|
|
|
| Registros recuperados: 223 | |
|
|
| Alves, Guiliano Rangel; Teixeira, Itamar Rosa; Melo, Francisco Ramos; Souza, Raniele Tadeu Guimarães; Silva, Alessandro Guerra. |
| The complexity of the statistical models used to estimate the productivity of many crops, including soybeans, restricts the use of this practice, but an alternative is the use of artificial neural networks (ANNs). This study aimed to estimate soybean productivity based on growth habit, sowing density and agronomic characteristics using an ANN multilayer perceptron (MLP). Agronomic data from experiments conducted during the 2013/2014 soybean harvest in Anápolis, Goiás State, B razil, were used to conduct this study after being normalized to an ANN-compatible range. Then, several ANNs were trained to choose the best-performing one. After training the network, a performance analysis was conducted to select the ANN with a performance most appropriate for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agronomia; Biometria modelagem e estatística Glycine max (L.) Merrill; Agronomic characteristics; Modeling; MLP; Perceptron. Produção vegetal. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35250 |
| |
|
|
| Alves, Guiliano Rangel; Teixeira, Itamar Rosa; Melo, Francisco Ramos; Souza, Raniele Tadeu Guimarães; Silva, Alessandro Guerra. |
| The complexity of the statistical models used to estimate the productivity of many crops, including soybeans, restricts the use of this practice, but an alternative is the use of artificial neural networks (ANNs). This study aimed to estimate soybean productivity based on growth habit, sowing density and agronomic characteristics using an ANN multilayer perceptron (MLP). Agronomic data from experiments conducted during the 2013/2014 soybean harvest in Anápolis, Goiás State, B razil, were used to conduct this study after being normalized to an ANN-compatible range. Then, several ANNs were trained to choose the best-performing one. After training the network, a performance analysis was conducted to select the ANN with a performance most appropriate for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max (L.) Merrill; Agronomic characteristics; Modeling; MLP; Perceptron.; Produção vegetal. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35250 |
| |
|
|
| Langner,Josana Andreia; Streck,Nereu Augusto; Dalmago,Genei Antonio; Reiniger,Lia Rejane Silveira; Durigon,Angelica; Silva,Stefanía Dalmolin da; Lago,Isabel; Scheffel,Lúcio Gabriel; Poersch,Anderson Haas. |
| ABSTRACT: The objective of this study was to determine the maximum development rates for the phases of emergence, vegetative and reproductive, and to test the performance of the Wang and Engel (WE) model for simulating the development of landrace and improved maize cultivars sown on different dates. Model calibration was with data collected from a field experiment with a sowing date on December 13, 2014, and the model was tested with independent data from experiments with five sowing dates (August 20 and November 4, 2013, February 3 and August 15, 2014, and January 7, 2015) in Santa Maria, RS. The experiment was a complete randomized block design with four replicates. The dates of emergence (EM), silking (R1), and physiological maturity (R6) of two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L; Modeling; Phenology; Developmental stages. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001001737 |
| |
|
|
| Unigarro-Muñoz,Carlos Andrés; Hernández-Arredondo,Juan David; Montoya-Restrepo,Esther Cecilia; Medina-Rivera,Ruben Darío; Ibarra-Ruales,Lizardo Norbey; Carmona-González,Claudia Yoana; Flórez-Ramos,Claudia Patricia. |
| Allometric models based on measurements of single leaf dimensions or a combination there are useful tools for determining individual leaf area (LA) because they are non-destructive, precise, simple and economical methods. The present study was carried out at the Central Station Naranjal of Cenicafé, located in the Department of Caldas (Colombia), four models were defined using the variables length (L) and/or width (W) to estimate LA in coffee leaves of the Castillo® variety (Coffea arabica L.). Estimation of regression coefficients was performed using information recorded from 6,441 leaves (group 1), and their validation was performed using records from another 992 leaves (group 2). Leaves were collected from all strata of the canopy and ranged from 0.76... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Length; Width. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000400412 |
| |
|
|
| Lense,Guilherme Henrique Expedito; Moreira,Rodrigo Santos; Bócoli,Fernanda Almeida; Avanzi,Junior Cesar; Teodoro,Alexandre Elias de Miranda; Mincato,Ronaldo Luiz. |
| ABSTRACT Among the parameters considered by the Revised Universal Soil Loss Equation (RUSLE), the soil cover and management factor (C) is the main human influenced factor affecting the estimation of water erosion, and one of the most sensitive to spatiotemporal variations. Consequently, this study aims to compare the efficiency of C factor estimates obtained from the literature for each land-use class (Clit) and by calculation based on the Normalized Difference Vegetation Index (CNDVI). We test the hypothesis that soil loss estimates based on CNDVI approach are more accurate than those based on Clit. Water erosion was estimated based on soil morphological, physical, and chemical properties in addition to climate, relief, management practices, and land use... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Water erosion; Modeling; RUSLE. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100214 |
