Претрага
425 items
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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... 164.3 (7) O1v—Si1—O3 109.4 (2) �2 Symmetry codes: (i) x + 1 2, y + 1 2, z; (ii) x, �y, �z + 1; (iii) �x, �y, z � 1 2; (iv) � x � 1 2, � y � 1 2, z � 1 2; (v) x � 1 2, �y � 1 2, �z + 1; (vi) �x + 1 2, �y � 1 2, �z + 1; (vii) �x, y, �z + 3 2. Table 6 Bond valences ij (v. u.) for polymorph �0-K3YbSi2O7 ...
... = 9.9201 Å, c = 13.9339 Å). Atom Wyckoff site x y z Yb1 4a (0,0,0) 0 0 0.5 K1 8f (0,y,z) 0.5 0.83333 0.5918 Si1 8f (0,y,z) 0.5 0.16667 0.6322 K2 4c (0,y,14) 0 0 0.75 O1 16h (x,y,z) 0.7318 0.0894 0.5959 O1_2 8f (0,y,z) 0.5 0.3212 0.5959 O2 4c (0,y,14) 0.5 0.16667 0.75 Table 8 The displacement field ...
... formed by a regular alternation of two types of layers, which Symmetry codes: (i) x + 3, y + 4 2; (ii) x, —y, —z + 1; (iii) —x, -y, 2 -— } (iv) —-x-—3-y-— 32-5) xX -4-V— 3-2 t+ bh (i) x43, -y —3, -z + (vii) —x, y, -z +3. ie Table 6 Bond valences vj (v. u.) for polymorph f’-K3YbSi,O;. Ki" K2" Yb" si ...Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović. "Low-temperature phase transition and magnetic properties of K3YbSi2O7" in Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, International Union of Crystallography (IUCr) (2021). https://doi.org/10.1107/S2052520621006077
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Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules
The stability analysis of homogeneous rock slope following the Hoek–Brown failure criterion under the hypothesis of different flow rules is performed based on limit equilibrium and finite element methods. The applied failure criterion is the generalized Hoek–Brown that can be introduced as a shear/normal function in analysis applying different flow rules. The results are compared with those obtained by the application of equivalent shear strength parameters of the Mohr–Coulomb criterion, considering that this is still the most widely used ...Kružna klizna površ, Huk-Braunov kriterijum loma, Kriterijum popuštanja, Smičuća/normalna funkcija, Nivo napona, Verovatnoća i parametarska analizaSvetlana Melentijević, Zoran Berisavljević, Dušan Berisavljević, Claudio Olalla Marañón . "Rock slope stability analysis under Hoek–Brown failure criterion with different flow rules" in Bulletin of Engineering Geology and the Environment , Springer (2024). https://doi.org/10.1007/s10064-024-03667-0
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Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit
... R and rock mass oscillation velocity Y : 202 • muodell: ,= 0.9843 for total of 12 data (there is a strong correlation between R and y , given in the Equation (11)). • model2: , = 0.8487 fortotalof 11 data (there is a strong correlation between R and y , given in the Equation (12)). • model3: ...
... correlation between R and y , given in the Equation (13)). • model4: op, =0.9852 fortotalof 12 data (there is a strong correlation between R and y , given in the Equation (14)). • model5: o,. =0.8537 fortotalof 11l data (there is a strong correlation between R and y , given in the Equation (15)) ...
