Showing papers by "Federal University of Roraima published in 2010"

Rising powers, shrinking planet: the new geopolitics of energy

Abstract: A constituição da vida internacional, em seus aspectos primordiais como habitação, produção de alimentos, manutenção do funcionamento da economia e o estabelecimento dos fluxos de transporte e comunicação, depende dos insumos energéticos como sua força motriz. A nova sociedade da informação e a tradicional política de poder das Grandes Potências, com seu aparato industrial-militarista, tornaram-se reféns dos recursos energéticos. Como conseqüência, a ordem internacional neste século 21 vem adquirindo um perfil peculiar, com duas características: o encolhimento do planeta e a ascensão de novos poderes. A conexão entre estes dois fenômenos é atribuída por Michael T. Klare ao papel da energia como pivô nos assuntos internacionais da atualidade. Diretor do Five College Program in Peace and World Security Studies at Hampshire College in Amherst, Michael T. Klare tem se destacado nos estudos sobre o papel do petróleo na política internacional, política externa energética e guerras por recurso, com uma abordagem marcadamente estratégica e geopolítica. Assim, a principal contribuição desse novo livro é aprofundar o debate e atualizar as discussões sobre a problemática energética mundial. Apresenta uma visão de mundo condizente com os anseios e preocupações da sociedade global, com o crescimento da demanda energética por nações de grande porte como China, Índia e Brasil e evidencia a provável escassez de recursos vitais como petróleo, gás e minérios em geral. Busca, em suma, intensificar o debate sobre o papel das potências e de empresas nacionais e multinacionais na conformação de uma ordem energética internacional. Em termos de fontes, o autor trabalha com dados recentes, retirados de instituições dedicadas a monitorar o setor energético de países e regiões do mundo, como empresas multinacionais (BP), organizações internacionais (AIE, AIEA, OPEP), agências governamentais (USDoE) e organizações não-governamentais. Do ponto de vista metodológico, Michael T. Klare faz análises de conjunturas e criação de cenários a partir do acompanhamento da mídia corrente, utilizandose de premissas geopolíticas, pressupostos teóricos e conceitos realistas, respaldados em contextualizações históricas. Para tanto, o autor divide a obra em nove capítulos que tratam de maneira geral da nova geopolítica da energia nas relações internacionais. No primeiro capítulo, Altered states, um processo de exaustão da matriz energética de combustíveis fósseis, já bem encaminhado, faz com que a era do petróleo fácil (easy oil) seja paulatinamente substituída pela era do petróleo difícil (tough oil), na qual a extração torna-se crescentemente mais difícil e onerosa. Um dos resultados é uma luta feroz entre novos consumidores de energia dependentes de fontes tradicionais. O segundo capítulo, Seeking more, finding less, aborda a corrida por recursos entre países, baseada na percepção de que os estoques de commodities energéticas estão encolhendo. Nesse sentido, a dispoRESENHA Rising powers, shrinking planet: the new geopolitics of energy*

Diversidade de Leguminosae em uma área de savana do estado de Roraima, Brasil

Abstract: Leguminosae is the most diverse family in the savannas of Roraima, which are the largest savanna areas in the Brazilian Amazon. This paper presents a floristic survey and an analysis of the geographic distribution patterns of Leguminosae taxa in a savanna area at Boa Vista, Roraima (02o52´07´´N; 60o43´03´´W). The survey identified 80 taxa belonging to 38 genera. Six taxa are new records for the flora of Roraima. The best-represented genera were Aeschynomene and Chamaecrista, both with seven species each. Leguminosae-Papilionoideae was the most diverse subfamily based on the number of genera (24) and infrageneric taxa (53). The phytogeographical analysis revealed predominance of taxa with a Neotropical distribution. The savanna site analyzed represents a legume diverse area, because it concentrates 87% of legume diversity referred for the savannas of Roraima.

