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1040 items

  • FTIR Spectroscopic Study Of S-Metolachlor Sorption On Inorganic And Organically Modified Montmorillonite From Bogovina

    Lazar Kaluđerović, Zorica Tomić, Jelena Bogosavljević, Ljubomir Životić, Maja Milošević (2021)
    ... presented in this paper show the interaction of herbicide S-metolachlor with inorganic and organically modified montmorillonite from Bogovina (Boljevac municipality, Serbia). Clay sample from Bogovina represent Ca-Na montmorillonite with a small amount of quartz, cristobalite and carbonate minerals. Organic ...
    ... Organic montmorillonites were obtained after modiffication with different concentrations of organic complex (HDTMA and PTMA), whereas inorganic modification was performed with 1M NaCl solution. The interaction between minerals and herbicide was monitored using infrared spectroscopy. IR bands ...
    ... montmorillonite in comparison with the spectrum of inorganically modified montmorillonite. The wavenumber, intensity and width of these bands are sensitive to conformation in hydrocarbon chains. On the other hand, after the organic modification of the montmorillonite with the PTMA complex, stretching ...

  • Using English Baits to Catch Serbian Multi-Word Terminology

    Cvetana Krstev, Branislava Šandrih, Ranka Stanković (2018)
    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
    ... 1st component inflects; 3rd and 4th are a structure 1–4 in a case that agrees with a preposition 10 AxN4x AxN4x The 1st component inflects and agrees with a structure 5. 3,160 3,082 11 AxN6x AxN6x 1st inflects and agrees with a structure 5–8 in gen/instr 1,263 1,252 12 N8x Nx(S4)g(i) 1st inflects; remaining ...
    ... matched with the Serbian part of the aligned chunk. 3. The aligned chunks from Step 1 were filtered with the additional condition T (align.chunk) ∼ T (term.extract). 2,266 chunks were obtained, 2,120 of them matching different extracted MWTs. 4. The aligned chunks from the step 2 were filtered with the ...
    ... and a target language. We will denote an entry in this corpus with S(text.align) ↔ T (text.align); • A list of terms from the same domain in a source language (both single-word terms (SWTs) and MWTs). We will denote an entry in this list with S(term.list); • A list of MWTs extracted from the target part ...

  • Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)

    Ljiljana Vasić, Saša Milanović, Anita Puskás-Preszner, Laszlo Palcsu (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    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
    ... associated with particular methods: a selected AI method is being improved by coupling with another AI method. Enhancement of the basic method usually results either in faster execution or increased reliability. For instance, a common type of NN, the back propagation NN often exhibits problems with leaving ...
    ... combination of different intelligent methods, but also their integration with conventional computer systems: database applications, spreadsheet applications, GIS environment, CAD/CAM, etc., with the ability to interchange data with different processes using different media. 3. A hybrid system for ...
    ... intelligent system is presented in section 4. This is a hybrid system with both function-replacing and intercommunicating characteristics used for the prediction of the endangerment of an area by air pollution. The paper ends with a few concluding remarks. 2. Hybrid intelligent systems The motivation ...

  • Mesozoic carbonate rocks in Serbia used as dimension stone

    Vesna Matović, Tijana Vojnović Ćalić (2016)
    The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...
    Ukrasni kamen, Mezozoik, Krečnjak, Srbija, Petrografija, Fizičko-mehanička svojstva
    ... limestone layered in thick beds with bedding planes abundant with Inoceramus (Gajić 2007). The second member, allochemical limestone, occurs rarely, mainly in the form of beds or banks, and it is characterised by the texture of turbulent transport, partic- ularly with intervals of the Bouma Sequence ...
    ... or of low porosity, of very low water absorption, hard, and with high to moderately high values of compressive strength. The scope of use is established according to a comparison of statically analysed engi- neering properties with the technical requirements neces- sary for a suitable reference ...
    ... dimension stone production are Asia (50 % of world production in 2004) and Europe (~38 %) (Montani 2005). With 11.8 Mt exported in 2008, China is the leader in stone exportation. Along with Italy, India, Spain, Brazil, and Portugal, China sold more than 1 Mt of material on the international stone ...

  • Trace elements and garnet formation in a distal skarn zone: a case study of the Rudnik deposit, Central Serbia

    Bojan Kostić, Pavle Tančić, Natalija Batoćanin (2024)
    geohemija granata, retke zemlje, fluidne inkluzije, skarnovsko ležište Rudnik

  • New paleoecological perspectives on Late Pleistocene Neanderthals in northern Balkans: the rodent assemblages from Smolućka cave (Serbia)

    Mihailo Jovanović, Katarina Bogićević, Draženko Nenadić, Jordi Agustí,·Christian Sánchez Bandera, Juan Manuel López García, Hugues Alexandre Blain (2022)
    During the Late Pleistocene, the Balkans came to be an important region with many isolated areas, enabling fauna, alongside Neanderthals, to thrive in the area. This work is focused on paleoenvironmental and paleoclimatic changes that occurred in the northern Balkan Peninsula with a special focus on fossil record from Smolućka cave aging from MIS 5 to MIS 3. Based on available data, an attempt has been made to establish a synthetic chronological context for the faunal assemblages recovered from ...
    MIS 5 to MIS 3, sitni sisari, klima, predeo, srednji paleolit, Balkansko poluostrvo

