Regression Mathematical Models
Mostrando 37-45 de 45 artigos, teses e dissertações.
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37. Determinação simultanea, em linha, da concentração de soda caustica e de alumina em solução de aluminato de sodio do processo bayer de produção de oxido de aluminio
The objective of this project is the development of an automatic in line system to measure the alumina and caustic content in the sodium aluminate solution of the Bayer Process by using sensors and chemometrics calculations. The aluminum process production begins with the Bayer Process to extract the aluminum oxide from the bauxite, the aluminum ore. Then, t
Publicado em: 2004
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38. Determinação e quantificação de fatores de influência sobre a produtividade de "Harvesters" na colheita de madeira. / Quantification and determination of influency factors over harvesters productivity on logging.
The Brazilian cellulose and paper industry has been total sales of US$ 7.5 billions on 2000, with consume of 14 millions of m3 of eucalypt wood. Logging and wood transportation are responsible for 50% of final cost of wood. On cut-to-length system, the harvester is the main machine used on felling and processing of wood. This is an equipment with high cost a
Publicado em: 2002
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39. Use of a rotational bench viscometer to study the influence of temperature and agitation speed on vinasse viscosity
Brookfield R.V.T. apparent viscosity measurements of 31.1 to 73º Brix vinasses, with and without nondissolved solids (N.D.S.), were carried out at varying rotation speeds (N) and temperatures (T). A regression analysis of this data was carried out to select the corresponding mathematical models. It was concluded that apparent Brookfield viscosity for low co
Brazilian Journal of Chemical Engineering. Publicado em: 2000-06
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40. Linear programming models for cost reimbursement.
Tamura, Lauer, and Sanborn (1985) reported a multiple regression approach to the problem of determining a cost reimbursement (rate-setting) formula for facilities providing long-term care (nursing homes). In this article we propose an alternative approach to this problem, using an absolute-error criterion instead of the least-squares criterion used in regres
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41. Mathematical models for growth in alligator (Alligator mississippiensis) embryos developing at different incubation temperatures.
A variety of model-based (growth models) and model-free (cubic splines, exponentials) equations were fitted using weighted-nonlinear least squares regression to embryonic growth data from Alligator mississippiensis eggs incubated at 30 and 33 degrees C. Goodness of fit was estimated using a chi 2 on the sum of squared, weighted residuals, and run and sign te
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42. Modeling Yeast Spoilage in Cold-Filled Ready-To-Drink Beverages with Saccharomyces cerevisiae, Zygosaccharomyces bailii, and Candida lipolytica
Mathematical models were developed to predict the probability of yeast spoilage of cold-filled ready-to-drink beverages as a function of beverage formulation. A Box-Behnken experimental design included five variables, each at three levels: pH (2.8, 3.3, and 3.8), titratable acidity (0.20, 0.40, and 0.60%), sugar content (8.0, 12.0, and 16.0 °Brix), sodium b
American Society for Microbiology.
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43. Viability and Estimation of Shelf-Life of Bacterial Populations1
Mathematical concepts associated with the exponential and probit models are developed, and the similarity of the two methods is discussed. Because of its greater flexibility in design, the probit method was used to estimate the shelf-life for four bacterial populations, wet and dry spores of Bacillus anthracis and wet and dry cells of Pasteurella tularensis.
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44. Formulation and optimization of controlled release mucoadhesive tablets of atenolol using response surface methodology
The aim of the current study was to design oral controlled release mucoadhesive compressed hydrophilic matrices of atenolol and to optimize the drug release profile and bioadhesion using response surface methodology. Tablets were prepared by direct compression and evaluated for bioadhesive strength and in vitro dissolution parameters. A central composite des
Springer-Verlag.
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45. A case-control study to investigate the risk of leukaemia associated with exposure to benzene in petroleum marketing and distribution workers in the United Kingdom.
OBJECTIVES: To investigate the risk of leukaemia in workers in the petroleum distribution industry who were exposed to low levels of benzene. METHODS: From the cohort of distribution workers, 91 cases were identified as having leukaemia on either a death certificate or on cancer registration. These cases were compared with controls (four per case) randomly s