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| Registros recuperados: 252 | |
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| Valente,Domingos S. M.; Queiroz,Daniel M. de; Corrêa,Paulo C.; Silva,Luis C. da; Vale,Sônia M. L. R. do. |
| Many research works have being carried out on analyzing grain storage facility costs; however a few of them had taken into account the analysis of factors associated to all pre-processing and storage steps. The objective of this work was to develop a decision support system for determining the grain storage facility costs and utilization fees in grain storage facilities. The data of a CONAB storage facility located in Ponta Grossa - PR, Brazil, was used as input of the system developed to analyze its specific characteristics, such as amount of product received and stored throughout the year, hourly capacity of drying, cleaning, and receiving, and dispatch. By applying the decision support system, it was observed that the reception and expedition costs were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Costs; Modeling; Software. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000400012 |
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| MOREIRA, J. M. M. A. P.; RODRIGUEZ, L. C. E.. |
| Modelos de planejamento florestal com restrições espaciais resultam em problemas matemáticos combinatoriais de difícil resolução. O procedimento mais apropriado, neste caso, é desenvolver métodos heurísticos, em vez das técnicas tradicionais de programação linear. O objetivo deste trabalho é aplicar, aprimorar e avaliar o desempenho da heurística denominada RazaoR (NOBRE e RODRIGUEZ, 2005), desenvolvido para a solução de problemas de planejamento florestal formulados integralmente com variáveis binárias e de acordo com o modelo Tipo I (JOHNSON e SCHEURMAN, 1977 apud CLUTTER et al., 1992, p. 281). O método incorpora restrições espaciais de conectividade entre os fragmentos de vegetação nativa adjacentes às florestas de produção. O déficit de conectividade... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Manejo florestal; Heurística; Modelagem; Heuristic; Forestry; Modeling; Planning. |
| Ano: 2010 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/873623 |
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| Kangas, Katja M; Natural Resources Institute Finland, Oulu; katja.kangas@luke.fi; Tolvanen, Anne; Natural Resources Institute Finland, Oulu; Department of Ecology, University of Oulu; anne.tolvanen@luke.fi; Tarvainen, Oili; Natural Resources Institute Finland, Oulu; oili.tarvainen@luke.fi; Nikula, Ari; Natural Resources Institute Finland, Rovaniemi; ari.nikula@luke.fi; Nivala, Vesa; Natural Resources Institute Finland, Rovaniemi; vesa.nivala@luke.fi; Huhta, Esa; Natural Resources Institute Finland, Rovaniemi; esa.huhta@luke.fi. |
| We present a new method for ecologically sustainable land use planning within multiple land use schemes. Our aims were (1) to develop a method that can be used to locate important areas based on their ecological values; (2) to evaluate the quality, quantity, availability, and usability of existing ecological data sets; and (3) to demonstrate the use of the method in Eastern Finland, where there are requirements for the simultaneous development of nature conservation, tourism, and recreation. We compiled all available ecological data sets from the study area, complemented the missing data using habitat suitability modeling, calculated the total ecological score (TES) for each 1 ha grid cell in the study area, and finally, demonstrated the use of TES in... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Biodiversity; Conservation; Ecological value; Land use planning; Modeling; Spatial data; Tourism. |
| Ano: 2016 |
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| Bacher, Cedric; Baud, Jean-pierre; Bodoy, Alain; Deslous-paoli, Jean-marc; Dreno, Jean-paul; Heral, Maurice; Maurer, Daniele; Prou, Jean. |
| An assessment of the reared stocks of the Pacific oyster (Crassostrea gigas ) has been recently conducted on the major French areas of molluscs culture. The methodology proposed included both estimates of densities obtained by subsampling in the field, and aerial photographs which covered the cultivated, intertidal area. The size and the number of samples were designed to reach a precision of 10% on the final assessment in each area. The field work consisted in weighing and counting the oyster in unit areas of 0.5 m2 for the bottom culture or in trays or bags, for the off bottom technique. These results give a better knowledge of the technique evolution and of the general structures in the cultivated areas. |
| Tipo: Text |
Palavras-chave: Modeling; Estimation; Stocks; Crassostrea gigas; Oysters. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/1986/acte-2864.pdf |
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| Ndoye, S; Capet, Xavier; Estrade, Philippe; Machu, Eric; Kounta, L; Sow, B; Diakhate, M; Gayet, At. |
