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Упит dcterms_creator_txt:Bechtel A. Gawlick Hans Jurgen

1522 items

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • Производња и одржавање рударске опреме на примеру предузећа Колубара метал

    Вања Миловановић (2024)
    У раду је извршено пројектовање технолошког процеса израде вратила на стругу. Кроз теоријску анализу, дати су основни постулати обраде стругањем, стругови као машине алатке, врсте стругова, начини стругања и примењени алати. У практичном делу, дефинисани су редоследи операција и захвата, режими обраде, изабрана машина алатка и алати за све захвате и одређено укупно време обраде потребно да се направи финални производ. Вратило из студије случаја представља компоненту редуктора погона за копање роторног багера SRs.1200.24/4+VR.
    производно машинство, обрада метала резањем, израда вратила на стругу

  • Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu (2020)
    Geochemistry and Petrology

  • Combining Heterogeneous Lexical Resources

    Cvetana Krstev, Duško Vitas, Ranka Stanković, Ivan Obradović, Gordana Pavlović-Lažetić (2004)
    development of lexical resources, morphological dictionaries, WordNet
    ... Device+MusicInstr if more semantics is used. Since a wordnet is not structured as a tree, but rather as an acyclic graph, it is possible that a synset has more than one hypernym, which allows multiple paths from a root node to such a synset. This is the case with the synset (show:3) ‘public ...
    ... representation of XSD schema of Serbian WN. The XML Path Language (XPath) provides a language for addressing parts of an XML document. XPath treats an XML document as a tree of interrelated branches and nodes. A node in a XML document can be an element, attribute, processing instruction, comment, textual ...
    ... consists of a dictionary of simple lemmas, a dictionary of compounds (under construction), the corresponding dictionaries of word forms, and morphological finite-state automata that model certain classes of lemmas. The current size of SMD of simple lemmas is around 65.000, and they produce a dictionary ...

  • Trans-Lithospheric Diapirism as a Possible Mechanism for Ophiolite Emplacement?

    Nikola Stanković, Taras Gerya, Vladica Cvetković, Vesna Cvetkov (2024)

  • Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

    Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)
    sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija
    ... in a metal, cylindrical vessel with a capacity of 8 dm3. Air content in fresh concrete was determined according to standard EN 12350-7 by using the pressure method. For testing, an apparatus was used which consisted of a metal cylindrical vessel with a capacity of 8 dm3 and a special lid with a pump ...
    ... were 2610 kg/m3 and 1.52%, respectively. For making concrete, a crushed gabbro was used as the coarse aggregates (fractions 4/8 mm and 8/16 mm) which had a specific gravity of 2890 kg/m3 and a water absorption of 0.58%. River sand with a nominal maximum size of 4 mm (fraction 0/4 mm), the specific gravity ...
    ... with a side length of 150 mm. Flexural strength was determined in accordance with standard EN 12390-5 and testing was conducted on the prisms 400 mm in length, with a square cross-section sides of 100 mm. A digital hydraulic press “UTC-5600” (Utest, Ankara, Turkey) was used for the testing. A special ...

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... and trace elements in the Kovin lignite (Serbia). Geol. Croat. 2019, 72, 51–79. [CrossRef] 22. Mitrović, D.; Ðoković, N.; Zivotic, D.; Bechtel, A.; Šajnović, A.; Stojanović, K. Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia. Int. J. Coal Geol. 2016, 168, 80–107 ...
    ... hand, the testing wedge that is used for wedging the rock specimens has a wedge angle of 35◦ with a blunter tip of width b = 5 mm and length of l = 65 mm (Figures 7 and 8) [14,17]. σ σ σ (a) (b) Figure 7. Wedge test method: (a) the wedge and (b) wedge position while testing cutting force. This ...
    ... KL = P/L (N/cm′) (3) KA = P/A (N/cm2) (4) Minerals 2021, 11, 564 7 of 17 where: P—force (N), L—length of the specimen (cm’), and A—specimens’ cross-section area (cm2). ′ (a) (b) γ γ γ σ σ σ σ σ Figure 8. Wedge testing method (Orenstein and Koppel): (a) cylindrical (core) sample and ...

  • Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Tina Dašić (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction
    ... located in Serbia, which consists of a strong, karst spring, a thermal karst spring, and a borehole that captures sub-thermal waters, has been studied. A phenomenon which gives rise to the occurrence of karst waters of three different temperatures within a relatively short distance (about 200 m) ...
    ... karst spring, whose temperature is stable and ranges from 10 to 12 ?"C, and, to a lesser extent, via the Krupaja thermal spring, with a constant temperature of 26 "C, in addition to discharges via an artesian borehole with a temperature of18C (Figure 1). Legend: 17 Karst aquifer Intergranular aquifer ...
    ... channels are predisposed by the NE-SW fault. The shallower channels go down to a depth of 20 m, and after 70 m, they exit into a dry siphon hall, while the deeper channel, according to the latest research, goes down to a depth of 123 m [7]. The quantity of water drained from this spring; Sustainabilihy ...

  • Hypogene speleogenesis related to porphyry magmatic intrusions and its influence on subsequent karst evolution in the Peruvian high Andes

    Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre (2022)
    Earth-Surface Processes

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala
    ... sector displayed on the map will have a unique value, along with its azimuth and zenith. Figure 4 shows an example of a direct solar radiation map (also called a sun map) that can be found in the literature (Republic of Serbia, 2018). Precisely, this is a map relating to 399 North latitude for ...
    ... with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time interval. This paper presents a methodology for the application of the ASR tool for the determination of solar energy potential in urban areas. ...
    ... given space and for a specified time interval. The output is a solar map which contains information regarding the quantity of insolation/solar radiation energy for a specified area. Such solar resource calculation and mapping integrated into the SAT is developed 326 by Fu P. and Rich P.M. (in 2000) ...

  • An Italian-Serbian Sentence Aligned Parallel Literary Corpus

    Saša Moderc, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić (2023)
    This article presents the construction and relevance of an Italian-Serbian sentence-aligned parallel corpus, delving into the aligned sentences in order to facilitate effective translation between the two languages. The parallel corpus serves as a valuable resource for language experts, researchers, and language enthusiasts, fostering a deeper understanding of linguistic nuances and cultural expressions. By bridging the gap between Serbian and Italian, this corpus opens new avenues for cross-cultural communication and collaboration, and ultimately contributes to the improvement of language-related ...
    Aligned corpus, parallel corpus, Serbian, Italian, literature

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel (2016)
    General Earth and Planetary Sciences
    ... biotite from a mylonite formed under higher-greenschist facies conditions, sampled within a shear zone with a top-to-the- west sense of shear formed in the Božica magmatic com- plex, yielded a Middle Triassic plateau date (246 + 1 Ma; SM490-I; Table 1; Figs. 2, 14). Thermal evolution of a Lower ...
    ... 106:1665–—1692 Fig.7 a Cross-section EF through the Vrvi Kobila area. b Detail of the map in Fig. 2 with a trace of the cross-section EF. Location of the map relative to Fig. 3 and the Lower Complex (black silhou- ette) is indicated by a black rectangle in the inset. c Thin section of a C' shear bands ...
    ... at a moderate angle, but a significant population of subvertical cleavage striking north to north- east-south to south-west is also observed (Fig. 9b). A sin- gle axis ba moderately plunging towards the south-west of @ Springer Int J Earth Sci (Geol Rundsch) (2017) 106:1665–—1692 a large ...

