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Упит dcterms_subject_txt:backwater influence

319 items

  • 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

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje

  • Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays

    Vladimir Simić, Dragana Životić, Zoran Miladinović (2021)
    Management, Monitoring, Policy and Law,Nature and Landscape Conservation
    ... analysis and assessment of current situation in the mining industry in Serbia, presented in this paper, deals with some of the important factors that influence better val- orisation of IMR. Those factors include the existing regulatory framework in Serbia, access to land necessary for exploration/exploitation ...
    ... Carbonates In Serbian practice, differences in mineral and granulometric composition of a com- mon clay and the final products that are produced do not influence much the exploration process as rules are the same for all applications of common clays. It means that competent Resources 2021, 10, 63 5 of ...
    ... of Ceramic Clay Deposits in Western Serbia. Geol. Carpathica Ser. Clays 1997, 6, 57–60. Resources 2021, 10, 63 17 of 18 34. Simić, V. Influence of sedimentation conditions on the quality of refractory-ceramic clays. In Proceedings of the KoMSEKO ‘98, Kanjiža, Serbia, 4–7 June 1998; pp. 29–32 ...

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic

  • State and perspective of individual household heating in Serbia: A survey-based study

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    This paper presents the results of the household survey on individual household heating systems in Serbia. The survey was conducted in the period October to December 2020 with the participation of 1100 households with individual household heating systems. The information collected in the questionnaire can be separated into three main parts: basic household data, current heating system characteristics, and households’ perceptions and attitudes. The survey results provide unique and comprehensive information concerning individual household heating systems and the main ...
    Domaćinstva, Individualni sistemi grejanja, Korišćenje energije, Stavovi potrošača, Anketa, Srbija

  • 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
    ... is strongly driven by characteristics of available heat source. Besides selection of the appropriate heat pump technology, the heat source has influence on the placement of the heat pump unit, connection and operational modes, appropriate thermal capacity and range of operational temperatures for ...
    ... consideration the distance between heat sources and areas with DH. Analysis of economic feasibility of wastewater heat utilization showed the strong influence of the distance between WWTP and DH systems (Santin et al. 2020). Ðurđevic et al. (2019) analyzed and determined the potential for utilizing wastewater ...
    ... Conflicts of interest The authors declare that they have no known com- peting financial interests or personal relationships that could have ap- peared to influence the work reported in this paper. References Alekseiko LN, Slesarenko VV, Yudakov AA (2014) Combination of wastewater treatment plants and heat ...

  • 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

  • Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

    Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)
    The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...
    otpadne vode, toplotna pumpa, daljinsko grejanje, simulacija

  • Two approaches to compilation of bilingual multi-word terminology lists from lexical resources

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2020)
    In this paper, we present two approaches and the implemented system for bilingual terminology extraction that rely on an aligned bilingual domain corpus, a terminology extractor for a target language, and a tool for chunk alignment. The two approaches differ in the way terminology for the source language is obtained: the first relies on an existing domain terminology lexicon, while the second one uses a term extraction tool. For both approaches, four experiments were performed with two parameters being ...
    Linguistics and Language,Software,Artificial Intelligence,Language and Linguistics

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... dehydration which is obviously the main process during the thermal decomposition of plant biomass. The intercept is 0.067 and represents the mean influence of the initial composition of the biomass and the changes due thermal degradation. Decarboxylation and decarbonylation result in lower O/C and ...
    ... values. The results give an impression of the large variety of composition that can be found in chars of different origin and on the potential influence of extraneous material from the feedstock or the processes. The analysis of the inorganic components is inevitable at least for chars with high ...
    ... With the exception of SW500f, adsorption of water and oxygen was preferably found for the chars with high specific surface areas. Whereas the influence of adsorbed water and oxygen on the sum of surface functional groups is minor for most of the chars, about 30% ofthe O1s frac- tion is due to ...

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... increasing the costs. On the other hand, insufficient number of machines (dozers) will result in reduced execution of auxiliary operations, with influence on efficiency of continuous systems. Below is an example with CAT DSR and Shangai PD320Y-1. Optimal replacement те is established, based оп diagrams ...

  • Споменица 1991. – 2015. година: 135 година геологије и 70 година рударства на Универзитету у Београду

    главни и одговорни уредник Душан Поломчић (2016)
    Рударско-геолошки факултет
    ... the River Danube Caused by the HPP “Djerdap 1“ Backwater. Water Science and Technology, 70 (2), 376–385. IWA Publishing. DOI: 10.2166/wst.2014.230. POLOMČIĆ D., BAJIĆ D., ZARIĆ J., 2015: Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the ...
    ... , Adžić M., Fotev V., Milivojević A., Adžić V., Ivezić D., Ćosić B.: Influence of carbon dioxide content in the biogas on nitrogen oxides emissions, Hemijska Industrija, 2010. 19. Burić N., Todorović K., Vasović N.: Influence of interaction delays on noise- induced coherence in excitable systems ...
    ... Karanović L., Radmilović Vuk. V., Radmilović Velimir R.: Influence of alkali cation on the mechanical properties and durability of fly ash based geopolymers, Acta Chimica Slo- venica, 2013. 208. Mihailović J., Stefanović L., Stanković R.: Influence of Initial Treatment on the Survival and Recurrence ...

