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346 items

  • Анализа одрона у стенским косинама: савремени приступи

    Милош Марјановић (2023)
    У Србији и региону познате су бројне појаве одрона које су изазвале велике застоје саобраћаја, материјалне штете или чак имале фаталне исходе, па их је потребно непрестано пратити и изучавати. Mодeловањe одрона скопчано је са ниским нивоом поузданости, али савремене технологије омогућавају да сe такви изгледи донекле побољшају. Једна од технологија која чини искорак утом правцу јe LiDAR-ско скенирање, које обезбеђује детаљне топографске подлоге у виду облака тачака високе резолуције и тачности. Поступак анализе одрона може се свести на: ...
    одрони, осматрање, LiDAR, облак тачака, моделовање

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... ways it is a terminological system. It focuses not only on the classification of the geologic material, but also on very precisely defined terms that are used to de- scribe the properties of that material, including its genesis. The terminology of the geological Survey of canada, originally developed ...
    ... developed independently of others (Struik, et. al., 2002) features a strict petro- logic classification of rock material together with the properties collected from different, primar- ily cartographic documents. This is how a simple search, comparison and grouping of rocks or the units where they are ...
    ... analytical requirements of comparison, correlation, grouping and searching geologic similarities and differences, details and unique features of rock material, geological units and structures call for assigning the central role to terminology in the information system; • older, inherited terminology ...

  • The ‘Umka’ landslide

    Uroš Đurić, Dragana Đurić, Miloš Marjanović, Biljana Abolmasov, Ivana Vasiljević (2024)
    We present an in-depth landslide map of the ‘Umka’ landslide near Belgrade, Serbia, at a scale of 1:5000. The map delineates elements at risk, primarily buildings and road infrastructure impacted by the landslide displacements of several cm per year, introduced during frequent reactivation stages. The Main map results from a survey of over 350 buildings and more than 7 km of state and local roads. The acquisition techniques included engineering geological field mapping, building survey, and visual interpretation of ...
    rizik od klizišta, elementi rizika, kartiranje pomoću drona, ispitivanje objekata, geotehnički monitoring

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... PK "Drmno". The maximum length is 2 km, width 1.2 km and height 50 m. The landfill slopes have been reclaimed. The thickness of bulk overburden material is 40-50 m. The area belongs to “Drmno” open pit is in the eastern part of the Kostolac coal basin, 1.e., east of the Mlava River. (Figure 1) igure ...
    ... community, thus solving several problems: eliminating the risk of sliding of positive relief forms occurring in a territory by depositing the sterile material in the external waste dumps; the elimination of the negative visual impact; the need to reintegrate the degraded areas into the productive and/or ...
    ... research, application of the sands, which would be the reclamation friendly and neutral for the natural environment, application of the proper material management — soil, leguminous mixtures, seedlings, etc. optimization of the existing: reclamation methods by introduction of improvements and new ...

  • Analysis of the Influence of Burden Deviation from the Designed One on the Intensity of the Blast Vibration

    Stefan Milanović, Lazar Kričak, Milanka Negovanović, Nikola Simić, Jovan Marković, Nikola Đokić (2023)
    This paper presents an analysis of the influence of burden deviation from the designed one on the intensity of blasting vibrations through the use of laboratory and field examinations. By definition, the burden represents the shortest distance from the axis of an explosive column charge to the free surface. It should be measured along the entire hole length, although, in practice, it is often measured only on the bench surface as the shortest distance from the axis of the ...
    linija najmanjeg otpora, 3D model, miniranje, potresi usled miniranja, slobodna površina

  • Hidrogeologija ležišta bakra i zlata Čukaru Peki – od istraživanja do eksploatacije

    Nebojša Atanacković, Vladimir Živanović, Veselin Dragišić, Jelena Davidović (2022)
    Podzemne vode, Mineralne sirovine, Rudnička hidrogeologija, Odvodnjavanje rudnika, Timočki magmatski kompleks

  • Substitution reactions of some novel sterically hindered monofunctional Pd(II) complexes

