Dissertations / Theses on the topic 'WHC 100'
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Butkevich, Eugenia. "Submembrane cytoskeleton-regulated assembly and functional activity of gap junctions." Doctoral thesis, [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972736174.
Full textZilly, Felipe Emilio. "Fluoreszenzmikroskopische Studien an Plasmamembranen zur Untersuchung der molekularen Mechanismen der neuronalen Exocytose." Doctoral thesis, [S.l.] : [s.n.], 2006. http://webdoc.sub.gwdg.de/diss/2006/zilly.
Full textFelappi, Giulia. "Sententialism : why not?" Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/sententialism-why-not(5584782c-94d8-45c5-aafd-be158f73838c).html.
Full textGregory, Alex. "Why do people do things?" Thesis, University of Reading, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542261.
Full textKatzav, Joel Kaduri. "Why do things happen more than once?" Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625056.
Full textMitova, Velislava Atanasova. "Doxastic accountability : why we accept epistemic norms and how to be responsible believers." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612798.
Full textFranco, Alexandre Luís. "Análise do padrão W3C / XForms 1.0." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2004. http://hdl.handle.net/10183/3722.
Full textGrimaldi, Cleo. "Why Not Penal Torture?" Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/philosophy_theses/105.
Full textHooker, Brad. "Why should I be moral?" Thesis, University of Oxford, 1986. http://ora.ox.ac.uk/objects/uuid:2b44fe6f-39b7-4d16-9b5c-8d8eb7251323.
Full textTaruffi, Liila [Verfasser]. "Why We Listen to Sad Music: Effects on Emotion and Cognition / Liila Taruffi." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1137509910/34.
Full textAgan, Jimmy. ""Like the one who serves" : Jesus, servant-likeness and self-humiliation in the Gospel of Luke." Thesis, University of Aberdeen, 1999. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=179543.
Full textSolomon, Benjamin M. "Who Cycles Into Our Valley." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/english_theses/130.
Full textDavis, Paul. "The cheap tricks of compatibilism and why the problem of free will won't go away." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/18821.
Full textHenriksson, Camilla, and Åsa Karlsson. "Kan man räkna till 100, kan man mycket : Barns tankar, funderingar och förståelse kring matematik." Thesis, University of Skövde, School of Humanities and Informatics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-4360.
Full textThis study was designed to describe and understand how children perceive and explain mathematical situations. During our work based training we have met several students who have been insecure in the subject of mathematics and therefore come to think that it's difficult and boring. The questions we have asked ourselves are why and how this insecurity occurs. In preschools around the country teachers actively worked to create opportunities for children to meet and discover mathematics. The question is whether the teachers are aware of how children perceive mathematics and how children think in mathematical situations.
We chose to conduct a qualitative study using different methods of data collecting in order to approach the children's world. We have used interviews, observations, experimental circle times and drawings. This study assumes a child’s perspective, because we want to understand their thoughts and perceptions about mathematics. The starting point is the didactic questions what, how and why.
The result of our study indicates that children in preschool perceive mathematics in different ways and that they are unaware that they actually can use and understand athematical situations in the specific context that is preschool.
Studiens syfte var att beskriva och förstå hur barn uppfattar och beskriver matematiska situationer. Vi har under vår verksamhetsförlagda utbildning mött flera elever som har varit osäkra inom matematik och där med tyckt att ämnet är svårt och tråkigt. Vi ställer oss då frågan varför det är så och hur detta tänkesätt uppstår. I förskolan runt om i landet arbetas det aktivt för att skapa möjligheter för barnen att få möta och upptäcka matematik. Frågan är om lärarna är medvetna om hur barn uppfattar matematik och hur barnen tänker kring matematiska situationer.
Vi valde att göra en kvalitativ studie och med hjälp av olika datainsamlingsmetoder närma oss barnens värld. Vi har använt oss av intervjuer, observation, experimentella samlingar och teckningar. Studien utgår ifrån barns perspektiv, då vi vill få förståelse för deras uppfattningar och beskrivningar inom matematik. Utgångspunkten har varit de didaktiska frågeställningarna Vad, Hur och Varför.
Resultatet i vår studie visar att barn i förskolan dagligen använder matematik i verksamheten, men de är omedvetna om att de faktiskt kan, använder och förstår matematiska situationer i den specifika kontexten som är förskola.
