Претрага

Упит dcterms_subject_txt:Inorganic Chemistry,General Chemistry

550 items

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... by taking the specific digging resistance, k, into account, which entirely depended on the type of soil. Lastly, in 1960, Pajer [13] published the general mathematical Minerals 2021, 11, 564. https://doi.org/10.3390/min11060564 https://www.mdpi.com/journal/minerals minerals Article Cutting Resistance ...
    ... by taking the specific digging resistance, k, into account, which entirely depended on the type of soil. Lastly, in 1960, Pajer [13] published the general mathematical Minerals 2021, 11, 564. https: / /doi.org/10.3390/min11060564 https: / /www.mdpi.com/journal/minerals Minerals 2021, 11, 564 2 of ...

  • Анализа примене утискивања полимера за повећање искоришћења лежишта „Х“

    Јана Ивановић (2024)
    Лежиште „Х“ се налази у Панонском басену и део је нафтно-гасног поља „ХХ“.С обзиром на висок удео воде у произведеном флуиду на лежишту је потребно применити неку методу којом би се смањила брзина напредовања фронта воде ка производним бушотинама, односно смањио удео воде у производњи. Овај рад има за циљ да детаљно испита могућност примене једне од допунских метода повећања искоришћења лежишта, методе утискивања полимера на изабраном лежишту „Х“. Први део рада приказује основне теоријске појмове на којима се ...
    методе повећања искоришћења, хемијске методе, инјектирање полимера, нумеричка симулација
    ... Plans”, 2012. [4] Cai Shuwet, He Xianru, Liu Kun, „Macromolecular interactions and synergy in xanthan/HPAM aqueous solution”, Royal Society of Chemistry, 2017. [5] Chang Hong Gao, „Scienfific research and field applications of polymer Jlooding in heavy oil recovery”, 2011. [6] Dao Saleh Laila ...

  • 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

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... for more complex questions deeper technological knowledge is needed. It may be noticed that edX-BAEKTEL platform is a suitable platform in general but for some specific topics, such as mathematics, additional improvement are needed. 5. TERMI RESOURCES IN EDX-BAEKTEL MATHEMATICAL COURSE ...

  • Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac (2023)
    ... be representative, if it is, by its structure, similar to the basic set [&8]. 199 6. REVIEW OF MASS BLASTING AT THE KOVILOVAČA OPEN PIT 6.1 General characteristics of the Kovilovača open pit Measurements are performed at the mass or stratified limestone |9]. The physical — mechanical chara ...

  • Upotreba lidar tehnologije i digitalne fotogrametrije primenom iPhone pametnih telefona na primeru rudnika "Rudnik"

    Nikola Mirković, Luka Crnogorac, Aleksa Paunović (2024)

  • Failure Estimation of the Majdanpek Open Pit East Face Based on Inverse Velocity Model

    Miloš Marjanović, Stefan Milanović, Nikola Simić, Lazar Kričak (2024)
    The Majdanpek open pit mine south district is currently active mining prospect of copper ore exploitation in eastern Serbia. Its depth is approaching the termination depth and occurrences of large-scale instabilities and global instability of the final pit slope is possible. These can generate catastrophic mass movement inside an area that encloses a regional road route and the Pek River bed which is channelled along the outer contour of the pit. The displacements that were noted in early 2023, in the ...
    displacement, survey, inverse velocity, open pit

  • Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation

    Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer (2021)
    kontinentalna tektonika: kompresija, kontinentalna tektonika: ekstenzija, kontinentalna tektonika: transkurentni i transformni rasedi, pukotine, rasedi, zone snažnih deformacija, kinematika deformacija kore i omotača, teorijska mehanika, modelovanje
    ... vectors dx (the deformed quadrilaterals) is determined by: dx = FdX. First row, incremental deformation, second row, cumulative deformation. 2.4 General deformation described with the deformation gradient Any deformation that can be described by F, can be written as a serial combination of a simple ...
    ... vectors dx (the deformed quadrilaterals) is determined by: dx = FdX. First row, incremental deformation, second row, cumulative deformation. 2.4 General deformation described with the deformation gradient Any deformation that can be described by F, can be written as a serial combination of a simple ...
    ... intensities in the 0.15–99.85 percentiles to the [0 1] intensity range, as the original colours span only a limited part of the intensity range. 5.3 General model evolution Initial deformation Fig. 12 depicts the principal stretches λmax, λmin and our inferred strain type after 7.5 min of model evolution ...

  • Production of morphological dictionaries of multi-word units using a multipurpose tool

    Ranka Stanković, Ivan Obradović, Cvetana Krstev, Duško Vitas (2011)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multi-word units, noun phrases, query expansion
    ... g. can a MWUs have plural forms, can a separator be omitted or replaced by another separator, etc. The basic structure, however, determines the general form of a lemma and information that has to be supplied. Thus, automatic production of the lemma for petokraka zvezda could proceed like this: a ...
    ... is to automatically generate the complete MWU lemma. However, the strategy and the procedure are indepen- dent, and changes in the strategy, in general, do not affect the procedure itself. This approach enabled us to experiment with various rule strategies, and thus the final strategy used is a ...

