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Упит dcterms_creator_txt:Rundić Ljupko and Ducea Mihai

1540 items

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)
    ... loading, and the like, which arc extremely pronounced in mining machinery. For monitoring purposes, measurement was undertaken in all three directions, upon overhaul and after 11,850 hours of opceration. Movement, speed and acceleration of oscillations werc plotted using: measured data and thc cffect ...
    ... stability problem, its basic definitions and the principles, important phenomena, rescarch motivations and applications in engineering. Luo and Tong [2] develop an efficient algorithm to find a moving is surface threshold lcvel for evolving the design boundary and updating the weighting factor. The ...
    ... under harmonic excitation and the results show that the method can successfully identify and locate the damage. Slopes of longitudinal vibration shapes are shown to be suitable for damage detection in bars and have potential for application in noisy environments. Zhu and He [5] propose a vibration-based ...

  • 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
    ... three different scenarios (baseline, optimistic, and pessimistic), which have been selected, developed, and analyzed. Special attention was devoted to the possibility of using natural gas in electricity production and the harmonization of electricity and natural gas energy sector. 2. Indigenous production ...
    ... 2 million m3 is transit to Bosnia and Herzegovina), and with 90% availability, the current possible annual import is approximately 3.6 billion m3 (Ivezić et al., 2012). The distributive gas network includes pipelines of medium and low pressure, as well as metering and regulation stations. In the distribution ...
    ... increase the security and quality of supply, reduce transit costs, and enable systematic gasification in the central, eastern, and southern parts of Serbia (Government of the Republic of Serbia, 2008). The South Stream pipeline allows the possibility for the further development and construction of storage ...

  • Introduction to special section: Characterization of hydrocarbon and geothermal resource potential and carbon sequestration opportunities of the Pannonian Basin

    Balázs Németh, Gábor Tari, Gábor Bada, Dejan Radivojević, Bruno Tomljenovic, Csaba Krézsek (2018)
    нафтна геологија, геотермална енергија, Панонски басен
    ... e (Horvath et al. and Gúthy et al.) to local-scale (Loisl et al.) structural evolution of the basin, petroleum geology and systems (Lember- kovics et al., Cvetković et al., Ivanišević and Radivojević, and Rotár-Szalkai et al.), geothermal energy (Macenić and Kurevija) and CO2 storage (Vulin ...
    ... Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Introduction to special section: Characterization of hydrocarbon and geothermal resource potential and carbon sequestration ...
    ... south and by the Southern and Eastern Alps from the west. The basin hosts several hydrocarbon systems that are located within the very complex system of extensional subbasins within the main basin. One unique aspect of the Pannonian Basin is that it is underlain by anomalously thin crust and lithosphere ...

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik

  • A Description of Morphological Features of Serbian: a Revision using Feature System Declaration

    Cvetana Krstev, Ranka Stanković, Vitas Duško (2010)
    In this paper we discuss some well-known morphological descriptions used in various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems on Serbian. We have spotted four groups of problems: the lack of a value for an existing category, the lack of a category, the interdependence of values and categories lacking some description, and the lack of a support for some types of categories. At the same time, various descriptions often describe exactly the same ...
    Morphology, Lexicon, lexical database, Standards for LRs

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)

  • 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

  • Towards translation of educational resources using GIZA++

    Ivan Obradović, Dalibor Vorkapić, Ranka Stanković, Nikola Vulović, Miladin Kotorčević (2016)

  • 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

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)
    ... Mine Safety, Mine Planning and Produc- tion, Management Information Decision Support System and Technical Data, and delivers critical internal and external information needed to support mining business. TIS components are integrated and operate with a unique database, and PROTECTOR, the hybrid system ...
    ... (Kecojevic and Radomsky, 2004; Karra, 2005; Bennett and Passmore, 1986; Marovelli, 1981). Several studies have been conducted on hazard identification and risk assessment (South African Mining Industry, 2003; Joy and Griffiths, 2005) which aims to provide advice on hazard identification and risk assessment ...
    ... safety need expert knowledge and experience to be fully exploited. This knowledge consists of rules and heuristics experts use when they apply numerical methods, and Artificial Intelligence offers formalisms and mechanisms for its incorporation in software systems (Russell and Norvig, 2002). Formalization ...

