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929 items

  • Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine

    Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)
    Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... three types of machines, in a comparative consideration when the machine is “new”, as well as for the period when the machine is “old”. Identification of the obtained results, for their simpler interpretation, as well as their comparative analysis, will be presented at the end. Energies 2019, 12, 4044 ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs energies Article Development of the Availability Concept ...
    ... engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented ...

  • Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study

    Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2023)
    Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms ...
    Pharmaceutical Science
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs European Journal of Pharmaceutical Sciences 189 (2023) 106557 ...
    ... pyrazolo[4,3-c]quinolin-3-one), have been developed. Deuteration of a methoxy group increased the stability of DK-I-56-1 to O-demethylation, as well as bioavailability and brain exposure. Among all synthesized deuterated derivatives, DK-I-56-1 was selected as the lead ligand for future studies ...
    ... based on its good phar- macological profile and relative ease of synthesis (Knutson et al., 2018). Due to low solubility of DK-I-56-1 in water as well as in many commonly used oils, co-solvents, and organic solvents, nanocrystal dispersion has been chosen as a formulation strategy to further improve ...

  • A comparison between ARIMA, LSTM, ARIMA-LSTM and SSA for cross-border rail freight traffic forecasting: the case of Alpine-Western Balkan Rail Freight Corridor

    Miloš Milenković, Miloš Gligorić, Nebojša Bojović, Zoran Gligorić (2023)
    železnica, prekogranični teretni saobraćaj, ARIMA, LSTM, SSA

  • Hypogene speleogenesis related to porphyry magmatic intrusions and its influence on subsequent karst evolution in the Peruvian high Andes

    Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre (2022)
    Earth-Surface Processes

  • Burnishing Versus Smoothing In Ceramic Surface Finishing: A Sem Study

    Ionescu Corina, Volker Hoeck, Crandell Otis N., Šarić Kristina (2014)
    From the Neolithic up to the present, people have used various methods to improve the surface of ceramic objects. In this study, we look specifically at smoothing and pattern burnishing of ceramics produced today by traditional methods. Optical microscopy and SEM show specific surface changes. Smoothing results in an irregular surface, which causes diffused reflection of light. Burnishing produces an even and compact surface, which causes specular reflection and lustre. The results can be used to infer methods of ...

  • Implementataion of the modern technologies in order to control the drilling an blasting works

    Miljan Gomilanović, Stefan Milanović, Nikola Stanić, Aleksandar Doderović, Nikola Simić (2018)
    U ovom radu prikazanе su mogućnosti primene savremenih tehnologija u oblasti bušenja i miniranja pri površinskoj eksploataciji ležišta mineralnih sirovina, problemi koji se javljaju prilikom izvođenja radova, kao i moguća rešenja i prednosti primene ovih tehnologija.
    bušenje, miniranje, dron

  • A Description of Morphological Features of Serbian: a Revision using Feature System Declaration

    Cvetana Krstev, Ranka Stanković, Vitas Duško (2010)
    In this paper we discuss some well-known morphological descriptions used in various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems on Serbian. We have spotted four groups of problems: the lack of a value for an existing category, the lack of a category, the interdependence of values and categories lacking some description, and the lack of a support for some types of categories. At the same time, various descriptions often describe exactly the same ...
    Morphology, Lexicon, lexical database, Standards for LRs
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs A Description of Morphological Features of Serbian: a Revision ...
    ... Faculty of Mathematics, Belgrade E-mail: cvetana@matf.bg.ac.rs, ranka@rgf.bg.ac.rs, vitas@matf.bg.ac.rs Abstract In this paper we discuss some well-known morphological descriptions used in various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems ...
    ... In order to explicitly formulate relations between categories and their values as well as their applicability we have used feature structure constraints with conditional and bi-conditional tests. For instance, feature structure for ...

