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Search Results: 1 - 10 of 50988 matches for " Eduardo Carvalho;Rodrigues "
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Interferência de cátions Ca2+ nas etapas de deslamagem e flota??o de minério de ferro
Carvalho, Mauro Rodrigues de;Peres, Ant?nio Eduardo Clark;
Rem: Revista Escola de Minas , 2004, DOI: 10.1590/S0370-44672004000200005
Abstract: aiming at the evaluation of the possibility to change the point of addition of hydrated lime, from the slurry stocking tanks of the pipeline to the feed of the concentrate thickeners, a sample of the feed material of samarco's concentrator was collected. laboratory experiments, involving grinding, dispersion, desliming and flotation, were carried out by varying the addition of hydrated lime as a function of the slurry's ph, to check out the interference generated by the ca2+ cations present in the recovered water over the desliming and flotation processes. the ph targeted level was chosen to better comply with the slurry rheology control during the pumping process (ph=11,4). the results appointed the change as possible, given the performance of the desliming process receives a continuous control. if the increase in the level of the hydrated lime added is enough to increase the pulp ph level to values above 10,5, the ca2+ cations start to act as coagulants, therefore promoting a negative effect over its own performance, affecting the flotation process and making it difficult to obtain the specified sio2 levels in the concentrate.
Análise de microincidentes na opera??o de usinas nucleares: estudo de caso sobre o uso de procedimentos em organiza??es que lidam com tecnologias perigosas
Carvalho, Paulo Victor Rodrigues de;Vidal, Mario Cesar Rodriguez;Carvalho, Eduardo Ferro de;
Gest?o & Produ??o , 2005, DOI: 10.1590/S0104-530X2005000200007
Abstract: organizations that work with hazardous materials, such as nuclear power plants, offshore installations, and chemical and petrochemical plants, have risk management systems involving accident control and mitigation to ensure the safety of their facilities. these systems are based on physical devices, such as protective barriers, equipment and systems aimed at preventing the occurrence and propagation of accidents, and on human aspects such as regulations and procedures. this paper analyzes the use of a variety of procedures by nuclear power plant control room operators. the methodology consisted of analyzing the work of control room operators during the normal operations, shutdown, and startup of a nuclear power plant, and in full scale simulator training. this survey revealed that routine noncompliance to procedures was considered normal according to the operating rationale, which is based on technical, organizational and cultural factors. these findings indicate that the competencies nuclear power plant operators must possess far exceed proper technical training and the ability to follow written instructions.
Nutri o mineral de mudas de pupunheira sob diferentes níveis de salinidade
Fernandes Antonio Rodrigues,Carvalho Janice Guedes de,Curi Nilton,Pinto José Eduardo Brasil Pereira
Pesquisa Agropecuária Brasileira , 2002,
Abstract: O potencial produtivo das plantas pode ser afetado por desordens nutricionais, induzidas pelo estresse salino. O objetivo deste trabalho foi estudar a influência de diferentes níveis de salinidade na nutri o mineral de mudas de pupunheira (Bactris gasipaes H.B.K.), mediante o uso de solu o nutritiva, em casa de vegeta o. O experimento foi instalado em blocos ao acaso, com sete tratamentos e quatro repeti es. Os tratamentos constaram das seguintes doses (mmol L-1): 0,0 de Na e 0,5 de Cl; 1,0 de Na e 0,5 de Cl (controle); e 5,0, 15,0, 30,0, 60,0 e 120,0 de NaCl. Os teores dos macronutrientes variaram em raz o da salinidade, e verificou-se que o P e K apresentaram seus teores reduzidos nas raízes, o K e o Ca, nas folhas e o S, nas diferentes partes, enquanto o Na e o Cl apresentaram teores incrementados nas diferentes partes da planta. As rela es Na/K, Na/Ca, Na/Mg, Cl/N, Cl/P e Cl/S aumentaram, causando um desbalan o nutricional na planta.
