Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-19T13:34:44Z No. of bitstreams: 5 ric.pdf: 5207435 bytes, checksum: f03a11b8bcdc89eef456751ccb1f74f2 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-20T10:28:40Z (GMT) No. of bitstreams: 5 ric.pdf: 5207435 bytes, checksum: f03a11b8bcdc89eef456751ccb1f74f2 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Made available in DSpace on 2015-02-20T10:28:40Z (GMT). No. of bitstreams: 5 ric.pdf: 5207435 bytes, checksum: f03a11b8bcdc89eef456751ccb1f74f2 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) Previous issue date: 2013-09-20 / A pesquisa b?sica e aplicada voltada para o conhecimento e produ??o de celulases e xilanases microbianas constituem-se em valorosa a??o para o desenvolvimento de produtos e processos biotecnol?gicos. Estas enzimas t?m sido utilizadas na ind?stria de alimentos, cervejarias, vin?colas, produ??o de ra??o, ind?stria t?xtil e fabrica??o de papel. A demanda por tais catalisadores tem crescido rapidamente, encorajada principalmente pela ind?stria de biocombust?veis, em especial para a produ??o de etanol de 2? Gera??o. Neste contexto, o objetivo deste trabalho foi produzir enzimas celulol?ticas e xilanol?ticas com o uso de fungos filamentosos de ocorr?ncia natural, utilizando res?duos s?lidos da cadeia produtiva do biodiesel como fontes de carbono. Tr?s linhagens de fungos filamentosos isoladas de amostras ambientais foram avaliadas para produ??o de celulases e xilanases. Como par?metro de compara??o, utilizou-se o Trichoderma reesei CCT2768, linhagem conhecida como produtora de celulases. Dentre as linhagens avaliadas, um isolado denominado Aspergillus sp AN1257 foi o que se destacou para a produ??o de enzimas celulol?ticas e xilanol?ticas, superando inclusive a produ??o de celulases por T. reesei nas mesmas condi??es fermentativas. A fonte de carbono que melhor induziu a produ??o das enzimas investigadas pelo Aspergillus sp AN1257 foi a torta de caro?o de algod?o. Em busca da condi??o ?tima para a produ??o das enzimas estudadas foi realizado um planejamento fatorial e posteriormente aplicado um delineamento composto central rotacional (DCCR). Ap?s a aplica??o das condi??es ?timas para a produ??o enzim?tica desejada, o extrato obtido apresentou valores de 3,12 U/mL para atividade endoglucan?sica e 76,4 U/mL para a atividade xilan?sica. O extrato enzim?tico produzido apresentou atividade promissora quando utilizado na hidr?lise de lignocelulose em alguns res?duos agroindustriais. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. / ABSTRACT The basic and applied research focused on the knowledge and production of microbial cellulases and xylanases constitute a valuable action for the development of biotechnology products and processes. These enzymes have been used in the food industry, breweries, wineries, feed production, textile and paper manufacturing. The demand for such catalysts has grown rapidly, encouraged mainly by the biofuels industry, in particular for the production of 2nd Generation ethanol. In this context, the aim of this work was to produce cellulolytic and xylanolytic enzymes using naturally occurring filamentous fungi and solid waste of the biodiesel productive chain as carbon source. Three strains of filamentous fungi isolated from ambient samples have been evaluated for production of cellulases and xylanases. As reference microbial strain, it was used Trichoderma reesei CCT2768, known a good producer of cellulases. Among the strains tested, an isolated named Aspergillus sp AN1257 stood out for the production of cellulolytic and xylanolytic activity, surpassing even the production of cellulases by T. reesei under the same fermentation conditions. The carbon source which better induced the production of the investigated enzymes by Aspergillus sp AN1257 was cottonseed cake. In search of the optimum condition for the production of the investigated enzymes it was performed a factorial design and then it was applied a rotational central composite design (RCCD). After application of optimal condiction for enzyme production, the extract obtained showed values ??of 3.12 U/mL for endoglucanasic activity and 76.4 U/mL for xylanolytic activity. The enzyme extract produced showed promising application when used in the hydrolysis of lignocellulose in some agro-industrial residues.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-19T13:34:44Z No. of bitstreams: 5 tia.pdf: 1423954 bytes, checksum: 51545efc1d46e2caf827b6b93408510c (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-20T10:30:56Z (GMT) No. of bitstreams: 5 tia.pdf: 1423954 bytes, checksum: 51545efc1d46e2caf827b6b93408510c (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Made available in DSpace on 2015-02-20T10:30:56Z (GMT). No. of bitstreams: 5 tia.pdf: 1423954 bytes, checksum: 51545efc1d46e2caf827b6b93408510c (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) Previous issue date: 2013-09-20 / Morangos s?o frutos altamente apreciados pelos consumidores, pelas suas caracter?sticas sensoriais e nutricionais e por promoverem benef?cios ? sa?de humana. No entanto, durante a