The amount of interest in asteroids, particularly near-Earth asteroids, has been slowly increasing the last few years. Early on, it was the fear of the potential hazards of an asteroid impact (which still remains); now, science and exploration are driving the motivation for detecting asteroids. By incorporating a process that attempts to remove stars from images, known as difference image analysis, into the shift and stack method for finding moving objects, an algorithm that searches for asteroids in series of images was created. When tested on previously discovered asteroids, the algorithm was able to detect 73% (104 out of 142) of the asteroids, with a false positive occurring in roughly one in six runs. Two of the test asteroids found by the algorithm were not found using a different shift and stack technique. Almost all of the asteroids that the algorithm could not detect were either slow moving, faint or both. The detection capability of the algorithm can easily be improved to be more successful at detecting slow and/or faint asteroids. This can be achieved by using a better method for masking the star residuals or by increasing the time between successive images when searching for asteroids with velocities of 2.4

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-01-12T13:27:26Z No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) filipe_ton_fialho.pdf: 584567 bytes, checksum: c709d14f5ea8f5fe36206a752e8381b4 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-01-12T13:28:04Z (GMT) No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) filipe_ton_fialho.pdf: 584567 bytes, checksum: c709d14f5ea8f5fe36206a752e8381b4 (MD5) / Made available in DSpace on 2016-01-12T13:28:04Z (GMT). No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) filipe_ton_fialho.pdf: 584567 bytes, checksum: c709d14f5ea8f5fe36206a752e8381b4 (MD5) Previous issue date: 2014 / Foi realizado estudo na Fazenda Experimental Risoleta Neves, utilizada pelo conv?nio UFSJ/EPAMIG, para avaliar as caracter?sticas bromatol?gicas de silagens de capim-momba?a acrescidos em n?veis crescentes de res?duo de soja (0, 5, 10, 15 e 20% de res?duo), com a utiliza??o ou n?o de inoculante, e a cin?tica de degrada??o e tr?nsito de part?culas de quatro n?veis de inclus?o do res?duo (0, 10, 15 e 20%). As silagens produzidas foram analisadas quanto ? mat?ria-seca, prote?na bruta pH, fibra insol?vel em detergente neutro e fibra insol?vel em detergente ?cido Para o estudo de cin?tica de tr?nsito e degrada??o foram utilizados quatro animais fistulados no r?men, com peso m?dio de 470 kg, em um quadrado latino (4x4). No estudo da cin?tica de tr?nsito, a fibra em detergente neutro das silagens foi marcada com dicromato de pot?ssio, incubada no r?men, e depois realizou-se amostragens de fezes coletadas direto no reto dos animais, com tempos pr?-determinados. Para o estudo da degrada??o das silagens, as mesmas foram mo?das em peneiras de 5mm, incubadas no r?men nos tempos 0, 6, 18, 48 e 96 horas, em saquinhos de n?ilon. O efeito do res?duo de soja sobre as qualidades nutricionais das silagens foi positivo, mas o efeito do inoculante foi nulo quando n?o houve a inclus?o do res?duo. N?o ? recomendada a adi??o do res?duo de soja em n?veis acima de 10%, pois a partir desta quantidade os padr?es de digest?o e passagem da fibra no r?men-ret?culo s?o prejudicados, e podem ocorrer altera??es no ambiente ruminal que poder?o afetar o aproveitamento da silagem. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2014. / ABSTRACT A study was conducted at the Experimental Farm Risoleta Neves ( FERN ) used by the agreement UFSJ/EPAMIG to assess the qualitative characteristics of silage of Mombasa increased with increasing levels of soybean residue ( 0 , 5 , 10 , 15 and 20 % of waste ) , with or without the use of inoculants and the kinetics of degradation and passage of particles of four levels of inclusion of the residue ( 0, 10 , 15 and 20 %). The silages were analyzed for dry - matter ( DM), crude protein (CP ), pH, neutral detergent fiber ( NDF) and acid detergent fiber ( ADF) . To study the kinetics and degradation transit four animals were cannulated in the rumen, with an average weight of 470 kg in a Latin square ( 4x4 ) . In the study of the kinetics of transit fiber silages was labeled with potassium dichromate, incubated in the fistula, and then by performing direct sampling collected stool in the rectum of animals with predetermined times. To study the degradation of silages, they were ground in 5 mm sieve, incubated in the rumen at 0, 6, 18, 48 and 96 hours in nylon bags. The effect of soybean residue on the nutritional quality of the silage was good, but the effect of inoculant is null when no inclusion of residue. It is recommended the addition of soybean residue at levels above 10 %, because this quantity from the patterns of digestion and passage of fiber in the rumen - reticulum are harmed, and changes in the rumen environment that will affect the use of silage can occur.