Determinants of Success in Private Equity-Venture Capital Investments
Eduardo Madureira Rodrigues Siqueira,Antonio Gledson de Carvalho,Humberto Gallucci Netto
Revista Brasileira de Finan?as , 2011,
Abstract: This paper investigates the determinants of performance of the investments of private equity and venture capital (PEVC) funds in Brazil. We use two unique databases: the First Brazilian Private Equity and Venture Capital Census and the Guia-GVcepe Endeavor, with information on this industry for the period 1999 to 2007. As measures of performance we use the percentage and number of exits through IPO, acquisition by a company or by another investor. Our results indicate that the factors influencing the performance of investments are: size of the fund, number of investments, the practice of co-investment, experience and foreign origin of the managing organization, focus on late stage, intensity of contact between managers and portfolio companies and the number of seats on the boards of the invested companies. The number of successes grows with the number of investments at a declining rate. This can indicate 1) a limit to the ability of managers or 2) that a large number of investments allows for greater diversification of risk, directing investments to companies of high risk but with a high upside.
Efeito do sistema de manejo sobre o comportamento em pastejo, desempenho ponderal e infesta??o parasitária em ovinos Suffolk
Cunha, Eduardo Antonio da;Santos, Luiz Eduardo dos;Roda, Domingos Sanchez;Pozzi, Cláudia Rodrigues;Otsuk, Ivani Pozar;Bueno, Mauro Sartori;Rodrigues, Carlos Frederico de Carvalho;
Pesquisa Veterinária Brasileira , 1997, DOI: 10.1590/S0100-736X1997000300003
Abstract: grazing behaviour, ponderal growth and level of parasitic infestation were studied in suffolk breed sheep, from 1994 to 1995, in nova odessa, s?o paulo. two management systems were compared: restricted grazing, where the animals were released to the pastures at 9:50 a.m. and confined at 5:30 p.m., and 24 hour grazing, where the animals were maintained all the time in the paddocks, but with access to shelters. thirty-four adult ewes were used in the summer period (17 under restricted grazing and 17 full-time grazing), and 42 ewes in the winter period (21 with restricted grazing and 21 full-time grazing). also, for both seasons, 12 tracer animals, six in each grazing system, were used to obtain worm counts from their digestive tracts. for three consecutive days, grazing behaviour, that is, whether grazing or not, was observed in january/february (summer) and july/august (winter) at 30 minute intervals from 7:00 a.m. to 5:30 p.m., also whether the animals stayed in the sun or shade, irrespective of whether they were grazing or not. the level of parasitic infestation was evaluated under each system by eggs per gram countings (epg) of the herd and the tracer animals, as well as by larvae count. it was concluded that restriction of grazing time by itself does not provide any effective control of parasitic infestation in sheep, however a better control was obtained in the summer period. restricted grazing time was compensated by the greater activity of the animals during the hotter hours of the day, however, this behaviour affected the animal performance, resulting in lower weight gains. greater forage availability in relation to estimated consumption may explain the similarity between the grazing times observed in both management systems, either in the summer or in the winter.
Correla??es genotípicas, fenotípicas e ambientais entre caracteres de mamoneira
Rodrigues, Helen Cristina de Arruda;Carvalho, Samuel Pereira de;Carvalho, Alexandre Alves de;Santos, Carlos Eduardo Magalh?es dos;Carvalho Filho, José Luiz Sandes de;
Ciência e Agrotecnologia , 2010, DOI: 10.1590/S1413-70542010000600005
Abstract: one of the great current challenges of agricultural research is the production of improved castor bean cultivars, with genetic stability, high quality and high yielding potential. the objective this work was to estimate genotypic, phenotypic and environmental correlations among traits of the castor bean plant to make the characterization of the accessions easy. they were evaluated in lavras, mg, brazil, in a randomized block design with three replicates, fifteen castor bean accessions. the traits evaluated were: plant height, stem height, number of nodes, stem diameter, final number of clusters, stand and 100-seed weight. it was observed that there was a positive phenotypic correlation of the node number and stem height, stem height and plant height, plant height and stem diameter and at last between stem diameter and 100-seed weight. there was also a positive environmental correlation among the correlations stem height and plant height, plant height and stem diameter, plant height and final stand and stem diameter and number of clusters, concluding that the estimated correlations make it possible to know the associations among the traits, giving important information to the establishment of a genetic improvement plan of castor bean from the accessions evaluated.