Epidemiology and economic impact of cervical cancer in Roraima, a Northern state of Brazil: the public health system perspective

Abstract: OBJETIVO: avaliar a incidencia e o impacto economico direto do câncer de colo de utero (CCU) em Roraima, no ano de 2009, e analisar o perfil epidemiologico e socioeconomico das pacientes portadoras dessa doenca. METODOS: os laudos histopatologicos emitidos em Roraima em 2009 foram revisados, assim como os prontuarios de pacientes femininas em tratamento oncologico. Foram registrados dados clinicos e procedimentos medicos (terapeuticos e diagnosticos) realizados em pacientes portadoras de CCU no unico centro de tratamento oncologico do Estado de Roraima. Portadoras de CCU tratadas no Sistema Unico de Saude (SUS) de Roraima foram submetidas a entrevista abordando temas socioeconomicos e fatores de risco. RESULTADOS: registramos 90 casos de CCU e lesoes pre-malignas de alto grau. Roraima possui a maior incidencia de CCU do Brasil (46,21 casos/100.000 mulheres), sendo 3 vezes mais incidente que o de mama e comparavel a paises subdesenvolvidos de baixa renda. O perfil epidemiologico revela pacientes com privacao economica, socialmente desfavorecidas, baixa escolaridade, sexarca precoce (media de 13,8 anos), multiparidade (media de 5,5 gestacoes). Das pacientes estudadas, 71,7% nunca haviam realizado o teste de Papanicolaou, e o desconhecimento foi o motivo mais relatado (47,4%). Como problema de saude publica, o manejo do CCU gera gastos anuais diretos de mais de R$ 600 mil, com custo medio por paciente de R$ 8.711,00. CONCLUSOES: o CCU e o câncer mais incidente em mulheres roraimenses e um grave problema de saude publica no Estado. Seu elevado impacto economico favorece a implantacao de medidas preventivas do ponto de vista de custo-efetividade. O perfil da pacientes revela a ineficiencia dos servicos preventivos em alcancar pacientes com perfil de exclusao socioeconomico e alto risco para o câncer de colo uterino.

Resposta do feijão-caupi à doses e formas de aplicação de fósforo em Latossolo Amarelo do Estado de Roraima

Abstract: Phosphorus fertilization and ways of phosphate fertilizers application are important factors considering crop management. This study aimed at assessing the effect of phosphorus rates and phosphate fertilizers application forms on growth and phosphorus uptake of cowpea plants cropped on cerrado soil in the State of Roraima, Brazil. An experiment took place under field conditions, on a Yellow Latosol, at Cauame Campus of Roraima's Federal University, located in the municipality of Boa Vista/RR. The experimental design was split-plot, in a completely randomized blocks, with three replicates. The plots consisted of the following phosphoric fertilizers application forms: a) broadcasting; b) single furrow and c) double furrow. Sub-plots corresponded to phosphorus doses: 0, 0,5; 1,0; 1,5, and 2,0 times the recommended dose for cowpea maintenance fertilization (60 kg ha-1 of P2O5). There was a significant effect of P rates over plant growth and plant uptake. Application of fertilizer in double furrows promoted higher plant growth, grain yield, and plant phosphorous uptake.

Formas de aplicação de nitrogênio em três cultivares de girassol na savana de Roraima

