Претрага
671 items
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Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material
Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, PyrophylliteBorislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić. "Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material" in Applied Surface Science, Elsevier BV (2022). https://doi.org/10.1016/j.apsusc.2022.155114
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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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A tool for identifying the criticality in the disordered systems with metastable dynamics
Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević. "A tool for identifying the criticality in the disordered systems with metastable dynamics" in Physica A: Statistical Mechanics and its Applications, Elsevier BV (2021). https://doi.org/10.1016/j.physa.2021.125883
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Threshold-induced correlations in the Random Field Ising Model
... Analysis of spanning avalanches in the two-dimensional nonequilibrium zero- temperature random-�eld Ising model. Phys. Rev. E 89, 012118 (2014). 34. Spasojević, D., Mijatović, S., Navas-Portella, V. & Vives, E. Crossover from three-dimensional to two-dimensional systems in the nonequilibrium zero- ...
... Analysis of spanning avalanches in the two-dimensional nonequilibrium zero- temperature random-field Ising model. Phys. Rev. E 89, 012118 (2014). 34. Spasojevi¢, D., Mijatovic, S., Navas-Portella, V. & Vives, E. Crossover from three-dimensional to two-dimensional systems in the nonequilibrium zero-temperature ...
... Numerical Evidence for Critical Behavior of the Two-Dimensional Nonequilibrium Zero-Temperature Random Field Ising Model. Phys. Rev. Lett. 106, 175701 (2011). 10. Spasojević, D., Janićević, S. & Knežević, M. Avalanche Distributions in the Two-Dimensional Nonequilibrium Zero-Temperature Random Field ...Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević. "Threshold-induced correlations in the Random Field Ising Model" in Scientific Reports, Springer Science and Business Media LLC (2018). https://doi.org/10.1038/s41598-018-20759-6
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Kristalne strukture Cs2HoSi4O10F i Cs2TmSi4O10F
... [1] and Cs2ErSi4O10F [2]. The crystal structure of these compounds consists of multiple chains of SiO4-tetrahedra connected by infinite one-dimensional chains of REEO4F2-octahedra. Cesium cations are located in tunnels formed by condensation of the tetrahedral network and octahedral chains. SiO4- ...
... synthesized by the method of crystal growth from a high-temperature solution (Tmax = 1373 K) using REE2O3 (REE = Ho, Tm), SiO2 and CsF as starting materials. The crystal structures of both compounds were determined by single-crystal X-ray diffraction analysis. They represent mutually isostructural compounds ...
... Kr a a bia e-mail: predrag.dabic@rgf.bg.ac.rs During investigation focused on the synthesis of new potassium rare-earth elements silicates two compounds with a previously unknown chemical composition - Cs2HoSi4O10F and Cs2TmSi4O10F were obtained in form of single crystals. The compounds were ...Predrag Dabić, Sabina Kovač, Aleksandar Kremenović. "Kristalne strukture Cs2HoSi4O10F i Cs2TmSi4O10F" in XXVII konferencija Srpskog kristalografskog društva, Kragujevac, 16-17. septembar 2021., Beograd : Srpsko kristalografsko društvo (2021)
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Nonequilibrium athermal random-field Ising model on hexagonal lattices
Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević. "Nonequilibrium athermal random-field Ising model on hexagonal lattices" in Physical Review E, American Physical Society (APS) (2021). https://doi.org/10.1103/PhysRevE.103.032147
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Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study
Debris flows induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy to obtain pre event and post event high-resolution data in the rural or mountainous area. Thus, the topology of terrain is the most important input parameter for the every real case ...... flows. Natural Hazards 19: 47-77. Savage SB, Hutter K (1989) The motion of a finite mass of granular material down a rough incline. Journal of Fluid Mechanics 199 (1): 177-215. Schraml K, Thomschitz B, Mcardell BW, Graf C, Kaitna R (2015) Modeling debris-flow runout patterns on two alpine fans ...
... dense snow avalanches in three-dimensional terrain with the numerical simulation program RAMMS. Differential Equations.vol. Proceeding, pp. 709-716. Christen M, Kowalski J, Bartelt P (2010a) RAMMS: Numerical simulation of dense snow avalanches in three-dimensional terrain. Cold Regions Science ...
