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Search Results: 1 - 10 of 2721 matches for " Levy Paes; "
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Exporta??o de macronutrientes em cultivos comerciais de bambu no tabuleiro costeiro do estado da Paraíba
Lima Neto, Milton Costa;Bezerra Neto, Egídio;Barreto, Levy Paes;Silva, José Antonio Aleixo da;
Revista árvore , 2010, DOI: 10.1590/S0100-67622010000200007
Abstract: samples of soil and bamboo chips (bambusa vulgaris) 11 months in age (regrowth) were collected at commercial sites, located in the state of paraíba (brazil), aiming to evaluate the stem and branch biomass production, and the content and export of nutrients. the soil was analyzed for fertility and chips had analytical determinations made of mineral nutrients. the export quantity of each nutrient was calculated by multiplying the amount contained in the chip, by the chip productivity of each plot. the chip productivity, in tons per hectare was estimated by multiplying the measured yield of each plot, by the conversion factor derived from the relationship between the area of one hectare and the area of each plot. the soil of the mamoaba farm showed na, k, p, fe, zn and mn content higher than the soil from the garapu farm. the content of organic matter in the soil followed this order: garapu 2 > garapu 1 > mamoaba. the garapu farm had higher productivity than the mamoaba farm, probably due to the higher rainfall at garapu farm. the analyzed chips exported roughly twice as much k than n. p and s were the macronutrients less exported by bamboo. the macronutrient contents and exportations followed the same ratio for all sites studied: k>n>ca>mg>p>s. the fertilization programs for the studied species of bamboo have to prioritize the supply of nitrogen, potassium and calcium.
Automatic System for Failure Detection in Hydro-Power Generators  [PDF]
Luis Carlos Ribeiro, Levy Ely de Lacerda de Oliveira, Erik Leandro Bonaldi, Luiz Eduardo Borges da Silva, Camila Paes Salomon, Jonas G. Borges da Silva, Germano Lambert-Torres
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24006
Abstract: This paper presents an automatic system for failure detection in hydro-power generators. The main idea of this system is to detect failure using current and voltage signals acquired without any type of internal interference in the generator operation. The detected failures could be mechanical or electrical origins, such as: problems in bearings, unwanted vibrations, partial discharges, misalignment, unbalancing, among others. It is possible because the generator acts as a transducer for mechanical problems, and they appear in current and voltage signals. This automatic system based on electric signature analysis has been installed in Itapebi Power Plant generators since 2012. Some results are presented in this paper.
Almost Stochastic Dominance and Efficient Investment Sets  [PDF]
Moshe Levy
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.23038
Abstract: A major drawback of Mean-Variance and Stochastic Dominance investment criteria is that they may fail to determine dominance even in situations when all “reasonable” decision-makers would clearly prefer one alternative over another. Leshno and Levy [1] suggest Almost Stochastic Dominance (ASD) as a remedy. This paper develops algorithms for deriving the ASD efficient sets. Empirical application reveals that the improvement to the efficient sets implied by ASD is substantial (64% reduction for FSD). Direct expected utility maximization shows that investment portfolios excluded from the ASD efficient set would not have been chosen by any investors with reasonable preferences.
Peer-Pressure and Rational Underage Binge-Drinking  [PDF]
Amnon Levy
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.41018
Abstract:

This paper provides a utility-based definition of binge-drinking and examines the compatibility of this phenomenon with a rational decision making. Prohibition of young people’s consumption of alcohol is frequently violated by binge-drinking in groups. The analysis considers the roles of peer-pressure, full price of alcohol and crowding in underage group-drinking sessions and identifies the conditions for binge-drinking by expected utility maximizing members. Rational binge-drinking occurs when the impact of the peer-pressure on the individual member’s utility exceeds the loss of utility from the forgone spending on all other goods associated with the expected full marginal cost of consuming alcohol.

Can a Carbon Tax Be Effective without a Grand Coalition?  [PDF]
Amnon Levy
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.41003
Abstract:

This paper analyzes an interaction between a carbon-tax collecting and investing coalition of rich countries, abstaining rich countries and poor countries. The non-coalition countries may suffer from loss of reputation and guilt and may overstate the emission-moderating effect of the carbon tax. As long as these three types of countries react to their counterparts’ emissions, taxing carbon-dioxide emissions unilaterally does not necessarily reduce the global emissions. Nor does it necessarily moderate the emissions of the coalition.

