Produção, acúmulo e decomposição da serrapilhadeira e repartição da precipitação pluviométrica por espécies da caatinga

This study aimed to establish patterns of dynamics of litter and redistribution of rainfall of Caatinga vegetation. Sampling was done monthly for twenty three months in four areas: degraded, successional primary stage, secondary stage and late stage. We installed 72 collectors of 1.0 mx 1.0 m, with nylon fabric background in three areas. Litter deposited was fractionated into leaves, twigs, reproductive structures and miscellaneous, dried and weighed. To assess the stock of accumulated litter we used metal frame with dimensions of 0.5 mx 0.5 m, thrown randomly and collected monthly, taken to the laboratory for oven drying and weighed. To evaluate the decomposition, 40g of litter were placed in nylon bags (litterbags) mesh 1 mm ², dimensions 20.0 x 20.0 cm, being distributed on the soil surface and removed monthly, cleaned, dried and weighed. To evaluate the contribution of rainfall we used interceptometers installed 1.0 m above the ground surface, distributed under the canopy of six species of the caatinga, which evaluated the stemflow through collecting system installed around the stems of these species. The deposition of litter in the primary stage was 2.631,26 kg ha-1; 3.144,89 kg ha-1 in the secondary stage; 3.144,89 kg ha-1 in the late stage. The fraction of leaves was the largest contributor to the formation of litter in three stages. The degraded area showed greater accumulation of litter and decomposition has been sluggish during the dry period. We conclude that occurred greater litterfall in later stages. The late successional stage showed faster decomposition of litter, the evidence that is a better use of litter in nutrient cycling processes and incorporation of organic matter to the soil. The time required to decompose 50 % of the litter in the later stages of succession was lower indicating greater speed of release and reuse of nutrients by the vegetation. The specie jurema preta with less leaf area and consists of leaflets, showed greater internal precipitation in rain events of greater magnitude. The stemflow was not influenced by DAP and basal area. The water lost by trapping represented the largest proportion of total rainfall in all species studied

Acordos internacionais sobre a produção compartilhada de recursos naturais: a unitização interestatal na área do petróleo e gás sob o enfoque constitucional brasileiro

The apportionment of natural resources between sovereign States is a subject that relates many aspects of International law, as long as Constitutional Law, at the execution and application phases of international treaties that regulates the exploration of common goods. In this sense, because of their natural characteristics that creates an environment of constant migration and fixation in transboundary regions, terrestrial or maritime, the petroleum and the natural gas bound a complex juridical apparatus that can control the sovereign rights involved. This research is aim at accomplishing a study concerning the international agreements that enable the non-unilateral action, specifically the unitization treaties between sovereign States, as a manner to resolve situations related to the individualization of oil and/or gas reservoirs that go across their national borders. These agreements will be analyzed considering the international public law sources theory, bearing in mind yet the already existed experiences in this sense, not disregarding the way that this fact could affect Brazil. It will begin with an historical incursion over the unitization institute, covering its main characteristics and its formation and execution procedures, and finally it will address the Brazilian legal system and the comparative law threats the institute. The clauses of these relevant agreements will be analyzed in details, concerning its particularities and its contents. Because these agreements are international obligatory rules of law, it is indispensable that they are considered under the auspices of the international law system, focusing their nature and the subjects of international law and establishing them as sources of the international law, analyzing them, then, as international rules and the applicable law to these juridical relations, the conventional established, the consolidated international custom and the applicable International Law principles, appearing the State s responsibility as an important subject for the verification of the acts lawful practiced by States. The analysis of the apportionment of these natural resources ends with the individualization of possible exploitable marine oil fields located between the exclusive economic zone and the continental platform ends and the region administrated by the International Seabed Authority. At last, the Brazilian constitutional system appears as the mechanism of integration, application and execution of the international unitization agreements in Brazil, detaching the format and the proceedings that the international treaties take to acquire validity at the national legal system, passing through the treaties interpretation and the applicable constitutional principles, coming to its application in Brazil, considering the existing constitutional peculiarities and the role played by the National Agency of Petroleum, Natural Gas and bio-fuel ANP

Agir, aprender, formar, intervir, agir uma experiência dos consultores internos na gestão do conhecimento da Petrobrás UN-RNCE

