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Search Results: 1 - 10 of 19833 matches for " Marcos Vinicios;Viegas Neto "
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Decomposi??o e libera??o de nutrientes de resíduos culturais de crambe e nabo forrageiro
Heinz, Rafael;Garbiate, Marcos Vinicios;Viegas Neto, Antonio Luiz;Mota, Leandro Henrique de Sousa;Correia, Allan Michel Pereira;Vitorino, Antonio Carlos Tadeu;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011000900010
Abstract: this study aimed to evaluate the decomposition and nutrient release from crop residues of fodder radish and crambe in the implementation of no-tillage system. the experiment was conducted in a distroferric red latossol with 762g kg-1 of clay. the experimental design was randomized blocks with four replications. the treatments were applied in split plots, considering the species of cover crops (radish and crambe) as the main plots and harvest dates of decomposition bags (0, 15, 30, 45, 60, 75 days after management) as subplots. the cover crops were treated 60 days after management, in full bloom. radish presented a dry mass production of 5586kg ha-1 and crambe of 2688kg ha-1. the kinetics of residue decomposition had a behavior similar to the dynamics of nutrient release, with an initial rapid phase followed by a slower one. the k, p and mg are released more quickly for subsequent crops. the increased speed of nutrients release by crops occurred around 15 days after the biomass management.
Effect of temperature and pre-germination treatments on seed germination and seedling vigor of Jatropha curcas L
Leandro Henrique de Sousa Mota,Rafael Heinz,Marcos Vinicios Garbiate,Silvana de Paula Quint?o Scalon
Biotemas , 2012,
Abstract: To date, there are no official methods used to test the seed germination of physic nut (Jatropha curcas) and there have only been a few attempts to optimize the germination of this species. The objective of this study was to evaluate the effect of different temperatures and pre-germination treatments on the germination and seedling vigor of J. curcas. The treatments were arranged in a completely randomized factorial scheme with four temperatures (20, 25, 30 and 20-30°C) x two types of seeds (with and without the seed tegument) x six periods of water imbibition (0, 6, 12, 18, 24 and 30h). The seeds were sown using a roller system with four replications of 50 seeds for each treatment. The germination percentage was higher for seeds stored at 25°C, when the seed tegument was maintained. When the time of water imbibition was increased, the germination percentage decreased, as well as the index of germination velocity and the percentage of germination of the first count. Imbibition for up to 12h led to an increase in hypocotyl growth. For this species, the maximum germination potential and highest vigor were obtained at 25°C, for seeds with teguments that were maintained and were not submitted to water imbibition.
Modelo de simula??o de sistemas de pastejo rotativo e contínuo de azevém (Lolium multiflorum lam.) na bovinocultura
Silva Neto, Benedito;Schneider, Mariane;Viegas, Julio;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000400035
Abstract: the main objective of the paper is to propose a dynamic systems simulation model for the analysis of pasture management seeking to maximize animal intake. the forage used was annual ryegrass, grazed by bovine adults. the variables considered were: animal stocking density, forage growth rate, animal apprehension rate, first entrance of the animals in the pasture (beginning of grazing) and rotation cycle (period of grazing plus period of rest of the pasture). to simulate the pasture growth the verhulst equation was used. the computational model was programmed using software berkeley madonna. simulations with this software showed that when grazing started early (until the 73 days) the rotative system provided greater animal dry matter intake than the continuous grazing system. when the grazing started between 74 and 95 days the continuous system provided greater animal dry matter intake than the rotative system. the simulations also showed that when the rotative system started early (60 days), the cycle of 30 days (a day of grazing and 29 of rest) provided greater animal dry matter intake. when the rotative system started later (75 days), variations of the grazing cycle length had little influence on dry matter intake.
