Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-02-09T19:35:26Z No. of bitstreams: 1 2016 - Camila Gomes Nunes.pdf: 4871207 bytes, checksum: 62e59136c5dda645d85ce86beadae3ca (MD5) / Made available in DSpace on 2017-02-09T19:35:26Z (GMT). No. of bitstreams: 1 2016 - Camila Gomes Nunes.pdf: 4871207 bytes, checksum: 62e59136c5dda645d85ce86beadae3ca (MD5) Previous issue date: 2016-08-22 / Despite the nutritional and functional value the fruits of jamel?ozeiros (Syzygium Cumini L. Skeels) known as jamel?es are little consumed. In harvest seasons, production is abundant, however, there is no rational use of the fruit. The pulp of this fruit has a high content of anthocyanin, which gives it high antioxidant potential. The practice of physical exercise generates free radicals in the body, which has the antioxidant defense system; the effectiveness of this system is modulated by the intake of nutrients and other compounds with antioxidant potential, as presents in Jamel?o. The aim of the paper was develop energy drink, formulation for use with Jamel?o pulp and mix of carbohydrates, 100% natural, without colorings and flavorings. 11 formulations were produced according to the RDC / ANVISA n?18/2010, with variations in pulp content and mix of carbohydrates. The samples were subjected to sensory evaluation by the acceptance method with consumers and 4 samples with higher averages passed new sensory analysis by athletes, acceptance method and were also submitted to: physical analysis, chemical and physico-chemical, antioxidant activity by methods DPPH, anthocyanin content and content of phenolic compounds. The formulations 4,5,8 and 11 obtained the highest average with consumers and the sample 11 to greater acceptance by athletes. The sample 8 had higher anthocyanin content differing from the other. The sample 4 and 5 showed higher levels of phenolic and the sample 4 presented the highest antioxidant activity. In conclusion, the beverage had high and satisfactory levels of antioxidants and good acceptance by athletes. Therefore, the production of energy and functional drink for athletes and favors the development of new products using Jamel?o must be encouraged and exploited. / Apesar do valor nutricional e funcional, os frutos dos jamel?ozeiros (Syzygium Cumini L. Skeels) conhecidos como jamel?es, s?o pouco consumidos. Nas ?pocas de safra, a produ??o ? abundante, no entanto, n?o h? uso racional do fruto. A polpa desse fruto apresenta alto teor de antocianinas, que lhe confere alto potencial antioxidante. A pr?tica de exerc?cios f?sicos gera radicais livres no organismo que conta com o sistema de defesa antioxidante, a efic?cia desse sistema ? modulada pela ingest?o de nutrientes e outros compostos com potencial antioxidante, como os presentes no jamel?o. Desenvolver formula??o de bebida energ?tica pronta para consumo com polpa de jamel?o e mistura de carboidratos, 100% natural, sem corantes e aromatizantes. Foram produzidas 11 diferentes formula??es conforme a RDC/ANVISA n?18/2010, com varia??es no teor de polpa e do mix de carboidratos. As amostras foram submetidas a an?lise sensorial pelo m?todo de aceita??o com consumidores e as 4 amostras com maiores m?dias passaram por nova an?lise sensorial pelo m?todo de aceita??o com atletas e foram submetidas tamb?m a: An?lise f?sica, qu?mica e f?sico-qu?mica, atividade antioxidante pelos m?todos DPPH, teor de antocianinas e teor de compostos fen?licos totais. As formula??es 4,5,8 e 11 obtiveram as maiores m?dias com os consumidores sendo a amostra 11 a de maior aceita??o pelos atletas. A amostra 8 apresentou maior teor de antocianina diferindo das demais. As amostra 4 e 5 apresentaram maiores teores de compostos fen?licos sendo a amostra 4 a que apresentou maior atividade antioxidante. Em conclus?o, a bebida desenvolvida apresentou teores elevados e satisfat?rios de compostos antioxidantes e boa aceita??o entre os atletas. Logo, a produ??o de uma bebida energ?tica e funcional para atletas ? favor?vel e o desenvolvimento de novos produtos envolvendo o jamel?o como mat?ria-prima devem ser incentivados e explorados.