Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-10-11T20:39:41Z No. of bitstreams: 1 LauraCamilaDinizDosSantos_TESE.pdf: 4073170 bytes, checksum: 92574134d5de6d9b67507f43f4493cef (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-10-13T23:43:45Z (GMT) No. of bitstreams: 1 LauraCamilaDinizDosSantos_TESE.pdf: 4073170 bytes, checksum: 92574134d5de6d9b67507f43f4493cef (MD5) / Made available in DSpace on 2016-10-13T23:43:45Z (GMT). No. of bitstreams: 1 LauraCamilaDinizDosSantos_TESE.pdf: 4073170 bytes, checksum: 92574134d5de6d9b67507f43f4493cef (MD5) Previous issue date: 2015-07-09 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O grande interesse no uso de filmes de carbono tipo diamante (DLC) ? justificado por suas not?veis propriedades mec?nicas e tribol?gicas, como alta dureza, elevada resist?ncia ao desgaste, in?rcia qu?mica, e baix?ssimo coeficiente de atrito. Essa combina??o de propriedades ?nicas confere ao revestimento aplica??es nas mais diversas ?reas. No entanto, o elevado n?vel de tens?es compressivas, que se originam durante o crescimento do filme, dificulta a obten??o de alta ader?ncia. Al?m disso, a elevada dureza do filme aliada ? diferen?a no coeficiente de expans?o t?rmica em rela??o ao substrato faz com que o DLC n?o acompanhe facilmente a deforma??o do substrato, o que pode provocar a delamina??o e falha total do revestimento, especialmente em a?os. O principal objetivo deste trabalho ? o estudo e desenvolvimento do processo de deposi??o de filmes finos de DLC com a inser??o de nanopart?culas de prata, atrav?s da t?cnica de gaiola cat?dica, seguido da avalia??o de sua ader?ncia ao substrato e seu comportamento tribol?gico. Neste trabalho, filmes de DLC dopados com prata (DLC-Ag) foram depositados sobre o a?o AISI 301, utilizando a t?cnica de deposi??o qu?mica na fase vapor assistida por plasma (PECVD). A parte inovadora desse trabalho refere-se a deposi??o do filme de DLC, onde a prata ? introduzida utilizando uma gaiola cat?dica de prata (GCP) durante o processo de deposi??o. Testes tribol?gicos foram realizados para se analisar a ader?ncia entre filme e substrato, o coeficiente de atrito, e a resist?ncia ao desgaste. A t?cnica de espectroscopia Raman foi utilizada para verificar o arranjo estrutural dos ?tomos de carbono e obter par?metros importantes. Os filmes foram adicionalmente caracterizados por microscopia eletr?nica de varredura (MEV). Os resultados mostraram que a utiliza??o da GCP foi bastante eficaz, pois produziu um filme com maior homogeneidade e dependendo se a gaiola foi utilizada durante todo o processo ou n?o, h? uma propor??o maior ou menor de prata no filme de DLC. / Diamond-like carbon (DLC) films have awaked growing interest due to its outstanding mechanical and tribological properties such as high hardness, high wear resistance, chemical inertness, and low friction coefficient. This is unique combination of specific properties enable film application in several fields. However, the high level of compressive stresses, which arise during film growth, hinders to obtain high adhesion. Furthermore, the high film hardness coupled to the difference in thermal expansion coefficient regarding the substrate, results in the DLC does not easily follow the deformation of the substrate. It may result in film delamination and complete failure, especially in case of substrates made of steels. The main objective of this work is to study and develop the deposition process of DLC thin films with inclusion of silver nanoparticles by cathodic cage technology. The adhesion between film and substrate as well as the tribological behavior were analyzed in detail. Doped Diamond-like carbon films with silver (DLC-Ag) were deposited on AISI 301 steel by plasma-enhanced chemical vapor deposition (PECVD). The innovative part of this PhD thesis is the DLC-Ag film deposition by using a silver cathodic cage. Tribologicals tests were performed to evaluate the adhesion between film and substrate, friction coefficient and wear resistance. Raman spectroscopy was applied to verify the structural arrangement of carbon atoms and to obtain important parameters. The films were further characterized by scanning electron microscopy (SEM). The results proved that the deposition by silver cathodic cage is an effective technique for production of more homogeneous DLC-Ag films. The amount of Ag in the film can be adjusted by dwell time of the cathodic cage process.

