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122 items
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Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal
Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)... Belgrade, Faculty of Chemistry. Polymers 2021, 13, 759 5 of 25 Figure 1. The characteristic weight loss (thermogravimetric analysis, TGA), differential scanning calorimetry (DSC), and derivative weight loss (DTG) curve of lignite (a), HDPE (b), and the lig- nite/HDPE mixture (c). 2.5. Analysis of ...
... 3.1. TGA Analysis Figure 1a shows the TGA curve and derivative weight loss (DTG) curve of pre- extracted lignite. The first peak at 90.8 ◦C corresponds to loss of moisture. Degradation of OM starts at about 300 ◦C and the greatest weight loss is observed in the temperature interval between 400 and 500 ...
... peak, followed by weight loss, starts at about 390 ◦C and ends at about 505 ◦C. The presence of one sharp peak in DTG indicates only one degradation step of HDPE conversion. The temperature corresponding to the maximum release of volatile substances is 483.2 ◦C, while the largest weight loss, 35.28%, c ...Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović. "Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal" in Polymers, MDPI AG (2021). https://doi.org/10.3390/polym13050759
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Keyword Extraction from Parallel Abstracts of Scientific Publications
... as the average weight distributed on the links of a single node and is then used in the procedure of keyword candidate ranking and extraction [8,9]. The node in/outselectivity and generalized in/out- selectivity values are calculated from a directed weighted network as the average weight distributed on ...
... there are variations, the usual way of representing documents as a graph models words as vertices (nodes) and their relations as edges (links). The weight of 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 ...Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić . "Keyword Extraction from Parallel Abstracts of Scientific Publications" in Sematic Keyword-Based Search on Structured Data Sources - Third International KEYSTONE Conference, IKC 2017 Gdańsk, Poland, September 11–12, 2017 Revised Selected Papers and COST Action IC1302 Reports, Springer (2017)
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Integrative GHG Assessment in Oil and Gas Industry
Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...... using the equation [8]: 1 Wt%OC, — 100 mixture — » ;gn,mnenu (Wt%l· ·Wt%c,·) (8) Where: W/t%; - weight percent of component i; W/t%c;i - carbon content of component i on a weight basis. The CO- emission factor can be calculated by using the following, equation [8]: || Eeo, =FC.| _C———— ...
... where: J - any hydrocarbon compound from Equation 6; 12 - molecular wcight of carbon; X - Stoichiometric cocfficient for carbon; Mw - molecular weight of individual compound. t%Cc = -100% () hydrocarbon Use API Compendium recommended No combustion efficiency 98% for production Flare |« ——— ...
... various activitics involved in production and processing. It considers the company's cfforts toward reducing flaring: by employing the gas processing unit to utilize the gas that would otherwise bc flared. Therefore, it provides a comprehensivc representation of thc typical activities and emissions ...Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa. "Integrative GHG Assessment in Oil and Gas Industry" in Energija, ekonomija, ekologija (2023). https://doi.org/10.46793/EEE23-1.51M
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Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach
Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...... al chemistry and design of psychopharmaco- logical drugs led to the development of drug candidates with increased lipophilicity and high molecular weight. It is estimated that 90% of new chemical entities are poorly soluble, which is recognized as a major obstacle in drug development [1]. Because co ...
... Commons _ logical drugs led to the development of drug candidates with increased lipophilicity and Attribution (CC BY) license (https:// high molecular weight. It is estimated that 90% of new chemical entities are poorly soluble, creativecommons.org /licenses/by / which is recognized as a major obstacle in ...
... failures in clinical trials due to insufficient or highly variable drug exposures [4]. By evaluating basic information on molecular structure, molecular weight, as well as results from preformulation studies such as solubility in water and oils, melting tempera- ture, crystallinity, and amorphization ability ...Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić. "Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach" in Pharmaceutics, MDPI, Basel, Switzerland (2021). https://doi.org/10.3390/pharmaceutics13081188
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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
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Some models for determination of parameters of the soil oscillation law during blasting operations
... of 0.15 m, and a cartridge weight of 0.1 kg. An electric capacitor was used for initiation of the explosive. During experimental investigations performed in the Veliki Krivelj Open Pit, the following blasting parameters were specified: ‚ depth of borehole: 0.5 m; ‚ weight of explosive charge per borehole: ...
