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Упит dcterms_subject_txt:juvelirski minerali

476 items

  • Three new Sr-bearing arsenates, hydrothermally synthesized in the system SrO–MO–As2O5–H2O (M2+ = Mg, Cu, Zn)

    Tamara Đorđević, Ljiljana Karanović (2018)
    During systematic research on the mineral-related synthetic arsenates, with particular focus on their structural and spectroscopic classification, three new Sr-containing arsenates Sr2Mg(AsO4)2· 2H2O (1), Sr2Zn4(AsO4)4·H2O (2) and Sr2Cu7(AsO4)6 (3) have been synthesized under low-temperature hydrothermal conditions in the system SrO MO As2O5 H2O (M 2þ = Mg, Zn, Cu). Their crystal structures were determined using room-temperature single-crystal X-ray diffraction data and refined to the following R-values: 1– R1 = 0.025; 2– R1 = 0.030; 3– R1 = 0.035. Compounds ...
    стронцијум, арсен, арсенати, кристална структура, дифракција рендгенских зрака на монокристалима, хидротермална синтеза, Раманска спектроскопија

  • Phase and microstructural study of urinary stones

    Miljana Mirković, Anja Dosen, Suzana Erić, Predrag Vulić, Branko Matović, Aleksandra Rosić (2019)
    In this paper we present the phase and morphological characteristics of urinary stones from Serbian patients. The study included for the first time the determination of the phase composition and a statistical analysis of the presence of different types of urinary stones in both men and women in Serbia. The main goal of study was representation of collected data for the first time. For past three years, more than 600 samples were collected from Serbian patients. The phase composition ...
    бубрежно камење, фазни састав, статистика, рендгенска дифракција праха, скенирајућа електронска микроскопија

  • 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

  • Adsorption and Polymerization of Aniline on Cu(II)-Montmorillonite:  Vibrational Spectroscopy and ab Initio Calculation

    M. Ilić, E. Koglin, A. Pohlmeier, H. D. Narres, M. J. Schwuger (2000)
    Batch adsorption experiments in the presence of oxygen were performed to study the interlayer reactions of aniline on Cu(II)-montmorillonite in aqueous solutions. At concentrations below a critical value of CC ) 2.6 mmol dm-3 only a colored Cu(II)-aniline complex is formed, characterized by a stability constant of log(Kassoc/dm3 mol-1) ) 1.5. At concentrations beyond Cc aniline polymerizes yielding a dark brown product, which is identified by two vibrational spectroscopy techniques, attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and ...
    Анилин, адсорпција, полимеризација, Cu(II)-Монтморилонит, ФТИР, аб инитио прорачун

  • Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema

    Svetlana M. Štrbac-Savić (2016-06-10)
    Efikasnost predstavlja preduslov za opstanak svake rudarske kompanije, posebno u uslovima izuzetno konkurentnog trţišnog okruţenja kao što je to rudarska industrija. Efikasnost oznaĉava sposobnost kompanije da ispuni svoje kratkoroĉne ili dugoroĉne ciljeve. Operativna efikasnost se definiše kao odnos izmeĊu ulaznih parametara potrebnih za odvijanje proizvodnje i pokazatelja dobijenih proizvodnjom. U kontekstu rudarskog poslovanja, operativna efikasnost se odnosi na vreme potrebno da se mineralno dobro transformiše u novĉana sredstva. Visoka operativna efikasnost se postiţe kada se ostvari prava kombinacija karakteristika ...
    podzemni rudnik, operativna efikasnost, prognoza, teorija sivih sistema, stohastiĉke diferencijalne jednaĉine, simulacija
    ... operational efficiency refers to the length of time until mineral assets are transformed to money. Peak operational efficiency occurs when the right combination of mineral deposit characteristics, human resources, mining technology, and mineral processing come together to optimize mining performance ...
    ... dobijanje minerala. Ona posebno koristi prednost razliĉitih fiziĉko-hemijskih svojstava površine minerala, njihovu vlaţnost, koja moţe biti prirodno svojstvo ili veštaĉki promenjena hemijskim reagensima. Promenom hidrofobnosti ili hidrofilnosti stanja njihove površine, ĉestice minerala suspenzovane ...
    ... vazduha prolaze kroz pulpu sve do njenog površinskog dela i formiraju skramu, koja se zajedno sa prilepljenim hidrofobnim mineralima uklanja. Talog koji sadrţi hidrofilne minerale se ulanja sa dna floatacijske ćelije. U skladu sa tim, sve vrednosti intervala [a, b] su jednako verovatne, pa se koristi ...

