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1068 items
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Development of the hybrid MCDM model for evaluating and selecting bucket wheel excavators for the modernization process
This paper presents a methodology for evaluating and ranking different bucket wheel excavators (BWE) for determining which machine should enter in the process of revitalization and modernization. Various multicriteria methods are used. Combining them achieves the best effect when choosing BVE for the modernization process. AHP, TOPSIS, VIKOR, and PROMETHEE methods are used. The hybrid models are developed from the multi-criteria decision making (MCDM) methods and they are used to evaluate the basic indicators that characterize the operation of ...Snezana Savkovic, Predrag Jovancic, Stevan Djenadic, Milos Tanasijevic, Filip Miletic. "Development of the hybrid MCDM model for evaluating and selecting bucket wheel excavators for the modernization process" in Expert Systems with Applications, Elsevier BV (2022). https://doi.org/10.1016/j.eswa.2022.117199
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Characterization of bituminite in Kimmeridge Clay by confocal laser scanning and atomic force microscopy
Paul C. Hackley, Jolanta Kus, João Graciano Mendonça Filho, Andrew D. Czaja, Angeles G. Borrego, Dragana Životić, Brett J. Valentine, Javin J. Hatcheries (2022)This work investigates bituminite (amorphous sedimentary organic matter) in Upper Jurassic Kimmeridge Clay source rock via confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM). These petrographic tools were used to provide better understanding of the nature of bituminite, which has been historically difficult to identify and differentiate from similar organic matter types in source rocks. As part of an International Committee for Coal and Organic Petrology (ICCP) working group, an immature (0.42% vitrinite reflectance), organic-rich (44.1 wt% ...Битуминит, Kонфокална ласерска скенирајућа микроскопија, Mикроскопија атомских сила, Органска петрологија, Термичка зрелостPaul C. Hackley, Jolanta Kus, João Graciano Mendonça Filho, Andrew D. Czaja, Angeles G. Borrego, Dragana Životić, Brett J. Valentine, Javin J. Hatcheries. "Characterization of bituminite in Kimmeridge Clay by confocal laser scanning and atomic force microscopy" in International Journal of Coal Geology, Elsevier BV (2022). https://doi.org/10.1016/j.coal.2022.103927
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Connections between the Levant and the Balkans in the late Middle Pleistocene: Archaeological findings from Velika and Mala Balanica Caves (Serbia)
Dušan Mihailović, Steven L. Kuhn, Katarina Bogićević, Vesna Dimitrijević, Ana B. Marín-Arroyo, Jelena Marković, Norbert Mercier, Bojana Mihailović, Mike W. Morley, Predrag Radović, William J. Rink, Senka Plavšić, Mirjana Roksandić (2022)Major changes in the technological, economic, and social behavior of Middle Pleistocene hominins occurred at the onset of the Middle Paleolithic, 400e200 ka. However, until recently it was not possible to establish when, where, and how certain forms of Middle Paleolithic behavior appeared and spread into Southeastern Europe, mainly owing to gaps in the Paleolithic record. Here we report new results of dating, material culture, and the archaeological context of finds from the Balanica Cave Complex in Sicevo (Serbia). ...Dušan Mihailović, Steven L. Kuhn, Katarina Bogićević, Vesna Dimitrijević, Ana B. Marín-Arroyo, Jelena Marković, Norbert Mercier, Bojana Mihailović, Mike W. Morley, Predrag Radović, William J. Rink, Senka Plavšić, Mirjana Roksandić . "Connections between the Levant and the Balkans in the late Middle Pleistocene: Archaeological findings from Velika and Mala Balanica Caves (Serbia)" in Journal of Human Evolution (2022)
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Geoheritage and Mining Heritage in the Promotion of Theme Parks: An Example of the National Park Đerdap (Carpathian-Balkan Thrust-And-Fold Belt, Eastern Serbia)