... as follows: • YV, —rock mass oscillation velocity horizontal transversal component, • V, — rock mass oscillation velocity vertical component, • Y, — rock mass oscillation velocity horizontal longitudinal component. Based on that, maximum, i.e., resulting rock mass oscillation velocity V, can be ...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)
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Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites
Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković (2023)To investigate the effect of synthesis procedure and sintering temperature on the functional properties of perovskite/spinel ceramics, BaTiO3/CoFe2O4 composites were prepared by thermal decomposition, coprecipitation, and microemulsion method, and sintered at 1150°C and 1300°C. The phase composition and morphology of as-prepared powders as well as sintered ceramics were thoroughly examined by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). The dielectric and ferroelectric measurements were performed in detail. Generally, the ...Marija Šuljagić, Aleksandar Kremenović, Ivan Petronijević, Adis Džunuzović, Miljana Mirković, Vladimir Pavlović, Ljubica Anđelković. "Understanding the effect of synthesis and sintering temperature on the functional properties of barium titanate/cobalt ferrite composites" in Science of Sintering (2023). https://doi.org/10.2298/SOS220512013S
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‘Blue-’ and ‘Brown-speckled’ pottery from Qalhât, the Sultanate of Oman (13–16th centuries): Comparison with traditional Omani 19–20 century productions
Representative ‘Blue speckled’ (13–16th centuries) and ‘Brown speckled’ (13–21st century) wares recovered from the excavations in Qalhât or collected around Bahlâ city (Sultanate of Oman) were characterized by XRPD, SEM-EDS, Raman/optical microspectroscopy, and thermal expansion. Minerals present in the body (quartz, augite and albite as major phases, calcite, dolomite, rutile, anatase, phosphate, hematite and magnetite as minor phases) were identified by XRPD and/or Raman spectroscopy. SEM-EDXS microanalysis was performed on the glazes in order to compare their composition, especially ...Liliana Gianni, Hélène Renel, Aleksandar Kremenović, Philippe Colomban. "‘Blue-’ and ‘Brown-speckled’ pottery from Qalhât, the Sultanate of Oman (13–16th centuries): Comparison with traditional Omani 19–20 century productions" in Boletín de la Sociedad Española de Cerámica y Vidrio, Elsevier BV (2020). https://doi.org/10.1016/j.bsecv.2020.06.005
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Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta
Vesna Cvetkov (2020)... postane značajan alat u arheologiji. Smatra se da su istra- 16 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e živači Laboratorije za arheologiju i isto- riju umetnosti Univerziteta ...
... veza- ne za iskopavanje i premeštanje gornjih slojeva tla. 18 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e Otklanjanje asimetrije magnetnih anomalija Magnetometri mere intenzitet ...
... nakon primene postupka RTP (linija izvučena sa kvadratićima) 20 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e Slika 3. Karte magnetih anomalija pre (leva kolona) i nakon postupka ...Vesna Cvetkov. "Značaj geografske širine za lociranje uzročnika magnetnih anomalija kod prospekcije arheoloških lokaliteta" in Aktuelna interdisciplinarana istraživanja tehnologije u arheologiji jugoistočne Evrope: Zbornik radova, Prvi skup Sekcije za arheometriju, arheotehnologiju, geoarheologiju i eksperimentalnu arheologiju Srpskog arheološkog društva, Beograd, 28.02.2020. , Beograd : Srpsko arheološko društvo (2020)
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Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia
The results of material entrainment analysis in RAMMS debris flow software, as well as numerical models of final flow heights for two case studies from the Republic of Serbia are presented. Both of debris flow cases started with initial sliding of huge volume block, prolonging to behave as flowing process. Results of the analysis showed that entrainment material affects final results of transportation model, runout distance, deposition area and volume of debris flow. In both cases entrainment volume is very ...Jelka Krušić , Biljana Abolmasov, Miloš Marjanović. "Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia" in Understanding and Reducing Landslide Disaster Risk. WLF 2020. ICL Contribution to Landslide Disaster Risk Reduction, Springer, Cham (2021). https://doi.org/10.1007/978-3-030-60706-7_25
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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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Terenska nastava iz geofizike: Arheološki lokaliteti na području Trstenika
... Slika 1. Geografski položaj istraživanih arheoloških lokaliteta 32 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e Lokalitet, koji je geofizički naj- duže ispitivan, od 2016 - 2019 ...