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-10T19:03:35Z No. of bitstreams: 1 BrunoFerreiraAmorim_TESE.pdf: 4546675 bytes, checksum: f3babdd1005205365d367583411ae46c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-13T20:09:02Z (GMT) No. of bitstreams: 1 BrunoFerreiraAmorim_TESE.pdf: 4546675 bytes, checksum: f3babdd1005205365d367583411ae46c (MD5) / Made available in DSpace on 2016-06-13T20:09:02Z (GMT). No. of bitstreams: 1 BrunoFerreiraAmorim_TESE.pdf: 4546675 bytes, checksum: f3babdd1005205365d367583411ae46c (MD5) Previous issue date: 2015-12-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / As ferritas de cobalto-mangan?s (Co1?xMnxFe2O4 e Co1,2Fe1,8?xMnxO4) possuem uma estrutura do tipo espin?lio mista, e t?m sido consideradas como um das candidatas competitivas para grande variedade de aplica??es em dispositivos, desde a gera??o e detec??o de ultra-som, sensores, transformadores, bem como na ind?stria m?dica. Ferritas de cobaltomangan?s nanoestruturadas foram produzidas via moagem de alta energia, com subsequente tratamento t?rmico, e foram caracterizados por difra??o de raios X, fluoresc?ncia de raios X, microscopia eletr?nica de varredura e magnetiza??o. Amostras do tipo Co1?xMnxFe2O4 e Co1,2Fe1,8?xMnxO4 foram obtidas a partir dos p?s precursores Fe3O4, Co3O4 e Mn3O4, os quais foram estequiometricamente misturados e mo?dos por 10h e tratados termicamente ? 900?C por 2h. A difratometria confirma a forma??o das fases nanocristalinas puras para s?rie Co1,2Fe1,8?xMnxO4 com umdi?metro m?dio de cerca de 94nm. Verificou-se que o par?metro de rede aumenta com a substitui??o do Fe3? pelo Mn3?. A fluoresc?ncia de raios X revelou que as por??es de metais nas amostras estavam pr?xima das composi??es estequiom?tricas nominais. As caracter?sticas microestruturais observadas nas micrografias demonstraram que as part?culas formadas apresentam morfologia e granulometria bastante distintas. As medidas de histerese magn?ticas realizadas em baixa temperatura, mostraram que a magnetiza??o de satura??o e reman?ncia aumentaram com a concentra??o de mangan?s, enquanto que o campo coercivo diminuiu. A constante de anisotropia (Ke f ), foi calculada a partir dos ajustes dos dados pela lei de aproxima??o de satura??o. Verificou-se que a anisotropia diminui substancialmente com a substitui??o do ferro pelomangan?s. / The cobalt-manganese ferrites (Co1?xMnxFe2O4 and Co1,2Fe1,8?xMnxO4) has a mixed structure of spinel type and it has been regarded as one of candidates for petitive wide variety of applications in devices from ultrasonic generation and detection, sensors, transformers, as well as in medical industry. Ferrites cobalt-manganese nanostructured were produced via mechanical alloying with subsequent heat treatment and were characterized by X-ray diffraction, X-ray fluorescence, scanning electron microscopy and magnetization. Samples of Co1?xMnxFe2O4 and Co1,2Fe1,8?xMnxO4 were obtained from the precursor powders Fe3O4, Co3O4 and Mn3O4 which were stoichiometrically mixed and ground by 10h and heat treated at 900?C for 2h. The diffraction confirmed the formation of the pure nanocrystalline phases to series Co1,2Fe1,8?xMnxO4 with an average diameter of about 94nm. It was found that the lattice parameter increases with the substitution of Fe3? by Mn3?. The x-ray fluorescence revealed that the portions of metals in samples were close to the nominal stoichiometric compositions. The microstructural features observed in micrographs showed that the particles formed show very different morphology and particle size. The magnetic hysteresis measurements performed at low temperature showed that the saturation magnetization and remanence increased as the concentration of manganese, while the coercive field decreased. The anisotropy constant (Ke f ), was estimated from the data adjustments the law of approaching saturation. It was found that the anisotropy decreases substantially with the substitution of Fe by Mn.