Collective Dynamics and Strong Pinning near the Onset of Charge Order in La1.48_{1.48}Nd0.4_{0.4}Sr0.12_{0.12}CuO4_{4}

The dynamics of charge-ordered states is one of the key issues in underdoped cuprate high-temperature superconductors, but static short-range charge-order (CO) domains have been detected in almost all cuprates. We probe the dynamics across the CO (and structural) transition in La$_{1.48}$Nd$_{0.4}$Sr$_{0.12}$CuO$_{4}$ by measuring nonequilibrium charge transport, or resistance $R$ as the system responds to a change in temperature and to an applied magnetic field. We find evidence for metastable states, collective behavior, and criticality. The collective dynamics in the critical regime indicates strong pinning by disorder. Surprisingly, nonequilibrium effects, such as avalanches in $R$, are revealed only when the critical region is approached from the charge-ordered phase. Our results on La$_{1.48}$Nd$_{0.4}$Sr$_{0.12}$CuO$_{4}$ provide the long-sought evidence for the fluctuating order across the CO transition, and also set important constraints on theories of dynamic stripes.Comment: final version: 5 pages, 3 figures; includes Supplemental Material (3 pages, 7 figures

Mesoscopic Behavior Near a Two-Dimensional Metal-Insulator Transition

We study conductance fluctuations in a two-dimensional electron gas as a function of chemical potential (or gate voltage) from the strongly insulating to the metallic regime. Power spectra of the fluctuations decay with two distinct exponents (1/v_l and 1/v_h). For conductivity $\sigma\sim 0.1 e^{2}/h$, we find a third exponent (1/v_i) in the shortest samples, and non-monotonic dependence of v_i and v_l on \sigma. We study the dependence of v_i, v_l, v_h, and the variances of corresponding fluctuations on \sigma, sample size, and temperature. The anomalies near $\sigma\simeq 0.1 e^{2}/h$ indicate that the dielectric response and screening length are critically behaved, i.e. that Coulomb correlations dominate the physics.Comment: Revised according to referee remark

CHEMICAL EVALUATION OF AUTOCHTHONOUS VARIETY 'PROKUPAC' RED WINE WITH THE ADDITION OF SELECTED AROMATIC HERBS

The quality parameters and chemical composition (total phenolics, total flavonoids and total anthocyanins) of the red wine obtained from the autochthonous variety 'Prokupac' (Vitis vinifera L.) with the addition of the selected aromatic herbs (Pimpinella anisum L., Cinnamomum zeylanicum, Artemisia absinthium and Glycyrrhiza glabra) were examined in two consequtive vintages (2013-2014). The differences in contents of total extract, reducing sugars and ash between the studied samples were observed, but with no statistical significance between both examined years and analyzed wines. 'Prokupac' red wines with the addition of aromatic herbs stood out with significantly higher contents of total phenolics (371.4-594.3 mg GAE L-1) and total flavonoids (136.2-243.2 mg CTE L-1) while lower total anthocyanins content was noticed, when compared to 'Prokupac' red wine used as control (p<0.05). The unfavourable weather conditions in the vintages 2013 and 2014, reflected notably on the quality of the obtained wine. To analyze the correlations between wine quality parameters and the similarity of individual wine samples, Principal Component Analysis (PCA) was used

Recultivation of degraded soil due to mining activity without adding organic layers of soil using alfalfa and mixtures of grass legumes

