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Упит dcterms_subject_txt:Sustainability and the Environment

2793 items

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... sensitivity −10% and +10% change. According to the diagram (Figure 8), if the parameters increase, the center of gravity moves to the right. When the parameters are reduced, the center of gravity moves to the left of the diagram. The uneven shift of the focus to the left side of the diagram is due to ...
    ... represents the temperature. Based on the optimal and maximum fluid temperature at which each of the observed artificial lift methods can be applied, the higher the temperature of the fluid, the fewer the methods that can be applied. Parameter B4 represents the density of the fluid. The values of fluid ...
    ... well in relation to the standards for the other methods. The sensitivity of this model is performed, based on the intensity of the change in input parameters for the new well and the intensity of change in the results. For the output result Z to move to the ESP standard, the changes of input parameters ...

  • Understanding partitioning of deformation in highly arcuate orogenic systems: Inferences from the evolution of the Serbian Carpathians

    Nemanja Krstekanić, Liviu Matenco, Marinko Toljić, Oleg Mandić, Uroš Stojadinović, Ernst Willingshofer (2020)
    orogeneza, oroklini, višesmerna ekstenzija, transkurentna kretanja, Srpski Karpati
    ... Platform. To the south and west, the indentation of the Adriatic promontory in the Dinarides inverted the Pannonian Basin and started during the latest Miocene. The effects of this indentation are more pronounced in the NW near the junction with the Southern Alps and in the SE near the other junction ...
    ... shortening in the vicinity of the Supragetic thrust Although less extensive, the first set of structures are dominantly located along or in the vicinity of the Supragetic thrust and in all situ- ations the observed faults and folds do not deform and are buried beneath the sediments of the overlying ...
    ... controlled by Carpa- thian slab retreat to the north and north-east, the position of the rigid Moesian indenter and extension in the Dinarides to the west. c) 3D and cross-section sketches of the late Miocene reactivation of the Upper Getic thrust during the indentation by Moesian Platform (stable ...

  • Control of substructure construction of railways in the Republic of Serbia

    Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović (2022)
    Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...
    доњи строј, техничка регулатива, насип, збијеност, контрола
    ... conditions for the quality of the material installed in the layers of the substructure in terms of the value of the degree of compaction Rc*, ie the size of the deformation modulus Ev2, are determined by the standard SRPS U.E1.010 and SRPS U.B1.047. When building new and improving and renovating existing ...
    ... railways, the installation of a protective layer is mandatory. The surface of the protective layer meets the conditions [3:3-4] flatness of the s the maximum deviation of the elevation from the projected one is ± 10 mm; the minimum thickness of the protective layer is 20 cm, and in the case of thickness ...
    ... except for the load-bearing capacity at the level of the protective and transition layer, for other tracks and local railways meets the conditions: at the level of the embankment before the transition layer Ev2 > 45 MN/m2 2, Rc* Ev2 > 45 MN/m2, Ev2/Ev1 /m2 or Rc* > 100%; at the level below the embankment ...

  • SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian

    Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković (2019)
    У овом раду представљамо модел за избор добрих примера за речник српског језика и развој иницијалних компоненти модела. Метода која се користи заснива се на детаљној анализи различитих лексичких и синтактичких карактеристика у корпусу састављених од примера из пет дигитализованих свезака речника САНУ. Почетни скуп функција био је инспирисан сличним приступом и за друге језике. Дистрибуција карактеристика примера из овог корпуса упоређује се са карактеристиком дистрибуције узорака реченица ексцерпираних из корпуса који садрже различите текстове. Анализа је показала да ...
    Српски, добри примери из речника, аутоматизација израде речника, издвајање својстава, Машинско учење
    ... adverbs and verbs. Figure 2 presents corresponding boxplots, where the box represents the interquartile interval (IQR) with lower (Q1) and upper quartile (Q3), the middle bold line being the median (Q2), and the rhombus in the middle of the box presenting the average value, with POS on the x-axis and ...
    ... 13 The 40th and 65th percentiles of the SASA dictionary for number of words are the same as the values in the example given to the Sketch Engine. 265 Proceedings of eLex 2019 In the first decision step, the most distinctive feature, as expected, was abbrev (the indicator of the existence ...
    ... about the bibliographic source, the author, and optionally about the location, and indirectly related to information about the headword of dictionary entry, its part of speech and linguistic labels assigned to the headword and lexical unit. A classification of labels is also incorporated in the database ...

