Претрага

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2500 items

  • Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike

    Мирослав Црногорац, Душан Даниловић, Лола Томић (2020)
    ... April). Semantics and complexity of GraphQL. In Proceedings of the 2018 World Wide Web Conference, p. 1155-1164 [4] GraphQL, Retrieved on 10. 9. 2020, from https://graphql.org/ [5] GraphQL vs REST in 2020: A Detailed Comparison, Retrieved on 10. 9. 2020, from https://devathon.com/blog/graphql-vs-or-rest/ ...
    ... study on the recognition of the engineering profession in Serbia was conducted. The recognition was distinguished regarding public image of engineers and the engineer’s self-perception of their profession. The results of the study are presented in the paper. The authors start point was the belief ...
    ... intenzivno koriste velike količine podataka su prepoznale prednosti GraphQL, te ga intenzivno koriste. LITERATURA [1] Di Francesco, H. (2019). Professional JavaScript: fast-track your web development career using the powerful features of advanced JavaScript. Packt Publishing. [2] Facebook, I.: ...

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

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... years. The second Spatial Plan of the Republic of Serbia entered into force on the Ist of December 2010 for the period of 10 years. The Government of Serbia adopted the Decree on establishment of the Program of Implementation of the Spatial Plan of Republic of Serbia from 2010 to 2020, for the period ...
    ... requiring the control of the effluent. On the basis of threshold values of the quality parameters set by the Decree on Classification of Waters, all water flows in Serbia are classified into four classes. The basic principle of domestic regulation is that after the discharge, the class of the recipient ...
    ... change impact on the growth rate and maintain the same management as in the current production. The sowing was fixed on April 20, as usually occurred in our climate and soil conditions, and the optimal fertilization and irrigation was fixed on 50% of the available water as on the Institute fields ...

  • Specifičnosti fundiranja u lesnim naslagama – objekat Poreska uprava Zemun

    Anja Dević (2024)
    U ovom završnom radu prikazani su literaturni podaci koji se odnose na geotehničke karakteristike terena izgrađenih od lesa na primeru šireg istražnog prostora, tzv. Zemunskog lesnog platoa, kao i rezultati detaljnih geotehničkih istraživanja na lokaciji objekta Poreske uprave Zemun. U prvom delu rada prikazani su uslovi nastanka karakteristične makroporozne strukture lesa i njen uticaj na fizičko-mehaničke karakteristike i stabilnost terena izgrađenih od lesa. Na osnovu analize i interpretacije rezultata detaljnih geotehničkih istraživanja na lokaciji objekta Poreske uprave Zemun prikazane su ...
    struktura lesa,stišljivost, nosivost, sleganje, plitko fundiranje i duboko fundiranje
    ... položaj objekta u predmetnom lokalitetu, a sve u kontekstu prikaza morfologije terena. Slika 7. Izvor: https://earth.google.com/web/ 18 Izvor: https://earth.google.com/web/ 5.2. Geološka građa terena Lokacija objekta se nalazi na platou istočnog pojasa Sremske lesne zaravni, Jjužnog obodnog ...
    ... Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Univerzitet ...
    ... ovit, lako drobljiv, mrvljiv pod prstima, srednje do nisko plastičan, deformabilan. U njemu je izražena makroporoznost i sitna cevasta poroznost, osetljive je strukture na dopunska provlažavanja, pri čemu mu se ruši primarna struktura i dolazi do dopunskog sleganja. Ova pojava Je od izuzetne važnosti ...