Made available in DSpace on 2015-03-03T15:22:33Z (GMT). No. of bitstreams: 1 JoseCRN_DISSERT.pdf: 908143 bytes, checksum: e49901002fbfc242e514099db9428039 (MD5) Previous issue date: 2010-04-16 / Os Algoritmos Gen?tico (AG) e o Simulated Annealing (SA) s?o algoritmos constru?dos para encontrar m?ximo ou m?nimo de uma fun??o que representa alguma caracter?stica do processo que est? sendo modelado. Esses algoritmos possuem mecanismos que os fazem escapar de ?timos locais, entretanto, a evolu??o desses algoritmos no tempo se d? de forma completamente diferente. O SA no seu processo de busca trabalha com apenas um ponto, gerando a partir deste sempre um nova solu??o que ? testada e que pode ser aceita ou n?o, j? o AG trabalha com um conjunto de pontos, chamado popula??o, da qual gera outra popula??o que sempre ? aceita. Em comum com esses dois algoritmos temos que a forma como o pr?ximo ponto ou a pr?xima popula??o ? gerada obedece propriedades estoc?sticas. Nesse trabalho mostramos que a teoria matem?tica que descreve a evolu??o destes algoritmos ? a teoria das cadeias de Markov. O AG ? descrito por uma cadeia de Markov homog?nea enquanto que o SA ? descrito por uma cadeia de Markov n?o-homog?nea, por fim ser?o feitos alguns exemplos computacionais comparando o desempenho desses dois algoritmos

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-09-28T12:19:16Z No. of bitstreams: 1 2014 - Mara Alexandre da Silva.pdf: 458810 bytes, checksum: 70a72dfd6d35926572affcb5392ec6f7 (MD5) / Made available in DSpace on 2017-09-28T12:19:16Z (GMT). No. of bitstreams: 1 2014 - Mara Alexandre da Silva.pdf: 458810 bytes, checksum: 70a72dfd6d35926572affcb5392ec6f7 (MD5) Previous issue date: 2014-08-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Organic production is an alternative for family farmers where practices to reduce costs and to preserve natural resources can add value to the product and improve quality of life. The weeds can cause losses in crops, by reduction of income, increase in pests and diseases, non uniformity in maturity and difficulties for harvesting. The objective of this study was to evaluate the performance of common bean cultivars (Phaseolus vulgaris) at different sowing densities regarding the incidence of weeds in organic production system. Two field experiments were conducted in the Agroecological Production Integrated System of 47 km in Serop?dica-RJ, in the years 2013 and 2014, in a randomized block design with four replications. In 2013 a 4x3 factorial was used, combining four cultivars (Ouro Negro, Manteig?o, Radiante and Apor?) and three densities (8, 13 and 18 plants m-1 linear). In 2014 a 2x3 factorial was used, between two cultivars (Manteig?o and Ouro Negro) and three treatments (13 plants m-1 with manual cleaning of weeds, 13 and 18 plants m-1 without cleaning). To obtain the desired plant population, 50% more seeds were sown in each treatment and plants were thinned 15 days after. Sampling was carried out at the flowering stage to assess biomass and nodulation of bean and biomass of weeds, and at physiological maturity to evaluate grain yield. In 2013, the largest shoot and root dry mass and number of nodules per plant occurred in the density of 8 plant m-1. Increased planting density reduced the number of pods per plant, with no effect of density on grain yield. The lower biomass of weeds was observed at densities of 13 and 18 plant m-1, and also for cutivars Manteig?o and Ouro Negro. In 2014, treatment with 13 plants m-1 with cleaning showed greater dry mass of shoots and roots per plant. At flowering, treatment with 13 plants m-1 showed higher dry matter and number of weeds. The cultivar Ouro Negro showed higher grain yield at density of 13 plants m-1 with cleaning, followed by 18 plants m-1, with no differences between treatments for cultivar Manteig?o. The treatment with 18 plants m-1 showed lower mass of weeds at bean flowering, similar to the treatment with 13 plants m-1 with cleaning. Plots with cultivar Manteig?o had the highest dry matter of weeds in the three density treatments. Grain yield did not differ significantly among cultivars, ranging in 2013 from 1310 kg ha-1 for Apor? and 1409 kg ha-1 