Претрага
2778 items
-
Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules
The stability analysis of homogeneous rock slope following the Hoek–Brown failure criterion under the hypothesis of different flow rules is performed based on limit equilibrium and finite element methods. The applied failure criterion is the generalized Hoek–Brown that can be introduced as a shear/normal function in analysis applying different flow rules. The results are compared with those obtained by the application of equivalent shear strength parameters of the Mohr–Coulomb criterion, considering that this is still the most widely used ...Kružna klizna površ, Huk-Braunov kriterijum loma, Kriterijum popuštanja, Smičuća/normalna funkcija, Nivo napona, Verovatnoća i parametarska analizaSvetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón . "Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules" in Bulletin of Engineering Geology and the Environment , Springer (2024). https://doi.org/10.1007/s10064-024-03667-0
-
Centar za hidrogeologiju karsta - 15 godina nauke i struke
... with the research of groundwater resources of the karst terrains of Serbia, Montenegro and „Bosnia and · Herzegovina, management of groundwater resources, GIS analyzes of hydrogeological data, stochastic modeling and time series analyzes of karst water discharge and quality, groundwater protection ...
... undergraduate and master studies in the area of hydrogeological research, especialy concerning water quality, defining of specific components of karst groundwater, preparation and analysis of water from various types of rocks, sampling and analysis of rocks and soil, as well as sample preparation ...
... "The Functioning and Impact of Epikarst on the Regime, Balance and Groundwater Quality of the Eastern Part of the Suva Planina Mountain Karst System". Branislav Petrović has almost 20 years of engineering and hydrogeological experience in the design and implementation of research projects and studies ...urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović. Centar za hidrogeologiju karsta - 15 godina nauke i struke, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet, Centar za hidrogeologiju karsta, 2023
-
Proizvodnja električne energije iz elektrana na ugalј i prateća emisija CO2: komparacija EU-27 i Srbije
Velike elektrane su i u trećoj deceniji 21. veka i dalјe odgovorne za više od polovine proizvodnje električne energije u Evropi. U svom radu pretežno koriste fosilna goriva, što rezultira emisijom zagađujućih materija u vazduh. Stoga, zahvalјujući direktivama EU, kao i poremećajima na tržištu, emisije uglјen-dioksida iz velikih postrojenja za sagorevanje u EU-27 intenzivno se smanjuju u poslednje dve decenije. Iako je upotreba uglјa, posebno u zemlјama Evropske unije, u stalnom padu, ima prostora za dodatno smanjenje. Autori su ...Aleksandar Madžarević, Predrag Jovančić, Stevan Đenadić, Filip Miletić, Miroslav Crnogorac. "Proizvodnja električne energije iz elektrana na ugalј i prateća emisija CO2: komparacija EU-27 i Srbije" in Energija, ekonomija, ekologija (2023). https://doi.org/10.46793/EEE23-2.44M
-
Српски језик у дигиталном добу -- The Serbian Language in the Digital Age
Duško Vitas, Ljubomir Popović, Cvetana Krstev, Ivan Obradović, Gordana Pavlović-Lažetić, Mladen Stanojević (2012)... SpeechProcessing: uality of existing speech recog- nition technologies, quality of existing speech syn- thesis technologies, coverage of domains, number and size of existing speech corpora, amount and va- riety of available speech-based applications ‚ Machine Translation: uality of existing MT tech- nologies ...
... coverage of linguistic phenomena and do- mains, amount and variety of available applications, quality and size of existing (annotated) text corpora, quality and coverage of existing lexical resources (e. g., WordNet) and grammars ‚ Resources: uality and size of existing text corpora, speech corpora ...
