Претрага

Упит dcterms_subject_txt:groundwater source.0

4920 items

  • Mikroelementi u uljnim šejlovima Aleksinca i njihov uticaj na životnu sredinu

    Nikoleta Aleksić (2021)
    ... Dalmacija“, 2021. V-05 0 20 40 60 80 100 0,0 0,2 0,4 0,6 0,8 1,0 0 20 40 60 80 100 0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 0 20 40 60 80 100 0,0 0,2 0,4 0,6 0,8 1,0 HTCR_220 C e /C 0 t (h) HTCR_200 C e /C 0 t (h) HTCR_180 C e /C 0 t (h) Slika 2. Kinetika ...
    ... vodeni rastvori pravljeni sa dejonizovanom vodom specifičnog otpora 18 МΩ·cm. Koncentracije reaktanata u sistemu bile su: [KIO3]0 = 0,046 mol/dm3, [H2SO4]0 = 0,075 mol/dm3 i [H2O2]0 = 0,196 mol/dm3. Koncentracije pirokatehola u sistemu bile su: 2,5·10-5 mol/dm3, 1,5·10-4 mol/dm3 i 1·10-3 mol/dm3. Pirokatehol ...
    ... 500 s od početka oscilatorne reakcije b), c), d). Oscilogrami su dobijeni pri sledećim eksperimentalnim uslovima [KIO3]0 = 0,046 mol/dm3, [H2SO4]0 = 0,075 mol/dm3 i [H2O2]0 = 0,196 mol/dm3, T=65,0°C, u ukupnoj zapremini od 3 ml Održivi razvoj VIII Memorijalni naučni skup iz zaštite životne ...

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... CI 0 CI 0 CR 0 CR 0 Towing Force (TF) Undercarriage Type (UT) T1 T2 T3 T4 Weight T1 T2 T3 T4 Weight T1 1 3 2 1 0.351 T1 1 2 2 2 0.400 T2 1/3 1 1 2 1/3 0.109 T2 1 2 1 1 1 0.200 T3 1 2 2 1 1 2 0.189 T3 1 2 1 1 1 0.200 T4 1 3 2 1 0.351 T4 1 2 1 1 1 0.200 λmax 4.00292 λmax 4 CI 0.00097 CI 0 CR 0 ...
    ... CR 0.01124 CR 0.00308 Human Resource Costs (HR) T1 T2 T3 T4 Weight T1 1 1 1 1 0.250 T2 1 1 1 1 0.250 T3 1 1 1 1 0.250 T4 1 1 1 1 0.250 λmax 4 CI 0 CR 0 Energies 2019, 12, 2245 10 of 16 Table 9. Ranking by economic criteria. Alternative Weight Coefficient of Alternatives for Criteria EcP Rank ...
    ... 492 T2 1 1 4 4 0.400 T3 1 4 1/5 1 1/2 0.078 T3 1 4 1/4 1 1 0.100 T4 1/3 1/4 2 1 0.125 T4 1 4 1/4 1 1 0.100 λmax 4.03218 λmax 4 CI 0.01073 CI 0 CR 0.01205 CR 0 Table 12. Ranking by exploitation criteria. Alternative Weight Coefficient of Alternatives for Criteria ExP Rank T1 0.250 · 0.467+ 0.250 · ...

  • Demise of the Wetterstein Carbonate Platform and onset of the Dachstein Carbonate Platform recorded in deep-water successions of the East Bosnian-Durmitor megaunit (Pliješevina, northern Montenegro, Dinarides)

    Milica Mrdak, Eva Wagerer, Milan Sudar, Nevenka Djerić, Martin Đaković, Hans-Jürgen Gawlick (2024)
    Triassic, Carnica event, clay mineralogy, conodont biostratigraphy, Neo-Tethys

