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Упит dcterms_subject_txt:fluid production

367 items

  • Polyhedral characteristics of the cosalite-type crystal structures

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)
    kristalna struktura, kozalit, poliedarske karakteristike

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... release it for production. The carbon dioxide from the fluid produced at surface is separated and the cycle starts again. CO» flooding is a common method for enhanced oil recovery as the gas mixes with the oil to expand and reduces the viscosity to move the fluid to the production stream [18]. Two ...
    ... stops, solubility trapping where parts of the injected CO2 will dissolve into the saline fluid that is present in the pore spaces within the rock and mineral trapping: where dissolved CO- in the saline fluid reacts with the minerals in the rock. Mineral trapping is deemed the most secure form of ...
    ... power into the system per unit mass. This power input is supplied at the pumps to boost the CO2, the working fluid, and the heating medium: W'input= Žiw'pumpcoz, IL+ zl·W-pumpworking fluid. | + zl·W-pumphcaling medium»(sw) i (4) The thermal efficiency refers to energy efficiency, specifically to ...

  • Towards more sustainable district heating systems in Serbia - Options and obstacles

    Marija Živković, Boban Pavlović, Dejan Ivezić, Miloš Tanasijević, Dejan Stojanović (2024)
    The major share of energy consumed in the building environment is dedicated to meeting heating needs, which makes this sector one of the key players in the transformation of the whole energy system. The accurate approach to the transition process assumes acting on both the demand and supply sides. Lately, the supply side has received more attention, as its transformation is one of the key steps of the energy transition process. District heating systems are recognized as substantial contributors ...
    energetska tranzicija, daljinsko grejanje, dekarbonizacija, obnovljivi izvori energije, prepreke, Srbija

  • 2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja
    ... solution for the daily production of waste causes several threats for the ecosystem such as the production of methane, hydrogen-sulfide, carbon-dioxide and carbon-monoxide. Based on the research of the disposed waste origin and the knowledge of building material production during the twentieth century ...
    ... handled according to Article 4 (Official Gazette of the Republic of Serbia, 1994) i.e. did not succumb to regular air emission measurements and fluid leakage. Results of geoelectrical measurements and borehole data did show a groundwater level existed, that water reacts with the decomposing waste ...
    ... presence of underground waterthat was detected. There are secondary problems that arise with the disposal of PET containers in landfills, such as production of benzene, toluene and ethyl-benzene in gas or leachate form. There is evidence that PET disposal can lead to the upsurge of hydrogen-sulfide ...

  • Business Models for Small-scale Biomass Projects Development

    Dejan Ivezić, Miodrag Gluščević, Marija Živković (2019)
    Biomass is recognized as the most promising renewable energy source in Serbia. The share of biomass in Serbian final energy consumption is over 10%, but mostly related to traditional use in stoves and ovens. One of the main obstacles for wider implementation of contemporary biomass facilities is the inexperience of consumers and stakeholders in the implementation of “innovative” business models, especially in the cases of small-scale projects. In this paper, three different business models (public utility company, energy cooperative ...
    ... 9% or 1.04 million toe, with additional 0.008 million toe (0.09%) of biogas use. Biogas (9,506 toe) has also been used for electricity and/or heat production in autoproducers. Undoubtedly, the potential of biomass as an energy source in Serbia is recognized, but especially in the case of wood fuels, the ...
    ... utilization chain are presented. 2. Biomass project in Kostojevići The existing district heating system in Kostojevići uses heavy fuel oil for heat production to supply households and public buildings. The system has been operating since 2007 as a part of the Public Utility Company (PUC) “BB term” from ...
    ... resource for boiler installation. Resources would be provided from cooperative fund. Cooperative would organize biomass collecting and woodchips production. Cooperative members and other forest owners in Kostojevići and surrounding settlements will provide biomass. In addition, cooperative would organize ...

  • Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković (2021)
    The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...
    In Pit Crushing and Conveying, IPCC, open pit mining, haulage, optimization, costs saving

  • 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
    ... hydrogen, ethanol, chemicals, iron, steel and cement production. There are many opportunities to reduce CO2 emissions in industry sector such as using the natural gas instead of coal, increasing the energy efficiency, and CO2 separation after production using CCS which is one of the leading solutions ...
    ... temperature. This procedure has many applications such as: in natural gas processing, in separation of CO2 from synthesis gas which is used in the production of hydrogen, ammonia, and methanol [21-22]. There are a number of physical absorption processes with different existing commercial physical solvents: ...
    ... purification od CO2 from flue gas stream [4,11]. Therefore, the gas mixture is compressed, cooled and expansed in several stages, and it enables direct production of liquid CO2 that can be stored at high pressure through liquid pumping [11,23]. This technological procedure is applied for streams with high ...

