Претрага

Упит dcterms_subject_txt:groundwater source.0

4920 items

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... where they are removed or accepted for purification. Localization measures for the protection of groundwater are applied in cases where part of the aquifer is already contaminated. The formed source of pollution in the aquifer may, even after liquidation of the sources of pollution, spread to the ...
    ... energy con- sumption for a long time. Underground gasification also has some possible risks, such as potential pollution of groundwater (as well as reduction of groundwater), and the dangers of possible shuffliing of the terrain surface. Such risks can be mitigated by the quality selection of the ...
    ... potential negative effect on the groundwater. Both problems, according to LLNL, can be significantly mitigated by carefully se- lecting the location and with process management. These potential negative impacts on the en- vironment can be reflected in the quality of groundwater resources, while the surface ...

  • 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
    ... 0/2, 0/3, 0/4, 0/5, 0/6, 0/7, 0/8, 1/9, 1/10) Input parameters can be displayed by three indicators (A, B, and C). These indicators are synthesized into one (M) (Figure 3). Figure 3. The input parameter structure. Parameter A1 represents the form and source of energy. Grades are given depending ...
    ... density 810.89–1014.34 kg/m3 oil viscosity 2–681 mPas well deviation 0–35 ° share of corrosive substances 0–5 % solid particle content 0–16 % GOR 10–458 m3/m3 paraffin share 0–20 % water content 0–93 % forms of energy and source 8–9 grade possibility of service 5–7 grade possibility of automatic ...
    ... density 810.89–1014.34 kg/m3 oil viscosity 2–681 mPas well deviation 0–35 ◦ share of corrosive substances 0–5 % solid particle content 0–16 % GOR 10–458 m3/m3 paraffin share 0–20 % water content 0–93 % forms of energy and source 8–9 grade possibility of service 5–7 grade possibility of automatic ...

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid
    ... lignite seams, and covered by thin overburden (Meissner, 1962). Exploitation of the adjacent fields, in particular their dewatering, could lead to the groundwater table lowering and air intru- sion into the coal-bearing strata, even prior to overburden removal from the KNN-W2 sampling area. The low pH itself ...
    ... Extraction of the detritic lignite may re- duce GHG emissions from the aban- doned mines. • Detritic lignites show the potential to serve as a source of coalbed methane. G R A P H I C A L A B S T R A C T a b s t r a c ta r t i c l e i n f o Article history: Received 2 May 2021 Received in revised ...
    ... is associated with restitution of natural water conditions and flooding of the resources left in themines. Flooded lignite mines are a potential source of greenhouse gases (GHG) (CH4, CO2 and N2O), which should be monitored due to growing environmental concerns. Here, we aim to recognize GHG release ...

  • Fizičko-hemijsko raspadanje krečnjaka ugrađenih u objekte Beogradske tvrđave i mogućnost konsolidacije

    Maja Z. Franković (2022)
    Beogradska tvrđava, spomenik kulture od izuzetnog značaja za Republiku Srbiju, izgrađena je od krečnjaka badenske starosti. Njihova litološka heterogenost, u sadejstvu sa uticajima okruženja, rezultira visokim intenzitetima raspadanja. Korelacijom intrinzičnih sa ekstrinzičnim faktorima, definisani su fizičko-hemijski procesi raspadanja ugrađenih mikrofacija krečnjaka. Aplikacijom neorganskih konsolidanata na karbonatnoj bazi (nano-kreča i Ca-acetoacetata) i alkoksisilana, te korelacijom fizičko-mehaničkih svojstava pre i nakon tretmana, ispitana je efektivnost u pogledu zaustavljanja dekohezije krečnjaka. Određivanjem petroloških, tehničkih svojstava i mapiranjem formi raspadanja Mračne kapije kao ...
    krečnjaci, forme i intenziteti degradacije, fizičko-hemijsko raspadanje, konsolidacija, nano-kreč, Ca-acetoacetat, alkoksisilani, Mračna kapija

  • Prilog poznavanju režima i bilansa voda reke Resave

    Marina Mitrašinović, Vesna Ristić Vakanjac, Saša Milanović, Ljiljana Vasić, Dušan Polomčić (2022)
    Sliv Resave zauzima područje između reke Velike Morave i obronaka Kučajsko-beljaničkih planina. Sliv i režim ove reke kontroliše se dvema hidrološkim stanicama: Manastir Manasija (slivno područje u iznosu od 388 km2) i Svilajnac (681 km2). Za potrebe analize režima voda reke Resave i uticaja padavina na formiranje oticaja sa njenog sliva preuzeti su podaci o padavinama sa meteorološke stanice Crni Vrh (1037 m nm) koji odslikava režim gornjeg dela sliva ove reke, i meteorološke stanice Smederevska ...
    Hidrogeološke karakteristike, hidrološke karakteristike, režim voda bilans voda, rijeka Resava

