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337 items

  • 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 (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria

    Vladimir Krivošić, Luka Crnogorac, Rade Tokalić (2024)
    The choice of adequate mining machines is one of the most complex problems in the underground exploitation of mineral raw materials. The weight of such a decision is reflected in the high prices of these machines and the occurrence of even greater costs during their use if their choice was wrongly conceived. There are numerous examples from practice in which such decisions were made solely on the basis of comparing the prices of machines, without considering any of the ...
    utovarno-transportna mehanizacija, izbor, TOPSIS, entropija, standardna devijacija, težina kriterijuma

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje

  • Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević (2019)
    Изингов модел, критично понашање, танки системи

  • Sastav i teksture minerala FeO-Fe2O3-TiO2 sistema u vulkanskim stenama i porfirskim ležištima bakra Borske metalogenetske zone

    Aleksandar Luković (2021)
    Proces obrazovanja minerala iz sistema FeO-Fe2O3-TiO2 u uzorcima vulkanskih stena i porfirskih orudnjenja borske zone prikazan kroz pojavu magnetita/hematita i njihovih alteracija. Minerali ove zone su ispitivani optičkim metodama (odbijena i propuštena svetlost), SEM-EDS/BSD, XRPD, LA-ICP-MS metodama. Rezultati ispitivanja su, pored glavnih Fe – Ti oksida, otkrili prisustvo ferijskog ilmenita u hornblenda andezitima I vulkanske faze kao i magnetita sa većim koncetracija Cr u zoni zlotske magnetne anomalije. Ispitivanje uzoraka iz bušotina porfirskih sistema borske zone otkriva postojanje nekoliko ...
    magnetit, hematit, hemoilmenit, Borska metalogenetska zona, porfirska ležišta
    ... , (1998): Cretaceous to Cenozoic thermal evolution of the southwestern South Carpathians: evidence from fission-track thermochronology. Tectonophysics, 297, 229-249. 89 Bosi, F., Halenius, U., & Skogby, H., (2009): Crystal chemistry of the magnetite-ulvospinel series. American Mineralogist ...
    ... Lindsley, D.H., & Andersen, D.J., (1988): Fe-Ti oxide-silicate equilibria: assemblages with fayalitic olivine. American Mineralogist, 73, 727-740. Fujino, K., (1974): Cation distribution and local variation of site symmetry in solid solution series, Fe3O4-Fe2TiO4. Mineralogical Journal, 7, 472–488 ...
    ... suprotnom spoljašnjem polju. Time se stvara efekat sila odbijanja. Samorodni bizmut (najjači dijamagnetski efekat) Paramagnetizam Minerali koji imaju nesparene elektrone i koji se u dejstvom spoljašnjeg magnetnog polja delimično orijentišu u smeru polja. Nakon uklanjanja tog polja paramagnetici ...

  • Influence of Initial Treatment on the Survival and Recurrence in Patients With Differentiated Thyroid Microcarcinoma

    Jasna Mihailović, Ljubomir Stefanović, Ranka Stanković (2013)
    ... combined with local recurrence in a third patient. The median appearance time of recurrence was 30 months (range, 8 months to 8 years). The median follow-up of patients who developed recurrences was approximately 7 years (range, 4 months to 23 years). The probability of appearance of recurrences is shown in ...
    ... of PTM incidence rates in autopsy series are also observed as follows: 1% in Brazil,6 13% in Hong Kong,3 and 35.6% in Finland.7 Differentiated thyroid microcarcinoma (DTM) is usually in- dolent in nature, with mortality as low as 0.15%,8 with a range from 0.2% to 1% mortality incidence.3,9Y12 Nevertheless ...
    ... calculate time-dependent variables using statistical software SPSS version 8 (SPSS Inc, Chicago, IL). Avalue of P G 0.05 was considered to be significant. RESULTS A summary of the patients’ characteristics including demo- graphic and histological data as well as mode of initial treatment is outlined in Table ...

  • Substitution reactions of some novel sterically hindered monofunctional Pd(II) complexes