  • Analiza primenjenih metoda za transport parafinske nafte

    Dunja Milojević (2024)
    Sadržaj parafina u nafti ima dominantan uticaj na svojstva parafinskih nafti. Taloženje parafina, odnosno taloženje čvrstih čestica parafinskog voska, predstavlja ozbiljan globalni problem tokom proizvodnje i transporta sirove nafte. Samo taloženje voska zavisi od termodinamičkih faktora, poput temperature, pritiska i sastava nafte. Transport nafte cevovodima je uobičajeni proces transporta u naftnoj industriji. Kada prilikom cevovodnog transporta parafinske sirove nafte, dođe do prekida protoka i hlađenja nafte ispod temperature stinjavanja, parafini će kristalisati, pri čemu će doći do, geliranja celokupne transportovane ...
    nafta, parafinski vosak, taloženje, transport, naftovod
    ... parafinskih naft.. U ovakvim slučajevima maksimalna deonica koja zahteva napajanje jednim izvorom struje Je 15 km. (Prstojević, 2012) power source Slika 6.6 — Prikaz strukture sistema zagrevanja naftovoda SECT Na slici 6.6, Je šematski prikazan cevovod gde su naftovod, električni kabl i ...
    ... gradijent pritiska, u odnosu na veličinu protoka na različitim temperaturama. Primer mešanja nafte „Alđe“ sa prirodnim kondenzatom na temperaturi od 0 do 15 *C. U tom slučaju sirova nafta kao i mešavine su pseudoplastični fluidi. Zbog dodavanja kondenzata gubici usled trenja se smanjuju. Stepen redukcije ...
    ... Jlo3BoJbaBaM a ce OOjaBe MOjH JHduHH IOlAl Be3aHH 3a NOOHjaM»c aKa)leMCKOT 3BaM»a, KaO IITO Cy HMe H HIipe3HMe, rojiHHa H Mecro poljema H naTyM 0/IGpaHe pa/la. OBH HuHH HOJaLH MOTy CC OGjaBHTH y ecHeKTpOHCKOM KaTaory H y nyOnHKalHjaMa Pyaapcko-reonomiKor (bakyTeTa. 'V Beorpany, IIornuc crynenrTa ...

  • Pleistocene rhinoceros from Bogovina Cave: the first report of Stephanorhinus hundsheimensis Toula, 1902 (Mammalia, Rhinocerotidae) from Serbia

    Predrag Radović, Miloš Radonjić, Emmanuel Billia (2020)
    Finds of Pleistocene rhinoceros are rare in Serbia, and only one species (the woolly rhinoceros Coelodonta antiquitatis Blumenbach, 1799) has been reported so far. The current paper presents the dental material of an extinct so-called Hundsheim rhinoceros, Stephanorhinus hundsheimensis Toula, 1902 from Bogovina Cave (East ern Serbia). Both the morphological and metric characteristics of the teeth are consis tent with the attribution to S. hundsheimensis. Unfortunately, the rhinoceros material originated from an uncertain geological context, so there is no ...
    rhinoceros, Stephanorhinus hundsheimensis, Serbia
    ... Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. creativecommons.org/licenses/by/4.0 Pleistocene rhinoceros from Bogovina Cave: The first report of Stephanorhinus hundsheimensis Toula ...

  • Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach

    Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)
    Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...
    pyrazoloquinolinones, nanocrystals, wet media milling, fasted/fed bioavailability
    ... 1188 5 of 19 in parafocusing Bragg–Brentano geometry. The used detector was D/teX Ultra 250 strip detector in 1D standard mode with CuKα1,2 radiation source (U = 40 kV and I = 30 mA). The 2θ range in which the results were collected was from 3◦ to 40◦, with the step of 0.01◦ (data collection speed was ...

  • Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study

    Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2023)
    Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms ...
    Pharmaceutical Science
    ... diffraction (XRPD). The analysis was performed on a Rigaku Smartlab X-ray diffractometer in a 0-0 geometry using the D/teX Ultra 250 strip detector in 1D standard mode with a CuKou „ radiation source (U=40 kV and I=30 mA). Data were acquired in a 20 range of 3-40% using a low background single ...
    ... AH = 126.15 J/g | . L || - l L || L : ıj 0 50 100 150 200 Temperature (*C) 'European Journal of Pharmaceutical Sciences 189 (2023) 106557 < o [1 10 15 20 25 3 3 4” 45 1444 G I . I . I . I I I i. S+M 1+1 In te ns it y (a .u .) ~ Š o [0 -} [ 20 25 30 35 40 45 2 theta (?*) Fig ...
    ... Mitrović et al. a) 0 50 100 150 200 T T T T+M 3+2. -0.32 -0.64 -0.96 T_ .Z 138.06 "C peak -1.28 AH = 58.46 J/g -0.47 -0.94 T,= 31.38*C -1.41 T... — 152.60 C -1.88 peak AH = 78.06 J/g He at Fl ow (a .u .) , en do do wn -0.55 -0.66 -0.77 -0.88 0 50 100 150 200 ...