Modelo de simula o de sistemas de pastejo rotativo e contínuo de azevém (Lolium multiflorum lam.) na bovinocultura
Silva Neto Benedito,Schneider Mariane,Viegas Julio
Ciência Rural , 2006,
Abstract: O principal objetivo do trabalho é propor um modelo de simula o de sistemas dinamicos para a análise do manejo de pastagens visando a maximizar o consumo de forragem pelos animais. A forrageira utilizada foi o azevém anual, pastado por bovinos adultos. Foram consideradas diversas variáveis como: lota o animal, taxa de crescimento do pasto, taxa de apreens o da forragem pelos animais, primeira entrada dos animais na pastagem após a emergência (início do pastejo) e ciclo de rota o (soma dos dias de pastejo e de descanso do pasto). Para simular o crescimento do pasto, foi utilizada a equa o de Verhulst. Simula es efetuadas em um modelo computacional formulado no aplicativo Berkeley Madonna indicaram que, quando a entrada dos animais no pasto foi mais precoce (até os 73 dias), o sistema rotativo proporcionou um maior consumo de matéria seca pelos animais que o sistema de pastejo contínuo. Já quando a entrada dos animais no pasto foi entre os 74 e os 95 dias, o sistema contínuo proporcionou um maior consumo de matéria seca pelos animais que o sistema de pastejo rotativo. As simula es indicaram também que, quando o pastejo rotativo é iniciado precocemente (60 dias), o ciclo de 30 dias (um dia de pastejo e 29 de descanso) proporcionou maior consumo de matéria seca pelos animais. Já quando o pastejo rotativo é iniciado tardiamente (75 dias), varia es da extens o do ciclo de rota o tiveram pouca influência sobre o consumo de matéria seca pelos animais.
A educa o especial no ambito da política de fundos no financiamento da educa o / Education funding policy for special education
Luciane Torezan Viegas,Marcos Edgar Bassi
Reflex?o & A??o , 2009,
Abstract: O artigo examina a Educa o Especial entre 1998 e 2006, e procura demonstrar que o desempenho das suas matrículas, seja no setor público seja no setor privado, foi fortemente influenciado pelo financiamento da educa o. Durante este período esteve em vigor um fundo público constituído com recursos da vincula o constitucional de receitas para a educa o que priorizou o ensino fundamental. A primeira se o descreve, de modo sucinto, aspectos do direito à Educa o Especial inscrito na legisla o brasileira. A segunda se o examina o comportamento dasmatrículas da Educa o Especial no ambito de uma política de financiamento da educa o que priorizou o ensino fundamental em detrimento das outros níveis e modalidades de ensino. Concluique a Educa o Especial de ensino fundamental, mesmo sem contar com recursos financeiros suficientes para um atendimento adequado, refletiu o comportamento das matrículas do ensino regular, em que se observou a municipaliza o e a amplia o da cobertura. Destaca também que o setor privado, filantrópico e sem fins lucrativos continuou se expandindo, contando com um aporte maior de recursos públicos. Abstract The article examines special education between 1998 and 2006 and aims to demonstrate that enrollment performance, either in the public sector or in the private sector, was strongly influencedby education funding. During that period, a public fund created from resources of constitutional linked revenues for education that prioritized primary education was available. The first section briefly describes aspects of the right to special education enshrined in the Brazilian legislation. The second section examines enrollment performance of special education under a policy of education funding that prioritized primary education to the detriment of other education levels and modalities. It was concluded that elementary school special education, even without counting on sufficient financial resources for an adequate care, had an increase enrollment rate in regular school, where school municipalization and coverage expansion was observed. It was also highlighted that the philanthropic and nonprofit private sector continued to grow, with a greater intake of public resources.
Eficiência agron?mica de superfosfato triplo e fosfato natural de Arad em cultivos sucessivos de soja e milho
Ono, Fábio Benedito;Montagna, Juliano;Novelino, José Oscar;Serafim, Milson Evaldo;Dallasta, Daniel Comiran;Garbiate, Marcos Vinicios;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000300010
Abstract: the aim of this study was to evaluate the effects of phosphate fertilizer rates on soybean and corn crops, in crop rotation. the experiment was carried out in a greenhouse at the grande dourados university, in pots with samples of 5.5 dm3 clayey dystropherric red latosol, where the triple superphosphate (tsp) and the arad rock phosphate (arp) were used as p source. two kinds of arp were used. in one, the total p (arad t) was considered while in the other, only the p soluble fraction in citric acid at the concentration of 2% (arad sa) was considered, resulting in three factors of study, each with six levels of p (0, 56, 112, 224, 336, and 560 mg dm-3). the soybean was sowed in december 2006 and in the end of the cycle, the crop was harvested and evaluated for grain yield, p concentration in leaves and in the soil. after the soybean crop, it was turn for the corn sowing, which harvest occurred 76 days after sowing. the shoot dry matter and p concentrations in leaves were evaluated. the index of agronomic efficiency was calculated for both crops. we concluded that the tsp caused a better soybean grain yield, when compared to the arp. in the corn crop succeeding the soybean crop, the arp tended to be similar to the tsp values in the attributes evaluated.