Involvement of haptoglobin in prevention of oxidative stress cause by hemoglobin in preeclampsia  [PDF]
Hagit Goldenstein, Nina Levy, Andrew Levy
Advances in Bioscience and Biotechnology (ABB) , 2012, DOI: 10.4236/abb.2012.327126
Abstract: Haptoglobin (Hp) is a hemoglobin (Hb) binding protein which plays an important role in neutralizing oxidation reactions stimulated by heme-derived iron. Differences in Hp types due to the polymorphic nature of the gene have led to the discovery that individuals carrying the Hp 2-2 genotype are at increased risk of developing vascular complications in the setting of diabetes. Preeclampsia is a pregnancy related disease that is thought to be caused by increases in oxidative stress. The role of Hp polymorphism is determining preeclampsia has been addressed by several clinical studies but the results have been contradictory. Larger longitudinal studies are needed to answer this important question.
Solutos organicos em genótipos de sorgo forrageiro sob estresse salino
Oliveira, Lucimauro Antonio Alves;Barreto, Levy Paes;Bezerra Neto, Egídio;Santos, Mércia Virgínia Ferreira dos;Costa, Jordania de Cássia Araújo;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006000100005
Abstract: the objective of this work was to evaluate the organic compound content in forage sorghum under salt stress condition. the experiment was carried out in a greenhouse with a factorial scheme of 3x10, in a completely randomized design and four replicates. the evaluated treatments were three levels of soil salinity (2.4, 10 e 16 ds m-1) and ten genotypes of forage sorghum (ipa sf-25, ipa 02-03-01, ipa 42-70-02, csf-4, csf-5, csf-6, csf-7, csf-8, csf-9 e csf-10). there was an increase of 20.2 and 21.3% in soluble carbohydrates, respectively, for salt treatments of 10 and 16 ds m-1. the content of soluble proteins varied among sorghum cultivars, as a response to salt treatment. the highest values of total free amino acids occurred in plants grown under the salinity level of 16 ds m-1. saline treatments increased sorghum content of proline for the genotypes csf-5, csf-6 and csf-9 (at 10 ds m-1), and for csf-10 and csf-4 (at 16 ds m-1). the increase in soluble carbohydrates, soluble proteins, total free amino acids and free proline content is proportional to soil salinity and varies with the studied genotypes.
Avalia??o do uso da hidroxicloroquina no tratamento da osteoartrite sintomática de joelhos
Bonfante, Herval de Lacerda;Machado, Luana Gerheim;Capp, Ana Andrade;Paes, Maria Alice da Silva;Levy, Roger Abramino;Teixeira, Henrique Couto;
Revista Brasileira de Reumatologia , 2008, DOI: 10.1590/S0482-50042008000400003
Abstract: objective: to assess the effectiveness of hydroxychloroquine (hcq) on knee osteoarthritis (oa). methods: two groups of patients with oa diagnosis have been assessed in a controlled, randomic, double-blind study, the first group consisted of 16 patients who received the therapeutics with hcq, with the dosage of 400 milligrams per day during four months and the other one consisted of 13 patients who received the placebo during the same period of time. both groups were assessed using the western ontario and mcmaster universities osteoarthritis index (womac), lequèsne algofunctional index and the visual analogue scale (vas). results: there was not any difference between the groups on the womac subscales in relation to the pain (p=0,551), stiffness (p=0.512) and function (p=0.293). on the vas and lequèsne scale, there was not any difference statistically significant with p=0.461 and p=0.803 respectively. conclusion: although both groups have presented improvement, there was not superiority on the knees' oa treatment in the group which underwent hcq use in relation to the placebo group in this study.
Deposi??o e acúmulo de matéria seca e nutrientes em serapilheira em um bosque de sabiá (Mimosa caesalpiniifolia Benth.)
Ferreira, Rinaldo Luiz Caraciolo;Lira Junior, Mario de Andrade;Rocha, Mallon Sampaio da;Santos, Mércia Virginia Ferreira dos;Lira, Mário de Andrade;Barreto, Levy Paes;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000100002
Abstract: quantification of litter deposition and organic mantle accumulation are important steps on nutrient cycling studies. this study aimed to quantify litter deposition and organic mantle in a sabiá (mimosa caesalpiniifolia benth) woodlot in an experimental farm in the brazilian northeast region. twenty 0.50 x 0.50 x 0.15 m wood collectors, to quantify litter deposition, were systematically distributed over the area elevated 30 cm above the soil. deposited material was collected monthly from october 2000 to september 2001, and separated into leaves, twigs, flowers, pods and mixed portions. undecomposed organic mantle was randomly sampled nearby collector boxes, to a total of 20 monthly samples, from which a 0.30 x 0.30 m composed sample was collected. the collected material was also hand separated into leaves, twigs, flowers, pods and mixed portions. all collected material was dried at 60°c until constant weight was achieved. highest monthly litter deposition and leaf and pod fractions occurred in october, probably due to initiation of dry period. litter deposition and stock were estimated at 7830.44 kg.ha-1.year-1 and 8906.9 kg.ha-1, respectively, with the leaf fraction dominating. leaf fraction was the richest in nutrient content.
Underground water affects sexual behavior and gene expression of hormones related to reproduction in blue gourami males  [PDF]
Gad Degani, Gal Levy
Advances in Biological Chemistry (ABC) , 2013, DOI: 10.4236/abc.2013.31016
Abstract:

This study examined the effect of underground water on reproduction- and growth-related hormones in blue gourami males under non-reproductive and reproductive conditions. An increase in the percentage of males building nests under the highest percentage of underground water were compared to fish that maintained a lower percentage of underground water in the first two days. The % Gonado-somatic index (GSI) of males building nests was higher than non- reproductively active males in water containing the lowest concentration of underground water. In non- reproductively active males, brain gonadotropin releasing hormone 1 (GnRH1) and pituitary β subunit of gonadotropins (GtHs) and prolactin (PRL) mRNA levels were significantly higher in males maintained in underground water. In reproductively active males, mRNA levels of brain GnRH1, gonadotropin releasing hormone 3 (GnRH3) and pituitary PRL mRNA levels were significantly higher than males maintained in underground water. Thus, it is suggested that underground water with high salinity and conductivity levels affects the gene expression of repro- duction-related hormones; in reproductively active males, it shortened the duration of nest-building by blue gourami males.

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