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Упит dcterms_subject_txt:working environment

446 items

  • Heavy metals in lignite and soil of Kostolac-Kovin coal basin, eastern Serbia - comparative analysis with selected cities in Serbia, region, Europe and world

    Bogoljub Vučković, Bojan Dimitrijević (2023)
    The Kostolac-Kovin coal basin with an area of 320 km2, with 5 separate layers of coal and with a total of about 5.7 Bt of geological resources and reserves represents an exceptional potential for coal production in Serbia. The coal resources listed in this way are not fully exploitable, but they represent potential for consideration. In this paper, we deal with the geochemical characteristics of coal seams and perform a comparative analysis of coal affectation on the environment. With ...
    lignite, heavy metals, concentrations
    ... on. In this paper, we deal with the geochemical characteristics of coal seams and perform a comparative analysis of coal af}ectation on the environment. P/ith 155 analyzes of HM from coal, 45 from ash, 165 from gravel and 30 from soil, we perform analysis of horizontal and vertical distribution ...

  • Flyrock induced by blasting in surface mining

    Milanka Negovanović, Lazar Kričak, Snežana Ignjatović, Stefan Milanović, Jovan Marković, Nikola Simić, Rade Šarac (2022)
    Miniranje predstavlja i dalje najefikasniji i najjeftiniji način eksploatacije velikih količina čvrstih mineralnih sirovina na površinskim kopovima. Energija eksplozije se koristi za fragmentaciju čvrste stenske mase do zahtevane granulacije. Pored pozitivnih efekata miniranja, postoje i određeni neželjeni efekti svakog procesa miniranja koji se mogu javiti, a to su: potresi tla, razletanje komada stene, vazdušni udari, otrovni i zagušljivi gasovi i prašina. Razletanje komada stene je nekontrolisano izbacivanje fragmenata odminirane stenske mase i predstavlja jedan od glavnih izvora materijalne štete ...
    razletanje, bušenje, miniranje, površinska eksploatacija, bezbednost, nesreća

  • 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
    ... , HERVAS, J. & SMITH, J. T. (2014): Recommendations for the quantitative analysis of landslide risk.– Bulletin of Engineering Geology and the Environment, 73, 209–263. doi: 10.1007/s10064-013-0538-8 DEMIR, G., AYTEKIN, M. & AKGUN, A. (2015): Landslide susceptibility mapping by frequency ratio and ...
    ... and comparison of expert opinion to analytical hierarchy process for landslide susceptibility map- ping.– Bulletin of Engineering Geology and the Environment, 67/4, 565–578. doi: 10.1007/s10064-008-0170-1 G eo lo g ia C ro a tica Peshevski et al.: Preliminary regional landslide susceptibility ...
    ... 28-0 SHAHABI, H. & HASHIM, M. (2015): Landslide susceptibility mapping using GIS- based statistical models and Remote sensing data in tropical environment.– Scien- tific Reports, 5/3:15, 9899. doi: 10.1038/srep09899 SHIBIAO, B., QIANG, X., WANG, J. & PINGGEN, Z. (2013): Pre-conditioning Fac- tors and ...

  • Evidence for Ladinian (Middle Triassic) platform progradation in the Gyulakeszi area, Tapolca Basin, Western Hungary: Microfacies Analysis and Biostratigraphy

    Zsolt Robert Nagy, Nevenka Đerić, Sándor Kovács, Anna Oravecz-Scheffer, Felicitász Velledits, Olga Piros, Gabor Csillag (2014)
    anizik, ladin, karbonati, litostratigrafija, biostratigrafija, konodonti, radiolarije, dijageneza
    ... microfacies and bio- stratigraphic analyses were conducted on both units ex- posed in the area in order to characterize the deposi- tional environment and the age of the carbonates. The study also provides an opportunity to improve our un- derstanding on the sedimentary system in the area west ...
    ... Microfauna found in the same unit from the key section at Fels6ors include Ren»gartenella sp. ostracod, which indicates hypesaline depositional environment (Monos- tori 1995). The unit is overlain by poorly fossiliferous dolomite (Megyehegy Dolomite equivalent to the Upper Serla in the Southern ...
    ... in beds #119 and upward in Fels66rs (Kovics 1994, Voros et al. 2003). The G. praebungarica likely signals the establishment of deeper water environment (e.g. not present in the VaAszoly section). Sample Fzs-5 did not yield any pre- served specimens for identification (Fig. 3). Ladinian platform ...

