Претрага

Упит dcterms_creator_txt:Panaitescu C.

773 items

  • 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; ...

  • The subthermal potential of karstic groundwater of Kučaj–Beljanica region in Serbia estimated by the multivariate analysis

    Ljiljana Vasić, Dragana Ž. Živojinovic, Vladana Rajaković-Ognjanović, Huang Fen, Cao Jianhua (2021)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia)

    Nikita Bragin, Nevenka Đerić (2020)
    Radiolaria, Dinarides, Jurassic, stratigraphy, Serbia
    ... hungaricus KOZUR C Parahsuum sp. R Quarkus japonicus (YAO) C Helvetocapsa matsuokai (SASHIDA) C Eucyrtidiellum sp. cf. E. unumaense s.l. (YAO) R Quarticella sp. C Parvimitrella sp. R Campanomitra? sp. A sensu O’Dogherty, Goričan & Gawlick, 2017 R Praewilliriedellum sp. C C Hsuum sp. cf. H ...
    ... H. matsuokai ISOZAKI & MATSUDA R Praewilliriedellum convexum (YAO) C Parahsuum sp. cf. P. izeense (PESSAGNO & WHALEN) C Parahsuum sp. R Takemuraella veghae (GRILL & KOZUR) R R Hsuum sp. cf. H. baloghi GRILL & KOZUR C Quarticella sp. D sensu O’DOGHERTY, GORIČAN & GAWLICK, 2017 R Hexasaturnalis ...
    ... (GRILL & KOZUR); P – Praewilliriedellum convexum (YAO). Figs. A-C, E-I – sample 15-10-7; Figs. J, K – sample 15-10-8; Figs. D, L-P – sample 15-10-10. Scale bar – 80 μm for figs. C, N and P; 50 μm for figs. A, B, D-M, O. G eo lo g ia C ro a tica Bragin and Djerić: Age of the Jurassic hemipelagic ...

  • Digital Library From A Domain Of Criminalistics As A Foundation For A Forensic Text Analysis

    Dalibor Vorkapić, Aleksandra Tomašević, Miljana Mladenović, Ranka Stanković, Nikola Vulović (2017)
    U ovom radu predstavljen je model koji omogućava prikupljanje, pripremu, opis metapodataka, upravljanje i eksploataciju, uključujući pretragu punog teksta dokumenata iz domena kriminalistike napisanih na srpskom jeziku. Predloženi pristup primenjuje se na veb portalu koji sakuplja različite tekstove nastale iz časopisa Akademije za kriminalistiku i policijske studije, Krivičnog zakona Srbije, konferencija „Tara“ i „Reiss“, kao i iz nekih doktorskih disertacija vezanih za ovu oblast istraživanje. Nakon obrade teksta, korpus koji sadrži preko 5500 stranica običnog teksta, kreiran je i ...
    Omeka, Wordnet, pretraga punog teksta, morfološka i semantička pretraga teksta, proširenje upita
    ... Processing (CALP) '2007, Borovets, Bulgaria, C. Orasan, S. Kuebler (eds.), pp. 25-32, September 2007. file:///C:/Users/Dalibor/Downloads/concord/9222659%209222680%2050516%2014 file:///C:/Users/Dalibor/Downloads/concord/21661640%2021661659%20120846%2023 file:///C:/Users/Dalibor/Downloads/concord/23035 ...
    ... 293%2023035323%20129275%2024 file:///C:/Users/Dalibor/Downloads/concord/8404192%208404220%2046393%205 file:///C:/Users/Dalibor/Downloads/concord/6530708%206530736%2036206%203 file:///C:/Users/Dalibor/Downloads/concord/15285480%2015285505%2086203%2021 file:///C:/Users/Dalibor/Downloads/concord/935062 ...
    ... 3%209350649%2051290%2015 file:///C:/Users/Dalibor/Downloads/concord/21524194%2021524219%20120089%2022 file:///C:/Users/Dalibor/Downloads/concord/1891404%201891429%2010355%200 file:///C:/Users/Dalibor/Downloads/concord/8854774%208854802%2048743%2012 file:///C:/Users/Dalibor/Downloads/concord/2182246% ...

  • Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

    Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)
    sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija
    ... concrete mixtures for 1 m3 of concrete are given in Table 3. Table 3. Mix proportion of concrete mixtures for 1 m3 of concrete. Component E-C P10-C P15-C P20-C P25-C Cement [kg (m3)] 375.00 (0.119) 336.32 (0.107) 316.78 (0.101) 297.32 (0.094) 277.67 (0.088) Slag [kg] - 33.16 (0.015) 49.65 (0.022) 66.08 ...
    ... 003) SUM 2437 (0.981) 2425.37 (0.981) 2420.31 (0.981) 2415.26 (0.981) 2407.86 (0.981) Assumed air content ~2% ~2% ~2% ~2% ~2% Component E-C P10-C P15-C P20-C P25-C Cement [kg (m3)] 375.00 (0.119) 336.32 (0.107) 316.78 (0.101) 297.32 (0.094) 277.67 (0.088) Slag [kg] - 33.16 (0.015) 49.65 (0.022) 66.08 ...
    ... 0.104 5.19 ± 0.122 5.88 ± 0.134 5.67 ± 0.115 5.11 ± 0.128 Table 5. Physical properties of fresh and hardened concrete. Parameter Unit E-C P10-C P15-C P20-C P25-C Consistency: slump test mm 240 ± 12.3 180 ± 11.6 140 ± 10.4 90 ± 8.2 20 ± 6.5 Air content in fresh concrete % 2.5 ± 0.25 3.4 ± 0.32 4.1 ± ...

  • Izdvajanje vode iz prirodnog gasa

    Dejan Nedeljkov (2024)
    U radu je istaknuto važnost prirodnog gasa kao vitalna komponenta svetske energetike.Spada u najsigurnije,najčistije i najkorisnije fosilno gorivo. Sama pojava vode u vidu vlage u gasu je pokazatelj lošeg kvaliteta gasa. parametri koji mogu dovesti do lošeg kvaliteta prirodnog gasa kao pokazatelj je Wobbe index.U okviru istraživanja u master radu glavni problem funkcionisanja na KPG Paliću predstavlja vlaga u gasu,takođe se može zaključiti da kvalitet gasa zavisi od Wobbe indeksa odnosno, što je Wobbe veći, čistiji je gas, ili ...
    prirodni gas, separatori, separacija, grejači, čileri, tačka rose, Wobbe indeks
    ... Aktivni boksit se dobro regeneriše na temperaturama od 120%C do 150%C a aluminijum-oksid od 175%C do 200%C. Molekularna sita se regenerišu protokom vrelog gasa, bez sadržaja H»S i CO», kroz paket adsorbenta.Temperatura gasa je od 149%C do 204%C. Visoke temperature imaju negativan uticaj na adsorbente ...
    ... rezultati merenja 2 R. vreme Pus Tus PIs TIs P2s T2s Piz Tiz Ppun Tpun Maseni Razlika Trenutni Ptre Wobbe | Tačka Br. (bar) (*C) (bar) ("C) (bar) ("C) (bar) ("C) (bar) (*C) kumulativ između dva protok (bar) | Bndex | rose merila na KPG očitavanja (kg/h) utakalištu kumulativa Qtotal(kg) (kg) ...
    ... rezultati merenja R. vreme Pus Tus PIs TIs P2s T2s Piz Tiz Ppun Tpun Maseni Razlika Trenutni Ptre Wobb | Tačka broj (bar) ("C) (bar) ("C) (bar) ("C) (bar) ("C) (bar) (*C) kumulativ između dva protok (bar) | index | rose merila na KPG očitavanja (kg/h) utakalištu kumulativa Qtotal(kg) (kg) ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija