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Упит dcterms_subject_txt:blok model

806 items

  • 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
    ... of support deformation. Ding-Ping Xu et al. [1] compared the predictions from the rock–soil composite material model, where an analytic method, along with existing data from physical model tests, was applied to acquire results. Good consistency, both in terms of strength and failure Energies 2021, 14 ...
    ... of support deformation. Ding-Ping Xu et al. [1] compared the predictions from the rock-soil composite material model, where an analytic method, along with existing data from physical model tests, was applied to acquire results. Good consistency, both in terms of strength and failure Energies 2021, 14 ...
    ... [11] has presented a multi-step-ahead prediction model, based on a support vector machine, for tunnel surrounding rock displacement forecasting. This paper is divided into five sections. In the section Materials and Methods, we de- scribe the model of forecasting based on observed data and multivariate ...

  • Using Metadata For Content Indexing Within An OER Network

    Ranka Stanković, Olivera Kitanović, Ivan Obradović, Roberto Linzalone, Giovanni Schiuma, Daniela Carlucci (2014)
    ... The model and description of the proposed metadata set are described in Section 5, while section 6 is dedicated to its use case model, followed by conclusions in Section 7. 2. THE BAEKTEL OER FRAMEWORK The basic structure of the BAEKTEL OER framework isillustrated by the deployment model in Figure ...
    ... given. The model and description of the proposed metadata set are described in Section 5, while section 6 is dedicated to its use case model, followed by conclusions in Section 7. 2. THE BAEKTEL OER FRAMEWORK The basic structure of the BAEKTEL OER framework isillustrated by the deployment model in Figure ...
    ... means that resources can be published in different original languages, with adequate support offered for their translation[2]. The conceptual model of the ICT solution for BAEKTEL OER framework envisages a network of nodes offering OER content and a central repository,the BAEKTEL Metadata ...

  • 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

  • Концепт расположивости при дефинисању ефикасног одржавања помоћне механизације на површинским коповима

    Radiša D. Đurić (2016-05-30)
    Оцена расположивости представља основну компоненту уинжењерском управљању опремом. Расположивост је свеобухватни концепткоји представља меру употребног квалитета техничких система, који садржичитаву серију парцијалних индикатора који се односе на време у раду ивреме у отказу система као и на његову функционалну погодност. Овадисертација даје структурну анализу парцијалних индикатора као и развојмодела њихове синтезе на ниво расположивости. Поменути подаци имајухибридни карактер (измерени и експертски добијени) и њихова интеграцијаи синтеза је остварена коришћењем фази пропозиције и фази закључивања.Овакав приступ омогућава оцену техничког система ...
    управљање опремом, инжењерство одржавања,расположивост, фази закључивање, прикупљање података, булдозер
    ... Слика 5.14. Дијаграм фази модела за оцену расположивости 5.3.1. Модел пропозиције Први корак у креирању синтезног модела за процену расположивости (А) је дефинисање лингвистичких променљивих за R, M и F. На овај начин се прави окружење за фази синтезни модел (fuzzy inference engine – фази ...
    ... функционалност развијен модел мерења и статистичке обраде података везаних за радни учинак, односно Докторска дисертација 163 капацитет булдозера. Коришћење паралелно два модела, пружа могућност и верификацију наведеног модела што је овде и учињено. Предложени модел је универзалан и прихватљив ...
    ... ___________________________________________ 127 5.3. Развој синтезног модела за процену расположивости ____________________ 128 5.3.1. Модел пропозиције ____________________________________________________ 130 5.3.2. Модел за фазификацију ______________________________________________ 131 ...

  • Simpson's rule application for experimental determining parameters of rock mass oscillation equation at limestone

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Branko Gluščević, Luka Crnogorac (2021)
    By its form, the use of explosives has a destructive character. However, energy of chemical explosives is tamed and perfected in many effects, so that is developed a series of activities which work is unthinkable without the use of explosives. In mining industry, explosives are most commonly used for exploitation in hard rock mass. Thereby, large amounts of explosives can be used, especially for mass blasting. The application of large amounts of explosives gives auspicious techno – economic indicators ...
    working environment, seismic effects of blasting, oscillation velocity, rock mass oscillation equation, Simpson’s rule

  • Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal

    Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)
    glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo
    ... results for MB removal by KOH activated glucose and fructose samples (measured at 664 nm) were then fitted to different kinetic model: pseudo I, pseudo II and Elovich model, which linear forms are given in Equations (1)–(3) [65], respectively: ln qt qe = k1t (1) t qt = 1 k2·q2 e + 1 qe t (2) ...
    ... – – – – – −3 −3 qt = I + kDt1/2 Figure 8. Linear fits of Pseudo II order kinetic model for KOH activated glucose and fructose samples. Table 7. Characteristic parameters of the Pseudo II order kinetic model for MB removal. Kinetic Parameter AC@G–750–N2–1.0–KOH AC@F–750–N2–1.0–KOH qe, exper (mg/g) ...
    ... rate, and to get additional information about binding mechanism of MB on both adsorbents, the intra-particle diffusion model was also applied. The mathematic form of the diffusion model is given in Equation (4) [65]: qt = I + kDt1/2 (4) where qt (mg/g) is adsorbed amount of MB in time t (min), kD (m ...

