Inovações institucionais na pesquisa agrícola na América Latina e no Caribe

PEDRO, Edilson da Silva; SALLES-FILHO, Sergio; MENDES, Paule Jeane. Inovações Institucionais na Pesquisa Agrícola na América Latina e no Caribe. In: SIMPOSIO DE GESTAO DA INOVAÇAO TECNOLOGICA, 24., 2006, Gramado. Anais...Gramado: ANPAD, 2006.

Muitas histórias, uma imagem: a percepção sócio-ambiental de alunos residentes da Escola Agrícola de Jundiaí

Tendo como base os conceitos de espaço, lugar, ambiente e imagem, sob as vertentes da Arquitetura e Urbanismo, Geografia e Psicologia Ambiental, esta pesquisa teve como objetivo averiguar a percepção de estudantes da Escola Agrícola de Jundiaí (EAJ UFRN) a fim de identificar aspectos das interrelações pessoa-ambiente que diferenciam tal escola de outras instituições. A coleta de dados utilizou multimétodos e investigou um grupo de alunos residentes na Escola que cursavam o ensino médio e técnico em agropecuária em 2006, analisando seus discursos, comportamentos e atitudes de modo a identificar os principais elementos da imagem sócio-ambiental da EAJ. Os resultados apontaram locais, práticas sociais e símbolos representativos da instituição, indicando espaços (construídos e naturais) adequados/inadequados às necessidades/expectativas dos estudantes incluindo a ampliação da interdisciplinaridade no conjunto de suas atividades. Além disso, a fim de incrementar a análise sócio-ambiental em instituições que promovem experiências exitosas, recomenda-se que os aspectos cotidiano e tempo sejam mais profundamente investigados em estudos futuros na área

Estudo da síntese e propriedade magnética de ferritas de manganês/cobalto dopadas com níquel

For the chemical method of synthesis of co-precipitation were produced ferrite powders manganese-cobalt equal stoichiometric formula Mn (1-x) Co (x) Fe2O4, for 0 < x < 1, first reagent element using as the hydroxide ammonium and second time using sodium hydroxide. The obtained powders were calcined at 400 ° C, 650 ° C, 900 ° C and 1150 ° C in a conventional oven type furnace with an air atmosphere for a period of 240 minutes. Other samples were calcined at a temperature of 900 ° C in a controlled atmosphere of argon, to evaluate the possible influence of the atmosphere on the final results the structure and morphology. The samples were also calcined in a microwave oven at 400 ° C and 650 ° C for a period of 45 minutes possible to evaluate the performance of this type of heat treatment furnace. It was successfully tested the ability of this group include isomorphic ferrite with the inclusion of nickel cations in order to evaluate the occurrence of disorder in the crystalline structures and their changes in magnetic characteristics.To identify the structural, morphological, chemical composition and proportions, as well as their magnetic characteristics were performed characterization tests of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDX), thermogravimetric (TG), vibrating sample magnetometry (MAV) and Mössbauer spectroscopy. These tests revealed the occurrence of distortion in the crystal lattice, changes in magnetic response, occurrence of nanosized particles and superparamagnetism

Propriedade fotoluminescente da ZrO2: Tb+3, Eu+3, Tm+3 obtida pelo método de polimerização de complexos

Recent studies are investigating a new class of inorganic materials which arise as a promising option for high performance applications in the field of photoluminescence. Highlight for rare earth (TR +3 ) doped, which have a high luminous efficiency, long decay time and being able to emit radiation in the visible range, specific to each element. In this study, we synthesized ZrO2: Tb +3 , Eu +3 , Tm +3 nanoparticles complex polymerization method (CPM). We investigated the influences caused by the heat treatment temperature and the content of dopants in zirconia photoluminescent behavior. The particles were calcined at temperature of 400, 500 and 600 ° C for two hours and ranged in concentration of dopants 1, 2, 4 and 8 mol% TR +3 . The samples were characterized by thermal analysis, X-ray diffraction, photoluminescence of measurements and uv-visible of spectroscopies. The results of X-ray diffraction confirmed the formation of the tetragonal and cubic phases in accordance with the content of dopants. The photoluminescence spectra show emission in the region corresponding simultaneous to blue (450 nm), green (550 nm) and red (615 nm). According to the results, ZrO2 particles co-doped with rare earth ions is a promising material white emission with a potential application in the field of photoluminescence