fase de cultivo, o uso indiscriminado de agrot?xicos na cultura pode tornar os frutos impr?prios para o consumo. Al?m disso, s?o necess?rias ado??o de medidas para prolongar o tempo de vida ?til dos frutos ap?s a colheita. Visando caracterizar a qualidade dos frutos comercializados em Diamantina e tamb?m propor t?cnicas para melhor conserva??o dos morangos no armazenamento p?s-colheita realizou-se este trabalho, que constou de dois experimentos. No primeiro procurou-se identificar e quantificar res?duos dos agrot?xicos nos frutos os quais foram coletados em sete fazendas da regi?o em tr?s ?pocas diferentes. A extra??o dos agrot?xicos da matriz foi realizada por extra??o s?lido-l?quido com parti??o em baixa temperatura (ESL-PBT) e a detec??o e quantifica??o foram feitas por cromatografia gasosa com detector de captura de el?trons. Em 28,57% das amostras n?o foram detectados res?duos dos agrot?xicos azoxistrobina, bifentrina, cipermetrina, clorotalonil, clorpirof?s, difenoconazol, endossulfam, iprodiona, ?-cialotrina e permetrina. Em 33,33% dessas amostras constataram-se res?duos abaixo do limite m?ximo de res?duos (LMR) estabelecido e em 38,10% os n?veis desses res?duos nas amostras foram considerados insatisfat?rios por apresentarem res?duos de produtos n?o autorizados e/ou se autorizados acima do LMR. No segundo experimento avaliou-se o efeito de revestimento de amostras de morango com coberturas comest?veis ? base de amido previamente extra?do de banana verde, quitosana e cloreto de c?lcio no armazenamento refrigerado. Os frutos foram coletados no munic?pio de Datas, MG e submetidos aos seguintes tratamentos: imers?o em solu??es de quitosana (QTS), CaCl2 (Ca), amido de banana (Am), amido e quitosana (AmQTS), quitosana e CaCl2 (QTSCa) , amido e CaCl2 (AmCa), amido, quitosana e CaCl2 (AmQTSCa), al?m do grupo controle (Cte). No tempo inicial e ap?s 3, 6, 9, 12 e 16 dias do in?cio do armazenamento, os frutos submetidos aos diferentes tipos de revestimento sob refrigera??o foram avaliados quanto a perda de mat?ria fresca (%), pH, s?lidos sol?veis (?Brix), acidez titul?vel (em percentual e percentual de ?cido c?trico), teor de vitamina C (mg 100 g-1), compostos fen?licos (g 100 g-1 de ?cido t?nico), flavon?ides (g 100 g-1 de ?cido t?nico), antocianinas (mg 100 g-1), atividade antioxidante total (?M sulfato ferroso g-1 de fruta) e a??cares (g 100 g-1). Foram tamb?m avaliados desenvolvimento de bolores e leveduras e coliformes totais ao longo do armazenamento. Frutos que n?o receberam o revestimento mantiveram suas propriedades f?sico-qu?micas por 11 dias. Ap?s este per?odo de armazenamento houve perdas na qualidade dos frutos. Por outro lado frutos submetidos aos tratamentos quitosana, quitosana-CaCl2 e amido de banana-quitosana-CaCl2 mantiveram suas propriedades f?sico-qu?micas durante o per?odo avaliado (16 dias). Os revestimentos com quitosana mostraram-se, ainda, eficientes na prote??o de crescimento de micro-organismos. Concluiu-se que ? necess?rio conscientizar os produtores e os agentes de fiscaliza??o na utiliza??o sobre o uso inadequado dos agrot?xicos e que no caso do armazenamento dos frutos o envolvimento destes com filmes de quitosana prolongam as suas qualidades nutricionais al?m dificultar o ataque de fungos. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. / ABSTRACT Strawberries fruits are highly appreciated by consumers for their sensory and nutritional characteristics and for promoting benefits to human health. However, during its cultivation, indiscriminate use of pesticides in crop can make the fruits unfit for consumption. Besides, it is necessary the adoption of measures to prolong the life of the fruits after harvest. In order to characterize the quality of the fruit sold in Diamantina, Brazil, and also to propose techniques to improve the conservation of strawberries in post-harvest storage this work was conducted, and carried out in two experiments. In the first, we tried to identify and to quantify pesticide residues in fruits which were collected in seven farms in the region in three different eras. The extraction of pesticides was performed by solid-liquid matrix extraction with partition under low temperature (SLE-LTP) and the detection and quantification were performed by gas chromatography with electron capture detector. In 28.57% of the samples were not detected residues of pesticides azoxystrobin, bifenthrin, cypermethrin, chlorothalonil, chlorpyrifos, difenoconazole, endosulfan, iprodione, ?