Претрага

Упит dcterms_subject_txt:Проблем p-центра

854 items

  • Analysis of the exhaust emissions inventory from auxiliary mining machines

    Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)
    Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...
    emissions, mining, auxiliary machines

  • Using gravity data to define structural correlation affecting the formation of Neogene basins

    Snežana Ignjatović, Ivana Vasiljević, Branisav Sretković, Milanka Negovanović (2023)
    A gravity survey can help to define the structural correlation in the study area. The structures that have influenced the development of Neogene basins can be defined using gravity data. By applying mathematical transformations to gravity data, the geological structures (faults, nappes, etc.) that impacted the formation of Neogene basins can be defined. We have taken the part of the Dinarides as the test region. The paper presents the results obtained using the procedure residual, vertical gradient, and total ...
    gravity survey, mathematical transformation, basin

  • 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
    ... Berane Basin (Lower Miocene). Geološki anali Balkanskoga poluostrva, 79 (2): 41–55. ereMIja, M., PavLOvIć, M.B. & STevaNOvIć, P. 1977.Pranjanski basen. In: STevaNOvIć, P. (ed.). Geologija Srbije. Keno- zoik II-3. Institut za regionalnu geologiju i paleontolo - giju, rudarsko-geološki fakultet, Beograd ...
    ... 199–321. PaNTIć, M. & PavLOvIć, M.B. 1977. Bogovinski basen. In: STevaNOvIć, P. (ed.). Geologija Srbije. Kenozoik II-3. In- stitut za regionalnu geologiju i paleontologiju, rudar - sko-geološkifakultet, Beograd, 93–96. radOvIć, P. & BradIć-MILINKOvIć, K. 2018. a new elephan- toid dental specimen from ...
    ... New Phytologist, 166: 465–484. Palaeoflora of Kamenica (Pranjani Basin, western Serbia) Geol. an. Balk. poluos., 2019, 80 (2), 53–63 57 WILF, P. 1997. When are leaves good thermometers? a new case for Leaf Margin analysis. Paleobiology, 23 (3): 373–390. WOLF, j. 1971. Tertiary climatic Fluctations ...

  • Primena termografije u rudarstvu

    Stevan Đenadić, Vesna Damnjanović, Predrag Jovančić, Dragan Ignjatović, Dragutin Jovković, Filip Miletić (2019)
    Danas, gotovo da nema oblasti u nauci i tehnici u kojoj se Infracrvena termografija ne primenjuje kao metoda za lociranje i praćenje zagrejanih objekata ili tela, beskontaktnu procenu temperature površina, i nedestruktivno ispitivanje materijala. U radu su prikazane mogućnosti i perspektive primene ove metode u oblasti rudarstva.
    infracrvena termografija, rudarstvo, monitoring
    ... (Slika 3). U slučaju identifikovanja problema na osnovu snimljenih termograma, brzom reakcijom moguće je sprečavanje prekida napajanja električnom energijom rudnika koji bi generisao gubitke u svakodnevnoj proizvodnji. U proseku, za rešavanje ovakvih problema potrebno je 4 do 6 h, što na kopu srednje ...
    ... nekoliko 104 t. U slučaju blagovremenog otkivanja greške ICT metodom, isti problem može rešiti za manje od 1 h. Nakon sprovedenih mera održavanja opreme, stručnjaci snimaju nove termograme kako bi se uverili da je problem otklonjen. U zavisnosti od potrebe ovakva inspekcija može se vršiti različitom ...
    ... kompanijama pokazuje da se o termografiji ne zna mnogo, izuzev da se njenim korišćenjem mogu detektovati mehaničke i električne komponente koje imaju problem sa pregrevanjem [9], i blagovremeno predvideti potencijalno samozapaljenje uglja [10-13]. U datom radu predstavljene su mogućnosti i perspektive ...

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer

    Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)
    ... y acluifer system of Hungary-Serbia was preliminary separated into two parts: one large GW body in Serbia named CS-DU 10, and five in Hungary (P.1. and P.2. groups). The totai area is assumed to cover around 27 0OA1
    ... UN/ECE, LelYstad, Netherlands. ISBN 903695 31 54. 2 Pui, S., APPelgren, 8., Arnold, G., Aureli, A., Burchi, S., Burke, |., Margat, J. and Pallas, P. (2001) Internationally Shared (Tiansboundary) Aquifer Resources Management: Their Significance and Sustainable Management. A Framework Document, ...
    ... visszatartlsi leheto s6gek, MHT XXIV' Orszdgos Vdndglu l6s ICadvdnya. P6cs. g Stevanovi6, Z.,Lazil M., Polomci6, D., Milanovid, S., Haidin, B', PaPi6, P., Sorajii, S. and l{jaji6, Z' (2008) Sustainable DeveloPment of Hungarian-S erbian Transboundary Aquifer (SUDEHSTRA), Finai Report, Fac. Min. Geol ...

