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Упит dcterms_creator_txt:O’Reilly Susann Y

608 items

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... (8) 52 A () _1%N-1 c=yŽi=1 Ji After calculating the centroid, it is possible to use x,and y-to create a new representation of the contour, according to equation (10). z(k) — (Xx — X-) + j(yk — y-) (10) A common boundary-based shape descriptor is the Fourier descriptor. With this representation ...
    ... LEARNING FOR DIAGNOSING THE OPERATION OF A DEEP WELL PUMP IN OIL PRODUCTION • pogyjnTaT colucTBeHoOr HcTpa;KHBaukor palna; • J 3aBpHiHM paji y HeJIMHHM HMH y JIeJIORMMa HHje OMO HpeJUIOXKeEH 34 CrMHaMeC JIpyre JHHIIOMC Ha CTyHHjCKHM HporpaMHMa Pyjapcko-reonnomikor (bakyanrrera H HpyrHx BHCOKOTHIKOJICKHX ...
    ... HOJMALMH MOTy CC OOjaBHTH Yy CJICKTDOHCKOM KaTajory H y myOmHKauHjaMa Pynapcko-reo:otmikor (bakyarrcra. 'V Beorpany, 17.09.2024. 75 O6pasauy 3 H3JABA O KOPHIITREbY 3ABPIIIHOT PAJIA OnnamhyjeM 0M0nnaoTeky Pynapcko-reo:nmomikor (bakyanrrera na y JlraraniHi peno3HTopHjyM yHece MOJ 3aBpiiHH paji ...

  • Tektonska evolucija istočne periferije timočke eruptivne oblasti

    Stefan Zujić (2024)
    U radu su predstavljeni rezultati proučavanja tektonskih i litostratigrafskih karakteristika istočnog oboda Timočke eruptivne zone. Zaključci o geološkim odnosima u okviru Timočke eruptivne oblasti i susednih geotektonskih jedinica izvedeni su na osnovu podataka prikuljenih tokom terenskih istraživanja i podataka dobijenih iz publikovanih radova. Rezultati rada ukazuju da je teren koji je bio tema ovog istraživanja, u strukturno-tektonskom smislu oblikovan tokom glavnih geodinamičkih događaja u okviru Karpato-balkanskog orogenog luka. Analizom strukturnog sklopa su utvrđeni glavni deformacioni događaji koji su predsavljeni ...
    tektonska evolucija, timočka eruptivna oblast

  • Development of terminological resources for expert knowledge: a case study in mining

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Aleksandar Cvjetić (2015)

  • Analiza toplotne moći i Vobeovog indeksa prirodnog gasa različitog porekla

    Lana Mitrović (2024)
    U radu su prikazane najznačajnije osobine prirodnog gasa, uključujući hemijski sastav, jednačine sagorevanja i termodinamičke karakteristike koje predstavljaju osnovu za dalje razumevanje rada. Prikazane su količine prirodnog gasa na evropskom trţištu prema zemlji porekla, kao i njihove zasebne hemijske i termodinamičke karakteristike.Kvalitet prirodnog gasa u Republici Srbiji je posebno poglavlje u radu u okviru kog je detaljnjije opisano snabdevanje Republike Srbije prirodnom gasom, kao i zahtevani kvalitet.Na kraju, obuhvatajući sve prethodno navedeno, prikazan je postupak rešavanja Studije slučaja koja ...
    prirodni gas, toplotna moć, Vobeov broj, zahtevani kvalitet prirodnog gasa, namešavanje