for Manteig?o, and in 2014 of 1298 and 1419 kg ha-1 for Manteig?o and Ouro Negro. It is concluded that increasing plant density reduced the incidence of weeds and did not affect grain yield. It was also carried out a field trial in 2013 in family agricultural establishment in the city of Teresopolis-RJ, in order to encourage the cultivation of special beans and to experience economic and social strategies of reproduction. The experiment had a 4x2 factorial with four replications, using four cultivars (Apor?, Manteig?o, Radiante and Valente) and two treatments (with and without commercial inoculant with rhizobia). Grain yield of the four cultivars did not differ between the treatments in the absence and presence of seed inoculation with rhizobia / A produ??o org?nica constitui uma alternativa para a agricultura familiar, onde pr?ticas para diminuir os custos de produ??o e preserva??o dos recursos naturais agregariam valor ao produto e qualidade de vida. As plantas espont?neas podem causar perdas em cultivos, pela redu??o do rendimento, aumento de pragas e doen?as, desuniformidade na matura??o e dificuldades na colheita. O objetivo deste trabalho foi avaliar o desempenho de cultivares de feijoeiro comum (Phaseolus vulgaris) em diferentes densidades de semeadura, com rela??o ? incid?ncia de plantas espont?neas em sistema org?nico de produ??o. Foram conduzidos dois experimentos de campo no Sistema Integrado de Produ??o Agroecol?gica do km 47, em Serop?dica-RJ, nos anos de 2013 e 2014, em blocos ao acaso com quatro repeti??es. Em 2013 foi utilizado esquema fatorial 4x3, combinando quatro cultivares (Ouro Negro, Manteig?o, Radiante e Apor?) e tr?s densidades (8, 13 e 18 plantas m-1 linear) e em 2014 utilizou-se esquema fatorial 2x3, entre duas cultivares (Manteig?o e Ouro Negro) e tr?s tratamentos (densidade de 13 plantas m-1 com limpeza manual de plantas espont?neas, densidades de 13 e 18 plantas m-1 sem limpeza). Para obten??o da popula??o desejada, foram semeadas 50% mais sementes em cada tratamento, e 15 dias ap?s realizou-se desbaste. Foram efetuadas amostragens no est?dio de flora??o para avalia??o de biomassa e nodula??o do feijoeiro e da biomassa de plantas espont?neas, e na matura??o fisiol?gica para avalia??o do rendimento. Em 2013, a maior massa seca de parte a?rea e raiz e n?mero de n?dulos por planta ocorreu na densidade de 8 plantas m-1. O aumento da densidade de plantio reduziu o n?mero de vagens por planta, sem efeito da densidade na produtividade de gr?os. A menor massa de plantas espont?neas foi observada nas densidades de 13 e 18 plantas m-1, e com as cultivares Manteig?o e Ouro Negro. Em 2014, o tratamento com 13 plantas m-1 com limpeza apresentou maior massa seca de parte a?rea e raiz por planta. Na flora??o, o tratamento com 13 plantas m-1 sem limpeza apresentou maior massa seca e n?mero de espont?neas. A cultivar Ouro Negro apresentou maior produ??o de gr?os no tratamento de 13 plantas m-1 com limpeza, seguida por 18 plantas m-1, sem diferen?as entre tratamentos na cultivar Manteig?o. O tratamento com 18 plantas m-1 apresentou menor massa de espont?neas na flora??o do feijoeiro, similar a 13 plantas m- 1 com limpeza. A cultivar Manteig?o apresentou maior massa de espont?neas nos tr?s tratamentos. A produ??o de gr?os n?o diferiu significativamente entre as cultivares, variando em 2013 entre 1310 kg ha-1 para Apor? e 1409 kg ha-1 para Manteig?o, e em 2014 com 1298 e 1419 kg ha-1 para Manteig?o e Ouro Negro. Conclui-se que o aumento da densidade de plantio reduziu a incid?ncia de plantas espont?neas e n?o afetou a produtividade de gr?os do feijoeiro. Foi tamb?m conduzido um experimento de campo em 2013 em estabelecimento agr?cola familiar no munic?pio de Teres?polis-RJ, com o objetivo de incentivar o cultivo de feij?es especiais e vivenciar estrat?gias de reprodu??o econ?mica e social. O experimento tinha esquema fatorial 4x2 com quatro repeti??es, entre quatro cultivares (Apor?, Manteig?o, Radiante e Valente) e dois tratamentos (com e sem uso de inoculante comercial de riz?bio). A produ??o de gr?os das quatro cultivares n?o diferiu entre os tratamentos na aus?ncia e na presen?a de inocula??o de sementes com riz?bio.

Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-10-11T20:09:52Z No. of bitstreams: 1 2016 - Liliane de Souza Ferreira.pdf: 1966686 bytes, checksum: eebcf58399ae9c79283075f9e54588e5 (MD5) / Made available in DSpace on 2017-10-11T20:09:52Z (GMT). No. of bitstreams: 1 2016 - Liliane de Souza Ferreira.pdf: 1966686 bytes, checksum: eebcf58399ae9c79283075f9e54588e5 (MD5) Previous issue date: 2016-08-09 / The management of weeds is complex and comprises a major component of the production cost of most cultures. Growing cover crops is one of the forms of management to reduce weeds competing. Agrobiodiversity, including the biota and the surrounding properties, constituting a cultural and natural capital able to provide ecosystem services. In this context, we developed a study to investigate the potential of wild species Crotalaria incana (rattlesnake rattle or Xique-Xique) and Diodia saponariifolia (Poaia the swamp), which occur in a nearby landscape the Atlantic Forest fragments in the River Basin region Guapi-Macacu-RJ, as part of sustainable agro-ecosystems, constituting strategy to reduce the use of herbicides and enhancing local biodiversity. This potential was assessed in C. incana through phenological studies of plant height, crown diameter, number of branches, presence of inflorescence and number of pods along the cycle and at different times, October, January, February and March. Also evaluated in its interaction with the climate and planting dates. It was found that the planting October C. incana had the longest growing season, low seed production. In the planting in February, the performance of C. incana was good in both parameters; while planting in March, C. incana demonstrated lower performance for mass production and seeds. Preliminary assessments of total biomass and macronutrients, indicate the potential of C. incana as a cover crop that needs to be better investigated. As for D. saponariifolia, a creeping species characterized as macrophyte, evaluations were made of soil coverage percentage after its introduction, compared to the most frequently dominant families in the system, Poaceae and Cyperaceae. Subsequently evaluated the seed bank behavior in this same area after being introduced (experimental area), compared to natural area, which was already established spontaneously. We observed a cooling populations of Poaceae and Cyperaceae after the introduction D. saponariifolia. The spontaneous seed bank revealed a reduction in the expression of these families, important competitors in the system. Possible allelopathic effect of D. saponariifolia in suppressing spontaneous, was evaluated by bioassay with the soil of the natural area where D. saponariifolia prevails spontaneously. In this ground sesame seeds were germinated Sesame indicu L. () in 15-cell trays 3 treatments (T1, T2, T3). T1, activated carbon was added to neutralize allelopathic effects harmful to the development of seedlings. T2, do not add anything. In T3 (control) used a soil adjacent area without the presence of individuals D. saponariifolia. There was no significant difference in the development of seedlings in 3 treatments, indicating no evidence of allelopathic effects of D. saponariifolia on Sesame germination. We can infer that the suppression of processes D. saponariifolia are only for "muffling". / O manejo de plantas espont?neas ? complexo e comp?e um dos principais componentes do custo de produ??o da maioria das culturas. O cultivo de plantas de cobertura ? uma das formas de manejo para redu??o das plantas espont?neas competidoras. Neste contexto desenvolveu-se um estudo com objetivo de investigar o potencial das esp?cies espont?neas Crotalaria incana (Xique-Xique) e Diodia Saponariifolia (Poaia do brejo), que ocorrem em uma paisagem pr?xima a fragmentos de Mata Atl?ntica, na regi?o da Bacia do Rio Guapi-Macacu-RJ, como parte integrante de agroecossistemas sustent?veis, constituindo estrat?gia para redu??o do uso de herbicidas e incremento da biodiversidade local. Este potencial foi avaliado em C. incana, atrav?s de estudos fenol?gicos de altura da planta, di?metro de copa, n?mero de ramos, presen?a de infloresc?ncia e n?mero de vagens ao longo do ciclo e em diferentes ?pocas Outubro, Janeiro, Fevereiro e Mar?o). Avaliou-se tamb?m sua intera??o com o clima e ?pocas de plantio. Constatou-se que no plantio de Outubro, C. incana teve o ciclo vegetativo mais longo, com pouca produ??o de sementes. J? no plantio em Fevereiro, o desempenho de C. incana foi bom em ambos par?metros; enquanto no plantio de Mar?o, C. incana demonstrou menor