| |
|
|
| Damour, Valentin. |
| This report is about the work realized during a part time training at Ifremer. The subject discussed in this paper will associate the maritime field and the computer science field. It proves that computer science is really a multipurpose domain. In a context of global warming and human pressure (pollution and ressources over-exploitation), the marine ecosystem is jeopardized. In order to have a better understanding of the situation of this habitat and to stem these brutal changes, it is important to observe and gather information about it. It is exactly the goal of the project I took part in. This project mainly deals with observing sea turtles in their natural habitat. Thoses observations are realized thanks to LoRa equiped tags which are implanted on... |
| Tipo: Text |
Palavras-chave: Réseau tolérant au délai; Océan Indien; Tortues marines; Modélisation; Delay-tolerant network; Indian Ocean; Sea turtles; Modeling. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00612/72364/71279.pdf |
| |
|
|
| Dange, Catherine. |
| Most of trace elements have a non conservative behavior in estuarine environments. It is the case of cadmium, cobalt and caesium for which the fate in estuarine and coastal zones is largely controlled by their distribution between water and suspended particles, which generally have high residence times or can be definitely deposited in these areas. Metallic contaminants and radionuclides can be present under various species : dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated) or integrated by various mechanisms in the organisms. Such distributions are the result of processes (physical, chemical, biological) which are controlled by many factors (ionic strengh, pH, Eh, major cations concentration, nature and... |
| Tipo: Text |
Palavras-chave: Modeling; French estuaries; Caesium; Cobalt; Cadmium; Radionuclides; Trace metals; Speciation; Modélisation; Estuaires français; Cesium; Cobalt; Cadmium; Radionucléides; Métal trace; Speciation. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/these-183.pdf |
| |
|
|
| Waldhardt, Rainer; Landscape Ecology and Landscape Planning, Justus-Liebig-University Giessen; rainer.waldhardt@umwelt.uni-giessen.de; Bach, Martin; Resources Management, Justus-Liebig-University Giessen;; Breuer, Lutz; Resources Management, Justus-Liebig-University Giessen;; Frede, Hans-Georg; Resources Management, Justus-Liebig-University Giessen;; Ginzler, Oliver; Landscape Ecology and Landscape Planning, Justus-Liebig-University Giessen;; Gottschalk, Thomas; Animal Ecology, Justus-Liebig-University Giessen;; Julich, Stefan; Resources Management, Justus-Liebig-University Giessen;; Krumpholz, Matthias; Agribusiness Management, Justus-Liebig-University Giessen;; Kuhlmann, Friedrich; Agribusiness Management, Justus-Liebig-University Giessen;; Otte, Annette; Landscape Ecology and Landscape Planning, Justus-Liebig-University Giessen;; Reger, Birgit; Landscape Ecology and Landscape Planning, Justus-Liebig-University Giessen;; Reiher, Wolfgang; Resources Management, Justus-Liebig-University Giessen;; Schmitz, Kim; Agricultural and Development Policy, Justus-Liebig-University Giessen;; Schmitz, P. Michael; Agricultural and Development Policy, Justus-Liebig-University Giessen;; Sheridan, Patrick; Agribusiness Management, Justus-Liebig-University Giessen;; Simmering, Dietmar; Landscape Ecology and Landscape Planning, Justus-Liebig-University Giessen;; Weist, Cornelia; Biometry and Population Genetics, Justus-Liebig-University Giessen;; Wolters, Volkmar; Animal Ecology, Justus-Liebig-University Giessen;. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Agriculture; Ecosystem services; Germany; Modeling; Sustainability. |
| Ano: 2010 |
|
| |
|
|
| Cunha,Daniel de Noronha Figueiredo Vieira da; Pereira,José Carlos; Campos,Oriel Fajardo de; Braga,José Luis; Silva,Fabyano Fonseca e; Martuscello,Janaina Azevedo. |
| The objective of this study was to develop and to evaluate a dynamic simulation model, with stochastic components in order to assess milk production systems. The simulation model was developed by using STELLA 9.0, ZooCalc 1.0 and electronic data sheets. The physical structure of the herd was divided into 15 interlinked modules that represented categories or subdivisions of categories. Mathematical models obtained from the literature were used to simulate the body weight of growing and lactating animals and milk production and milk composition. Electronic data sheets were used to calculate the nutritional requirements and dietary balance. After cost minimization, each feed was evaluated by using ZooCalc 1.0. Some average responses of farm size, zootechnical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy cattle; Modeling. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400027 |
| |
|
|
| Faria,Rogério Teixeira de; Bowen,Walter Truman. |