... that do notmake use of deeper lin- guisticmethods and knowledge. For example, sentences are automatically translated by comparing a new sen- tence against thousands of sentences previously trans- lated by humans. e quality of the output largely de- pends on the amount and quality of the available sam- ...Duško Vitas, Ljubomir Popović, Cvetana Krstev, Ivan Obradović, Gordana Pavlović-Lažetić, Mladen Stanojević. "Српски језик у дигиталном добу -- The Serbian Language in the Digital Age" in META-NET White Paper Series, G. Rehm, H. Uszkoreit (eds.), Springer (2012)
-
Hidrogeoekološki uslovi eksploatacije kamenih i mrkih ugljeva Srbije
Branko R. Miladinović (2016-04-27)Ugalj predstavlja energent na čijoj osnovi se razvija privreda celog sveta.Zato mu se pridaje velika pažnja u eksploataciji i preradi, bez obzira na mnogeštetne uticaje na životnu sredinu, a posebno na efekat staklene bašte koji sestvara emisijom zagađujućih materija u atmosferu radom termoelektrana naugalj.U Srbiji, resurs koji se danas u najvećoj meri koristi u proizvodnjielektrične energije je ugalj i on učestvuje u proseku sa 70 %. U strukturi ukupneproizvodnje ugljeva, dominiraju lignitski ugljevi sa učešćem od 98 %, a ...Srbija, kameni i mrki ugalj, podzemna eksploatacija, preradauglja, rudničke vode, hemijski sastav, emisija zagađujućih materija, životnasredina... “Accounting for total harm from coal would add ‘close to 17.8¢/kWh of electricity generated” Climate Progress (www.thinkprogress.org/climate). 77. Róžkowski A., 1997: Impact of coal mining on quality and quantity of fresh groundwater in the Upper Silesian Coal Basin (Poland), 6th Intern. Mine ...
... pollutants from coal-fired thermoelectric power plants into the atmosphere. In Serbia, coal is the most widely used resource for electric power generation, with an average share of 70%. Regarding the types of coal, the proportion of brown coal is 98% and that of black lignite and hard coal 2% (2012) ...
... occur in coal seam roofs and floors, and b) mine water with a TDS of M>1000 mg/L, which occur within the coal seams themselves. Within coal seams, the chemical composition of groundwater metamorphoses as a function of depth, forming the HCO3-Na, SO4-HCO3-Na, SO4-Na or Cl-Na type of groundwater ...Branko R. Miladinović. "Hidrogeoekološki uslovi eksploatacije kamenih i mrkih ugljeva Srbije" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-04-27)
-
Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support
Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović. "Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support" in Journal of Vibroengineering (2017). https://doi.org/10.21595/jve.2016.17321
-
The Importance of Detailed Groundwater Monitoring for Underground Structure in Karst (Case Study: HPP Pirot, Southeastern Serbia)
... Figure 5. (a) Changes of groundwater level at PP-3 (b) Operating time—HPP work time and pressure stabilization. Water 2019, 11, 603 7 of 10 In addition to pronounced groundwater level fluctuations at PP-3, there were also changes in groundwater quality. Vertical probing of EC in observation well ...
... establishment of detailed monitoring of quantitative and qualitative parameters of groundwater in the zone of possible interactions between a water-conveyance tunnel and the geologic/hydrogeologic environment is of the utmost importance for assessing the risk of adverse effects and of tunnel performance ...
... establishment of detailed monitoring of quantitative and qualitative parameters of groundwater in the zone of possible interactions between a water-conveyance tunnel and the geologic/hydrogeologic environment is of the utmost importance for assessing the risk of adverse effects and of tunnel performance ...Marina Čokorilo Ilić, Ana Mladenović, Marina Ćuk, Igor Jemcov. "The Importance of Detailed Groundwater Monitoring for Underground Structure in Karst (Case Study: HPP Pirot, Southeastern Serbia)" in Water, MDPI AG (2019). https://doi.org/10.3390/w11030603
-
Određivanje sadržaja kiselih funkcionalnih grupa na površini biougljeva primenom Boehm-ovih titracija
Aleksandar D. Krstić, Aleksandar Đ. Lolić, Marija A. Ilić, Aleksandar M. Mijatović, Snežana J. Zlatanović, Zoran P. Nedić, Vesna M. Pavelkić (2015)Biougalj se dobija pirolizom iz organskog otpada. Smatra se ,,modifikatorom'' zemljišta i koristi se kao đubrivo i kao rezervoar za skladištenje ugljenika. Kvantifikacija funkcionalih grupa je važna zbog hemijske reaktivnosti biougljeva koji imaju uticaj na svojstva zemljišta. U istraživanju su korišćena 3 uzorka biouglja različitog porekla i jedan referentni, aktivni ugalj. Sadržaj kiselih funkcionalnih grupa je određivan titracijom po Boehm-u na dva načina: uvođenje N2 tokom titracije i tretman sa BaCl2. Optimizovan je način pripreme tri Boehm ova rastvora ...... Rivka B. Fidel, David A. Laird, Michael L. Thompson, Journal of Environmental Quality 42 (2013) 1771-1778 ...
