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Упит dcterms_creator_txt:Panaitescu C.

775 items

  • A tool for identifying the criticality in the disordered systems with metastable dynamics

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević (2021)
    Физика кондензоване материје

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... 2004, 46, 507–527. [CrossRef] Viti, C.; Giacobbe, C.; Galtieri, A.F. Quantitative determination of chrysotile in massive serpentinites using, DTA: Implications for asbestos determinations. Am. Mineral. 2011, 96, 1003—1011. [CrossRef] Groppo, C.; Rinaudo, C.; Cairo, S.; Gastaldi, D.; Compagnoni ...
    ... ŠA 5 E E e c ČI i _ [ P r K) J Cr Ni 3 0 5000 10000 Q0 1000 2000 Energy / eV Wavenumber / cm' Figure 7. Representative EDS (left) and Raman (right) spectra recorded on some spots of sample c (see Figure 1). Materials 2020, 13, 3597 9of18 a) Fj yrj 5 > | F c -1 [n] = š ...
    ... stretching; mode at ~3600—3700 cm~-! over 450 *C (de-hydroxylation) and then the formation of forsterite at a temperature over ~500 "C, with the characteristic doublet seen at ~820–-850 cm -1. Complete de-hydroxylation requires heating above ~700 *C. Comparison of the IR patterns in Figure 3 shows ...

  • 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
    ... the tensor square root of the right Cauchy-Green tensor C, as U = √ C. Firstly the principal values μ of C: μ1 = C11 + C22 + √ (C11 − C22)2 + 4C2 12 2 (B3) μ2 = C11 + C22 − √ (C11 − C22)2 + 4C2 12 2 (B4) From these the invariants of C and U can be calculated: IC = μ1 + μ2 I IC = μ1μ2 (B5) ...
    ... tensor—or, with respect to the deformed state E∗ —Almansi–Green strain tensor: E = 1 2 ( FT F − I ) = 1 2 ( C − I ) (23) D o w n lo a d e d fro m h ttp s ://a c a d e m ic .o u p .c o m /g ji/a rtic le /2 2 6 /2 /9 8 4 /6 1 9 5 5 2 9 b y g u e s t o n 1 9 J u ly 2 0 2 1 Mapping ...
    ... lo a d e d fro m h ttp s ://a c a d e m ic .o u p .c o m /g ji/a rtic le /2 2 6 /2 /9 8 4 /6 1 9 5 5 2 9 b y g u e s t o n 1 9 J u ly 2 0 2 1 990 T. Broerse et al. 1 1 E*= 5 (FF -I)= 5(B -I) (24) with right Cauchy—Green deformation tensor C and left Cauchy—Green deformation ...

  • Mogućnost korišćenјa toplotnih pumpi sa otpadnom toplotom iz postrojenјa za prečišćavanјe otpadnih voda kao toplotnim izvorom

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Boban Pavlović (2021)
    U narednom periodu se planira izgradnja nekoliko desetina sistema za prečišćavanje otpadnih voda u većim gradovima u Srbiji. Iskustva iz postrojenja koja su trenutno u radu, pokazuju da bi prečišćena otpadna voda, s obzirom na protok i temperaturu, mogla da predstavlja značajan izvor obnovljive energije. U radu su prikazani primeri dobre prakse korišćenja ove energije u sistemima daljinskog grejanja u zemljama Evropske unije. Analiziran je rad postrojenja za prečišćavanje otpadnih voda u Šapcu i razmotrena je mogućnost njegovog korišćenja ...
    toplotna pumpa, sistem daljinskog grejanja, postrojenje za prečišćavanje otpadnih voda
    ... daljinskog grejanja ima temperaturu vode u napojnom vodu 82°C. Temperatura povratne vode iz sistema daljinskog grejanja je oko 40°C. Minimalna temperatura otpadne vode iz postrojenja za prečišćavanje otpadne vode je 4°C, a maksimalna 18°C. Da bi se balansiralo oscilovanje u dnevnom protoku daljinskog ...
    ... potrebne toplotne energije u mreži i 33% ukupnog rashladnog opterećenja. Kanalizaciona otpadna voda temperature 10°C, koristi se za zagrevanje povratnog toka vode u SDG sa 50°C na 62°C (Slika 1). COP sistema iznosi 3,51. Slika 1. Shematski prikaz rada sistema u Helsinkiju Rad ovih postrojenja ...
    ... kanalizacionoj mreži je 6 °C. energija, ekonomija, ekologija, 2021, god. XXIII, br. 1 13 Mreža daljinskog grejanja je podeljena na 4 voda (Slika 2). Dva voda snabdevaju potrošače toplom vodom temperature 75°C (napojni vod). Temperatura vode u povratnom vodu je 50°C. Druga dva voda su sa t ...

  • Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)

    Ljiljana Vasić, Saša Milanović, Anita Puskás-Preszner, Laszlo Palcsu (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Synergy between the mineral deposit exploration and geothermal resources assessment on the example of "Valjevo" boron and lithium deposit in Serbia

    Nebojša Atanacković, Vladimir Živanović, Ana Vranješ, Sava Magazinović, Marinko Toljić, Ana Arifović, Branislav Potić (2023)
    Exploration of mineral deposits involves a collection of vast data sets on geological characteristics of the area. These data can largely contribute to the assessment of the geothermal potential, which can lead to an increase in the share of geothermal resources in the energy mix of the extractive industry and the local community. On the example of the "Valjevo" B-Li deposit, data on structural settings and previous hydrogeological investigations were combined with the results of resource drilling and geophysical ...
    Geothermal assessment, Mineral deposit exploration, Geothermal potential, Serbia
    ... (Figure 5). 7,416,000 ,420, 422, 7,424,000 š š Š • ELB idrihole Temperature isoline (e = 2 *C) Estimated temperatures in the Triassic reservoir -| Temperature *C High : 65 "C Low :12"C s s -i ~ FI s < Figure 5. Map of estimated temperatures in the Triassic reservoir in the central ...
    ... potential of the basement of the Valjevo-Mionica Neogene basin. The study estimated the basin's depth and expected temperatures ranging from 40"C to 65"%C for the Triassic limestone reservoir. The applied approach enabled the delineation of the perspective zones for further dedicated geothermal e ...
    ... gradients in the Neogene sediments, where conductive heat flow prevails, are 0.049 – 0.069 SC/m (assuming 12 "C average air temperature). These values are considered high compared to the 0.03 "C/m adopted as the average for this part of Europe [3]. The Neogene geothermal gradient map is combined with ...

  • Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations

    Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković (2021)
    The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...
    severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija
    ... SMM SG SMM-F SMM-L SG-F SG-L foliation lin ea tio n SMM SG SMM-F SMM-L C re ta ce ou s = pr es en t- da y SG-F SG-L C re ta ce ou s = pr es en t- da y C-F SMM-F SMM-L C-L Prese nt-d ay C re ta ce ou s Ol-M rotation Fig. 6. Mechanism of the structural evolution of ...
    ... redna G ora S redna G ora Zone Zone S o u t h C a r p a t h i a n s S o u t h C a r p a t h i a n s ZagajicaDepression ZagajicaDepression P an nonian Basin P an nonian Basin S e r b ia n C a r p a t h i a n s S e r b ia n C a r p a t h i a n s B a l k a n i d e s B a l ...
    ... k a n i d e s M o e s i a n M o e s i a n P m l a t r f o P m l a t r f o T F T F TFTF C F C F M o r a v a V a l l e y C o r r i d o r M o r a v a V a l l e y C o r r i d o r Jastrebac Mts.Jastrebac Mts. Vršac Mts.Vršac Mts. Western Vardar Adria-derived nitsU ...

  • Insights into dike nucleation and eruption dynamics from high-resolution seismic imaging of magmatic system at the East Pacific Rise

    Milena Marjanović, Suzanne M. Carbotte, Alexandre Stopin, Satish C. Singh, René-Édouard Plessix, Miloš Marjanović, Mladen R. Nedimović, Juan Pablo Canales, Hélène D. Carton, John C. Mutter, Javier Escartín (2023)
    Multidisciplinary