  • A Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice

    Nikola Lilić, Ivan Obradović, Ranka Stanković (2002)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper, we ...
    ... introduction of booster fans is permitted (branches 1, 3, 5, 7, 9, 14, 15, 16). The pressure of the main fan is represented by the characteristic working curve of the fan, approximated by a polynomial giving the dependence of the fan depression from air flow. The SimVent simulator of complex mine ...
    ... validity and effectiveness of the ventilation system followed by suggestions for its improvement. The architecture of the system and the software environment in which the system was developed enable a dynamic communication between different phases of the outlined approach. This yields practically unlim- ...
    ... defense and rescue plan verification, within mine ventilation services, design and research companies. We chose Visual Studio 6.0 as the programming environment for the devel- opment of SimVent. The Unified Modeling Language (UML) has been used as the most appropriate notation, and the system’s architecture ...

  • Callovian (Middle Jurassic) Sphriganaria (Brachiopoda) from the Jordan Valley (Middle East)

    Howard R. Feldman, Barbara V. Radulović, Fayez Ahmad (2023)
    Brachiopods, Middle Jurassic, Sphriganaria, shell microstructure, Ethiopian Province

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    ... at: www.dr.rgf.bg.ac.rs Introduction Arsenic (As) occur naturally in the environment in a number of different forms. Some are toxic, while others are not. Pure arsenic, a gray-colored metal, is rarely found in the environment. Instead, it is usually combined with one or more other elements such as oxygen ...
    ... undertaken in accor- dance with the Drinking Water Sampling and Laboratory Analysis Rulebook [24]. The laboratory for chemical test- ing of the environment at the Faculty of Natural Sciences of the University of Novi Sad used advanced and specialized tools for the precise required analysis. Arsenic ...

  • Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina

    Tina Dašić, Ljiljana Vasić (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry,Global and Planetary Change

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... date, the working hour, and the shift, whereas the time of the day and day of the week are also entered for the purpose of later analyses. The place where the accident occurred is determined by location and site, and a record is also made of whether the accident occurred during working time, or ...
    ... injuries on specific days in percent Figure 6 offers an overview of injuries by body parts and working hours. The most common injuries are limb (leg and arm) injuries that occur in the middle of the working day (shift). The reason for this can be found in the carelessness of workers not wearing proper ...
    ... are: type of injury, body part, severity of injury, worker’s age and qualifications, time dimension, organizational structure of mine, shift and working day in which the injury occurred, the source and cause of the injury, etc. Figure 3 depicts two OLAP cubes. Each cell of the cubes holds a number ...

  • VENTEX: An Expert System for Mine Ventilation Systems Analysis

    Ranka Stanković, Nikola Lilić, Ivan Obradović (1996)
    Analiza sistema za ventilaciju je komleksan proces, koji bazira na proračunu brojnih parametara, koji se odnose na: stanje mreže, provetrenost, stabilnost sistema, gubitke vazduha, klimatske uslove, gasno stanje, ugroženost od požara i opasne prašine. Navedeni problemi se uspešno rešavaju paketom SimVent, ali potpuno razumevanje i korišćenje dobijenih rezultata zahteva angažovanje iskusnog specijaliste iz oblasti ventilacije. Rešenje je nađeno u kreiranju ekspertnog sistema VENTEX, čija je baza znanja formalizacija ekspertskog znanja iz oblasti ventilacije rudnika. U radu je prikazana metodologija ...
    ekspertni sistem, ventilacija
    ... evaluation of the general ventilation state of the mine. An appropriate and reliable solution for this problem is vital for the safety of the working process in mines with underground exploitation. Contemporary mining theory already operates with a number of mathematical methods which can be ...
    ... SimVent. Hence, VENTEX contains the “classical” elements of an expert system: the knowledge base, an inference engine, the user interface and a working memory, but also a module for the interface with SimVent numerical routines, the simulation routines themselves, and a data base used by these ...
    ... the knowledge base and the available information pertaining to the problem at hand. The inference engine stores intermediate results in the working memory. The VENTEX system was developed as a knowledge-based (symbolic) upgrade of the SimVent numerical package and it thus belongs to the ...

