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| Registros recuperados: 122 | |
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| Laxminarayan, Ramanan. |
| In the past, malaria control efforts in sub-Saharan Africa have relied on a combination of vector control and effective treatment using chloroquine. With increasing resistance to chloroquine, attention has now turned to alternative treatment strategies to replace this failing drug. Although there are strong theoretical arguments in favor of switching to more expensive artemisinin-based combination treatments (ACTs), the validity of these arguments in the face of financial constraints has not been previously analyzed. In this paper, we use a Bioeconomic model of malaria transmission and evolution of drug resistance to examine questions of optimal treatment strategy and coverage when drug resistance places an additional constraint on choices available to the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Malaria; Mathematical models; Drug resistance; Bioeconomics; Health Economics and Policy; I10; I19; C61. |
| Ano: 2003 |
URL: http://purl.umn.edu/10699 |
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| Persons, Jacqueline B.; Perloff, Jeffrey M.. |
| Two hypotheses implicit in the use of composite measures of attributions in tests of learned helplessness theory (but not implicit in the theory itself) were tested: the hypotheses that relationships between depression and the three types of attributions are equal in magnitude, and linear. To test these hypotheses, data from three published studies of the reformulated learned helplessness theory of depression (Abramson, Seligman, & Teasdale, 1978) were reanalyzed. The hypothesis that internal, stable, and global attributions are equally related to depression was tested and rejected. Increases in internal attributions were related to depression in one sample: increases in global attributions for negative events were related to depression in two samples:... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Mathematical models; Sociology; Research Methods/ Statistical Methods. |
| Ano: 1988 |
URL: http://purl.umn.edu/47042 |
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| Armindo,Robson André; van Lier,Quirijn de Jong; Turek,Maria Eliza; Reis,Aline Mari Huf dos; Melo,Marina Luciana Abreu de; Ramos,Maria Elisa Palma; Ono,Gabriela Massame. |
| ABSTRACT The soil water retention curve (SWRC) is essential for vadose zone hydrological modeling and related applications. In 2004, Groenevelt and Grant (GRT) presented a mathematical model for describing the SWRC and reported its mathematical versatility and good fit to soils from a Dutch database. In order to evaluate the application of GRT to SWRCs of Brazilian soils, we aimed to analyze the performance of GRT for 72 soils from Brazil. Besides that, the obtained results with GRT for these soils were compared to the fitting performance of the most frequently used models: Brooks and Corey (BC) and van Genuchten-Mualem (VGM). The three models were fitted to available soil water retention data by minimizing the sum of square errors. The Pearson correlation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tropical soils; Hydraulic properties; Mathematical models. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100407 |
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| Rosa,Jhonatas C.; Mendonça,Andreza P.; Oliveira,Angélica dos S.; Ribeiro,Sylviane B.; Batista,Andréia do R.; Araújo,Maria E. R.. |
| ABSTRACT ‘Babassu’ mesocarp flour has been used by the pharmaceutical, human food and animal feed industries. However, there is lack of standardization in the production, as well as absence of information on the management of the product’s quality. Thus, the objective of this study was to dry the ‘babassu’ mesocarp in forced-air oven and solar dryer, adjust different mathematical models to the experimental data, as well as to quantify the levels of proteins and crude fiber of the produced flour. The criteria for the adjustment were the coefficient of determination, magnitude of the mean relative error, standard deviation of estimate and the residual distribution trend. Drying in the shortest time occurred in oven at 60 °C (370 min), leading to water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Orbignya phalerata Mart.; Mathematical models; Protein. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001000709 |
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| Feitosa,Regilane M.; Figueirêdo,Rossana M. F. de; Queiroz,Alexandre J. de M.; Lima,Flávia C. dos S.; Oliveira,Emanuel N. A. de. |
| ABSTRACT The objective of this study was to develop formulations of myrtle pulp with emulsifier/stabilizer (Emustab® and Super Liga Neutra®) in different proportions; characterize the best foam, based on density and over-run; and determine drying kinetics at temperatures of 50, 60, 70, 80 and 90 oC and thicknesses of 0.5, 1.0 and 1.5 cm. Incorporation of 1.5% Emustab® and 0.5% Super Liga Neutra® to the myrtle pulp (F1) proved to be effective for foam-mat drying. The addition of additives influenced the physicochemical parameters of the whole myrtle pulp. The Midilli et al. model showed the best fit to the experimental data. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eugenia gracillima; Additives; Mathematical models; Foam mat. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001200858 |
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| Registros recuperados: 122 | |
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