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Упит dcterms_creator_txt:Goya Gerardo F.

650 items

  • Optimizacija dužine strele rotornih bagera u funkciji stabilnosti kosina i efektivnosti rada na površinskim kopovima lignita Srbije

    Branko M. Petrović (2016-07-12)
    Rotorni bageri su mašine koje se u današnje vreme najviše primenjuju uprocesu masovne eksploatacije uglja zahvaljujući, pre svega, nizu tehničkoeksploatacionihprednosti u odnosu na druge vrste bagera. Raznovrsnirudarsko-tehnički zahtevi otkopavanja doprineli su razvoju nekoliko tipova ovihmašina, tako da svaki od njih ima svoje prednosti i nedostatke u odnosu nadrugi tip.Predmet istraživanja u disertaciji odnosi se na izbor optimalnekonstrukcije strele bagera i njene usaglašenosti sa uslovima radne sredine kojiće vladati na površinskim kopovima lignita Srbije, imajući u vidu složene usloveeksploatacije (velika ...
    površinski kop, parametri bloka, kapacitet, rotorni bager, strelabagera, geomehanika, stabilnost kosina, ekonomija
    ... Diskusija i zaključak. 5 PROGRAM ISTRAŽIVANJA I F A Z A S IS T E M S K A A N A LI Z A II F A Z A M O D E LI R A N JE III F A Z A O P T IM IZ A C IJ A Proces IzlazUlaz Analiza sistema ROTORNI BAGER Analiza sistema ...
    ... ugla okretanja strele bagera ka bočnoj kosini prema otkopanom prostoru pri otkopavanja donjeg reza (𝜑𝑑𝑠). Širina bloka (Slika 3.15.) iznosi: F f` Rp E 54 𝐵 = 𝐵1 = 𝐵𝑔𝑢 + 𝐵𝑔𝑠 (3.25) Širina gornjeg dela reza prema masivu je: 𝐵𝑔𝑢 = 𝑅𝑔 𝑠𝑖𝑛𝜑𝑔𝑢 ...
    ... (3.33) Slika 3.16. - Šema za određivanje dužine bloka iz uslova prilaska bagera donjoj ivici kosine bloka βc αg r hr g Rg f F z1 58 Dužina otkopavanja bloka koja proizilazi iz ograničenja dodira konstrukcije strele bagera i gornje ivice drugog reza može se odrediti ...

  • Hidrogeoekološki uslovi eksploatacije kamenih i mrkih ugljeva Srbije

    Branko R. Miladinović (2016-04-27)
    Ugalj predstavlja energent na čijoj osnovi se razvija privreda celog sveta.Zato mu se pridaje velika pažnja u eksploataciji i preradi, bez obzira na mnogeštetne uticaje na životnu sredinu, a posebno na efekat staklene bašte koji sestvara emisijom zagađujućih materija u atmosferu radom termoelektrana naugalj.U Srbiji, resurs koji se danas u najvećoj meri koristi u proizvodnjielektrične energije je ugalj i on učestvuje u proseku sa 70 %. U strukturi ukupneproizvodnje ugljeva, dominiraju lignitski ugljevi sa učešćem od 98 %, a ...
    Srbija, kameni i mrki ugalj, podzemna eksploatacija, preradauglja, rudničke vode, hemijski sastav, emisija zagađujućih materija, životnasredina
    ... površina sliva (F), korišćenjem sledeće jednačine: 227 F tQ h ⋅ = (2) gde je: t - vremenski period izražen u sekundama. Primenom jednačine (2), površina sliva iznosi: 1.6100951.6 357.0 10536.31/069.0 26 63 =⋅= ⋅⋅ = ⋅ = m m ssm h tQ F km2 ...
    ... temperature vazduha u trenutku i 0.491 0.000 F=202.20; σ=0.00; r=0.49; σ=0.00; R²=0.23 Regresionim modelom objašnjava se 23% varijanse zavisne promenljive (R²=0.23). Koeficijent korelacije iznosi r=0.49; σ=0,00. Model je statistički značajan (F=202.20; σ=0,00). Padavine u trenutku i-1 (β=0.019; ...
    ... e vazduha u trenutku i 0.047 0.000 F=353.4; σ=0.00; r=0.93; σ=0.00; R²=0.86 231 Regresionim modelom objašnjava se 86% varijanse zavisne promenljive (R²=0.86). Koeficijent korelacije iznosi visokih r=0.93; σ=0.00. Model je statistički značajan (F=353.4; σ=0.00). Priliv rudnickih voda u ...