  • Application of MCDA in the determination of optimal block size for open-pit modelling and mine planning

    Petar Marković, Dejan Stevanović, Milica Pešić Georgiadis, Mirjana Banković (2021)
    The process of creating a geological block model as the basis for a further detailed design and planning of mining operations is a very responsible task. Errors made during this initial process are transferred to all other phases of the mining project. Certainly, one of the most important decisions for the modelling process is the choice of the appropriate size of the blocks that form the model itself. The determination of the optimal block size is not a simple ...
    dimenzije minibloka, višekriterijumska analiza, AHP, modeliranje ležišta, planiranje na površinskim kopovima

  • Ocena zaštitne funkcije povlatnih slojeva izvorišta Jasik (Opština Batočina) primenom GLA metode

    Rastko Petrović, Igor Jemcov, Dušan Polomčić (2014)
    U cilju utvrđivanja rezervi podzemnih voda i analize uslova zaštite u periodu 2012. i 2013. godine, sprovedena su detaljna hidrogeološka istraživanja na području izvorišta Jasik (opština Batočina). Uspostavljen je sistem monitoringa, čiji je rezultat predstavljao prikupljanje detaljnih hidrogeoloških podataka. Za potrebe analize, izrađen je hidrodinamički model, na osnovu koga je simulirano kretanje podzemnih voda, odnosno, utvrđene zone sanitarne zaštite. Pored navedenog, za potrebe utvrđivanja uslova zaštite podzemnih voda, bilo je neophodno utvrditi podložnost aluvijalne izdani izvorišta Jasik zagađenju. Polazeći ...
    Izvorište Jasik, GLA metoda, zaštita podzemnih voda

  • Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica

    Natalija Momirović, Ratko Kadović, Veljko Perović, Miloš Marjanović, Aleksandar Baumgertel (2019)
    Nature and Landscape Conservation, Soil Science, Agronomy and Crop Science, Water Science and Technology

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... well as the site, for example, a pit, a landfill, workshop or plant. Figure 8 shows part of the conceptual data model. More details about model are available in [15] logical data model of Kanakov. 4.2. Development Environment The relational database management system used was PostgreSQL (The PostgreSQL ...
    ... which depends on the number of factors within the AHP analysis. If CR < 0.1 (10%) the model is consistent. According to Sati a deviation of CR up to 0.3 (30%) is tolerated, but if CR > 0.3 (30%) a correction of the model is necessary. Figure 6 shows the factors taken into account when ranking abandoned ...
    ... with KaNaKov to avoid duplication of resources and to ensure that full synergies are achieved. 4. Materials and Methods 4.1. Geodatabase Model The geodatabase model was developed using Unified Modeling Language (UML) and Computer-Aided Software Engineering (CASE) tool Microsoft Visio (Microsoft Corporation: ...

  • Towards Automatic Definition Extraction for Serbian

    Ranka Stanković, Cvetana Krstev, Rada Stijović, Mirjana Gočanin, Mihailo Škorić (2021)
    U radu su prikazani preliminarni rezultati automatske ekstrakcije kandidata za definicije rečnika iz nestrukturiranih tekstova na srpskom jeziku u cilju ubrzanja razvoja rečnika. Definicije u rečniku Srpske akademije nauka i umetnosti (SANU) korišćene su za modelovanje različitih tipova definicija (opisnih, gramatičkih, referentnih i sinonimskih) koje imaju različite sintaksičke i leksičke karakteristike. Korpus istraživanja sastoji se od 61.213 definicija imenica, koje su analizirane korišćenjem morfoloških e-rečnika i lokalnih gramatika implementiranih kao pretvarači konačnih stanja u paketu za obradu korpusa otvorenog ...
    ... definitions are easy to model. The second group consists of “definitions” of some types of proper names, e.g. names of holidays, saints, monasteries, etc. These definitions are similar to the explanations given in encyclopaedias, they are expressed freely, and are difficult to model with local (shallow) ...
    ... language with the aim of accelerating dictionary development. Definitions in the Serbian Academy of Sciences and Arts (SASA) dictionary were used to model different definition types (descriptive, grammatical, reference-based and synonym-based) having different syntactic and lexical features. The research ...
    ... linguistic constructions, for example, noun phrases. A finite state transducer “passes” through the text it analyses to compare a text chunk with the model it represents. In the case of successful recognition, a final state transducer produces some result, which can be a modification of the source text ...

