningsintervention på elva veckor med särskilt fokus på ländrygg, bäcken och höftregion. Metod: Tjugo unga elitsatsande fotbollsspelare ingick i studien. Screeninginstrumentet The Matrix Movement and Performance Screen (MPS) användes för att mäta spelarnas rörelsekontroll före och efter en träningsintervention på 11 veckor. MPS identifierar okontrollerad rörelse vad avser lokalisation och riktning samt om den är relaterad till låg eller hög belastning. Träningen inriktades, utifrån testresultat vid baslinjen, på specifik motorisk kontroll träning av ländrygg, bäcken, höft och bröstrygg under låg och hög belastning och utfördes i form av hemövningar och av sjukgymnast övervakad cirkelträning. Resultat: Efter interventionen sågs en signifikant förbättring för MPS total poäng och uppdelat på högrisk områden vad avser rörelsekontroll på låg respektive hög belastning. Ett genomgående mönster av nedsatt rörelsekontroll vad avser ländrygg/bäcken och höft sågs hos spelarna vid testtillfälle ett och en genomgående förbättring av samma parametrar vid testtillfälle två. Konklusion: En träningsintervention på 11 veckor, baserad på testresultat från The Matrix Movement and Performance Screen, förbättrade deltagarnas rörelsekontroll signifikant.Introduction: Evidence exists that training focused on neuromuscular control, strength and awareness is effective in reducing the number of injuries in the lower extremity of soccer players. Deficits in movement control might predispose to pain, dysfunction and injury and be a cause of re-injury. Objective: To investigate movement control, with extra emphasis on low back, pelvis and hip region, in young male soccer players before and after a training intervention in eleven weeks. Method: Twenty young elite soccer players entered the study. The screening tool The Matrix Movement and Performance Screen (MPS) was used to measure the players' movement control before and after a training intervention of 11 weeks. MPS identifies the site and direction of uncontrolled movement and whether it´s related to low or high load. The training was based on the test results at baseline and focused on specific motor control training of the low back, pelvis, hip and upper back during low and high load and was conducted in the form of circuit training supervised by the test leader and home exercises. Results: There was a significant improvement for the MPS total scores and for high risk areas concerning movement control at low and high load respectively after the intervention. A pattern of uncontrolled movements in the lumbo-pelvic region and hip were seen at test occasion one of the players and an overall improvement of the same parameters were seen in test occasion two. Conclusion: A training intervention for 11 weeks, based on the test results from The Matrix Movement and Performance Screen, improved the players´ movement control significantly.
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Shamsudin, Roslinda. "Directed melt oxidation of ceramic matrix composites : the effect of oxide dopants and particulate reinforcements." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301283.
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Andersson, Emma. "Laborationers syfte och bedömning – ett exempel med bedömningsmatris." Thesis, Malmö högskola, Lärarutbildningen (LUT), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-29817.
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Avsikten med detta arbete är att ta reda på vad laborationer har för syfte enligt gymnasielärare, vad som bedöms samt hur bedömningen går till och hur den dokumenteras. Jag vill också försöka ta reda på hur eleverna ser på syftet med laborationer samt hur eleverna tror att de blir bedömda på dessa. Genom ett experiment med bedömningsmatris vill jag pröva möjligheterna att som lärare under själva laborationen genomföra en individuell bedömning av eleverna samt ta reda på om denna kan användas för att låta eleverna själva bedöma sin förmåga i samband med laborativt arbete. Jag har för att uppnå dessa syften använt mig utav kvalitativa intervjuer med lärare, enkäter till elever och gjort ett experiment genom att använda matris för bedömning under laborationstid. Jag har funnit att lärarnas syften och bedömning varierar dem emellan. Likaså gör deras elevers åsikter i frågor om detsamma. Eleverna anser sig bli bedömda på mer än vad lärarna verkligen bedömer. Lärarna använder laborationsrapporter som bedömningsunderlag, men bedömningen av dessa sker på olika sätt. Agerande och elevens muntliga framställning bedöms av lärarna, men dokumenteras inte pga. tidsbrist. Bedömningsmatriser kan fungera som underlag för bedömning av elevers laborativa färdigheter samt användas för elevers självbedömning.
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Al, Adhami Hala. "Identification d’un réseau de gènes soumis à empreinte génomique parentale et son rôle dans le contrôle des transitions entre prolifération, quiescence et différenciation." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20136.
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L'empreinte génomique parentale est un mécanisme de régulation épigénétique conduisant à la répression d'un allèle d'un gène en fonction de son origine parentale. Ce mécanisme affecte un nombre restreint de gènes chez les mammifères métathériens et euthériens. Ces gènes, dits gènes soumis à empreinte (GSE), ont des fonctions moléculaires variées et sans lien apparent. Cependant, deux thèmes reviennent de manière récurrente dans leurs fonctions: le contrôle de la croissance embryonnaire et la tumorigenèse. Ma thèse a consisté à démontrer l'existence d'un lien fonctionnel entre les GSE. Nous montrons que les GSE s'inscrivent dans un même réseau de co-expression transcriptionnelle et qu'ils sont co-régulés dans différentes situations biologiques lors des transitions entre les différents états cellulaires. En effet, une induction coordonnée de la plupart des GSE a lieu lors des sorties du cycle cellulaire, réversibles (quiescence) ou non (différenciation). Les perturbations individuelles de l'expression de plusieurs GSE dans le modèle des pré-adipocytes 3T3-L1 confirment un rôle du réseau des GSE dans le contrôle des transitions entre prolifération, quiescence et différenciation. De plus, l'analyse des gènes bi-alléliques inclus dans le même réseau de co-régulation que les GSE montre un enrichissement en gènes de la matrice extracellulaire. La fonction associée à ce réseau serait donc le contrôle des transitions entre les différents états cellulaires, via le remodelage de la matrice extracellulaire. Pour conclure, outre l'identification d'une fonction commune aux GSE, nos résultats suggèrent un scénario pour le ciblage de ces gènes par l'empreinte génomique parentale au cours de l'évolution des mammifèresGenomic imprinting is an epigenetic mechanism leading to the repression of one allele of a gene, depending on its parental origin. This mechanism affects a small number of genes in metatherian and eutherian mammals. These genes, named imprinted genes (IGs), display various molecular functions and thus seem unrelated. However, their alterations are frequently associated with the control of embryonic growth and tumorigenesis. My PhD project has consisted in demonstrating a functional link between IGs. We show that IGs are frequently co-expressed and belong to a common gene network. They are co-regulated in biological situations corresponding to the transitions between different cellular states. Coordinated induction of most IGs takes place at the outputs of the cell cycle. Loss and gain of function experiments of several IGs in the 3T3-L1 pre-adipocyte model demonstrate a role of the IG network in controlling transitions between cellular states (proliferation, quiescence and differentiation). In addition to IGs, this network also includes bi-allelic genes, with many extracellular matrix genes. Therefore, the function associated with the IG network could be the fine control of transitions between cellular states through a remodeling of the extracellular matrix.To conclude, in addition to the identification of a common cellular function for IGs, our results suggest a possible scenario for the targeting of these genes by parental genomic imprinting during mammalian evolution
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Lundström, Adam, Joakim Svantesson, Martin Uustalu, Robin Hamberg, and Viktor Kozma. "Indestructibot – Konstruktion av en robot med LED-matris, mikrofoner, servo- och stegmotorer." Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-184244.