  • Developing Students’ Mining and Geology Vocabulary Through Flashcards and L1 in the CLIL Classroom

    Lidija Beko, Ivan Obradović, Ranka Stanković (2015)
    ... a great amount of words (Fitzpatrick, Al- Qarni, and Meara 2008, 239; Nation 2001). Explicit learning with flashcards falls into the category of deep strategies which take more time but ensure greater retention and ease retrieval memory (Nation 2003 22). By making extensive use of dictionaries and ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs The Second International Conference on Teaching English for ...
    ... the use of flashcards and judicious use of L1 in the CLIL environment, our students will have larger amount of quality foreign language input as well as simplified task of learning thousands of items in a meaningful, interesting and effective way. 2. EXPLICIT VOCABULARY TEACHING Research has ...

  • Development of A Business Intelligence Tool For Accident Analysis in Mines

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Uroš Pantelić (2015)
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs 1 DEVELOPMENT OF A BUSINESS ...
    ... crucial role in transmission of knowledge between experienced and new workers in order to ensure the safe, competent integration of new workers as well as the retention of aging workers (Gagné, et al., 2011). KM in a business organization manages both knowledge assets and processes related to ...
    ... (Kolonja et al, 2006). In mine safety it is necessary to follow several attributes related to injuries, perform their multi- dimensional analysis, as well as display data in different forms. Data are presented in the form of OLAP cubes that contains measures and dimensions. Compared with the standard ...

  • 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
    ... part of the basin (the village of Kamenica) and it consists of well cemented conglomerates and breccias lying directly over the peridotite-serpentine rock. above them is a sequence of alternating sandstones, con- glomerates and marlstones. Well preserved remains of fossil plants and fish have been found ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs 53 Palaeoflora of Kamenica (Pranjani Basin, western Serbia) ...
    ... layers of the older horizon. This horizon is composed of sandstones and sands with thin layers of conglomerates, dolo - mitic limestones and shales as well as one interca- lation of tuffits. The third horizon consists of marls and shales (ereMIja et al., 1977). The fossil fish Smerdis minutus (BLaINvILLe) ...

  • Određivanje zbijenosti starog komunalnog otpada

    Jovana Janković, Dragoslav Rakić, Irena Basarić Ikodinović, Tina Đurić (2021)
    Bez obzira na savremene tretmane komunalnog otpada u svetu, u Srbiji je i dalje najčešći vid odlaganja na komunalne deponije, pa zbijanje otpada predstavlja jednu od ključnih faza formiranja deponije. Na ovaj način znatno se smanjuje zapremina otpada, ubrzava proces degradacije i produžava radni vek deponije. Zbog toga su geotehničke karakteristike komunalnog otpada prilikom zbijanja, veoma bitne kako u fazi projektovanja tako i u fazi izgradnje deponije i optimizacije prostora. Tu se pre svega misli na maksimalnu suvu zapreminsku ...
    komunalni otpad, deponija, Proktorov opit, optimalna vlažnost, maksimalna suva zapreminska težina

  • Trans-Lithospheric Diapirism as a Possible Mechanism for Ophiolite Emplacement?

    Nikola Stanković, Taras Gerya, Vladica Cvetković, Vesna Cvetkov (2024)

  • Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike

    Мирослав Црногорац, Душан Даниловић, Лола Томић (2020)
    ... , Advanced Artificial Lift Methods – PE 571 Chapter 1 - Electrical Submersible Pump Introduction, New Mexico Tech University. https://documents.pub/document/advanced-artificial-lift-methods- electrical-submersible-pump-advanced-artificial.html [5] Crnogorac M., Tanasijević M., Danilović D., Maričić ...
    ... 32:15, 1791-1799, DOI: 10.1080/10916466.2011.565291 [2] Langbauer, C., & Kaserer, G. (2018). Industrial application of a linear drive system in a pump testing facility. 2018 17th International Ural Conference on AC Electric Drives (ACED). doi:10.1109/aced.2018.8341726 [3] Rigzone, How Does Artificial ...
    ... resursi, obrazovanje, primena, razvoj; Abstract: Serbia, as well as almost countries in the region, has a number of problems with the tremor of human capital. This capital, first of all, depends on the level and quality of education, as well as the skills of employees. Entrepreneurship, in order to ...