  • Structural and geochronological constraints from the Drina-Ivanjica thrust sheet (Western Serbia): implications for the Cretaceous–Paleogene tectonics of the Internal Dinarides

    Kristof Porkoláb, Szilvia Kövér, Zsolt Benkó, Gabor Héja, Melinda Fialowski, Balázs Soós, Nataša Gerzina Spajić, Nevenka Đerić, László Fodor (2019)
    Internal Dinarides, Drina-Ivanjica thrust sheet, Deformation history, K–Ar dating, Obduction, Structural analysis
    ... extension —= D3strike-slip fault —— projeclion of fault plani m projection of fault pole “2|Rup:27+11/0!!,D! Bng:10 B/01,,1 Phi:0,607. 2j Rup:39+10/0!!.21 -J fng:03 ol0li,2! Phi:0:720 IB westem-Vardar ophiolite- —— D4 normal fault Sub-ophiolitic melange - Southern Triassic TsT „ Southem ...
    ... permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes Wwere made. References Abad, I. (2007). Physical meaning and applications ...
    ... Southem Triassic T, |D Northem Triassic T,-T, [B2 Dina-Ivanjica Paleozoic D4 orogen-parallel extension D3 strike-slip regime up:31320/0! |Ang:161 14 JPhi: 0,456 • Požega || 7 10km The coordinates are in Gauss-Kruger pmš'eclion system Zone 7, Croatian/Serbian Datum| fRup:27x 14701 ...

  • Multiple-Criteria Decision-Making in Mine Development Planning

    Sanja Bajić (2023)
    The Borska Reka ore deposit is an experimental location where developed methodologies have been applied. It is the largest ore body within the Bor mining complex, which has been the subject of numerous studies and analyses for more than three decades. The paper focuses on the application of FAHP and the VIKOR method to address ranking of alternatives and select the optimal mining method by means of fuzzy multicriteria optimization.

  • Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike

    Мирослав Црногорац, Душан Даниловић, Лола Томић (2020)
    ... data table 1 [4]. Table 1: One estimate of global water distribution Water source Water volume, in km3 Fresh water Total water Oceans& Seas 1,338,000,000 — 96.5 Ice caps & Snow 24,064,000 68.7 1.74 Groundwater 23,400,000 — 1.7 Fresh 10,530,000 30.1 0.76 Saline 12,870,000 — 0.94 ...
    ... Ocena 1 2 3 4 5 6 7 8 9 10 Broj pojavljivanja X 1 / 1 7 5 7 14 17 10 9 Frekvencija X/72 0 ,0 1 4 / 0 ,0 1 4 0 ,0 9 7 0 ,0 6 9 0 ,0 9 7 0 ,1 9 4 0 ,2 3 6 0 ,1 3 9 0 ,1 2 5 Integralni WLBW koeficijent, to jest pokrivena površina, je:  50,53)( 8 1 8 ...
    ... PIM9 229 2. GROUNDWATER, IMPORTANCE AND PROBLEMS Groundwater plays a major role in water supply, the functioning of the ecosystem and the well-being of people. Around 2.5 billion individuals worldwide rely exclusively on groundwater to meet their fundamental daily requirements ...