This research aims at studying the formation of internal consultants in organizational setting in the joint resolution of problems, around the conversion of knowledge. The objective of research is to understand and explain the meanings attributed by Petrobras internal consultants to their practice and training for the conversion process of tacit knowledge into explicit, around the joint resolution of their problems with their collaborators. It has directed the next question: what the meanings assigned by the consultants of Unidade de Negócios Rio Grande do Norte e Ceara (UN-RNCE) in Knowledge Management (KM), for their interventionist and formative practices in problem solving, as well as conversion of tacit knowledge in explicit? This paper has assumed that there is a dual logic integrated into its daily practices: solving troubles and converting knowledge. The thesis has considered the daily practices of these consultants are characterized as epistemic spaces and permanent education through the conversion of knowledge. It has adopted the principles of multi-referential approach as foundations, regarding the translation of a variety of angles, perspectives and prospects which allow the interpretation and understanding of complex issues that are part of conversion of knowledge. The understanding and explanation of the senses are based on the methodology of the comprehensive interview; taking ownership is the sensitive listening for comprehensive interpretation of oral discourses of ten consultants, in addition to the autoscopy that putting into practice, thus, the stance of the researcher as an intellectual craftsman. Furthermore, it has assessed that the limits and possibilities for training and learning in the conversion of knowledge arise, on one hand from a predominantly driven training culture by the paradigm of technical rationality and one the other hand, from a set of relationship to knowledge and relation to know , revealed in the search for training in other dimensions. There are tensions between the local and global demands located in a situation marked by a systemic organization of knowledge. However, the context is perceived by researchers as impregnated by the discontinuity, unpredictability and uncertainty; mobilizing a number of elements necessary for the mediation in training practices of these consultants. Finally, it has set an instrumental and technological support, restricting the formation and undermining the position of the consultancy as nuclear function in Knowledge Management

Temperatura e tipo de preparo na conservação de produto minimamente processado de abacaxi-'Pérola'

O presente trabalho teve como objetivo avaliar o efeito do tipo de preparo (rodelas e metades) e da temperatura de armazenamento (3ºC, 6ºC e 9ºC) na conservação de produto minimamente processado de abacaxi-'Pérola'. Os frutos, depois de selecionados, lavados e desinfectados com cloro, foram armazenados por 12 horas a 10ºC, antes de serem processados sob condições higiênicas, embalados em contentores de polietileno tereftalatado (rodelas) ou bandeja de isopor recoberta com filme de cloreto de polivinila esticável (metades) e armazenados por até 12 dias. Os produtos foram avaliados quanto à evolução da atmosfera interna na embalagem, respiração, quantidade de suco drenado e evolução da massa fresca e da aparência. Foram testadas, durante o período de armazenamento, a aceitabilidade pelos consumidores, no início do experimento e enquanto a aparência e a análise microbiológica permitiram. A presença de bactérias mesofílicas e coliformes totais e fecais foi avaliada a cada três dias. Durante o armazenamento, a porcentagem de O2 nas embalagens apresentou decréscimo, enquanto a de CO2 aumentou até 20% para as metades e até 1,86% para as rodelas. A intensidade dos cortes no preparo teve influência direta na respiração, assim como nas perdas de suco e de massa fresca. A temperatura influenciou na respiração e foi fator limitante à vida de prateleira do produto, pois os produtos armazenados a 9ºC, conservaram-se por 6 dias, enquanto os mantidos a 3ºC e 6ºC, por até 9 dias.

Estabilidade do antígeno de célula total de Brucella abortus para uso no diagnóstico sorológico da brucelose bovina pela reação de fixação de complemento

