Made available in DSpace on 2014-12-17T15:41:55Z (GMT). No. of bitstreams: 1 JessicaEAF_DISSERT.pdf: 2802549 bytes, checksum: f4835fb277277d60879f0b91ee07c465 (MD5) Previous issue date: 2011-02-28 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / In this work, the plant species Copernicia prunifera (Miller) H. E. Moore (carnauba), naturally occurring which prevails in the northeast region of Brazil was the subject of studies aiming its use as external coating of pipelines used in petroleum industry. The part of the plant worked were the leaves, also called straw, which were coated with resinous material. For this purpose, it was necessary to evaluate the effectiveness of the use of acrylic resins in the straw carnauba coating. The properties of the untreated carnauba straw and chemically treated with sodium hydroxide, hexane and carbon tetrachloride were investigated by ATRFTIR, SEM and thermal analysis. The first two techniques showed that treatment with solvents has caused major changes in the straw surface, while the thermal analysis indicated that the sodium hydroxide caused variations in thermal stability of straw constituents. Water absorption measurements showed that treatments have accelerated the absorption process and the reduction of contact angle values for treated samples with solvents indicated higher hidrophilicity of straw. The tensile tests showed lower values of elastic modulus and tensile strength for treated samples. Furthermore, coatings using pure commercial resins A and B as well as the formulations with clay were applied in straw and they were examined once again through thermal analysis, water absorption measurements, contact angle and mechanical tests. To analyze the effect of heat ageing, samples were subjected to tensile tests again in order to assess its resistance. The results showed that the resins/clay formulations increased thermal stability of straw, they promoted a good impermeabilization and caused significant decrease in the values of elastic modulus and tensile strength. Evaluating the ageing effect on the mechanical properties, it has been showed good recovery to the coated straw with the formulations A 60 and A 80% in modulus and tensile strength values and elongation at break values have remained very close. It is thus concluded that the carnauba straw can be used as a coating of pipelines with significant cost savings, since there is no need for pretreatment for its use and shows itself as a viable biotechnology alternative, contributing to the quality of coatings material and environment preservation. / Neste trabalho, a esp?cie vegetal Copernicia prunifera (Miller) H. E. Moore (carna?ba), de ocorr?ncia natural predominante da regi?o Nordeste do Brasil, foi alvo de estudos objetivando sua utiliza??o como revestimento externo de dutos da ind?stria do petr?leo. A parte da planta trabalhada foram as folhas, tamb?m chamadas de palhas, que receberam um revestimento resinoso. Para tanto, foi necess?rio avaliar a efic?cia do uso de resinas acr?licas no revestimento da palha de carna?ba. As propriedades da palha n?o-tratada e tratada quimicamente com hidr?xido de s?dio, hexano e tetracloreto de carbono foram investigadas por FTIR-ATR, MEV e TG. As duas primeiras t?cnicas mostraram que os tratamentos com os solventes provocaram maiores modifica??es na superf?cie da palha, enquanto o estudo termogravim?trico indicou que o hidr?xido de s?dio causou varia??es na estabilidade t?rmica dos constituintes da palha. Medidas de absor??o de ?gua mostraram que os tratamentos aceleraram o processo de absor??o e a redu??o dos valores de ?ngulo de contato para as amostras tratadas com os solventes indicou aumento da hidrofilicidade das palhas. Os ensaios mec?nicos apresentaram menores valores de m?dulo el?stico e tens?o de ruptura para as amostras tratadas. Al?m disso, revestimentos com resinas comerciais puras A e B assim como composi??es com argila foram aplicados nas palhas e estas foram analisadas novamente atrav?s da termogravimetria, medidas de absor??o de ?gua, ?ngulo de contato e resist?ncia mec?nica. Para analisar o efeito do envelhecimento t?rmico realizado, as amostras foram submetidas mais uma vez aos ensaios mec?nicos, a fim de avaliar sua resist?ncia. Os resultados mostraram que as formula??es resinas/argila aumentaram a estabilidade t?rmica da palha, promoveram uma boa impermeabiliza??o e causaram significativa redu??o nos valores de m?dulo el?stico e tens?o de ruptura. Ao avaliar o efeito do envelhecimento nas propriedades mec?nicas, percebeu-se boa recupera??o nos valores de m?dulo e tens?o para a palha revestida com as formula??es A 60 e A 80%. J? os resultados de deforma??o mostraram que os valores permaneceram bem pr?ximos. Dessa forma, conclui-se que a palha de carna?ba pode vir a ser utilizada como revestimento de dutos com significante redu??o de custos, j? que n?o h? a necessidade de tratamento pr?vio para seu uso e mostra-se como uma alternativa biotecnol?gica vi?vel, contribuindo com a qualidade de material de revestimentos e a preserva??o do meio ambiente.