  • Hidrogeohemija prirodnih radioaktivnih elemenata u podzemnim vodama Srbije

    Marina D. Ćuk (2018-02-23)
    Osnovni cilj doktorske disertacije predstavljao je definisanje prirodnih koncentracija (engl. background values) U, Th, i K u podzemnim vodama, i definisanje hidrogeohemijskih uslova koji utiču na distribuciju navedenih elemenata u podzemnim vodama...
    prirodni radioaktivni elementi, podzemna voda, geohemijske sredine, hidrogeohemijski uslovi, neparametarska statistička analiza, logistički model, hidrohemijsko modeliranje
    ... data in studying regional groundwater flow systems in the Great Hungarian Plain. Procedia Earth and Planetary Science 13: 177 – 180. 154. Tesoriero AJ, Inkpen EL, Voss FD. 1998. Assessing ground-water vulnerability using logistic regression. Proceedings for the Source Water Assessment and Protection ...
    ... THE GROUNDWATER OF SERBIA ABSTRACT The primary objective of this PhD thesis was to determine background concentrations of natural radionuclides (U, Th, and K) in the groundwater, and to establish hydrogeochemical conditions affecting the distribution of these elements in groundwater. The ...
    ... ER. 2004. Groundwater vulnerability to nitrate contamination in the Mid-Atlantic region. USGS, Baltimore. 52. Griffioen J, Kruseman JP. 2004. Determining hydrodynamic and contaminant transfer parameters of groundwater flow. In: Kovalevsky VS, Kruseman GP, Rushton KR (eds.). Groundwater Studies ...

  • Prostorni položaj ofiolita istočne Vardarske zone: geofizičko-geološki model i njegove geodinamičke implikacije

    Dragana D. Petrović (2015-12-29)
    Centralni deo Balkanskog poluostrva je geotektonski veoma složen. Tetis je zatvorentokom gornjeg mezozoika, a ofioliti na zapadu i ofioliti Vardarske zone predstavljajuostatke nekadašnjih okeanskih prostora. Najistočniji deo Vardarske zone razlikuje se odsvih ostalih ofiolita na Balkanskom poluostrvu i karakteriše se najizraženijim suprasubdukcijskimafinitetom. Istočna vardarska zona locirana je u centralom delu Srbije.Na severu se prostire do Apusena u Rumuniji, a na jugu obuhvata cetralni deoMakedonije i Peonias zonu u severnoj Grčkoj. Istočna vardarska zona se nalazi istočnood geotektonske jedinice Kopaonik ...
    Istočna vardarska zona; ofioliti; 2D i pseudo 3D geofizičko-geološkimodel; geodinamička evolucija
    ... and Ugalde, 2007). Totalna magnetizacija predstavlja zbir indukovane magnetizacije (D=0°, I=75° i In=55000 nT) i hipotetičke remanetne magnetizacije (D=90°, I=-15°). Kenigsbergov odnos postepeno se povećava od 0 do 100. Promenom vrednosti Kenigsbergovog odnosa, izgled anomalije se sistematski menja ...
    ... to determine the position of rocks masses that caused the anomalies. The pattern of geomagnetic anomalies depend not only form dip angle of the source of the anomaly, but of remanent magnetization, as well. Due to this reason laboratory measurements were done along determinations of density, su ...
    ... , Foley, S., Romer, R. L., Cvetković, V., Downes, H., 2005. Tertiary ultrapotassic volcanism in Serbia: constraints on petrogenesis and mantle source characteristics. Journal of Petrology 46, 7, 1443–1487, doi: http://doi.org/10.1093/petrology/egi022. Prelević, D. and Foley, S. F., 2007. Accretion ...

