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Упит dcterms_creator_txt:John C. Mutter

775 items

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery

    Maja Milošević, Biljana Đorđević, Mihovil Logar (2020)
    калцит, сирова глина, традиционална керамика, Злакуса
    ... 1250 C - calcite — F- feldspar r ps 5 1000 š ž 750 ' 50 o 250 w O m 0 T T T ı 45 5 5 7 ć60 50000 ) sample ClBd c C- calcite Q-quartz 40000 -| Sm - smectite MI - mica/illite -} K/H - kaolinite/halloysite 530000 8 > 20000 } 10000 [7 ' KH /Sm M k m C O c cc c cc c 0 - ...
    ... carbonate is evident from a large band at ~950%C and a small endothermic band at ~750% (Fig. 5). Typical and strong decomposition effects for calcite begin at ~820%C, reach a peak at 950%C, slowly drop at 990% and afterwards end rapidly at ~1010*C, in accordance with previ- ous work (Beck, 1946; ...
    ... sample CIMx 125 -| in te ns it y (c ou nt s) in te ns it y (c ou nt s) Fig. 2. XRPD traces of the CIMx and CIBd samples together with oriented patterns of the clay fraction: untreated sample (AD), solvated with ethylene glycol (EG) and heated at 550"C (H). Clay Minerals Sample CIMx ...

  • Terenska nastava iz geofizike: Arheološki lokaliteti na području Trstenika

    Dragana Đurić, Jelena Vukčević, Dejan Vučković, Ivana Vasiljević, Vesna Cvetkov (2020)
    geofizika, geofizička istraživanja u arheologiji, arheologija u okolini Trstenika
    ... merenja, b) karta vertikalnog gradijenta ZMP, c) prikaz filtrirane karte pod b) u formi sen- čenog reljefa, d) pozitivna arheološka sondа (Марковић и др., 2017; Вучковић и др., 2017) 34 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l ...
    ... Универзитет у Београду Wynn, J. C. 1986. A review of geop- hysical methods used in archaeology, Geoarcheology International Journal, 1/ 3: 245-257. https://doi.org/10.1002/ gea.3340010302 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h ...
    ... sve do srednjeg veka (Рашковић, 2003). Slika 1. Geografski položaj istraživanih arheoloških lokaliteta 32 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e Lokalitet, koji je ...

  • ‘Blue-’ and ‘Brown-speckled’ pottery from Qalhât, the Sultanate of Oman (13–16th centuries): Comparison with traditional Omani 19–20 century productions

    Liliana Gianni, Hélène Renel, Aleksandar Kremenović, Philippe Colomban (2020)
    Representative ‘Blue speckled’ (13–16th centuries) and ‘Brown speckled’ (13–21st century) wares recovered from the excavations in Qalhât or collected around Bahlâ city (Sultanate of Oman) were characterized by XRPD, SEM-EDS, Raman/optical microspectroscopy, and thermal expansion. Minerals present in the body (quartz, augite and albite as major phases, calcite, dolomite, rutile, anatase, phosphate, hematite and magnetite as minor phases) were identified by XRPD and/or Raman spectroscopy. SEM-EDXS microanalysis was performed on the glazes in order to compare their composition, especially ...
    Firing, Glaze, Traditional ceramics, Provenance studies, Augite

  • Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova

    Zoran M. Štirbanović (2015-07-01)
    Rudarstvo, a u okviru njega i priprema mineralnih sirovina, se odlikuje složenošću tehnoloških procesa što je posledica velikog broja uticajnih parametara. Samim tim je potrebno biti veoma obazriv prilikom donošenja odluka u oblasti rudarstva. U cilju što efikasnijeg funkcionisanja procesa, moguće je primeniti različite metode koje služe za pojednostavljenje procesa odlučivanja. Jedna od takvih metoda jeste i teorija grubih skupova. Ona predstavlja relativno novu matematičku teoriju koja je pogodna za razumevanje nepreciznih i nepotpunih podataka kao i za otkrivanje ...
    rudarstvo, priprema mineralnih sirovina, teorija grubih skupova, višekriterijumsko odlučivanje, flotacijsko jalovište, flotacijski kolektor, flotaciona mašina
    ... Očigledno, ako je C’⊆C D-redukcija od C, onda je C’ minimalni podskup od C takav da γ(𝐶,𝐷) = γ(𝐶′,𝐷). • Reći ćemo da je atribut a∈C D-nepotreban u C, ako 𝑃𝑂𝑆𝐶(𝐷) = 𝑃𝑂𝑆(𝐶−{𝑎})(𝐷), u suprotnom je atribut a D-neophodan u C. • Ako su svi atributi a∈C C-neophodni u C, onda se C može nazvati ...
    ... ja M(D). 𝐶𝑂𝑅𝐸𝐷(𝐶) = �𝑎 ∈ 𝐶: 𝑐𝑖𝑗 = (𝑎), za neko 𝑖, 𝑗�. Skup C’ ⊆ C je D-redukcija od C, ako je C’ minimalni (s obzirom na inkluziju) podskup od C takav da je: C’∩ c ≠ ∅ za svaki ne prazan unos c (c≠∅) u MD(C). Prema tome, D-redukcija je minimalni podskup atributa koji razlikuje sve ...
    ... Podskup C’⊆C je D-redukcija od C, akko je C’ D-nezavistan i 𝑃𝑂𝑆𝐶(𝐷) =𝑃𝑂𝑆𝐶′(𝐷). Skup svih D-neophodnih atributa u C se naziva D-jezgro od C, i obeležava se sa CORED(C). U ovom slučaju takođe imamo svojstvo: 𝐶𝑂𝑅𝐸𝐷(𝐶) = ⋂𝑅𝑒𝑑𝐷(𝐶), gde je RedD(C) familija svih D-redukcija od C. Ako ...

