Претрага
580 items
-
Development of the Cost-Based Model for Monitoring the Lifetime of the Earth Moving Machines
This paper presents the model for the identification of reference points on the lifetime curve of engineering systems. This curve commonly represents the increase and decline of failure in relation to time. A direct correlation between failure rate and costs is assumed in this paper, therefore, statistical and empirical analysis of costs provided reference points. This approach is used for positioning stages of the engineering system’s lifetime with a minimal number of failures and costs, regardless of whether these ...Electrical and Electronic Engineering,Industrial and Manufacturing Engineering, Control and Optimization, Mechanical Engineering, Computer Science (miscellaneous), Control and Systems EngineeringUgljesa Bugarić, Milos Tanasijević, Stevan Djenadić, Dragan Ignjatović, Ivan Janković. "Development of the Cost-Based Model for Monitoring the Lifetime of the Earth Moving Machines" in Machines, MDPI AG (2022). https://doi.org/10.3390/machines10110995
-
Laboratory testing of fly ash
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... by mechanical properties are the most important in the application of ash as road-building material. Mechanical properties of fly ash have been determined on the test samples. The experiments were done based on the standards that are in use in the European Union. The following mechanical tests ...
... in three ways: by the content of reactive silica (SiO2), according to the granulometric composition and mechanical properties. Pozzolanic properties of the fly ash determined by the mechanical properties are the most important in the application of ash as road-building material. Depending on the ...
... 481 000 L 6 % 440 000 C 6 % 374 000 L 6 % 469 000 C 6 % 312 000 L 6 % 455 000 C 6 % 338 000 3.5.4 Dependencies between the mechanical properties After the mechanical properties test completion according to EN standards, the dependencies were made between: - the uniaxial compressive strength ...Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić. "Laboratory testing of fly ash" in Tehnički vijesnik (2016). https://doi.org/10.17559/TV-20150317171035
-
Mesozoic carbonate rocks in Serbia used as dimension stone
Vesna Matović, Tijana Vojnović Ćalić (2016)The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...... on. Keywords Dimension stone · Mesozoic · Limestone · Serbia · Petrography · Physico-mechanical properties Introduction Stone was and still is the most important building material in civil engineering; it is used in the architecture of old cities or modern buildings, in monument heritage ...
... properties of observed limestones As shown in the results of the physico-mechanical tests (Table 1) and basic statistical analyses (Fig. 4), all of the limestone samples exhibit relatively uniform values of mechanical properties, but some heterogeneity in terms of physical properties. Because ...
... detailed, comprehensive investigation. Therefore, this research is primarily concerned with the examination of their petrological and physico-mechanical properties in order to propose thcir scope of application further as dimension stone. According to the petrological features, different carbonate ...Vesna Matović, Tijana Vojnović Ćalić. "Mesozoic carbonate rocks in Serbia used as dimension stone" in Bulletin of Engineering Geology and the Environment, Springer Science and Business Media LLC (2016). https://doi.org/10.1007/s10064-015-0722-0
-
Design of a sucker rod pumping system
Ana Ponoćko (2024)For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...... secured either mechanically or by friction. Seats can be of mechanical or "cup" type. For temperatures above 121.11 *C, only mechanical seats are used, and it is clear that such pumps are installed in the wells of the "T" oil field. In mechanical seating, sealing is ensured by a ring that fits into the ...
... supplied to continue extraction. If fluid production is achieved using additional energy, this method of exploitation is called a mechanical method. Today, the mechanical methods used for oil reservoir exploitation worldwide include [1,2|: 1. Sucker Rod Pumps 2. Continuous or intermittent gas lift ...
... production, rod pumps have been the first and, in many cases, the only choice when it comes to mechanical methods of exploitation. This is why rod pumping is the oldest and most widely used type of mechanical method worldwide, with approximately two-thirds of all production wells globally employing ...Ana Ponoćko. Design of a sucker rod pumping system, 2024
-
Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications
Darko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic (2024)This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...примарне сировине, минералогија, физичко-механичка својства, технолошка својства, наука о материјалимаDarko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic. "Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications" in Science of Sintering, Bor, August 2024, National Library of Serbia (2024). https://doi.org/10.2298/SOS240701029B
-
Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete
Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija... concrete production. Detailed physical–mechanical characterization was performed on the mortar and concrete samples according to standard procedures. Test results indicated that the replacement of cement with slag and silica fumes reduces the physical and mechanical properties of mortar and concrete, but ...
