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Упит dcterms_subject_txt:increase productivity

57 items

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... factors geographical and environmental restrictions were taken, the secondary factors were reservoir pressure, productivity index, the characteristics of reservoir fluids, and well productivity characteristics. The importance of this work is reflected in the fact that for the first time the limits of ...
    ... Parameter B6 represents well deviation. With the increase in the angle of deviation of the well, the number of artificial methods that can be used is reduced. Parameter C1 represents corrosion. With the increase in the proportion of compounds that may increase corrosion, the number of artificial methods ...
    ... GOR. With the increase in the gas factor in the production fluid, the efficiency of artificial methods, which can be used, decreases, except in the case of GL where an increase in GOR has a positive effect on the operation of the system. Parameter C4 represents paraffin. With the increase in the amount ...

  • Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia

    Nikola Burazer, Aleksandra Šajnović, Nebojša Vasić, Milica Kašanin-Grubin, Dragana Životić, João Graciano Mendonça Filho, Predrag Vulić, Branimir Jovančićević (2020)
    Stratigraphy,Economic Geology,Geology,Geophysics,Oceanography

  • The Importance of Detailed Groundwater Monitoring for Underground Structure in Karst (Case Study: HPP Pirot, Southeastern Serbia)

    Marina Čokorilo Ilić, Ana Mladenović, Marina Ćuk, Igor Jemcov (2019)
    Geography, Planning and Development,Aquatic Science,Biochemistry,Water Science and Technology
    ... at PP-1 are primarily a result of specific geologic and hydrogeologic conditions on the location of this observation well (fractured aquifer, low productivity), featuring sandstones, claystones and conglomerates (age J1 2+3). However, these changes are also indicative of the hydraulic behavior of the ...
    ... of the karstified zone above the tunnel. There was constant inflow into Section III of the tunnel from the hydrogeologic environment, with a rate increase of 10.8 L/s. At tunnel section 7 + 350 m, concentric outflow was registered in the bottom of the tunnel, resulting in an increased overall groundwater ...
    ... 815 to 4 + 230 m and was corroborated by the qualitative and quantitative parameters of the groundwater sampled from PP-1, in which a significant increase in the Cl ion concentration was detected while the tunnel was being charged. This section of the tunnel, nearly 2500 m long, was identified as the ...

  • Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)

    Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)

  • Simulation of Hydrogeological Environmental Discharge in Case of Interruption Constant Observations

    Marina Čokorilo Ilić, Dragoljub Bajić, Miroslav Popović (2024)
    Monitoring Network, data, hydrogeological environment, tunnel, simulation

  • Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit

    Sanja Bajić, Dragoljub Bajić, Branko Glušćević, Radmila Gaćina (2023)

  • Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event

    Barbara V. Radulović, Lubomir S. Metodiev, Neda Motchurova-Dekova, Platon Tchoumatchenco (2023)
    Brachiopods, taxonomy, biostratigraphy, early Toarcian Anoxic Event, Bulgaria

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... directed to improvement of energy efficiency, increase the use of renewable energy sources and diversification of energy sources and energy imports directions. Key words: availability of energy, energy indicators, energy security Introduction The increase of world population, along with the growth ...
    ... indicate that Serbian energy intensity is high. Such result is the consequence of the inefficient use of energy resources, but also the low economic productivity of the country and low GDP level. Modification of the value of this indicator can be done if GDP is converted from the real national currency at ...
    ... activities in Serbian energy sector should be directed to: y Improvement of energy efficiency, primarily in electricity production and distribution y Increase the use of RES y Diversification of energy sources used in energy transformation, as well diversification of imports directions These activities ...

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation

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

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... company”s competitive advantage. Advances in technology help operations to extract lower-grade ores than those just a few decades ago, to increase productivity and to reduce costs. Operations are meeting stricter environmental requirements for lower emissions, energy, waste and water use. Rehabilitation ...
    ... affect production and productivity of soybean. Deployment of new varieties, high yielding stable production system and adaptability to wide range of different environments, seems to be an important objective for sustainable agriculture and is a viable option to increase soybean area and production ...
    ... volcano-intrusive complexes of calc-alkaline magma whereas in the Golija mountain area magma productivity was small; in some areas, sterile complexes and/or their separate stages exist, as well. Productivity of individual complexes depends on the environment they were intruded in, as well as on magmatic ...