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Detta projekt avhandlar konstruktion och bygge av en robot som en hyllning till den världskände svenska artisten Robyn. Målet med roboten är att den ska kunna vara med på en konsert med Robyn och interagera med henne och publiken. Robyn har visat sitt teknikintresse genom flera låttexter så en robot för att spegla detta vore en passande hyllning. Roboten är konstruerad i metall och har en 16x16 LED-matris där ett flertal bilder kan demonstreras, lysdioderna kan blinka i takt till musiken. Roboten är stillastående men kan rotera med hjälp av en stegmotor samt röra två armar med varsin servomotor. Alla applikationer styrs med en fjärrkontroll. Denna rapport följer vägen från idé till en färdig robot redo för en konsert.This thesis discusses the design and construction of a robot as a tribute to the world famous artist Robyn. The objective of the robot is to interact with Robyn and the audience. The robot is constructed by metal and has a 16x16 LED matrix. The LEDs can flash to the beat of the music. The robot can rotate the body with a stepper motor and move two arms with the help from two servo motors. A remote controller controls all the functions.
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Hewitt, Karen. "Battery operated men : : the role of women characters in The Matrix, The Fifth Element and Metropolis /." Title page, contents and introduction only, 2000. http://web4.library.adelaide.edu.au/theses/09AR/09arh6112.pdf.
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Wade, Mary E. "Engineering of Elastomeric Biomaterials and Biomimicry of Extracellular Matrix for Soft Tissue Regeneration." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1478000902817738.
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Wang, Shuo. "An Improved Meta-analysis for Analyzing Cylindrical-type Time Series Data with Applications to Forecasting Problem in Environmental Study." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-theses/386.
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This thesis provides a case study on how the wind direction plays an important role in the amount of rainfall, in the village of Somi$acute{o}$. The primary goal is to illustrate how a meta-analysis, together with circular data analytic methods, helps in analyzing certain environmental issues. The existing GLS meta-analysis combines the merits of usual meta-analysis that yields a better precision and also accounts for covariance among coefficients. But, it is quite limited since information about the covariance among coefficients is not utilized. Hence, in my proposed meta-analysis, I take the correlations between adjacent studies into account when employing the GLS meta-analysis. Besides, I also fit a time series linear-circular regression as a comparable model. By comparing the confidence intervals of parameter estimates, covariance matrix, AIC, BIC and p-values, I discuss an improvement on the GLS meta analysis model in its application to forecasting problem in Environmental study.
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Maass, Alexandra. "Digital Cityscapes in American Science Fiction: Physical Structure, Social Relationships, and Programmed Identities." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/theses/1124.
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Because cities act as the primary site for the development and production of new technologies, they arguably act as crossing points into the growing digital environment. As information technologies such as computers, digital networks, and most specifically the Internet become normalized within American culture, a need arises to examine the impact these technologies have on those who use them. Science fiction texts often explore technological influence on the human body, social relationships, and developing culture, and typically utilize cities as settings for this exploration. An examination of four primary science fiction texts, Philip K. Dick's Do Androids Dream of Electric Sheep?, William Gibson's Neuromancer, the Wachowskis' The Matrix, and M.T. Anderson's Feed, and the connections they draw between cities and cyberspace reveal not only an ongoing ambivalent relationship between humans and the technology they create, but also a concern for the growing power of that technology's influence. Louis Wirth's observations of the early twentieth century city serve as a guide in looking at digital cityscapes first as structural, then as social, and finally as points of direct influence on human identity within these texts, suggesting mirrored concerns not only within American culture, but the global digital culture that is forming as a result of the connectivity offered by digital information technologies.
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Boivie, Joakim. "Digital Wanderlust : Med digital materia som följeslagare i skapandet." Thesis, Blekinge Tekniska Högskola, Institutionen för teknik och estetik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-14703.
