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Упит dcterms_subject_txt:Gas Hydrate Formation

343 items

  • 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
    ... for tritium, 5H + žHe, and noble gas content analysis were transported to the laboratory of the Institute for Nuclear Research, Hungarian Academy of Sciences Bem tćr 18/c, 4026 Debrecen, Hungary, where they were prepared and analyzed using, a VG5400 noble gas mass spectrometer [19,20]. Sampling ...
    ... interaction, groundwater mixing, with water of different hydrochemical composition, human activity, etc. [3,8-12]. The conditions required for the formation of subthermal and thermal karst ground- waters were created by the process of deep karstification within karst systems, as well as hrough the ...
    ... within the Beljanica Massif, which is why determining, the age of this spring, was of great importance for defining, the conditions of groundwater formation and the depth of groundwater circulation. The thermal spring is located at a distance of about 50 m from the cold Krupaja Spring; it emerges at ...

  • Adsorption and degradation of some psychiatric drugs by sol-gel synthesized titania-based photocatalysts: influence of tungsten and sodium content

    Nina L. Finčur, Maja J. Šćepanović, Mirjana Grujić-Brojčin, Biljana F. Abramović, Jugoslav B. Krstić, Aleksandar Kremenović, Tatjana Srećković, Aleksandar Golubović (2019)
    Mesoporous anatase nanopowders were doped with 0.05−0.5 mol% of W6, in order to obtain more efficient photocatalyst than TiO2 Degussa P25 in the degradation of amitriptyline (AMI) under simulated solar irradiation (SSI). Dominant XRPD peaks were ascribed to anatase phase, with additional peaks which could correspond to brookite, TiO2 bronze and sodium titanate, Na2Ti9O19. The Raman scattering measurements have confirmed anatase as dominant phase, with broad Raman feature at ~270 cm−1 possibly related to Ti–O–Na stretching vibration. All W-doped ...
    Sol-gel synthesis, Doped titania nanopowders, XRPD, Raman spectroscopy, Adsorption and photocatalytic degradation, Psychiatric drugs

  • Geotechnical conditions of “Debelo brdo” tunnel construction on the highway E-80: Nis-Merdare-Pristina (“Peace Highway”)

    Dragoslav Rakić, Irena Basarić Ikodinović, Radojica Lapčević, Dragan Lukić (2024)
    The construction of the highway E-80 has begun in Serbia, which will represent the traffic hub of the Western Balkans and will be part of the main regional transport network of Southeast Europe. Its total length through Serbia is 77 km, and one part of the route is designed through a typical plain terrain, while a larger part of the route passes through hilly terrain. The construction of the tunnel “Debelo brdo” is planned partly in an open cut ...
    „Debelo brdo“ tunnel, temporary slopes, open cut excavation, tunnel excavation, piles

  • The Potential of Biomarkers to Distinguish Lower and Middle Miocene Lignites from the Coal-Mining District of Lusatia

    I. Kojic, J. Kus, D. Zivotic, K. Stojanovic (2021)
    ... were determined. The biomarker compositions were evaluated using gas chromatography-mass spectrometry. TOC contents (48.17 – 57.20 %) associated with ash contents < 11.5 % indicate relatively stable water-level during peat formation and moderate supply of mineral matter. Total sulphur content ...

  • Regulacija nivoa tečne faze u vertikalnim separatorima

    Katarina Šoštarić (2024)
    Ovaj diplomski rad bavi se regulacijom nivoa tečne faze u vertikalnim separatorima u industriji nafte i gasa. U radu su istraženi različiti metodi merenja nivoa, uključujući plovke, ultrazvučne i radarske senzore. Radarski senzori su se pokazali kao najefikasniji u teškim radnim uslovima, zahvaljujući njihovoj visokoj preciznosti i pouzdanosti. Rad uključuje teoretski pregled metoda merenja nivoa, detaljno poređenje prednosti i nedostataka različitih senzora, kao i studiju slučaja implementacije radarskog senzora u vertikalnom separatoru. Analiza rezultata i preporuke za buduća istraživanja ...
    Merenje nivoa, Vertikalni separator, Radarski senzori, Ultrazvučni senzori, Industrija nafte i gasa
    ... nivoa, Vertikalni separator, Radarski senzori, Ultrazvučni senzori, Industrija nafte ıi gasa ABSTRACT This thesis deals with the regulation of the liquid phase level in vertical separators in the oil and gas industry. Different methods of level measurement were investigated in the paper, including ...
    ... Ultrasonic sensors, Oil and gas industry 1. UVOD Diplomski rad rađen na temu “Regulacija nivoa tečne faze u vertikalnim separatorima” sastoji se iz opšteg i specijalnog dela. Merenje nivoa tečnih faza predstavlja ključnu komponentu u industriji nafte i gasa. Precizno merenje nivoa je esencijalno ...
    ... gustina tečnog ili usitnjenog materijala p moguće je izračunati njegovu masu: m=V·p 2.5. Primene merenja nivoa u industriji nafte i gasa U industriji nafte i gasa, merenje nivoa je integralni deo procesa proizvodnje, transporta i skladištenja ı od presudnog je značaja za različite procese: l ...