A reação de fixação de complemento é um dos testes usados no diagnóstico confirmatório da brucelose bovina, e para sua realização emprega-se o mesmo antígeno usado na prova de soroaglutinação lenta, porém não foi possível encontrar na literatura estudos sobre a estabilidade desse antígeno para uso na prova de fixação de complemento, de modo a estabelecer um prazo de validade para o mesmo. Por isso, esta investigação teve por objetivo avaliar a estabilidade do antígeno de célula total de Brucella conservado sob refrigeração, para uso na reação de fixação de complemento. Analisaram-se 14 partidas de antígeno, preparado com Brucella abortus amostra 1119/3 e padronizado para uso na prova de soroaglutinação lenta, com tempo de fabricação variando de 9 meses a 23 anos e 11 meses. Testaram-se 167 soros bovinos com títulos variáveis de anticorpos contra Brucella, adotando-se a técnica com incubação a 37ºC nas duas fases da reação e 5 unidades hemolíticas 50% de complemento. Considerou-se como positivo o soro com pelo menos 25% de fixação de complemento na diluição 1:4. Compararam-se os resultados obtidos com as 13 partidas de antígeno com aqueles obtidos com a partida com 9 meses de fabricação, usando o teste de chi2 de McNemar e o coeficiente kappa. A grande maioria dos soros apresentou resultados muito próximos quando testados com as diversas partidas de antígeno, e não se observou relação entre tempo de fabricação do antígeno e diferenças nos resultados obtidos.

Impactos da legislação ambiental brasileira na exportação de camarão: um estudo com exportadores de camarão do Rio Grande do Norte

Brazilian exportations come growing in a constant form in the last years, stimulated for the globalization and public politics directed toward the increase of the internal surplus. In this context the objective of this work was to investigate the perception of the shrimp exporting entrepreneurs of Rio Grande do Norte, with relation to the impact of the Brazilian environmental legislation in the companies competitiveness at the external market. From data collected from the controllers of the companies, it was used a survey methodology, with exploratory and descriptive character. The results found in this study indicate that the companies, in general way, understand that the environmental legal requirements do not confuse nor help in the search and conquest of new international markets. A little more of the half of the researched companies, does not see the legislation rigid as important factor of competitiveness. However a sufficiently significant percentage, already has a more strategical vision on the subject, or at least already it heard to speak on such possibility

Efeito da introdução de resíduo de cinza de forno cerâmico em massa para cerâmica estrutural

The red ceramics and structural ceramics, as they are known, include ceramic materials made by blocks of seals and structures, bricks, tiles, smail flagstones manacles, rustic floors and ornamental materials. Their fabrication uses raw material such as clay and clay sites, with some content of impurity. It has good durability and mechanical strength to compression, low cost, making it one of the mainly used materials in civil engineering. The incorporation of many industrial activities residue to ceramic products is a technological alternative for reducing the environmental impact caused by its carefree disposal. This incorporation can promote chemical change and inertness of metals from residue, by fixation in the glassy phase of ceramic during the burning stage. The main aim of this project is to study the technical feasibility of the addition of ceramic oven ash into formulations of mass for structural ceramics. In this project two kinds of clay (plastic and non-plastic) were used, as well as the ash from firewood used in the process of burning of structural ceramics. A group of experiments was outlined, which permitted the evaluation of the influence of the burning cycle in different temperatures of the ash content in formulations for ceramic blocks through technological properties, mechanical behavior and microstructure. Five samples were processed of each one of the masses of plastic and non-plastic clay without addition of ash and with addition of ash on the percentages of 10 % and 20 %, for temperatures of 850 °C, 950 °C, 1050 °C and 1150 °C, obtained through sinterization process. Among the studied compositions, the one which presented best performance was the mass of clay with 10 % of ash, at temperature of 1150 °C, with the smallest absorption of water, the smallest apparent porosity, specific apparent mass a bit over the others and greatest mechanical resistance to flexion. The composition made confirmed the technical feasibility of the use of ash in the mass for structural ceramics with maintenance of its necessary characteristics for its purposes

Estudo térmico e de materiais na construção de casas populares com blocos confeccionados a partir de um composto a base de cimento, gesso, eps e raspa de pneu