-cyhalothrin and permethrin. In 33.33% of these samples, there have been noticed residues below the maximum residue limit (MRL) established and in 38.10% of the samples, have been found levels of unauthorized products and / or above MRL. The second experiment evaluated the effect of coating samples of strawberry with previously edible coatings based on starch on extracted from green banana, chitosan and calcium chloride in cold storage. The fruits were collected in the municipality of Datas, MG and subjected to the following treatments: immersion in solutions of chitosan (CTS), CaCl2 (Ca), banana starch (Am), starch and chitosan (AmQTS), chitosan and CaCl2 (QTSCa), starch and CaCl2 (AmCa), starch, chitosan and CaCl2 (AmQTSCa), and the control group (Cte). At baseline and after 3, 6, 9, 12 and 16 days from the beginning of storage, the fruits subjected to different types of coating under refrigeration were assessed for fresh weight loss (%), pH, soluble solids (?Brix), titratable acidity (in percentage and percentage of citric acid), vitamin C (mg 100 g-1), phenolic compounds (g 100 g-1 of tannic acid), flavonoids (g 100 g-1 of tannic acid), anthocyanins (mg 100 g-1), total antioxidant activity (?M ferrous sulphate g-1 fruit) and sugars (g 100 g-1). We also evaluated the development of molds, yeasts and coliforms during storage. Fruits that have not received the coating maintained its physicochemical properties for 11 days. After this storage period there have been losses in fruit quality. Besides, fruits treated with chitosan, chitosan-CaCl2 and banana starch-chitosan-CaCl2 maintained their physicochemical properties during the study period (16 days). The chitosan coating proved also to be effective in protecting the growth of micro-organisms. It was concluded that it is necessary to educate producers and control staff about the inappropriate use of pesticides, and that in the case of storage of fruits their involvement with chitosan films extend its nutritional qualities and protect them against fungal attack.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-19T13:34:45Z No. of bitstreams: 5 fab.pdf: 3600092 bytes, checksum: 62e73afe3033394e17b7ea0fbf24fbf8 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-20T10:44:39Z (GMT) No. of bitstreams: 5 fab.pdf: 3600092 bytes, checksum: 62e73afe3033394e17b7ea0fbf24fbf8 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Made available in DSpace on 2015-02-20T10:44:39Z (GMT). No. of bitstreams: 5 fab.pdf: 3600092 bytes, checksum: 62e73afe3033394e17b7ea0fbf24fbf8 (MD5) license_url: 52 bytes, checksum: 3d480ae6c91e310daba2020f8787d6f9 (MD5) license_text: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) Previous issue date: 2013-02-20 / Eletrodos perme?veis a fluidos (EPF) foram confeccionados mediante a eletrodeposi??o do di?xido de chumbo (PbO2) sobre substratos constitu?dos de tecido de carbono (TC) do tipo sarja empregando-se diferentes condi??es experimentais. Foi investigada a influ?ncia dos diferentes tipos de pr?-tratamento do TC na eletross?ntese dos filmes de PbO2. Os substratos pr?-tratados foram caracterizados empregando-se a t?cnica de voltametria c?clica (VC), enquanto que os filmes de PbO2 suportados sobre o TC pr?-tratado foram caracterizados pelas t?cnicas de difratometria de raios-X (DRX), microscopia ?tica (MO), microscopia eletr?nica de varredura (MEV), e a voltametria. Foi verificado que o pr?-tratamento do TC empegando-se o isopropanol ? o mais apropriado para a eletross?ntese dos filmes de PbO2 visando a obten??o de um EPF. O estudo de caracteriza??o ?ex-situ? (DRX, MO e MEV) revelou que as condi??es experimentais mais satisfat?rias para a forma??o da fase ?-PbO2 sobre o TC pr?-tratado, de modo a se obter um EPF, s?o: pH ? 2; 40 oC ? T < 70 oC, e 40 mA cm-2. O comportamento eletroqu?mico do EPF (TC/?-PbO2) foi investigado na condi??o de ?zero-gap? empregando-se a membrana Nafion? 117 (DuPont) como eletr?lito s?lido e a ?gua destilada como fase l?quida. A an?lise das curvas de polariza??o registradas em condi??es quase-estacion?rias para o processo eletr?dico misto da rea??o de desprendimento de oxig?nio (RDO) acompanhada pela rea??o de forma??o de oz?nio (RFO) revelou a presen?a de duas inclina??es de Tafel distribu?das nos dom?nios dos baixos e dos altos sobrepotenciais. Foi obtido um valor de 16 kJ mol-1 para a entalpia de ativa??o aparente determinada no dom?nio dos elevados sobrepotenciais. O estudo envolvendo a quantifica??o do oz?nio produzido com o anodo do tipo TC/?-PbO2 empregando-se um prot?tipo de reator do tipo filtro-prensa revelou que este tipo de EPF n?o ? adequado para o processo da produ??o eletroqu?mica de oz?nio. Entretanto, a grande estabilidade qu?mica e mec?nica apresentada pelo TC/?-PbO2 aliada ao seu grande sobrepotencial para o processo da RDO permite inferir que reatores do tipo filtro-prensa empregando-se este tipo de anodo s?o bastante promissores para processos de interesse ambiental envolvendo a combust?o de poluentes org?nicos presentes em ?guas. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2011. / ABSTRACT Electrodes permeable to fluids (EPF) were fabricated by electrodeposition of lead dioxide (PbO2) on substrates made of twill type woven carbon (TC) using different experimental conditions. There has been investigated the influence of the different types of pre-treatment on TC in the electrosynthesis of PbO2 films. The pretreated substrates were characterized using the technique of cyclic voltammetry (VC), while the PbO2 films supported on pre-treated TC were characterized by the techniques of X-ray diffraction (DRX), optical microscopy (MO), scanning electron microscopy (MEV) and voltammetry. It was observed that the pre-treatment of TC using isopropanol is the most suitable electrosynthesis of PbO2 films for obtaining an EPF. The characterization study "ex-situ" (DRX, MO e MEV)) revealed that the experimental conditions more suitable for the formation of phase ?