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Упит dcterms_subject_txt:Rock mass

264 items

  • 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)
    ... contents of moisture, ash, sulphur, and total organic carbon (TOC) 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 ...

  • Оцјена водопропусности понорске зоне Шуковићу (Цернићко поље) помоћу Лижоновог теста

    Петар Војновић, Саша Милановић, Љиљана Васић (2022)
    One of the specificities of reservoirs forming in highly karstified terrains is reflected in the wide range of unknowns, specifically during reservoir formation, filling and operation. Unfortunately, despite complex research, many reservoirs constructed in karst terrains have problems with water losses from the reservoir to other aquifers due to ponor and ponor zones which are a common in the karst of Eastern Herzegovina. One of such zones is Šuković ponor located in the southern part of the Cerničko polje ...
    карст, Шуковића понор, Церничко поље, водопропусност, Лижонов тест

  • A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)

    Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...
    Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenika

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... sign, are shown in Table 4. Based on analysis of the Table 3. The percentage composition by mass of minerals in the samples of the �y ash and slag. No. the amorphous material Q f M Ml An Cr He CaO Total mass (%) NT A – m 58 16 10 5 5 3 3 – – 100 NT A – j 66 17 9 3 2 2 – – – 99 NT B – m 50 17 12 6 4 ...
    ... – Kostolac Table 2. Results of chemical analyses of �y and slag taken from the power plants. No. LOI 1000 SiO2 Al2O3 Fe2O3 CaO MgO SO3 S Na2O K2O mass (%) NT A – m 6.43 51.64 21.87 5.54 1.05 3.01 0.85 0.33 0.57 1.05 NT A – j 7.2 51.43 22.01 6.03 1.16 2.83 0.54 0.21 0.43 1.16 NT B – m 2.58 55.38 ...
    ... plants 321 cium oxide (CaO) are only present in very small quantities. The main reason for the variability of the chemical composi- tion is the waste-rock presence of inorganic composition. Based on the chemical composition the module R is deter- mined, and is shown in Fig. 5. The R module is used for ...

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling

  • Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation

    Maja Franković, Nevenka Novaković, Vesna Matović (2015)
    The Dark Gate is the monument of culture, part of the cultural and historical complex of the Belgrade Fortress. It is constructed of limestone blocks that after 270 years of exposure to environmental conditions and different anthropogenic influences show wide ranges of decay forms. During 2007, detail registration of all built limestone microfacies and weathering forms was done using tools of monument mapping. A correlation scheme ‘‘intensity– damage category’’ was made according to the type, intensity, and distribution of ...
    Krečnjak, mapiranje, Indeks raspadanja, brzina raspadanja, progresija
    ... surface (%) <0 20-50 >50 – Degree-covering of surface Low Low High _ _ Mass of detaching stone material Medium · High _ Mass of detaching stone material High _ Thickness of the scales (mm) 10 Mass of detaching stone material Medium · High _ Number and dimensions of fissures ...
    ... <02 0.2-—05 · 0.5-1 1-5 >5 Relief Depth (cm) <02 0.2-—05 · 0.5-1 1-5 >5 Outburst 'Volume (cm*) <10 10-125 125-500 500-1,000 ·>1,000 Crust Mass of detaching stone material Low Medium High Discoloration Soiling Biological colonization Granular disintegration Flaking Contour scaling ...
    ... the Monu- ment: survey, classification, and registration of lithological types and weathering forms. Mapping models used in the study included rock type mapping and weathering form mapping. Determination of damage categories on built stone blocks made it possible to calculate damage indices ...

  • 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
    ... et al. (2008) Al-rich garnets, which are anisotropic and twinned, form by prolonged interaction of pore fluids with the host rock, leading to a system buffered by the rock composition. They are commonly LREE depleted and HREE enriched, displaying weak positive or negative Eu anomalies. On the contrary ...
    ... Further, Fe-rich garnets grow rapidly by advective metaso- matism, at higher water/rock ratios (W/R), from magmatic- derived fluids, while Al-rich garnets are formed by diffusive metasomatism, at low W/R ratio, from host rock buffered metasomatic fluids (Gaspar et al. 2008). Significant presence of W ...
    ... Memoirs 32, 191–206. Jackson S.E., Pearson N.J., Griffin W.L. & Belousova E.A. 2004: The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology. Chemical Geology 211, 47–69. https://doi.org/10.1016/j.chemgeo.2004. 06.017 Jamtveit B. & Hervig ...

  • Molecular and Isotope Composition of Biomarkers in Immature Oil Shale and its Liquid Pyrolysis Products (Open and Closed System)

    Gordana Gajica, Aleksandra Šajnovic, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević, Ksenija Stojanović (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from raw immature oil shale samples from the Lower Miocene Aleksinac Basin (Serbia) and liquid products (LPs) obtained by pyrolysis in open (OS) and closed systems (CS) are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in LPs is determined. The molecular composition of the LPs from the OS pyrolysis is very similar to those in initial bitumen, independently ...
    ... Carbolite, UK) and closed (CS, autoclave) systems at a temperature of 400 °C for 4 h. The biomarker signatures were evaluated using gas chromatography-mass spectrometry and carbon specific isotope analysis (δ13C) of individual n-alkanes in initial bitumen extracted from two immature oil shale samples ...