  • Fragmentation Size Prediction of Blasted Material Using a Specialized Software for Drilling and Blasting

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić, Miljan Gomilanović (2024)
    Design and optimizing the drilling and blasting parameters, should fill the requirements for the capacity, fragmentation size, and technical characteristics of loading and transport equipment, and enable a safe work at the open pit. Besides mentioned, it also achieves the minimal impact on the environment of the open pit and decreases the negative effects on the environment, especially in the blast vibration and flyrock. To obtain the best possible blasting effects and consider all the factors, a specialized software is ...
    optimization, O-Pitblast, drilling, blasting, fragmentation size

  • Keyword Extraction from Parallel Abstracts of Scientific Publications

    Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić (2017)
    ... extraction using neighborhood knowledge. In: Proceedings of the 23rd AAAI Conference on Artificial Intelligence, pp. 855–860 (2008) 20. Liu, F., Pennell, D., Liu, F., Liu, Y.: Unsupervised approaches for automatic key- word extraction using meeting transcripts. In: Proceedings of the HLT: The Annual Conference ...

  • Automatic construction of a morphological dictionary of multi-word units

    Cvetana Krstev, Ranka Stanković, Ivan Obradović, Duško Vitas, Miloš Utvić (2010)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multiwordn units, noun phrases, query expansion
    ... biljka(q) mesožderka(v) ‘plant carnivore’); 3. The third rule is 22nd in the sequence and allows the components to disagree in gender (e.g. roman(m) reka(f) ‘novel fleuve’). As a consequence, for noun-noun MWUs in which both nouns do not agree in all grammatical categories, the other rule producing the nc ...
    ... Acadêmica (2009) 51–84 9. Krstev, C., Vitas, D., Savary, A.: Prerequisites for a Comprehensive Dictionary of Serbian Compounds. In Salakoski, T., Ginter, F., Pyysalo, S., Pahikkala, T., eds.: FinTAL. Volume 4139 of LNCS., Springer (2006) 552–563 10. Savary, A.: Recensement et description des mots composés ...

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)

  • From DELA Based Dictionary to Leximirka Lexical Database

    Biljana Lazić, Mihailo Škorić (2020)
    In this paper, we will present an approach in transforming Serbian language Morphological dictionaries from a DELA text format to a lexical database dubbed Leximirka. Considering the benefits of storing data within a database when compared to storing them in textual documents, we will outline some of the functionality that the database has made possible. We will also show how hand-made rules that use category labels lexical entries are marked with can be used to link lexical entries. ...
    Morfološki rečnici, jezički resursi, Leksimirka
    ... occur in the DELAF dictionary. Examples of such grammar codes are “1” for the nominative case, “2” for the genitive case, “m” for the masculine gender, “f” for the feminine gender, etc. The MultilingualLabels table was created with the idea of pre- senting meta-language that is used for description of labels ...
    ... and both male and female gender and it is stored in the Form table. The combination of grammatical categories (”ms” – (m) male (s) singular and (fs) – (f) female (s) singular) is stored in the FormGramCats table while the separated categories are stored in the FormGramCatProperties table. Lexical entries ...