  • Towards Semantic Interoperability: Parallel Corpora as Linked Data Incorporating Named Entity Linking

    Ranka Stanković, Milica Ikonić Nešić, Olja Perisic, Mihailo Škorić, Olivera Kitanović (2024)
    U radu se prikazuju rezultati istraživanja vezanih za pripremu paralelnih korpusa, fokusirajući se na transformaciju u RDF grafove koristeći NLP Interchange Format (NIF) za lingvističku anotaciju. Pružamo pregled paralelnog korpusa koji je korišćen u ovom studijskom slučaju, kao i proces označavanja delova govora, lematizacije i prepoznavanja imenovanih entiteta (NER). Zatim opisujemo povezivanje imenovanih entiteta (NEL), konverziju podataka u RDF, i uključivanje NIF anotacija. Proizvedene NIF datoteke su evaluirane kroz istraživanje triplestore-a korišćenjem SPARQL upita. Na kraju, razmatra se povezivanje Linked ...
    paralelni korpusi, povezivanje imenovanih entiteta, prepoznavanje imenovanih entiteta, NER, NEL, povezani podaci, NIF, Vikipodaci

  • 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
    ... for their enclosure to provide extended use throughout the year. Depending on the business model, we can consider this starting model to be not economically demanding and able to serve as a demonstration model to attracting further investment and multiplication in other locations. Author Contributions: ...
    ... they were not further discussed in detail at this stage of the research. Figure 7. Model for modular wellness facilities with optional hospitality and medical facilities. 2.2. Architectural Model—Boundary Conditions and Calculation Methodology Following the principles of modular design, modules ...
    ... formulated architectural model for balneological application based on sustainable and green design strategies, the paper illustrated a possible development concept that could serve as an implementation tool for activation at various locations. The developed architectural model showed good potential both ...

  • Analiza mogućnosti primene tehnologije hvatanja i skladištenja ugljenika (CO2) na objektima Nis-A

    Isidora Veljanoski (2024)
    U ovom radu opisana je primena CCUS tehnologija u kompaniji NIS i na koji način treba da se optimizuje da bi projekat bio rentabilan.U prvom i drugom poglavlju opisani su energetski trendovi i tranzicije, razvojni mehanizmi za regulisanje emisije gasova staklene baste i o ugljen-dioksidu kao hemijskom jedinjenju i šta je to CCUS.U trećem, četvrtom i petom poglavlju je detaljnije opisano izdvajanje, hvatanje, transport i skladištenje ugljen-dioksida.Šesto poglavlje i sedmo poglavlje obuhvataju rešenja za razvoj i realizaciju CCUS projekata ...
    energetski trendovi, ugljen-dioksid, CCUS, izdvajanje, hvatanje, transport i skladištenje CO2, ležište, ekonomija projekta
    ... uključuje: Jedinicu za dehidraciju i blok kompresora. Kapacitet ležišta sa ograničenjem je 855 miliona mš. Ekstrahovana smeša ugljovodoničkog gasa i CO» na polju se direktno utiskuje u bušotinu. [21 45 8.1 Ekonomija potencijalnog projekta Ekonomski model je alat koji se koristi za razumevanje ...
    ... predviđanje ponašanje ekonomskih elemenata. Ekonomski modeli predstavljaju pojednostavljene verzije stvarnog ekonomskog sistema, koristeći pretpostavke ı matematičke formule kako bi objasnili kompleksne procese i interakcije. Ekonomski modeli pomažu u predviđanju efekata ekonomskih odluka, testiranju ...
    ... ili poslovnim strategijama. Ekonomski modeli su neophodni za donošenje informisanih odluka u ekonomiji, ali takođe imaju i ograničenja. Oni često ne mogu da obuhvate sve složene faktore stvarnog sveta i zavise od tačnosti pretpostavki koje su ugrađene u model. KPI (Key Performance Indicators) su ...

  • Mafic alkaline metasomatism in the lithosphere underneath East Serbia: Evidence from the study of xenoliths and the host alkali basalts

    Cvetković Vladica, Downes Hilary, Höck Volker, Prelević Dejan, Lazarov Marina (2010)
    Effects of mafic alkaline metasomatism have been investigated by a combined study of the East Serbian mantle xenoliths and their host alkaline rocks. Fertile xenoliths and tiny mineral assemblages found in depleted xenoliths have been investigated. Fertile lithologies are represented by clinopyroxene (cpx)-rich lherzolite and spinel (sp)-rich olivine websterite containing Ti–Al-rich Cr-augite, Fe-rich olivine, Fe–Al-rich orthopyroxene and Al-rich spinel. Depleted xenoliths, which are the predominant lithology in the suite of East Serbian xenoliths, are harzburgite, cpx-poor lherzolite and rare ...

