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Search Results: 1 - 10 of 10512 matches for " Flávio;Arruda "
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Fator de resposta da produ??o do cafeeiro ao deficit hídrico em Campinas
Arruda, Flávio Bussmeyer;Grande, Marcos Alexandre;
Bragantia , 2003, DOI: 10.1590/S0006-87052003000100017
Abstract: coffee yield response to available water is a major factor on yield prediction and irrigation feasibility. in this way, results of irrigated (yi) and non irrigated (yni) yields of a 16-year field experiment with coffee plants carried out in campinas, state of s?o paulo, brazil, were analyzed as relative differences of (yi-yni)/yi and correlated to the relative difference of actual evapotranspiration, (etri-etrni)/etri. by suppressing each month of the year in that correlation, it was observed that water deficit occurred in april, may, june and july were important to yield analysis. it was possible to adjust the sensitivity coefficient (ky) or the yield response factor to water deficit, as recommended by fao. the annual yield response factor (ky) showed a linear relation to plant age indicating an increase of plant sensitivity to water stress along the years.
Fator de resposta da produ o do cafeeiro ao deficit hídrico em Campinas
Arruda Flávio Bussmeyer,Grande Marcos Alexandre
Bragantia , 2003,
Abstract: A quantifica o da resposta do cafeeiro à disponibilidade de água é um importante fator na estimativa da produ o e na análise da viabilidade da irriga o. Nesse sentido, as produ es de café irrigado (Yi) e n o irrigado (Yni) de um experimento conduzido por 16 anos em Campinas (SP), foram analisadas como diferen as relativas (Yi-Yni)/Yi e correlacionadas com o déficit hídrico, expresso pelos respectivos valores de evapotranspira o real, (ETRi-ETRni)/ETRi, com R2 = 0,6417. A supress o de cada mês do ano permitiu verificar sua importancia relativa na correla o. Abril, maio, junho e julho mostraram importancia na rela o com a produ o. Foi possível o ajuste do coeficiente de sensibilidade ou fator de resposta da produ o do cafeeiro ao déficit hídrico, Ky, conforme recomenda o da FAO. O fator de resposta de produ o (Ky) anual mostrou-se linearmente crescente com a idade da planta, indicando aumento quanto à sensibilidade ao déficit hídrico ao longo dos anos.
Electrocardiographic findings in acute cerebrovascular hemorrhage a prospective study of 70 patients
Arruda, Walter Oleschko;Lacerda Jr., Flávio Suplicy de;
Arquivos de Neuro-Psiquiatria , 1992, DOI: 10.1590/S0004-282X1992000300002
Abstract: seventy patients with hemorrhagic stroke were prospectively evaluated regarding the electrocardiographic abnormalities observed within the first 48 hours of the ictus. group i comprised 55 patients with spontaneous cerebral hemorrhage, and group ii 15 patients with subarachnoid hemorrhage. patients taking cardiac drugs (beta blockers, calcium-channel blockers, inotropic drugs) or with severe metabolic/electrolyte disturbances were excluded. the most common ecg abnormality was a prolonged q-tc interval: group i, 37 (67.2%); group ii, 8 (53.3%). only 4 (7.2% patients of group i and no patient of group ii had a normal ecg. no relation was found between the site of the intracerebral hematoma and the occurrence of any particular ecg change. a prolonged q-tc may be related to the development of severe cardiac arrhythmias observed in some patients with acute cerebral hemorrhage.
Estimativa do uso de água para fins de projetos de irriga??o, em fun??o da evapora??o de tanque,em Ribeir?o Preto
Arruda, Flávio Bussmeyer;Barroso, Luis Fernando Simardi;
Bragantia , 1984, DOI: 10.1590/S0006-87051984000200036
Abstract: fourteen years of ia-58 sunken pan evaporation data were analysed for predicting irrigation needs. the measurements were carried out in ribeir?o preto, state of s?o paulo. the data were grouped in 12 monthly series which followed the normal distribution with small skewness. all series had significant values for kurtosis, but april, may and june presented strong leptokurtic distributions, i.e., there was a piling up of scores in the center of the distribution. for each month the frequency distribution of mean daily evaporation as well as the comparison between the 75% level of probability of evaporation (recommended by fao) and the 50% level (commonly used), are presented. differences of up to 35%, during the rainy season, can occur between the two criteria and might result in improper design of irrigation system.
Efeito da irriga??o por gotejamento e ta?as e da cobertura morta na produtividade da ameixa 'Carmesim'
Arruda, Flávio Bussmeyer;Barreto, Geraldo Benedicto;Ojima, Mário;
Bragantia , 1984, DOI: 10.1590/S0006-87051984000200029
Abstract: a two year yield of plum, cv. carmesim, grown under subtropical conditions, was studied for continuous drip irrigation, drip plus mulch of grass and related to weekly basin irrigation. soil water distribution under drip treatment showed that for the heavy soil studied, its behaviour was more like light and median textured soils. horizontal water movement was only 40cm away from the application source, and by using two emitters per plant, only ten percent of the soil volume occupied by roots was irrigated, under drought situation. the amount of applied water was considered high, specially if associated to the normal elevated rainfall of that location. better results were obtained with treatment continuous drip irrigation, with relation to number of fruits and fruit weight. drip treatments slightly increased yield but caused significant earliness on harvesting.