  • Approach to operational mine planning: Case study Tamnava West

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković (2014)
    ... the deposits on which exploitation is carried out are often, small in size, with poor quality and with complex structure and geometry, often in locations that have unfavorable infrastructure, or in regions with significant political instability. In the vast majority, mining projects, that ...
    ... software capable to cope with problems that are unique for specific open pit mine. Good example of custom made software is SUKU, software package developed on Faculty for Mining and Geology (Belgrade) with specialized tools for coal quality control management in a coal mines with continuous technology ...
    ... Currently, Tamnava West is a biggest coal open pit in Serbia, with capacity of 13 million tons of coal per year. The excavation technology of Tamnava West, is based on continuous mining equipment. Coal and interburden is excavated with 4 ECC systems (Bucketwheel Excavator - Conveyors-Crushing ...

  • Mine ventilation system planning using genetic algorithms

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    The most common problem in contemporary mining practice related to the planning and analysis of ventilation systems is the optimization of partially regulated air distribution in mine ventilation networks. This paper presents a two step optimization procedure for partly regulated air distribution in mine ventilation networks. The first step is the determination of air distribution in all branches using the well known Hardy-Cross method. In the second step the distribution and parameters of air flow regulators with minimum engaged ...
    coal, lignite, and peat; ventilation systems; coal mining; underground mining; ventilation; mathematical models; design; air flow; optimization; calculation methods

  • A bilingual digital library for academic and entrepreneurial knowledge management

    Ranka Stanković, Cvetana Krstev, Biljana Lazić, Dalibor Vorkapić (2015)
    A generic knowledge management process of organization, storage and retrieval of knowledge can suitably be fitted in a digital library. In the digital and knowledge age digital libraries can be used in knowledge management to handle intellectual assets and support knowledge creation. A multilingual digital library either stores content in more than one language or provides multilingual query access to monolingual content. In Serbia 18 of 308 scientific journals regularly published are bi-lingual, with papers simultaneously being in English ...
    Knowledge management, Digital library, Multilingualism, Language Resources, Terminology
    ... store its content in a NoSQL-database, with a web tool to enable the use of rich information in the stored text collections. The library content originates from various bilingual sources, with all documents aligned at the sentence level and provided with metadata. In designing Bibliša special attention ...
    ... most cases with “elektronsko učenje” (43), but also with “e-učenje” (38), “e- obrazovanje” (2), “e-nastava” (2), and “učenje na daljinu” (6). Translation for “e- learning” occurs twice while “e-learning” appears 93 times in 84 concordances. In the next iteration we enhance our query with these new ...
    ... they address, and the financial and institutional support they get. Digital libraries with multilingual content can be further differentiated. Most of them offer various works in different languages with no intention of providing the same works in several languages. It does not come as a surprise ...

  • Wordnet Development Using a Multifunctional Tool

    Ivan Obradović, Ranka Stanković (2007)
    In this paper we present a multifunctional tool for manipulating heterogeneous language resources. The tool handles electronic dictionaries, wordnets and aligned texts, and provides for their synchronous use in various tasks. We focus here on the description of the possibilities this tool offers in the development of wordnets. Besides the wordnet module which enables parallel handling of two wordnets, other modules, such as the module for morphological dictionaries and the module for aligned texts, as well as available finite ...
    Wordnet development, language resource integration, HLT tools
    ... is to exploit the possibility of working simultaneously with two wordnets. Namely, as we have already pointed the majority of wordnets tend to be aligned with PWN. Thus, if the wordnet that is being developed is used in parallel with PWN, then the lexicographer might first attempt to identify ...
    ... other resources are also at hand, and that they can be exploited simultaneously with wordnet development, means that the lexicographer developing the wordnet can get more support in the tasks he/she is confronted with, than the majority of wordnet tools can offer. 3 http://www.illc.uva.nl/ ...
    ... wordnets + Synsets retrievement using various methods + Navigation by following hypernym/hyponym relations + Copy of synsets with translation support + Exchange of information with morphological dictionaries + Production of Intex/Unitex graphs + Consistency checks on wordnets Figure 1. The UML diagram ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Fizičko-hemijsko raspadanje krečnjaka ugrađenih u objekte Beogradske tvrđave i mogućnost konsolidacije

    Maja Z. Franković (2022)
    Beogradska tvrđava, spomenik kulture od izuzetnog značaja za Republiku Srbiju, izgrađena je od krečnjaka badenske starosti. Njihova litološka heterogenost, u sadejstvu sa uticajima okruženja, rezultira visokim intenzitetima raspadanja. Korelacijom intrinzičnih sa ekstrinzičnim faktorima, definisani su fizičko-hemijski procesi raspadanja ugrađenih mikrofacija krečnjaka. Aplikacijom neorganskih konsolidanata na karbonatnoj bazi (nano-kreča i Ca-acetoacetata) i alkoksisilana, te korelacijom fizičko-mehaničkih svojstava pre i nakon tretmana, ispitana je efektivnost u pogledu zaustavljanja dekohezije krečnjaka. Određivanjem petroloških, tehničkih svojstava i mapiranjem formi raspadanja Mračne kapije kao ...
    krečnjaci, forme i intenziteti degradacije, fizičko-hemijsko raspadanje, konsolidacija, nano-kreč, Ca-acetoacetat, alkoksisilani, Mračna kapija