  • A Twitter Corpus and Lexicon for Abusive Speech Detection in Serbian

    Danka Jokić, Ranka Stanković, Cvetana Krstev, Branislava Šandrih (2021)
    Uvredljivi govor na društvenim medijima, uključujući psovke, pogrdni govor i govor mržnje, dostigao je nivo pandemije. Sistem koji bi bio u stanju da detektuje takve tekstove mogao bi da pomogne da internet i društveni mediji postanu bolji virtuelni prostor sa više poštovanja. Istraživanja i komercijalna primena u ovoj oblasti do sada su bili fokusirani uglavnom na engleski jezik. Ovaj rad predstavlja rad na izgradnji AbCoSER-a, prvog korpusa uvredljivog govora na srpskom jeziku. Korpus se sastoji od 6.436 ručno označenih ...
    uvredljivi jezik, govor mržnje, srpski, tviter, leksikon, korpus
    ... interpretation can be influenced by the domain of the conversation, the context of the discourse, the objects that accompany the conversation (images, video, and audio materials), the time of publication and ongoing world events and the recipient of the message [38]. Given the huge amount of online material ...
    ... al. [47] in the second layer classifies the type of insult (vulgar speech, insult, attack), Zampieri et al. [50] and Fisher et al. [15] emphasize the type and the target of offensive speech. The OLID data set and the scheme proposed by Zampieri et al. [50], used also at the SemEval2019 and SemEval 2020 ...
    ... endIndex 25 . and emoticons change the meaning, usage of irony and sarcasm that is hard to detect in written language, as well as the necessity to possess knowledge about the world and current circumstances to understand and annotate the message. In the next phase, we plan to extend the AbCoSER corpus ...

  • Joint interpretation of paleomagnetic, structural and AMS results from the Vardar Zone of Serbia

    Emo Marton, Marinko Toljić, Vesna Lesić, Vesna Cvetkov (2021)

  • The Dictionary of the Serbian Academy: from the Text to the Lexical Database

    Ranka Stanković, Rada Stijović, Duško Vitas, Cvetana Krstev, Olga Sabo (2018)
    In this paper we discuss the project of digitization of the Dictionary of the Serbo-Croatian Standard and Vernacular Language. Scanning and character recognition were a particular challenge, since various non-standard character set encoding was used in the course of the almost 60-year long production of the dictionary. The first aim of the project was to formalize the micro-structure of the dictionary articles in order to parse the digitized text of and transform it into structured data stored in relational lexical database. This approach ...
    computer lexicography, lexical database, language resources, dictionary, Serbian language
    ... following mostly the lemon model. Mapping of the lexical entry markers to LexInfo and TEI enabled export of the lexical data to the mentioned formats. A software solution for the dictionary text analysis, parsing and lexical database population was developed and tested on the first and the last published ...
    ... Figure 1: The microstructure of dictionary articles. 4 The transformation from the dictionary article text form to the lexical database The guidelines for dictionary writing were used to defi ne the rules for the segmentation of the dictionary articles, the pattern recognition, and the alignment ...
    ... language 1 Introduction The first volume of the Dictionary of the Serbo-Croatian Standard and Vernacular Language (re- ferred to as the Dictionary of Serbian Academy or DSA), prepared and compiled by the Institute for the Serbian Language of the Serbian Academy of Sciences and Arts, was published in ...

  • Lower Berriasian ammonites from Dedina (Golubac Mountains, eastern Serbia) and their biostratigraphic implication

    Zdenek Vasícek , Dragoman Rabrenović, Petr Skupien, Barbara Radulović (2023)
    Ammonites, Taxonomy, Lower Berriasian, Getic, Northern Tethys, Serbia
    ... steeply to the line of coiling. The whorls are slightly arched with a relatively long stretch descending to the venter. The ventral side is narrow, flat, and rounded. The ribs on the penulti- mate Wwhorl and at the beginning. of the last whorl are densely spaced. On the penultimate whorl, the initial ...
    ... approximately 10% of the collection. The aforementioned circumstances make it possible to measure the dimensional parameters of the shells on one dimension only and, on the ribbed shells, to count the number of ribs lying at the umbilicus and outside of the half-whorl. The specimens, with a few ...
    ... preserved. For the measurements of such specimens, the diameter of the shell, D, for which the measurement was made to one-tenth of a mm (or Dmax, indicating the maximum preserved shell size), as well as the height of the whorl (H), width of the umbilicus (U), and the ratios of H/D and U/|D are given ...