    Aleksandar Mijatović, Jovana Bogojeski, Biljana Petrović, Živadin D. Bugarčić (2011)
    Reakcije supstitucije monofunkcionalnih kompleksa [(TLtBu)PdCl]+ i [Pd(tpdm)Cl]+, gde je TLtBu = 2,6-bis[(1,3-di-terc-butilimidazolin-2-imino)metil]piridin i tpdm = terpiridindimetan, sa nukleofilima kao što su: tiourea, I−, Br−, NO2−, piridin i dimetil-sulfoksid (DMSO) proučavani su u 0,1 M vodenom rastvoru NaClO4 u prisustvu 10 mM NaCl. Reakcije su sprovedene na tri različite temperature (288, 298 i 308 K) korišćenjem tehnike zaustavljenog protoka na različitim temperaturama. Reakcije supstitucije su praćene pod uslovima pseudo prvog reda sa velikim viškom nukleofila. Dobijeni rezultati pokazuju da kompleks ...
    Materials Chemistry, Inorganic Chemistry, Physical and Theoretical Chemistry
    ... average value from four to eight independent kinetic runs using the program ORIGINPRO 8. Experimental data are reported in Tables S1–S11 (Supplementary material). 3. Results and discussion Substitution reactions of the [(TLtBu)PdCl]+ and [Pd(tpdm)Cl]+ complexes proceeds according to Scheme 1. Substitution ...
    ... [(TLtBu)PdCl]+ and [Pd(tpdm)Cl]+ complexes are summarized in Table 1. Representative plots are shown in Figs. 2–5 (others are given in Supplementary material, Figs. 1S–7S). As can be seen in all cases kobs, depends linearly of the entering ligand concentration. According on the values of k2, from the Table ...
    ... average value from four to eight independent kinetic runs using the program oricinpro 8. Experimental data are reported in Tables S1-S11 (Supplementary material). 3. Results and discussion Substitution reactions of the [(TL®")PdCl]* and [Pd(tpdm)Cl]* complexes proceeds according to Scheme 1. Substitution ...

  • Preparation of Multimedia Document “YU Rock Scene”

    Milena Obradović, Aleksandra Arsenijević, Mihailo Škorić (2017)
    SUMMARY: This study will present the preparation process of a multimedia document entitled YU ROCK SCENE in which participants were senior students of undergraduate studies of the Department of Library and Information Science at the University of Belgrade Faculty of Philology during the academic year 2014/2015, as a part of the subject Multimedia Documents. This study gives an overview of the historical development of rock and roll in the territory of the former Yugoslavia, rock scene in Yugoslav republics, ...
    multimedia document, library science, information science, rock and roll, music, Yugoslavia
    ... of the former Yugoslavia, rock music was least developed in Montenegro. The reasons were numerous, but the most important ones include cultural and material aspects, and the fact that it was difficult at the time to purchase good musical instruments at affordable prices. Still, there were tendencies for ...
    ... periodicals libraries and primary and secondary monographic sources. Rest 120 Infotheca Vol. 16, No. 1–2, August 2016 Professional paper of the material – photos, audio tracks and videos were found either in cultural and media institutions (libraries, archives, radio stations, television networks, ...
    ... filmography (Aleksandra Arsenijević and Jelena Radić) and controversies (Vladana Nešović and Uroš Timić). After the gathering of information and material was completed, it was supposed to be processed, systematized and displayed in a desired manner. Mihailo Škorić and Petar Popović got that job. ...

  • Petrološke karakteristike dunavskog šljunka (Beograd – Zemun)

    Miloš Mihajlović (2024)
    Dunavski šljunak u okolini Zemuna karakterističan je za obalne rečne naslage formirane dugotrajnim procesima erozije i transporta materijala koje reka Dunav nosi sa različitih područja uzvodno. Ispitivanja šljunka sa lokacije „Gemax” su pokazala je šljunak uglavnom zaobljen, najčešće u rasponu od nekoliko milimetara do nekoliko centimetara u prečniku. Kako Dunav nosi materijal sa velikog sliva, ovaj šljunak sadrži raznovrsne sastojke sa dominacijom kvarca i odlomaka stena visokosilicijskog sastava. Mineraloško-petrografska ispitivanja pokazala su prisustvo klasta različitog sastava, čime je potvrđena ...
    Dunav, šljunak, mineraloško-petrografska ispitivanja, građevinarstvo
    ... n test (optional) 2 drysamplemethod 8 - soakingand stirring 14 dryingretained material 3 riffhingorquarterng 9 ~ dry separation (alternative method) 15 sieving. 4 drying 10 separating and washing 16 weighing material on each sieve 5 moistsamplemethod 11 washings 17 testresuht calculations 6 weighing ...
    ... that the gravel is mostly rounded, typically ranging in size from a few millimeters to several centimeters in diameter. As the Danube carries material from a large catchment area, this gravel contains a variety of components, with a dominance of quartz and fragments of high-silica rocks. Min ...
    ... revealed the presence of clasts with different compositions, confirming its heterogeneity. This gravel is often used in construction, as a decorative material in landscaping yards and parks, as well as in aquaristics due to its neutral chemical nature. The Danube gravel in the Zemun area is particularly ...