  • The Potential of Biomarkers to Distinguish Lower and Middle Miocene Lignites from the Coal-Mining District of Lusatia

    I. Kojic, J. Kus, D. Zivotic, K. Stojanovic (2021)
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs 30th International Meeting on Organic Geochemistry ...
    ... are expressed by higher dehydroicetexane content, Paq index, the tetracyclic/tricyclic diterpanes ratio and non-hopanoid triterpenoids content, as well as by lower content of total hopenes (particularly those with double bond at 13(18)-position) and fernenes in the latter one. Mentioned results ...

  • Introduction to special section: Characterization of hydrocarbon and geothermal resource potential and carbon sequestration opportunities of the Pannonian Basin

    Balázs Németh, Gábor Tari, Gábor Bada, Dejan Radivojević, Bruno Tomljenovic, Csaba Krézsek (2018)
    нафтна геологија, геотермална енергија, Панонски басен

  • Synthesis, characterization and photocatalytic examination of Co0.9Ho0.1MoO4 nanopowders

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs The Serbian Society for Ceramic Materials Institute for ...
    ... aqueous solution. A simple and effective . method for controlling: the composition and morphology of Cop.Hoo,, MoOu is presented in this paper, as well as a potentially new approach in the methodology of inorganic synthesis. During photocatalytic · testing nanostructured material CopoHoo,MoOu ...

  • Numerical modelling of the roughly simultaneous emplacement of two distinct ophiolite belts

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2024)

  • Temperature induced evolution of nanostructured Ni0.9Zn0.1O

    Kremenović Aleksandar, Antić Bratislav, Vučinić-Vasić Milica, Colomban Philippe, Jovalekić Čedomir, Bibić Nataša, Kahlenberg Volker, Leoni Matteo (2010)
    The crystal structure and microstructure of as-prepared and annealed Ni0.9Zn0.1O were refined at room temperature in both the Fm (3) over barm and R (3) over barm space groups. It is shown that below the Neel point (458 K), where magnetic ordering triggers the presence of a trigonal strain, the common usage of a higher-symmetry non-admissible space group for crystal structure and microstructure analysis via the Rietveld method may result in both an incorrect structure description and incorrect microstructure ...

  • Seasonal Variations of the Zapadna Morava River Water Quality

    Nebojša Đ. Pantelić, Jana S. Štrbački, Goran Marković, Jelena B. Popović-Đorđević (2021)
    The water samples collected from four localities of the middle course of the Zapadna Morava River during 2020 were analyzed via the selected physicochemical parameters with the aim to estimate the quality of surface water. According to the results of selected physico-chemical parameters (pH, conductivity, dissolved oxygen, chemical oxygen demand, biochemical oxygen demand), analyzed surface water show a good chemical status, while the values of nutrient content (nitrate, nitrite, ammonium ion, total phosphorus) indicated the poor chemical status especially ...
    water quality, dissolved oxygen, ammonium ion, total phosphorus

  • Landscapes and Landforms in the Toplica region (Southern Serbia)

    Aleksandar Valjarević, Natalija Batoćanin, Danica Srećković-Batoćanin, Tin Lukić (2022)
    U radu je prikazano 11 geomorfoloških oblika koji zaslužuju naziv objekata geonasledja. Rad razmatra genezu objekata, neophodnost geokonzervacije, tamo gde još nije pokrenuta, i položaj i distribuciua objekata unutar zona različitog turističkog interesovanja primenom metoda daljinske detekcije, terenskih osmatranja i geografskog informacionog sistema (GIS) .
    Toplica, GIS, analiza, geomorfološki objekat, objekat geonasledja, geneza, erozija