desempenho tanto para produ??o de massa como de sementes. Avalia??es preliminares de macronutrientes totais e biomassa indicam bom potencial de C. incana a ser melhor investigado. Quanto ? D. Saponariifolia, uma esp?cie rasteira caracterizada como macr?fita, foram feitas avalia??es de porcentagem de cobertura do solo ap?s sua introdu??o, comparando com as fam?lias mais frequentemente dominantes no sistema, Poaceae e Cyperaceae. Posteriormente avaliou-se o comportamento do banco de sementes nesta mesma ?rea ap?s ser introduzida (?rea experimental), comparando com ?rea natural onde j? estava estabelecida espont?neamente. Observou-se um arrefecimento das popula??es de Poaceae e Cyperaceae ap?s a introdu??o D. saponariifolia. O banco de sementes de espont?neas revelou uma redu??o na express?o destas fam?lias e de Asteraceae, importantes competidoras no sistema. Poss?vel efeito alelop?tico de D. saponariifolia na supress?o de espont?neas, foi avaliado atrav?s de biosensaio com o solo da ?rea natural, onde D. saponariifolia predomina espontaneamente. Neste solo foram germinadas sementes de Sesamo indicu L. (Gergelim) em bandejas de 15 c?lulas, com 3 tratamentos (T1,T2,T3). Em T1, adicionou-se carv?o ativado, que neutralizaria efeitos alelop?ticos prejudiciais ao desenvolvimento das pl?ntulas. Em T2, n?o se adicionou nada. Em T3 (controle) utilizou-se um solo da ?rea adjacente, sem presen?a de indiv?duos de D. saponariifolia. N?o houve diferen?a significativa no desenvolvimento das pl?ntulas nos 3 tratamentos, indicando n?o haver evid?ncias de efeitos alelop?ticos de D. saponariifolia na germina??o de Gergelim. Podemos inferir que os processos de supress?o de D. saponariifolia sejam apenas por ?abafamento?.

The development of the Surface Albedo Treatment System (SATS) onboard a spacecraft mission to the near earth asteroid (NEA) Apophis in 2012 is an innovative concept of deflecting NEAs from possible impact with the Earth through altering the Yarkovsky effect, a non-secular force in the solar system due to uneven surface thermal emission most profoundly affecting small rotating bodies subjected to sunlight. Though this force is small, its magnitude can be dramatic if extended over a period of time and if it uses the close approach of an asteroid near Earth to magnify the perturbation. The payload dispenses colored powder called albedo changing particles (ACPs) onto the surface changing its albedo and indirectly the surface temperature which changes the Yarkovsky effect. This study gives an in-depth description of both computational and experimental parts of the design of this system with primary focus on initial ground test setup. The initial experiments proposed to design the SATS is outlined in detail and justified by the mission criterion of interest as well as modeling the actual dispersal on the surface.

Made available in DSpace on 2014-12-17T14:13:58Z (GMT). No. of bitstreams: 1 ElaineLMB.pdf: 288894 bytes, checksum: f70a81fe61f9c843b53868be13773200 (MD5) Previous issue date: 2007-06-22 / PURPOSE: To evaluate the capacity of clofazimine (CFZ) to control cutaneous activity of systemic lupus erythematosus (SLE), compared with chloroquine diphosphate (CDP). METHODS: A prospective, randomized, controlled, double blind clinical trial was carried out in thirty-three patients with SLE and cutaneous lesions (malar rash and/or discoid lupus and/or subacute cutaneous lupus), after approval by the respective Ethics Committee. Sixteen patients received clofazimine - 100mg/day (CFZ group) and 17 received chloroquine diphosphate - 250mg/day (CDP group), during six months. Both groups applied broad-spectrum sunscreens twice a day. The dose of prednisone was kept stable during the study. Cutaneous lesions were evaluated by 2 blinded observers and photographed at baseline and at months 1, 2, 4 and 6. RESULTS: Thirty-three patients began and 27 completed the 6 months of treatment. The groups were homogeneous and comparable in terms of demographic and clinical characteristics. Five CFZ-patients and one CDP-patients dropped out due to severe flare of disease requiring other treatment. At the end of the study, 12 CFZ-patients (75%) and 14 CDP-patients (82,4%) presented complete or near-complete remission of skin lesions; intention-to-treat analysis showed no significant difference in the response rates between groups. Side effects in both groups were frequent, but patients didn t have to discontinue the drugs. CONCLUSIONS: Clofazimine and chloroquine were effective in controlling cutaneous lesions in SLE patients / Objetivo: Avaliar a efic?cia da