... concrete production. Detailed physical—mechanical characterization was performed on the mortar and concrete samples according to standard procedures. Test results indicated that the replacement of cement with slag and silica fumes reduces the physical and mechanical properties of mortar and concrete, but ...
... atmosphere, with a flow of 16 cm3/min. The mass of the sample was 15 mg. 3. Results and Discussion 3.1. Physical–Mechanical Characterization of Mortar and Concrete Results of the physical–mechanical characterization of samples are given in Tables 4 and 5 and Figures 1–6. Table 4. Physical properties of fresh ...Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović . "Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete" in Minerals, MDPI (2021). https://doi.org/10.3390/min11090925
-
Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry
Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalizationSteven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti. "Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945979
-
The Importance of the Existing Engineering Geological Conditions During the Building Construction on the Terrain Affected by Sliding
Rakić Dragoslav, Berisavljević Zoran, Basarić Irena, Đurić Uroš. "The Importance of the Existing Engineering Geological Conditions During the Building Construction on the Terrain Affected by Sliding" in International IAEG Congres – Engineering Geology for Society and Territory – Applied Geology for Major Engineering Projects 6, Torino, Italy:IAEG - International Association for Engineering Geology and the Environment (2014): 285-289. https://doi.org/10.1007/978-3-319-09060-3.
-
Contribution to the geotechnical classification of municipal waste landfills in Serbia
Management, Monitoring, Policy and Law,Nature and Landscape Conservation,Geochemistry and Petrology,Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental EngineeringDragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić. "Contribution to the geotechnical classification of municipal waste landfills in Serbia" in Environmental Geotechnics, Thomas Telford Ltd. (2018). https://doi.org/10.1680/jenge.18.00028
-
Applying terrestrial laser scanning in geotechnical engineering
Bogdanović Snežana, Marjanović Miloš, Abolmasov Biljana, Đurić Uroš, Pejić Marko. "Applying terrestrial laser scanning in geotechnical engineering" in Proceedings of 4th International Symposium of Macedonian Association for Geotechnics 1 no. 1, Struga, FYROM:Faculty of Civil Engineering, Skopje, Republic of Macedonia (2014): 337-342
-
A new analytical method for determination of discharge duration in tunnels subjected to groundwater inrush
Mohsen Golian, Ebrahim Sharifi Teshnizi, Mario Parise, Josip Terzić, Sasa Milanović, Vesna Ristić Vakanjac, Masoud Mahdad, Mehdi Abbasi, Hossein Taghikhani, Habib Saadat (2021)Mohsen Golian, Ebrahim Sharifi Teshnizi, Mario Parise, Josip Terzić, Sasa Milanović, Vesna Ristić Vakanjac, Masoud Mahdad, Mehdi Abbasi, Hossein Taghikhani, Habib Saadat. "A new analytical method for determination of discharge duration in tunnels subjected to groundwater inrush" in Bulletin of Engineering Geology and the Environment, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10064-021-02140-6
-
Quantitative landslide risk assessment in the city of Tuzla
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 – ...... extracted from the engineering geological map at 1:10000 scale and included the following separate geological proxies: engineering geological units, hydrogeological units and distance to hydrogeological boundaries. Engineering geological units were classified on the basis of engineering properties. All ...
... so that each class gives a new sub-variable. For instance, engineering geological units were segregated into 9 sub-variables (9 new rasters), that are binary (1 = observed engineering geological class, 0 = union of all other engineering geological classes). Hydrogeological units were classified ...
