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Упит dcterms_subject_txt:finite element analysis

913 items

  • Развој модела конструкције просторија отварања рудника са подземном експлоатацијом

    Dražana M. Tošić (2016-08-26)
    Приликом израде подземних просторија у стјенској маси долази до нарушавања природне равнотеже напонских стања стијенског масива који су владали прије израде тих просторија, при чему долази до појаве прертасподјеле напона и његове концентрације у појединим правцима и тачкама, односно долази до појаве пластичних деформација које су праћене ломљењем стијенске масе и кретањима материјала према откопаном простору...
    модел, метод коначних елемената, просторија отварања, напон, дефеормација стијенског масива, алгоритам функционалних зависности

  • The analysis of the geothermal energy capacity for power generation in Serbia

    Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)
    Renewable Energy, Sustainability and the Environment
    ... of geothermometers Silicon is second highest element (first is oxygen) in the Earth's crust. It is a metalloid, under carbon in the Periodic table, between aluminum and phosphorus, having both metal and non-metal properties. It is a very important element in geothermometry, because silicates are ex- ...
    ... 04:08:19 The analysis of the geothermal energy capacity for power generation in Serbia Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] The analysis of the geothermal ...
    ... � � � � 731 452 27315 [ . log )] . (3) Stojkovi}, J. S., et al.: The Analysis of the Geothermal Energy Capacity for ... 970 THERMAL SCIENCE: Year 2013, Vol. 17, No. 4, pp. 969-976 Stojkovic, J. S., et a/.: The Analysis of the Geothermal Energy Capacity for ... 970 THERMAL SCIENCE: Year 2013, Vol ...

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... 02–0.55 0.28 0.20 0.16 – Mn 0.01–0.15 0.03 0.04 0.02 0.001–0.04 0.02 0.01 0.01 0.01–0.03 0.02 0.01 0.01 100±6 Table 6. Trace element content of the Kovin lignite. Element I seam II seam III seam Clarke value of brown coala, ppmMin-Max X̅ s X̅ g Min-Max X̅ s X̅ g Min-Max X̅ s X̅ g As 4.00-140 ...
    ... physical factors in mire systems provide specific en­ vironments in which minerals could be deposited or formed Table 7. Rare earth element content in the Kovin lignite. Element I seam II seam III seam Clarke value of Brown coala, ppmMin-Max X̅ s X̅ g Min-Max X̅ s X̅ g Min-Max X̅ s X̅ g La 3.56–12 ...
    ... mixtures of xylite and matrix and matrix and mineral rich coals with two thin xy­ Table 8. Element affinities deduced from calculation of Pearson’s correlation coefficients between the concentration of each element in the coal and ash yield, total sulphur content, Si and Al. I seam II seam III seam ...

  • The subthermal potential of karstic groundwater of Kučaj–Beljanica region in Serbia estimated by the multivariate analysis

    Ljiljana Vasić, Dragana Ž. Živojinovic, Vladana Rajaković-Ognjanović, Huang Fen, Cao Jianhua (2021)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • 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
    ... флора Камени - це се разликује и по таксономском саставу. У овој палеофитоасоцијацији преовлађују четинари и елементи широколисне вечнозелене вегетације. У другим палеогеним флорама елементи широколисно-вечнозелене вегетације су изузетно ретки. У палеофитоасоцијацији Прањанског басена доминирају конифери ...
    ... климу док су ксерофилни вегетациони елементи слабо заступљени. За разлику од доњо миоценских флора Србије које се карактеришу доминацијом широколисне, вечнозелене вегета ције и великом заступље - ношћу Laureaceae, посе бно Daphnogene, у флори Каменице ови флорни елементи су мање при - сутни. На основу ...
    ... leaves – a physiognomic analysis of european vegetation. 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): ...

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... landslides both spatially and temporally (temporal dimension through the designated rainfall period, i.e. annual). ● Element at risk inventorying: housing sector as element at risk, mapped on the basis of building structure and average population density per unit; building structure polygon ...
    ... and environmental factors were coming from a separate detailed study on flooding and landsliding hazard in the City of Tuzla. The inventory of element at risk, in this case the housing sector, represented by weighted population density, was also very important input, which needed to be prepared ...
    ... estimations on population distribution as possible. Eventually, overlapping spatial and temporal dimension of the process, as well as detailed element at risk inventory, resulted in a very detailed, very realistic landslide risk map. The map depicts realistic risk distribution over the populated ...