-PbO2 on the TC pre-treated in order to obtain an EPF, are pH ? 2; 40 oC ? T < 70 oC, e 40 mA cm-2. The electrochemical behavior of EPF (TC/?-PbO2) was investigated in the condition of "zero-gap" employing the Nafion? 117 membrane (DuPont) as solid electrolyte and distilled water as the liquid phase. The analysis of polarization curves recorded in quasi-stationary conditions for the mix electrode process of from the mixture of oxygen detachment reaction (RDO) accompanied by the reaction of ozone formation (RFO) has revealed the presence of two Tafel slopes distributed in the areas of low and high overpotentials. There was obtained a value of 16 kJ mol-1 for the apparent activation enthalpy determined in the field of high overpotentials. The study involving the measurement of ozone produced in the anode-type TC/?-PbO2 employing a prototype reactor of the filter-press revealed that this type of EPF is not suitable for the process of electrochemical production of ozone. However, the high chemical and mechanical stability provided by the TC/?-PbO2 combined with its large overpotential for the process of RDO allows to infer that reactors of filter-press employing this type of anode are very promising for processes of environmental interest involving the combustion of organic pollutants in waste water.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-22T19:28:11Z No. of bitstreams: 1 MadsonRubemOliveiraSilva_TESE.pdf: 1495464 bytes, checksum: 0d35c3d788f1373d1f29cb97ab81c05a (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-23T23:12:57Z (GMT) No. of bitstreams: 1 MadsonRubemOliveiraSilva_TESE.pdf: 1495464 bytes, checksum: 0d35c3d788f1373d1f29cb97ab81c05a (MD5) / Made available in DSpace on 2016-03-23T23:12:57Z (GMT). No. of bitstreams: 1 MadsonRubemOliveiraSilva_TESE.pdf: 1495464 bytes, checksum: 0d35c3d788f1373d1f29cb97ab81c05a (MD5) Previous issue date: 2015-05-22 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / A equa??o de Einstein com constante cosmol?gica negativa gera um espa?o-tempo d + 1?dimens?es, que denominamos de espa?o anti de Sitter, AdSd+1, que nos referimos de "bulk". O principio hologr?fico afirma que a gravidade qu?ntica sobre o AdSd+1 ? codificada por uma teoria de contorno, uma CFTd. Por exemplo, uma teoria de cordas IIB sobre uma espa?o-tempo assintoticamente AdS5 ? S 5 ? dual a uma teoria de gauge de super Yang-Mills N = 4 SYM no espa?o-tempo de 4?dimens?es. Outro exemplo ? a rela- ??o entre a equa??o de Einstein no "bulk"e a equa??o hidrodin?mica descreve uma teoria efetiva no contorno, o qual denominamos de fluido/gravita??o. Uma extens?o da dualidadeAdS/CFT foi proposta por Takayanagi que denominou de correspond?ncia AdS/BCFT. O contorno do CFT extende-se para o "bulk"e restringe o AdSd+1. Quando impomos a condi??o de Neumann sobre a extens?o do contorno obtemos uma equa??o de movimento din?mica que determina a forma da extens?o. Da perspectiva da correspond?ncia fluido/gravita??o o tensor energia-momento do fluido residindo no contorno ser? a fonte da geometria do "bulk". Ampliando a proposta de Takayanagi para correspond?ncia fluido/gravita??o estudaremos a consist?ncia do AdS/BCFT a temperatura finita ou equivalentemente a geometria de BH no "bulk". / Einstein?s equations with negative cosmological constant possess the so-called anti de Sitter space, AdSd+1, as one of its solutions. We will later refer to this space as to the "bulk". The holographic principle states that quantum gravity in the AdSd+1 space can be encoded by a d?dimensional quantum field theory on the boundary of AdSd+1 space, invariant under conformal transformations, a CFTd. In the most famous example, the precise statement is the duality of the type IIB string theory in the space AdS5 ? S 5 and the 4?dimensional N = 4 supersymmetric Yang-Mills theory. Another example is provided by a relation between Einstein?s equations in the bulk and hydrodynamic equations describing the effective theory on the boundary, the so-called fluid/gravity correspondence. An extension of the "AdS/CFT duality"for the CFT?s with boundary was proposed by Takayanagi, which was dubbed the AdS/BCFT correspondence. The boundary of a CFT extends to the bulk and restricts a region of the AdSd+1. Neumann conditions imposed on the extension of the boundary yield a dynamic equation that determines the shape of the extension. From the perspective of fluid/gravity correspondence, the shape of the Neumann boundary, and the geometry of the bulk is sourced by the energy-momentum tensor T?? of a fluid residing on this boundary. Clarifying the relation of the Takayanagi?s proposal to the fluid/gravity correspondence, we will study the consistence of the AdS/BCFT with finite temperature CFT?s, or equivalently black hole geometries in the bulk.