University Gante

Gent, Belgium

University Gante

Gent, Belgium
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Rey J.C.,INIA CENIAP | Rodriguez M.F.,INIA CENIAP | Cortez A.,INIA CENIAP | Lobo D.,Central University of Venezuela | And 3 more authors.
Bioagro | Year: 2012

The distribution and aggressiveness of the precipitation in Los Andes region of Venezuela was evaluated by analyzing monthly precipitation data from 56 meteorological stations. The modified Fournier index (FMI) and precipitation concentration index (PCI) were calculated to assess rain aggressiveness and rain distribution, respectively. The index values were analyzed using univariate and geostatistical analysis adjusting semivariograms to theoretical models. For mapping of the spatial distribution of indices punctual kriging interpolation method was carried out, generating the appropriate file, which was finally edited in ArcView. The results pointed out that the region under study has high and very high rainfall aggressiveness over 70% of the entire territory, while the distribution of rainfall was moderately seasonal. Rainfall aggressiveness, in combination with the predominance of a sloped relief increases the risks of soil degradation, with the annual rainfall ranging from 500 to 3900 mm. In this sense, soil conservation practices should be considered on existing crop production systems in the evaluated region.

Cortez A.,Instituto Nacional Of Investigaciones Agricolas | Rodriguez M.F.,Instituto Nacional Of Investigaciones Agricolas | Rey J.C.,Instituto Nacional Of Investigaciones Agricolas | Lobo D.,Central University of Venezuela | And 3 more authors.
Bioagro | Year: 2011

In order to assess the aggressiveness and concentration of precipitation in the Northwestern Region of Venezuela, the monthly precipitation data from 69 meteorological stations of Zulia, Falcón, Lara and Yaracuy States were analyzed. The modified Fournier index (IFM) was calculated to estimate the rain aggressiveness, and the precipitation concentration index (ICP) that estimates the rainfall distribution. The values were analyzed using univariated and geostatistical analysis. For mapping climate variables a kriging interpolation method was performed, and the resulting file was edited with ArcView. The results allowed the analysis of the variability of IFM and ICP, finding that in the north (the Guajira and the North and Northwest coast of Falcon State) the rainfall is moderately seasonal to seasonal, while at the South of the studied area, where precipitation values range from 1240 to 2260 mm per year, the ICP has moderately seasonal values, but with very high aggressiveness. A high proportion of precipitation has high to very high IFM values, where the soils of the Western region are greatly vulnerable to degradation by the effect of rainfall erosivity.

Rodriguez M.F.,INIA CENIAP | Cortez A.,INIA CENIAP | Rey J.C.,INIA CENIAP | Lobo D.,Central University of Venezuela | And 4 more authors.
Bioagro | Year: 2011

In order to evaluate the distribution and aggressiveness of the precipitation in the Southeast region of Venezuela (Guayana and the Orinoco Delta), we performed an analysis of monthly precipitation data from 41 meteorological stations, and the Precipitation Concentration Index (PCI) and Modified Fournier Index (MFI) were calculated. The index values were evaluated using univariate and geostatistical analysis, adjusting semivariograms to theoretical models. For mapping the spatial distribution of the indices, interpolation by punctual kriging method was carried out, generating the appropriate file, which was edited in ArcView. It was found that rainfall has a very high aggressiveness (values of MFI classified as very high). The distribution of rainfall was moderately seasonal in 91 % of the entire territory, and only in the Northwestern of Amazonas State and Central North of Bolivar State, precipitation presented a seasonal distribution. It is concluded that soils of most part of the region are greatly vulnerable to erosion by effect of rainfall.

Lobo D.,Central University of Venezuela | Cortez A.,INIA CENIAP | Rodriguez M.F.,INIA CENIAP | Ovalles F.,INIA CENIAP | And 3 more authors.
Bioagro | Year: 2010

The delineation of zones with different precipitations can be considered as basis for sustainable land use and management. With the objective to evaluate the aggressiveness and concentration of the precipitation in Los Llanos region of Venezuela, monthly precipitation data coming from 96 weather stations were analyzed by calculating the modified Fournier index (MFI) and the precipitation concentration index (PCI). The values were subjected to univariated and geostatistical analysis. For mapping the precipitation variable, kriging was used for interpolation and the results edited with ArcView. It was found that a zone with high precipitation concentration and aggressiveness exists in the center of the study area, including the central-south region of Guárico State, the West part of Anzoátegui State and the East part of the Apure and Barinas States, while in the rest of the area a combination of moderate seasonal precipitation with high to very high rain aggressiveness can be considered.

In this paper are presented the obtained results in the development and partial validation of an analytical method for determination of PCBs present in transformer oils. The method is based in the PCBs liquid-liquid extraction from oil transformer using n-hexane as solvent and the later determination of PCBs for gas chromatographic with flame ionization detector. Aroclor 1254 was used as secondary standard. To evaluate the linearity of the system and the method seven dissolutions between 10 and 1000 ug/mL of concentration were prepared. The resulting calibration curve presents a lineal behavior in the studied interval of concentration with a correlation coefficient R 2 of 0.9992. The method shows a good reproducibility in the injection with a variation coefficient smaller that 5%, good exactitude and high recuperation percent. The detection limit was smaller than 20 μg/mL. Finally, the method validated was used for the determination of PCBs concentration in oil samples from out of service transformers.