The National Park Đerdap (eastern Serbia, vicinity of the Danube River) occupies a segment of the Carpathian-Balkan fold-and-thrust belt and has a significant geoheritage potential, accounting for the impressive natural (geological) and cultural legacy. In addition to the extraordinary orogenic-type landscape or nappe-stacked mountainous configura tion, the region contains evidence of ancient mining activities, uncovered within its immediate neighbourhood. The ancient mining activities date back a few thousand years ago and represent a solid ground for the idea of ...Karpatobalkanski pojas nabora i navlaka, Geopark Djerdap, Tematski park "Muzej rudarstva", Konzervacija, Održivi razvoj, Geotopi, SrbijaIvana Mojsić Velikić, Dragoman Rabrenović, Danica Srećković-Batoćanin, Darko Spahić. "Geoheritage and Mining Heritage in the Promotion of Theme Parks: An Example of the National Park Đerdap (Carpathian-Balkan Thrust-And-Fold Belt, Eastern Serbia)" in Geoheritage, Springer Science and Business Media LLC (2022). https://doi.org/10.1007/s12371-022-00735-3
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100th Anniversary of the Carpathian-Balkan Geological Association (CBGA)
Ljupko Rundić (2022)Током 22. конгреса Карпатско-балканске геолошке асоцијације (KБГА) одржаног у Пловдиву, Бугарска (7–11. Септембар, 2022) обележена je стогодишњица оснивања KБГА. Резолуција о оснивању „Карпатске геолошке асоцијације“ усвојена је на 13. Међународног геолошком конгресу у Бриселу, 19. августа 1922.године. То је био резултат ранијих напора и иницијативе Р. Кетнера (Чехословачка), Ј. Новака (Пољска), Г. Мунтеану Мургочија (Румунија) и В. Петковића (Југославија). Касније, после Другог светског рата, асоцијација мења назив у „Карпатско-балканска геолошка асоцијација (КБГА) “. Током протеклих 100 година, КБГА је ...Ljupko Rundić. "100th Anniversary of the Carpathian-Balkan Geological Association (CBGA)" in Геолошки анали Балканскога полуострва, Београд : Рударско-геолошки факултет (2022). https://doi.org/10.2298/GABP221103006R
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Hydrochemical indicators of groundwater flow in the area of “Čukaru Peki” Cu-Au underground mine in eastern Serbia
The physical and chemical properties of groundwater, together with the groundwater levels regime and rock hydraulic properties, are often used to understand and conceptualize the hydrogeological system. Prediction of the influence of mining works on groundwater, and vice versa, is a challenge due to significantly altered groundwater flow patterns in the raw materials exploitation areas in relation to natural conditions. Therefore, multiple parameters are assessed and monitored before and during exploitation to properly characterize and quantify the system for ...Nebojša Atanacković, Vladimir Živanović, Jana Štrbački, Veselin Dragišić, Ivana Cvejić. "Hydrochemical indicators of groundwater flow in the area of “Čukaru Peki” Cu-Au underground mine in eastern Serbia" in 5th IAH CEG conference, Slovenian Committee of International Association of Hydrogeologists - SKIAH (2022)
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Examination of the possibility of obtaining pyrite concentrate from the flotation tailings of the Lece mine
Рудник Леце је карактеристичан по томе што у флотацијским концентратима олова и цинка као корисну примену има злато и сребро. Практично од отварања рудника и флотације трају истраживања и борба за што боље технолошке показатеље на сва четири платива метала (олово, цинк, злато и сребро) посебно на злату. Овај рад представља допринос тој борби у циљу повећања искоришћења злата. Како је начин појављивања злата веома различит (самородно, са оловом и цинком, са пиритом и кварцом) то је и технолошка ...Predrag Lazić, Đurica Nikšić, Dejan Stojanović, Tamara Stojanović. "Examination of the possibility of obtaining pyrite concentrate from the flotation tailings of the Lece mine" in Underground Mining Engineering, University of Belgrade, Faculty of Mining and Geology (2022)
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The impact of temporal variability of groundwater levels on groundwater vulnerability maps in karst terrains – a case example of the Perućac spring catchment area
