Претрага
297 items
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On the distribution modulo 1 of the sum of powers of a Salem number
Dragan Stankov (2016)It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "On the distribution modulo 1 of the sum of powers of a Salem number" in Comptes rendus Mathematique (2016). https://doi.org/10.1016/j.crma.2016.03.012
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Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining
... Suggested Method for Determining the Uniaxial Compressive Strength and Deformability of Rock Materials; International Society for Rock Mechanics and Rock Engineering: Lisbon, Portugal, 1979. 24. Radojević, J. Rock Mechanics; University of Belgrade—Faculty of Mining and Geology: Beograd, Serbia, 1992 ...
... can only be determined by laboratory tests carried out on the drilling core samples or block-shaped rock material samples. The results of laboratory testing allow comparison with test results of rock samples from other mines in which bucket-wheel excavators are already operating. A sufficiently accurate ...
... results of rock samples excavated by these machines (Figure 6). σ σ σ σ σ Figure 6. Relationship between cutting resistance, KA, and uniaxial compressive strength, σc, (1—lowest value of KA, 2—highest value of KA). To calculate the cutting resistance of the excavator, values for rock material strength ...Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić. "Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining" in Minerals, MDPI AG (2021). https://doi.org/10.3390/min11060564
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A hundred years of Milutin Milanković's climate change theory - geological implications
Dejan Radivojević (2020)Миланковићева теорија циклуса објављена пре сто година је најважнија теорија у наукама које проучавају климу и имала је велики утицај на дисциплине које се баве Земљом. Ипак, његов рад је чекао више од педесет година да би добио потврду. Може се рећи да Миланковићев рад највећи утицај на геологију има у изради астрономске временске скале, подршци хипотези континенталног дрифта и палеоклиматологији. Добри резултати примене астрономске временске скале на неогене седименте иницирали су примену ове методе у мезозојским и у последње ...циклостратиграфија, астономска временска скала, геолошка временска скала, климатске промене, континентални дрифт... foraminiferal record across the initial Eocene Thermal Maximum, Southern ocean Site 690. GSA Spec. Paper, 369: 319–332. THoMAS, E. 2007. Cenozoic mass extinction in the deep sea; what disturbs the largest habitat on Earth? In: MoNECHI, S., CoCCIoNI, R. & RAMPINo, M. (Eds.). large Ecosystem Pert ...Dejan Radivojević. "A hundred years of Milutin Milanković's climate change theory - geological implications" in Geološki anali Balkanskoga Poluostrva, Univerzitet u Beogradu, Rudarsko geološki fakultet (2020). https://doi.org/10.2298/GABP201125011R
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2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem
... because of this, plastic becomes susceptible to strain (easier to break apart). This process is repeated until plastic gets a low enough molecular mass to be consumed by microorganisms who further whiter away the plastic and convert it to carbon-dioxide. The whole process can last about fifty years ...
... disposed waste, with a smaller part laying on a layer of sand. The base which meanders from 7.5 m to 12 m is composed of marl type rocks. That type of rock is porous but impermeable, in a hydrogeological sense (Šperl and Tročkova, 2008). Water level varies in the range of about 3 m, passing through the ...
... disposed waste. This implies scouting the terrain for favorable conditions (not in contact with a water spring or any underground water, appropriate rock type basis, further enough from housing estates but still a good road connection etc.) and after this the engineering part starts (correct isolation ...Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov. "2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem" in Podzemni radovi, Centre for Evaluation in Education and Science (CEON/CEES) (2019). https://doi.org/10.5937/PodRad1934059S
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An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)
N. Andrić-Tomašević, V. Simić, O. Mandic, D. Životić, M. Suárez, E. García-Romero. "An arid phase in the Internal Dinarides during the early to middle Miocene: Inferences from Mg-clays in the Pranjani Basin (Serbia)" in Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier BV (2020). https://doi.org/10.1016/j.palaeo.2020.110145
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Tehnologija izrade i opremanje magacina eksploziva za potrebe ležišta bakra
Aleksandar Milojević (2024)Nakon radova otvaranja i početka eksploatacije, rudno telo bakra velikih rezervi zahteva i veliku količinu eksploziva da bi se ostvario zacrtan kapacitet. Samim tim, neophodno je izraditi funkcionalan magacin eksploziva koji će biti pristupačan svim horizontima i koji će moći da ispuni celokupni kapacitet svih horizonata. Obzirom da će se u magacinu skladištiti eksploziv, on mora ispunjavati specijalne uslove kako bi skladištenje bilo bezbedno. Neophodno je isprojektovati magacin tako da ispuni sve zahteve po pitanju količine i načina skladištenja eksploziva, ...... Criterion -| 50. mb=6017 s=0.0205 a=0.502 G Ei|30000 —JMPa % Mohr-Coulomb Fit cMW[ _— a cohesion = 2.768MPa · fricton angle = 49.98 deg bad Rock Mass Parameters | Hosk-Brown Ciitetion P tensie strength = -0.238 MPa mb |6.017 uniaxial compressive strength = 9.938 MPa– _—ccC= 42 global strength ...