Villar M.M.P.,Santa Clara University | Dominguez E.R.,Santa Clara University | Tack F.,University Gante | Vandemoortel A.,University Gante
Afinidad | Year: 2011

Parameters were determined (pH, electrical conductivity, organic matter, total carbon, cation exchange capacity, total nitrogen, ammonia nitrogen and total phosphorus) in the two types of soils before and after being used as substrates in the filter, metal analysis was performed by atomic emission and Statgraphics centurion XV.II software was used for statistical treatment. Significant differences between the substrates before and after being used in the experiment for phosphorus and ammonia nitrogen was obtained, showing an increase of phosphorus and a decreased of ammonia nitrogen, while the total nitrogen concentration was stable before and after the experiment. The values of pH and electrical conductivity showed a decrease in soil after being used as a substrate of the filters, while the organic matter, carbonate content and cation exchange capacity was not affected. We conclude that the high content of iron in the red ferralitic soil favours the phosphorus adsorption and nitrification reactions occur in the filters by ammonia nitrogen decrease in both substrates.

Goyos L.,Polytechnic University José Antonio Echeverría | Varela A.,University of La Coruña | Verhaege M.,University Gante | Garcia A.,University of La Coruña | And 2 more authors.
Revista de Metalurgia | Year: 2012

The influence of silicon content and heat treatment on microstructure, abrasive and dry friction wear resistance of a 3 % C, 12 % Cr cast iron, under fast solidification conditions is studied. The fast solidification condition diminishes the carbide volume and the silicon content increases their dispersion and finesses. All matrixes obtained were perlitics, whit different finesses. No intermediate transformation products were noticed. Hardness had little variation. Austenization treatment show little affectivity, with tendency to increase wear in reference to as cast and maintenance treatments. Behavior under dry friction and abrasive wear were similar under test conditions applied whit more influence of carbide morphology in the abrasive wear conditions.

Gutierrez G.,Polytechnic University José Antonio Echeverría | Ortega D.R.,Polytechnic University José Antonio Echeverría | Iznaga A.M.,Polytechnic University José Antonio Echeverría | De Beule M.,University Gante | And 6 more authors.
Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria | Year: 2015

The shoulder is one of the most complex systems in the human body. To know how its work is essential to understand the biomechanics of the body. The purpose of this study was to analyze the influence of Local Coordinate Systems in the kinematic analysis of GlenoHumeral joint. The motion tracking was performed using passive sensors attached to pins. Trabecular pins were placed on the shoulder and scapula. The data processing was performed using the free open software pyFormex. The joint displacements were determined by two different variants of Coordinate Systems, being detected a difference from 2 to 12 degrees. © 2015 CIMNE (Universitat Politècnica de Catalunya).

This synopsis of the Argentinean species of Peperomia includes 35 taxa, 10 excluded names (P. alata, P. blanda, P. boliviensis, P. effusa, P. hilariana, P. hispidula var. hispidula, P. rhombea, P. rusbyi, P. serpens and P. silvarum), and nine new synonyms (P. misionense under P. arifolia; P. comarapana f. pubescens under P. comarapana; P. mandonii, P. mandonii var. excelsis, P. umbelliformis, P. non-hispidula under P. crystallina; P. lilloi and P. sanpedritoi under P. santaelisae and, P. subpubistachya under P. urocarpa). Four new species are cited for the Argentinean flora (P. crystallina, P. diaphanoides, P. increscens and P. trineuroides). Twenty names were lectotypified and one was neotypified. Treatment of each entity includes synonymy, iconography, vernacular names, distribution and habitat, observations and representative specimens examined. A key to the identification of the taxa and illustrations are also provided.

For organizations providing supports to persons with intellectual disability it is their main task to enhance the quality of life of their clients. Individual Support Plans should be designed with this goal in mind. Consequently, important questions in writing an ISP are: 1) What does the person want?, and 2) Which support does the person need? The outcome should obviously be a good quality of life. Furthermore we emphasize in our work the importance of evidence-based practices. Based on these starting points we propose the following guideliness for an ISP. An ISP should: - Explore goals and personal perspectives: what does a person want in his life. - Explore what support a person needs and wants: which supports are important for and which are important to the person. - Formulate support strategies in answer to the personal goals, wants and needs. - Monitor in dialogue with the person the process of support. - Measure personal outcomes. - Comprise an ongoing system of finetuning and adjusting. - Use evidence based practices in doing so. - Be transparant and comprehensible for the person. Following these guideliness we developed an internet based ISP in which the eight QOL dimensions provide the framework for developing support strategies, the dialogue with the client is build into the system of supports, and evidence based instruments are used to measure support needs and personal outcomes. © Ediciones Universidad de Salamanca.

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