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Упит dcterms_subject_txt:dewatering system

703 items

  • Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković (2021)
    The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...
    In Pit Crushing and Conveying, IPCC, open pit mining, haulage, optimization, costs saving

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...
    ... of the initial system is in general better among first-ranked documents than in the case of the improved system, with the excep- tion of the InQuery method, while the recall is better with the improved system. Although the precision-recall curves offer a pretty good insight into system performance, it ...
    ... comparison to the initial system, ranging from 0.36 to 0.46. It should be noted that for the query ležǐste bakra ‘copper deposit’ the improved system assigns two nouns, bakar ‘copper’ and bakra ‘copper cauldron’, but the results are nevertheless better in comparison to the initial system, which does not recognize ...
    ... is cumber- some, and the improved system is by all means more precise. Another evaluator remarked that although the initial system performs well for some simple queries, it often gives completely erroneous results for complex ones. If assessed, the ini- tial system would have a mark of 2 and the improved ...

  • Data from the Digital Repository of the Faculty of Mining and Geology in eScience (eNauka)

    Biljana Rujević, Mihailo Škorić (2024)
    The paper describes linking the Digital Repository of the University of Belgrade, Faculty of Mining and Geology, with the eScience system in terms of transferring metadata about the results of researchers' scientific work. The steps taken to ensure a smooth harvesting of metadata are outlined. Additionally, a presentation of additional improvements to the OAI system is provided, aiming to contribute to the automatic linking of authors with their results in the eScience system.
    репозиторијуми, еНаука, метаподаци, Рударско-геолошки факултет

  • Multi-Criteria Fuzzy-Stochastic Diffusion Model of Groundwater Control System Selection

    Dušan Polomčić, Zoran Gligorić, Dragoljub Bajić, Miloš Gligorić, Milanka Negovanović (2019)
    When considering data and parameters in hydrogeology, there are often questions of uncertainty, vagueness, and imprecision in terms of the quantity of spatial distribution. To overcome such problems, certain data may be subjectively expressed in the form of expert judgment, whereby a heuristic approach and the use of fuzzy logic are required. In this way, decision-making criteria relating to an optimal groundwater control system do not always have a numerical value. Groundwater control scenarios (alternatives) are identified through hydrodynamic ...
    expert judgment, linguistic variables, fuzzy dynamic TOPSIS, hydrogeology, groundwater control system, open-cast mine, geometric Brownian motion

  • Unusually sluggish microemulsion system with water, toluene and a technical branched alkyl polyethoxylate

    Marija Ilić, Franz-Hubert Haegel, Vesna Pavelkić, Snežana Zlatanović, Zoran Marković, Aleksandar Cvjetić (2015)
    Microemulsion systems with water, toluene and nonionic surfactants are interesting for application due to the excellent solvent properties of aromatic hydrocarbons. In this study, the pseudo-binary phase diagram (“fish-diagram”) of such a ternary system was investigated using a branched technical alkyl polyethoxylate. Lutensol ON 50 (i-C10E5) was considered a suitable surfactant. The system with technical branched i-C10E5 exhibits very long, and for compositions near optimum solubilization, i.e., the minimum content of surfactant needed for a bicontinuous microemulsion, extremely long ...
    микроемулзија, толуен, оксоалкохол етоксилат, термодинамичка стабилност, тернарни фазни дијаграми, дијаграми „fish“

  • Linear-motor plunger pump increases lifting efficiency

    Bojan Martinović, Dušan Đekić, Dušan Danilović, Pavel Isaev (2022)
    plunger, linear, motor, pumps

  • Nonequilibrium athermal random-field Ising model on hexagonal lattices

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

  • Pannonian Basin, Pannonian Basin System and Pannonian realm - three different concepts

    Dejan Radivojević (2019)
    Centralni Paratetis, neogen, Panonski basen, Sistem panonskog basena, Panonska oblast
    ... 2023-10-14 04:22:18 Pannonian Basin, Pannonian Basin System and Pannonian realm - three different concepts Dejan Radivojević Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Pannonian Basin, Pannonian Basin System and Pannonian realm - three different concepts | ...
    ... басен, Систем панонског басена, Панонска област 14 беотоггРогит 2019: Соп/егепсе Ргоргатте апа Abstracts Pannonian Basin, Раппопјап Basin System апа Pannonian геајт – three different concepts Dejan Radivojević University of Belgrade, Faculty of Mining and Geology Even though the area ...
    ... since the deposition in a basin can not be viewed separately from the sediment source that will fill the basin, the notion of the Pannonian Basin system was introduced, which included, besides the агеа ог Pannonian basin sensu stricto also the neighboring orogen represented by the Carpathians, the ...