... properties of the working environment, the following values are obtained: ‚ angle of internal friction: φ = 31˝351 ‚ cohesion: C = 138.33 kPa ‚ volume weight: γ = 26.26 kN/m3 ‚ compressive strength: σp = 80.808 MPa ‚ tensile strength: σz = 7.59 MPa ‚ velocity of longitudinal elastic waves: cp = 6661.00 ...Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić. "Some models for determination of parameters of the soil oscillation law during blasting operations" in Energies, Basel, Switzerland : MDPI (2018). https://doi.org/10.3390/en9080617
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History of meteorite donations to the Collection of Minerals and Rocks of the University of Belgrade, Faculty of Mining and Geology (Serbia)
... It was confirmed that the samples and labels with French handwriting are truly donated by Marquise de Mauroy (Zdravković, 2014). The samples’ weight written on the labels was also very useful. The numbering of the samples and confirmation of the label names were done in 2014, thanks to the ...Alena Zdravković, Maja Milošević, Kristina Šarić, Ivana Jelić, Ana Černok. "History of meteorite donations to the Collection of Minerals and Rocks of the University of Belgrade, Faculty of Mining and Geology (Serbia)" in 9th International Conference Mineralogy and Museums, Sofia, Bulgaria, Earth and Man National Museum and Bulgarian Mineralogical Society (2021)
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Parametri zbijanja komunalnog otpada određeni različitim laboratorijskim metodama
Jovana M Janković Pantić, Dragoslav R Rakić, Irena G Basarić Ikodinović, Tina D Đurić, Snežana Bogdanović (2021)Zbijanje komunalnog otpada predstavlja jednu od osnovnih faza korišćenja komunalne deponije. Zbog toga je kao i kod drugih nasutih građevina, veoma korisno odrediti parametre zbijanja: maksimalnu suvu zapreminsku težinu (dmax) i optimalnu vlažnost (wopt). Dobijeni rezultati mogu da posluže prilikom projektovanja kapaciteta deponije kao i prilikom definisanja obradivosti otpada. U dosadašnjoj praksi najčešći način određivanja parametra zbijanja je standardna metoda (Proktorov opit) koja se koristi u mehanici tla, uz eventualnu redukciju energije zbijanja. Međutim, različiti tretmani komunalnog otpada na ...... operating, е ог ће landfill. Therefore, as with other embankment structures, it is уегу usefull to determine compaction parameters, maximum dry unit weight (ydmax) and optimal moisture content (Wopt). The obtained results can be изед in designing the capacity ог the landfill as well as when defining ...Jovana M Janković Pantić, Dragoslav R Rakić, Irena G Basarić Ikodinović, Tina D Đurić, Snežana Bogdanović . "Parametri zbijanja komunalnog otpada određeni različitim laboratorijskim metodama" in Građevinski kalendar, Savez građevinskih inženjera Srbije (2021)
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Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations
The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija... al. 2008; Ustaszewski et al. 2010). Located to the east (in present-day coordinates) of the Serbo- Macedonian Unit, the Supragetic Unit represents the upper- most nappe of the Dacia Mega-Unit nappe system, predomi- nantly comprised of low-grade greenschist facies metamorphic rocks (Fig. 1b, Kräutner ...
... Cretaceous closure of the Ceahlău–Severin Ocean and Carpathians continental collision, the Supragetic Unit was thrusted over the Getic Unit, forming the largest of the E-vergent Dacia Mega-Unit nappes (e.g., Krstekanić et al. 2017, 2020). The retreat and steepening of the subducting Neotethys oceanic ...
... nian Unit Supragetic nitU Upper Getic sub-unit Ceahlau–Severin nitU Danubian nit/West Balkan U Forebalkan, Kula nitsU Moesian Platform post-Miocene Thrust fault Normal fault Strike-slip fault Tectonic units Magmatics and associated sediments Structures River Lower Getic sub-unit Ophiolitic ...Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković . "Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations" in Geologica Carpathica, Central Library of the Slovak Academy of Sciences (2021). https://doi.org/https://doi.org/10.31577/GeolCarp.72.5.3
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Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils
Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov (2021)MICP process, kinetic study, calcite, vaterite, MALDI-TOF identification, Bacillus licheniformis, Sporosarcina pasteurii... presence in all samples with FTIR analysis. Weight loss dynamics below 400 ◦C vary to a certain extent probably due to a difference in precipitate microstructure (density and particle size), as well as absorbent water. The second part of the DTA diagram shows rapid weight loss above 600 ◦C, followed by a strong ...