Abstract: , nao havendo superioridade dos hibridos Agrobel 960 e Ag robel 962 em relacao a variedade Embrapa 122/V2000. Palavras-chave - Helianthus annuus L. Adubacao Nitrogenada. Savana. Plantas-efeito nitrogenio. Abstract - Nitrogen is the nutrient that limits most the production in the culture of sunflower (Helianthus annuus L). The nutritional requirements among cultivars of the same species is distinct, under the same conditions of culture and for the same agricultural year. With the objective of evaluating four different ways of nitrogen application in the production components of different genotypes of sunflower, an experiment was carried out in a randomized block design in a 3 x 4 factorial scheme (genotypes x ways of nitrogen applying) with four replicates . The treatments consisted on the combination of three varieties: Agrobel 960, Agrobel 962 and V - 2000 and four different ways of nitrogen application: 100% at 20 days after sowing (DAS) - (0-100-0-0); 30% at sowing and 70% at 20 DAS - (30-70-0-0); 30% at sowing, 30% at 20 DAS e 40% at 40 DAS (30-30-40-0); 20% at sowing, 30% at 20 DAS, 30% at 40 DAS e 20% at 60 DAS (20-30-30-20). Measured variables were: height of the plant, height of the capitulum, diameter of the stem, diameter of the capitulum and achene yield. The ways of nitrogen application affected all components of yield. The N formulation (30-70-0-0) has determined the best results for the variables studied, but the form (30-30-40-0) provided results comparable to treatment (30-70- 0-0); treatments where N was applied as (20-30-30-20) caused decrease in the performance of sunflower for all variables. The varietal effect was observed only for plant height and height of the capitulum. The highest yield of achene achieved was 1.639 kg ha-1, with no superiority for the hybrids Agrobel 960 and 962 in relation to the variety 122/V2000 Embrapa.

Carbon nanotube with square cross-section: An ab initio investigation

Abstract: Recently, Lagos et al. [Nat. Nanotechnol. 4, 149 (2009)] reported the discovery of the smallest possible silver square cross-section nanotube. A natural question is whether similar carbon nanotubes can exist. In this work we report ab initio results for the structural, stability, and electronic properties for such hypothetical structures. Our results show that stable (or at least metastable) structures are possible with metallic properties. They also show that these structures can be obtained by a direct interconversion from SWNT(2,2). Large finite cubanelike oligomers, topologically related to these new tubes, were also investigated.

[Use of an artificial neural network to predict the incidence of malaria in the city of Cantá, state of Roraima].

Abstract: INTRODUCTION: Malaria is endemic in the Brazilian Amazon region, with different risks for each region The City of Canta, State of Roraima, presented one of the largest annual parasite indices in Brazil for the entire study period, with a value always greater than 50 The present study aimed to use an artificial neural network to predict the incidence of malaria in this city in order to assist health coordinators in planning and managing resources METHODS: Data were collected on the website of the Ministry of Health, SIVEP - Malaria between 2003 and 2009 An artificial neural network was structured with three neurons in the input layer, two intermediate layers and an output layer with one neuron A sigmoid activation function was used In training, the backpropagation method was used, with a learning rate of 005 and momentum of 001 The stopping criterion was to reach 20,000 cycles or a target of 0001 The data from 2003 to 2008 were used for training and validation The results were compared with those from a logistic regression model RESULTS: The results for all periods provided showed that the artificial neural network had a smaller mean square error and absolute error compared with the regression model for the year 2009 CONCLUSIONS: The artificial neural network proved to be adequate for a malaria forecasting system in the city studied, determining smaller predictive values with absolute errors compared to the logistic regression model and the actual values

Carbon Nanotube with Square Cross-section: An Ab Initio Investigation

Abstract: Recently, Lagos et al. (Nature Nanotechnology 4, 149 (2009)) reported the discovery of the smallest possible silver square cross-section nanotube. A natural question is whether similar carbon nanotubes can exist. In this work we report ab initio results for the structural, stability and electronic properties for such hypothetical structures. Our results show that stable (or at least metastable) structures are possible with metallic properties. They also show that these structures can be obtained by a direct interconversion from SWNT(2,2). Large finite cubane-like oligomers, topologically related to these new tubes were also investigated.

Eficiência da adubação nitrogenada do tomateiro em duas épocas de cultivo

Abstract: Nitrogen fertilization efficiency in tomato at two sowing times Nitrogen fertilization efficiency of the tomato crop, with organic fertilization, was evaluated in two experiments conducted at two times: spring/summer and autumn/spring. The experiments were carried out at the horticulture experimental field of the Universidade Federal de Vicosa in a Cambic Red-Yellow Argisol. In both times, the applied N doses, in the form of nitrocalcium, were 0.0, 93.3, 187.0, 374.0 and 748.0 kg/ha and the doses of organic fertilization, in the form of cattle manure compost, were 0 and 8 t/ha of dry matter. The experiments were arranged in randomized blocks, in a 5 x 2 factorial design, with four replications. The weight and the number of marketed tomatoes per plant increased with the increase of N level in the soil. The percentage of commercially discarded fruits was larger in the spring/summer than in the autumn/spring. The nitrogen fertilization efficiency in tomato crop is higher in the autumn/ spring than in the spring/summer. In the spring/summer, the efficiency was higher without the addition of organic matter to the soil, whereas in the autumn/spring the opposite took place.