... dr.rgf.bg.ac.rs INTERNATIONAL SOCIETY FOR SOIL MECHANICS AND GEOTECHNICAL ENGINEERING This paper was downloaded from the Online Library of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE). The library is available here: https://www.issmge.org/publication ...Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović. "Quantitative landslide risk assessment in the city of Tuzla" in SCG-Xiii International Symposium on Landslides. Cartagena, Colombia- February 22-26, 2021, International Society for Soil Mechanics and Geotechnical Engineering (2021)
-
A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers
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 ...Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić. "A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers" in International Journal of Industrial Engineering: Theory, Applications and Practice (2019)
-
Facing Engineering Problems in the Fragile Karst Environment
Parise Mario, Closson Damien, Gutierrez Francisco, Stevanović Zoran. "Facing Engineering Problems in the Fragile Karst Environment" in Engineering Geology for Society and Territory - Volume 5, Proceedings of the XII IAEG Congress, Torino 2014 5, :Springer International (2014): 479-482. https://doi.org/10.1007/978-3-319-09048-1_92
-
Environmental Aspects of Proposed Engineering Solution for Inter-basin Transfer in East Herzegovina
Čokorilo Marina, Stevanović Zoran, Ristić-Vakanjac Vesna. "Environmental Aspects of Proposed Engineering Solution for Inter-basin Transfer in East Herzegovina" in Engineering Geology for Society and Territory - Volume 5, Proceedings of the XII IAEG Congress, Torino 2014 5, :Springer International (2014): 515-519. https://doi.org/10.1007/978-3-319-09048-1_99
-
Coherent oscillations in minimal neural network of excitable systems induced by time delay
Vasović Nebojša, Burić Nikola, Grozdanović Ines, Todorović Kristina, Samčović Andreja. "Coherent oscillations in minimal neural network of excitable systems induced by time delay" in Proceedings of 11th Symposium on Neural Network Appliciations in electrical Engineering, (ELEVENTH SYMPOSIUM ON NEURAL NETWORK APPLICATIONS IN ELECTRICAL ENGINEERING (NEUREL 2012)), Beograd:Faculy of Electrical Engineering (2012): 35-39. https://doi.org/10.1109/NEUREL.2012.6419957
-
The analysis of landslide dynamics based on automated GNSS monitoring
Abolmasov Biljana, Pejić Marko, Šušić Vladimir. "The analysis of landslide dynamics based on automated GNSS monitoring" in Proceeding of the 1st Regional Symposium on Landslides in the Adriatic-Balkan Region - 1st ReSyLAB 2013 1 no. 1, Zagreb, Croatia:Univesrity of Zagreb, Faculty of Minig, geology and Petroleum Engineering and University of Rijeka, Faculty for Civil Engineering (2015): 187-191
-
Natural radioactivity of groundwater in Serbia
Paleontology, Stratigraphy, Economic Geology, Geochemistry and Petrology, Geology, Geophysics, Geotechnical Engineering and Engineering GeologyMarina Ćuk, Petar Papić, Jana Stojković. "Natural radioactivity of groundwater in Serbia" in Annales geologiques de la Peninsule balkanique, National Library of Serbia (2014). https://doi.org/10.2298/GABP1374063C
-
The Crystal Structure and Crystal Chemistry of Mineral-like Cd5(VO4)2(OH)4, a Novel Isomorph of Arsenoclasite and Gatehouseite
Ljiljana Karanović, Tamara Ðorđević (2022)Ljiljana Karanović, Tamara Ðorđević. "The Crystal Structure and Crystal Chemistry of Mineral-like Cd5(VO4)2(OH)4, a Novel Isomorph of Arsenoclasite and Gatehouseite" in Minerals, MDPI AG (2022). https://doi.org/10.3390/min12121601
-
Depth geological relations of the wider area of Belgrade - based on the wells and geophysical data
Đorđe Marinović, Ljupko Rundić (2020)Paleontology, Stratigraphy, Economic Geology, Geochemistry and Petrology, Geology, Geophysics, Geotechnical Engineering and Engineering GeologyĐorđe Marinović, Ljupko Rundić. "Depth geological relations of the wider area of Belgrade - based on the wells and geophysical data" in Annales geologiques de la Peninsule balkanique (2020). https://doi.org/10.2298/GABP201030009M