  • The state and perspective of the natural gas sector in Serbia

    Dejan Ivezić, Marija Živković, Dušan Danilović, Aleksandar Madžarević, Miloš Tanasijević (2016)
    The strategy of long-term energy development of Serbia identifies an increase of share of natural gas in final energy consumption as one of the main aims. Serbia has signed a strategic agreement with the Russian Federation on cooperation in the oil and gas sector, within which the project South Stream pipeline is planned to be realized. In addition, the Republic of Serbia has signed the Treaty that establishes the Energy Community and accepted the obligation to implement the Energy ...
    Consumption, natural gas, scenarios of development

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... treatments. They are manufactured in two diameters: • Rods with an outer and inner diameter of 22.2 mm x 9.5 mm, with an external thread diameter of 30.20 mm. • Rods with an outer and inner diameter of 25.4 mm x 12.7 mm, with an external thread diameter of 30.20 mm [3]. Figure 4.1. Polished ...
    ... easier to install and adapt in wells with irregular geometry (curved and slanted wells). With this pump configuration, the possibility of mechanical damage to the cylinder is reduced. This type of pump can be successfully used for pumping viscous oils with higher volumetric mass (uo > 400 mPas) ...
    ... loading, these pumps operate more efficiently compared to those with top seating. However, the possibility of mechanical damage to the upper guide due to friction with the rod is increased. The main disadvantage of insert pumps with bottom seating becomes evident in wells where sand is produced ...

  • Stratigraphy and microfossils (radiolarians and planktonic foraminifers) of the Upper Cretaceous (upper Santonian–lower Campanian) Struganik limestone (Western Serbia)

    Liubov G. Bragina, Nikita Yu. Bragin, Ludmila F. Kopayevich, Nevenka Đerić, Nataša Gerzina Spajić (2019)
    Paleontology, Stratigraphy, Ecology, Evolution, Behavior and Systematics

  • Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field

    Bojan Martinović, Dušan Danilović, Branko Grubač, Robert Fadiga (2022)
    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 optimisation

  • Interaction of sodium dodecylsulfate (SDS) with homoionic montmorillonites: adsorption isotherms and metal-ion release

    M. Ilic, J. Gonzalez, A. Pohlmeier, H. D. Narres, M. J. Schwuger (1996)
    The interaction of dodecylsulfate anions (DS−) with homoionic Ca-, Mg-, Ni-, Cu-, Cd-, Pb- and Fe-montmorillonites were investigated. Mg- and Cd-montmorillonite do not adsorb DS−, and an anion exchange at the edges of the clay mineral does not take place. Three different adsorption processes are identified on the other montmorillonites: i) Fe-montmorillonite is covered with amorphous iron hydroxide, and DS−-anions are bound at positively charged sites. ii) On Ca- and Pb-montmorillonite DS− is precipitated as Me(DS)2. iii) On Ni- ...
    Натријум додецилсулфат, адсорпциона преципитација, монтморилонит

  • An Approach to Development of Bilingual Lexical Resources

    Stanković Ranka, Obradović Ivan, Trtovac Aleksandra (2012)
    ... have been entered, together with their Serbian synsets with translational equivalents {stub, stubac, kolona} and {kolumna, rubrika, novinski stubac}. When the user enters a synset, with its terms separated by a comma, the system first checks whether a synset with these terms already exists in ...
    ... Another reason is the assessment that a bilingual resource in tune with Bibliša’s specifics would substantially contribute to its performance. Hence, Biblimir was born. 3.1 The Logical Model The logical model of Biblimir, with its characteristic classes, their attributes, as well as relations ...
    ... term column. The diagram should be read from left to right, starting with: TermEntry, Term=column. The diagram shows that this term appears in two English synsets, in one of them as the only term {column} and in the other with a second term {column, newspaper column}. Each of these synsets has ...

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... process requires high energy with the various transitioning processes which require high temperature and pressure to be more than 80% carbon efficient. To reduce energy costs associated with the process, materials like acetic acid and sodium hydroxide are replaced with hydrochloric acid which is ...
    ... dissolved CO- in the saline fluid reacts with the minerals in the rock. Mineral trapping is deemed the most secure form of CO» storage however it is a slow process and takes a longer period. The storage site must be highly porous and permeable with the seals with low porosity and permeability. The ...
    ... crises. Research in this work will provide a comprehensive and detailed information regarding the analysis of carbon capture with its emerging and new technologies with the intricacies and challenges associated, utilization of the carbon captured for enhanced oil recovery and carbon-based products ...