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Упит dcterms_subject_txt:chemical analysis

753 items

  • Novi model za postizanje optimalne proizvodnje na naftnom polju Amal

    Elnori Elmabrouk Ali Elhaddad (2015-04-16)
    Doktorskom disertacijom analizirani su i proučavani problemi proizvodnje nafte iprimenjene metode za njihovo rešavanje na naftnom polju Amal. Ukratko jeprikazana proizvodnje nafte u Libiji, njene karakteristike i rezerve, da bi se videoznačaj ovog naftnog polja.Utvrđeno je da su na naftnom polju Amal ključni problemi koji prate procesproizvodnje taloženje parafina, pojava slojnog peska, neefikasan rad gasliftsistema, neefikasna desalinizacija nafte i ekološki problemi. Proizvodniproblemi, pojedinačno i više njih zajedno, na nekim bušotinama uzrokovali susmanjenje proizvodnje nafte od 40 do 75%. Zbog ...
    nafta, proizvodnja, optimizacija, Amal, Libija
    ... Regarding more efficient solution of the paraffin deposition problems, it has defined a set of new actions that must be taken. The analysis of the application of chemical inhibitors has been performed, and the application of thermal method of tubing heating has been proposed. As a solution for ...
    ... am C.R., Al-Otaibi M.B. (2006) Building inferential estimators for modeling product quality in a crude oil desalting and dehydration process, Chemical Engineering and Processing: Process Intensification, Volume 45, Issue 7, 568-577. Abilov F.A., Orudjev A.G., Lange R., (1999) Optimization of ...
    ... reports/amal-oil-field-redevelopment-libya-commercial-asset-valuation. Amal (2011), Production data. Ancheyta J., Fernando T. (2009) Asphaltenes: chemical transformation during hydro-processing of heavy oils. New York, NY, USA: CRC Press Taylor & Francis Group. APPA (2011), African Petroleum Producers ...

  • Integrated Stratigraphy of the Middle–Upper Jurassic of the Krížna Nappe, Tatra Mountains

    Renata Jach, Nevenka Đerić, Špela Goričan, Daniela Reháková (2014)
    carbon and oxygen isotopes, radiolarians, calcareous dinoflagellates, radiolarites, Krížna Nappe, West ern Carpathians, Tethys
    ... ef a/l., 2013). METHODS The sections (Table 1; Figs 3-8) were analysed at high resolution, including microfacies analysis, carbonate con- tent, biostratigraphy, and analysis of carbon and oxygen iso- topes. Microfacies as well as the cysts of calcareous dinofla- gellates were studied in 240 ...
    ... Previous studies from the Western Tethyan region have proved the value of carbon isotope ratios in the stratigraphic and palaeoenvironmental analysis of carbonate successions (e.g., Bartolini et al., 1996; Jenkyns, 1996; Jenkyns ef al., 2002; Padden ef a/., 2002; Weissert and Erba, 2004; Louis- ...
    ... ) at 70%C, using the Kiel IV online carbonate pre- paration device, connected to the Thermo-Finnigan Delta+ mass spectrometer. The quality of analysis was controlled by measurements of the international standard NBS-19 with any sample series (3–5 NBS-19 measurements per samples series). All ...

  • Resource-based WordNet Augmentation and Enrichment

    Ranka Stanković, Miljana Mladenović, Ivan Obradović, Marko Vitas, Cvetana Krstev (2018)
    In this paper we present an approach to support production of synsets for SerbianWordNet(SerWN)byadjustingPrincetonWordNet(PWN)synsetsusing several bilingual English-Serbian resources. PWN synset definitions were automatically translated and post-edited, if needed, while candidate literals for Serbian synsets were obtained automatically from a list of translational equivalents compiled form bilingual resources. Preliminary results obtained from a setof1248selectedPWNsynsetsshowthattheproducedSerbiansynsetscontain 4024 literals, out of which 2278 were offered by the system we present in this paper, whereas experts added the remaining 1746. Approximately one half of ...
    WordNet, bilingual resources, term alignment, parallel lists
    ... the average number of literals per synset in PWN is 2.01, whereas the average number of literals per synset in SerWN is 1.66. After the initial analysis, we used the 20,221 aligned synsets to produce a parallel list of 72,262 literals for the purpose of this research. For example, we used the aligned ...
    ... these resources. One of the goals of our approach is to further develop the semi-automatic procedure to enable automatic evaluation, periodical analysis and automatic extraction of XML synsets structure for further processing and integration into SWN with sumo, sentiments, relations etc. In our approach ...
    ... 47003 and 178006. References Baccianella, S., Esuli, A., and Sebastiani, F. (2010). Sentiwordnet 3.0: An enhanced lexical resource for sentiment analysis and opinion mining. In Chair), N. C. C., Choukri, K., Maegaard, B., Mariani, J., Odijk, J., Piperidis, S., Rosner, M., and Tapias, D., Eds., Proceedings ...

