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Упит dcterms_subject_txt:fragmentation size

320 items

  • Model inteligentnog sistema adaptivnog upravljanja procesom prerade rude

    Ivana M. Jovanović (2016-01-13)
    U oblasti procesa prerade rude, flotacijska koncentracija predstavlja jednu od najznačajnijih i najčešće primenjivanih metoda separacije korisnih od nekorisnih minerala. Samim tim, veoma je važno osigurati uspešan rad flotacijskog postrojenja kroz dostizanje zadovoljavajućih tehno-ekonomskih pokazatelja. Cilj upravljanja procesom flotacijske koncentracije je upravo optimizacija kvaliteta i iskorišćenja korisne komponente u koncentratu uz maksimizaciju profita. Shodno tome, istraživanja na polju modelovanja i upravljanja ovim procesom zauzimaju značajno mesto u praksi kontolnog inženjenringa.Teorijska istraživanja u okviru doktorske disertacije obuhvatila su analizu položaja ...
    flotacijska koncentracija, modelovanje, upravljanje, inteligentni sistem, soft kompjuting, fazi logika, veštačke neuronske mreže
    ... C., 2012. Effect of Particle Size on Galena Flotation Kinetics Using Fuzzy Logic. Journal of North-eastern University(Natural Science) 33 (2), pp. 279–283 157. Li, Y., Zhao, W., Gui, X., Zhang, X., 2013a. Flotation kinetics and separation selectivity of coal size fractions. Physicochemical Problems ...
    ... The MIT Press, Cambridge, Massachusetts, 221p. 188. Mohammed, A.A., 2007. Removal of Emulsified Paraffine from Water: Effect of Bubble Size and Particle Size on Kinetic of Flotation, Iraqi Journal of Chemical and Petroleum Engineering, Vol.8, No.3, pp. 1-5 189. Mohanty, S., 2009. Artificial neural ...
    ... Zhu, H., Lin, Y., Shi, C., 2012. Flotation process fault detection using output PDF of bubble size distribution. Minerals Engineering 26, pp. 5–12 302. Yang, C., Xu, C., Mu, X., Zhou, K., 2009. Bubble size estimation using interfacial morphological information for mineral flotation process monitoring ...

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... concentration process. The ore is crushed, then milled to the average size of 0.1 mm in grain diameter. The grain-size distribution is of vital interest for the environmental impact assessment of the tailings. Based on the grain-size distribution investigation, done for the tailing waste Bostanište, the ...

  • Building learning capacity by blending different sources of knowledge

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić (2016)
    ... the prerequisites needed for its use, without even seeing the resource itself (Velichová, 2008). As the amount of OER reaches a considerable size, it becomes important that each learning resource is well described and tagged in a standard way, and in machine readable form. This makes resources ...
    ... whether it is an electronic or printed document, a set of slides, a website, or a cd-rom/dvd, audio, or video. Other technical data are the resource size, given in bytes for digital resources, and resource location, namely its URL. Educational data, specific for educational resources, are naturally ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • Димензионисање транспортера на спољашњем одлагалишту повшинског копа Западни Костолац