  • Named Entity Recognition for Distant Reading in ELTeC

    Francesca Frontini, Carmen Brando, Joanna Byszuk, Ioana Galleron, Diana Santos, Ranka Stanković (2020)
    Akcija COST „Udaljeno čitanje za evropsku književnu istoriju“, koja je počela 2017. godine, ima među svojim glavnim ciljevima stvaranje višejezične zbirke evropskih književnih tekstova (ELTeC) otvorenog koda. U ovom radu predstavljamo rad koji je obavljen na ručnom označavanju selekcije ELTeC kolekcije za imenovane entitete, kao i na proceni postojećih alata za prepoznavanje imenovanih entiteta u pogledu njihove sposobnosti da automatski urade takve anotacije. U poslednjem paragrafu se razmatraju zajedničke tačke između ove inicijative i CLARIN-a.
    ... 1 5 7 5 7 3 9 6 0 .2 8 4 0 .7 3 4 0 .7 1 6 P E R S 5 6 9 2 3 6 3 9 3 0 .5 9 1 0 .7 0 7 0 .4 0 9 S ta n f o r d - e n g L O C 9 8 1 0 0 1 2 6 0 .4 3 8 0 .4 9 5 0 .5 6 3 P E R S 6 4 9 5 3 5 3 9 9 0 .6 1 9 0 .5 4 8 0 .3 8 1 S P A C Y -e n g L O C 9 8 1 0 0 1 7 0 0 .3 6 6 0 .4 9 5 0 .6 3 4 P E R S 5 ...
    ... 5 3 6 6 4 8 2 4 0 0 .6 9 1 0 .4 5 3 0 .3 0 9 S r p N E R - s r p L O C 1 0 7 7 8 19 0 .8 4 9 0 .5 7 8 0 .1 5 1 P E R S 7 1 8 2 6 7 1 5 8 0 .8 2 0 0 .7 2 9 0 .1 8 0 S P A C Y -s rp L O C 5 7 1 2 8 1 0 4 0 .3 5 4 0 .3 0 8 0 .6 4 6 P E R S 5 5 3 4 3 2 3 1 5 0 .6 3 7 0 .5 6 1 0 .3 6 3 T a b le 2: R ...
    ... 0 .9 0 5 0 .9 0 1 0 .0 9 5 S P A C Y -p o r1 L O C 2 2 5 8 4 4 4 0 0 .3 3 8 0 .7 2 8 0 .6 6 2 P E R S 4 6 5 2 5 6 3 7 4 0 .5 5 4 0 .6 4 5 0 .4 4 6 P A L A V R A S -p o r 2 L O C 1 51 6 7 9 1 0 .6 2 4 0 .6 9 3 0 .3 7 6 P E R S 8 5 7 1 3 3 2 8 5 0 .7 5 0 0 .8 6 6 0 .2 5 0 S P A C Y -p o r2 L O C 1 ...

  • Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules

    Svetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón (2024)
    The stability analysis of homogeneous rock slope following the Hoek–Brown failure criterion under the hypothesis of different flow rules is performed based on limit equilibrium and finite element methods. The applied failure criterion is the generalized Hoek–Brown that can be introduced as a shear/normal function in analysis applying different flow rules. The results are compared with those obtained by the application of equivalent shear strength parameters of the Mohr–Coulomb criterion, considering that this is still the most widely used ...
    Kružna klizna površ, Huk-Braunov kriterijum loma, Kriterijum popuštanja, Smičuća/normalna funkcija, Nivo napona, Verovatnoća i parametarska analiza

  • 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
    ... 31/82” and “Službeni list SRJ 42/98”; ** Target values and soil remediation intervention values and background concentrations soil/sediment and groundwater for metals. Dutch Target and Intervention Values, 2000 (the New Dutch List). Table 6. The concentrations of heavy metal cations in tailings wastewater ...
    ... 31/82” and “Službeni list SRJ 42/98”; ** Target values and soil remediation intervention values and background concentrations soil/sediment and groundwater for metals. Dutch Target and Intervention Values, 2000 (the New Dutch List). After treatment of wastewater (Ce) with AC@F–750–N2–1.0–KOH and AC ...
    ... x-ray powder diffraction (XRPD) analysis using Ultima IV Rigaku diffractometer (Rigaku, The Woodlands, TX, USA), equipped with Cu Kα 1,2 radiation source (a generator voltage of 40.0 kV and a generator current of 40.0 mA). All samples were recorded in the range of 10–90◦ 2θ, with a scanning step of 0 ...

  • Polyhedral characteristics of the cosalite-type crystal structures

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)
    kristalna struktura, kozalit, poliedarske karakteristike

  • Threshold-induced correlations in the Random Field Ising Model

    Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević (2018)
    Multidisciplinary
    ... w w,0 Tw , speci�ed by the value τ = . ± .1 64 0 02Tw for the exponent of the waiting time, and terminated by the cuto� scaling function gw(x), taken for Tw/Tw,0, where Tw,0 is the cuto� waiting time. In contrast to the cuto� time T0 which decreases with threshold, the cuto� waiting time Tw,0 increases ...
    ... duration, and τs = 1.38 ± 0.03 for size of subavalanches. �ese values are obtained using − ∝ − σg T T T T( / ) exp[ ( / ) ] T 0 0 T , and − ∝ − σg S S S S( / ) exp[ ( / ) ] S 0 0 S , where σT and σS are the cuto� exponents whose values are close to 1 for all the distributions being analysed. �e average ...
    ... Inset shows how γS T/ (0) (i.e. the exponent γS/T taken for Vth = 0) depends on the reduced disorder r. www.nature.com/scientificreports/ a b -6 7 Vat ~~ Vi. =20 Vi, =100 400 T 10 {n= 10 —¥— V,,=30 —*— V,,=200 { ext ir V,,=40 —*— V,,,=300 T ., T. | Pint i084 => Ss end mid ini 0 — Vi, =50 —e— Vy, =400 ...

