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Упит dcterms_subject_txt:Sistem AT

1112 items

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants
    ... Available online at: www.shd.org.rs/jscs/ 600 ŠTRBAC et al. Samples from the sediment top layer (0–20 cm) were collected using a plastic corer and transported to laboratory in polyethylene bags. The sediment samples were wet-sieved through a 63 μm sieve and then air dried at room temperature. ...
    ... the confluence into the Dan- ube river (c). Peak assign- ments: ββ, βα and αβ designate the configurations at C17 and C21 in the pentacyclic terpa- nes; (S) and (R) designate con- figuration at C22 in the tricyc- lic and pentacyclic terpanes; Dia – diahopane; O – olean- ane; G – gammacerane. ____ ...
    ... (S) and (R) designate con- figuration at C20 in both the steranes and diasteranes. ____________________________________________________________________________________________________________________________ (C) 2014 SCS. All rights reserved. Available online at: www.shd.org.rs/jscs/ ORGANIC MATTER ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina

    Tina Dašić, Ljiljana Vasić (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry,Global and Planetary Change

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... r flow, as well as the goal of the task at hand, were of primary importance in selecting the mathematical model concept. A multi-layered model was developed. The hydrodynamic model represented the municipal groundwater source of Kikinda (the source at Šumice and the Jezero Well), but also the ...
    ... depth of the pumped aquifer at the source and the thick package of semi-permeable and impermeable sediments in its overlying bed, the surface streams have no affect on the groundwater regime of the tapped horizon. This boundary condition was specified in the first layer at locations where both canals ...
    ... condition. For the purposes of the hydrodynamic model, well discharges at Šumice were registered every seven days during the period from January 1 to December 31 (Table 2). Figure 7 shows individual well discharges recorded at Šumice during the one-year period. Figure 7. Registered individual ...

  • Energetska bezbednost sektora prirodnog gasa Srbije

    Aleksandar Madžarević, Predrag Jovančić, Miroslav Crnogorac (2023)
    U prve dve decenije 21. veka obezbeđivanje sigurnosti snabdevanja prirodnim gasom domaćeg tržišta bio je jedan od prioriteta razvoja energetike Srbije. Istovremeno, aspekt sigurnog snabdevanja bio je neizostavni deo slagalice stvaranja energetske bezbednosti. Izražena uvozna zavisnost je dominantna karakteristika sektora prirodnog gasa, tačnije, Republika Srbija je snažno zavisna od ruskog gasa, sa više od 80% uvezenih količina gasa, a do pre dve godine snabdevala se isključivo kroz jednu interkonekciju. U radu se razmatra aktuelna situacija u sektoru prirodnog ...
    N-1, IDUPS, energetska bezbednost, sigurnost snabdevanja
    ... raspoloživost sistema u tehničkom smislu, diversifikaciju izvora i pravaca snabdevanja, kao i stepen strukturnog razvoja u poređenju sa predviđenim strateškim planovima razvoja, respektivno. U ovom radu je predstavljena i nova metodologija za ut- vrđivanje uticaja spremnosti sistema i broja izvora ...
    ... as an assistant professor at FMG, UB. Aleksandar is married and the father of three children. Predrag Jovančić is a full professor at the Faculty of Mining and Geology, University of Belgrade. Graduated, master's and doctorate in the field of Mechanization in mining, at the FMG, UB, where he was ...
    ... (max. 70 words about each enrolled at the Faculty of Mechanical Engineering, UB. He completed his author) undergraduate and graduate academic studies in the module Process Engineering and Environmental Protection in 2011. He finished his doctoral studies at the Faculty of Mining and Geology, UB ...

  • Geomechnical research for the new bucket wheel excavator testing at Open pit “Filijala”

    Vladimir Čebašek, Nebojša Gojković, Veljko Rupar, Miodrag Pribićević (2020)
    Since 1976 cement marl excavation at open-pit mine „Filijala” is carried out by continuous exploitation technology using bucket wheel excavator SH 400 manufactured by Orenstein und Koppel (O & K) company. Due to the bucket wheel excavator time-worn and high operating cost it was necessary to replace it with new one. In order to test the new bucket wheel excavator and prove its capacity a testing zone was defined as test block for excavation, in which the bucket wheel ...
    отпор на копање, лапорац, роторни багер

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological da- ta and the characteristics of the fossil material support the proposed model in which the sedi- ment was at least partially transported by hyperpycnal currents. Furthermore, based ...
    ... should be a recon- struction of the hinterland area of the system which is also lacking at present. Although the framework of the Devonian/Carbonifer- ous flysch systems of SE Europe was developed and compared at regional scales (EBNER et al., 2008; VOZÁROVÁ et al., 2009), local studies in the Car ...
    ... transport of the sediment. The siliciclastic succession at Kostadinovica shows sedimen- tary and palaeontological characteristics which could be com- pared to the model of extrabasinal turbidites (ZAVALA & AR- CURI, 2016). The observed rocks at the Kostadinovica site were grouped into different facies ...

