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2836 items

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... at an angle of 40 to 50°. Varia- tions of the dip directions of bedding planes and their dip angles are due to the deformed state of the whole unit. Deformational fabrics are composed of a series of cleavages which significantly disrupt the primary sedimentary structures. Development of seve- ral ...
    ... tectonic controls of lacustrine hyperpycnite origination in the Late Triassic Ordos Basin, central China: Implications for unconventional petroleum development.– AAPG Bulletin, 101/1, 95–117. doi: 10.1306/06101615095 ZAVALA, C., ARCURI, M. & BLANCO VALIENTE, L. (2012): The importance of plant remains ...
    ... modes of transport was limited by the insufficient quantity of the obtained sedimentological samples. This led to the use of fossils as an in- dicator of hyperpycnal transport. The presented study could be used as a starting point for a more detailed petrological analysis of the provenance of the ...

  • 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
    ... tensile strength (Brazilian experiment) applies primarily to stabilized bearing layers. The development of this method allows the parameter assessment, such as tensile strength, tensile deformation, modulus of elasticity, Poisson's ratio, at fail and other mechanical properties. For the experiment ...
    ... - the modulus of elasticity. The aim of research is to test the possibility of using the fly ash from PPNT A for making elements of road structures (top and bottom layers of the road). 2 Experimental 2.1 Mineral properties of fly ash Mineral properties of samples of fly ash from thermal ...
    ... the addition of a binder hydrated lime and cement. Tests were performed after 7 and 28 days in a humid environment with different amounts of extra binder: - samples without the addition of binders, - a sample with the addition of 2 % of binder, - a sample with the addition of 4 % of binder, - ...

  • Geotechnical zoning of the terrain along the first section of E-80 highway in Serbia – SEETO route 7

    Dragoslav Rakić, Zoran Berisavljević, Irena Basarić, Snežana Bogdanović, Jovana Janković (2019)
    Part of E-80 highway that passes through Serbia (from the city of Nis to the administrative border Merdare) is 77 km long. The highway is divided into two sections: the first from Nis to Plocnik (39.4 km long) and the second from Plocnik to the administrative border with Kosovo. The route is designed through a typical plain and hilly terrain in which different geological units are dominant: crystalline schists, neogene sediments of foothills and quaternary sediments in the valley ...
    ... on of design parameters of seismicity for structures, forming of engineering geological map of limitations. 2 ENGINEERING GEOLOGICAL CONDITIONS IN THE ZONE OF HIGHWAY ROUTE Regional rupture pattern indicates two systems of perpendicular structures that form a block structure of investigated ...
    ... embankments height of 0.5 to 1.5 m (locally, in the case of bridges approaches, embankments of higher heights are designed). The groundwater level is at depth over 5.0 m, and only in the zones of smaller streams is at depth of about 2.0 m. In geotechnical sense, most of the route is estimated ...
    ... Due to the construction of larger number of bridges, and because this section is built of solid rock masses, most of the section is characterized as favourable - A (around 70%), and 27% as conditionally favourable – B. Due to the height of embankments and use of geosynthetics for their ...

  • 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
    ... 3. Drying shrinkage development of mortar mixtures. – – Figure 4. Adhesion between mortar and a concrete substrate. Minerals 2021, 11, 925 9 of 16 – – Figure 5. Flexural strength of concrete mixtures (28 days). – – – – Figure 6. Compressive strength of concrete mixtures. When testing ...
    ... published version of the manuscript. Funding: This research received no external funding. Data Availability Statement: The study do not report any data. Acknowledgments: This work was supported by the Ministry of Education, Science and Techno- logical Development of the Republic of Serbia through the ...
    ... H.N.; Lee, H.K. Carbonation of calcium sulfoaluminate cement blended with blast furnace slag. Cem. Concr. Compos 2021, 118, 103918. [CrossRef] 25. Liao, Y.; Jiang, G.; Wang, K.; Al Qunaynah, S.; Yuan, W. Effect of steel slag on the hydration and strength development of calcium sulfoalumi-nate cement ...