Hohenthal, Heather L. (Heather Lynn) 1967. "Who is financing development and how? : a survey of the 100 largest projects in the U.S." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/67162.
Full textIncludes bibliographical references (leaves 70-71).
In response to huge losses incurred from real estate investments, private capital withdrew from the market in the early 1990's, creating severe illiquidity. Wall Street, recognizing this lack of capital presented a potential arbitrage opportunity, began to issue public debt and equity securities to finance real estate. Many believe that this introduction of the public market to real estate will impose increased discipline on the suppliers of capital; potentially reducing the probability of overbuilding. The purpose of this paper is to briefly discuss the causes of past real estate cycles and, based on a survey of current construction financing activity, to comment on the current trends in the credit markets. The primary research for this paper, the construction financing survey, was designed to provide, from the perspective of the real estate developer, a snapshot of the loan terms currently being offered in the market. The owners of each of one hundred of the largest retail, office, multifamily, hotel and mixed-use development projects in the U.S. were contacted and questioned regarding their recent experience in securing both construction and permanent financing. The results of the study were interpreted to determine the dominant suppliers of construction and permanent financing and the level of discipline being exhibited by the credit market in general. Of particular interest was the availability and pricing of capital to fund new construction, current underwriting practices and ultimate exit strategy of the developer. The results of the study confirm that heightened competition between a wide variety of capital market participants has resulted in favorable pricing, an elimination or significant reduction in pre-leasing, equity and guaranty requirements and an overwhelming absence of takeout financing. Furthermore, despite the recent decline in stock prices and acquisition activity, developers continue to rely on REITs to provide an exit strategy for new development. Therefore, the strength of capital market and the eternal optimism being exhibited on the part of developers and lenders seems to suggest a growing potential for future oversupply.
by Heather L. Hohenthal.
S.M.
Nahemiah, T. L. Yee. "'You who were called the uncircumcision by the circumcision' : a study of Jewish attitudes toward the gentiles and ethnic reconciliation according to Eph. 2.1-22." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4315/.
Full textRead, Daniel. "WHY WE SING ALONG: MEASURABLE TRAITS OF SUCCESSFUL CONGREGATIONAL SONGS." UKnowledge, 2017. https://uknowledge.uky.edu/music_etds/102.
Full textHoffman, Melanie D. "The Impact of Canine Companion Service Animal (CSA) Use on Social Behaviors Between Individuals with Autism Spectrum Disorders Who Use CSA and Those Who Do Not." ScholarWorks, 2011. https://scholarworks.waldenu.edu/dissertations/1000.
Full textKeith, Karin. "Why Teach: Presentation to Future Teachers of America Club." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/1004.
Full textHubbeling, Tess. "It's Worse Than We Think: Why It Matters That We Underestimate Depression." Scholarship @ Claremont, 2015. http://scholarship.claremont.edu/cmc_theses/1001.
Full textSheek, James L. "Rural students, aspirations, motivation, and music education why don't more rural students make it to college? /." Greensboro, N.C. : University of North Carolina at Greensboro, 2007. http://libres.uncg.edu/edocs/etd/1400/umi-uncg-1400.pdf.
Full textTitle from PDF t.p. (viewed Oct. 22, 2007). Directed by Carl Lashley; submitted to the School of Education. Includes bibliographical references (p. 153-159).
Kim, MyungJoo. "Consumers' choice of dentist: how and why people choose dental school faculty as their oral care provider." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/1000.
Full textLucas, J. "Mindful life or mindful lives? : exploring why the Buddhist belief in rebirth should be taken seriously by mindfulness practitioners." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/35229.
Full textChen, Hai Dubo. "The Influence of Direct-to-Consumer Advertising: Who Will Talk to Their Doctor as A Result of Prescription Drug Advertisement?" VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/1300.
Full textTry, David Richard. "Using public value theory to assist in understanding how and why executives integrate results-based management exploratory case studies of the Canadian federal public sector /." Thesis, [Coventry, UK : D.R. Try], 2006. http://epe.lac-bac.gc.ca/100/200/300/david_richard_try/TryPhdThesis_FinalJune2006.pdf.