  • Multi-word Expressions for Abusive Speech Detection in Serbian

    Ranka Stanković, Jelena Mitrović, Danka Jokić, Cvetana Krstev (2020)
    Ovaj rad predstavlja istraživanja na usavršavanju i unapređenju srpske verzije rečnika Hurtlex, višejezičnog leksikona uvredljivih reči. Posebnu pažnju posvećujemo dodavanju izraza sa više reči (polileksemskih jedinica) koji se mogu smatrati uvredljivim, jer su takvi leksički zapisi veoma važni za postizanje dobrih rezultata u mnoštvu zadataka otkrivanja uvredljivog jezika. Srpski morfološki rečnici se koriste kao osnova za čišćenje podataka i stvaranje rečnika. Istaknuta je veza sa drugim leksičkim i semantičkim resursima na srpskom jeziku i predviđena je izgradnja sistema za ...
    uvredljiv govor, govor mržnje, leksički izvori, višejezični leksikon, izrazi sa više reči
    ... adjective expressions. However, none of the dictionary entries were labeled specifically for hate speech and abusive language detection (except with general markers for derogatory or pejorative usage, as mentioned in Subsection 4.1). Our aim was to enrich SrpMD with new MWEs related to abusive language ...
    ... Miljana Mladenović, and Cvetana Krstev. 2015. Adding mwes to serbian lexical resources using crowdsourcing. In poster presented at The 5th PARSEME general meeting. Ias, i, Romania, pages 23–24. Jelena Mitrovic, Cliff O’Reilly, Randy Allen Harris, and Michael Granitzer. 2020. Cognitive modeling in compu- ...

  • Old or New, We Repair, Adjust and Alter (Texts)

    Cvetana Krstev, Ranka Stanković (2020)
    U ovom radu predstavljamo kako se e-rečnici i kaskade transduktora konačnih stanja implementirani u alatu Unitex mogu koristiti za rešavanje tri problema transformacije teksta: ispravljanje tekstova nakon OCR-a, vraćanje dijakritičkih znakova i prebacivanje između različitih jezičkih varijanti.
    ispravka teksta, OCR greške, restauracija dijakritika , jezičke varijante, elektronski rečnik, transduktori konačnih stanja
    ... Scientific paper 2. All words not detected by dictionaries are marked as potential results of OCR errors; 3. In these words one or two letters (in general, characters) that were identified as prone to false recognition are replaced with other letter(s) thus generating candidate words. This process is ...
    ... three letters ‘и’ occur, first and second are incorrect and should both be replaced by ‘н’ yielding a valid word снежни – snežni ‘snowy’. Just a few general FSTs (bottom of Figure 2) were developed for a few types of corrections – one or two character replacement, in one or both directions. Specific FSTs ...

  • Mesozoic carbonate rocks in Serbia used as dimension stone

    Vesna Matović, Tijana Vojnović Ćalić (2016)
    The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...
    Ukrasni kamen, Mezozoik, Krečnjak, Srbija, Petrografija, Fizičko-mehanička svojstva
    ... 1-5 mm. Laminas consist of algal masses with the frequent occurrence of densely glued, grape-shaped accumulations of micrite and intraclasts. A general char- acteristic of the biolithite is its fenestral texture, which is characterised by irregular or lenticular voids that are completely filled ...
    ... limestones (dolomitization is not observed). These limestones consist small amounts of isoluble residue (clay minerals and Fe-oxide/hydroxide). In general, the local appearance of clayey limestone, marly limestone, and marlstone in the form of very thin interlayers (observed in Struganik and rarely ...

  • Formative evaluation of e-learning projects with the logical framework approach

    Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković (2015)
    ... difficulty of assessing the genuine and effective economic and social returns. This issue involves the E-Learning sector, as many others. In general, and as a first approximation, evaluate means to give, recognize, a value in formal, clear and methodologically rigorous way, to a subject (evaluand) ...

  • Serbian Society of Geomorphologists

    Dragana Đurić, Jelena Ćalić (2019)

  • Palaeoflora of Kamenica (Pranjani Basin, western Serbia)

    Zorica Lazarević, Ljubica Milovanović, Jelena Milivojević, Ivana Vasiljević (2019)
    Palaeofloras of the Paleogene in Serbia are relatively rare, especially in comparison with floras from Neogene sediments. Most Paleogene phytoas sociations from the territory of Serbia existed in a dry and warm climate. The youngest Paleogene phytoassociation originates from the Pranjani Basin (Western Serbia), locality Kamenica. The age of this palaeoflora is determined as Late Oligocene. This fossil plant assemblage is different from other Paleo gene phytoassociations.The palaeoflora from Kamenica is characterized with leaf imprints larger than in other ...
    макрофлора, млађи олигоцен, Прањански басен, Каменица
    ... surrounding rocks. In the pre- sented study area (Fig. 2), the position of Neogene basins mostly coincides with low gravity values, but it is not a general case. Gravity anomalies are strongly influenced by the complex configuration of the basin basements and surrounding geology, im- plying a relatively ...