... mathematical function whose maximum has been determined by evaluating the scores for all variables, according to Equation (2). Each output variable has its weight (wi) when calculating the function SS: SS = w1 · SR + w2 · pH + w3 · UAG + w4 · UAC + w5 · UBT +w6 · UBC + w7 · UBCA + w8 · MUC + w9 · MEC (2) where: ...
... of 10 ◦C/min. Two stages in the thermal analysis may be noticed, below and above 400 ◦C. Below 400 ◦C three peaks are noticeable followed by a minor weight loss. The first one occurring around 115 ◦C is assigned to evaporation of humidity. The other two peaks around 220 and 290 ◦C probably represent the ...Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov. "Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils" in Microorganisms, MDPI AG (2021). https://doi.org/10.3390/microorganisms9081691
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A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia
When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...... that: d′(Ai) = minV (Si ≥ Sk) (10) for k = 1,2, . . .n; k̸=i. Then the weight vector is given by: W ′(d′(A1), d ′(A2), . . . , d ′(Am)) T (11) where (Ai = 1,2, . . . , n) are n elements. Via normalization, the normalized weight vectors are (Chang, 1996): W (d(A1), d(A2), . . . , d(An)) T (12) 5 ...
... experts’ judgments for the criteria (C1–C4). Using Eqs. (3)–(5), the values of the fuzzy synthetic extent (S) for the analyzed criteria are obtained. Weight vectors (W) of criteria (C1 – C4) are obtained by using Eqs. (6)–(12). Table 8 shows the values of the S and the WC, which represents the priority ...
... alternative (RESs). Table 13 shows the final rank, which is obtained by summing the priority of each alternative previously multiplied by the corresponding weight vectors (WC) of the criteria. According to the multi-criteria assessment, hydropower (A1) has the highest priority (0.3678). With nearly the same ...Boban Pavlović, Dejan Ivezić, Marija Živković. "A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia" in Energy Reports, Elsevier BV (2021). https://doi.org/10.1016/j.egyr.2021.02.072
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Multiple-Criteria Decision-Making in Mine Development Planning
Sanja Bajić (2023)The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.Sanja Bajić. "Multiple-Criteria Decision-Making in Mine Development Planning" in Proceedings of the 5th International Underground Excavations Symposium, 5-6-7 June 2023, Istanbul, Topkapi : Dinç Ofset Mat. Rek. San. ve Tic. Ltd. Şti. (2023)
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Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings
... 38/1 kHz Operator: (Vector max (ch 1-3) 3.50 mm/s at 0.068 s Notes: MM-3 Timescale 0.4 s/div Channel 1 Channel Channel Input Geo Input Input Unit mm/s Unit Unit Trig level 4 Trig level Trig level Pk 1.735 Pk Pk Diff m/s2 0.434 Diff m/s2 Diff m/s2 Integ um 9.57 Integ ym Integ um Frq(zx) Hz 39.5 Frq(zx) ...
... cartridge length 0.15 m, and cartridge weight 0.1 kg. Electric capacitor was used for initiation of the explosive [17]. During experimental investigations performed in Majdanpek open pit, the following blasting parameters were specified: • depth of borehole: 0.5 m, • weight of explosive charge per borehole: ...
... of physical and mechanical properties of the working environment, submitted the following results: • Compressive strength 21.1–93.0 MPa • Volume weight 17.1–26.3 kN/m3 • Density 0.97–0.99 kN/m3 • Porosity 0.0004%–0.026% • Water suction 0.08%–0.23% 4.2.2. Blasting Method Measurements of seismic ...Suzana Lutovac, Branko Gluščević, Rade Tokalić, Jelena Majstorović, Čedomir Beljić. "Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings" in Minerals, Basel : MDPI AG, Basel, Switzerland (2018). https://doi.org/10.3390/min8020070
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Determination of Mechanical Properties of Altered Dacite by Laboratory Methods
This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...... Strength—UCS (σci UCS) The unit weight (determined with paraffin) and the water content of the rock material were determined on samples of dacite and altered dacite. Unit weight tests were performed on 100 samples: 50 samples of dacite and 50 samples of altered dacite. The unit weight values in the altered ...Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović. "Determination of Mechanical Properties of Altered Dacite by Laboratory Methods" in Minerals, MDPI AG (2021). https://doi.org/10.3390/min11080813
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Availability as a dimension of energy security in the Republic of Serbia
Boban Pavlović, Dejan Ivezić (2016)There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...... sum of the elements of the same column: norm 1 , , 1, ,ij n ij i a A i j n a = = = ∑ (19) Next step is to determinate the criteria weight vector, wi, which is built by averaging the entries on each row of the normalised pairwise comparison matrix, Anorm: 1 , , 1,1 , n i ij j ...
