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568 items
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Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability
Marija Živković, Dejan Ivezić (2021)Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија... correlation between COP and temperature deference (t lift ) between treated wastewater and supply water in DH. Higher-temperature difference corresponds to lower values of COP. The heating regime in Serbian district heating systems is 90/70C, so temperature at the exit of the heat pump should ...
... treated water and river Sava (recipient) are presented in Table 3. Even in the winter period, the temperature of treated water is higher than 11 °C, so it is adopted to be a minimal available temperature of the heat source. For calculations, the flow rate of 286 l/s of discharged water is adopted ...
... lignite-fuelled thermal power plants (Statistical Office of Table 3 Temperature of treated water and river Sava (recipient), (°C) Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Treated water 11.1 11.3 14.1 15.9 18.8 22.2 23.8 24.2 21.8 19.7 15.8 12.2 Sava 3.1 3.9 6.9 11.2 15.8 19.8 22 ...Marija Živković, Dejan Ivezić. "Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability" in Clean Technologies and Environmental Policy, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10098-021-02063-6
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Hydrodynamic analysis of radial collector well ageing at Belgrade well field
The origin and effect of hydraulic resistances on the rate of ageing of radial collector wells are identified through numerical hydrodynamic analysis. The research includes hydrodynamic modeling of one such well with new laterals at Belgrade well field. The performance of the laterals is aggravated by rapid ageing. The change in the hydraulic parameters of the laterals during the first decade of operation is analyzed through simulations of the groundwater regime with realistically specified geometries and hydraulics of the ...Đorđije Božović, Dušan Polomčić, Dragoljub Bajić, Jelena Ratković. "Hydrodynamic analysis of radial collector well ageing at Belgrade well field" in Journal of Hydrology, Elsevier BV (2019). https://doi.org/10.1016/j.jhydrol.2019.124463
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Characterization of biochar surface functional groups
In this work, biochar originating from paper fibres was examined. Biochar was prepared via pyrolysis method at 550°C. Oxygen-containing functional groups on biochar surface were determined. The surface functional groups of biochar were analysed by Fourier transform infrared spectroscopy. The amount of oxygen-containing functional groups was performed with Boehm titration. The total acidity of biochar was mostly attributed to carboxylic and lactonic groups.Marija Ilić, Vesna Pavelkić, Aleksandar Lolić, Branko Leković. "Characterization of biochar surface functional groups" in Šesti Naučno-stručni skup Politehnika, Beograd, 10. decembar 2021., Beograd : Akademija tehničkih strukovnih studija (2021)
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Stability analysis on slope PK dacite Ceramide
Safe surface mining exploitation of minerals is possibile only if stable bench and overall slopes in the open pit are construct. In order to to construct stable open pit slopes, it is necessary to carry out certain physical and mechanical laboratry testing of mineral raw materials in order to determine the geomechnical calculating parameters. These calculating parameters represent the base ground for performing slopes analyses and the open pit design. In this paper, an stability analysis of benches and ...Vladimir Čebašek, Veljko Rupar, Vladimir Ivoš, Vladimir Petković. "Stability analysis on slope PK dacite Ceramide" in VIII International geomechanics conference, Scientific And Technical Union of Mining, Geology and Metallurgy (2018)
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To what extent reactivated faults are (not) responsible for karst process: example from Serbian Carpatho-Balkanides?
Ana Mladenović, Jelena Ćalić (2023)Carpatho-Balkanides represent part of the complex Dinaric – Carpatho – Balkan orogenic system, that geomorphologically dominates the central part of the Balkan Peninsula. The existence of this orogenic system is a result of closure of the Neotethys ocean and subsequent convergence of the Adriatic microplate and the Eurasian continent, that has been still active in the recent times. Such geodynamic characteristics conditioned complex tectonic structures, multiply reactivated during Late Cretaceous and Cenozoic times. The main aim of this work ...Ana Mladenović, Jelena Ćalić. "To what extent reactivated faults are (not) responsible for karst process: example from Serbian Carpatho-Balkanides?" in Abstracts and Guide Book 30th International Karstological School "Classical Karst" Karst - Approaches and Conceptual Models, Ljubljana : Scientific Research Centre of the Slovenian Academy of Sciences and Arts (ZRC SAZU), Karst Research Institute (2023)
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Assessments of effects of implementation of strategic plans for development of Belgrade District heating system
The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić. "Assessments of effects of implementation of strategic plans for development of Belgrade District heating system" in Sustainable Cities and Society, Elsevier BV (2020). https://doi.org/10.1016/j.scs.2020.102304
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Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems
Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević. "Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems" in Physical Review E, American Physical Society (APS) (2019). https://doi.org/10.1103/PhysRevE.100.032113
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Проширивање мреже пловних путева Републике Србије у функцији одбране земље