  • Geologic Information System of Serbia

    Branislav Blagojević, Branislav Trivić, Ranka Stanković, Nenad Banjac, Olivera Kitanović (2011)
    Geologic information system of Serbia (GeolISS) represents repository for digital archiving, query, retrieving, analysis and geologic data visualization. The GeolISS is implemented through ESRI ArcGIS technology, and is designed to operate as a personal geodatabase (MS Jet 4.0 Engine) and SDE enterprise geodatabase in MS SQL Server. The objective of GeolISS implementation is integration of existing geologic archives, data from published maps at different scales, newly acquired field data, as well as Web publishing of geologic information. Physical implementation ...
    Geologic information system, Conceptual model, Logical model, Implementation, Geodatabase
    ... INFORMATION SYSTEM OF SERBIA BRANISLAV BLAGOJEVIĆ1, BRANISLAV TRIVIĆ2, RANKA STANKOVIĆ3, OLIVERA KITANOVIĆ4 and NENAD BANJAC 5 Abstract Keywords: Geologic information system, Conceptual model, Logical model, Implementation, Geodatabase. Geologic information system of Serbia (GeolISS) ...
    ... 2023-10-14 03:26:08 Geologic Information System of Serbia Branislav Blagojević, Branislav Trivić, Ranka Stanković, Nenad Banjac, Olivera Kitanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Geologic Information System of Serbia | Branislav Blagojević, Branislav ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... tal system modeling in energy industry is based on the use of analytical calculations, statistical analyses, definitions of economic parameters, or assessment of energy losses. System analysis based on a simulation of discrete events (representation of the real state of the environmental system, stochastic ...
    ... l quality is an effective environmental management system (EMS) in mining and energy complexes. The aim of this study is to promote and elaborate the possibility for improving the mining and energy complex environmental protection/management system by applying the basic principles of sustainable development ...
    ... environmental aspects is the first part of the planning system of environmental management and the activities related to them. The accomplishment of critical path activities represents the basis for improving the environmental protection system in mining and energy complexes. Discussion: Application ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... old system finds the positive match zlatonosna žica ‘gold vein’ when searching with zlato, which the new system misses (zlato and zlatonosan are two different lemmas); however, for the same reasons, the old system has the negative match Zlatokop (the name of one settlement), which the new system again ...
    ... abovementioned query. The charts show that the search precision of the old system is significantly better among first-ranked documents, while the recall is much better with the new system: among the first 80 documents the old system had 25 relevant responses, and the new had 39. If the Interpolated Average ...
    ... accuracy of the new system is significantly greater (see queries 8 and 9 in Table 2). Table 2. Average Precision per query and Mean Average Precision (MAP) for the old and the new system. A space in a query stands for an OR operator, a semicolon for an AND operator (relevant for the old system). No. Query ...

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... structures in engineering systems. When the system has a backup or some other connection is used, the outcome is formed as a logical conclusion (if–then form) for any risk situation caused by a failure of the engineering system. For example, if the system consists of two elements, one and two, where ...
    ... risk level of failure in an engineering system using this methodology, it is necessary to rationally divide the system into subsystems and the subsystems into elements—that is, into functional units that each affect the risk indicators. The engineering system (the crushing machine) was divided into ...
    ... level, with the same membership degree of 0.30672, or 30.67%. 5.3. Risk Level Assessment of System Failure 5.3.1. Fuzzy Composition for Risk Level Assessment of System Failure A risk level assessment for system failure within the crushing machine was performed as a synthesis assessment of the risk level ...

