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806 items

  • Definisanje geotehničkih karakteristika terena za potrebe izgradnje stanice za snabdevanje gorivom “OMV” u Trsteniku

    Milica Dutina (2024)
    U ovom Završnom radu prikazana su istraživanja na osnovu kojih su urađeni grafički dio, proračun nosivosti i proračun analize slijeganja terena za potrebe izgradnje benzinske stanice sa pratećim objektima. Detaljno je analiziran prodajni objekat,čelični rezervoar za gorivo i znak. Za proračun graničnog opterećenja korišćena je metoda Mayerhofa, dok je analiza slijeganja urađena Konsolidacionom metodom slijeganja za prodajni objekat i čelični rezervoar za gorivo, a za temelj znaka po principu slijeganja i rotacije krutih temelja - Gorbun Posadov. Sve dobijene ...
    terenska istraživanja, laboratorijska ispitivanja, geotehnička istraživanja, geotehnički model terena, osnovne tehničke karakteristike, analiza slijeganja, proračn nosivosti
    ... kN/m. — Slika 10 - Prikaz modela terena sa znakom 26 5.2. Analiza granične nosivosti i slijeganja temelja Kao što je već rečeno, proračun nosivosti i slijeganja odrađen je za tri geotehnička modela terena. Prvi model terena za prodajni objekat, drugi model za čelični rezervoar za gorivo ...
    ... za tri geotehnička modela terena (pod a je prikazan proračun za prvi geotehnički model terena koji je karakterističan za čelični rezervoar za gorivo, pod b prikazan proračuna za geotehnički model terena za prodajni objekat, dok je pod c prikazan proračun za geotehnički model terena za znak). Dobijene ...
    ... podna pioca 167.4 |167 .0 < l teren P[ Slika 9 - Prikaz modela terena sa prodajnim objektom Pošto su konstruktivna rješenja za sve objekte različita, geotehničke analize su sprovedene pojedinčano za uopšteni geotehnički model terena. 5.1.3. Znak Temelj znaka bi se izveo na temelju samcu ...

  • Preliminary impact assessment of No2 emission from a heating plant on air pollution: case of Zemun, Serbia

    Boban Pavlović, Uroš Pantelić, Marija Živković, Dejan Ivezić (2023)
    The aim of this paper is to provide a preliminary evaluation of the impact caused by NO2 emissions from a heating plant on the local air quality. To model the spatial distribution of NO2 emissions from the heating plant, the AERMOD model was employed. The evaluation was conducted by analyzing and contrasting the simulated NO2 concentration from the heating plant with the overall NO2 concentration recorded at the nearest monitoring station over the entire heating season. The study focused ...
    AERMOD, квалитет ваздуха, моделирање дисперзије загађења, топлана, NO2 загађење

  • Environmental Energy Security Indicators as Tools for Environmental Protection

    Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević (2019)
    Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...
    енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост
    ... remaining two are measurable and they are entering the model through numerical data that are the result of active monitoring. The data are then classified and fed into the analysis model itself in an adequate form. Such data are entered the synthesis model by the phase proposition procedure, where they ...
    ... An analysis of Energy Security has been done with mathematical model which bases are the theory of the fuzzy logic and the fuzzy conclusion considering energy, economic, ecological and social indicators. If the goal of the model is to decide on a scenario assessment that would demonstrate a rational ...
    ... appropriate stage composition with a ranked outcome. The synthesis model is presented in optimal form according to the partial (Pi) and synthetic (M) indicator. M = E; P1 = E1, P2 = E2, P3 = E3 (2) This has been done by tailoring the model in several steps (Figure 1). During the process, data is collected ...

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... 2.3 Geodatabase model The geodatabase model was developed using UML (Unified Modeling Language) and CASE (Computer- Aided Software Engineering) tool Microsoft Visio, which has a developed integration feature with ArcGIS. Figure 1 shows part of the logical data model with basic classes of ...
    ... as well as the site, for example, a pit, a landfill, workshop or plant. Figure 1 shows part of the conceptual data model. Figure 1 Characteristic part of the conceptual model 3. SYSTEM IMPLEMENTATION 3.1 Development environment The relational database management system used was ...
    ... recultivation of abandoned mines in national parks and other protected areas in Vojvodina in compliance with existing legal regulations. The geodatabase model for this application has been developed using UML and CASE tool Microsoft Visio featuring an interface with ArcGIS. The WebGIS application was developed ...

