Претрага
812 items
-
Развој модела употребног квалитета помоћне механизације на површинским коповима лигнита
Драгица Јагодић Крунић (2021)Тренутно стање помоћне механизације на површинским коповима лигнита је незадовољавајуће узроковано пре свега старошћу и неблаговременом заменом машима услед чега је расположивост недовољна а трошкови експлоатације и одржавања високи. Тренутно стање и захтеви који се постављају пред ове машине указују на неопходност оптимизације процеса управљања помоћном механизацијом. Одређивање оптималног времена замене и преосталих могућности је најодговорнији управљачки задатак који треба да буде заснован на свеобухватном сагледавању економских, техничких и других узрочно последичних веза. Са економског аспекта гледано треба одржавати ...помоћна механизација, употребни квалитет, ефективност, расположивост, сигурност функционисања, ризик, трошкови животног циклуса, фази логика, Монте Карло метода... – тип С ЛОГИСТИЧКА ПОДРШКА ОДРЖАВАЊУ (MS) Е к с п е р т ∑ 𝑀𝑆(𝐿𝑉)51 5 М А Ш И Н А / О Ц Е Н А 1 2 3 4 5 С1 M S (L V ) ''ОДЛИЧНА'' ''ДОБРА'' 0,5 0,4 0,4 0,4 0,4 0,42 ''ПРОСЕЧНА'' 0,5 0,6 0,6 0,6 0,6 0,58 ''ПРИХВАТЉИВА'' ''ЛОША'' С2 M S (L V ) ...
... j 1 2 3 4 5 С(1) С(2) С(3) С(4) С(5) ''ЕКСТРЕМНО ВИСОКИ'' ''ВИСОКИ'' ''УМЕРЕНИ'' ''НИСКИ'' ''ВЕОМА НИСКИ'' РА СП О Л О Ж И ВО СТ (А ) j 1 А(1) ''ЛОША'' АС(1) АС(1) АС(1) АС(1) АС(1) 2 А(2) ''ПРИХВАТЉИВА'' АС(1) АС(1) АС(1) АС(1) АС(1) 3 А(3) ''ПРОСЕЧНА'' АС(2) АС(2) АС(3) ...
... ПОДРШКА ОДРЖАВАЊУ (MS) Е к с п е р т ∑ 𝑀𝑆(𝐿𝑉)51 5 М А Ш И Н А / О Ц Е Н А 1 2 3 4 5 А1 M S (L V ) ''ОДЛИЧНА'' ''ДОБРА'' 0,9 0,5 0,6 0,8 0,6 0,68 ''ПРОСЕЧНА'' 0,1 0,5 0,4 0,2 0,3 0,30 ''ПРИХВАТЉИВА'' 0,1 0,02 ''ЛОША'' А2 M S (L V ) ''ОДЛИЧНА'' ...Драгица Јагодић Крунић. Развој модела употребног квалитета помоћне механизације на површинским коповима лигнита, Београд : [Д. Јагодић Крунић], 2021
-
Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software
The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić. "Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software" in Podzemni radovi, Beograd : Rudarsko-geološki fakultet (2024)
-
The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>
The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...... independent experiments performed in triplicate. RIGHTSLIMKMK&~Ž --| zj g s P o 5 | Š o S - s = 5 j| E > F3 E o 9 Š Đ 8 8 -| = P F-| |- o al Ch em is tr y Do wn lo ad ed fr om -| -} P |l = & Š |-5} |j 6 | || F| 5 -i Fo r pe rs on al us e on ly . in ...
... different Al ions concentrations at pH2. RIGHTSLIMKMK&~Ž --| zj g s P o 5 | Š o S - s = 5 j| E > F3 E o 9 Š Đ 8 8 -| = P F-| |- o al Ch em is tr y Do wn lo ad ed fr om -| -} P |l = & Š |-5} |j 6 | || F| 5 -i Fo r pe rs on al us e on ly . 1006 ...
... rinsing in distilled-deionised RIGHTSLIMKMK&~Ž --| zj g s = 6 = || Fa Š F1 || -| |-s} e --| = > 5 E 8 o 9 H i 5 | 9 -i : i:| |-i | P 3 ' o F| FI o [= i F Š |} i Jo ur al of En zy me In hi l Fo r pe rs on al us e on ly . 1004 I7 M. Pavelhic ...Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić. "The influence of Al3+ion on porcine pepsin activityin vitro" in Journal of Enzyme Inhibition and Medicinal Chemistry, Informa UK Limited (2008). https://doi.org/10.1080/14756360701841095
-
New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)
Nevenka Đerić, Nataša Gerzina (2014)... Geologia Croatica 67/3 r č| F3 |E -i | s s|s = LNKOS s|s žš|a& Hi F| t [} = s lo ME 5 fj FH s Fj s|m El 5 F| s [5] r3 - |H s E 20 s & Š s s < šŠ Age Description Sample E 9 8 7 6 BR 1/4 5 |- BR 1/3 41s |- s e 30 j BR 1/2 2– 1- 0 j BR 1/1 Legend ...
