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Упит dcterms_subject_txt:rock breakage by explosives

1093 items

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... existing district heating system, and (d) the design of a new district heating system supplied by a heat pump. By implementing one of the options, heat demands of customers in urban areas can be served by exploiting sur- plus heat that would have otherwise been dissipated. This will result in energy ...
    ... Jagodina, Šabac). The other group of DH systems is charac- terized by high values of primary energy factor and carbon dioxide coefficient, as well as by low import dependency (Kragujevac, Kruševac, Bor). These systems are mainly fueled by a domestic energy source: coal. Values of the Shannon–Wiener index ...
    ... import dependency (United Nations 2019). Transition to more sustainable systems can be achieved by acting on the demand and supply sides. In the previous period, much attention was paid to the demand side, by retrofitting the building stock, but lately, the supply side has received more attention in ...

  • An aproach to Implementation of blended learning in a university setting

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović (2011)
    ... graded by the teacher. The grade can be accompanied by a comment, which draws the student’s attention to errors in his/her work, or gives some kind of suggestion or advice, etc. Figure 6 depicts part of a grading page, where each grade is followed by an appropriate comment. By grading ...
    ... the concept of e-learning, which can most broadly be perceived as comprising all forms of learning and teaching supported by electronic devices, the opportunities offered by Internet and Web are now prevailing. Hence the term Web-based learning or Web- based education is now also frequently encountered ...
    ... and the archive status. For each course the administrators can define the number of most recent copies to be kept by Moodle, and set copies of the backup report to be sent by e-mail. More details on Moodle and its application in practice can be found in [4]. Figure 3. Number of ...

  • OntoLex Publication Made Easy: A Dataset of Verbal Aspectual Pairs for Bosnian, Croatian and Serbian

    Ranka Stanković, Maxim Ionov, Medina Bajtarević, Lorena Ninčević (2024)
    Ovaj rad predstavlja novi jezički resurs za pretraživanje i istraživanje verbalnih aspektnih parova u BCS (bosanskom, hrvatskom i srpskom), kreiran korišćenjem principa Lingvističkih Povezanih Otvorenih Podataka (LLOD). Pošto ne postoji resurs koji bi pomogao učenicima bosanskog, hrvatskog i srpskog kao stranih jezika da prepoznaju aspekt glagola ili njegove parove, kreirali smo novi resurs koji će korisnicima pružiti informacije o aspektu, kao i link ka aspektnim parovima glagola. Ovaj resurs takođe sadrži spoljne linkove ka monolingvalnim rečnicima, Wordnetu i BabelNetu. ...
    aspekt glagola, lingvistički otvoreni podaci, BCS

  • Evidence for Ladinian (Middle Triassic) platform progradation in the Gyulakeszi area, Tapolca Basin, Western Hungary: Microfacies Analysis and Biostratigraphy

    Zsolt Robert Nagy, Nevenka Đerić, Sándor Kovács, Anna Oravecz-Scheffer, Felicitász Velledits, Olga Piros, Gabor Csillag (2014)
    anizik, ladin, karbonati, litostratigrafija, biostratigrafija, konodonti, radiolarije, dijageneza
    ... nodular limestone were taken from not in-situ rock exposures. recrystallized so that the original texture cannot be identified. Many of the clasts are broken and angular/sub-angular. Some of the large bra- chiopod and bivalve shells remained unaffected by diagenesis; the facies is otherwise unfo ...
    ... road (continuation of Jokai Street) where no in-situ rock was exposed. On the west side of the dirt road white limestone (“upper unit”) samples were collected from boulders and small in-situ rock exposures near the water tower, where the rock is thick-bedded or massive with 20 to 40 degree dip ...
    ... unit (samples Gy51, Gy52, Gy54, Gy56, and Gy58 on Fig. 3) was dominated by massive limestone without visible strati- fication. The limestone is characterized by peloidal micrites organized in thrombolytic clots and cemented by marine cement (Figs 5/1-2). The main components include encrustation ...