| The regional ocean circulation along the Southern Senegal shelf is studied using a numerical model for varying forcing fields during the upwelling season (November-May). The main objective is to study the shelf circulation of the marine environment in the Southern Senegal Upwelling Shelf (SSUS), the Lagrangian pathways by which waters are transported to the surface in the upwelling tongue and the fate of these waters. Model results are compared with hydrographic measurements during UPSEN2-ECOAO survey and satellite images datasets. The upwelling source waters and also the warm nearshore waters are analyzed, from a Lagrangian point of view, by computing the paths of particles that are passively advected by the regional ocean model velocity field (ROMS). It... |
| Tipo: Text |
Palavras-chave: Upwelling; Ocean circulation; Modeling; Coastal dynamics; Shelf; ROMS.. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00472/58346/60900.pdf |
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| Lynam, Timothy; Tropical Resource Ecology Program, University of Zimbabwe; tlynam@science.uz.ac.zw. |
| Zambezi Valley agro-ecosystems are environmentally, economically, and institutionally variable. This variability means that it is not possible to measure everything necessary to develop a predictive understanding of them. In particular, because people and their environments are constantly changing, what was measured yesterday may change by tomorrow. Here, I describe elements of the approach that I have developed to address this problem. Called DAAWN, for Detail as and When Needed, the approach advocates an iterative and multiscaled methodology in which we first capture as broad an understanding of the system as possible and then use awareness developed at this scale to identify where to focus subsequent, more detailed, investigations. Because we cannot... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Comples adaptive systems; Household and resource economics; Livelihood strategies; Modeling; Multi-agent simulation models; Natural resource use; Participatory systems analysis; Southern Africa; Spidergrams. |
| Ano: 1999 |
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| Aparecido,Lucas Eduardo de Oliveira; Batista,Rafael Madureira; Moraes,José Reinaldo da Silva Cabral de; Costa,Cícero Teixeira Silva; Moraes-Oliveira,Adriana Ferreira de. |
| Abstract: The objective of this work was to elaborate the agricultural zoning of climatic risk (ZARC) for Physalis peruviana, through the thermal and water requirements of the crop in Southeastern Brazil. Air temperature (TAIR) and precipitation (PYEAR) data from 1,530 meteorological stations covering the entire region were used. Regions were considered climatically favorable to Physalis peruviana when TAIR was between 13 and 18ºC and PYEAR between 1,000 and 2,000 mm per year. Regions where TAIR was above 30ºC or less than 13ºC were considered inapt. Maps were created with this information and used to identify climatic characteristics and to establish the agricultural aptitude classes, termed apt, inapt, and marginal for the cultivation of Physalis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate risk; Agrometeorology; Modeling; Big data. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000100900 |
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| Paulino,Silvia Elisandra Pasqua; Mourão Filho,Francisco de Assis Alves; Maia,Aline de Holanda Nunes; Avilés,Tatiana Eugenia Cantuarias; Dourado Neto,Durval. |
| The development of models that allow forecasting yield tendencies is important to all sectors of the citrus industry. This work evaluated the influence of meteorological variables in different phases of the crop cycle in order to propose empirical models to estimate the number of fruits per plant (NFP) of 'Valencia' and 'Hamlin' sweet oranges. NFP sampling data from the citrus juice industry of the State of São Paulo, on the total of 15 harvests (1990/91 to 2004/05), classified into three age classes, and meteorological data of maximum and minimum air temperature and rainfall of Limeira, SP, Brazil, were utilized. Correlation coefficients were initially computed between the number of fruits per plant and each meteorological variable used for water balance... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; Harvest; Modeling; Yield. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100001 |
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| Coelho,Anderson Prates; Faria,Rogério Teixeira de; Barbosa,Aline Michelle da Silva; Dalri,Alexandre Barcellos; Rosalen,David Luciano. |
| ABSTRACT One of the benefits of irrigation with wastewater in agriculture is the reduction in the use of mineral fertilizers and the increase in crop yield. For wastewater application, the use of remote sensing can help to define specific management areas. The aim of this study was to evaluate the yield and the growth of irrigated white oats (Avena sativa L.) with varying treated sewage effluent (TSE) levels. These attributes were then correlated with Normalized Difference Vegetation Index (NDVI) values obtained at four phenological stages of the crop and used to define critical limits of NDVI. The experiment consisted of five TSE treatments differing in irrigation depths (11, 31, 60, 87, and 100%). Mean NDVI values in the crop were determined with an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avena sativa L.; Biomass; Modeling; NDVI; Remote sensing. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000400553 |
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| Durgadoo, Jonathan V.; Loveday, Benjamin R.; Reason, Chris J. C.; Penven, Pierrick; Biastoch, Arne. |
