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1491 items

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... Tesla A (PPNT A) in Obrenovac. This paper presents the pozzolanic, mechanical, chemical and mineral composition and properties of fly ash obtained in the combustion process in a PPNT A with the addition of a binder hydrated lime and cement. Tests were performed after 7 and 28 days in a humid ...
    ... mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a binder hydrated lime and cement. The aim of research is to test the possibility of using the fly ash from PPNT A for making elements of road structures (top and bottom layers of ...
    ... without the addition of binders, - a sample with the addition of 2 % of binder, - a sample with the addition of 4 % of binder, - the sample with the addition of a binder 6 % (hydrated lime and cement). The mineral composition of fly ash and slag from PPNT A is determined from the diagram of ...

  • Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study

    Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2023)
    Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms ...
    Pharmaceutical Science
    ... (XRPD). The analysis was performed on a Rigaku Smartlab X-ray diffractometer in a 0-0 geometry using the D/teX Ultra 250 strip detector in 1D standard mode with a CuKou „ radiation source (U=40 kV and I=30 mA). Data were acquired in a 20 range of 3-40% using a low background single crystal silicon ...
    ... of the lyophilzates was analyzed by scanning elec- tron microscopy (SEM). A small amount of the sample was placed on a conductive double-sided adhesive tape and examined with a Zeiss Ultra Plus 55 or Zeiss DSM 940 A microscope (Carl Zeiss GmbH, Oberkochen, Germany). Photomicrographs were taken ...
    ... Yurquina, A., Locatelli, S., Brandšn, S.A., 2012. A complete characterization of the vibrational spectra of sucrose. Carbohydr. Res. 361, 212–218. https://doi.org/10.1016/j.carres.2012.07.009. Bruni, G., Berbenni, V., Milanese, C., Girella, A., Cofrancesco, P., Bellazzi, G., Marini, A., 2009. P ...

  • Анализа квантитативног и квалитативног режима подземних вода: Случај изворишта за водоснабдевање Друговца у Смедереву

    Милан Павличић (2024)
    У раду су приказани резултати истражних радова који су спроведени у периоду од 13.04.2018. до 31.05.2019, у циљу дефинисање режима и категоризације резерви подземних вода на изворишту за водоснабдевање Друговца у Смедереву. Бунарима ИЕБДР-1/93 и ИЕБД-1/2002 су каптирани песковити седименати неогене старости. У току режимских осматрања вршени су тестови црпења, осматрања нивоа подземних вода, режимa падавина као и квалитетa подземних вода. Утврђене су укупне резерве подземних вода у количини од 5,3 l/s. Хемијске анализе воде показују да је хидрохемијски ...
    режимска осматрања, тестови црпења, неогени седименти, хидрохемијски режим, извориште
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    ... n | asa | a | 34 0,8 11,2 2000 | -5 | 3,5 6,0 14,5 | a8,7 | 22,5 | 2%,6 | 2, | a | a3g | 4 2,8 12,7 2001 1,8 3,6 8,8 10, | ai8,2 | a8,0 | 22,5 | 200 | as | a }| aa | a | ua 2002 | -o | 54 8,1 11,6 | 20,8 | 22,8 | 23,9 | 22,0 | aca | 15 sa | -0, 12,5 2003 | -3, | -a | đ5,0 10,8 | 20, | 244 | 23 ...

  • GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities

    Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević (2021)
    GNSS, Time series, Seismic deformations, Earthquake, Infrastructure utilities

  • Ventex: an expert system for mine ventilation systems analysis

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    roblems relating to mine ventilation systems analysis are usually of a very complex nature. They involve the estimation of numerous interdependent parameters pertaining to the network status, ventilation status, ventilation system stability, air current losses, climate conditions, gas state, fire risk and dangerous dust pollution risk. The solution to these problems relies, to a great extent, on numerical methods. With the development of computer technology these methods were incorporated as numerical routes in software packages, such as the mine ...
    expert system, mine ventilation

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... unrelated programs when sending or receiving pre-generated map imagery to users who have issued a request. Simply put, the WMS is a service by which the client can send a request to view a map from a server. This cartographic web service produces maps of georeferenced data by drawing them in the ...
    ... takes place in a similar way: the first page features a tabular representation of the data set with the possibility of search, that is, filtering according to given criteria. The level of access to data and the possibilities for editing depend on privileges that are assigned to a particular user ...
    ... Vojvodina is publicly available. A simple search panel enables retrieval of abandoned mines, and a systematized database is available that for the first time brought together all the available data on abandoned mines in the territory of Vojvodina, and as such can serve as a model for similar bases on ...