  • Zbirka rešenih zadataka iz termodinamike

    Marija Živković, Aleksandar Madžarević (2023)
    termodinamika
    ... 12% CO 2 , 6% H 2 O , 5% O 2 i 77% N 2 , počet- nog stanja 0,9 MPa i 1000 °C izentropski ekspandira u turbini do pritiska 0,1 MPa, a zatim se izobarski hladi do 150 °C predajući toplotu vodi tem- perature 25 °C, koja se pri stalnom pritisku 0,2 MPa zagreva do stanja su- vozasićene pare. Za ...
    ... sa pokretnim klipom (pogledaj skicu). U početnom trenutku azot se nalazi na pritisku 800 kPa i tempe- raturi 127 °C. Gasu se dovodi toplota dok se ne dostigne temperatura od 527 °C. Klip će početi da se podiže kada se dostigne pritisak od 1500 kPa. Skicirati proces u p-v dijagramu i odrediti z ...
    ... entalpija rashladne vode čija je temperatura 25 °C, a pritisak 0,2 MPa: i krajnja specifična entalpija suvozasićene pare jednaka specifičnoj entalpiji suvozasi- ćene pare na pritisku od 0,2 MPa što je tablična vrednost: 25 kg vazduha temperature 500 °C i pritiska 0,7 MPa izentropski se širi do pritiska ...

  • Merenje i praćenje temperature u cevovodima

    Jelena Plećaš (2024)
    U završnom radu pod naslovom „Merenje i praćenje temperature u cevovodima“ istražuje se značaj merenja temperature u industriji. Opisuje se kako je merenje temperature ključno za efikasno upravljanje procesima i održavanje sigurnosti.Postoje i razvijene su brojne metode merenja temperature, od kojih svaka ima svoju specifičnu primenu, u određenim oblastima. Rad obuhvata pregled razvoja termometrije, različite temperaturne skale, kao i detaljan prikaz instrumenata za merenje temperature. Posebna pažnja posvećena je greškama dodirnih termometara i metodama korekcije.Na kraju,rad se fokusira na ...
    temperatura, instrumenti, senzori, termometri, cevi
    ... Isto. 12 za opseg temperatura od -200 "C do +350 *C. Kao termometarske tečnosti se koriste lako isparljive tečnosti kao što su: propan (od -40 *C do +40 *C), dietiletar (od +40 •C do +195 *C), etanol (od +85 "C do +290 *C) i ksilen (od +150 "C do +360 *C). Ova vrsta termometara se izrađuje sa ...
    ... kvarcnom sudu sa kapilarnom cevi. Najčešće korišćene tečnosti su: pentan (za temperature od -200 "C do +20 "C), etanol (za temperature od -110 *C do +50 *C) i živa (za temperature od -30 'C do +750 *C). Preciznost ovih instrumenata je visoka, naročito ako se kao termometarska tečnost koristi živa ...
    ... merenja iznosi od -75 "C do +550 "C. Greška merenja iznosi do 1,5% na 4 Petkovska, M. (2011). Merenje i upravljanje u procesnim sistemima. Beograd: Tehnološko-metalurški fakultet. 11 temperaturi kapilare i manometra od 20 "C i raste za oko 5% od početne greške za svakih 20 *C (zbog razlike u t ...

  • Fluid inclusion study in quartz of the Rudnik Pb-Zn-Cu-Ag skarn deposit, Serbia

    Stefan Petrović, Ronald J. Bakker, Vladica Cvetković, Rade Jelenković (2023)
    Six types of fluid inclusions were identified in three growth zones of hydrothermal quartz from the Rudnik skarn deposit. In the core zone, primary two-phase fluid inclusions of high (type 1) and moderate salinity (type 2) homogenized to liquid between 350-430 °C and 340-420 °C, respectively. Raman analysis revealed that the vapour phases are a CO2-CH4 gas mixture, with a predominance of CO2. The core contains and dispersed vapour-rich fluid inclusions of low salinity (type 3) composed of CO2-CH4-H2S ...