We built an experimental house on an UFRN´s land using blocks made by a composite consisting of cement, plaster, EPS, crushed rubber and sand. Several blocks were made from various compositions and we made preliminary tests of mechanical and thermal resistance, choosing the most appropriate proportion. PET bottles were used inside the block to provide thermal resistance. In this work, a second function was given to the bottles: to serve as a docking between the blocks, because the ends of the cylinders came out of each block on top as well as at the bottom, with the bottom cut, allowing to fit of the extremities of the upper cylinder of a block in the lower holes of the other one, which were formed by the cutting already mentioned. Minimum compression tests were performed according to ABNT standards for walls closing blocks (fence). With that house built, we did studies of thermal performance in order to ascertain conditions of comfort, checking external and internal temperatures in the walls and in the ambient, among other variables, such as wind speed and relative humidity. The resulting blocks provided adequate thermal insulation to the environment, where the walls presented differences up to 11.7 ºC between the outer and inner faces, getting the maximum temperature inside the house around 31 °C, within the so-called thermal comfort zone for warm climates. At the end of the experiments it was evident the effectiveness of that construction in order to provide thermal comfort in the internal environment of the house, as well as we could confirm the viability of building houses from recyclable materials, reducing the constructive costs, becoming a suitable alternative for low- incoming families. Moreover, besides the low cost, the proposal represents an alternative use of various recyclable materials, therefore considered an ecological solution

Nitrogênio em cobertura e molibdênio foliar no feijoeiro de inverno

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Movimento estudantil e serviço social no capitalismo contemporâneo: tendências e particularidades

This dissertation aims to analyze the social direction in which the Student Movement in Social Work in Brazil (ENESSO) has gone through. This is done considering how the functioning of the National Executive, the Brazilian Social Work Student union has operated. The research analyzed their political position regarding the university as well as professional education in the period of 2003 to 2008. The study s theoretical and methodological object was obtained according to its structural, juncture, and time determinants. All of the mentioned elements considered the contemporary capital crisis and its implications towards the State and Society emphasizing specifically the changes that occurred in the University regarding professional education. For the purpose of data collection and production, a documental and field research was realized. Thus, interviews were done considering one manager of each management period of the ENESSO group in the time span of 2003 to 2008. Some subjects that represented the Brazilian Social Work Teaching and Research Association (ABEPSS) as well as were also interviewed. These subjects have had a relevant role in partnership with these entities and represented students in the contemporary scene. Results suggest that ENESSO has developed work that defends a project of a public, free and laic quality university. This entity also defends a project that considers the 1996 Curricular Guidelines. Currently, there is internal dispute in the social direction of the MESS, this is seen amongst political groups that diverge in opinions related to the analysis done by the Lula government regarding the political role that the National Student Union-UNE has taken in the counter-reform of higher education. This current juncture is seen as extremely individualist and it results as in unfavorable for the collective organization of the working class, especially regarding student movement. MESS has been going through a moment of profound instability and this dimension is being expressed by the absence of national coordinator for the 2008/2009 management period at ENESSO. Even though there are difficulties, it is possible to point out partnership of the entities that represent the national Social Work in Brazil. These partnerships are all related to a struggle and search for the development of a professional project that leads towards the sociability awareness that goes beyond capital.

Effect of Morus nigra aqueous extract treatment on the maternal-fetal outcome, oxidative stress status and lipid profile of streptozotocin-induced diabetic rats

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Effects of laser-weld joint opening size on fatigue strength of Ti-6Al-4V structures with several diameters

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Dilatonic current-carrying cosmic strings

We investigate the nature of ordinary cosmic vortices in some scalar-tensor extensions of gravity. We find solutions for which the dilaton field condenses inside the vortex core. These solutions can be interpreted as raising the degeneracy between the eigenvalues of the effective stress-energy tensor, namely, the energy per unit length U and the tension T, by picking a privileged spacelike or timelike coordinate direction; in the latter case, a phase frequency threshold occurs that is similar to what is found in ordinary neutral current-carrying cosmic strings. We find that the dilaton contribution for the equation of state, once averaged along the string worldsheet, vanishes, leading to an effective Nambu-Goto behavior of such a string network in cosmology, i.e. on very large scales. It is found also that on small scales, the energy per unit length and tension depend on the string internal coordinates in such a way as to permit the existence of centrifugally supported equilibrium configuration, also known as vortons, whose stability, depending on the very short distance (unknown) physics, can lead to catastrophic consequences on the evolution of the Universe.

Padronização interna em espectrometria de absorção atômica

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Os histricomorfos sul-americanos: uma análise comparativa do desenvolvimento embriológico

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)