Претрага
1705 items
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A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia
When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...... importance 1.1–2.5% 2/3, 1, 3/2 2/3, 1, 3/2 Moderate importance 2.6–6.5% 1, 3/2, 2 1/2, 2/3, 1 Strong importance 6..6%–15% 3/2, 2, 5/2 2/5, 1/2, 2/3 Very strong importance 15.1%–30% 2, 5/2, 3 1/3, 2/5, 1/2 Absolute importance More than 30% 5/2, 3, 7/2 2/7, 1/3, 2/5 commonly used to determine group preferences ...
... supply refers to the capability of each RES to ensure reliable electricity supply (such as generation and transmission capacity) and to maintain normal customer supply (Groissböck and Gus- mão, 2020). 3. Employment Creation (SC3) - direct employment gener- ated by activity related to renewable energy ...
... necessary to find (−1) power of summation ∑n i=1 ∑m j=1 M j gi: ⎡ ⎣ n ∑ i=1 m ∑ j=1 M j gi ⎤ ⎦ −1 = ( 1 Σn j=1ui , 1 Σn j=1mi , 1 Σn j=1li ) (5) Table 4 Global electricity costs in 2018 (IRE, 2019). RES USD/kWh Hydro 0.047 Solar 0.085 Wind 0.056 Biomass 0.062 Fig. 5. Intersection ...Boban Pavlović, Dejan Ivezić, Marija Živković. "A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia" in Energy Reports, Elsevier BV (2021). https://doi.org/10.1016/j.egyr.2021.02.072
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Indexing of textual databases based on lexical resources: A case study for Serbian
In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...... Di, where i = 1, . . . N and N is the size of text collection; 3. Recognizing NEs and assigning the chosen types to documents; 4. Selecting ungrammatical words Tij and calculating their frequencies nij for each Di, i = 1, . . . N ; 5. Calculating the relative frequency tfij for each term Tij in a text ...
... http://dx.doi.org/10.1007/3-540-51465-1 3 3. Hiemstra, D.: Using language models for information retrieval. Taaluitgeverij Nes- lia Paniculata (2001) 4. Jackson, P., Moulinier, I.: Natural language processing for online applications: Text retrieval, extraction and categorization, vol. 5. John Benjamins Publishing ...
... Improvement 11.49% The evaluation revealed that some NEs referring to the same entity occur in various forms which can deteriorate search results. For instance, the name of one person that documents refer to frequently occurs in 12 different forms:5 Dr Petar Petrović, Mr Petar Petrović, Prof. dr Petar Petrović ...Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović. "Indexing of textual databases based on lexical resources: A case study for Serbian" in Semantic Keyword-based Search on Structured Data Sources : First COST Action IC1302 International KEYSTONE Conference, IKC 2015, Coimbra, Portugal, September 8-9, 2015. Revised Selected Papers, Springer (2015). https://doi.org/10.1007/978-3-319-27932-9_15
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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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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. "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" in Transportation Planning and Technology, Informa UK Limited (2023). https://doi.org/10.1080/03081060.2023.2245389
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Production information system of the Pljevlja coal mine
Božo Kolonja, Ranka Stanković, Filip Vuković . "Production information system of the Pljevlja coal mine" in Mine Planning and Equipment Selection 2000, Routledge (2018). https://doi.org/10.1201/9780203747124-154
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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... značajan uticaj rudarskih radova na promenu napona duž rasedne površi, u zavisnosti od toga da li rudarski radovi napreduju sa podinskog krila (slika 3-5a) ili sa povlatnog krila raseda (slika 3-5b). Slika 3-5. Raspored sila duž rasedne površi pri napredovanju rudarskih radova: (a) sa podinskog ...
... sever jug i istok- zapad može odbaciti, pošto su samo za 3, odnosno 5 slučajeva (respektivno), surogat nizovi i originalna serija u korelaciji ( 0≈ ). Za vertikalni pravac oscilovanja tla, nulta hipoteza se takođe može odbaciti, s obzirom na to da je prag značajnosti za a u svim slučajevima jednak ...
