Search results for "Earth"
showing 10 items of 12204 documents
Husk Energy Supply Systems for Sunflower Oil Mills
2020
Together with solar, wind, and hydro renewable energy sources (RES), biomass constitutes an integral part of the high-renewables electricity systems. Considerable feedstocks for electricity generation are process-based residues. Ukraine is the world leader in sunflower seed production, therefore, husk (a by-product of oil production) is a promising biofuel for combustion- based power plants. The plants consume primarily electricity and fossil fuels (natural gas or fuel oil) for steam production. Their usage affects the edible oil production cost and impacts on climate change. The above facts force us to look for alternatives. By-product (husk) utilization can reduce exhaustible energy consu…
La Formation et la Reproduction des capacités humaines dans la pensée de Romano Alquati
2022
L’article traite de l’importance assumée par la question de la formation (de la reproduction à la capacité active vivante), dans la dernière période de Romano Alquati. On aborde également le problème de l’appauvrissement de la subjectivité qui, selon l’auteur, serait provoquée par la numérisation des processus d’éducation. The essays deals with the centrality increasingly assumend by the thems of training (the reproduction of active living working capacity) in the last Alquati, as well as the impoverishment of subjectivities that, according to this author, would occur with the digitation of many educational processes.
Contour map of the top of the regional geothermal reservoir of Sicily (Italy).
2015
An integrated review of existing geological and geophysical data – partly acquired during oil and gas exploration – combined with new data provided by deep geothermal studies of selected key areas, was used for the 3D modeling and mapping of the top of the geothermal reservoir developed at a regional scale in Sicily (Central Mediterranean). The resulting 1:500,000 scale map covers the area of the whole Sicily (about 25,700 km2) and is devoted to represent the main input for both the thermal modeling and the evaluation of geothermal potential at a regional scale. As the map indicates the distribution at depth of a likely target for geothermal drilling, it can be also used as a rough indicato…
Determination of Changes in the Quality of Surface Water in the River—Reservoir System
2021
Assessing the changing parameters of water quality at different points in the river–reservoir system can help prevent river pollution and implement remedial policies. It is also crucial in modeling water resources. Multivariate statistical analysis is useful for the analysis of changes in surface water quality. It helps to identify indicators that may be responsible for the eutrophication process of a reservoir. Additionally, the analysis of the water quality profile and the water quality index (WQI) is useful in assessing water pollution. These tools can support and verify the results of a multivariate statistical analysis. In this study, changes in water quality parameters of the Turawa r…
Dynamics of hydrofracturing and permeability evolution in layered reservoirs
2015
International audience; A coupled hydro-mechanical model is presented to model fluid driven fracturing in layered porous rocks. In the model the solid elastic continuum is described by a discrete element approach coupled with a fluid continuum grid that is used to solve Darcy based pressure diffusion. The model assumes poro-elasto-plastic effects and yields real time dynamic aspects of the fracturing and effective stress evolution under the influence of excess fluid pressure gradients. We show that the formation and propagation of hydrofractures are sensitive to mechanical and tectonic conditions of the system. In cases where elevated fluid pressure is the sole driving agent in a stable tec…
A study of the behaviour of earth electrodes connected together in resonant earthed neutral systems
2005
Inside urban areas the earth electrodes of the MV/lv substations are often electrically connected together so as to form a single extended earthing system. The advantages of the realization of an extended earthing system are the reduction of the current that each substation earth electrode injects in the soil during the fault and a better uniformity of the voltages to earth inside the urban area. In previous works, models for the study of extended earthing systems have been proposed. These models were valid for the case of single-line-to earth fault in isolated neutral MV networks. In this paper, the extended earthing system is analyzed in the case of a resonant earthed neutral MV network. …
La responsabilitat social universitària i la construcció d’una societat per a totes les edats
2019
espanolEl presente ensayo ofrece una reflexion sobre el rol que puede ejercer la responsabilidad social universitaria en la construccion de una sociedad para todas las edades, concepto propuesto por Naciones Unidas (1995a; 2003) e inspirado en los principios de respeto, proteccion, solidaridad intergeneracional e inclusion de las personas mayores. Durante anos las personas mayores representaron un grupo minoritario excluido y socialmente estigmatizado. En virtud de los avances cientificos y tecnologicos que han prolongado la vida, el progresivo aumento del numero de aquellas, a nivel mundial, ha suscitado la creacion de politicas en favor del respeto e igualdad social, que frenen la reprodu…
Educate to coexist with the flood risk
2020
In the Mediterranean region, floods are the main natural risk. This hazard has been aggravated in recent decades by the increase in exposure of the human being and is expected to increase the danger according to the forecast of climate change scenarios. For this reason, dealing with these issues in the classroom and the training of teachers on this subject should be a priority, as established in the curriculum of Primary Education (Social Sciences). The objectives of this research are: 1) To analyze the knowledge that future teachers have about the risk of flooding to develop these contents in the classroom; 2) Check the relevance that they give to this social-environmental problem; and 3) …
The Effect of Mechanocatalytic Pretreatment on the Structure and Depolymerization of Willow
2020
In this study, the effect of a mechanocatalytic pretreatment on the structure of willow and sugar release from pretreated willow was explored. In the mechanocatalytic approach, the pretreatment consists of solvent-free impregnation with sulfuric acid and a mechanical treatment with ball milling. Willow sawdust and pretreated samples were analyzed with field emission scanning electron microscope and X-ray diffraction. The products in the sugar solution were determined as the total reducing sugars with the 3,5-dinitrosalicylic acid method and monosaccharides with capillary electrophoresis. According to the results, milling increased the sugar production, depending on the sulfuric acid load. T…
Investigation of a Gravel-Bed River’s Pattern Changes: Insights from Satellite Images
2021
Changes in river pattern have been documented in the literature. The recognition of islands and vegetated patches, which is indicative of the evolution processes, requires simultaneous information at different points and at different times and field studies are still difficult and scarce. The present work, focusing the attention on a gravel-bed river, explores the possibility to conduct a first-step pattern changes analysis by identifying the evolution of the morphological features and taking information of islands and vegetated patches from satellite images easily available from Google Earth. The study is conducted by combining the information taken from both the satellite images and the f…