  • Mesozoic carbonate rocks in Serbia used as dimension stone

    Vesna Matović, Tijana Vojnović Ćalić (2016)
    The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...
    Ukrasni kamen, Mezozoik, Krečnjak, Srbija, Petrografija, Fizičko-mehanička svojstva
    ... such as in the production of countertops or home acces- sories, exotic colours and textures are decisive factors in determining stone type. The other crucial criterions for the profitable production of dimension stone are the soundness of the deposit (possibility of block production of a suitable ...
    ... advances in excavation and processing, fur- ther extend modern design possibilities. Today, the global leaders in dimension stone production are Asia (50 % of world production in 2004) and Europe (~38 %) (Montani 2005). With 11.8 Mt exported in 2008, China is the leader in stone exportation. Along ...
    ... considerable quantities of raw materials and semi- finished products and are positioned as leading importers on the world stone market. The high production and processing capacities, along with low labour costs, in countries such as China, India, Brazil, or South Korea, are out-competing the local ...

  • Different aspects of soft computing methods application for blasting in mining

    Katarina Urošević, Jelena Zakonović, Radmila Gaćina (2019)
    Mining is a global industry that is of great importance for every product which is used by human. For mining, process efficiency, reducing production downtime, increasing profitability are all very important. Soft computing tehnologies (SC) are helping in the process of transforming the mining industry into a safer and more environmental friendly industry, but keeping in mind the financial aspect as well. In this paper some of fields of blasting activities in which the SC methods have been applicated, ...
    soft computing, blasting, fuzzy logic, neural networks

  • Asset management and condition monitoring on maintenance of mining equipment lignite mines

    Predrag Jovančić (2016)
    Maintenance strategy, once set, is not permanent. This strategy should be adapted and altered according to the findings, achieved results, variation of mine product prices, changes in the region etc. On the other hand, maintenance strategy should be: safe operation, higher productivity, reduced costs and functionality of complete system. Asset management represents activities through which mine achieves the optimal and sustainable management of its property, in order to meet the plan - realization of production with optimized costs. Therefore, ...

  • Burnishing Versus Smoothing In Ceramic Surface Finishing: A Sem Study

    Ionescu Corina, Volker Hoeck, Crandell Otis N., Šarić Kristina (2014)
    From the Neolithic up to the present, people have used various methods to improve the surface of ceramic objects. In this study, we look specifically at smoothing and pattern burnishing of ceramics produced today by traditional methods. Optical microscopy and SEM show specific surface changes. Smoothing results in an irregular surface, which causes diffused reflection of light. Burnishing produces an even and compact surface, which causes specular reflection and lustre. The results can be used to infer methods of ...

  • 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.

  • Sepiolite – a by-product of exploitation as a potential raw material in Serbian industry

    Radmila Gaćina, Katarina Urošević, Jelena Zakonović (2019)
    This paper gives a brief overview of the sepiolite deposits, the basic properties, and the possibilities of using this mineral. Particular attention is paid to sepiolites from domestic production, especially the use of sepiolites suitable for the development of small businesses and technologies, with a focus on environmental protection. Aim of this paper is to point out importance of this mineral and to draw attention to the use of domestic raw materials. With appropriate mechanical and chemical pretreatments, sepiolite is ...
    sepiolite, by-product, small-scale mine, marginal costs,

  • Uticaj ekstremnih procesa na rizike površinske eksploatacije

    Natalija Pavlović, Tomislav Šubaranović, Dragan Ignjatović (2022)
    Nepredvidivi ekološki negativni slučajni procesi mogu uticati na geo-tehnički sistem pri površinskoj eksploataciji ležišta mineralnih sirovina, što u velikoj meri uvećava rizike i ugrožava realizaciju proizvodnje. Kvantitativna analiza sa proračunom verovatnoća pojava ovakvih ekstremnih događaja i procenom odgovarajućih ekonomskih posledica, posebno u uslovima globalnih klimatskih promena, omogućava definisanje rizika i optimizaciju parametara sistema površinske eksploatacije.

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Resource-based WordNet Augmentation and Enrichment