Made available in DSpace on 2014-12-17T15:41:56Z (GMT). No. of bitstreams: 1 JessicaSM_DISSERT.pdf: 2134980 bytes, checksum: d9d14af471d3325a59885975b6f26a37 (MD5) Previous issue date: 2012-02-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In this work a biodegradable composite using the carnauba straw s powder as reinforcement on chitosan matrix polymeric were manufactured. Firstly, were carried out the chemistry characterization of the carnauba straw s powder before and after treatments with NaOH and hexane. Goering and Van Soest method (1970), flotation test, moisture absorption, FTIR, TG/DTG, DSC and SEM have also being carried out. Composites were developed with variations in granulometry and in powder concentrations. They were characterized by TG/DTG, SEM and mechanicals properties. The results of chemical composition showed that the carnauba straw s powder is composed of 41% of cellulose; 28,9% of hemicellulose and 14% of lignin.The flotation test have indicated that the chemical treatment with NaOH decreased the powder s hidrophilicity.The thermal analysis showed increased of thermal stability of material after treatments. The results of FTIR and SEM revealed the removal of soluble materials from the powder (hemicelluloses and lignin), the material became rougher and clean. The composites obtained showed that the mechanicals properties of the composites were decreased in respect at chitosan films, and the composites with the powder at 150 Mesh showed less variation in the modulus values. The speed test of 10 mm/min showed the better reproducibility of the results and is in agreement to the standard ASTM D638. The SEM analysis of fracture showed the low adhesion between the fiber/matrix. The increase of volume of powder in the composite caused a decrease in values of stress and strain for the samples with untreated powder and treated with hexane. The composite with 50% of the powder s treated in NaOH didn t have significant variation in the values of stress and strain as compared with the composites with 10% of the powder, showing that the increase in the volume of fiber didn t affect the stress and strain of the composite. Thereby, it is concluded that the manufacture of polymeric composites of chitosan using carnauba straw s powder can be done, without need for pre-treatment of reinforcement, become the couple of carnauba straw s powder-chitosan a good alternative for biodegradable composites / Neste trabalho foi produzido um comp?sito biodegrad?vel utilizando o p? da palha de carna?ba como refor?o e quitosana como a matriz polim?rica. Inicialmente, foi realizada a caracteriza??o qu?mica do p? da palha de carna?ba antes e ap?s os tratamentos com NaOH e hexano. Os m?todos de an?lise utilizados foram a determina??o da composi??o qu?mica descrita por Goering e Van Soest (1970), ensaio de flota??o e absor??o de umidade, FTIR, TG/DTG, DSC e MEV. Os comp?sitos foram desenvolvidos com varia??es na granulometria e nas concentra??es do p? da palha de carna?ba. Estes foram caracterizados por TG/DTG, MEV e por suas propriedades mec?nicas. Os resultados da composi??o qu?mica mostraram que o p? da palha de carna?ba ? constitu?do de 41% de celulose; 28,9% de hemicelulose e 14% de lignina. Os ensaios de flota??o indicaram que o tratamento com NaOH diminuiu o comportamento hidrof?lico do p?. As an?lises t?rmicas indicaram aumento na estabilidade t?rmica do material ap?s os tratamentos. Os resultados do FTIR e MEV evidenciaram a remo??o de materiais sol?veis do p? (hemiceluloses e lignina), deixando o material mais rugoso e limpo. An?lise t?rmica dos comp?sitos mostrou que ambos, refor?o e matriz sofrem degrada??o t?rmica na mesma temperatura. A adi??o do p? da palha de carna?ba diminui as propriedades mec?nicas do comp?sito em rela??o ao filme de quitosana puro e, o comp?sito obtido com os p?s a 150 Mesh foi o que apresentou menor varia??o nos valores de m?dulo. A velocidade de ensaio de 10 mm/min apresentou melhor reprodutibilidade nos resultados e se encontra de acordo com a norma ASTM D638. As an?lises de fratura do MEV mostraram baixa ades?o entre a fibra e a matriz. O aumento do volume de p? no comp?sito polim?rico provocou a diminui??o dos valores de tens?o e deforma??o para as amostras com p? n?o-tratado e tratado com hexano. Os comp?sitos com os p?s a 50% tratado com NaOH n?o apresentaram varia??o significativa nos valores de tens?o e deforma??o em rela??o aos comp?sitos com o p? a 10 %, indicando que o aumento no volume de fibra n?o comprometeu os valores de tens?o e deforma??o do comp?sito. Desse modo, pode-se concluir que a fabrica??o de comp?sitos polim?ricos de quitosana utilizando o p? da palha de carna?ba pode ser feito, sem a necessidade de tratamento pr?vio do refor?o, tornando o par p? de palha de carna?ba-quitosana uma boa alternativa para materiais comp?sitos biodegrad?veis

Made available in DSpace on 2014-12-17T15:42:04Z (GMT). No. of bitstreams: 1 RoseliaSL.pdf: 2427942 bytes, checksum: 72c973dd87b5433d7d0b592195af336a (MD5) Previous issue date: 2008-09-02 / In this present work an ethnographic research was performed with 84 native medicinal specimens from the Litoral Norte Riograndense, from which two plants Cleome spinosa Jacq e Pavonia varians Moric were submitted to ethnobotanic, phytochemistry and pharmacologic investigations. Additionally, a phytopharmacological research of the medicinal specimen Croton cajucara Benth ( native plant of the Amazon region of Brazil) was improved. The obtained phytochemical results of the C. spinosa and P. varians showed the presence of flavonoids constituents, among other components. The two flavonoids (2S)-5-hydroxy-7,4 -dimethoxy-flavanone and 5,4 -dihydroxy-3,7,3 -trimethoxy-flavone were isolated from