... Sediments in the Stru- ganik Section (Western Serbia).- Stratigraphy and Geological Cor- relation, 22/2, 202—218. CSONTOS, L., GERZINA, N., HRVATOVIĆ, H., SCHMID, S. & TO- MLJENOVIĆ, B. (2003): Structure ofthe Dinarides: a working mod- el.– Ann. Univ. Sci. Budapest., Sect. Geol., 35, 143—144 ...
... – Ann. Geol. Penins. Balk., 72, 87—100. GERZINA, N. & CSONTOS, L. (2003): Deformation sequence in the Vardar Zone: surroundings of Jadar Block; Serbia.– Ann. Univ. Sci. Budapestincnsis, Sect. Geol., 35, 139-140. KARAMATA, S. (2006): The geological development of the Balkan Pe- ninsula related ...Nevenka Đerić, Nataša Gerzina. "New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)" in Geologia Croatica (2014)
-
On the distribution modulo 1 of the sum of powers of a Salem number
Dragan Stankov (2016)It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "On the distribution modulo 1 of the sum of powers of a Salem number" in Comptes rendus Mathematique (2016). https://doi.org/10.1016/j.crma.2016.03.012
-
E-Connecting Balkan Languages
In this paper we present a versatile language processing tool that can be successfully used for many Balkan languages. This tool relies for its work on several sophisticated textual and lexical resources that were developed for most of Balkan languages. These resources are based on several de facto standards in natural language processing.... lang="en"> <s id="Verne80days.n2941"> Between Omaha and the Pacific the railway crosses a territory which is still infested by Indians and wild beasts, and a large tract which the Mormons, after they were driven from Illinois in 1845, began to colonise.s><s id="Verne80days ...
... l'Illinois.s><s id="Verne80days. n2941"> Između Omahe i Tihog okeana pruga prolazi kroz predeo u kome još ima Indijanaca i divljih zveri - prostranu zemlju koju su počeli naseljavati mormoni oko 1845. godine, kada su ih prognali iz države Ilinois.s> ...
... <s id="Verne80days. n2941"> Ανάμεσα στην Ομάχα και στον Ειρηνικό, το τρένο διασχίζει περιοχές όπου συχνάζουν ακόμα Ινδιάνοι και αγρίμια - τεράστια εδαφική έκταση την οποία αρχισαν να αποικίζουν οι μορμόνοι μετά το 1845, οπότε κυνηγήθηκαν από το Ιλινόις.s><s id=" ... Cvetana Krstev, Ranka Stanković, Duško Vitas, Svetla Koeva. "E-Connecting Balkan Languages" in Proceedings of the Workshop Workshop on Multilingual resources, technologies and evaluation for Central and Eastern European Languages, 17 September 2009, eds. C. Vertan, S. Piperidis, E. Paskaleva and Milena Slavcheva, Borovets, Bulgaria : Association for Computational Linguistics Stroudsburg, PA, USA (2009)
-
Superstructure of Mullite-type KAl9O14
Lazić P. Biljana, Krueger H., Kaindl R., Perfler L., Kremenović Aleksandar, Cvetković Vladica, Withers R.L. (2013)Lazić P. Biljana, Krueger H., Kaindl R., Perfler L., Kremenović Aleksandar, Cvetković Vladica, Withers R.L.. "Superstructure of Mullite-type KAl9O14" in Chemistry of Materials 25 no. 3, Washington, United States:American Chemical Society (2013): 496-502. https://doi.org/10.1021/cm3038476
-
Збирка задатака из Механике 1 и Отпорности материјала
Aна Петровић, Инес Гроздановић (2023)... Be3y Rg = S Koja ce y6auyje y Tpehy jenHauuMHy. Beaa u rnpBe jenHauuHe y6auyje ce y Tpehy M oHa nocTaje: || —S(L sin a) —G(Žcosa) +S(lsina) = 0 19 36upka aanarTaka v3 MexaHuke 1 u OrnopHocTu MaTepujana l S(l—ll)sina=G(— 2 COS Cl) VMlapauyHaBajy ce peakuuja 3wna Ry M cvna y yxxeTy S (jenHake ...