Water use efficiency of cassava plants under competition conditions

Abstract: Objetivou-se com este trabalho avaliar caracteristicas associadas a eficiencia de uso da agua de plantas de mandioca sob competicao ou nao com plantas daninhas. O experimento foi realizado em condicoes de ambiente aberto, sendo as unidades experimentais compostas por vasos de fibra de vidro de 150 dm3preenchidos com Latossolo Vermelho Amarelo, previamente adubado. Os tratamentos consistiram no cultivo de plantas de mandioca isoladas e associadas a tres especies daninhas (Bidens pilosa, Commelina benghalensis e Brachiaria plantaginea). Apos inicio da brotacao das manivas, 15 dias apos o plantio, fez-se o desbaste das plantas daninhas, semeadas no momento do plantio das manivas, deixando-se oito plantas de B. pilosa, quatro de C. benghalensis e quatro de B. plantaginea. Aos 60 dias apos a emergencia (DAE), foram avaliados a condutância estomatica de vapores de agua (Gs), pressao de vapor na câmara subestomatica (Ean), gradiente entre temperatura da folha e do ar (ΔT), taxa de transpiracao (E) e a eficiencia do uso da agua (EUA). A especie B. pilosa demonstrou maior capacidade de afetar o crescimento das plantas de mandioca. B. plantaginea e muito eficiente em utilizar a agua, principalmente por apresentar metabolismo C4 , e se mantem competitiva com a mandioca mesmo sob baixo status hidrico temporario. C. benghalensis, por sua vez, nao e boa competidora por luz e aparentemente nao e causadora primaria do esgotamento da agua no solo. Os efeitos, nesse caso, das plantas daninhas, foram mais associados a competicao. No entanto, eles foram considerados entre moderados a baixos. Isso implica que a competicao estabelecida a nivel experimental foi baixa.

Solos da área indígena Yanomami no médio Rio Catrimani, Roraima

Abstract: Em Roraima, a distribuicao espacial das populacoes indigenas identifica um cenario de busca constante de solos capazes de sustentar uma agricultura itinerante. Este trabalho teve como objetivo estabelecer relacao entre a compreensao dos solos por parte dos Yanomami da regiao do medio Catrimani e o Sistema Brasileiro de Classificacao de Solos, bem como avaliar o seu tipo de uso em funcao de analises quimicas para diagnostico da fertilidade do solo. O trabalho foi executado em duas etapas. A primeira consistiu em visitas a oito malocas para estudar os solos. Foram coletadas amostras em trincheiras ate 1,50 m de profundidade para analise e classificacao dos solos e (em prospeccoes com o trado) nas profundidades de 0-10 a 10-30 cm, em 21 tipos de uso agricola, e da area de floresta para analises quimicas de fertilidade. A segunda fase foi uma oficina, abordando os sistemas de exploracao agricola, com duracao de 20 h. Focalizou-se a discussao sobre a compreensao do meio ambiente (Urihi)(1) e sistemas de producao agricolas e sobre a importância do uso correto do conhecimento dos solos. Os solos sao denominados pelos Yanomami em funcao das caracteristicas morfologicas, pelos teores de materia orgânica e pela presenca de minhocas, e da posicao na paisagem - a escolha para agricultura e fundamentada nessas caracteristicas. As praticas agricolas consistem da derrubada da mata nativa, queima e plantio das culturas em separado. Os solos descritos na area foram: Argissolo Vermelho-Amarelo (Maxita a uuxi wake axi), Argissolo Amarelo (Maxita a axi), Latossolo Amarelo (Maxita a axi) e Plintossolo (Maxita a axi a maamaxipe). O processo de derruba e queima promove um incremento inicial do teor de Ca e K trocaveis e P assimilavel devido a contribuicao das cinzas, o que permite a exploracao das areas por um periodo maximo de tres anos.