C. spinosa. The antioxidant activity of the hydroalcoholic extracts of C. spinosa and P. varians solubilized in the microemulsion systems SME-1 and SME-4, was evaluated in the DPPHmethod. The used SME systems [obtained with Tween 80: Span 20 (3:1) and isopropyl myristate (IPM)] improved the dissolution of those tested polar extracts, with higher efficacy to the SME-1 system (in which ethanol was included as cosurfactant). The CE50 values evidenced for P. varians were 114 [g/mL (SME-1) and 246 [g/mL (SME-4); for C. spinosa it was 224 [g/mL (SME-1) and 248 [g/mL (SME-4), being the system SME-1 more effective for both tested extracts. The hydroalcoholic extracts of P. varians (HAE-PV) was also submitted to pharmacological screening for antinociceptive activity in animal models. The oral administration of this extract (100, 300 and 1000 mg/kg) inhibited the acetic acid-induced writhing in mice. The higher inhibition (74%) was evidenced to the 1000 mg/kg administered dose. Its effect on the central nervous system (CNS) was investigated by tail flick and formalin-method and reveled that it has negligible antinociceptive action on the CNS. After taking consideration of HAE-PV interaction, Pavonia varians Moric could be used as a potent analgesic agent in case of peripheral algesia, without affecting the CNS. The phytochemical study of the stem bark of Croton cajucara Benth lead to the isolation of 19-nor-clerodanetype diterpenes, as well as to the separation of its fixed oil FO-CC. This non polar oil material reveled to be rich in sesquiterpenes and 19-nor-clerodanes components. The biologic effect of OF-CC was evaluated in the development in vitro of the fungis phytopatogens such as Fusarium oxysporum, Rhizoctonia solani and Sclerotium rolfsii. Significant inhibitory effect of the tested fungis (at 0,2 mg.mL-1 dosage) were comproved. A Mass Spectrometry study of clerodane-type diterpenes was developed in order to identify characteristic fragments on mass spectrometra of both clerodane and 19-nor-clerodane presenting an α,β-insaturated carbonyl moiety at ring A of the decalin-system. For that study, mass spectroscopy data were analysed for 19-nor-clerodanes [trans-dehydrocrotonin (DCTN), trans-crotonin (CTN), cis-cajucarin B (c-CJC-B), and cajucarinolide (CJCR)] and for clerodanes [isosacacarin (ISCR) and transcajucarin A (t-CJC-A)] obtained from the stem bark of C. cajucara, and also clerodane-type from other species. The trans-junction of the enone-system clerodanes was clear correlated with the presence of the characteristic ions at m/z 95, 121 e 205. Meanwhile, the characteristics ions at m/z 122 e 124 were correlated to cis-junction. The trans-junction of the enone-system 19-nor-clerodanes showed characteristics ions at m/z 161, 134 e 121. This study could be successful employed for identification of clerodane constituents from other specimens without any additional spectroscopic analyses, as well as a previously phytochemical analyzes in clerodane project search / Neste trabalho realizou-se uma pesquisa etnogr?fica envolvendo oitenta e quatro esp?cimes vegetais nativas do Litoral Norte Riograndense. Duas destas esp?cies Cleome spinosa Jacq e Pavonia varians Moric foram alvo de estudos etnobot?nico, fitoqu?mico e farmacol?gico. Em adi??o, ampliou-se os estudos fitofarmacol?gicos de Croton cajucara Benth, uma esp?cie medicinal nativa da regi?o Amaz?nica. Os resultados fitoqu?micos de Cleome spinosa e Pavonia varians indicaram dentre outros metab?litos especiais, a presen?a de flavon?ides. Os flavon?ides (2S)-5-hidroxi-7,4 -dimetoxi-flavanona e 5,4 -diidroxi-3,7,3 -trimetoxi-flavona foram isolados de Cleome spinosa. A atividade antioxidante dos extratos hidroalco?licos de P. varians e C. spinosa solubilizados em sistemas microemulsionados (SME), foi avaliada frente ao radical livre DPPH. Os sistemas SME-1 e SME-4 [contendo Tween 80: Span 20 (3:1) e miristato de isopropila (IPM)] mostraram-se eficazes na solubiliza??o dos extratos avaliados, tendo sido observado melhor efic?cia para o sistema SME-1 [EC50 = 113,84 μg/mL (SME-1) and 246,00 μg/mL (SME-4) para P. varians e EC50: 223,97 μg/mL (SME-1) e 248,37 μg/mL (SME-4) para C. spinosa (sistema SME-1contendo etanol como cotensoativo e SME-4, isento de cotensoativo]. A a??o antinociceptiva de Pavonia varians foi confirmada atrav?s do teste das contor??es abdominais, tendo sido observado rela??o dose/efeito inibit?rio dependente do extrato hidroalco?lico desta esp?cie. Os testes do tipo tail flick e da formalina afastaram a possibilidade da participa??o de mecanismos antinociceptivos no sistema nervoso central. No entanto, no teste da formalina evidenciou-se a participa??o de mecanismos antiinflamat?rios na produ??o do efeito antinociceptivo deste extrato. O estudo fitoqu?mico das cascas do caule de Croton cajucara Benth conduziu ao isolamento de diterpenos do tipo 19-nor-clerodano, bem como ? obten??o do ?leo fixo OF-CC, rico em sesquiterpenos e 19-nor-clerodano bioativos. O efeito de OF-CC foi avaliado no desenvolvimento in vitro dos fungos fitopatog?nicos Fusarium oxysporum, Rhizoctonia solani e Sclerotium rolfsii propagados em meio de cultura Batata-dextrose-agar. A resposta fisiol?gica, variou de acordo com o tipo de fungo testado, tendo sido observado que o OF-CC apresentou efeito fungist?tico significativo, com efeito inibit?rio mais est?vel para o g?nero de fungo Fusarium oxysporum. Realizou-se ainda, um estudo de espectrometria de massas objetivando-se a identifica??o de fragmentos caracter?sticos de diterpenos do tipo clerodano (com dados obtidos na literatura) e 19-nor-clerodano (isolados das cascas do caule de C. cajucara), tendo sido evidenciado que a jun??o trans de clerodanos est? correlacionada com a presen?a dos ?ons caracter?stico de m/z 95, 121 e 205. Os sistemas de jun??o cis de clerodanos apresentaram ?ons caracter?sticos de m/z 122 e 124. A jun??o trans de 19-nor-clerodanos foi correlacionada com a presen?a dos ?ons caracter?stico de m/z 161, 134 e 121. Este estudo pode ser utilizado na identifica??o de diterpenos do tipo clerodano e 19-nor-clerodano, contendo carbonila α,β-insaturada no anel A do sistema decal?nico, evitando desta forma, a brigatoriedade de isolamento e caracteriza??o via RMN

