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Упит dcterms_subject_txt:top-down method

508 items

  • Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković (2021)
    The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...
    In Pit Crushing and Conveying, IPCC, open pit mining, haulage, optimization, costs saving

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    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 ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... kWh/m2/per year (RS2, 2016). 3. Materials and methods 3.1. Fuzzy AHP method As the method of the MCDA, FAHP systematically solves the problem using the concepts of fuzzy set theory and hierarchical structure analysis, typical for the AHP method. The model for prioritizing RESs for energy generation first divides ...
    ... and for dealing with uncertainty in a decision-making process, FAHP appeared to be a useful tool. FAHP combines the fuzzy theory and the AHP method. The AHP method structures a problem hierarchically, descending from an objective to criteria, sub-criteria, and alternatives in successive levels (Saaty, ...
    ... divides the objective of the research into a hierarchy. The top-level in the hierarchy is the objective of the research which is ‘‘Identification of renewable energy sources with the most potential for electricity generation’’. The second level represents criteria (C1 - C4). The RESs (alterna- tives ...

  • Effect of natural gas composition on methane number: A case of gas reservoirs in Serbia

    Marija Živković, Milica Ivić, Dejan Ivezić, Aleksandar Madžarević (2017)
    Natural gas is considered as the most environmentally acceptable fossil fuel, thus it is an alternative to petroleum derivate, dominantly used in internal combustion engines. Physical properties of a fuel as well as behavior during combustion process are affected by its composition. This article presents analysis of effect of natural gas composition on methane number (MN), conducted for natural gas deposits in Serbia. For empirically determination of MN: California air resources board (CARB) method and Linear and Anstalt für ...
    Састав, метански број, природни гас

  • Examination and characterization of nanostructured Co0.9Ho0.1MoO4

    Милена Росић, Маја Милошевић, Мариа Чебела, Владимир Додевски, Весна Лојпур, Марија Васић, Александра Зарубица (2023)
    ... promising method that achieves control of stoichiometry, homogeneity, and purity. The synthesized samples were examined by DTA, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, Spectroscopy, Field emission scanning electron microscopy (FESEM), and nitrogen adsorption method. The ...
    ... Serbia The nanostructured powderwas synthesized by the glycine nitrate procedure (GNP) because it proved to be the most effective and simplest method suitable for controlling the composition and morphology of CoooHooiMoOua. To prepare nanostructured CoooHoo,MoOua, metal nitrates, and glycine ...

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

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja
    ... value zone (1.2 Ωm). Comparing it to the geotechnical profile the waste is laying on top of the marl basis which starts to be detected at the depth of around 8-8.5 m. Using the 2D geoelectrical scanning method, that zone was not detected even though marl has an order of magnitude higher resistivity ...
    ... former communal waste dump “Ada Huja” (Figure 1). This type of method was used given that immense lateral resistivity changes were expected in the hoarded material and accounting for the time and funding aspect, this kind of method was a logical choice. 2D geoelectrical resistivity tomography ...
    ... the half- space also have a low resistivity value, but one order of magnitude greater that the deposited waste. Figure 4 Sections of apparent (top) and true (bottom) resistivity values of profile line I, part 3 (modified after Sretenović, 1998) Information acquired from the fourth part of ...

  • Compaction of Municipal Solid Waste

    Jovana Janković Pantic, Dragoslav Rakić, Tina Đurić, Irena Basarić Ikodinović, Snežana Bogdanović (2022)
    Regardless of the numerous activities undertaken to reduce municipal solid waste, its annual volumes continue to grow. In Serbia, the most common and the only one form of waste disposal is at municipal landfills with daily compaction and soil covering. Municipal waste compacting is one of the basic components of the disposal process. Well compacted waste takes up less volume and allows much safer storage. In order to better predict the behavior of municipal waste at landfills, it is ...
    compaction, hammer with spikes, landfill, municipal solid waste, proctor compaction test

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... sample composition was determined by X-ray diffraction method (Rigaku SmartLab, X-ray diffractometer) under the conditions provided in Table I. The humus content has been determined by volumetric method15 and the clay content by hydrometric method.16 Sorption capacity for all three soil types has been ...
    ... Imaging of the calibration solutions, extraction solutions and results processing was done as per the created “Rare Earths” method. The limit of detection (LOD) for this method for La amounts to 0.23 μg g-1, and the limit of quantification (LOQ) 0.77 μg g-1, whereas LOD for Nd amounts to 0.52 μg g-1 ...
    ... The method of sequential extraction based on the results presented is suitable for extraction of rare earth elements from sand and clay type of soils. Humus soil has demonstrated more intensive sorption properties, therefore these types of extractions are limited on it, namely this method is not ...

  • Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery

    Maja Milošević, Biljana Đorđević, Mihovil Logar (2020)
    калцит, сирова глина, традиционална керамика, Злакуса
    ... grain-size distribution was determined using the pipette method according to the DIN ISO 11277 (2002). The Atterberg limits (plasticity index (PI), plastic limit (PL) and liquid limit (LL)) were determined according to the Casagrande method (LCPC, 1987) and calculated according to Atterberg (1911) ...
    ... Applied Clay Science, 162, 146–154. De Oliveira Modesto C. & Bernardin A.M. (2008) Determination of clay plas- ticity: indentation method versus Pfefferkorn method. Applied Clay Science, 40, 15–19. DIN ISO 11277 (2002) Bodenbeschaffenheit - Bestimmung der Partikelgr Jlenverteilung in Mineralb ...
    ... Fenili E.P., Biz E, Boa Hora P.R.M., Madeira R., Modesto C.O. & Bernardin A.M. (2004) Determination of clay plasticity: indentation method vs. Pfefferkorn method. Pp. 47-53 in: VIII World Congress on Ceramic Tile Quality. Castellon, Spain, Official Chamber of Commerce, Industry and Navigation. ...

  • Određivanje sadržaja kiselih funkcionalnih grupa na površini biougljeva primenom Boehm-ovih titracija

    Aleksandar D. Krstić, Aleksandar Đ. Lolić, Marija A. Ilić, Aleksandar M. Mijatović, Snežana J. Zlatanović, Zoran P. Nedić, Vesna M. Pavelkić (2015)
    Biougalj se dobija pirolizom iz organskog otpada. Smatra se ,,modifikatorom'' zemljišta i koristi se kao đubrivo i kao rezervoar za skladištenje ugljenika. Kvantifikacija funkcionalih grupa je važna zbog hemijske reaktivnosti biougljeva koji imaju uticaj na svojstva zemljišta. U istraživanju su korišćena 3 uzorka biouglja različitog porekla i jedan referentni, aktivni ugalj. Sadržaj kiselih funkcionalnih grupa je određivan titracijom po Boehm-u na dva načina: uvođenje N2 tokom titracije i tretman sa BaCl2. Optimizovan je način pripreme tri Boehm ova rastvora ...
    ... ekstrakti su snimani spektrofotometrijski na talasnoj duzini 250 nm. Determination of oxygen surface groups on biochars using Boehm-titration method Aleksandar D. Krstié, Aleksandar D. Lolié, Marija A. Ii, Aleksandar M, Mijatovic’, ‘SneZana J. Zlatanovi¢, Zoran P. Nedié™, Vesna M. Pavelki¢™” ...
    ... solutions was optimized (NaOH, Na:COs, NaHCOs, conc. 0,05 mol/dm*). The preparation of the NaOH standard solution was investigated as well as the method of removing CO: before or during titration which is sensitive in the presence of CO; and dissolved organic compounds and the time of sparging by ...

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... of its extremely heterogeneous composition, consistency, biodegradability etc. In addition, physical properties of waste change over time, so the method of taking and selection of representative samples is problematic and has not yet been standardized. In this paper, the most common determination ...
    ... 1 INTRODUCTION of material for specific groups that are published by different authors, EU member countries have developed and proposed formal method for the waste composition definition called „S.W.A. - Tool'* (European Commission - EC, 2004). Unlike soil, determination of physical parameters ...
    ... addition, physical properties of •n žž% M:s| ; H n pj ii r waste change over time, both in depth and from · · O waste- location to location, so the method of taking and O selection of representative samples is problematic and y &@F"c'“f'“ a has not yet been standardized (Rakić et al., 2011). The ” Šoil

  • Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif

    Ljiljana Vasić, Laszlo Palcsu, Huang Fen (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry

  • Preliminary regional landslide susceptibility assessment using limited data

    Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)
    In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...
    klizišta, podložnost
    ... data is presented. It is called arbitrary polynomial method and takes in- to account 5 landslide conditioning parameters: lithology, slope inclination, average annual rain- fall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for ...
    ... Keywords: regional landslide susceptibility, arbitrary-polynomial method, conditioning parameters, sensitivity, Polog region G eo lo g ia C ro a ti ca Geologia Croatica 72/182 have proven to be a reliable and cost-effective method that allows detailed and comparable assessments of landslide ...
    ... feasible and is a practical tool in landslide susceptibility zonation practice. 2. THE ARBITRARY – POLYNOMIAL METHOD The approach used in this paper is named the arbitrary polyno- mial method, and engages five landslide conditioning parameters: lithology, slope inclination, average annual rainfall, ...

