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Search Results: 1 - 10 of 1593 matches for " Lukovi? Jelena "
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Comparative analyses of ground based and satellite temperature measurements on the territory of Serbia
Glasnik Srpskog Geografskog Dru?tva , 2008, DOI: 10.2298/gsgd0801080l
Abstract: In this paper the air temperature changes on the territory of Serbia were investigated, on the basis of data from ground-based and satellite measurements, for the period 1979-2006. The trend analysis has shown that there is no amplification of trend of air temperature increase with altitude. The conclusion imposes itself that the air temperature increase in the researched area as well as on the Earth can not be only explained by models which presume domination of anthropogenic greenhouse effect.
Possible causes of contemporary Nisava River discharge variability
Duci? Vladan,LukoviJelena
Glasnik Srpskog Geografskog Dru?tva , 2009, DOI: 10.2298/gsgd0904255d
Abstract: Nisava River is the largest tributary of the South Morava River of length 248 km, of which 151 km is in Serbia. Annually to all three hydrological profiles (Pirot, Bela Palanka and Nis) in the reporting period (1961-2000) has been observed decrease in discharge. That would be in accordance with the IPCC's claims about the domination of the influence of anthropogenic greenhouse gases on the reduction of rainfall and discharge in Serbia. However, the area of the Nisava basin in the second half of the XX century has shown decrease in air temperature. The station Dimitrovgrad, in the upper part of the basin, from 1949 to 2007 showed trend of annual temperature of -0.0049oC per year, which does not fit to the concept of dominance of anthropogenic greenhouse gases. And the trend of rainfall in this period, changes sign from negative to positive (0.1175mm per year), so that it does not fit the concept of domination of the global anthropogenic impact on regional models of IPCC. Regarding to this and projections of possible climate change in the future all potential climatic factors should be taking into account.
Temperature changes in Serbia and worldwide according to satellite data
LukoviJelena,Manojlovi? Predrag,Mustafi? Sanja
Glasnik Srpskog Geografskog Dru?tva , 2009, DOI: 10.2298/gsgd0903177l
Abstract: In this paper the air temperature changes have been investigated on the base of satellite measurement, in the period from 1979 until 2006. The analysis has shown that there is no temperature amplification with altitude. Data for Serbia have shown negative trend of temperature in the last 20 years of the investigated period. Although it is not statistically significant, the sign is not in accordance with the increasing CO2 concentration. This may mean that the sign of satellite temperature doesn't support hypothesis about domination of anthropogenic greenhouse effects. .
Possible connection between Danube river discharge variability and solar activity
Duci? Vladan,LukoviJelena,Nikolova Nina
Glasnik Srpskog Geografskog Dru?tva , 2007, DOI: 10.2298/gsgd0701031d
Abstract: Relations between discharge changes and solar activity are very complex and this is the reason why the obtained results are often contradictory. In this paper we tray to explore possible relation between Danube river discharge elements and parameters of solar activity. The best result has been found between flow index and latitude of sunspots. According to literature we propose possible mechanism of solar activity influence on the discharge.
Atmospheric circulation and the precipitation variability in Serbia for period 1949-2004
Duci? Vladan,LukoviJelena,Stanojevi? Gorica
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1002085d
Abstract: In this paper we have analyzed the correlation between the atmospheric circulation and annual precipitation in Serbia for period 1949-2004. The data for frequency Hess-Brezowsky circulation forms and types were used as indicators of atmospheric circulation. Statistically significant coefficient of a negative sign is obtained for zonal and half-meridional form and a positive sign for meridional form. The strength of correlation is not uniform in the space. According to the multiple linear regression the contribution of atmospheric circulation in the variability annual precipitation of Serbia is 69%. Also, we analyzed the connection between the atmospheric circulation and the mean annual cloudiness. Comparing the results for this two climate elements we have concluded that they show different time-space development for same macrosynoptic conditions. Also, we can speak about the regional aspects of these processes. .