  • 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
    ... object. However, the association of two brittle materials, i.e., a composite material, can give rise to a nonbrittle material which can resist fracture [1-3]. Defects no longer determine the ultimate strengith of such a material, and it becomes possible to predict the strength that these materials will ...
    ... richer in asbestos fibers, in accordance with the XRPD results (Figure 5, see further). These differences could arise from the use of different raw materials and/or different relative amounts of fibers and clay used in the preparation and also from different degrrees of reaction/transformation ...
    ... analysis has only been conducted to assess potential domestic uses (food residues). Materials 2020, 13, 3597 14 of 18 4. Conclusions Two types of raw materials have been identified in these archaeological asbestos-fiber-reinforced ceramic matrix composites, confirming the ethnological classification ...

  • BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties

    Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković (2023)
    To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ...
    ferroelectric, dielectric properties, magnetic properties, titanate/ferrite composites, phase composition
    ... as low conductivity and ideal-like hysteresis loop behavior. The favorable properties of BaTiOy/NiFe>Ou make this particular composite an ideal material choice for further studies on applications of multi-ferroic devices. Keywords: ferroelectric; dielectric properties; magnetic properties; titan ...
    ... case of samples sintered at 1300 "C, in the high-temperature range, the values of high-frequency tangent loss increased due to the defects in the material, including oxygen vacancies and transformation of BaTiOa from P4mm to P4/mmm space group, Figure 9. From the AC Tnorganics 2023, 11, 51 11 of ...
    ... ferrites. The P-E loops for all sintered samples at a fixed frequency of 100 Hz and electrical ield of 10 kV/cm are given in the Supplementary material (Figure S1), while a typical hysteresis curve for sample BaTiOy /NiFe>Ou sintered at 1150 "C at the fields of 20 kV/cm is presented in Figure ...

  • 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

  • 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
    ... clast spectrum of the re-sedimented rocks (Blatt 1967; Zuffa 1980, 1985; Lewis 1984). Whereas the detailed provenance analyses of siliciclastic material is common, provenance analyses of carbonate or radiolarite clasts in conglomerates or breccias remain rare (Gawlick et al. 2008, 2009a, 2015 ...
    ... clearly indicate, that 1) the deposition of the ophiolitic mass transport deposits on top of a carbonate- clastic trench-like basin fill with material from the back-reef to fore-reef facies belt of the destroyed Triassic-Jurassic passive margin of Adria took place in late Middle to early Late ...
    ... from the ophiolite suite it contains several radiolarite components from the original sedimentary cover of the ocean floor. Sampled sites, material and methods Beside a lot of outcrops of the ophiolitic mćlange south of the study area the outcrops between Rožanstvo and Trnava near Ilidža ...

  • Application of Expansive Mortars for the Formation of Artificial Screens During Blasting in Urban Areas

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Nikola Simić, Jelena Majstorović (2024)
    During construction of buildings in urban areas, sometimes there is a need to blast solid rock mass in the immediate vicinity of the surrounding buildings. In that case, the aim is not only to increase the efficiency of blasting, but also to reduce harmful effects of ground vibration induced by blasting. At the same time, it is very important to protect the buildings located in the safe zone from the blast site as well as remaining rock mass around ...
    expansive mortar, artificial screens, pressure, rock breaking, building foundation

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • Frequency and Length of Syllables in Serbian

    Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)
    Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.
    frekvencije slogova, dužina slogova, srpski jezik
    ... some properties of Serbian phonology that are relevant for syllabification, and the Serbian alphabets (both Latin and Cyrillic). Then, the language material used is introduced. In Section 4, mathematical models for syllable properties under study (the rank-frequency distribution, the distribution of ...
    ... sonority. 13 E.g. Berber languages can be problematic, see Ridouane (2008). Frequency and Length of Syllables in Serbian 117 3. Language material Serbian is a South Slavic language. It has the official status in Serbia (exclusively) and in Bosnia and Herzegovina (as one of three languages ...
    ... 16 Parameters values are not directly comparable, as the Zipf-Mandelbrot distribution is not a good model for word frequencies in the language material we used (𝐶 = 0.0880). Given that we work with a complete novel consisting of 110104 words, it is necessarily a text mixture rather than a homogeneous ...