    Aleksandar Mijatović, Jovana Bogojeski, Biljana Petrović, Živadin D. Bugarčić (2011)
    Reakcije supstitucije monofunkcionalnih kompleksa [(TLtBu)PdCl]+ i [Pd(tpdm)Cl]+, gde je TLtBu = 2,6-bis[(1,3-di-terc-butilimidazolin-2-imino)metil]piridin i tpdm = terpiridindimetan, sa nukleofilima kao što su: tiourea, I−, Br−, NO2−, piridin i dimetil-sulfoksid (DMSO) proučavani su u 0,1 M vodenom rastvoru NaClO4 u prisustvu 10 mM NaCl. Reakcije su sprovedene na tri različite temperature (288, 298 i 308 K) korišćenjem tehnike zaustavljenog protoka na različitim temperaturama. Reakcije supstitucije su praćene pod uslovima pseudo prvog reda sa velikim viškom nukleofila. Dobijeni rezultati pokazuju da kompleks ...
    Materials Chemistry, Inorganic Chemistry, Physical and Theoretical Chemistry
    ... with time under pseudo-first-order conditions. All substitution reactions were studied in 0.1 M NaClO4 aqueous solution. The NaClO4 was taken because it is well known that perchlorate ions do not coordinate to Pt(II) or Pd(II) in aqueous solution [27]. To the solution was added 10 mM NaCl to prevent ...
    ... with time under pseudo-first-order conditions. All substitution reactions were studied in 0.1 M NaClO, aqueous solution. The NaClO, was taken because it is well known that perchlorate ions do not coordinate to Pt(II) or Pd(II) in aqueous solution [27]. To the solution was added 10 mM NaCl to prevent ...
    ... were studied spectrophotometrically by following the change in absorbance at suitable wavelengths as a function of time. Spectral changes were recorded over the range from 200 to 400 nm to establish a suitable wavelength at which kinetic measurements could be performed. Substitution reactions of [(TLtBu)PdCl]+ ...

  • Digital Library From A Domain Of Criminalistics As A Foundation For A Forensic Text Analysis

    Dalibor Vorkapić, Aleksandra Tomašević, Miljana Mladenović, Ranka Stanković, Nikola Vulović (2017)
    U ovom radu predstavljen je model koji omogućava prikupljanje, pripremu, opis metapodataka, upravljanje i eksploataciju, uključujući pretragu punog teksta dokumenata iz domena kriminalistike napisanih na srpskom jeziku. Predloženi pristup primenjuje se na veb portalu koji sakuplja različite tekstove nastale iz časopisa Akademije za kriminalistiku i policijske studije, Krivičnog zakona Srbije, konferencija „Tara“ i „Reiss“, kao i iz nekih doktorskih disertacija vezanih za ovu oblast istraživanje. Nakon obrade teksta, korpus koji sadrži preko 5500 stranica običnog teksta, kreiran je i ...
    Omeka, Wordnet, pretraga punog teksta, morfološka i semantička pretraga teksta, proširenje upita
    ... expansion, showing messages sent between objects or class instances, as a series of sequential steps over time. They are used to describe the workflow, message transmission and cooperation of different elements of the system to achieve a result. Figure 3 shows the interaction of the user and system ...
    ... Resources and Tools to Improve the Performance of Web Search Engines”, in Proceedings of the Sixth Interantional Conference on Language To keep development and use of the applications and resources at the same time, without frequent conversions, the strategy for the development was to support original ...
    ... the note would have to be written before the perpetrator enters the premises. Therefore, the claim is false (at the time of writing) since the kidnapper had not even encountered the child when he wrote the note. 5 Kidnappers may write statements that later end up being true, such as "your child is ...

  • Preparation of Multimedia Document “YU Rock Scene”

    Milena Obradović, Aleksandra Arsenijević, Mihailo Škorić (2017)
    SUMMARY: This study will present the preparation process of a multimedia document entitled YU ROCK SCENE in which participants were senior students of undergraduate studies of the Department of Library and Information Science at the University of Belgrade Faculty of Philology during the academic year 2014/2015, as a part of the subject Multimedia Documents. This study gives an overview of the historical development of rock and roll in the territory of the former Yugoslavia, rock scene in Yugoslav republics, ...
    multimedia document, library science, information science, rock and roll, music, Yugoslavia
    ... was difficult at the time to purchase good musical instruments at affordable prices. Still, there were tendencies for rock music as a musical genre to take roots in the territory of Montenegro, especially in Podgorica. Some movies deal with these issues, such as Momir Matović’s To ludo srce, and rock ...
    ... parties began to be formed only after the end of World War II. Some people believed at the time, under the influence of media and Infotheca Vol. 16, No. 1–2, August 2016 111 Obradović M., et. al, “YU Rock Scene”, pp. 111–127 war, that jazz was “devil’s music” causing the youth to become rebellious ...
    ... jazz persisted, which was also a result of regular listening to (jazz) music, including the world hits of the time, broadcasted by Radio Luxembourg. Still, during the 1950s, the so-called popular music had much greater presence. Due to the conflict with the Soviet Union during the Cold War, Yugoslavia ...

  • Building learning capacity by blending different sources of knowledge

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić (2016)
    ... learning object is expected to take place: school, higher education, training or other. As for typical learning time, it is the approximate time needed for an average learner to study the content of the educational resource. The interactivity level specifies the degree to which the resource can be ...
    ... opposed to the more traditional approach looking at one language at a time (Cenoz & Gorter, 2011). Specifically, providing language resources in WB languages efficiently answers one of the major criticisms of OER, namely that they are biased towards the so called "big" languages. In order to cope ...
    ... from the LOM standard. They indicate the user type the resource is intended for, the characteristics of the learning environment, estimated time frame needed to master the learning resource, and the level of its interactivity. The intended end user role field indicates the general profile of the ...

