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Упит dcterms_subject_txt:vertical contact

178 items

  • Synergy between the mineral deposit exploration and geothermal resources assessment on the example of "Valjevo" boron and lithium deposit in Serbia

    Nebojša Atanacković, Vladimir Živanović, Ana Vranješ, Sava Magazinović, Marinko Toljić, Ana Arifović, Branislav Potić (2023)
    Exploration of mineral deposits involves a collection of vast data sets on geological characteristics of the area. These data can largely contribute to the assessment of the geothermal potential, which can lead to an increase in the share of geothermal resources in the energy mix of the extractive industry and the local community. On the example of the "Valjevo" B-Li deposit, data on structural settings and previous hydrogeological investigations were combined with the results of resource drilling and geophysical ...
    Geothermal assessment, Mineral deposit exploration, Geothermal potential, Serbia
    ... Triassic carbonate reservoir were estimated at the base of the Neogene sediment sequence and as maximal expected temperatures. The temperatures at the contact of the Triassic reservoir with the Neogene cover are calculated as a product of the values of geothermal gradients of the Miocene sediments and their ...

  • Analysis and visualization of geophysical well-logging data from closely spaced boreholes

    Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov (2024)
    Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...
    well-logging in karst, water loss, data correlation, data fusion
    ... MKA CEBEPHA MAKEJIOHMHJA H3PABOTEHA BP3 OCHOBA HA HOBH FEO0DH3HUKH TIOJIATOILUM Hosuua Cmoanuk, Heuua 4n0o6 FAULT TYPE ASSESSMENT BASED ON VERTICAL GRAVITY GRADIENT ANOMALIES – ADVANTAGES AND LIMITATIONS Jvana Pasiljević, Snežana Ignjatović, Branislav Sretković TFEOTEPMAJIEH IIOTEHIIMJAJI ...
    ... unit (Milanović and Vasić, 2016). The foundation of the dam site is located in an intensely tectonized limestone block (Triassic age), where vertical and subvertical Ilerru Konrpec Ha I eonoaure Ha PenyOnaka CeBepHa MakcynoHuja Fifth Congress of Geologists of the Republic of North Macedonia ...
    ... Dinaric karst. The dam site is located within an asymmetric tectonic trench formed by gravitational activation of the river Drina fault. This is the contact zone of two regional structural-tectonic mega-blocks: the autochthonous East Bosnia-Durmitor unit, and the · overthrust autochthonous Dinaric- ...

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... are stored in a database, such as, formal name of company in the Serbian Business Registers Agency (APR), commonly used name of company, location, contact person, addresses, phones, emails, web site URL, municipality and administrative area, tax identification number, etc. Domain control for specific ...
    ... author classes. Figure 8. Characteristic part of the conceptual model. Note: 1..* stands for relation 1 to many. The class company comprises contact details of all rights owners in the database, while the class terrain_record models notes taken during field visits. The class multimedia is intended ...

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... without contact by detecting infrared rays emitted by an object. They detect infrared radiation and convert it into an electrical signal that represents the object's temperature. Infrared sensors are useful in situations where it is difficult or impossible to measure temperature by contact, such ...
    ... of installation, a position switch is often used. This switch, which features a mercury contact, is mounted on the pump base with a magnet attached to the crank. Its operation allows for reliable contact closure without the presence of moisture once per pumping cycle. In this case, the position ...
    ... tubing. Dynamic loads can result from various factors, among which the most common are: a) Transformation of the motor's rotational motion into vertical translational motion of the sucker rods b) Friction between the sucker rods and the tubing c) Friction between the viscous fluid and various ...

  • Palaeoflora of Kamenica (Pranjani Basin, western Serbia)

    Zorica Lazarević, Ljubica Milovanović, Jelena Milivojević, Ivana Vasiljević (2019)
    Palaeofloras of the Paleogene in Serbia are relatively rare, especially in comparison with floras from Neogene sediments. Most Paleogene phytoas sociations from the territory of Serbia existed in a dry and warm climate. The youngest Paleogene phytoassociation originates from the Pranjani Basin (Western Serbia), locality Kamenica. The age of this palaeoflora is determined as Late Oligocene. This fossil plant assemblage is different from other Paleo gene phytoassociations.The palaeoflora from Kamenica is characterized with leaf imprints larger than in other ...
    макрофлора, млађи олигоцен, Прањански басен, Каменица
    ... and fish have been found in these sediments. The second horizon is a “multicoloured series”,of a depth of about 100 m. There is no ob- served direct contact with the layers of the older horizon. This horizon is composed of sandstones and sands with thin layers of conglomerates, dolo - mitic limestones and ...