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-02T15:38:56Z No. of bitstreams: 1 VanessaDeSouzaChaves_DISSERT.pdf: 903425 bytes, checksum: 6bbeeaa301d13bdd0a008e4cb3ab2112 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-09T20:59:11Z (GMT) No. of bitstreams: 1 VanessaDeSouzaChaves_DISSERT.pdf: 903425 bytes, checksum: 6bbeeaa301d13bdd0a008e4cb3ab2112 (MD5) / Made available in DSpace on 2017-02-09T20:59:11Z (GMT). No. of bitstreams: 1 VanessaDeSouzaChaves_DISSERT.pdf: 903425 bytes, checksum: 6bbeeaa301d13bdd0a008e4cb3ab2112 (MD5) Previous issue date: 2016-08-22 / A evas?o escolar ? um fen?meno complexo que tem despertado o interesse de investiga??o de estudiosos quanto a sua ocorr?ncia no ensino superior. O seu entendimento est? relacionado a elementos acad?micos, institucionais, sociais e econ?micos. A pesquisa se caracterizou como um estudo de caso nos cursos presenciais de F?sica, Matem?tica e Qu?mica da Universidade Federal do Rio Grande do Norte e se prop?s a identificar, por meio da perspectiva do evadido, os fatores que t?m levado os alunos a se evadirem desses cursos. Considerou-se o conceito que define evas?o como sendo a sa?da do aluno do curso sem t?-lo conclu?do, com foco no grupo de estudantes desligados pelo tipo cancelamento por abandono de curso, cuja defini??o ? estabelecida no Regulamento dos Cursos de Gradua??o, norma que disciplina o ensino de gradua??o na institui??o alvo do estudo. Para conhecer o perfil dos evadidos e os fatores que os levaram ao cancelamento, foram aplicados question?rios online aos estudantes que ingressaram de 2013 a 2015 e tiveram seu curso cancelado por abandono. De um modo geral observou-se respostas positivas em rela??o aos cursos pesquisados, de modo que 63,55% do total fez a escolha motivados por afinidade com a ?rea ou voca??o, 68,23% tiveram sua expectativa parcial ou totalmente atendida; 49,53% avaliaram os docentes como bons e dos 69 que se consideraram aptos a opinar sobre o curr?culo de seus respectivos cursos, 57,97% o julgaram atualizado. Os dados obtidos revelaram que os fatores apontados como os que mais contribu?ram para a desist?ncia do curso foram ?conciliar trabalho e estudo?, no que se refere aos de ordem pessoal ou socioecon?mica; e ?dificuldade em acompanhar algumas disciplinas?, no ?mbito dos fatores de ordem acad?mica/institucional. Esses dois itens foram assinalados, respectivamente, por 53,27% e 40,19% dos participantes. A necessidade de realizar atividades laborais concomitantemente ? gradua??o refletiu-se, entre outras quest?es, na falta de tempo para dedicar-se ao curso, apontada por 56,07% como dificuldade enfrentada ao ingressar no curso. Sem, obviamente, a pretens?o de ter esgotado o assunto, muito pelo contr?rio, compreende-se que este estudo possa se somar a um conjunto de investiga??es que est?o sendo realizadas, de abrang?ncia micro e macro institucional, visando a discutir, compreender e intervir sobre o fen?meno evas?o no contexto do ensino superior, bem como servindo de subs?dio para a manuten??o ou cria??o de a??es que viabilizem a redu??o das taxas de evas?o na UFRN. / The school evasion is a complex phenomenon that has attracted the scholarly research of interest how their occurrence in higher education. Their understanding is related to academic, institutional, social and economic elements. This research was characterized as a study case in classroom courses of Physics, Mathematics and Chemistry of the Universidade Federal do Rio Grande do Norte (Federal University of Rio Grande do Norte) and proposed to identify, through the dropout's perspective, the factors that have led students to evade these courses. It was considered the concept that defines evasion as the output of the course the student without having it completed, focusing on the group of students released by the type of cancellation by abandonment of course, whose definition is set out in Regulation of Undergraduate Programs, a standard that rules undergraduate education in the target institution of the study. To know the profile of dropouts and the factors that led to the cancellation, were applied online surveys to students entering from 2013 to 2015 and had its course canceled by abandonment. Generally it were observed positive responses to the researched programs, so that 63.55% of the total has made the choice motivated by affinity with the area or vocation, 68.23% had partial or fully attended expectations; 49.53% rated the teachers as good and 69 that were considered able to give an opinion about curriculum of their respective courses, 57.97% judged it updated. The data revealed that the factors identified as contributing the most to the withdrawal of the course were "conciliate work and study", in relation to personal or socio-economic order; and "difficult to keep up with some subjects" within the academic / institutional factors. These two items were marked respectively by 53.27% and 40.19% of the participants. The need for labor activities in the same time that graduation reflected, among other questions, the lack of time to devote to the course, mentioned by 56.07% as difficulty faced when entering the course. Without, of course, claim to have exhausted the subject, on the contrary, it is understood that this study can be added to a all body of research being carried out, micro and institutional macro scope, aiming to discuss, understand and act on the phenomenon evasion in the context of higher education and served allowance for maintenance and/or creation of actions that enable the reduction of evasion rates in UFRN.