  • Оцена перспективности изворишта "Вић баре" за водоснабдевање Обреновца

    Бојан Хајдин, Душан Поломчић, Зоран Стевановић, Драгољуб Бајић, Катарина Хајдин (2012)
    ... nepovoljne hidroloske situacije u proteklom periodu (sl. 2) ali i problema ubrzanog 108 Slika 2. - - Figure 2. Comparative diag - - - Slika 3. - - Figure 3. - - - - P-3 P-4 P-8 Slika 4 - Figure 4. - Ocena perspektivnosti izvorista ...
    ... proseéno 260 I/s vode. Problemi na izvoristu javijaju se zbog specifiénih prirodnih uslova sredine sa poviSenim koncentracijama gvozda i mangana U vodi, ali i sve izrazenijih perioda susa sa_niskim vodostajima Save koja je osnovni izvor prihranjivanja izdani. Znacajne probleme u vodosnabdevanju stvaraju ...
    ... hidrogeoloSke problematike i realniju procenu perspektivnosti ovog izvorista. JKP “Vodovod i kanalizacija” u poslednjoj deceniji rada suocava se sa problemom smanjenja kapaciteta izvorista i obezbedenja eksploatacije na dosadaSnjem nivou. U radu su analizirani uzroci ovakvog stanja i prikazana moguéa reSenja ...

  • Depth estimation of archeological objects using Euler 3D deconvolution of magnetic data

    Vesna Cvetkov, Ilija Vasiljević, Mirko Petković (2015)

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering

    Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić (2020)
    γ-spectrometry, brushite, chukhrovite, phosphogypsum, radionuclides, recrystallization
    ... small amounts of P, Al, Fe and Sr, which are typical of phosphogypsum from various deposits around the world (Jalali et al., 2016; Zhou et al., 2016; Kandil et al., 2017). The recrystallized PGIP sample is enriched in calcium sulfate, containing only small amounts of Al, Si and P. A more precise ...
    ... assessment of application in civil engineering Josip l. Išekt, Lazar M. Kaluđerović** ', Nikola S. Vuković3, Maja Milošević1, Ivana Vukašinović? and Zorica P. Tomić? lUniversity of Belgrade, Faculty of Mining and Geology, Đušina 7, 11000 Belgrade, Serbia; 2University of Belgrade, Faculty of Agriculture, Nemanjina ...
    ... accordance with the low levels of impurities obtained using SEM-EDS and ICP-OES elemental ana- lyses. Specifically, in the PGIP sample, Al, Si and P calculated as oxides by stoichiometry amount to 1.02 wt.% in SEM-EDS ana- lysis. In addition, 10 trace elements in ICP-OES 5analysis (Table 3) comprise ...

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција

  • 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

  • Elektromagnetska sprega sistema litosfera-atmosfera-jonosfera

    Aleksandra B. Kolarski (2016-08-25)
    Radio talasi vrlo niskih frekvencija VLF (eng. Very Low Frequency) frekventnog opsega od 3 do 30 kHz, koji se prostiru talasovodom Zemlja-jonosfera (50 -90 km) su, kao što je poznato, efikasni i nezamenljivi u osmatranju pojava u niskoj jonosferi, sa tla...
    prostiranje talasa vrlo niskih frekvencija, talasovod Zemlja-jonosfera, globalno električno kolo, atmosfersko električno pražnjenje, kratkotrajne svetlosne pojave
    ... O., Soula, S., Berg, P., Boberg, F., Thejll, P., Christiansen, B., Ignaccio, M., Füllekrug, M., Verronen, P. T., Montanya, J., Crosby, N. (2008). Recent Results from Studies of Electric Dischaerges in the Mesosphere, Surv. Geophys. doi: 10.1007/s10712-008-9043-1. Ney, E. P. (1959). Cosmic radiation ...
    ... pristup, poremećaji faze i amplitude VLF signala mogu se definisati kao A i P, tako da je: P = Ppert - Preg i A = Apert - Areg. U zavisnosti od tipa poremećaja karakterističnog za datu trasu i datu TLE pojavu, poremećaji P i A mogu da budu pozitivni, negativni ili složeni - kombinovani (PRILOG ...
    ... 5169-5176, doi:10.1002/jgra.50460, Pasko, V. P. (2003). Electric jets. Nature, 423, pp. 927–929. Pasko, V. P., George, J. J. (2001). Three-dimensional modeling of blue jets and blue starters. EOS Trans. AGU - Fall Meet. Suppl., 82(47). Pasko, V. P., Inan, U. S., Bell, T. F., Reising, S. C. (1998) ...

