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| Registros recuperados: 223 | |
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| Lopes,Sidinei José; Dourado Neto,Durval; Manfron,Paulo Augusto; Jasniewicz,Luís Renato. |
| The protected and hydroponics cultivation are increasing in Brazil, demanding a better knowledge of crop performance in this environment. Plant dry matter accumulation as a function of solar radiation, temperature, relative humidity and other weather parameters in greenhouse is different when compared with field cultivation. With the purpose of proposing models to characterize the temporal variation of leaf and total dry matter production of hydroponics-grown lettuce (Lactuca sativa L.) and to determine the flowering period and the maximum dry matter accumulation rate as a function of plant relative development (relative degree-days), solar radiation and effective thermal index, two experiments (Spring and Autumn) were carried out in the greenhouse, at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Dry matter; Plastic-greenhouse. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400007 |
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| Mirzabe, Amir Hossein; Taheri, Mojtaba; Pouyesh, Alireza; Bahrami Bavani, Neda. |
| The study was conducted to investigate some physical properties of celery seed at various moisture levels. The average length, width, thickness and 1000-seeds mass were 0.571, 0.429, 0.295 mm and 0.792 g, respectively, at moisture content of 5.24% (d.b). Length, width and thickness distributions of the seeds were modeled using Generalized Extreme Value, lognormal and Weibull distributions. Results showed that to model length of the seeds, lognormal distribution had the best performance while to model the width of the seeds Weibull distribution had the best performance. True density has increase from 892.02 to 931.42 kg/m3 when the moisture content increased from 5.24% to 20.25% (d.b). The angle of static friction increased from 28.45 to 39.66°, 25.15... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Image processing technique; Dimensional properties; Modeling; Gravimetrical properties; Medicinal plant. |
| Ano: 2016 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3559 |
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| Souza,Felipe Amorim Caetano de; Fernandes,Tales Jesus; Cunha,Fabiana Oliveira; Ribeiro,Rafaela Aparecida; Muniz,Fabiana Rezende; Meirelles,Sarah Laguna Conceição; Muniz,Joel Augusto; Moura,Raquel Silva. |
| Abstract: The objective of this work was to evaluate the development of the morphometric characteristics of Mangalarga Marchador horses through nonlinear models. The transversal method was used to collect data on height at the withers (HW), body length (BL), and thoracic (TP) and cannon (CP) perimeters from 200 horses (75 males and 125 non-pregnant females), aged between 6 and 153 months. The parameters of the Brody, Gompertz, logistic, and von Bertalanffy nonlinear models were estimated using the R software. Models were compared and selected using the coefficient of determination, the residual standard deviation, and the corrected Akaike information criterion. For adult females, HW, BL, TP, and CP ranged between 146.45-148.34, 148.59-151.64,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Equus caballus; Brody; Gompertz; Logistic; Modeling; Von Bertalanffy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000104308 |
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| Bocco,Mónica; Ovando,Gustavo; Sayago,Silvina; Willington,Enrique. |
| Land cover data represent environmental information for a variety of scientific and policy applications, so its classification from satellite images is important. Since neural networks (NN) do not require a hypothesis about data distribution, they are valuable tools to classify satellite images. The objectives of this work were to develop NN models to classify land cover data from information from satellite images and to evaluate them when different input variables are used. MODIS-MYD13Q1 satellite images and data of 85 plots in Córdoba, Argentina, were used. Five NN models of multi-layer feed-forward perceptron were designed. Four of these received NDVI (Normalized Difference Vegetation Index), EVI (Enhanced Vegetation Index), red (RED) and near infrared... |
| Tipo: Journal article |
Palavras-chave: Modeling; Back-propagation neural networks; Remote sensing; Crops-bare soil. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400009 |
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| Soares,Jefferson Bruno Carvalho; Santos Junior,Cezário Ferreira dos; Miranda,Leonardo de Sousa; Godoy,Mauricio Sekiguchi de; Souza-Filho,Miguel Francisco de; Lemos,Walkymário de Paulo; Silva,Anderson Gonçalves da. |