Мрежу пловних путева Републике Србије чини мрежа међународних и међудржавних пловних путева. Међународне пловне путеве чине реке Дунав, Сава, Колубара, Дрина, Канал Дунав-Тиса-Дунав (Д-Т-Д) „Нови Сад – Савино село“ и Беочински рукавац – канал, док међудржавни пловни пут на коме важи међународни режим пловидбе чини река Тиса. Поред наведених пловних путева који већим делом обухватају територију Аутономне покрајине Војводине, Република Србија има потенцијал проширења мреже пловних путева и у централном делу Србије пре свега у Поморављу. Проширењем мреже пловних ...Милан Кресојевић, Весна Ристић Вакањац, Драган Трифковић. "Проширивање мреже пловних путева Републике Србије у функцији одбране земље" in 50. симпозијум о операционим истраживањима - SYM-OP-IS 2023, Тара, 18–21. септембар 2023., Београд : Медија центар „Одбрана” (2023)
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Numerical simulation of the Late Jurassic closure of the Vardar Tethys
... follow a three-phase evolution of velocity boundary conditions consisting of two convergent phases separated bya single divergent phase where spreading regime is dominant. Effect of duration and magnitude ofthe second phase on model evolution is also explored. Our so far obtained simulations were able to ...Nikola Stanković, Vesna Cvetkov, Vladica Cvetković. "Numerical simulation of the Late Jurassic closure of the Vardar Tethys" in EGU General Assembly 2021, Copernicus GmbH (2021). https://doi.org/10.5194/egusphere-egu21-9893
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2D Numerical Simulation of Intraoceanic Subduction during the Upper Jurassic Closure of the Vardar Tethys
... follow a three-phase evolution of velocity boundary conditions consisting of two convergent phases separated bya single divergent phase where spreading regime is dominant. Effect of duration and magnitude ofthe second phase on model evolution is also explored. Our so far obtained simulations were able to ...Nikola Stanković, Vesna Cvetkov, Vladica Cvetković. "2D Numerical Simulation of Intraoceanic Subduction during the Upper Jurassic Closure of the Vardar Tethys" in EGU General Assembly 2020, Copernicus GmbH (2020). https://doi.org/10.5194/egusphere-egu2020-5919
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Nonequilibrium athermal random-field Ising model on hexagonal lattices
Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević. "Nonequilibrium athermal random-field Ising model on hexagonal lattices" in Physical Review E, American Physical Society (APS) (2021). https://doi.org/10.1103/PhysRevE.103.032147
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Effects of external noise on threshold-induced correlations in ferromagnetic systems
Dragutin Jovković, Sanja Janićević, Svetislav Mijatović, Lasse Laurson, Đorđe Spasojević. "Effects of external noise on threshold-induced correlations in ferromagnetic systems" in Physical Review E, American Physical Society (APS) (2021). https://doi.org/10.1103/PhysRevE.103.062114
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Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance
Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography... age, microfacies analysis of both radiolarites and limestones provides information about their depositional setting (e.g., relative water depth, transport regime, environment — e.g., bioturbating biota, oxygen con- tent) and diagenetic overprint. Whereas microfacies analysis of limestones is ...
... subsided continental margins, where these Late Anisian to early Late Ladinian radiolarites were widespread and also formed in relatively shallow water depths (Gawlick et al. 2012a; Gawlick & Missoni 2015). Therefore, Late Anisian to early Late Ladinian radiolarites either derive from the distal ...
... al. 2014; Gawlick & Missoni 2015). The absence ofribbon radio- larites on the continental margin is due to the fact that supply from shallow-water carbonate ramps and platforms led to the accumulation of a thick pile of carbonate mud on the distal shelf and partly even in the proximal oceanic ...Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović. "Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance" in Geologica Carpathica (2017)
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An oilfield in Libya: A new model to enhance waste water disposal
Dušan Danilović, Vesna Karović Maričić, Nori Elhaddad, Branko Leković. "An oilfield in Libya: A new model to enhance waste water disposal" in Energy & Environment (2016)
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Arsenic in Tap Water of Serbia´s South Pannonian Basin and Arsenic Risk Assessment
Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)... different structural porosities and clay interbeds that pre- vent pollutants from permeating from the ground surface. It should be noted, however, that water supply systems are comprised of relatively deep (70-250 m) drilled wells which tap Pliocene-Pleistocene sediments, while no elevat- ed arsenic ...
... mg/L. The pub- lic water supply is generally provided by tapping aquifers up Arsenic in Tap Water of Serbia’s... 1787 Fig. 3. Histogram of arsenic in groundwater used for drinking water supply in Banat. Fig. 4. Histogram of arsenic concentrations in groundwater used for drinking water supply in Bačka ...
... minimum As water gave HQ and R values of 0.14 and 0.6 per 1,000 persons, and the maximum As water resulted in HQ and R of 8.8 and 3.9 per 1,000 persons [41]. Conclusions Most of the groundwaters used for drinking water sup- ply in the South Pannonian Basin exhibited an unsatisfac- tory water quality, ...Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić. "Arsenic in Tap Water of Serbia´s South Pannonian Basin and Arsenic Risk Assessment" in Polish Journal of Environmental Studies (2012)
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Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment
Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)... different structural porosities and clay interbeds that pre- vent pollutants from permeating from the ground surface. It should be noted, however, that water supply systems are comprised of relatively deep (70-250 m) drilled wells which tap Pliocene-Pleistocene sediments, while no elevat- ed arsenic ...
