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Упит dcterms_subject_txt:Phase transition

150 items

  • New data from the Lower Cretaceous carbonate platform deposits of Dimitrovgrad section (Southeastern Serbia)

    Jelena Stefanović, Bojana Džinić, Giovanna Della Porta, Dejan Radivojević (2021)
    Lower Cretaceous, facies analyses, limestones, Getic, Serbia, carbonate platform
    ... of deposition from platform interior to reef depositional environment. Besides that, the pyrite rich siliciclastics provide the information of transition to slope environment. The distribution of different facies show rapid lateral and vertical changes of depositional environments varying from platform ...

  • Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević (2019)
    Изингов модел, критично понашање, танки системи

  • 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
    ... observations in the screening phase, three samples were selected for the stability study: S 10%, S+M 1 + 1 10%, and S+M 3 + 2 10%. 3.1.2. Determination of the glass transition temperature of the maximally freeze-concentrated solution (Tg') The glass transition temperature of the maximally freeze- ...
    ... (Holzer et al., 2009). During freezing, as the temperature is lowered, phase separation occurs with the formation of two regions within the sample - ice crystals and cryo-concentrated (or nano-concentrated) phase. In the latter phase, the distance between nanoparticles decreases, increasing the probability ...
    ... the glass transition temperature of the maximally freeze-concentrated solution (Tg'), liquid samples were cooled from 25 "C to -80 "C at a rate of -0.5 "C/min and then heated to 50 "C at a rate of 10 "C/min. The value of Tg' was characterized as the midpoint of the glass transition. This analysis ...

  • Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković (2021)
    The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...
    In Pit Crushing and Conveying, IPCC, open pit mining, haulage, optimization, costs saving

  • Navigacija budućnosti: poslovni rizici i prilike u rudarskoj industriji

    Petar Marković, Dejan Stevanović, Mirjana Banković, Vuk Lazić (2024)
    Sektor rudarstva i metalurgije se globalno suočava sa brzo evoluirajućim okruženjem u 2024. godini, koje karakteriše jedinstvena međusobna zavisnost rizika i prilika. Sektor je u središtu globalne energetske tranzicije, uz rastuću potražnju za kritičnim mineralnim sirovinama poput litijuma, nikla i bakra, koji su od suštinskog značaja za tehnologije obnovljive energije i električna vozila. Međutim, ova sve veća odgovornost donosi brojne izazove, uključujući pojačanu pažnju na ekološke, društvene i upravljačke (ESG) faktore, fizičke i tranzicione rizike uzrokovane klimatskim promenama, i ...

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... Sedimentary characteristics of unit D. (a) The transition from unit C into unit D. The change is noticeable in the onset of fining-upward sequences (unit D) compared to sandstone/siltstone repetition (unit C). A gradual change of colour also marks the transition. (b) Internal organization of bed D7. The ...
    ... sharp, erosional lower surface of the bed passing into either a structureless interval or an interval with wavy lamination and then a gradual transition into siltstone (i.e. layer A3). Alternatively, layer A4 comprises of fining upward sandstone with parallel lamination which passes into a level ...
    ... Internal sedimentary structures are partially exposed in sand- stones and are represented by parallel lamination and wavy lami- nation with a subtle transition between them. Convolute lamina- tion intervals occur within the unit at several levels (i.e. bed C7). Structureless sandstone beds (up to 5 cm ...

  • Projecting short to medium-term effects of carbon emissions trading on Serbia's GDP

    Boban Pavlović, Nikola Trtica (2024)
    This paper presents an approach to assess the short to medium-term effects of the Emissions Trading System (ETS), an economic and climate policy instrument aimed at reducing greenhouse gas emissions, on GDP from the expenditure side. The analysis focuses on Serbia’s electricity sector, which relies heavily on lignite-based pro duction dominated by state-owned enterprises. The obtained projections suggest that in the short term, the introduction of an ETS may lead to slower GDP growth compared to official forecasts. However, ...
    ETS, BDP - rashodni pristup, cene električne energije
    ... Pereira Freitas, C.J., Pereira da Silva, P., 2015. European Union emissions trading scheme impact on the Spanish electricity price during phase II and phase III implementation. Util. Pol. 33, 54–62. https://doi.org/10.1016/}.jup.2015.01.004. Regional Cooperation Council, 2021. Action Plan for the ...
    ... scientific and professional studies focus on the effects of an ETS on reducing emissions (Haites et al., 2018; European Commission, 2021) and on the transition from fossil fuels to renewables, including invest- ment patterns (Hoffmann, 2007; Huang et al., 2023) and technological innovation (Teixido et ...
    ... provide insight into the consequences of specific policy interventions, contributing to more informed economic planning in the context of energy transition strategies and GHG emissions reduction targets. The proposed approach will be applied in the case of Serbia, which has committed to decarbonization ...