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... lignite from the "Tamnava – Zapad" pit [Knežević et al, 2014], where the x-axis shows the number of layers in a pile (package), while the y-axis shows the standard deviation for LHV, and the narrow gray lines show the different simulations. The bottom and top dotted lines show the minimum and maximum ...
    ... increasing the number of piles and ensuring larger reserves at the stockyard. The relationship between the number of rows and reserves at the stockyard is shown in Figure 4 and Table 1 on the example of the "Tamnava - Zapad" pit. The example shows stacking in two rows, in four and six piles when ...
    ... quality, i.e. the quality the customer demands. Sizing a coal homogenization stockyard is practically carried out in two steps. The first step involves sizing the pile, and the second determining the number of piles. i.e. the overall size of the stockyard. In both cases the length, width and height of ...

  • Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer

    Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)
    ... transitory nature, while only about 17o comes from rainfall within the region. The major rivers are the Danube and the Tisa. At the Hungarian-Serbian border the average annual river flow of the Danube is around 2500 m3 s-1, while for the Tisa the average is 700 m3 s-1. Figure 4.9.1 Location map of study area ...
    ... tapping is from the second and third aquifer layers, for the water supply of the main Hungarian consumer Szeged and for geothermal energy, the deeper acluifer layers (fourth and fifth) are intensively used. Some of the concrete proposals of the SUDEHSTRA project include [9]: . centralize the waterworks ...
    ... model was created and tested. The results of the conducted survey enabled the proposal of many concrete measures and activities for better management and sustainable development of the groundwater as a very important and even sole resource in large parts of this region. The proposals that can be ...

  • FrameNet Lexical Database: Presenting a Few Frames Within the Risk Domain

    Aleksandra Marković, Ranka Stanković, Natalija Tomić, Olivera Kitanović (2021)
    U radu se daje kratak prikaz teorije semantike okvira, na kojoj je zasnovana leksička baza Frejmnet. Predstavljena je koncepcija ove mreže, kao i mogućnosti njene primene. Predstavljena je i leksička analiza koja se primenjuje u projektu izrade Frejmneta i ukazano na razlike između analize zasnovane na okviru u odnosu na analizu zasnovanu na reči. Zatim je prikazano nekoliko povezanih okvira koje prizivaju reči iz domena rizika. U radu je predstavljena i platforma NLTК pomoću koje se mogu koristiti ...
    Srpski jezik, semantika okvira, FrameNet, scenario rizika, rudarski korpus, obrada prirodnog jezika
    ... social science research with the research into the meaning of the word it- self remaining vaguely defined (Hamilton, Adolphs, and Nerlich 2007, 164). Guided by this notion, the authors continue to analyze the meaning of the noun risk and the verb to risk using the Cambridge and Nottingham Corpus of Discourse ...
    ... verbs, semantic roles and typical semantic-syntactic patterns of the most frequent verbs were presented for each of the corpora. The verb to be and the semantic role of patient were the most frequent in both corpora, while the second place went to the role of agent (95–96). In the paper, semantic roles ...
    ... paper illustrates the results of preliminary research exploring the possi- bility of application of the frame semantics theory and the principles used in building the FrameNet semantic network using the examples from the risk domain adapted to Serbian. We also show the inner workings of the NLTK suite usable ...

  • Pre-failure deformation monitoring as rockfall prediction tool

    Miloš Marjanović, Biljana Abolmasov, Zoran Berisavljević, Marko Pejić, Petko Vranić (2021)
    General Engineering
    ... 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 sever medium-sized blocks, undercut by the bedding plane (dipping into the mass), causing combined free-fall (more dominant) and rock-slide ...
    ... weathering and deformations related to the relaxation (tensile failures parallel to the face, small-scale shearing, etc.), causing relatively active slope. Rockfall volume and runout were considered as insignificant, and the slope is therefore, left unsupported and unprotected (figure 2). The cut seems ...
    ... distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd Mechanics and Rock Engineering, from Theory to Practice IOP Conf. Series: Earth and Environmental Science 833 (2021) 012197 IOP Publishing ...