  • 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)
    ... by experimental measurements. Determination of parameters by model 1 The smallest square method is mainly used to obtain the parameters K and n which represents a common model (Simeunović, 1985). Determination of parameters by model 2 Proceeding from the rock mass oscillation law from the equation ...
    ... ležišta. Za određivanje parametara u jednačini Sadovskog, pored uobičajene metode najmanjih kvadrata primenjen je još jedan model. Pri tom je konstatovano da se oba modela mogu koristiti za izračunavanje brzine oscilovanja stenske mase. Ključne reči: radna sredina, miniranje, seizmičko dejstvo ...
    ... Model 1 1.2663 1 34.0616v R  (13) whereby linear dependence between log v and log R has been obtained, expressed by the equation (13), with the linear correlation coefficient r amounting: r = -0.8288. Graphic survey of soil oscillation law is shown in Figure 2. Model 2 1 ...

  • Optimisation of underground mine decline development system using genetic algorithm

    Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović (2014)
    ... (Brazil et al. 2003; 2008). In our model we defined spatial network by nonlinear constrained objective function representing the cost of mine development and ore haulage. To find the minimum value of the objective function we use Genetic algorithm. 2. THE MODEL OF A DECLINE DEVELOPMENT SYSTEM ...
    ... Such network is defined by adequate objective function. Optimisation model is based on the minimisation of the nonlinear constrained objective function representing the cost of mine development and ore haulage. The model is not closed and allows the underground mining engineers to incorporate ...
    ... sections. Access infrastructure designing can be treated as spanning the spatial network which will connect all main terminals (points). In our model we defined spatial network by adequate nonlinear constrained objective function representing the cost of mine development and ore haulage. To find ...

  • From DELA Based Dictionary to Leximirka Lexical Database

    Biljana Lazić, Mihailo Škorić (2020)
    In this paper, we will present an approach in transforming Serbian language Morphological dictionaries from a DELA text format to a lexical database dubbed Leximirka. Considering the benefits of storing data within a database when compared to storing them in textual documents, we will outline some of the functionality that the database has made possible. We will also show how hand-made rules that use category labels lexical entries are marked with can be used to link lexical entries. ...
    Morfološki rečnici, jezički resursi, Leksimirka
    ... adequate markers. 3.2 Leximirka’s lexicographic database model The lexicographic database model of Leximirka, shown in Figure 1, is guided by the Lemon, LMF and Data Category Registry catalog (Stanković et al., 2018). The implemented model provides the ability to store lexico- graphic information ...
    ... lexicographic database and to an online application. In Sections 3.2 and 3.3 we will give a description of Leximirka’s lexicographic database model and data categories model. An overview of the application segments will be provided in Section 4.1. The possibilities for establishing relations among lexical entries ...
    ... ontologies (e.g. by defining morphological categories and synsets) (McCrae et al., 2012). The Lemon model is concise, descriptive, modular and RDF based. At the time of making Leximirka database, Lemon model consisted of five modules: Ontology-lexicon interface – ontolex, Syntax and Semantics – synsem, De- ...

  • Imputing missing data using grey system theory and the biplot method to forecast groundwater levels and yields

    Jelena Ratković, Dušan Polomčić, Zoran Gligorić, Dragoljub Bajić (2022)
    Groundwater management is one of today’s important tasks. It has become necessary to seek out increasingly reliable methods to conserve groundwater resources. Dependable forecasting of the amounts of groundwater that can be abstracted in a sustainable manner requires longterm monitoring of the groundwater regime (rate of abstraction and groundwater levels). Monitoring of the groundwater source for the town of Bečej, Serbia had been disrupted for multiple years. The objective of the paper is to assess the possibility of reinterpreting ...
    upravljanje podzemnim vodama, izvorište podzemnih voda, prognoziranje

  • Integrated energy planning approach for accelerating energy transition of households