    Петар Миловановић (2024)
    У савременом рударству, површински копови угља наилазе на различите проблеме које треба превазићи зарад добијања потребне количине угља. Као највећи потрошачи овог енергента су термоелектране, на основу овога можемо да закључимо колико су блиско повезани добра и континуирана производња на површинском копу и рад термоелектрана. Са задатком да се обезбеди стабилна и континуирана производња, потребно је да се направи добар одабир транспортера. У овом раду, за димензионисање потребног транспортера са траком, коришћен је програмски пакет Helix.Програмски пакет Helix представља један ...
    транспортна трака, снага погона, затезна чврстоћа, угаљ, Западни Костолац, Helix
    ... Section Loading Max Capacity 10500 tonnes/hr 'Surcharge Angle 15 deg 'Carry Idler Trough Angle 35 Angle of Repose 30 deg Belt Dimensions Material Lump size- 400 mm Top Cover Thickness 16 mm Belt Make & Class Bottom Cover Thickness 8 mm Belt Category Dunlop Steel Belt Carcass Thickness 54 mm Belt Description ...
    ... Material Description Sljunak Drmno Surcharge Angle 15 deg Low Bulk Density 1700 kglm3 Angle of Repose 30 deg High Bulk Density 1700 kg/m3 Material Lump size 400 mm Conveyor Data Conveying Distance 1779.82 m Design Capacity 10500 tonnes/hr Nett Lift / Lower (-) 5.50 m Belt Speed 4.65 m/s Belt Details ...
    ... Full Load Speed 1488 rpm Motor Voltage 415 Volts Motor Full Load Torque 9999 Nm Number of poles 4 Motor Full Load Current 999 Amps Motor Frame Size DUMMY Motor Efficiency Q) Duty Point 93 % Motor Shaft Diameter 999 mm Motor Power Factor Q) Duty Pt 0.77 Motor Shaft Height 999 mm Mass of Motor ...

  • Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study

    Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović (2019)
    Debris flows induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy to obtain pre event and post event high-resolution data in the rural or mountainous area. Thus, the topology of terrain is the most important input parameter for the every real case ...
    tecišta, modeliranje, RAMMS, DEM
    ... and magmatic rocks with Palaeozoic metamorphic rocks. Debris flow material is highly heterogeneous in lithological composition, as well as grain size distribution (up to m 3 boulders) (Fig. 3). Figure 3 UAV images of a) soure area b) transportation zone (April 2017) Proceedings of the ...

  • Why classical sequence stratigraphy doesn't work in Pannonian basin?

    Dejan Radivojević (2018)
    basen iza ostrvskog luka, detačment, miocen, Panonski basen, riftogeneza, sekvenciona stratigrafija
    ...  Early rift climax sediments are usually present only in deep parts of the basin. The reasons for their  absence are that graben haven't reach its final size in the moment of deposition and the subsidence rate  is much lower than aggradation. From three rift climax systems tract the early one usually has ...

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...
    ... 1. Generating a text (Di) from records and fields of the project summary related to a particular project document, where i = 1, . . . N and N is the size of the document collection; 2. Lemmatizing and POS tagging of all Di texts; 3. Recognizing NEs and assigning the chosen types to documents; 4. Selecting ...
    ... dictionary of the whole document collection from all words selected in Step 4. For each term Tk in the document collection, k = 1, . . . M , where M is the size of the dictionary of document collection: (a) calculating document frequency dfk as the number of documents in the collection in which the term Tk ...
    ... given on each page, and users take only the first page into consideration. The advantage of this measure is that it does not require an estimate of the size of the set of relevant documents, but its disadvantage is that it is the least stable of the commonly used evaluation measures and that it does not ...

  • 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
    ... width - W (i.e., mesial width for upper teeth, and distal width for lower teeth). The dimen- sions of Bogovina rhinoceros teeth were compared to the size ranges for S. etruscus, S. hundsheimen- sis, S. hemitoechus, and S. kirchbergensis, which were obtained based on the data reported by For- telius et ...
    ... 2008). As seen in Figure 7A, the specimen from Bogovina Cave clearly shows U-shaped entoflexid, thus indicating a caballoid horse. Furthermore, the size of molar (L = 33.8 mm, W = 14.7 mm; measured at the occlu- sal surface, excluding cement) is comparable to the large-sized group of caballoid horses ...
    ... Bogovina Cave are clearly brachydont, as expected for Stephanorhinus hund- sheimensis (Guérin, 1980; Fortelius et al., 1993; Lacombat, 2007). In terms of size, most of the specimens fit the metric data reported for S. hund- sheimensis. As expected for a deciduous speci- men, HMP-130 is small (narrow) relative ...