  • State and perspective of individual household heating in Serbia: A survey-based study

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    This paper presents the results of the household survey on individual household heating systems in Serbia. The survey was conducted in the period October to December 2020 with the participation of 1100 households with individual household heating systems. The information collected in the questionnaire can be separated into three main parts: basic household data, current heating system characteristics, and households’ perceptions and attitudes. The survey results provide unique and comprehensive information concerning individual household heating systems and the main ...
    Domaćinstva, Individualni sistemi grejanja, Korišćenje energije, Stavovi potrošača, Anketa, Srbija

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... developed using UML and CASE tool Microsoft Visio featuring an interface with ArcGIS. The WebGIS application was developed using GeoServer, an open source tool in the Java programming language, with integrated PostgreSQL DB and the possibility of generating and publishing WMS, WFS and KML services. ...
    ... completed [5]. U.S. Geoscience Information Network, USGIN is the federal framework for the exchange of information using the free and open source technology that enables connection to similarly configured data exchange networks. This approach offers a long-term solution for the storage and ...
    ... Service) and WFS (Web Feature Service), KML (Keyhole Markup Language) and everything else needed to create a web GIS application. GeoServer is an open source tool designed in Java which enables users to serve spatial data. Its primary role is to serve as connection in an open spatial data infrastructure ...

  • Data from the Digital Repository of the Faculty of Mining and Geology in eScience (eNauka)

    Biljana Rujević, Mihailo Škorić (2024)
    The paper describes linking the Digital Repository of the University of Belgrade, Faculty of Mining and Geology, with the eScience system in terms of transferring metadata about the results of researchers' scientific work. The steps taken to ensure a smooth harvesting of metadata are outlined. Additionally, a presentation of additional improvements to the OAI system is provided, aiming to contribute to the automatic linking of authors with their results in the eScience system.
    репозиторијуми, еНаука, метаподаци, Рударско-геолошки факултет

  • The Nooj System as Module within an Integrated Language Processing Environment

    Ranka Stanković, Duško Vitas, Cvetana Krstev (2008)
    NooJ, electronic dictionary, lexical resources
    ... The user can also use the translation equivalence option which is aimed at locating equivalences in target language for occurrences found in the source language. This is done on the basis of data from wordnets for corresponding languages. Thus the search criteria including dokument, papir, akt ...
    ... the search based on a single keyword In aligned segments retrieved on the basis of the generated query, occurrences that satisfy a query in the source and target languages are highlighted (Figure 9). A filtered TMX document is transformed into XML, TXT and HTML output files by XSLT transformations ...
    ... n of two keywords In aligned segments retrieved on the basis of the generated query, occurrences that correspond to the expanded search in the source and target languages are highlighted (Figure 11). Figure 11. Retrieved aligned segments with highlighted occurrences that correspond to search ...

  • 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

  • Design of the Opencast Coal Mine Drmno Dewatering System

    Vladimir Pavlović, Dušan Polomčić, Tomislav Šubaranović (2014)
    Development of mining in the opencast mine Drmno from Kostolac basin in Serbia is carried out in the increasingly complex geological and hydro geological conditions with the decline of the coal seams to the alluvial part of Europe's largest river Danube. Greater depth and inflow of groundwater significantly increase costs for dewatering facilities construction with the requirement for optimizing of this more and more important surface mining process. Making decision on screen construction in the opencast mine with redesign ...
    dewatering system, groundwater, hydrodynamic model, dewatering wells, screen, reliability, environmental effects.

  • A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)

    Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin (2016)
    ... regime of groundwater source „Kalenić“. In: VRANJEŠ, A. and VUKIĆEVIĆ, M. (eds.) Proceedings of the XV Serbian Symposium on Hydrogeology, Kopaonik, Serbia, 14-17 September, 2016. Belgrade: University of Belgrade - Faculty of mining and geology, pp 173-178. 52 Ratković J., Polomčić D., Bajić D. ...
    ... c characteristics of water supply source „Peštan“ (Lazarevac, Serbia). Vodoprivreda, 45, pp. 55-68. POLOMČIĆ, D., BAJIĆ, D. and ILIĆ, Z. (2014) Implementation of alternative forecasting hydrodynamic during designing of mines defense system against groundwater on opencast mine field C example. In: ...
    ... al. (2016) presented a quantitative 2013 groundwater balance of Tamnava - West Field, and also determined aquifer recharge and discharge in the form of model inflow and outflow. Given that there is a groundwater control system in place, the rate of groundwater extraction is greater than the rate of ...

