Претрага
510 items
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Coal homogenization stockyard sizing “Tamnava – Zapad” case study
... complicated and more expensive machines, the chevron method is generally more desirable. There is no general rule defining which number of layer is considered small and which large, but in general practice up to 100 layers is considered a small number, and above that a large number of layers. The ...
... that for a range of 300 kJ/kg the number of layers should be around 50, while for an extremely small range of 200 kJ/kg more than 170. So, in general, for the entire stockyard the number of layers is around 50, however both a smaller and a larger number of layers should remain an option. By ...Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer. "Coal homogenization stockyard sizing “Tamnava – Zapad” case study" in Proceedings of 13th International Symposium Continuous Surface Mining, ISCSM 2016, / (2016)
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Approach to operational mine planning: Case study Tamnava West
... ECS systems (Bucketwheel Excavator- Conveyors-Spreader) are engaged on overburden excavation. General technological scheme of open pit Tamnava West is presented on Figure 1. Figure 1. General technological scheme of open pit Tamnava West 2.1. Developing of technological model for coal ...
... the gridding mesh size was set at 25 m x 25 m to cover all boreholes. An exceptionally large scan distance of 35,000m was selected for seam General Purpose interpolation, and for assay data Inverse Distance, power 2. A total of 25 coal sub-seam plies, 46 partings (14 sandstone and 32 clay) ...Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković. "Approach to operational mine planning: Case study Tamnava West" in Tehnika, Beograd : Savez inženjera i tehničara Srbije (2014). https://doi.org/10.5937/tehnika1406952S
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Утицај похабаности резних елемената роторног багера на ниво вибрација погона за копање
Филип Милетић (2023)У докторској дисертацији је анализиран утицај похабаности резних елемената роторног багера на потрошњу електричне енергије и ниво амплитуде вибрација погона за копање. Креиран је модел који у функцији стања резних елемената дефинише зависност разматраних физичких феномена. За развој модела примењене су једначине теорије осцилација и Ватметарска метода [1] којом се одређује потрошња електричне енергије. За верификацију модела извршена су мерења на роторном багеру SRs2000.32/5+VR ангажованом на откопавању откривке на површинском копу Тамнава–Западно поље. Обављено је пет мерења. Резни елементи су ...Филип Милетић. Утицај похабаности резних елемената роторног багера на ниво вибрација погона за копање, Београд : [Ф. Милетић], 2023
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Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels
Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković. "Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels" in SPE Journal (2023)
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Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining
Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)... hours (mh/year) 3127 2729 2639 3039 General repair (mh) 23638 18526 17389 19154 Average failures 3.42 2.64 4.98 4.34 Technical availability 0.89 0.89 0.81 0.81 Table 11. Results of the pair-wise comparison of exploitation sub-criteria: Working hours (WH), general repair (GR), average failures (AF), ...
... ability to identify and analyse the inconsistency of the decision-maker in the process of deciding on the priorities in the hierarchal structure. The general schematic display of the AHP method structure is shown in Figure 2. The goal (zero level) of the AHP method structure is at the very top. After the ...
... have been the most influential in the analysis of the prior functioning of the machines were: Average of machine-hours per ten years, work until a general repair, average number of failures per thousand working hours of machine, and technical availability. The evaluation of the average working hours ...Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović . "Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining" in Energies, MDPI (2019). https://doi.org/https://doi.org/10.3390/en12122245
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Arsenic in Tap Water of Serbia´s South Pannonian Basin and Arsenic Risk Assessment
Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)... Assessment of the Risk Incurred through Drinking Water The main source of arsenic exposure for the general population is the ingestion of drinking water with high lev- els of arsenic [25, 26]. Inorganic arsenic, which is exten- sively metabolized in humans into even more toxic methy- lated arsenicals ...