  • Процена ризика од загађивања водних ресурса под утицајем напуштених рударских радова на простору Србије

    Nebojša B. Atanacković (2018-08-31)
    Велики број напуштених рударских радова и ограничена средства за рекултивацијуи ремедијацију деградираних простора подстакле су развој метода за издвајањеприоритетних локација на које је потребно усмерити даља истраживања. У датомконтексту, у склопу израде дисертације спроведене су научно-истраживачкеактивности које су за предмет имале анализу утицаја значајнијих напуштенихрударских радова на водне ресурсе на простору Србије јужно од Саве и Дунава.Разматрање предметне проблематике извршено је кроз развој и примену семи-квантитативне методологије за анализу ризика од загађивања површинских иподземних вода на регионалној размери. Примењена ...
    анализа ризика, водни ресурси, водна тела, рудничке воде, рударскиотпад, аналитички хијерархијски процеси, кластер анализа, математичка теоријаатрибута, функције припадности, семи-квантитативне методе
    ... 0 0 0 0 0 0 27 1 1 0 1 0,731 0 0 0,12 0 0,032 0 0 0,88 0 0,237 0 0 0 0 0 28 1 0 1 1 0,583 0 0,537 0 0 0,224 0 0,463 0 0 0,193 0 0 0 0 0 29 1 0,37 0 0,5 0,408 0 0,63 0 0,5 0,323 0 0 0 0 0 0 0 1 0 0,269 30 1 0,301 1 0 0,587 0 0,699 0 1 0,413 0 0 0 0 0 0 0 0 0 0 31 1 0,677 1 0,857 0,848 0 0,323 0 0 ...
    ... 292 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 1 0,121 0,713 0,985 0 0 0,548 0,287 0,015 1 0 0,331 7 0 0 0 0 0 0 1 0 1 0,538 0,477 0 0,5 0 0,227 0,523 0 0,5 0 0,235 8 0,440 0 1 1 0,475 0,56 0,678 0 0 0,391 0 0,322 0 0 0,134 0 0 0 0 0 9 0,440 0 1 1 0,475 0,56 0,678 0 0 0,391 0 0,322 0 0 0,134 0 0 0 0 0 ...
    ... 268 0 0,257 0,143 0 0 0 0 0 0 0 0 0 0 19 1 0,015 1 0,743 0,558 0 0,985 0 0,257 0,442 0 0 0 0 0 0 0 0 0 0 20 0 1 0 0 0,417 1 0 0 0 0,193 0 0 1 0,17 0,29 0 0 0 0,83 0,1 21 0 0,761 1 0,321 0,625 0,637 0,239 0 0,679 0,305 0,363 0 0 0 0,07 0 0 0 0 0 22 0,886 1 1 0,071 0,866 0,114 0 0 0,929 0,134 0 0 0 0 ...

  • 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
    ... (11), was used. The result is shown in Figure 6.5. p(k) = |a(k)| (2) 53 10 40 5 08 % 06 5 --- N_ 20 04 — 5 0 02 5 00 0 T T T T T T LI 00 02 04 06 08 10 0 20 40 60 [I 100 Figure 6.5. Application of the Fourier Transform to a normalized dynamometric chart Jrom a well using equations ...
    ... s s a) š 2000 0 5 10 15 20 25 30 b) š -4000 WAAWF@@JW{ 6000 -8000 Polished rod position (in} Polished rod position (in} Rotaded card Rotaded card Surface card Dovwnhole card Surface card Downhole card c) Lo ad (I b} o — Lo ad (Ib} ) [-] 8 Š } [[ (3} 0 30 40 50. Polished ...
    ... good result compared to other studies. Group C ” 96315 [1 “ 0.9462 ' | s| ~ Founer -- [ B; MAccuracy MFIMacro w MCC || 095383 09452 0%08 0\940 090257 0902 i 09 08613 03017 079673 [1] 073832 . o |' i a xs | 04 03 [1 Founet avele ı D Nel 086137 Wavel Loxds + Xgh Fo ...