  • Praktikum za vežbe iz Informatike 1

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Mirjana Banković (2014)
    informatika

  • Supstitucione reakcije Pd(II) kompleksa sa biološki važnim biomolekulima

    Aleksandar M. Mijatović, Jovana Bogojeski (2017)
    Kompleksi Pd(II), supstitucione reakcije

  • Модел померања терена услед утицаја рударских радова на основу радарских сателитских снимака

    Зоран Гојковић (2023)
    Површински коп, као систем који обезбеђује енергетску стабилност или снабдевање сировинама које су од изузетне важности за привредни напредак, својим функционисањем утиче на околна насељена места. Међу бројним аспектима овог утицаја, може се издвојити издвојити и анализирати утицај вертикалних и хоризонталних померања која се јављају на површи терена. Мониторинг вертикалних и хоризонталних померања површи терена околних насељених места треба да има што бољу временску резолуцију (временски период између праћења деформација) како би се вертикална и хоризонтална померања контролисала и ...
    Сентинел 1 интерферометрија, слегање, Перманентни скатерери, Костолац

  • Mikrobiološki diverzitet kiselog jezera Robule i uticaj jezerske vode na oksidaciju sulfidnih minerala

    Srđan B. Stanković (2016-09-11)
    Jezero Robule, formirano u podnožju rudničke raskrivke Oštreljski planir (Rudnik bakra Bor), je nastalo kao posledica rudarskih aktivnosti. Mikrobiološki diverzitet ekstremno kiselog jezera Robule ispitivan je primenom kako klasičnih mikrobioloških metoda (svetlosna mikroskopija i kultivacija na selektivnim podlogama) tako i primenom savremene metode molekularne biologije (analiza polimorfizama terminalnih restrikcionih fragmenata; T-RFLP). Takođe, ispitivan je i potencijal i efikasnost jezerske vode u biološkom luženju mineralnog koncentrata, kao i u bioluženju uzoraka stare flotacijske jalovine Rudnika bakra Bor.Na osnovu dobijenih rezultata ...
    jezero Robule, acidofilne bakterije, bioluženje, kisele rudničke vode, flotacijska jalovina
    ... only after its isolation on selective solid media. Microbial diversity of thick, green colored mat, formed in shallow water, was also analyzed. Light microscopy revealed the presence of the green filamentous algae on the surface of the biomass, while T-RFLP analysis of the 16S rRNA genes amplified ...
    ... that flows into the lake after rainfall. Based on these results a biogeochemical model of iron circulation in the lake was proposed. In the experiments at laboratory scale, efficacy of bioleaching of the mineral concentrate (17 % of copper) with the Lake’s water containing the native bacterial ...
    ... EXTREMELY ACIDIC LAKE ROBULE AND EFFECT OF THE LAKE WATER ON OXIDATION OF SULFIDE MINERALS SUMMARY Lake Robule, is an extremely acidic water body formed at the foot of the overburden Oštreljski planir (the Copper Mine Bor). Microbial diversity of the lake was investigated using both traditional ...

  • 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

  • Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation

    Maja Franković, Nevenka Novaković, Vesna Matović (2015)
    The Dark Gate is the monument of culture, part of the cultural and historical complex of the Belgrade Fortress. It is constructed of limestone blocks that after 270 years of exposure to environmental conditions and different anthropogenic influences show wide ranges of decay forms. During 2007, detail registration of all built limestone microfacies and weathering forms was done using tools of monument mapping. A correlation scheme ‘‘intensity– damage category’’ was made according to the type, intensity, and distribution of ...
    Krečnjak, mapiranje, Indeks raspadanja, brzina raspadanja, progresija
    ... category, is that the half of the gate oriented to the cast is more damaged then the half oriented to the west (Fig. 5 and Table 3). This could be explained by the gate position inside of the fortification; the gate is leaning on the slope which descends from the Upper Town of the fortress. This ...
    ... constructed in the second phase (Fig. 1b). The northern facade consists of a central part, the portal, and side curtain walls without decorations (Fig. ic). Restored cannon openings are placed above the central aisle, toward the south facade. On the eastern side, the gate is leaning on the slope which ...
    ... outburst). The present state of the gate is result of the complex action of the above-mentioned natural factors but some other agents too. On the present appearance of the gate anthropogenic factor has undoubted influence. The selected mode of cleaning in the past has surely contributed to the increase ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... an area with the fifth level of pollution (from 100 to 10,000 t/year) [17]. The impact of mining and energy complex on the air quality is assessed on the basis of the reports of accredited laboratories (Mining Institute in Belgrade) and annual reports on the state of air quality in the Republic of Serbia ...
    ... Table 2. The significance of the environmental aspects is defined based on the value of the product between the degree of impact scores and the occurrence likelihood of critical consequences of work activities, according to the defined criteria (Figure 1). The degree of impact (S) of the environmental ...
    ... flows. The probability of occurrence is mostly valued 1 for all aspects if we rank the effects of damaging the health and safety of employees (K2) and the views of interested parties (K3). It is characteristic that the significance of the aspects has the value of 4 when considering the impact on the financial ...