  • 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)

  • Epidotizacija sanidina u kvarclatitima Grota

    Danica Srećković-Batoćanin, Suzana Erić, Nikola Novičić, Nikola Pašajlić, Natalija Batoćanin (2023)
    Propilitska alteracija je veoma česta u gornjokredno-tercijarnim vulkanitima Srbije. Kvarclatiti Grota, otkriveni na dubini od oko 550 m u jednoj od istražnih bušotina su holokristalaste porfirske strukture sa fenokristalima sanidina dimenzija i do 1,5 x 2 cm. Optičkim ispitivanjima su u kvarclatitu potvrdjeni i elementi sitaste, pojkilitske i glomeroporfirske strukture. Kao fenokristali prisutni su sanidin, plagioklas, kvarc, biotit i amfiboli. Sekundarni minerali su hlorit, epidot, coisit, Fe-hidroksidi, redak kalcit i ilit. U fenokristalima sanidina se zapažaju „lepeze“ izduženih kristala ...
    Grot, kvarclatiti, sanidin, epidot

  • Razvoj integralnog modela za optimizaciju diskontinualnog sistema proizvodnje na površinskim kopovima nemetala

    Miodrag Čelebić (2024)
    Izbor optimalne mehanizacije u diskontinualnom sistemu transporta je jedna od najvažnijih odluka koju treba donijeti prilikom projektovanja površinskih kopova. Pri izboru optimalne mehanizacije, uticaj ima veliki broj faktora, kako prirodnih – geoloških i ekoloških, tako i tehničkih, ekonomskih i socijanih. Neki od njih se mogu izraziti numerički, u određenim mijernim jedinicama, a neki opisno, lingvističkim varijablama, shodno uslovima koji vladaju na rudnim ležištima, a koje karakterišu visok stepen neizvjesnosti i neodređenosti kako prilikom istraživanja, tako i tokom procesa eksploatacije ...
    izbor mehanizacije, tehnologija eksploatacije, diskontinualani sistem, ekspertsko odlučivanje, lingvističke varijable, MCDM, FAHP

  • Epidotized sanidine in quartzlatites from Grot

    Danica Srećković-Batoćanin, Suzana Erić, Nikola Novičić, Nikola Pašajlić, Natalija Batoćanin (2023)
    Propilitska alteracija je veoma česta u gornjokredno-tercijarnim vulkanitima Srbije. Kvarclatiti Grota, otkriveni na dubini od oko 550 m u jednoj od istražnih bušotina su holokristalaste porfirske strukture sa fenokristalima sanidina dimenzija i do 1,5 x 2 cm. Optičkim ispitivanjima su u kvarclatitu potvrdjeni i elementi sitaste, pojkilitske i glomeroporfirske strukture. Kao fenokristali prisutni su sanidin, plagioklas, kvarc, biotit i amfiboli. Sekundarni minerali su hlorit, epidot, coisit, Fe-hidroksidi, redak kalcit i ilit. U fenokristalima sanidina se zapažaju „lepeze“ izduženih kristala ...
    Grot, kvarc latiti, sanidin, epidot

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”

    Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić (2015)
    ... differ- ence between the traverse points; d i i-1 - horizontal length between traverse points (element to be set out); v i i-1 - grid bearing between tra- verse points; β i-1 - direction angle (element to be set out). The coordinates of the start- ing connecting point GIP of the designed mine ...
    ... point; ∆H i i-1 - the altitude difference be- tween points; d i i-1 - the horizontal length between points (element to be set out); z i i-1 - zenith distance between points (element to be set out); i - height of the instrument; l - altitude of the signal. The GIP point level of the mine tra- ...
    ... pre-extraction and extrac- tion stage of the underground deposit mining project. Pre-extraction activity in view of mine surveying includes: - Analysis of the existing geometric base on the terrain surface, stabilization of new geodetic points and determination of their spatial coordinates; - ...

  • Development of integrated fuzzy model for mine management optimization

    Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)
    fuzzy logika, višekriterijumsko odlučivanje, ocenjivanje eksperata
    ... assigned by the decision maker (expert) using the FAHP scale. Step 2. An extent analysis is undertaken of all the elements in the matrix from the previous step. This results in m values of step analyses for each element of set X: ]W;„]Wž, ... ,]W;il, + = 1,2,...,n, where all MŠ„» J = 1,2,...,m are ...
    ... Information sciences, 8, 199—249. Š| CHANG D. Y. (1996) Applications of the extent analysis method on fuzzy AHP, Rur. J. Oper. Res., 95, 649 655. “} ZnU K., Y. JING, D. CHANG (1999) A discussion on extent analysis method and applications of fuzzy AHP, Eur. J. Oper. Res., 116, 450 456. TOLGA FE ...
    ... ria matrices are created relative to alternative solutions, using a fuzzified scale of relative importance and triangular fuzzy numbers [3,5,11]4 Element identification serves to formulate a question for the expert who is examining the problem: “Is a criterion better for pairwise comparison in the ...

  • Security of Supply as a Major Part of the Energy Security Puzzle

    Aleksandar Madžarević, Miroslav Crnogorac (2022)
    Sigurnost snadbevanja prirodnim gasom Republike Srbije se kroz poslednje dve decenije tretira kao hitno, strateško, političko i bezbednosno pitanje. U sektoru prirodnog gasa, Republika Srbija je veoma zavisna od gasa koji uvozi iz Rusije. Indikatori sigurnosti snadbevanja predstavljaju jedan od osnovnih elemenata za određivanje energetske bezbednosti i snažne alate za usmeravanje energetskog sektora ka održivom razvoju. Metodolaška analiza prikazana u radu je bila koncentrisana na pokazatelje sigurnosti snadbevanja u oblasti energetske bezbednosti koji se odnose na sektor prirodnog gasa ...
    energetska bezbednost, sigurnost snabdevanja, energetski indikator, dostupnost energije, diversifikacija izvora i pravaca

