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Catana I.,Polytechnic University of Bucharest | Safta C.-A.,Polytechnic University of Bucharest | Panduru V.,Ecological University of Bucharest
UPB Scientific Bulletin, Series D: Mechanical Engineering | Year: 2010

The paper presents a method of power optimization of the wind turbines by changing the pitch angle. There are analysed the structure and the performance of a electro-mechanical servomechanism used to put on position the wind turbine blades so that a maxim out power could be obtained at a given wind speed. Numerical simulations validated the applied method, and the results obtained are comparable with the ones from technical literature. Source

Tevi G.,Ecological University of Bucharest | Scradeanu M.,University of Bucharest | Scradeanu D.,University of Bucharest
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM | Year: 2014

One of the most important environmental issues which Romania faces as member of the European area is land management and natural resources exploitation within protected areas. A good example is the Natura 2000 ROSCI0103 Lunca Buzaului (Buzău and Brăila Counties, Romania). This protected area was established with the purpose of conserving habitats and species characteristic of aquatic and riparian ecosystems, in a region with significant anthropic stress generated by alluvial deposits exploitation, waste storage, agricultural activity, and hydro energy producing potential. The need to put such area in value requires an integrated approach, based on the use of GIS and remote sensing data. In this study, the following resources have been used: Pléiades panchromatic and multispectral images at 0.5 and 2 m spatial resolution, orthophotos with a 2.5 m spatial resolution, a digital terrain model (DTM) based on a 30 m network, topographical plans with 1:5000 and 1:10000 scales, thematic vectors for land using – after Corine Land Cover 2006 data sets. The time difference in the acquirement of images, the exploitation of all the aforementioned data, provides the possibility of having a time scale perspective, between 1970 and 2012. The data have been processed using specific software – ArcGis 10.0 for management of spatially referenced data, ENVI EX for remote sensing data processing and RockWorks 12 for geological and hydrogeological data processing. In the next step, processed remote sensing data, correlated with field collected data has led to the following processes: • Design of the flooding areas, along Buzău River and an environmental impact assessment associated with different scenarios; • Evaluation of actual fluvial erosion processes for the Buzău River system, both under natural state and influenced by the alluvial material extraction activities which are taking place in the area. From geomorphological point of view, the specificity of this habitat is given by the pronounced dynamic processes and, consequently, by the necessity of efficient land management. The results related to the extension of flooding areas at different flow rates, morphological instability, and the presence of erosional risk sections, have been correlated with land use characteristics (from Corine Land Cover) for the entire studied region. Obtained results: GIS data base, flooding and geomorphological risk maps. All these are useful useful for developing effective management plans in order to achieve conservation objectives for species and habitats, for mitigating environmental impact, and for elaborating a geological resources sustainable exploitation strategy. © SGEM2014. Source

Vlad S.-N.,Ecological University of Bucharest
Central European Journal of Geosciences | Year: 2011

Romania has a genuine accumulation of "blind" porphyry CuAuMo systems associated with Cu skarns or AuAg (PbZn) epithermal vein sets. Many such hidden structures were discovered inadvertently during state exploration based on local tradition that Romanian Carpathians are rich in vein and skarn ore types. Notable dichotomy between porphyries associated with peripheral skarns versus epithermal ores is expressed by age (Mesozoic versus Tertiary), precious metal content, alteration types and zoning, shape/size and extension of ore bodies. Preliminary conclusions on metallic/alteration assemblages around porphyries in addition to geophysical information about inferred deep-seated Alpine plutonism promote potential exploration vectors for what will be an increasingly important deposit type in the future. © Versita Sp. z o.o. Source

Traditional agricultural practices based on non-customized irrigation and soil fertilization are harmful for the environment, and may pose a risk for human health. By continuing the use of these practices, it is not possible to ensure effective land management, which might be acquired by using advanced satellite technology configured for modern agricultural development. The paper presents a methodology based on the correlation between remote sensing data and field observations, aiming to identify the key features and to establish an interpretation pattern for the inhomogeneity highlighted by the remote sensing data. Instead of using classical methods for the evaluation of land features ( field analysis, measurements and mapping), the approach is to use high resolution multispectral and hyperspectral methods, in correlation with data processing and geographic information systems (GIS), in order to improve the agricultural practices and mitigate their environmental impact (soil and shallow aquifer). © IWA Publishing 2012. Source

Stefanescu L.,Babes - Bolyai University | Constantin V.,Babes - Bolyai University | Surd V.,Babes - Bolyai University | Ozunu A.,Babes - Bolyai University | And 2 more authors.
Carpathian Journal of Earth and Environmental Sciences | Year: 2011

The paper presents the application of the USLE methodology for the assessment of the soil erosion susceptibility in the Roşia Montanǎ mining perimeter, a 2000 year-old exploitation area. The peculiarities of the mountain topography and the vulnerability induced by the mining activities have caused the occurrence of soil erosion in significant areas. The identification and assessment in quantitative terms of these areas is vital from the mining structures physical stability point of view and that of environmental safety in the investigated region. The soil loss assessment is also considered in terms of Natech events (natural hazards trigger technological accidents), which combine the natural and technological components of a disaster. The results of the study illustrate the fact that the highest values of soil erosion are located in the open pit and waste heaps area, inducing the risk of physical collapse of waste heaps, especially if triggered by extreme climatic phenomena, causing a possible Natech event. Revegetation and physical stabilization measures should be implemented immediately as part of a rehabilitation plan, for the provision of regional safety. Source

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