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-06-01T11:43:57Z No. of bitstreams: 1 2015 - T?rcio de Sampaio Triani.pdf: 2326230 bytes, checksum: 297ea4ee1d9f2251260ab1c73fb44502 (MD5) / Made available in DSpace on 2017-06-01T11:43:57Z (GMT). No. of bitstreams: 1 2015 - T?rcio de Sampaio Triani.pdf: 2326230 bytes, checksum: 297ea4ee1d9f2251260ab1c73fb44502 (MD5) Previous issue date: 2015-06-22 / The study of soil water dynamics has been growing across the need to optimize the use of water resources for the maintenance of agricultural productivity. In order to assist this study, different models of soil water dynamics has been created and studied in an attempt to predict situations that empirically become time-consuming and expensive. The soil water dynamics is directly associated with physical and hydric parameters, as well as the soil moisture. To determine the soil moisture, there are techniques that require a large amount of samples, increasing the cost and time required to perform such measurements.This work continues the dissertation of Belleza. A model based on fuzzy rules to estimate the moisture in topsoil from soil texture data, matric potential and amount of organic matter is elaborated. The distinction and analysis made by the model fall under the influence of organic matter on the soil water retention, disregarded by most studies of this type. The data set used for training and validation of the model comes from a research project conducted in the Amazon region, organized in a report funded by Petrobras. The results, obtained by simulation performed in the software Matlab, show that the organic matter has great influence in soil water retention of soils which clay content is under 35%. A significant decrease of total mean error in relation with the work of Belleza, which ignores the influence of organic matter, is observed. The increase in the number of the fuzzy inference system rules also allow a better approximation of the estimated values to the real moisture values. Taking into account the uncertainties inherent to the phenomenon this model is considered appropriate, due to its simplicity and relatively low average of errors, and an evolution in the field of modeling the soil moisture estimation by fuzzy logic. / O estudo da din?mica da ?gua no solo tem sido crescente frente ? necessidade de otimiza??o de uso de recursos h?dricos para a manuten??o da produtividade agr?cola. Como forma de auxiliar esse estudo, diferentes modelos de din?mica da ?gua no solo t?m sido criados e estudados, em uma tentativa de se prever situa??es que empiricamente se tornam demoradas e custosas. A din?mica da ?gua no solo est? associada diretamente a par?metros f?sico-h?dricos do solo, assim como a umidade do solo. Para se determinar a umidade do solo existem t?cnicas que necessitam de uma grande quantidade de amostragens, elevando o custo e o tempo necess?rio para realizar tais medi??es. Este trabalho d? continuidade ? disserta??o de Belleza. ? elaborado um modelo baseado em regras fuzzy para estimar a umidade em camadas superficiais do solo a partir de dados de textura do solo, potencial matricial e quantidade de mat?ria org?nica. A distin??o e an?lise feitos pelo modelo recaem sobre a influ?ncia da mat?ria org?nica sobre a reten??o de umidade pelo solo, desconsiderada pela maioria dos trabalhos deste tipo. O conjunto de dados utilizado para treinamento e valida??o do modelo ? proveniente de um projeto de pesquisa realizado na regi?o amaz?nica, organizado em relat?rio financiado pela Petrobras. Os resultados, obtidos atrav?s de simula??o realizada no software Matlab, demonstram que a mat?ria org?nica possui grande influ?ncia na reten??o de umidade por solos cujo teor de argila esteja abaixo de 35%. ? observada uma redu??o significativa do erro absoluto m?dio total em rela??o ao trabalho de Belleza, que desconsidera a influ?ncia da mat?ria org?nica. O aumento do n?mero de regras do sistema de infer?ncia fuzzy permite tamb?m uma melhor aproxima??o das estimativas do valor real de umidade. Levando em conta as incertezas inerentes ao fen?meno este modelo ? considerado adequado devido a sua simplicidade e m?dia de erros relativamente baixa, e uma evolu??o no campo da modelagem da estimativa de umidade do solo por l?gica fuzzy.