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

    Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)
    Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography
    ... assemblages: SCG 48a (Fig. 5): Canesium sp., Capnodoce sp. cf. C. ana- petes De Wever, C. sp. cf. C. extenta Blome, C. sp. cf. C. crys- tallina Pessagno, C.sp.cf.C.sarisa De Wever, Capnuchosphaera sp. cf. C. triassica De Wever, Corum sp. cf. C. speciosum Blome,Japonocampe sp. cf.J. mundum (Blome), ...
    ... following taxa were determined (Fig. 7): Canopfum sp. cf. C. macoyense Blome, C. crystallina Pessagno group, Capnuchosphaera theloides De Wever, C. sp. cf. C. triassica De Wever, Capnuchosphaera sp., Corum sp. cf. C. regium Blome, C. speciosum Blome, Crucella? sp., Xipha sp. cf. ŽX. pessagnoi ...
    ... (late Carnian to middle Norian): I-2 — Capnuchosphaera sp. cf. C. triassica De Wever, 3 — Capnodoce sp. cf. C. sarisa De Wever; 4 — Capnodoce sp. cf. C. anapetes De Wever; 5 — Capnodoce sp. cf. C. crystallina Pessagno; 6 — Capnodoce sp. cf. C. extenta Blome; 7 — Triassoastrum sp. cf. T. noricum (Kozur ...

  • 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)
    ... ide herbicide could include coordination bonds between C=O and the exchangeable cation, and/or H bonds between C=O and the hydration water bcecause C=O 333 SERBIAN SOCIETY OF SOIL SCIENCE Soils for Future under Global Challenges and C-N in this compound are in a conjugation mode due to the ...
    ... are: (1) shifting of the band at 1674 cm-! (C=O vibrations) to lower wavenumbers (1639 cm'!) after the sorption of the herbicide, (2) slightly movement of phenyl ring bands from 1462 cm'"! to lower wavenumbers and (3) disappearance of 1363 cm'! band (C=C-N vibrations) after adsorption. According to ...
    ... nites causes the redshift of the C=O absorption band which indicates that the C=O group participated in the formation of a bond with the HDTMA-montmorillonite. Adsorption of an aromatic compound such as S- metolachlor on PTMA-montmorillonite takes place, beside C=O group, through the interaction ...

  • 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
    ... 80 cccc vp a a a a v p p p p p v v vr r q q aa c v r v rv  ° pp p p p pp 1300 °C 1212 °C 920 °C 872 °C 818 °C 670 °C a - TiO 2 v - CaSiO 3 r - TiO 2 q - SiO 2 p - CaTiO 3 c - CaCO 3 Слика 4.1.4.7. Дијаграм праха сфен30 након синтеровања ...
    ... аморфизације (слика 4.1.4.1.), као и до трансформације анатаса у рутил. 20 40 60  ° a cc cc c c c c c cc ccr r r a a 120 min 60 min 30 min 15 min c - CaCO 3 a, r - TiO 2 a r c Слика 4.1.4.1. Дијаграми механички активираних прахова сфен15, сфен30, сфен60 и сфен120. Симболи: ...
    ... el (% ) 1100 °C 900 °C 1000 °C 1200 °C MA (min) 1250 °C Слика 4.1.3.1. Зависност релативне густине ρrel (у %) узорака сфен15, сфен30, сфен60 и сфен120 синтерованих у току 2 сата од времена механичке активације (МА) на температурама 900, 1000, 1100, 1200 и 1250 °C. Анализом резултата ...

  • 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
    ... 80 cccc vp a a a a v p p p p p v v vr r q q aa c v r v rv  ° pp p p p pp 1300 °C 1212 °C 920 °C 872 °C 818 °C 670 °C a - TiO 2 v - CaSiO 3 r - TiO 2 q - SiO 2 p - CaTiO 3 c - CaCO 3 Слика 4.1.4.7. Дијаграм праха сфен30 након синтеровања ...
    ... аморфизације (слика 4.1.4.1.), као и до трансформације анатаса у рутил. 20 40 60  ° a cc cc c c c c c cc ccr r r a a 120 min 60 min 30 min 15 min c - CaCO 3 a, r - TiO 2 a r c Слика 4.1.4.1. Дијаграми механички активираних прахова сфен15, сфен30, сфен60 и сфен120. Симболи: ...
    ... el (% ) 1100 °C 900 °C 1000 °C 1200 °C MA (min) 1250 °C Слика 4.1.3.1. Зависност релативне густине ρrel (у %) узорака сфен15, сфен30, сфен60 и сфен120 синтерованих у току 2 сата од времена механичке активације (МА) на температурама 900, 1000, 1100, 1200 и 1250 °C. Анализом резултата ...