    Boban Pavlović, Marija Živković, Dejan Ivezić (2023)
    The success of energy transition planning depends on several influential and variable factors that need to be considered and tracked in modeling to support policymakers. Expert-based energy models are mainly developed following the assumptions of experts and, in most cases, a limited number of stakeholders. This top-down modeling approach will provide satisfactory results in centrally managed energy sectors (electricity generation and distribution, district heating, etc.), where further decisions could be projected relatively precisely. However, the same approach will not ...
    Energetsko planiranje, Integrisano energetsko modeliranje, Energetska tranzicija, Domaćinstva, Individualno grejanje, LEAP

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... of accuracy and AUC of 0.85 was achieved in landslide susceptibility model. The same can be expected for all subsequent models which incorporate the susceptibility model, such as hazard and exposure. On the other hand, risk model cannot be easily validated. Visually it corresponds well with both ...
    ... realistic risk distribution over the populated areas. Intermediate models, such as susceptibility, exposure, hazard etc., as well as the final risk model suggests good performance, both visually and numerically (high accurancy >75% and AUC of >0.85) and justifies landslide assessment in the future for ...
    ... inventory as a reference; establishing connection between landslide and non-landslide occurrences against the conditioning factors – optimizing the model – fitting the classification function; applying the classification function to the unseen instances in the remaining testing/validating area; outputting ...

  • Design of the Opencast Coal Mine Drmno Dewatering System

    Vladimir Pavlović, Dušan Polomčić, Tomislav Šubaranović (2014)
    Development of mining in the opencast mine Drmno from Kostolac basin in Serbia is carried out in the increasingly complex geological and hydro geological conditions with the decline of the coal seams to the alluvial part of Europe's largest river Danube. Greater depth and inflow of groundwater significantly increase costs for dewatering facilities construction with the requirement for optimizing of this more and more important surface mining process. Making decision on screen construction in the opencast mine with redesign ...
    dewatering system, groundwater, hydrodynamic model, dewatering wells, screen, reliability, environmental effects.

  • Hidrogeohemija prirodnih radioaktivnih elemenata u podzemnim vodama Srbije

    Marina D. ĆUK (2018)
    prirodni radioaktivni elementi, podzemna voda, geohemijska sredine, hidrogeohemijski uslovi, logistički model, hidrohemijsko modeliranje

  • Istraživanje mogućnosti korišćenja niskotemperaturnih izvora toplote za održivi razvoj energetike gradova

    Miodrag Grujić (2014)
    održivi razvoj, daljinsko grejanje, model, niskotemperaturni izvori, ELECTRE, Beograd

  • Евалуација утицаја успора ХЕ "Ђердап 1" на формирање режима подземних вода у приобаљу Дунава

    Predrag R. PAJIĆ (2016)
    hirdoelektrana „Đerdap 1“, uspor, režim podzemnih voda, matematički model

  • Hibridni sistem za planiranje i analizu ventilacije rudnika

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilacija rudnika, informacioni sistemi
    ... unešene u MATFLUID grupi podataka. Panel za unos podataka sadrži tri bloka podataka: izvršne komande navode kontrolne parametre u jednostavnom alfanumeričkom formatu, blok podataka o modelu opisuje karaketristike modela i konačno blok za analizu podataka specifikuje opcije unosa izlaza i graničnih uslova ...
    ... U svetskoj rudarskoj praksi razvijeno je nekoliko modela za simulaciju požara: Grojerov (Greuer) model /29/, Simodov (Simode) model /81/, model Džeržinskog (Dziurzynski) /19/ kao i model Danka (Danko) i Muse-Džounsa (Mousset-Jones) /14/. Modeli Grojera i Džeržinskog se odnose na analizu suvih vazdušnih ...
    ... numeričke metode za simulaciju rudničke klime. Model za simulaciju požara u rudničkim ventilacionim mrežama prikazan u ovom poglavlju baziran je na Simodovom modelu, uz određene modifikacije i adekvatno softversko rešenje. Globalni simulacioni model Model se u osnovi sastoji od dva glavna dela: ♦ prvi ...