... (krupne strelice na slici 3-12). Stoga, dva fokalna mehanizma (broj 1 i 4 na slici 3-12) ukazuju na to da su potresi u Belčatovu i Šombierki (1981) direktno pod uticajem tektonskog naponskog polja. S druge strane, normalna rasedanja za potrese broj 2 i 3 na slici 3-12, ukazuju na dominantnu ulogu ...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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Geotehnički uslovi izgradnje tunela „Debelo brdo“ na autoputu E-80 Niš - Pločnik
Tunel „Debelo brdo“ nazvan je po najizraženijem relјefnom obliku na ovoj drugoj deonici autoputa E-80 Niš – Pločnik. Osnovnu geološku građu na lokaciji tunela čini Mio-Plioceni kompleks heterogenog litološkog sastava. Izgradnja tunela je predviđena delom u otvorenom iskopu dužine 240 m, a delom sa podzemnim iskopom dužine 190 m. U zoni tunela, padina je okarakterisana kao uslovno stabilna, pa bi neadekvatna zasecanja mogla da izazovu klizanja terena. Iz tih razloga, u okviru rada posebno su prikazani geotehnički uslovi izgradnje ...... tunelskog iskopa pri faktoru stabilnosti Ns > 1, cr. To je neophodno ugraditi oblogu (primarnu podgradu) dovoljne nosivosti i krutosti skopa, ali on inu od 3-6 m. Tabela 3. Fazni prikaz simulacije iskopa i podgra Korak 1 D Korak 2 F Korak 3 Inicijalno stanje Korak 4 Relaksacija stenske ...
... izgradnju autoputa E-80 (SEETO Ruta 7): od administrativnog prelaza Me izgradnje objekata p. [3] ; ; ; ; uslovi izgradnje autoputa E- - -82. [4] ; ; izgradnje autoputa E- - -92. [5] ; ; ; ; Merdare, Zbornik radova - CD (Book of papers - Srpski kongres o putevima, Beograd, str. ...
... terena. Iz tih razloga, u okviru rada posebno su prikazani izgradnje tunela u otvorenom iskopu ( je projektno : Tunel Debelo brdo G parametri, Privremene kosine, ipovi, Podgrada. GEOTECHNICAL CONDITIONS FOR THE CONSTRUCTION OF ON THE HIGHWAY E- - 1, 2 Ikodinovi 3, 4 1 University ...Dragoslav Rakić, Radojica Lapčević, Irena Basarić Ikodinović, Dragan Lukić. "Geotehnički uslovi izgradnje tunela „Debelo brdo“ na autoputu E-80 Niš - Pločnik" in Četvrti Srpski kongres o putevima, 2-3. jun 2022., Beograd : Srpsko društvo za puteve Via Vita (2022)
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Phase relations and physical indicators of municipal waste from old landfills in Serbia
Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science... due to components that are tend to absorb water. In this case, average unit weight of components is equal to: 1 — AY, = 1+—· ž W..__—— 7 “/d[ o J s Ti (5) where: Ayi - increase of unit weight of component i In the literature we can find values that range in wide interval (y =3 – 17 ...
... correspond medium to well compacted waste (Figure 6). unit weighty (kN/n») unit weight y (KN/m*) 15 20 5 0+ E 10| x _ = 1/b = Ymax ~ Ti E e ii * 20| W kd k:1 ig a _ 8 30 \R Š : - |. Fi 7 Ti m b Š l% waste (kN/mž) (m/kN) (m3/kN) 40 FI poorly 5 2 0.1 .| medium 10 3 0.2 a |j welll 155 ...
... ranged from Gs = 1.977 to 2.39, and the highest values were obtained for waste samples with the highest soil material content (Figure 9). 2.391 1003 -24 < ı 2319 | 23 }|G FOR:10| H23 8 604 |2.2 404 |2.1 20 -|EI.926 L a || 12 a |D U -1 U-2 U-3 U-4 U-5 Fig. 9. Laboratory obtained ...Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić. "Phase relations and physical indicators of municipal waste from old landfills in Serbia" in Japanese Geotechnical Society Special Publication, The Japanese Geotechnical Society (2021). https://doi.org/10.3208/jgssp.v09.cpeg016
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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 ...Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić. "NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands" in Inorganica Chimica Acta, Elsevier BV (2012). https://doi.org/10.1016/j.ica.2012.09.016
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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... značajan uticaj rudarskih radova na promenu napona duž rasedne površi, u zavisnosti od toga da li rudarski radovi napreduju sa podinskog krila (slika 3-5a) ili sa povlatnog krila raseda (slika 3-5b). Slika 3-5. Raspored sila duž rasedne površi pri napredovanju rudarskih radova: (a) sa podinskog ...