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Projecting short to medium-term effects of carbon emissions trading on Serbia's GDP

    Boban Pavlović, Nikola Trtica (2024)
    This paper presents an approach to assess the short to medium-term effects of the Emissions Trading System (ETS), an economic and climate policy instrument aimed at reducing greenhouse gas emissions, on GDP from the expenditure side. The analysis focuses on Serbia’s electricity sector, which relies heavily on lignite-based pro duction dominated by state-owned enterprises. The obtained projections suggest that in the short term, the introduction of an ETS may lead to slower GDP growth compared to official forecasts. However, ...
    ETS, BDP - rashodni pristup, cene električne energije
    ... that the revenue would increase substantially over time. Williams categorized the revenue's potential uses, finding that reinvesting the tax revenue into growth-promoting, areas could mitigate any adverse economic effects, whereas ineffective use of the revenue could increase the overall cost and ...
    ... that the total installed capacity for electricity production, under the scenario with existing measures, will increase to 9300 MW in 2030 (Republic of Serbia, 2023). This expected increase is mainly attributed to the penetration of RES technologies, such as wind and solar, for electricity production ...
    ... Scenario 2), will not reduce the shock of the ETS introduction and may even increase it in the initial period before the effects of investment effects. It should be noted that this scenario also predicts a more ambitious increase in ETS prices over the years, so the later growth is primarily driven ...

  • Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema

    Svetlana M. Štrbac-Savić (2016-06-10)
    Efikasnost predstavlja preduslov za opstanak svake rudarske kompanije, posebno u uslovima izuzetno konkurentnog trţišnog okruţenja kao što je to rudarska industrija. Efikasnost oznaĉava sposobnost kompanije da ispuni svoje kratkoroĉne ili dugoroĉne ciljeve. Operativna efikasnost se definiše kao odnos izmeĊu ulaznih parametara potrebnih za odvijanje proizvodnje i pokazatelja dobijenih proizvodnjom. U kontekstu rudarskog poslovanja, operativna efikasnost se odnosi na vreme potrebno da se mineralno dobro transformiše u novĉana sredstva. Visoka operativna efikasnost se postiţe kada se ostvari prava kombinacija karakteristika ...
    podzemni rudnik, operativna efikasnost, prognoza, teorija sivih sistema, stohastiĉke diferencijalne jednaĉine, simulacija
    ... mining to produce a mineral asset. It enables management of the mining company to increase productivity, increase profitability, improve competitiveness, use freed-up capacity, and enable company to grow or increase its future market value. Mining company‘s management uses different strategies ...

  • Integrated Stratigraphy of the Middle–Upper Jurassic of the Krížna Nappe, Tatra Mountains

    Renata Jach, Nevenka Đerić, Špela Goričan, Daniela Reháková (2014)
    carbon and oxygen isotopes, radiolarians, calcareous dinoflagellates, radiolarites, Krížna Nappe, West ern Carpathians, Tethys
    ... transgression are linked to increased carbonate precipitation and accumulation (e.g., Jarvis ef al., 2002). It is noteworthy that high biosiliceous productivity associated with a crisis in ca.rbonate production appecars to be corre- lated with positive 8ŠC events (e.g., Bartolini ef a/., 1996; Racki ...
    ... facies (radiolarites). This can be explained by the primary, global co-occurrence of high carbonate 8ŠC values and en- hanced siliceous plankton productivity (e.g., Bartolini ef af., 1996; Racki and Cordey, 2000; Morettini ef al., 2002; O'Dogherty ef al., 2006). The plot of 6 ŠC versus 6O is used ...
    ... values in the Late Callovian, Middle Oxfordian and Late Kimmeridgian (Moluccana Zone) correspond with enhanced radiolarian production. A significant increase in CaCOy content is recorded just above the Late Callovian 6&5C excursion, which coincides with a transition from green to variegated radiolarites ...