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Med detta kandidatarbete vill jag synliggöra datorns roll i digitalt skapande. Detta genom att se till den kod som utgör digitala objekt som ett materia, och utifrån Karen Barads teorier om agentiell realism samt forskning i digital materialitet bjuda in denna digitala materia som en aktör i skapandeprocessen. Jag har strävat efter en inblick i hur digital materia framträder när den tillåts verka som en aktör, hur den tar ett uttryck och yttrar sig. Jag har engagerat mig i digital materia med diffraktion och remix som metod, vilket tillåtit mig en djupare inblick i det samt en inkluderande process där jag och materiat verkar tillsammans; i intra-aktion. I slutändan ser jag hur digital materia inte framträder ensamt, både jag och dator finns sammantrasslade i dess framträdande som ett resultat av den intra-aktion vi mötts i. Mitt ingripande i digital materia blir synligt i form av glitches, spår av digitalt förfall som ger det annars flyktiga digitala materiat mer materiella och konkreta egenskaper. Det blir även tydligt hur digital materia innebär en svårförstådd komplexitet, som framträder visuellt när det tillåts påverka denna skapandeprocess. Men jag även erhållit en medvetenhet om hur digital materia inte har ett absolut framträdande, och mitt arbete kan ses som en undersökning i hur digital materia kan framträda.With this bachelor thesis I aim to bring to light the role of the computer in digital creative work. This is accomplished by treating the code that make up digital objects as a form of matter, and with Karen Barad’s agential realism and other research into digital materiality as a point of reference this matter is invited to the creative process as an actor. I’ve been striving for a glimpse of how digital matter comes to life when it’s allowed an active part in the creative process, to see how it expresses itself. By engaging with the digital matter through diffraction and remix as methods I’ve been given an insight into the core of it, and through the process I’ve been working alongside digital matter in intra action. Ultimately I can see how digital matter won’t appear alone, I myself and the computer are both entangled together with the digital matter as a result of the intra actions we’ve been engaging in. My intervention in digital matter becomes visible as glitches, traces of decay that give the digital matter, which can be so fleeting, more concrete and material characteristics. The unintelligible complexity of digital matter also comes to light when it’s allowed influence, as it appears visually. With this knowledge I’ve gained the awareness that digital matter does not have an absolute appearance, and this thesis can be seen as an investigation into how digital matter can appear.
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Weston, Tanya L. "Application of a job exposure matrix to assess cancer mortality risk in a cohort of working men." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22423.pdf.
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Formolo, Deise. "Uma hist?ria visual da luta pela terra : Porto Alegre, Pra?a da Matriz, 1990." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2018. http://tede2.pucrs.br/tede2/handle/tede/8097.
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Conselho Nacional de Pesquisa e Desenvolvimento Cient?fico e Tecnol?gico - CNPq
This research aimed to understand the construction of the visual memory of the event of the struggle for land that took place in Pra?a da Matriz, in the city of Porto Alegre, on August 8, 1990. To do so, we sought to build series based on the analysis and interpretation of how the event was constructed, given to see and conveyed by the major regional and national commercial press. In dialogue, a series of eighty-six photographs from different institutional and private collections, entitled SINDJORS series, were analyzed. The dissertation was structured in five chapters. The first chapter is configured in the introduction, where the theoretical basis of the dissertation is presented, based on the concepts of journalistic field (Bourdieu), visuals (Menezes), public photography (Mauad), memory (Candau) and survival (Didi-Huberman). In the second chapter, an immersion was carried out in the context of the construction of the photograph produced in Brazil between the 1960s and 1990s. Emphasis was placed on the professional career of photographers, whose production of images is linked to the land issue. This route was traced to the photographers of the SINDJORS series. Then, aspects of the historical course of the rural social movements in Rio Grande do Sul (Harres), (Eckert) were presented. It was analyzed how the construction of the photographic practices (Mauad) of these professionals, dedicated to the production of images on the question of land, is related, in some aspects, to the very construction of the struggle for land. In chapters three and four, considering the pressures of the market (economic capital) and political on the field of journalism, we identified some strategies adopted by the commercial communication vehicles to report the event, which can be summarized in these points: criminalize the MST act; disqualify the political action, directing the agenda for the death of the soldier Valdeci de Abreu and decontextualizing the history of the struggle for land; and construct the narratives from the idea of ?conflict?. Finally, it was observed that the idea of "confrontation" was present in the relationship between the photographs and the text published in the periodicals. The photographs published in the newspapers analyzed complain of a report of denunciation of police violence, in opposition to the text that tends to value the action of the military police. In chapter five, the series of images of SINDJORS was analyzed, identifying their patterns and survivals, as well as the editions of the labor union newspapers (SINJORS and Sindibanc?rios) and of the newspaper Sem Terra (MST). It was found that the discursive elaboration of the newspaper "Sem Terra? has similarities with the versions reported by the Jornal do SINDJORS and O Banc?rio. However, in "Sem Terra", there is an accentuation on the concern to insert the event of Pra?a da Matriz in the prism of the historical course of the struggle for land in Brazil, highlighting the violent scenario led by the governments to deal with the land issue. It can be said that the construction of the visual memories of the event are shaped by the dispute between the versions of the journalistic text, condensed in repetition and reproduction, and the visualities of photographs, based on the tension between resistance and repression, and in the survivals of images of other temporalities.