... deposition height. The best fitted parameters that were chosen are μ=0.11 and ξ=500 m/s2 (Fig 6). In both cases, there are a lot of outflow materials, since material was transported further throw valley of Selanacka river. This is something that would be interesting to include in future in modelling ...Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović. "Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study" in 4th Regional Symposium on Landslides in the Adriatic Balkan Region, 23-25 October 2019, Sarajevo, Bosnia and Herzegovina, Geotechnical Society of Bosnia and Herzegovina (2019). https://doi.org/ 10.35123/ReSyLAB_2019
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Synthesis, magnetic, thermal and structural properties of Co(II), Ni(II) and Cu(II) complexes containing isophthalato ligands
A series of novel ternary Co(II), Ni(II) and Cu(II) complexes containing 2,20-dipyridylamine (dipya), 2,20-bipyridine (bipy), and 1,10-phenanthroline (phen), as aromatic diamine ligands, and dianion of isophthalic acid (ipht) have been prepared by ligand exchange reactions from diluted H2O/EtOH solutions. The complexes were characterized by elemental analysis, IR spectroscopy, magnetic susceptibility measurements and TG and DSC analysis. Three complexes, Cu(dipya)(ipht)H2O (1), Co(dipya)(ipht)2H2O (2) and Cu(ipht)(phen)2H2O (5) are polymeric with bis-monodentate ipht, while the other two complexes M(bipy)(ipht)4H2O, M@Co(II) (3) and ...комплекси прелазних метала, карбоксилатни лиганди, N-лиганди, кристална структура, магнетна својстваJelena Rogan, Dejan Poleti, Ljiljana Karanović, Zvonko Jagličić. "Synthesis, magnetic, thermal and structural properties of Co(II), Ni(II) and Cu(II) complexes containing isophthalato ligands" in Journal of Molecular Structure, Elsevier BV (2011). https://doi.org/10.1016/j.molstruc.2010.11.024
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2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem
... n of geophysical (geoelectrical) methods is based on the number of dimensions shown, thus, we have one-dimensional, two-dimensional and three- dimensional geophysical methods. One-dimensional methods (1D) are used only when we want to get the information of the thickness and depth of layers, without ...
... lateral changes are present. This kind of survey method requires the least amount of data that has to be acquired and therefore is the cheapest. Two-dimensional (2D) geoelectrical surveys are giving us the information about the lateral changes of resistivity, because of that they demand more acquired ...
... data and gained information of the subsurface. That is why they are a favorable option of geoelectrical surveying methods (Dahlin, 1996). Three-dimensional (3D) surveys provide information about the whole geometry of the surveyed half-space. For this kind of study, the largest amount of acquired ...Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov. "2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem" in Podzemni radovi, Centre for Evaluation in Education and Science (CEON/CEES) (2019). https://doi.org/10.5937/PodRad1934059S
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Gate Road Support Deformation Forecasting Based on Multivariate Singular Spectrum Analysis and Fuzzy Time Series
Luka Crnogorac, Rade Tokalić, Zoran Gligorić, Aleksandar Milutinović, Suzana Lutovac, Aleksandar Ganić (2021)Underground mining engineers and planners in our country are faced with extremely difficult working conditions and a continuous shortage of money. Production disruptions are frequent and can sometimes last more than a week. During this time, gate road support is additionally exposed to rock stress and the result is its progressive deformation and the loss of functionality of gate roads. In such an environment, it is necessary to develop a low-cost methodology to maintain a gate road support system. ...deformacije podgrade, lasersko skeniranje, višekanalna singularna spektralna analiza, prognoza, klasterisanje fuzzy vremenskih serija... generality, we equal the upper edge with the lower and transform the surface of the support into one line, i.e., we reduce a real two-dimensional support to an artificial one-dimensional support; S(t = 0) ∈ R2 → Bl(t = 0) ∈ R , (Figure 1). The initial configuration of Bl(t), t = 0 is undeformed and known (recorded ...
... to use the same coordinate system to describe deformations over the time of monitoring. Figure 1. Transformation of real two-dimensional support to an artificial one-dimensional support. The position of the marker m ( → v , t ) , induced by rock stress, changes according to the following vector equation ...
... the same. At the first stage of the algorithm, the decomposition, includes the following two steps: embedding and singular value decomposition (SVD) [14,16]. Embedding is a mapping that transfers a one dimensional time series of coordinates X(i) Ni = ( x(i)1 , . . . , x(i)Ni ) into a multidimensional ...Luka Crnogorac, Rade Tokalić, Zoran Gligorić, Aleksandar Milutinović, Suzana Lutovac, Aleksandar Ganić. "Gate Road Support Deformation Forecasting Based on Multivariate Singular Spectrum Analysis and Fuzzy Time Series" in Energies, MDPI (2021). https://doi.org/https://doi.org/10.3390/en14123710
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Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)
A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...... concept of the hydrodynamic model of the groundwater sources that provide water supply to Kikinda is based on the simulation of three-dimensional groundwater flow. Natural factors, such as the type and characteristics of the represented geological units, the distribution of water-bearing and impermeable ...
