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Упит dcterms_subject_txt:tunnel construction

267 items

  • 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

  • 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

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... waste- water. As the aim of this research is to estimate the poten- tial of this energy source in the cities without WWTP (but with plans for WWTP construction in the future), the heat energy that could be produced from the WWTP and related primary energy savings is calculated for the selected city with ...
    ... pro- vide the basis for the estimation of recoverable heat energy potential for other cities, with district heating systems and plans for WWTP construction, as well as for the evaluation of effects of utilization of full potential. Based on the outcomes from the first and second parts, the projection ...
    ... cities, constructions of wastewater treatment plants are taking place, while in several cities preparation of pro- jects has been initiated, so construction of wastewater treat- ment plants can be expected in the near future (Ministry of environmental protection 2019). One of the newest and most c ...

  • Hydrochemical impact of the hydraulic tunnel on groundwater in the complex aquifer system in Pirot, Serbia

    Marina Ćuk, Igor Jemcov, Ana Mladenović, Marina Čokorilo Ilić (2020)
    Hidrogeohemijski procesi, hidrohemijske promene, karstna izdan, tunel pod pritiskom, multivarijantne statističke analize

  • Formative evaluation of e-learning projects with the logical framework approach

    Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković (2015)
    ... ac.rs Abstract: Evaluation of E-learning projects is a topic of great interest and growing importance. The evaluation of a project is the construction of the overall judgement, based on a quali-quantitative determination of the benefits and costs associated, with scientific criterion, of a project ...
    ... 1. INTRODUCTION Evaluation of E-learning projects is a topic of great interest and growing importance. The evaluation of a project is the construction of the overall judgment, based on a quali-quantitative determination of the benefits and costs associated, with scientific criterion, of a project ...

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)
    ... the link is pro- portional to the overall co-ccurrence frequencies of the corresponding word pairs within a corpus. We will focus on the network construction around co-occurrence relations of adjacent words within sentences, since it requires no semantic or syn- tactic preprocessing of the input text ...
    ... address in the future. Moreover, the benefit of this work could be considered in future research, as the initial step in extracting concepts for the construction of the ontology for the domain of geology and mining in the Serbian language. Finally, it is worth mentioning that the different structure and ...
    ... short abstracts. Besides that, extracted key- words from whole papers can serve as a basis for the first approximation of a geological ontology construction. In addition, we will explore, if we can gain by translating the set of annotated keywords from the source to the target language and obtain larger ...

  • 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

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... part of the Trebišnjica Hydrosystem, Krupac and Slano reservoirs near Nikšić, and Perućica HPP in Montenegro. They also got to see the construction of a tunnel of the Dabar Hydroelectric Power Plant near Nevesinje. As such, this course certainly represents a unique example in the world as it coveTs ...
    ... hydrogeological research of karst groundwater, groundwater supply (research and tapping), research for the „construction · OoT rehabilitation of hydrotechnical facilities in karst, design and construction of hydrogeological facilities (boreholes, wells and tapping structures), special speleological and ...
    ... been the center of interest of hydrogeologists, karst investigations have expanded to a larger scale due to numerous projects that included the construction of large and medium-sized dams in the country and abroad. Several such dams were built (Herzegovina, Montenegro) and for the first-time successful ...

  • Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation

    Maja Franković, Nevenka Novaković, Vesna Matović (2015)
    The Dark Gate is the monument of culture, part of the cultural and historical complex of the Belgrade Fortress. It is constructed of limestone blocks that after 270 years of exposure to environmental conditions and different anthropogenic influences show wide ranges of decay forms. During 2007, detail registration of all built limestone microfacies and weathering forms was done using tools of monument mapping. A correlation scheme ‘‘intensity– damage category’’ was made according to the type, intensity, and distribution of ...
    Krečnjak, mapiranje, Indeks raspadanja, brzina raspadanja, progresija
    ... part of the same-named bastion, which was partially destroyed when the nearby boulevard was built (Fig. 1). The exact period or the start of construction is uncon- firmed, but it is documented that it was built during the 6183 Turkish occupation and after 1739 based on the data from the Turkish ...
    ... observation in situ and microscopic microfacial analyses on built stone sam- ples reveal that three facies type of limestone were used for construction of the Dark Gate. The rocks are differentiated according to macroscopic visible component, fabric and @ Springer Environ Earth Sci (2015) ...
    ... which enables water to penetrate into the inner parts of blocks. Pore communications and their size enable water circulation through all gate construction not only from slope, but also groundwater and rain Wwater, tOO (Fig. 7b). Percolating rain water in sheltered stone blocks is related to the ...

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... on is necessary for the classification of municipal waste. Besides, knowledge of grain size distribution is particularly important in the construction of facilities for municipal waste classification within separation and transfer stations. Grain size distribution analysis separates fine ...
    ... period 2011—2020. REFERENCES 1) De Haan, E.J. (1997): An overview of the mechanical behavior of peats and organic soils and some appropriate construction techniques, Proceedings of Conference on Recent 4dvances in Soft Soil Engineering, Huat & Bahia, Sarawak, 17-20. 2) European Commission - ...

  • 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

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... decision was made: to rehabilitate the most essential parts of the dredge, including the bucket wheel and the gearbox. However, the selection and construction of the excavator parts were performed on the ground of available laboratory data for digging resistance. The data itself was determined by the testing ...
    ... decision was made: to rehabilitate the most essential parts of the dredge, including the bucket wheel and the gearbox. However, the selection and construction of the excavator parts were performed on the ground of available laboratory data for digging resistance. The data itself was determined by the testing ...
    ... Bucket-wheel dredge “Kovin I” with bucket wheel type UCW-450 has been used for over 25 years for underwater coal mining [20]. The selection and construction of the excavator parts were performed based on available laboratory data for cutting resistance, which was determined by the standard wedge testing ...

  • Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays

    Vladimir Simić, Dragana Životić, Zoran Miladinović (2021)
    Management, Monitoring, Policy and Law,Nature and Landscape Conservation
    ... across the EU it takes on average 10 years to finalize this process [62]. Spatial planning in Serbia is regulated by the Law on Planning and Construction [63] and includes three levels: national, regional, and municipal. The most important for the mining sector is the municipal level of spatial ...
    ... person has to declare those reserves as inferred re- sources. The other extreme, typical for common clay deposits and deposits of aggregate rocks, construction sand and gravel, is that formal C1 category of Serbian reserves corre- lates perfectly with measured resources and, finally, with proven reserves ...
    ... gov.rs/vi- sios/Srbija (accessed on 16 April 2021). 58. Republic of Serbia, Autonomous Province of Vojvodina, Provincial Secretariat for Energy, Construction and Traffic, Geological Map of Exploration and Exploitation Permits. Available online: http://185.166.125.154/geoliep/ (accessed on 16 April 2021) ...

  • 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
    ... failure and downtime due to failures in the subsystem “construction”. Subsystem Failure of Element Number of Failures Time to Failure (h) Time to Repair (h) C o n st ru ct io n Belt construction bending 2 553, 1792 3, 7 Belt construction fracture 6 90, 192, 230, 295, 305, 1276 2, 4, 4, 5, 6, ...
    ... engineering system (the crushing machine) was divided into eight subsystems: the hydraulic, engine, electrical, crushing, screening, transport, construction, and feeder subsystems. For each crushing machine subsystem, the indicators were analyzed and the level of risk was assessed for five characteristic ...
    ... Crushing 0.15046 0.19357 0.25574 0.23666 0.16357 Screening 0.14622 0.20042 0.30672 0.20042 0.14622 Transport 0.14622 0.20042 0.30672 0.20042 0.14622 Construction 0.15314 0.24440 0.26656 0.19779 0.13811 Feeder 0.14945 0.23797 0.27715 0.19908 0.13635 The failure risk level of the subsystem was determined on ...