Made available in DSpace on 2014-12-17T15:42:09Z (GMT). No. of bitstreams: 1 OlimpioJSJ_DISSERT.pdf: 3250692 bytes, checksum: e135d66bdc46879fce0bf4c54a705b97 (MD5) Previous issue date: 2013-07-29 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The use of analogies in high school is often useful for chemistry teaching, either on textbooks or by teachers in the classroom.This use is justified by the large number of abstract concepts that rules this course. Analogies are conceptualized by several authors, which converge on the idea that these are tools that seek a way to elucidate an unknown concept by comparing it to a familiar one, relating their similar and dissimilar features. An analysis on a survey of analogies found in high school chemistry textbooks and chemical equilibrium studies is performed in order to verify whether they are leading to misconceptions for their use by students and/or for their use by teachers in the classroom, or whether they promote a learning facilitation / O uso de analogiasno Ensino M?dio ? frequentemente utilizado ao ensinar qu?mica, seja abordada em livros did?ticos ou em sala de aula pela utiliza??o dos professores, isso ? devido ao grande n?mero de conceitos abstratos regentesdesta disciplina. As analogias s?o conceituadas por diversos autores, no qual estes convergem para a ideia de que estas s?o ferramentas que buscam uma maneira de elucidarum conceito desconhecido comparandooa um conceito familiar,relacionando seus atributos similares e n?o similares. A partir de um levantamento das analogias encontradas nos livros did?ticos de qu?mica do Ensino M?dio que abordam o conte?do equil?brio qu?mico e de estudos j? produzidos na ?rea apontando os principais erros conceituais apresentados pelos estudantes neste conte?do? realizada uma an?lise das analogias encontradas, para com isso realizar a verifica??o do seu direcionamento a erros conceituaispelo uso dos estudantes e/ou pela utiliza??o de professores em sala de aula ou se promovem a facilita??o da aprendizagem

Made available in DSpace on 2016-04-28T20:13:50Z (GMT). No. of bitstreams: 1 1998 - Erick Samuel Rojas Cajavilca.pdf: 1008769 bytes, checksum: 8add22c3d7e5c2118b5b62321be8eb7d (MD5) Previous issue date: 1998-09-17 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / This thesis analyzes the conditions of competitiveness of the chain of milk in Brazil, in the scope of the Mercosul having as reference of the distinct contributions of the theoretical quarrels on Competitiveness, Comparative Advantages and Enterprise Strategy. The first chapter argues economic literature referent to the competitiveness, dynamic comparative advantages and strategies of the companies. The subsequent chapters present a profile of the l?cteas chains in the countries of the Mercosul and an analysis of the transformations in the competitive environment throughout all the chain of latic?nios in Brazil to start off desregulation, stabilization and regional integration. A change of the profile of the chain of milk is verified, since the increase of the heterogeneidade of the agricultural producer, until changes in the profile of the consumption. To make front to these structural modifications in course, in the sector the companies invest in diverse strategies that allow to its permanence and growth in the market. The confirmation clearest is the resetting of the sector, in a process that some companies initiate before the opening of the economy, in middle of the decade of 80. Others, would initiate it as reflected of the processes of regional integration and stabilization of the economy. We look for to show as in one same sector, in a similar environment, the companies adopt diverse strategies, in function of its resources and perspectives of market. Having as objective the maintenance of competitive positions. / Esta disserta??o analisa as condi??es de competitividade da cadeia de l?cteos no Brasil, no ?mbito do Mercosul ? luz dos distintos aportes das discuss?es te?ricas sobre Competitividade, Vantagens Comparativas e Estrat?gia Empresarial. O primeiro cap?tulo discute a literatura econ?mica sobre a competitividade, vantagens comparativas din?micas e estrat?gias das empresas. Os cap?tulos subseq?entes apresentam um perfil das cadeias l?cteas nos pa?ses do Mercosul e uma an?lise das transforma??es no ambiente competitivo ao longo de toda a cadeia de latic?nios no Brasil a partir da desregula??o, estabiliza??o e integra??o regional. Verifica-se uma mudan?a do perfil da cadeia de l?cteos, desde o aumento da heterogeneidade do produtor rural, at? mudan?as no perfil do consumo. Para fazer frente a estas modifica??es estruturais em curso, no setor as empresas investem em diversas estrat?gias que permitam a sua perman?ncia e crescimento no mercado. A constata??o mais clara ? a recomposi??o do setor, num processo que algumas empresam iniciam antes da abertura da economia, em meados da d?cada de 80. Outras, o iniciariam como reflexo dos processos de integra??o regional e estabiliza??o da economia. Procuramos mostrar como num mesmo setor, num ambiente similar, as empresas adotam diversas estrat?gias, em fun??o dos seus recursos e perspectivas de mercado. Tendo como objetivo a manuten??o de posi??es competitivas.