  • Razvoj algoritma fuzzy optimizacije u hidrodinamičkoj analizi za potrebe projektovanja sistema odbrane od podzemnih voda

    Dragoljub Bajić, Dušan Polomčić (2019)
    Sistemi za odbranu od podzemnih voda se koriste za zaštitu hidrotehničkih objekata, priobalja, meliorativnih područja, naselja, rudnika, industrijskih područja, predstavljajući značajne segmente bez kojih bi funkcionalnost ovih objekata i područja bila dovedena u pitanje. Posebno složeni sistemi odbrane od podzemnih voda se karakterišu kod ležišta mineralnih sirovina, imajući u vidu njihovu dinamičnost, koja se ogleda u stalnom širenju ležišta, kao i činjenicu da ova ležišta prodiru duboko u stensku masu različitog strukturnog tipa poroznosti, a time i u podzemne ...
    upravljanje podzemnim vodama, hidrodinamički model, fuzzy logika, trougaoni fuzzy brojevi, znanje eksperta, optimizacija

  • 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

  • A hundred years of Milutin Milanković's climate change theory - geological implications

    Dejan Radivojević (2020)
    Миланковићева теорија циклуса објављена пре сто година је најважнија теорија у наукама које проучавају климу и имала је велики утицај на дисциплине које се баве Земљом. Ипак, његов рад је чекао више од педесет година да би добио потврду. Може се рећи да Миланковићев рад највећи утицај на геологију има у изради астрономске временске скале, подршци хипотези континенталног дрифта и палеоклиматологији. Добри резултати примене астрономске временске скале на неогене седименте иницирали су примену ове методе у мезозојским и у последње ...
    циклостратиграфија, астономска временска скала, геолошка временска скала, климатске промене, континентални дрифт
    ... тога што нам омогућава анализу климатских промена из про - шлости Миланковићева теорија служи и као ос - нова за прављење прогнозних климатских модела. Ови модели омогућавају боље разу мевање разлога настанка климатских промена као и значаја и количине утицаја чо века на њих. Миланковић представља савршен ...
    ... validate his continental drift hypothesis. The factors that cause climate changes enable insight to the geological past, but also the possibility to model the climate conditions which await us in the future. Climate change prediction allowed people, as only being aware of its influence, to act preventively ...
    ... до климатских промена омогућили су поглед у геолошку прошлост, али и моделовање климатских услова који нас чекају у будућности. Прављење прогнозних модела климатских промена омогућава људима, као јединим бићима свесним свог утицаја на њих, да делују превентивно и предузму све мере у циљу смањења емисије ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... economic, exploitation and survey parameters are the four most important criteria considered in the analysis [9–12]. In order to define the evaluation model, it is necessary to analyse the working machines from different manufacturers but of the same class and under the approximately same conditions. In ...
    ... economic, exploitation and survey parameters are the four most important criteria considered in the analysis [9–12]. In order to define the evaluation model, it is necessary to analyse the working machines from different manufacturers but of the same class and under the approximately same conditions. In ...
    ... contains the alternative choices which are analysed according to the defined criteria and sub-criteria. The number of criteria and sub-criteria in the model is unlimited. On the basis of the defined criteria and sub-criteria the dependency between them and the qualities of the considered alternatives is ...

  • Analiza osnovnih indikatora upotrebnog kvaliteta mašina pomoćne mehanizacije na površinskim kopovima uglja

    Stevan Đenadić, Dragan Ignjatović, Predrag Jovančić, Milena Lekić, Žarko Aleksić, Ivan Janković (2022)
    Izbor optimalnog tipa mašine i adekvatno upravljanje kroz životni vek je kompleksan zadatak. Osnovna pitanja koje se postavljaju prilikom rešavanja ovog zadatka vezana su za stepen zadovoljenja rada mašine i optimalan trenutak zamene iste. U ovom radu je izvršena analiza rada dozera koji su u radu na površinskom kopu lignita RB Kolubara. Analizom je obuhvaćeno 4 različita proizvođača dozera a to su: Caterpillar, Dressta i Shantui i Liebherr. Analiza je izvršena sa aspekta ukupnih troškova koji se stvaraju i ...
    rudarstvo, mehanizacija, upotrebni kvalitet, troškovi, empirijska raspoloživost