SILVA, J. S. P. Estudo das caracter?sticas f?sico-qu?micas e biol?gicas pela ades?o de osteoblastos em superf?cies de tit?nio modificadas pela nitreta??o em plasma. 2008. 119 f. Tese (Doutorado) - Faculdade de Medicina, Universidade de S?o Paulo. S?o Paulo, 2008. / Submitted by CECILIA SANTOS (cecilia@bczm.ufrn.br) on 2010-09-29T13:32:45Z No. of bitstreams: 2 2008Tese_JSandroPS_Estudo.pdf: 2786183 bytes, checksum: a2ca1d8386a1a0d5d0c3befb46b1ed92 (MD5) license_rdf: 20464 bytes, checksum: d540d98f4c56c073d1d99228e27d53ca (MD5) / Approved for entry into archive by clediane guedes(clediane@bczm.ufrn.br) on 2010-09-29T18:15:54Z (GMT) No. of bitstreams: 2 2008Tese_JSandroPS_Estudo.pdf: 2786183 bytes, checksum: a2ca1d8386a1a0d5d0c3befb46b1ed92 (MD5) license_rdf: 20464 bytes, checksum: d540d98f4c56c073d1d99228e27d53ca (MD5) / Made available in DSpace on 2010-09-29T18:15:54Z (GMT). No. of bitstreams: 2 2008Tese_JSandroPS_Estudo.pdf: 2786183 bytes, checksum: a2ca1d8386a1a0d5d0c3befb46b1ed92 (MD5) license_rdf: 20464 bytes, checksum: d540d98f4c56c073d1d99228e27d53ca (MD5) / PURPOSE: The aim of this study was to evaluated the physico-chemical properties of different titanium surfaces modified by means of low temperature plasma nitridind on rat osteoblast cell adhesion and proliferation. METHODS: Pure Titanium discs grade II was submitted to three different surface preparations (polishing, glowglow discharge plasma nitriding in planar and cathodic cage configurations). Surface parameters as roughness, wettability and chemichal composition was determined to compare influency of gas mixture on the modified surface material properties. Cellular morphology was observed by scanning electron microscopy.To evaluate the effect of the surface on cellular response, osteoblast cells (MC3T3) adhesion and proliferation was quantified and data analised by Kruskal-Wallis and Friedman statistical tests. RESULTS: plasma nitriding discs shows rougher surfaces( p<0,02) in cathodic cage configuration andlower contact angle values. MC3T3 cells attached on rough surfaces produced by cathodic cage configuration was statistically significant p<0,05 compared to polished discs. CONCLUSIONS: Glow discharge plasma nitriding improve titanium surface roughness and wettability. MC3T3 cell adhesion behavior is related to substrate chemical composition and topography. Resumo: INTRODU??O: Superf?cies de tit?nio modificadas por diferentes m?todos foram estudadas com base nos par?metros f?sicos e qu?micos de caracteriza??o superficial e sua influ?ncia no comportamento de c?lulas pr?osteobl?sticas (MC3T3) in vitro. M?TODOS: Discos de tit?nio comercialmente puro grau II foram submetidos a tr?s m?todos de modifica??o de superf?cie (polimento, nitretados em plasma em configura??o planar e gaiola cat?dica). As diferentes superf?cies foram caracterizadas para observar o efeito do processamento na estrutura da camada superficial, na rugosidade e molhabilidade. Ensaios de ades?o e prolifera??o celular usando linhagens de c?lulas pr?-osteobl?sticas MC3T3 foram realizados para avaliar o efeito das novas superf?cies no comportamento celular in vitro. RESULTADOS: Os resultados demonstraram que a nitreta??o em plasma na configura??o de gaiola cat?dica produz superf?cies mais rugosas (p<0,02) e com menores ?ngulos de contato com a ?gua. CONCLUS?ES: A ades?o celular ? maior nas superf?cies mais rugosas do que nas superf?cies polidas (p<0,05) e reagem de modo diferente a composi??o qu?mica do substrato e ? topografia da superf?cie

Made available in DSpace on 2014-12-17T14:07:02Z (GMT). No. of bitstreams: 1 FabioSCPpdf.pdf: 1533458 bytes, checksum: 0df903e6bea6c66d762b8b1bbe3c6937 (MD5) Previous issue date: 2009-11-30 / Due to the occurrence of diseases in the use of structural reinforcements in composites, with presentation of concrete blanket detachment, has been identified the need to evaluate the performance of concrete reinforced with glass fiber. This study aims to evaluate these concretes by means of testing methodologies, using concrete with low resistance with structural reinforcement for confinement by preimpregnated glass fiber and traditional fiberglass blanket. The first stage of work was the development of methodologies for analysis, opting for four types, such as the acoustic survey, strength to compressive, the pull-off and ultrasound. Next, tests were carried out using the four selected methodologies in 30 of proof-of-specimens by 5x10 cm, 15 were reinforced with the traditional fiberglass blanket with 5specimens exposed to test a marine environment of marine coastline of Natal-RN and 15 were reinforced with a pre-impregnated glass fiber blanket, as well as 5specimens exposed to a test environment of the marine coastline of Natal-RN. After conducting the acoustic survey, it has been verified a lack of delaminating and air bubbles in the samples, confirming the absence of gross shortcomings in the implementation of the ribs both the traditional fiberglass blanket and in the preimpregnated fiber glass blanket. After carrying out methods of pull-off and compressive strengthening test it was observed that the reinforced proof-bodies with pre-impregnated glass blanket showed maximum stresses higher than the