  • Arhitektonsko-građevinski kamen Crne Gore, stanje i potencijali

    Darko Božović, Vladimir Simić (2023)
    arhitektonsko-građevinski kamen, rezerve, kvalitet, potencijalnost

  • Exhumation history of the Juhor Mts. in central Serbia, the Northern Serbo–Macedonian Subunit

    Uros Stojadinovic, Hannah Pomella, Nemanja Krstekanić, Bojan Kostić, Maja Maleš, Nikola Randjelovic, Miloš Radonjić (2024)
    Northern Serbo–Macedonian Subunit, low-t thermochronology, kinematic analyses, extensional deformations

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... Enrico Sciubba Received: 27 May 2016; Accepted: 3 November 2016; Published: 10 November 2016 Abstract: The technological process of exploitation of mineral resources and processing of mined ores to cater to the market results, among other things, in a large amount of tailings deposed on tailing ponds. ...
    ... Republic of Serbia contributes 10% to the total gross domestic product for production of basic metals and metal products [6]. In mines with metallic mineral ores, concentration of heavy metals in tailing has increased. This is why the problem of environmental protection is severe in systems like Mining ...
    ... an administrative unit of the Kosovska Mitrovica area and in the municipalities of Zvečan and Mitrovica. The tailings are polymetallic and their mineral compositions are mostly heavy metals, as they were extracted from ore. In the process of creation and expansion of these five tailing ponds, material ...

  • Distribution of Uranium and Rare Elements in Radioactive Phosphate-Bearing Anomalies in Southeast Mongolia

    Boris Vakanjac, Neil Rutherford, Vesna Ristić Vakanjac, Tanita Đumić, Suzana Đorđević Milošević (2020)
    Soviet and Mongolian geologists initiated geological exploration of Mongolia for minerals after World War II (1945). These activities lasted until the breakup of the USSR in 1991. As part of this exploration systematic uranium and rare element exploration was undertaken across Mongolia. New exploration resumed in Mongolia at the beginning of the 21st century for a range of ore and mineral deposit styles including uranium, coal, base and precious metals and Fe-ore. This was generally undertaken by Western-based companies. This ...
    uran, radioaktivnost, kreda, retki elementi, fosfati, anomalije, Dornogobi

  • 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
    ... Umin N=19 imylonitc • lneadon N shear-zone % foliation foliation outside" % ihe shear:zone - Vranjska Banja area - see Figure 8 • Mineral lineation • bi-afold axis of Fa = byi-afold axis of F+ + bi- afold axis of F, Southern part of the Lmin Lower Caomplex N=6 Fig.4 Lower ...
    ... O 42 *% 0' N || ~ N y j }a ~ AOI NM / i w\ S 1673 “ Outcrop-scale high conf. “ Outcrop-scale low conf. m Microstructure s Mineral lineation elongate ribbons of quartz, plunges gently in north-west- south-east direction (Ly, in Fig. 4b). The fold axes b, of large recumbent ...
    ... Unit, although they show evidence of higher metamorphic grade than the greenschist facies typical for the Vlasina Unit (Babović et al. 1977). Mineral assemblages in Vranjska Banja area showing the peak metamorphic conditions of 530-585 "C at 5.2–6.1 kbar (0.52-0.61 GPa, i.e. the bound- ary ...

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... characteristics, the most important of which are: the participation of the main mineral elements [12], mineral grain size [13], arrangement of mineral grains and their shape [14], mutual contact between individual mineral grains [15], and level of alteration [16]. In the analyzed samples D and AD, it ...
    ... Lithological column of the exploration borehole. Test samples D and AD undoubtedly show the same structural-textural character- istics, as well as the mineral composition. Only the intensities of secondary alterations, calcification, limonitization, and chlorination are different (Figure 2). The analyzed ...
    ... solutions. It was determined that AD has a yellow-pale brown to greyish color due to noticeable limonitization, which weakened the bond between individual mineral grains and significantly affected the strength of the rock material. Knowledge of mineralogical-petrographic characteristics of rock material is essential ...