... sever jug i istok- zapad može odbaciti, pošto su samo za 3, odnosno 5 slučajeva (respektivno), surogat nizovi i originalna serija u korelaciji ( 0≈ ). Za vertikalni pravac oscilovanja tla, nulta hipoteza se takođe može odbaciti, s obzirom na to da je prag značajnosti za a u svim slučajevima jednak ...
... (krupne strelice na slici 3-12). Stoga, dva fokalna mehanizma (broj 1 i 4 na slici 3-12) ukazuju na to da su potresi u Belčatovu i Šombierki (1981) direktno pod uticajem tektonskog naponskog polja. S druge strane, normalna rasedanja za potrese broj 2 i 3 na slici 3-12, ukazuju na dominantnu ulogu ...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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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 ...... 3 (3) Methanation _ CO + 3H, – CH, + H,O AH= —206.0 (4) Hydrogenating gasification C+2H,=CH, AH = -87.5 (5) Partial oxidation C + 1/20, - CO AH=-123.1 (6) Oxidation C+O,=CO, AH= -406.0 (7) Baudouard reaction C+CO,-2CO AH = +159.9 The concentrations of various gases relative to the total ...
... the assumed UCG exploitation field, fig. 5, the Pilot Plant (with thickness of the coal layer h = 6 m; p,= 1.3 t/mš) needs to be pro- cessed by gasification: 25 m 75m Figure 6. Exploitation Pilot Plant field for O, =75-50·:6·:1.3=29250tofcoal (3) UCG in Serbia Ifsuch a quantity ofcoal ...
... ly helps to establish that channel or reaction zone, fig. 3. The injection boreholes Above-ground gas processing plant Syngas HiorNH;? :: are drilled vertically through a semicircular rounded layer prior to entering the part of the coal layer and continues horizontally to the production ...David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić. "Valorization of non-balanced coal reserves in Serbia for underground coal gasification" in Thermal Science (2019). https://doi.org/10.2298/TSCI190725390P
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Претрага корпуса заснована на употреби екстерних лексичких ресурса путем веб-сервиса
У раду се разматра хибридни приступ претрази корпуса, илустрован на примеру алатки OCWB и NoSketch Engine, примењених на специјални корпус из области рударства (РудКор) и Корпус савременог српског језика (СрпКор). Разматрани приступ комбинује постојеће могућности алатки OCWB и NoSketch Engine, које своју претрагу заснивају на лингвистичкој анотацији корпуса, са новим могућностима претраге у виду консултовања екстерних језичких ресурса (морфолошки електронски речници српског језика и лексичка база података Српски ворднет). Хибридни приступ је реализован надоградњом вебсучеља која поменуте алатке користе ...... Табелу 5) укључујући и њихову флектив- ну парадигму, као и облике леме zatvor антонимија / antlemma [antlemma=»opovrgnuti»] антоними леме opovrgnuti (в. Та- белу 5), укључујући и њихову флективну парадигму хиперонимија / hyperlemma [hyperlemma=»ptica»] хипероними леме ptica (в. Табелу 5), укључујући ...
... а јединица (једночлана лексема) и поли- лексемска јединица (вишечлана лексема, в. Табелу 5, геолошки процес). Та- кође, одговор веб-сервиса може садржати и монолексемске и полилексемске јединице (в. Табелу 5, казнени завод као синоним за лексему затвор). Пошто процесори упита алатки OCWB и NoSketch ...
... цртама, описује лингвистичка анотација корпуса РудКор и СрпКор2013, као и могућности претраге тих корпуса по- моћу алатки OCWB и NoSketch Engine, утемељене на описаној лингвистич- кој анотацији. Одељак 3 даје преглед веб-сервиса за експанзију упита над корпусом који су засновани на лексичким и те ...Милош Утвић, Ранка Станковић, Александра Томашевић, Михаило Шкорић, Биљана Лазић. "Претрага корпуса заснована на употреби екстерних лексичких ресурса путем веб-сервиса" in Научни састанак слависта у Вукове дане - Vol. 48/3 Српски језик и његови ресурси, Међународни славистички центар, Филолошки факултет, Универзитет у Београду (2019). https://doi.org/10.18485/msc.2019.48.3.ch12
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An Approach to Efficient Processing of Multi-Word Units
Efficient processing of Multi-Word Units in the course of development of morphological MWU dictionaries is not easy to achieve, especially when languages with complex morphological structures are concerned, such as Serbian. Manual development of this type of dictionaries is a tedious and extremely slow process. To alleviate this problem we turned to our multipurpose software tool, dubbed LeXimir, in the production of lemmas for e-dictionaries of multi-word units. In addition to that, we developed a procedure aimed at making ...... components, 20 rules to MWUs with 4 components, 9 rules to MWUs with 5 components, and 5 rules to MWUs with 6 and more components. 4.3 Software implementation To manipulate the strategy in the form of a XML document our tool LeXimir relies on W3C standard languages Xquery and XSLT supported by .Net. ...
