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Упит dcterms_subject_txt:artificial screens

13 items

  • Application of Expansive Mortars for the Formation of Artificial Screens During Blasting in Urban Areas

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Nikola Simić, Jelena Majstorović (2024)
    During construction of buildings in urban areas, sometimes there is a need to blast solid rock mass in the immediate vicinity of the surrounding buildings. In that case, the aim is not only to increase the efficiency of blasting, but also to reduce harmful effects of ground vibration induced by blasting. At the same time, it is very important to protect the buildings located in the safe zone from the blast site as well as remaining rock mass around ...
    expansive mortar, artificial screens, pressure, rock breaking, building foundation

  • Pregled hidrodinamičkih istraživanja bunara sa horizontalnim drenovima numeričkim metodama

    Đorđije Božović, Dušan Polomčić, Dragoljub Bajić (2020)
    U radu je predstavljen pregled odabranih hidrodinamičkih istraživanja realizovanih primenom numeričkih metoda simulacije kretanja podzemnih voda pod uticajem rada bunara sa horizontalnim drenovima. Na osnovu pristupa u matematičkom i hidrauličkom tretiranju, kao i numeričkoj simulaciji bunara sa horizontalnim drenovima na modelima, predstavljeni su najznačajniji aspekti izrade hidrodinamičkih modela ovog kompleksnog tipa vodozahvatnog objekta. Metodologija obuhvata izbor: a) graničnih uslova za simulaciju prirodnih granica, izvora prihranjivanja i dreniranja izdani; b) primenjivanog stepena diskretizacije prostora obuhvaćenog modelom u planu i profilu; ...
    horizontalni bunari, hidraulika bunara, analitički modeli, numerički modeli, hidrodinamičko modeliranje podzemnih voda

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... three-dimensional hydrogeological model of the sectional view of Šumice. The tapped water-bearing horizon is shown in blue, with production well screens shown in green. As previously mentioned, the overlying and underlying strata of this water-bearing horizon are comprised of semi-permable and ...
    ... individual well discharges in the model of Šumice were specified in accordance with both the recorded operating hours and discharge rates. The well screens were Journal of Sustainable Development of Energy, Water and Environment Systems Year 2015 Volume 3, Issue 3, pp 217-229 224 specified ...
    ... y and porosity data. The three-dimensional models easily allowed the consideration of layer heterogeneity and partial penetration of the well screens. As previously stated, particle tracking is suitable for different purposes. In this case, the Modpath code was used to assess the radius of influence ...

  • Two approaches to compilation of bilingual multi-word terminology lists from lexical resources

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2020)
    In this paper, we present two approaches and the implemented system for bilingual terminology extraction that rely on an aligned bilingual domain corpus, a terminology extractor for a target language, and a tool for chunk alignment. The two approaches differ in the way terminology for the source language is obtained: the first relies on an existing domain terminology lexicon, while the second one uses a term extraction tool. For both approaches, four experiments were performed with two parameters being ...
    Linguistics and Language,Software,Artificial Intelligence,Language and Linguistics

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...
    hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije
    ... 2023-10-14 04:20:46 Coupling of artificial intelligence methods in the development of hybrid intelligent systems Ranka Stanković, Ivan Obradović, Nikola Lilić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Coupling of artificial intelligence methods in the ...
    ... bg.ac.rs COUPLING OF ARTIFICIAL INTELLIGENCE METHODS IN THE DEVELOPMENT OF HYBRID INTELLIGENT SYSTEMS Ranka Stanković, Ivan Obradović, Nikola Lilić Rudarsko-geološki fakultet Beograd Abstract: In this paper we present an approach which couples various artificial intelligence (AI) methods ...
    ... function-replacing and intercommunicating hybrid systems. Key words: hybrid intelligent systems, coupled systems, artificial intelligence methods, mining applications of artificial intelligence 1. Introduction AI methods and techniques, such as experts systems, case-base reasoning, machine learning ...

  • Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field

    Bojan Martinović, Dušan Danilović, Branko Grubač, Robert Fadiga (2022)
    Most of the wells in the oilfield Turija are operating with sucker rod pumps, where casing pressure at around 15 bar, and with marginal production rates. The high value of casing pressure indicates high pressure on the face of the formation and depends directly on well productivity. In addition, with increasing value of the casing pressure gas column in the annulus is moving the dynamic fluid level near pump intake and more gas is entering the pump, it results ...
    beam gas compressor, BGC, increase productivity, sucker rod pump, SRP, mature field, artificial lift, production optimisation

  • 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
    ... It is the most practical way to demonstrate the application of Unitex. Graphical materials are used in the form of tables, pictures, print-screens... Wherever it was possible, we tried to provide interaction between the text and the picture. It was done by labelling parts of the text that ...

  • Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs

    Saša Milanović, Ljiljana Vasić (2021)
    Earth and Planetary Sciences (miscellaneous), Water Science and Technology

  • 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
    ... and tubing (1/4 and 3/4) with concrete lining (Figure 1). Three observation wells, PP-1, PP-3 and PP-4, were deep-drilled along the tunnel and the screens installed within the tunnel zone. The HPP has a gravity dam and is usually operated 4–5 h/day. Surface water reservoir is located at an elevation of ...

  • Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... e open-air spaces O may vary in regard to the height of the neighbouring modules M (Figure 7) for functional and privacy requirements. Additional screens may be added for enhanced privacy and additional sun protection of intermediate open spaces. The modest capacities of both enclosed and open-air spaces ...

  • Hidrodinamička analiza procesa starenja bunara sa horzontalnim drenovima na beogradskom izvorištu podzemnih voda

    Đorđije M. Božović (2023)
    Predmet istraživanja doktorske disertacije su bunari sa horizontalnim drenovima beogradskog izvorišta podzemnih voda, drugog najvećeg izvorišta ovog tipa na svetu, čiji je režim rada opterećen procesima intenzivnog starenja prisutnog od samog početka formiranja izvorišta, početkom 1950‒ih godina. Istraživanja sprovedena u okviru izrade disertacije su imala za cilj definisanje nove metodologije izučavanja procesa mehaničkog i biohemijskog kolmiranja drenova izradom detaljnih 3D numeričkih hidrodinamičkih modela, upotrebom postojećih, dostupnih i široko rasprostranjenih računarskih programa. Istraživanja su realizovana simulacijom ostvarenog režima podzemnih voda ...
    modeliranje podzemnih voda, hidrauličke karakteristike drenova, koeficijent propusnosti drenova, prifilterska zona drena, hidraulički otpori na drenovima, kolmiranje drenova, ulazne brzine podzemnih voda, MODFLOW, CLN Package
    ... Conceptual models in hydrogeology, methodology and results; Kazemi, G.A. (Ed.), Hydrogeology – A Global Perspective. 18 Blair, A.H., 1970. Well screens and gravel packs. Groundwater. 8 (1), 10−21. DOI: 10.1111/j.1745−6584.1970.tb01297.x 19 Boreli–Zdravković, Đ., 2014. Analiza problematike simulacije ...
    ... 2012.129 49 Dimkić, M., Ranković, V., Filipović, N., Stojanović, B., Isailovic, V., Pušić, M., Kojić, M., 2013. Modeling of radial well lateral screens using 1D finite elements. Journal of Hydroinformatics, 15 (2): 405–415. DOI: 10.2166/hydro.2012.008 50 Dimkić, M., Pušić, M., 2014. Correlation ...
    ... proposal for consistent usage. Groundwater. DOI: 10.1111/j.1745-6584.2006.00197.x 199 Sterrett, R.J., 2007. Groundwater and wells, 3rd ed. Johnson Screens, New Brighton. 200 Su, G.W., Jasperse, J., Seymour, D., Constantz, J., Zhou, Q., 2007. Analysis of pumping- induced unsaturated regions beneath a ...

  • Старење бунара у алувијалним срединама различитог степена оксичности

    Brankica Majkić (2013-09-27)
    Старење бунара настаје као последица процеса корозије и колмирања. Процесекорозије могуће је спречити уградњом филтерских конструкција од материјалаотпорних на корозију. Колмирање може да настане без обзира на врсту материјалаод кога се праве бунарске конструкције, а процесом може бити захваћенаприфилтарска зона па и зона саме водоносне средине. Из тог разлога тезa јеусмеренa на процесе који доводе до колмирања бунара и последицe опадањaкапацитета водозахватних објеката. Полазна хипотеза је да бунари стареразличитом брзином у срединама различитог степена оксичности. Хидрохемијскеи микробиолошке карактеристике подземних ...
    старење бунара, алувијалне издани, степен оксичности средине,колмирање, бунарски талог, локални хидраулички губитак, дозвољене улазнебрзине
    ... oxic-anoxic conditions resulting from a permanent groundwater water level decrease in its extended area. Low dynamic groundwater levels at the well screens lead to mixing of anoxic groundwater from the saturated part of the aquifer, whose iron concentrations are elevated, with oxygen from the unsaturated ...
    ... backwater levels caused by varying operation modes of the Iron Gate 1 HPP reservoir. The current operating regimes of the wells are such that the well screens remain minor clogging, although certain wells exhibit incrustation within the discharge pipe if installed above the water level of the drainage ...
    ... Fe(II)-oxidizer strain BoFeN1, Geobiology 3, 4, pp. 235-245 66. Kovacs G. and L. Ujfaludi (1983): Movement of fain grains in the vicinity of well screens, Hydrological science – Journal – des Sciences Hydrologiques, 28, 2, 6/1983 67. Коматина М (1976): Хидрогеологија Шумадије, Расправе Завода за ...

  • Osnovi hidrogeologije

    Petar Dokmanović (2021)
    hidrogeologija, atmosferska voda, površinske vode, podzemne vode, vodni bilans, poroznost stena
    ... Živanović V. (2014): Opšta hidrogeologija, Rudarsko-geološki fakultet, Beograd 21. Driscoll GF ( 2003): Groundwater and Wells, Second Edition, Johnson screens, St Paul, Minnesota, USA 22. Dukić, D. (1984): Hidrologija kopna, Naučna knjiga, Beograd. 23. Đorđević, V., Đorđević, P. & Milovanović, D. (1991): ...