  • 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 (2020)
    Paleontology,Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics,Oceanography

  • Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel (2016)
    General Earth and Planetary Sciences
    ... 1977), which are interpreted as partial resetting of an original Permo-Triassic cooling age by the Jurassic low-grade event. Younger K-Ar cooling dates were previously reported for the whole-rock sam- ples from the western part of the Lower Complex (137— 122 Ma; Milovanović 1990) and mica ...
    ... although similar to the protoliths of the Lower Complex, is generally dominated by ocean-floor sediments (Pantić et al. 1967; Petrović 1969), intruded by late Cadomian igneous rocks (Antić et al. 2015b), covered by a Lower Ordovician to lower Carboniferous sedimentary sequence (post-Cambrian ...
    ... to steep with appar- ently no preferred orientation (Fig. 4b). The orientation of by axes is determined by calculating the intersection of foliation S, folded into large open folds in outcrop scale, or by scarce intersection lineation between S, and crenula- tion cleavage Ss. These axes are ...

  • Low-temperature phase transition and magnetic properties of K3YbSi2O7

    Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica
    ... at 298 K and 100 K, respectively, are related by the following 4 by 4 transformation matrix: �1 1 0 0 �1 �1 0 0 0 0 1 1 2 0 0 0 1 0 B B @ 1 C C A Amore detailed understanding of the phase transformation in K3YbSi2O7 can be achieved by symmetry-mode analysis. In the course of this procedure ...
    ... of crystal 1 determined at 298 K and 100 K, respectively, are related by the following 4 by 4 transformation matrix: | — | — oro;9} Pur OO A more detailed understanding of the phase transformation in K;YbSi,O; can be achieved by symmetry-mode analysis. In the course of this procedure implemented in ...
    ... types, which are parallel to the (001) plane. In the octahedral layer, YbO6 octahedra are isolated and linked by K1O6+3 polyhedra. The second, slightly thicker sorosilicate layer is formed by a combination of Si2O7 dimers and K2O6+3 polyhedra. The boundary between the layers is a pseudo-kagome oxide ...

  • Investigation of nanostructured Ca0.9Er0.1MnO3 obtained by sucrose nitrate procedure

    Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)
    ... 1MnO3 obtained by sucrose nitrate procedure Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Investigation of nanostructured Ca0.9Er0.1MnO3 obtained by sucrose nitrate ...
    ... 18-20, 2023 Serbian Academy of Sciences and Arts, Knez Mihailova 35, Belgrade, Serbia P23 Investigation of nanostructured Cao„SEr,ı MnOx obtained by sucrose nitrate procedure Tijana B. Vlaškovićl, BojanaLabanl, MajaMilošeVićZ, MariaČebeIa3, Vladimir Dodevski3, Milena Rosić? !Faculty of Sciences ...
    ... Serbia, P.O. Box 522, 11001 Belgrade, Serbia,University of Belgrade Nano-crystalline CaooEro,, MnOa oxide with a perovskite structure was synthesized by the sucrose nitrate procedure (SNP), with the help of sucrose, which plays the role of fuel and complexant. Other chemicals used are calcium nitrate ...

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... the structureless sandstone bed C20. Clay chips are highlighted by white lines. (c) A polished rock slab showing the structures of siltstone and sandstone layers. (d) A thin-section viewed in non-polarized light showing the plant detritus above the parallel laminated siltstones. G eo lo g ia C ...
    ... – medium-grained sandstone, c – coarse-grained sand- stone). The sedimentary sequences or beds are designated by the letter of the unit and a number. The sedimentary structures are marked by gray boxes within corresponding columns (1 – normal grading, 2 – planar lamination, 3 – hum- mocky-type lamination ...
    ... lamination, 4 – convolution, 5 – structureless intervals). The fossils within beds or sequences are marked by letters - p (plants) and - i (ichnofossils). Interpreted units are marked by capital cursive letters A – D. All units correspond to compared facies families of the hyperpycnite tract (after ZAVALA ...

  • Validation of vulnerability assessment by means of the Time Dependent, Model: case study from the Slovenian karst catchment

    Vladimir Živanović, Nataša Ravbar, Igor Jemcov (2019)
    Groundwater vulnerability assessment methods are continuously being developed and existing methods are very often modified to provide better simulation of natural protection conditions and more objective results. Most frequently used methods are based on calculation of predefined parameters influencing water infiltration and underground flow, which can often lead to bias conclusions related to vulnerability evaluations. Some other methods, like the Time Dependent Model (TDM) are based on an approach, where parametrization is obtained at the final stage of the ...
    Ocena ranjivosti podzemnih voda, karstne podzemne vode, TDM metoda, delineacija sanitarnih zona, Slovenački karst

  • The Late Devonian contraction along the Precaspian Basin north margin: Transpressional range building in the intracratonic domain

    Novak Novčić, Marinko Toljić (2023)
    The evolution of intraplate sedimentary basins located in the vicinity of an active convergent plate boundary is often controlled by the collisional dynamics of the adjacent orogen. The transfer of compression from the orogen to the platform's interior results in the formation of complex structural geometry and kinematics that often reactivate older crustal faults, focus far-field stresses and control the evolution of associated sedimentary basins. One place where this localisation can be optimally understood is the Precaspian Basin, situated ...
    Intrakratonske deformacije, transpresija, kosa kompresija, krustalni rasedi, intrakratonski transfer stresa, kontrakcioni blokovi

  • Regional Slope Stability Analysis in Landslide Hazard Assessment Context, North Macedonia Example

    Miloš Marjanović, Biljana Abolmasov, Igor Peshevski, James Reeves, Irena Georgievska (2020)

  • Permanent GNSS monitoring of landslide Umka

    Mileva Samardžić Petrović, Jovan Popović, Uroš Đurić, Biljana Abolmasov, Marko Pejić, Miloš Marjanović (2020)
    Клизиште Умка је једно од највећих насељених активних клизишта у Србији. Активност клизишта Умка се прати већ више од 85 година, различитим геотехничким и геодетским техникама. Од 2010. године, активност kлизишта се континуирано прати у реалном времену аутоматизованим перманентним системом за праћење базираним на Глобалним навигационим сателитским системима (ГНСС). Поред тога, од 2018. године активност клизишта се додатно прати кинематичким ГНСС одређивањем положаја скупа карактеристичних тачака као и применом UAV фотограметрије. Главни циљ овог рада је приказ резултата опажања три ...
    клизиште, перманентно праћење, ГНСС
    ... years, by various geotechnical and geodetic techniques. Since 2010, landslide activity has been continuously monitored by automated permanent Global Navigation Satellite System (GNSS) based monitoring system in real time. Furthermore, since 2018 landslide activity has been monitored by GNSS kinematic ...
    ... Apart from the geodetic survey method, the dynamic of landslide Umka is investigated by various geotechnical techniques [10]. However, the primary focus of this paper is the presentation of the results derived by GNSS kinematic positioning of characteristic points of Umka landslide during three ...
    ... monitored by different geotechnical and geodetic techniques for decades. 93 PROCEEDINGS OF INTERNATIONAL CONFERENCE ON CONTEMPORARY THEORY AND PRACTICE IN CONSTRUCTION XIV PERMANENT GNSS MONITORING OF LANDSLIDE UMKA According to geotechnical investigations at 2005 by the Highway ...

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... determined by the standard and modified Proctor com- paction tests in accordance with the SRPS EN 13286-2:2012 standard. The tests were performed by com- pacting the prepared samples in a cylindrical mold with a diameter of 150.0 mm. The following material characteristics were determined by testing ...
    ... laboratory by conducting the CBR test using cylinders. Other than static CBR, this is the only method that can be used in the laboratory to determine the re- quired CBR, values related to the compaction characteristics. Under field conditions, it is possible to estimate the soil compaction by comparing ...
    ... moisture. The relationship between the dynamic modulus of deformation E„,and the CBR., index is described by a linear function. The correlation dependence is shown in Fig. 4 and is defined by Eq. (9). The correlation is based on the CBR. values measured in the range of 15%-80%. The high correlation ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... 101–110, ISBN 978-86-83497-24-9. © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). http://dx.doi.org/10.1371/journal ...
    ... importance and can be made easier by carrying out an analysis of the existent operational-exploitative parameters. In this paper, the method of grading the operational-exploitative parameters of dozer is defined. The choice of the optimal type of dozer was conducted by using the analytical hierarchy process ...
    ... importance and can be made easier by carrying out an analysis of the existent operational-exploitative parameters. In this paper, the method of grading the operational-exploitative parameters of dozer is defined. The choice of the optimal type of dozer was conducted by using the analytical hierarchy process ...

