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Search Results: 1 - 10 of 192347 matches for " Geraldo Cabral e Souza "
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Occurrence of insects and use of natural and synthetic insecticides in the storage of seeds of wild radish Ocorrência de insetos e uso de inseticidas naturais e sintéticos no armazenamento de sementes de nabo forrageiro
Geraldo Cabral e Souza,Juliana de Fátima Sales,Fabiano Guimar?es Silva,Márcio Fernandes Peixoto
Semina : Ciências Agrárias , 2012,
Abstract: Knowing the importance of preventive use of insecticides for seed treatment, this study aimed to identify potential insect pests of storage for seeds of radish by means of traps set on the field for six months and to evaluate the effect of natural and synthetic substances insecticides on the emergence of radish seedlings stored for 120 days. The bioassay, field-level, was conducted over a period of six months in the following environments: savannah, area of cultivation of crops, pasture and forest at the Federal Institute Goiano. For each of these environments were placed five traps made of PET bottles, containing respectively in maize, millet, soybean, crambe and wild radish. The traps were inspected every seven days to verify the the occurrence of insects plague. The substances were: 1) saffron, 2) limestone, 3) Gray, 4) neem, 5) diatomaceous earth, 6) chlorpyrifos, 7) deltamethrin and 8) control treatment. The experimental design was randomized blocks in factorial scheme 8 x 2 (8 substances and two storage periods, is not stored seeds and seeds stored for 120 days) with four replications. Were evaluated the percentage of emergence, hold rate of emergence, time to reach 50% emergence and the record of the dry mass of seedlings. The natural and synthetic substances do not interfere with seedling emergence in seeds of wild radish, even after storage for 120 days in a room. In the traps in the field, containing seeds of wild radish noted the presence of the insect Carpophilus sp. Sabendo da importancia do uso preventivo de inseticidas no tratamento de sementes, esta pesquisa teve por objetivos identificar possíveis insetos praga de armazenamento para sementes de nabo forrageiro por meio de armadilhas montadas em campo durante seis meses e avaliar o efeito de substancias inseticidas, naturais e sintéticas na emergência de plantulas em sementes de nabo forrageiro armazenadas por 120 dias. O bioensaio, em nível de campo, foi conduzido por um período de seis meses nos seguintes ambientes: cerrado, área de cultivo de grandes culturas, pastagem e mata do Instituto Federal Goiano. Para cada um desses ambientes foram colocadas cinco armadilhas confeccionadas em garrafas PET, contendo respectivamente sementes de milho, milheto, soja, crambe e nabo forrageiro. As armadilhas foram inspecionadas a cada sete dias para a verifica o da ocorrência de insetos praga. As substancias consistiram de: 1) a afr o, 2) calcário, 3) cinza, 4) nim, 5) terra de diatomáceas, 6) clorpirifós, 7) deltametrina e 8) tratamento controle. O delineamento experimental foi em blocos ao acaso
Significancia de efeitos técnicos na eficiência de produ??o da pesquisa agropecuária
Souza, Geraldo da Silva e;
Revista Brasileira de Economia , 2006, DOI: 10.1590/S0034-71402006000100005
Abstract: this article uses censored and truncated statistical models to assess technical effects potentially affecting the production frontier of embrapa's (empresa brasileira de pesquisa agropecuária) research centers. specifically the article assesses the significance of the factors level of research funds generated externally to the national treasury, actions of partnership, technical quality of research projects, client satisfaction, change in administration, type and size on the measurement of technical efficiency of the research centers. efficiency measures are computed both using data envelopment analysis (dea) and stochastic frontier methods. it is concluded that the dea efficiency measurements provide more information regarding the assessment of technical effects and that revenue generation, actions of partnership, technical quality of projects, and size are significant factors. the statistical analysis leading to these results fits a tobit model, defined by a distribution in the gamma family, to dea technical efficiency measurements. this analysis is consistent with the fit of a truncated normal distribution to residuals obtained from the fit of a dea production function.