Made available in DSpace on 2016-04-28T20:19:13Z (GMT). No. of bitstreams: 1 2006-Marcio Flavio Amarla de Souza.pdf: 940715 bytes, checksum: 03764d32db745078b745f453e5d2ff66 (MD5) Previous issue date: 2006-12-29 / The objective of this study is to analyze the multicriterial performance of financial institutions in operation in Brazil during the period from 2001 to 2005. The research results searched to show a new perception about the financial performance of the banks which is not available to managers and the market in general, through the financial statements and traditional financial indexes analyses. That is, from information which would not be available for the conventional techniques, Data Envelopment Analysis (DEA) results, which is the methodology used for this analysis, can provide a better overview of market competitiveness conditions, as much for the top managers as for the others stakeholders. For that was conducted an analysis using leverage indicators, operational costs, immobilization, immediate liquidity, deposits levels, credit operations and yield. From the identification of the 100’s biggest banks showed in the list published by Valor Financeiro Magazine between years 2002 and 2006, the study analyzed the indicators under two aspects, plus the discussion about the modeling presented. First of all made an analysis about the institutions efficiency distributed in four segments: wholesale, middle market, financing and retail. Secondly searched to demonstrate the relative performance of the 100’s biggest all along five years, with the aim to making a competitiveness sector analysis panel. Related to the general analysis, was pointed that immobilization was the variable with biggest need of reduction to increase the efficiency of the sector, occurring a change of level in the period 2001 to the 2003 in comparison to last the two years of the research. It was also noticed that efficiency was related to low operational costs and high level yields. On the segments analysis, the wholesale banking was the most efficient and, in a general, in each segment the performance leaders were not the institutions with the highest assets. At end, it was noticed that, although the increase in banking concentration of the country, the competition degree on the pointed items of this research appear to be sufficiently high. / O objetivo deste estudo ? analisar o desempenho multicriterial de institui??es financeiras em opera??o no Brasil durante o per?odo de 2001 a 2005. Os resultados desta pesquisa buscaram mostrar uma nova percep??o sobre a performance financeira de bancos que n?o se encontram dispon?veis aos gestores e ao mercado em geral atrav?s dos balan?os e tradicionais an?lises de ?ndices financeiros. Ou seja, a partir de informa??es que n?o estariam dispon?veis pelas t?cnicas convencionais, os resultados da an?lise envolt?ria de dados, que ? a metodologia utilizada para an?lise, podem proporcionar melhor vis?o das condi??es de competitividade do mercado, tanto para a alta administra??o quanto para as demais partes interessadas. Para tanto se conduziu uma an?lise utilizando indicadores de alavancagem, custo operacional, imobiliza??o, liquidez imediata, n?veis de dep?sitos e de opera??es de cr?dito e rentabilidade. A partir da identifica??o dos 100 maiores bancos que constavam da listagem publicada na Revista Valor Financeiro entre os anos 2002 e 2006, o estudo analisou os indicadores sob dois enfoques, al?m de discutir a modelagem apresentada. O primeiro fez uma an?lise sobre a efici?ncia de institui??es distribu?das em quatro segmentos: atacado, middle market, financiamento e varejo. O segundo buscou demonstrar a performance relativa dos 100 maiores ao longo de cinco anos, com a finalidade de formar um painel de an?lise da competitividade do setor. Quanto a an?lise geral, observou-se que a imobiliza??o foi a vari?vel com maior necessidade de redu??o para melhoria na efici?ncia do setor, ocorrendo uma mudan?a de patamar no per?odo 2001 ? 2003 em compara??o aos ?ltimos dois anos da pesquisa. Notou-se tamb?m que a efici?ncia estava relacionada a baixos custos operacionais e altas rentabilidades. Na an?lise por segmentos, o atacado foi o mais eficiente e, de uma forma geral, em cada segmento os l?deres de desempenho n?o eram as institui??es com os maiores ativos. Por fim, observou-se que, apesar do aumento na concentra??o banc?ria do pa?s, o grau de competi??o nos itens apontados por esta pesquisa parece bastante elevado.

