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Search Results: 1 - 10 of 429592 matches for " Fávaro Sílvio "
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Identifica??o genética de modelos por pólos e zeros baseada no compromisso entre os erros de polariza??o e variancia
Arruda, L.V.R.;Fávaro, Sílvio;Neves-Jr., F.;
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2003, DOI: 10.1590/S0103-17592003000200001
Abstract: this work proposes a genetic algorithm (ga) to solve process estimation problems when the real process presents high orders polynomials (complexity model) or non-linearities, non-minimum phase behavior, etc. the algorithm finds the best linear model in the pole and zero form to represent the real plant using its input and output signals. a new chromosome representation was introduced and a new ''fitness'' function based on the tradeoff bias x variance was developed. to validate this genetic estimator, simulations studies were done and the ga performance was compared with one obtained by use of the traditional least square estimation method.
Identifica o genética de modelos por pólos e zeros baseada no compromisso entre os erros de polariza o e variancia
Arruda L.V.R.,Fávaro Sílvio,Neves-Jr. F.
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2003,
Abstract: Este trabalho prop em um algoritmo genético aplicado ao problema de identifica o de plantas n o-lineares, de fase n o-mínima ou plantas lineares de ordem superior. O algoritmo proposto tem como objetivo encontrar um modelo linear na forma de pólos e zeros e de ordem reduzida, que melhor represente a planta real, a partir dos sinais de entrada e saída. Uma proposta inovadora para a representa o dos indivíduos e fun o de ''fitness'' foi desenvolvida neste trabalho. Esta fun o de fitness representa o compromisso entre os erros de polariza o e variancia do modelo estimado. Já a representa o proposta divide o espa o de busca em dois subespa os: um destinado à busca de pólos e zeros de natureza real e outro com a finalidade de se encontrar os pólos e zeros complexos. Resultados de simula o s o utilizados para ilustrar o desempenho do estimador genético desenvolvido.
Reproduction of the flatfish Achirus lineatus (Pleuronectiformes: Achiridae) in Paranaguá Bay, state of Paraná, a subtropical region of Brazil
Oliveira, Elton C. de;Fávaro, Luís Fernando;
Zoologia (Curitiba) , 2010, DOI: 10.1590/S1984-46702010000400004
Abstract: the present study characterizes the oogenesis and the ovarian maturation scale, and determines the reproductive period, type of spawning, recruitment period, and population variations in the reproductive process of the flatfish achirus lineatus (linnaeus, 1758). specimens were sampled on a monthly basis in the shallow near shore area of the paranaguá bay, state of paraná, brazil, from march 2006 to february 2007. the specimens collected were measured for morphometric data (total length and total weight) and their gonads were exposed for macroscopic evaluation. the gonads were subsequently removed, weighed and processed for microscopic analyses. six phases of the ovarian follicle development were defined, as well as five ovarian development stages. growth patterns differed between the sexes: negative allometry for females and positive allometry for males. based on the seasonal assessments of the distribution of individual gsi values, the distribution of stages of gonadal development, individual body size, sex ratio, the ratio of juveniles to adults, and histological examination of the ovaries, reproduction was found to occur in the spring (spawning in batches), and recruitment in the autumn. these results show that a. lineatus is an estuarine-resident species that uses the study area for reproduction and recruitment, providing an argument in favor of the need to conserve the estuarine environment in order to preserve stocks.
Experiências de cavalos para citrus II
Brieger, F. G.;Moreira, Sílvio;
Bragantia , 1945, DOI: 10.1590/S0006-87051945001000001
Abstract: the english resumé is given in a different form from the portuguese "conclus?es". in the former we gave mainly the results which may be of general interest, explaining the tables (quadros) and the procedure of statistical analysis, while in the other the properties of the different rootstocks are discussed in detail since they are of immediate local interest. 1. in a previous publication, moreira (19) explained the layout and the first results of an experiment, under way since 1936 in the limeira exp. sta., on the influence of twelve different types of citrus rootstocks on three scion varieties : the oranges "baianinha" and "pera" and the grape-fruit "marsh seedless". we report here three main results obtained during the first six years of the experiment: a) all plants budded on sour and bitter-sweet oranges (c. aurantium), showed definite signs of the new disease "tristeza" ; b) other rootstocks such as citron (c. medica), ponderosa lemon (c. lemon) had such disadvantageous effect that they could be eliminated as suitable stocks ; c) the data of the first four crops permit to determine certain particularities of some rootstocks varieties used in the experiment. the present paper deals with the complete analysis of the data obtained during the years 1939-1942. this work offered various interesting problems from the point of view of statistical method. the results are of scientific interest, showing very strong interactions between rootstocks and scion in citrus, besides being of immediate practical importance. the widespread effect of the new disease "tristeza" caused on the citrus culture in the state of s?o' paulo where nearly all sweet oranges, both for local consumption and for export, were budded on sour orange rootstocks, requires immediate action and recommendations for the substitution by other suitable rootstocks. 2. the material used consisted of twelve rootstocks and three scion varieties in all their possible 36 combinations. scion varieties : "baianinha