Carbono orgânico e biomassa microbiana do solo em plantios de Acacia mangium no Cerrado de Roraima

Abstract: The aim of this study was to evaluate the effects of Acacia mangium plantation in the Roraima's Savanna, on soil organic carbon and soil microbial biomass. Soil samplings were collected on the depths of 0-20 cm and 20-40 cm in two Acacia mangium plantation sites, about five years old, and in two sites of native savanna as reference. One of the A. mangium sites (located at Fazenda Cigolina) was composed by a homogeneous plantation (3.6 m between row and 2.0 m between trees) and, the other one (located at Campo Experimental Agua Boa Experimental - CEAB) was composed by a plantation on which the planting distances had strips of two rows 6 meters apart, 2.5 meters between trees and 30 meters between strips). Soil samples were analyzed regarding soil organic carbon, microbial biomass carbon, soil basal respiration and metabolic quotient, besides soil fertility attributes. Results showed that A. mangium plantations did not provide significant increases of organic carbon on the soil comparing with sites used as reference. However, generally, A. mangium plantation increased soil microbial biomass carbon and reduced metabolic quotient, indicating a possibility of soil organic carbon accumulation in long-term. It was also observed that, soil biomass microbial carbon was higher, followed by smaller metabolic quotient at CEAB A. mangium plantation compared with Cigolina and reference sites, showing that planting design exercised influence on soil microbial biomass.

Novas ocorrências de Rapateaceae para o Brasil

Abstract: Este trabalho apresenta cinco novas ocorrencias de Rapateaceae para a flora brasileira, provenientes do Monte Caburai, Roraima, um tepui de baixa altitude no extremo norte do Brasil. Foram registrados uma especie de Rapatea Aubl., tres de Stegolepis Klotzsch ex Korn, alem de uma especie de Epidryos Maguire, sendo este o primeiro registro do genero para a flora brasileira. Sao apresentadas breves descricoes, ilustracoes, informacoes sobre a distribuicao geografica e habitat das especies, bem como comentarios sobre suas afinidades taxonomicas.

Eficiéncia fotosintética y de uso del agua por malezas

Abstract: The objective of this study was to evaluate characteristics associated with the photosynthetic efficiency and water use of weed species. Treatments were composed by the species Bidens pilosa, Commelina benghalensis and Brachiaria plantaginea, sown individually in the experimental units. The experimental design was in randomized blocks in a 3 x 4 factorial, with three repetitions. Characteristics associated with water use - transpiratory rate (E), stomatal conductance (Gs), vapor pressure in the substomatal chamber (Ean) and water use efficiency (WUE) - as well as photosynthesis - internal leaf CO2 concentration (Ci), CO2 consumed during the evaluation (ΔC),leaves average temperature at evaluation time (Tleaf) and photosynthetic rate (A) - were evaluated. B. plantaginea showed lower E, lower WUE and higher A and Ci, differing from the other involved species. B. pilosa showed lower values of WUE, A and T when compared to the other species. According to the results, it can be concluded that B. plantaginea was more efficient in characteristics related to the photosynthesis, i.e., more efficient use of light. B. pilosa was more efficient in characteristics related to water use.

Quark matter in compact stars

Abstract: Recently reported massive compact stars ( M ∼ 2 M ⊙ ) have provided strong constraints on the properties of the ultradense matter beyond the saturation nuclear density. Therefore, realistic quark or hybrid star models must be compatible with these observational data. Some used equations of state (EoS) describing quark matter are in general too soft and hence are not suitable to explain the stability of high compact star masses. In this work, we present the calculations of static spherically symmetric quark star structure by using an equation of state which takes into account the superconducting colour-flavour locked phase of the strange quark matter. In addition, some fundamental aspects of QCD (asymptotic freedom and confinement) are considered by means of a phenomenological description of the deconfined quark phase, the density-dependent quark mass model. We discuss the influence of the obtained quark matter equation of state on the mass-radius relationship of quark stars. Massive quark stars are found due to the stiffness of the equation of state, when reasonable values of the superconducting gap, taken as a free parameter, are used.