... variable does not need to instantiate to all values of some grammatical feature. Instead, it can inherit its value from a token itself. In the pattern <$3:Gen==$g> the variable $g inherits its value from the third token. For petokraka zvezda the variable $3 will instantiate to the value f since the ...
... second option was even offered. In general, it is safe to say that the results obtained in both evaluation cycles testify to the fact that our approach yielded a strategy and procedure which can greatly contribute to efficient processing of MWUs. 5 Existing and Further Applications The outlined procedure ...Cvetana Krstev, Ivan Obradović, Ranka Stanković, Duško Vitas. "An Approach to Efficient Processing of Multi-Word Units" in Computational Linguistics - Applications, Studies in Computational Intelligence 458 no. 458, Berlin Heidelberg : Springer-Verlag (2013): 109-129. https://doi.org/10.1007/978-3-642-34399-5_6
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Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study
Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2023)Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms ...... 50 100 150 200 Temperature (*C) 'European Journal of Pharmaceutical Sciences 189 (2023) 106557 T+M 1+1] In te ns it y (a .u .) 5 10 15 20 25 30 35 40 45 2 theta (?) Fig. 3. DSC thermograms (a) and XRPD diffractograms (b) of freeze-dried samples with trehalose as cryo-/lyoprotectant obtained ...
... lyophilization. According to the results of this study, primary drying should be performed below Tg to promote interactions between lyoprotectant and the nanocrystals. In all cases, a sucrose/ trehalose to mannitol ratio of 3:2 at a total concentration of 10% lead to the maintenance of particle ...
... 10% (S+M 2 + 1 10%, S+M 3 + 2 10%, and S+M 1 + 1 10%). The particle size remained almost the same and the PDI was less than 0.200, indicating uniform particle size. However, at a sucrose to mannitol ratio of 2 to 1 (S+M 2 + 1 10%), the cake collapsed, which was a reason to exclude this formulation ...Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić. "Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study" in European Journal of Pharmaceutical Sciences, Elsevier BV (2023). https://doi.org/10.1016/j.ejps.2023.106557
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Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry
Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalizationSteven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti. "Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945979
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Optimizacija parametara reza rotornog bagera pri otkopavanju materijala sa povećanom čvrstoćom
Saša D. Bošković (2016-09-09)Otkopavanje materijala rotornim bagerom je veoma sloţen fiziĉko-mehaniĉki proces. Pokazatelji efektivnosti tog procesa zavise od velikog broja raznovrsnih ĉinilaca od kojih se posebno mogu istaći: fiziĉko-mehaniĉke karakteristike materijala koji se otkopava, reţim rada bagera i izbor tehnoloških parametara bloka, odreska i reza, geometrije vedrica i zuba itd. Poseban problem se javlja kod otkopavanja materijala povećane ĉvrstoće, što je ĉest sluĉaj na našim površinskim kopovima. Dimenzionisanje specifiĉne sile kopanja bagera prema manjim masama izuzetno ĉvrstog materijala je neracionalno i rešenje ...rotorni bager, parametri reza, otpor na kopanje, dinamika bagera, kapacitet, optimizacija, specifična potrošnja energije... sluĉaju dolazi do ravnomernijeg rada, ali i do pada kapaciteta, a u drugom sluĉaju je to obrnuto. Iz svega toga se izvodi zakljuĉak da je neophodno smanjiti razmak izmeĊu zuba 2, 3, 4 i 5 pogotovu i zbog toga što se debljina reza u procesu kopanja smanjuje od maksimuma do 0. Slika 2.20. Raspored ...
... domenu, i to odvojeno za horizontalni (a) i vertikalni rez (b). a) b) Slika 8.13. Uporedni prikaz ubrzanja u vremenskom domenu za horizontalni rez (a) i vertikalni rez (b) 0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 U ...
