Претрага
4782 items
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Oдређивање броја камиона за транспорт руде на површинском копу Шупља стијена
Грујичић Стефан (2024)Транспорт на површинским коповима се одвија паралелнпо са осталим процесима екаплоатације. Како не би долазило до непредвиђениих трошкова, потребно је усагласити све системе производње. Димензионисање адекватног транспортног система обезбеђује максималну продуктивност механизације и профитабилну експлоатацију. Чињеница да трошкови транспорта заузимају знатан део укупних трошкова иде у прилог томе да је одређивање потребног броја камиона за превоз откопаног материјала од великог значаја. У овом раду извршен је прорачун броја камиона потребног за транспорт руде од откопних етажа до дробилице на ...... 24m" - Težina praznog vozila . 31,6t Zapremina sanduka (2:1, S4E) Cnuka 5.1. KaMuon Komatsu HD 325-5 49 Pos|| A30D A 10 297 M, 4954 % 6002 B b 339 [0} 3428 C, 3318 (85 1 768 (Sž) 3834 D 2764 E 1210 F 4175 G 1 670 H 1 688 || 608 J 2 856 K 2181 L 686 M 6592 N 8105 ...
... I'O 190 Z ' s n p n / u t u dđego.L/ eH e q e M a h oMadg 8 8 0 % 1 E EVcC'ACV T19C'?05 S č A c / 0 9 T T D T I Z E 6 0 9 % 9 1 Y CuO) \Le.LHHUHCH HHm1HHITPD,] /'00 1 I L9LL [ 1 JEh WUHIfEd UU „Lo,LMIELUE}{ k A 433 [:}43 'UO} 150BHHJOH tEHh920d]I ...
... CcCTpyKTyp2a), ""Pypbene Bojte", "IIaJjbeBHHe" H "PHOHHK" (cmKa 2.1.). 14 Istražno-eksploataciono polje - - 1, Ležište "Šuplja Stijena" – | [. •žište "Đurđeve vode" [. •žište "Paljevine" [C-1«..•žište 'Ribnik" Cnuka 2.1 Tonoopaqixcka kapma noopyuja Pyonuka „IHynea Cmujena“ ca p / jpyuja Ty |y |} ...Грујичић Стефан. Oдређивање броја камиона за транспорт руде на површинском копу Шупља стијена, 2024
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Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining
... which he gave the relationship: fpr = σc/10 (MPa) (1) Protodjakonow classifies the rocks and soils into ten categories, as shown in Table 1. Bucket-wheel excavators can excavate the soil categories VI to X. Minerals 2021, 11, 564 6 of 17 Table 1. Protodjakonow classification of the rocks and soils ...
... underwater mining; coal 1. Introduction Continuous mining systems, including bucket-wheel excavators (BWE) and bucket- wheel dredges (BWD), have been used in high-volume mining operations for decades. These excavators offer some advantages as compared to the standard mining equipment [1]. The excavator design ...
... underwater mining; coal 1. Introduction Continuous mining systems, including bucket-wheel excavators (BWE) and bucket- wheel dredges (BWD), have been used in high-volume mining operations for decades. These excavators offer some advantages as compared to the standard mining equipment [1]. The excavator design ...Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić. "Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining" in Minerals, MDPI AG (2021). https://doi.org/10.3390/min11060564
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Hibridni sistem za planiranje i analizu ventilacije rudnika
... 2 1 21 r r lnb , (6.27) odakle je: θ−θ= 2 1 21 r r ln b . (6.28) Vrednost konstante D definišemo iz izraza (6.25), ili )rln(bC 11 −θ= , (6.29) Zamenom izraza za b i C u jednačini (6.24) dobija se: )rln()rln(b 11 θ+=θ , (6.30) odnosno, 1 1 1 1 21 1 1 r r ...
... fluida, ponesen brzinom poprečnog kretanja yv′ , stupa u ravan (npr. 1-1) brzinom koju je imao na mestu odakle dolazi, tako da razlika između te brzine i prosečne brzine xv u 1-1 određuje odstupanje xv ′ . Ako je y rastojanje sloja 1-1 od mesta odakle delić dolazi, onda se u prvom približavanju može ...