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

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... strength in order to create an dynamic model of anisotropy investigation. Acknowledgement This paper is a part of the Projects ТR 36014 and ТR 33029 under the auspices of the Ministry of Education, Science and Technological Development, Republic of Serbia. REFERENCES ALEFELD G. and MAYER ...
    ... same for both approaches of determining the degree of anisotropy. The existence of that high similarity clearly indicates that it is an isotropic medium. During modelling of the anisotropic rock masses, knowing of the quantitative indicators of anisotropy would be of great use for creating reliable ...
    ... indicators of anisotropy: anisotropy coefficient K and degree of anisotropy D. The following section provides a detailed description of the concept of calculation and formulas. There are several ways to determine the degree of anisotropy and anisotropy coefficient. Our investigation of the degree ...

  • Geotechnical conditions of “Debelo brdo” tunnel construction on the highway E-80: Nis-Merdare-Pristina (“Peace Highway”)

    Dragoslav Rakić, Irena Basarić Ikodinović, Radojica Lapčević, Dragan Lukić (2024)
    The construction of the highway E-80 has begun in Serbia, which will represent the traffic hub of the Western Balkans and will be part of the main regional transport network of Southeast Europe. Its total length through Serbia is 77 km, and one part of the route is designed through a typical plain terrain, while a larger part of the route passes through hilly terrain. The construction of the tunnel “Debelo brdo” is planned partly in an open cut ...
    „Debelo brdo“ tunnel, temporary slopes, open cut excavation, tunnel excavation, piles

  • The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>

    Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić (2008)
    The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...
    Пепсин, алуминијум, кинетика, активација, електрофоретска мобилност
    ... ions was of partial non-competitive type. Acknowledgements Especial thanks are due to N. Miljevic, Ph. D. and M. Stoiljkovic, Ph. D. from Vinca- Institute of Nuclear Sciences, Belgrade, Serbia for valuable discussions during the development of this paper. "This study is a part of Project No ...
    ... Activation of pepsin by Al * ions; The intercepts on the abscissa of the primary plot of [Hb]/V against reciprocal of activator concentrations provide the values of Aso used to obtain the plots of 1/Aso against vo/V shown in the inset. B, curve 2) contain characteristic bands of haemo- globin ...
    ... enzyme of gastric juice and as the best understood of 215 N -_ this family of proteinases it was used as a model to Asp located at· the centre of the b{ndmg cleft study related enzymes. As all aspartic proteinases between the domains. One of two Asp residues has to pepsin molecule consist of two ...

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... Pavloudakis, F. and Agioutantis, Z., 2001. Development of a software tool for the prediction of the coal blending efficiency in longitudinal stockpiles. In Proc. 17th Int. Mining Congress and Exhibition of Turkey, Ankara, Turkey, June, Chamber of Mining Engineers of Turkey. 6. Robinson, G.K., 2004 ...
    ... inability to achieve the required results at the pit, without stifling the capacities and with a technologically normal development of the pit. Therefore, in all dubious situations use of a new homogenization stockyard with crushed coal is planned. The considerations relating to stockyard sizing have ...
    ... length, width and height of the stacked coal are sized. In these considerations the problem of self-inflaming of coal, availability of space, availability of funding, etc., are not taken into account. Only the technical and technological parameters affecting the size of the pile and stockyard are ...

  • Split-Desktop software for the analysis of fragment size distribution of blasted rock mass

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)
    Drobljenje stena je najvažniji pokazatelj u proceni efekata miniranja pri proizvodnom miniranju u površinskoj eksploataciji. Stepen drobljenja stena ima veliki uticaj na efikasnost daljih operacija utovara, transporta, drobljenja i mlevenja. Optimalno drobljenje stena pri proizvodnom miniranju utiče na smanjenje ukupnih troškova proizvodnje. Stoga je pouzdana procena veličine drobljenja odminirane stenske mase veoma važno pitanje, ne samo u operacijama miniranja, već i u rudarskoj proizvodnji. Za predviđanje distribucije veličine komada odminirane stenske mase postoje različiti empirijski modeli. KUZ-RAM model omogućava ...
    Split-Desktop softver, drobljenje stena, miniranje, analiza, digitalna obrada fotografija

  • Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

    Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)
    The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...
    otpadne vode, toplotna pumpa, daljinsko grejanje, simulacija

  • Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm

    Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić (2021)
    Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems that may arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while ...
    Energija,energetski inženjering i elektroenergetska tehnologija,obnovljivi izvori energije, održivost i životna sredina,električni i elektronski inženjering,kontrola i optimizacija,inženjering
    ... arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while re- specting ...
    ... practice and spatial development is given great attention and it is also established through European legislation [13,14]. Today, SEA is one of the most important instruments for implementing the principles of sustainable development in spatial development policy. The application of SEA in spa- tial ...
    ... tial development planning, through various development documents, makes it possible today to consider the consequences of proposed development concepts and spatial changes in the early conceptual stages of a planning proposal, while respecting the capac- ity of the space and involving the public in ...