... transformed into the coordinate system of the model based on voluminous borehole data collected in the extended area. Figure 4 shows the three-dimensional hydrogeological model of the sectional view of Šumice. The tapped water-bearing horizon is shown in blue, with production well screens shown ...
... factories: MSK (producer of methanol and acetic acid), TM (tile producer), and LŽT - Kikinda (manufacturer of industrial machinery). The tree-dimensional (3D) finite-difference numerical model for the present study was developed using Modflow [20] with Groundwater Vistas as the graphical user interface ...Dušan Polomčić, Dragoljub Bajić, Jelena Zarić. "Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)" in Journal of Sustainable Development of Energy, Water and Environment Systems (2015). https://doi.org/10.13044/j.sdewes.2015.03.0017
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Terminological and lexical resources used to provide open multilingual educational resources
Open educational resources (OER) within BAEKTEL (Blending Academic and Entrepreneurial Knowledge in Technology enhanced learning) network will be available in different languages, mostly in the languages of Western Balkans, Russian and English. University of Belgrade (UB) hosts a central repository based on: BAEKTEL Metadata Portal (BMP), terminological web application for management, browse and search of terminological resources, web services for linguistic support (query expansion, information retrieval, OER indexing, etc.), annotation of selected resources and OER repository on local edX ...... application for terminology management. Keywords: Open Educational Resources, Lexical resources, Natural Language Processing, Terminology 1. INTRODUCTION Natural Language Processing (NLP) has a two-faceted approach to education where one involves e-learning and computer-assisted learning and i ...
... Forthcoming, C. Greenhow, J. Sonnevend and C. Agur, Ed. Cambridge, MA: MIT Press, 2016, pp. 22. [3] D. Litman, “Natural language processing for enhancing teaching and learning,” in Proc. Natural language processing for enhancing teaching and learning, 2016, pp. 4170–4176. [4] T. M. Cabré Castellví, ...
... dictionaries are found in LADL (Laboratoire d'Automatique Documentaire et Linguistique) format. There are two types of dictionaries: dictionary of simple words and dictionary of compounds. Two main components of dictionary of simple words are DELAS and DELAF. Here we have an entry found in Serbian ...Biljana Lazić, Danica Seničić, Aleksandra Tomašević, Bojan Zlatić. "Terminological and lexical resources used to provide open multilingual educational resources" in The Seventh International Conference on eLearning (eLearning-2016), 29-30 September 2016, Belgrade, Serbia, Belgrade : Belgrade Metropolitan University (2016)
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Optimisation of underground mine decline development system using genetic algorithm
... U f x g x i r h x j m x x x (1) In this formulation x is the n-dimensional vector of SBP and UMCP coordinates, while xL and xU are the n-dimensional vectors representing the lower and upper bounds of the coordinates, i.e. the design space. The optimisation ...
... n goal is to minimize the objective function f(x) subject to a given number of constraints: gi(x) is the r-dimensional vector of inequality constraints, while hj(x) is the m-dimensional vector of equality constraints. The objective function represents the total costs needed to develop surface ...
... DOT1 are replaced in the new version of the software tool, DOT2, by a method based on an understanding of exact solutions to a constrained 3-dimensional path problem. Their approach is based on the minimization of the cost of the decline, where the cost is a combination of both development and haulage ...Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović. "Optimisation of underground mine decline development system using genetic algorithm" in Underground mining engineering, Beograd : Univerzitet u Beogradu – Rudarsko–geološki fakultet (2014)
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Water in the Alluaudite Type-Compounds: Synthesis, Crystal Structure and Magnetic Properties of Co3(AsO4)0.5+x(HAsO4)2−x(H2AsO4)0.5+x[(H,□)0.5(H2O,H3O)0.5]2x+
In this study, a new cobalt arsenate belonging to the alluaudite supergroup compounds with the general formula of Co3(AsO4)0.5+x(HAsO4)2−x(H2AsO4)0.5+x[(H, )0.5(H2O,H3O)0.5]2x+ (denoted as CoAsAllu) was synthesized under hydrothermal conditions. Its crystal structure was determined by a room-temperature single-crystal X-ray diffraction analysis: space group C2/c, a = 11.6978(8), b = 12.5713(7), c = 6.7705(5) Å, b = 113.255(5)◦, V = 914.76(11) Å3, Z = 2 for As6H8Co6O25. It represents a new member of alluaudite-like protonated arsenates and the first alluaudite-like phase ...супергрупа алуаудита, арсенати прелазних метала, хидротермална синтеза, кристална структура, хидратисани хидрокси-арсенати, стехиометрија, магнетна својстваTamara Đorđević, Ljiljana Karanović, Marko Jagodič, Zvonko Jagličić. "Water in the Alluaudite Type-Compounds: Synthesis, Crystal Structure and Magnetic Properties of Co3(AsO4)0.5+x(HAsO4)2−x(H2AsO4)0.5+x[(H,□)0.5(H2O,H3O)0.5]2x+" in Minerals, MDPI AG (2021). https://doi.org/10.3390/min11121372