  • Development of integrated fuzzy model for mine management optimization

    Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)
    fuzzy logika, višekriterijumsko odlučivanje, ocenjivanje eksperata
    ... of deposit L-29C rends west-to-east (140 m), and the shorter axis is perpendicular (15 m long, apering out to 1 m in the east). The ore body is vertical. T'he deposit is close to he land surface, at a depth of about 100 m, and the quality of the bauxite ore is igh. 'The geologic framework of ...
    ... tectonic transport was most distinct, and found to be rather unfavourable. The most adverse area for underground mining: operations is the zone of contact between the overlying: and underlying, limestones, and especially within the ore deposit and its immediate environment. Experience indicates a ...

  • Groundwater resources for drinking water supply in Serbia´s Southeast Pannonian basin

    Dušan Polomčić, Bojan Hajdin, Marina Ćuk, Petar Papić, Zoran Stevanović (2014)
    menadžment podzemnih voda, monitoring, kvalitet podzemnih voda, bilans, baza podataka

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... UCG involves the preparation of a coal gasification layer and consists of drilling vertical wells or boreholes that follow the coal layer. Pipes are placed into wells up to the top ofthe coal layer, and the contact of the pipe with the surrounding area is cemented, while borehole is not placed in ...
    ... Particular attention should be devoted to the special drilling techniques to facilitate the gasification process. After the boreholes are formed (two vertical wells: one injection and one production), the gasification initiator (oxidant and possibly steam) from the compressor station at high temperature ...
    ... the boreholes, a directed drilling is performed by creating nearly hor- izontal borehole drilled through the coal layer, which connects the vertical boreholes. The first step in drilling involves the drilling: of injection and production bore- holes. In order to achieve the most efficient ...

  • Stratigraphic implications of the Mio-Pliocene geodynamics in the area of Mt. Avala: new evidence from Torlak Hill and Beli Potok (Belgrade, Serbia)

    Ljupko Rundić, Meri Ganić, Slobodan Knežević, Dejan Radivojević, Miloš Radonjić (2019)
    Mt. Avala is located on the southern margin of the Pannonian basin (SPB), a border zone between the uplifted morphostructures of the Dinarides and Carpathian-Balkanides. Similar to the Pannonian basin, tectonostratigraphic evolution of the Mt. Avala area during the last 23 Ma has is characterized by syn- and post-rifting processes as well as tectonic inversion. Here, we present the results of field investigations of the Miocene‒Pliocene dynamics that led to different spatial positions of the same stratigraphic units (e.g. ...
    мио-плиоценска геодинамика, јужни Панонски басен, Авалски и Торлак хорст, Белопоточки трог, Србија
    ... metres away to the northeast, similar Pannonian marls are observed at the surface, at an altitude of about 210 metres. Due to the mentioned observed vertical movements along the block structures, a composite hilly relief with dominant the Torlak Hill and the Beli Potok Valley was formed. 2015). Seven ...
    ... the dissection of the older faults from the F1 system (Fig. 17a) and along these ENE – WSW oriented faults the block structures with pronounced vertical movements were developed (Figs. 20 and 21). Besides this orientation, faults which were reactivated in the late Miocene or neotectonic stage (see ...
    ... Boždarevac (N 44°32ʹ27ʹ ,́ E 20°22ʹ41ʹʹ – Fig. 17a), 20 km southwest of Mt. Avala where there is pinpointed movement along a fault which resulted in vertical displacement (up to 2.5 metres) of the Sarmatian fos- siliferous sands and limestones (Fig. 18). This structure with a measured dip direction and ...

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... tes and receives attributes of the primary key, relations to the metadata, comment, and record author classes. The class company comprises contact details of all titleholders in the database, while the class terrain_record models notes taken during field visits. The class multimedia is intended ...