clofazimina (CFZ) no tratamento das les?es cut?neas do l?pus eritematoso sist?mico (LES), comparando-a com o difosfato de cloroquina (DFC). M?todos: Ap?s aprova??o pelo Comit? de ?tica em Pesquisa da Universidade Federal do Rio Grande do Norte (UFRN), foi realizado um estudo intervencional duplo-cego, controlado e rand?mico, com 33 pacientes portadores de LES e les?es cut?neas em atividade (eritema malar t?pico e/ou les?o disc?ide e/ou l?pus cut?neo subagudo). Um grupo recebeu 100 mg de CFZ (n=16 pacientes) e o outro grupo recebeu 250 mg de DFC (n=17 pacientes), durante seis meses. Ambos os grupos usaram protetor solar, duas vezes ao dia. Durante o per?odo de observa??o, a dose do corticoster?ide dos pacientes foi mantida est?vel. Resultados: Trinta e tr?s pacientes iniciaram e 27 completaram os 06 meses do estudo. Cinco pacientes do grupo CFZ e um do grupo DFC foram retirados, devido a manifesta??es sist?micas graves do LES, para o tratamento adequado a cada caso. Ao final do estudo, utilizando a an?lise inten??o de tratar , 12 pacientes do grupo CFZ (75%) e 14 do grupo DFC (82,4%) obtiveram melhora completa ou quase completa das les?es cut?neas. Os efeitos colaterais foram freq?entes em ambos os grupos, mas nenhum paciente necessitou interromper o tratamento. Conclus?es: A clofazimina mostrou-se eficaz, semelhante ao difosfato de cloroquina, no controle das les?es cut?neas do LES

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-04-03T21:01:25Z No. of bitstreams: 1 AmandaBezerraDeSousa_DISSERT.pdf: 2922601 bytes, checksum: dca5629f97f38f27ba54c27b72939bee (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-04-07T19:16:39Z (GMT) No. of bitstreams: 1 AmandaBezerraDeSousa_DISSERT.pdf: 2922601 bytes, checksum: dca5629f97f38f27ba54c27b72939bee (MD5) / Made available in DSpace on 2017-04-07T19:16:39Z (GMT). No. of bitstreams: 1 AmandaBezerraDeSousa_DISSERT.pdf: 2922601 bytes, checksum: dca5629f97f38f27ba54c27b72939bee (MD5) Previous issue date: 2017-03-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A ado??o de sistemas de capta??o de ?gua de chuva como fonte de ?gua pot?vel ? uma pr?tica disseminada em diversas partes do mundo. A efici?ncia do sistema est? diretamente ligada ao dimensionamento adequado do reservat?rio. O objetivo desta pesquisa ? delimitar zonas pluviais homog?neas para o Estado do Rio Grande do Norte, avaliar a varia??o de volumes de cisternas com diferentes m?todos de dimensionamento para estas zonas e, por fim, determinar tipologias de volumes de cisternas para regi?es com regimes pluviais semelhantes. Para a delimita??o das zonas pluviais homog?neas foi utilizado a precipita??o m?dia anual e o ?ndice PCD (Precipitation Concentration Degree) que permite estimar a forma como a precipita??o se distribui ao longo dos meses do ano. Os resultados mostraram que a divis?o em 6 grupos homog?neos contempla toda a varia??o das caracter?sticas pluviais para o Estado. Quanto ? avalia??o dos m?todos de dimensionamento, p?de-se concluir que os m?todos Andrade Neto, Rippl, Simula??o, YAS, Pr?tico Australiano e Efici?ncia de 80% s?o apropriados, visto que os m?todos apresentam varia??o dos volumes condizente com a varia??o das caracter?sticas pluviais. Por fim, ? poss?vel estabelecer tipologias de volumes de cisternas que possam atender ?s situa??es diversas que existem na pr?tica. No caso do Estado do Rio Grande do Norte, podem-se utilizar seis volumes de cisternas diferentes: 3, 5, 8, 12, 16 e 18 m?. Apenas 7% das fam?lias avaliadas necessitam de uma cisterna de 16 m? para atender satisfatoriamente ?s suas demandas, isso demonstra que o volume utilizado para todas as situa??es ? o volume adequado para uma pequena parcela das fam?lias, comprovando a necessidade de utiliza??o de volumes distintos. / The adoption of catchment systems of rainwater as source of drinking water is a disseminated practice in many parts of the world. The system efficiency is directly connected to the suitable sizing of the reservoir. The aim of this research is delimit homogeneous pluvial zones to the Rio Grande do Norte State, to assess the variation of volumes of the cistern for regions with similar rain regimes. For delimitation of the homogeneous pluvial zones was used the mean annual precipitation and the PCD (Precipitation Concentration Degree) that allows to estimate the way as the precipitation distributed over the months of the year. The results show that the division in 6 homogeneous groups contemplates all the variation of rainfall characteristics for the. The methods evaluation of the sizing, it cans conclude that the methods