The aim of this research was to examine the possibility of reparing the chemical properties of substrate and regenerating the vegetation of degraded soil due to mining activity without adding the fertile soil layer. The research was carried out in the period 2011-2013 on degraded soil of mine and thermal power plant Gacko. The experiment was placed on a landfill located in Srđevići. For these tests, grass-leguminous mixtures were used: I/G (alfalfa 70%, orchard grass 30%); II/G (alfalfa 70%, orchard grass 15%, tall oat-grass 15%); III/G (red clover 50%, italian rye-grass 50%); IV/G (alfalfa 30%, tall fescue 40%, smooth brome15%; orchard grass 15%) and alfalfa 100%. The following parameters were monitored and analyzed during the tests: mechanical soil composition, soil chemical properties, microelement content in the soil: Zn, Mn, Fe, Cu; the content of heavy metals in the soil: Pb, Ni, Cr, Cd, Hg, As, plant species presence in the mixture, soil cover with grass, yield of green mass by cuts and years, content of microelements and heavy metals in dry vegetable mass by cuts and influence of nitrate content of individual microelements and heavy metals in soil and dry mass of plants. Studies of the content of microelements and heavy metals in degraded soil showed that it contained Cd in significantly higher value than the permitted limit value. Other elements were within the limit values permitted for agricultural land. The content of Cd in 2011 was 5.1 mg kg-1 of soil, and in 2013 it was 4.5 mg kg-1 of soil. By analyzing the composition of the green matter in mixtures I/G, II/G and IV/G, it was found that orchard grass was predominantly present in relation to other constituents of the mixture. The III/G mixture was dominated by Italian rye-grass. The participation of other plant species in the mixture was extremely low. In the green mass of all mixtures, leguminous was represented in a small percentage. The largest soil cover with plants was achieved with the mixture IV/G (88.4%), which at the same time achieved the highest average yield of green mass. The determined values of the content of microelements and heavy metals in the dry mass were within the allowed limits. Nitrates influenced the reduction of Cu and Cr content in soil and Cd content in dry plant mass

Influence of vine loads with fertile buds on grape yield and quality of variety ŽiŽak in podgorica vineyard area

Results of a two-year study of the influence of different vine loads with fertile buds on elements of grape yield and quality of Žižak grape variety are presented in this paper. The research was conducted in the Podgorica sub region, at the Lješkopolje site. Four different vine loads with fertile buds were applied: 14 buds, 18 buds, 20 and 24 buds per vine. The results of this research show that the applied loads significantly influence the examined parameters of the autochthonous variety Žižak. The highest percentage of developed and fertile shoots, as well as the average number of flowers per bud, had a variant with load of 14 buds. The relative coefficient of yielding in all examined load variants had mean values. In terms of the number of flowers per fertile shoot in the two-year average, variants with a load of 18 and 14 buds (1.44 and 1.39) stood out. The highest yield of grapes in the two-year average had the variant with a load of 24 buds-3.60 kg/vine, while the highest bunch weight had the variant V1-185 g. The quality of grapes also varied significantly under the influence of the vine load with fertile buds. The highest sugar content in must had variant with a load of 18 buds (22.32%), while the highest acid content (6.27g/l) was recorded in the variant with 24 buds per vine

Detailed Analysis of Balmer Lines in a Sloan Digital Sky Survey Sample of 90 Broad Line Active Galactic Nuclei

In order to contribute to the general effort aiming at the improvement of our knowledge about the physical conditions within the Broad Line Region (BLR) of Active Galactic Nuclei (AGN), here we present the results achieved by our analysis of the spectral properties of a sample of 90 broad line emitting sources, collected at the Sloan Digital Sky Survey (SDSS) database. By focusing our attention mainly onto the Balmer series of hydrogen emission lines, which is the dominant feature in the optical wavelength range of many BLR spectra, we extracted several flux and profile measurements, which we related to other source properties, such as optical continuum luminosities, inferred black hole masses, and accretion rates. Using the Boltzmann Plot method to investigate the Balmer line flux ratios as a function of the line profiles, we found that broader line emitting AGN typically have larger H_alpha / H_beta and smaller H_gamma / H_beta and H_delta / H_beta line ratios. With the help of some recent investigations, we model the structure of the BLR and we study the influence of the accretion process on the properties of the BLR plasma.Comment: 14 pages, 11 figures, fixes the wrong names of 4 objects; published on Ap