  • Digital Library From A Domain Of Criminalistics As A Foundation For A Forensic Text Analysis

    Dalibor Vorkapić, Aleksandra Tomašević, Miljana Mladenović, Ranka Stanković, Nikola Vulović (2017)
    U ovom radu predstavljen je model koji omogućava prikupljanje, pripremu, opis metapodataka, upravljanje i eksploataciju, uključujući pretragu punog teksta dokumenata iz domena kriminalistike napisanih na srpskom jeziku. Predloženi pristup primenjuje se na veb portalu koji sakuplja različite tekstove nastale iz časopisa Akademije za kriminalistiku i policijske studije, Krivičnog zakona Srbije, konferencija „Tara“ i „Reiss“, kao i iz nekih doktorskih disertacija vezanih za ovu oblast istraživanje. Nakon obrade teksta, korpus koji sadrži preko 5500 stranica običnog teksta, kreiran je i ...
    Omeka, Wordnet, pretraga punog teksta, morfološka i semantička pretraga teksta, proširenje upita
    ... the method can be achieved by integrating different methods to overcome specific limitations and disadvantages, combining the method with poor specifications with other method with different specifications. For problems with multiple tasks, or subtasks, which can't be solved with one method, hybrid ...
    ... Accrual Method, Accrual Periodicity, Accrual Policy, Alternative Title, Audience, Date Available, Bibliographic Citation, Conforms To, Date Created, Date Accepted, Date Copyrighted, Date Submitted, Audience Education Level, Extent, Has Format, Has Part, Has Version, Instructional Method, Is Format ...
    ... addressees) and relevant to the relationship between them. Suicide notes generally have sentences alluding to the act of killing oneself, or the method of suicide that was undertaken. 6 The contents of a suicide note could be intended to make the addressee suffer or feel guilt. Genuine suicide letters ...

  • Risk Evaluation: Brief Review and Innovation Model Based on Fuzzy Logic and MCDM

    Stevan Djenadic, Milos Tanasijevic, Predrag Jovancic, Dragan Ignjatovic, Dejan Petrovic, Ugljesa Bugaric (2022)
    The risk assessment of engineering systems represents an important part of the quality of service and dependability. The existing methods for risk evaluation use crisp sets for rating partial indicators’ proposition and their cumulative products as an overall indicator. In this paper, existing FMEA and FMECA methods have been improved using the fuzzy expert system for calculating the risk priority number. The application of fuzzy logic allows the use of linguistic descriptions for risk analysis. In this way, the ...
    rizik, inženjerski sistemi, fazi logika, višekriterijumske metode

  • Human factor risk management procedures applied in the case of open pit mine

    Snežana Kirin, Aleksandar Sedmak, Wei Li, Miodrag Brzaković, Igor Miljanović, Ana Petrović, Simon Sedmak (2021)
    Risk management aims to provide a controlled work environment to ensure the safe operation of the high-risk systems. It is a dynamic process which work in a continual state of change. The issue of human factor risk and rules and regulations in open pit mine is a main focus of this paper in order to develop predictive models of behavior of workers in relation to compliance with the procedures and rules. Presented survey was conducted in open pit coal ...
    Upravljanje rizikom, ljudski faktor, bager sa kašikom, metod konačnih elemenata

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • 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
    ... expressed depending on the linguistic variables ‘A’, ‘B’, ‘C’, ‘D’, and ‘E’, in accordance with Figure 3. In this paper, the best-fit method will be used. This method is special in that it allows the possibility of mapping the membership Energies 2019, 12, 4044 7 of 18 composition, because through ...
    ... expressed depending on the linguistic variables ‘A’, ‘B’, ‘C’, ‘D’, and ‘E’, in accordance with Figure 3. In this paper, the best-fit method will be used. This method is special in that it allows the possibility of mapping the membership Energies 2019, 12, 4044 8 of 18 function to classes (14) in ...
    ... Model The analytical hierarchical process (AHP) represents the most commonly used mathematical method in multi-criteria decision making (MCDM). Designed by Saaty [21], from its very appearance, the method has attracted great interest, and today methods of this type are widely used and have broad a ...

  • Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules

    Svetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón (2024)
    The stability analysis of homogeneous rock slope following the Hoek–Brown failure criterion under the hypothesis of different flow rules is performed based on limit equilibrium and finite element methods. The applied failure criterion is the generalized Hoek–Brown that can be introduced as a shear/normal function in analysis applying different flow rules. The results are compared with those obtained by the application of equivalent shear strength parameters of the Mohr–Coulomb criterion, considering that this is still the most widely used ...
    Kružna klizna površ, Huk-Braunov kriterijum loma, Kriterijum popuštanja, Smičuća/normalna funkcija, Nivo napona, Verovatnoća i parametarska analiza

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic

  • Application of ERT in the study of debris-flow source area: Case study Selanac debris flow

    Dragana Đurić, Jelka Krušić, Biljana Abolmasov (2021)