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Упит dcterms_subject_txt:water quality

406 items

  • Eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje

    Marko Lazić, Filip Miletić, Milena Lekić, Veljko Rupar, Željko Petrović, Lazar Žujović (2021)
    U radu su analizirani eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje. Period analize je prvih šest meseci tekuće godine. Analiza je vršena sa aspekta ostvarene proizvodnje, kvaliteta uglja, efektivnog vremena rada, kapacitetnog i vremenskog iskoršćenja i zastoja sistema. Za poređenje podataka različitih parametara koji po svojoj prirodi nisu međusobno uporedivi, u radu su korišćene metode višekriterijumskog odlučivanja.
    proizvodnja uglja, zastoji, metode višekriterijumskog odlučivanja
    ... open–pit mine Tamnava–West field for the first six months of the current year. The analysis was performed in the aspect of reached production, coal quality, effective working time, capacity and time utilization and system stoppage using multicriteria decision–making methods. Ključne reči: proizvodnja uglja ...

  • Development of integrated fuzzy model for mine management optimization

    Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)
    fuzzy logika, višekriterijumsko odlučivanje, ocenjivanje eksperata
    ... long, apering out to 1 m in the east). The ore body is vertical. T'he deposit is close to he land surface, at a depth of about 100 m, and the quality of the bauxite ore is igh. 'The geologic framework of the deposit was defined based on exploratory activ- ities, largely data collected from ...
    ... knowledge-based society. The authors would like to thank the editors and the anonymous referee for their suggestions, which have helped improve the quality of the paper. C. R. Acad. Bulg. Sci., 76, No 9, 2023 1419 REFERENCES 1| ZADEH L. A. (1965) Fuzzy sets, Information and Control, 8(3), 338-353 ...
    ... Engineering, Sarajevo. BAJIĆ D., D. POLOMČIĆ, J. RATKOVIĆ (2017) Multi-criteria decision analysis for he purposes of groundwater control system design, Water Resources Management, 81(15), 4759—4784, DOI: 10.1007/s11269-017-1777-4, 2017. 1I SAAry T.L. (1990) How to make a decision: The analytic hierarchy ...

  • Vodosnabdevanje i održivo upravljanje podzemnim vodnim resursima u Srbiji

    Dušan Polomčić, Zoran Stevanović, Dragoljub Bajić, Bojan Hajdin, Vesna Ristić-Vakanjac, Petar Dokmanović, Saša Milanović (2012)
    Slično većini evropskih zemalja, udeo podzemnih voda u javnom vodosnabdevanju u Srbiji je oko 75%. Najveće rezerve su akumulirane u vodonosnim naslagama intergranularne poroznosti neogene i kvartarne starosti, kao i u karstnim izdanima. One su jedini izvor vodosnabdevanja pijacom vodom za Vojvodinu i veći deo Srbije. Delovi sa malim rezervama podzemnih voda su Šumadija i južni delovi zemlje, gde se koriste u većoj meri površinske vode. Do sada izvedena hidrogeološka istraživanja pokazuju da se zahvata oko 30% obnovljivih rezervi ...
    ... public water supply to the citizens of Serbia, it has been noted that the alluvial aquifers are the most endangered, since their quality depends on the river water quality, as well as on the proximity of urban areas and the presence of agricultural and industrial activities. By passing the Water Act ...
    ... regulation. In accordance with the water management master plan of Serbia, the share of groundwaters that can be obtained through artificial aquifer recharge is about 40 m3/s. Referring to the legislation of the Republic of Serbia that defines the quality and the conditions for the protection ...
    ... in public water supply in Serbia is around 75%. The greatest groundwater reserves are accumulated in substantial neogene and quaternary water-bearing deposits of intergranular porosity, as well as in karstified carbonate rocks. These are the only source of water supply of drinking water in Vojvodina ...

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... asbestos) consists of long, flexible fibers, the best quality from the point of view considering the fiber's mechanical properties (the smaller the fiber diameter, the higher the radius of curvature) and the tolerance of the fiber to folding; the fiber quality of blue and brown asbestos is generally lower ...
    ... samples, and the lowest water content is also found for these samples (measured by the lower intensity of the 3200 cm—! broad band). The 3400 cm-! component may arise from the clay-based matrix [45] being, more or less transformed by the firing. We can expect that the lowest water content is related ...
    ... lizardite and chrysotile (called “white asbestos”), which have been used mostly in modern building and automotive applications [41] due to the high quality of the fibers (in terms of length, small diameter, etc.); the other main form is antigorite. Magnesium ions can be replaced by other elements such ...

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... cooled and extinguished in water. The fly ash and slag landfills in Serbia occupy an area of 1639 ha and if they are under constant control and monitoring, significantly influence the dis- ruption of the environment, which is reflected in the pollution of: air, soil, surface water and groundwater, vegetation ...
    ... laboratory tests show that fly ash and slag have variable chemical, mineralogical and physical properties that are dependent on the natural composition, quality of coal from basin, the manner of com- bustion and place of ash deposition. Article history: Manuscript received March 24, 2016 Revised manuscript ...
    ... conclusions can be drawn: – fly ash and slag have variable chemical, mineralogical and physical properties, and depend on the natural composition and quality of coal for each specific coal basin, – dependencies between the chemical, mineral and physical properties make a good basis for predicting and ...