Esta pesquisa teve como objetivo compreender a constru??o da mem?ria visual do acontecimento da luta pela terra ocorrido na Pra?a da Matriz, na cidade de Porto Alegre, no dia oito de agosto de 1990. Para tal, buscou-se construir s?ries a partir da an?lise e interpreta??o de como o acontecimento foi constru?do, dado a ver e veiculado pela grande imprensa comercial regional e nacional. Em di?logo, analisou-se uma s?rie de oitenta e seis fotografias provenientes de diferentes acervos institucionais e privados, intitulada neste trabalho de s?rie do SINDJORS. A disserta??o foi estruturada em cinco cap?tulos. O primeiro cap?tulo configura-se na introdu??o, onde se apresenta a base te?rica da disserta??o, pautada pelos conceitos de campo jornal?stico (Bourdieu), visualidades (Maneses), fotografia p?blica (Mauad), mem?ria (Candau) e sobreviv?ncia (Didi-Huberman). No segundo cap?tulo, realizou-se uma imers?o no contexto de constru??o da fotografia produzida no Brasil entre as d?cadas de 1960 e 1990. Destacaram-se aspectos do percurso profissional de fot?grafos cuja produ??o de imagens se vincula ? quest?o da terra. Tra?ou-se esse percurso para os fot?grafos e fot?grafas da s?rie do SINDJORS. Em seguida, apresentaram-se aspectos do percurso hist?rico dos movimentos sociais rurais no Rio Grande do Sul (Harres), (Eckert). Analisou-se como a constru??o das pr?ticas fotogr?ficas (Mauad) desses profissionais, dedicados a produ??o de imagens sobre a quest?o da terra, relaciona-se, em alguns aspectos, com a pr?pria constru??o da luta pela terra. Nos cap?tulos tr?s e quatro, atentando-se para as press?es do mercado (capital econ?mico) e pol?tico sobre o campo jornal?stico, identificaram-se algumas estrat?gias adotadas pelos ve?culos de comunica??o comercial para noticiar o acontecimento, que podem ser resumidas nestes pontos: criminalizar o ato do MST; desqualificar a a??o pol?tica, direcionando a pauta para a morte do soldado Valdeci de Abreu, descontextualizando a hist?ria da luta pela terra; e produzir as narrativas a partir da ideia de ?confronto?. Por fim, observou-se que a ideia de ?confronto? se fez presente na rela??o entre as fotografias e os textos publicados nos peri?dicos. As fotografias publicadas nos jornais analisados reclamam uma mem?ria de den?ncia da viol?ncia policial, contrapondo-se ao texto, que tende a valorizar a a??o dos policiais militares. No cap?tulo cinco, analisou-se a s?rie de imagens do SINDJORS, identificando seus padr?es e sobreviv?ncias, bem como as edi??es dos jornais sindicais (SINJORS e Sindibanc?rios) e do jornal ?Sem Terra? (MST). Constatou-se que a elabora??o discursiva do jornal ?Sem Terra? apresenta semelhan?as com as vers?es noticiadas pelo Jornal do SINDJORS e O Banc?rio. Por?m, em ?Sem Terra?, percebeu-se uma acentua??o maior na preocupa??o em inserir o acontecimento da Pra?a da Matriz sob o prisma do percurso hist?rico da luta pela terra no Brasil, destacando o cen?rio violento capitaneado pelos governos em rela??o ? quest?o da terra. Pode-se dizer que a constru??o das mem?rias visuais do acontecimento molda-se na disputa entre as vers?es do texto jornal?stico, condensadas na repeti??o e reprodu??o, e as visualidades das fotografias, calcadas na tens?o entre resist?ncia e repress?o e nas sobreviv?ncias de imagens de outras temporalidades.
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Mathouraparsad, Sébastien. "Sur la modélisation et la préparation de la politique économique des régions ultrapériphériques d'Europe : le cas des Départements d'Outre-Mer." Thesis, Antilles-Guyane, 2011. http://www.theses.fr/2011AGUY0411/document.
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Dans le cas des DOM, singulièrement la Guadeloupe, qui sont à l'aube de l'expérimentation de réformes profondes de politiques économiques, l'élaboration d'un outil de simulation macroéconomique tel qu'un MEGC apparaît naturellement comme une exigence plus que souhaitable. Ce recours à la construction de modèles spécifiques pour les DOM est en parfaite cohérence avec l'une des principales conclusions du rapport d'information diligenté par le Sénat aux lendemains de la crise sociale du début de l'année 2009. Les appels à projet de la Commission europèenne et du Ministère de l'Outre-mer vont justement dans le sens de pallier celte carence puisque la politique économique des RUP de façon générale est conduite à vue sans aucun outil d'investigation ex ante. Nous avons conçu plusieurs modèles. Parmi eux, CloDyn est le premier modèle macroéconomique pour les DOM à vocationopérationnelle. Composée de plus de 2000 équations, ce modèle d'équilibre général calculable tient compte de nombreuses rigidités sur les marchés des biens et services et du travail et se décline sous deux versions: statique et dynamique. Les élasticités ont fait l'objet d'estimations économétriques. Il tient compte de nombreuses spécificités tant au niveau de la fiscalité de ces régions (octroi de mer, taxe sur les carburants, subventions à l'exportation) que du coût des facteurs (exonérations des charges sur les bas salaires, sur rémunératio des fonctionnaires). Il repose sur une formalisation des mécanismes en oeuvre dans ces économies que nous avons appelé le DOM disease pour expliquer les dysfonctionnements persistants sur le plan macroéconomiqueIn the case of the French overseas regions, particularly of Guadeloupe, which are just beginning to experiment with economic policies radical reforrns, the development of a macroeconomic simulation tool such as a CGE model appears naturally as a highly desirable requirement. The use of the construction of specifie models for DOM is fully consistent with a major finding of the report commissioned by the Senate in the aftermath of the social crisis of the early 2009. As a malter of facts, the purpose of the calls for project initiated by the European Commission and the Ministry of Overseas is to remedy this deficiency, since the RUP economie policy is generally to conduct no investigation tool ex ante. We designed several models. Among them, CloDyn is the first operational DOM-based macroeconomic rnodel. Composed of more than 2000 equations, this computable general equilibrium model takes into account many rigidities in the markets for goods and services and labor and is available in two versions: static and dynamic. Elasticities have been econometrically estimated. lt rests on many features of both taxation (dock dues, fuel tax, export subsidies) and the cost factors (exemption from charges on low wages, remuneration of civil servants). Il is based on a formalization of the mechanisms at work in these economies we calied the DOM disease to explain the persistent failures in such economies. lt also evaluates the monetary poverty among households with the use of a block of microsimulation model and we allow a profane in GAMS to use this tool and conduct its own analytical work thanks to a user friendly interface
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Silva, J?nior Jos? Ferreira da. "Comportamento da adi??o do carbeto de ni?bio (nBC) na matriz met?lica do a?o ferr?tico 15kH2mfa." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12804.