  • Tretman mulja iz procesa čišćenja uglja Bogutovo selo - Ugljevik

    Marijana Pavlović (2024)
    U ovom završnom radu sprovedeno je istraživanje sa osnovnim zadatkom da se utvrde osobinе mulja, kao nus-proizvoda procesa čišćenja uglja iz rudnika mrkog uglja „Ugljevik” po Parnaby tehnologiji.Na osnovu toga ispitana je mogućnost njegovog korišćenja u svojstvu autogene suspenzije u samom postupku čišćenja uglja i na kraju pronađe optimalno rešenje, kojim bi se obezbedilo njegovo tehnološki i ekološki bezbedno i racionalno tretiranje i deponovanje uz ponovno korišćenje prečišćene vode kao povratne vode u procesu. Ciljevi pomenutog istraživanja bi se ...
    tretman mulja, otpadne rudarske vode, zgušnjavanje, filtriranje, zatvoreni ciklus
    ... KaTajloOry H y nyOmHKauHjaMa Pynapcko-reononikor (bakyarrera. y Beorpany, / Qq.#f· 2090G. TIornuc crynenHra O06pasau 3 H3JABA O KOPHII TRER y 3ABPIIIHOr PAJIA OpaanhyjeM OOmaoTeky Py,napcko-reojtomrkor Qakynrera na y /{irgranHn peno3HTopHjyM yHeCe MOJ 3aBPIHHH Pp4a)jL H01 HaCJIOBOM: _JlpeuvuciH ...
    ... PAJIA ; y MHwe H npe38HMe cTyaneHTa ,L/ap_bgaHa J 'Q@?đđđ) Bpoj HHXleKca PQ'H j5 Hs3jaBmbyjeM na je 3aBPIIHH Pa}Ji II0J1 H4ACJIOBOM T% vi a - N c ap ” JH(ŽČ·WWŽM%Q Uhx GpOufC0 duu/hfkha__UL/bQ Egujuođy cee – UA/ LO Cuk • pe3yjraT COIICTBEHOr HcTpa;KHBaukor pala; • / 3aBpHIHH pajl y HCJIHHH ...
    ... HH y JIĆJIOBHMA HHjc OHO Hpc;UIOXeH 34 CTHHLAMbC JIpyrc JMHIJIOMC Ha CTy)UHjCKHM HporpaMHMa Pyjapcko-reomoikor (pakynrera HnH Jnpyrax BHCOKOILHIKOJICKHX yCTaHOBa; • nacy pe3ynraTH KOPpČKTHO HaBC/ICHH H • a HHCaM KpHo/ma ayToOpcka npaBa H kopHcTHo/Ha HHTeJIeKTyaJIHy CBOJHHy JIpyrHx mua. y Beorpany ...

  • Data from the Digital Repository of the Faculty of Mining and Geology in eScience (eNauka)

    Biljana Rujević, Mihailo Škorić (2024)
    The paper describes linking the Digital Repository of the University of Belgrade, Faculty of Mining and Geology, with the eScience system in terms of transferring metadata about the results of researchers' scientific work. The steps taken to ensure a smooth harvesting of metadata are outlined. Additionally, a presentation of additional improvements to the OAI system is provided, aiming to contribute to the automatic linking of authors with their results in the eScience system.
    репозиторијуми, еНаука, метаподаци, Рударско-геолошки факултет

  • Numerical modelling of a single intra-oceanic subduction for the origin of the Balkan ophiolites

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2024)

  • Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event

    Barbara V. Radulović, Lubomir S. Metodiev, Neda Motchurova-Dekova, Platon Tchoumatchenco (2023)
    Brachiopods, taxonomy, biostratigraphy, early Toarcian Anoxic Event, Bulgaria

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... RARE EARTH ELEMENTS AND SOIL 11 7. Y. Takaya, K. Yasukawa, T. Kawasaki, K. Fujinaga, J. Ohta, Y. Usui, K. Nakamura, J. Kimura, Q. Chang, M. Hamada, G. Dodbiba, T. Nozaki, K. Iijima, T. Morisawa, T. Kuwahara, Y. Ishida, T. Ichimura, M. Kitazume, T. Fujita, Y. Kato, Scientific reports 8 (2018) ( ...
    ... (https://doi.org/10.1038/s41598-018-23948-5) 8. Y. Kato, K. Fujinaga, K. Nakamura, Y. Takaya, K. Kitamura, J. Ohta, R. Toda, T. Nakashima, H. Iwamori, Nature Geoscience 4 (2011) 535 (https://doi.org/10.1038/ngeo1185) 9. Y. Wan, C. Liu, J. Rare Earths 23 (2005) 377 10. G. W. Beall, B. H. Ketelle ...
    ... parameters n and kf, and thus the equation is obtained (3): log q = log kf + 1/n log c1, (3) where log kf in the diagram represents the intercept at y axis, and 1/n the line inclination.26 Table II presents the values of the initial mass of the metallic ion (x0) - the mass of ions in solutions divided ...

  • Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)

    Saša Ivanišević, Dejan Radivojević (2018)
    Exploration for oil and gas in mature areas, such as the Pannonian Basin, can benefit from reexamination of old data using more advanced modern workflows that focus on the temporal and spatial aspects of sediment deposition. Specifically, we apply a new environment of deposition model that interprets the Upper Miocene- Pliocene sediments as being deposited in a rapidly filling basin characterized by quick shelf edge progradation from the northwest toward the southeast. Reconstruction of this shelf edge trajectory reveals ...
    naftna geologija, depozicione sredine, formacije, Panonski basen

  • Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal

    Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)
    glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo
    ... Mater. 2003, 97, 219–243. [CrossRef] 23. Wang, Y.-H.; Lin, S.-H.; Juang, R.-S. Removal of heavy metal ions from aqueous solutions using various low-cost adsorbents. J. Hazard. Mater. 2003, 102, 291–302. [CrossRef] 24. Ma, Y.; Lv, L.; Guo, Y.; Fu, Y.; Shao, Q.; Wu, T.; Guo, S.; Sun, K.; Guo, X.; Wujcik ...
    ... Methylene Blue from aqueous solution by activated carbon prepared from pea shells (Pisum sativum). J. Chem. 2013. [CrossRef] 40. Liu, L.; Lin, Y.; Liu, Y.; Zhu, H.; He, Q. Removal of methylene blue from aqueous solutions by sewage sludge based granular activated carbon: Adsorption equilibrium, kinetics ...
    ... microscope and a CCD detector, with a diode pumped solid state high-brightness laser (532 nm) and a 10× objective. The powdered sample was placed on X–Y motorized sample stage. The analysis of the scattered light was carried out by the spectrograph with a grating 900 lines/mm. The laser power was 1 mW ...

  • Tehničko tehnološki parametri izrade bušotine X

    Marko Savović (2024)
    U ovom završnom radu obrađena je analiza i procena efikasnosti bušenja u naftnom polju X, uz poseban osvrt na probleme vezane za osipanje lapora i bubrenje gline.Istraživanje je sprovedeno sa ciljem unapređenja bušačkih metoda, optimizacije bušaće opreme i minimizacije zastoja tokom rada. Detaljno su prikazane faze bušenja, cementacija zaštitnih cevi, testiranja. Rad uključuje analizu postignutih kapaciteta ispiranja, performanse korišćenih alata, te preporuke za poboljšanje efikasnosti bušenja. Rezultati pokazuju da su glavni problemi nastali u formacijama sa nehomogenim svojstvima, kao ...
    izrada bušotine, ispirni fluidi, cementacija, dleta, zaštitne kolone
    ... KaTanory H y ITyOnHKaNHjaMa Pynapcko-reonomor (paky:reTa. y Beorpany, 31. 10. 2024. IIormnc crynegHra 70 Oopasmj 3 H3JABA O KOPHIIIThEM5Y 3ABPIIIHOT PAJTA OpnamfiyjeM OHOmHoTeky Pynapcko-reomnomkor (bakynreTa na y /[HrHranHuH penmo3HTOpH]yM ,yHece MOJ 34BDITHH pa/ji I10,1 HACJIOBOM: ...
    ... 34BDITHH paj1 1071 HAC:1OBOM 'TexHWMuKO TeXHOJIOIIIKI napaMeTpi M3pajte 6yiioTHHe X • pe3yjaT COIICTBEHOT HCTpakHBakKor pa/na, • a 34BpIHHH pa;i y HeJHHH HH y He;IOBHMA HHje OHO HpejVIO;KeH 32 CTHIARE Hpyre TIHIIJTIOME Ha CTy/(HJCKHM IIporpaMHa Pyjnapcko-reomomor (aky:rreTa HH pyrHx BHCOKOIHIKOJTCKHX ...
    ... mpenao/na panH Ojaraba y J{HrHTajHOM pemo3HTOpHJyMy PynapckKo-reoOmomrkor (akynreTa. Z{o3BoJbaBaM a Ce OOjaBe MOjJH :THHHH ITO/TA11H Be3aHH 32 /[OOH|aRbe aKAJIEMCKOT 3BaMba, KaO ITTO Cy HME H IIpe3HM6, TOJ1HHa H MecTO poljeFba H naTyM 0/10paHe pajna. OBH JHHHH IHIOMMAHH MOTy Ce OOJABHTH y čReKTpOHCKOM KaTanory ...