  • Nonequilibrium athermal random-field Ising model on hexagonal lattices

    Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević (2021)
    Изингов модел, хексагонална решетка

  • 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 ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • Late and post-collisional tectonic evolution of the Adria-Europe suture in the Vardar Zone

    Emő Márton, Marinko Toljić, Vesna Cvetkov (2022)
    The Vardar Zone is a product of the Triassic-Jurassic opening of the Neotethys, Jurassic obduction, Late Cretaceous/Paleogene consumption of the oceanic crust and continental collision. During the last process, the Eastern Vardar Zone was thrust over the Central and eventually both onto the Western Vardar Zone. The present paleomagnetic and structural study provided new results from the first two zones in the Belgrade area. The younger set of data, together with published ones from the third zone, provide firm ...
    Adria–Europe suture, Vardar Zone, Paleomagnetism, Thrusting, Vertical axis rotation

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... with the neighbours (Bulgaria, Croatia, Romania, etc.) should open possibilities for natural gas supply from some of planned international gas routes (South Corridor projects) and liquefied natural gas terminals. Nevertheless, the planning of energy security on the basis of sustainability and equal ...
    ... represented by the ration of net imports and total available primary energy consumption (SOS1) within a given year. The second indicator of SOS is the ration of the stocks of critical fuels and corre- sponding annual fuel consumption (SOS2). The purpose of this indicator is to measure the availability ...
    ... result is the consequence of the inefficient use of energy resources, but also the low economic productivity of the country and low GDP level. Modification of the value of this indicator can be done if GDP is converted from the real national currency at purchasing power parity (PPP), for the base year ...

  • Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations

    Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković (2021)
    The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...
    severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija
    ... related to the Oligocene–early middle Miocene Cerna and Timok faults of the South and Serbian Carpathians, located to the east and south-east of the study area (Fig. 1b). To the south of the study area, such low-offset strike-slip deformation was documented away from the Cerna and Timok faults ...
    ... Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally ...
    ... metamorphic rocks of the Supra- getic Unit. Contrary to the Central Serbo-Macedonian Subunit, the Northern Serbo-Macedonian Subunit between the Vršac Mts. in the north and the Jastrebac Mts. in the south was strongly influenced by processes associated with the Pannonian Basin extension. The Oligocene–Miocene ...

  • Geodynamics of basins above subducted slabs: An integrated modelling study of tectonics, sedimentation, and magmatism in the Timok Magmatic Complex

    Uros Stojadinovic, Marinko Toljic, Branislav Trivic, Radoje Pantovic, Danica Sreckovic-Batocanin, Nemanja Krstekanic, Bojan Kostic, Milos Velojic, Jelena Stefanovic, Nikola Randjelovic, Maja Males (2024)
    Timok Magmatic Complex, Neotethys subduction, basin geodynamics, analogue modelling

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

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

  • Permanent GNSS monitoring of landslide Umka

    Mileva Samardžić Petrović, Jovan Popović, Uroš Đurić, Biljana Abolmasov, Marko Pejić, Miloš Marjanović (2020)
    Клизиште Умка је једно од највећих насељених активних клизишта у Србији. Активност клизишта Умка се прати већ више од 85 година, различитим геотехничким и геодетским техникама. Од 2010. године, активност kлизишта се континуирано прати у реалном времену аутоматизованим перманентним системом за праћење базираним на Глобалним навигационим сателитским системима (ГНСС). Поред тога, од 2018. године активност клизишта се додатно прати кинематичким ГНСС одређивањем положаја скупа карактеристичних тачака као и применом UAV фотограметрије. Главни циљ овог рада је приказ резултата опажања три ...
    клизиште, перманентно праћење, ГНСС
    ... analyzed for two time periods separately, due to the relocation of the object point on December 2013 [1]. The first time period from the beginning of the monitoring, March 2010, to the December 2013; and the second time period from the September 2014 to the date (Figure 2.). Displacement of object ...
    ... between University of Belgrade, Faculty of Mining and Geology and Faculty of Civil Engineering, Institute of Transportation CIP, The Highway Institute and company Vekom. The detailed descriptions of the technical part and the main characteristics of the established automated GNSS monitoring system can ...
    ... crossing the landslide body. According to the available data regarding the traffic volume [12] average annual daily traffic across the landslide body for the year 2018 is 13970 vehicles per day and is showing increasing trend. Considering the possible disasters, the Umka landslide is one of the most ...