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-09T19:50:48Z No. of bitstreams: 1 LeonardoLinharesOliveira_TESE.pdf: 68488662 bytes, checksum: de2543920cd8d7f953cc8b1b5d1ebf66 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-13T19:10:14Z (GMT) No. of bitstreams: 1 LeonardoLinharesOliveira_TESE.pdf: 68488662 bytes, checksum: de2543920cd8d7f953cc8b1b5d1ebf66 (MD5) / Made available in DSpace on 2017-03-13T19:10:14Z (GMT). No. of bitstreams: 1 LeonardoLinharesOliveira_TESE.pdf: 68488662 bytes, checksum: de2543920cd8d7f953cc8b1b5d1ebf66 (MD5) Previous issue date: 2016-06-23 / Nanopart?culas bi-magn?ticas t?m se mostrado promissores em v?rias aplica??es tecnol?gicas, tais como produ??o de ?m?s permanentes, desenvolvimento de geradores de micro-ondas, nano osciladores e sistemas para grava??o magn?tica. Apresentamos um estudo te?rico acerca de nanoestruturas bimagn?ticas do tipo n?cleo@casca constitu?da de materiais ferromagn?ticos de alta e baixa anisotropia. O presente trabalho analisou nanopart?culas com geometria esf?rica e cil?ndrica. Part?culas com formato esf?rico pode ser empregada como pe?a fundamental na constru??o de im?s permanentes de alto desempenho, pois podem apresentar melhorias expressivas no produto energ?tico m?ximo, (BH)max, do sistema. O (BH)max ? um par?metro chave, pois determina se um material ? considerado bom para im? permanente. Nossos resultados mostram que o (BH)max pode ser melhorado significativamente, uma part?cula SmCo5 com 3,5 nm de di?metro recoberta por uma casca de Ferro de 2,5 nm de espessura pode apresentar (BH)max cerca de 4 vezes maior que a part?cula n?o recoberta. No entanto, para um n?cleo de mesmo material, com di?metro muito superior e cascas de Ferro relativamente espessas h? uma redu??o do (BH)max que inviabiliza seu uso para a fabrica??o de ?m?s permanentes. Discutiremos nesse trabalho o comportamento do produto energ?tico destes sistemas. Nanoestruturas com geometria cil?ndrica apresentam diversas aplica??es, como nano osciladores e mem?rias magn?ticas. Dessa forma, conhecer o perfil magn?tico e o comportamento da magnetiza??o no processo de desmagnetiza??o ? de grande relev?ncia. Um cilindro de Permalloy pode com di?metro de 57,0 nm e altura de 21,0 nm apresentar ao longo de sua curva de magnetiza??o o estado v?rtice. A inibi??o deste estado ? relevante para algumas aplica??es e pode ser alcan?ada com a presen?a de um anel externo de um material com momento magn?tico elevado. Do mesmo modo, pode apresentar v?rtice na curva de magnetiza??o devido a presen?a do anel magn?tico. Estudamos ainda os estados magn?ticos presentes em an?is devido a intera??o magn?tica dipolar com o n?cleo. / Bi-magnetic anoparticles has been shown promises in several tachnological applications, such that permanent magnets, microwave generators devices, nanooscilators and magnetic record system for example. We presents a theoretical study about bi-magnetic core@shell nanoparticles consisting of high and low anisotropy ferromagnetic materials. The present work has analyzed nanoparticles with spherical and cylindrical geometries. Spherical particles can be employed as building block for high performance magnets, because can presents a expensive improvement in high energy product, (BH)max, of the system. The (BH)max is a key parameter, because it?s indicate if a material is good to permanent magnets. Our results show that (BH)maxcan be improved significantly, a particle of SmCo5 with 3.5 nm recovered by iron shell with 2.5 nm thickness can presents (BH)max thereabout 4 times great then uncovered particle. In other way, a core of the same material, with major diameter s relative thick shell there is a reduction in (BH)max that unfeasible their use in production of permanent magnets. We discuss in the present work the behavior of energy product these systems. Nanostructures with cylindrical geometries presents several applications, such that nano-oscillators and magnetic memory. In this way, know the magnetic profile and behavior of magnetization in demagnetizing process is relevant. A permalloy cylinder can, with 57.0 nm diameter and 21.0 nm height, presents along your magnetization curve, a vortex state. The inhibition of this state is relevant for some applications and can be reached with a presence of an external ring with elevated magnetic moment material. In the same way, can present vortex in magnetization curve by magnetic ring presence. We study further the magnetic states existing in magnetic ring due to magnetic dipolar interaction with a core.