Nodulação do feijão-caupi em função da aplicação de três águas de farinheira.

Abstract: Current research, undertaken at the Embrapa greenhouse in Boa Vista RR Brazil, investigated the influence of three types of wastewaters from homemade Cassava flour production on the nodulation of cowpea (Vigna unguiculata (L.) Walp. ). Assay, a completely randomized design with four replications, consisted of nine treatments with three applications of wastewater (wastewater from fresh cassava dough, wastewater from mixed cassava dough, and wastewater from cassava gum) on two occasions (five days before sowing and ten days after emergence): water application only; with mineral fertilizer and water application only without seed inoculation (control). Analysis comprised stem diameter, number of nodes, chlorophyll content, number and dry weight of nodules, dry mass weight of shoot and dry matter of plant. Results obtained from treatments with 100 m3 ha-1 cassava applied five days before planting were higher than those applied ten days after emergence. Development of nodules and plant growth were lower in the application of cassava wastewater when compared to that in treatment with mineral fertilization. There were no differences in cowpea nodulation when the three types of wastewater from homemade Cassava flour production were compared.

Função renal em cadelas com piometra antes e após ovariosalpingohisterectomia

Abstract: In order to evaluate the renal function of bitches with pyometra, it was analyzed the serum biochemistry before and after ovariohisterectomy of 20 dogs treated at the Veterinary Hospital of the Federal University of Piaui. Animals with more than seven years old and mixed breed were the most affected. The clinical signs most frequently noted was vaginal discharge, characteristic of open cervix pyometra. It was detected normocytic anemia in two moments. It also demonstrated leukocytosis, change common in the disease. Seric levels of urea and creatinine remained increased in some animals, even after surgery, possibly due to renal dysfunction acting concurrently with pyometra. Knowledge of change in indicators of renal function both before and after removal of the uterus is important because allows to select illness bitches, detecting early kidney damage, improving the prognosis and survival of the animal.

Feira de saúde do curso de medicina da UFRR: uma aproximação com a comunidade

Abstract: As Feiras de Saude do curso de Medicina da Universidade Federal de Roraima (UFRR) buscam informar e sensibilizar a comunidade quanto a melhoria da qualidade de vida a partir da prevencao, orientando para a mudanca de habitos de vida e diagnosticando precocemente as doencas a fim de trata-las e cura-las. Alem disso, a UFRR busca se aproximar da populacao boa-vistense por meio desse trabalho de extensao universitaria e da realizacao de um servico de utilidade publica de grande relevância academica e comunitaria. A diversidade das licoes aprendidas, registradas como relatos de experiencias ou como estudos, pelo conjunto de profissionais, gestores, pesquisadores e academicos constituiu um importante estimulo ao debate acerca dos limites e possibilidades do Programa Saude da Familia e da interacao do academico na comunidade.

Decomposition of aquatic macrophytes from Cantá stream (Roraima, Brazil): kinetics approach