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-06-08T12:58:44Z No. of bitstreams: 1 2016 - Alan Jorge Ciqueira Gon?alves.pdf: 2968550 bytes, checksum: c41aeac563a3e880f387fa38231d62f7 (MD5) / Made available in DSpace on 2017-06-08T12:58:44Z (GMT). No. of bitstreams: 1 2016 - Alan Jorge Ciqueira Gon?alves.pdf: 2968550 bytes, checksum: c41aeac563a3e880f387fa38231d62f7 (MD5) Previous issue date: 2015-08-31 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This study aims to improve understanding of studies of conics. For this, we will use as theoretical foundation in the construction of the proposed activities, the geometric constructivist theory of Van Hiele. Moreover, in line with the new teaching, and learning tools, we use a dynamic geometry software, the GeoGebra / Este trabalho tem por objetivo melhorar a compreens?o do estudo de c?nicas. Para isto, usaremos como fundamenta??o te?rica na constru??o das atividades propostas a teoria construtivista geom?trica de Van Hiele. Al?m disso, em conson?ncia com as novas ferramentas de ensino e aprendizagem, utilizaremos um software de geometria din?mica, GeoGebra.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-06-14T11:55:01Z No. of bitstreams: 1 2015 - Victor Arantes Nunes.pdf: 1279853 bytes, checksum: 4e3a1c98a99f707552712a3e8c4868c5 (MD5) / Made available in DSpace on 2017-06-14T11:55:01Z (GMT). No. of bitstreams: 1 2015 - Victor Arantes Nunes.pdf: 1279853 bytes, checksum: 4e3a1c98a99f707552712a3e8c4868c5 (MD5) Previous issue date: 2015-07-30 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This work seeks to highlight the importance of teaching probability in high school subject in which teachers usually have some difficulty in transmitting content to their students. It highlighted the relevance of probability, given its broad scope, either in Statistics, Physics or Engineering. A literature review, which approached the historical side of gambling and have also discussed the theoretical aspects of basic probability, essential for good understanding of the content was performed. Then analyzed thoroughly federal lotteries, as well as its characteristics, basic rules and odds of winning in each of them. Finally, this paper suggests a teaching methodology based on lotteries, with different educational activities, in order to motivate and facilitate the understanding of high school students and encourage teachers, escaping the traditional way of teaching / Esse trabalho procura destacar a import?ncia do ensino de Probabilidade no Ensino M?dio, assunto no qual geralmente os professores tem certa dificuldade em transmitir o conte?do aos seus alunos. ? destacada a relev?ncia da Probabilidade, dado seu vasto campo de aplica??o, seja na Estat?stica, F?sica ou na Engenharia. Foi realizada uma revis?o bibliogr?fica, onde abordou-se o lado hist?rico dos jogos de azar e tamb?m foram discutidos os aspectos te?ricos da probabilidade b?sica, essencial para a boa compreens?o do conte?do. Em seguida, analisou-se minuciosamente as loterias federais, assim como suas caracter?sticas, regras b?sicas e probabilidades de se vencer em cada uma delas. Por fim, o presente trabalho sugere uma metodologia de ensino baseada nos jogos lot?ricos, com atividades pedag?gicas diferenciadas, com o objetivo de motivar e facilitar o entendimento dos alunos do Ensino M?dio, bem como estimular os docentes, fugindo da forma tradicional de se lecionar

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-06-19T12:18:08Z No. of bitstreams: 1 2014 - Ronilson Rodrigues Pinho.pdf: 623700 bytes, checksum: 7bc5eefc4b9dab2877f833cbdab95b9f (MD5) / Made available in DSpace on 2017-06-19T12:18:08Z (GMT). No. of bitstreams: 1 2014 - Ronilson Rodrigues Pinho.pdf: 623700 bytes, checksum: 7bc5eefc4b9dab2877f833cbdab95b9f (MD5) Previous issue date: 2014-10-06 / The Boundary Element Method (BEM) is a computational method for differential equations solutions, formulated in the form of integral domains. Thus, it is applied in Fluid Mechanics, Acoustics, Electromagnetics and Fractures study. The BEM requires discretization only regarding boundary geometry of the problem, but not inside as a whole, reducing the computational effort. In order to reduce computational effort, parallel computing is an efficient form of information processing emphasizing concurrent events exploitation during software execution. This processing status arises primarily due to high computational performance requirements and difficulty in increasing single processor core speed. Despite central processing units (CPUs), whether multiprocessors or multicore processors, are easily found today, several algorithms are not suitable to run on parallel architectures yet. The present study aimed to develop parallelism research, acting in a sequential program, using Fortran 77 language (VERA-TUDELLA, 2003), making numerical analysis of stress and strain 2D specific problems) of Solids Mechanics with BEM, as well as, its clamped and tensioned bar physical representation. This application implementation is intended to exploit the maximum parallelism / O M?todo de Elementos de Contorno (MEC) ? um m?todo computacional para a solu??o de sistemas de equa??es diferenciais, formuladas em forma de integrais. Aplicado na Mec?nica dos fluidos, Ac?stica, Eletromagn?ticos, Estudo de fraturas etc. O MEC requer discretiza??o apenas no contorno da geometria do problema, mas n?o do seu interior como um todo, diminuindo o esfor?o computacional. Com o intuito em diminuir o esfor?o computacional, a Computa??o paralela ? uma forma eficiente de processamento de informa??o com ?nfase