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... Key words: availability of energy, energy indicators, energy security Introduction The increase of world population, along with the growth of quality of life, certain- ly leads to increasing demand for energy. Consumers around the world are facing with the problem of security of supply, volatility ...
    ... Besides rising of technological level of energy sector, improvement of energy efficien- cy, and consequently less energy consumption for the same quality of goods or services, has positive effect to SOS and SS. Increase of RES using for electricity and heat production im- proves SOS decreasing the ...
    ... building of new energy infrastructure and facilities, as well as improvement of existing one, can only bring benefits in terms of security and quality of life to the whole society. References [1] Ren, J., Sovacool, B. K., Quantifying, Measuring, and Strategizing Energy Security: Determining the ...

  • 2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja
    ... subsurface gas is present (methane, hydrogen-sulfide, carbon-monoxide, carbon-dioxide etc.), and hydrogeological measurements for the quality of the underground water. REFERENCES ALEXANDER, A. (2010) An Overview of Landfill Gas Energy, Landfill Methane Outreach Program (LMOP). ANDRADY, A. (2011) ...
    ... measurements and borehole data did show a groundwater level existed, that water reacts with the decomposing waste and creates and electrolyte with a very low resistivity value. The fibrous minerals do not react with water nor with acid solutions except chrysotile which in a reaction with acidic ...
    ... (Marković and Stevović, 2016). The presence of water vapor 74 Sretenović B., Arnaut F., Vasiljević I., Cvetkov V. can speed up the process of gas production. This is of great value for the examined terrain “Ada Huja” because underground water level was detected. 4 CORRECT ECOLOGICAL AND ...

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Analiza sistema odvodnjavanja površinskog kopa Drmno od podzemnih voda sa severnim savršenim ekranom

    Tomislav Šubaranović, Dušan Polomčić, Vladimir Pavlović (2019)
    Izrada nesavršenog ekrana do drugog sloja uglja na površinskom kopu Drmno, pored zadržavanja postojećih standardnih metoda odvodnjavanja od podzemnih voda linijama bunara, predviđena je poslednje decenije u celokupnoj rudarskoj projektnoj dokumentaciji. Iz objektivnih i subjektivnih razloga njegova realizacija nije ostvarena do danas. U međuvremenu je, uz dodatna geološka istraživanja i promenu dinamike i parametara sistema površinske eksploatacije, došlo do određenih značajnih prostornih promena geoloških i rudarskih uslova u eksploatacionom polju. Ovo je omogućilo preliminarno inoviranje pristupa procesu i konceptu ...
    podzemne vode, odvodnjavanje, bunari, ekran, dinamika, troškovi

  • An oilfield in Libya: A new model to enhance waste water disposal

    Dušan Danilović, Vesna Karović Maričić, Nori Elhaddad, Branko Leković (2016)
    нафта, лежишне воде, припрема

  • Improvement of geodatabase queries within GeolISS

    Ranka Stanković (2008)
    ... exploration of such a valuable source of geologic data in view of the diversity and amount of archived data, which is of paramount importance for the quality of results obtained by the query, can be substantially improved by using various lexical resources, such as morphological dictionaries and a geological ...
    ... Ranka Stanković 70 4. Web service for query expansion Selection of words chosen for a query, which are of paramount importance for the quality of results obtained by the query, can be substantially improved by using various lexical resources. Morphological dictionaries enable morphological ...

  • Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils

    Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov (2021)
    MICP process, kinetic study, calcite, vaterite, MALDI-TOF identification, Bacillus licheniformis, Sporosarcina pasteurii
    ... modify soil characteristics resulting in stabilization from the action of wind and water erosion [3], removing heavy metals from wastewaters [4], or promoting the self-healing effect of calcareous materials [5]. The water absorption of the monumental limestone was reduced by 60% after the MICP treatment ...
    ... modify soil characteristics resulting in stabilization from the action of wind and water erosion [3], removing heavy metals from wastewaters [4], or promoting the self-healing effect of calcareous materials [5]. The water absorption of the monumental limestone was reduced by 60% after the MICP treatment ...
    ... error rates at the species level of wild isolates compared to VITEK2 Compact System. It might be concluded that MALDI-TOF identification has a better quality of base for the identification of non-clinical isolates than the VITEK2 Compact System. For this reason, but also since the obtained identification ...