  • Numerical modeling of Selanac debris flow propagation using SPH code

    Jelka Krušić, Biljana Abolmasov, Miloš Marjanović, Manuel Pastor, Saeid M. Tayyebi (2021)
    The Selanac debris flow is a very huge event triggered after extreme rainfall caused by Cyclone Tamara activity in the Republic of Serbia in May 2014. The Selanac case study was already modelling in different programs using Voellmy rheology assumptions like RAMMS software. In this paper research are focusing particularly on the process of debris flowing from initiation zone to main deposition area using Geoflow SPH two-phase model considering frictional rheology law. Main rheological parameters are back-calculated using also ...
    debris flow, modelling, SPH code, DEM

  • 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)

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction

  • Hydrogeochemistry of Uranium in the Groundwaters of Serbia

    Marina Ćuk, Maja Todorović, Petar Papić, Jovan Kovačević, Zoran Nikić (2015)
    ... usually low (Gómez et al. 2006) and spatially and genetically associated with granitic rocks and can be deposited in clastic sediments (Nikić 2008). Methods One hundred and seventy-two groundwater samples were collected in 2012 across Serbia, from water wells and natural springs (Fig. 3). The ...
    ... type determinations and for establishing the uranium ionic forms. The results were statistically processed using IBM software SPSS 17.0, and graphically interpreted by ESRI ArcGIS 9.3. Results and Discussion The statistical values of the major hydrochemical parameters and uranium concen- trations ...
    ... levels, UO2OH+and (UO2)3(OH)- 7 became dominant (Fig. 2). Under reducing conditions, uraninite (UO2) tends to be predominant over a wide pH range, while uranous (U4+) and U(OH)– 5 may be present under extremely acidic and alkaline conditions, respectively. Pitchblende (U3O8) and U4O9, oxidized ...

  • Business Models for Small-scale Biomass Projects Development

    Dejan Ivezić, Miodrag Gluščević, Marija Živković (2019)
    Biomass is recognized as the most promising renewable energy source in Serbia. The share of biomass in Serbian final energy consumption is over 10%, but mostly related to traditional use in stoves and ovens. One of the main obstacles for wider implementation of contemporary biomass facilities is the inexperience of consumers and stakeholders in the implementation of “innovative” business models, especially in the cases of small-scale projects. In this paper, three different business models (public utility company, energy cooperative ...

  • Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy

    Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana (2021)

  • The effect of finite driving rate on avalanche distributions

    Sonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević (2021)
    Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear Physics
    ... in (a), and for L = 512 with exponents τ ′ns = 2.40±0.04 and σns = 0.87±0.05; (c) τ ′ns = 4.30±0.15 and σns = 7.6±0.8. (d), (e) The variation of the exponents τ ′ns and σns, respectively, with the driving rate Ω for the integrated size distributions of nonspanning avalanches for L = 128, 256 and 512 as ...
    ... Zapperi S, Cizeau P, Durin G and Stanley H E 1998 Phys. Rev. B 58 6353 [13] Durin G and Zapperi S 2006 The Science of Hysteresis ed G Bertotti and I Mayergoyz vol 2 (New York: Academic) pp 181–267 [14] White R A and Dahmen K A 2003 Phys. Rev. Lett. 91 085702 [15] de Queiroz S L A and Bahiana M 2001 Phys. Rev ...
    ... Phys. 10 L257 [25] Parisi G and Sourlas N 1979 Phys. Rev. Lett. 43 744 [26] Bricmont J and Kupiainen A 1987 Phys. Rev. Lett. 59 1829 [27] Parisi G and Sourlas N 2002 Phys. Rev. Lett. 89 257204 [28] Tissier M and Tarjus G 2011 Phys. Rev. Lett. 107 041601 [29] Fytas N G and Mart́ın-Mayor V 2013 Phys. Rev ...

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants

  • 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

  • A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers

    Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić (2019)
    Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...
    Efikasnost, Fazi zaključivanje, Prikupljanje podataka, Buldozer
    ... The R and M values are obtained in fuzzy form (1) by mapping functions f(t) and f() to the µ-j coordinate system (Fig. 2). The ratio between j and real-time defines the position of reliability and maintainability fuzzy numbers. (Fig. 7 and 8). Recorded minimal and maximal times in operation and in failure ...
    ... capacity of the system to prevent and detect failures and damage, as well as reestablishing operating ability and functionality through technical attention and repairs. Reliability and maintainability can be calculated using collected data about time in operation and in failure. These data are presented ...
    ... 1951), and the case of a small sample (median rank and Bernards approximation) are given in Table 7 and 8. Features of reliability theory and WTPD (shape parameter β, scale parameter μ and mean time ) are well known (Dhillon, 2008), (Krunic et.al, 2018). 4.2.2 Fuzzification of Reliability and Maint ...