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1482 items

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... hand, the testing wedge that is used for wedging the rock specimens has a wedge angle of 35◦ with a blunter tip of width b = 5 mm and length of l = 65 mm (Figures 7 and 8) [14,17]. σ σ σ (a) (b) Figure 7. Wedge test method: (a) the wedge and (b) wedge position while testing cutting force. This ...
    ... KL = P/L (N/cm′) (3) KA = P/A (N/cm2) (4) Minerals 2021, 11, 564 7 of 17 where: P—force (N), L—length of the specimen (cm’), and A—specimens’ cross-section area (cm2). ′ (a) (b) γ γ γ σ σ σ σ σ Figure 8. Wedge testing method (Orenstein and Koppel): (a) cylindrical (core) sample and ...
    ... diameter of the sample. A rock or soil sample is placed in a triaxial (glass or plastic) cell, in the triaxial test, with the sample being enclosed in a rubber membrane. The membrane is sealed to circular plates at the top and the bottom of the sample, with two o-ring seals ensuring a water-tight connection ...

  • Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Tina Dašić (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction
    ... Reynolds, B.; Curtis, C.J.; Crook, H.D.; Norris, D.; Brittain, S.A. A Conceptual Model of Spatially Heterogeneous Nitrogen Leaching, from a Welsh Moorland Catchment. Water 4ir Soil Pollut. 2005, 4, 97–105. [CrossRef] 10. Jones, A.L.; Smart, P.L. Spatial and temporal changes in the structure of groundwater ...
    ... located in Serbia, which consists of a strong, karst spring, a thermal karst spring, and a borehole that captures sub-thermal waters, has been studied. A phenomenon which gives rise to the occurrence of karst waters of three different temperatures within a relatively short distance (about 200 m) ...
    ... karst spring, whose temperature is stable and ranges from 10 to 12 ?"C, and, to a lesser extent, via the Krupaja thermal spring, with a constant temperature of 26 "C, in addition to discharges via an artesian borehole with a temperature of18C (Figure 1). Legend: 17 Karst aquifer Intergranular aquifer ...

  • Hypogene speleogenesis related to porphyry magmatic intrusions and its influence on subsequent karst evolution in the Peruvian high Andes

    Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre (2022)
    Earth-Surface Processes

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala
    ... sector displayed on the map will have a unique value, along with its azimuth and zenith. Figure 4 shows an example of a direct solar radiation map (also called a sun map) that can be found in the literature (Republic of Serbia, 2018). Precisely, this is a map relating to 399 North latitude for ...
    ... with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time interval. This paper presents a methodology for the application of the ASR tool for the determination of solar energy potential in urban areas. ...
    ... given space and for a specified time interval. The output is a solar map which contains information regarding the quantity of insolation/solar radiation energy for a specified area. Such solar resource calculation and mapping integrated into the SAT is developed 326 by Fu P. and Rich P.M. (in 2000) ...

  • An Italian-Serbian Sentence Aligned Parallel Literary Corpus

    Saša Moderc, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić (2023)
    This article presents the construction and relevance of an Italian-Serbian sentence-aligned parallel corpus, delving into the aligned sentences in order to facilitate effective translation between the two languages. The parallel corpus serves as a valuable resource for language experts, researchers, and language enthusiasts, fostering a deeper understanding of linguistic nuances and cultural expressions. By bridging the gap between Serbian and Italian, this corpus opens new avenues for cross-cultural communication and collaboration, and ultimately contributes to the improvement of language-related ...
    Aligned corpus, parallel corpus, Serbian, Italian, literature

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel (2016)
    General Earth and Planetary Sciences
    ... biotite from a mylonite formed under higher-greenschist facies conditions, sampled within a shear zone with a top-to-the- west sense of shear formed in the Božica magmatic com- plex, yielded a Middle Triassic plateau date (246 + 1 Ma; SM490-I; Table 1; Figs. 2, 14). Thermal evolution of a Lower ...
    ... 106:1665–—1692 Fig.7 a Cross-section EF through the Vrvi Kobila area. b Detail of the map in Fig. 2 with a trace of the cross-section EF. Location of the map relative to Fig. 3 and the Lower Complex (black silhou- ette) is indicated by a black rectangle in the inset. c Thin section of a C' shear bands ...
    ... at a moderate angle, but a significant population of subvertical cleavage striking north to north- east-south to south-west is also observed (Fig. 9b). A sin- gle axis ba moderately plunging towards the south-west of @ Springer Int J Earth Sci (Geol Rundsch) (2017) 106:1665–—1692 a large ...