  • Approach to operational mine planning: Case study Tamnava West

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković (2014)
    ... in the direction of operations advancing, on the parts which correspond to the width of the mining blocks (strips). This width is unique for each coal bench and depends on the characteristics of bucket wheel excavator (BWE) engaged on that bench (it matches the actual width of the block ...
    ... conducted are at the mine site and at the stockyards 2. Homogenization of coal in mine site can be achieved at: - mining block (production of one excavator on one bench), - the connecting conveyors (production of all excavator on different benches). For the management of the coal homogenization ...
    ... determine the reserves of coal and waste, as well as the quality achieved by excavating the each block on each bench. Figure 7. Bench discretization on mining block level 2.1.7. Discretization on mining cuts level of and reporting Discretization of geological model on mining blocks ...

  • Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm

    Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić (2021)
    Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems that may arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while ...
    Energija,energetski inženjering i elektroenergetska tehnologija,obnovljivi izvori energije, održivost i životna sredina,električni i elektronski inženjering,kontrola i optimizacija,inženjering
    ... relation to the defined SEA objectives and indicators, using on the 4 groups of criteria from Table 2. For the expert assessment of the noise impact from the planned Maestrale Ring wind farm, the results were used from a partial assessment based on modeling the spatial dis- persion of the noise. Noise ...
    ... on the basis of the simultaneous operation of all wind turbines and summing the contri- bution of each (Figures 2 and 3). Modeling was carried out for a windspeed of 10 m/s at the height of the wind turbine axis. This value was based on data from the anemometer poles used in the study on the ...
    ... carried out based on the results from the software model used and then incorporated into a matrix representation of multicrite- ria evaluation in SEA. This approach results in determining the ranks of the impacts, on the basis of which a decision is made on the acceptability of the proposed solutions ...

  • Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays

    Vladimir Simić, Dragana Životić, Zoran Miladinović (2021)
    Management, Monitoring, Policy and Law,Nature and Landscape Conservation
    ... certificate/approval/permit (darker colour) for the whole mining cycle. Other important documents at certain stages are discussed in the text. Some changes in the mining legislation in the last ten years were very good, i.e., the possibility to extend the exploration period for metallic ores, and definition ...
    ... of the older, non-CRIRSCO-aligned Soviet state system. The example of clay rocks is used to presents the obvious professional shortcomings of the Serbian Rulebook [52] and the practice in clay exploration. The concept of the Rulebook is based on the classification of mineral reserves of the former ...
    ... According to the authors of this paper, the abso- lute advantage of that source [54] are recommended, not strictly prescribed and manda- tory exploration methods, distances between boreholes, number of samples or sampling intervals. Namely, the original text explicitly states that “the distances shown ...

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system

    Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic (2016)
    The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...
    микроемулзија, толуен, алкил полиглукозид, оксоалкохол етоксилат, појачивач ефикасности, „fish“ дијаграми
    ... increases the efficiency of the surfactant [3-10]. Alcohol ethoxylate surfactants are widely used for microemulsion applications. The phase behavior with respect to the length of the hydrocarbon tails and the number of ethylene oxide (EO) units depends on the purity of alcohol ethoxylates. The structure ...
    ... addition of C„Ga, the homogeneous micro- emulsion region (“fish tail” with the phase sequence @1–%) becomes wider and the efficiency of the surfactant mixture increases slightly. With increasing , the “fish tail! unexpectedly moves downward on the temperature scale despite the hydrophilic nature ...
    ... ethoxylate CysEto) on the behavior of the water/toluene/Lutenso! ON 50 (technical oxoalcohol, i-CyE5) microemulsion system as a function of tempera-– ture and composition has been investigated. The phase behavior of the micro- emulsions was determined by vertica! sections through the Gibbs phase prism ...