Metodologia inédita para medida da tor??o ocular reflexa
Barcellos, Ronaldo Boaventura;Alves, Carlos Alberto Rodrigues;Carvalho, Luiz Eduardo M. Rebou?as de;Andrade, Eric Pinheiro de;
Arquivos Brasileiros de Oftalmologia , 2001, DOI: 10.1590/S0004-27492001000400002
Abstract: purpose: to develop a methodology to evaluate ocular torsion reflex. methods: modifications of a helmholtz keratometer were made in order to perform keratometry in the primary position and during head tilt (30 degrees to the right, 30 degrees to the left). a total of 16 patients (32 eyes) were examined. there was a mean astigmatism of 0.50 to 3.50 (mean 1.18 ± 0.61). results: the mean recorded intortions (right eye 5.31 ± 4.23, left eye 5.22 ± 3.91) were slightly lower than the extortions (right eye 7.84 ± 4.79, left eye 7.78 ± 4.09) with no significant difference between both eyes. conclusions: the modified helmholtz keratometer allows new and simple method to quantify ocular counterrolling.
Avalia??o participativa do Programa Nacional de Suplementa??o de Vitamina A em um município da Regi?o Nordeste do Brasil
Almeida, Erika Rodrigues de;Carvalho, Alice Teles de;Nilson, Eduardo Augusto Fernando;Coutinho, Janine Giuberti;Ubarana, Juliana Amorim;
Cadernos de Saúde Pública , 2010, DOI: 10.1590/S0102-311X2010000500017
Abstract: this study aimed to evaluate the national program for vitamin a supplementation in a municipality (county) in northeast brazil, with participation by the parents or guardians of children under five years of age. this was a cross-sectional, population-based study using both qualitative and quantitative approaches. a total of 657 interviews were performed, and the vitamin a doses recorded on the children's immunization cards were analyzed. the population has access to high doses of vitamin a. however, knowledge of the vitamin a supplementation program was limited, especially among parents with less schooling. the program's coverage fell short of the ministry of health's target, especially after 18 months of age. it is thus necessary to intensify the program's educational activities in order to raise awareness among families of under-five children on the importance of vitamin a, its supplementation, and the importance of eating natural sources of this nutrient for the child's health.
O perfil dos gestores de informa??o para a indústria capixaba
Silva, Eduardo Valadares da;Silva, Antonio Jorge Rodrigues Pereira da;Rosemberg, Dulcinéa Sarmento;Carvalho, Isabel Cristina Louzada;
Ciência da Informa??o , 2008, DOI: 10.1590/S0100-19652008000100007
Abstract: the objective of this article is to map the academic profile of entrepreneurial professionals who work as information managers for industry in espírito santo state trying to contextualize the librarian's work. thus, an exploratory and descriptive research, based on a questionnaire with broad and narrow questions was done. the results suggest that most of the information workers do not know the procedural levels of information management. the results also suggest that there are a small number of librarians working at industries in the state, but that industry is open to workers aiming to be part of an innovative profile before the newest demanding of a dynamic market. librarians may become a very important agent for constructing this new scenario.
Intera??es silício-fósforo em solos cultivados com eucalipto em casa de vegeta??o
Carvalho, Rui;Furtini Neto, Antonio Eduardo;Santos, Custódio Donizete dos;Fernandes, Luiz Arnaldo;Curi, Nilton;Rodrigues, Daniel de Castro;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000300022
Abstract: this experiment had the objective of evaluating the p-si interactions in two soils by nutritional parameters of p in eucalyptus grandis cuttings under effect of si application. two experiments were conducted in greenhouse conditions utilizing the surface layers (0-20 cm in depth) of dark-red latosol cerrado phase and of cambisol campo cerrado phase of the physiographic zone campos das vertentes, mg, brazil. each soil was submitted to three sequential incubations: caco3 + mgco3 p.a. to keep ph around 6.0; basic fertilization, including p in a single dose calculated to maintain 0.2 mg l-1 of p in solution; and six doses of si (casio3) defined on the basis of the dose of p. the production of dry matter of the aerial part (dmap), contents of p and si in the dmap and phosphate fractions and acid phosphatase activity in plants were evaluated at 60, 90 and 120 days after the transplanting of cuttings to the pots. multiple regression equations of these variables were adjusted in terms of doses of si and of the evaluation times. cuttings cultivated in the cambisol presented gain of 15.25% in contents of p in the dmap. phosphorus fractions and acid phosphatase activity were not sensible to evaluate si-p interaction at soils studied.
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