| Abstract The species Anastrepha zacharyi Norrbom has recently been recorded in the Amazon, however the species is subsampling in the biome. In this research, we report a new occurrence of A. zacharyi in the state of Pará and, through climate suitability modelling, present new possible distribution areas of the species in the Brazilian eastern Amazon. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Habitat; Insect pest; Modeling; Fruit fly. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262020000100210 |
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| Tartaglia,Francilene de L.; Righi,Evandro Z.; Rocha,Leidiana da; Loose,Luis H.; Maldaner,Ivan C.; Heldwein,Arno B.. |
| ABSTRACT The leaf is a very important structure of the plants, since it allows gas exchanges and the transformation of light energy into chemical energy. This study aimed to generate and test mathematical models for leaf area estimation in canola based on leaf dimensions. Two experiments were conducted with canola in 2014, in which leaves were collected in different phenological stages with different sizes and shapes. Subsequently, leaf length, width and area were measured (with automatic meter) in 606 leaves, which included 371 ovate and 235 lanceolate leaves. The models were generated using length, width and length versus width as independent variables and leaf area as dependent variable. The models were validated using a group of leaves different from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica napus; Ovate leaves; Lanceolate leaves; Modeling. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000600551 |
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| Marinho,Kedma Nayra da Silva; Freitas,Alfredo Ribeiro de; Falcão,Alencariano José da Silva; Dias,Francisca Elda Ferreira. |
| Growth curves of Nellore cows were estimated by comparing six nonlinear models: Brody, Logistic, two alternatives by Gompertz, Richards and Von Bertalanffy. The models were fitted to weight-age data, from birth to 750 days of age of 29,221 cows, born between 1976 and 2006 in the Brazilian states of Acre, Amapá, Amazonas, Pará, Rondônia, Roraima and Tocantins. The models were fitted by the Gauss-Newton method. The goodness of fit of the models was evaluated by using mean square error, adjusted coefficient of determination, prediction error and mean absolute error. Biological interpretation of parameters was accomplished by plotting estimated weights versus the observed weight means, instantaneous growth rate, absolute maturity rate, relative instantaneous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Maturity rate; Modeling. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000900006 |
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| Payo-payo, Marta; Silva Jacinto, Ricardo; Lastras, G.; Rabineau, Marina; Puig, P.; Martin, J.; Canals, M.; Sultan, Nabil. |
| Bottom trawling leads to recurrent sediment resuspension events over fishing grounds. Recent studies have shown how bottom trawling can drive seascape reshaping at large spatial scales and enhance sediment transport in submarine canyons, which subsequently impacts deep-sea ecosystems. Present knowledge on the transfer and accumulation of sediment flows triggered by bottom trawling is based on localized and infrequent measurements whilst a more complete picture of the process is needed. The present work focuses on the modeling of sediment transport and accumulation resulting from trawling activities in La Fonera submarine canyon, northwestern Mediterranean Sea, thus contributing to an improved assessment of trawling impacts. Based on mooring data within a... |
| Tipo: Text |
Palavras-chave: Bottom trawling; Inverse model; Modeling; Sediment transport; Submarine canyon; Turbidity currents. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00374/48549/48862.pdf |
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| Crane, Todd A.; Technology and Agrarian Development, Wageningen University; todd.crane@wur.nl. |
| Modeling has emerged as a key technology in analysis of social–ecological systems. However, the tendency for modeling to focus on the mechanistic materiality of biophysical systems obscures the diversity of performative social behaviors and normative cultural positions of actors within the modeled system. The fact that changes in the biophysical system can be culturally constructed in different ways means that the perception and pursuit of adaptive pathways can be highly variable. Furthermore, the adoption of biophysically resilient livelihoods can occur under conditions that are subjectively experienced as the radical transformation of cultural systems. The objectives of this work are to: (1) highlight the importance of understanding the place... |
| Tipo: Peer-Reviewed Insight |
Palavras-chave: Adaptation; Agropastoralism; Climate change; Mali; Modeling; Resilience. |
| Ano: 2010 |
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| Schweik, Charles; University of Massachusetts, Amherst; cschweik@pubpol.umass.edu; Evans, Tom; Indiana University; evans@indiana.edu; Grove, J. Morgan; U.S. Forest Service, Northeastern Research Station; mgrove@fs.fed.us. |
| This paper discusses opportunities for alternative collaborative approaches for social-ecological research in general and, in this context, for modeling land-use/land-cover change. In this field, the rate of progress in academic research is steady but perhaps not as rapid or efficient as might be possible with alternative organizational frameworks. The convergence of four phenomena provides new opportunities for cross-organizational collaboration: (1) collaborative principles related to "open source" (OS) software development, (2) the emerging area of "open content" (OC) licensing, (3) the World Wide Web as a platform for scientific communication, and (4) the traditional concept of peer review. Although private individuals, government organizations, and... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Land use; Land cover; Modeling; Open content; Free/libre software; Open source software. |
| Ano: 2005 |
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| Oliveira,José Evandro Gervásio de; Soares,João Batista; Barioni,Luis Gustavo; Leite,Gilberto Gonçalves; Braga,Auro César; Menezes,Marcelo Espellet. |
| The objective of this study was to develop an economically optimal plan for pasture production and supplementary feeding of horses. The plan was based on the optimization of a multiperiodic linear programming model with the objective of minimizing overall feeding costs, subject to the nutritional constraints of each horse category. The model encompasses a period of one year, from January to December, divided in bimonthly periods. Technical coefficients varied among periods based on local information regarding productivity of the forage crops, taking into account the local climatic conditions and seasonality of production. Literature data on feed nutritional value (crude protein and digestible energy), dry matter intake and nutritional requirements of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Linear programming; Modeling; Ration balancing. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400030 |
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| Botelho,Fernando M.; Corrêa,Paulo C.; Goneli,André. L. D.; Martins,Márcio A.; Magalhães,Felipe E. A.; Campos,Sílvia C.. |
| The aim of this work was to study the infrared drying process of carrot slices and to determine coefficients related to the heat and mass transfer of the process. Fresh carrots were used, dried until constant weight in a dryer with infrared heating source. Different models were utilized to fit the experimental data of constant and falling drying rate periods. It was verified that the coefficients of heat and mass transfer, during the constant drying rate, significantly increased with temperature on rise. The Diffusion Approximation, Two Terms, Midili and Verna models satisfactory represented the falling period of drying rate of carrot slices. The effective diffusion coefficient increased with temperature and this relationship can be represented by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Dehydration; Water diffusion. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662011000800012 |
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| Fossi, Maria Cristina; Romeo, Teresa; Panti, Matteo; Marsili, Letizia; Campani, Tommaso; Canese, Simonepietro; Galgani, Francois; Druon, Jean-noël; Airoldi, Sabina; Taddei, Stefano; Fattorini, Maria; Brandini, Carlo; Lapucci, Chiara. |
| The Mediterranean Sea is greatly affected by marine litter. In this area, research on the impact of plastic debris (including microplastics) on biota, particularly large filter-feeding species such as the fin whale (Balaenoptera physalus), is still in its infancy. We investigated the possible overlap between microplastic, mesoplastic and macrolitter accumulation areas and the fin whale feeding grounds in in a pelagic Specially Protected Area of Mediterranean Importance (SPAMI): the Pelagos Sanctuary. Models of ocean circulation and fin whale potential habitat were merged to compare marine litter accumulation with the presence of whales. Additionally, field data on microplastics, mesoplastics and macrolitter abundance and cetacean presence were... |
| Tipo: Text |
Palavras-chave: Floating plastic debris; Microplastics; Mediterranean Sea; Convergence areas; Modeling; Fin whales; Marine Protected Area. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00386/49763/50356.pdf |
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| Registros recuperados: 223 | |
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