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Previous issue date: 2012-11-01Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
The 15Kh2MFA steel is a kind of Cr-Mo-V family steels and can be used in turbines for energy generation, pressure vessels, nuclear reactors or applications where the range of temperature that the material works is between 250 to 450?C. To improve the properties of these steels increasing the service temperature and the thermal stability is add a second particle phase. These particles can be oxides, carbides, nitrites or even solid solution of some chemical elements. On this way, this work aim to study the effect of addition of 3wt% of niobium carbide in the metallic matrix of 15Kh2MFA steel. Powder metallurgy was the route employed to produce this metallic matrix composite. Two different milling conditions were performed. Condition 1: milling of pure 15Kh2MFA steel and condition 2: milling of 15Kh2MFA steel with addition of niobium carbide. A high energy milling was carried out during 5 hours. Then, these two powders were sintered in a vacuum furnace (10-4torr) at 1150 and 1250?C during 60 minutes. After sintering the samples were normalized at 950?C per 3 minutes followed by air cooling to obtain a desired microstructure. Results show that the addition of niobium carbide helps to mill faster the particles during the milling when compared with that steel without carbide. At the sintering, the niobium carbide helps to sinter increasing the density of the samples reaching a maximum density of 7.86g/cm?, better than the melted steel as received that was 7,81g/cm?. In spite this good densification, after normalizing, the niobium carbide don t contributed to increase the microhardness. The best microhardness obtained to the steel with niobium carbide was 156HV and to pure 15Kh2MFA steel was 212HV. It happened due when the niobium carbide is added to the steel a pearlitic structure was formed, and the steel without niobium carbide submitted to the same conditions reached a bainitic structure
O a?o 15Kh2MFA, da fam?lia dos a?os CrMoV, pode ser utilizado em turbinas para gera??o de energia, vasos de press?o, reatores nuclear ou aplica??es, onde o material ? submetido a temperaturas de servi?o entre 250 e 450?C. Uma forma de melhorar as propriedades do a?o, para que ele trabalhe a temperaturas mais altas ou que se torne mais est?vel ? adicionar part?culas de segunda fase na sua matriz. Estas part?culas podem estar na forma de ?xidos, carbetos, nitretos ou at? mesmo em solu??o s?lida quando alguns elementos qu?micos s?o adicionados ao material. Neste contexto, este trabalho objetiva estudar o efeito da adi??o de 3% de carbeto de ni?bio na matriz met?lica do a?o 15Kh2MFA. Para isto a metalurgia do p? foi a rota empregada para a produ??o deste comp?sito de matriz met?lica. Para tal, duas moagens distintas foram realizadas. A primeira com o a?o 15Kh2MFA e a segunda com o a?o 15Kh2MFA com adi??o de 3% de carbeto de ni?bio. A moagem de alta energia foi realizada durante 5 horas. Em seguida, os dois p?s produzidos foram sinterizados em um forno a v?cuo (10-4torr) a temperaturas de 1150?C e 1250?C durante 60 minutos. Ap?s a sinteriza??o as amostras foram submetidas ao tratamento t?rmico de normaliza??o a 950?C. Os resultados mostraram que a adi??o do carbeto de ni?bio ajuda o processo de cominui??o das part?culas, quando comparado com o a?o sem o carbeto de ni?bio. O carbeto de ni?bio tem um papel fundamental na densifica??o das amostras durante a sinteriza??o, levando a densidade 7,86g/cm?, que ? maior do que a densidade do a?o fundido recebido que era de 7,81g/cm?. Apesar desta boa densifica??o, ap?s a normaliza??o, o NbC n?o contribuiu de forma significativa para aumento da dureza, onde a melhor dureza obtida para o a?o com NbC foi de 156HV e para o a?o puro foi de 212HV. Isto se deve ao fato de que, quando o NbC foi adicionado ao a?o, formou-se uma estrutura perl?tica, enquanto que, com o a?o sem adi??o de NbC, submetido as mesmas condi??es, obteve-se uma estrutura bain?tica
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Souza, Jos? Leonaldo de. "Efeito da moagem de alta energia sobre a densifica??o e microestrutura do sistema Al2O3-Co de matriz met?lica." PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, 2016. https://repositorio.ufrn.br/jspui/handle/123456789/23549.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
Os materiais cer?micos, tais como a alumina (Al2O3) e o cobalto (Co), apresentam caracteristicas relevantes para aplica??o como ferramentas de corte, e dentre estas se destacam a elevada dureza e o alto ponto de fus?o. No entanto, a sua aplica??o ? limitada pela sua baixa tenacidade e baixa resist?ncia mec?nica. Desta forma, a fim de aumentar a tenacidade do material, mantendo-se as elevadas propriedades mec?nicas, alguns metais, como por exemplo, o cobalto (Co), t?m sido usados na tentativa de se produzir um material mais tenaz. Neste trabalho, estudouse o efeito da moagem de alta energia e da adi??o de (%p.) Co na densifica??o e microestrutura, assim como, nas propriedades mec?nicas do composto Al2O3-Co. Os p?s-particulados (Al2O3 e Co), com percentuais de 5 e 20%p. de cobalto, foram mo?dos em um moinho planet?rio durante 50 horas, e amostras de p?s foram coletadas nos intervalos de 2, 10, 15, 20, 30,40 e 50 horas. Os p?s mo?dos foram caracterizados por difra??o de raios-X (DRX), an?lises particulom?tricas, microscopia eletr?nica de varredura (MEV); e compactados em uma matriz cil?ndrica sob uma press?o uniaxial de 100 MPa. Posteriormente, os compactados a verde foram sinterizados em um forno resistivo nas temperaturas de 1200 a 1500 ?C, por 60 minutos, sob uma atmosfera de arg?nio com taxa de aquecimento de 10?C/min. Os corpos de prova sinterizados foram caracterizados por DRX, MEV e energia dispersiva (EDS). A densidade foi medida usando o m?todo geom?trico (massa/volume), e os melhores valores foram obtidos para as amostras sinterizadas a temperatura de 1500 ?C, sendo a densidade relativa igual a 78 %, seguido das sinterizadas a temperaturas de 1350?C e 1300?C, que apresentaram as respectivas densidades 68 %, e 62 %.