Made available in DSpace on 2016-04-28T20:19:19Z (GMT). No. of bitstreams: 1 2008 - Antonio Carlos de Almeida Guedes.pdf: 505445 bytes, checksum: b6b1c55bca3516d99a394491972c194a (MD5) Previous issue date: 2008-09-09 / The Corporate Social Responsibility started as a response to the consumers growing demands in relation to the corporations role and their performance in the market. The implementation of the Corporate Social Responsibility, allowed the company to go beyond its work as an economical agent with the mission of producing wealth, and to become itself a social agent, part of the society, which should also be accountable for the other. Therefore, nowadays the company cannot just look for the obtaining of the profit, but it should be aware to the obligations to its interaction with the society, such as the environmental preservation, the creation and maintenance of jobs, the contribution for the professional development, the quality of the goods and services, among other activities not legally assumed, but important for the continuity of the company as well. Thus, the Corporate Social Responsibility has been used by large corporations in several sectors of the economy and, in addition of having an ethical and committed performance, it is a great competitive advantage as well. / A Responsabilidade Social Corporativa surgiu como resposta ?s crescentes exig?ncias dos consumidores em rela??o ?s organiza??es e sua atua??o no mercado. A implanta??o da Responsabilidade Social Corporativa fez com que a empresa fosse al?m de um agente econ?mico com a miss?o de produzir riqueza, tamb?m um agente social, um componente da sociedade que tamb?m deve prestar contas aos demais. Portanto, atualmente a empresa n?o pode apenas buscar a obten??o do lucro, deve tamb?m atentar-se ?s obriga??es inerentes ao seu conv?vio com a sociedade, tais como a preserva??o ambiental, a cria??o e manuten??o de empregos, a contribui??o para a forma??o profissional, a qualidade dos bens e servi?os, entre outras atividades que n?o est?o legalmente assumidas, mas que s?o important?ssimas para a continuidade da empresa. A Responsabilidade Social Corporativa vem sendo utilizado por grandes corpora??es nos mais diversos setores e demonstra ser al?m de atua??o ?tica e comprometida, tamb?m uma grande vantagem competitiva.

Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-05-03T21:15:13Z No. of bitstreams: 1 2016 - Daniel Guimar?es Ubiali.pdf: 7253233 bytes, checksum: ce10a8e3d4ef67ad93a0034844382ed3 (MD5) / Made available in DSpace on 2017-05-03T21:15:13Z (GMT). No. of bitstreams: 1 2016 - Daniel Guimar?es Ubiali.pdf: 7253233 bytes, checksum: ce10a8e3d4ef67ad93a0034844382ed3 (MD5) Previous issue date: 2016-10-26 / CAPES / For investigation of Mycobacterium avium subsp. paratuberculosis infection 34 buffaloes properties or ranches in Northeastern Brazil were visited for paratuberculosis diagnosis. Investigations included herd evaluations, inspection of facilities and pastures, obtainment of flock history, clinical examination of suspicious animals and collecting samples for diagnosis. Samples were obtained from 26 farms or ranches, including two slaughterhouses and a quarantine area in six states. Approximately 15,600 buffalos, including males and females of the Murrah, Mediterranean and Jafarabadi breeds as well as their crossbreeds, were evaluated for meat, dairy and mixed properties with semi-intensive or extensive regimes. For diagnostic purposes, necropsies, histopathological and immunohistochemical exams and Ziehl-Neelsen tests of fecal smears and scraped intestinal mucosa were performed. Polymerase chain reaction (PCR) methods were applied to samples of feces, milk, mesenteric nodes and intestines. This exams allowed us to identify eigth new Johne?s disease outbreaks, which, together with those previously identified by our staff, allow us to infer that the disease is being dispersed in the Brazilian Northeast, similar to what is occurring with bovine herds in other areas of the country. The increase in the number of positive farms is a consequence of the ignorance of farmers, inadequate health management, free trade of ruminants and lack of a official control program in the country. This study alerts for risk of commercialization of dairy products for human consumption, reinforces the importance of research on paratuberculosis in Brazil and contributes to the understanding of the factors that work together to increase the number of paratuberculosis cases in the Brazilian Northeast. / Com o objetivo de identificar focos e estudar a epidemiologia e o diagn?stico da paratuberculose em b?falos na regi?o Nordeste do Brasil foram realizadas visitas e ou examinados material provenientes de 34 propriedades com suspeita cl?nica da doen?a. Obtivemos material biol?gico de sete estados da regi?o Nordeste do Brasil (Maranh?o, Cear?, Para?ba, Pernambuco, Alagoas e Bahia). Dos rebanhos foi obtido o hist?rico, realizou-se avalia??o cl?nica e inspe??o das instala??es e pastagens. Para a confirma??o do diagn?stico foi coletado material para exames laboratoriais em 26 propriedades ou cria??es de b?falos, entre estes, dois matadouros e um quarenten?rio. Foram rebanhos cujo somat?rios de b?falos era de aproximadamente 15.600 b?falos, das ra?as Murrah, Mediterr?neo, Jafarabadi e seus mesti?os, com aptid?o para corte, leite ou mista, em propriedades com regimes semi-intensivo, extensivo ou extrativista. Foram realizadas 22 necropsias e coleta de material para exames histopatol?gicos e imuno-histoqu?micos, al?m de colora??o de Ziehl-Neelsen em esfrega?os de fezes, raspados de mucosa intestinal e fragmentos de linfonodo mesent?rico e de intestino que apresentavam les?es sugestivas da doen?a. Para a realiza??o da rea??o em cadeia da polimerase (PCR) foram utilizadas amostras de fezes, leite, linfonodos mesent?ricos e intestinos. Estes exames permitiram identificar oito focos de paratuberculose, o que nos permite inferir que a doen?a est? se dispersando na regi?o Nordeste do Brasil a exemplo do que est? acontecendo em outras regi?es do pa?s com o rebanho bovino. O desconhecimento da doen?a, o manejo inadequado, o com?rcio n?o regulamentado de b?falos e a falta de um programa de controle voltado para a realidade da regi?o facilitam a dispers?o do agente e s?o fatores que contribuem para o aumento do n?mero de focos no pa?s. Os resultados desta pesquisa contribuem com a epidemiologia e o diagn?stico da doen?a em b?falos e auxilia na compreens?o dos fatores que colaboram para a ocorr?ncia crescente do n?mero de casos desta doen?a.