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... function of the formation volume factor, the oil formation volume factor Bo (m*/m*), and the water formation volume factor Bw (m?/m?): qo+qw 32 n qoBo+qwBw — qo - oil production, (m*/m*) — qw- water production, (m?/m?) If all the gas passes through the pump, the volumetric efficiency increases ...
    ... Figure 3.1. Underground Equipment for Sucker Rod Pump 10 3.1.1 Plunger of a Sucker Rod Pump The plunger of a deep well pump is crafted from high-quality steel tubing. A molten metal layer is applied to the heated surface of the plunger, which is then ground and polished. The outer surface of the ...
    ... reduced to the full cross-section of the annular space of the anchor without gas (m/s) 3.3 Sucker Rods Sucker rods are manufactured from high-quality steel with a solid round cross-section and are used to transmit energy from the surface equipment (horsehead) to the downhole pump. Their lengths ...

  • Structural characterization of traditional pottery produced from local clay, Rujište (Ražanj, Central Serbia), in an effort to preserve its geoheritage

    Maja Milošević, Biljana Đorđević, Alena Zdravković (2021)
    ... (“pottery sand”). According to the manufacturers, there are no additional components, because the clays themselves meet the conditions for making quality vessels meant for thermal processing of food. The technic of making of this bread-baking pans -crepulja- is very simple at first sight – hand-making ...

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... • Methods of water research in karst. • Characterization and conceptual definition of water circulation in karst, connection with otherT aquifers and surface Waters. • Water balancing in karst, the problem of delineating watersheds. • Specifics of the quantity and quality dynamics of karst ...
    ... groundwater quality in the test areas, CCWatersS – Climate Change and Impact on Water Supply., Edt. Stevanović Z., Ristić Vakanjac V., Milanović S. University of Belgrade-FFaculty of Mining & Geology, Belgrade, pp. 259-285. Ristić Vakanjac, V., Stevanović, Z., Milanović, S. (2012): Availability of water resources ...
    ... fluorescent lamp, protective suits, standards and other supporting equipment). In-situ water quality monitoring The CKH is equipped with modern devices for testing the physico-chemical parameters of water directly in the field. CKH has devices for measuring: T (*C), pH, Turbidity (NTU), EFlectrical ...

  • Development of an integrated model for open-pit-mine discontinuous haulage system optimization

    Miodrag Čelebić, Dragoljub Bajić, Sanja Bajić, Mirjana Banković, Duško Torbica, Aleksej Milošević , Dejan Stevanović (2024)
    equipment selection, mine mechanization, expert judgment, linguistic variables, MCDM, FAHP

  • Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike

    Мирослав Црногорац, Душан Даниловић, Лола Томић (2020)
    ... ethical water behavior favors long-term water governance structures for maintaining quality of life and environmental sustainability in the face of an ongoing crisis situation for water conservation and environmental degradation. Keywords: Water Ethics, Environmental Sustainability, Water Resources ...
    ... regarding to maintain water resources to alleviation their quality deterioration which is based on realizing and warning for the lack of sufficient available water resources to meet the demands of water usage, in addition to the serious consequences of water scarcity and water resources contamination ...
    ... have placed additional stress on the water resources worldwide, in addition to contributing to the increase in water pollution. Environmental experts and ethicists have warned against the dire consequences to humans and ecosystems should the quality of water in its sources continue to deplete. It ...

  • Fault type assessment based on vertical gravity gradient anomalies – advantages and limitations

    Ivana Vasiljević, Snežana Ignjatović, Branislav Sretković (2024)
    The type of dip-slip faults can be assessed based on the analysis of vertical gravity gradients. Theoretically, just a simple comparation of the gradient extreme values can give us an answer whether the fault is normal or reverse (thrust). Practical application of this method is far more complicated and the results depend on a number of parameters, such as a complexity of geological setting, the quality of gravity data, dip angle and displacement of the fault, density contrast, etc. ...
    dip-slip faults, vertical gravity gradients, field data analysis
    ... application of this method is far more complicated and the results depend on a number of parameters, such as a complexity of geological setting, the quality of gravity data, dip angle and displacement of the fault, density contrast, etc. Both the advantages and the limitations of the method based on using ...
    ... OLIIIITHHA HOBALIH Hristina Petrova, Pera Stojkovska, Dimitar Petrov 114 117 125 133 139 148 156 10. HYDROGEOLOGICAL RESEARCH FOR THE WATER SUPPLY NEEDS OF THE CITY OF SREBRENIK, BOSNIA AND HERZEGOVINA Meris Hajdarević, Dinka Pašić-Škripić, Izet Žigić O GG 160 MEPKH H AKTHBHOCTH 3A ...

  • Ecological status of the Lim river alluvium in Serbia

    Amel Kurbegović, Boris Vakanjac, Vesna Ristić Vakanjac, Mirjana Bartula, Zorana Naunović, Nikola Milovanović, Jovan Kovačević (2022)
    Three countries share the catchment of the Lim River and they have been engaged in an eco-logical struggle for years, to conserve the river, its tributaries, and biodiversity. Honoring international conventions and declarations, along with active involvement of the civil society and support of Eu-ropean Union agencies, major efforts are being made to draw attention to the degradation of nature, especially water, which is essential for life on the planet Earth. Considering that natural resources are limited and that ...
    aluvijum, zagađenje vode, ekološki status, reka Lim