traditional fiberglass blanket; consequently a greater grip with the formation of a smaller area of . fracture, unlike traditional glass mat, which showed lower maximum stresses, with a greater area of fracture. It was also found that the traditional fiberglass blanket presented detachment of blanket-concrete interface, unlike the pre-impregnated fiberglass blanket, which showed a better grip on the blanket-concrete interface. In the trial of ultrasound there was no presence of cracks in the blanket-concrete interface, yielding to both blankets good compactness of the concrete. At the end of this work, they were developed and proposed two methods of testing for evaluation of reinforced concrete structures with composites, for standardization, the acoustic survey and pull-off / Em virtude da ocorr?ncia de patologias na utiliza??o de refor?os estruturais com comp?sitos, com apresenta??o de descolamento da manta do concreto, foi identificada a necessidade de se avaliar o desempenho dos concretos refor?ados com a fibra de vidro. Sendo o objetivo principal deste trabalho, avaliar estes concretos, atrav?s de metodologias de ensaios, utilizando concretos com resist?ncias baixas com refor?o estrutural por confinamento por fibra de vidro pr?impregnada e por manta de fibra de vidro tradicional. A primeira etapa do trabalho consistiu na elabora??o das metodologias de an?lise, optando-se por quatro tipos, a sondagem ac?stica, resist?ncia ? compress?o,o pull-off e o ultra-som. Em seguida, foram realizados os ensaios utilizando as quatro metodologias escolhidas em 30 corpos-de-prova de 5x10 cm, sendo 15 refor?ados com a manta de fibra de vidro tradicional, com 5 corpos-de-prova expostos a um ambiente marinho da orla mar?tima de Natal-RN e sendo 15 refor?ados com a manta de fibra de vidro pr?impregnada, tamb?m com 5 corpos-de-prova expostos a um ambiente marinho da orla mar?tima de Natal-RN. Ap?s a realiza??o dos ensaios de sondagem ac?stica, verificou-se a inexist?ncia de delamina??es e bolhas de ar nas amostras analisadas, comprovando a inexist?ncia de falhas grosseiras na aplica??o dos refor?os tanto na manta de fibra de vidro tradicional, como na da manta de fibra de vidro pr?impregnada. Depois de executadas as metodologias de ensaios de resist?ncia ? compress?o e pull-off, observou-se que os corpos-de-prova refor?ados com a manta de vidro pr?-impregnada apresentaram tens?es m?ximas superiores ?s obtidas com a manta de fibra de vidro tradicional, consequentemente uma ader?ncia maior, com a forma??o de uma menor ?rea de fratura, ao contr?rio da manta de vi dro tradicional, que apresentou tens?es m?ximas inferiores, com uma maior ?rea de fratura. Verificou-se ainda que a manta de fibra de vidro tradicional apresentou descolamento da interface manta/concreto, ao contr?rio da manta de fibra de vidro pr?-impregnada, que apresentou uma maior ader?ncia na interface manta/concreto. No ensaio de ultra-som n?o se observou presen?a de fissuras na interface manta/concreto, obtendo-se para ambas as mantas, boas compacidades do concreto. Ao final do trabalho foram elaboradas e propostas duas metodologias de ensaios para avalia??o das estruturas de concreto armado refor?adas com comp?sitos, para normaliza??o, a sondagem ac?stica e o pull-off

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-22T21:16:09Z No. of bitstreams: 1 GiovannaDeFatimaAlvesDaCosta_DISSERT.pdf: 9340416 bytes, checksum: b55d9a3f32743415d64d3bda38bbd9d5 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-22T21:32:13Z (GMT) No. of bitstreams: 1 GiovannaDeFatimaAlvesDaCosta_DISSERT.pdf: 9340416 bytes, checksum: b55d9a3f32743415d64d3bda38bbd9d5 (MD5) / Made available in DSpace on 2016-08-22T21:32:13Z (GMT). No. of bitstreams: 1 GiovannaDeFatimaAlvesDaCosta_DISSERT.pdf: 9340416 bytes, checksum: b55d9a3f32743415d64d3bda38bbd9d5 (MD5) Previous issue date: 2014-12-12 / Objetivo: avaliar in vitro a rugosidade superficial e a ades?o bacteriana de comp?sitos nanoparticulados, ap?s serem submetidas a diferentes sistemas de acabamento e polimento. Materiais e M?todos Foram confeccionados 60 corpos de prova, distribu?dos em 6 grupos (n=10). Em todos os grupos foi utilizada tira matriz de poli?ster sobre a superf?cie das amostras, e cada tipo de resina foi submetido aos sistemas de acabamento e polimento: discos Sof-Lex Pop-On (3M ESPE, St.Paul, USA) e sistema AstropolTM (Ivoclar Vivadent,NY,USA), caracterizando o grupo experimental; o grupo controle n?o foi submetido a nenhum tipo de t?cnica de acabamento e polimento. A rugosidade m?dia (Ra) em ambos os grupos foi mensurada atrav?s de um rugos?metro (Taylor Hobson Brazil, Ltda., S?o Paulo, SP, Brazil) na configura??o de 0,25mm (cut off) e as imagens da superf?cie obtidas com fotomicrografias captadas por um microsc?pio eletr?nico de varredura (MEV) com aumento de 500 vezes. A ades?o bacteriana foi avaliada por meio da leitura de espectrofotometria com configura??o de 570?m. Os resultados foram submetidos ? an?lise de vari?ncia (ANOVA dois fatores. Resultados: Foram encontradas diferen?as estat?sticas significativas entre os grupos quanto ? rugosidade e ? ades?o bacteriana. Para a resina Filtek Z350 XT houve diferen?as entre os sistemas de acabamento e polimento testados, onde o