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Упит dcterms_subject_txt:Standards for LRs

1397 items

  • Mine ventilation system planning using genetic algorithms

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    The most common problem in contemporary mining practice related to the planning and analysis of ventilation systems is the optimization of partially regulated air distribution in mine ventilation networks. This paper presents a two step optimization procedure for partly regulated air distribution in mine ventilation networks. The first step is the determination of air distribution in all branches using the well known Hardy-Cross method. In the second step the distribution and parameters of air flow regulators with minimum engaged ...
    coal, lignite, and peat; ventilation systems; coal mining; underground mining; ventilation; mathematical models; design; air flow; optimization; calculation methods

  • Threshold-induced correlations in the Random Field Ising Model

    Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević (2018)
    Multidisciplinary
    ... data and for the same thresholds as for the distributions shown in Fig.  1b. They (also) follow power-laws = τ−D T T g T T( ) ( / ) ww w w,0 Tw , speci�ed by the value τ = . ± .1 64 0 02Tw for the exponent of the waiting time, and terminated by the cuto� scaling function gw(x), taken for Tw/Tw,0 ...
    ... time T0 and the cuto� waiting time Tw,0 against threshold Vth for a family of curves obtained for di�erent disorders R. For small thresholds, the cuto� waiting time grows as a power law ( ∼ .T Vw,0 th 1 3), and more rapidly than that for larger Vth. �is leads to the conclusion that if the threshold ...
    ... from the same data and for the same thresholds as for the distributions shown in Fig. 1b. They (also) follow power-laws D(Ty) = Tg, (T/T y,9)» specified by the value Tr, = 1.64 + 0.02 for the exponent of the waiting time, and terminated by the cutoff scaling function g,,(x), taken for T,,/T,,9, where T, ...

  • 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)
    ... latter. Groundwater (GW) resources are vital for the economy and society, as well as for the development of both countries. Within the framework of the International Commission for the Protection of ihe Danube River (ICPDR) activities and the Roof Report for 2004 [6], the transboundary acluifer system ...
    ... presence of fresh groundwater, are utilized mostly for drinking water supply and for irrigation. The deeper layers are also used in the water suppiy of some cities (e.g. Szeged) or for geothermal or balneotherapeutical purposes: thermal water is used for recreation and medical purposes in several spas ...
    ... used for municipal water suppiy and irrigation, and the rest is employed for industrial purposes. In Serbia it is assumed that the current exploitation of the transboundary aquifer is around 2.8m3 s-1, of which 7.2m3s-t are r-rsed by individual industry and farms. Groundwater is also used for irrigation ...

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... research proposes a methodology for the determination of the technical potential of waste heat from wastewater treatment facilities for use in district heating systems by heat pump application. Data from existing wastewater treatment facilities are used for providing data for replication in cities without ...
    ... of primary energy savings per capita. These indicators pro- vide the basis for the estimation of recoverable heat energy potential for other cities, with district heating systems and plans for WWTP construction, as well as for the evaluation of effects of utilization of full potential. Based on the ...
    ... recoverable heat energy potential of wastewater is used for evaluation of some effects that could be obtained through its full utilization for heat production in the existing district heating systems. Three groups of indicators are selected for analysis focusing on district heating systems’ energy ...

  • NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands

    Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić (2012)
    Reakcije supstitucije monofunkcionalnog [Ru(terpi)(bipi)(H2O)]2+ kompleksa, gde je terpi = 2,2′:6′,2″-terpiridin i bipi = 2,2′-bipiridin, sa biološki relevantnim sumporo donorskim ligandima, kao što su tiourea, l-metionin, l-cistein i glutation, proučavane su u vodenim rastvorima tehnikom 1H i 13C NMR spektroskopije. Sve reakcije su proučavajne na pH 7,4, u prisustvu fosfatnog pufera, da bi se oponašalo fiziološko okruženje tokom procesa supstitucije. Reakcije se izvode na 295 K pod uslovima reakcija drugog reda. Uočeni rezultati pokazuju da brzina supstitucije snažno zavisi ...
    Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

  • Uniaxial compressive strength test before and after standard fire test on rock mass

    Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović (2022)
    ... recorded. In Figure 2 samples prepared for uniaxial compressive strength test according to SRPS EN 1926 are presented. Figure 2. Samples prepared according to SRPS EN 1926 for compressive strength test In Figure 3 samples prepared for standard fire test according to SRPS EN 1926 are ...
    ... tested for uniaxial compressive strength. Second group of samples consists of 6 samples exposed to standard fire test according to SRPS EN 1363-1, with the intention to test uniaxial compressive strength after standard fire test. For the sandstone rock mass of determined characteristics, for which ...
    ... publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Fifth symposium of the Macedonian Association for Geotechnics ISRM specialized conference © 2022 Macedonian Association for Geotechnics, ISBN 978-9989-2053-4-7 Slobodan Ćorić, Jovan Br. Papić (Eds) Uniaxial compressive strength ...