... (jenHake cy Ha OCHOBy rpBe jenHauuHe): || 1 G =5Cos Q 5 V3 Ri=S= 2 _ 2. :3· (I — l,) sin q \/š V3 || = 100V3 = 173,2N O 3anarak 1.6 XoMoreHa rnaTka kyrmna D nonynpeuHMka R = V3I u cor1tcTBeHe TeXXMHe Q, ocnakoa ce Ha rpeny 4B nyxuHe 3l M cortcTBeHe TeXxXMHe G = Q. Kyrny y paBHOTe)XXHOM ...
... urran je uenMuHM, na ce aHa na je E = 2,1· 104% = cohnst. TlovepaW»a kapakrepucTMuHWX rpeceka cy: A4.=0 DO OB Ac = Ag +g,l,_·[ll,l,l _ Ž,Žl (—ZŽŽ(ZZ) __q ŽŽ LOLO L O _N _2P_P Ta 24 A _Nu_-2P _ _„P OA A ĆA Nn GP „P III == =3= An 24 A 49 36upka aanaTaka v MexaHuke 1 u OrnopHocTu ...Aна Петровић, Инес Гроздановић. Збирка задатака из Механике 1 и Отпорности материјала, Београд : Универзитет у Београду, Рударско-геолошки факултет, 2023
-
Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions
Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák. "Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions" in Journal of Solid State Chemistry, Elsevier BV (2015). https://doi.org/10.1016/j.jssc.2015.06.027
-
Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit
... 138.33[kN/m{|, • volume weight y = 26.26[kN/ m{l, • compressive strength O, = 80.808{MPa], • tensile strength O = 7.590[MPa], • velocity of ongitudinal elastic waves C, = 6661.00[m/ s] , • velocity of transverse elastic waves C, = 2852.67[m/ s] ; = 62.46[GN/m2], • dynamic elasticity modulus ...
... Malbašić, V.; Stojanović, L. Determination of Seismic Safety Zones during the Surface Mining Operation Development in the Case of the “Buvač” Open Pit. Minerals 2018, 8(2), pp. 71. 203 Medvedev S.V. Seismika gornwh vzrwvov, Nedra, Moscow, Russia, 1964; pp. 42-43. Lutovac, S.; Gluščević, B.; Tokalić ...
... given, as well as calculated rock mass oscillation velocities from v,, to v,s , for models 1 — 5. Table 3. Review of registered and calculated rock mass oscillation velocities for models 1-5 V, [cm/s| a [cm/s V;s [cm/s] 21.8117 55.3430 55.9536 57.6390 57.9760 59.3234 59.6614 61.8540 ...Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac. "Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit" in 9th International Conference Mining and Environmental protection MEP, 24 – 27 May 2023, Sokobanja, Serbia, Belgrade : University of Belgrade-Faculty of mining and geology (2023)
-
Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina
Tina Dašić, Ljiljana Vasić (2020)Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry,Global and Planetary ChangeTina Dašić, Ljiljana Vasić. "Flood protection and water utilization of karst poljes: example of Gatačko Polje, Eastern Herzegovina" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-08987-4
-
Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations
The Vršac Mts. in NE Serbia represent the key area to investigate structural relations between the Northern Serbo-Macedonian Subunit and Supragetic Unit of the Dacia Mega-Unit. The geodynamic events during the Variscan orogeny in the Late Paleozoic colligated the two units and led to their metamorphic differentiation. The Late Cretaceous extension exhumed the medium-grade Serbo-Macedonian metamorphic rocks and structurally juxtaposed them against the low-grade metamorphosed basement of the Supragetic Unit along an E-dipping shear zone, which outcrops in the ...severna srpsko-makedonska subjedinica, supragetikum, kinematska analiza, multifazna ekstenzionalna deformacija... o n e S redna G ora S redna G ora Zone Zone S o u t h C a r p a t h i a n s S o u t h C a r p a t h i a n s ZagajicaDepression ZagajicaDepression P an nonian Basin P an nonian Basin S e r b ia n C a r p a t h i a n s S e r b ia n C a r p a t h i a n s B a l k a n i ...
... i d e s B a l k a n i d e s M o e s i a n M o e s i a n P m l a t r f o P m l a t r f o T F T F TFTF C F C F M o r a v a V a l l e y C o r r i d o r M o r a v a V a l l e y C o r r i d o r Jastrebac Mts.Jastrebac Mts. Vršac Mts.Vršac Mts. Western Vardar Adr ...