  • 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
    ... during lyophi- lization (P < 0.01), reducing the RDI to about 80%. On the other hand, in formulation with sucrose and mannitol in a 3:2 ratio (S+M 3 + 2), the particle size remained almost unchanged (P—=0.089). The PDI did not change significantly in either formulation (P > 0.05). It remained below ...
    ... (RD!) after lyophilization of nanocrystal dispersion with different sucrose/mannitol ratios (z-ave: *, ** and *** for P < 0.05, 0.01 and 0.001, respectively, PDI: +, ++ and +++ for P < 0.05, 0.01 and 0.001, respectively), Description of the cake appearance was based on the terminology given in Patel ...
    ... could be applied in this study. After three months of storage, particle size was not significantly increased (P=0.997 and 0.951 for T+M 1 + 1, after one and three months, respectively; P = 0.260 and 0.937 for T+M 3 + 2, after one and three months, respectively), except for the formulation with trehalose ...

  • 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
    ... Gas Chromatography – Biochemicals, Narcotics and Essential Oils, B. Salih, Ö. Çelikbıçak, Eds., InTech, Rijeka, Croatia, 2012, Ch. 1, p. 3 5. R. A. Bourbonniere, P. A. Meyers, Limnol. Oceanogr. 41 (1996) 352 6. A. Bechtel, R. F. Sachsenhofer, I. Kolcon, R. Gratzer, A. Otto, W. Püttmann, Int. J. Coal ...
    ... Alimi, D. Jarvie, O. A. Ehinola, J. Petrol. Sci. Eng. 61 (2008) 99 11. H. I. Petersen, B. Holland, H. P. Nytoft, A. Cho, S. Piasecki, J. de la Cruz, J. H. Cornec, J. Petrol. Geol. 35 (2012) 127 12. R. P. Philp, Fossil Fuel Biomarkers. Applications and Spectra. Elsevier, Amsterdam, 1985, pp. 153, 159–161 ...
    ... Bull. 69 (1985) 1255 18. J. S. Sinninghe Damsté, F. Kenig, M. P. Koopmans, J. Köster, S. Schouten, J. M. Hayes, J. W. de Leeuw, Geochim. Cosmochim. Acta 59 (1995) 1895 19. O. T. Udo, C. M. Ekweozor, Energ. Fuels 4 (1990) 248 20. H. P. Nytoft, G. Kildahl-Andersen, O. J. Samuel, Org. Geochem. 41 (2010) ...

  • 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
    ... zonation of garnet in contact-metamorphic aureoles, Juneau gold belt, southeastern Alaska. The Canadian Mineralo­ gist 34, 1195–1209. Tančić P., Vulić P., Kaindl R., Sartory B. & Dimitrijević R. 2012: Macroscopically-zoned grandite from the garnetite skarn of 25ANISOTROPIC GROSSULAR–ANDRADITE ...
    ... SERBIA GEOLOGICA CARPATHICA, 2021, 72, 1, 17–25 Meka Presedla (Kopaonik Mountain, Serbia). Acta Geologica Sinica 86, 393–406. Tančić P., Kremenović A. & Vulić P. 2020: Structural dissymmetriza- tion of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia). ...
    ... growth histories in retrograded rocks. Journal of Petrology 33, 965–1005. https:// doi.org/10.1093/petrology/33.5.965 Horvath F., Bada G., Szafian P., Tari G., Adam A. & Cloetingh S. 2006: Formation and deformation of the Pannonian Basin: Constraints from observational data. In: Gee D.G. & Stephenson ...

