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Упит dcterms_subject_txt:Natural two dimensional materials

743 items

  • Fuzzy optimization in hydrodynamic analysis of groundwater control systems: Case study of the pumping station “Bezdan 1”, Serbia

    Dragoljub Bajić, Dušan Polomčić (2014)
    A groundwater control system was designed to lower the water table and allow the pumping sta-tion “Bezdan 1” to be built. Based on a hydrodynamic analysis that suggested three alternative solutions, mul-ticriteria optimization was applied to select the best alternative. The fuzzy analytic hierarchy process methodwas used, based on triangular fuzzy numbers. An assessment of the various factors that influenced the selec-tion of the best alternative, as well as fuzzy optimization calculations, yielded the “weights” of the alternativesand the ...
    groundwater lowering, groundwater management scenario, fuzzy analytic hierarchy process,expert knowledge, triangular fuzzy numbers, linguistic variables
    ... Analysis The site of the future “Bezdan 1” PS features high groundwater levels, which directly affect the feasibil- ity of construction. Three-dimensional (3D) hydrody- namic modeling, in this case to define a groundwater control system for the “Bezdan 1” PS, is a common approach in modern hydrogeology ...
    ... (GRAHAM 1991; LAI & HWANG 1996). Expert knowledge is used instead of differential equations to describe a system. The know- ledge is conveyed in a natural way, by linguistic vari- ables, such that fuzzy logic is “computing with words” (ZADEH 1965; ZADEH 1975). As indicated above, the basic unit that ...
    ... Djusina 7, 11000 Belgrade, Serbia, e-mail: dupol2@gmail.com DOI: 10.2298/GABP1475103B defined as the variable whose permissible values are words of natural language, and not numbers. Apart from their symbolic linguistic form, linguistic vari- ables also have a quantified analytical form-member- ship function ...

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala
    ... buildings that are potentially suitable for installation of solar panels. For the purpose of representing the topographic surface (three-dimensional terrain) of the urban area of the city of Vranje, a Digital Elevation Model (DEM) is used. The DEM can be represented as a raster. Raster data ...
    ... .pdf) "Available only in Serbian language". Pavlovic, T. Milosavljevic, D., Lambić, M., et al., 2011. "Solar energy in Serbia". Contemporary Materials (Renewable energy sources), Volume II-2, pp. 204 - 209. PBC GIS, 2019. Site Modeling in Context - Obtaining And Transforming Elevation Data, pbc ...
    ... are very useful for the area for which there is no direct measurement data of solar irradiation/insolation (Fu P., Rich P.M., 2000). Basically, two types of analysis can be distinguished within the SAT. The first one involves the analysis of a specific area, named "Area Solar Radiation" (ASR) ...

  • Control of substructure construction of railways in the Republic of Serbia

    Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović (2022)
    Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...
    доњи строј, техничка регулатива, насип, збијеност, контрола
    ... improved layer made of coarse-grained gravel or sandy material and together with the protective layer forms frost protection [3:4-5]. Clay materials and materials that can be compacted and consolidated cannot be installed in the transition layer. The surface of the transition layer meets the conditions: ...
    ... [1:11-11]. 2.2. REGULATIONS FOR MAIN RAILWAYS ("OFFICIAL GAZETTE OF RS", NO. 100/2012) These Regulations define the minimum quality requirements for materials installed in the layers of the substructure. The minimum requirements are prescribed by the values of the degree of compaction Rc*, ie the values ...
    ... values of the deformability modulus Ev2 whose definition is contained in SRPS U.E1.010, ie in DIN 18134. The criteria to be met by the materials installed in the protective and transition layer are given in Table 2, while the criteria for embankments are given in Table 3. Table 2. Minimum value of de ...

  • Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine

    Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina (2015)
    ... Ravilić Marina1 Received: May 29, 2015 Accepted: June 15, 2015 Abstract: During blasting operations, the potential energy of explosive materials is transformed into a mechanical work. That energy, in the vicinity of blasting location, destructs and crushes rock mass, a bit further creates ...
    ... exploitation (Trajković & Lutovac, 2006). Three blasting operations were performed. Balkanit 60/1000 and Videksil 65/2000 are used as explosive materials. The activation of explosives in boreholes was performed using detonating fuse C-12, while initiating of detonating fuse was performed with blasting ...
    ... point m, Q - overall amount of explosive in a mine series kg. 2.2. Models of determination of soil oscillation law parameters There are two parameters K and n in the equation (5) which should be determined for the specific work environment and by particular blasting conditions. With regard ...

  • Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions

    Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)
    A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...
    Ceria, Yttrium, Solid solution, Mechanosynthesis, Oxygen vacancy, Nanocrystalline material

  • 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
    ... applications, geotechnical and ecological engineering, bio-based solution for soil, sand, cement-based matrix, etc. Supplementary Materials: The supplementary materials are available online at https://www.mdpi. com/article/10.3390/microorganisms9081691/s1. Table S1: Standard Score Analyses Database ...
    ... 1000 ◦C, at a rate 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 ...
    ... on from the action of wind and water erosion [3], removing heavy metals from wastewaters [4], or promoting the self-healing effect of calcareous materials [5]. The water absorption of the monumental limestone was reduced by 60% after the MICP treatment by Micrococcus sp. isolated from Microorganisms ...

  • 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 ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... protection. Many studies developed multi-dimensional approach for conceptualizing energy se- curity and determination of energy indicators [1-6]. Selection of data used for indicators deter- mination primarily depends on the vision of a multi-dimensional concept of energy security, and from the ...
    ... imported oil and natural gas, this indicator is very important because it shows the ability of the country to maintain strategic stocks of critical fuels – oil [12] and natural gas [13]. 2 Oil stockSOS (Oil) 0.086 (8,6%) Oil consumption = = (2) 2 Natural gas stockSOS (Natural gas) 0.2227 (22 ...
    ... ticeable in imports of oil and natural gas, especially if currently estimated remaining reserves (8.3 years for oil, 7 years for natural gas) and resources (29.6 years for oil and natural gas combined) are taken into consideration. The SOS is especially affected in the natural gas sector because of import ...

  • Improving efficiency of thermal power plants through mine coal quality planning and control

    Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja (2018)
    Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...
    mine planning, variability of coal quality, simulation, coal blending

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... Non-renewable natural resources shall be used under the conditions which ensure their long-term, economical and reasonable utilization, including limited utilization of strategic or rare natural resources and substitution by other available resources, composite or artificial materials. Principle ...
    ... concentration of natural radionuclides varies depending on various factors such as relief, soil type, climatic conditions and agricultural practice (Bossew and Kirchner, 2004). Natural radionuclides of uranium and thorium are widespread in the Earth's crust (Khan, 2007). MATERIALS AND METHODS ...
    ... and promote natural resources, and according to the management plan, to implement active protection measures in order to preserve natural values of the area. The protected area of category 1 is internationally, nationally and generally important, and is situated in the territory of two Or more units ...

  • Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... These values range from 6 to 7.5 ◦C/100 m. Geothermal basement reservoir discharge is carried out in two ways: predominantly via deep geothermal wells or in a natural way over the springs. The natural discharge is connected only to the terrain of Fruska Gora, where it takes place along fault-line structures ...
    ... from facilities placed within urban or rural settlements to sometimes rather remote places with poor or no infrastructure. 2. Materials and Methods This paper shows two sites where geothermal resources were formed within different types of reservoirs, as well as with different temperatures and diverse ...
    ... geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come from different types of reservoirs having different ...

  • Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    To strengthen the security of supply of the Serbian gas sector, it is necessary to analyze the impact of planned strategic measures. The analysis involves the identification of the most influential threats to the security of natural gas supply and prioritization of the strategic measures for overcoming the consequences of threats. The proposed methodology is based on Fuzzy Analytic Hierarchy Process. The obtained weights for the identified threats and strategic measures are formed according to experts' judgments. The results ...
    Sigurnost snabdevanja, Donošenje odluka, Snabdevanje prirodnim gasom, Fazi AHP, Energetski indikatori

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... deformation modulus, and dynamic deformation modulus values obtained by field tests. Introduction The compaction and bearing capacity of natural materials are the most important indicators that must be satisfied during the construction of the foundation layers of pavements. Control procedures are ...
    ... correlations with the parameters obtained by standard procedures were observed and can be used to solve practical tasks. Materials and Methods All tests were performed on natural gravel material sampled at a temporary landfill at 'Batajnica Inter- modal Terminal in Belgrade. The same material was ...
    ... . The identification-classification analysis of the natural material samples in accordance with SRPS EN ISO 14688-2:2018 did not indicate significant differences in the grain size distribution, and it was determined that the material is natural mineral soil, sandy gravel (Sa-Gr), and non-plastic ...