sistema que apresentou menor rugosidade superficial foi o Sof-lex Pop-On. Para a resina IPS Empress Direct, o sistema de acabamento e polimento Astropol, obteve menores resultados de rugosidade superficial. Quanto ? ades?o bacteriana, o menor valor de densidade ?ptica para a resina Filtek Z350 XT foi para o grupo que utilizou o sistema de acabamento e polimento Sof-Lex Pop-On e para a resina IPS Empress Direct o grupo que utilizou o sistema Astropol. Al?m disso, verificou-se uma correla??o positiva entre a rugosidade superficial e ades?o bacteriana nas superf?cies polidas (r = 0,612, p <0,001) Conclus?es: a rugosidade superficial e a ades?o bacteriana est?o estreitamente relacionadas. O sistema de acabamento e polimento Sof-Lex Pop-On est? mais indicado para a resina nanoparticulada Filtek Z350 XT e o sistema de acabamento e polimento Astropol para a resina nanoh?brida IPS Empress Direct. / Objective: To evaluate in vitro the surface roughness and bacterial adhesion of nanoparticle composites, after being subjected to different finishing and polishing systems. Materials and Methods: 66 specimens were prepared, and 30 with Filtek Z350 XT (3M ESPE, USA) and 30 with the resin IPS Empress Direct (Ivoclar Vivadent, USA), divided into 6 groups (n = 10 ). Six specimens were prepared for analysis in scanning electron microscopy (SEM) .Each kind of resin was subjected to finishing and polishing systems: Sof-Lex Pop-On discs (3M ESPE, USA) and AstropolTM system (Ivoclar Vivadent , USA), featuring the experimental group. The control group did not undergo any kind of finishing and polishing technique. The average roughness (Ra) in both groups was measured using a roughness in the setting of 0.25 mm (cut off) and surface images obtained with photomicrographs taken with a scanning electron microscope (SEM) magnified 500 times. Bacterial adherence was evaluated by determining the absorbance (OD) of the suspension of adhered cells by spectrophotometer at 570 nm. The results were submitted for analyzed with 2-way ANOVA at ?=.05 and Tukey multiple comparison tests. Results: Statistically significant differences were found between the groups in terms of roughness and bacterial adhesion. Filtek Z350 XT for resin were no differences between the tested finishing and polishing systems, where the system of lowest surface roughness was the Sof-Lex Pop-On. To the resin IPS Empress Direct, the finishing and polishing system Astropol, had lower results of surface roughness. As for bacterial adhesion, the lowest optical density value for Filtek Z350 XT was for the group that used the finishing and polishing system Sof-Lex Pop-On and the resin IPS Empress Direct the group that used the Astropol system. In addition, there was a positive correlation between surface roughness and bacterial adhesion on polished surfaces (r = 0.612) Conclusions: surface roughness and bacterial adhesion are closely related. The finishing and polishing Sof-Lex Pop-On system is more suitable for nanoparticulate Filtek Z350 XT and the finishing and polishing system Astropol for resin nanoh?brida IPS Empress Direct.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2015-12-14T21:16:06Z No. of bitstreams: 1 MariaFernandaDeOliveiraCarvalho_DISSERT.pdf: 1141209 bytes, checksum: 65f01a0777b8abd70e29becdbcc85f9f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2015-12-15T20:22:06Z (GMT) No. of bitstreams: 1 MariaFernandaDeOliveiraCarvalho_DISSERT.pdf: 1141209 bytes, checksum: 65f01a0777b8abd70e29becdbcc85f9f (MD5) / Made available in DSpace on 2015-12-15T20:22:06Z (GMT). No. of bitstreams: 1 MariaFernandaDeOliveiraCarvalho_DISSERT.pdf: 1141209 bytes, checksum: 65f01a0777b8abd70e29becdbcc85f9f (MD5) Previous issue date: 2014-08-12 / A insufici?ncia card?aca cr?nica (ICC) ? a via final comum da maioria das doen?as que acometem o cora??o, sendo respons?vel por elevados ?ndices de mortalidade e de interna??o hospitalar, bem como redu??o expressiva da qualidade de vida das pessoas afetadas. Interven??es com vistas ? otimiza??o da ades?o do paciente ao seu regime m?dico, e melhora do comportamento de autocuidado, t?m se mostrado eficazes na preven??o de interna??es n?o planejadas e melhora do resultado em pacientes, entretanto, estudos t?m mostrado a problem?tica da n?o ader?ncia, e alguns instrumentos psicol?gicos vem sendo utilizados para mostrar que tra?os indicam dificuldades com a ades?o ao tratamento. Tendo isso em vista, o objetivo deste trabalho constitui avaliar as evid?ncias de validade do Millon Behavioral Medicine Diagn?stic (MBMD) em popula??o de pacientes com ICC. Participaram do estudo indiv?duos com ICC, dos sexos masculino e feminino, com faixa et?ria entre 18 e 85 anos, atendidos em hospital de refer?ncia da cidade de Natal-RN. Um total de 120 pacientes responderam, al?m do MBMD, outro question?rio estruturado com itens referentes a aspectos sociodemogr?ficos e cl?nicos. Os resultados indicaram que o par?metro de fidedignidade do MBMD mostrou-se satisfat?rio, demonstrando a const?ncia dos resultados para avalia??es realizadas com o instrumento em quest?o. Em se tratando da popula??o pesquisada, p?de-se verificar que a doen?a foi mais prevalente no sexo masculino, mas as mulheres apresentaram as maiores m?dias