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Search Results: 1 - 10 of 151050 matches for " H. Couto "
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Use of repellents for honeybees (Apis mellifera L.) in vitro in the yellow passion-fruit (Passiflora edulis Deg) crop and in confined beef cattle feeders
Nicodemo, D.;Nogueira Couto, R. H.;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2004, DOI: 10.1590/S1678-91992004000100006
Abstract: the presence of apis mellifera in places such as candy and soft drink factories, restaurants, and ice-cream shops has been a concern to many people. in the yellow passion-fruit crop, apis mellifera is able to collect all anther pollen but has no active role in pollination. honeybees also visit animal feeders with chopped sugar cane, preventing the cattle from eating. this work studied the effect of natural and synthetic substances as apis mellifera repellents in vitro in the yellow passion-fruit crop and in confined beef cattle feeders. there was a repellent effect in vitro with the following substances in decreasing order: tobacco, rue, garlic, parsley, and century plant extracts; average effect was twenty-five minutes. for the yellow passion-fruit, garlic extracts and 2-heptanone were equally efficient with a two and a half hour repellent action. garlic and citronella extracts were efficient in repelling apis mellifera from confined beef cattle feeder for six hours. garlic repellent action was higher than citronella.
Effect of Thermal Fluctuations in the Resonance Fluorescence of a Three-Level System
H. Couto,L. A. Amarante Ribeiro
Physics , 2001,
Abstract: The effect of thermal fluctuations in the resonance fluorescence of a three-level system is studied. The damped three-level system is driven by two strong incident classical fields near resonances frequencies. The simulation of a thermal bath is obtained with a large system of harmonic oscillators that represent the normal modes of the thermal radiation field. The time evolution of the fluorescent light intensities are obtained solving by a iterative method the Heisenberg equations of motion in the integral form. The results show that the time development of the intensity of the fluorescence light is strongly affected by the interaction of the system with the thermal bath.
Dark soliton in quasi-one-dimensional Bose-Einstein condensates with a Gaussian trap
H. L. C. Couto,W. B. Cardoso
Physics , 2013,
Abstract: In this paper we study dark solitons in quasi-one-dimensional Bose-Einstein condensates (BECs) in presence of an anharmonic external potential. The theoretical model is based on the Mu\~noz-Mateo and Delgado (MMD) equation that describes cigar-shaped BECs with repulsive interatomic interactions. Since MMD equation presents a nonpolynomial form, the soliton-sound recombination cannot display the same pattern presented in the cubic model. We perform numerical simulations to compare both cases.
Honey bee attractants and pollination in sweet orange, Citrus sinensis (L.) Osbeck, var. Pera-Rio
Malerbo-Souza, D. T.;Nogueira-Couto, R. H.;Couto, L. A.;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2004, DOI: 10.1590/S1678-91992004000200004
Abstract: this experiment studied the frequency and behavior of insects on sweet orange flowers, citrus sinensis (l.) osbeck, their effect on fruit production (quantity and quality), nectar and pollen collection, and the effectiveness of different attractants. over three consecutive years, the most frequent visitor to the flowers was apis mellifera (africanized). flowers visited less than ten times showed low fructification. fruit production was 35.30% greater in uncovered flowers. fruit mean weight was much greater in uncovered (180.2g) than in covered flowers (168.5g). fruits from the covered were more acid (1.411g of citric acid/100ml of juice) than the uncovered flowers (1.164g of citric acid/100ml of juice). the number of seeds per bud was higher in the uncovered (1 seed/bud) than in the covered treatment (0.8 seed/bud). bee-herer, eugenol, geraniol, citral, and lemon grass extract, mainly diluted in water, were effective in attracting honeybees to orchards. however, these compounds were less effective when diluted in sugar syrup. the same products had variable attractiveness to honeybees in different years.
Treatment of milk industry effluent by dissolved air flotation
Couto, H. J .B.;Melo, M. V.;Massarani, G.;
Brazilian Journal of Chemical Engineering , 2004, DOI: 10.1590/S0104-66322004000100009
Abstract: in this work, the application of the flotation technique by dissolved air (fad) to the treatment of milk industry effluent (milky effluent) is analyzed. initially, batch studies were carried out in a column built of acrylic with an external diameter of 2.5 cm and 50 cm in height. afterwards, the performance of a flotation tank with a 5.5 l capacity in the treatment of the milky effluent was addressed. in continuous mode of operation, separation efficiencies up to 90% were obtained for the experiments carried out at a saturation pressure of 4 atm and having a ratio of feed flow rate (qa) to saturated liquid flow rate equal to 1. the separation efficiency for flocculated milk was estimated from the overall mass balance for the flotation tank. separation efficiencies obtained agreed very well with the experimental results collected for qa/qls ratios lower than 1.