  • Distribution of Potentially Toxic Elements in the City of Zintan and Its Surroundings (Northwestern Libya) by Surface Soil Sampling

    Boris Vakanjac, Zorana Naunović, Vesna Ristić Vakanjac, Tanita Đumić, Saša Bakrač, Jana Štrbački, Vuk Gajić, Taher Mohamed Alzarog (2023)
    The study area is the city of Zintan, in northwestern Libya, which has grown over the past 30 years. Its current population is roughly 30,000. Although the city is in part commercial, most of the population engages in agriculture and primarily grows cereal crops (wheat and barley). The demand of the growing city for agricultural products has increased, intensifying the use of fertilizers, pesticides, and insecticides. Consequently, concentrations of potentially toxic elements (PTE) in the soil have increased. To ...
    Geologija, Geotehničko inženjerstvo, Inženjerska geologija

  • Hypogene speleogenesis related to porphyry magmatic intrusions and its influence on subsequent karst evolution in the Peruvian high Andes

    Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre (2022)
    Earth-Surface Processes

  • Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations

    Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković (2021)
    The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...
    severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija
    ... between them (Fig. 5, Table 1). Each thin-section was cut parallel to the stretching lineation in the sample. We used optical microscopy to determine mineral assemblages, metamorphic grade, and micro-scale deforma- tions in the Serbo-Macedonian, Supragetic and their contact. The microstructures were analysed ...
    ... muscovite shows intense folding and transposition of older foliation observed by rarely preserved isoclinal fold hinges (Fig. 5b). Based on the observed mineral assemblage and recrystallization features of the main rock-forming minerals, we estimate that the primary metamorphic event that affected the Northern ...
    ... at temperatures of 500–550 °C and pressure of 0.5–0.7 GPa, with a potential retrograde overprint, presu- mably in greenschist facies. A similar mineral assemblage is observed in the sample taken at the Serbo-Macedonian/Supragetic contact (point V2, Fig. 5c–e; Table 1), but with a more dominant muscovite ...

  • 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

  • Indeksi kontrole održavanja i korišćenja rotornog bagera

    Jovana Mitrović, Predrag Jovančić, Dragan Ignjatović, Stevan Đenadić, Filip Miletić (2023)
    Razvoj površinske eksploatacije se u velikom stepenu zasniva na svestranoj mehanizaciji rudarskih radova. Kako bi se zadovoljili potrebni kapaciteti, neophodna je primena savremene mehanizacije, velikih kapaciteta i pouzdanosti u radu. Naime, sa stepenom povećanja mehanizovanosti radova smanjuje se broj zaposlenih radnika, povećava produktivnost rada, smanjuju troškovi po jedinici proizvoda, a samim tim i povećava ekonomičnost površinske eksploatacije. Predmet istraživanja su rotorni bageri SRs 1200 koji predstavljaju samohodne mašine kontinuiranog dejstva namenjene za otkopavanje jalovine i korisne supstance na površinskim ...
    rudarstvo, rotorni bager, indeksi održavanja, indeksi korišćenja, TOPSIS

  • Osnovi hidrogeologije

    Petar Dokmanović (2021)
    hidrogeologija, atmosferska voda, površinske vode, podzemne vode, vodni bilans, poroznost stena
    ... (specifične) gustine minerala od kojih je stena sačinjena (tabele 6.7.1.1. i 6.7.1.2). Tabela 6.7.1.1. Gustine čvrstih čestica pojedinih minerala [26-adaptirano] Mineral ρs(g/cm3) Mineral ρs(g/cm3) Kvarc 2,65 Amfibol 2,8–3,6 Feldspati 2,45–2,76 Olivin 3,3–3,4 Minerali glina 2,6–2,8 Kalcit 2 ...
    ... Živanović, 2014): rastvaranje minerala, taloženje, kompleksacija, redoks reakcije, sorpcija i jonska izmena. Voda je jedan od najboljih rastvarača u prirodi. Pod hemijskim rastvaranjem minerala podrazumeva se prevođenje mineralne materije, u vidu jona, u vodeni rastvor. Minerali su jonska jedinjenja, čije ...
    ... nti u vidu : prostih jona, molekula, koloidnih i lebdećih čestica, kao i u vidu minerala i organskih kompleksa. Izvori mikrokomponenti u PV najčešće su rudni minerali (Zn, Cu, Pb, Ag, Mo, U, As), akcesorni minerali (Be, Se), organske materije (J, Mo), morska voda (J), kao i magmatske, metamorfne ...