  • An oilfield in Libya: A new model to enhance waste water disposal

    Dušan Danilović, Vesna Karović Maričić, Nori Elhaddad, Branko Leković (2016)
    нафта, лежишне воде, припрема

  • 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

  • A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)

    Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin (2016)
    ... Distinct spatial (3D) groundwater flow has been noted in the zones of contact of the alluvial sand-and-gravel sediments with the sands of the intermediate aquifer and further down with the sands of the lower aquifer, where there is vertical lithologic stratification and non-uniform horizontal spread of ...
    ... riverine/lacustrine terrace sediments - terrace gravels of various grain sizes in both A hydrogeological model of the open-cast mine… 47 vertical and horizontal directions. Well pumping tests have been conducted and the hydraulic conductivity found to range from 6x10-5 m/s to 6x10-4 m/s. ...
    ... northwest, where they join the sands of the lower aquifer. The grain-size distribution of the intermediate aquifer is relatively homogeneous in both vertical and horizontal directions, the sands are fine-grain and medium-grain, and the hydraulic conductivity is about 1x10-5 m/s. The intermediate aquifer ...

  • Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event

    Barbara V. Radulović, Lubomir S. Metodiev, Neda Motchurova-Dekova, Platon Tchoumatchenco (2023)
    Brachiopods, taxonomy, biostratigraphy, early Toarcian Anoxic Event, Bulgaria

  • Regional Slope Stability Analysis in Landslide Hazard Assessment Context, North Macedonia Example

    Miloš Marjanović, Biljana Abolmasov, Igor Peshevski, James Reeves, Irena Georgievska (2020)

  • The analysis of the geothermal energy capacity for power generation in Serbia

    Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)
    Renewable Energy, Sustainability and the Environment
    ... This system has an additional advantage that the fluid (mostly salt water from ocean or polluted water from aquifer and hot rocks) never comes into contact with the turbine generator units [16]. Binary cycle power plants are a latest development; they operate with the fluid temper- atures as low as ...

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... classified on the basis of their hydrogeological function, thereby additionally highlighting differences between engineering geological units in contact zones, which are considered prone to landslides. Distance to hydrogeological boundary between units of different hydrogeological function is hence ...

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... (N/mm?). Several factors can affect the measured CBR, value, including the falling weight, height offall, size (di- ameter) of the plate, plate contact stress, type and location of deflection transducer, use of load transducer, loading speed, and material strength [9, 10]. The tests with the CBR ...

  • 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

  • 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
    ... ca l sy st e m Electric valve 6 83, 226, 527, 529, 690, 1092 2.2, 4.5, 8, 10.5, 11.6, 15.5 Computer 3 602, 871, 3105 22, 26, 40 Cable break, contact 9 148, 173, 206, 219, 360, 385, 703, 807, 2428 0.5, 0.8, 1, 1, 1.2, 2.5, 3, 3.5, 4 Computer relay 3 538, 1732, 3462 2.2, 6.5, 14 Sensors 10 26 ...
    ... e−(t/10.28)ˆ1.45 1.45 10.28 0.775 2.2 3.8 14.11 15.5 9.32 Computer 22, 26, 40 1 − e−(t/33.15)ˆ2.96 2.96 33.15 0.03 22 29.35 29.89 40 29.6 Cable break, contact 0.5, 0.8, 1, 1, 1.2, 2.5, 3, 3.5, 4 1 − e−(t/2.22)ˆ1.42 1.43 2.22 0.785 0.5 0.83 3.57 4 2.02 Computer relay 2.2, 6.5, 14 1 − e−(t/9.1)ˆ1.04 1.04 ...
    ... 45 0.94 83 113.69 1065.91 1096 594.62 Computer 602, 871, 3105 e−(t/1830.14)ˆ1.04 1.04 1830.14 0.98 602 619.879 3072.8 3105 1495.95 Cable break, contact 148, 173, 206, 219, 360, 385, 703, 807, 2428 e−(t/629.68)ˆ1.1 1.1 629.68 0.95 148 171 2337 2428 608.06 Computer relay 538, 1732, 3462 e−(t/2312 ...