  • An optimal sixteenth order family of methods for solving nonlinear equations and their basins of attraction

    Dejan Ćebić, Nebojša Ralević, Marina Marčeta (2020)
    нелинеарна једначина, 16.ред конвергенције, оптималне методе, подељене разлике

  • On the compatibility of lexical resources for NooJ

    Ranka Stanković, Miloš Utvić, Duško Vitas, Cvetana Krstev, Ivan Obradović (2012)
    Lexical resources for many languages are provided for the NooJ linguistic development environment. Meta-data descriptions of morphosyntactic and semantic properties of these languages and their resources are a mandatory part of each language module. In this paper we analyze how well the meta-data actually describe resources for a chosen subset of languages and to what extent are they compatible across languages to support multilingual processing. We show that there is place for improvement in both directions.
    ... O+AO2+PDR+PDT+IMT+GPS+GP P+s+p+1+2+3+m+f+n+np+cp+sp Bg s+p+0+d+h+l+o+v+c+f+m+n+y+z+i+a+t+1+2+3+b+w+x+A+B+C+K+ P+F+M+N+R+E+D+I+Y+Z+X+W+Q Sr m+f+n+1+2+3+4+5+6+7+s+p+w+v+q+g+i+a+b+c+d+k+W+P+A+I+Y +G+T+F+S+X+x+y+z+h Table 4. Analysis of *.def metadata: INFLECTION Proceedings of the 2011 I ...
    ... 1+2+3 F+G+H+J+K+P+Q+S+T+U+Z Hr S+p m+f+n 1+2+3 INF+INFk+PR+IMP+AO+PDR+PDT+ IMT+GPS+GPP+PER+FUT1+FUT2 Bg S+p f+m+n 1+2+3 R+E+D+I Sr S+p+w x+y+z W+P+A+I+Y+G+T+F+S+X Table 3. Analysis of *.def metadata: VERBS The final table pertaining to results of the analysis of *.def files, namely Table 4 ...
    ... the same features are often differently coded, as for example the three values for person in the case of Serbian verbs, which are coded with x, y and z, as opposed to all other languages which use 1, 2 and 3. While the latter can be considered a mainly technical issue, there are some other, ...

  • Knowledge and Rule-Based Diacritic Restoration in Serbian

    Cvetana Krstev, Ranka Stanković, Duško Vitas (2018)
    In this paper we present a procedure for the restoration of diacritics in Serbian texts written using the degraded Latin alphabet. The procedure relies on the comprehensive lexical resources for Serbian: the morphological electronic dictionaries, the Corpus of Contemporary Serbian and local grammars. Dictionaries are used to identify possible candidates for the restoration, while the dataobtainedfromSrpKorandlocalgrammarsassistsinmakingadecisionbetween several candidates in cases of ambiguity. The evaluation results reveal that,dependingonthetext,accuracyrangesfrom95.03%to99.36%,whilethe precision (average 98.93%) is always higher than the recall (average 94.94%).
    diacritic restoration, morphological dictionary, corpus, word n-grams, local grammars
    ... extension in the hierarchy tree ( ”Y”), extension only by subclass relations (”L”), etc. In every step, automatically derived concepts in the category description can be edited. For example, the music category can be described with the single concept Musical artY , where Y means full expansion to lower ...
    ... principles and methods. Data & knowledge engineering, 25(1-2):161–197. Veale, T. and Hao, Y. (2008). A context-sensitive framework for lexical ontologies. The Knowledge Engineering Review, 23(1):101–115. Wilks, Y. (2009). Ontotherapy, or how to stop worrying about what there is. Recent advances in natural ...
    ... Ministry of Education and Science of the Russian Federation (project N 14.601.21.0018). References Azarova, I., Braslavsky, P., Zakharov, V., Kiselev, Y., Ustalov, D., and Khohlova, M. (2016). Integration of thesauri russnet and yarn. In Proceedings of Conference ”Internet and Modern Society”, pages 7–13 ...

  • Аnaliza mogućnosti povećanja nagiba završne kosine površinskog kopa “Podbraćan”

    Vladimir Čebašek, Veljko Rupar (2018)
    Eksploatacijom boksita iz ležišta "Podbraćan" formiran je površinski kop sa maksimalnom visinom zavšne kosine od 280 m. Redovnom kontrolom stabilnosti trenutnog stanja kosina površinskog kopa utvrđeno je da faktor sigurnosti iznosi Fs = 1.71 – 1.85, a što je ukazalo da postoji mogućnost povećanja nagiba kosine. U radu je prikazan postupak analize mogućnosti povećanja nagiba završne kosine površinskog kopa "Podbraćan".
    stabilnost kosina, povećanje nagiba kosina, metoda konačnih elemenata

  • Primjena magnetometrijskih ispitivanja na arheološkom lokalitetu Nedeljkova humka

    Mirko Petković, Vesna Cvetkov, Milorad Ignjatović, Dejan Naumov (2020)
    ... 11689 vrijednosti vertikalnog gra- dijenta geomagnetskog polja. 28 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 Magnetometrijska je istraživa- nja obavljeno protonskim magnetome- ...