Full textPion-Klockner, Nikita. "From consciousness to action are there common identifiable life experiences among people who actively organize against oppression? : a project based on qualitative research /." Click here for text online. Smith College School for Social Work website, 2007. http://hdl.handle.net/10090/1007.
Full textThesis submitted in partial fulfillment for the degree of Master of Social Work. Includes bibliographical references (leaves 126-132).
Eriksson, Louise. "Why begin when you can commence - Aspects of near-synonymous verbs of Germanic and Romance origin." Thesis, Växjö University, School of Humanities, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1030.
Full textThis essay is a corpus study, the aim of which is to investigate the usage of two near-synonymous verb pairs that descend from Germanic and Romance languages. The four verbs begin, commence, hate, and detest were chosen for the study. The analysis is based on occurrences of the verbs in five subcorpora in the COBUILDDIRECT corpus; two subcorpora consist of British and American books and three subcorpora are composed of British and Australian newspapers. Occurrences were also collected from the novel Wuthering Heights (1847) by Emily Brontë. The primary aims of the essay are to investigate the frequency and occurrence of the verbs in different text types as well as in British and American books, to reveal if the verbs are synonymous and whether they occur with the same collocates. Furthermore, the novel Wuthering Heights gives a diachronic view of the usage of the verbs.
This analysis suggests that a usage of the verbs of Germanic origin is more frequent than the verbs of Romance origin. The Romance verbs are more common in novels and books, but also in the British newspaper The Times. Furthermore, the usage of commence and detest seems to be restricted to certain contexts which are connected to the field of the English language in which the verbs occurred at first. The Germanic verbs are clearly favoured in all kinds of texts investigated, even though Wuthering Heights has a high number of occurrences of commence.
On the topic of synonymy, begin and commence have been found to be further apart from each other than hate and detest. This is due to the fact that begin and commence are constructed grammatically different, as well as a restriction in contextual usage of commence. Despite this, commence is used more freely in American books than in British books. The synonymy of hate and detest is connected to the fact that detest expresses a stronger feeling than hate, which makes the two verbs near-synonymous but also gradable. The verbs in the two pairs also collocate with different words, which underlines that they are not real synonyms. These findings support the claim that one should not call the verb pairs synonyms but near-synonyms, and that one has to be careful when choosing a verb.
Gomez, Ramon. "Who Can Retire with a 401(k)? Assessing the Effectiveness of Plans in the Changing Environment Around Retirement Planning in the United States." Scholarship @ Claremont, 2017. http://scholarship.claremont.edu/cmc_theses/1661.
Full textMandel, Kristin. "Untersuchungen zum feldaktivierten Sintern und zum geschwindigkeitsabhängigen Festigkeits- und Versagensverhalten von near-nano WC-Co-Hartstoffen unter Druckbeanspruchung." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2014. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-137517.
Full textStodberg, Deborah R. "DO STUDENTS WHO TAKE ESL COURSES HAVE HIGHER TEST SCORES IN ENGLISH 101? A COMPARATIVE STUDY." Marietta College / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=marietta1142301358.
Full textFalabella, Leonardo Jamel Edim. "Who gets the anti-establishment vote? Crisis, elections, and populism in Western Europe." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/101/101131/tde-09112017-150834/.
Full textPor que a extrema direita cresce em alguns países europeus, ao passo que a esquerda radical cresce em outros? Em estudos sobre ambas as categorias de partido, testa-se frequentemente a hipótese segundo a qual eles têm janelas de oportunidade em crises. Ainda assim, pouco esforço vem sendo feito para comparar como eles se saem sob diferentes contextos econômicos. Este artigo preenche tal lacuna através de análise de dados em painel, com dados desagregados de oito países, em eleições entre 2002 e 2011. O artigo aponta que a votação da extrema direita aumenta significativamente com o desenrolar da crise de 2008, ao passo que não se encontram evidências correspondentes para a esquerda radical. Ademais, o apoio eleitoral à extrema direita é positivamente ligado a índices regionais de PIB per capita, e negativamente ligado a taxas de desemprego. Por contraste, partidos de esquerda radical se saem melhores onde o desemprego é alto. Os resultados sugerem que quedas na atividade econômica são majoritariamente benéficas à extrema direta, mas que tal efeito é crescentemente neutralizado em regiões de alto desemprego.