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • 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

  • 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

  • The ‘Umka’ landslide

    Uroš Đurić, Dragana Đurić, Miloš Marjanović, Biljana Abolmasov, Ivana Vasiljević (2024)
    We present an in-depth landslide map of the ‘Umka’ landslide near Belgrade, Serbia, at a scale of 1:5000. The map delineates elements at risk, primarily buildings and road infrastructure impacted by the landslide displacements of several cm per year, introduced during frequent reactivation stages. The Main map results from a survey of over 350 buildings and more than 7 km of state and local roads. The acquisition techniques included engineering geological field mapping, building survey, and visual interpretation of ...
    rizik od klizišta, elementi rizika, kartiranje pomoću drona, ispitivanje objekata, geotehnički monitoring

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • English for Geology Students. 2

    Lidija Beko (2023)
    Engleski jezik
    ... the intrusion of molten granite batholiths into surrounding rock, both through heat and by forcing very hot liquids with high mineral contents into the rock. The crystallisation that occurs with cooling results in cracks in the rock being filled with mineral veins or – when the veins are grouped ...
    ... POOPOVIV-K. -f. · -650 . . j OMLON,. Vocabularyg ... ..032 .J - % . . „ye . • « • < }SLayaji- • • -e 15150 2 Reading Comprehension........... a MASS WASTING AND TYPES „ ttt Vocabulary...........i t ttt Reading Comprehension........... . SLOPE STABILITY ... ttt ttt Mocabulary_ y. NN al . JMN ...
    ... use this opportunity to extend a big and heartfelt “thank you” to him. Wulfenite > 10 . Part3 NMetals and gemstones All three of the basic rock types – igneous, sed- imentary and metamorphic – can be host to mineral ore deposits: accumulations of minerals with a sufficiently high concentration ...

  • Novi pristup proučavanju tekstura minerala značajnih za istraživanje rudnih ležišta

    Aleksandar Pačevski (2022)
    ... Transmission Electron Microscopy (SEM and TEM) methods in combination with Electron Microprobe Analysis (EMPA), Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) and other similar methods give a researcher a very "powerful weapon". However, if such a weapon is only a slightly misdirected ...
    ... determination: trends and achievements Miloš Marjanović, Analiza odrona u stenskim kosinama: savremeni pristupi Miloš Marjanović, Rockfalls analysis in rock slopes: state-of-the-art approaches Aleksandar Pačevski, Novi pristup proučavanju tekstura minerala značajnih za istraživanje rudnih ležišta Aleksandar ...

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • The oil industry and climate changes

    Dejan Radivojević (2020)
    Uprkos tome što je problem klimatskih promena poznat dugi niz godina i dalje veliki broj ljudi poistovećuje pojam vremenskih prilika sa klimom ne uzimajući u obzir različitu dužinu njihovog trajanja. U medijima se vrlo često mogu naći katastrofična predviđanja vezana za zagrevanje naše planete usled neodgovornog ponašanja čoveka. Sa druge strane geolozi znaju da je tokom geološke prošlosti naše planete bilo mnogo toplijih intervala od današnjih kao i da ti intervali nisu neminovno rezultovali masovnim izumiranjem živog sveta već su ...
    vremenske prilike, klima, naftne kompanije, strategije, Srbija
    ... that during the geological history of our planet there were much warmer periods than today, and that these intervals did not inevitably result in the mass extinction of the living world, but in some cases even favored the maximum development of some species and the formation of new one. The oil companies ...

  • Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering

    Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić (2020)
    γ-spectrometry, brushite, chukhrovite, phosphogypsum, radionuclides, recrystallization
    ... mechanism for the recrystallization process. The mass balance of the recrystallization experiment for the PGI sample is as follows: the yield of purified gypsum (PG1P) was 90.50%, with 4.29% of insoluble residue (PGIR) and 5.21% of the original mass in the supernatant. Sample PGIP was also subjected ...
    ... Cayjo(POx);F+ + 10H>SOa + 20H,O — 10CaSOu · 2H,O + 6H5PO, + 2HF (6) Quartz is the predominant Si-bearing phase, originating from the parent phosphate rock, as well as being precipitated by acid digestion of natural silicates and aluminosilicates. A relatively sig- nificant amount of phosphorus in raw ...
    ... shifting of the HPO? + H,O > H,POx+OH- equilibrium in the neutral water solution to the left compared to the highly acidic conditions of phosphate rock digestion with H,SO,. (Ca(H.)POu), has 100 times greater solubility than the less acidic CaHPOu·2H»O form.) SEM analysis The SEM analysis revealed ...