... Korak 1. Neka je nii ∆Q∆Q = za i = 1, 2, ...nz. Korak 2. Usvojimo početnu vrednost iQ∆ za i = n+1, n+2, ... m. Korak 3. Neka je 0∆Qi = za j = 1, 2 ... no. Korak 4. Računati ∑ = ∆= m 1i iijj QbQ za j = 1, 2 ... no. Korak 5. Preći na izvršavanje procedure metode Hardi Krosa za i = nz+1, nz+2 ...Nikola Lilić, Ranka Stanković, Ivan Obradović. Hibridni sistem za planiranje i analizu ventilacije rudnika, Rudarsko-geološki fakultet, Univerzitet u Beogradu, 2000
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Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)
Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović. "Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)" in Physics and Chemistry of Minerals, Springer Science and Business Media LLC (2014). https://doi.org/10.1007/s00269-014-0693-x
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KINDRA project – knowledge inventory for hydrogeology research
Vesna Ristić Vakanjac, Zoran Stevanović, Bojan Hajdin, Marina Čokorilo Ilić, Veljko Marinović (2017)Vesna Ristić Vakanjac, Zoran Stevanović, Bojan Hajdin, Marina Čokorilo Ilić, Veljko Marinović. "KINDRA project – knowledge inventory for hydrogeology research" in Proceedings of the national conference with international participation „Geosciences 2017“, Sofia, Bulgaria, 07-08 December, 2017, Sofia : Bulgarian Geological Society (2017)
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Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field
Most of the wells in the oilfield Turija are operating with sucker rod pumps, where casing pressure at around 15 bar, and with marginal production rates. The high value of casing pressure indicates high pressure on the face of the formation and depends directly on well productivity. In addition, with increasing value of the casing pressure gas column in the annulus is moving the dynamic fluid level near pump intake and more gas is entering the pump, it results ...beam gas compressor, BGC, increase productivity, sucker rod pump, SRP, mature field, artificial lift, production optimisationBojan Martinović, Dušan Danilović, Branko Grubač, Robert Fadiga. "Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field" in International Journal of Oil Gas and Coal Technology (2022)
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Rudna mikroskopija
Aleksandar Pačevski (2018)Aleksandar Pačevski. Rudna mikroskopija, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet, 2018
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Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4
Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan (2022)In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–gel treatment, thermolysis is faster, more efficient ...Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan. "Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4 " in XIV Conference of chemists, technologists and environmentalists of Republic of Srpska, Academy of sciences and arts of the Republic of Srpska, Banja Luka, Republic of Srpska, B&H, October 21st-22nd, 2022, University in Banjaluka, Faculty of Technology (2022)
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Assessment of river sediment quality according to the eu water framework directive in large river fluvial conditions. A case study in the lower Danube river basin
Atanas Hikov, Anca-Marina Vîjdea, Irena Peytcheva, Gyozo Jordan, Prvoslav Marjanović, Zlatka Milakovska, Petyo Filipov, Milena Vetseva, Albert Baltres, Veronica Elena Alexe, Lidia-Lenuța Bălan, Marko Marjanović, Vladica Cvetković, Kristina Šarić & The Simona Project Team (2023)Monitoring, uzorkovanje, hazardne supstance, teški metali, organske supstance, geološka osnova, standard kvaliteta životne sredine (EQS), basen reke DunavAtanas Hikov, Anca-Marina Vîjdea, Irena Peytcheva, Gyozo Jordan, Prvoslav Marjanović, Zlatka Milakovska, Petyo Filipov, Milena Vetseva, Albert Baltres, Veronica Elena Alexe, Lidia-Lenuța Bălan, Marko Marjanović, Vladica Cvetković, Kristina Šarić & The Simona Project Team. "Assessment of river sediment quality according to the eu water framework directive in large river fluvial conditions. A case study in the lower Danube river basin" in Carpathian Journal of Earth and Environmental Sciences (2023). https://doi.org/10.26471/cjees/2023/018/251