| The performance of the soil water balance module (SWBM) in the models of DSSAT v3.5 was evaluated against soil moisture data measured in bare soil and dry bean plots, in Paraná, southern Brazil. Under bare soil, the SWBM showed a low performance to simulate soil moisture profiles due to inadequacies of the method used to calculate unsaturated soil water flux. Improved estimates were achieved by modifying the SWBM with the use of Darcy's equation to simulate soil water flux as a function of soil water potential gradient between consecutive soil layers. When used to simulate water balance for the bean crop, the modified SWBM improved soil moisture estimation but underpredicted crop yield. Root water uptake data indicated that assumptions on the original... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil moisture; Dry Bean; Modeling. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400001 |
| |
|
|
| Chung, S.W.; Gassman, Philip W.; Huggins, David R.; Randall, G.W.. |
| The Erosion Productivity Impact Calculator (EPIC) model was tested using four years of field data collected at a site near Lamberton, Minnesota, under three different crop rotations: continuous corn (Zea mays L.) or CC, soybean (Glycine max L.)-corn (SC), continuous alfalfa (Medicago sativa L.) or CA. The model was evaluated by comparing measured versus predicted subsurface drainage flow (tile flow), nitrate-nitrogen (NO3-N) loss in tile flow, residual NO3-N in the soil profile, crop N uptake, and yield. Initially, EPIC was run using standard Soil Conservation Service (SCS) runoff curve numbers (CN2) suggested for the soil type at the site. Two different SC runs were performed with a nitrogen fixation parameter denoted as parm(7) set at either 1.0 or 0.3,... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Modeling; Water quality; Crop rotation; Tile drainage; Nitrate leaching; Fertilizer; Crop Production/Industries. |
| Ano: 2000 |
URL: http://purl.umn.edu/18479 |
| |
|
|
| Fernandes,Henrique Jorge; Tedeschi,Luis Orlindo; Paulino,Mário Fonseca; Detmann,Edenio; Paiva,Luisa Melville; Valadares Filho,Sebastião de Campos; Silva,Aline Gomes da; Azevêdo,José Augusto Gomes. |
| The objective of this study was to evaluate the use of different mathematical models to describe growth of grazing beef cattle. Data of 20 Nellore bulls with initial weight of 129±28.1 kg and final weight of 405±62.0 kg were used. The animals were randomly divided into four plots and placed on B. decumbens Stapf pastures. Three plots received concentrate supplement with different protein profiles and the fourth plot received only mineral supplement. Animals were weighed every 28 days to design growth curve of full body weight. Five mathematical models were evaluated to describe animal growth: Multiphase, Linear, Logarithmic, Gompertz and Logistic models. Assessment of adequacy of the models was performed by using coefficient of determination, simultaneous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Grazing beef cattle; Modeling; Seasonality. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200020 |
| |
|
|
| Blouin, Arthur; Imbert, Patrice; Sultan, Nabil; Callot, Jean-paul. |
| The morphology of mud volcanoes (MV) has been extensively studied over the last few decades. Although recent research has begun to focus on deep processes and structures, little is known about mud generation mechanisms. This study aims to investigate the feeder system and formation of an active kilometer‐scale MV by relying on a 3‐D seismic survey and an in‐situ dataset on the Absheron anticline (South Caspian Basin). Seismic data show a depleted area in the Anhydritic Surakhany Formation (ASF), whose mineralogical composition fits with surface mud. Well data show that the ASF is a succession of evaporitic beds and low temperature shales near its fracture pressure. Biostratigraphic analysis confirms a Pliocene origin for the mud, suggesting that the ASF... |
| Tipo: Text |
Palavras-chave: Mud volcano; Pore pressure; Methane; Modeling; Seismic. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00481/59304/62057.pdf |
| |
|
|
| Veiga,Diogo Fernando; Cecconello,Pedro de Stege; Lucca,José Eduardo de; Porto,Luismar Marques. |
| In this work we developed an extension of IsaViz software, a RDF (Resource Description Framework) authoring tool, designed to be a graphical environment to build models of metabolic and regulatory networks. This environment, called Metabolic IsaViz, was linked to a genomic library of types and was modeled on the basis of ontologies. Biochemical pathways included data at sequence level (e.g., the amino acid sequence of enzymes), besides kinetic and thermodynamic parameters for the reactions. Models created with Metabolic IsaViz could be exported to pathways simulators through SBML (Systems Biology Markup Language), which allowed to analyze the pathway dynamics of target chemicals. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metabolic and Regulatory Pathways; RDF/XML; Modeling. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000400025 |
| |
|
|
| Maia,Celsemy Eleutério. |