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... researches also point out an inhibitory influence of a great number of plants species on weeds. In this manner, Mikulas et al. (1994), examining the influence of the substances of aromatic and medicinal plants on weeds, established an extremely strong inhibitory influence of a marigold (Calendula officinalis) ...
    ... tions demonstrated effectively a fine structure of the mixed influence of two possible sources of the investigated metals in plant organs: the soil or the atmosphere. More precisely, it can be considered that the highest influence of the atmospheric deposition on metal contents was present in the ...
    ... rural areas. The drawbacks of the IG biofuels are: dependence on several feedstock materials that also have value for food industry, negative influence on the food/feed pricing and security, and a questionable potential to mitigate global warming., particularly when the increase of arable soil surface ...

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... socio-political criterion of using RESs in Serbia, experts’ judgments are implemented here, due to a lack of appropriate indicators to reflect the influence of each RES on the social and political dimension in Serbia. Therefore, to prioritize RESs regarding socio-political criterion, experts expressed ...
    ... C1 0.3488 S2 0.1695 0.2985 0.4603 C2 0.3236 S3 0.1257 0.1914 0.3139 C3 0.1661 S4 0.1261 0.1912 0.3081 C4 0.1615 1. Soil sealing (SC1) - Negative influence of electricity gen- eration from RESs on soil sealing (Artmann, 2014). In this manner, soil sealing is defined as the permanent covering of soil by ...
    ... competing interest The authors declare that they have no known competing finan- cial interests or personal relationships that could have appeared to influence the work reported in this paper. Acknowledgment This paper was supported by the Ministry of Education, Sci- ence and Technological Development of ...

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... impact on machines, employees, or the working environment. Such incidents are called risky events. In general, it can be said that an event that can influence the outcome of a defined objective (preventing, disabling, or slowing down the realization of a goal) can be considered a risky event. Managing, ...
    ... impact on machines, employees, or the working environment. Such incidents are called risky events. In general, it can be said that an event that can influence the outcome of a defined objective (preventing, disabling, or slowing down the realization of a goal) can be considered a risky event. Managing, ...
    ... with hybrid data. The final risk level assessment is presented in a continuous form. The proposed model minimizes the potential for analysts to influence the outcome of an assessment. The proposed model offers the possibility of reducing the number of iterations when the number of combinations is ...

  • Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac (2023)
    ... commonly used, represents the rock mass oscillation velocity. As the relation between rock mass oscillation velocity and the basic parameters that influence its magnitude, most often is used the M.A. Sadovskii equation where oscillation velocity V is given in the form of: v=K-R"; (D where R is reduced ...

  • Proučavanje razvića Bihaćkog i Cazinskog basena primenom gravimetrijskih podataka

    Snežana M. ignjatović, Ivana M. Vasiljević, Nevena R. Andrić-Tomašević, Ana S. Mladenović (2024)
    Bihaćki i Cazinski baseni su neogeni baseni, koji pripadaju spoljašnjim Dinaridima i formirani su tokom kasne faze razvoja Dinarida. Ovi baseni su od posebnog interesa zbog svoje geološke prošlosti i potencijalnih strukturnih karakteristika. U istraživanju, primenjeni su gravimetrijski podaci u clju boljeg razumevanja evolucije ovih basena. Primenom različitih postupaka matematičkih transformacija na gravimetrijskim podacima može se ustanoviti gravitacioni uticaj neogenih basena male gustine i mogu se detektovati strukture, koje su potencijalno vezane za njihovo formiranje. U ovom istraživanju, analiza ...
    matematičke transformacije podataka, kontakti, neogeni baseni

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... access and modify parameters of decision criteria, which adds more flexibility to the system. 2.4.3. Weight Coefficients Bearing in mind that the influence of individual factors, i.e., criteria is different, relative assessments by pairs of attributes at a hierarchical level were made, for all levels ...
    ... sensing was used to extract potential areas of anthropogenic impacts on the territory of Vojvodina, using morphological indicators of anthropogenic influence as the main criteria. Complying with the investors’ instructions, all the anthropogenic changes in the morphology of the terrain have been detected ...

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... temperature is from 5.9%C to 7.3"C [09]. The modern morphology of the terrain has been significantly changed. Surface mining of coal had the greatest influence on the change in terrain morphology (PK "Novi Kostolac", "Klenovnik" and "Ćirikovac", with disposal sites for overburden and ash, i.e., slag from ...