  • Sitni, ali bitni: uloga sitnih sisara, herpetofaune i mekušaca u rekonstrukciji pleistocenskih paleosredina

    Katarina Bogićević, Draženko Nenadić, Dragana Đurić, Mihajlo Jovanović, Aleksandra Savković (2023)
    Fosilni ostaci životinja i biljaka imaju važnu ulogu u rekonstrukciji pleistocenskih paleosredina. U ovom radu opisan je značaj tri grupe životinja: sitnih sisara, herpetofaune I mekušaca. Mada je za rekonstrukciju važan sastav čitave asocijacije, nalasci pojedinih vrsta mogu biti dovoljno indikativni da otkriju tip staništa ili klimatske uslove. Posebnu teškoću pri rekonstrukciji paleosredina u Srbiji predstavlja činjenica da klimatske promene na Balkanskom poluostrvu nisu bile tako oštre kao u srednjoj i zapadnoj Evropi, pa ne postoji drastična razlika u ...
    ... of their Pleistocene counterparts were created during warm climatic stages. Very important data on the palaeoclimatic characteristics of the environment can also be obtained by geochemical studies of oxygen isotopes in mollusc shells. Analyzing the isotopic composition of shells from successive ...
    ... remains of molluscs, other significant data useful for the reconstruction of palaecoenvironments can be obtained, such as whether the immediate environment was forest, steppe or open type (wet meadows to steppe), whether these are species that indicate marshy, river and lake environments or are in ...

  • Development of Open Educational Resources (OER) for Natural Language Processing

    Cvetana Krstev, Biljana Lazić, Ranka Stanković, Giovanni Schiuma, Miladin Kotorčević (2015)
    In this paper we present the development of an online course at the edX BAEKTEL platform named “Lexical Recognition in the Natural Language Processing (NLP)”. It is based on the course of the same name for PhD studies at the University of Belgrade, Faculty of Philology. There are not many courses in Computational Linguistics (CL) on OER platforms, and there is none in Serbian either for CL or NLP. We have developed this course in order to improve this ...
    E-Learning, Open Educational Resources, Computational Linguistics, Lexical Resources, edX
    ... none in Serbian either for CL or NLP. We have developed this course in order to improve this situation as it can prove useful both for linguists working in corpus linguistics and computer scientists developing NLP applications. The participant will become familiar with the use of Unitex, the corpus ...
    ... Serbian 13 is presented. [13][14] 2. Unitex corpus processing system is presented from the practical point of view: how to install it and start working with it, main steps of text 12http://edx.baektel.eu/courses/UB_FIL/UB_FIL1/2015/about 13http://www.korpus.matf.bg.ac.rs/korpus/login.php ...
    ... Editors. 2002, Narodna biblioteka Srbije: Belgrade. p. 117-122. [10] Stanković, R., et al., Building terminological resources in an e-learning environment, in The third International Conference on e-Learning. Belgrade, Serbia. p. 114-119. [11] Paumier, S., Unitex 3.1 Beta: User Manual. 2015, ...

  • Towards translation of educational resources using GIZA++

    Ivan Obradović, Dalibor Vorkapić, Ranka Stanković, Nikola Vulović, Miladin Kotorčević (2016)
    ... scoring, created lexicalised reordering tables and Moses configuration file, all with a single command. Before starting the command, we created a working folder in which results were stored. nohup nice ~/mosesdecoder/scripts/training/train- model.perl -root-dir trainedX \ -corpus ~/corpus/edX.clean ...
    ... features.  CAT tool has support for terminology look-up, display and insertion of the search results into the text being translated. 4. ENVIRONMENT FOR TEXT ALIGNMENT Preliminary phase for the text alignment (parallelization) consists of XML document (eXtensible Markup Language) preparation ...
    ... 2016 [11] Meta Texis, http://www.metatexis.com/cat.htm, accessed June, 10th 2016 [12] I.Obradović, R.Stanković, and M. Utvić, An Integrated Environment for Development of Parallel Corpora (in Serbian). In: Die Unterschiede zwischen dem Bosnischen/Bosniakischen, Kroatischen und Serbischen (pp. ...