  • Pregled geologije i istraživanja urana u oblastima Naarst-a, Suujiin Taal-a i Zunbajan-a u jugoistočnoj Mongoliji (Dornogovi)

    Vakanjac Boris, Ristić-Vakanjac Vesna, Kondžulović Rajko (2014)

  • Effects of Energy Production and Consumption on Air Pollution in Serbia

    Marija Živković (2019)
    Energy production and combustion, mostly from unregulated or inefficient fuel combustion, are the single most important anthropogenic sources of air pollutant emissions. Energy sector in Serbia is highly fossil fuel intensive: 87.88% of energy consumed in Serbia is related to fossil fuels, while almost 95% of energy sources are combusted. In 2017. energy related carbon dioxide emission in Serbia is was 47.95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy ...
    energy related emissions, Serbia
    ... contents < BS Export PDF < ® ®uBg Comment a fl Executive Summary SO, NOx PM, 5 Bl combine Files N °o Organize Pages ~ QQ Part A: Global energy and air pollution trends > A Chapter 1: Energy and air pollution > A Chapter 2: Outlook for air pollution Se > A Chapter 3: Energy action for cleaner air ...
    ... Country profiles 8 > A Chapter 4: United States 4 > A Chapter 5: Mexico Redact vo 2 = B16 ssn 4 Qa z& Q, Fill & Sign [BS send for Review More Tools > A Chapter 6: European a Union Biomass T r 1 cr r T r 7 io r T sa 7 > LJ Gaaaae 0% 50% 100% 0% 50% 100% 0% 50% 100% > A Chapter 8: India > [I ...
    ... emission factors are represented; fuels not shown are considered a negligible. Global average emission factors are calculated across all types of sectoral activity and all types of technology. > A Chapter 10: Africa vf Annexes A Annex A: Definitions . . . . . . . . . oe This section examines the role ...

  • Tectonic evolution of the Circum-Moesian orocline of the Carpatho-Balkanides: Paleomagnetic constraints

    Emő Márton, Vesna Cvetkov, Miodrag Banješević, Gábor Imre, Aleksandar Pačevski (2024)
    Apuseni-Banat-Timok-Srednogorie belt, danubicum, paleomagnetism, oroclinal bending

  • 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

  • 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

  • Debris-flow Susceptibility Assessment in Flow-R: Ribnica River Case Study

    Ksenija Micić, Miloš Marjanović, Biljana Abolmasov (2024)
    Debris flows are among the most dangerous erosional geohazards due to the fast rate of movement and long runout zones. Even though the initiation can be triggered in mountainous areas, inhabited and with steep slopes, their propagation and deposition can endanger not only buildings and infrastructure in the urbanized areas, but also threaten human lives. As these initiation areas usually represent unattainable terrains with rapid vegetation cover development, field observations and aerial photo analysis become high-demanding tasks. Consequently, medium-to-regional ...
    tečenje drobine, Flow-R, procena podložnosti, empirijski model

  • Geotehnički uslovi izgradnje tunela „Debelo brdo“ na autoputu E-80 Niš - Pločnik

    Dragoslav Rakić, Radojica Lapčević, Irena Basarić Ikodinović, Dragan Lukić (2022)
    Tunel „Debelo brdo“ nazvan je po najizraženijem relјefnom obliku na ovoj drugoj deonici autoputa E-80 Niš – Pločnik. Osnovnu geološku građu na lokaciji tunela čini Mio-Plioceni kompleks heterogenog litološkog sastava. Izgradnja tunela je predviđena delom u otvorenom iskopu dužine 240 m, a delom sa podzemnim iskopom dužine 190 m. U zoni tunela, padina je okarakterisana kao uslovno stabilna, pa bi neadekvatna zasecanja mogla da izazovu klizanja terena. Iz tih razloga, u okviru rada posebno su prikazani geotehnički uslovi izgradnje ...
    Tunel „Debelo brdo“, Geotehnički parametri, Privremene kosine, Šipovi, Podgrada.
    ... AUTOPUTU E- - 1, 2 3 4 1 Univerzitet u Beogradu Rudarsko- a 7, Beograd, dragoslav.rakic@rgf.bg.ac.rs 2 Univerzitet u Beogradu Rudarsko- a 7, Beograd, radojica.lapcevic@rgf.bg.ac.rs 3 Univerzitet u Beogradu Rudarsko-g a 7, Beograd, irena.basaric@rgf.bg.ac.rs 4 Univerzitet u Novom Sadu ...
    ... kojima se lako cepa i odvaja (Slika 3b), lokalno je masivan. -cm dimenzija. (Slika 3c), dok su u drugim a povremeno se retko javljaju i sitni , a konstatovan je na a) b) c) Slika 3. Makroskopski izgled laporovitih glina,glinovitih lapora i proslojka peska U dve e ...
    ... Dragoslav Radojica , Irena 40 a) b) Slika 5. dardne jednoaksijalne opite iz rezultata jednoaksijalnih opita, korelacionih zavisnosti sa rezultatima SPT opita. Nedrenirana a smicanja su za laporovite gline (gl-prL se u intervalu od Su = 121 237 kPa, a za lapore glinovite (Lgl,pr) Su ...

  • Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)

    Saša Ivanišević, Dejan Radivojević (2018)
    Exploration for oil and gas in mature areas, such as the Pannonian Basin, can benefit from reexamination of old data using more advanced modern workflows that focus on the temporal and spatial aspects of sediment deposition. Specifically, we apply a new environment of deposition model that interprets the Upper Miocene- Pliocene sediments as being deposited in a rapidly filling basin characterized by quick shelf edge progradation from the northwest toward the southeast. Reconstruction of this shelf edge trajectory reveals ...
    naftna geologija, depozicione sredine, formacije, Panonski basen

  • Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina

    Tina Dašić, Ljiljana Vasić (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry,Global and Planetary Change

  • Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

    Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)
    The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...
    otpadne vode, toplotna pumpa, daljinsko grejanje, simulacija

  • Fragmentation Size Prediction of Blasted Material Using a Specialized Software for Drilling and Blasting

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić, Miljan Gomilanović (2024)
    Design and optimizing the drilling and blasting parameters, should fill the requirements for the capacity, fragmentation size, and technical characteristics of loading and transport equipment, and enable a safe work at the open pit. Besides mentioned, it also achieves the minimal impact on the environment of the open pit and decreases the negative effects on the environment, especially in the blast vibration and flyrock. To obtain the best possible blasting effects and consider all the factors, a specialized software is ...
    optimization, O-Pitblast, drilling, blasting, fragmentation size

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • 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
    ... natural radioactive series for a period of 4 weeks. The activity concentra- tion of radionuclides was determined using a high-purity germa- nium radiation detector of 50% relative efficiency. The detector was calibrated using a secondary reference material with a char- coal matrix in the same 120 ...
    ... Accepted Manuscript online: 28 April 2020; Associate Editor: Asuman Turkmenoglu) Phosphogypsum is a waste product of the phosphoric acid manu- facturing process. It is produced in the form of a fine powder with a large calcium sulfate content. This process produces ~5 tons of phosphogypsum for every ton ...
    ... higher activity concentration of 2%U, was further subjected to the recrystallization process (Fig. 2). A total of 10 g of the sample was mixed with 2 L of distilled water in a beaker. Using a magnetic stirrer, the mixture was stirred for 2 h at ~45%C, allowed to settle for 2 h at the same tempera- ...

  • Lower Berriasian ammonites from Dedina (Golubac Mountains, eastern Serbia) and their biostratigraphic implication

    Zdenek Vasícek , Dragoman Rabrenović, Petr Skupien, Barbara Radulović (2023)
    Ammonites, Taxonomy, Lower Berriasian, Getic, Northern Tethys, Serbia
    ... |_f|4 Hi LI | |}- -} -_-L}] E B I J EsH|I ||BLJ-| a -B EaE E s |M | LJ |E | J E || || || A / | | j ||> |M | || }A | | || -i I L J Lj - I - - -| | - { | LJ ||_|| |A|}_| |_{L_| |f= | L J i |Epi|s | s | | 5 / % Bie|||s|P|P{E|S| ...
    ... (specimen SA13.2/12). It has a heavily corroded, flatly deformed first quarter of the last whorl and part of the third quarter of the last whorl, with a more favourable preservation of a less corroded outer mould. The unfavourably pre- served opposite side shows a small segment of development ...
    ... transitions rather abruptly into a narrow ventral side. The whorl at the base falls off with a not-very high, but clearly defined, oblique umbilical wall. The body chamber is separated from the phrag- mocone by a distinct constriction. The juvenile sculpture changes at a diameter of approximately 22 ...