  • 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
    ... embankment planum for depths > 2.0 m Ev2 > 20 MN/m2, Ev2/Ev1 2.2, Evd > 20 MN/m2 or Rc* > 95%; for railways in the cut Ev2 > 45 MN/m2, Ev2/ > 25 MN/m2 or Rc* > 95% where the ratio Ev2/ smaller than the minimum value prescribed for Ev2. The load-bearing capacity of the embankment layers, except for the load-bearing ...
    ... Note: Until the detailed zoning of Serbia on frost for all railways within the Corridor X project, adopt zone III of the area of frost for calculations. *in the Regulations Sd Table 3.Minimum values of deformability modulus and degree of compaction for embankment [2:37-38] a) Embankment height H > 2 ...
    ... requirements: for the construction and improvement of open track tracks and main tracks on main railways Ev2 > 120 MN/m2 > 50 MN/m2 Rc* for the construction and improvement of open railway tracks and main tracks on regional railways Ev2 > 100 MN/m2, Ev2/Ev1 2.2, Evd > 45 MN/m2, Rc* for the construction ...

  • 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
    ... value Jc: • For Jc = 6, 14 combinations were recorded: 4-6-6, . . . , 9-6-6; • For Jc = 7, 51 combinations were recorded: 4-6-8, . . . , 10-8-6; • For Jc = 8, 65 combinations were recorded: 4-6-10, . . . , 10-10-7; • For Jc = 9, 39 combinations were recorded: 4-6-8, . . . , 10-10-9; • For Jc = 10, 6 ...
    ... the evaluation of new machines is predominantly excellent and good (‘A’ + ‘B’ > 50%). For the old machines, this is only the case for machine B2-O. For the new machines, B2-N is best rated, and for the old B2-O. For all machines, the least represented grades are adequate and poor availability (‘D’ + ...
    ... open-pit mine for the exploitation of lignite. The analysis in this way provides guidance for selection and purchase, searching for weaknesses as well as the management of spare parts. Such an analysis is very important for large industrial complexes such as mines. A possible recommendation for the company ...

  • 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
    ... 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 ...
    ... methodology is proposed and implemented for analysis of obtained indicators, their interactions and specific importance to availability performance. The proposed procedure for availability indicator determination and their evaluation by AHP is implemented for deter- mination of availability – as a dimension ...
    ... nal 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 selection of critical dimensions for functioning of ...

  • Some models for determination of parameters of the soil oscillation law during blasting operations

    Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić (2018)
    ... R´n 1 , where is: K “ v1 ¨ Rn 1 (13) By replacing values for K from Equation (13) into Equation (1) we obtain the equation: v “ v1 ¨ ˆ R1 R ˙n (14) From Equation (14), for R = R1 there is obtained v = v1 for any n, in our case n > 0. For R = Ri, i = 2, 3, ..., N, from Equation (14), we can take ...
    ... quotient of the relative growth of oscillation velocities and reduced distances for Model 2. The link between the parameters K and n is determined by applying the trapezoidal formula for finding the value of definite integral for Model 3. In doing so, it was noted that all three models can be used to calculate ...
    ... n velocities for corresponding reduced distances for models 1, 2, and 3. The survey of reduced distances R, recorded oscillation velocities vr, calculated oscillation velocities vi1, vi2, and vi3, as well as the difference between recorded and calculated soil oscillation velocities for models 1, 2, ...

  • Available technological procedures for capturing CO2 in the industrial and power generation sectors

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2021)
    Climate change is a major environmental issue caused by anthropogenic emissions of greenhouse gases. Capturing CO2 and storing it in suitable geological formations is one of the main technological solutions that can provide mitigation of CO2 emission into the atmosphere. Capturing CO2 represents the first phase in process of carbon capture and storage, and includes the application of various technologies for the separation of CO2 produced in the energy and industrial sectors. There are four main systems for capturing ...
    capturing CO2, power plants, CO2 capture systems, CO2 technologies
    ... and it is mainly applied for capturing CO2 in post-combustion systems [18]. Typical solvents for this technological procedure include liquid ammonia and aqueous alkanolamines such as monoethanolamine (MEA) and diethanolamine (DEA) [4,18]. MEA is the most promising solvent for capturing CO2 with efficiency ...
    ... but the major drawback is very high capital cost and the energy penalty for the reason that large amount of energy is needed for separating oxygen from the air. Conventional technology procedures that could be employed for capturing CO2 from flue gases such as absorption, adsorption, cryogenic ...
    ... procedures for capturing CO2 in the industrial and power generation sectors Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Available technological procedures for capturing ...