... renewables – hydro and biomass. Table 6. Results of individual significance of components Components of availability SOS SS D RES TM Criteria weight, wi 0.0475 0.4552 0.1423 0.2536 0.1195 Individual significance @ 4.7% @ 45% @ 14% @ 25% @ 12% Discussion Based on previously presented results ...
... parameters with parameters of economic and social development of a country). Data for 2014 are used in calculation [11]. 2a TPESTM 0.31 toe/1000 US$ Unit of GDP = = (17) Using same methodology for determination of TM2a, it is formed tab. 4 with values of TM2a for some European countries [11-19]. Table ...Boban Pavlović, Dejan Ivezić. "Availability as a dimension of energy security in the Republic of Serbia" in Thermal Science, National Library of Serbia (2016). https://doi.org/10.2298/TSCI160923303P
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A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)
Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenikaGordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević. "A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)" in Marine and Petroleum Geology, Elsevier BV (2021). https://doi.org/10.1016/j.marpetgeo.2021.105383
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Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia
Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović. "Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia" in CATENA, Elsevier BV (2020). https://doi.org/10.1016/j.catena.2020.104914
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Oдређивање броја камиона за транспорт руде на површинском копу Шупља стијена
Грујичић Стефан (2024)Транспорт на површинским коповима се одвија паралелнпо са осталим процесима екаплоатације. Како не би долазило до непредвиђениих трошкова, потребно је усагласити све системе производње. Димензионисање адекватног транспортног система обезбеђује максималну продуктивност механизације и профитабилну експлоатацију. Чињеница да трошкови транспорта заузимају знатан део укупних трошкова иде у прилог томе да је одређивање потребног броја камиона за превоз откопаног материјала од великог значаја. У овом раду извршен је прорачун броја камиона потребног за транспорт руде од откопних етажа до дробилице на ...... Factor |__1.00 Weight Modification Database Trnuck Payload | 32.05| tonne equiv.to | 11.35|cu.metres Standard Body Capacity of this truck | 24.00| cu metres Empty Trnuck Weight | 27.20|tonne Actual Truck Payload | 32.05| tonne equiv.to | 11.35|cu metres Full Truck Weight | 59.25| tonne |-7]} ...
... Actions and Global Options Database Loading Unit . (Std DB) Loader Class: Shovel (hydraulic) loading Unit Operation Database Bucket Capacity 4.50 Available Bucket Capacity |_ eg {Fil Factor Applied) Actual Bucket Capacity | __ 3.60. Edit Loading Unit Template: KOMATSU PC 800-8RN Operational ...
... yToBapau). Harnej naHeza 3a. yHOC OBHX TIOJ1aTaKa IIpHKa3aH je Ha cJIHIH 4.2. 43 Material x Name {Rud} Production Measurement : \tonne (e)\Weight · ( Bank Volume ( Loose Volume ·( ProductbyWeight Insitu Bank Density 3553| tonne/bom | _3530| | kg/bcm Swell Factors SwellFactor | Loose Density ...Грујичић Стефан. Oдређивање броја камиона за транспорт руде на површинском копу Шупља стијена, 2024
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Advantages and challenges in presenting mathematical content using EDX platform
... tags which annotate the type of content: a question, a response, a possible response and etc. Also there are possibilities for customizing the weight of each problem, number of attempts, feedbacks, randomization of offered answers and time between attempts. A common situation in creating ...Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone. "Advantages and challenges in presenting mathematical content using EDX platform" in The Seventh International Conference on e-Learning (eLearning-2016), Belgrade : Metropolitan University (2016)
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Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit
... — mechanical characteristics of the working environment are: • angle ofinternal friction o = 31935', • cohesion C = 138.33[kN/m{|, • volume weight y = 26.26[kN/ m{l, • compressive strength O, = 80.808{MPa], • tensile strength O = 7.590[MPa], • velocity of ongitudinal elastic waves C, = ...Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac. "Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit" in 9th International Conference Mining and Environmental protection MEP, 24 – 27 May 2023, Sokobanja, Serbia, Belgrade : University of Belgrade-Faculty of mining and geology (2023)