  • Development and Evaluation of Three Named Entity Recognition Systems for Serbian - The Case of Personal Names

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2019)
    In this paper we present a rule- and lexicon-based system for the recognition of Named Entities (NE) in Serbian news paper texts that was used to prepare a gold standard annotated with personal names. It was further used to prepare training sets for four different levels of annota tion, which were further used to train two Named Entity Recognition (NER) sys tems: Stanford and spaCy. All obtained models, together with a rule- and lexicon based system were evaluated on ...
    NER, Named Entity Recognition Systems, Serbian, Personal Names
    ... e Queen Viktorije Victoria Table 1: Examples of types of personal names and their tags; M - masculine, F - feminine personal names defining different mappings of XML tags. These mappings are named and represented in Table 2. Different versions of GOLDPERS ...
    ... evaluate the correspondence between one annotation from the first file and one annotation from the second file, calculation of precision P , recall R and F - measure in Gemini comes in three different fla- vors: weak an annotation of the first file will be con- sidered as corresponding to an annotation of ...

  • Classification of mining waste landfills according to legislation in Serbia

    Dragana Nišić, Uroš Pantelić, Nikoleta Aleksić, Neda Nišić (2021)
    rudarski otpad, jalovina, uredba, deponija, kategorija A, klasifikacija
    ... affected soils. Water, Air, & Soil Pollution, vol. 228, no. 7, pp.1-12., 2017. [16] Sánchez, Luis Enrique, K. Alger, L. Alonso, F. Barbosa, M. C. W. Brito, F. V. Laureano, P. May, H. Roeser, and Y. Kakabadse: Impacts of the Fundão https://-ec.europa.eu/-environment/pdf/-wa-ste/mining/mwf ...

  • Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications

    Darko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    примарне сировине, минералогија, физичко-механичка својства, технолошка својства, наука о материјалима

  • Regulacija nivoa tečne faze u vertikalnim separatorima

    Katarina Šoštarić (2024)
    Ovaj diplomski rad bavi se regulacijom nivoa tečne faze u vertikalnim separatorima u industriji nafte i gasa. U radu su istraženi različiti metodi merenja nivoa, uključujući plovke, ultrazvučne i radarske senzore. Radarski senzori su se pokazali kao najefikasniji u teškim radnim uslovima, zahvaljujući njihovoj visokoj preciznosti i pouzdanosti. Rad uključuje teoretski pregled metoda merenja nivoa, detaljno poređenje prednosti i nedostataka različitih senzora, kao i studiju slučaja implementacije radarskog senzora u vertikalnom separatoru. Analiza rezultata i preporuke za buduća istraživanja ...
    Merenje nivoa, Vertikalni separator, Radarski senzori, Ultrazvučni senzori, Industrija nafte i gasa
    ... Kada se mere nivo praškastih i sitnozrnastih materijala, vibracione viljuške se ne ugrađuju u delovima rezervoara gde zaostaje materijal. / / [f} || _ F _~ Zaštita od sunca [ Napajanje o = -7 _ BSVACdo265VAC, — 50/60Mzr | Praškast | materijal Trožilni kabi Slika 17. Fibracione viljuške ...

  • Примена беспилотне летелице „Wingtra One“ при решавању геодетско-мерачких задатака на руднику угља „Костолац“