  • 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
    ... NojamMH MOTy CeČ OGjaBMTM y ČJIČKTpOHCKOM KaTaHoOry H y ny0OjkannjaMa Pyaapcko-reojnomikor (bakyarrera. y Beorpayy, _C.00.700%. Tlornuc cry/reHra 57 O0pasauy 3 H3JABA O KO!PMIJIT . E,Bby 3AEPILHOT PAJIA „OpnamhyjeM GaGnaoreKy Pynapcko-reojourkor (pakyjrrcra a y JiuraranniH penosHTopHjyM ...
    ... HaCJIOBOM Texw ~ OhyWM(Fa — OMewA _ ekulyia kk _Pa M am? } v·muaJ (bayja • pegayjrraT coricTBEHOr MCTpajcdnatkKor paja: • J 3aBPpHIHH paji y IeJIMHH HH y JIeJOBHMAa HHJc OHO Ipe,UIO)KeH 3a CTHILAFbe Jipyre JUHIIJIOME Ha CTyJWHjCKHM IiporpaMHMa Py/juapckKo-reojonikor (pakyjrrera HH JipyrHx BH ...
    ... 3041\ %_M_CTMCJ Č'/m·}u KojH je MOje ayTOpCKO JIČJIO. 3aBpmuHH paji Ca CBHM IIpHJIO3HMa Hp)iao/Ja CaM y C.H:TDOHCKOM ()opMaTy TIOrOJIHOM 30 TpajHo apxHBHpabe. Moj naBpmmHH pajl O/UIOXKEH y lHrHTajHOM penosHTopHjyMy Py/lapcKO-reOJIOHIKOT (akyarrera je (aaokpyotcumu Jeony 69 oae omjuje): @ ...

  • Preparation, synthesis and characterization of nanometric Ca0.9Er0.1MnO3

    Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)
    ... archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs R Y O U N G S C I E N T I S T S IN C E R A M I C S UEĆ čS Ć ONFE RE NJCJE LONG SCIENTISTS, IN CERAMICS 15% ECerS CONFERENCE for YOUNG ...
    ... Biljana Pajin Printing layout Vladimir V. Srdić, Marija Milanović, Ivan Stijepović Press , TRI 0 Štamparija, Aranđelovac CIP – Karanorunauuja y nyOnakannju BuOnuoreka Marurnce cpricke, HoBu Cajn 666.3/.7(048.3) CONFERENCE for Young Scientists in Ceramics (15 ; 2023 ; Novi Sad) Programme ...

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... Dy, Y, Er, Tm, Lu. Fe, K, Na, Pb, Th, Sm, Eu, Ho, Yb, Lu, HREY. Li, V, La, Pr, Nd, Dy, Y. rash=0.35–0.49 Sdb, Mg, Mn, As, Cu, Zn, Pr. Mo, Zn. Mg, Co, Cu, Mo, Pb, Rb, Se. Negative correlation with ash yield rash= -0.34–0.34 Ca. Mg, Mn, As, Cd, Co, Ni, Rb, Sr, La, Ce, Pr, Nd, Dy, Y, Er ...
    ... inorganic affinity (rash=0.5–0.69; Table 8) include: Fe, Na, Cd, Co, Li, Mo, Ni, Se, Th, Tb, Dy, Y, Er, Tm, Lu (in the seam I); Fe, K, Na, Pb, Th, Sm, Eu, Ho, Yb, Lu (in the seam II) and Li, V, La, Pr, Nd, Dy, Y (in the seam III). Some elements, such as Mg, Mn, As, Cu, Zn and Pb, in seam I; Mo, Zn, in ...
    ... Th, Ce, Sm, Eu, Gd, Tb, Ho, Er, Yb, Lu, MREY, HREY. rSi = 0.5–0.69 Fe, Na, Co, Ni, Pr, Eu, Tb, Dy, Y, Er, Tm, Yb, Lu, HREY. Fe, K, Pb, Th, Sm, Eu, Yb, Lu, HREY. Li, V, La, Pr, Nd, Dy, Y, LREY. Sdb – total sulphur content, dry basis wt.%; Note: Values of the correlation coefficients for individual ...