na explora??o de eventos simult?neos na execu??o de um software. Ele surge principalmente devido ?s elevadas exig?ncias de desempenho computacional e ? dificuldade em aumentar a velocidade de um ?nico n?cleo de processamento. Apesar das CPUs multiprocessadas, ou processadores multicore, serem facilmente encontrados atualmente, diversos algoritmos ainda n?o s?o adequados para executar em arquiteturas paralelas. O presente estudo objetivou-se com o intuito de prosseguir na pesquisa sobre paralelismo, atuando num programa sequencial, desenvolvido na linguagem Fortran 77 (VERA-TUDELA, 2003), que efetua an?lises num?ricas de problemas espec?ficos tens?o e deforma??o em 2D) da Mec?nica dos S?lidos via MEC com representa??o f?sica da barra engastada e tracionada. A implementa??o da aplica??o, visa explorar o m?ximo o paralelismo

Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2016-08-01T17:07:57Z No. of bitstreams: 1 2011 - Juliana Mariano Torres.pdf: 1156662 bytes, checksum: 6ae713d0002e13c804fc2eba73bd8f5b (MD5) / Made available in DSpace on 2016-08-01T17:07:57Z (GMT). No. of bitstreams: 1 2011 - Juliana Mariano Torres.pdf: 1156662 bytes, checksum: 6ae713d0002e13c804fc2eba73bd8f5b (MD5) Previous issue date: 2011-07-22 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico, CNPq. / The increase in life expectancy is a worldwide occurrence that shows the relative success of public health politics, and Brazil is among the countries where people are living longer and in better physical health. But the increase in life expectancy has a negative effect: the appearance of degenerative diseases typical of old age, including several forms of dementia, like Alzheimer?s Disease (AD) that is certainly the most important. It is an irreversible and progressive disease characterized by neuronal deterioration that results in loss of cognitive functions such as memory, communication skills, judgment and reasoning. Donepezil, rivastigmine and galantamine are medicines used for the treatment of AD and act reversibly inhibiting the acetylcholinesterase (AChE). Evidences suggest that the enzyme butyrylcholinesterase (BChE), closely related to AChE, plays a significant role in AD because it is involved in neural functions such as cholinergic co-regulation and non-cholinergic neurotransmission. The aim of this research is to provide new substances with anticholinesterase action by using ?-carboline derivatives from the natural product harmane and carry out a kinetic study to determine the inhibition profile of the enzymes AChE e BChE, which could help in the discovery of new compounds which could be useful in the treatment of AD. Firstly, a screening was carried out with seven ?-carboline derivatives. In a second stage, a kinetic investigation, employing Ellman?s method, was run with these compounds and all of them presented high anticholinesterase action for both AChE and BChE. All seven derivatives presented a non-competitive reversible inhibition. / Torres, Juliana Mariano. ESTUDO CIN?TICO DA ATIVIDADE ANTICOLINESTER?SICA DE DERIVADOS -CARBOL?NICOS DO PRODUTO NATURAL HARMANA. 2011. Disserta??o (mestrado em Qu?mica Org?nica). Instituto de Ci?ncias Exatas, Departamento de Qu?mica, Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 2011. O aumento da expectativa de vida ? um fen?meno mundial que mostra o relativo sucesso de pol?ticas de sa?de p?blica, e o Brasil se inclui entre os pa?ses em que as pessoas est?o vivendo por mais tempo e em condi??es melhores de sa?de. No entanto, o aumento da expectativa de vida tem como efeito negativo o aparecimento de doen?as degenerativas, t?picas de idades mais avan?adas, incluindo-se as v?rias formas de dem?ncia e entre estas, a mais importante ?, sem d?vida, a Doen?a de Alzheimer (DA), patologia irrevers?vel e progressiva caracterizada pela deteriora??o neuronal que resulta em perda de fun??es cognitivas, tais como mem?ria, capacidade de comunica??o, julgamento e racioc?nio. Para o tratamento da DA s?o utilizados f?rmacos como o donepezil, galantamina e rivastigmina, os quais agem inibindo revers?velmente a acetilcolinesterase (AChE). Evid?ncias sugerem que a enzima butirilcolinesterase (BChE), intimamente relacionada com a AChE, tem um papel significante na DA, uma vez que est? envolvida em fun??es neurais tais como a corregula??o da neurotransmiss?o colin?rgica e n?o-colin?rgica. Esta pesquisa pretendeu estudar novas subst?ncias com a??o anticolinester?sica utilizando derivados -carbol?nicos do produto natural harmana, bem como fazer um estudo cin?tico a fim de descobrir qual o perfil de inibi??o das enzimas AChE e BChE, a fim de buscar novos compostos que poderiam ser ?teis no tratamento dos sintomas da DA. Desta forma, foi efetuada preliminarmente uma triagem com 7 derivados -carbol?nicos e posteriormente foi realizada uma investiga??o cin?tica com estes compostos, uma vez que, todos apresentaram alta a??o anticolinester?sica tanto para AChE quanto para BChE. A cin?tica enzim?tica foi estudada segundo o m?todo de Ellman. Contudo, observou-se que todos os 7 derivados apresentaram uma inibi??o revers?vel n?o competitiva.