A Servidão Administrativa e o Estado Regulador: Compatibilidade com o Princípio Constitucional da Legalidade e a Limitação ao Direito Real de Propriedade

The economic changes occurred in the 90s, with the restructuring and privatization of various sectors of the economy have led to a redefinition of the State role, assuming a position of regulator and supervisor of public services in place to direct its role as straight intervenor. It is through the regulatory agencies, autarchies with special legal personality under public law, that the Regulator State will act. In this context, the first objective of this research is to analyze the legality of easements imposed by entities of the Direct Administration and Regulatory Agencies, whose execution is delegated to legal persons of private law, being those public service companies or mixed-economy societies. This examination in question the limits of servitude as a restrictive institute of property rights, observing the principles of function, supremacy of the public interests over the private ones, legality and the separation of powers. Defend the property rights like a fundamental right and your insurance as determining factor of economic development and social justice. Use the procedure in use will be the historiccomparative procedure, in order to demonstrate the legality of the public act as a maximum attempt to preserve the balance between the expansion of public services in various sectors of the economy, and the preservation of property rights, through regulation

O impacto do pagamento da participação sobre a produção de petróleo e gás natural sobre a renda familiar e a propriedade no Município de Governador Dix-Sept Rosado no período de 1998 a 2004

This scientific study deals about the oil and natural gas production participation payment impact in the county of Governador Dix-sept Rosado, Rio Grande do Norte, between 1998 to 2004, applied to family income and property. To do so, this analysis focus on the ricardian´s theory exposition which merges from the concept of the mineral income, in concern to the legal establishment of royalties. This paper also shows the world evolution oil exploration, inserting Brazil in this scene as a oil and natural gas producter. It identifies the productive site of oil and natural gas in Rio Grande do Norte as the Potiguar Oil Area, characterizing its components in the demographic, physical and social aspects, to reflect in the focus point of observation which is the Governador Dix-sept Rosado county. The participation payment on oil and natural gas is demonstrated in a qualitative analysis both in Brazil as in Rio Grande do Norte. The payments given to the land owners in this federative unity are shown in the period of analysis of this essay. The study tells, based in a field research, the benefaction impact of the payment to the land owners over the income and property. The family income were highly impacted, causing economic social classes change to some land owners. The property had less or none impact. It was found negative externalities as the income utilization to other county uses, not causing a multiplier effect in the studied county. The fact of the not utilization of the properties on productive investments in order to supply the finite characteristic of oil and this source of royalties, contradicts one of the reasons of its establishment which is the payment for its productive exhaustion of a land resource

Avaliação do potencial tóxico de águas oriundas de irrigação agrícola no Baixo-Açu/RN: um problema socioambiental

For many decades the problematic raised about the indiscriminate use of pesticides in modern agriculture has incited the interest of many researchers to discover the effects caused by such products in the environment and consequently in the life of the ones which use that products (farmers) and those people who live in places next to the agricultural areas. Facing these facts, this research had the intention of comprehend the environmental perception of habitants of the Distrito Irrigado do Baixo-Açu (DIBA), located in the semiarid of Rio Grande do Norte, by using agro toxics and its possible environmental effects, as well as evaluate the levels of toxicity of waters from agricultural runoff in this region by using eco-toxicological exams with Ceriodaphnia silvestii. Were done 86 interviews with dwellers and farmers from DIBA. With the results reached in the evaluation of the interviews it was possible to identify that one of major problems is the inappropriate discard of empty packs of the pesticides used at that place. The samples collected for eco-toxicological evaluation showed a variation in its toxicity, once that the point of collect which receives waters from different cultures presented in four out of five samples toxicity for the tested species. Therefore, it concludes that the indiscriminate use of pesticides agricultural practice presented a potential to pollute to the irrigation waters, and the absence of elucidation by the farmers about the manipulation of these products contribute to the risk of environmental contamination and the possible decrease of the quality of life of the dwellers of the region