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Веб-алат за управљање грађом Речника САНУ и анотација листића
Грађа на основу које се израђује Речник српскохрватског књижевног и народног језика САНУ, а која садржи материјал из преко 4.500 писаних извора и 300 рукописних збирки речи са подручја народних говора штокавског наречја, забележена је на око 5.000.000 листића. Богат лексички материјал, који обухвата књижевни и народни језик у протекла два века и на основу кога треба да се напише још најмање 15 томова Речника, пружа могућност и за разноврсна лингвистичка и ванлингвистичка истраживања. Из тог разлога се приступило ...Рада Стијовић, Ранка Станковић, Михаило Шкорић. "Веб-алат за управљање грађом Речника САНУ и анотација листића" in Rasprave Instituta za hrvatski jezik i jezikoslovlje, Institute of Croatian Language and Linguistics (2020). https://doi.org/10.31724/rihjj.46.2.32
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Parallel Bidirectionally Pretrained Taggers as Feature Generators
In a setting where multiple automatic annotation approaches coexist and advance separately but none completely solve a specific problem, the key might be in their combination and integration. This paper outlines a scalable architecture for Part-of-Speech tagging using multiple standalone annotation systems as feature generators for a stacked classifier. It also explores automatic resource expansion via dataset augmentation and bidirectional training in order to increase the number of taggers and to maximize the impact of the composite system, which ...Ranka Stanković, Mihailo Škorić, Branislava Šandrih Todorović. "Parallel Bidirectionally Pretrained Taggers as Feature Generators" in Applied Sciences, MDPI AG (2022). https://doi.org/10.3390/app12105028
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Analogue modelling of strain partitioning along a curved strike-slip fault system during backarc-convex orocline formation: Implications for the Cerna-Timok fault system of the Carpatho-Balkanides
Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)... n. 4.1. Reference model: model 1 Model 1 consists of a rigid indenter with rounded corners, while the surrounding, deformable material is entirely brittle (Table 1, Fig. 2a, e). Deformation results only from northward translation of the model layers. Model 1 (Fig. 3) documents the development ...
... (structure 1 in Fig. 3a). However, a new strike-slip fault zone forms Fig. 3. Model 1 - reference model. Dashed black lines mark the upper and lower edges of the indenter. R – Riedel shear. a) Interpreted top-view photo after 1 cm of northward translation. b) Cumulative strain type map after 1 cm of northward ...
... different models (Table 1). Similar to experiments with no rotation, the total northward displacement of the moving plate along the western margin of the rigid block is 9 cm (Fig. 2c). The experiments presented in this study are subdivided in two groups. Group 1 (models 1–6) consists of experiments ...Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović. "Analogue modelling of strain partitioning along a curved strike-slip fault system during backarc-convex orocline formation: Implications for the Cerna-Timok fault system of the Carpatho-Balkanides" in Journal of Structural Geology, Elsevier BV (2021). https://doi.org/10.1016/j.jsg.2021.104386
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Coupling of artificial intelligence methods in the development of hybrid intelligent systems
In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije... can be classified accordingly, on basis of their functionality, processing architecture and communication needs (fig.1). Function-replacing Intercommunicating Polymorphic Fig.1 Three proposed hybrid classes Hybrid systems belonging to the first class are associated with particular methods: ...
... systems. Key words: hybrid intelligent systems, coupled systems, artificial intelligence methods, mining applications of artificial intelligence 1. Introduction AI methods and techniques, such as experts systems, case-base reasoning, machine learning, neural networks or genetic algorithms have ...