  • 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
    ... (accessed on 12 July 2020). (o 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). ...
    ... pottery is not glazed) was accomplished by using,sheep fat to plug, the pores. Indeed, both the porosity and the fiber reinforcement improve the mechanical toughness of the artefact. According to ethnographic records, the production was conducted mainly by women potters in villages, and the firing ...
    ... present here the first study of four shards provided by the Corsican Archaeological Office (DRAC). 2. Materials and Methods 2.1. Pottery Shards The four shards have been selected for the variability of their color from a series of samples collected by Corsican scholars in the northeast of Corsica ...

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... containing send or other proppants suspended with var- ious agents. Hydraulic fracturing creates cracks in the deep rock formations through which gases flow. The coal layer is usually ignited by inserting a hot coke through the borehole and blowing the low pressure air. Instead of firing coal layer with ...
    ... drilled boreholes can be accomplished in following ways: — by connecting them to the compressed air line (p = 50 bar), or even nitrogen, — by water pressure with a pump set, and — by establishing a link with hydraulic fracturing, by means of high-pressure injection of the fluid (such as water ...
    ... significantly mitigated by carefully se- lecting the location and with process management. These potential negative impacts on the en- vironment can be reflected in the quality of groundwater resources, while the surface subsidence ofthe terrain may be caused by the cavities generated by the onsite coal ...

  • The effect of finite driving rate on avalanche distributions

    Sonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević (2021)
    Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear Physics

  • Old or New, We Repair, Adjust and Alter (Texts)

    Cvetana Krstev, Ranka Stanković (2020)
    U ovom radu predstavljamo kako se e-rečnici i kaskade transduktora konačnih stanja implementirani u alatu Unitex mogu koristiti za rešavanje tri problema transformacije teksta: ispravljanje tekstova nakon OCR-a, vraćanje dijakritičkih znakova i prebacivanje između različitih jezičkih varijanti.
    ispravka teksta, OCR greške, restauracija dijakritika , jezičke varijante, elektronski rečnik, transduktori konačnih stanja
    ... Three phases of a text correction: 1) Marking of incorrect/unrecognized words by e-dictionaries; (2) Automatic correction by offering possible candidates; (3) Elimination of incorrect candidates and correction of remaining errors by a reader. 3 Diacritic restoration The problem of diacritic restoration ...
    ... characters can be omitted while still allowing text reconstruction by humans. Following this line of research the first practical solutions to correcting spelling errors emerged. The idea of a program that corrects spelling errors is reported by Blaire (1960). It consists of weighting the letters to create ...
    ... errors produced by humans (typographic errors, author’s ignorance) or machines during transmission and storage (Peterson, 1980). Peterson, as many other authors, classifies typographic errors into four groups: insertions, deletions, replacements and reversals. However, texts pro- duced by humans can also ...

  • A bilingual digital library for academic and entrepreneurial knowledge management

    Ranka Stanković, Cvetana Krstev, Biljana Lazić, Dalibor Vorkapić (2015)
    A generic knowledge management process of organization, storage and retrieval of knowledge can suitably be fitted in a digital library. In the digital and knowledge age digital libraries can be used in knowledge management to handle intellectual assets and support knowledge creation. A multilingual digital library either stores content in more than one language or provides multilingual query access to monolingual content. In Serbia 18 of 308 scientific journals regularly published are bi-lingual, with papers simultaneously being in English ...
    Knowledge management, Digital library, Multilingualism, Language Resources, Terminology
    ... Besides searching by metadata, Bibliša offers a full-text search by keywords of the user’s choice. A user’s original query, which can be issued in each of the two languages, can be expanded in several different ways: by translating into other languages, morphologically by including all inflected ...
    ... metadata and full-text search by entering queries in one of two languages. For a full-text search the user formulates the initial query as one or more keywords (simple or multiword). By default, the system will search all collections, but the user can restrict it by selecting a particular collection ...
    ... collection by metadata in order to analyse the whole content of a collection. The search of the Serbian or English part of the collection using an author’s name, words in the title, year of publishing and keywords (either individually or by combining some or all of them) is available by clicking ...