... Belgrade, Serbia *Faculty of Mining and Geology, University of Belgrade, Djusina 7, Belgrade; **Institute of general and physical chemistry, Studentski trg 12-16, Belgrade; ***Faculty of Physical chemistry, University of Belgrade, Studentski trg 12-16, Belgrade ‘“***Institute of Chemistry, Technology ...
... the pyrolisis of organic waste. Biochar is a soil modifier due to its fertilizing effect and its potential for carbon storage. Quantification of functional groups is interesting because chemical reactivity of biochar can have effect on soil properties. In this researh different samples of biochar are ...Aleksandar D. Krstić, Aleksandar Đ. Lolić, Marija A. Ilić, Aleksandar M. Mijatović, Snežana J. Zlatanović, Zoran P. Nedić, Vesna M. Pavelkić. "Određivanje sadržaja kiselih funkcionalnih grupa na površini biougljeva primenom Boehm-ovih titracija" in 52. savetovanja Srpskog hemijskog društva, Srpsko hemijsko društvo (2015)
-
A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)
Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenikaGordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević. "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)" in Marine and Petroleum Geology, Elsevier BV (2021). https://doi.org/10.1016/j.marpetgeo.2021.105383
-
Development Of The Serbian Geological Resources Portal
... enables zooming in real-time, without loss of image quality. Multimedia part of the web portal The part of the web portal pertaining to geoheritage and geodiversity of North-Western Serbia represents the Adriatic geotectonic unit through different cycles of geological history, in the time span between ...
... Projects funded by MEMSP. FMG: Geological bibliography of the Republic of Serbia the ranking of search results, based of the number of appearances of a key word or phrase, and the sum of weigh factors of the search field. Namely, a number of entities and their attributes within the database corre- ...
... visualization of geologi- cal data. The development and implementation of GeolISS is managed by a team from the Faculty of Mining and Geology at the University of Belgrade (FMG) and funded by the Ministry of the Environment, Mining and Spatial Planning (MEMSP). The main goal of the implementation of GeolISS ...Ranka Stanković, Jelena Prodanović, Olivera Kitanović, Velizar Nikolić. "Development Of The Serbian Geological Resources Portal" in Proceedings of the 17th Meeting of the Association of European Geological Societies, Belgrade, Serbia : The Serbian Geological Society (2011)
-
Razvoj integralnog modela za optimizaciju diskontinualnog sistema proizvodnje na površinskim kopovima nemetala
Miodrag Čelebić (2024)Izbor optimalne mehanizacije u diskontinualnom sistemu transporta je jedna od najvažnijih odluka koju treba donijeti prilikom projektovanja površinskih kopova. Pri izboru optimalne mehanizacije, uticaj ima veliki broj faktora, kako prirodnih – geoloških i ekoloških, tako i tehničkih, ekonomskih i socijanih. Neki od njih se mogu izraziti numerički, u određenim mijernim jedinicama, a neki opisno, lingvističkim varijablama, shodno uslovima koji vladaju na rudnim ležištima, a koje karakterišu visok stepen neizvjesnosti i neodređenosti kako prilikom istraživanja, tako i tokom procesa eksploatacije ...izbor mehanizacije, tehnologija eksploatacije, diskontinualani sistem, ekspertsko odlučivanje, lingvističke varijable, MCDM, FAHPMiodrag Čelebić. Razvoj integralnog modela za optimizaciju diskontinualnog sistema proizvodnje na površinskim kopovima nemetala, Beograd : [M. Čelebić], 2024
-
Advantages and challenges in presenting mathematical content using EDX platform
... 1) Improvement of the quality of learning materials through peer review processes and use of modern technology. 2) Innovation in the teaching process, openness and availability with low costs. 3) Short periods for publishing learning material, while serving the needs of particular student ...
... “2009 world conference on higher education: The new dynamics of higher education and research for societal change and development e Communique”. July, 2009. [2] Margaryan, A., Bianco, M., & Littlejohn, A. “Instructional quality of massive open online courses (MOOCs)”. Computers & Education ...
... PLATFORM MARIJA RADOJIČIĆ University of Belgrade, Faculty of Mining and Geology, marija.radojicic@rgf.bg.ac.rs IVAN OBRADOVIĆ University of Belgrade, Faculty of Mining and Geology, ivan.obradovic@rgf.bg.ac.rs RANKA STANKOVIĆ University of Belgrade, Faculty of Mining and Geology, ranka.stankovic@rgf ...Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone. "Advantages and challenges in presenting mathematical content using EDX platform" in The Seventh International Conference on e-Learning (eLearning-2016), Belgrade : Metropolitan University (2016)
-
Arhitektonsko-građevinski kamen Crne Gore, stanje i potencijali
Darko Božović, Vladimir Simić (2023)Darko Božović, Vladimir Simić. "Arhitektonsko-građevinski kamen Crne Gore, stanje i potencijali" in Geološki glasnik (2023)
-
Formative evaluation of e-learning projects with the logical framework approach
... allocation of resources [7] (Bowen, 1996). Characteristics of the project are: complex accomplishment, uniqueness of the output, limited duration, clear and agreed goal, continuous process of planning and control of different resources, interdependent constraints of time-cost-quality [8][9]. ...