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... & Nikita- Martzopoulou, C. (eds), Geothermal Energy in the Spotlight, International Forum, 11–12 December 2009. Aristotle University of �essaloniki, �essaloniki, pp. 2–3. Hackley, C. P., Araujo, V. C., Borrego, G. A., Bouzinos, A., Cardott, J. B., Cook, C. A., Eble, C., Flores, D., Gentzis, T ...
    ... T. & Nikita- Martzopoulou, C. (eds), Geothermal Energy in the Spotlight, International Forum, 11-12 December 2009. Aristotle University of Thessaloniki, Thessaloniki, pp. 2-3. Hackley,C. P., Araujo, V.C., Borrego, G. A., Bouzinos, A., Cardott, J.B., Cook, C. A., Eble, C., Flores, D., Gentzis, T., Goncalves ...
    ... HC/g rock) released at 300 °C; S2 — HC generated during pyrolysis (mg HC/g rock) from 300 to 650 °C; S3 — amount of CO? generated from oxygenated functional groups (mg CO?/g rock); HI — hydrogen index = (S2 x 100)/TOC; mg HC/g TOC); T max — temper- ature of peak HC generation (°C). 5COMPOSITION OF ORGANIC ...

  • Alpine thermal events in the central Serbo-Macedonian Massif (southeastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Andreas Wetzel, Irena Peytcheva, Albrecht von Quadt (2015)
    General Earth and Planetary Sciences

  • Definition of Circulation Conditions and Groundwater Genesis of the Complex Krupaja Hydrogeological Karst System (Eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Tina Dašić (2023)
    Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment, Geography, Planning and Development, Building and Construction
    ... temperature is constant at around 8 "C (18.4–18.7 "C); this water comprises a mixture of cold and thermal water. The water emperature at the bottom of the borehole reaches a value of up to 25 "C. The groundwater emperature at the thermal spring, ranges from 25.9 to 26.6 "C, where lower temperatures were ...
    ... ranges from 10 to 11.4 "C, expressing its seasonal characteristics. The highest water temperature of 11.4 "C was recorded during, the summer period, which may be a consequence of the intrusion of lake water, minimum dischargje from the spring, and air temperatures up to 35 "C. The borehole groundwater ...
    ... the Beljanica Massif. | I |j Š B pa js ko Sp ri ng » »T he rm al sp ri ng Kr ul iB or eh ol e B- 1 “C (p MC ) 26>t3<3990 t3 %C (pMC) = 16.89 6%C = - 3.11 |“ GW age E 3990 god. t4 pjl Pzl a |rd f A bs Legend: • Hydrogeological features P Red Permian sandstone ...

  • Arsenopirit iz rudnih ležišta Šumadijsko-kopaoničke oblasti: paregeneza, sastav i produkti oksidacije

    Ivana N. Jelić (2023)
    Arsenopirit, FeAsS je čest pratilac polimetaličnih orudnjenja Šumadijsko-kopaoničke oblasti. Jedan je od sulfida koji u najvećoj meri koncentriše zlato. Nepoželjan je u rudama jer njegovom oksidacijom na jalovištima može doći do oslobađanja arsena koji spada u elemente toksične za životnu sredinu. U okviru ovog doktorata sistematski su ispitivani arsenopiriti iz različitih stadijuma i tipova orudnjenja rudnih ležišta i mineralizacija Šumadijsko-kopaoničke oblasti (Rudnik, Sastavci, Trepča, Gokčanica – Drenjak i Rujak, Golijska reka i Jurija). Uzorci arsenopirita ispitivani su polarizacionom mikroskopijom ...
    arsenopirit, zlato, skorodit, Šumadijsko-kopaonička oblast, parageneza, zonarnost
    ... povezuje strukture markasita i arsenopirita (sl. 2.1). Pmnn markasit A.B,C t2 - bližnjenje P112,/n A,B,C k2 - antifazni domeni C112,d = BilŽ1 = PŽ,IC arsenopirt a =2A a = 2B a”'=A-B b'= 2B b=c b”=-c C=C CcC=2A c ' =A+B 1. podešavanje 2. podešavanje 3. podešavanje Slika 2.1. Odnos ...
    ... deponovanja ispitivanih arsenopirita po ležištima obuhvaćenim ovom tezom: Golijska reka = 540 ?"C, Jurija = 530 "C, Sastavci = 490 "C, Rudnik = 480 "C, Drenjak * 460 "C, Rujak = 450 "C i Trepča = 390 "C (za lokalitete u kojima je određen at.% As na vise uzoraka data je prosečna vrednost). Sve dobijene ...
    ... arsenopiritske invariantne tačke određena je kao 702 "C + 3"C, dok gasni pritisak za ovu tačku nije meren, ali je zaključeno da iznosi približno 1 bar. Za prirodne arsenopirite tačka topljenja je 703 C + 3"C (Clark, 1960 b). 10 Na 688 C+ 3”?C nalazi se druga invariantna tačka za koju je nepoznat ...

  • Quantitative analysis of syllable properties in Croatian, Serbian, Russian, and Ukrainian

    Biljana Rujević, Marija Kaplar, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Jan Mačutek (2021)
    slogovi, distribucija rang-preciznost, slovenski jezici

  • Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems

    Dejan Ćebić, Nebojša M. Ralević (2021)
    нелинеарне једначине, поступци засновани на срединама, вишеструки корени,

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants
    ... min-1, FID) coupled to an Agilent 5975C mass selective detector (70 eV) was used. The column was heated from 80 to 310 °C, at a rate of 2 °C min-1, and the final temperature of 310 °C was maintained for an additional 25 min. Detailed analyses of the target compounds were conducted using the following ...
    ... confluence into the Danube River (c). Peak assignments: n-alkanes are labelled according to their carbon number; Pr – pristane; Ph – phytane. ____________________________________________________________________________________________________________________________ (C) 2014 SCS. All rights reserved ...
    ... _____ (C) 2014 SCS. All rights reserved. Available online at: www.shd.org.rs/jscs/ ORGANIC MATTER IN THE TISZA RIVER SEDIMENTS 607 TABLE VI. Source and maturity parameters calculated from the distributions and abundances of steranes and diasteranes Sample % C27 a % C28 b % C29 c C29αα(S)/ ...

  • Sinteza i karakterizacija vanadata alkalnih metala sa elementima retkih zemalja

    Anđela Jovanović (2024)
    Predmet i cilj pisanja ovog rada su sinteza i karakterizacija vanadata alkalnih metala sa elementima retkih zemalja. Prilikom ovih istraživanja, ispitivan je sistem REE2O3–V2O5–KF, gde REE predstavlja trovalentni katjon izabranih elemenata retkih zemalja (Y, Sm, Eu, Gd, Er, Yb). Ovo istraživanje bazirano je na sintezi kristala, nakon čega su dobijeni kristali posmatrani pod binokularnom lupom, analizirani metodom rendgenske difrakcije na polikristalnom materijalu (XRPD) i metodom skenirajuće elektronske mikroskopije sa energetsko-disperzivnom spektroskopijom (SEM-EDS), kako bi se utvrdile karakteristike dobijenih kristala. ...
    elementi retkih zemalja, sinteza kristala metodom fluksa, vanadati alkalnih metala, rendgenska difrakcija, SEM-EDS metoda

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology

  • Back-arc underplating provided crustal accretion affecting topography and sedimentation in the Adria microplate

    Paolo Mancinelli, Vittorio Scisciani, Cristina Pauselli, Gérard M. Stampfli, Fabio Speranza, Ivana Vasiljević (2021)
    Supported by evidence of deep crustal sources for the observed magnetic anomalies in Central Italy and by outcropping gabbros in the Croatian archipelago, we model the observed gravity and magnetic anomalies in the Central Adriatic Sea and surroundings. We suggest that the major magnetic anomalies in the area are related to a wide underplating and propose that this volume represents the first stage of the back-arc Adria continental breakup in Early Permian times. During the Palaeotethys-Adria collision, underplating has ...
    Underplating, akrecija kore, Magnetske anomalije, Jadranska ploča

  • Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis

    Ivan Kojić, Achim Bechtel, Reinhard Sachsenhofer, Dragana Životić, Ksenija Stojanović (2019)
    ... temperatures ог 400 "С (Pyr400). 450 *C (Pyr450) and 500 *C (Pyr500). This temperature range was chosen according (0 data from thermogravimetric analysis which inđicate that the first significant mass 1055 (after releasing ог moisture) occurs between 400 "С and 500 %C. Aliphatic апд aromatic fractions ...
    ... long-chain homologues. Оп the other ћапд, аП ноша pyrolysates have similar distributions ог n-alkanes with the prevalence ог mid-chain homologues (C?-C>s5) and the equal abunđance ог odd and even numbeređ n-alkanes (Carbon Preference Index, CPI ~ 1). ја lignite extracts 67С was measured only оп С)5-С31 ...
    ... designate configurations at C,; and С шћорш DHC – dihydro-ar-curcumene: IPN – 2-methyl-1-(4'-methylpenty1). 6-isopropylnaphthalene МН – monoaromatic hopane; ОН – diaromatic hopane; TeNLH – tetranor-lupa-1,3,5(10), 6 8,11,13- heptaene; ТеН – tetraaromatic ћорапе; BE – C;; Бепгоћорапе; N –парћфајепе; ...