  • Failure Estimation of the Majdanpek Open Pit East Face Based on Inverse Velocity Model

    Miloš Marjanović, Stefan Milanović, Nikola Simić, Lazar Kričak (2024)
    The Majdanpek open pit mine south district is currently active mining prospect of copper ore exploitation in eastern Serbia. Its depth is approaching the termination depth and occurrences of large-scale instabilities and global instability of the final pit slope is possible. These can generate catastrophic mass movement inside an area that encloses a regional road route and the Pek River bed which is channelled along the outer contour of the pit. The displacements that were noted in early 2023, in the ...
    displacement, survey, inverse velocity, open pit

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... principle crystalline phase. The most important structural change due to phase transition, the disappearance of the characteristic out-of-center distortion of the Ti atom and moving to the center of octahedra, was also confirmed via Rietveld refinement. Phase transition from P21/a to A2/a space ...
    ... Am Mineral 84: 282-287. Angel R.J., Kunz M, Miletich R., Woodland A.B., Koch M. and Xirouchakis D. (1999b) High pressure phase transition in CaTiOSiO4 titanite. Phase Trans 68: 533-543. Angel R.J., Ross N.L., Seifert F. and Fliervoet T.F. (1996) Structural characterization of pentacoordinate ...
    ... Matter 25: 315402. Ghose S., Ito Y. and Hatch D.M. (1991) Paraelectric-Antiferroelectric Phase Transition in Titanite, CaTiSiO5: I. A high temperature X-ray diffraction study of the order parameter and transition mechanism. Phys Chem Miner 17: 591-603. Dana E.S. (1959) Manual of mineralogy. John ...

  • Savremene tendencije upravljanja mineralnim resursima u svetu i stanje u Republici Srbiji

    Dragan Ignjatović, Vladimir Pavlović (2024)
    Strategija upravljanja mineralnim i drugim geološkim resursima na održivim i holističkim osnovama, služi kao osnova za vladinu politiku vezanu za geološka istraživanja i eksploataciju mineralnih resursa u skladu sa njenim pravnim i regulativnim obavezama. Uspostavljanje Strategije obezbeđuje osnovu za dalji razvoj i ona se realizuje u relevantnim oblastima politike kako bi se postigli postavljeni ciljevi, pri čemu se resursi moraju dobijati i koristiti na održiv način. Strategija treba transparentno da istakne mogućnosti i izazove, stvori preduslove, razjasni uloge i ...
    strategija upravljanja, mineralni resursi, rezerve, rudarstvo, geologija.
    ... thium-supply-chain/30827/ [4] Geopolitics of the Energy Transition: Critical Materials. (2023). International Renewable Energy Agency (IRENA). Dostupno na: https://www.irena.org/Publications/2023/Jul/Geopolitics-of-the-Energy- Transition-Critical-Materials [5] Draft United Nation Resource Management ...

  • Integrative GHG Assessment in Oil and Gas Industry

    Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa (2023)
    Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...
    energetska tranzicija, gasovi staklene baste, industrija, nafta i gas
    ... emission. It was shown that the major sourcc of emission is gas flaring, while the kecy contributor is uncombusted methane. Index Terms - Energy transition, Greenhouse gas cemissions, Industry, Oil&Gas. Rezime – Smanjenje emisije gasova staklene bašte jedan je od glavnih ciljeva nacionalnih strategija ...

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... global temperature rise below 2 degrees Celsius requires a profound transition of the global energy system from a system based largely on fossil fuels to one that increases the efficiency and share of renewables (IRE, 2018). A transition to- wards long-term sustainability in global energy systems based ...
    ... national energy transition may promise multiple benefits, such as economic growth, job creation, mitigation of climate changes, and the reduction of air pollu- tion (ILO, 2018). However, the optimal renewable energy struc- ture of future national electricity system and potential transition pathways are ...
    ... such as greenhouse gas emissions, pollution, and the exceeding of critical planetary boundaries (Bogdanov et al., 2019). The on-going global energy transition from the fossil-based to the low-carbon energy sector has increasingly been incorporated in national energy strategies. At the core of these documents ...

  • Енергетска безбедност Европске уније у светлу актуелне енергетске транзиције

    Бобан Павловић, Дејан Ивезић (2021)
    Енергетска стратегија Европске уније, која од 2015. године обухвата и циљеве у области климатских промена, тежи изградњи „енергетске уније” која потрошачима из ЕУ даје сигурну, приступачну, чисту и одрживу енергију. Енергетска политика ЕУ поставља пред себе амбициозне циљеве у погледу коришћења обновљивих извора – учешће од 32% до 2030. године. Овако опсежну и динамичну енергетску транзицију у Европи усложњава хетерогеност националних енергетских система у погледу структуре енергетског микса, нивоа увозне зависности, као и нивоа технолошког, друштвеног и економског ...
    енергетска безбедност, Европска унија, енергетски показатељи, природни гас, обновљиви извори енергије
    ... H., Hake, J.-F., Allelein, H.-J., “Natural gas as a bridge to sustainability: Infrastructure expansion regarding energy security and system transition”, Applied Energy, 251, 2019, 113377. 3. EC, European Commission, Energy security, ЕС, 2020, https://ec.europa.eu/energy/topics/energy-security_en ...
    ... Енергетска безбедност, Едуконс Универзитет, Сремска Каменица, 2019. 5. Mata Perez, M. E., Scholten, D., Stegen, K. S., “The multi-speed energy transition in Europe: Opportunities and challenges for EU energy security”, Energy Strategy Reviews, 26, 2019, 100415. 50 6. Hedberg, A., Europe’s ...

