Претрага

Упит dcterms_subject_txt:ratio of modified secondary and primary compression index

2950 items

  • 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
    ... agent instead of air, the optimal ratio should be about 7-8 kg of steam per m? of O». If only oxygen is used, the calorific value ofthe gas from such UCG process would be 2-2.5 times higher than that of air gasification [2]. Analyzing UCG process as a way of obtaining a suitable and useful energy ...
    ... structures of the coal bed, as well as coal roof and coal fioor. Coal gasification chemistry includes Gasification cavity shape seven primary reactions occurring within the with CRIP layer. The primary reaction that happens is the displacement reaction of the generated water vapor (H.O) and gas, ...
    ... coal layers using injection of oxidants and steam. The product gas is transferred to surface through wells drilled from the surface, fig. 1. World experiences in UCG indicate that the primary form of coal energy should be treated much more rationally. The effects of the UCG application have resulted ...

  • Analiza obrazovnog sistema i kadrovskog potencijala Republike Srbije u oblasti rudarstva i geologije

    Dragan Ignjatović, Stevan Đenadić, Predrag Jovančić, Filip Miletić, Jovana Mitrović (2024)
    Adekvatno postavljen i kontinualno unapređivan sistem obrazovanja predstavlja jasan preduslov za razvoj pojedinca, društva i države u celini. Sistem obrazovanja u Republici Srbiji davno je postavljen, a reforme nisu do kraja sprovedene. Posebno je to izraženo u visokom obrazovanju gde reforma po bolonjskom sistemu nije do kraja sprovedena ili je negativno zloupotrebljena. Trenutno je sistem obrazovanja je pod velikim pritiskom usled oštrih zahteva tržišta rada. U ovom radu je izvršena analiza obrazovnog sistema u oblasti rudarstva i geologije u ...
    obrazovanje, rudarstvo, geologija
    ... in addition to knowledge in mining and geology, often need to possess skills in organization and management as Wwell as decision-making abilities. The paper provides an overview of the current situation in secondary and higher education in the fields of mining and geology. Furthermore, it outlines ...
    ... education system is under significant pressure due to the sharp demands of the labor market. This paper analyzes the education system in the field of mining and geology in the Republic of Serbia. Given that mining and mineral resources are of vital importance to society, active participation from experts in ...
    ... OBRAZOVNOG SISTEMA I KADROVSKOG POTENCIJALA REPUBLIKE SRBIJE U OBLASTI RUDARSTVA I GEOLOGIJE ANALYSIS OF THE EDUCATION SYSTEM AND PERSONNEL POTENTIAL IN THE FIELD OF MINING AND GEOLOGY IN THE REPUBLIC OF SERBIA Ignjatović D.!, Đenadić S-?, Jovančić P.*, Miletić F.“, Mitrović J.5 Apstrakt Adekvatno ...

  • Production information system of the Pljevlja coal mine

    Božo Kolonja, Ranka Stanković, Filip Vuković (2018)

  • Development of a petrographic classification system for organic particles affected by self-heating in coal waste. (An ICCP Classification System, Self-heating Working Group – Commission III)

    M. Misz-Kennan, J. Kus, D. Flores, C. Avila, Z. Büçkün, N. Choudhury, K. Christanis, J.P. Joubert, S. Kalaitzidis, A.I. Karayigit, M. Malecha, M. Marques, P. Martizzi, J.M.K. O'Keefe, W. Pickel, G. Predeanu, S. Pusz, J. Ribeiro, S. Rodrigues, A.K. Singh, I. Suárez-Ruiz, I. Sýkorová, N.J. Wagner, D. Životić (2020)
    Self-heating of coal waste is a major problem in the leading coal-producing and consuming countries, independent of the recent or past coal exploitation history. The phenomenon of self-heating is dependent on many factors such as the properties of organic matter (maceral composition and rank), moisture and pyrite content, climate effects, and storage conditions (shape of the dump or compaction of the coal waste). Once deposited, coal waste undergoes oxidation, which can lead to self- heating with the overall temperatures ...
    Stratigraphy,Economic Geology,Geology,Fuel Technology

  • Digitalizacija u rudarstvu: Kreiranje sistema za efikasno poslovno izveštavanje