  • Uticaj površinske obrade kamena na promenu primarne poroznosti

    Ana Radivojević (2024)
    Površinska obrada kamena je izuzetno bitna kod stena koje se koriste u izgradnji svih vrsta objekata. Površinskom obradom se direktno utiče, ne samo na estetska svojstva kamena nego i na njegove fizičko-mehaničke karakteristike. Cilj ovog završnog rada je analiza uticaja poliranja i rezanja kao tehnoloških procesa obrade na poroznost odabranih vrsta arhitektonsko-građevinskog kamena. Ispitivane stene su gabro „Nero Assoluto“, granit sa površinskog kopa „Ploče“, granit African Red, krečnjak sa lokaliteta „Skržut“ i krečnjak poznat pod nazivom „Sirogojno crveni“.
    polirana površinska obrada kamena, rezana površinska obrada, poroznost, kapilarno upijanje vode
    ... granita „African Red”> a 43 3.1.5. Fizička svojstva krečnjaka „Skržut” a 47 3.1.6. Fizička svojstva krečnjaka “Sirogojno crveni” ... 51 4. DISKUSIJA ... anaaaaaaaaaeaaaaa a aaakakve 56 5. ZAKLJUČAK a a aaaa iii aaaaaiaaaaakat 62 LITERATURA „aıynna a nanaanaaaaaaaaaaaaa a aaaaaaaaaNatakvt 63 ...
    ... makroskopski lako uočavaju: muskovit izgleda kao srebrna, a biotit kao crna šljokica. Amfibola ima nešto manje, a u steni je tamnozelene do crne boje. Struktura stene je zrnasta, a tekstura masivna (sl. 3.3). Slika 3.3 – Makroskopski izgled GP: a.) rezana površina; b.)polirana površina Petrografskom ...
    ... ....aaaaaaaa a nanaeaaaaaakakavi 16 2.3. Metodologija ispitivanja ....aaaaaaaaaa a naaaaaaaeaaaeaaaaataket 17 2.3.1. Optička ispitivanja . naaaataaaaaaataotot 17 2.3.2. Specifična i prividna zapreminska masa .........aaaaaaaaaannn 18 2.3.3. Otvorena i ukupna poroznost.....aaaa a anaaanaaaaaataetot ...

  • Analysis and visualization of geophysical well-logging data from closely spaced boreholes

    Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov (2024)
    Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...
    well-logging in karst, water loss, data correlation, data fusion
    ... iPhone AS A TOOL IN STRUCTURAL GEOLOGY Igor Ivanovski, Bojan Maksimov, Gose Petrov, Gorgi Dimov, Milorad Jovanovski, Natasha Nedelkovska — O a 285 Enepruja, Đocu.inu ropuBa u Jar:tepojiHa HeyTpaJIHocT CEEGS PROJECT – A NEW PERSPECTIVE FOR GREEN ENERGY Jris Puković Kartal O a 293 CHCTEM ...
    ... boreholes distributed at a close distance. The survey was carrled out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis and ...
    ... It is especially rare in boreholes at a close distance. The survey was carrled out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. In these investigations, there was a need to carry Oout exXploratory drilling:at ...

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

    Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin (2016)
    ... open-cast mine Tamnava – West Field. The software used in the research provides a portrayal of the 3D distribution of the aquifers present in the study area. As such, the hydrogeologic model constitutes a basis for developing a hydrodynamic (mathematical) model of the groundwater regime. Keywords: h ...
    ... Miocene sands, silt and clay. 3. METHODOLOGY A hydrogeologic model is an interpretation of the dynamic and physical properties of a hydrogeologic system (American Society for Testing and Materials, 2014). According to Polomčić (2001), a hydrologic system is determined by: input elements, ...
    ... model), and - initial conditions, determined by the piezometric head at a certain initial time. 48 Ratković J., Polomčić D., Bajić D., Hajdin B. A hydrogeologic model is the first step in groundwater modeling and precedes a hydrodynamic model. If the hydrogeologic model is not properly defined ...

  • NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands

    Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić (2012)
    Reakcije supstitucije monofunkcionalnog [Ru(terpi)(bipi)(H2O)]2+ kompleksa, gde je terpi = 2,2′:6′,2″-terpiridin i bipi = 2,2′-bipiridin, sa biološki relevantnim sumporo donorskim ligandima, kao što su tiourea, l-metionin, l-cistein i glutation, proučavane su u vodenim rastvorima tehnikom 1H i 13C NMR spektroskopije. Sve reakcije su proučavajne na pH 7,4, u prisustvu fosfatnog pufera, da bi se oponašalo fiziološko okruženje tokom procesa supstitucije. Reakcije se izvode na 295 K pod uslovima reakcija drugog reda. Uočeni rezultati pokazuju da brzina supstitucije snažno zavisi ...
    Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

  • The subthermal potential of karstic groundwater of Kučaj–Beljanica region in Serbia estimated by the multivariate analysis

    Ljiljana Vasić, Dragana Ž. Živojinovic, Vladana Rajaković-Ognjanović, Huang Fen, Cao Jianhua (2021)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • A comparison between ARIMA, LSTM, ARIMA-LSTM and SSA for cross-border rail freight traffic forecasting: the case of Alpine-Western Balkan Rail Freight Corridor

    Miloš Milenković, Miloš Gligorić, Nebojša Bojović, Zoran Gligorić (2023)
    železnica, prekogranični teretni saobraćaj, ARIMA, LSTM, SSA

  • Одређивање резерви нафтног лежишта „Х“ методом материјал баланса

    Александра Петровић (2024)
    Метода материјалног баланса је кључна техника у процени резерви нафте и гаса у лежиштима која омогућава системско прорачунавање доступних резерви. Циљ ове методе је да се прецизно израчунају количине флуида у лежишту на основу доступних PVT података, података о лежишту и производњи. Резултати примене методе материјалног баланса показују да је она ефикасна у пружању кавнтитативних процена, међутим њена тачност зависи од квалитета улазних података. Метода материјалног баланса пружа основу за процену резерви, али може бити подложна грешкама због непрецизности ...
    материјални баланс, прорачун, енергетски режим, притисак, аквифер
    ... EkcntaH3HOHH pe?)KHM a aaaaaaaa a e da aea a aaa a aaaaa a aaaa a aataatakavi 3 2.2. PexxHM pacrBopeHor raca 2.3. Pe>)KHM TacHč KaTIć aatynnan... 2.4. BonoHanopHH pe?KHM alynaaaaa a a dna a aaeaaaeaaa a a aaaaaaeaaaaaaaaeı & 2.5. I paBHTaLHOHH pe?KHM a a a aa a aaaaaaaaaaaaaaaa a aaaaaa a aaaaaaaaaaavt ...
    ... vt 10 2.6. KOoMOMHHOBaHH pe)KHM..aaaaaaaaaaaaaaaaaaaa a a ea a ea a aaaaaeaatatNeket 13 3. JEJHHAUMHA MATEPMJAJIHOT BAJIAHCA ......anaaaaaaanaannne 15 3.1. Vuenihe eHepreTckHx pexxXuMa HcKopHinhesha JICKHIMTA.aaaaaaaaaaaaaaaaa a 26 4. .· XABJIEH H OJIEX-OBA JEJIHAUHHA MATEPMHJAJIHOT BAJIAHCA ...
    ... We/(Eo+Er„, ) (Okotie a Ikporo, 2019) ... .35 Cnaka 4.6. F y oynaKmiju EB, (Okotie a Ikporo, 2019) ... .36 Cnuka 4.7. F/E, y oyHKnuajna We/E, (Okotie a Ikporo, 2019) ... 37 Cnuka 4.8. F y oyaKunja ER.,+E, (Okotie a Ikporo, 2019) ın 38 Cnuka 4.9. F/Eo y oyHgKnunju Ey/Eo (Okotie a Ikporo, 2019).... ...