... potrošnja energije 2 3 5 4 5 8 5 8 9 Otpor materijala na kopanje 4 5 6 5 5 4 4 5 5 Dinamiĉko ponašanje bagera 8 3 4 7 7 6 7 8 8 Tehniĉki kapacitet bagera 3 4 6 4 7 8 6 8 9 Vrednosti svake alternative dobijaju se tako što se teţina dodeljena kriterijumu pomnoţi sa merom alternativne ...Saša D. Bošković. "Optimizacija parametara reza rotornog bagera pri otkopavanju materijala sa povećanom čvrstoćom" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-09-09)
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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 ...... yroBapa (m) 8,3 9,5 6,5 10,5 Maca 0arepa (t) 560 530 665 1000 Cpe;ubu npurucak Ha To (N/cm?) 10,1 9,5 12,4 11 MakcuMaJIHO J103BOJbeHH HarH0 y pajty (%) 5 3 3 3 Makcuwa;jtHo J003BOJbeHH HarHO y TpaHcnopry (%) 10 5 5 5 Munumaintu paynijyc KpiBHHe (m) 10 il - 50 Cno0oJtan yrao pe3ab»a, JIcBH/necHu ...
... 266 266 Cpe;ubu npurucak Ha To (N/cm?) 7,7 7,7 MakcHMaJIHO JIO3BOJbCHH HarH0 y pajty (%) 5 5 MakcHMaJIHO JIO3BOJbCHH HarH0 y TpaHcnopry (%) 10 10 Munumaji pajiijyc KpHBHHc (m) 12 12 SchRs800.15/1.5 (58): IIK JipMHo ERs710.17,5/13-16 (V): IIK JipMHo SRs470.20/3 (B12): IIK JipMHo Cauka 29 ...
... yoice; 2. onpyee 3a chpeuasatbe KuOatba cuoypHocHoe yoitcema; 3. KonHmpo-ana kpematba mpake no ocu, 4. koRmpoana: 0p3uHe 6y0ba, npoknusasatba mpake Ha Oy0!by, mewznepamype oomaua, aužaoicogaHe cHaze, Jame3He cCune Ha 0y0t5y;5. KkoRmpo/ta 0p3uHe mpake, 6. 3ayunu u ceemnocHu cuoHanHu ypeljaju; 7. Ocmekmop ...Тамара Андрејевић. Верификација етажних транспортера на угљеном систему – површински коп Дрмно, 2024
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Concepts for Improving Machine Learning Based Landslide Assessment
Miloš Marjanović, Mileva Samardžić Petrović, Biljana Abolmasov, Uroš Đurić. "Concepts for Improving Machine Learning Based Landslide Assessment" in Natural Hazards GIS-based Spatial Modeling Using Data Mining Techniques, Advances in Natural and Technological Hazards Research, volume 48, Springer Nature Switzerland AG 2019 (2019). https://doi.org/10.1007/978-3-319-73383-8_2
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Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support
Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović. "Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support" in Journal of Vibroengineering (2017). https://doi.org/10.21595/jve.2016.17321
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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... 71.1(4)% 23.5(3)% 5.4(5)% BaTiOa ZnFe>pOx BaFeop.12s Tio.gz5Op.92 BaTiOx/ZnFe>»Oa Tetragoonal (P4/mmm) Spinel (Fd-3m) (P6x/mmc) 1300 “C PDF # 01-079-2264 PDEF # 01-078-5429 PDF # 01-089-4605 63.5(3)% 29.6(2)% 6.9(3)%. BaFeo. ps Tio.5 Op.888 BaTiOs Nio.sZno.Fe2Oa ii )F(Ž %3/_ 13;24 604 BaTiOy ...
... head was applied to a lower temperature to 150 K. Lakeshore 340 temperature controller with hater attached at the cold head was used to gradual heating; rate of 2.5 K/min up to 400 K. Ferroelectric and leakage current measurements were conducted in the electrical field range of 5-40 kV/cm on the ...
... 01-077-9719 : 56(3)% 34(3)% Nio.o2Zno.og8O PDEF # 01-080-3507 1.0(1)% The SEM micrographs for as-prepared powders confirmed the presence of two types of particles, different in size and shape, Figure 2. The particles which belong, to the BaTiOx are bigger (0.5–1 um) in comparison to ferrite particles ...Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković. "BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties" in Inorganics, MDPI AG (2023). https://doi.org/10.3390/inorganics11020051