... only a particular class of problems. Complex problems often cannot be solved by any of the existing AI methods alone. Hybrid intelligent systems [1] are an attempt to solve these complex problems by coupling two or more AI methods, but also by integrating AI methods and conventional computer systems ...Ranka Stanković, Ivan Obradović, Nikola Lilić. "Coupling of artificial intelligence methods in the development of hybrid intelligent systems" in X Kongres Matematičara, Matematički fakultet, Beograd (2001)
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Model za optimizaciju graničnog saržaja metala u rudi u funkciji dugoročnog planiranja površinskih kopova
Daniel P. Kržanović (2016-06-14)Optimizacija graničnog sadržaja metala u rudi jedan je od osnovnih koraka u planiranju i dizajniranju površinskih kopova i ima za cilj postizanje maksimalne neto sadašnje vrednosti (NPV). Iz tog razloga, optimizacija graničnog sadržaja i danas je predmet mnogih istraživanja u rudarskoj nauci, sa ciljem rešavanja praktičnih problema u eksploataciji ležišta.Dugoročno planiranje eksploatacije na površinskim kopovima podrazumeva sagledavanje svih relevantih parametara i faktora (geologije rudnog ležišta, tehnologije proizvodnog procesa, kapaciteta otkopavanja i prerade, troškova, cena metala, iskorišćenja i dr) kako ...površinski kop, dugoročno planiranje, optimizacija graničnog sadržaja, maksimizacija neto sadašnje vrednosti (NPV).... (Normalizacija) Normalizuje se stablo T`i. Ovo daje stablo Ti+1. Identifikuje se skup Yi+1 jakih čvorova stabla Ti+1. Podesi se i+1= i, i prelazi se na korak 2. Treba napomenuti da je (3.12) Normalizovano stablo Ti+1 dobija se kretanjem duž jedinstvene (xm, x0) -putanje i kada ...
... minerala 1 i L kategorije sadržaja minerala 2, postoje t tona materijala. U principu, ako je kategorija sadržaja [g1(k), g1(k +1)] minerala 1 predstavljena kao k*, onda se niži sadržaj u k*, g1(k) smatra graničnim sadržajem minerala 1. Shodno tome, ako je kategorija sadržaja [g2(l), g2(l +1)] minerala ...
... sadržaja ležišta k` tj, [g(k), g(k+1)] i maksimalna vrednost gc postoji u drugoj (višoj) kategoriji sadržaja ležišta k'', tada H=k’’-k’+1 predstavlja broj kategorija sadržaja u rudnim zalihama, uključujući [g(1), g(2)], [g(2), g(3)], ..., [g(H-1), g(H)]. Očigledno, g(1)=gl i g(H)=gc na krivi sadržaj-tonaža ...Daniel P. Kržanović. "Model za optimizaciju graničnog saržaja metala u rudi u funkciji dugoročnog planiranja površinskih kopova" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-06-14)
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Vebran Web Services for Corpus Query Expansion
Ranka Stanković, Miloš Utvić (2020)U ovom radu se govori o razvoju veb usluga Vebran i njihovoj primeni u poboljšanju pretraživanja korpusa. Veb-servisi Vebran koriste se za konsultovanje spoljnih leksičkih izvora za srpski jezik (uglavnom elektronski morfološki rečnici i srpski Vordnet) i proširivanje korisničkih upita radi dobijanja relevantnijih rezultata iz srpskih korpusa.... Wordnet”. Romanian Journal of Information Science and Technology Vol. 7, no. 1–2 (2004): 147–161 Paumier, Sébastien. Unitex 3.1 User Manual, 2016, accessed August 1, 2019. http://releases.unitexgramlab.org/3.1/man/Unitex-GramLab-3. 1-usermanual-en.pdf Rizov, Borislav and Tsvetana Dimitrova. “Hydra for Web: ...
... category values: s-singular, p-plural, 1..7 — case restrictions, etc. fleksije false indicator whether the result contains only lemmas X or their inflectional forms as well (true, false) dlfByLemma false indicator of output format (forms grouped by lemma or not) Table 1. Parameters for morphological expansion ...