  • Sustainable Modularity Approach to Facilities Development Based on Geothermal Energy Potential

    Nataša Čuković-Ignjatović, Ana Vranješ, Dušan Ignjatović, Dejan Milenić, Olivera Krunić (2021)
    The study presented in this paper assessed the multidisciplinary approach of geothermal potential in the area of the most southeastern part of the Pannonian basin, focused on resources utilization. This study aims to present a method for the cascade use of geothermal energy as a source of thermal energy for space heating and cooling and as a resource for balneological purposes. Two particular sites were selected—one in a natural environment; the other within a small settlement. Geothermal resources come ...
    геотермална енергија, Панонски басен, геотермална каскада, енергетска ефикасност, бањски центри, балнеологија, биоклиматска архитектура, стратегије пасивног дизајнирања, модуларни објекти
    ... • temperature reduction, ∆T = 19 ◦C, which is adopted to meet temperature conditions for bathing (35 ◦C). The calculation of disposable thermal energy from the geothermal borehole VS-2/H was performed according to the Equation (1). E = 4.2 kJ/kg/◦C × 12 l/s × 19◦C which brought around 950 kW of thermal ...
    ... climate data for Ljuba and Banatsko Veliko Selo. Average Temperature 1 Design Temperature 2 Heating Days HDD Ljuba 5.4 ◦C −15 ◦C 184 2686 Banatsko Veliko Selo 4.9 ◦C −15.3 ◦C 183 2763 1 Average temperature during the hating season. 2 Design temperature for sizing the heating system, HDD— Heating ...
    ... May June July August September October November December Avg. Temperature (◦C) 0.8 2.5 7.4 13.2 18 21.9 23.9 23.9 18.6 13.2 7.9 2.2 Min. Temperature (◦C) −2.3 −1.4 2.5 7.9 12.6 16.5 18.5 18.5 14 9 4.6 −0.6 Max. Temperature (◦C) 4.3 6.7 12.4 18.2 23 26.7 28.7 28.9 23.4 17.9 11.8 5.4 Precipitation/Rainfall ...

  • 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

  • Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery

    Maja Milošević, Biljana Đorđević, Mihovil Logar (2020)
    калцит, сирова глина, традиционална керамика, Злакуса
    ... 1250 C - calcite — F- feldspar r ps 5 1000 š ž 750 ' 50 o 250 w O m 0 T T T ı 45 5 5 7 ć60 50000 ) sample ClBd c C- calcite Q-quartz 40000 -| Sm - smectite MI - mica/illite -} K/H - kaolinite/halloysite 530000 8 > 20000 } 10000 [7 ' KH /Sm M k m C O c cc c cc c 0 - ...
    ... carbonate is evident from a large band at ~950%C and a small endothermic band at ~750% (Fig. 5). Typical and strong decomposition effects for calcite begin at ~820%C, reach a peak at 950%C, slowly drop at 990% and afterwards end rapidly at ~1010*C, in accordance with previ- ous work (Beck, 1946; ...
    ... sample CIMx 125 -| in te ns it y (c ou nt s) in te ns it y (c ou nt s) Fig. 2. XRPD traces of the CIMx and CIBd samples together with oriented patterns of the clay fraction: untreated sample (AD), solvated with ethylene glycol (EG) and heated at 550"C (H). Clay Minerals Sample CIMx ...

  • Terenska nastava iz geofizike: Arheološki lokaliteti na području Trstenika

    Dragana Đurić, Jelena Vukčević, Dejan Vučković, Ivana Vasiljević, Vesna Cvetkov (2020)
    geofizika, geofizička istraživanja u arheologiji, arheologija u okolini Trstenika
    ... merenja, b) karta vertikalnog gradijenta ZMP, c) prikaz filtrirane karte pod b) u formi sen- čenog reljefa, d) pozitivna arheološka sondа (Марковић и др., 2017; Вучковић и др., 2017) 34 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l ...
    ... Универзитет у Београду Wynn, J. C. 1986. A review of geop- hysical methods used in archaeology, Geoarcheology International Journal, 1/ 3: 245-257. https://doi.org/10.1002/ gea.3340010302 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h ...
    ... sve do srednjeg veka (Рашковић, 2003). Slika 1. Geografski položaj istraživanih arheoloških lokaliteta 32 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e Lokalitet, koji je ...