Lamina adicional de irriga??o
Pires, Regina Célia de Matos;Arruda, Flávio Bussmeyer;
Bragantia , 1995, DOI: 10.1590/S0006-87051995000100023
Abstract: one criteria that may be applied in water management consists in irrigating whenever a pre-fixed water depth (h1) is completely depleted from the soil. therefore, the necessary irrigation depth (h1n) to replenish the soil profile to field capacity will be always larger or equal to hi. this paper investigates the relevance of this percentage of additional irrigation depth (%ha) by simulating the irrigation occurrence through water balance technique for several values of hi in ribeir?o preto, state of s?o paulo, brazil. the relative frequency of h1n was compared to hi and %ha calculated. the results showed that %ha was more important than something else when: 1) hi was small or 2) values of evapotranspiration were high; and 3) the probability level adopted in a project. figures are presented to help in the calculation of %ha.
Método para cálculo do intervalo de irriga??o suplementar
Pires, Regina Célia de Matos;Arruda, Flávio Bussmeyer;
Bragantia , 1995, DOI: 10.1590/S0006-87051995000100022
Abstract: this work develops a methodology for estimating supplementary irrigation requirement in tropical and subtropical regions. irrigations were simulated for february and july through simple water balance technique, based on 21 and 20 years, respectively, of meteorological data from ribeir?o preto, state of s?o paulo, brazil. in order to attend different situations of crops and soils, five levels of allowable soil water depletion (aswd) and two crop coefficients (kc) were chosen. for each month, irrigation intervals were annotated and its relative frequency calculated. the results allowed to design graphically the irrigation interval, for each month, as a function of: irrigation depth; crop coefficient; and probability level addopted in a project.
Um modelo híbrido (CLP-MILP) para scheduling de opera??es em polidutos
Magat?o, Leandro;Arruda, Lúcia Valéria Ramos de;Neves-Jr, Flávio;
Pesquisa Operacional , 2008, DOI: 10.1590/S0101-74382008000300007
Abstract: this work is motivated by the need of optimization in the pipeline-oil distribution scenario. the considered problem involves the short-term scheduling of activities in a specific pipeline. the pipeline is 93.5 km in length, and it connects refinery and harbor tankfarms, conveying different types of commodities (gasoline, diesel, kerosene, etc). an optimization model was developed to determine the pipeline scheduling with improved efficiency. such model combines constraint logic programming (clp) and mixed integer linear programming (milp) in an integrated clp-milp framework. the proposed model uses decomposition strategies, continuous time representation, and intervals that represent time constraints (time windows). real cases were solved in a reduced computational time (order of seconds). the computational results have demonstrated that the model is able to define new operational points to the pipeline, providing significant cost saving. indeed the clp-milp model is an efficient tool to aid the operational decision-making within this real-world pipeline scenario.
Redes dinamicas cognitivas aplicadas no controle supervisório de um fermentador
Mendon?a, Márcio;Arruda, L. V. R.;Neves-Jr, Flávio;
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2011, DOI: 10.1590/S0103-17592011000400003
Abstract: this paper uses dynamic cognitive networks (dcn) as an intelligent tool for supervisory control. the dcns are an evolution of fuzzy cognitive maps (fcm). intelligent systems and tools use expert knowledge to build models with inference and / or decision taking abilities. a supervisory control architecture for an alcoholic fermentation process is developed from the acquisition of empirical knowledge from an expert. the objective of the supervisor is to operate the process in normal and critical situations. for this, we propose the use of a dcn model with new types of concepts and relationships that not only represent cause-effect as in fcm models. simulation results are presented to validate the architecture developed.
The biology and functional morphology of Macoma biota (Bivalvia: Tellinidae: Macominae)
Piffer, Pedro Ribeiro;Arruda, Eliane Pintor de;Passos, Flávio Dias;
Zoologia (Curitiba) , 2011, DOI: 10.1590/S1984-46702011000300006
Abstract: macoma biota arruda & domaneschi, 2005, is a recently described species known only from the intertidal zone of praia da cidade, caraguatatuba bay, in the state of s?o paulo, southeastern brazil. the main purpose of the present paper is to describe the biology of m. biota, beginning with a detailed analysis of its anatomy and functional morphology and how these attributes are correlated with its habitat and life history. the morphology of the organs in the pallial cavity and their sorting devices indicate that this species has efficient mechanisms to process large amounts of particles that enter this cavity via the inhalant current. m. biota can rapidly select the material suitable for ingestion and direct the undesired excess to the rejection mantle tracts. these characteristics along with the siphon's behavior and the digestive tract configuration reveal that this species can be classified primarily as a deposit feeder, like other species of the genus; however, it can also behave as a suspension feeder, depending on the environmental conditions.
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