... as oxygen, chlorine, and sulfur. This combination is referred to as inorganic arsenic. Arsenic combined with carbon and hydrogen is referred to as organic arsenic. The organic forms are usually non-toxic or less toxic than the inorganic forms. The two most com- mon non-toxic forms of organic arsenic are ...
... [27]. The chronic exposure of humans through consumption of high levels of inorganic arsenic-contami- nated drinking water is associated with skin lesions, periph- eral vascular disease, hypertension, and cancers [28]. Inorganic arsenic has been determined to be a human car- cinogen based on epidemiological ...Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić. "Arsenic in Tap Water of Serbia´s South Pannonian Basin and Arsenic Risk Assessment" in Polish Journal of Environmental Studies (2012)
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Pre-failure deformation monitoring as rockfall prediction tool
... that the slope material exhibits expected detachment mechanism, which fits into the progressive failure along developing joint concept, while the general retreat of the fallen rock mass is expectedly in the upslope direction. The SSE-facing joint set (daylighting on the rock face) and E-facing set ...Miloš Marjanović, Biljana Abolmasov, Zoran Berisavljević, Marko Pejić, Petko Vranić. "Pre-failure deformation monitoring as rockfall prediction tool" in IOP Conference Series: Earth and Environmental Science, IOP Publishing (2021). https://doi.org/10.1088/1755-1315/833/1/012197
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Pokazatelji recentne tektonske aktivnosti u speleološkim objektima Dževrinske grede (istočna Srbija)
Ana Mladenović, Jelena Ćalić (2022)Sistem Timočkog raseda predstavljen je sistemom desnih transkurentnih raseda generalnog pružanja sever – jug, koji su bili aktivni u periodu oligocena i miocena u okviru Karpato-balkanskog orogena. Početak njihove aktivnosti vezuje se za rotaciju tektonskih jedinica Karpato-balkanida (Dacia Mega Unit) oko rigidne Mezijske jedinice. Aktivnost ovih transkurentnih raseda je akomodirala ovu rotaciju, pa se smatra da je kumulativno kretanje duž Timočkog raseda tokom perioda njegove aktivnosti bilo do 100 km. Usled kompleksnih tektonskih rotacija, rasedi ovog sistema doveli su ...Ana Mladenović, Jelena Ćalić. "Pokazatelji recentne tektonske aktivnosti u speleološkim objektima Dževrinske grede (istočna Srbija)" in 18. Kongres geologa Srbije "Geologija rešava probleme", Srpsko geološko društvo (2022)
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Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays
... The regulatory framework in Serbia is based on the Law on Mining and Geological Exploration from 2015 [1] and environmental law from 2004 [2]. General rules have not been changed substantially from the previous regulations [3,4], so the most important is- sues are summarized here. Within the EU ...
... occasionally, interstratified illite-smectite and smectite, were derived from sericite-chlorite schist, mica schist and metaclastic rocks. Table 1. General features of refractory and ceramic clay deposits of Serbia. K—kaolinite, I—illite, S—smectite, IS—interstratified illite-smectite. Industrial Type ...
... Figure 1. Interrelation between the origin of a mineral deposit and economic geology. 4.1. Permitting in Serbia 4.1.1. Mining Sector The general procedure for exploration and exploitation of the new mine/quarry is divided in four steps: geological exploration, approval of exploitation, approval ...Vladimir Simić, Dragana Životić, Zoran Miladinović. "Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays" in Resources, MDPI AG (2021). https://doi.org/10.3390/resources10060063
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Srbija u OneGeology Europe
Геолошки завод Србије као носилац Пројекта ОneGeologyEurope заједно са Рударско геолошким факултетом и Министарством за природне ресурсе, рударство и просторно планирање су се укључили у међународни Пројекат OneGeology Europe у мају 2013. године у већ поодмаклој фази израде Пројекта. До краја 2013. године испунили су завршене активности које треба да доведу до пуноправног укључења у Пројекат чиме је Република Србија нашла своје место на Геолошкој карти Европе 1:1М. Геолошка карта Србије 1:1М представља компилациону односно поједностављену верзију ОГК 1:500 ...... Vodeni tokovi Quatemary 0 Eartsurface deposits River plain system 4 Quarternary Holocene in general Holocen uopate 2 Quartemary Pleistocene in general Pleistocen uopste ee 3 Quarternary _Quarternary in general Kvartar uopate Quatemary | 4 Terrestrial deposits Se Cae 1241 up. ptht 1.21.34 4 Quartemary ...