  • Development of an integrated model for open-pit-mine discontinuous haulage system optimization

    Miodrag Čelebić, Dragoljub Bajić, Sanja Bajić, Mirjana Banković, Duško Torbica, Aleksej Milošević , Dejan Stevanović (2024)
    equipment selection, mine mechanization, expert judgment, linguistic variables, MCDM, FAHP

  • Funkcionisanje i uticaj epikarsta na režim, bilans i kvalitet podzemnih voda istočnog dela karstnog sistema Suve planine

    Branislav Z. Petrović (2020)
    Epikarst je deo karstne izdani koji se nalazi u okviru nadizdanske zone i predstavlja kompleksnu tačku dodira i mešanja nekonsolidovanog materijala sa površine terena, ostataka karbonatnih stena izmenjenih korozivnim delovanjem vode, živog sveta i njihovih ostataka, koja je delimično zasićena podzemnom vodom. Kompletan sud o stepenu razvoja i prisustva epikarsta na nekom krečnjačkom terenu moguće je doneti uz multidisciplinarna i obavezna detaljna hidrogeološka istraživanja. Poligon za sprovedena istraživanja je bio karstni masiv Suve planine, koja u geološkom i geografskom smislu ...
    epikarst, karstni sistem, podzemne vode, procesi samoprečišćavanja, hidrohemijski i mikrobiološki procesi u podzemnoj vodi

  • Верификација етажних транспортера на угљеном систему – површински коп Дрмно

    Тамара Андрејевић (2024)
    У савременом рударству, површински копови угља наилазе на различите проблеме које треба превазићи зарад добијања потребне количине угља. Као највећи потрошачи овог енергента јављају се термоелектране, где на основу овога можемо да закључимо колико су блиско повезани добра и континуирана производња на површинском копу и рад термоелектрана. Са циљем да се обезбеди стабилна и континуирана производња, потребно је да се направи добар одабир транспортера. У овом раду, за потребе верификације затезне чврстоће траке и снаге погона транспортера, коришћен је ...
    транспортна трака, снага погона, затезна чврстоћа, угаљ, Дрмно, Helix
    ... Andrejevic ConveyorNo. U--1 Design Date 20 March 2024 [7] Conveyed Material Material Description Ugalj Drmno Surcharge Angle. 15 deg Low Bulk Density 960 kg/m3 Angle of Repose 30 deg High Bulk Density 960 kg/m3 Material Lump size 200 mm Conveyor Data Conveying Distance 1605.18 m Design ...
    ... By Tamara Andrejevic Conveyor No. U-I-1 Design Date 20 March 2024 s. ; ~ ” Low BD = 960kg/m3 High BD = 960kg/m3 Conveyed Material Belt Speed & Capacity Material Description Ugalj Drmno Belt Speed 5.2 m/s Low Bulk Density 960 kg/m3 Belt Design Capacity Input 3570 tonnes/hr High Bulk Density ...
    ... Carcass Mass 19.3. kg/m Edge Distance 0.4942 m2 Belt Mass Wb (per linear m) 82 kg/m Flooded Belt Capacity 8881 tonnes/hr Material Mass Wm 190.7 kg/m Flooded Belt Material Mass 474.4 kg/m Total Mass (Wb + Wm) 272.7 kg/m Total Belt Mass (Wb x L) 266443 kg Designers Comments {\rtfi\ansi\deff ...

  • Crystal structure of K3EuSi2O7

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu
    ... Please cite this article as S. Z. Kovač, P. Z. Dabić, A. S. Kremenović, J. Serb. Chem. Soc. (2021) https://doi.org/10.2298/JSC210218026K This “raw” version of the manuscript is being pvided to the authors and readers for their technical service. It must be stressed that the manuscript still has ...
    ... Diffraction data were processed with the CrysAlisPro.17 The synthesized pro- ducts were tested using X-ray powder diffraction (XRPD). A small amount of material was finely ground and tested on a Philips PW1710 X-ray powder diffractometer at room temperature using Bragg-Brentano geometry and Cu Kα radiation ...
    ... The temperature was lowered to 973 K at a rate of 2 K/h and then the furnace was switched off. After cooling to room temperature, the resulting material was manually removed from the crucible, washed with distilled water and dried in air. Bow-tie aggregate colorless crystals up to 300 μm size embedded ...