  • 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

  • Polymorphism and photoluminescence properties of K3ErSi2O7

    Predrag Dabić, Marko G. Nikolić, Sabina Kovač, Aleksandar Kremenović (2019)
    alkalni silikati elemenata retkih zemalja, silikati lantanoida, polimorfizam, fotoluminescencija, kristalna struktura

  • Production of electricity from coal-fired power plants and accompanying CO2 emissions: comparison of EU-27 and US

    Uroš Djorgovski, Aleksandar Madžarević, Predrag Jovančić (2023)
    Even in the third decade of the 21st century, large power plants are still responsible for more than half of the electricity production in Europe and US. They predominantly use fossil fuels in their work, which results in the emission of pollutants into the air, soil and water. In addition to the production of electric energy, fossil fuels, including coal, are used for industrial purposes. Although the use of coal, especially in the countries of the European Union, is ...
    CO2, емисија, угаљ, термоелектрана, САД, ЕУ-27
    ... 21st century has grown as much as 30 times since the industrial revolution, because of rapid technological progress and exceptional demographic transition [1]. Looking at long-term changes and projections of the possible development of various energy sectors is a vital activity for the sustainable ...
    ... sheet data, it is noticeable that renewable energy sources take precedence. While coal remains a primary fuel in the European energy mix, the transition to cleaner forms of energy and innovative technologies, such as carbon capture and storage, is imperative to meet the EU's commitment to reduce ...

  • Integrated Stratigraphy of the Middle–Upper Jurassic of the Krížna Nappe, Tatra Mountains

    Renata Jach, Nevenka Đerić, Špela Goričan, Daniela Reháková (2014)
    carbon and oxygen isotopes, radiolarians, calcareous dinoflagellates, radiolarites, Krížna Nappe, West ern Carpathians, Tethys
    ... displaying, a transition from littoral through hemipelagic to pelagic deep-sea sedimentation. The Jurassic deposits of the Križna Nappe in the Tatra Mountains represent deep-water successions of the Zlic- chov type (Mahe! and Buday, 1968; Michalik, 2007). The Early Jurassic phase of extension ...
    ... radiolarian production. A significant increase in CaCOy content is recorded just above the Late Callovian 6&5C excursion, which coincides with a transition from green to variegated radiolarites. Key words: carbon and oxygen isotopes, radiolarians, calcareous dinoflagellates, radiolarites, Križna ...
    ... omission surface (Gradzinski ef al., 2004; Jach, 2007) at the top of the Toarcian-?Aalenian red nodular limestones (Kliny Limestones Member). The transition to the overlying spotted radiolarites is marked by a decrease in CaCOxy content (Figs 3, 4). The lowermost part of the Bosifra-crinoidal limestones ...

  • Fluid inclusion systematics in the Okoška gora polymetallic deposit

    Aleš Šoster, Miloš Velojić, Barbara Potočnik Krajnc, Matej Dolenec (2021)
    ... their assemblages are generally oriented in linear formš, sgardless ofthe crystal shape. Inclusions in both assemblages are generally two-phase, rarely iree-phase, the latter containing unknown transparent solids, which are probably not salt rystals. Two types of inclusion assemblages have been identified ...
    ... inclusions suggest the presence of two mineralizing fluids in the system, raising questions about their origin and metallogenetic fertility. The transition from a higher-temperature to a lower-temperaturč fluid in the system could indicate tWO mineralizing pulses or mixing and dilution of the primary ...
    ... minerals. Assemblages S2 and Q2 are characterised by lTuid inclusions consisting mainly of negative crystal shaped inclusions, which have larger apour-phase bubbles compared to assemblages 51 апа О1. These features indicate precipitation under higher temperature conditions. In addition, the S2 and Q2 inclusions ...

  • An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)

    N. Andrić-Tomašević, V. Simić, O. Mandic, D. Životić, M. Suárez, E. García-Romero (2020)
    Paleontology,Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics,Oceanography

  • Solid state synthesis of extra phase-pure Li4Ti5O12 spinel

    Ivana Veljković, Dejan Poleti, Ljiljana Karanović, Miodrag Zdujić, Goran Branković (2011)
    Фазно чист спинел Li4Ti5O12 са величином честица мањом од 500 nm добијен је реакцијом у чврстом стању из стехиометријске смеше наноанатаса (ТiО2) и Li2CO3 која је претходно активирана механохемијским поступком. Реакција у чврстом стању у потпуности се завршава за само 4 часа на температури од 800 ºC. Уз помоћ XRPD, SEM и TG/DSC анализе испитане су структурне и микроструктурне карактеристике добијеног спинела, механизам реакције између анатаса и Li2CO3, као и термичка стабилност Li4Ti5O12. Реакција започиње разлагањем Li2CO3 на температурама ...
    дифракција рендгенских зрака, механизам реакције, термичка стабилност, Li4Ti5O12, спинел, фазно чист узорак