Abstract: AIM: This study aimed at describing and comparing the kinetics of aerobic and anaerobic decomposition of Eleocharis interstincta, Nymphaea sp. and Montrichardia arborescens; METHODS: The samples of aquatic macrophytes and water were collected in the Canta Stream (02° 49' 11" N and 60° 40' 24" W), Canta, Roraima, Brazil. The plant material was dried and triturated and for each experimental condition (aerobic and anaerobic) mineralization chambers were prepared with plant fragments and stream water. The volume of evolved gases in anaerobic mineralization was monitored during 78 days, while the oxygen consumption was measured for 121 days; RESULTS: The results of aerobic and anaerobic decomposition were fitted to first-order kinetics model. The oxygen consumption varied from 195.36 mg g-1 (DM) for E. interstincta to 629.46 mg g-1 (DM) for Nymphaea sp. The deoxygenation rate derived from mineralization of M. arborescens was higher (kD: 0.049 day-1), followed by E. interstincta (kD: 0.038 day-1) and Nymphaea sp. (kD: 0.027 day-1). For the anaerobic condition the evolution of gases presented two phases: the consumption and formation. According to temporal variations of mineralized carbon, the anaerobic decomposition of M. arborescens presents the higher mineralization coefficient (0.0047 day-1); followed by Nymphaea sp. (0.0035 d-1) and E. interstincta (0.0017 day-1); CONCLUSION: Based on these results we conclude that during the aerobic decomposition of these macrophytes, the Nymphaea sp. was responsible for the higher oxygen demand and M. arborescens generated the highest amounts of gases during the anaerobic mineralization. On average, the aerobic decay processes were 11-fold faster than anaerobic. Regarding to the materials fluxes in freshwater ecosystems, low rate of decomposition observed in anaerobic process when comparing to aerobic rates reflect that the sediment represent a very efficient sink of carbon in the organic matter cycling.

Anencephalic babies as donors of organs and tissue for transplants: legal, moral and practical possibilities

Abstract: Os exitos recentes dos transplantes terapeuticos fizeram com que o anencefalo fosse cogitado como possivel fonte de orgaos para o atendimento de neonatos. Os primeiros relatos cientificos de sua execucao bem sucedida estimularam discussoes para averiguar as possibilidades morais de sua concessao. Os resultados dessas discussoes produziram dificuldades praticas quase impeditivas para a conversao do neonato anencefalo de potencial para real doador de orgaos. A doacao de celulas-tronco e medula ossea por portadores de anencefalia, surpreendentemente, nao foi ainda granjeada.

A lógica da construção de confiança: relações Brasil-Suriname entre 1975 e 1985

Abstract: Entre 1975 e 1985, observa-se a atuacao do Brasil para assegurar relacoes confiaveis com o Suriname, bem como as primeiras manifestacoes da identidade internacional surinamesa. Destaca-se a missao diplomatica brasileira enviada ao Suriname apos o golpe de Estado de 1982, o qual indicava a possivel "cubanizacao" desse pais.

Avaliação do processo produtivo de polpas de frutas congeladas

Abstract: In Roraima State, the local frozen fruit pulps producers employ artesanal procedures which do not ensure the quality of the final products; even so, this agroindustry segment has been increasing and predominalty among the small companies. The quality of frozen fruit pulps production in Boa Vista/RR was assessed by a technical visit and applying a check list at four selected companies proccessing in natura fruit pulps. Inadequate frozen fruit pulps productive processing at local industries was evidenced, thus being in noncompliace with the legislation in force.

Securitização e dessecuritização da Amazônia contemporânea

Abstract: A dinâmica de securitizacao da Amazonia opoe de um lado o setor ambiental e, de outro, o setor politico.

Two new species of Leptolobium (Leguminosae, Papilionoideae) from Brazil

Abstract: Two new species of Leptolobium from Brazil are described and illustrated. Leptolobium araguaiense, restricted to northern Brazil, is similar to L. panamense, but differs in raceme length, ovary pubescence, flower and bract length, hilum shape, habit, geographical distribution, and preferential habitat. Leptolobium multijugum, from midwestern Brazil, is perhaps most closely related to L. glaziovianum, but it has more numerous leaflets and smaller bracts and bracteoles than any other species in the genus.

Objetos, imagens e sons: a etnografia de Theodor Koch-Grünberg (1872-1924)

Abstract: The article characterizes the ethnological theory and method of Theodor Koch-Grunberg (1872-1924), a German anthropologist who made four visits to Brazil between 1896 and 1924, and who was especially noted for his writings about the Indians of the Rio Negro and Rio Branco, and the ethnographic collections, sound recordings, photography and films made during these journeys. The author relates this documentary material with Koch-Grunberg's ethnographic project within the tradition of German Volkerkunde.

