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334 items

  • Дефинисање хидрауличког механизма истицања карстних подземних вода применом биваријантне анализе временских серија

    Вељко Мариновић (2022)
    Bivariate analysis was applied within the cross-correlation in time and the gain function as part of the cross-spectral function in the frequency domain, to the time series of precipitation and discharge of the Oko Bijela and Bosna karst springs in the period 2015-2020. Bivariate analysis showed a very fast reaction of the Oko Bijela spring and a reaction delay at the Bosna spring, which indicate a very weak amortization of the input signal within the Oko Bijela system and ...
    карст, подземне воде, механизам истицања, крос-корелација, спектрална анализа

  • Резултати иницијалних хидрогеолошких истраживања карстног врела Бијели Нерини (централна Црна Гора)

    Голуб Ћулафић, Вељко Мариновић, Јелена Крстајић, Бранислав Петровић (2022)
    Врeлo ’’Биjeли Нeрини’’ (305 мнв) нaлaзи нa сjeвeрoзaпaдним oбрoнцимa планине Мaгaник, изнaд кoритa риjeкe Мртвицe (на њеној десној обали). Извoриштe je рaзбиjeнoг типa, кoje je зaтрпaнo крупним блoкoвимa крeчњaкa и дoлoмитa. Извoриштe je вeoмa издaшнo, сa прeтпoстaвкoм дa у минимуму имa приближно 500 л/с, дoк му мaксимум прeлaзи и прeкo 2000 л/с, aли збoг кoнфигурaциje тeрeнa je зa сaдa билo вeoмa тeшкo пoтврдити тe вeличинe. Прeдстaвљa сeгмeнт који упoтпуњуje цjeлoкупну слику геолошких и физичкo-гeoгрaфских спeцифичнoсти кaњoнa риjeкe Мртвицe, десне ...
    Бијели Нерини, карстно врело, Мртвица

  • Transformer-Based Composite Language Models for Text Evaluation and Classification

    Mihailo Škorić, Miloš Utvić, Ranka Stanković (2023)
    Parallel natural language processing systems were previously successfully tested on the tasks of part-of-speech tagging and authorship attribution through mini-language modeling, for which they achieved significantly better results than independent methods in the cases of seven European languages. The aim of this paper is to present the advantages of using composite language models in the processing and evaluation of texts written in arbitrary highly inflective and morphology-rich natural language, particularly Serbian. A perplexity-based dataset, the main asset for the ...
    General Mathematics, Engineering (miscellaneous), Computer Science (miscellaneous)

  • The interaction of organoselenium trans-palladium(II) complexes toward small-biomolecules and CT-DNA

    Vera M. Divac, Aleksandar Mijatović, Marina D. Kostić, Jovana Bogojeski (2017)
    Serija organoselenijum trans-paladijum(II) kompleksa 1 (bis(2-(fenilselanilmetil)oksolan)dihloropaladijum(II)), 2 (bis(2-(fenilselanilmetil)oksan)dihloropaladijum(II)) i 3 (bis(2) ,2-dimetil-3-(fenilselanil)oksan)dihloropaladijum(II)) su korišćeni za ispitivanje reaktivnosti ovog specifičnog tipa kompleksa prema različitim bio-molekulima. Ovaj sistem je od posebnog interesa jer se jako malo zna o supstitucionim reakcijam organoselenijum paladijum(II) kompleksa sa trans konfiguracijom. Zamena koordinovanog hlorida sa serijom malih bio-molekula (l-Met, l-His, l-Cis, GSH i 5′-GMP) proučavana je pod uslovima pseudo-prvog reda kao funkcija koncentracije nukleofila i temperature korišćenjem tehnika zaustavljenog toka. Rezultati za proučavane komplekse ukazuju da ...
    Pd(II), Selen, Substitucija, Kinetika, Mehanizam

  • Simpson's rule application for experimental determining parameters of rock mass oscillation equation at limestone

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Branko Gluščević, Luka Crnogorac (2021)
    By its form, the use of explosives has a destructive character. However, energy of chemical explosives is tamed and perfected in many effects, so that is developed a series of activities which work is unthinkable without the use of explosives. In mining industry, explosives are most commonly used for exploitation in hard rock mass. Thereby, large amounts of explosives can be used, especially for mass blasting. The application of large amounts of explosives gives auspicious techno – economic indicators ...
    working environment, seismic effects of blasting, oscillation velocity, rock mass oscillation equation, Simpson’s rule

  • Prilog poznavanju režima voda reke Visočice

    Vesna Ristić Vakanjac, Jovan Nikolić, Marina Čokorilo Ilić, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin, Jelena Ratković (2018)
    Специфични геолошки и хидрогеолошки услови у области слива реке Височице, а пре свега широко распрострањење карбонатног средње тријаског комплекса стена, као и доњо тријаске шарене серије (алевролити, пешчари, конгломерати) имали су за последицу формирање специфичног типа дренажне мреже као и специфичног режима отицаја реке Височице и њених значајнијих притока. У конкретном случају, у горњим деловима слива ове реке као и њених главних притока, у оквиру доњо тријаских седимената развијен је дендритичан тип хидрографске мреже, док преласком на средње тријаске ...
    režim, specifični oticaj, Visočica

  • Filling of dolines with aeolian sediments in the high-mountain karst of the Dinarides (Mt. Durmitor, Montenegro)

    Mirela Djurović, Violeta Gajić, Predrag Djurović (2022)
    Filling of dolines with aeolian sediments, one of the less frequently described ways in which they are filled, is analysed in the present study on an example of a doline in the high-mountain karst of the Dinarides. There is a series of deep dolines on a broad ridge (about 2450 m a.s.l.) on Mt. Durmitor (Montenegro) in the southeastern part of the Dinarides. The accumulation of very fine-grained sand that almost completely fills one of the dolines was analysed. ...
    Doline, Zapuna, Eolski sedimenti, Karst, Dinaridi, Crna Gora

  • In vitro and in silico study of the biological activity of tetradentate Schiff base copper(II) complexes with ethylenediamine-bridge

    Aleksandar Mijatović, Nevenka Gligorijević, Dušan Ćoćić, Snežana Spasić, Aleksandar Lolić, Sandra Aranđelović, Milan Nikolić, Rada Baošić (2023)
    The biological activity of six structurally similar tetradentate Schiff base copper(II) complexes, namely [Cu(ethylenediamine-bis-acetylacetonate)] (CuAA) and five derivatives where two methyl groups are replaced by phenyl, (CuPP), CF3 (CuTT) or by mixed groups CH3/CF3 (CuAT), Ph/CF3 (CuPT), and Ph/CH3 (CuAP) has been investigated. The set of antioxidant assays was performed, and the results were expressed as IC50 and EC50 values. The series of complexes showed interesting bioactivity and were investigated for the determination of antioxidant, antifungal, antimicrobial, and cytotoxic ...
    Inorganic Chemistry, Biochemistry

  • Structure, interaction with biomolecules, and cytotoxicity of copper (II) complexes chelating some Schiff base ligands

    Aleksandar Mijatović, Angelina Z. Caković, Aleksandar Lolić, Olivera Klisurić, Marko N. Živanović, Dragana S. Šeklić, Snežana Sretenović, Marija Ilić, Jovana Bogojeski (2023)
    Cancer remains one of the world's deadliest diseases, claiming many lives each day. Transition metal complexes are leading candidates in developing anticancer agens with cisplatin used in chemotherapy worldwide. Copper, an endogenous metal in the human body, is especially attractive because of its typical redox biological activities and a relatively strong affinity to nucleobases. A series of Cu(II) complexes with ethane-1,2-diamine as the amine part and pentane-2,4-dione and/or 1-phenylbutane-1,3-dione, pentane-2,4-dione and/or 1,1,1- trifluoropentane-2,4-dione, or 1,1,1-trifluoropentane-2,4-dione and/or 1-phenylbutane-1,3-dione as the ...
    Inorganic Chemistry,General Chemistry

  • In vitro and in silico study of the biological activity of tetradentate Schiff base copper(II) complexes with ethylenediamine-bridge

    Aleksandar Mijatović, Nevenka Gligorijević, Dušan Ćoćić, Snežana Spasić, Aleksandar Lolić, Sandra Aranđelović, Milan Nikolić, Rada Baošić (2023)
    The biological activity of six structurally similar tetradentate Schiff base copper(II) complexes, namely [Cu (ethylenediamine-bis-acetylacetonate)] (CuAA) and five derivatives where two methyl groups are replaced by phenyl, (CuPP), CF3 (CuTT) or by mixed groups CH3/CF3 (CuAT), Ph/CF3 (CuPT), and Ph/CH3 (CuAP) has been investigated. The set of antioxidant assays was performed, and the results were expressed as IC50 and EC50 values. The series of complexes showed interesting bioactivity and were investigated for the determination of antioxidant, antifungal, antimicrobial, and ...
    Inorganic Chemistry,Biochemistry