  • The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system

    Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic (2016)
    The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...
    микроемулзија, толуен, алкил полиглукозид, оксоалкохол етоксилат, појачивач ефикасности, „fish“ дијаграми
    ... / 20 of system with C, E, jE o phase boundary 10 / LC of system with C„E, j| ——— l utensol ON 50 T( 'C ) fFigure 2. Phase diagrams of wafer/toluene/CyoEs and water/toluene/Lutenso/ ON 50 at equa!l mass fractions of water ana toluene (a = 0.5). The phase boundaries of the system with Cx+oEs ...
    ... ETHOXYLATED ALCOHOL BOOSTERS) ON THE PHASE BEHAVIOR OF A WATER/TOLUENE/ fTECHNICAL ALKYL POLYETHOXYLATE MICROEMULSION SYSTEM Article Highlights • Addition of sugar surfactant to system of water/tolune/Lutensol ON 50 was investigated • Sugarsurfactant shifts the phase behavior to lower temperature ...
    ... excess water (2Q ). This system exhibits a strong tendency to form liquid crystals. Its phase diagram shows a large area of liquid crystals (LC) surrounded by microemulsion (regions 10 and 1#*). These results are very similar to those reported for the same system with equal vol- ume fraction ...

  • State and perspective of individual household heating in Serbia: A survey-based study

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    This paper presents the results of the household survey on individual household heating systems in Serbia. The survey was conducted in the period October to December 2020 with the participation of 1100 households with individual household heating systems. The information collected in the questionnaire can be separated into three main parts: basic household data, current heating system characteristics, and households’ perceptions and attitudes. The survey results provide unique and comprehensive information concerning individual household heating systems and the main ...
    Domaćinstva, Individualni sistemi grejanja, Korišćenje energije, Stavovi potrošača, Anketa, Srbija

  • Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling

    Branislav Petrović, Veljko Marinović, Zoran Stevanović (2023)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Optimisation of underground mine decline development system using genetic algorithm

    Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović (2014)
    ... is necessary to interconnect them into one integrated system. There are different development systems (shaft, decline, adit) which can be used to create such system. Suppose the deposit characteristics indicate that decline development system is preferred one. In such environment we treat development ...
    ... Genetic algorithm. 2. THE MODEL OF A DECLINE DEVELOPMENT SYSTEM In many cases, the ore deposit is composed of a few ore bodies that must be interconnected into one integrated system. The main idea that we used to create such system is based on the fact that somewhere in 3u (3–dimensional ...
    ... mine decline development system using genetic algorithm Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Optimisation of underground mine decline development system using genetic algorithm ...

  • Assessments of effects of implementation of strategic plans for development of Belgrade District heating system

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić (2020)
    The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...
    Daljinsko grejanje, LEAP, Primarni energetski faktor, Uvozna zavisnost, CO2 emisija

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... applications and knowledge assets, supported by knowledge management analytical services implemented in a business intelligence system. This paper describes such a system for mine safety and its application for accident analysis in mines, developed to improve efficiency, offer fast answers and key ...
    ... purposes. In this paper we outline our approach to development of a business intelligence system for mine safety illustrated by its application to accident analysis in mines. The aim of the BI system is not only to improve efficiency of mine safety procedures, enable faster answers and key safety ...
    ... kolonja@rgf.bg.ac.rs 13th ISCSM 2016 BELGRADE 2 system consists of several software components representing a combination of different information technologies, where interoperability between diverse software components is secured by a system of ontologies developed for mining engineering named ...

  • 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
    ... main characteristics of the established automated GNSS monitoring system can be find in Erić et al. [6]. Generally, the Umka monitoring system consists of GNSS network and supporting software solutions. The first part of the system, the network, consists of several reference points and one object ...
    ... geodetic techniques. Since 2010, landslide activity has been continuously monitored by automated permanent Global Navigation Satellite System (GNSS) based monitoring system in real time. Furthermore, since 2018 landslide activity has been monitored by GNSS kinematic positioning of a set of characteristic ...
    ... types of complex monitoring automated systems found its use in various engineering disciplines. The Global Navigation Satellite System (GNSS) based monitoring system is one of the widely used systems, used in order to assess the dynamics of the landslide phenomenon and potentially prevent possible ...

  • A tool for identifying the criticality in the disordered systems with metastable dynamics

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević (2021)
    Физика кондензоване материје