  • Анализа квантитативног и квалитативног режима подземних вода: Случај изворишта за водоснабдевање Друговца у Смедереву

    Милан Павличић (2024)
    У раду су приказани резултати истражних радова који су спроведени у периоду од 13.04.2018. до 31.05.2019, у циљу дефинисање режима и категоризације резерви подземних вода на изворишту за водоснабдевање Друговца у Смедереву. Бунарима ИЕБДР-1/93 и ИЕБД-1/2002 су каптирани песковити седименати неогене старости. У току режимских осматрања вршени су тестови црпења, осматрања нивоа подземних вода, режимa падавина као и квалитетa подземних вода. Утврђене су укупне резерве подземних вода у количини од 5,3 l/s. Хемијске анализе воде показују да је хидрохемијски ...
    режимска осматрања, тестови црпења, неогени седименти, хидрохемијски режим, извориште
    ... Ha KojioHa 323 mm IleMeunranuja Tnune 71,45m p 74,25 m - ii A 78,42 m | b YnyurreHa OyHapcka KoHcTpykuja d Q 139,0mm 113,82 101,82 113,82m P 19.77| __s5,95 | ___ /feckoeu __| ___ __ ___ „gA„m ! i Ounrep uuinoBanin Q) 139,0 mi p | Mebyduurrep 0 139,0 mm Tnune |, 138,97 19.20 } ...
    ... cpe}iPbberojHiiPba TeMnepaTypa Ba3nlyxa oJt 13,3 "C sa0enexKkeHa 2019. ronn. 30.0 25.0 20.0 15.0 10.0 5.0 I „ -B uM MM -5.0 T e n e p a m y p a aa 30 yx a (" C) u cpeJiba MecćuHa BpcCJIHOCT M MaKcHMaJIHa MecCecuHa BPpeJIHOCT M MHHHMAaJIHa MeCcuHa BpeJIHOCT Cauka 2.4 - XucmooapaM ...
    ... 2018 -3105 2019.rovpne <—=CMarcmamta mHzaNa roniniia raaznia AB TV CT CE IT TE MB AP OK TO BA P HO BE MB AP JA HV AP OD EB PY AP MA PT AT IP PU I MA J I E I I E M B A P < 1018.ronuna > < 1019.romMBa > Cauka 6.9 - Xucmozpaw Meceunux cya naoaduHa 3a nepuoo anpuan 2018. ...

  • Optimizacija površinskog kopa Ciganuša – Škorac

    Vasilije Zejak (2024)
    U radu se govori o značaju optimizacije u savremenom rudarstvu i kako nam to softveri štede vreme, novac i olakšavaju procese planiranja.Konkretno u izradi ovog rada korišćen je softverski paket Whittle.Da bi se optimizacije mogla uspešno sprovesti, potrebno je konstruisati pre svega blok model ležišta kao i definisati niz tehno – ekonomskih parametara. Na osnovu tih podataka definiše se optimalna kontura i dinamika razvoja radova. U skladu sa definisanim podaci i odgovarajućim podlogama definisana je optimalna kontura površinskog kopa Ciganuša ...
    optimizacija, površinski kop Ciganuša - Škorac, blok model, strateško planiranje, optimalna kontura, dinamika razvoja, fazni razvoj
    ... sa ciljem definisanja optimalne konture kopa i dinamike razvija rudarskih radova. Optimizacija površinskog kopa Ciganuša – Škorac P PREGLED LITERURE Problem optimizacije ı dugoročnog planiranja rudarskih radova zaokuplja veliku pažnju naučne i stručne Javnosti. Povećanje interesovanja na temu ...
    ... tokom celog životnog veka rudnika. Uz primenu različitih tehnika optimizacije moguće Je rešiti veliko broj problema i samim tim omogućiti ostvarivanje ciljeva rudnika (Caccetta L, Hill P. S., 1987). Još 1960-tih godina počelo se sa istraživanjima na temu optimizacije u cilju postizanja boljih ...
    ... od toga da li su parametri u optimizacionom problemu poznati slučajnog karaktera ili neodređeni, razlikuju se: > Deterministički problemi > Problemi stohastičke optimizacije > Problemi optimizacije u uslovima neodređenosti Deterministički problemi su oni procesi kod kojih su svi elementi ı ...

  • Measuring semantic relevance of words in synsets

    Obradović Ivan, Krstev Cvetana, Vitas Duško (2010)