| Leaf analysis is the chemical evaluation of the nutritional status where the nutrient concentrations found in the tissue reflect the nutritional status of the plants. Thus, a correct interpretation of the results of leaf analysis is fundamental for an effective use of this tool. The purpose of this study was to propose and compare the method of Fertilization Response Likelihood (FRL) for interpretation of leaf analysis with that of the Diagnosis and Recommendation Integrated System (DRIS). The database consisted of 157 analyses of the N, P, K, Ca, Mg, S, Cu, Fe, Mn, Zn, and B concentrations in coffee leaves, which were divided into two groups: low yield (< 30 bags ha-1) and high yield (> 30 bags ha-1). The DRIS indices were calculated using the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Nutritional status; DRIS. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200013 |
| |
|
|
| Deus,José Aridiano Lima de; Soares,Ismail; Neves,Júlio César Lima; Medeiros,José Francismar de; Miranda,Fábio Rodrigues de. |
| Melon is one of the most demanding cucurbits regarding fertilization, requiring knowledge of soils, crop nutritional requirements, time of application, and nutrient use efficiency for proper fertilization. Developing support systems for decision-making for fertilization that considers these variables in nutrient requirement and supply is necessary. The objective of this study was parameterization of a fertilizer recommendation system for melon (Ferticalc-melon) based on nutritional balance. To estimate fertilizer recommendation, the system considers the requirement subsystem (REQ), which includes the demand for nutrients by the plant, and the supply subsystem (SUP), which corresponds to the supply of nutrients through the soil and irrigation water. After... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucumis melo L; Nutrient demand; Nutrient supply; Modeling. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200498 |
| |
|
|
| Azizpour, Mehran; Mohebbi, Mohebbat; Khodaparast, Mohammad Hossein Haddad; Varidi, Mehdi. |
| The effects of water: shrimp ratio and xanthan gum (XG) concentration on characteristics of shrimp foam were investigated. Foams were prepared from shrimp puree by adding several xanthan gum concentrations (0.1, 0.2, 0.3 % w/w), water: shrimp ratios (2:1, 3.5:1, 5:1 w/w) and whipped for five minutes. Incorporation of 0.2% w/w XG with 3.5:1 w/w water: shrimp ratio was selected because of having better characteristics of produced foams and then dried at 50, 60 and 70°C. Results showed that stability and density of foam increased with increasing xanthan gum concentration. However, increasing water : shrimp ratio caused to decrease in stability and density of foam. As the temperature increased from 50 to 70°C, the drying time decreased to 55 minutes.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Activation energy; Effective diffusivity; Foam-mat drying; Foam characteristics; Modeling; Shrimp. |
| Ano: 2013 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2339 |
| |
|
| |
|
|
| Riitters, Kurt; U.S. Forest Service; kriitters@fs.fed.us; Wickham, James D; U.S. Environmental Protection Agency, National Exposure Research Laboratory; wickham.james@epa.gov; O'Neill, Robert; ; eoneill@attglobal.net; Jones, K. Bruce; U.S. Environmental Protection Agency, National Exposure Research Laboratory; jones.bruce@epa.gov; Smith, Elizabeth; U.S. Environmental Protection Agency, National Exposure Research Laboratory; smith.betsy@epa.gov. |
| We report an analysis of forest fragmentation based on 1-km resolution land-cover maps for the globe. Measurements in analysis windows from 81 km 2 (9 x 9 pixels, “small” scale) to 59,049 km 2 (243 x 243 pixels, “large” scale) were used to characterize the fragmentation around each forested pixel. We identified six categories of fragmentation (interior, perforated, edge, transitional, patch, and undetermined) from the amount of forest and its occurrence as adjacent forest pixels. Interior forest exists only at relatively small scales; at larger scales, forests are dominated by edge and patch conditions. At the smallest scale, there were significant differences in fragmentation among continents; within continents,... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Biogeography; Edge effect; Forest fragmentation; Geographic information systems; Global patterns; Land-cover map; Landscape ecology; Modeling; Perforated forest; Remote sensing; Satellite imagery; Spatial pattern. |
| Ano: 2000 |
|
| |
|
|
| Soares,Daniel Jorge; Oliveira,Wladecir Salles de; Uzuele,Elvio Lorençato; Carvalho,Saul Jorge Pinto de; Ovejero,Ramiro Fernando Lopez; Christoffoleti,Pedro Jacob. |
| Abstract: The objective of this work was to evaluate the growth and development of a glyphosate-resistant population of Conyza bonariensis in different sowing dates (autumn, winter, and spring) and in two agricultural environments, based on days or thermal units. Five experiments were performed in two agricultural environments in Brazil: two in the municipality of Não-Me-Toque, in the state of Rio Grande do Sul - with sowings in July and September 2011; and three in the municipality of Santa Cruz das Palmeiras, in the state of São Paulo ‒ with sowings in April, July, and September 2011. In each trial, ten evaluations of the phenological development and total dry mass of C.bonariensis were performed, fitting these variables to a unit of time in days or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hairy fleabane; Dry mass; Growing degree days; Modeling; Phenology; Weed biology.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000100045 |
| |
| Registros recuperados: 223 | |
|
|
|
