Претрага
344 items
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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). ...... major and trace elements, especially po tentially toxic and radioactive ones, are of great importance, if coal is used for combustion in a TPP. Many studies of trace ele ments contained in coal have been carried out in order to under stand and evaluate their mode of occurrence, as well as their behaviour ...
... of occurrence of trace elements may control po tential hazardous effects to human health (FINKELMAN et al., 2002) and the environment. Numerous studies performed in SE Europe on Greek (CHATZIAPOSTOLOU et al., 2006; GENTZIS et al., 1996, 1997; GEORGAKOPOULOS, 2001; FILIPPIDIS et al., 1996; FOSCOLOS ...
... Kostolac coal basin, began in the late 19th century. The Upper Miocene (Pontian) age of the coalbearing sediments was confirmed by palaeontological studies (PAV LO VIĆ, 1959; SPAJIĆMILETIĆ, 1960, 1969; STEVANOVIĆ, 1951). The distribution of palynomorph assemblages in the lignite from the EEF field ...Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović. "Distribution of major and trace elements in the Kovin lignite (Serbia)" in Geologia Croatica, Croatian Geological Survey (2019). https://doi.org/10.4154/gc.2019.06
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Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event
Barbara V. Radulović, Lubomir S. Metodiev, Neda Motchurova-Dekova, Platon Tchoumatchenco. "Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event" in Historical Biology (2023). https://doi.org/10.1080/08912963.2023.2190757
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Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept
Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov. " Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept" in Engineering Geology , Elsevier (2019). https://doi.org/10.1016/j.enggeo.2019.05.007
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Sorpcija herbicida na neorganski i organski modifikovanom prirodnom montmorionitu iz Bogovine
Lazar M. Kaluđerović (2018-01-17)fikasnost prilikom sorpcije S-metolahlora i klomazona od strane neorganskih iorganski modifikovanih montmorionita sa lokaliteta Bogovina odreĎena je metodombach adsorpcije. Uzorci montmorionita su tretirani prvo rastvorom NaCl a zatim irazličitim koncentracijama organskih kompleksa. Adsorpcione izoterme su dobijenetretiranjem uzoraka različitim koncentracijama herbicida. Detaljna mineraloškakarakterizacija uzoraka uraĎena je metodom rendgenske difrakcije. Rezultati interakcijemontmorionita sa organskim kompleksima i herbicidima dobijeni su primenomrendgenskih, optičkih, termičkih i spektroskopskih metoda.Na osnovu rezultata rendgenskih ispitivanja uzoraka, utvrĎeno je prisustvoorganskih kompleksa i herbicida u meĎuslojnom prostoru montmorionita.Montmorioniti modifikovani ...adsorpcija, montmorionit, heksadeciltrimetilamonijum bromid,feniltrimetilamonijum hlorid, S-metolahlor, klomazon... Magazine, 28: 36-44. Madejova J., Komadel P. 2001. Baseline studies of clay minerals society source clays: Infrared methods. Clays and Clay Minerals, 49(5): 410–432. Madejova J. 2003. FTIR techniques. Review in clay mineral studies. Vibrational Spectroscopy, 31: 1–10. Madejova J. PalkovaH. ...
... waste containment. Organic Substances and Sediments in Water, 11(1): 181–200. Brindley G. W., Souza Santos P., Souza Santos H. 1963. Mineralogical studies of kaolinite-halloysite clays: Part I, Identification problems. American Mineralogist, 48: 897–910. Bujdak J., Slosiarikova H., Novákova L., ...