  • Classification of mining waste landfills according to legislation in Serbia

    Dragana Nišić, Uroš Pantelić, Nikoleta Aleksić, Neda Nišić (2021)
    rudarski otpad, jalovina, uredba, deponija, kategorija A, klasifikacija
    ... [15] Guerra, M. B. B, Teaney, B. T, Mount, B. J, Asunskis, D. J, Jordan, B. T., Barker, R. J, Santos, E. E. and Schaefer, C.E.G, Post-catastrophe analysis of the Fundão Tailings dam failure in the Doce River sy- stem, Southeast Brazil: potentially toxic elements in affected soils. Water, Air, & ...
    ... Although risk assessment is not imposed as an obligation through the Bylaw, procedures that directly or indirectly refer to the results of risk analysis and embankment breach calculation are suggested on several occasions through the classification process. By applying the cla- ssification on a ...
    ... flotation tailings management facility of copper mine, it was found that the realistic risk-based classification of landfills requires a very detailed analysis of all criteria leading to the final category. Key words: mine waste, tailings, Bylaw, landfill, category A, classification https://www.kos ...

  • Stratigraphic implications of the Mio-Pliocene geodynamics in the area of Mt. Avala: new evidence from Torlak Hill and Beli Potok (Belgrade, Serbia)

    Ljupko Rundić, Meri Ganić, Slobodan Knežević, Dejan Radivojević, Miloš Radonjić (2019)
    Mt. Avala is located on the southern margin of the Pannonian basin (SPB), a border zone between the uplifted morphostructures of the Dinarides and Carpathian-Balkanides. Similar to the Pannonian basin, tectonostratigraphic evolution of the Mt. Avala area during the last 23 Ma has is characterized by syn- and post-rifting processes as well as tectonic inversion. Here, we present the results of field investigations of the Miocene‒Pliocene dynamics that led to different spatial positions of the same stratigraphic units (e.g. ...
    мио-плиоценска геодинамика, јужни Панонски басен, Авалски и Торлак хорст, Белопоточки трог, Србија
    ... quality information i.e. a small number of measured structural elements (no systematic measurements of the direc- tion of inclination of layers, stress analysis, etc.) as well as the morphological diversity of the area were the main reasons for geomorphologic consideration in order to try to identify the ...
    ... addition, these observations are connected with an estimation of the structural elements based on a DEM terrain model and general (not sys- tematic) analysis of linear relief structures. In other words, this approach was forced due to circumstances but, in our mind, useful. The wider study area occupies ...
    ... Miocene sedi- ments (Figs. 17 and 20). Except for some individual measurement of faults and strata orientation within the different Miocene units, the analysis of the fault systems was performed by the interpretation of digitally generated terrain of the wider area of Mt. Avala (Fig. 17a) which is supported ...

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... depending on user choice. Over the base map two layers are displayed: polygons singled with remote sensing method and polygons resulting from the analysis of exploitation authorizations, requests for recultivation and field visits. Figure 2 Main page of the Cadastre of abandoned mines of Vojvodina ...
    ... works. If a permit for exploitation exists, the provincial and republican cadastral numbers (list numbers) are recorded. 3.4 Reporting and data analysis Within the reporting system it is possible to obtain a report of all data on an abandoned mine: register, titleholder, objects, coordinates ...

  • Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine

    Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina (2015)
    ... blasting and geologic characteristics of the soil, being determined on the basis of test blasting for the specific work environment. In this paper, an analysis of the method for the determination of soil oscillation law parameters has been conducted, suggested by Profesor M. A. Sadovski. The applicability ...
    ... 0695 13 15.2808 1.2227 1.0784 1.2227 +0.1443 0 14 16.5314 0.5276 0.9762 1.0882 -0.4486 -0.5606 Based on the data in Table 3, a statistical analysis was carried out and the following values were obtained: For model 1: The curveline dependency index 1 between the reduced distance R and soil ...