Are Government Bonds Net Wealth? Some Empirical Evidence  [PDF]
Tito Belchior Silva Moreira, Geraldo da Silva e Souza, Fernando Ant?nio Ribeiro Soares
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.23045
Abstract: This paper aims to investigate the impact of government debt on economic growth for a balanced panel of G7 countries over the period 1990-2008. We found empirical evidence that Ricardian Equivalence does not holds in general. The analysis indicates that only Germany shows a negative association between public debt and economic growth. The US and France show Ricardian equivalence and UK, Japan, Italy and Canada show a positive association.
Parametros bioquímicos e microbiológicos e suas rela??es com a experiência de cárie em adolescentes sadios
Stamford, Thayza Christina Montenegro;Pereira, Daniela Marinho de Souza;Alcantara, Luciana Cabral de;Couto, Geraldo Bosco Lindoso;
Revista Brasileira de Saúde Materno Infantil , 2005, DOI: 10.1590/S1519-38292005000100009
Abstract: objectives: to establish a relationship between dental caries with the degree of streptococcus mutans present in the salivary flow and saliva buffer ability in 111 healthy adolescents seen at the pediatrics outpatient clinic of the hospital das clínicas de pernambuco. methods: intraoral examinations were performed and dental records filled to determine dmfs-s (decayed, missing teeth and filled permanent dental surfaces). following, saliva was collected to determined salivary flow and buffer ability. front teeth were scrapped to quantify streptococcus mutans present in the bacterial plaque. results: the population assessed had predominantly low caries activities with buffer ability of normal saliva and deficiency of salivary flow. the numbers of s mutans in the bacterial plaque exceeded 105 cfu/mg in the majority of individuals in the population studied. conclusions: caries activity was inversely proportional to the buffer capacity and directly proportional to the presence of streptococus mutans in the bacterial plaque. this low carie activity could be derived from the daily tooth-brushing with fluor dentifrices.
ALLOCATING FINANCIAL RESOURCES FOR COMPETITIVE PROJECTS USING A ZERO SUM GAINS DEA MODEL
Eliane Gon?alves Gomes,Geraldo da Silva e Souza
Engevista , 2010,
Abstract: In this paper we use a Zero Sum Gains Data Envelopment Analysis model (ZSG-DEA) to allocate financial resources for competitive projects managed by the Brazilian Agricultural Research Corporation (Embrapa) research centers. The initial output measurement in the production process modeled is the amount of financial resources available, uniformly distributed among research centers. The input variables are proxies for the intensity of projects externally funded, quality of project management, and level of participation in complex researches. The allocation proposed has maximum global efficiency.
INFRA-ESTRUTURA PORTUáRIA NACIONAL DE APOIO AO COMéRCIO EXTERIOR: HIERARQUIZA O DAS UNIDADES PORTUáRIAS
Wanda Fritsch da Silva e Souza,Geraldo da Silva e Souza
Engevista , 2007,
Abstract: We use Principal Components to derive linear indices with the objective toevaluate the importance of Brazilian ports in regard to the characteristics of Infra-Structure, Operational Results, Geo-economic Aspects, and Projected Demand for the year2011. Ranks, normalized by the maximum rank, of the port scores in each of thoseconstructs are used as inputs and outputs in Data Envelopment Analysis models ofmulticriteria evaluation to classify the Brazilian ports according their importance. Thisordination is original, has a non subjective basis and may be used to set priorities in thecontext of resource allocations in the context of the ports support to the Brazilian foreigntrade.
Influência de variáveis contextuais em medidas n?o-paramétricas de eficiência: uma aplica??o com métodos de reamostragem
Souza, Mirian Oliveira de;Souza, Geraldo da Silva e;Staub, Roberta Blass;
Pesquisa Operacional , 2009, DOI: 10.1590/S0101-74382009000200003
Abstract: we evaluate three bootstrap techniques for the statistical analysis of a non parametric production model for which a dea measure of efficiency is potentially affected by a set of exogenous factors. the application of interest relates to the assessment of the significance of the contextual variables income generation, processes improvement, intensity of partnerships, type and size on the technical efficiencies of embrapa's research centers. it is concluded that the bootstrap of the maximum likelihood estimator provides the best fit from the point of view of pearson correlation between observed and predicted values and is the most informative in regard to the significance of the variables considered. with the exception of size all contextual variables are statistically significant. income generation, processes improvement and intensity of partnerships are all positively associated with technical efficiency.