... montmorillonite– beidellite–nontronite type of clay minerals. Soil Science, 47: 1–14. Giles C. H., MacEwan T. H., Nakhwa S. N., Smith D. 1960. Studies in adsorption: Part XI. A system of classification of solution adsorption isotherms, and its use in 139 diagnosis of adsorption mechanisms ...Lazar M. Kaluđerović. "Sorpcija herbicida na neorganski i organski modifikovanom prirodnom montmorionitu iz Bogovine" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2018-01-17)
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Building learning capacity by blending different sources of knowledge
... of video and audio lectures, printed course materials and the like, and enterprises use similar forms to offer expert knowledge, such as case studies or presentations of industrial software implementation in practice. The abovementioned approach is being realized within the BAEKTEL (Blending ...Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić. "Building learning capacity by blending different sources of knowledge" in International Journal of Learning and Intellectual Capital (2016). https://doi.org/10.1504/IJLIC.2016.075698
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Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation
Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović. "Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation" in Thermal Science, National Library of Serbia (2023). https://doi.org/10.2298/TSCI220813168I
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Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation
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... (2014) for the interpretation of current day global deformation rates. For large strains this ratio no longer applies, as we show in Section 2.7. Studies have used derived quantities as maximum shear strains (Cruz et al. 2008) or vorticity (Adam et al. 2005) to resolve shear strain in vertical model ...
... principal strains γ max = ǫ1 − ǫ2, or principal stretches γ max = λ1 − λ2. Dilatation, area change, is the product of the principal stretches. In some studies the dilatation is represented by the divergence of the displacement field (Galland et al. 2016; Schellart et al. 2019) (i.e. ǫxx + ǫyy). This can ...
... and off-diagonal components of the strain tensor are communicative, and vary according to the reference orientation. Often in analogue modeling studies, strain is interpreted by inspecting individual strain tensor components, to derive extensional D o w n lo a d e d fro m h ttp s ://a c a d ...Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer. "Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation" in Geophysical Journal International, Oxford University Press (OUP) (2021). https://doi.org/10.1093/gji/ggab120
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A Data Driven Approach for Raw Material Terminology
Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja (2021)The research presented in this paper aims at creating a bilingual (sr-en), easily searchable, hypertext, born-digital, corpus-based terminological database of raw material terminology for dictionary production. The approach is based on linking dictionaries related to the raw material domain, both digitally born and printed, into a lexicon structure, aligning terminology from different dictionaries as much as possible. This paper presents the main features of this approach, data used for compilation of the terminological database, the procedure by which it has ...sirovine, rudarstvo, terminologija, rečnik, terminološka aplikacija, mobilna aplikacija, digitizacija, leksički podaci, korpusi, otvoreni povezani podaci... bg.ac.rs (M.Š.); ljiljana.kolonja@rgf.bg.ac.rs (L.K.) 2 Department for Informatics and Computing, University of Criminal Investigation and Police Studies, 11000 Belgrade, Serbia; ivan.babic@mup.gov.rs * Correspondence: olivera.kitanovic@rgf.bg.ac.rs; Tel.: +381-11-3219-212 † These authors contributed ...
... .bg.ac.rs (M.S.); ljiljana-kolonja@ref.bg.ac.rs (L.K.) Department for Informatics and Computing, University of Criminal Investigation and Police Studies, 11000 Belgrade, Serbia; ivan.babic@mup.gov.rs * Correspondence: olivera.kitanovic@rgf.bg.ac.rs; Tel.: +381-11-3219-212 t+ These authors contributed ...Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja. "A Data Driven Approach for Raw Material Terminology" in Applied Sciences, MDPI AG (2021). https://doi.org/10.3390/app11072892
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Polymorphism and photoluminescence properties of K3ErSi2O7
alkalni silikati elemenata retkih zemalja, silikati lantanoida, polimorfizam, fotoluminescencija, kristalna strukturaPredrag Dabić, Marko G. Nikolić, Sabina Kovač, Aleksandar Kremenović. "Polymorphism and photoluminescence properties of K3ErSi2O7" in Acta Crystallographica Section C Structural Chemistry, International Union of Crystallography (IUCr) (2019). https://doi.org/10.1107/S2053229619011926
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Threshold-induced correlations in the Random Field Ising Model
... original avalanche triggerings are described by a random uncorrelated process. �e Random Field Ising model (RFIM)1,2 has a great signi�cance for studies of the e�ect of disorder in the ferro- magnetic hysteresis3 and the Barkhausen e�ect4–7. In athermal (T = 0) and nonequilibrium case, the model has ...