    Stevan Đenadić, Aleksandar Mirković, Veljko Rupar (2024)
    Proces donošenja odluka u oblasti rudarstva i geologije uslovljen je blagovremenim posedovanjem kvalitetnih podataka i informacija. Kompleksnost rudarskih procesa nalaže prikupljanje podataka na dnevnom odnosno na smenskom nivou. Podaci kao takvi bez analitičkog pristupa nisu dovoljni. Kako bi pristup podacima bio brz i efikasan neophodno je posedovanje adekvatnog digitalnog rešenja uz adekvatne centralizovane baze podataka. U ovom radu je dat pregled trenutne pozicije rudarstva sa aspekta digitalne transformacije kao i predlog jednostavnog prototipa u obliku digitalnog sistema za poslovno ...
    rudarstvo, digitalna transformacija, baze podataka
    ... in the field of mining and geology is conditioned by timely access to quality data and information. The complexity of mining processes requires data collection on a daily or shift basis. Data, as such, without an analytical approach, is insufficient. For access to data to be quick and efficient, it ...
    ... centralized databases. This paper provides an overview of the current position of mining from the perspective of digital transformation, as well as a proposal for a simple prototype in the form of a digital system for business reporting and analytics. Keywords: mining, digital transformation, databases ...
    ... запослених доступним у слободном приступу. - Претрага репозиторијума доступна је на www.dr.rgf.bg.ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available ...

  • GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities

    Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević (2021)
    GNSS, Time series, Seismic deformations, Earthquake, Infrastructure utilities

  • Increasing the Local Road Network Resilience from Natural Hazards in Municipalities in Serbia

    Biljana Abolmasov, Miloš Marjanović, Ranka Stanković, Uroš Đurić, Nikola Vulović (2024)
    lokalni putevi, prirodni hazardi, otpornost na klimatske promene, MaPLoRds

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... elementary and secondary school. It is interest to nota that the course “Preparation for entry exam” was suggested to more than 300 students, but only 155 students have enrolled. There can be many reasons for that situation, such as unsuccessful promotion of the course and its content, lack of students’ ...
    ... Belgrade, Serbia ADVANTAGES AND CHALLENGES IN PRESENTING MATHEMATICAL CONTENT USING EDX PLATFORM MARIJA RADOJIČIĆ University of Belgrade, Faculty of Mining and Geology, marija.radojicic@rgf.bg.ac.rs IVAN OBRADOVIĆ University of Belgrade, Faculty of Mining and Geology, ivan.obradovic@rgf.bg ...
    ... choosing fonts and size of text, adding pictures and links and setting up indentations. Besides the basic editor, the creator of materials can use html view of text. In that case the creator has more opportunities in editing text but it demands creator’s basic knowledge of html. Task component ...

  • Hydrogeochemistry of Uranium in the Groundwaters of Serbia

    Marina Ćuk, Maja Todorović, Petar Papić, Jovan Kovačević, Zoran Nikić (2015)

  • Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery

    Maja Milošević, Biljana Đorđević, Mihovil Logar (2020)
    калцит, сирова глина, традиционална керамика, Злакуса
    ... application) and ClBd (the final clay body after mixing the raw clay with the CC in the appropriate ratio). The CIMx sam- ple consists mainly of AlL,Os (~16 wt.%) and SiO> (+57 wt.%) together with minor amounts of CaO, K,O and TiO», which indi- cate a large amount of clay minerals with quartz and feldspars ...
    ... in the high quality of the pots, which contributed to the survival of this form of pottery despite periods in which demand for it had almost completely ceased. It is this ability to ind the best raw clay and the best type of temper (calcite) and mix them in the optimum ratio that has kept Zlakusa ...
    ... hammer mill, and for the most part, the same par- ticle size is used for all types of vessels. The fine grinding ham- mer mills are not standardized and are products of the potters themselves. After that, the calcite is sieved and added to the clay body in a clay:calcite ratio of 1:1 or 0.4:0.6 ...

  • NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands

    Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić (2012)
    Reakcije supstitucije monofunkcionalnog [Ru(terpi)(bipi)(H2O)]2+ kompleksa, gde je terpi = 2,2′:6′,2″-terpiridin i bipi = 2,2′-bipiridin, sa biološki relevantnim sumporo donorskim ligandima, kao što su tiourea, l-metionin, l-cistein i glutation, proučavane su u vodenim rastvorima tehnikom 1H i 13C NMR spektroskopije. Sve reakcije su proučavajne na pH 7,4, u prisustvu fosfatnog pufera, da bi se oponašalo fiziološko okruženje tokom procesa supstitucije. Reakcije se izvode na 295 K pod uslovima reakcija drugog reda. Uočeni rezultati pokazuju da brzina supstitucije snažno zavisi ...
    Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