  • Legal framework for recultivation of degraded areas caused by mining exploitation

    Radmila Gaćina (2023)
    Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...
    rekultivacija, melioracija, otkopavanje uglja, zakonska regulativa
    ... acceptance of the main content should include: reclaimed land area, surface cover thickness, ground slope and drainage function, the physical and chemical properties of the soil are in line with the standards of arable land, and the failure to meet the acceptance criteria, should not pass the acceptance ...
    ... – to meet the present and future needs of the local population and the region”. 30 Gaćina R. Considering the concept of recultivation, the analysis of researchers" views on the concept of “recultivation” shows that it is increasingly being replaced by the terms “revitalization”, “renaturation” ...
    ... 3390/resources9060073 GUO, ., ZHENGI H., YUSHENG L. (2022). "Causes and Countermeasures for the Failure of Mining Land Use Policy Reform: Practice Analysis from China" Land 11, no. 9: 1391. https://doi.org/10.3390/land11091391 SKOUSEN J, ZIPPER C (2014) Post-mining policies and practices in the Eastern ...

  • 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

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation

  • Neogena i kvartarna herpetofauna (Anura i Squamata) Srbije : doktorska disertacija

    Dragana D. Đurić (2019)
    U radu je prvi put opisan deo herpetofaune (Anura i Squamata) iz neogenih i kvartarnih lokaliteta Srbije. Obrađeni su lokaliteti Sibnica, Prebreza, Lazarevc, Vračević i Riđake, neogene starosti. Lokaliteti kvartarne starosti su pećine Mala i Velika Balanica, Pešturina, Hadži Prodanova, Baranica, Vrelska pećina i sedimentne ispune fisura u kamenolomima Venčac i Beočin. U radu je prikazana je taksonomska analiza herpetoloških ostataka. Pored taksonomske analize fosilnog materijala dat je kratak geografsko-geološki opis proučavanih lokaliteta, osnovne osteološke karakteristike anura i skvamata ...
    paleoherpetofauna, Anura, Squamata, kvartar, pleistocen, neogen, Srbija, paleoekologija, paleoklima
    ... fillings of the Venčac, Beočin quarries as Quaternary localities were processed. The paper presents a taxonomic analysis of herpetological remains. In addition to the taxonomic analysis of fossil material, a short geographical and geological description of the studied sites, the basic osteological ...
    ... al characteristics of the anura and squamata, as well as their tafonomic characteristics were given. Taxonomic analysis included 2300 samples that were classified into the 35 taxa, total of the 23 species and 9 genera from 15 families have been identified. A part of the material was determined ...
    ... Telescopus cf. T. fallax Fleischmann, 1831; Malpolon cf. M. monspessulanus (Hermann, 1804). The comparative tafonomic, stratigraphic, paleoecological analysis, as well as comparison of literature data and the recently published studies, give confirmation of temporal variation in distribution of taxa ...

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia

    Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol (2021)
    This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...
    grandite, garnets, skarn, Rudnik
    ... garnet beco- mes a suitable geochemical tracer. Such application is suppor- ted by its common presence in skarn deposits and its high physical and chemical stability during weathering. Additio- nally, this mineral is easy recognizable under the microscope, and quite often macroscopically, as well. The ...
    ... initial first stage by infiltration of external hydrothermal fluids into the system. The pulse of magmatic- derived hydrothermal fluids has caused chemical overstepping of the previous garnet formed in equilibrium, leading to dis- continuity in garnet composition. The full process of partitioning major ...
    ... Rare-earth element mobility during hydrothermal and metamorphic fluid-rock interaction and the significance of the oxidation state of europium. Chemical Geology 93, 219–230. https://doi.org/10.1016/0009-2541(91)90115-8 Brković T. 1980: Explanatory booklet for sheet Kragujevac. In: Basic Geological ...

  • Towards the semantic annotation of SR-ELEXIS corpus: Insights into Multiword Expressions and Named Entities

    Cvetana Krstev, Ranka Stanković, Aleksandra Marković, Teodora Mihajlov (2024)
    Овај рад представља активности на развоју корпуса ELEXIS-sr, српском додатку вишејезичном анотираном корпусу ELEXIS-а, који се састоји од семантичких анотација и репозиторија значења речи. ELEXIS је паралелни вишејезични анотирани корпус на десет европских језика, који може да се користи као вишејезички репер за евалуацију европских језика са мање и средње развијеним ресурсима. Фокус овог рада је на вишечланим изразима и именованим ентитетима, њиховом препознавању у скупу реченица ELEXIS-sr и поређењу са анотацијама на другим језицима. Разматрају се први кораци ...
    полилексемске језинице, именовани ентитет, вишезначност значења речи, складиште смисла, LLOD