... triggerings are described by arandom uncorrelated process. Received: 3 January 2018 The Random Field Ising model (RFIM)’” has a great significance for studies of the effect of disorder in the ferro- magnetic hysteresis’ and the Barkhausen effect*. In athermal (T= 0) and nonequilibrium case, the model has ...Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević. "Threshold-induced correlations in the Random Field Ising Model" in Scientific Reports, Springer Science and Business Media LLC (2018). https://doi.org/10.1038/s41598-018-20759-6
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Еоценска фауна југозападног дела Сирт басена (Либија)
Љупко Рундић, Мери Ганић (2020)Љупко Рундић, Мери Ганић. "Еоценска фауна југозападног дела Сирт басена (Либија)" in Записници Српског геолошког друштва, Српско геолошко друштво (2020)
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Extraction of Bilingual Terminology Using Graphs, Dictionaries and GIZA++
Branislava Šandrih, Ranka Stanković (2020)U nauci, industriji i mnogim istraživačkim oblastima, terminologija se brzo razvija. Najčešće, jezik koji je „lingua franca“ za većinu ovih oblasti je engleski. Kao posledica toga, za mnoga polja termini domena su koncipirani na engleskom, a kasnije se prevode na druge jezike. U ovom radu predstavljamo pristup za automatsko izdvajanje dvojezične terminologije za englesko-srpski jezički par koji se oslanja na usaglašeni dvojezični korpus domena, ekstraktor terminologije za ciljni jezik i alat za usklađivanje delova. Ispitujemo performanse metode na domenu ...... Garab́ık, Radovan and Ludmila Dimitrova. “Extraction and Presentation of Bilingual Correspondences from Slovak-Bulgarian Parallel Corpus”. Cog- nitive Studies | Études cognitives no. 15 (2015): 327–334 Hakami, H. and D. Bollegala. “A Classification Approach for Detecting Cross-lingual Biomedical Term T ...Branislava Šandrih, Ranka Stanković. "Extraction of Bilingual Terminology Using Graphs, Dictionaries and GIZA++" in Infotheca, Faculty of Philology, University of Belgrade (2020). https://doi.org/10.18485/infotheca.2019.19.2.6
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A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System
This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFISMiljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić. "A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System" in Energies, MDPI AG (2023). https://doi.org/10.3390/en16072958
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BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations
Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina. "BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations" in 17th International Conference of the open and underwater mining of minerals, Sts. Constantine and Helena Resort, Varna, 18-22 September, Bulgaria, Sofia, Bulgaria : Scientific and Technical Union of Mining, Geology and Metallurgy, (2023)
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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... Kristallogr 96:7-14. Su, Y., Balmer, M.L. and Bunker, B.C. (2000) Raman Spectroscopic Studies of Silicotitanates. J Phys Chem B 104: 8160-8169. Shannon R.D. (1976) Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallogr A 32: 751-767 ...
... Mechanical Alloying. Mater Sci Forum 1: 88-90. Bismayer U., Schmahl W., Schmidt C. and Groat L.A. (1992) Linear Birefringence and X-Ray Diffraction Studies of the Structural Phase Transition in Titanite, CaTiSiO5. Phys Chem Miner 19: 260-266. Bladh K.W., Corbett R.K., McLean W.J., and Laughon R.B ...
... физички и физичко-хемијски основи. Серија Наyка о материјалима бр. 2. Ниш, Електронски Факултет Универзитета. Kim K.H. and Hummel F.A. (1959) Studies in lithium oxide systems: VI, progress report on the system Li2O-SiO2-TiO2. Am Ceram Soc 42: 286-291. Knoche R., Angel R.J., Seifert F. and Fliervoet ...Jelena R. Pantić. "Синтеза и карактеризација керамике на бази сфена" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2015-07-10)
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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... Kristallogr 96:7-14. Su, Y., Balmer, M.L. and Bunker, B.C. (2000) Raman Spectroscopic Studies of Silicotitanates. J Phys Chem B 104: 8160-8169. Shannon R.D. (1976) Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallogr A 32: 751-767 ...