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... reference ecosystems [6-8]. 2. REQUIREMENTS OF LAND RECULTIVA TION This paper is part of research applied to the coal open pit Drmno, which has as general objectives as impact of mining in the area, as well as ecological conversion solutions for coal open pit Drmno (one of the open pits of Kostolac ...

  • Split-Desktop software for the analysis of fragment size distribution of blasted rock mass

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)
    Drobljenje stena je najvažniji pokazatelj u proceni efekata miniranja pri proizvodnom miniranju u površinskoj eksploataciji. Stepen drobljenja stena ima veliki uticaj na efikasnost daljih operacija utovara, transporta, drobljenja i mlevenja. Optimalno drobljenje stena pri proizvodnom miniranju utiče na smanjenje ukupnih troškova proizvodnje. Stoga je pouzdana procena veličine drobljenja odminirane stenske mase veoma važno pitanje, ne samo u operacijama miniranja, već i u rudarskoj proizvodnji. Za predviđanje distribucije veličine komada odminirane stenske mase postoje različiti empirijski modeli. KUZ-RAM model omogućava ...
    Split-Desktop softver, drobljenje stena, miniranje, analiza, digitalna obrada fotografija

  • Geotechnical conditions of “Debelo brdo” tunnel construction on the highway E-80: Nis-Merdare-Pristina (“Peace Highway”)

    Dragoslav Rakić, Irena Basarić Ikodinović, Radojica Lapčević, Dragan Lukić (2024)
    The construction of the highway E-80 has begun in Serbia, which will represent the traffic hub of the Western Balkans and will be part of the main regional transport network of Southeast Europe. Its total length through Serbia is 77 km, and one part of the route is designed through a typical plain terrain, while a larger part of the route passes through hilly terrain. The construction of the tunnel “Debelo brdo” is planned partly in an open cut ...
    „Debelo brdo“ tunnel, temporary slopes, open cut excavation, tunnel excavation, piles

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... geological constraints, policies and mining methods. Secondly, the quantity re- quirements must ensure sufficient coal produc- tion. This model, in general, is based on predicted information about the in-situ quality of the coal deposit. Consequently, production scheduling for the purpose of controlling ...
    ... intersections is even, then the value of the func- tion is 0, and if it is odd, the value of the function is 1. By plugging this function in the general formula for Monte Carlo integration, one can approximate the area of the polygon. In order to calculate the intersection of the polygons P1, P2, ...

  • Analiza softvera za projektovanje ESP sistema

    Aleksandar Sredojević (2024)
    U momentu kada pritisak na dnu bušotine nije dovoljan da savlada ukupne gubitke pritisaka od dna bušotine do separatora, proizvodnja pomoću ležišne energije nije više moguća i bušotina prestaje sa eruptivnim radom. Kako bi ponovo omogućili proizvodnju fluida iz bušotine, potrebno je primeniti neke od mehaničkih metoda eksploatacije. Najprimenljivije mehaničke metode eksploatacije su: gas lift (GL), dubinske pumpe sa klipnim šipkama (SRP), električne uronjene centrifugalne pumpe (ESP), zavojne pumpe (PCP) i hidraulične pumpe (HP). Jadna od tih metoda koja ...
    električna centrifugalna pumpa (ESP), proizvodnja fluida, mehaničke metode eksploatacije, Prosper, Pipesim
    ... Pipesimu jeste unos paramtara vezanih za dimenziju bušotine i proizvodne oprem, odnosno dimenzije tubinga i kezinga. To Je prikazano na slici 6-10. General | Deviation survey | Heat transfer Dimension option: (*) OD “) CASINGS/LINERS ) Wall thickness Section type Name From MD “4 m 1 |Casing ...
    ... Ovaj postupak prikazan je na slici 6-14, gde J levo prikazana kriva performansi pumpe. Takođe se izabere odgovarajući elektromotor. 69 'General | Deviation survey [ Heat transfer | Tubulars_| Downhols equipment | Airciai tft | Completicns | Surface equipment | CALCULATIONOPTIONS REFERENCE ...
    ... softver bira najpovoljniju koreelaciju koja se poklapa sa unesenim podacima. Taj prozor je prikazan na slici ck Sk CHOKE Name: k Active: [7] General | Advanced Sub-critical correlation:| Mechanistic ~ Critical correlation: Mechanistic ~ e AII correlations require hydrocarbon liquids at stock ...