Andrade Neto, Rippl Simula??o, YAS, Pr?tico Australiano and Efficiency of the 80% are appropriate, whereas the methods presents variation of the volumes consistent with variation in rainfall characteristics. Lastly, it is possible establish typologies of cistern volumes that can meet the diverse situations that exist in practice. In the case of the State of Rio Grande do Norte, we can used six volumes of different cisterns: 3, 5, 8, 12, 16 e 18 m?. Only 7% of available families need of a cistern of 16 m? for attend satisfactorily their demands, this show that the volume used for all the situations is the adequate volume for a small portion of families, proving the need to use different volumes.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-05T19:41:53Z No. of bitstreams: 1 StefersonAlmeidaAderaldo_DISSERT.pdf: 3479668 bytes, checksum: b286a25753db4bf4b6de3736aeb27914 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-17T23:43:09Z (GMT) No. of bitstreams: 1 StefersonAlmeidaAderaldo_DISSERT.pdf: 3479668 bytes, checksum: b286a25753db4bf4b6de3736aeb27914 (MD5) / Made available in DSpace on 2017-10-17T23:43:09Z (GMT). No. of bitstreams: 1 StefersonAlmeidaAderaldo_DISSERT.pdf: 3479668 bytes, checksum: b286a25753db4bf4b6de3736aeb27914 (MD5) Previous issue date: 2017-07-28 / No Brasil, h? 794.699 km de redes e apenas 12.348 km s?o de redes subterr?neas, ou seja, menos de 2%. Por?m, estima-se que cerca de 30% do total de parques e?licos em opera??o, mais de 3.000MW, foram constru?dos utilizando redes subterr?neas, cujo dimensionamento adequado ? de fundamental import?ncia para o correto funcionamento e a garantia de retorno dos investimentos. Projetos atuais e programas computacionais de suporte a projetos levam em considera??o apenas crit?rios de capacidade de condu??o, queda de tens?o e/ou apresentam as perdas. Esses crit?rios adotam os requisitos m?nimos para o correto funcionamento da instala??o e, consequentemente, o menor custo inicial. No entanto, ao longo da vida do parque, as perdas e custos operacionais podem ser bem maiores, reduzindo os lucros nos demais anos. Devido ?s redes subterr?neas terem alto custo e a necessidade de manter elevados ?ndices de confiabilidade e de opera??o para o seu uso, torna-se necess?rio desenvolver mais ferramentas para o devido dimensionamento, a fim de garantir uma aloca??o otimizada de recursos e uma efici?ncia operacional por meio da redu??o de custos operacionais, aumento da vida ?til, assim como evitar a perda de receita por lucro cessante. Este trabalho tem como objetivo realizar a an?lise dos principais crit?rios t?cnicos e econ?micos para o dimensionamento de redes subterr?neas de m?dia tens?o em parques e?licos, visando a otimiza??o de custo ao longo da vida e melhoria de aspectos t?cnicos, al?m do desenvolvimento de um programa computacional que permita integrar as ferramentas t?cnicas e econ?micas, com uma metodologia espec?fica, baseada em normas para o dimensionamento adequado e otimizado. / In Brazil there are 794,699 km of networks and only 12,348 km are of underground networks, that is, less than 2%, and the others are from overhead electricity distribution networks. However, it is estimated that about 30% of the total wind farms in operation, that is, more than 3,000MW were built using underground networks. The proper sizing of these networks is of fundamental importance for correct functioning and guarantee of return of investments. Current projects and computer programs for project support take into account only criteria for conduction, voltage drop and / or loss of energy. These criteria adopt the minimum requirements for the correct operation of the installation and, consequently, the lowest initial cost. However, during the lifecycle of the windfarm, losses and operating costs can be much higher, reducing profits in other years. Due to this type of network has a high cost and the need to maintain high levels of reliability and operation for its use, it is necessary to develop more tools for proper sizing to ensure optimum resource allocation and operational efficiency, by reducing operational costs, increasing the useful life, as well as avoiding loss of revenue due to lost profits. The objective of the present work is to analyze the main technical and economic criteria for the design of medium voltage underground networks in wind farms aiming at cost optimization throughout life, as well as the development of a computer program that allows integrating the technical and economic tools, with a specific methodology based on norms for the adequate dimensioning.

Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-06-14T19:55:04Z No. of bitstreams: 1 2016 - Jucielle Rocha Ferreira.pdf: 1303291 bytes, checksum: b1975fe6fff5a1d5a4d85aa07760fab8 (MD5) / Made available in DSpace on 2017-06-14T19:55:04Z (GMT). No. of bitstreams: 1 2016 - Jucielle Rocha Ferreira.pdf: 1303291 bytes, checksum: b1975fe6fff5a1d5a4d85aa07760fab8 (MD5) Previous issue date: 2016-03-15 / CNPq / FAPERJ / In organic farming, green manuring and mulching are recommended to maintain or recuperate soil fertility and promote nutrients cycling, besides manage weeds population. Weeds can cause damages to economic crops by competition for water, light and nutrients in cultivated areas. This work aimed to evaluate maize yield and weeds population after green manures cultivation. The experiment was conducted in an Ultisol, placed at Integrated System of Agroecological Production, in Serop?dica, RJ, from October 2014 to June 2015. The experimental design was of randomized blocks, with six treatments and four replications. The treatments involved previous cultivation with sunnhemp (Crotalaria juncea), jack bean (Canavalia ensiformis), velvet bean (Mucuna aterrima), sunflower (Helianthus annuus), sorghum (Sorghum bicolor), and fallow. The green manures were sowed in October, being cultivated during 113 days after sowing. After that, they were cut. Five days after the cut and deposition of the green manures residues in the soil surface, it was sowed maize var. Caatingueiro, adopting spacing of 1,0 m between lines and density of five seeds per linear meter, with a population of 50.000 plants per hectare. Weeds population was evaluated at 15, 30, 45, and 60 days after maize sowing, collecting samples of weeds for identification and quantification of species, and dry biomass production. The obtained data were used for determining of phytosocial indexes. Dry biomass of green manures was greater for the treatments sunnhemp and sorghum. On the other hand, dry biomass of weeds was greater in the treatment velvet bean. Yield of maize without straw; yield of shoot biomass; diameter, length and N contents in grains and shoot did not show significant differences between treatments. Weeds population compositions is influenced by the soil cover crops. The use of sorghum was efficient regarding to biomass production and weeds control. Sunnhemp and sorghum produced biomass values above the recommended amounts for no-tillage system. / Em sistemas org?nicos de produ??o, a aduba??o verde e o uso de cobertura morta s?o recomendados, de forma a manter ou recuperar a fertilidade dos solos e promover a ciclagem de nutrientes, al?m de manejar a popula??o de plantas espont?neas. Esp?cies espont?neas podem causar preju?zos ?s culturas de interesse econ?mico, o que pode ser explicado pela competi??o por ?gua, luz e nutrientes nas ?reas cultivadas. Objetivou-se nesse trabalho avaliar o desempenho agron?mico de milho verde e a din?mica populacional de plantas espont?neas ap?s cultivo de adubos verdes. O experimento foi realizado em um Planossolo, localizado no Sistema Integrado de Produ??o Agroecol?gica, no munic?pio de Serop?dica, RJ, no per?odo de outubro de 2014 a junho de 2015. O delineamento experimental adotado foi de blocos casualizados, com seis tratamentos e quatro repeti??es. Os tratamentos constaram de cultivo pr?vio de crotal?ria (Crotalaria juncea), feij?o de porco (Canavalia ensiformis), mucuna preta (Mucuna aterrima), girassol (Helianthus annuus), sorgo (Sorghum bicolor) e pousio com vegeta??o espont?nea. A semeadura dos adubos verdes foi realizada no m?s de outubro e seu cultivo se deu at? os 113 dias ap?s a semeadura, realizando-se ent?o sua ro?ada. Cinco dias ap?s a ro?ada e deposi??o dos res?duos culturais ao solo, foi realizada semeadura direta do milho variedade Caatingueiro, com espa?amento de 1,0 m entre linhas e densidade de cinco sementes por m-1 linear, totalizando 50.000 plantas por hectare. A popula??o das plantas espont?neas foi avaliada aos 15, 30, 45 e 60 dias ap?s o plantio do milho, atrav?s da coleta de amostras da popula??o espont?nea para identifica??o e quantifica??o das esp?cies e da produ??o da biomassa seca. Os dados obtidos foram utilizados na determina??o de ?ndices fitossociol?gicos. A biomassa seca dos adubos verdes foi maior para os tratamentos crotal?ria e sorgo. Por sua vez, a biomassa seca das plantas espont?neas foi maior na presen?a da cobertura do solo com mucuna preta. Quanto ? produtividade de espigas despalhadas, produtividade de biomassa a?rea do milho, di?metro, comprimento e teores de N no gr?o e na parte a?rea, n?o houve diferen?a significativa entre os tratamentos. A popula??o de plantas espont?neas foi influenciada em sua composi??o, em fun??o dos adubos verdes cultivados. A cobertura com sorgo mostrou-se eficiente quanto ? produ??o de biomassa vegetal e controle de plantas espont?neas. A crotal?ria e o sorgo atingiram quantidade de biomassa acima da recomendada para adequada implanta??o do sistema plantio direto.