Submitted by Fernanda Ciolfi (fernanda.ciolfi@puc-campinas.edu.br) on 2016-04-06T18:43:12Z No. of bitstreams: 1 Luiz Ricardo Vieira Gonzaga.pdf: 4978693 bytes, checksum: 22e5218d6daab1bb1914d2919134607a (MD5) / Made available in DSpace on 2016-04-06T18:43:12Z (GMT). No. of bitstreams: 1 Luiz Ricardo Vieira Gonzaga.pdf: 4978693 bytes, checksum: 22e5218d6daab1bb1914d2919134607a (MD5) Previous issue date: 2016-02-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Adolescence is a period of physical, psychological, social and cultural changes, include stressors in the school context as to do academic tests and admission exams for college. To deal with these situations, teenagers present different ways of coping which influence the academic engagement, studying and coping with test anxiety, that affects their academic performance. Therefore, the coping process can be a mediating or moderating variable of the impact of stress on school performance. This research aimed to describe and analyze the relations between academic stressors, test anxiety and its coping and the academic performance of High School students with and without behavior problems, using a developmental and self-regulating approach. Participated 411 students (girls: 59.85%), with 14-20 year olds (M = 16.27; SD=1.04) attending High School on a public school in S?o Paulo?s capital. We applied the following instruments in six classrooms: Brazilian Economic Classification Criteria (Brazilian Criteria), the Test Anxiety Scale (TAS) and Adolescent/Child?s Self Report Responses to Stress ? Academic Problems (RSQ-AS) - both translation processes authorized, the Youth Self-Report (YSR) and the Scale of Coping with Academic Tests, specially developed to access the coping process before, during and after tests. We did these statistical analisis: descriptive, correlations, structural equations modeling and network analysis. Most students had test anxiety (n= 379; 62.53%), girls in particular (n= 227; 66.96%), and n=379; 20.84% demonstrated behavioral problems (Internalizing: n=139; 36.68%; Externalizing: n=69; 18.21%). The student?s average grade in the subject was above five points (M = 6.63; SD=1.18). When facing academic stressors, they reacted with involuntary responses (M = 0.23; SD= 0.04). To deal with tests, the coping process is more adaptive than maladaptive (AC: M = 55.39; SD= 10.60; MAC: M = 41.64; SD=12.80), with ways of coping like Self-reliance, Support-seeking and Problem-solving. Classrooms showed significative differences in socioeconomic status, age groups, number of stressful sources and general average. Structural equation modeling indicates that students with better academic performance were those who had internalizing problems, not externalizing problems, higher adaptive coping score, secondary control engagement coping and involuntary engagement,and whose involuntary disengagement score was lower. Students who experienced test anxiety had higher involuntary engagement and higher number of academic stressors. Students who experienced higher number of academic stressors presented higher primary and secondary control engagement scores, voluntary and involuntary disengagement, and involuntary engagement. The students who had internalizing problems had more test anxiety and higher number of academic stressors. The students who had higher maladaptive coping scores had internalizing problems, test anxiety and higher number of academic stressors. The network analysis also indicated associations between: higher age, higher grades schooling and better academic performance; higher grades schooling and more stress; and low academic performance and academic stressors (not understanding classes or homework, having trouble studying, feeling pressured to do something, and having bad classes or teachers). The behavior problems stand out in this sampling, as well as coping difficulties regarding school events, which referee a psychological intervention in this educational grade. / A adolesc?ncia ? um per?odo de mudan?as f?sicas, psicol?gicas e socioculturais, com muitos estressores, inclusive no contexto escolar, a exemplo da realiza??o de provas acad?micas e o vestibular. Para lidar com essas situa??es, os adolescentes apresentam diferentes estrat?gias de enfrentamento (EE), as quais influenciam o engajamento acad?mico, o comportamento de estudar e de lidar com a ansiedade em situa??es de provas, afetando seu rendimento acad?mico. O enfrentamento (coping), portanto, pode atuar como uma vari?vel moderadora ou mediadora do impacto do estresse sobre o desempenho escolar. Esta pesquisa teve por objetivo descrever e analisar as rela??es entre estressores acad?micos, ansiedade de provas escolares e seu enfrentamento, e o desempenho acad?mico, em alunos do Ensino M?dio, com e sem problemas de comportamento, adotando uma perspectiva desenvolvimentista e de autorregula??o. Participaram 411 alunos (meninas = 59,85%), com 14-20 anos (M = 16,27; DP=1,04), cursando o Ensino M?dio, em uma escola p?blica da capital paulista. Foram aplicados, nas 6 turmas: o Crit?rio de Classifica??o Econ?mica Brasil, o Test Anxiety Scale (TAS) e Adolescent/Child?s Self Report Responses to Stress ? Academic Problems (RSQ-AS), ambos com valida??o lingu?stica autorizada, o Youth Self-Report (YSR), e a Escala de Enfrentamento de Provas Escolares, especialmente elaborada, avaliando o coping antes, durante