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... of the pristine mineral occurring, without the clear formation of neophases. Trittschack et al. [18-20] observed the intensity decrease of the O-H stretching; mode at ~3600—3700 cm~-! over 450 *C (de-hydroxylation) and then the formation of forsterite at a temperature over ~500 "C, with the c ...
    ... oxidizing, atmosphere. The porosity of the body is high, as expected for terracotta fired at a low temperature, i.e., at a temperature inferior to the formation of a large amount of a liquid phase, which would typically be 1050 *C for CaO and MgO aluminosilicates [13]. Figures 3 and 4 show representative ...
    ... carbon doublet (1370–1600 cm-!) in many places, is consistent with a heating, process under reducing, conditions; reducing, conditions promote the formation of a liquid phase at lower temperatures in iron-rich pottery [13]. 3.6. Evidence of Residues: Gold Ore Processing Figure 9 shows a strong narrow ...

  • 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

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites

    Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković (2023)
    To investigate the effect of synthesis procedure and sintering temperature on the functional properties of perovskite/spinel ceramics, BaTiO3/CoFe2O4 composites were prepared by thermal decomposition, coprecipitation, and microemulsion method, and sintered at 1150°C and 1300°C. The phase composition and morphology of as-prepared powders as well as sintered ceramics were thoroughly examined by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). The dielectric and ferroelectric measurements were performed in detail. Generally, the ...
    Perovskite/spinel ceramics, Multiferroic, Sintering, Influence of synthesis method

  • Alpine thermal events in the central Serbo-Macedonian Massif (southeastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Andreas Wetzel, Irena Peytcheva, Albrecht von Quadt (2015)
    General Earth and Planetary Sciences

  • Structural characterization of traditional pottery produced from local clay, Rujište (Ražanj, Central Serbia), in an effort to preserve its geoheritage

    Maja Milošević, Biljana Đorđević, Alena Zdravković (2021)
    ... spheroidal and elongated tubules, which are the most common. EDS data confirmed hydroxides of illite and iron. Illite minerals deposited from formation waters in sandstones often appear in the form of slats and tiles, while iron hydroxides are mostly present in the form of solid spheres sometimes ...

  • Процена емисије гасова са ефектом стаклене баште као последице енергетске активности

    Горана Остојић (2024)
    Рад се бави анализом и проценом емисија гасова са ефектом стаклене баште, са посебним акцентом на емисије које настају као последица енергетских активности. Ефекат стаклене баште представља природни процес који је неопходан за одржавање живота на Земљи, али антропогене активности, попут индустријске производње и сагоревања фосилних горива, значајно повећавају концентрацију ових гасова у атмосфери, што доводи до климатских промена. Рад истражује узроке, последице и могућности за смањење емисија гасова, као и развој стратегија за ублажавање негативних ефеката на животну ...
    емисија гасова, ефекат стаклене баште, енергетске активности, климатске промене, мобилно сагоревање, стационарно сагоревање
    ... Измењено: 2024-10-21 07:33:16 Процена емисије гасова са ефектом стаклене баште као последице енергетске активности Горана Остојић Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Процена емисије гасова са ефектом стаклене баште као последице енергетске ...
    ... Based on the analysis of greenhouse gas emissions from different energy sources, significant differences were observed in the amounts of carbon dioxide (CO-»), methane (CHa), and nitrogen oxides (N-»O) released. Keywords: climate change, greenhouse effect, gas emission, climate change, stationary ...
    ... 2006 IPCC Guidelines for National Greenhouse Gas Inventories. Available at: https:/WWW.ipcc- nggip.iges.or.jp/public/2006gl/. [26] World Resources Institute (WRI) and World Business Council for Sustainable Development (WBCSD). 7he Greenhouse Gas Protocol: A Corporate Accounting and Reporting ...

