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Galeano-Vasco,Luis Fernando; Cerón-Muñoz,Mario Fernando; Narváez-Solarte,William. |
In this study, the Von Bertalanffy, Richards, Gompertz, Brody, and Logistics non-linear mixed regression models were compared for their ability to estimate the growth curve in commercial laying hens. Data were obtained from 100 Lohmann LSL layers. The animals were identified and then weighed weekly from day 20 after hatch until they were 553 days of age. All the nonlinear models used were transformed into mixed models by the inclusion of random parameters. Accuracy of the models was determined by the Akaike and Bayesian information criteria (AIC and BIC, respectively), and the correlation values. According to AIC, BIC, and correlation values, the best fit for modeling the growth curve of the birds was obtained with Gompertz, followed by Richards, and then... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chickens; Mathematical models; Poultry; Regression analysis; Weight gain. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014001100573 |
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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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LEMOS, N. L. S.; CAVALCANTE, A. C. R.; SILVA, T. G. F. da; PEZZOPANE, J. R. M.; SANTOS, P. M.; CÂNDIDO, M. J. D.. |
Abstracts: This study aimed to define areas suitable, and the irrigation water requirement for, cultivation of Tanzania guineagrass in the state of Ceará, Brazil. Tanzania guineagrass yield was estimated by a mathematical model, which considers the crop actual evapotranspiration, resulting from the crop climatological water balance. The water requirement throughout the year was estimated for soils with a water holding capacity of 20 (shallow soils), 40 (sandy soils), 60 (soils with medium texture) and 100 mm (clay soils). The relative frequency of occurrence of monthly productions greater than 2,750 kg DM ha-1 month-1 was obtained for different areas in Ceará, representative of most of the state's economic mesoregions. Tanzania guineagrass annual yields in... |
Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Capacidade de armazenamento de água; Taxa de acúmulo; Capim Tanzânia; Brasil; Ceará; Panicum maximum; Modelo matemático; Gramínea forrageira; Matéria seca; Mathematical models; Simulation models; Water requirements; Water storage; Pastures; Brazil. |
Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1070933 |
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RIZZARDI, M.A.; FLECK, N.G.; RIBOLDI, J.; AGOSTINETTO, D.. |
O objetivo deste trabalho foi ajustar e validar um modelo matemático baseado em densidades de picão-preto (Bidens spp.) e de guanxuma (Sida rhombifolia L.), integrando a época de semeadura da soja após a dessecação da cobertura vegetal, para quantificar perdas de rendimento de grãos. Foram conduzidos quatro experimentos, em Passo Fundo e Eldorado do Sul. Os tratamentos constaram de densidades de picão-preto ou de guanxuma e de épocas de semeadura da soja em relação à data de dessecação da cobertura vegetal. Nos experimentos com picão-preto, a semeadura da soja foi realizada 3, 7 e 11 dias após dessecação (DAD) da cobertura vegetal, nos dois locais. Com infestação de guanxuma, a semeadura da soja foi realizada 3, 7 e 11 DAD em Passo Fundo, e 20, 24 e 28 DAD... |
Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Picão-preto; Guaxuma; Densidade de plantas daninhas; Perda de rendimento; Modelo matemático; Dessecação de cobertura vegetal; Beggarticks; Arrowleaf sida; Weed density; Crop yield losses; Mathematical models; Plant cover desiccation. |
Ano: 2003 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/85693 |
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Le Berre, Jerome. |
Introduction: This document is the End of Second Year internship report for Rennes University 1's Senior Math and Computer Science Modelisation Professional diploma. This two month internship was completed at the Brest IFREMER center at the Coastal Ecology department. IFREMER participates, in the course of its institutional missions, in observation and coastal sea surveillance, in order to improve on the knowledge, protection methods and restoration of the marine environment. Marine phytoplankton proliferation is an important study subject because of its potential cause for nuisance, for men, consumers of sea products as well as for the ecosystem. During Spring and Summer, shellfish become invariably unsuitable for consumption due to toxins produced by... |
Tipo: Text |
Palavras-chave: Aquaculture; Growth; Phytoplanctonic algae; Mathematical models. |
Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/rapport-1770.pdf |
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Velázquez Castro, Gilberto David. |
Para complementar los servicios de información a empresas o personas físicas, en cuanto a comunicar, no sólo cambios en sus variables de interés, sino el impacto que éstos tienen sobre las actividades de la empresa, se propone un servicio que calcula tales impactos con el uso de modelos matemáticos. Se puede generar una alarma al cliente, cuando los cambios satisfagan criterios que éste define para tal efecto. De acuerdo a la urgencia indicada, se comunicará al cliente por correo electrónico, mensaje de texto o una llamada de un empleado del servicio, alguna situación que pudiera requerir una decisión oportuna.______A service to customers was conceived in order to offer information about the impact of changes in their data, rather than just report... |
Tipo: Tesis |
Palavras-chave: Comunicación oportuna; Interpretable; Modelos matemáticos; Alarmas; Datos del entorno empresarial; Maestría; Computo Aplicado; Timely communicaction; Interpretable; Mathematical models; Alarms; Business environment data. |
Ano: 2009 |
URL: http://hdl.handle.net/10521/1505 |
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Registros recuperados: 206 | |
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