... Miocene: clastites, limestones and coal uglievi 26 Miocene Miocene in general Miocen uopste Aquitanian and Lacustrine deposits COnglomeratersandstone+s' 45549 guort3 pS 1.22.13 Burdigalian itstone+coal 28 Miocene Neogene in general Neogen uopsteno 97 Minrene Cranodiorite. Granodiort Olinnrene R Platonic ...
... clays, sands and gravels aljunkovi 44 Pliocene Lower Pliocene: unconsolidated clasttes, limestones and coal kreénjaci, ugal 45 Pliocene Pliocene in general: clasites and limestones Pliocen uopste: Klas i kreénjaci 46 Miocene Miocene-Pliocene: clases, limestones and coal ugal_ Totronianand | 5 raksh deposi ...Danka Blagojević, Ranka Stanković, Petar Stejić, Velizar Nikolić. "Srbija u OneGeology Europe" in Zapisnici Srpskog geološkog društva za 2013. godinu, Beograd : Srpsko geološko društvo (2014)
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Using English Baits to Catch Serbian Multi-Word Terminology
In this paper we present the first results in bilingual terminology extraction. The hypothesis of our approach is that if for a source language domain terminology exists as well as a domain aligned corpus for a source and a target language, then it is possible to extract the terminology for a target language. Our approach relies on several resources and tools: aligned domain texts, domain terminology for a source language, a terminology extractor for a target language, and a ...aligned texts, word alignment, terminology extraction, electronic dictionaries, morphological inflection... semantically, prag- matically, and/or statistically idiosyncratic (Baldwin and Kim, 2010). MWTs are domain-specific MWEs. nominal MWEs in the Serbian general e-dictionary of MWEs has one of 13 different structures (having 2, 3 or 4 components) (Stankovic et al., 2016). Under these presuppositions we are ...
... it is possible to compile the bilingual aligned termi- nological list. 2. Related Work In recent years extraction of bilingual MWTs, and MWEs in general, from bilingual aligned corpora has been ex- ploited by many researchers. Although most of them rely on automatic word alignment they differ both in ...
... resources. (a) Serbian Wordnet (SWN) (Cvetana Krstev, 2013) that is aligned to the Princeton WordNet (PWN)9 and (b) a bilingual list con- taining general lexica with 10,551 English/Serbian entries. The production of the bilingual list of inflected forms was done in several steps: 1. First we compiled ...Cvetana Krstev, Branislava Šandrih, Ranka Stanković. "Using English Baits to Catch Serbian Multi-Word Terminology" in Proceedings of the 11th International Conference on Language Resources and Evaluation, LREC 2018, Miyazaki, Japan, May 7-12, 2018, European Language Resources Association (ELRA) (2018)
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Pannonian Basin, Pannonian Basin System and Pannonian realm - three different concepts
Dejan Radivojević (2019)... dynamic area that, in the short geological period, has passed through continental, marine, lacustrine and again continental depositional stage. In general, it can be said that the initial phase of the accommodation space formation that will later occupy the Pannonian Basin corresponds to the paleo ...Dejan Radivojević. "Pannonian Basin, Pannonian Basin System and Pannonian realm - three different concepts" in GeomorForum 2019, Landforms related to the plains of Serbia and its neighboring area, Beograd, , Društvo geomorfologa Srbije (2019)
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Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia
Maja Milošević, Bojan Kostić (2022)... Student Conference. Krakow Poland. Milošević, M., Logar, M. 2014. Smectite clays of Serbia and their application in adsorption of organic dyes. EGU General Assembly 16, EGU2014-1882-1. The 22nd Congress of the Carpathian-Balkan Geological Association (CBGA) will be held from 7 to 11 September 2022 ...Maja Milošević, Bojan Kostić. "Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia" in Abstracts XXII International Congress of the Carpathian Balkan Geological Association (CBGA), September 7–11, 2022 Plovdiv, Bulgaria, Софиа : Геологически институт „Акад. Страшимир Димитров“ (2022)
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Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment
Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)... Assessment of the Risk Incurred through Drinking Water The main source of arsenic exposure for the general population is the ingestion of drinking water with high lev- els of arsenic [25, 26]. Inorganic arsenic, which is exten- sively metabolized in humans into even more toxic methy- lated arsenicals ...