| The Agulhas Current plays a crucial role in the thermohaline circulation through its leakage into the South Atlantic Ocean. Under both past and present climates, the trade winds and westerlies could have the ability to modulate the amount of Indian-Atlantic inflow. Compelling arguments have been put forward suggesting that trade winds alone have little impact on the magnitude of Agulhas leakage. Here, employing three ocean models for robust analysisa global coarse-resolution, a regional eddy-permitting, and a nested high-resolution eddy-resolving configurationand systematically altering the position and intensity of the westerly wind belt in a series of sensitivity experiments, it is shown that the westerlies, in particular their intensity, control the... |
| Tipo: Text |
Palavras-chave: Boundary currents; Meridional overturning circulation; Wind stress; Mesoscale models; Numerical analysis; Modeling. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00161/27247/25452.pdf |
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| CARGNELUTTI FILHO, A.; MALUF, J.R.T.; MATZENAUER, R.; STOLZ, A.P.. |
| O objetivo deste trabalho foi verificar, com dados de temperatura mínima média decendial do ar (Tm) de 41 municípios do Estado do Rio Grande do Sul, de 1945 a 1974, se a Tm pode ser estimada em função da altitude, latitude e longitude. Para cada um dos 36 decêndios do ano, realizaram-se análise de correlação, análise de trilha das variáveis causais - altitude, latitude e longitude - sobre o efeito Tm, e estimaram-se os parâmetros do modelo das equações de regressão linear múltipla, pelo método passo a passo, com teste para saída de variáveis, considerando Tm como variável dependente e altitude, latitude e longitude como variáveis independentes. Na validação dos modelos de estimativa da Tm, usou-se o coeficiente de correlação linear de Pearson, entre a Tm... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Modelagem; Clima; Temperatura do ar; Modeling; Climate; Air temperature. |
| Ano: 2006 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/108907 |
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| PAIXÃO, J. de S.; ANDRADE, C. de L. T. de; GARCIA Y GARCIA, A.; AMARAL, T. A.; STEIDLE NETO, A. J.; MARIN, F. R.. |
| ABSTRACT - Maize produced under rainfed conditions are highly affected by the inherent annual and intra-seasonal weather variability, especially dry spells, that affect productivity. One of the simplest strategies with virtually no cost to mitigate this problem is the determination of a sowing window. The objectives of this study were to: a) use the results of maize yield simulated with a process-based model to establish sowing windows and, b) compare our results with the current methodology employed by the Brazilian Ministry of Agriculture (MAPA). The CSM-CERES-Maize model was used to simulate scenarios of weekly sowing dates, under rainfed conditions, for selected counties of Minas Gerais State, Brazil. For each sowing date it was determined the yield... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Zea mays; Climate risk; Sowing window; Modeling; DSSAT. |
| Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1013807 |
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| Priour, Daniel; De La Prada, Amelia. |
| Measurements at sea during fishing trials on bottom trawl have revealed that the geometry of the trawl is affected by the catch. A series of 37 hauls of around 3 h were carried out during the French EFFICHALUT project. The aim of this project was to carry out improvements on the fishing gear in order to reduce energy consumption. For this project, numerous sensors were used: for bridle tension, door spread, vertical opening, and door attitude. The measurements show quite clearly that the door spread decreases and the bridle tension increases during most of the hauls. The door spread decreased by 1.35 m/h, with a standard deviation of 1.98 m/h while the top bridle tension increased by 47 kg/h, with a standard deviation of 59 kg/h. The mean catch per haul... |
| Tipo: Text |
Palavras-chave: Trawl; Data; Modeling; Door spread; Bridle tension; Catch weight. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00239/34990/33525.pdf |
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| NASSIF, D. S. P.; ASSAD, E. D.. |
| O objetivo deste trabalho é a determinação dos parâmetros que causam variações no CANEGRO, através da análise de sensibilidade, e a sua segregação pela avaliação de quanto sensível é cada parâmetro no modelo estudado. A análise de sensibilidade foi realizada com a cultivar brasileira de cana-de-açúcar SP 89-1115. Foram utilizados dados meteorológicos de temperatura máxima e mínima, precipitação e radiação solar global da estação meteorológica situada na Escola Superior de Agricultura ?Luiz de Queiroz? (ESALQ), da Universidade de São Paulo (USP) em Piracicaba, SP, Brasil, a 22° 42? 30? Sul e 47° 38? 00? Oeste, com altitude de 546 metros. |
| Tipo: Resumo em anais de congresso (ALICE) |
Palavras-chave: Modelo Canegro/DSSAT; Cana-de-açúcar; Índice de área foliar máximo; Massa fresca de colmo; Perfilhamento; Sugar cane; Modeling. |
| Ano: 2010 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/868637 |
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| Registros recuperados: 252 | |
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