  • 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
    ... Overview of the Techniques for Selecting Optimal Artificial Lift Methods Several authors have been involved in development of techniques for selecting optimal artificial lift methods. In 1981, Buford Neely and a group of authors published summaries of panel discussions on the topic of Selection of an ...
    ... agreed to the published version of the manuscript. Funding: This research received no external funding. Acknowledgments: This article is the result of the Project No. 33001 financed by the Ministry of Education, Science and Technological Development of the Republic of Serbia. We thank the Ministry for ...
    ... sistem analize. MsC. Thesis, University of Belgrade, Beograd, Serbia, 2008. 26. Elhaddad, E.E. New Model for Achieving Optimum Production at Amal Oilfield. Ph.D. Thesis, University of Belgrade, Beograd, Serbia, 16 April 2015. 27. Aliyev, E. Development of Expert System for Artificial Lift Selection ...

  • 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

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... funded by the Ministry of Education and Science of the Republic of Serbia within the framework of Programme of research in the field of technological development projects TR 33039 and TR 33025. Acknowledgments: This paper was realized as a part of the project “Improvement of Lignite Opencast Technology ...
    ... Programme of research in the field of technological development for the period 2011–2019. Conflicts of Interest: The authors declare no conflict of interest. References 1. Billings, R.; Scherer, L. The Effects of response mode and importance on decision-making strategies: Judgment versus choice. Organ. Behav ...
    ... Models, Methods, Concepts & Applications of the Analytic Hierarchy Process; Springer Science & Business Media: New York, NY, USA, 2012; Volume 175. 4. Mohamadibadi, H.S.; Tichkowsky, G.; Kumar, A. Development of a Multi-Criteria Assessment Model for Ranking of Renewable and Non-Renewable Transportation ...

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • History of meteorite donations to the Collection of Minerals and Rocks of the University of Belgrade, Faculty of Mining and Geology (Serbia)

    Alena Zdravković, Maja Milošević, Kristina Šarić, Ivana Jelić, Ana Černok (2021)
    ... Unfortunately, most of this collection went missing during the World War I (Jović, 2002). However, a rather quick development of geological sciences in Serbia by the end of the XIX century helped in preserving the original meteorite collections. Due to the personal effort of the internationally ...
    ... History of meteorite donations to the Collection of Minerals and Rocks of the University of Belgrade, Faculty of Mining and Geology (Serbia) Alena Zdravković1, Maja Milošević1, Kristina Šarić1, Ivana Jelić2, Ana Černok3 1Faculty of Mining and Geology, University of Belgrade, Belgrade ...
    ... principal collection of the Mineralogical Museum of the Great School of Belgrade was divided into two and all the meteorite samples of the Serbian recorded falls became the inventory of the newly established Natural History Museum in Belgrade. Fortunately, new collections of minerals and meteorites ...

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • 2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja
    ... the housing development for 900 to 2000 people built on the most unsanitary locality in Belgrade (housing development “Deponija”). In the beginning of the year 1960, under the jurisdiction of the former Federal executive council of SFRY, “Ada Huja” became a waste dump site. A variety of birds was ...
    ... variety of cancer types. Housing development “Deponija”, which is proclaimed to be the most unattractive housing settlement in Belgrade, is located near the former waste dump site “Ada Huja”. The lack of statistical reports on the health condition of the people who live in the near vicinity of the waste ...
    ... June 3, 2019 Abstract: Rapid yearly technology development has enabled the possibility of renewing already acquisitioned data using new and improved software capabilities. The potential to gather 3D inversion results from 2D acquisitioned data is one of many new software options that were not available ...