Melhoramento do milho: III - Ensaios de híbridos
Viegas, G. P.;Krug, C. A.;Penteado, Marcos P.;
Bragantia , 1952, DOI: 10.1590/S0006-87051952000300003
Abstract: comparative trials with experimental corn hybrids are being conducted, in the state of s?o paulo, brazil, by the instituto agron?mico, at its experiment stations, at campinas, ribeir?o prêto and pindorama. during the years from 1938 to 1950 a total of 119 trials were planted, only twelve of them having been eliminated due to severe insect attacks. except 21 trials in randomized blocks and 2 in incomplete block designs, all the others were planted in simple lattice, with 4 replications. the individual plots, with few exceptions, had one or usually two 5 m rows each. among the yellow flint unes tested, l. 483 is, no doubt, the best. it has high combining ability and also excellent agronomic characters. the performance of some other lines, as l.278-1-1, l.606, l.334, l.445 and l. 422, is also briefly described. hybrid h.3531 [(483 x 581)x(278-1-1 x 429-2)] gave, on the average, an increase of 780 kg/ha over the "cateto" variety, having been tested in a total of 51 trials conducted at 3 different localities. some lines of yellow dent corn were also obtained from local and introduced varieties. among the lines received from different places of the united states, only hy and 38-11 furnished reasonably good results. however even these are too early for local conditions, the ears being poorly protected, exposing them to severe weevil damage. l.2051-1-2-3 derived from "amarel?o" and l.2761, from "tuxpan", are, so far, the best ones. at apresent, h.4624 [(2051-1-2-3 x 2761)x(278-1-1x483)j is being produced, as a good, medium dent double hybrid.
Sistema privado de seguro-saúde: li??es do caso americano
Andrade, M?nica Viegas;Lisboa, Marcos de Barros;
Revista Brasileira de Economia , 2000, DOI: 10.1590/S0034-71402000000100001
Abstract: the aim of this paper is to organize the main institutional characteristics of the american health system, emphasizing the reforms that occurred during the age of seventy and the difficulties to regulate the private sector of medical and hospital services. the most part of these problems are related to the contract regulation between the providers of medical and hospital service and the patients. the analysis of the american case is justified mainly because it is the most consolidated experience of private health insurance. the united states is the only developed economy with reduced participation of the public sector in financing and providing services to the labor population. in 1965 the american govern created two health programs to guarantee health care to the population of 65 and over, medicare, and to the family with low income, medicaid. the creation of these programs were an answer to the market imperfections that result in exclusion of some social groups from the market of health services. from 1960 to 1975 the health expenditure in united states rose from about 5% of the inner product to 8%. the tendency of continued rising motivated the health maintenance organization act of 1973, which main objective was to reduce the medical and hospital expense allowing a new way of managing health insurance. the new system of managing health services called managed care is organized with contracts established between three agents: managed care organizations that manage the utilization of health services and their financing, the integrated delivery systems that are the organizations of hospital and providers and the providers. the contracts established with the manage care try to solve the problem of moral hazard that exists in the supply of health services. the main conclusion of this paper is to show that contract flexibility has a meaningful effect in reducing the costs of health insurance resulting in more efficiency of health care offered. this flexibility didn't
Velhos dilemas no provimento de bens e servi os de saúde: uma compara o dos casos canadense, inglês e americano Old dilemmas in health care delivery: a comparison of the Canadian, English and American cases
M?nica Viegas Andrade,Marcos de Barros Lisboa
Nova Economia , 2000,
Abstract: This paper systematizes some aspects related to the consequences of the institutional health system in the financing and delivery of health care services. The analysis is based on empirical evidences from United States, Canada and United Kingdom. The focus of this work is on the analysis of the impacts of the incentives that result from the contracts established between health care market agents in the management efficiency of the health care services.
Popula??o negra e civiliza??o: uma análise a partir do estabelecimento da obrigatoriedade escolar em Minas Gerais (1830-1850)
Fonseca, Marcus Vinicios;
Educa??o em Revista , 2009, DOI: 10.1590/S0102-46982009000200003
Abstract: this article analyzes the process of the school obligation establishment as an element of mediation between the racial profile of the population and the idea of civilization that oriented the process of educational construction in minas gerais state. in the nineteenth century, it was an expressive predominance of the black population in minas gerais. this fact can be taken as a reference for the idea that school obligation had become a condition to guide the regulation and to control certain aspects of that part of the population. in order to carry this analysis through, we used as reference a census documentation that, in 1831, counted the population of all districts of minas gerais, reports of provincial presidents, narration of voyage and memories of the people that was in contact with the population of minas gerais in the nineteenth century.
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