  • Project REASONING: Characterization and technological procedures for recycling and reusing of the rudnik mine flotation tailings

    Vesna Cvetkov, Vladimir Simić, Stefan Petrović, Filip Arnaut, Milena Kostović, Dragan Radulović, Jovica Stojanović, Vladimir Jovanović, Dejan Todorović, Nina Nikolić, Jelena Senćanski, Grozdanka Bogdanović, Dragana Marilović (2024)

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

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

  • 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

  • Increasing the Local Road Network Resilience from Natural Hazards in Municipalities in Serbia

    Biljana Abolmasov, Miloš Marjanović, Ranka Stanković, Uroš Đurić, Nikola Vulović (2024)
    lokalni putevi, prirodni hazardi, otpornost na klimatske promene, MaPLoRds

  • A Tel Platform Blending Academic And Entrepreneurial Knowledge

    Ivan Obradović, Ranka Stanković, Jelena Prodanović, Olivera Kitanović (2013)
    ... educators, students, and self-learners to use and reuse for teaching, learning, and research.” [3] In this paper we propose a solution both for making emerging entrepreneurial knowledge available to students in academic institutions, and for updating academic knowledge of graduate students ...
    ... powerful learner management and tracking tools. Adobe Connect for Webinars is an all-in- one solution for digital marketing events, which helps users deliver compelling, immersive events; maximize attendance; and measure results for optimized outcomes (http://wwwimages.adobe.com/www.adobe.com ...
    ... will provide cost effective practical experience for the students through implementation of software based virtual laboratories (VL) for engineering disciplines. BAEKTEL backend control panel also provides life-long learning opportunities for graduate students who started to work in companies ...

  • Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria

    Vladimir Krivošić, Luka Crnogorac, Rade Tokalić (2024)
    The choice of adequate mining machines is one of the most complex problems in the underground exploitation of mineral raw materials. The weight of such a decision is reflected in the high prices of these machines and the occurrence of even greater costs during their use if their choice was wrongly conceived. There are numerous examples from practice in which such decisions were made solely on the basis of comparing the prices of machines, without considering any of the ...
    utovarno-transportna mehanizacija, izbor, TOPSIS, entropija, standardna devijacija, težina kriterijuma

  • 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
    ... MICP applications as well as the determination of mechanisms for process control. Very few studies are oriented to com- prehensive profiling of the MICP through the formation of the whole procedure for the selection of the most potent bacteria for different purposes. In this study, 43 bacterial isolates ...
    ... (Merck, Kenilworth, NJ, USA) was used for checking the possibility of bacterial growth in anaerobic conditions. The bacterial cultures were streaked onto TSA with an addition of 20% Urea and incubated for 5 days at 30 ◦C in the anaerobic jar. Sporulation rates for selected strains as well as reference ...
    ... suitable choice for the MICP process. The selected strains had a standard score (rang of samples according to the deviation and the mean) of 0.996, while a standard score for S. pasteurii DSM 33 and B. pseudofirmus DSM 8715 are 0.775 and 0.726, respectively. The greater standard score for bacterial isolates ...

  • Analysis of the exhaust emissions inventory from auxiliary mining machines

    Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)
    Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...
    emissions, mining, auxiliary machines

  • A Twitter Corpus and Lexicon for Abusive Speech Detection in Serbian

    Danka Jokić, Ranka Stanković, Cvetana Krstev, Branislava Šandrih (2021)
    Uvredljivi govor na društvenim medijima, uključujući psovke, pogrdni govor i govor mržnje, dostigao je nivo pandemije. Sistem koji bi bio u stanju da detektuje takve tekstove mogao bi da pomogne da internet i društveni mediji postanu bolji virtuelni prostor sa više poštovanja. Istraživanja i komercijalna primena u ovoj oblasti do sada su bili fokusirani uglavnom na engleski jezik. Ovaj rad predstavlja rad na izgradnji AbCoSER-a, prvog korpusa uvredljivog govora na srpskom jeziku. Korpus se sastoji od 6.436 ručno označenih ...
    uvredljivi jezik, govor mržnje, srpski, tviter, leksikon, korpus
    ... based on RDF standards for semantic web, using RDF serialisation for data representation. To that end, our approach envisages export of trigger words as lexical data in RDF that is compliant with the The OntoLex Lemon Lexicography Module6, lexicog [5], as an extension of Lexicon Model for Ontologies (lemon)7 ...
    ... publish them in accordance with W3C-standards such as RDF and SPARQL, and to provide links between lexical data sets and other LOD resources [8]. The goal of our research is to make its results compatible with the Linked Data approach, using its set of design principles for sharing machine-readable interlinked ...
    ... Building Language Resources for Abusive Language Detection in Serbian Figure 2 Annotation guidelines in the form of the decision tree. Figure 3 Abusive span annotation entries for one tweet example. 2.3 Annotation of abusive token spans for lexicon building Several systems for the detection of abusive ...