  • Photocatalytic Activity of the V2O5 Catalyst toward Selected Pharmaceuticals and Their Mixture: Influence of the Molecular Structure on the Efficiency of the Process

    Sanja J. Armaković, Aleksandra Jovanoski Kostić, Andrijana Bilić, Maria M. Savanović, Nataša Tomić, Aleksandar Kremenović, Maja Šćepanović, Mirjana Grujić-Brojčin, Jovana Ćirković, Stevan Armaković (2023)
    Due to the inability of conventional wastewater treatment procedures to remove organic pharmaceutical pollutants, active pharmaceutical components remain in wastewater and even reach tap water. In terms of pharmaceutical pollutants, the scientific community focuses on -blockers due to their extensive (over)usage and moderately high solubility. In this study, the photocatalytic activity of V2O5 was investigated through the degradation of nadolol (NAD), pindolol (PIN), metoprolol (MET), and their mixture under ultraviolet (UV) irradiation in water. For the preparation of V2O5, facile ...
    DFT analysis, metoprolol, nadolol, nanomaterial characterization, photocatalysis, pindolol, β-blocker
    ... speed of 5.1 ?/min. The low background sing}|e crystal silicon sample holder minimizes the background. Unit cell parameters and average crystallite size and lattice strain values were obtained by PDXL2 integrated X-ray powder diffraction software (Version 2.8.30; Rigaku Corporation, Tokyo, Japan) ...
    ... analyzed by Shi- madzu UFLC-PDA (Shimadzu Scientific Instruments, Columbia, Maryland, USA) Eclipse XDB-C18 column, 1550 mm x 4.6 mm i.d., particle size 5 um, 30 *C). The UV/Vis PDA detector was set at wavelengths of maximum absorption of each B-blocker: 210 nm (for NAD), 217 nm (for PIN), and 223 ...
    ... hydrothermal synthesis was used. X-ray diffraction identifies only one crystalline phase in the sample, which is proven by the fact that the crystallite size (1251(35) A) and lattice strain (0.16(2)%) values point to well-crystallized material with a significant lattice strain. SEM micrographs show that ...

  • Одређивање оптималне производње дубинске пумпе на клипним шипкама

    Небојша Савић (2024)
    Дужи временски период током историје производње нафте, дубинске пумпе на клипним шипкама су први и у многим случајевима једини избор када су у питању механичке методе експлоатације. Правилан одабир сваког појединачног елемента система омогућава оптимизацију која са собом повлачи бенефите у виду повећавања ефикасности и смањења трошкова. Тренутно примењени систем дубинских пумпи на клипним шипкама на лежишту „Н“ обезбеђује стабилну производњу и реализацију годишњих планова производње без већих проблема. У овом раду је приказан начин оптимизације производње дубинским пумпама ...
    дубинска пумпа, оптимизација, производња, потисни вентил
    ... 5%,0 Pump conditions: qas n Minimum pu'ro lenath (m) 43 Pump tvpe' Insen Pumo efbcvencyffdaqe | 4%%/95% | Recormended plunqerlength (m) 15 Plunaer size (men) 318 Pumo friction (N). 890 Bod wpg daaiani zi - “ NG PRGRGI2 /3,50 puzuzuu uuu= uuu Diameter (mm) |___RodGrade. ] Lengih | Mam Tem. | Foc. ...
    ... Pump conditions: qasim. Minwrum purro lenath (m): 49 Pump type iosert Pump efficiency/fdlaqe | 41%/95% | Fiecommended plunaor lenqth (m)- 5 Plunqer size (mm) 38 1 Pumop fnction (N)- 890 Rod string design Rod string stress analysis (service factor: 0.9) Diameter (mm) | __RodGrado # Guides/Rod 222 ...
    ... bottomj: 43 Pump conditions: Full Minimum pu:mo lenafh {m). 49 Pumo type- insert Pumo vol, efficiency: 72% Recorenended plunqer lenqth (m) 8 Plunqer size (memn) 38 1 Puro frictvon (N}: 890 Rod string design Rod string stress analysis (service factor: 0.9) Diameter (mm) RodGradoe LW M Tenm. | Fnc, | ...