  • Uticaj površinske obrade kamena na promenu primarne poroznosti

    Ana Radivojević (2024)
    Površinska obrada kamena je izuzetno bitna kod stena koje se koriste u izgradnji svih vrsta objekata. Površinskom obradom se direktno utiče, ne samo na estetska svojstva kamena nego i na njegove fizičko-mehaničke karakteristike. Cilj ovog završnog rada je analiza uticaja poliranja i rezanja kao tehnoloških procesa obrade na poroznost odabranih vrsta arhitektonsko-građevinskog kamena. Ispitivane stene su gabro „Nero Assoluto“, granit sa površinskog kopa „Ploče“, granit African Red, krečnjak sa lokaliteta „Skržut“ i krečnjak poznat pod nazivom „Sirogojno crveni“.
    polirana površinska obrada kamena, rezana površinska obrada, poroznost, kapilarno upijanje vode
    ... granita „African Red”> a 43 3.1.5. Fizička svojstva krečnjaka „Skržut” a 47 3.1.6. Fizička svojstva krečnjaka “Sirogojno crveni” ... 51 4. DISKUSIJA ... anaaaaaaaaaeaaaaa a aaakakve 56 5. ZAKLJUČAK a a aaaa iii aaaaaiaaaaakat 62 LITERATURA „aıynna a nanaanaaaaaaaaaaaaa a aaaaaaaaaNatakvt 63 ...
    ... makroskopski lako uočavaju: muskovit izgleda kao srebrna, a biotit kao crna šljokica. Amfibola ima nešto manje, a u steni je tamnozelene do crne boje. Struktura stene je zrnasta, a tekstura masivna (sl. 3.3). Slika 3.3 – Makroskopski izgled GP: a.) rezana površina; b.)polirana površina Petrografskom ...
    ... ....aaaaaaaa a nanaeaaaaaakakavi 16 2.3. Metodologija ispitivanja ....aaaaaaaaaa a naaaaaaaeaaaeaaaaataket 17 2.3.1. Optička ispitivanja . naaaataaaaaaataotot 17 2.3.2. Specifična i prividna zapreminska masa .........aaaaaaaaaannn 18 2.3.3. Otvorena i ukupna poroznost.....aaaa a anaaanaaaaaataetot ...

  • Analysis and visualization of geophysical well-logging data from closely spaced boreholes

    Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov (2024)
    Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...
    well-logging in karst, water loss, data correlation, data fusion
    ... iPhone AS A TOOL IN STRUCTURAL GEOLOGY Igor Ivanovski, Bojan Maksimov, Gose Petrov, Gorgi Dimov, Milorad Jovanovski, Natasha Nedelkovska — O a 285 Enepruja, Đocu.inu ropuBa u Jar:tepojiHa HeyTpaJIHocT CEEGS PROJECT – A NEW PERSPECTIVE FOR GREEN ENERGY Jris Puković Kartal O a 293 CHCTEM ...
    ... boreholes distributed at a close distance. The survey was carrled out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis and ...
    ... It is especially rare in boreholes at a close distance. The survey was carrled out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. In these investigations, there was a need to carry Oout exXploratory drilling:at ...

  • A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)

    Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin (2016)
    ... open-cast mine Tamnava – West Field. The software used in the research provides a portrayal of the 3D distribution of the aquifers present in the study area. As such, the hydrogeologic model constitutes a basis for developing a hydrodynamic (mathematical) model of the groundwater regime. Keywords: h ...
    ... Miocene sands, silt and clay. 3. METHODOLOGY A hydrogeologic model is an interpretation of the dynamic and physical properties of a hydrogeologic system (American Society for Testing and Materials, 2014). According to Polomčić (2001), a hydrologic system is determined by: input elements, ...
    ... model), and - initial conditions, determined by the piezometric head at a certain initial time. 48 Ratković J., Polomčić D., Bajić D., Hajdin B. A hydrogeologic model is the first step in groundwater modeling and precedes a hydrodynamic model. If the hydrogeologic model is not properly defined ...

  • NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands

    Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić (2012)
    Reakcije supstitucije monofunkcionalnog [Ru(terpi)(bipi)(H2O)]2+ kompleksa, gde je terpi = 2,2′:6′,2″-terpiridin i bipi = 2,2′-bipiridin, sa biološki relevantnim sumporo donorskim ligandima, kao što su tiourea, l-metionin, l-cistein i glutation, proučavane su u vodenim rastvorima tehnikom 1H i 13C NMR spektroskopije. Sve reakcije su proučavajne na pH 7,4, u prisustvu fosfatnog pufera, da bi se oponašalo fiziološko okruženje tokom procesa supstitucije. Reakcije se izvode na 295 K pod uslovima reakcija drugog reda. Uočeni rezultati pokazuju da brzina supstitucije snažno zavisi ...
    Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

  • The subthermal potential of karstic groundwater of Kučaj–Beljanica region in Serbia estimated by the multivariate analysis

    Ljiljana Vasić, Dragana Ž. Živojinovic, Vladana Rajaković-Ognjanović, Huang Fen, Cao Jianhua (2021)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • A comparison between ARIMA, LSTM, ARIMA-LSTM and SSA for cross-border rail freight traffic forecasting: the case of Alpine-Western Balkan Rail Freight Corridor

    Miloš Milenković, Miloš Gligorić, Nebojša Bojović, Zoran Gligorić (2023)
    železnica, prekogranični teretni saobraćaj, ARIMA, LSTM, SSA

  • Одређивање резерви нафтног лежишта „Х“ методом материјал баланса

    Александра Петровић (2024)
    Метода материјалног баланса је кључна техника у процени резерви нафте и гаса у лежиштима која омогућава системско прорачунавање доступних резерви. Циљ ове методе је да се прецизно израчунају количине флуида у лежишту на основу доступних PVT података, података о лежишту и производњи. Резултати примене методе материјалног баланса показују да је она ефикасна у пружању кавнтитативних процена, међутим њена тачност зависи од квалитета улазних података. Метода материјалног баланса пружа основу за процену резерви, али може бити подложна грешкама због непрецизности ...
    материјални баланс, прорачун, енергетски режим, притисак, аквифер
    ... EkcntaH3HOHH pe?)KHM a aaaaaaaa a e da aea a aaa a aaaaa a aaaa a aataatakavi 3 2.2. PexxHM pacrBopeHor raca 2.3. Pe>)KHM TacHč KaTIć aatynnan... 2.4. BonoHanopHH pe?KHM alynaaaaa a a dna a aaeaaaeaaa a a aaaaaaeaaaaaaaaeı & 2.5. I paBHTaLHOHH pe?KHM a a a aa a aaaaaaaaaaaaaaaa a aaaaaa a aaaaaaaaaaavt ...
    ... vt 10 2.6. KOoMOMHHOBaHH pe)KHM..aaaaaaaaaaaaaaaaaaaa a a ea a ea a aaaaaeaatatNeket 13 3. JEJHHAUMHA MATEPMJAJIHOT BAJIAHCA ......anaaaaaaanaannne 15 3.1. Vuenihe eHepreTckHx pexxXuMa HcKopHinhesha JICKHIMTA.aaaaaaaaaaaaaaaaa a 26 4. .· XABJIEH H OJIEX-OBA JEJIHAUHHA MATEPMHJAJIHOT BAJIAHCA ...
    ... We/(Eo+Er„, ) (Okotie a Ikporo, 2019) ... .35 Cnaka 4.6. F y oynaKmiju EB, (Okotie a Ikporo, 2019) ... .36 Cnuka 4.7. F/E, y oyHKnuajna We/E, (Okotie a Ikporo, 2019) ... 37 Cnuka 4.8. F y oyaKunja ER.,+E, (Okotie a Ikporo, 2019) ın 38 Cnuka 4.9. F/Eo y oyHgKnunju Ey/Eo (Okotie a Ikporo, 2019).... ...