  • Turbidity simulation for short-term prediction: case study of the karst spring Surdup (Bor, Serbia)

    Marina Pešić, Vesna Ristić Vakanjac, Boris Vakanjac, Kostadin Jovanov (2016)
    Из перспективе снабдевања пијаћом водом, квалитет воде карстних издани је међу највишим, и често захтева само њихову дезинфекцију пре употребе. Међутим, карстне подземне воде изложене су одређеним притисцима. Током сушних периода углавном има мало воде, а током кишних периода има изненадних променa и квалитета и количине воде. Реакција слива на падавине је често брза и варијације у параметрима квалитета и квантитета (истицање, ниво вода, замућеност, укупан број микроорганизама, суспендовани нанос, итд.) су нестабилни. Ово захтева праћење истицања и ...
    водоснабдевање, карстно врело, истицање, мутноћа, симулациони модели

  • Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika

    Saša M. Jovanović (2016-05-16)
    Investiciono okruženje skopčano sa rudarskom industrijom je veoma svojstveno kada seuporedi sa okruženjima koje susrećemo u tipičnim proizvodnim industrijama. Neke odkarakterisitka rudarstva, koje su često naznačene kao jedinstvene su: visok intenzitetinvesticija, dugi predproizvodni periodi, visok rizik i neobnovljivost resursa.Investiranje u sistem otvaranja rudnika predstavlja dobar primer ireverzibilneinvesticije. Takva investicija zahteva pažljivu analizu, jer nakon njene realizacije ona sene može nadoknaditi bez značajnog gubitka vrednosti. Očigledno je da izbor sistemaotvaranja podzemnog rudnika pripada strateškom planiranju...
    otkopavanje; otvaranje; mreže i grafovi; fuzzy skupovi; stohastičkiprocesi; indeks konveksnosti; sistemi podrške odlučivanju
    ... determinističkim modelima. U ovakvim uslovima, matematičko modeliranje sistema zasniva se na proširivanju determinističkog modela uvođenjem slučajnosti. Ove slučajnosti se opisuju terminima verovatnoće i krajnji ishod je stohastički model sistema. Uopšteni oblik stohastičkog modela predstavljen je ...
    ... 03:57:19 Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika;Fuzzy stochastic model of underground development system selection. Saša M. Jovanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Fuzzy stohastički model izbora sistema otvaranja ...
    ... uvođenje što realističnijih pretpostavki u razvoju fuzzy stohastičkog modela za izbor optimalnog sistema otvaranja podzemnog rudnika, (3) postavljanje dinamičkog optimizacionog modela i (4) provera valjanosti postavljenog modela u rešavanju praktičnih problema. 3 1.3 Polazne postavke ...

  • Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling

    Branislav Petrović, Veljko Marinović, Zoran Stevanović (2023)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • The Dictionary of the Serbian Academy: from the Text to the Lexical Database

    Ranka Stanković, Rada Stijović, Duško Vitas, Cvetana Krstev, Olga Sabo (2018)
    In this paper we discuss the project of digitization of the Dictionary of the Serbo-Croatian Standard and Vernacular Language. Scanning and character recognition were a particular challenge, since various non-standard character set encoding was used in the course of the almost 60-year long production of the dictionary. The first aim of the project was to formalize the micro-structure of the dictionary articles in order to parse the digitized text of and transform it into structured data stored in relational lexical database. This approach ...
    computer lexicography, lexical database, language resources, dictionary, Serbian language
    ... published. For the de- velopment of the lexical database model for the DSA, a similar approach was used as in Stanković et al. (2018) for the Serbian morphological electronic dictionary. The main class, in the core of this dic- tionary model, is LexicalEntry, representing a headword of the dictionary ...
    ... as outlined in Stijović and Stanković (2017). Figure 4: Database model with mapped dictionary article segments. For languages with complex morphology, such as Serbian, information about inflection is very im- portant. In our model we used the class Forms to store the information related to the inflected ...
    ... ontologies (TEI, LMF, Ontolex, LexInfo). A lexical database mod- el was designed in compliance with these structured forms, following mostly the lemon model. Mapping of the lexical entry markers to LexInfo and TEI enabled export of the lexical data to the mentioned formats. A software solution for the ...