nos indicadores referentes a h?bitos negativos de sa?de e humor deprimido. Os mais jovens e aqueles que n?o tinham companheiro apresentaram as maiores m?dias em grupos de itens que tratavam de sentimentos de tristeza e des?nimo. N?o foram verificadas diferen?as relacionadas a h?bitos negativos de sa?de e ader?ncia problem?tica entre pacientes em classes funcionais diferentes. Mais estudos nessa linda de pesquisa, com popula??es maiores e de outras regi?es do pa?s, s?o necess?rios no intuito de amplia??o dos dados aqui apresentados. / Chronic heart failure (CHF) is the final common pathway of most diseases affecting the heart, being responsible for a high level of mortality and hospitalization, as well as significant reduction in quality of life of those affected. Interventions that claim to optimize patient adherence to their medical regimen, and improve self-care behavior, have proven effective in preventing unplanned admissions and improves the outcome for patients, however, studies have shown the problem of non-adherence, and some psychological instruments have been used to show that traces indicate difficulties with treatment adherence. Having shown this, the aim of this work is to evaluate the evidence of validity of the Millon Behavioral Medicine Diagnostic (MBMD) in a population of patients with CHF. The study included individuals with CHF, males and females, between the age of 18 and 85 years, treated in a reference hospital in the city of NatalRN. A total of 120 patients answered, in addition to the MBMD, another questionnaire structured with sociodemographic aspects and clinical itens. The results indicated that the parameter of the MBMD reliability was satisfactory the most of extracted factors, and some scale. In terms of the population studied, we could verify that the disease was more prevalent in men, but women had the highest average in indicators related to negative health habits and depressed mood. Younger pacients and those who had no partner had the highest averages in groups of items that dealt with feelings of sadness and discouragement. Hasn?t been observed differences related to negative health habits and problematic adherence among patients in different functional classes. More studies in this research line, with a larger population and from other regions of the country, are needed in order to expand the data presented here

Made available in DSpace on 2014-12-17T14:57:51Z (GMT). No. of bitstreams: 1 JairJF_TESE.pdf: 2222193 bytes, checksum: b572697498429b717de3a15791bc4a09 (MD5) Previous issue date: 2011-07-21 / Thermal recovery methods, especially steam injection, have been used to produce heavy oils. However, these methods imply that the metallic casing-cement sheath interface is submitted to thermal cycling. As a consequence, cracking may develop due to the thermal expansion mismatch of such materials, which allows the flow of oil and gas through the cement sheath, with environmental and economical consequences. It is therefore important to anticipate interfacial discontinuities that may arise upon Thermal recovery. The present study reports a simple alternative method to measure the shear strength of casing-sheath interfaces using pushthrough geometry, applied to polymer-containing hardened cement slurries. Polyurethane and recycled tire rubber were added to Portland-bases slurries to improve the fracture energy of intrinsically brittle cement. Samples consisting of metallic casing sections surrounded by hardened polymer-cement composites were prepared and mechanically tested. The effect of thermal cycles was investigated to simulate temperature conditions encountered in steam injection recovery. The results showed that the addition of polyurethane significantly improved the shear strength of the casing-sheath interface. The strength values obtained adding 10% BWOC of polyurethane to a Portland-base slurry more than doubled with respect to that of polyurethane-free slurries. Therefore, the use of polyurethane significantly contributes to reduce the damage caused by thermal cycling to cement sheath, improving the safety conditions of oil wells and the recovery of heavy oils / Atualmente, os m?todos com maior ?ndice de sucesso de recupera??o de ?leos pesados s?o os t?rmicos, principalmente a inje??o de vapor. Este m?todo de recupera??o coloca a interface entre o revestimento met?lico e a bainha de cimento em ciclagem t?rmica, que devido ? diferen?a de coeficientes de expans?o entre os dois materiais pode provocar o surgimento de trincas, possibilitando a passagem de fluidos pela bainha de cimento. Isto ocasiona s?rios riscos s?cio-econ?micos e ambientais. Para minimizar este problema, foi realizado um estudo que consiste em mensurar a resist?ncia ao cisalhamento entre um tubo de a?o e uma bainha de cimento. Ao material cimentante foram adicionados pol?meros, como poliuretana e borracha reciclada triturada de pneus. A adi??o de pol?meros visa melhorar a plasticidade do material cimentante e, assim, aumentar a ader?ncia da pasta endurecida sobre o revestimento, bem como a energia de ruptura do conjunto. Diante disso, a meta principal desse estudo foi avaliar a ader?ncia de comp?sitos cimentantes para po?os de petr?leo com revestimentos