  • Inženjerskogeološka istraživanja za potrebe izgradnje tunela T1 na putnom pravcu Požega-Kotroman

    Andrija Popović (2024)
    Tokom izrade završnog rada korišćeni su podaci koje sam dobio u saradnji sa firmom „Saobraćajni institut CIP d.o.o.“, kao i ostala odgovarajuća stručna literatura.Osnovni cilj pisanja rada jeste definisanje određenih fizičko mehaničkih parametara i predlog podgrade i načina iskopa tunela na osnovu RMR klasifikacije.
    stenska masa, RMR klasifikacija, tunel, inženjerskogeološka istraživanja
    ... aaaaaaaaaaaaeaaaaaeaaaaaaaaNett 19 4.7 MRMR klasifikacija ..aataaa a anaaaaaaaaaaaaaaaaaaaaaaaaaaeaaaaaaataatattt 19 TUNEL TI.......aaaaa n n a a aaa a aa a aaaa a aaa a aa a iaeaa tt aaktaktHt 20 5.1 Geotehnička sredina „,A“- masivni i retko bankoviti krečnjaci ........c...aaaaaadnnncnne 21 ...
    ... f\paraHa CnaBkoBuh, MacT. MHX. reOn. K O T A B E B I b M H A By BM HA El 5 T I M T O J I O L I K A O 3 H A K A T E H E T C K A T I P V I T A J I H O C T nMTORnROUKM OTMC [1 HET rn. y3. B nO P. y3 . 3 |/0 BY UE EM :A „ TK ,\ , On 92.4 no 92.7 m nykoTMHa ...
    ... ii ne a gv oM ev ai m e a m a q g v we že n a z m m e n n e p o r i e L L I L U \w po kr ar e ve cr me o m e n p e po vr šn e = — iw un :m oć ne za :b le ni h ta gm en ar a hp od ra na ve cm a iz me nj ne pov rii ne sa me ko m dl a um er ...

  • 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, FAHP

  • Introductory editorial - Special issue: Genesis and protection of groundwater in carbonate aquifer

    Saša Milanović (2019)
    Geochemistry and Petrology

  • Испитивање могућности флотирања церузитне руде из лежишта Олово - БиХ

    Славко Тодић (2024)
    Овај завршни рад заснива се на испитивању могућности флотирања церузитне руде из лежишта Олово - БиХ. У циљу свеобухватног испитивања и добијања што прецизнијих резултата, у општем делу рада представљени су географски положај и историјат, како рудника, тако и општине Олово, затим геолошка грађа подручја, минерални састав лежишта и његове структурно-текстурне карактеристике. Такође, у овом делу рада дат је и кратак увид у минералошку анализу руде из лежишта Олово, те опште карактеристике корисних минерала церузита/англезита и калцита као основне некорисне ...
    церузит, сулфидизација, флотацијска концентрација
    ... JOJpa) al naananaaaaaaaa a aaaaaataNı 25 2.7.4. “ noranjckHM peareHCH...aaaaaaaaaaaa a aaaaaaaaaa a aaaaa a aaa a aaaaNaatatet 26 2.7.4.1. KOoJIČKTOpMaaaaaa a aaaaaraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaiivt 26 2.7.4.2. . Mojgui()HKaTOPH al nananaaeaaaaaa a aaaa a aaaaa a aaataiet 27 2.7.4.3. · IleHymauM ...
    ... HaTpHJyM-CyJI(DH/a altynaaa a 52 3.2.5. . Onarg (pnrorapaba..aaaaaaaaaaa a aaaaaaaaaaa a aaaaaaaaaaaataaaatatet 54 3.25.1. Omarl 3.2.5.2. Omair2 3.2.5.3. Omar3 3.2.5.4. Omrr4 3.3. AHajng3a peyay-raTa a aenaaaaanaeaeaeeaaaaaea e a aaaaeaeaeaaaeaeaaNNe e 61 OBE LVAJN A t:1 ARARAVAVAANA ...
    ... (DoTatiHjcka KOHIIeČHTParnuja. Cajnpskaj IO BGR RAAAA RRA TAAA TA A .. . ..J.J L — ı . .RGTRTGRTrOrAAAAAOAATAATTAAATTAAAAAARRARRRRAAR 8 2. OmurrH Me adaaaaaaaaaaaaaeaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa a aaaaaae a aeaaaaagaa a aaaaaaagaa a a aaaaBeeaaeaeeeaeuBeeBee BB 39 9 2.1. TeorpadcKe oJUIHKe rpa}la ...