e depois de provas. Foram feitas an?lises estat?sticas: descritiva, correla??es, modelagem de equa??es estruturais e an?lise de redes. A maioria dos estudantes tinha ansiedade de provas (n= 379; 62,53%), especialmente as meninas (n=227; 66,96%), e n= 379; 20,84% apresentaram problemas de comportamento (Internalizantes: n= 139; 36,68%; Externalizantes: n= 69; 18,21%). A m?dia geral das notas das disciplinas das turmas ficou acima de cinco pontos (M = 6,63; DP= 1,18). Frente a estressores acad?micos, os alunos reagiam com respostas involunt?rias (M = 0,23; DP=0,04). Diante de provas, o coping era mais adaptativo do que mal adaptativo (CA: M = 55,39; DP= 10,60; CMA: M = 41,64; DP=12,80), com EE de autoconfian?a, busca de suporte e resolu??o de problemas. Houve diferen?as significativas entre as s?ries escolares no n?vel socioecon?mico, idade, n?mero de estressores e m?dia geral. As an?lises de equa??es estruturais indicaram que os alunos com maior desempenho acad?mico foram aqueles com problemas internalizantes, sem problemas externalizantes, maior escore de coping adaptativo, engajamento de controle secund?rio e engajamento involunt?rio, e menor escore de desengajamento involunt?rio. Alunos com ansiedade de provas apresentaram maior engajamento involunt?rio e maior n?mero de estressores. Os alunos com maior n?mero de estressores apresentaram maiores escores de engajamento de controle prim?rio e secund?rio, desengajamento volunt?rio e involunt?rio, e engajamento involunt?rio. Os alunos com problemas internalizantes foram aqueles com ansiedade de provas e maior n?mero de estressores. Os alunos com maiores escores de coping mal adaptativo foram aqueles com problemas internalizantes, ansiedade de provas e maior n?mero de estressores. A an?lise de redes indicou tamb?m associa??es entre: maioridade, maior escolaridade e melhor desempenho acad?mico; maior escolaridade e mais estresse; e baixo desempenho e estressores acad?micos (n?o entender as aulas e as tarefas, ter dificuldade para estudar, sentir-se pressionado e ter professores ruins). Os problemas de comportamento se destacaram nesta amostra, assim como as dificuldades de enfrentamento dos eventos escolares, indicando a necessidade de interven??es psicol?gicas nesse n?vel educacional.

Submitted by Kelson Anthony de Menezes (kelson@ucb.br) on 2017-04-03T18:43:59Z No. of bitstreams: 1 LuizAugustoDamascenoBrasilTese2016.pdf: 5944308 bytes, checksum: d0f37d4c4d81290f3a95783bbbb50ed8 (MD5) / Approved for entry into archive by Kelson Anthony de Menezes (kelson@ucb.br) on 2017-04-03T18:44:48Z (GMT) No. of bitstreams: 1 LuizAugustoDamascenoBrasilTese2016.pdf: 5944308 bytes, checksum: d0f37d4c4d81290f3a95783bbbb50ed8 (MD5) / Made available in DSpace on 2017-04-03T18:44:48Z (GMT). No. of bitstreams: 1 LuizAugustoDamascenoBrasilTese2016.pdf: 5944308 bytes, checksum: d0f37d4c4d81290f3a95783bbbb50ed8 (MD5) Previous issue date: 2016-08-26 / This research analyzes the socioeconomic and demographic characteristics of enrolled students, graduates and evaders of social and professional training courses offered by the Territorial Qualification Plan (PlanTeQ) of the Federal District in 2007 under the aegis of the National Qualification Plan - PNQ, which was established by Resolution No. 333 of July 10, 2003, the Deliberative Council of the Fund for Workers (CODEFAT). This is an exploratory and descriptive study of aggregate data, having a quantitative approach and document analysis and data collection and methodological procedures. The study comes from the lack of information and knowledge of the students subjected to this initiative of governments at the federal and district level, performed in the first decade of this century for skilled workers, proclaimed as intended for social and professional inclusion. After the data analysis, the results demonstrated that the research objectives were fully achieved, which allowed even trace to present the socioeconomic and demographic characteristics of a student enrolled in the Federal District in a PlanTeQ qualification course in year as regards the study. / Esta pesquisa analisou as caracter??sticas socioecon??mico-demogr??ficas dos educandos inscritos, concluintes e evasores dos cursos de qualifica????o social e profissional oferecidos pelo Plano Territorial de Qualifica????o (PlanTeQ) do Distrito Federal no ano de 2007, sob a ??gide do Plano Nacional de Qualifica????o ??? PNQ, que foi institu??do pela Resolu????o n?? 333, de 10 de julho de 2003, do Conselho Deliberativo do Fundo de Amparo ao Trabalhador (CODEFAT). Tratase de uma pesquisa explorat??ria e descritiva de dados agregados, possuindo uma abordagem quantitativa, tendo a an??lise documental e o levantamento de dados como procedimentos metodol??gicos. O estudo nasce da car??ncia de informa????es e conhecimentos sobre os educandos submetidos a esta iniciativa de governos em n??vel federal e distrital, executada na primeira d??cada do s??culo XXI para qualifica????o de trabalhadores, proclamada como destinada ?? inclus??o social e profissional. Ap??s a an??lise de dados os resultados permitiram constatar que os objetivos da pesquisa foram plenamente alcan??ados, o que possibilitou at?? mesmo tra??ar para o momento presente as caracter??sticas socioecon??mico-demogr??ficas de um educando inscrito no Distrito Federal em um curso de qualifica????o do PlanTeQ no ano a que se refere o estudo.