... Mechanical Alloying. Mater Sci Forum 1: 88-90. Bismayer U., Schmahl W., Schmidt C. and Groat L.A. (1992) Linear Birefringence and X-Ray Diffraction Studies of the Structural Phase Transition in Titanite, CaTiSiO5. Phys Chem Miner 19: 260-266. Bladh K.W., Corbett R.K., McLean W.J., and Laughon R.B ...
... физички и физичко-хемијски основи. Серија Наyка о материјалима бр. 2. Ниш, Електронски Факултет Универзитета. Kim K.H. and Hummel F.A. (1959) Studies in lithium oxide systems: VI, progress report on the system Li2O-SiO2-TiO2. Am Ceram Soc 42: 286-291. Knoche R., Angel R.J., Seifert F. and Fliervoet ...Jelena R. Pantić. "Синтеза и карактеризација керамике на бази сфена" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2015-07-10)
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Методологија интегралне анализе сценарија енергетског развоја
Александар Маџаревић (2019)енергетска безбедност, сценарио развоја, фази логика, сигурност снабдевања, доступност, расположивост, природни гас... Behrens, A., Egenhofer, C., Long-term energy security risks for Europe: a sector-specific approach (Working document), Centre for European Policy Studies, Brussels, 2009 Jansen, J.C., Seebregts, A.J., Long-term energy services security: what is it and how can it be measured and valued?, Energy Policy ...
... .com/science/article/pii/S0301421509000640 Lisiakiewicz R., Poland's conception of European security and Russia, Communist and Post-Communist Studies, Article in press, 2018., доступно на: https://www.sciencedirect.com/science/article/pii/S0967067X18300199 Bouwmeester M.C., Oosterhaven J., Economic ...
... w.sciencedirect.com/science/article/pii/S0030438718300085 Tsygankov, A.P., The sources of Russia's fear of NATO, Communist and Post- Communist Studies, Article in press, 2018, доступно на: https://www.sciencedirect.com/science/article/pii/S0967067X18300205 Baumgarten natural gas hub, Gas Connect ...Александар Маџаревић. Методологија интегралне анализе сценарија енергетског развоја, Рударско-геолошки факултет, 2019
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Laboratory testing of fly ash
Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction... l 2.1 Mineral properties of fly ash Mineral properties of samples of fly ash from thermal plant PPNT A production were determined by X-ray studies at the Laboratory of Crystallography Faculty of Mining - Geology in Belgrade. X-ray diffraction is a non- destructive experimental method based on ...Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić. "Laboratory testing of fly ash" in Tehnički vijesnik (2016). https://doi.org/10.17559/TV-20150317171035
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A WebGIS Decision Support System for Management of Abandoned Mines
Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)... two subgroups can be distinguished within the first group, namely: (a) abandoned mines with legal deposits, for which geological research projects, studies on reserves and mining projects exist; and (b) abandoned mines where illegal mining took place. Available data for the Energies 2016, 9, 567; doi:10 ...Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis. "A WebGIS Decision Support System for Management of Abandoned Mines" in Energies 7 no. 9 (2016): 567. https://doi.org/10.3390/en9070567
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Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit
... for variable R. Here it is necessary that h is a small number, which is not the case with blasting operations in mining engineering. Previous studies have shown that the value of the parameter n moves principally in the interval from 1 to 3, most often at an interval from 1 and 2. To determine ...Suzana Lutovac, Nebojša Vidanović, Čedomir Beljić, Zoran Gligorić. "Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit" in Mining and Metallurgy Engineering Bor, Bor : Mining and Metallurgy Institute Bor (2015). https://doi.org/10.5937/MMEB1503053L