  • 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
    ... blocks B1 and B2, the final phase of flue gas desulfurization plant construction is in progress, with the aim to reduce emissions of sulfur and nitrogen oxide below 200 mg/Nm3 [15–17]. Preparations have started for the construction of facilities for wastewater treatment. The Investment-technical doc ...
    ... documentation and Feasibility Study is being prepared, with the preliminary design for construction of wastewater treatment plant “Kostolac B”, for blocks B1, B2, and future block B3 with 350 MW of power [15]. In the area of soil protection in the TPP “Kostolac A”, the current project is “Replacement of ...
    ... S.C. Challenges in the Development and Use of Ecological Indicators. Ecol. Indic. 2001, 1, 3–10. [CrossRef] 12. Zlatanovic, M.; Matejevic, B. Construction Technology and Organization—A Collection of Solved Problems with Excerpts From the Theory; Faculty of Civil Engineering and Architecture, Department ...

  • 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
    ... bound mixtures // (2003). [21] Šešlija, M.; Stojanović, M.; Radović, N.; Radonjanin, V.; Malešev, M. Use of fly ash for embankment construction in road construction with and without binders. // Proceedings of the 5th Int. conference Civil Engineering - Science and Practice / Žabljak, 2014, pp. 1133-1138 ...
    ... some oxides that are provided standard. The chemical properties of fly ash are the most important indicators to assessing their suitability as construction materials or as raw materials for the production of building materials. The results were compared with the average results of previous tests ...

  • Rezultati probnog ispitivanja geotehničkih prenapregnutih sidara u Užicu (Stari grad)

    Vladimir Kovačević (2024)
    Za potrebe izrade završnog rada na četvrtoj godini Rudarsko-geološkog fakulteta, studijskog programa Geotehnika, pod mentorstvom doc. dr Zorana Berisavljevića, odabrana je tema „Rezultati probnog ispitivanja geotehničkih prenapregnutih sidara u Užicu (Stari grad)“. Osnovni metodološki pristup koji je korišćen za rešavanje postavljenog problema predstavlja kabinetsko istraživanje dostupne dokumentacije, analiza i interpretacija rezultata izvedenih geoloških,geotehničkih i geomehaničkih istraživanja. Predstavljene su osnovne informacije,karakteristike i upotreba prednapregnutih geotehničkih sidara.Analiziran je tok testiranja granične nosivosti prednapregnutih sidara. Na osnovu izvršenih geotehničkih istraživanja terena i ispitivanja ...
    geotehnička istraživanja, prednapregnuta sidra, nosivost sidra, standard SIA V 191
    ... Užice |s / TPAAYSUL Onuc nocna: TeoMexaHMukuM M reoTexXHMukM McTpa)X)HwWM panoBuM 3a noTpeče varpanMH»e MocTa Ha CTEPOM rpany Job description: Construction of bridge in Uzice Old town - Geotechnical investigations TexH\vuka nokyMeHTauuja: rJEOTEXHI/MUKVI EJTJABOPAT 'asa npojekra: nrnyn3M Technical ...
    ... Vukole Dabića 1 - 3, Užice Onuc nocna: TeoMexaHMukW M reoTexXHMukM McTpaXHM panoBM 3a noTpe6e M3rpanH»e MocTa Ha CTapoM rpany Job description: Construction of bridge in Uzice Old town - Geotechnical investigations Maaa npojekra: Design stage: PrIVr13\ TexH\Muka nokyMeHTauyuja: rFEFOTEXH/UKVI EJJABOPAT ...
    ... Dabića 1 - 3, Užice Onuc nocna: TeoMexaHMukuM M reoTexXHMukM McTpa)X)HwWM panoBuM 3a no·rpeče varpanMH»e MocTa Ha C'rapoul rpany Job description: Construction of bridge in Uzice Old town - Geotechnical investigations TexH\vuka nokyMeHTauuja: rJEOTEXHI/MUKVI EJTJABOPAT asa nPojeKTa rprn3M Technical ...