  • Tectonic evolution of the Circum-Moesian orocline of the Carpatho-Balkanides: Paleomagnetic constraints

    Emő Márton, Vesna Cvetkov, Miodrag Banješević, Gábor Imre, Aleksandar Pačevski (2024)
    Apuseni-Banat-Timok-Srednogorie belt, danubicum, paleomagnetism, oroclinal bending

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... spectra. The average particle size computed from X-ray diffraction pattern data for sphene is smaller than the average particle size obtained by scanning electron microscope, suggesting that the particles are composed of packed crystallites. Also, reduction of particle size occurred during high pressure ...
    ... of 30 min on 1200 °C. The microstructure analysis from scanning electron microscope images shows bimodal grain distribution. The average particle size estimated from SEM images is 3 µm and 5 µm. Rietveld refinement confirms that sphene crystallizes in space group P21/a аѕ a principle crystalline ...
    ... 999Cr0.001TiO5. The microstructure analysis from scanning electron microscope images shows unimodal grain distribution with the average particle size around 1 µm which is very desirable for the ceramic pigment application. The difussion-reflectance spectra of sphene show a broad band centered ...

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... spectra. The average particle size computed from X-ray diffraction pattern data for sphene is smaller than the average particle size obtained by scanning electron microscope, suggesting that the particles are composed of packed crystallites. Also, reduction of particle size occurred during high pressure ...
    ... of 30 min on 1200 °C. The microstructure analysis from scanning electron microscope images shows bimodal grain distribution. The average particle size estimated from SEM images is 3 µm and 5 µm. Rietveld refinement confirms that sphene crystallizes in space group P21/a аѕ a principle crystalline ...
    ... 999Cr0.001TiO5. The microstructure analysis from scanning electron microscope images shows unimodal grain distribution with the average particle size around 1 µm which is very desirable for the ceramic pigment application. The difussion-reflectance spectra of sphene show a broad band centered ...

  • 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)

  • Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs

    Saša Milanović, Ljiljana Vasić (2021)
    Earth and Planetary Sciences (miscellaneous), Water Science and Technology

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... component and task component. The text component contains an editor for writing plain text, with basic editing functions, such as choosing fonts and size of text, adding pictures and links and setting up indentations. Besides the basic editor, the creator of materials can use html view of text. In ...

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...
    landfill, geotechnical investigations, transfer station
    ... however, that waste is a very poor quality primarily due to: heterogeneous composition (both by the participation of individual materials and by their size), insufficient compaction and consolidation. Due to this specific porous structure, the physical and mechanical characteristics of the waste are extremely ...

  • Numerical modeling of Selanac debris flow propagation using SPH code

    Jelka Krušić, Biljana Abolmasov, Miloš Marjanović, Manuel Pastor, Saeid M. Tayyebi (2021)
    The Selanac debris flow is a very huge event triggered after extreme rainfall caused by Cyclone Tamara activity in the Republic of Serbia in May 2014. The Selanac case study was already modelling in different programs using Voellmy rheology assumptions like RAMMS software. In this paper research are focusing particularly on the process of debris flowing from initiation zone to main deposition area using Geoflow SPH two-phase model considering frictional rheology law. Main rheological parameters are back-calculated using also ...
    debris flow, modelling, SPH code, DEM
    ... heterogeneous in lithological SCG-XIII INTERNATIONAL SYMPOSIUM ON LANDSLIDES. CARTAGENA, COLOMBIA- JUNE 15th-19th-2020 composition, as well as grain size distribution (from fines to up to m 3 boulders in volume). The total length of the flow is 1.5 km and width is about 350 m in the widest part ...

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... the terms were taken, as well as the equivalent terms in other languages (currently, only english equivalents are present, see exam- ple 1). The size of the vocabulary, namely, the number of concepts is not finite, but the current version features around 3800 basic, universally accepted geologic ...
    ... terms in Serbian: Rang jedinice, Rangiranje ugljonos- nih jedinica, with the terms in english to the left: Arranged fabric, Range value, Fold range, Size range). The user selects one of the proposed rANkA STANkOvIć eT Al. ‒ The DevelOPmeNT OF The geOlISSTerm TermINOlOgIcAl DIcTIONAry INFOtheca, ...