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... Application of the results can be used in the decision-making process for prioritizing the rehabilitation of the tailings. The application of the method for the multi-criteria analysis of the impact of pollutants on the environment should be an integral part of the overall management system to the highest ...
    ... on of estimation by using the AHP and PROMETHEE methods, with the aim of ranking the impact on the environment, the ranks are obtained according to their negative impact (Table 12). The comparative analysis of the negative impact on the surrounding ecosystem shows that the least favorable tailing pond ...
    ... water from the tailing pond of the landfill through collectors was placed there when the landfill was constructed, releasing waste into the Ibar River. The tailings are still not managed properly [11]. Flotation landfill Gornje Polje (Figure 2a) is placed on the Ibar River bank, on the part of the terrain ...

  • Part of Speech Tagging for Serbian language using Natural Language Toolkit

    Ranka Stanković, Boro Milovanović (2020)
    Dok se razvijaju složeni algoritmi za NLP (obrada prirodnog jezika), osnovni zadaci kao što je označavanje ostaju veoma važni i još uvek izazovni. NLTK (Natural Language Toolkit) je moćna Python biblioteka za razvoj programa zasnovanih na NLP-u. Pokušavamo da iskoristimo ovu biblioteku za kreiranje PoS (vrsta reči) oznake za savremeni srpski jezik. Jedanaest različitih modela je kreirano korišćenjem NLTK API-ja za označavanje. Najbolji modeli se transformišu sa Brill tagerom da bi se poboljšala tačnost. Obučili smo modele na označenom ...
    obrada prirodnog jezika, mašinsko učenje, neuronske mreže
    ... well to the text from the other domains. That’s why we tested our best taggers on the text that stayed out of the training and validation phases. Results can be seen in Figure 3. Fig. 3. Accuracy of the CRF and Perceptron variants on the test and unseen data Taggers shown in the Figure ...
    ... 180,000 tokens and evaluated on 20,000 tokens. The top performing models were improved with the help of Brill tagger and then tested on both familiar and an unfamiliar text. Best performance is shown by the Perceptron tagger: 92,52 – 95,76% accuracy for the different tagsets. ACKNOWLEDGMENT B.M ...
    ... TAGGING After the resources are ready, the process of tagging is made simple with the help of NLTK. There are a plenty of tagger models packaged in NLTK that can be trained. Every tagger has an evaluation procedure that strips down the tags from the given text, tags the text with the newly created ...

  • Testing the energy value of different types of coal by the method of active thermography

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Predrag Jovančić, Dragutin Jovković (2020)
    In this paper, coal thermograms are presented and analyzed in order to determine their energy value. Two types of coal of different categories, brown and lignite, were selected for active thermographic imaging. The tested coal samples were processed before measurement so that they are similar in dimensions and have two plane-parallel smooth surfaces. The test samples were "primarily" heated under the same conditions and the process of their cooling was monitored by a thermal camera. "Then" they were cooled ...
    Infrared imaging, nondestructive testing, active thermography, coal.

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact UCS of the rock material, and mi) with an increase in the participation of “weaker” rock material was determined based on the test results of uniaxial and triaxial compressive strength. The participation ...
    ... However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact UCS of the rock material, and m;) with an increase in the participation of “weaker” rock material was determined based on the test results of uniaxial and triaxial compressive strength. The participation ...
    ... should be carefully considered. Using the hard rock properties to determine the overall strength of the rock mass is not appropriate. On the other hand, using the intact properties of the weak rock is too conservative as the hard rock skeleton certainly contributes to the overall rock mass strength. Marinos ...