  • Multihazard Exposure Assessment on the Valjevo City Road Network

    Miloš Marjanović, Biljana Abolmasov, Svetozar Milenković, Uroš Đurić, Jelka Krušić, Mileva Samardžić Petrović (2019)
    Prirodni hazardi, izloženost, klizišta, poplave, bujice, GIS, R

  • Old or New, We Repair, Adjust and Alter (Texts)

    Cvetana Krstev, Ranka Stanković (2020)
    U ovom radu predstavljamo kako se e-rečnici i kaskade transduktora konačnih stanja implementirani u alatu Unitex mogu koristiti za rešavanje tri problema transformacije teksta: ispravljanje tekstova nakon OCR-a, vraćanje dijakritičkih znakova i prebacivanje između različitih jezičkih varijanti.
    ispravka teksta, OCR greške, restauracija dijakritika , jezičke varijante, elektronski rečnik, transduktori konačnih stanja
    ... or more different Ijekavian forms: • cedila,.X+IJK=cjedila(0)_cijedila(5) (the genitive singular form of cjedilo ‘strainer’ vs. the active participle of cijediti ‘to strain’); • posede,.X+IJK=posjede(10)_posijede(0)_posijedje(0) _posjedje(0) (forms of the noun posjed ‘property’ and tree different verbs: ...
    ... presented in Table 8. In the case of Ijekavian source sample, three word forms had to be replaced – vjerovatno ‘probably’, izmjene ‘change’, cijena ‘price’ – and they were all correctly replaced by one offered solution. In the case of the Ekavian source sample, three different word forms had to be replaced ...
    ... “Komo” by Srdan Veljarević. Infotheca Vol. 19, No. 2, December 2019 71 Krstev C., Stanković R., “Old or new, we repair . . . ”, pp. 61–80 the source text the text with suggested corrections KGB mu je ponudio da sarad- juje s njima, i da ce mu onda knjige biti objavljivane. Brod- ski je odbio. I ...

  • A WebGIS Decision Support System for Management of Abandoned Mines

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)
    ... areas. Among geological factors analyzed and evaluated were geological structure and vulnerability of groundwater. The source for assessing the vulnerability of groundwater was the map of groundwater vulnerability of Serbia [14], that integrates a number of factors: the slope of the terrain and its impact ...
    ... For the qualitative variables the score is mapped using a metadata dictionary, like for example for groundwater vulnerability: very high 100, high 80, medium high 60, medium 40, low, 20, very low 0. The complete list of qualitative variables mapping is available in [15]. Authorized users can access ...
    ... activities in the wider area, which is particularly important for Vojvodina, as an agricultural region; and (d) water resources, both surface water and groundwater in the wider area, including hydrogeological and hydro geothermal resources. From the standpoint of environmental management, two distinct groups ...

  • Development and Evaluation of Three Named Entity Recognition Systems for Serbian - The Case of Personal Names

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2019)
    In this paper we present a rule- and lexicon-based system for the recognition of Named Entities (NE) in Serbian news paper texts that was used to prepare a gold standard annotated with personal names. It was further used to prepare training sets for four different levels of annota tion, which were further used to train two Named Entity Recognition (NER) sys tems: Stanford and spaCy. All obtained models, together with a rule- and lexicon based system were evaluated on ...
    NER, Named Entity Recognition Systems, Serbian, Personal Names
    ... 269/220 P9 FULLm 2732/1506 389/253 356/223 FULLf 547/358 72/59 75/42 FULLx 1/1 0 2/2 FIRSTm 253/117 34/21 15/14 FIRSTf 107/69 20/15 6/6 FIRSTx 0 0 0 LASTm 2460/686 358/106 409/115 LASTf 192/93 27/17 73/21 LASTx 20/20 1/1 0 Table 4: Number of NE tags vs. number of differ- ent name forms in the training ...
    ... independent text of the similar structure and content we prepared an additional set of news articles from Danas daily journal. This was one of the source journals for the STUDENTS-GOLD, but for this new sample, we have randomly chosen recent news (from year 2018, that is 2 years after the most recent ...
    ... Serbian are available on NER&BEYOND plat- form, which is presented in Section 6. 3.2 spaCy NER spaCy (Honnibal and Montani, 2017) is a free, open-source library for advanced Natural Lan- guage Processing in Python. For different nat- ural languages, it is able to perform tokeniza- tion, POS-tagging ...

