University of the Aegean

About: University of the Aegean is a education organization based out in Mytilene, Greece. It is known for research contribution in the topics: Population & Context (language use). The organization has 2818 authors who have published 8100 publications receiving 179275 citations. The organization is also known as: UAEG.

A binarization algorithm specialized on document images and photos

Abstract: In this paper, a new method for document images or photos binarization is presented. The method is simple, fast and robust and appropriate for normal as well as for special cases of documents like photos, historical documents etc. The proposed method is applied to problematic cases of documents and it is compared to other traditional methods.

Groundwater quality, nitrate pollution and irrigation environmental management in the Neogene sediments of an agricultural region in central Thessaly (Greece)

Abstract: The degradation of groundwater quality, which has been noted in the recent years, is closely connected to the intensification of agriculture, the unreasonable use of chemical fertilizers and the excess consumption of large volumes of irrigation water. In the hilly region of central Thessaly in Greece, which suffers the consequences of intense agricultural use, a hydrogeological study is carried out, taking groundwater samples from springs and bore- holes in the Neogene aquifers. The aim of this study is the investigation of irrigation management, water quality and suitability for various uses (water supply, irrigation), the degradation degree and the spatial distribution of pollutants using GIS. The following hydrochemical types prevail in the groundwater of the study area: Ca-Mg-HCO3, Mg-Ca- Na-HCO3 and Na-HCO3. In the above shallow aquifers, especially high values of NO3 - (31.7-299.0), NH4 ? (0.12-1.11), NO2 - (0.018-0.109), PO4 3- (0.07-0.55), SO4 2- (47.5-146.5) and Cl - (24.8-146.5) are found, par- ticularly near inhabited areas (values are in mg L -1 ). The water of shallow aquifers is considered unsuitable for human use due to their high polluting load, while the water of the deeper aquifers is suitable for human consumption.

A methodology to estimate odors around landfill sites: the use of methane as an odor index and its utility in landfill siting.

Abstract: The estimation of odor production and dispersion from landfill sites is a very complicated task because of the different chemical species that exist in biogas. To site a new landfill, it is necessary to know the distance that odors can travel around the landfill under atmospheric conditions that increase the concentration of pollutants. Although CH4 is an odorless gas, it can be used as an index to determine the dispersion of low-reactivity odorous species around a landfill site. Methane production rates, estimated by biogas production models, were used by an air dispersion model to determine the spatial distribution of CH4 around landfill sites. By utilizing dispersion models under extreme atmospheric conditions, a maximum CH4 concentration around the landfills was determined. Based on the ratio between CH4 and odorous chemical species, the spatial distribution of the concentration of an odorous species was determined for those species with low reactivity in the atmosphere. For odorous species w...

Measurement of D*± production in deep inelastic scattering at HERA

Abstract: The production of D * ± mesons in deep inelastic ep scattering has been measured for exchanged photon virtualities 5 2 2 , using an integrated luminosity of 363 pb -1 with the ZEUS detector at HERA. Differential cross sections have been measured and compared to next-to-leading-order QCD calculations. The cross-sections are used to extract the charm contribution to the proton structure functions, expressed in terms of the reduced charm cross section, σ red cc . Theoretical calculations based on fits to inclusive HERA data are compared to the results. © 2013 SISSA.