... as oxygen, chlorine, and sulfur. This combination is referred to as inorganic arsenic. Arsenic combined with carbon and hydrogen is referred to as organic arsenic. The organic forms are usually non-toxic or less toxic than the inorganic forms. The two most com- mon non-toxic forms of organic arsenic are ...
... [27]. The chronic exposure of humans through consumption of high levels of inorganic arsenic-contami- nated drinking water is associated with skin lesions, periph- eral vascular disease, hypertension, and cancers [28]. Inorganic arsenic has been determined to be a human car- cinogen based on epidemiological ...Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić. "Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment" in Polish Journal of Enivronmental Studies 21 no. 6, Olsztyn, Poland : Polish Journal of Enivronmental Studies (2012): 1783-1790
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Threshold-induced correlations in the Random Field Ising Model
... b V b b D T V ( / ; , ) ( ; , ), ( / ; , ) ( ; , ) (15) T x w T T x w T end th 1 end th ini th 1 ini th end end ini ini �e foregoing general predictions can be tested in the case of any response signal for which can be expected that the assumptions, used in their derivation, are reasonably ...
... BoA) = 6" Dep (Tints Vins )> (14) Dy, (Tonal; O° Vi» bSX) bY Dy (Tena Vins ¥)> Dy,,(TinilBs B*Vy BOX) = BY 'Dz, (Tins Vin )- (15) The foregoing general predictions can be tested in the case of any response signal for which can be expected that the assumptions, used in their derivation, are reasonably ...
... scaling predictions obtained for the previously studied crack-line propagation model30,32 also hold in the case of RFIM signals, suggesting their general validity in accordance with the scaling hypothesis and derived scaling forms proposed in the previous section. In our analysis we have also identi�ed ...Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević. "Threshold-induced correlations in the Random Field Ising Model" in Scientific Reports, Springer Science and Business Media LLC (2018). https://doi.org/10.1038/s41598-018-20759-6
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Medical Domain Document Classification via Extraction of Taxonomy Concepts from MeSH Ontology
Mihailo Škorić, Mauro Dragoni (2019)This paper is a result of a task that was presented to attendants of Keyword Search in Big Linked Data summer school, that was organized by Vienna University of Technology, under the Keystone COST action in the summer of 2017. It presents a specific approach to the classification via creation of minimal document surrogates based on the US National medical library’s MeSH ontology, which is derived from the Medical Subject Headings thesaurus. In a series of previously classified medically ...... and the second block 055 is unique among the sibling nodes (Figure 2). 1.2 Classification introduction The problem of classifying documents in general occurs in two variants: clas- sification in a well-known, restricted domain of classes, and in an unknown one. For both, the problem is reduced to ...
... the documents subject to clas- sification, resulting in two test sets. The control method was to replace the identifiers with their class, a more general hierarchical designation. The ex- perimental method also considered the length of the identifiers, so they were replaced by a certain number of iterations ...