Groundwater vulnerability maps represent an essential tool for protecting karst groundwater resources. Vulnerability assessment is usually based on spatial evaluation of various parameters that affect the vulnerability degree and regulate the protection role of the unsaturated zone. Most of these parameters, like soil and geology conditions, are constant and do not change during the year or over several years. In contrast, some parameters, such as the groundwater level, depend on the variability of recharge conditions. By considering the variability ...Vladimir Živanović, Igor Jemcov, Nebojša Atanacković. "The impact of temporal variability of groundwater levels on groundwater vulnerability maps in karst terrains – a case example of the Perućac spring catchment area" in 5th IAH CEG conference, Slovenian Committee of International Association of Hydrogeologists - SKIAH (2022)
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Determining the Impact of Cutting Elements State on the Bucket–Wheel Excavator Vibration and Energy Consumption
Background There are two types of specifc sizes’ measurements. The frst is the measurement of energy consumption in a working technological process, and the second is the measurement of vibration, which is displayed over amplitudes of speed. There is an interplay between these two processes. Increasing the power consumption, the value of the vibration speed amplitudes increases. Purpose The process of the determination of machining parameters was based on minimizing the power consumption and vibration of the cutting tool, ...Filip Miletić, Predrag Jovančić, Miloš Milovančević, Miloš Tanasijević, Stevan Đenadić. "Determining the Impact of Cutting Elements State on the Bucket–Wheel Excavator Vibration and Energy Consumption" in Journal of Vibration Engineering & Technologies, Springer (2022). https://doi.org/10.1007/s42417-022-00482-3
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Distribution of Potentially Toxic Elements in the City of Zintan and Its Surroundings (Northwestern Libya) by Surface Soil Sampling
Boris Vakanjac, Zorana Naunović, Vesna Ristić Vakanjac, Tanita Đumić, Saša Bakrač, Jana Štrbački, Vuk Gajić, Taher Mohamed Alzarog (2023)The study area is the city of Zintan, in northwestern Libya, which has grown over the past 30 years. Its current population is roughly 30,000. Although the city is in part commercial, most of the population engages in agriculture and primarily grows cereal crops (wheat and barley). The demand of the growing city for agricultural products has increased, intensifying the use of fertilizers, pesticides, and insecticides. Consequently, concentrations of potentially toxic elements (PTE) in the soil have increased. To ...Boris Vakanjac, Zorana Naunović, Vesna Ristić Vakanjac, Tanita Đumić, Saša Bakrač, Jana Štrbački, Vuk Gajić, Taher Mohamed Alzarog. "Distribution of Potentially Toxic Elements in the City of Zintan and Its Surroundings (Northwestern Libya) by Surface Soil Sampling" in Minerals, MDPI AG (2023). https://doi.org/10.3390/min13081048
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Ground surface subsidence monitoring using sentinel-1 in the “Kostolac” open pit coal mine
Zoran Gojković, Milan Kilibarda, Ljiljana Brajović, Miloš Marjanović, Aleksandar Milutinović, Aleksandar Ganić (2023)Open pit coal mining affects surrounding populated areas, resulting in terrain surface deformation. Surface deformation should be monitored as often as possible to control deformations and prevent potential incidents. This paper analyzes time series deformation estimated from the Sentinel-1 satellite images using the Persistent Scatterer Interferometry method to monitor subsidence rates caused by open pit mining activities. It is possible to measure deformations using classical geodetic methods, but those are rarely used in practice because they are time-consuming and ...Zoran Gojković, Milan Kilibarda, Ljiljana Brajović, Miloš Marjanović, Aleksandar Milutinović, Aleksandar Ganić. "Ground surface subsidence monitoring using sentinel-1 in the “Kostolac” open pit coal mine" in Remote Sensing (2023). https://doi.org/10.3390/rs15102519
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Blasting mats for the protection of people, structures and the environment in proximity to the blast site
Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)Енергија експлозије која се ослобађа током процеса детонације минских пуњења у бушотинама користи се за дробљење чврсте стенске масе на комаде различитих облика и величина, у зависности од карактеристика стене и оптимизације параметара бушења и минирања. Поред позитивних ефеката минирања, постоје и одређени нежељени ефекти сваког процеса минирања који се могу јавити, а то су: потреси тла, разлетање комада одминираног материјала, ваздушни удари, загушљиви и отровни гасови и прашина. Разлетање комада је неконтролисано избацивање комада одминиране стенске масе и ...Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović. "Blasting mats for the protection of people, structures and the environment in proximity to the blast site" in 30th International Conference Ecological Truth and Environmental Research – Ecoter’23, Stara Planina, Serbia, 20–23 Jun 2023, Bor : University of Belgrade, Technical Faculty in Bor (2023)
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An example of karst catchment delineation for prioritizing the protection of an intact natural area
Vesna Ristić Vakanjac, Zoran Stevanović, Aleksandra Maran Stevanović, Boris Vakanjac, Marina Čokorilo Ilić (2015)Проучавано је карстни извор Перућац као главни дрен подручја планине Таре у западној Србији у циљу процене његовог режима отицања, резерви воде и дефинисања његове сливне површине. Извор се налази у североисточној, унутрашњој зони класичног динарског крша, коју карактерише доминантно проширење висококарстификованих тријаских кречњака, слабо развијена хидрографска мрежа са много понора и густе шуме. Тара је један од пет националних паркова у Србији. Циљ рада је био да се идентификује заштитна зона високог приоритета у оквиру очуваног природног подручја ...Vesna Ristić Vakanjac, Zoran Stevanović, Aleksandra Maran Stevanović, Boris Vakanjac, Marina Čokorilo Ilić. "An example of karst catchment delineation for prioritizing the protection of an intact natural area" in Environmental Earth Science (2015). https://doi.org/10.1007/s12665-015-4390-y
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Turbidity simulation for short-term prediction: case study of the karst spring Surdup (Bor, Serbia)
Из перспективе снабдевања пијаћом водом, квалитет воде карстних издани је међу највишим, и често захтева само њихову дезинфекцију пре употребе. Међутим, карстне подземне воде изложене су одређеним притисцима. Током сушних периода углавном има мало воде, а током кишних периода има изненадних променa и квалитета и количине воде. Реакција слива на падавине је често брза и варијације у параметрима квалитета и квантитета (истицање, ниво вода, замућеност, укупан број микроорганизама, суспендовани нанос, итд.) су нестабилни. Ово захтева праћење истицања и ...Marina Pešić, Vesna Ristić Vakanjac, Boris Vakanjac, Kostadin Jovanov. "Turbidity simulation for short-term prediction: case study of the karst spring Surdup (Bor, Serbia)" in Comptes rendus de l'Academie bulgare des Sciences, Bulgarian academy of science (2016)
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Investigation of accessory elements of representative petrologic radioactivity carriers at Stara Planina, Serbia
Boris Vakanjac, Ivana Jelic, Milena Rikalovic, Vesna Ristic-Vakanjac, Dusan Nikezic, Zorana Naunovic, Slavko Dimovic (2019)Ова студија се бави обиљем најчешћих акцесорних елемената носилаца радиоактивности на Старој планини на четири дефинисане локације. Све истраживане локације имају повећану радиоактивност, већу од 200 цпс, до 1250 цпс. У свим испитиваним узорцима детектовани су следећи елементи и одређене њихове концентрације: Зр, Рб, В, Мо, Сн, Зн, Цу, Ас, Сб, Ба, Ни, Цр, В и Ти. Анализа је показала да су у зависности од узорка утврђене повишене концентрације свих детектованих елемената осим титана. Како се сви локалитети који ...Boris Vakanjac, Ivana Jelic, Milena Rikalovic, Vesna Ristic-Vakanjac, Dusan Nikezic, Zorana Naunovic, Slavko Dimovic. "Investigation of accessory elements of representative petrologic radioactivity carriers at Stara Planina, Serbia" in Nuclear Technology and Radiation Protection (2019). https://doi.org/10.2298/NTRP190709039V
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Assessment of environmental radioactivity and health hazard at Stara Planina region