met?licos ap?s ciclagens t?rmicas, simulando as condi??es de varia??o de temperatura a que po?os de petr?leo s?o submetidos durante a recupera??o de ?leos pesados por m?todos t?rmicos. Observou-se que com a adi??o de poliuretana houve uma melhoria significativa da ader?ncia da interface revestimento met?lica - bainha de cimento com rela??o ? pasta padr?o, sem pol?meros. Os melhores resultados obtidos foram com pastas contendo 10% de poliuretana, que apresentaram aumento de mais de 100% na resist?ncia ao cisalhamento, em rela??o ? pasta padr?o. A adi??o de poliuretana ? pasta de cimento contribui de forma significativa para reduzir o dano causado pela ciclagem t?rmica a bainhas de cimento, melhorando a seguran?a e as condi??es de produ??o de po?os de petr?leo sujeitos ? recupera??o secund?ria por m?todos t?rmicos

Submitted by PPG Odontologia (odontologia-pg@pucrs.br) on 2018-03-14T13:07:26Z No. of bitstreams: 1 DEISE_CAREN_SOMACAL_DIS.pdf: 3724441 bytes, checksum: 7f1a32555f56a0c3c48079417ccb5782 (MD5) / Approved for entry into archive by Tatiana Lopes (tatiana.lopes@pucrs.br) on 2018-03-21T13:30:22Z (GMT) No. of bitstreams: 1 DEISE_CAREN_SOMACAL_DIS.pdf: 3724441 bytes, checksum: 7f1a32555f56a0c3c48079417ccb5782 (MD5) / Made available in DSpace on 2018-03-21T13:51:59Z (GMT). No. of bitstreams: 1 DEISE_CAREN_SOMACAL_DIS.pdf: 3724441 bytes, checksum: 7f1a32555f56a0c3c48079417ccb5782 (MD5) Previous issue date: 2018-01-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / (Artigo 1 Efeito das varia??es do pH na superf?cie de resinas compostas de incremento ?nico) Aim: To evaluate, in vitro, quantitatively and qualitatively, the effect of pH variations on surface roughness (Ra) and bacterial adhesion (Cn) of Bulk-Fill composite resins followed by simulated toothbrushing. Materials and Methods: Thirty samples of each composite resin were obtained: G1 (control): Z250; G2: Filtek Bulk-Fill (FTK); G3: Tetric N Ceram Bulk-Fill (TTC); G4: Aura Bulk-Fill (AUR). After 24 h, the samples were polished and then alternated by DES/RE solutions for 15 cycles of 24 h each at 37?C. Then, the samples were submitted to simulated toothbrushing. The Ra and Cn measurements were quantitatively analyzed in three stages: after polishing (Ra0 and Cn0), after pH cycles (Ra1 and Cn1) and after simulated toothbrushing (Ra2 and Cn2). Measurements on new samples submitted only to simulated toothbrushing were also performed (Ra* and Cn*). The Ra values were submitted to two-way ANOVA, followed by the Tukey?s test (?=0.05). The Kruskal-Wallis test followed by multiple comparisons was applied for Cn analysis. Surface topography and bacterial adhesion were observed by Scanning Electron Microscopy (SEM). Results: Z250, FTK and TTC showed no significant change in Ra regardless of the treatment performed, except for AUR which obtained superior Ra at Ra2 (p <0.05). In the bacterial count, FTK differed from the others in Cn0 and Cn1. In Cn2 there was no difference between the composite resins. Only after Cn*, the Z250 differed from all other materials. SEM images showed cracking and exposure of fillers in Ra1, with detachment of the exposed fillers. Microcavities were observed in all composite resins in Ra2. Bacterial adhesion occurred in all composite resins regardless of the treatment. There was greater bacterial adhesion in Cn1 for Z250 and FTK. Conclusion: The pH cycles did not alter the Ra of composite resins Z250, FTK, TTC and AUR. Simulated toothbrushing after pH cycles caused Ra increase only for AUR, and reduced bacterial adhesion in Z250 and FTK composite resins. There was degradation of the surface of all composite resins, as well as bacterial adhesion. (Artigo 2 Effect of gastric acid on the surface of bulk-fill composite resins) Aim: To evaluate, in vitro, quantitatively and qualitatively, the effect of gastric acid on surface roughness and bacterial adhesion in Bulk-Fill composite resins followed by simulated toothbrushing. Materials and Methods: 30 samples of each Bulk-Fill composite resin were obtained: G1 (control): Z250; G2: Filtek Bulk- Fill (FTK); G3: Tetric N-Ceram Bulk-Fill (TTC); G4: Aura Bulk-Fill (AUR). The samples were polished after 24 h and immersed in 10 ml of gastric acid for 24 h at 37?C. Following, the samples were submitted to simulated toothbrushing. Ra and Cn were obtained in three different stages: initial (Ra0 and Cn0), after gastric acid (Ra1 and Cn1) and after gastric acid and simulated toothbrushing (Ra2 and Cn2). Additional samples were submitted to the simulated toothbrushing test only and received the same measurements (Ra* and Cn*).Two-way ANOVA was used to evaluate Ra, followed by the Tukey test. Regarding the Cn analysis, the Kruskal-Wallis test was used, followed by multiple comparisons. The significance level was of 5%. Results: Z250 and FTK had a significant increase in surface roughness in Ra1. In Ra2, the four composite resins did not significantly differ from Ra0, but there was a significant reduction of the means in Ra2 of Z250 and FTK compared to Ra1. For Cn, Z250 and FTK allowed an increased biofilm accumulation in comparison with TTC and AUR. SEM images showed crack formation and exposure of fillers in Ra1, occurring detachment of the exposed