  • Towards Automatic Definition Extraction for Serbian

    Ranka Stanković, Cvetana Krstev, Rada Stijović, Mirjana Gočanin, Mihailo Škorić (2021)
    U radu su prikazani preliminarni rezultati automatske ekstrakcije kandidata za definicije rečnika iz nestrukturiranih tekstova na srpskom jeziku u cilju ubrzanja razvoja rečnika. Definicije u rečniku Srpske akademije nauka i umetnosti (SANU) korišćene su za modelovanje različitih tipova definicija (opisnih, gramatičkih, referentnih i sinonimskih) koje imaju različite sintaksičke i leksičke karakteristike. Korpus istraživanja sastoji se od 61.213 definicija imenica, koje su analizirane korišćenjem morfoloških e-rečnika i lokalnih gramatika implementiranih kao pretvarači konačnih stanja u paketu za obradu korpusa otvorenog ...
    ... definitions of nouns, which were analysed using Serbian morphological e-dictionaries and local grammars implemented as finite state transducers in an open-source corpus processing suite Unitex. The 21 models developed up to the present moment cover 57% of dictionary definitions, 83% of which were fully recognized ...
    ... the model it represents. In the case of successful recognition, a final state transducer produces some result, which can be a modification of the source text by adding tags for types of recognized 1 Unitex/GramLab - Lexicon-Based Corpus Processing Suite (https://unitexgramlab.org/) 2 A part of ...
    ... corpname=SkolKor. The search system for monolingual and multilingual corpora is based on the NoSketch Engine platform (Rychly 2007), which is open-source software - a simplified version of the commercial Sketch Engine tool. Each textbook is supplied with metadata: title, autor, publisher, year of publishing ...

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... household combustion, particularly in countries where this low-rank coal represents the main source of energy. Supplementary Materials: The following are available online at https://www.mdpi.com/2073-436 0/13/5/759/s1. Figure S1: The total ion chromatograms (TICs) of aliphatic fractions of lignite EOM ...
    ... 1 5.2 87.7 12.3 Lignite 400 12.9 11.1 76.0 24.0 Lignite 450 14.8 12.3 72.9 27.1 Lignite 500 16.3 14.6 69.1 30.9 HDPE 400 100 0 0 100 HDPE 450 100 0 0 100 HDPE 500 100 0 0 100 Lignite/HDPE 400 40.2 15.3 44.5 55.5 Lignite/HDPE 450 48.5 18.7 32.8 67.2 Lignite/HDPE 500 52.3 20.4 27.3 72.7 Lignite/HDPE ...
    ... sedimentary organic matter (OM) in the oil shale, coal, and source rocks [27–31]. In the last 15 years, much attention has been given to thermal treatment of coal/plastic blends. Namely, hydrocarbon plastic materials, PE, and PP can be the source of hydrogen during the pyrolysis of hydrogen depleted natural ...

  • Funkcionisanje i uticaj epikarsta na režim, bilans i kvalitet podzemnih voda istočnog dela karstnog sistema Suve planine

    Branislav Z. Petrović (2020)
    Epikarst je deo karstne izdani koji se nalazi u okviru nadizdanske zone i predstavlja kompleksnu tačku dodira i mešanja nekonsolidovanog materijala sa površine terena, ostataka karbonatnih stena izmenjenih korozivnim delovanjem vode, živog sveta i njihovih ostataka, koja je delimično zasićena podzemnom vodom. Kompletan sud o stepenu razvoja i prisustva epikarsta na nekom krečnjačkom terenu moguće je doneti uz multidisciplinarna i obavezna detaljna hidrogeološka istraživanja. Poligon za sprovedena istraživanja je bio karstni masiv Suve planine, koja u geološkom i geografskom smislu ...
    epikarst, karstni sistem, podzemne vode, procesi samoprečišćavanja, hidrohemijski i mikrobiološki procesi u podzemnoj vodi

  • Komparacija metoda XRF i ICP-MS na uzorcima uglja i produkata sagorevanja

    Branko Kostić, Dejan Prelević, Sabina Kovač, Ksenija Eraković, Dragana Životić (2022)
    Ugljevi niskog ranga – ligniti u Republici Srbiji predstavljaju glavnu energetsku sirovinu koja se koristi za proizvodnju električne energije. Rudarstvo u Srbiji doprinosi bruto dodatoj vrednosti sa 1,8% (2020; https://publikacije.stat.gov.rs/). Sagorevanjem ugljeva niskog ranga u termoelektranama generišu se velike količine elektrofilterskog pepela i pepela, koje često predstavljaju jedan od izvora zagađenja životne sredine usled sadržaja toksičnih elemenata. Dalja upotreba produkata sagorevanja zavisi od njihovog sastava i sadržaja toksičnih mikroelemenata. Svakodnevno sagorevanje lignita u termoelektranama uslovljava konstantan monitoring potencijalno toksičnih ...
    ugalj, produkti sagorevanja, XRF, ICP-MS