  • A Data Driven Approach for Raw Material Terminology

    Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja (2021)
    The research presented in this paper aims at creating a bilingual (sr-en), easily searchable, hypertext, born-digital, corpus-based terminological database of raw material terminology for dictionary production. The approach is based on linking dictionaries related to the raw material domain, both digitally born and printed, into a lexicon structure, aligning terminology from different dictionaries as much as possible. This paper presents the main features of this approach, data used for compilation of the terminological database, the procedure by which it has ...
    sirovine, rudarstvo, terminologija, rečnik, terminološka aplikacija, mobilna aplikacija, digitizacija, leksički podaci, korpusi, otvoreni povezani podaci
    ... other disciplines. There is also a small bilingual dictionary of mineral processing [17] with 2415 transla- tion pairs, in both directions, English to Serbian and Serbian to English, but also without definitions. Finally, a glossary of mineral processing terms with 1400 definitions in Serbian is used at ...
    ... by a subdomain marker, as for example, entries related to mineral processing (251), transport (243), or underground mining (469). Additional semantic labels were also assigned, for example, material (699), device (536), machine (384), mineral (313), facility (288), instrument (279), etc. The part-of-speech ...
    ... identification systems. Appl. Sci. 2020, 10, 1726. [CrossRef] 12. Graham, R.L. Dictionary of Mining, Mineral & Related Terms; US Bureau of Mines: Washington, DC, USA, 1996. 13. Dictionary of Mining, Mineral and Related Terms (an EduMine Tool). Available online: http://xmlwords.infomine.com/ xmlwords.htm ...

  • Tehno – ekonomska ocena ležišta bakra i zlata u istočnoj Srbiji

    Strahinja Sarajlić (2024)
    U svrhu postizanja optimalnih rezultata pri eksploataciji ovog ležišta bakra i zlata, koje se nalazi u istočnom delu Srbije, biće primenjena metoda podetažnog zarušavanja rude i okolnih stena.Tehno-ekonomska ocena opravdanosti eksploatacije rude bakra iz ovog ležišta, urađena je na bazi projektovanih parametara datih u tehničkom projektu. Urađena je analiza i ocenjena je rentabilnost ovog projekta na bazi predviđenog veka eksploatacije od 19 godina.Procenjeno je da je investicioni projekat u celini rentabilan i ekonomski potpuno opravdan. opravdan.
    tehno – ekonomska ocena, investicioni projekat, otvaranje rudnika, metoda otkopavanja, ekonomska ocena, kapitalna investicija
    ... mineralizacije temeljno su opisane. Ustanovljeni su granulometrijski sastav mineralne sirovine, morfologija srastanja rudnih minerala, Bondov indeks, flotabilnost minerala, mineralni sastav i karakteristike jalovine, kao i prostorna distribucija korisnih i štetnih komponenata u ležištu, koncentratu ...
    ... porfirskim subvulkanskim intruzivnim stenama, kao i prostorna lokalizacija u tvorevinama prve vulkanske faze Timočkog magmatskog kompleksa. Rudni minerali su deponovani iz hidrotermalnih rudonosnih fluida koji su vršili intenzivne metasomatske promene na okolne stene andezitskog sastava. Sa aspekta ...
    ... dobijanje metala bakra. Ovo ležište prema sadržajima bakra i zlata kao osnovnih rudnih komponenti pripada grupi bogatih ležišta. Najzastupljeniji minerali bakra i pratećih asocijacija elemenata u sastavu rudonosnog sistema su: kovelin, pirit, enargit, luzonit, bornit, teludiri zlata, kalaverit (Au) ...

  • English for Geology Students. 1

    Lidija Beko (2023)
    Engleski jezik
    ... author. Mom bratu Milanu Table of contents 'Predgovoybo .. . OJ JAJNNJ.I....OJ0...j. .EOL .. J..JOJOL BMR a .. 9 •Unit1l• MINERALS Partl MINERAL EVOLUTION.............vtea e 12 Pre-solar minerals..................a a a oa 14 Vocabulary....Rh... .v . OM .. NN cg 16 Reading Comprehension ...
    ... pismenost naših studenata na konkretan, real- ističan i koherentan način. Udžbenik je jednostavan i jasno organizovan oko 6 tematskih celina: 1. Minerali 2. Fosili kroz vreme 3.Vreme i starost stena – istorijat geoloških teorija 4. Kretanje kontinenata 5. Stenski ciklus, magmatske stene i vulkani ...