fillers. Microcavities were observed in all composite resins in Ra2. Bacterial adhesion occurred in all composite resins regardless of the treatment. There was higher bacterial adhesion in Cn1, followed by reduction of bacterial adhesion in Cn2 for all tested materials, except for AUR. Conclusion: Gastric acid increased the surface roughness of Z250 and FTK composite resins, as well as promoted higher bacterial accumulation compared to TTC and AUR composite resins. There was degradation of the surface of all composite resins, as well as bacterial adhesion. / (Artigo 1 Efeito das varia??es do pH na superf?cie de resinas compostas de incremento ?nico) Objetivo: Avaliar, in vitro, de forma quantitativa e qualitativa, o efeito das varia??es de pH na rugosidade superficial (Ra) e na ades?o bacteriana (Cn) de resinas compostas de incremento ?nico seguido de escova??o simulada. Materiais e M?todos: Trinta amostras de cada resina composta (5mm de largura e 4mm de altura) foram obtidas -G1(controle): Z250; G2: Filtek Bulk-Fill (FTK); G3: Tetric N Ceram Bulk-Fill (TTC); G4: Aura Bulk-Fill (AUR). Ap?s 24 h, as amostras foram polidas e ent?o alternaram por solu??es DES/RE por 15 ciclos de 24 h cada a 37?C. Na sequ?ncia foram submetidas ? escova??o simulada. As medidas Ra e Cn foram analisadas quantitativamente em tr?s etapas: ap?s polimento (Ra0 e Cn0), ap?s ciclos de pH (Ra1 e Cn1) e ap?s escova??o simulada (Ra2 e Cn2). Medi??es em novas amostras submetidas apenas ? escova??o simulada foram realizadas (Ra* e Cn*). Para an?lise dos dados de Ra foi utilizada a ANOVA de dois fatores, seguida do teste de Tukey (?=0,05). O teste de Kruskal-Wallis seguido de compara??es m?ltiplas foi utilizado para an?lise de Cn. A topografia superficial e a ades?o bacteriana foram observadas em Microscopia Eletr?nica de Varredura (MEV). Resultados: Z250, FTK e TTC n?o tiveram altera??o significativa de Ra independente do tratamento realizado, com exce??o da AUR que obteve Ra superior em Ra2 (p<0,05). Em Cn, FTK diferiu das demais em Cn0 e Cn1. Em Cn2 n?o houve diferen?a entre as resinas compostas. Apenas ap?s Cn*, a Z250 diferiu dos outros materiais. Imagens em MEV evidenciaram forma??o de trincas e exposi??o de part?culas de carga em Ra1, com desprendimento das part?culas expostas. Houve forma??o de microcavidades em todas as resinas compostas em Ra2. Ocorreu ades?o bacteriana em todas as resinas compostas independente do tratamento. Houve maior ades?o bacteriana em Cn1 para Z250 e FTK. Conclus?o: Os ciclos de pH n?o alteraram Ra das resinas compostas Z250, FTK, TTC e AUR. A escova??o simulada ap?s os ciclos de pH causou aumento de Ra apenas para AUR e reduziu a ades?o bacteriana nas resinas compostas Z250 e FTK. Houve degrada??o da superf?cie de todas as resinas compostas, assim como ades?o bacteriana. (Artigo 2 Efeito do ?cido g?strico na superf?cie de resinas compostas de incremento ?nico) Objetivo: Avaliar de forma quantitativa e qualitativa o efeito do ?cido g?strico na rugosidade superficial e na ades?o bacteriana nas resinas compostas de incremento ?nico (Bulk-Fill) seguido de escova??o simulada. Materiais e M?todos: Trinta amostras de cada resina composta (di?metro de 5mm e altura de 4mm) foram obtidas - G1(controle): Z250; G2: Filtek Bulk-Fill (FTK); G3: Tetric N-Ceram Bulk-Fill (TTC); G4: Aura Bulk-Fill (AUR). As amostras foram confeccionadas e polidas ap?s 24 h. As amostras foram imersas em 10 ml de ?cido g?strico durante 24 h em 37?C. Na sequ?ncia, as resinas compostas foram submetidas ? escova??o simulada. As medidas de Rugosidade Superficial (Ra) e Contagem bacteriana (Cn) foram obtidas em tr?s diferentes etapas: inicial (Ra0 e Cn0), ap?s ?cido g?strico (Ra1 e Cn1) e ap?s ?cido g?strico e escova??o simulada (Ra2 e Cn2). Amostras adicionais foram submetidas unicamente ao teste de escova??o simulada e receberam as mesmas medi??es (Ra* e Cn*). ANOVA de dois fatores foi utilizada para avalia??o de Ra, seguida do teste de Tukey. Para an?lise de Cn foi utilizado o teste de Kruskal-Wallis, seguido de compara??es m?ltiplas. O n?vel de signific?ncia foi de 5%. A topografia superficial e a ades?o bacteriana foram observadas em microscopia eletr?nica de varredura (MEV). Resultados: Z250 e FTK tiveram aumento significativo na rugosidade superficial em Ra1. Em Ra2, as quatro resinas compostas n?o diferiram estatisticamente de Ra0, por?m houve redu??o significativa das m?dias em Ra2 da Z250 e FTK em compara??o a Ra1. Para Cn, Z250 e FTK permitiram maior ac?mulo de biofilme em rela??o ? TTC e AUR. Imagens em MEV evidenciaram forma??o de trincas e exposi??o de part?culas de carga em Ra1, ocorrendo desprendimento das part?culas de carga expostas. Microcavidades foram observadas em todas as resinas compostas em Ra2. A ades?o bacteriana ocorreu em todas as resinas compostas independente do tratamento. Houve maior ades?o bacteriana em Cn1, seguida de redu??o da ades?o bacteriana em Cn2 para todos os materiais testados, exceto pela AUR. Conclus?o: O ?cido g?strico aumentou a rugosidade superficial das resinas compostas Z250 e FTK, assim como promoveu maior ac?mulo bacteriano em rela??o ?s resinas compostas TTC e AUR. Houve degrada??o da superf?cie de todas as resinas compostas, assim como ades?o bacteriana.