    Милица Лунгић (2024)
    Беспилотне летелице су нашле широку примену у разним гранама индустрије и привреде данашњице, укључујући геодетско-мерачка снимања. Са усавршавањем самог начина подршке хардвера и софтвера, дошло је до могућности у напредовању развоја самих беспилотних летелица. Самим тим се отворила сфера могућности да у релевантно кратком временском периоду дође до самог снимања, обраде и израде поузданих ортофото модела, дигиталних модела надморских висина (ДЕМ), дигиталних модела површи (ДСМ), 3D модела површи.У овом раду је детаљније објашњен сам принцип рада беспилотнелетелице ,,Wingtra One,, ...
    БАС систем, беспилотна летелица Wingtra, план лета, израда модела, рудник угља „КостолацБАС систем, беспилотна летелица Wingtra, план лета, израда модела, рудник угља „Костолац''
    ... HaJ)IMOpcke BHCHHC 19 Ne leteti u slučaju | w ak & Sneg ili kiša (Q) > B m/s (18 mph)* -10 do +40 •C >25O0O m** (>8200 (1& do 104 F) ft) Jak konstantan Ekstremne Velika visina vetar* temperature Cnuka 5.4: IIpuka3 ycnoga kada nemenuua He Mooice Oa nemu VommkKo HeMa MoryhHocTu ...
    ... 0HOnaorTeky Pynapcko-reonomior (bakyurera Jta y JiHrHTanHH peno3HTOpHjyM yHece MOJ 3aBPIIIHH pajl 0J1 HaCJIOBOM: //OMMeHa BeCDMAOTHe AeTONMO, O '/\"'“/'f/?irx One MoOM. Delaboboy V JeoaeTCko – MOOQ9KMNrx anaTeoka Ha GyONMk9 „yf/oa ,k';““m/au\ KOJBH jJe MOJe ayTOPCKO JIeJIO. 3aBplHH pajl Ca CBHM ...

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje

  • Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae

    Hans Peter Nytoft, Geir Kildahl-Andersen, Sofie Lindström, Frode Rise, Achim Bechtel, Danica Mitrović, Nataša Đoković, Dragana Životić, Ksenija A. Stojanović (2019)
    Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMRspectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10?20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270?146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant ...
    Geochemistry and Petrology

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic

  • Strategic Environmental Assessment in the Application of Preventive Protection for Wind Farm Noise—Case Study: Maestrale Ring Wind Farm

    Boško D. Josimović, Aleksandar Cvjetić, Božidar Manić (2021)
    Determining the spatial position of wind turbines is the initial and most important phase in the development of a wind farm project. In this sensitive phase, all potential problems that may arise in the later stages of project development should be prevented by means of spatial and urban planning instruments. This makes it possible to achieve maximum use of the potential of wind in a particular space and, thus, fulfil the technical and economic requirements of the project while ...
    Energija,energetski inženjering i elektroenergetska tehnologija,obnovljivi izvori energije, održivost i životna sredina,električni i elektronski inženjering,kontrola i optimizacija,inženjering
    ... According to the Criteria from Table 2.) of the Impact Explanation Unit 1-Čantavir east (46 wind turbines) T o r ed u ce e xp o su re o f th e p o p u la ti o n t o i n cr ea se d n o is e le v el s 0 In units 1 and 2 no increase in the level of noise above LVNI is ...
    ... Technol. Assess. 2016, 18, 48–58. Energies 2021, 14, 6174 14 of 15 21. Gallo, P.; Fredianelli, L.; Palazzuoli, D.; Licitra, G.; Fidecaro, F. A procedure for the assessment of wind turbine noise. Appl. Acoust. 2016, 114, 213–217. 22. Lenchine, V. Assessment of amplitude modulation in e ...
    ... , K. The impact of supporting tower on wind turbine noise emission. Appl. Acoust. 2019, 155, 260–270. 41. Adewumi, G.; Nyamayoka, L.T.E.; Inambao, F. Reducing infrasound and low frequency noise from wind turbine blades and rotors using ANC. Renew. Bioresour. 2015, 3, 3. 42. Zajamšek, B.; Hansen ...