  • The Nooj System as Module within an Integrated Language Processing Environment

    Ranka Stanković, Duško Vitas, Cvetana Krstev (2008)
    NooJ, electronic dictionary, lexical resources
    ... same or other language. For example, if a query consists of Serbian word ‘kompjuter’, it can be expanded by Serbian wordnet to ‘računar, kompjuter’, and then transformed by ILI (interlingual index) to query consisting of a set of English keywords: ‘computer, computing machine, computing device ...
    ... a single query is opened. NooJ supports morphological query expansion and expansion of queries by graphs and regular expressions. The integration of the morphological power of NooJ with the semantic and multilingual power of wordnets may best be illustrated by concordance production using various ...
    ... morphological dictionaries of lemmas for simple and compound words but also of bilingual and multilingual dictionaries - development and refinement of wordnets, with simultaneous usage of wordnets for different languages - conversions from different formats such as one character encoding set to ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... Response Energy use Level of annual coal exploitation Convert primary coal energy into secondary energy Share of lignite use compared to other types of coal Rational consumption of coal reserves Energy efficiency incentive Use of alternative energy sources and better types of coal Measures to be taken ...
    ... in terms of short-term exposure to a higher level of concentration of pollutants, based on the determination of the air pollution index, in order to determine dependence and point to the expected severity of consequences was performed [36]. In the facility “Conveyance and dispatch of coal” in the thermal ...
    ... ash and water ratio in the thick pulp 5 3 1 + 0 + 1 + 0 + 0 + 1 60 31 Increased concentration of heavy metals in overflowing, drainage, and leachate water 5 3 1 + 0 + 1 + 1 + 0 + 1 60 32 Increased acidity of overflowing, drainage, and leachate water 5 3 1 + 0 + 1 + 1 + 0 + 1 60 33 Dam failure and flowing ...

  • Long-term planning methodology for improving wood biomass utilization

    Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković (2019)
    The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...
    Long-term planning methodology, Forest biomass, MINLP, Backcasting

  • A comparison between ARIMA, LSTM, ARIMA-LSTM and SSA for cross-border rail freight traffic forecasting: the case of Alpine-Western Balkan Rail Freight Corridor

    Miloš Milenković, Miloš Gligorić, Nebojša Bojović, Zoran Gligorić (2023)
    železnica, prekogranični teretni saobraćaj, ARIMA, LSTM, SSA

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... 17, 2022 PLOS ONE Surface functional groups and degree of carbonization of selected chars Table 9. Ratio of the heights of D and G peak (ID/IG), crystallite size calculated from ID/IG, and the wavenum- bers v „. of peak maxima of the Raman spectra of the chars. Char Ip/IG L,/nm V x(D) /cm" Voeax(G) ...
    ... resulting O/C ratio is much closer to the value found by element analysis (0.06). The results for the relative fraction of different types of CO functional groups obtained by C1s and O1s are in fair agree- ment. The ratio of C-O and C = O from O15s, denoted as Ro:s(CO) and the ratio of C-O groups ...
    ... was above the detection limit for AC1 and PW700g and will be discussed later. The content of C, H and O is best discussed by a van Krevelen diagram (Fig 2) [52,75]. All chars except PW700g show a higher H/C and a lower O/C ratio than expected for the loss of water from formal car- bohydrate (CH»O) ...

  • A Mathematical Learning Environment Based on Serbian Language Resources

    Radojičić Marija, Obradović Ivan, Stanković Ranka, Utvić Miloć, Kaplar Sebastijan (2018)
    In recent years, in line with ever growing usage of Information technology, the learning environments are changing. The amount of available learning materials in various forms has increased. These new environments demand comprehensive learning systems, which enable management of the learning corpus with special attention paid to relevant lexical resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling ...
    mathematical content, text processing, mathematical formulae
    ... encoding, indexing, compression and decoding large text corpora (up to 2 billion words) with multiple layers of word-level annotation. CQP is a powerful and efficient concordance system which can process query patterns specified both at the character level (specifying a form of an individual word ...
    ... Novi Sad/Faculty of Technical Sciences, Novi Sad, Serbia 2 University of Belgrade/Faculty of Mining and Geology, Belgrade, Serbia 3 University of Belgrade/Faculty of Philology, Belgrade, Serbia * marija.radojicic@uns.ac.rs Abstract: In recent years, in line with ever growing usage of Information ...
    ... environment built around a corpus of mathematical content and provides mechanisms for processing and search of this content. It relies on existing lexical resources, morphological e-dictionaries and WordNet of Serbian, which have been developed within the University of Belgrade Human Language Technology ...

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • A tool for identifying the criticality in the disordered systems with metastable dynamics

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević (2021)
    Физика кондензоване материје

  • XRD dertermination od hydrothermal phases related to epithermal mineralization in the Čukaru Peki deposit

    Dragana Bosić, Vladica Cvetković, Miodrag Banješević, Kristina Šarić (2024)
    Čukaru Peki, epithermal mineralization, hydrothermal alterations