  • Polyhedral characteristics of the cosalite-type crystal structures

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)
    kristalna struktura, kozalit, poliedarske karakteristike

  • Some models for determination of parameters of the soil oscillation law during blasting operations

    Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić (2018)
    ... red (11) There is a reduced amount of explosive Qred: Qred “ 3 ? Q r (12) R—distance from the blast site to the monitoring point (m); and Q—overall amount of explosive in a mine series (kg). Energies 2016, 9, 617 4 of 15 2.2. Models of Determination of Soil Oscillation Law Parameters There ...
    ... waves, fly rock, etc. Thus, production efficiency is increased and, at the same time, construction and mining facilities, as well as the environment in the vicinity of the blast site, are protected. 2. Soil Oscillation Law To establish the correlation between the oscillation velocity and three basic parameters ...
    ... blasting in the Veliki Krivelj Open Pit were performed during blasting using half-second electric detonators. The delay time of initiation between boreholes was 0.5 s, which led to ten explosions and appropriate soil oscillation velocities. The explosive used was powdered ammonium nitrate for general ...

  • Extraction of Bilingual Terminology Using Graphs, Dictionaries and GIZA++

    Branislava Šandrih, Ranka Stanković (2020)
    U nauci, industriji i mnogim istraživačkim oblastima, terminologija se brzo razvija. Najčešće, jezik koji je „lingua franca“ za većinu ovih oblasti je engleski. Kao posledica toga, za mnoga polja termini domena su koncipirani na engleskom, a kasnije se prevode na druge jezike. U ovom radu predstavljamo pristup za automatsko izdvajanje dvojezične terminologije za englesko-srpski jezički par koji se oslanja na usaglašeni dvojezični korpus domena, ekstraktor terminologije za ciljni jezik i alat za usklađivanje delova. Ispitujemo performanse metode na domenu ...
    ekstrakcija terminologije, validacija terminologije, GIZA++, grafovi, Unitex, klasifikacija teksta
    ... English terms (Input ii) we used the English side of the dictionary LIS- dict in one series of experiments, and term extractor Eng-TE in the other, while the extraction of Serbian terms (Input iii) was done by Serb-TE. With the notation introduced in Section 3, the extraction procedure con- sists of ...
    ... using Eng-TE for extraction). II Number of aligned chunks after subsequent filtering using Serbian terms (Processing iii) : (S(term) ∼ S(align.chunk)) ∧ (T (term) ∼ T (align.chunk)) ∧ (S(align.chunk) ↔ T (align.chunk)). 11 To keep it simple, in the following notation, we refer to sets as to single repre- ...
    ... was developed by a group of authors from the National Library of Serbia.2 In this paper we refer to this tool as LIS-dict. We also tried to extract terms on the source side. For this purpose, we decided to use an open-source software tool, FlexiTerm (Spasić et al., 2013). It automatically recognises ...

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Exhumation history of the Juhor Mts. in central Serbia, the Northern Serbo–Macedonian Subunit

    Uros Stojadinovic, Hannah Pomella, Nemanja Krstekanić, Bojan Kostić, Maja Maleš, Nikola Randjelovic, Miloš Radonjić (2024)
    Northern Serbo–Macedonian Subunit, low-t thermochronology, kinematic analyses, extensional deformations

  • Hidrogeohemija prirodnih radioaktivnih elemenata u podzemnim vodama Srbije

    Marina D. Ćuk (2018-02-23)
    Osnovni cilj doktorske disertacije predstavljao je definisanje prirodnih koncentracija (engl. background values) U, Th, i K u podzemnim vodama, i definisanje hidrogeohemijskih uslova koji utiču na distribuciju navedenih elemenata u podzemnim vodama...
    prirodni radioaktivni elementi, podzemna voda, geohemijske sredine, hidrogeohemijski uslovi, neparametarska statistička analiza, logistički model, hidrohemijsko modeliranje
    ... Mandrekar JN, Mandrekar SJ, Cha SS, Furth AF. 2006. Finding optimal cutpoints for continuous covariates with binary and time-to-event outcomes. In: Technical Report Series. Division of Biostatistics, Mayo Clinic, Rochester. 176. Wright M, Stollenwerk K, Belitz K. 2014. Assessing the solubility ...
    ... Areniti 5 1.5 1.8 Se di m en ti po kr iv ač G o rn ja k o ra Z em lj in a k o ra Glinci 12 4.2 2.5 Karbonatni glinci 11.5 53 Krečnjaci 1.2 1.9 0.63 Evaporiti 0.2 0.1 Tufovi 6 3 Graniti-rioliti 15 4.5 2.75 K o n ti n en ta ln a p o d lo g a Fonoliti ...
    ... opservacija detektovanih između j-te i (j+1) granice detekcije; Bj – broj opservacija nedetektovanih i detektovanih vrednosti ispod j-te granice detekcije Kada je j = najveća granica detekcije, pej+l = 0, and Aj + Bj = n, broj nedetektovanih vrednosti ispod j-te granice detekcije se definiše kao ...