  • Simulation of Hydrogeological Environmental Discharge in Case of Interruption Constant Observations

    Marina Čokorilo Ilić, Dragoljub Bajić, Miroslav Popović (2024)
    Monitoring Network, data, hydrogeological environment, tunnel, simulation

  • Linear-motor plunger pump increases lifting efficiency

    Bojan Martinović, Dušan Đekić, Dušan Danilović, Pavel Isaev (2022)
    plunger, linear, motor, pumps

  • Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm

    Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić (2021)
    Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems that may arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while ...
    Energija,energetski inženjering i elektroenergetska tehnologija,obnovljivi izvori energije, održivost i životna sredina,električni i elektronski inženjering,kontrola i optimizacija,inženjering
    ... were analyzed for the mathematical model, i.e., the types of wind turbine that had the largest dimensions at that time—with the height of the turbine center at 149 m and the rotor diameter at 162 m (Vestas V 162/5,6 MW); 3. The permissible noise levels of wind turbines recommended by the World Bank ...
    ... n for the wind turbines at the very beginning of a project’s development. This means that there is no need to wait for the production of an EIA at the level of project documentation, because it brings certain risks for investors and for the project itself, given that at that stage the development ...
    ... planned Maestrale Ring wind farm (case study) is located in the north of the Republic of Serbia, at a distance of about 25 km from the border with Hungary. The central part of the location is situated at 45°56′02.51″ N i 19°41′07.29″ E (more detailed coordinates in the Gauss-Kruger coordinate system ...

  • Threshold-induced correlations in the Random Field Ising Model

    Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević (2018)
    Multidisciplinary
    ... of the e�ective �eld hi eff at its site; otherwise, Si becomes unstable, and �ips at the next moment t + 1 of discrete time. �us, the �ipping of each spin in�uences the e�ective �eld for all of its nearest neighbors. All those neighbors that become unstable will �ip at the next moment of time, which ...
    ... of the effective field net at its site; otherwise, S; becomes unstable, and flips at the next moment t+ 1 of discrete time. Thus, the flipping of each spin influences the effective field for all of its nearest neighbors. All those neighbors that become unstable will flip at the next moment of time, which ...
    ... around the coercive value (i.e. the value at which the system magnetization = ∑ =M Si N i1 is zero). One fragment of such signal is shown in the bottom panel of Fig. 1a. �e num- ber of spins �ipped at a given moment of time t is taken as the signal value V(t) at that moment, and the time is measured ...

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... appending zones of their increased temporal probability for a given return period, and finally, estimating which elements at risk these exceeded probabilities can affect and at what level. In this work, a practical case is represented to illustrate all these steps and demonstrate successful impl ...
    ... landslides both spatially and temporally (temporal dimension through the designated rainfall period, i.e. annual). ● Element at risk inventorying: housing sector as element at risk, mapped on the basis of building structure and average population density per unit; building structure polygon database; ...
    ... Resulting exposure vulnerability map (Fig. 7) was superimposed to the inventory of elements at risk, to obtain the final relative risk (Fig. 8). Only the housing sector land use types entered the inventory of elements at risk, since only these had precise population estimates per block. The final map was ...

  • Bilingual lexical extraction based on word alignment for improving corpus search

    Jelena Andonovski, Branislava Šandrih, Olivera Kitanović (2019)
    Library and Information Sciences,Computer Science Applications

  • GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities

    Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević (2021)
    GNSS, Time series, Seismic deformations, Earthquake, Infrastructure utilities

  • Primena AT viseće podgrade u rudnicima Srbije

    Vladimir Milisavljević (2015)

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)

  • A hundred years of Milutin Milanković's climate change theory - geological implications

    Dejan Radivojević (2020)
    Миланковићева теорија циклуса објављена пре сто година је најважнија теорија у наукама које проучавају климу и имала је велики утицај на дисциплине које се баве Земљом. Ипак, његов рад је чекао више од педесет година да би добио потврду. Може се рећи да Миланковићев рад највећи утицај на геологију има у изради астрономске временске скале, подршци хипотези континенталног дрифта и палеоклиматологији. Добри резултати примене астрономске временске скале на неогене седименте иницирали су примену ове методе у мезозојским и у последње ...
    циклостратиграфија, астономска временска скала, геолошка временска скала, климатске промене, континентални дрифт
    ... pri- vate teachers and governess. Since there was not electrotechnics at vienna Technological Institute (actually Technische Universität Wien) he went to civil engineering and graduated in 1902. He contin- ued his vienna studies and at age of 25 (on Decem- ber 12th, 1904) gained a PhD and become the first ...
    ... honeymoon in his hometown and he was imprisoned in a war camp at Neusiedl am See (Nežider), Austria. His wife Hristi - na travelled to vienna and intervened with his pro- fessor Emanuel Czuber to help Milutin’s desperate situation. After six months at the prisoner-of-war camp he was transferred to Budapest ...
    ... periods (including the formation of additional ice sheets besides the two at the poles) and interglacial episodes (exclusive of additional ice sheets). During the icehouse period, the concentrations of the greenhouse gases in at- mosphere are relatively low and temperature shows a global decline. Decreased ...

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... Location names are bold italic, and sample names in regular text. The at.% As was calculated from XRPD data according to [14]. Impurities were determined as an averagjee of 15 SEM-EDS analyses. Location/ k i k o i3 at.% As Impurities [at.%] Sample a[A] biA] c[A] |: 0| VIA*] duui (XRPD) (SEM-EDS) Rudnik ...
    ... interfere with other reflections, has sufficient intensity, and can be precisely measured as it occurs at a relatively high 20. Based on 14 reliable XRPD measurements, the at.% As was calculated as at.% As = 866.67 dia1i— 1381.12 [14]. The XRPD study of arsenopyrite from four samples from Drenjak shows ...
    ... close to its theoretical value of 33.3 at.% [14] (Figure 1c). Arsenopyrite from other investigated localities are close to the theoretical value, but they show compositional zonation and contain considerable amounts of trace elements (e.g.., Co, Ni, Sb at Sastavci, Figure 1d) or are characterised ...

  • Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions

    Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)
    A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...
    Ceria, Yttrium, Solid solution, Mechanosynthesis, Oxygen vacancy, Nanocrystalline material

  • Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu (2020)
    Geochemistry and Petrology