  • The analysis of the geothermal energy capacity for power generation in Serbia

    Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)
    Renewable Energy, Sustainability and the Environment
    ... separated from the closed loop working fluid used in the turbine by a heat exchanger. The hot water gives up its heat in the heat exchanger to a working fluid with a low boiling point and high vapour pressure at low temperatures when compared to steam. The working fluid is usually ammonia or some ...
    ... conversion of the geothermal energy: (1) Single Cycle Geothermal Power Plants. Generation of power by the conventional steam turbine requires the working fluid temperature of no less than 150 °C. It is available only from very hot geothermal sources or with overheated water flashed to steam. (2) Binary ...

  • WS4LR - a Worksation for Lexical Resources

    Cvetana Krstev, Ranka Stanković, Duško Vitas, Ivan Obradović (2006)
    Lexical Resources, Wordnet, Serbian
    ... the user can retrieve all synsets from the working wordnet that belong to the domain of geology, or more precisely, that contain the element with the content “geology”. New synsets can be added to wordnets using predefined forms. If working simultaneously with two wordnets, the user can ...
    ... Management This module enables concurrent manipulation of a set of dictionaries of lemmas, simple words or compounds, distributed in several files. Working with DELAF type files is not directly supported since this type of files should in general be produced automatically from DELAS by applying the ...
    ... enables easy production of Intex/Unitex graphs that locate all literals from a chosen synset in a text, with or without synset hypernyms. 3.4 Working with Aligned Texts The module uses texts which have previously been aligned using Xalign as an alignment tool and converts them to TMX format, ...

  • Production of electricity from coal-fired power plants and accompanying CO2 emissions: comparison of EU-27 and US

    Uroš Djorgovski, Aleksandar Madžarević, Predrag Jovančić (2023)
    Even in the third decade of the 21st century, large power plants are still responsible for more than half of the electricity production in Europe and US. They predominantly use fossil fuels in their work, which results in the emission of pollutants into the air, soil and water. In addition to the production of electric energy, fossil fuels, including coal, are used for industrial purposes. Although the use of coal, especially in the countries of the European Union, is ...
    CO2, емисија, угаљ, термоелектрана, САД, ЕУ-27
    ... existence and comfort in performing daily activities with an increasingly obvious pressure on the systematic reduction of the impact on the environment in the processes of production, transformation, and consumption of electricity. Total global energy-related greenhouse gas emissions rise by ...
    ... different large industrial plants in the EU-27 countries are emitters of various pollutants from fossil fuels. In order to mitigate the impact on the environment, EU policy aims to reduce emissions from such plants, which gives results already in the first years of the change in the use of energy [1, 2 ...

  • New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)

    Nevenka Đerić, Nataša Gerzina (2014)
    Gornja kreda, radiolarije, Jadar blok, zapadni pojas Vardarske zone, zapadna Srbija
    ... Geological Cor- relation, 22/2, 202—218. CSONTOS, L., GERZINA, N., HRVATOVIĆ, H., SCHMID, S. & TO- MLJENOVIĆ, B. (2003): Structure ofthe Dinarides: a working mod- el.– Ann. Univ. Sci. Budapest., Sect. Geol., 35, 143—144. DIMITRIJEVIĆ, M.D. (1997): Geology of Yugoslavia.- Geol. Inst. GE- MINI Spec. ...
    ... A significant amount of sponge spicules together with abun- dant radiolarians in the studicd samples indicate a relatively proximal slope environment (KITESSLING, 1996). 5. DISCUSSION AND CONCLUSIONS After the Late Jurassic obduction and subsequent erosion in the Dinaridic-Hellenic belt, ...
    ... the studied limestone corresponds to the Struganik Limc- stone which originated on the continental slope, in a rela- tively proximal slope environment which is indicated by a significant amount of sponge spicules together with abun- dant radiolarians. The Santonian age of the analyzed sediments ...

  • 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

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... water pressure on the working environment—coal. Nevertheless, geomechanical laboratory research tests were initially modified to provide reliable data of cutting resistance, especially in the water under different hydrostatic pressures, fully simulating the “in situ” working conditions of mining, i ...
    ... water pressure on the working environment—coal. Nevertheless, geomechanical laboratory research tests were initially modified to provide reliable data of cutting resistance, especially in the water under different hydrostatic pressures, fully simulating the “in situ” working conditions of mining, i ...
    ... “specific bucket-wheel power requirement”. Wagon calculated the specific bucket-wheel power requirement by using power consumption measurements on BWE working. In 1937, Kienast [11] studied the cutting process of bucket chain excavators to determine the optimum slice cross-section for the minimum bucket knife ...