... mg/L. The pub- lic water supply is generally provided by tapping aquifers up Arsenic in Tap Water of Serbia’s... 1787 Fig. 3. Histogram of arsenic in groundwater used for drinking water supply in Banat. Fig. 4. Histogram of arsenic concentrations in groundwater used for drinking water supply in Bačka ...
... minimum As water gave HQ and R values of 0.14 and 0.6 per 1,000 persons, and the maximum As water resulted in HQ and R of 8.8 and 3.9 per 1,000 persons [41]. Conclusions Most of the groundwaters used for drinking water sup- ply in the South Pannonian Basin exhibited an unsatisfac- tory water quality, ...Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić. "Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment" in Polish Journal of Enivronmental Studies 21 no. 6, Olsztyn, Poland : Polish Journal of Enivronmental Studies (2012): 1783-1790
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Present Situation and Alternative Water Supply Solutions for Northern Vojvodina (Serbia)
The northern part of the Autonomous Province of Vojvodina is situated in the central and southeastern sectors of the Pannonian Basin. Drinking water supply is provided by groundwater abstraction from depths of 60 to 200 m. The quality of that water is poor, especially due to high concentrations of arsenic which most water supply systems do not remove. Current planning documents call for the construction of large regional water supply schemes on the banks of the Danube and Tisa ...Bojan Hajdin, Vesna Ristić-Vakanjac, Dušan Polomčić. "Present Situation and Alternative Water Supply Solutions for Northern Vojvodina (Serbia)" in Proceedings of Bulgarian Academy of Sciences, "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences (2020). https://doi.org/10.7546/CRABS.2020.04.09
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Karst wastewater as a high quality, renewable and within the circular economy water resource
Jovana Nikolić, Vesna Ristić Vakanjac (2021)High quality drinking water in it’s natural state is becoming less and less available to the human population. Based on the expected climate changes, it is considered that this resource will be less in the world but also in our region. Also, the accompanying polluting components that exceed the maximum allowable concentration are increasingly present in the waters. Even after the water treatment, it happens that some components are still in the drinking water, which adversely affects human health. ...Jovana Nikolić, Vesna Ristić Vakanjac. "Karst wastewater as a high quality, renewable and within the circular economy water resource" in Book of proceedings of the 3rd International Scientific Conference on vircular and bioeconomy CIBEK2021, Belgrade, Belgrade : School of Engineering Management (2021)
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The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system
Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic (2016)The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...микроемулзија, толуен, алкил полиглукозид, оксоалкохол етоксилат, појачивач ефикасности, „fish“ дијаграми... co-surfactant are used. In this case, the mass fraction of one of the surface-active components (0) in the mixture is defined as: 6= mol(mc + mo) (4) where the capital indices A, B, C, D refer to the com- ponents, water, oil, surfactant and co-surfactant, res- pectively. The so-called Ž-point ...
... librium of microemulsions containing nonionic surfact- ant, water and oil, has also been studied. It was found that water-soluble polymers expelled into the coexist- ent water phase cause the coexistence of the lamellar phase with water, which does not appear in the abs- ence of polymer [27]. ...
... BEHAVIOR OF A WATER/TOLUENE/ fTECHNICAL ALKYL POLYETHOXYLATE MICROEMULSION SYSTEM Article Highlights • Addition of sugar surfactant to system of water/tolune/Lutensol ON 50 was investigated • Sugarsurfactant shifts the phase behavior to lower temperature • Microemulsion of water/tolune/Lutensol ...Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic. "The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system" in Chemical Industry and Chemical Engineering Quarterly, National Library of Serbia (2016). https://doi.org/ 10.2298/CICEQ141105015I
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The analysis of the geothermal energy capacity for power generation in Serbia
Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)... ubility is affected by acidity/alkalinity of solu- tions and a variety of the salts present. Silica is rapidly dissolving in water of low pH values, such as pit water or water with elevated carbon dioxide. Silica solubility is rapidly increasing in groundwater containing Na2CO3, NaHCO3, NaOH or NaCl ...
... for use in the heat exchanger. Having passed through the heat exchanger, water is pumped back through the well into warm rock. This system has an additional advantage that the fluid (mostly salt water from ocean or polluted water from aquifer and hot rocks) never comes into contact with the turbine ...
... interpretation. In the absence of hot water resources, temperatures of deep thermal ground- water had to be obtained by geothermometers and considered for electricity generation in the Kalina or the Rankine binary cycle. The most perspective of the thermal water resources (tempera- tures from 130 °C ...Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk. "The analysis of the geothermal energy capacity for power generation in Serbia" in Thermal Science, National Library of Serbia (2013). https://doi.org/10.2298/TSCI120215033S