Maples, LD M. "Terrorism 101- knowledge about the "What and Why" of terrorism as a state and local law enforcement competency." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Sept/08Sep%5FMaples.pdf.
Full textThesis Advisor(s): Strindberg, Anders ; Brannan, David. "September 2008." Description based on title screen as viewed on November 3, 2008. Includes bibliographical references (p. 77-80). Also available in print.
Wong, Chit Yu. "How can a music therapy student facilitate contributions by adolescent clients who have psychiatric disorders in group music therapy? : a thesis submitted to the New Zealand School of Music, Wellington, New Zealand, in partial fulfilment of the requirements for the degree of Master of Music Therapy /." ResearchArchive e-thesis, 2009. http://hdl.handle.net/10063/1003.
Full textBrites, Alice Dantas. "Why do people participate in monitoring the effects of natural resource harvest and trade? Assessing multiple drivers of participation." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/106/106132/tde-24072015-100431/.
Full textO monitoramento participativo dos efeitos ecológicos e socioeconômicos da coleta e do comércio de recursos naturais é uma estratégia considerada promotora tanto da conservação ambiental, quanto do empoderamento das comunidades locais. O sucesso da estratégia, todavia, depende, sobretudo, da disponibilidade e disposição dos indivíduos em participarem. Apesar disso, sabe-se pouco sobre os fatores que determinam a participação voluntária no monitoramento, especialmente em comunidades de pequena escala habitantes de áreas remotas. Sendo assim, esta tese teve por objetivo investigar o efeito de determinantes da participação no monitoramento. Para tal, foi estudada uma comunidade da Amazônia brasileira que coleta e comercializa Carapa guianensis (andiroba), um produto florestal não madeireiro (PFNM). Dois métodos de coleta de dados foram utilizados: (i) survey por meio de entrevistas a 166 adultos ( 18 anos; 51 unidades domésticas) para estimar a intenção de participar e os determinantes da participação, e (ii) implementação de monitoramento experimental dos efeitos da coleta e do comércio de C. guianensis para quantificar a participação real no monitoramento. Os resultados são apresentados em três capítulos. No Capítulo 1, avaliamos se os benefícios econômicos obtidos com o comércio de PFNM ou, alternativamente, o comportamento cooperativo são determinantes mais importantes da participação. Os resultados indicaram que as duas variáveis aumentam a intenção e a participação real no monitoramento. Porém, o comportamento cooperativo foi um indicador mais forte da participação entre as diferentes atividades de monitoramento avaliadas. No Capítulo 2, investigamos os fatores psicológicos que afetam a participação, utilizando como base a Teoria do comportamento planejado (TCP) e avaliando o efeito das variáveis deste modelo sobre a probabilidade da participação voluntária no monitoramento. Os resultados indicaram que, em geral, o modelo da TCP é adequado para prever a intenção de participar em diferentes etapas do monitoramento avaliadas. Em particular, um dos indicadores de atitude (prazer) é capaz de explicar a participação nas quatro etapas de monitoramento. Normas subjetivas também foram importantes preditores da intenção de participar da coleta de dados da população de andiroba e entrevistar outros moradores da comunidade. Já o controle comportamental percebido previu a intenção de participar da coleta de dados sobre a população do recurso natural e a entrada e armazenamento de dados. No Capítulo 3, partimos da hipótese de que a percepção dos impactos ecológicos e socioeconômicos da coleta e do comércio de PFNM pode explicar a participação no monitoramento. Os resultados indicaram que a percepção dos dois tipos de impactos é importante, sobretudo para a participação real. Porém, outros fatores como gênero, idade e escolaridade são determinantes mais fortes da participação em algumas atividades. Ademais, encontramos evidências de que aliar o monitoramento de impactos ecológicos e socioeconômicos aumenta o sucesso da prática. As conclusões do estudo contribuem com lições práticas para aumentar a participação no monitoramento. Destacamos, dentre elas, a importância de estratégias para aumentar a cooperação entre os comunitários, a disseminação de informações sobre os possíveis impactos negativos da coleta e do comércio de recursos naturais, e o fornecimento de compensações financeiras equivalentes ao custo de oportunidade de participação
Marlow, Susan Anne. "A voyage of grief and beauty: a phenomenological study of the experience of supporting a family member with an intellectual disability who is dying in a community setting : a thesis submitted to the Victoria University of Wellington in partial fulfilment of the requirements for the degree of Master of Arts (Applied) in Nursing /." ResearchArchive@Victoria e-thesis, 2007. http://hdl.handle.net/10063/140.