  • ‘Blue-’ and ‘Brown-speckled’ pottery from Qalhât, the Sultanate of Oman (13–16th centuries): Comparison with traditional Omani 19–20 century productions

    Liliana Gianni, Hélène Renel, Aleksandar Kremenović, Philippe Colomban (2020)
    Representative ‘Blue speckled’ (13–16th centuries) and ‘Brown speckled’ (13–21st century) wares recovered from the excavations in Qalhât or collected around Bahlâ city (Sultanate of Oman) were characterized by XRPD, SEM-EDS, Raman/optical microspectroscopy, and thermal expansion. Minerals present in the body (quartz, augite and albite as major phases, calcite, dolomite, rutile, anatase, phosphate, hematite and magnetite as minor phases) were identified by XRPD and/or Raman spectroscopy. SEM-EDXS microanalysis was performed on the glazes in order to compare their composition, especially ...
    Firing, Glaze, Traditional ceramics, Provenance studies, Augite

  • Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova

    Zoran M. Štirbanović (2015-07-01)
    Rudarstvo, a u okviru njega i priprema mineralnih sirovina, se odlikuje složenošću tehnoloških procesa što je posledica velikog broja uticajnih parametara. Samim tim je potrebno biti veoma obazriv prilikom donošenja odluka u oblasti rudarstva. U cilju što efikasnijeg funkcionisanja procesa, moguće je primeniti različite metode koje služe za pojednostavljenje procesa odlučivanja. Jedna od takvih metoda jeste i teorija grubih skupova. Ona predstavlja relativno novu matematičku teoriju koja je pogodna za razumevanje nepreciznih i nepotpunih podataka kao i za otkrivanje ...
    rudarstvo, priprema mineralnih sirovina, teorija grubih skupova, višekriterijumsko odlučivanje, flotacijsko jalovište, flotacijski kolektor, flotaciona mašina
    ... Očigledno, ako je C’⊆C D-redukcija od C, onda je C’ minimalni podskup od C takav da γ(𝐶,𝐷) = γ(𝐶′,𝐷). • Reći ćemo da je atribut a∈C D-nepotreban u C, ako 𝑃𝑂𝑆𝐶(𝐷) = 𝑃𝑂𝑆(𝐶−{𝑎})(𝐷), u suprotnom je atribut a D-neophodan u C. • Ako su svi atributi a∈C C-neophodni u C, onda se C može nazvati ...
    ... ja M(D). 𝐶𝑂𝑅𝐸𝐷(𝐶) = �𝑎 ∈ 𝐶: 𝑐𝑖𝑗 = (𝑎), za neko 𝑖, 𝑗�. Skup C’ ⊆ C je D-redukcija od C, ako je C’ minimalni (s obzirom na inkluziju) podskup od C takav da je: C’∩ c ≠ ∅ za svaki ne prazan unos c (c≠∅) u MD(C). Prema tome, D-redukcija je minimalni podskup atributa koji razlikuje sve ...
    ... Podskup C’⊆C je D-redukcija od C, akko je C’ D-nezavistan i 𝑃𝑂𝑆𝐶(𝐷) =𝑃𝑂𝑆𝐶′(𝐷). Skup svih D-neophodnih atributa u C se naziva D-jezgro od C, i obeležava se sa CORED(C). U ovom slučaju takođe imamo svojstvo: 𝐶𝑂𝑅𝐸𝐷(𝐶) = ⋂𝑅𝑒𝑑𝐷(𝐶), gde je RedD(C) familija svih D-redukcija od C. Ako ...

  • Zbirka rešenih zadataka iz termodinamike

    Marija Živković, Aleksandar Madžarević (2023)
    termodinamika
    ... 12% CO 2 , 6% H 2 O , 5% O 2 i 77% N 2 , počet- nog stanja 0,9 MPa i 1000 °C izentropski ekspandira u turbini do pritiska 0,1 MPa, a zatim se izobarski hladi do 150 °C predajući toplotu vodi tem- perature 25 °C, koja se pri stalnom pritisku 0,2 MPa zagreva do stanja su- vozasićene pare. Za ...
    ... sa pokretnim klipom (pogledaj skicu). U početnom trenutku azot se nalazi na pritisku 800 kPa i tempe- raturi 127 °C. Gasu se dovodi toplota dok se ne dostigne temperatura od 527 °C. Klip će početi da se podiže kada se dostigne pritisak od 1500 kPa. Skicirati proces u p-v dijagramu i odrediti z ...
    ... entalpija rashladne vode čija je temperatura 25 °C, a pritisak 0,2 MPa: i krajnja specifična entalpija suvozasićene pare jednaka specifičnoj entalpiji suvozasi- ćene pare na pritisku od 0,2 MPa što je tablična vrednost: 25 kg vazduha temperature 500 °C i pritiska 0,7 MPa izentropski se širi do pritiska ...