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik
    ... generally compressive to strike-slip or completely exten- sional tectonic style (Cvetković et al. 2016). This extension was linked to Miocene back-arc formation in the Panno nian basin (Horváth et al. 2006; Ustaszewski et al. 2010). The exten- sion induces gravitational instability of the Dinaride orogen ...
    ... of Petrology 33, 965–1005. https:// doi.org/10.1093/petrology/33.5.965 Horvath F., Bada G., Szafian P., Tari G., Adam A. & Cloetingh S. 2006: Formation and deformation of the Pannonian Basin: Constraints from observational data. In: Gee D.G. & Stephenson R.A. (Eds.): European Lithosphere Dynamics ...
    ... Research 19, 1–23. https://doi.org/10.1111/j.1751-908X.1995. tb00147.x Xiao X., Zhou T., White N., Zhang L., Fan Y., Wang F. & Chen X. 2018: The formation and trace elements of garnet in the skarn zone from the Xinqiao Cu-S-Fe-Au deposit, Tongling ore dis- trict, Anhui Province, Eastern China. Lithos ...

  • Is the Sava-Vardar zone a remnant of an Upper Cretaceous ocen? Pro et contra

    Vladica Cvetković, Dejan Prelević, Ana Mladenović (2024)
    Neotethys, ocean closure, subduction
    ... The numerical 2D modelling [7] was based on conservative finite differences with marker- in-cell method. It was so far able to reproduce the formation of two Jurassic ophiolite belts via a single intra-occanic subduction that terminated at the carliest Cretaceous. If this time marks the true ...

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... layers. The mica is predominantly of detrital origin, but a small part might be a weathering product of feldspars. During the processes of coal formation mica is unstable and could transform to chlo­ rite, limonite, and clay minerals. Chlorite (Cr­rich chlorite as well, Fig. 4d) was found in the I ...
    ... and facies changes. It can be used as an indicator for the partial re­ construction of the environment conditions during peatification and coal formation (VASSILEV & VASSILEVA, 1996, 1998). 5.1. Affinity of the elements and geochemical associations High inorganic affinity (rash=0.7–1.0; Table 8; ...
    ... muscovite; Fig. 4) as well as with illite/smectite and chlorite in all coal seams. This result confirms the clastic input in the pa­ laeomire during formation of all coal seams in the Upper Mio­ cene. Pyrite is the most abundant sulphide mineral in the Kovin lignite. A strong positive correlation between ...

  • Geotechnical zoning of the terrain along the first section of E-80 highway in Serbia – SEETO route 7

    Dragoslav Rakić, Zoran Berisavljević, Irena Basarić, Snežana Bogdanović, Jovana Janković (2019)
    Part of E-80 highway that passes through Serbia (from the city of Nis to the administrative border Merdare) is 77 km long. The highway is divided into two sections: the first from Nis to Plocnik (39.4 km long) and the second from Plocnik to the administrative border with Kosovo. The route is designed through a typical plain and hilly terrain in which different geological units are dominant: crystalline schists, neogene sediments of foothills and quaternary sediments in the valley ...
    ... clays and clayey sands, but with occasional local occurrences of muddy zones. These muddy zones indicate early stage of alluvial environment formation, and they are unfavourable from engineering geological aspect. Potential instabilities are only present in the zone of unregulated river banks ...
    ... account engineering geological and hydrological characteristics, morphology of the terrain and basic meteorological conditions. During the formation of engineering geological limitation map, zoning of the terrain was performed into: A-terrains with minimal limitations, B-terrains with minor ...

  • Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif

    Ljiljana Vasić, Laszlo Palcsu, Huang Fen (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry

  • Control of substructure construction of railways in the Republic of Serbia

    Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović (2022)
    Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...
    доњи строј, техничка регулатива, насип, збијеност, контрола
    ... protect the soil from frost. The necessary conditi smaller than 0.02 mm, which prevents capillary rise of water and the formation of ice lenses, which causes uplift during formation, and when melting, the track settles. The protective layer cannot be located in the area of groundwater impact. The transition ...

  • Tectono-lithostratigraphic model of the Northern Banat Miocene sediments (Pannonian Basin, Serbia)

    Dejan Radivojević, Ljupko Rundić (2017)
    ... Pannonian Basin during the Late Miocene and Early Pliocene. Global and Planetary Change, 103, 168–173. MATENCO, L.C., & RADIVOJEVIĆ, D. (2012): On the formation and evolution of the Pannonian Basin: Constraints derived from the structure of the junction area between the Carpathians and Dinarides. Tectonics ...
    ... 1237–1254. ŠOLEVIĆ, T., STOJANOVIĆ, K., BOJESEN‐KOEFOED, J., NYTOFT, H.P., JOVANČIĆEVIĆ, B. & VITOROVIĆ, D. (2008): Origin of oils in the Velebit oil‐gas ºeld, SE Pannonian Basin, Serbia – Source rocks characterization based on biological marker distributions, Organic Geochem., 39/1, 118–134. MODELING ...

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes