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Registros recuperados: 7
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A toolbox to evaluate data reliability for whole-ecosystem models: Application on the Bay of Biscay continental shelf food-web model ArchiMer
Lassalle, Geraldine; Bourdaud, Pierre; Saint-beat, Blanche; Rochette, Sebastien; Niquil, Nathalie.
Ecosystem models are always simplifications of reality and as such their application for ecosystem-based management requires standard validation. Here, the “DataReli” toolbox is proposed to evaluate the quality of the data used during the construction of ecosystem models, their coherence across trophic levels, and whether data limitations prevent the model long-term applications. This toolbox is the combination of three operational and complementary analyses: (i) the pedigree index to determine to what extent a model was calibrated on data of local origin; (ii) the graphical analysis known as PREBAL to assess whether a model respects some basic ecological and fisheries principles; and (iii) a sensitivity analysis to evaluate the robustness of model...
Tipo: Text Palavras-chave: Food-web model; Ecopath; Model evaluation; Parameter uncertainty; Ecosystem-based management; Bay of Biscay.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00188/29969/28484.pdf
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An evaluation of methods for modelling distribution of Patagonian insects RChHN
TOGNELLI,MARCELO F; ROIG-JUÑENT,SERGIO A; MARVALDI,ADRIANA E; FLORES,GUSTAVO E; LOBO,JORGE M.
Various studies have shown that model performance may vary depending on the species being modelled, the study área, or the number of sampled localities, and suggest that it is necessary to assess which model is better for a particular situation. Thus, in this study we evalúate the performance of different techniques for modelling the distribution of Patagonian insects. We applied eight of the most widely used modelling methods (artificial neural networks, BIOCLIM, classification and regression trees, DOMAIN, generalized additive models, GARP, generalized linear models, and Maxent) to the distribution of ten Patagonian insect species. We compared model performance with five accuracy measures. To overeóme the problem of not having reliable absence data with...
Tipo: Journal article Palavras-chave: Expert opinión; Model evaluation; Patagonia; Pseudo-absence data; Species distribution modelling.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300003
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Evaluierung der Erfolgsfaktoren des EFQM-Modells in der österreichischen Ernährungswirtschaft anhand des Analytischen Hierarchieprozesses AgEcon
Meixner, Oliver; Pochtrager, Siegfried; Haas, Rainer.
Numerous companies in the Austrian food industry have already been certified in accordance with the ISO 9000 standards. However, the introduction of a quality management system in a company alone does not guarantee continuous improvement as required by the standard ÖNORM ISO 9001:2000. In order to be successful when introducing and maintaining a quality management system in a company, a number of important factors must be considered. These success factors are derived from the „European Foundation for Quality Management (EFQM) Model for Business Excellence“. The purpose of the EFQM Model is to support the internal assessment of the quality management within a company, and it can be regarded as a motor for internal improvement. In particular, for companies...
Tipo: Journal Article Palavras-chave: Quality management; Success factors; Analytic Hierarchy Process; Model evaluation; Food industry; Agribusiness.
Ano: 2004 URL: http://purl.umn.edu/97434
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How accurate are pedotransfer functions for bulk density for Brazilian soils? Repositório Alice
BOSCHI, R. S.; BOCCA, F. P.; LOPES-ASSAD, M. L. R. C.; ASSAD, E. D..
The aim of this study was to evaluate the predictive capability of PTFs available in the literature to estimate soil pb in different regions of Brazil, using different metrics (mean absolute error (MAE), root mean squared error (RMSE), mean error (ME) and regression error characteristic (REC) curve).
Tipo: Nota Técnica/Nota Científica (ALICE) Palavras-chave: Base de dados de solos; Densidade de solo; REC curve; Model evaluation; Soil database; Tropical soil; Solo Tropical.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1095103
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How accurate are pedotransfer functions for bulk density for Brazilian soils? Scientia Agricola
Boschi,Raquel Stucchi; Bocca,Felipe Ferreira; Lopes-Assad,Maria Leonor Ribeiro Casimiro; Assad,Eduardo Delgado.
ABSTRACT: The aim of this study was to evaluate the performance of pedotransfer functions (PTFs) available in the literature to estimate soil bulk density (ρb) in different regions of Brazil, using different metrics. The predictive capacity of 25 PTFs was evaluated using the mean absolute error (MAE), mean error (ME), root mean squared error (RMSE), coefficient of determination (R2) and the regression error characteristic (REC) curve. The models performed differently when comparing observed and estimated ρb values. In general, the PTFs showed a performance close to the mean value of the bulk density data, considered as the simplest possible estimation of an attribute and used as a parameter to compare the performance of existing models (null model). The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: REC curve; Model evaluation; Soil database; Tropical soil.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100070
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Modeling and analysis of soybean (Glycine max. L) Cu/Zn, Mn and Fe superoxide dismutases Genet. Mol. Biol.
Ramana Gopavajhula,V.; Viswanatha Chaitanya,K.; Akbar Ali Khan,P.; Shaik,Jilani P.; Narasimha Reddy,P.; Alanazi,Mohammad.
Superoxide dismutase (SOD, EC 1.15.1.1) is an important metal-containing antioxidant enzyme that provides the first line of defense against toxic superoxide radicals by catalyzing their dismutation to oxygen and hydrogen peroxide. SOD is classified into four metalloprotein isoforms, namely, Cu/Zn SOD, Mn SOD, Ni SOD and Fe SOD. The structural models of soybean SOD isoforms have not yet been solved. In this study, we describe structural models for soybean Cu/Zn SOD, Mn SOD and Fe SOD and provide insights into the molecular function of this metal-binding enzyme in improving tolerance to oxidative stress in plants.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amino acid analysis; Model evaluation; Molecular modeling; Phylogenetic analysis; Superoxide dismutase (SOD).
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000200013
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Strategies to optimize modeling habitat suitability of Bertholletia excelsa in the Pan-Amazonia. Repositório Alice
TOURNE, D. C. M.; BALLESTER, M. V. R.; JAMES, P. M. A.; MARTORANO, L. G.; GUEDES, M. C.; THOMAS, E..
Aim: Amazon-nut (Bertholletia excelsa) is a hyperdominant and protected tree species, playing a keystone role in nutrient cycling and ecosystem service provision in Amazonia. Our main goal was to develop a robust habitat suitability model of Amazon-nut and to identify the most important predictor variables to support conservation and tree planting decisions. Localization: Amazon region, South America. Methods: We collected 3,325 unique Amazon-nut records and assembled >100 spatial predictor variables organized across climatic, edaphic, and geophysical categories. We compared suitability models using variables (a) selected through statistical techniques; (b) recommended by experts; and (c) integrating both approaches (a and b). We applied different...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Expert knowledge; Maximum entropy; Model evaluation; Protected Amazonian species; Spatial filtering; Species distribution model; Conhecimento especializado; Entropia máxima; Avaliação de modelo; Análise de componentes principais; Filtragem espacial; Modelo de distribuição de espécie; Castanha; Principal component analysis.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114461
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