... —]MPa š 32 UnitWeight|0.023 | MN/m3 5 30 TunnelDepih|540 m Fa Moht-Coulomb Fit 5 2 – |2768 MPa Fal NIO 22 hi |49.38 de phi g 20 -0. Riock Mass Parameters 8 18 sigt [0.238 MPa % - e |[8398 MPa “ FI sigcm |23.853 MPa 42 Š . Em |18951.58 MPa 0. š 10- 8 b 9 a - CopyData I | 6 : : o 6- ...
... kriterijum loma. le File Edit View Analysiss Window ~Help Dp WiA& mxis|m R. R a aR . BL O MB il |6 % % - - Hoek-Brown Classification Analysis of Rock Strength using RocLab sigci|70 —MPa c8 Hoek-Brown Classification |E I 56 intact uniaxial comp. strength (sigci) = 70 MPa 55\65_3 | s GSI=65 mi=21 ...Aleksandar Milojević. Tehnologija izrade i opremanje magacina eksploziva za potrebe ležišta bakra, 2024
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SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian
Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković (2019)У овом раду представљамо модел за избор добрих примера за речник српског језика и развој иницијалних компоненти модела. Метода која се користи заснива се на детаљној анализи различитих лексичких и синтактичких карактеристика у корпусу састављених од примера из пет дигитализованих свезака речника САНУ. Почетни скуп функција био је инспирисан сличним приступом и за друге језике. Дистрибуција карактеристика примера из овог корпуса упоређује се са карактеристиком дистрибуције узорака реченица ексцерпираних из корпуса који садрже различите текстове. Анализа је показала да ...Српски, добри примери из речника, аутоматизација израде речника, издвајање својстава, Машинско учење... scores – from 1 (worst) to 5 (best) – and score our examples using them. This can be performed either by looking at the rules and constructing an equation, or by a trained classifier. 267 Proceedings of eLex 2019 7. Acknowledgements This research was partially supported by Serbian Ministry ...Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković. "SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian" in Electronic lexicography in the 21st century. Proceedings of the eLex 2019 conference , Lexical Computing CZ, s.r.o. (2019)
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Hydrographic and hydrological characterization of the Vodenička and Rosomačka rivers
Vesna Ristić Vakanjac, Marina Čokorilo Ilić, Dušan Polomčić, Dragoljub Bajić, Jelena Ratković (2017)The Visočica River rises in Bulgaria, on the Berovo Mountain. Its course in Bulgaria is 16.7 km long. It enters Serbia near the village of Donji Krivodol. Up to the village of Pakleštica, or the beginning of Lake Zavoj, its right-bank tributaries are the Krivodolštica, the Vodenička, the Rosomačka and the Dojkinačka. There are no left-bank tributaries. Among the tributaries, water levels and discharges are gauged only on the Dojkinačka River. The Vodenička had also been gauged but only ...... the Rosomačka 0.435 m3 /s. The same principle could be applied to arrive at the mean annual discharges of the two rivers. In fact, the following equation was used to calculate the mean annual discharges of the Rosomačka: IzatovacBracevciRosomacka QQQ (m 3 /s) where: RosomackaQ - mean annual ...Vesna Ristić Vakanjac, Marina Čokorilo Ilić, Dušan Polomčić, Dragoljub Bajić, Jelena Ratković. "Hydrographic and hydrological characterization of the Vodenička and Rosomačka rivers" in Pirotski zbornik, Pirot : Narodna biblioteka Pirot (2017). https://doi.org/10.5937/pirotzbor1742001R
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Praktikum za vežbe iz Informatike 1
Ranka Stanković, Ivan Obradović, Olivera Kitanović, Mirjana Banković. Praktikum za vežbe iz Informatike 1, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet, 2014
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Fuzzy Model for Risk Assessment of Machinery Failures
The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...... supply to the diesel engine). This is a seemingly innocuous problem, but it can cause massive problems in the processes of crushing and screening rock mass. The risk of this type of failure can be easily reduced by installing an additional fuel filter. A similar situation can occur from a broken screw ...