... Oligocene - Miocene SMM SG SMM-F SMM-L SG-F SG-L foliation lin ea tio n SMM SG SMM-F SMM-L C re ta ce ou s = pr es en t- da y SG-F SG-L C re ta ce ou s = pr es en t- da y C-F SMM-F SMM-L C-L Prese nt-d ay C re ta ce ou s Ol-M rotation Fig. 6. Mechanism of the ...Uroš Stojadinović, Nemanja Krstekanić, Bojan Kostić, Marija Ružić, Aleksa Luković . "Tectonic evolution of the Vršac Mts. (NE Serbia): Inferences from field kinematic and microstructural investigations" in Geologica Carpathica, Central Library of the Slovak Academy of Sciences (2021). https://doi.org/https://doi.org/10.31577/GeolCarp.72.5.3
-
3D modeling and monitoring of karst system as a base for its evaluation and utilization: a case study from eastern Serbia
Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeSaša Milanović, Zoran Stevanović, Ljiljana Vasić, Vesna Ristić-Vakanjac. "3D modeling and monitoring of karst system as a base for its evaluation and utilization: a case study from eastern Serbia" in Environmental Earth Sciences, Springer Science and Business Media LLC (2013). https://doi.org/10.1007/s12665-013-2591-9
-
Modeliranje sistema upravljanja zaštitom životne sredine u rudarsko-energetskim kompleksima
Jelena R. Malenović - Nikolić (2016-07-12)Efikasnost funkcionisanja sistema upravljanja zaštitom životne sredine u rudarskoenergetskimkompleksima zavisi od stepena sprovođenja usvojene politike zaštiteživotne sredine i primene preventivnih mera zaštite životne sredine. Nedostatakfinansijskih sredstava za unapređivanje tehnologije eksploatacije, transporta, pripreme iprerade energetskih mineralnih sirovina u našim rudarsko-energetskim kompleksima,negativno utiče na ostvarivanje ciljeva zaštite životne sredine, a posledice radnihaktivnosti rudarsko-energetskih kompleksa dovode do smanjenja nivoa kvalitetavazduha, vode i zemljišta...rudarsko-energetski kompleks, životna sredina, sistem upravljanja,višekriterijumsko odlučivanje, modeliranje... F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M ...
... 18.11.16 S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F ...
... pepela i šljake [186]. Ispitivanja karakteristika otpadnih voda s deponije pepela i šljake TE „Kostolac”, pokazuju da su prelivne otpadne vode sivkaste ili sive alkalno neutralne (7,79-8,12 pH) [187], s vrednošću HPK od 4,32-25,82 mg/l [187]. Utvrđeno je prisustvo organskih i neorganskih materija ...Jelena R. Malenović - Nikolić. "Modeliranje sistema upravljanja zaštitom životne sredine u rudarsko-energetskim kompleksima" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-07-12)
-
Metalogenija jurskih karstnih boksita rudnih rejona Vojnik-Maganik i Prekornica, Crna Gora
Slobodan Radusinović S. (2017)Slobodan Radusinović S.. Metalogenija jurskih karstnih boksita rudnih rejona Vojnik-Maganik i Prekornica, Crna Gora, Beograd:Rudarsko Geološki Fakultet, 2017
-
Long-term planning methodology for improving wood biomass utilization
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. ...Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković. "Long-term planning methodology for improving wood biomass utilization" in Energy, Elsevier BV (2019). https://doi.org/10.1016/j.energy.2019.03.105
-
Praćenje efekata rekultivacije degradiranih prostora na površinskim kopovima RB Kolubara
Zoran S. MILENKOVIĆ (2016)Zoran S. MILENKOVIĆ. Praćenje efekata rekultivacije degradiranih prostora na površinskim kopovima RB Kolubara, Beograd:Rudarsko-geološki fakultet, 2016
-
Hidrogeološke karakteristike Mačve i Pocerine s aspekta melioracija u poljoprivredi odvodnjavanja i navodnjavanja
Milojko Lazić (1985)Milojko Lazić. Hidrogeološke karakteristike Mačve i Pocerine s aspekta melioracija u poljoprivredi odvodnjavanja i navodnjavanja, Beograd:Rudarsko Geološki Fakultet, 1985
-
Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention
Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol InjectionMilica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović. "Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention" in Underground Mining Engineering, Beograd : Rudarsko-geološki fakultet (2023)
-
Prilog određivanju parametara u vezi sidrenja u horizontalnim prostorijama s naročitim obzirom na dužinu i raspored sidara
Dragan Marković (1973)Dragan Marković. Prilog određivanju parametara u vezi sidrenja u horizontalnim prostorijama s naročitim obzirom na dužinu i raspored sidara, Beograd:Rudarsko-geološki fakultet, 1973