Ceramic materials, such as alumina (Al2O3) and cobalt (Co), present characteristics like high hardness and the high melting point for application as cutting tools. However, its application is limited because of its low toughness and low mechanical strength. Thus, in order to increase the toughness and maintaining the high mechanical properties, some metals such as cobalt (Co) have been used. In this work, the effect of the high energy milling and different amount of Co on densification, microstructure and mechanical properties of the Al2O3-Co compound were studied. The particulate powders (Al2O3 and Co), with 5 and 20 wt% of cobalt, were milled in a planetary milling for 50 hours, and powder mixture samples were collected at the intervals of 2, 10, 15, 20, 30, 40 and 50 hours. The milled powders were characterized by X-ray diffraction (XRD), particulometric analyzes, scanning electron microscopy (SEM); And compacted in a cylindrical matrix under a uniaxial pressure of 100 MPa. Subsequently, green compacts were sintered in a resistance furnace at 1200 to 1500 ?C with holding time of 60 minutes under an argon atmosphere with a heating rate of 10 ?C/min. The sintered samples were characterized by XRD, SEM and EDS. Density was measured using the geometric method (mass/volume), and the best values were obtained for the samples sintered at 1500 ?C with relative density of 78% compared with sample sintering at 1350 and 1300 ?C which presented relative densities of 68% and 62% respectively.
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Anthony, Sammy Lourdson. "ÄR MATRISER ETT UNDERSKATTAT VERKTYG I ARBETET MED ATT SÄKERSTÄLLA LÄROPLANENS INTENSIONER I UNDERVISNINGEN PÅ GYMNASIETS YREKSINRIKTADE PROGRAM?" Thesis, Halmstad University, School of Teacher Education (LUT), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-5343.
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Detta examensarbete handlar i allt väsentlig om attityder och strukturer i undervisningen på gymnasiets yrkesförberedande linjer med speciell fokusering på Hotell- & Restaurang- programmet. Framför allt har tonvikten i undersökningen lagts på yrkeslärarnas attityder till arbetet med matriser och olika bedömningar utifrån dessa, speciellt i relation till den nu gällande läroplanen Gy 2000 och den förestående läroplanen Gy 2011, under förutsättning av att den sistnämnda kommer att godkännas av Riksdag och Regering.
Undersökningen genomfördes i enkätform med diverse frågor till 15 yrkeslärare, alla aktiva inom gymnasiets Hotell- och Restaurang – program. Så gott som samtliga yrkeslärare hade lång erfarenhet som kock och kocklärare och de representerade 5 olika gymnasier. Det blev inget externt eller internt bortfall under undersökningens gång.
Skolverket gav år 2000 ut ett Hotell- och Restaurangprogram med programmål, kursplaner, betygskriterier och rekommendationer (HR 2000:09). Ett av undersökningens syfte var att medels enkäten ta reda på om nämnde program idag används enligt Skolverkets intentioner. Ett annat om programmet är så utformad att det är lätt att förstå och använda och ett tredje om det finns en obligatorisk kurslitteratur att luta sig emot och om det finns behov för det. Kan matriser spela någon roll i detta sammanhang?
Ett litteraturgenom visade att mycket lite forskning gjorts kring användandet av matriser i gymnasieskolan och på det yrkesförberedande programmet i synnerhet. Detta gäller såväl matriser för att strukturera grunderna i utbildningen som användandet av bedömningsmatriser vid betygssättning och dylikt.
En rad olika bedömningsteorier och bedömningsformer finns att tillgå. Flera av dessa beskrivs och exempel ges på deras användning. Skolverket har i rundskriv och förordningar det senaste decenniet efterlyst en skärpning vid bedömning av elevernas prestationer och givet direktiv för hur problemet kan angripas. Bland annat påpekas förordningen från 2008 som påbjuder bedömningsprotokoller vilket innebär en skriftlig dokumentation av elevernas prestationer. Bedömningsmatriser nämns som ett möjligt verktyg i detta sammanhang.
Begreppet matriser belyses och exempel ges på byggandet och användning av matriser i undervisningen.
Undersökningen utfördes i form av en enkät med en titelfråga och två huvudfrågor med följdfrågor, totalt 10 frågor som alla besvarades av de 15 yrkeslärarna. Endast ett fåtal följdfrågor förblev obesvarade. Titelfrågan handlade om bedömningsmatriser som ett eventuellt underskattat verktyg för att säkerställa läroplanens intentioner. Den första huvudfrågan handlade om yrkeslärarnas attityd till skriftlig dokumentation av elevernas prestationer. Den andra huvudfrågan handlade om yrkeslärarnas attityd till matriser som verktyg till att strukturera och säkerställa att vissa minimum krav i undervisningen uppfylls. Enkätsvaren med kommentarer beskrivs. Svaren på titelfrågan såväl som de två huvudfrågorna med följdfrågor pekar i riktning av att matriser är ett underskattat verktyg i undervisningsarbetet på det yrkesförberedande H & R programmet. Svaren visar vidare att det finns ett behov för strukturerade undervisningsplaner, ny kurslitteratur och samordning av lärarresurserna i den lokala skolmiljön.
Ett framtida forskningsområde för matriser på gymnasienivå skisseras.
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Lillis, Wanda T. "Correlations of the differential ability scales with the Matrix Analogies Test and the Draw a Person : a quantitative scoring system /." Connect to this title online, 1987. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1107353171.
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Kütemeyer, Marius [Verfasser], and D. [Akademischer Betreuer] Koch. "Development of Ultra High Temperature Matrix Composites using a Reactive Melt Infiltration Process / Marius Kütemeyer ; Betreuer: D. Koch." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1230475699/34.
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Torstensson, Maja, and Elin Vinblad. "Intervention med responsiva talakter inom AKK hos två deltagare med cerebral pares i Tanzania : en single subject design-studie." Thesis, Linköpings universitet, Institutionen för klinisk och experimentell medicin, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78991.