... controlled; however, enhanced maintenance measures (regular cleaning to prevent dust and oxidation) can be carried out. For instance, in a crushed rock mass transportation system, it is possible to replace rubber belts on time in order to reduce the number of breakdowns, because the time it takes for ...Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković. "Fuzzy Model for Risk Assessment of Machinery Failures" in Symmetry, MDPI AG (2020). https://doi.org/10.3390/sym12040525
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Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs
Saša Milanović, Ljiljana Vasić (2021)Saša Milanović, Ljiljana Vasić. "Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs" in Hydrogeology Journal, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10040-020-02280-1
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Компарација метода XRF i ICP-MS на узорцима угља и продуктима сагоревања
Бранко Костић, Ксенија Ераковић, Дејан Прелевић, Сабина Ковач, Драгана Животић. "Компарација метода XRF i ICP-MS на узорцима угља и продуктима сагоревања" in Записници Српског геолошког друштва (2023)
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Mineral Resources of Serbia: Environmental, Societal and Economic Challenges
... occurrences was calculated using an exponential trend in equation: \ Yt=a·bi Wherea and b are given constants, and b must be positive. • forcalculation of the variation degree of area size and yield coefficient of variation (C») the following equation was used: C,=oc-·100/ x The coefficient of variation ...
... occurrences was calculated using an exponential trend in equation: Yt=a·b", where a and b are given constants, and b must be positive. • forcalculation of the variation degree of area size and yield (coefficient of variation, C) the following equation was used C,=o·100/ x where o is the standard ...
... soybean seed in the world was annually planted on the average area of 104.43 million ha, and showed an annual growth rate of 2.50%, with little oscillation, Cv=4.17%. Realized soybean areas in 2013 (111.27 million ha) were higher than for all other tested years. The areas recorded stability (Cv =4 ...Vladimir Simić, Rade Jelenković, Dragana Životić. "Mineral Resources of Serbia: Environmental, Societal and Economic Challenges" in Serbia: Current Issues and Challenges in the Areas of Natural Resources, Agriculture and Environment,, Nova Science Publishers, Inc. (2019)
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Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija
Srđan D. Kostić (2013-11-04)U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja... time, perturbation frequencies are similar to the frequency of block oscillation in an unperturbed state. In other words, the reactivation of motion along the fault is possible under the effect of small apmplitude oscillation, with frequencies approximately the same as the frequency of aseismic ...
... geology 30, 1-13. 190 12. Belair, J., Campbell, S.A. 1994. Stability and bifurcations of equilibria in a multiple delayed differential equation, SIAM Journal of Applied Mathematics 54, 1402-1424. 13. Beltrami, H., Mareshal, J. 1993. Strange seismic attractor? Pure and Applied Geophysics ...
... in spring-block model for aperiodicity in earthquakes. Proceedings of 15 th World Conference on Earthquake Engineering, Lisbon, Portugal, USB mass storage, paper No. 0703, 2012. 3. Kostić, S., Franovic, I. Todorovic, K., Vasovic, N.: Deterministic chaos in a model of fault-slip rockburst ...Srđan D. Kostić. "Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-11-04)
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Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija
Srđan D. Kostić (2013-11-04)U ovoj disertaciji, cilj istraživanja bio je određivanje dinamičkih svojstava potresaizazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija.Analiza potresa izvedena je sa dva aspekta – u prvom delu istraživanja izučavane suvremenske serije oscilovanja tla za vreme potresa, a u drugom delu vršena je analizastabilnosti fenomenološkog Baridž-Knopof modela bloka sa oprugom. Vremenske serijeoscilovanja tla proučavane su primenom postupka analize surogat podataka, kao ikorišćenjem metoda analize nelinearnih vremenskih serija (primena teoreme orazvijanju skalarne vremenske serije). Analiza vremenskih serija izvedena je ...potres, naponsko stanje, podzemne prostorije, bifurkacije, vremenskaserija, deterministički haos, stohastičnost, perturbacije, vremensko kašnjenje, jačina trenja... time, perturbation frequencies are similar to the frequency of block oscillation in an unperturbed state. In other words, the reactivation of motion along the fault is possible under the effect of small apmplitude oscillation, with frequencies approximately the same as the frequency of aseismic ...
... geology 30, 1-13. 190 12. Belair, J., Campbell, S.A. 1994. Stability and bifurcations of equilibria in a multiple delayed differential equation, SIAM Journal of Applied Mathematics 54, 1402-1424. 13. Beltrami, H., Mareshal, J. 1993. Strange seismic attractor? Pure and Applied Geophysics ...