Uniformidade da produ??o numa experiência de aduba??o da laranjeira baía
Brieger, F. G.;Moreira, Sílvio;
Bragantia , 1941, DOI: 10.1590/S0006-87051941000900001
Abstract: 1) - the present paper contains the results of the analysis of homogeneity in an experiment on the fertilization of the orange "baía" (washington navel), in progress since 1932 in the experiment station of the instituto agron?mico do estado de s?o paulo, at limeira, s?o paulo, brasil. such an experiment has to be divided into two phases': a preliminary period during which the trees remain without fertilizer in order to study their production and the homogeneity of the experimental plots, and the final period during which the different treatments are to be applied. the trees entered into production in 1938. it was decided to close up the first period after three harvestings, viz., in 1938, 1939 and 1940. the number of yields at our disposal remained thus very small. the trees, requiring urgent fertilization, began to be treated in 1941. 2) - special care was taken while selecting a suitable, homogenous, minimum area of 233.600 sq. m. where to plot the experiment. sour orange rootstocks from non selected seeds were subjected to a rigorous selection before budding. the buds were taken from two selected trees of heigh quality "baía" variety. 3) - every year the total number of fruits and their total weight in kg per tree were determined. these data were then subjected to a detailed statistical analysis, the results of which are presented in this paper. 4) - in spite of all precautions taken beforehand the plots proved to be highly heterogeneous. after some preliminary and afterwards discarded trials in grouping trees, the following sub-division of the whole experiment indicated in the graphs 2 and 3, was adopted : groups of 8 trees each, surrounded completely by a barrier of one row of other trees of "baía" were considered as unit plots. 6 unit plots (or "parcelas") form a sub-bloc and 4 sub-blocs form a bloc. we have thus a total of 7 blocs, numbered i, ii, etc.,all of equal size and form ; 7x4 = 28 sub-blocs ; 28x6 = 168 plots and finally 168 x 8 = 1344 trees. 5 of th
Water Quality and Ecotoxicity Assessment in Surface Waters from Cubat?o River and Surroundings, S?o Paulo, Brazil  [PDF]
Vanessa Silva Granadeiro Garcia, Eduardo Toshio Domingues Matsushita, Letícia Cristina Alves Mesquita, Deborah Inês Teixeira Fávaro, Sueli Ivone Borrely
Journal of Water Resource and Protection (JWARP) , 2017, DOI: 10.4236/jwarp.2017.912096
Abstract: The monitoring of water bodies means the attempt of protecting vulnerable groups of organisms inhabiting streams and rivers. Industrial and domestic discharges may worsen the water quality and affect biological balance, structure and the functioning of the ecosystem. Cubat?o City, is one of the largest industrial centers in Brazil and in Latin America, where the constant discharge of effluents into Cubat?o River and its tributaries caused a degradation scenario in the hydrographic basin of the region. The objective of this study was to evaluate the acute and chronic effects of surface water from Cubat?o River and two of its tributaries (Perequê and Pil?es) by ecotoxicological assays. In addition, physical chemical parameters were analyzed. Ceriodaphnia dubia and Vibrio fischeri were exposed-organisms during the studied period. The study was conducted between 2010 and 2011 in four campaigns and nine sites along the basin of Cubat?o River. The ecotoxicity was measured by Vibrio fischeri bioluminescence, EC50 values ranging from 31.25% to 71.61%. In contrast, based on a bioequivalence t-test statistical analysis, the results obtained with Ceriodaphnia dubia revealed no toxicity in the sampling sites. A critical analysis of raw data of luminescence was carried out showing higher values during the 2nd campaign. From the numbers obtained for physical-chemical parameters P5 was far the worst due to chlorides, hardness and conductivity. From the Pearson correlation analysis carried out with toxicity to V. fischeri and the physical chemical parameters, the dissolved oxygen in water resulted in a moderate positive correlation. Sediment contamination was also demonstrated in the region.
Estrutura da popula??o e aspectos reprodutivos do peixe-rei Atherinella brasiliensis (Quoy & Gaimard) (Atheriniformes, Atherinopsidae) em áreas rasas do complexo estuarino de Paranaguá, Paraná, Brasil
Fávaro, Luís F.;Oliveira, Elton C. de;Verani, Nelsy F.;
Revista Brasileira de Zoologia , 2007, DOI: 10.1590/S0101-81752007000400036
Abstract: the population structure and reproductive aspects of atherinella brasiliensis (quoy & gaimard, 1825) had been analyzed monthly from may 2000 to april 2001 in eight points of shallow areas of the estuarine complex paranaguá. the environment analyzes of the parameters ph, dissolved oxygen, transparency and salinity of the water suggest the existence of an increasing environment gradient in the direction north-south highway of the estuary. the temperature of the water evidenced the seasonal variation in the studied system, revealing related with the reproductive process. the peak of reproductive activity was determined for females and male, respectively, in the months of october and september, period where if it verified the ratio of two females for a male. the predominance of young individuals in the estuary occurred in the end of the spring and during the summer, after the reproductive period. the seasonal analyses of length and mass suggest the existence of a cyclical standard of growth to the long of the year, which reflects the reproductive period and the entrance of young individuals in the environment. thus, it is concluded that a. brasiliensis is a resident estuarine species, revealing widely distributed in the estuarine shallow areas, being able to be considered key in evaluations of environmental impact and/or action of handling plans and conservation in estuarine environments.