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I många utvecklingsländer finns en begränsad tillgång på utvecklade AKK-system (Alant, 1999) och ofta även en okunskap kring möjligheterna att arbeta med kommunikationsproblem (Marshall, 1997). I föreliggande studie genomförs intervention i alternativ och kompletterande kommunikation (AKK) för två deltagare med cerebral pares på ett dagcenter i Kilimanjaroregionen, Tanzania. Syftet i föreliggande interventionsstudie är att genom intervention studera och utveckla de i mätsituationerna responsiva talakterna att påkalla uppmärksamhet för att inleda interaktion, acceptera och avfärda samt upprätthålla och avsluta interaktion. Detta sker med hjälp av begreppen ja och nej för att acceptera och avfärda, liksom mer och mindre för att upprätthålla och avsluta interaktion. Studien följer en single subjekt design och insatsen utgörs av två interventionsperioder, bestående av direkt intervention med deltagarna samt utbildning och fortlöpande handledning av personal. Resultaten visar att deltagarna i varierande grad lärde sig att påkalla uppmärksamhet för att inleda interaktion, acceptera och avfärda samt upprätthålla och avsluta interaktion. Det observerades även att deltagarna i högre grad utförde performativa talakter utanför den styrda testsituationen. Områden som vidare diskuteras är bland annat deltagarnas kommunikativa handlingar utifrån The Communication Matrix där en utveckling från prelingvistiska uttrycksätt till användandet av abstrakta symboler synliggjordes hos deltagarna.In several developing countries there are a limited supply of developed AAC systems (Alant, 1999) whereas a lack of knowledge about the possibilities of working with communication problems (Marshall, 1997). The present study is an intervention study about the introduction of augmentative and alternative communication (AAC) for two participants with cerebral palsy at a day-care centre in the Kilimanjaro Region, Tanzania. The purpose of the intervention study was to develop responsive speech acts to attract attention to initiate interaction, accept and reject interaction, as well as maintain and terminate interaction. This was done using the terms yes and no to accept and reject, and more and less to continue and terminate interaction. The study followed a single subject design consisting of two intervention periods, where direct intervention with the participants and continuing training and guidance for the staff occurred. The results show that the participants in varying degrees, has learned to attract attention to initiate interaction, accept and reject interaction as well as to maintain and terminate interaction. It was also observed that the participants learned to use the performative speech acts outside the controlled test situation. An area further discussed is the participants’ communicative acts as shown in The Communication Matrix, which displayed a development from pre linguistic models of expression to use the abstract symbols.
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Coelho, Renan S?vio de Almeida. "Influ?ncia da moagem de alta energia e adi??o de Nb na densifica??o e microestrutura de um comp?sito WC-Cu." PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/24841.
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As propriedades ?nicas do comp?sito de matriz met?lica de cobre (Cu) refor?ada por dispers?o de part?culas de carboneto de tungst?nio (WC) s?o de grande import?ncia para v?rias aplica??es industriais, devido a sua excelente resist?ncia sob alta temperatura, boa resist?ncia ? corros?o e ? fratura. O comp?sito Cu-WC ? quimicamente e termicamente est?vel, al?m de possuir excelentes propriedades de condutividade t?rmica e el?trica. Tais caracter?sticas o tornam um promissor material para fabrica??o de contato el?trico de alta pot?ncia, eletrodos para soldagem, condutores de campo magn?tico pulsado, dispositivos de gerenciamento t?rmico e el?trico. Este trabalho investiga o efeito da moagem de alta energia na densifica??o e microestrutura dos comp?sitos WC-20%Cu e WC-18%Cu-2%Nb, bem como a influ?ncia da adi??o do ni?bio como inibidor de crescimento de gr?o. O efeito da press?o de compacta??o e da temperatura de sinteriza??o dos p?s preparados por moagem e mistura mec?nica na densidade tamb?m foram estudados. P?s de WC, Cu e Nb, na raz?o de 80, 20 e 2 por cento em massa, respectivamente, foram preparados por moagem e, tamb?m, por mistura mec?nica. A moagem dos p?s comp?sitos foi realizada a seco sob atmosfera ambiente com um recipiente e bolas de metal duro em um moinho attritor. Os p?s foram mo?dos a 900 rpm durante 90 minutos e sob uma raz?o de massa p? para bolas de 1:100. Compactos de p?s com forma cil?ndricas foram prensados a 200, 400 e 600 MPa em uma matriz de a?o uniaxial de 8 mm de di?metro. Os corpos verdes foram sinterizados nas temperaturas de 1030 ?C e 1150 ?C por 60 min. em forno tubular resistivo sob atmosfera de nitrog?nio. A microestrutura dos corpos sinterizados foi analisada por microscopia eletr?nica de varredura. Para analisar a presen?a de impurezas nos p?s elementares e mo?dos, an?lises qu?micas de FRX e EDS foram realizadas. A an?lise de DRX foi usada para detectar as fases presentes. Uma significativa diminui??o dos cristalinos e amorfiza??o das fases Cu e WC foi exibida pelos p?s mo?dos. Assim como, um menor tamanho de gr?o foi alcan?ado pelas microestruturas sinterizadas dos p?s comp?sitos Cu-WC com adi??o de Nb. Os compactos de p?s submetidos a maior press?o de compacta??o e temperatura de sinteriza??o tamb?m alcan?aram as maiores densifica??es.
