8 research outputs found
Fractals applications on fractured archeological samples reconstruction
The civil engineering materials in the whole existing civilization have many characteristics which do not depend of past historical period, but, there is forever and everywhere fractal characteristic of structures morphology. Many archeological sources which are very rich with samples from prehistorical periods, ancient Greece, Roman and Vestian period, Slovenes and later, are existing in Balkan and South-East Europe. These sources and samples are very important for our civilization evaluation. Sometimes or even often, we fined archeological samples which are fractured and damaged. In such situation, it is very important to reconstruct some of these parts. We developed quite new method based on fractals analysis and characterization which is an excellent tool for reconstruction the archeological and heritage samples. In these paper, we successfully presented this application and opened new perspectives for research in this area
Dendroindication of drought in Rogatica region (eastern Bosnia)
The aim of this study was to investigate the possibility of using the dendrochronological method in drought prediction in eastern Bosnia. As an indicator of drought, the standardized precipitation index (SPI) was used. In the wider area of Rogatica (eastern Bosnia), 11 core samples from trees were taken. The best connection between the width of tree rings and drought was shown by the sample of a 67-year-old European silver fir (Abies alba) from the mountain Boksanica. Removal of the biological trend (standardization) was performed by the autoregressive-moving-average (ARMA) method. Calculations showed that precipitation, i.e. drought in the summer months, is crucial for radial increment of the sample. The obtained results of our research have been confirmed in examples in the region and further
Assessment of sugar beet root yield by ammi analysis
Sugar beet cultivars have different responses in various environments, such as different locations, years, mineral nutrition treatments or the combination of these factors, due to genotype x environment interaction. Additive main effect and multiplicative interaction (AMMI) is one of the most commonly used multivariate methods for analysis and visualization of genotype x environment interaction data. The main goals of the present study were to (i) investigate the application of AMMI method in the analysis of genotype x fertilizer interaction in sugar beet, (ii) to assess genotype x fertilizer interaction, and (iii) to identify sugar beet cultivars with the most stable response and high yield performance across different mineral nutrition treatments. The trial with eight sugar beet cultivars was conducted in two successive growing seasons at Rimski sancevi, Serbia. The different levels of nitrogen, phosphorous and potassium fertilizers (0, 50, 100 and 150 kg ha(-1)) and their combinations represented specific environments for testing genotype x fertilizer interaction. Results from the analysis of variance indicated that the fertilizer treatment, cultivars, and their interaction significantly affected root yield variation in both seasons. Results from our study suggest that AMMI model with two and three first IPCA axes were recommended in 2014 and 2015, respectively. According to AMMI 1 and AMMI 2 biplot, E14 and E15 were high yielding and among the most stable treatments in both years. Among high yielding genotypes in 2014, G4 and G8 stand out as the most stable, while in the following year G3 had the lowest interaction score. AMMI analysis enabled identification of specific associations between cultivars and different mineral nutrition treatments, which was important for adjustment of fertilizer management for each cultivar in order to achieve high root yield with decreased and more rational fertilizer doses
Uticaj Äubrenja azotom na sadržaj Å”eÄera i prinos korena Å”eÄerne repe
Klimatske promene i uvoÄenje novog sortimenta u proizvodnju zahtevaju usaglaÅ”avanje u koliÄini primenjenih mineralnih hraniva. U radu je ispitivan uticaj tri rastuÄe doze azotnog Äubriva na prinos i kvalitet korena Å”eÄerne repe. U 2015. godini usled suÅ”e rast doza azotnih Äubriva uslovio je smanjivanje prinosa korena i digestije u korenu Å”eÄerne repe. Kod tretmana sa 100 kgN/ha doÅ”lo je do smanjenja prinosa polarizacionog Å”eÄera, a pri dozi od 150 kg/ha doÅ”lo je do smanjenja prinosa korena. Sadržaj Å”eÄera je proporcionalno opadao sa porastom doze azotnog Äubriva
Main characteristics of water regime of the phreatic aquifer in Subotica municipality: Vojvodina, Serbia
Subotica municipality is situated in the Subotica-HorgoÅ” sands in the BaÄka loess plateau, the two geomorphological units made of the early Quaternary sediments of intergranular porosity which form the water collecting environment for the phreatic aquifer. Owing to this, the phreatic aquifer is developed within the whole study area. Because of incomplete database, primarily the lack of contemporary data of the phreatic water table depth from various measuring points, the main aims of the paper are restricted to defining basic characteristics of water regime of the phreatic aquifer in Subotica municipality and their causal connection with the dominant climatic factor. Special emphasis in the paper is given to the issue of inadeĀquate monitoring of water table depth in the study area, which is the result of insufficient coverage of the area with active monitoring wells. Actually, there are only 10 active monitoring wells in Subotica municipality, which are unevenly distributed in the study area. Such situation disables the studious approach in studying the water regime of the phreatic aquifer and estimating the exact directions of its outputs, which creates a significant problem that needs to be solved in the near future.
Dendroindication of drought in Rogatica region (Eastern Bosnia)
The aim of this study was to investigate the possibility of using the
dendrochronological method in drought prediction in eastern Bosnia. As an
indicator of drought, the standardized precipitation index (SPI) was used. In
the wider area of Rogatica (eastern Bosnia), 11 core samples from trees were
taken. The best connection between the width of tree rings and drought was
shown by the sample of a 67-year-old European silver fir (Abies alba) from
the mountain BokŔanica. Removal of the biological trend (standardization) was
performed by the autoregressive-moving-average (ARMA) method. Calculations
showed that precipitation, i.e. drought in the summer months, is crucial for
radial increment of the sample. The obtained results of our research have
been confirmed in examples in the region and further. [47007
Photonic structures improve radiative heat exchange of Rosalia alpina (Coleoptera: Cerambycidae)
The insect cuticle serves a multitude of purposes, including: mechanical and thermal protection, water-repelling, acoustic signal absorption and coloration. The influence of cuticular structures on infrared radiation exchange and thermal balance is still largely unexplored. Here we report on the micro- and nanostructured setae covering the elytra of the longicorn beetle Rosalia alpina (Linnaeus, 1758) (Coleoptera: Cerambycidae) that help the insect to survive in hot, summer environments. In the visible part of the spectrum, scale-like setae, covering the black patches of the elytra, efficiently absorb light due to the radiation trap effect. In the infrared part of the spectrum, setae of the whole elytra significantly contribute to the radiative heat exchange. From the biological point of view, insect elytra facilitate camouflage, enable rapid heating to the optimum body temperature and prevent overheating by emitting excess thermal energy