  • Towards Automatic Definition Extraction for Serbian

    Ranka Stanković, Cvetana Krstev, Rada Stijović, Mirjana Gočanin, Mihailo Škorić (2021)
    U radu su prikazani preliminarni rezultati automatske ekstrakcije kandidata za definicije rečnika iz nestrukturiranih tekstova na srpskom jeziku u cilju ubrzanja razvoja rečnika. Definicije u rečniku Srpske akademije nauka i umetnosti (SANU) korišćene su za modelovanje različitih tipova definicija (opisnih, gramatičkih, referentnih i sinonimskih) koje imaju različite sintaksičke i leksičke karakteristike. Korpus istraživanja sastoji se od 61.213 definicija imenica, koje su analizirane korišćenjem morfoloških e-rečnika i lokalnih gramatika implementiranih kao pretvarači konačnih stanja u paketu za obradu korpusa otvorenog ...
    ... pointing to a series from the highest levels of conceptual categorization, complex and simple primitives, to lower levels of hypernyms (PLACE> AREA) [WHERE], AREA > SPACE [SOMETHING THAT EXTENDS (BOUNDLESSLY) IN ALL DIRECTIONS]). They also state that this type of research could contribute to introducing ...
    ... precision and recall are improved. The lattice is a directed acyclic graph, a subclass of finite automata, aiming to preserve the main differences between different sequences, while at the same time removing redundant information. Pattern comparison is based on the use of an asterisk (wildcard *), which ...
    ... consists of highly schematized definitions that refer to other dictionary entries, e.g. pointing to a common or literary form (“see…”), or to a derived word that retained the meaning of the basic word (“diminutive of …”). These definitions are easy to model. The second group consists of “definitions” of ...

  • Classification of Terms on a Positive-Negative Feelings Polarity Scale Based on Emoticons

    Mihailo Škorić (2017)
    The goal of this paper is to draw attention to the possibility of using emoticon-riddled text on the web in language-neutral sentiment analysis. It introduces several innovations in the existing framework of research and tests their effectiveness. It also presents a software tool especially made for that purpose, explains how it builds a database with sentimental value of terms and offers the user manual. Finally, it presents a software tool that tests the new database and gives some examples ...
    data mining, information extraction, emotions, text on the web
    ... txt which contains all the default determiners and their values. At any time, determines can 76 Infotheca Vol. 17, No. 1, 2017 Scientific paper Figure 5. Settings example for extracting value from the text. be restored to default settings of the above file, or new settings can dubbed over existing ...
    ... string is added, to get string to- ken>. With this step, each message in the XML doc- ument becomes one token: ... to- ken> . – The last step is to divide the interior of each message into tokens, us- ing whitspaces. To avoid unwanted replacement ...
    ... parameter, task is reduced to deter- mination of what is positive and what is negative. With a goal of making a more cost-effective intelligent system, it would not be a good idea to ignore any available resources and that could po- tentially be useful. The main idea of this research is to use data mining methods ...

  • Towards Semantic Interoperability: Parallel Corpora as Linked Data Incorporating Named Entity Linking

    Ranka Stanković, Milica Ikonić Nešić, Olja Perisic, Mihailo Škorić, Olivera Kitanović (2024)
    U radu se prikazuju rezultati istraživanja vezanih za pripremu paralelnih korpusa, fokusirajući se na transformaciju u RDF grafove koristeći NLP Interchange Format (NIF) za lingvističku anotaciju. Pružamo pregled paralelnog korpusa koji je korišćen u ovom studijskom slučaju, kao i proces označavanja delova govora, lematizacije i prepoznavanja imenovanih entiteta (NER). Zatim opisujemo povezivanje imenovanih entiteta (NEL), konverziju podataka u RDF, i uključivanje NIF anotacija. Proizvedene NIF datoteke su evaluirane kroz istraživanje triplestore-a korišćenjem SPARQL upita. Na kraju, razmatra se povezivanje Linked ...
    paralelni korpusi, povezivanje imenovanih entiteta, prepoznavanje imenovanih entiteta, NER, NEL, povezani podaci, NIF, Vikipodaci

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...
    Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol Injection