... of Belgrade Faculty of Mining and Geology Miloš Utvić milos.utvic@fil.bg.ac.rs University of Belgrade Faculty of Philology Belgrade, Serbia 1 Introduction It is generally known that users typically formulate very short instead of long and complex queries. The lemmatization of corpora enables ...Ranka Stanković, Miloš Utvić. "Vebran Web Services for Corpus Query Expansion" in Infotheca, Faculty of Philology, University of Belgrade (2020). https://doi.org/10.18485/infotheca.2019.19.2.5
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Application of Expansive Mortars for the Formation of Artificial Screens During Blasting in Urban Areas
During construction of buildings in urban areas, sometimes there is a need to blast solid rock mass in the immediate vicinity of the surrounding buildings. In that case, the aim is not only to increase the efficiency of blasting, but also to reduce harmful effects of ground vibration induced by blasting. At the same time, it is very important to protect the buildings located in the safe zone from the blast site as well as remaining rock mass around ...Milanka Negovanović, Lazar Kričak, Stefan Milanović, Nikola Simić, Jelena Majstorović. "Application of Expansive Mortars for the Formation of Artificial Screens During Blasting in Urban Areas" in 31st International Conference Ecological Truth & Environmental Research-EcoTER'24, Sokobanja, 18-21. jun 2024, Bor : Tehnički fakultet u Boru (2024)
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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... Živković marija.zivkovic@rgf.bg.ac.rs 1 University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia http://orcid.org/0000-0003-2659-0662 http://crossmark.crossref.org/dialog/?doi=10.1007/s10098-021-02063-6&domain=pdf M. Živković, D. Ivezić 1 3 Graphic Abstract Keywords Sewage wastewater ...
... effects of utilizing wastewater heat can be evaluated. Fig. 1 Methodology for evaluation of effects of full recoverable wastewater heat energy potential utilization in district heating systems with heat pumps M. Živković, D. Ivezić 1 3 Key performance indicators For the evaluation, comparison ...
... values of key performance indicators of the current state of the district heating systems are given in Table 1. Utilizing sewage wastewater heat in district heating systems in Serbia: effects on… 1 3 High values of the primary energy factor (1.52) and the carbon dioxide emission coefficient (328.3 kg/MWh) ...Marija Živković, Dejan Ivezić. "Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability" in Clean Technologies and Environmental Policy, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10098-021-02063-6
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Paleomagnetic evidence for post-collisional Miocene clockwise rotation in the Serbian segment of the Vardar Zone and the Danubicum
Vesna Lesić, Emő Márton, Vesna Cvetkov, Dragana Tomić. "Paleomagnetic evidence for post-collisional Miocene clockwise rotation in the Serbian segment of the Vardar Zone and the Danubicum" in 26th IUGG General Assembly Prague, Czech Republic, International Union of Geodesy and Geophysics (2015)
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Prilog poznavanju režima i bilansa voda reke Resave
Sliv Resave zauzima područje između reke Velike Morave i obronaka Kučajsko-beljaničkih planina. Sliv i režim ove reke kontroliše se dvema hidrološkim stanicama: Manastir Manasija (slivno područje u iznosu od 388 km2) i Svilajnac (681 km2). Za potrebe analize režima voda reke Resave i uticaja padavina na formiranje oticaja sa njenog sliva preuzeti su podaci o padavinama sa meteorološke stanice Crni Vrh (1037 m nm) koji odslikava režim gornjeg dela sliva ove reke, i meteorološke stanice Smederevska ...Marina Mitrašinović, Vesna Ristić Vakanjac, Saša Milanović, Ljiljana Vasić, Dušan Polomčić. "Prilog poznavanju režima i bilansa voda reke Resave" in Zbornik radova XVI Srpski hidrogeološki simpozijum sa međunarodnim učešćem, Zlatibor, 2022., Univerzitet u Beogradu, Rudarsko-geološki fakultet (2022)
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An aproach to Implementation of blended learning in a university setting
... Faculty of Mining and Geology (FMG) - University of Belgrade, as complementary to traditional face-to-face instruction 1 1 The research outlined in this paper was supported by the Serbian Ministry of Education and Science grant #III47003. ...
... who are course administrators. Thus, for example, Figure 2 shows the number of accesses to FMG Moodle platform per month, from October 1, 2010 to August 1, 2011, by the following user categories: administrators, lecturers and students. Figure 2: Statistics of access to Moodle server ...
... concurrent view of activities for several courses. Figure 3 depicts the 10 most visited courses on the FMG Moodle platform from October 1, 2010 to August 1, 2011. The process of creating and populating a course is in general complex and time consuming, which makes course backup extremely ...Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović . "An aproach to Implementation of blended learning in a university setting" in Proceedings of the Second International Conference on e-Learning, eLearning 2011, September 2011, Belgrade, Serbia, Belgrade : Belgrade Metropolitan University (2011)