... in spring-block model for aperiodicity in earthquakes. Proceedings of 15 th World Conference on Earthquake Engineering, Lisbon, Portugal, USB mass storage, paper No. 0703, 2012. 3. Kostić, S., Franovic, I. Todorovic, K., Vasovic, N.: Deterministic chaos in a model of fault-slip rockburst ...Srđan D. Kostić. "Nelinearno dinamičko modelovanje potresa izazvanih promenom naponskog stanja pri izradi horizontalnih podzemnih prostorija" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2013-11-04)
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Using Lexical Resources for Irony and Sarcasm Classification
The paper presents a language dependent model for classification of statements into ironic and non-ironic. The model uses various language resources: morphological dictionaries, sentiment lexicon, lexicon of markers and a WordNet based ontology. This approach uses various features: antonymous pairs obtained using the reasoning rules over the Serbian WordNet ontology (R), antonymous pairs in which one member has positive sentiment polarity (PPR), polarity of positive sentiment words (PSP), ordered sequence of sentiment tags (OSA), Part-of-Speech tags of words (POS) ...... Detecting Irony in User-generated Contents: Oh...!! It’s so easy;-). In Proc. of the 1st international CIKM workshop on Topic-sentiment analysis for mass opinion. ACM, 53–56. [9] Paula Carvalho, Luís Sarmento, Jorge Teixeira, and Mário J Silva. 2011. Liars and Saviors in a Sentiment Annotated Corpus ...Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković. "Using Lexical Resources for Irony and Sarcasm Classification" in Proceedings of the 8th Balkan Conference in Informatics (BCI '17), New York, NY, USA, : ACM (2017). https://doi.org/
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Softverski alati za korišćenje resursa za srpski jezik
Ivan Obradović, Ranka Stanković (2008)... électroniques du français. Langue française 87, Paris, Larousse. Fellbaum, C. (ed.). (1998): WordNet: An Electronic Lexi- cal Database, Cambridge, Mass. MIT Press. Francopoulo G., Bel N., George M., Calzolari N., Mo- nachini M., Pet M., Soria C. (2006) “Lexical Markup Framework (LMF) for NLP Multilingual ...Ivan Obradović, Ranka Stanković. "Softverski alati za korišćenje resursa za srpski jezik" in INFOteka: časopis za informatiku i bibliotekarstvo, Belgrade, Serbia : Zajednica biblioteka univerziteta u Srbiji (2008)
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Генеза хидротермалног Cu-Au система Чукару Пеки (Источна Србија)
Милош Велојић (2021)Главни циљ испитивања хидротермалног система Чукару Пеки је разумевање процеса који су довели до његовог настанка, а посебно еволуције рудоносних флуида из којих је настала рудна минерализација. Утврђено је да је овај систем настао у периоду пре 86,78 - 85,19 Ma из магматског интрузива који је био богат водом и имао висок оксидативни потенцијал. Током хлађења, из овог магматског интрузива су издвојени веома врели флуиди, који су имали температуре изнад 600°С и висок салинитет. У ...Борска металогенетска зона, Тимочки магматски комплекс, порфирска лежишта, високосулфидациона лежишта, флуидне инклузије, рудне парагенезе, геохронологија, хидротермалне алтерације, LA-ICP-MS... plasma mass spectrometry technique, International Journal of Analytical Atomic Spectrometry, 17 , 406–409. 147. Woodhead, J., Hellstrom, J., Hergt, J., Greig, A. & Maas, R., 2007. Isotopic and elemental imaging of geological materials by laser ablation Inductively Coupled Plasma mass spectrometry ...
... факултет, Београд, 121 стр. ГЕНЕЗА ХИДРОТЕРМАЛНОГ Cu-Au СИСТЕМА ЧУКАРУ ПЕКИ (ИСТОЧНА СРБИЈА) 98 15. Bodnar, R.J., 1993. Revised equation and table for determining the freezing point depression of H2O-NaCl solutions. Geochimica et Cosmochimica Acta, 57, 683-684. 16. Bodnar, R.J. ...
... елемената је коришћен синтеровани спрашени пелет референтни материјал MUL-ZnS 1 (Onuk et al., 2017), док је спрашени полисулфидни референтни материјал MASS-1 из USGS-а коришћен за квалитативну контролу анализа (Wilson et al., 2002). Обрада података је извршена коришћењем Iolite V3.1 софтвера (Woodhead ...Милош Велојић. Генеза хидротермалног Cu-Au система Чукару Пеки (Источна Србија), Београд : [М. Велојић], 2021
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Assessments of effects of implementation of strategic plans for development of Belgrade District heating system
The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić. "Assessments of effects of implementation of strategic plans for development of Belgrade District heating system" in Sustainable Cities and Society, Elsevier BV (2020). https://doi.org/10.1016/j.scs.2020.102304
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Multihazard Exposure Assessment on the Valjevo City Road Network
Miloš Marjanović, Biljana Abolmasov, Svetozar Milenković, Uroš Đurić, Jelka Krušić, Mileva Samardžić Petrović (2019)Miloš Marjanović, Biljana Abolmasov, Svetozar Milenković, Uroš Đurić, Jelka Krušić, Mileva Samardžić Petrović. "Multihazard Exposure Assessment on the Valjevo City Road Network" in Spatial Modeling in GIS and R for Earth and Environmental Sciences, Elsevier Inc (2019). https://doi.org/10.1016/B978-0-12-815226-3.00031-4.