Stability of free and immobilized Lactobacillus acidophilus and Bifidobacterium lactis in acidified milk and of immobilized B. lactis in yoghurt
Grosso, Carlos Raimundo Ferreira;Fávaro-Trindade, Carmen Sílvia;
Brazilian Journal of Microbiology , 2004, DOI: 10.1590/S1517-83822004000100025
Abstract: this study evaluated the stability of bifidobacterium lactis (bb-12) and of lactobacillus acidophilus (la-05) both free and immobilized in calcium alginate, in milk and in acidified milk (ph 5.0, 4.4 and 3.8). the stability of immobilized b. lactis in yoghurt (fermented to ph 4.2), during 28 days of refrigerated storage was also evaluated. the efficiency of two culture media (modified mrs agar and reinforced clostridial agar plus prussian blue) for counting of b. lactis in yoghurt was determined. lee's agar was used to count streptococcus thermophilus and lactobacillus delbrueckii ssp. bulgaricus when b. lactis were counted in the mrs medium. b. lactis and l. acidophilus in both free and immobilized forms presented satisfactory rates of survival in milk and acidified milk because the average reduction of the population was only one log cycle after 21 days of storage. the number of viable cells of immobilized b. lactis in yoghurt presented a gradual decline throughout the storage period, passing from 108 cfu/ml to no count after 28 days of storage. when the cultures were not in equilibrium just the selective medium was efficient in counting b. lactis in yoghurt. the results showed that both microorganisms can be added to milk and acidified milk, because their population was only slightly affected during storage. the presence of traditional culture of yoghurt seems to be harmful for survival of immobilized b. lactis and the immobilization in calcium alginate failed as an effective barrier to protect the cells in all analysed treatments.
Water adsorption isotherms and isosteric sorption heat of spray-dried and freeze-dried dehydrated passion fruit pulp with additives and skimmed milk
Catelam, Kelly Tafari;Trindade, Carmen Sílvia Fávaro;Romero, Javier Telis;
Ciência e Agrotecnologia , 2011, DOI: 10.1590/S1413-70542011000600021
Abstract: moisture equilibrium data of passion fruit pulp powders with maltodextrin and gum arabic were obtained by two different drying methods (spray drying and freeze drying) and determined at 20, 30, 40 and 50o c. skimmed milk was used to substitute part of these additives in the samples. one formulation using passion fruit pulp/maltodextrin/skimmed milk (pms) was prepared, and another using passion fruit pulp/gum arabic/skimmed milk (pgs). the behavior of curves was type iii, according to brunauer's classification. gab models were fitted to experimental equilibrium data. the parameters obtained from gab models was affected by the presence of additives. the behavior of the sorption isotherms for different temperatures are similar, noting only a small effect of temperature. there were little differences between both drying methods and additives used in relation to equilibrium moisture content. the parameters obtained with the addition of the skimmed milk were considered satisfactory (xm values ranged from 0,04084 to 0,06488 in dry basis), demonstrating that it is an effective and cheap alternative for regular additives. a progressive increase in the heat of sorption in relation to decreasing moisture content was observed and the heat of sorption values of different samples are all similar, comparing the relative equilibrium moisture content.
Preparo e caracteriza??o de microcápsulas de oleoresina de páprica obtidas por atomiza??o
Santos, Andréa Barbosa dos;Fávaro-Trindade, Carmen Sílvia;Grosso, Carlos Raimundo Ferreira;
Ciência e Tecnologia de Alimentos , 2005, DOI: 10.1590/S0101-20612005000200024
Abstract: paprika (capsicum annuum l.) is a bright red coloring product of large use by the food industry. rich in carotenoids, paprika is susceptible to oxidative degradation. considering these aspects, this research is aimed to microencapsulate paprika oleoresin and to evaluate morphological characteristics, distribution and average particle size and the solubility of microencapsulated paprika oleoresin. the microencapsulation was carried out by spray drying, in porous agglomerates of rice starch/gelatin and arabic gum. scanning electron microscopy analysis showed, for arabic gum microcapsules, a cylindrical shape with a continuous wall with no apparent porosity or cracks and the core was distributed within the wall. the porous agglomerates of rice starch/gelatin microcapsules also presented a cylindrical shape; the walls were formed by the granules of rice starch, which was glued by gelatin; however the structure was shown to be porous. both materials presented unimodal distribution, with an average particle size of 16 and 20.3μm for arabic gum and starch/gelatin microcapsules, respectively. in spite of that it is possible to microencapsulate paprika oleoresin with both materials using the spray drying process, the morphologycal analysis revealed that arabic gum seems to be a more effective barrier to the core material. obtained results also show that the temperatures used in the microencapsulation were adequate, the size of the microcapsules were inside the range used by this kind of process and the solubility was excellent.
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