  • Komparativna analiza završnih kontura površinskog kopa Drmno

    Dejan Stevanović, Dragan Ignjatović, Tomislav Šubaranović, Mirjana Banković, Petar Marković (2022)
    Definisanje optimalne završne konture površinskog kopa od suštinskog je značaja za ostvarivanje strateških ciljeva u razvoju rudarskih projekata. Savremeni programski paketi i metode za optimizaciju granica kopa, zasnivaju se na pronalasku završne konture koja obezbeđuje maksimalan profit. U slučaju površinskih kopova uglja, kod kojih osim profita postoji i čitav niz dodatnih kriterijuma i strateških ciljeva, princip optimizacije granica prema profitu, najčešće nije u potpunosti primenjiv. Iz rog razloga za uspešno definisanje granica površinskih kopova, neophodno je sagledati čitavu lepezu ...
    završna kontura, ugalj, komparativna analiza, optimizacija, strateški ciljevi

  • Turbidity simulation for short-term prediction: case study of the karst spring Surdup (Bor, Serbia)

    Marina Pešić, Vesna Ristić Vakanjac, Boris Vakanjac, Kostadin Jovanov (2016)
    Из перспективе снабдевања пијаћом водом, квалитет воде карстних издани је међу највишим, и често захтева само њихову дезинфекцију пре употребе. Међутим, карстне подземне воде изложене су одређеним притисцима. Током сушних периода углавном има мало воде, а током кишних периода има изненадних променa и квалитета и количине воде. Реакција слива на падавине је често брза и варијације у параметрима квалитета и квантитета (истицање, ниво вода, замућеност, укупан број микроорганизама, суспендовани нанос, итд.) су нестабилни. Ово захтева праћење истицања и ...
    водоснабдевање, карстно врело, истицање, мутноћа, симулациони модели

  • Fluid inclusion systematics in the Okoška gora polymetallic deposit

    Aleš Šoster, Miloš Velojić, Barbara Potočnik Krajnc, Matej Dolenec (2021)
    ... southern part ofthe Pohorje Mountains in northern Slovenia. The Pohorje Mountainsin its southern part consist ofmetasedimentary series belonging to the Eastern Alps, more precisely to the eclogite-bearing рап ој ће Koralpe-Weltz unit, which represents the upper (or middle) part of the Austroalpine imbricated ...
    ... hydrothermal model, but proposed i Paleozoic time of mineralization associated with emplacementof the Pohorje "ker: (granitic orthogneiss; now Permian). Their interpretation was based on petro observations of cuhedral pyrite and galena, which they attributed to blastic recrystal during the Cretaceous m ...
    ... U., Gerdes, A., Hofmann, M. & Marko, L. 2 to Early Cambrian crustal growth and orogenic zonih, Авсап Стаоп—Сопзтани from U-Pb zircon ages ani Germany). - Precambrian Research, 224, 236–278. Mioč, P. 1972: Basic Geological Map of Yugoslavia 1:100.000.5 to the Sheet Slovenj Gradec. Federal Geological ...

  • Rudničke vode olovo-cinkovih ležišta u rudnom polju „Blagodat“ u jugoistočnoj Srbiji

    Nebojša Atanacković, Veselin Dragišić, Vladimir Živanović, Ivana Cvejić, Saša Stojadinović, Ivana Jocić (2022)
    Rudno polje Blagodat sa više ležišta i pojava olovo-cinkovih ruda nalazi se u krajnjem jugoistočnom delu Srbije, blizu granica sa Bugarskom i Severnom Makedonijom. Eksploatacija ovog resursa vrši se podzemno u okviru rudnika Grot, ranije Blagodat. Prilivi podzemnih (rudničkih) voda u jamske radove rudnika Grot su visoki i iznose oko 130 l/s (septembar 2019), što ga trenutno svrstava u najovodnjenije rudnike sa podzemnom eksploatacijom u Srbiji. Nezavisno od njih, iz obližnjeg potkopa P-1 u ležištu Kula, ističe još 25 ...
    rudničke vode, ovodnjenost rudnika, prilivi rudničkih voda, kvalitet rudničkih voda

  • Influence of geological substrate on runoff formation, a case study: small river catchments in southeastern Serbia of similar size and with comparable pluviographic regimes

    Vesna Ristić Vakanjac, Veljko Marinović, Nikola Milovanović, Marina Čokorilo Ilić, Boris Vakanjac, Jugoslav Nikolić, Saša Bakrač (2022)
    We are witnessing climate change that is happening both, globally and, at the regionally - or local level. As a result of expected climate change in Southeast Europe, in the first place are the distributions of precipitation within the year (frequent extreme events are present) and then the increase in temperature, which already has a significant impact on evapotranspiration and runoff formed in a particular catchment area. In addition to climatic factors, the geological structure, i.e. the hydrogeological characteristics ...