Full textArriagada, Martínez Felipe Andrés. "Análisis de carga sobre boquillas en estanques y recipientes a presión (según ASME VIII) por el método WRC 107 y por método FEM." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/169945.
Full textEn Chile y en gran parte del mundo se utiliza el código ASME VIII, para el diseño, fabricación y montaje de recipientes a presión. Sin embargo, las reglas de montaje del piping, no suelen ser respetadas, provocando fallas en los equipos. Esto es de suma importancia en ingeniería ya que las empresas fabricantes son las responsables de entregar la memoria de cálculo correspondiente. En base a esto, el objetivo general de esta memoria consiste en calcular la capacidad de carga en las boquillas de recipientes a presión, debido a fuerzas externas. Para esto, se deben desarrollar dos procedimientos de análisis: El WRC 107 y una técnica FEM. Los cuales son aplicados en un caso base y en un conjunto de aplicaciones. De esta manera, poder realizar una comparación entre los resultados de ambos análisis. Para lograr los objetivos, se evalúan 3 tipos de cargas: Una carga radial (P), un momento circunferencial (Mc) y uno longtudinal (Ml). Se aplica la metodología del WRC 107 imponiendo la condicion del límite de fluencia del material. Mientras que el FEM (Ansys), consiste en encontrar el instante en donde comienza la deformación plástica, debido a la carga aplicada. De esta manera se puede determinar de forma directa la magnitud. El resultado del caso base, muestra una mayor capacidad de carga en la boquilla de 10 in con respecto a la de 6 in, en ambos análisis (WRC 107 y FEM). Sin embargo, la diferencia entre cada uno de ellos es aproximadamente de un 60 %. Esto se debe a que WRC 107 no considera todos los refuerzos cercanos a la boquilla que presenta el caso base real. Los resultados correspondientes al conjunto de estanques seleccionados, muestran una tendencia a disminuir la capacidad de carga de las boquillas, en función del aumento del parámetro D=T del recipiente. Tanto para el análisis del WRC 107 como para el FEM. Esto muestra que el manto se comporta cada vez más similar a una membrana, perdiendo rigidez. También, se aprecia una diferencia entre ambos métodos de al menos un 29 %. Sin embargo, para la carga ML en la boquilla de 10 in, se presenta una diferencia de solo un 8 %. Se concluye que realizar el análisis de capacidad de carga en un caso real, conlleva a muchas consideraciones que no estan incluidas en el WRC 107, afectando considerablemente los resultados (WRC 107 hasta un 60% más conservativo que FEM). Para los casos parametrizados en funcion de D=T del estanque, se reafirma que WRC 107 es conservativo. Sin embargo, solo para la carga radial y momento circunferencial. No así para el momento longitudinal. Finalmente se destaca la importancia de realizar una técnica FEM para obtener resultados confiables.
Jones, Jordan Wesley. "Who maketh the clouds His chariot the comparative method and the mythopoetical motif of cloud-riding in Psalm 104 and the epic of Baal /." Lynchburg, Va. : Liberty University, 2010. http://digitalcommons.liberty.edu.
Full textSILVA, Wilton Batista da. "Avaliação do desgaste e adesividade dos revestimentos de WC-CO e liga fusível aplicados por aspersão térmica em um substrato AISI 1020." Universidade Federal de Pernambuco, 2017. https://repositorio.ufpe.br/handle/123456789/23921.
Full textMade available in DSpace on 2018-03-12T17:47:15Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Dissertação_Wilton_Batista_versao final_REV02(entrega).pdf: 3769482 bytes, checksum: b8fd0974ecb485164199397ad3db18a2 (MD5) Previous issue date: 2017-02-17
O desgaste é um dos principais problemas comumente encontrados e que levam a substituição de componentes. Em engenharia, surgiram técnicas para possibilitar recuperar esses componentes ou prepará-los para suportar as condições de trabalho. Entre as técnicas utilizadas na recomposição dimensional e melhorias localizadas em partes de componentes de maquinas, tem-se a deposição de materiais na superfície de componentes, conhecida como revestimentos, uma alternativa, por se tratar de um método eficaz na recuperação de elementos desgastados. Os processos de soldagem e de aspersão térmica são os mais utilizados para esse fim. Este trabalho propõe avaliar o comportamento de três revestimentos: metal duro (WC-Co), uma liga fusível à base de Cr, Ni, B e Si e a liga AISI 420 como elemento de ligação entre o substrato e o metal duro, todos aplicados por aspersão térmica utilizando três processos distintos. O substrato utilizado foi AISI 1020. A avaliação foi realizada através de micrografias (Microscopia Ótica e Microscopia Eletrônica de Varredura), ensaio de desgaste abrasivo de acordo com a norma ASTM G65, ensaio de dureza e adesividade conforme norma ASTM C633 e de porosidade, norma ASTM E-2109. De acordo com os resultados obtidos, ficou evidente a opção de se utilizar o revestimento liga fusível como uma alternativa aos revestimentos de metal duro (WC-Co), pois os valores obtidos por esse revestimento nos ensaios de desgaste abrasivo e microdureza, ficaram próximos. Porém, durante a aplicação dos revestimentos foram observadas algumas limitações para aplicação dessa liga fusível: principalmente quando se depara com componentes com cantos vivos e de formas geométricas complexas, houve a formação de bolhas de ar comprometendo a aplicação. A liga AISI 420 como elemento de ligação com o metal duro, nos ensaios de adesividade não apresentou ruptura na ligação entre ambos, caracterizando uma aceitação dessa combinação, aliando assim, uma sobrevida ao substrato após o desgaste e perda da camada do metal duro, pois o AISI 420 possui boa resistência ao desgaste abrasivo. Em termos de porosidade, os revestimentos apresentaram os seguintes resultados em média: metal duro (WC-Co) 0,76%, a liga AISI 420 7,87% e a liga fusível 9,43%, todos abaixo dos valores informados na literatura. Vale registrar a contribuição dessa nova tecnologia como aliada na recomposição de componentes desgastados e melhorias localizadas, aumentando dessa forma a vida útil dos mesmos que, possivelmente seriam descartados como sucatas.
Wear is the main problems frequently found that causes the replacement of the components. In the field of engineering, techniques were developed to make it possible to recover those components or to prepare them to endure work conditions. Among the techniques used in dimensional recomposition and the improvements in component parts of machines, there is the deposition of materials on the components surface, known as coatings, which is an alternative because it is an effective method to recover worn elements. Welding and thermal spraying processes are the most used for this purpose. This work proposes to evaluate the behavior of three coatings: hard metal (WC-Co), a Cr, Ni, B and Si based fused alloy and AISI 420 alloy as a bond between the substrate and the hard metal, all of them applied by thermal spraying using three different processes. For that, we used the AISI 1020 substrate. We did the evaluation through micrographs (Optical Microscopy and Scanning Electron Microscopy), abrasive wear test according to ASTM G65, hardness and adhesion test according to ASTM C633 and porosity based on ASTM E-2109. According to the results, it was evident that the option to use the fused alloy coating is an alternative to the hard metal ones (WC-Co), since the values it obtained in the tests of abrasive wear and microhardness, were close. However, during the coatings application, some limitations were observed when applying this fused alloy: especially when it comes to components with sharp edges and complex geometric shapes, air bubbles were formed which compromised the application. During the adhesion tests the AISI 420 alloy, as a bonding agent with the hard metal, did not show any ruptures in the bond between them, characterizing an acceptance of this combination, thus allying a survival to the substrate after wear and hard metal layer loss, since AISI 420 has good abrasive wear resistance. In terms of porosity, the coatings presented the following results, in average: hard metal (WC-Co) 0.76%, the AISI 420 alloy 7.87% and the fused alloy 9.43%, all below the values reported in the literature. It is worth recording the contribution of this new technology as an ally to the worn components recomposition and localized improvements, thus increasing their lifespan, instead of possibly being discarded as scrap.
Seidel, Marco Thomas. "Solvatationsdynamik an biologischen Grenzschichten." Doctoral thesis, [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969974124.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
FAPESP:98/05906-6
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