GOVERNMENTAL REPRESSION AND LIKELIHOOD OF CIVIL WAR ONSET: WORLD ANALYSIS, 1981-1997
Zimerman,Artur; Alves,Hélio Ricardo do Couto;
Revista de ciencia política (Santiago) , 2007, DOI: 10.4067/S0718-090X2007000300003
Abstract: the purpose of this paper is to investigate governmental repression combined with the type of regime that might determine a civil war. as a rule, scholars have not considered both variables in one quantitative model, in a systematic fashion. no empirical work employing political philosophy approaches can be found among the current quantitative literature on civil war. therefore, this paper fills the gap, by grounding our work on a more robust theory, complementing the originally data-driven pieces. three different hypotheses are tested and the findings indicate that poor countries with hybrid regimes and a high level of governmental repression are more likely to become involved in civil wars than countries with democratic or autocratic regimes. this paper can work as a contribution to the failed states discussion
GOVERNMENTAL REPRESSION AND LIKELIHOOD OF CIVIL WAR ONSET: WORLD ANALYSIS, 1981-1997 Represión gubernamental y probabilidad del comienzo de una guerra civil: análisis mundial, 1981-1997
Artur Zimerman,Hélio Ricardo do Couto Alves
Revista de Ciencia Política , 2007,
Abstract: The purpose of this paper is to investigate governmental repression combined with the type of regime that might determine a civil war. As a rule, scholars have not considered both variables in one quantitative model, in a systematic fashion. No empirical work employing political philosophy approaches can be found among the current quantitative literature on civil war. Therefore, this paper fills the gap, by grounding our work on a more robust theory, complementing the originally data-driven pieces. Three different hypotheses are tested and the findings indicate that poor countries with hybrid regimes and a high level of governmental repression are more likely to become involved in civil wars than countries with democratic or autocratic regimes. This paper can work as a contribution to the failed states discussion El propósito de este artículo es investigar la represión gubernamental combinada con el tipo de régimen como posible determinante del comienzo de una guerra civil. En general, los académicos no han considerado ambas variables en unúnico modelo, tal y como nosotros lo hacemos de manera cuantitativa y sistemática. En la literatura cuantitativa sobre las guerras civiles no existen trabajos empíricos que hayan empleado enfoques de filosofía política. En consecuencia, tratamos de llenar esta brecha basando nuestro trabajo en una teoría más robusta y complementando las bases de datos tradicionalmente utilizadas. Tres diferentes hipótesis han sido testeadas y los hallazgos indican que países pobres con regímenes híbridos y altos niveles de represión gubernamental son más propensos a verse envueltos en guerras civiles que países con regímenes democráticos y autocráticos. Este trabajo pretende ser una contribución a la discusión sobre los estados fallidos
Treatment of milk industry effluent by dissolved air flotation
Couto H. J .B.,Melo M. V.,Massarani G.
Brazilian Journal of Chemical Engineering , 2004,
Abstract: In this work, the application of the flotation technique by dissolved air (FAD) to the treatment of milk industry effluent (milky effluent) is analyzed. Initially, batch studies were carried out in a column built of acrylic with an external diameter of 2.5 cm and 50 cm in height. Afterwards, the performance of a flotation tank with a 5.5 L capacity in the treatment of the milky effluent was addressed. In continuous mode of operation, separation efficiencies up to 90% were obtained for the experiments carried out at a saturation pressure of 4 atm and having a ratio of feed flow rate (Qa) to saturated liquid flow rate equal to 1. The separation efficiency for flocculated milk was estimated from the overall mass balance for the flotation tank. Separation efficiencies obtained agreed very well with the experimental results collected for Qa/Q Ls ratios lower than 1.
Análise factorial aplicada a métricas da paisagem definidas em FRAGSTATS
Couto,Paula;
Investiga??o Operacional , 2004,
Abstract: a programme for spatial analysis based on a grid of pixels (fragstats 3.0) was used and the results of the analysis of 50 maps of land occupation using this programme were presented. 33 metrics of the landscape's structure were used and the properties of the metrics for various landscapes (maps of land occupation in continental portugal) were investigated. the metrics of the landscape's structure describe the size and form of the landscapes, the abundance of each type of spot and the spatial distribution of similar or different spots. to overcome the ambiguity of individual metrics and behavioural peculiarities, a varied factorial approach was adopted to describe and compare landscape structures. an analysis of main components for the 33 metrics and 50 landscapes was carried out. the first five factors explain 91.2% of the variation. these factors can be interpreted as an average of compaction of the spot, image texture (distribution of the pixels and proximity), landscape area, number of classes, area-perimeter relation (fractional measures).
Uso de softwares para o gerenciamento de bibliotecas: um estudo de caso da migra??o do sistema Aleph para o sistema Pergamum na Universidade de Santa Cruz do Sul
Couto, Fabiano;
Ciência da Informa??o , 2005, DOI: 10.1590/S0100-19652005000200011
Abstract: presents one of the first cases of conversion occurred between the main commercial software for library management available in the brazilian market nowadays. the stages of the conversion from the aleph system to pergamum system are described, as well as the main difficulties faced as well as the adopted solutions. this conversion process constitutes a case that could be possibly used as a basis for future conversions.
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