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GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities
Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević . "GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities" in Contributions to International Conferences on Engineering Surveying. Springer Proceedings in Earth and Environmental Sciences, Dubrovnik, Croatia, October 22-23, 2020, Springer, Cham (2021). https://doi.org/10.1007/978-3-030-51953-7_21
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Shear strength of municipal waste materials from two landfills in Serbia
Rakić Dragoslav, Čaki Laslo, Ćorić Slobodan. "Shear strength of municipal waste materials from two landfills in Serbia" in Coupled Phenomena in Environmental Geotechnics (CPEG) – from theoretical and experimental research to practical applications, Torino, Italy:CRC Press, Taylor & Francis Group (2013): 347-354
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Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer
Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)... legislation in the two countries required); ' introduce river bank filtration along major rivers such as the Danube and the Tisa; . initiate a suruey for artificial recharge, where natural conditions would be assumed to be promising for such inter-ventions. In line with last two proposals the alternative ...
... *roPooo .l $n) 640000 I czoooo r000 0 *1000 *2000 r c -3000 o 9 -+ooo !) E -5000 -6000 -7000 -8000 *"l,o,Tio 75oooo Figure 4.9.2 Three-dimensional model and general cross section through the study area between Danube (Duna, in ihe west) and Tisa River (Tisza in the east). Note: 'Pannonian'layers ...
... 250m or even more (600m in Szeged). The well capacity ranges from 5 to 251s i, depending on geology, applied drilling techniclues, construction materials, well development and other factors 17]. In the past, many wel1s were over-pumped and forced beyond their optimal capacities, which caused them ...Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić. "Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer" in Transboundary Water Resources Management - A Multidisciplinary Approach, Weinheim, Germany : Wiley-VCH (2011): 143-149
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Insights into dike nucleation and eruption dynamics from high-resolution seismic imaging of magmatic system at the East Pacific Rise
Milena Marjanović, Suzanne M. Carbotte, Alexandre Stopin, Satish C. Singh, René-Édouard Plessix, Miloš Marjanović, Mladen R. Nedimović, Juan Pablo Canales, Hélène D. Carton, John C. Mutter, Javier Escartín (2023)Milena Marjanović, Suzanne M. Carbotte, Alexandre Stopin, Satish C. Singh, René-Édouard Plessix, Miloš Marjanović, Mladen R. Nedimović, Juan Pablo Canales, Hélène D. Carton, John C. Mutter, Javier Escartín. "Insights into dike nucleation and eruption dynamics from high-resolution seismic imaging of magmatic system at the East Pacific Rise" in Science Advances, American Association for the Advancement of Science (AAAS) (2023). https://doi.org/10.1126/sciadv.adi2698
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Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases
The infuences of the application of mono- and two-component organic modifers on lipophilicity determination of 12 tetradentate Schif bases by reversed-phase thin layer chromatography were investigated. The main goal is to estimate types of interaction between observed compounds and components of the applied chromatographic systems and establish some behaviour pattern in order to easier choose a combination of organic modifers which will simulate interaction in biological systems based on the facts that the same basic intermolecular interactions are responsible ...Materials Chemistry, Industrial and Manufacturing Engineering, General Chemical Engineering, Biochemistry,General ChemistryNikola Stevanović, Aleksandar Mijatović, Aleksandar Lolić, Mario Zlatović, Rada Baošić. "Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases" in Chemical Papers, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s11696-021-01884-5
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Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases
The infuences of the application of mono- and two-component organic modifers on lipophilicity determination of 12 tet radentate Schif bases by reversed-phase thin layer chromatography were investigated. The main goal is to estimate types of interaction between observed compounds and components of the applied chromatographic systems and establish some behaviour pattern in order to easier choose a combination of organic modifers which will simulate interaction in biological systems based on the facts that the same basic intermolecular interactions are ...Materials Chemistry, Industrial and Manufacturing Engineering, General Chemical Engineering, Biochemistry, General ChemistryNikola Stevanović, Aleksandar Mijatović, Aleksandar Lolić, Mario Zlatović, Rada Baošić. "Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases" in Chemical Papers, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s11696-021-01884-5