Proto-neutron star formation with delta-resonance matter and trapped neutrinos

Abstract: In the present work we study the equation of state for asymmetric hadronic matter, to be applied in neutron star structure calculation. The delta-rich hadronic stellar matter condensate is studied in the context of mean-field approximation in an extended Walecka's theory version, including the Rarita–Schwinger 3/2-spinor to the hadronic sector. The leptonic sector is also incorporated in beta-equilibrium to the dense stelar medium composition. The role of neutrino trapping for the the formed photo-neutron structure including delta matter in its composition is discussed.

Ambientes Interativos e Colaborativos baseados em Realidade Aumentada aplicados à Educação

Abstract: Resumo: Este trabalho apresenta uma arquitetura para distribuicao de ambientes virtuais de Realidade Aumentada como ferramenta de apoio a projetos de ensino. Assim, para a construcao do prototipo de software, a interface de Realidade Aumentada esta baseada em um estudo de caso que representa uma area especifica do conhecimento, neste caso, a fisiologia vegetal. Desta forma, e criada uma interface de Realidade Aumentada que possibilita a interacao do usuario com o ambiente virtual por meio de menus de interacao e tambem por meio de marcadores. Esta interface e integrada a uma camada de distribuicao. Assim, a camada de distribuicao e implementada seguindo a metodologia cliente/servidor baseada em objetos. Abstract: This work presents an architecture for distribution of virtual environments in Augmented Reality as a tool to support projects in education. Thus, for the creation of the software prototype, the interface of Augmented Reality is based on a study case that represents a specific area of knowledge, in this case the plant physiology. Thus was created an interface of Augmented Reality that enables user interaction with the virtual environment through menus for interaction and also by means of labels. This interface is integrated with a layer of distribution. Thus, the layer of distribution was implemented following the methodology client / server-based objects. With the implementation, the interactions made in an environment are replicated for other environments and vice versa, thereby generating a strong system applicable to education as it can provide multiple views of virtual objects on the real objects.

Exo 0748-676 as a quark star

Abstract: This work shows results for the EXO 0748-676 neutron star structure obtained with the use of a phenomenological quark matter description by taking into account a quark interaction, and observing the asymptotic freedom and the confinement characteristics of the fundamental theory. An appropriated choice of model parameters permit to reach the stability of compact dense stellar objects compatible with the observational data to the neutron star EXO 0748-676. It is assumed a color-flavor locked (CFL) superconducting phase to the ground state of the quark–gluon plasma formed in the object interior. We also discuss the surface properties of these objects, introducing a crust composed by a lattice of neutron-rich nucleus close to the neutron drip line, imbedded in an electron gas.

Um passeio pela história de símbolos que representaram igualdade matemática

Abstract: No presente trabalho, a intencao e apresentar parte da investigacao que desenvolvemos no curso de Mestrado em Educacao da Universidade Federal do Espirito Santo. O objeto central de nossa pesquisa de mestrado foram as relacoes de igualdade matematica e significados a ela atribuidos por professores e alunos de 5a e 6a series do ensino fundamental, no municipio de Vitoria – ES. Alem disso, trouxemos um panorama historico com intuito de refletir sobre construcao e desenvolvimento de simbolos que foram usados para representar a igualdade matematica. Nesse artigo optamos por apresentar um recortedos resultados dessa pesquisa bibliografica. Destacamos, assim, o uso de diferentes simbolos para representar a igualdade matematica e o uso do simbolo “=”, hoje usado exclusivamente para indicar igualdade, com outros significados, como diferenca aritmetica por exemplo. Direcionar-nos-emos, portanto, a relatar esses pontos em destaque na representacao da igualdade matematica no decorrer da historia da matematica entre os seculos XVI e XVIII, por ser um periodo marcado pela transicao da linguagem matematica retorica para a simbolica e pela grande producao de trabalhos no campo da matematica.