  • Hibridni sistem za planiranje i analizu ventilacije rudnika

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilacija rudnika, informacioni sistemi
    ... Reynold’s Equations Prantl’s Theory of Blending Path Standard k-ε Turbulence Model On the Finite Elements Methods…………………………………………………………...75 Finite Elements Approximation The Algorithmic Concept of the Finite Elements Method Application of CFD Software in Solving Mine Chamber Ventilation Problems…… ...
    ... Index About the book Elementi modela Elementi modela su koncepti koji se koriste u dijagramima i svaki element ima definisano značenje i grafičku reprezentaciju. Jedan tip elementa se može pojaviti u više tipova dijagrama, ali postoje pravila koja određuju koji se elementi mogu koristiti u određenom ...
    ... konačnih elemenata Metod konačnih elemenata se koristi pri aproksimaciji parcijalnih diferencijalnih jednačina sistemima običnih diferencijalnih, ili čak algebarskih jednačina. Ovo se postiže diskretizacijom oblasti strujanja konačnim brojem prostih oblasti, koje zovemo elementi (konačni elementi). U okviru ...

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... respectively. Table VI. Concentration of rare earth elements (REE) in μg g-1 for three types of soil obtained by sequential extraction Element Type of soil Element Type of soil La Sand Clay Humus Nd Sand Clay Humus Initial conc. 448.08 447.95 447.97 Initial conc. 527.64 527.44 527.64 Phase I 229 ...
    ... адсорпциона изотерма за елементе лантана, ербијума и гадолинијума на три различита типа земљишта (хумусном, глиновитом и песковитом), док је секвенцијална екстракција, на овим типовима земљишта, примењена за лантан и неодимијум. Испитивана је интеракција појединих елемената ретких земаља са компонентама ...
    ... Trace Rare Earth Analysis) were used for determining Freundlich adsorption isotherm, whereas as the source of neodymium and lanthanum (III)- ions, NdCl3x6H2O (Merck, 99.9 % trace metals basis) and La2(CO3)2 (Sigma- Aldrich, 99.9% trace metals basis, ≤ 1500.0 ppm Trace Rare Earth Analysis) were used for ...

  • Contrastive Analysis of Syntax Patterns in Comparable Football Corpora in Spanish and Serbian Languages

    Jelena Lazarević, Olivera Kitanović (2024.)
    Cilj rada je istraživanje kolokabilnosti kao načina na koji se leksičke jedinice povezuju sa rečima iz različitih kategorija, formirajući veće jedinice. Istraživanje semantičkih i sintaksičkih principa ovih kombinacija u španskom i srpskom jeziku fudbala izvedeno je na komparabilnim fudbalskim korpusima SrFudKo i EsFudko, razvijenim u okviru doktorske disertacije Jelene Lazarević pod nazivom: Jezičke odlike diskursa novih medija o fudbalu: kontrastivna analiza na korpusu srpskog i španskog jezika. Korpus fudbala SrFudKo, kreiran na osnovu tekstova o fudbalu sa pet srpskih veb-portala: ...
    fudbal, korpusi, terminologija, kolokacije, srpski, španski

  • Trace elements and garnet formation in a distal skarn zone: a case study of the Rudnik deposit, Central Serbia

    Bojan Kostić, Pavle Tančić, Natalija Batoćanin (2024)
    geohemija granata, retke zemlje, fluidne inkluzije, skarnovsko ležište Rudnik

  • FrameNet Lexical Database: Presenting a Few Frames Within the Risk Domain

    Aleksandra Marković, Ranka Stanković, Natalija Tomić, Olivera Kitanović (2021)
    U radu se daje kratak prikaz teorije semantike okvira, na kojoj je zasnovana leksička baza Frejmnet. Predstavljena je koncepcija ove mreže, kao i mogućnosti njene primene. Predstavljena je i leksička analiza koja se primenjuje u projektu izrade Frejmneta i ukazano na razlike između analize zasnovane na okviru u odnosu na analizu zasnovanu na reči. Zatim je prikazano nekoliko povezanih okvira koje prizivaju reči iz domena rizika. U radu je predstavljena i platforma NLTК pomoću koje se mogu koristiti ...
    Srpski jezik, semantika okvira, FrameNet, scenario rizika, rudarski korpus, obrada prirodnog jezika
    ... in Berkeley since 1997. 8 Infotheca Vol. 21, No. 1, September 2021 Scientific paper 1.2 Frame semantics lexical analysis Frame semantics based lexical analysis comprises an analysis of the meaning of an LU, its lexical surroundings, phrases and grammatical constructions in which it appears in the ...
    ... formal characteristics that help determine element centrality (e.g. core elements need to be expressed and so do those that have an interpretation even though they are not expressed (e.g. in the sentence John arrived the place where John arrived, the GOAL element, is not expressed but is still interpreted ...
    ... as the possibility of implementing it in Serbian. We also take a close look at the lexical analysis used in the FrameNet development project and point out the differences between the frame-based lex- ical analysis and its word-based counterpart. This is followed by an illustration of a cou- ple of related ...