  • Избор одговарајуће механичке методе

    Анастасија Мирјанић (2024)
    Експлоатација нафте и гаса кључна је за задовољење глобалних енергетских потреба. Различите методе се користе за ефикасно вађење тих природних ресурса из земљe. Механичке методе експлоатације, које укључују различите врсте пумпи и компресора, играју значајну улогу у овом процесу. У нафтној индустрији, ефикасно вађење нафте и гаса зависи од избора одговарајуће технологије пумпања. Две од најраспрострањенијих технологија су дубинске пумпе са клипним шипкама (енгл. Sucker rod pumps- SRP) и електричне потапајуће пумпе (енгл. Electrical submersible pump- ESP). Овај завршни рад ће ...
    дубинске пумпе са клипним шипкама, замена, електрична потапајућа пумпа, производња, бушотина

  • 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
    ... OD 50 OD uh ı? 249 OD FinalSp. 206 o D |spct ·SpotTme atDump | Auto MG 030 D Cnuka 30. Jleraxban rpopauyH cHrypHux Op3HHa rto JeoHHHaMa |+ Productivity Summary - Full Simulation | m | [ ag Eopot Fleet Size 5 Producton per Operating Hour 196 86 tomne Average Loading Time 400 min DUMP Average ...

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... materials The oil and gas industry must reduce costs and improve operational efficiency by leveraging data and investing in new technology to increase productivity. The use of machine learning can help advance technologies and processes, especially in areas where traditional engineering methods have ...
    ... the discharge pressure. The difference between the discharge and suction pressures represents the pumping pressure, which is an indicator of the increase in potential energy of the fluid. The efficiency of the pump depends on its ability to convert mechanical energy into the potential energy of ...
    ... e Coefficient) Thermistors- These decrease resistance as temperature increases. • PTC -(Positive Temperature Coefficient) Thermistors – These increase resistance as temperature increases. 38 Thermistors are often used where high sensitivity to temperature changes is required. d)Infrared ...

  • Optimizacija dužine strele rotornih bagera u funkciji stabilnosti kosina i efektivnosti rada na površinskim kopovima lignita Srbije

    Branko M. Petrović (2016-07-12)
    Rotorni bageri su mašine koje se u današnje vreme najviše primenjuju uprocesu masovne eksploatacije uglja zahvaljujući, pre svega, nizu tehničkoeksploatacionihprednosti u odnosu na druge vrste bagera. Raznovrsnirudarsko-tehnički zahtevi otkopavanja doprineli su razvoju nekoliko tipova ovihmašina, tako da svaki od njih ima svoje prednosti i nedostatke u odnosu nadrugi tip.Predmet istraživanja u disertaciji odnosi se na izbor optimalnekonstrukcije strele bagera i njene usaglašenosti sa uslovima radne sredine kojiće vladati na površinskim kopovima lignita Srbije, imajući u vidu složene usloveeksploatacije (velika ...
    površinski kop, parametri bloka, kapacitet, rotorni bager, strelabagera, geomehanika, stabilnost kosina, ekonomija
    ... nego bager sa manjim investicionim ulaganjem, a većim prosečnim troškovima proizvodnje. T.S. Golosinski i R.K. Singhal su u svom radu Productivity from bucket wheel excavators [16], razmatrali produktivnost rotornih bagera, naglasivši da ona zavisi od nekoliko faktora i to: broja, veličine ...
    ... ODLAGALIŠTA POVRŠINSKIH KOPOVA, Univerzitet u Beogradu, Rudarsko-geološki fakultet, Beograd, 2008. [16.] Golosinski T. S., Singhal R. K.; PRODUCTIVITY FROM BUCKET WHEEL EXCAVATORS, World Mining Equipment, Tehnical publishing, septembar, 1985. [17.] Gottvald J.; ANALYSIS OF VIBRATIONS OF ...