The unique properties of copper metal matrix composite reinforced by dispersion tungsten carbide particles (WC) are of great importance for several industrial applications, due to their excellent high temperature strength and good corrosion and fracture resistance. This composite is chemically and thermally very stable at high temperatures, as well as having excellent thermal and electrical conductivity properties. These promising features make for the manufacture of high-power electrical contact parts, welding electrodes, magnetic field conductors, thermal and electrical management devices. This work investigates the effect of high energy milling on the densification and microstructure of the composites WC-20% Cu and WC-18% Cu-2% Nb as well as an influence of the addition of niobium as a grain growth inhibitor. The effect of the compacting pressure and the sintering temperature of the powders prepared by milling and mechanical mixing in the density were also studied. WC, Cu and Nb powders in the ratio of 80, 20 and 2 percent by mass, respectively, were prepared by milling and also mechanical mixing. The powder mixture were mechanically alloyed in a attritor ball mil in a dry environment. The powders were milled at 900 rpm, with a mass to powder ratio of 1: 100 balls for 1.5 hours, and pressed at 200, 400 and 600 MPa in a uniaxial matrix with 8mm diameter. The green bodies were sintered at temperatures of 1030 ?C and 1150 ? C for 60 min in a resistive tubular oven under a nitrogen atmosphere. A microstructure of sintered bodies for analysis by scanning electron microscopy. To analyze a presence of impurities in the initial powder and the as-milled powders, chemical analyzes of XRF and EDS were performed. A XRD analysis was used to detect as structure of crystalline. Amortization of the Cu and WC phases occurred, with a decrease in the crystalline phase due to milling, and inhibition of grain growth, both at temperatures, in the samples with Nb. Higher compaction pressure and higher sintering temperature show better results for densification of the material.
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Fernandes, Maria Roseane de Pontes. "Comp?sitos de matriz met?lica ? base n?quel com adi??o de TaC e NbC produzidos via metalurgia do p?" Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12857.
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Previous issue date: 2014-01-24Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior
Carbide reinforced metallic alloys potentially improve some important mechanical properties required for the overall use of important engineering materials such as steel and nickel. Nevertheless, improved performance is achieved not only by composition enhancement but also by adequate processing techniques, such as novel sintering methods in the case of powder metallurgy. The method minimizes energy losses in addition to providing uniform heating during sintering. Thus, the general objective of this study was to evaluate the density, hardness, flexural strength, dilatometric behavior and to analyze the microstructure of metal matrix composites based nickel with addition of carbides of tantalum and / or niobium when sintered in a conventional furnace and Plasma assisted debinding and sintering (PADS). Initially, were defineds best parameters of granulation, screening and mixing procedure. After, mixtures of carbonyl Ni and 5%, 10% and 15 wt.% NbC and TaC were prepared in a Y-type mixer under wet conditions during 60 minutes. The mixtures were then dried and granulated using 1.5 wt. % paraffin diluted in hexane. Granulates were cold pressed under 600 MPa. Paraffin was then removed from the pressed pellets during a pre-sintering process carried out in a tubular furnace at 500 ?C during 30 min. The heating rate was 3 ?C/min. The pellets were then sintered using either a plasma assisted reactor or a conventional resistive tubular furnace. For both methods, the heating rate was set to 8 ?C/min up to 1150 ?C. The holding time was 60 minutes. The microstructure of the sintered samples was evaluated by SEM. Brinell hardness tests were also carried out. The results revealed that higher density and higher hardness values were observed in the plasma-assisted sintered samples. Hardness increased with the concentration of carbides in the Ni-matrix. The flexural strength also increased by adding the carbides. The decline was larger for the sample with addition of 5% 5% TaC and NbC. In general, compositions containing added carbide 10% showed less porous and more uniform distribution of carbides in the nickel matrix microstructural appearance. Thus, both added carbide and plasma sintering improved density, hardness, flexural strength and microstructural appearance of the composites
Ligas met?licas refor?adas por carbetos melhoram potencialmente algumas propriedades mec?nicas necess?rias para a utiliza??o de importantes materiais de engenharia, tais como o a?o e o n?quel. No entanto, o desempenho ? conseguido n?o apenas pela melhoria de composi??o, mas tamb?m por t?cnicas de processamento adequadas, tais como, novos m?todos de sinteriza??o, no caso da metalurgia do p?. Desta forma, o objetivo do presente trabalho foi avaliar a dureza, resist?ncia ? flex?o, comportamento dilatom?trico e analisar a microestrutura de comp?sitos de matriz met?lica base n?quel com adi??o de carbetos de t?ntalo e/ou ni?bio quando sinterizados em forno tubular convencional e Plasma assisted debinding sintering (PADS). Os carbetos (5%, 10% e 15% em massa) foram misturados ao p? de n?quel carbonila via ?mido com aux?lio do misturador Y adaptado durante 1h. Ap?s secagem, as misturas foram submetidas ao processo denominado de granula??o em tambor. Utilizou-se 1,5% de parafina (% massa) dilu?da em hexano. Os p?s granulados foram compactados a frio utilizando press?o de 600 MPa. Antes da sinteriza??o a uma taxa de 8 ?C/min com patamar 1h na temperatura de 1150?C tanto em forno tubular quanto em reator PADS, as amostras foram pr?-sinterizadas em forno tubular para extra??o da parafina a uma taxa de 3 ?C/min com patamar 30 min em 500 ?C. A dureza avaliada foi a Brinell e a an?lise microestrutural por MEV. Os resultados mostraram que as amostras sinterizadas assistidas por plasma apresentaram dureza superior ?quelas sinterizadas em forno convencional. As imagens por MEV comprovaram esses maiores valores de durezas, uma vez que a matriz apresentou-se mais densificada. Com rela??o ? adi??o dos carbetos, a dureza aumentou com o aumento da concentra??o dos mesmos. A resist?ncia ? flex?o tamb?m aumentou ao adicionar os carbetos. A retra??o foi maior para a amostra com adi??o de 5% de TaC e 5% NbC. De maneira geral, as composi??es com adi??o de 10% de carbetos apresentaram um aspecto microestrutural menos poroso e com uma distribui??o mais uniforme dos mesmos na matriz de n?quel. Assim, tanto a adi??o de carbetos quanto a sinteriza??o com aux?lio do plasma melhoraram a dureza e o aspecto microestrutural dos comp?sitos