... defined as "the use of new multimedia technologies and the Internet to improve the quality of learning by facilitating access to resources and services, as well as remote exchange and collaboration” [16]. A value- oriented definition of E-learning, sees it as a broad combination of processes, contents ...
... reach of explanatory power. The function of the evaluation model is to make clearer the system and allows for more explicit analysis of the project through analysis of the components of the system, which is the promise of a ‘‘white box’’ approach. Furthermore, this type of analysis of the inner ...Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković. "Formative evaluation of e-learning projects with the logical framework approach" in The Sixth International Conference on e-Learning (eLearning-2015), September 2015, Belgrade, Serbia, Belgrade Metropolitan Univesity (2015)
-
Development of integrated fuzzy model for mine management optimization
Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)... the town of Jajce to the north. The longer axis of deposit L-29C rends west-to-east (140 m), and the shorter axis is perpendicular (15 m 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 ...
... 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. ZADEH L. A. (1975) The concept of a linguistic variable and its application to pproximate ...
... deposit L-29C of the Bešpelj mine near Jajce in the Republic of Serbia, Bosnia and Herzegovina, which is the focus of the paper. Study area and geology. The Bešpelj bauxite mine is located on a spacious karst plateau, on the right bank of the Vrbas River. It is at a beeline distance of 10 km from ...Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić. "Development of integrated fuzzy model for mine management optimization" in Comptes rendus de l'Académie Bulgare des Sciences (2023)
-
Fuzzy expert analysis of the severity of mining machinery failure
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 ...Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković. "Fuzzy expert analysis of the severity of mining machinery failure" in Applied Soft Computing, Elsevier BV (2020). https://doi.org/10.1016/j.asoc.2020.106459
-
Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite
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 ...... the first study of four shards provided by the Corsican Archaeological Office (DRAC). 2. Materials and Methods 2.1. Pottery Shards The four shards have been selected for the variability of their color from a series of samples collected by Corsican scholars in the northeast of Corsica during ...
... (white 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 ...
... on of blue and white asbestos in these archaeological potteries indicates that a selection of the best quality available has been made by the potter to optimize the mechanical behavior of the cooking wares. Important differences are observed in the Raman signature recorded in many places of the ...Philippe Colomban, Aleksandar Kremenović. "Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite" in Materials, MDPI AG (2020). https://doi.org/10.3390/ma13163597
-
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. "Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024" in Podzemni radovi, Beograd, jun 2024, Centre for Evaluation in Education and Science (CEON/CEES) (2024). https://doi.org/10.5937/podrad2444071B
-
2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem
... the highest quality of wood (Official Gazette of the Republic of Serbia, 1994). 2D geoelectrical resistivity tomography … 69 Table 1 Basic information about the cadaster parcels on the investigated terrain (Republic Geodetic Authority, 2019) Parcel Number Owner/User Way of Land Use Type ...
... (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) Microplastics in the marine ...
... establishment of one unique resistivity scale and observing the profile line as a whole would produce the loss of model features. Because of the overwhelming heterogeneity of the subsurface it was strived to maintain the maximal amount of details of 2D models, and because of that units of the same ...Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov. "2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem" in Podzemni radovi, Centre for Evaluation in Education and Science (CEON/CEES) (2019). https://doi.org/10.5937/PodRad1934059S
-
Improvement of geodatabase queries within GeolISS
Ranka Stanković (2008)... section 3 presents GeolISS search functionalities. Efficient 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 ...
... 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 expansion of the query, very important in ...
... framework of GeolISS implementation is based on five packages of classes: concept, observation, spatial entity, description and metadata [6]. Concept represents the core of GeolISS, and it is implemented as an aggregation of geological vocabularies, collections of terms and text definitions of things ...Ranka Stanković. "Improvement of geodatabase queries within GeolISS" in Review of the National Center for Digitization, Beograd : Faculty of Mathematics, Belgrade (2008)