    Ranka Stanković, Miljana Mladenović, Ivan Obradović, Marko Vitas, Cvetana Krstev (2018)
    In this paper we present an approach to support production of synsets for SerbianWordNet(SerWN)byadjustingPrincetonWordNet(PWN)synsetsusing several bilingual English-Serbian resources. PWN synset definitions were automatically translated and post-edited, if needed, while candidate literals for Serbian synsets were obtained automatically from a list of translational equivalents compiled form bilingual resources. Preliminary results obtained from a setof1248selectedPWNsynsetsshowthattheproducedSerbiansynsetscontain 4024 literals, out of which 2278 were offered by the system we present in this paper, whereas experts added the remaining 1746. Approximately one half of ...
    WordNet, bilingual resources, term alignment, parallel lists
    ... Philology University of Belgrade, Serbia cvetana@matf.bg.ac.rs vitas.marko@gmail.com Abstract In this paper we present an approach to support production of synsets for Ser- bian WordNet (SerWN) by adjusting Princeton WordNet (PWN) synsets using several bilingual English-Serbian resources. PWN synset ...
    ... definitions obtained automatically were accepted with no or mi- nor corrections. These first results are encouraging, since the efficiency of synset production for SerWN was increased. There is also space for further improvement of this approach to wordnet enrichment. 1. Introduction Semantic networks ...
    ... translational equivalents. Finally, we compiled a list of aligned en-sr terms from the web site of the Serbian Institute for Standardization. 3. Production The final parallel list of translation equivalents compiled from all of the abovementioned resources had 151,641 different en-sr term pairs, as ...

  • Димензионисање камионског транспорта јаловине на површинском копу Угљевик Исток 1

    Наталија Терзић (2024)
    Напредовањем рударења дошло је до потребе за експлоатацијом сложенијих и сиромашнијих лежишта, самим тим и повећањем трошкова.Профитабилна експлоатација лежишта минералних сировина захтева детаљну анализу свих техничко-економских фактора.Два најутицајнија фактора на профитабилност експлоатације руде јесу откопавање и транспорт, због тога је неопходно направити изводљив стратешки план који ће бити у складу са свим ограничењима и омогућити испуњавање свих планираних резултата.Транспорт на површинским коповима одвија се паралелно са осталим процесима експлоатације, стога је неопходно да сви системи буду усаглашени како не ...
    дисконтинуални транспорт, откривка, транспортне трасе, Тalpac, капацитет, камион, багер
    ... shifts/Year 748.00 ” Shifts factored by availabilty Average Bucket Cycle Time min 0.50 Production per Operating Hour tonne 418.99 Production per Loader Operating Shift tonne 2,723. Max.prod.based .on 100% avail. Production per Year ftonne 2,037,151 Avg.production factored by avail. Wait Time per Operating ...
    ... Template ftonne 57.56 Operating Hours per Year OpHri/Year 2,674.10 Average Payload tonne 58.32 Production per Operating Hour ftonne 190.45 Production per Loader Operating Shift tonne 681 Production per Year tonne 509,288 Queue Time atLoader min/ Cycle 0.84 SpotTime atloader min/ Cycle 0.40 ...
    ... shifs/year 653,00 ShiMt factored by avalabišty Average Bucket Cycle Time min 100 Production per Operating Hour tonne 828,82 Production per Loađer Operating Shift tonme 6.502 Mka.prod.based om 100% avaš, Production per Year tonne 4246.3115 Avg.productiom factored by avaji _WaitTime per Operating ...

  • Application of the VIKOR Method for Selecting the Purpose of Recultivated Terrain after the End of Coal Mining

    Radmila Gaćina, Sanja Bajić, Bojan Dimitrijević, Tomislav Šubaranović, Čedomir Beljić, Dragoljub Bajić (2024)
    reclamation, coal, sustainable development, multi-criteria decision making, VIKOR method

  • Distant Reading in Digital Humanities: Case Study on the Serbian Part of the ELTeC Collection

    Ranka Stanković, Cvetana Krstev, Branislava Šandrih Todorović, Duško Vitas, Mihailo Škorić, Milica Ikonić Nešić (2022)
    In this paper we present the Serbian part of the ELTeC multilingual corpus of novels written in the time period 1840-1920. The corpus is being built in order to test various distant reading methods and tools with the aim of re-thinking the European literary history. We present the various steps that led to the production of the Serbian sub-collection: the novel selection and retrieval, text preparation, structural annotation, POS-tagging, lemmatization and named entity recognition. The Serbian sub-collection was published ...
    Corpus, Distant Reading, Digital Humanities, Linked Data, Named Entity Recognition, Text Analytics

  • Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata

    Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović (2012)
    ... Geology in Belgrade for development of GIS applications. Thematic classes presented in this paper encompass only a part of the data related to mine production, and pertain to an important segment that demands visual representation. More precisely, the paper tackles exploration works, sample analysis, ...
    ... create regional and detailed maps of both active and prospective open pits, model the geology and the terrain, estimate the reserves, plan the yearly production, monitor statistical data on exploitation costs, monitor the position and availability of mining equipment (excavators, conveyor belts, trucks ...
    ... površinskog kopa “Polje G”). Open pit "Field G" is currently not in function. Its opening, preliminary scheduled for 2015, will provide continuous coal production for the “Nikola Tesla” power plant, even after the open pit “Veliki Crljeni” is closed. The geodatabase has been populated with data in two ways: ...