  • Распоред минских бушотина код израде хоризонталних и косих подземних просторија

    Јеремија Баралић (2024)
    Овај рад бави се анализом и прорачуном расподеле минских бушотина приликом израде хоризонталних и косих подземних просторија у оквиру рударских операција. Главни циљ рада је да пружи јасне смернице за ефикасно и безбедно извођење бушаћко-минерских радова у различитим геолошким условима, уз посебан акценат на оптимизацију расподеле бушотина и прорачун потребне количине експлозива. У раду је детаљно обрађено неколико кључних аспеката: врсте минских бушотина (заломне, помоћне и периферне), фактори који утичу на њихов распоред, као и методе за прорачун оптималне ...
    распоред минских бушотина, контурно минирање, прорачун експлозива, подземне просторије
    ... TyCTHHC CTEHC, BCJIHUHHC (bparMeHaTa HaKOH MHHHPpaMba H c(bKaCHOCTH CKCIIO3HJe: Q-K-V·}f • TIaecy: • _ K - cnena(bHuHa eHeprHja 3a JIOM cTeHe (J/m3), • V - naanpeMHHa cTeHe KOja Ce JIOMH (m3), • f-— (baKTOp cHrypHOcTH (KoOjH Ce MO)Ke KpeTarTH oJ 1,1 no 1,5, y 3aBHCHOCTH OJI yCJIOB4). ...
    ... XOJIHHKAa IIHpHHe IHpH BpXy 2,8m , npu mojty 3,0m H BacHHe 2,6m , aKoO Ce XOJIHHK pajuH KpO3 BepTHKaJIHO ycJ1OjeHe cTeHe Ca Koe(buniijeHTOM uppcrohe f=8 ; Opoj MHHa M3OHocH N=22 ; mpeuHMK maTpoHe 38mm , a pajHa CHOCOOHOCT npHMemeHor eKcnino3HBa H3HocH 380 cm3. Pemreme: Ha ocHoBy nomoxkaja cHOjeBa ...

  • Projection of SO2 emissions in coal power plants in Serbia

    Aleksandar Madžarević, Predrag Jovančić, Stevan Đenadić, Filip Miletić, Miodrag Ristović, Miroslav Crnogorac (2023)
    The production of electricity in the countries of South-Eastern Europe (SEE) was mainly related to the use of coal, predominantly lignite. The total installed capacity of thermal power plants using coal in these seven countries is 17.813 MW, distributed in 31 thermoblocks. The mentioned plants are the dominant pollutant emitters in all observed countries. Data on the largest emitters in the countries of the European Union and a comparison with SEE countries were collected. The calculation of emissions of ...
    енергeтика, емисије, СО2, угаљ, електране
    ... emission without desulfurization H r_ M i L_ ___------">~ ~.~ E [] TT C--- ” TO------ u [ {average emission 86.424 tSO2) - period 2020-2040 | 80 F as 60 10 j 40 ——Total calorific value of used coal, GJ 57 Annual emission of S02 [t] Projection emission with desulfurization 20 {average ...

  • Geotehnički uslovi izgradnje tunela „Debelo brdo“ na autoputu E-80 Niš - Pločnik

    Dragoslav Rakić, Radojica Lapčević, Irena Basarić Ikodinović, Dragan Lukić (2022)
    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 ...
    Tunel „Debelo brdo“, Geotehnički parametri, Privremene kosine, Šipovi, Podgrada.
    ... 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 mase u predelu kalote tunela Korak 5 Formiranje zone poduhvatne podgrade, ugradnjom i ...

  • Smanjenje sleganja plitkih temelja primenom mikrošipova

    Slobodan Ćorić, Dragoslav Rakić (2021)
    Mikrošipovi su šipovi malog prečnika koji se grade tako što se u tlu specijalni postupkom formira bušotina koja se zatim armira i injektira. Njihov prečnik je najčešće 150 – 300 mm, a dužina može da bude i više desetina metara. Mikrošipovi mogu da se grade u svim vrstama tla i mogu da budu vertikalni i kosi. Oni se, stoga, koriste kao zamena za konvencionalne šipove i ankere. Primena mikrošipova u fundiranju predstavlja jedan savremeni način izgradnje i sanacije temelja/objekata. ...
    mikrošipovi, sleganje plitkih temelja i mikrošipova, krutost tla i mikrošipova