  • The Importance of Detailed Groundwater Monitoring for Underground Structure in Karst (Case Study: HPP Pirot, Southeastern Serbia)

    Marina Čokorilo Ilić, Ana Mladenović, Marina Ćuk, Igor Jemcov (2019)
    Geography, Planning and Development,Aquatic Science,Biochemistry,Water Science and Technology
    ... with regard to tunnel stability and water containment [1]. Anthropogenic interventions in such terrains can cause numerous environmental problems, like changes in water quality and quantity, and in groundwater and surface water regimes [2]. These changes occur, not only in the construction phase, but also ...
    ... with regard to tunnel stability and water containment [1]. Anthropogenic interventions in such terrains can cause numerous environmental problems, like changes in water quality and quantity, and in groundwater and surface water regimes [2]. These changes occur, not only in the construction phase, but also ...
    ... operating regime of the tunnel (whether it is in or of operation—online or offline). While the tunnel was operating (online), monitoring was conducted at observation wells along the tunnel (approx 15 m distant), a control gate (water losses), springs, and a stream in the vicinity of the tunnel. Areas of the potential ...

  • Репозиторијум дигиталних идентификатора објеката – доиФил: изградња, стање и перспективе

    Милош Утвић, Михаило Шкорић (2017)
    Филолошки факултет Универзитета у Београду је крајем јула 2015. године склопио уговор са агенцијом Crossref и тиме стекао право да својим публикацијама додељује дигитални идентификатор објекта (DOI), као и публикацијама других издавача које заступа. Истовремено, у склопу уговора, Филолошки факултет је развио репозиторијум доиФил који за све регистроване публикације чува њихове библиографске метаподатке, хипервезу ка комплетном тексту и сам DOI. После припремних радњи и разраде процеса на којима је заснован рад репозиторијума, у новембру 2016. године је репозиторијум доиФил ...
    DOI, дигитални идентификатор објекта, Crossref, Филолошки факултет
    ... Faculty of Philology Mihailo Škorić University of Belgrade Faculty of Mining and Geology REPOSITORY OF DIGITAL OBJECT IDENTIFIERS - DOIFIL : THE CONSTRUCTION, STATE AND PROSPECTS Summary University of Belgrade, Faculty of Philology, became a member of The Publishers International Linking Association ...
    ... of Library and Information Science. The anniversary of teaching library science at university level in Serbia is an opportunity to discuss the construction, state and perspectives of the repository doiFil. Keywords: DOI, digital object identifier, Crossref, Faculty of Philology. ...

  • Geostatički proračuni sanacije klizišta šipovima

    Slobodan Ćorić, Dragoslav Rakić, Dušan Berisavljević (2019)
    U ovom radu su, polazeći od rezultata geotehničkih istraživanja, prikazani geostatički proračuni sanacije klizišta vertikalnim šipovima. Metodologija proračuna je složena, jer podrazumeva interakciju klizišta i stabilizirajućih šipova. Stoga se simultano analiziraju stabilnost klizišta i stabilnost šipova. Prilikom određivanja bočne otpornosti tla oko šipova koristi se metoda Brinč Hansena koja uzima u obzir trodimenzionalne uslove u tlu i može da se primeni u složenim geološkim uslovima koji su česti u Srbiji. Analize stabilnosti klizišta vrše se odgovarajućim metodama granične ravnoteže. ...
    sanacija klizišta, interakcija klizišta i šipa, bočna otpornost šipova, stabilnost klizišta i šipova
    ... Poulos, H. G. and Davis, E. H.: Pile foundation analysis and design, John Wiley & Sons, New York, 1980. Tomlinson, M. J.: Foundation design and construction, The Pitman book, London, 1980. View publication statsView publication stats ...