Slavko Dimovic, Boris Vakanjac, Ivana Jelic, Milena Rikalovic, Vesna Ristic-Vakanjac, Radoje Bankovic (2021)Циљ студије је био да се процени потенцијални ризик од зрачења у близини напуштених рудника уранијума, јаловишта или лежишта уранијума на Старој планини у Србији. За процену ризика одређено је неколико параметара: активност еквивалента радијума, Raeq, екстерни индекс опасности, Hex, брзина апсорбоване дозе гама зрачења, D, годишња ефективна доза на позадинској експозицији гама гама на отвореном, AEDoutdoor и ризик од рака током живота, ELCR. Добијени резултати су показали да сви узорци, осим једног, имају Raeq вредност и до два ...Slavko Dimovic, Boris Vakanjac, Ivana Jelic, Milena Rikalovic, Vesna Ristic-Vakanjac, Radoje Bankovic. "Assessment of environmental radioactivity and health hazard at Stara Planina region" in Nuclear Technology and Radiation Protection (2021). https://doi.org/10.2298/NTRP2004354D
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Complex geophysical survey on solving the problem of water loss in the karst terrain reservoir
Branislav Sretković, Dejan Vučković (2023)Geophysical surveys in karst terrain are always a specific challenge. Each of them requires a careful consideration of the problem, specific conditions on the ground, the selection of adequate methods applicable in that specific and unique karst area. But they should have one thing in common: a complex approach and looking at the problem from wider to narrower, with a gradual narrowing of the investigation area, increasing the spatial precision and resolution of the obtained data. On the example of ...Branislav Sretković, Dejan Vučković. "Complex geophysical survey on solving the problem of water loss in the karst terrain reservoir" in 8th Symposium Geoscience 2023, Bucharest, 9-11. November 2023, Bucharest : Editura Cetatea de Scaun (2023)
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Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics
Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić. "Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics" in Minerals, MDPI AG (2024). https://doi.org/10.3390/min14050511
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OntoLex Publication Made Easy: A Dataset of Verbal Aspectual Pairs for Bosnian, Croatian and Serbian
Ovaj rad predstavlja novi jezički resurs za pretraživanje i istraživanje verbalnih aspektnih parova u BCS (bosanskom, hrvatskom i srpskom), kreiran korišćenjem principa Lingvističkih Povezanih Otvorenih Podataka (LLOD). Pošto ne postoji resurs koji bi pomogao učenicima bosanskog, hrvatskog i srpskog kao stranih jezika da prepoznaju aspekt glagola ili njegove parove, kreirali smo novi resurs koji će korisnicima pružiti informacije o aspektu, kao i link ka aspektnim parovima glagola. Ovaj resurs takođe sadrži spoljne linkove ka monolingvalnim rečnicima, Wordnetu i BabelNetu. ...Ranka Stanković, Maxim Ionov, Medina Bajtarević, Lorena Ninčević. "OntoLex Publication Made Easy: A Dataset of Verbal Aspectual Pairs for Bosnian, Croatian and Serbian" in Proceedings of the 9th Workshop on Linked Data in Linguistics @ LREC-COLING 2024, Turin, 20-25 May 2024, ELRA and ICCL (2024)
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Upper Cretaceous scaglia type limestone from Klepa Mts. (North Macedonia) - sedimentology and biostratigraphy
The research area is located in the central part of North Macedonia, in the area of the Klepa Mts. Based on sedimentological, micropaleontological and biostratigraphical investigations of samples from both the east and west side of the Klepa Mts., sedimentary rocks of the Upper Creaceous age are determined. During the latest Cretaceous, this area was dominated by the sedimentation of dominantly carbonate rocks with variable amounts of clastic components. From the tectonic point of view, investigated area belongs to the ...Violeta Gajić, Milena Dunčić, Ana Mladenović, Dejan Prelević. "Upper Cretaceous scaglia type limestone from Klepa Mts. (North Macedonia) - sedimentology and biostratigraphy" in EGU General Assembly 2024, European Geosciences Union (2024). https://doi.org/10.5194/egusphere-egu24-21298