  • Trace elements and garnet formation in a distal skarn zone: a case study of the Rudnik deposit, Central Serbia

    Bojan Kostić, Pavle Tančić, Natalija Batoćanin (2024)
    geohemija granata, retke zemlje, fluidne inkluzije, skarnovsko ležište Rudnik

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... is set by contract is accepted, it is sufficient to stack coal in (only) 16 layers. However, the diagram was plotted based on results obtained by analysis of a certain number of samples from the entire deposit. Not considering the representativeness of the simulated data there is always suspicion ...
    ... stacker has a minimum travel speed (around 2-4 m/minute), which then restricts the minimum number of layers. This consideration should include an analysis of the stacker's operating capacity. This capacity depends on the operating capacity of the pit, which is quite variable in short intervals (second ...

  • Infotheca (Q25460443) in Wikidata

    Ranka Stanković, Lazar Davidović (2021)
    Vikipodaci su baza znanja Zadužbine Vikimedija koja predstavlja zajednički izvor različitih vrsta podataka koje koriste ne samo drugi Vikipedijini projekti, već sve više i brojne aplikacije semantičkog veba. U ovom radu ćemo prezentovati primer integracije Vikipodataka sa digitalnim bibliotekama i eksternim sistemima, kao i mogućnost ubrzanja pripreme i unosa podataka na primeru radova iz časopisa za digitalnu humanistiku Infoteka.
    semantički veb,otvoreni povezani podaci, vikpodaci,Infoteka, metapodaci časopisa
    ... which enables numerous applications in the domain of natural language processing. Let’s mention some of them: text classification, indexing, text analysis, summarizing, nor- malizing, linking, etc. Another important feature is multilingual support, making it possible to link each item to a label in any ...
    ... alignment for improving corpus search.” The Electronic Library. Krstev, Cvetana, Jelena Jaćimović, Branislava Šandrih, and Ranka Stanković. 2019. “Analysis of the first Serbian Literature Corpus of the Late 19th and Early 20th century with the TXM platform.” In Book of abstracts of DH_BUDAPEST_2019, ...

  • Izbor rotornih bagera za proces revitalizacije: primer rotornih bagera SRs 1200 u rudarskom basenu Kolubara

    Predrag Jovančić, Dragan Ignjatović, Stevan Đenadić, Filip Miletić, Goran Todorović, Dragan Novaković (2020)
    Revitalizacija je proces ili skup tehničkih zahvata na mašini kojim se vrši zamena svih dotrajalih ili oštećenih delova metalne konstrukcije. Sastavni deo procesa revitalizacije je i modernizacija zastarele elektro-mašinske opreme. Principi revitalizacije sasvim sigurno nisu sadržani u okviru redovnog godišnjeg ili dnevnog održavanja. Oni predstavljaju održavanje onih veličina koje su značajne za mašinu kao celinu (u ovom slučaju rotorni bager). U ovom radu su analizirani rotorni bageri oznake SRs 1200. Na površinskim kopovima rudarskog basena Kolubara takvih bagera ima ...
    Rotorni bageri, revitalizacija, SRs1200

  • 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

  • FTIR spectroscopic study оf S-мetolachlor сorption оn inorganic and organically modified montmorillonite from Bogovina

    Lazar Kaluđerović, Zorica Tomić, Jelena Bogosavljević, Ljubomir Životić, Maja Milošević (2021)
    ... MATERIALS AND ME THODS Materials HDTMA-bromide was obtained from Alfa-Aesar Chemical Company (Karlsruhe, Germany), with a purity of 98%. Phenyltrimethylammonium chloride (PTMA) was supplied by the Tokyo Chemical Industry Company (Toshima, Kita-Ku, Tokyo, Japan), with a purity of 98%. A raw ...
    ... to parent herbicides (Hladik et al., 2006). Montmorillonite is a clay mineral widely used in various industries due to its specific physical and chemical properties, such as cation exchange capacity (CEC), large surface area, high pore volume, high swelling ability, etc. Intercalation of organic complexes ...
    ... pesticides, in: Garnar, R.C., Honeycure, R.C., Higg, H.N., (Eds.), Evaluation of Pesticides in Ground Water. ACS Symposium Series 315, American Chemical Society, Washington, DC, pp. 170—196. El-Nahhal, Y., Nir, S., Polubesova, T., Margulies, L., Rubin, B., 1999. Movement of metolachlor in soil: ...