  • Extreme Rainfall Event and Its Aftermath Analysis—IPL 210 Project Progress Report

    Biljana Abolmasov, Mileva Samardžić Petrović, Ranka Stanković, Miloš Marjanović, Jelka Krušić, Uroš Đurić (2021)
    Landslides, Extreme precipitation, Data analysis, IPL project report

  • Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)

    Saša Ivanišević, Dejan Radivojević (2018)
    Exploration for oil and gas in mature areas, such as the Pannonian Basin, can benefit from reexamination of old data using more advanced modern workflows that focus on the temporal and spatial aspects of sediment deposition. Specifically, we apply a new environment of deposition model that interprets the Upper Miocene- Pliocene sediments as being deposited in a rapidly filling basin characterized by quick shelf edge progradation from the northwest toward the southeast. Reconstruction of this shelf edge trajectory reveals ...
    naftna geologija, depozicione sredine, formacije, Panonski basen

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • An Approach to Management Decision Support: The Coal Mine Pljevlja Management Information System

    Božo Kolonja, Ranka Stanković, Filip Vuković, Ivan Obradović (2006)
    In this paper we describe the approach that has been used in the development of the Management Information System (MIS) in the Coal Mine Pljevlja in Montenegro. The methodology of this approach was based on new information technologies and management techniques which have already been successfully applied in other related fields. Its main goal was to introduce modern management techniques to mining, adapted to specific features of the mining industry, its operations and environment, thus enabling the tactical management ...
    ... orders, which includes technical elaboration of: equipment maintenance operations, troubleshooting, required workforce per norm, all spare parts, materials and drawings necessary to carry out the works, as shown in Figure 4. Figure 3. Recording of production data This program system is used for ...
    ... for issuing and monitoring of realization of internal orders for procurement of necessary equipment or spare parts, requisitions of materials and spare parts from the warehouse, orders to the Commercial Department concerning services of third parties, orders for obtaining drawings of technical ...
    ... strategy for information technology and human resource development to address all of the issues that will improve its sustainability over the next two decades. 2 THE TECHNOLOGICAL INFORMATION SYSTEM The Technological Information System (TIS) encompasses the most important segments of mine business ...

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

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

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Uroš Pantelić (2015)
    ... “slicing and dicing” (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 ...
    ... codified and stored knowledge is used within the organization in knowledge application. Business intelligence (BI) is closely related to KM and the two of them are often confused within the entrepreneurial community. However, BI is more focused on decision making using data warehousing and online ...
    ... nal structure of mine, shifts and working day in which the violation occurred, the source and cause of the injuries, etc. Figure 1 depicts two OLAP cubes. Each cell of the cubes holds a number of injuries. In the first cube injuries are categorized according to the type of injury and the quarter ...

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Ionothermal synthesis and crystal structure of a new organic–inorganic hybrid compound:catena-poly[bis(1-ethyl-3-methylimidazolium) [hepta-μ-bromido-pentacuprate(I)]]

    Ljiljana Karanović, Dejan Poleti, Tamara Đorđević (2014)
    A new organic-inorganic hybrid compound, catena-poly[bis(1-ethyl-3-methylimidazolium) [μ5-bromido-tri-μ3-bromido-tri-μ2-bromido-pentacuprate(I)]], {(C6H11N2)2[Cu5Br7]}n, has been obtained under ionothermal conditions from a reaction mixture containing Ba(OH)2•8H O, Cu(OH)2•2H2O, As2O5 , 1-ethyl-3-methylimidazolium bromide and distilled water. The crystal structure consists of complex [Cu5Br7]2- anions arranged in sinusoidal {[Cu5Br7]2-}n chains running along the a axis, which are surrounded by 1-ethyl-3-methylimidazolium cations. Three of the five unique Br atoms and one of the three Cu(I) atoms occupy special positions with half-occupancy (a mirror plane perpendicular to the b ...
    кристална структура, органско-неорганско хибридно једињење, бакар(I) бромид, јонотермна синтеза, 1-етил-3-метилимидазолијум бромид, Cu•••Cu интеракције