  • Machine Learning and Deep Neural Network-Based Lemmatization and Morphosyntactic Tagging for Serbian

    Ranka Stanković, Branislava Šandrih, Cvetana Krstev, Miloš Utvić, Mihailo Škorić (2020)
    The training of new tagger models for Serbian is primarily motivated by the enhancement of the existing tagset with the grammatical category of a gender. The harmonization of resources that were manually annotated within different projects over a long period of time was an important task, enabled by the development of tools that support partial automation. The supporting tools take into account different taggers and tagsets. This paper focuses on TreeTagger and spaCy taggers, and the annotation schema alignment ...
    Part-of-Speech tagging, lemmatization, corpus, evaluation, Serbian, morphological dictionary
    ... were added. 3ELTeC is a corpus prepared in the scope of COST Ac- tion CA16204 Distant Reading for European Literary History, https://www.distant-reading.net/. 3956 PoS-tag UPoS SMD TT11 MTE ADJ ✓ ✓ A ✓ A ✓ A ADP ✓ ✓ PREP ✓ PREP ✓ S ADV ✓ ✓ ✓ ✓ R AUX ✓ ✕ * V+Aux ✕ V ✕ * V+a CCONJ ✓ ✕ * CONJ ✕ ...
    ... lemmati- zation. spaCy (Explosion, 2019) is a commercial open-source li- brary for advanced NLP in Python. Its model for tagging is based on a DNN that is designed to predict a “super tag” 4SrpKor, http://www.korpus.matf.bg.ac.rs/ with a PoS, morphology and a dependency label (Honni- bal and Montani ...
    ... operational tagger and a lemmatization model for Serbian was produced as the parameter file TT11 for TreeTagger, a supervised ML-tagger based on Hid- den Markov Models (HMMs) that uses decision trees for smoothing (Schmid, 1999). A manually annotated train- ing corpus, a full lexicon containing ...

  • Serbian NER&Beyond: The Archaic and the Modern Intertwinned

    Branislava Šandrih Todorović, Cvetana Krstev, Ranka Stanković, Milica Ikonić Nešić (2021)
    U ovom radu predstavljamo srpski književni korpus koji se razvija pod okriljem COST Akcije „Distant Reading for European Literary History” CA16204. Koristeći ovaj korpus romana napisanih pre više od jednog veka, razvili smo i učinili javno dostupnim Sistem za prepoznavanje imenovanih entiteta (NER) obučen da prepozna 7 različitih tipova imenovanih entiteta, sa konvolucionom neuronskom mrežom (CNN), koja ima F1 rezultat od ≈91% na test skupu podataka. Ovaj model je dalje ocenjen na posebnom skupu podataka za evaluaciju. Završavamo poređenje ...
    ... developed a POS-tagger and a NER for Greek using spaCy, based on newspaper articles and Wikipedia dataset, able to recognize the following entity types: location, organization, person and fa- cility. Jabbari et al. (2020) created a corpus consisting of news articles in French, which ser- ved as a dataset ...
    ... 1) an entity is recognized, but not with the correct type (e.g. PERS mistaken for a ROLE); 2) an entity is recognized as a correct type but the scope is not correct (e.g only a first name is recognized as PERS, although a full name is given); or 3) model annotated something that is not present in the gold ...
    ... occurrences of the word otac ‘father’ as a ROLE, although it can represent both a male parent (which according to the guidelines should not be annotated) and a priest (which should be annotated). Similar is the case with čika ‘uncle’, which in Serbi- an, when used before a personal name, has the meaning of ...