  • Punctuated, episodic magmatism and mineralization of the Rogozna skarn-hosted Au-Zn-Pb-Cu deposits revealed through high-precision U-Pb zircon geochronology

    Sean P. Gaynor, Milorad D. Antić, Vladica Cvetković, Kristina Šarić, Urs Schaltegger (2023)
    The subvolcanic regions of magmatic centers are commonly associated with alteration, mineralization, and economic ore deposits, however the duration and frequency of mineralizing pulses within the overall lifespan of these centers can be poorly defined. Therefore, models for the formation of mineral systems require more highprecision geochronology data to refine their evolutionary models. Rogozna Mountain and its eponymous magmatic complex, located in SW Serbia, hosts multiple base metal deposits associated with variable rock types and structural expressions and serves as a natural laboratory to ...
    Skarnovska mineralizacija, Magmatsko-hidrothermalni sistemi, Subvulcanske intruzije, geohronologija na cirkonima, CA-ID-TIMS

  • 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
    ... during the Variscan orogeny (i.e. between 408 and 328 Ma, lower age limit is discussed further below). At this time, the central SMM was involved in a series of tec- tonic events related to amalgamation of eastern and west- ern parts of the Galatian super-terrane and its final collision = @ Springer ...
    ... facies (Dimitrijević 1997). In contrast, Devo- nian to Triassic greenschist facies meta-sedimentary rocks constitute the majority of the Western Veles series (Pavić et al. 1983; Grubić and Ercegovac 2002). The Veles series is considered to be a part of the Circum-Rhodope belt (Zagorchev and ...
    ... Lower Complex Lž F:| |00 Permo-Triassic magmatic rocks [I eastern Veles series — ——— Š |E uate-Variscan magmatic rocks |_____ sredna gora (undiff.) ___ OE ıate cambrian to Silurian magmatic rocks Struma Unit (undiff. Ge ti cu m IJ pre-Middle cambrian magmatic rocks - |00 Crnook-Osogovo-Lisets ...

  • Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia

    Nikola Burazer, Aleksandra Šajnović, Nebojša Vasić, Milica Kašanin-Grubin, Dragana Životić, João Graciano Mendonça Filho, Predrag Vulić, Branimir Jovančićević (2020)
    Stratigraphy,Economic Geology,Geology,Geophysics,Oceanography

  • Просторни положај лежишта угља Ђурђевик: геофизичко-геолошки модел

    Синиша Арсеновић (2019)
    Лежиште угља Ђурђевик представља источни део Бановићког угљеног басена и припада северној страни босанске офиолитске зоне унутрашњих Динарида у чији састав улазе стене палеозојске, мезозојске и кенозојске старости. Језерска доњомиоценска угљоносна серија изграђена је од лапоровито-глиновитих седимената са једним слојем мрког угља. Дебљина угљеног слоја креће се у интервалу од 5 до 25 m са генералним правцем пружања СЗ - ЈИ и падом према ЈЗ. У зони обухваћеноj геофизичким истраживањима изражена je пострудна тектоника у виду раседа мањег и ...
    рефлективна сеизмика, 3Д геофизичко-геолошки модел, угаљ, синтетички модел, моделирање
    ... made in high resolution, which was then degraded to the level at which it is possible to carry out the interpretation and reconstruction of the coal series with minimal acquisition resources. Due to a good seismic contrast between the coal series and the overlying and underlying sediments, the ...
    ... the coal seam ranges from 5 to 25 m. The general direction of coal seam is NW-SE while dipping to the SW. Within the zone covered by geophysical research, a post-ore tectonics is expressed as a fault from that directly affects the spreading continuity of the coal series. Within the investigated area ...
    ... on the interpretation of the 2D projection of the coal series in correlation with the available data of other exploration-exploitation works, it was possible to make a spatial interpretation as well as a reliable 3D model of the coal series. Keywords: reflective seismic, 3D geoph ...

  • Палеомагнетски резултати из Тимочког магматског комплекса, Источна Србија

    Весна Лесић, Емо Мартон, Драган Лукић, Весна Цветков (2018)
    ... investigation  showed  that  beside  the magnetite  the  andesite  also  contains  homogeneous  grains  of  hemoilmenite which corresponds to the intermediate member of the series with 53.34 mole% ilmenite  (Luković  et  al., 2017), but   our magnetic mineralogy  experiments  suggest different  composition.  ...
    ...  The samples were oriented in situ with the magnetic and/or sun compass. The  principal aim was  to  find out  if  the studied area was  involved  in a  large scale displacement during or  after the time covered by the samples.     METHODS    The  samples were  cut  into  standard‐size  specimens  and  ...
    ...  rotation.    INTRODUCTION     The Timok Magmatic Complex belongs to a volcano‐sedimentary complex of the Carpatho‐Bal‐ kanides known as Banatitic Magmatic and Metallogenic Belt (Berza et al., 1998). Geotectonically  it be‐ longs  to  a  the  Geticum  and  is  of  Upper  Cretaceous  age  (radiometric  ...