Spatial distribution of interpolation uncertainity: Case study of isotherm map of Serbia (1991-2009)
Pejovi? Milutin,Bajat Branislav,LukoviJelena
Glasnik Srpskog Geografskog Dru?tva , 2012, DOI: 10.2298/gsgd1204031p
Abstract: More widely used geostatistical methods for modeling distributed phenomena requires the evaluation of the quality of the product (maps) obtained by their application. The method of evaluation of uncertainty i.e. quality of the map was described on the example of a map of mean annual air temperature in Serbia for the period from the years 1991 to 2009 that was obtained from a relatively small number of samples for the whole country area (110 meteorological stations). The uncertainty of the map, obtained by kriging interpolation was evaluated by applying a Monte Carlo simulation modeling method. [Projekat Ministarstva nauke Republike Srbije, br. III47014, br. III43007 i br. TR 36009]
Temperature changes on the Earth and in Serbia and North Atlantic oscillation (NAO)
LukoviJelena,Manojlovi? Predrag,Mustafi? Sanja
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1001123l
Abstract: In this paper connection between temperature changes and North Atlantic oscillation (NAO) has been investigated in the period from 1979 until 2006. Satellite temperature data from UAHMSU were investigated in relation to North Atlantic Oscillation index on the Earth, in Europe and in Serbia. Statistically insignificant correlation coefficient has been obtained for the area of Serbia. The analysis of periodicity of 2.8±0.5 year is in accordance with that one obtained by Landschieidt (2001). However, in order to give final conclusion regarding to climate change more parameters should be analyzed. .
Synthesis and characterization of (Ba,Yb) doped ceria nanopowders
Branko Matovi?,Jelena Panti?,Jelena Lukovi,Svetlana Ili?
Processing and Application of Ceramics , 2011,
Abstract: Nanometric size (Ba, Yb) doped ceria powders with fluorite-type structure were obtained by applying selfpropagating room temperature methods. Tailored composition was: Ce0.95 xBa0.05YbxO2 δ with fixed amount of Ba 0.05 and varying Yb content “x” from 0.05 to 0.2. Powder properties such as crystallite and particle size and lattice parameters have been studied. R ntgen diffraction analyses (XRD) were used to characterize the samples at room temperature. Also, high temperature treatment (up to 1550°C) was used to follow stability of solid solutions. The mean diameters of the nanocrystals are determined from the full width at half maxima (FWHM) of the XRD peaks. It was found that average diameter of crystallites is less than 3 nm. WilliamsonHall plots were used to separate the effect of the size and strain in the nanocrystals.
Characterization of bentonite clay from “Greda” deposit
Nade?da Stankovi?,Mihovil Logar,Jelena Lukovi,Jelena Panti?
Processing and Application of Ceramics , 2011,
Abstract: Based on mineralogical and technological investigations of the deposit “Greda” important characteristics of bentonite clay were determined. Representative samples of the deposit were characterized with X-ray diffraction, low-temperature nitrogen adsorption, chemical analysis, differential thermal analysis and scanning electron microscopy. It was determined that the main mineral is montmorillonite and in subordinate quantities kaolinite, quartz and pyrite. The chemical composition generally shows high silica and alumina contents in all samples and small quantities of Fe3+, Ca2+ and Mg2+ cations. Based on technological and mineralogical research, bentonite from this deposit is a high-quality raw material for use in the ceramic industry.
Seasonal variability of Crvena river water mineralization
Manojlovi? Predrag,Nikoli? Milena,Mustafi? Sanja,LukoviJelena
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1004009m
Abstract: The mineralization of water and its content in Crvena River so far have not been studied. Water sampling was conducted from April 2008 - May 2009. Total mineralization is relatively low, which is consistent with the dominant lithological structure (Permian red sandstone). Dry residue contains Ca2+ ion, with the increased participation of SiO2. During the observational period it is clearly expressed seasonal effect. It is reflected not in the direct but the indirect impact. Based on the ratio of individual ions a model is determined for estimation of water flow at the confluence of the Crvena River in Nisava River. It could be applied to other drainage basins that have not been studied so far.
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