... is necessary for each document to be assigned an identifier, so if a document does not have an identifier assigned, it is assigned one of the most general – H02.403 – which designates medicine. When a sequence of identifiers in each document is reduced to one class, it is taken as a result of the cl ...Mihailo Škorić, Mauro Dragoni. "Medical Domain Document Classification via Extraction of Taxonomy Concepts from MeSH Ontology" in Infotheca, Faculty of Philology, University of Belgrade (2019). https://doi.org/10.18485/infotheca.2019.19.1.3
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The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines
In this paper we present how resources and tools developed within the Human Language Technology Group at the University of Belgrade can be used for tuning queries before submitting them to a web search engine. We argue that the 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, such as morphological dictionaries and wordnets. These dictionaries enable semantic ...LR web services, MultiWord Expressions & Collocations, Information Extraction, Information Retrieval... seemingly resolve this problem. However, the expansion of the set of words describing a concept in a query, although contributing to the recall in general, has and adverse effect. Namely, due to the fact that many words are homonymous or polysemous, adding new words to the query might reduce precision ...
... nedelja ‘horrible week’ or ‘horrible Sunday’ are obtained as well. 2. Typical problems when retrieving documents using a web search engine 1. In general, when the concept the query relates to is lexicalized by one or more multi-word terms in a highly inflective language, the search engines are faced ...
... contains 117,000 lemmas which yields the production of approximately 1,400,000 different lexical words. More than 85,000 simple lemmas belong to general lexica, while the remaining 32,000 lemmas represent various kinds of simple proper names. The Serbian morphological dictionary of compounds contains ...Krstev Cvetana, Stanković Ranka, Vitas Duško, Obradović Ivan. "The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines" in LREC 2008: Conference on Language Resources and Evaluation, Marrakesh, Morocco, May 2008, European Language Resources Association (ELRA) (2008)
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Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”
... structures The open pit is of a deep type with 10m high levels, with 8m-10m wide bed- ding planes, the angle of inclination of slopes 55°-65° and a general end slope of 33°. Bauxite is being excavated up to the �ooring so that the stope slope is milder in the northwestern part and there are roads ...
... standard deviations for given dimensions and adopted standard deviations of dimensions to be set out, and in accordance with (1), by implementing the General Law on the Propagation of Errors (Chandra, 2005), the variance-covariance matrix for standard deviations of coordinate differences was established: ...
... deviations for measuring the instrument height and the altitude of signal of σ i = σ l = ± 0.01m. In accordance with (8), and by implementing the General Law on Propagation of Variances (Wolf & Ghilani, 1997), standard deviations for elevation differences are to be calculated as follows: 2222 2 ...Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić. "Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”" in Revista Escola de Minas, School of Mines Magazine, Sao paulo, Brasil : SciELO (2015)
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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 ...Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić. "Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945617
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Some models for determination of parameters of the soil oscillation law during blasting operations
... carried out during mass mining in the Kovilovača Open Pit near Despotovac. 4.1. Experimental Investigation in the VelikiKrivelj Open Pit 4.1.1. General Characteristics of the Work Environment in the Veliki Krivelj Open Pit In the Veliki Krivelj Open Pit we performed experimental investigations on ...
... boreholes was 0.5 s, which led to ten explosions and appropriate soil oscillation velocities. The explosive used was powdered ammonium nitrate for general purposes (Amoneks-I, manufactured by Trayal Corporation AD, Kruševac, Serbia). The holes were arranged in a single line while one cartridge of explosive ...
... carried out for the purpose of exploitation of mineral deposits. Measurements were carried out in the Kovilovača Open Pit near Despotovac. 4.2.1. General Characteristics of the Kovilovača Open Pit Kovilovača limestone deposits have an exceptionally simple geological structure. Limestone deposits of ...Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić. "Some models for determination of parameters of the soil oscillation law during blasting operations" in Energies, Basel, Switzerland : MDPI (2018). https://doi.org/10.3390/en9080617