Previs?es para o mercado de carnes
Souza, Geraldo da Silva e;Souza, Mirian Oliveira de;Marques, Daniela Vieira;Gazzola, Rosaura;Marra, Renner;
Revista de Economia e Sociologia Rural , 2011, DOI: 10.1590/S0103-20032011000200009
Abstract: this work aimed to present brazilian forecasts of production, consumption, exports and export average price of meat (beef, pork and poultry). forecasts were generated using the markovian representation (state space) model and an autoregressive integrated moving average (arima). annual growth rates were also calculated. series observed involve the period from 1972 to 2009 and the analysis of the forecasts involves the period from 2010 to 2020. the forecasts of the products are well adjusted to the observations. according to the results, brazil showed a growth trend in all the analyzed variables. it is concluded that the brazilian meat market indicates good perspectives of strengthening in world terms, especially for poultry.
Rheological and Thermal Behavior of High-Density Polyethylene (HDPE) at Different Temperatures  [PDF]
Cynthia D’Avila Carvalho Erbetta, Getúlio F. Manoel, Ana Paula Lelis Rodrigues Oliveira, Maria Elisa Scarpelli Ribeiro e Silva, Roberto Fernando Souza Freitas, Ricardo Geraldo Sousa
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.513094
Abstract: In the present work, rheological properties of HDPE samples were measured at temperatures of 150°C, 190°C and 230°C. It was shown, by oscillatory tests, at low frequencies, that, for temperatures of 150°C and 190°C, there was a predominance of the viscous behavior over the elastic one. At 230°C, there was a predominance of the elastic contribution, and there was an increase of the molar mass compared with the ones obtained from the tests at 150°C and 190°C. The results obtained from the temperature ramp oscillatory test showed that, up to around 248°C, the viscous behavior prevailed, the opposite being observed at higher temperatures. At 230°C the sample showed significantly lower values of strain when compared with the ones observed at 150°C and 190°C. Oxidative induction time (OIT), melting point and degree of crystallinity were determined by differential scanning calorimetry (DSC). The DSC results and the rheological measurements showed a completely different behavior for the HDPE samples at 230°C compared with the 150°C and the 190°C ones, suggesting that HDPE, at the temperature of 230°C, underwent thermo-oxidative degradation with the initial predominance of crosslinking.
Synthesis, Characterization, and Study of PLGA Copolymer in Vitro Degradation  [PDF]
Anamaria Teodora Coêlho Rios Silva, Barbara Camilla Oliveira Cardoso, Maria Elisa Scarpelli Ribeiro e Silva, Roberto Fernando Souza Freitas, Ricardo Geraldo Sousa
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2015, DOI: 10.4236/jbnb.2015.61002
Abstract: The poly(lactic-co-glycolic acid), known as PLGA, is one of the main bioreabsorbable polymers used in the field of medicine today. This copolymer is widely applied in sutures, devices geared toward the controlled release of medication, and the guided regeneration of bone tissue as it presents a short degradation time. This work aimed to synthesize the 82/18 PLGA (expressed by the mass ratio of D,L-lactide and glycolide, respectively), to characterize and study the in Vitro degradation in the form of rods in phosphate buffer solution (PBS). The copolymer was synthesized by opening the cyclic dimer rings of the monomers D,L-lactide and glycolide, in the presence of the tin octanoate initiator and of the lauryl alcohol co-initiator. The characterization of the copolymer and the follow-up of its in vitro degradation were studied using: Differential Scanning Calorimetry (DSC), Thermogravimetry (TG), Infrared Molecular Absorption Spectroscopy with Fourier Transform (FTIR), Rheometry, and Scanning Electron Microscopy (SEM). Through these characterization techniques, it was possible to obtain the glass transition temperature, thermal stability, chemical composition, morphology, and molar mass of both the synthesized and the degraded copolymer. The molar mass of the synthesized copolymer was, approximately, 106 g·mol-1. The degradation rate of PLGA significantly increased from the 19th to the 28th day in PBS. After 28 days in PBS, the glass transition temperature and the molar mass reduced from 45°C to 17°C and from 1.5 × 106 g·mol-1 to 7.5 × 10g·mol
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