Made available in DSpace on 2014-12-17T15:38:41Z (GMT). No. of bitstreams: 1 RemersonRM.pdf: 448865 bytes, checksum: 14cbfed29d38210302974844ec6adb11 (MD5) Previous issue date: 2008-07-11 / Introduction: This work intents to characterize behavioral indicators of tack to the hemodialysis treatment in a sample of carrying patients of chronic kidney failure (CKF) in the great Natal/RN. The therapeutical adherence represents the agreement degree between the patient behavior and the health team lapsings. The CKF is the gradual and irreversible loss of the renal function, being the hemodialysis treatment an important alternative to assist or to substitute the kidneys. Method: The sample consisted in 80 chronic kidney patients in hemodialysis treatment in two located clinical centers in the region of the great Natal, RN. It was used as instruments (a) a protocol of clinical data collection, (b) the Millon Index of Personality Styles (MIPS) and (c) a script of halfstructuralized interview. Results: The results show a balance between the genders (51% of female and 48.8% of the male sex), average age and equal average time of dialysis respectively to the 43,4 years (?13,25 years) and 22,04 years (?4,24 years). The marital status of half of the sample is married, predominating basic education (43.6%) and a familiar income until a minimum wage (43.8%). It had been defined six physicianlaboratorial indicators to evaluate the therapeutical adherence, further the use of the evaluation of the health team and the patient themselves. Thus, there was an average adherence around 55.97% of the sample ?18.37%). However only between selfassessment of the patients about the adherence and the assessment made by blood pressure post-dialysis indicated a significant association (p=0,029, qui-square test). On the other hand, there was a significant association (p <0.05, chi-square test) among the criteria for treatment adherence and issues investigated in the interview - the perception on the quality of the health services provided to patients, the difficulties following the prescribed diet, the characterization of the days between dialysis sessions and the perception of patients about the dialysis sessions. It was also noted a significant association (p <0.05, Levene test) between adherence to therapy and scales that constitute the MIPS. The health team characterized the patients more adherent behavior as an attitude of acceptance of the treatment, looking actively for their implementation, for more information and knowledge, and establishing a positive communication with the team and with other patients. Similar results were confirmed by the MIPS evaluation. According to that assessment the more compliant patients adopt a more optimistic attitude, trying to act or adapt themselves to their environment, processing cognitively both concrete and objective information, such as more speculative and symbolic information. In addition they establish a gregarious, cooperative, submissive and flexibly pattern of interpersonal relationships to social demands. These characteristics managed to explain 55.7% of the adherence variation according the health team and 23.3% of the variation according the CaxP laboratory indicator. Conclusions: The MIPS shown to be able to identify the most and least adherent to therapy patients. The use of different adherence indicators is important for an evaluation covering the different facets of this process. The adhesion levels are observed within registered by the relevant literature. There is need for further studies with a larger sample to deepen the data findings in this work / Introdu??o: Este trabalho busca caracterizar indicadores comportamentais de ader?ncia ao tratamento hemodial?tico por meio do Invent?rio Millon de Estilos de Personalidade em uma amostra de pacientes portadores de insufici?ncia renal cr?nica (IRC) na grande Natal/RN. A ader?ncia terap?utica representa o grau de concord?ncia entre o comportamento do paciente e as prescri??es da equipe de sa?de. A IRC ? a perda progressiva e irrevers?vel da fun??o renal, sendo o tratamento hemodial?tico uma importante alternativa para auxiliar ou substituir os rins. M?todo: A amostra consistiu de 80 pacientes renais cr?nicos em tratamento hemodial?tico em dois centros cl?nicos localizados na regi?o da grande Natal, RN. Utilizaram-se como instrumentos (a) um protocolo de coleta de dados cl?nicos, (b) o invent?rio Millon de estilos de personalidade (MIPS) e (c) um roteiro de entrevista semi-estruturada. Resultados: Os resultados mostram que houve equil?brio entre os sexos (51% do sexo feminino e 48,8% do sexo masculino), idade m?dia e tempo m?dio de di?lise respectivamente iguais ? 43,4 anos (?13,25 anos) e 22,04 anos (?4,24 anos). O estado civil de metade da amostra ? casado, predominando o ensino fundamental (43,6%) e uma renda familiar at? um sal?rio m?nimo (43,8%). Definiram-se seis indicadores cl?nico-laboratoriais para avaliar a ader?ncia terap?utica, mais o uso da avalia??o da equipe de sa?de e do pr?prio paciente. Desse modo, observou-se uma ader?ncia m?dia em torno de 55,97% da amostra (?18,37%). Contudo apenas entre a auto-avalia??o do paciente acerca da ader?ncia e a avalia??o feita atrav?s da press?o arterial p?s-di?lise indicou-se uma associa??o significativa (p=0,029, teste qui-quadrado). Por outro lado, houve uma associa??o significativa (p<0,05, teste qui-quadrado) entre os crit?rios de ader?ncia ao tratamento e aspectos investigados na entrevista a percep??o da qualidade dos servi?os de sa?de prestados aos pacientes, as dificuldades no seguimento da dieta prescrita, a caracteriza??o dos dias entre as sess?es de di?lise e a percep??o dos pacientes acerca das sess?es de di?lise. Tamb?m se observou uma associa??o significativa (p<0,05, teste de Levene) entre a ader?ncia terap?utica e as escalas que constituem o MIPS. A equipe de sa?de caracterizou o comportamento do paciente mais aderente como uma postura de aceita??o do tratamento, buscando ativamente pela sua realiza??o, por informa??es e mais conhecimento, al?m de estabelecer uma comunica??o positiva com a equipe e com os demais pacientes. Resultados semelhantes foram confirmados pela avalia??o do MIPS. Segundo essa avalia??o os pacientes mais aderentes adotam uma atitude mais otimista, buscando agir ou adaptar-se ao seu meio, processando cognitivamente tanto informa??es concretas e objetivas, como informa??es mais especulativas e simb?licas. Al?m de estabelecer um padr?o de relacionamento interpessoal greg?rio, cooperativo, submisso e flex?vel ?s demandas sociais. Estas caracter?sticas conseguiram explicar 55,7% da varia??o da ader?ncia definida segundo a equipe de sa?de e 23,3% da varia??o da ader?ncia segundo o indicador laboratorial CaxP. Conclus?es: O MIPS demonstrou ser capaz de identificar os pacientes mais e menos aderentes. O uso de diferentes indicadores de ader?ncia ? importante para uma avalia??o que abarque as diferentes facetas desse processo. Os n?veis de ader?ncia observados est?o dentro do registrado pela literatura pertinente. H? a necessidade de outros estudos com uma amostra maior para aprofundar os dados achados nesse trabalho