... arheološka sondа (Марковић и др., 2017; Вучковић и др., 2017) 34 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e - Na području Veluće sprovede- na su magnetometrijska istraživanja ...
... Journal, 1/ 3: 245-257. https://doi.org/10.1002/ gea.3340010302 C u r re n t i n t e rd i s c i p l i n a r y s t u d i e s i n t e c h n o l o g y i n t h e a rc h a e o l o g y o f t h e s o u t h - e a s t E u ro p e ...Dragana Đurić, Jelena Vukčević, Dejan Vučković, Ivana Vasiljević, Vesna Cvetkov . "Terenska nastava iz geofizike: Arheološki lokaliteti na području Trstenika" in Aktuelna interdisciplinarana istraživanja tehnologije u arheologiji jugoistočne Evrope: zbornik radova / Prvi skup Sekcije za arheometriju, arheotehnologiju, geoarheologiju i eksperimentalnu arheologiju Srpskog arheološkog društva, 28.02.2020., Beograd, Beograd : Srpsko arheološko društvo (2020)
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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... X.; Chai, Y.; Zhou, L.; Cao, H.; Cruz, C.; Yang, J.; Dai, J.; Yin, Y.; Yuan, Z.; Zhang, S.; et al. Observation of Magnetoelectric Multiferroicity in a Cubic Perovskite System: LaMnaCraOy. Phys. Rev. Lett. 2015, 115, 87601. [CrossRef] [PubMed] 14. Takahashi, Y.; Shimano, R.; Kaneko, Y.; Murakawa ...
... Was observed at 1300 ?C in all studied cases. Inorganics 2023, 11, 51 3of 19 as-prepared In te ns it y [A rb . un it s] In te ns it y [A rb . un it s] 1300 ·C In te ns it y [A rb . un it s] 10 20 30 40 50 60 70 80 0p i P FI BaTiO_/NiFe,O, BaTiO,/ZnFe,O, BaTiO,/Ni, „Zn ...
... Composites: Applications, Coupling, Mechanisms, and Future Directions. Nanomaterials 2020, 10, 2072. [CrossRet] 8. _ Mao, Q.; Wu, J.; Hu, Z.; Xu, Y.; Du, Y.; Hao, Y.; Guan, M.; Wang, C.; Wang, Z.; Zhou, Z.; et al. Magnetoelectric devices based on magpnetoelectric bulk composites. J. Mater. Chem. C 2021 ...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
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English for Geology Students. 2
Lidija Beko (2023)... Reading Comprehension........... . SLOPE STABILITY ... ttt ttt Mocabulary_ y. NN al . JMN a M, 2MA do a a -yy „O laJaM-Jja Reading Comprehension...........ca. (rammarispo{(-. .J . :yar-Ja%93 270 y Myaı . D . - a ı- eyala y a -yskt ipixercisesL, d. ...... a d W · -kef Ag • ,,, 5v -P ON 2 . a SOMa ...
... .. . MM a o -jyO. 0a -M Reading Comprehension...........i a \rarmmar Spof.. . e a av dMe de e a e de a a la Ioarcik89 olo c o b djo o BRIIO OB .y JD - IIIA K Geological Wonders..........i. a Profession – Young Crystallographer................... Geology Mystery Files ... e Geology through Myths ...
... - W ... .. NEO 125 Reading Comprehension.......... iii 126 Part,2 RBGLAGIERSL. .. a e ddv do M, a . . -M JM 128 'Vocabulary...e.....RM I o N i. y- k 131 Reading Comprehension..........iii .. 133 Part3 MILANKOVITCH CYCLES........ ttt 134 Vocabulary........k.coac a dd0 dd d a d 2 MNMBA o a 138 ...Lidija Beko. English for Geology Students. 2, Belgrade : The Faculty of Mining and Geology, 2023
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Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema
Svetlana M. Štrbac-Savić (2016-06-10)Efikasnost predstavlja preduslov za opstanak svake rudarske kompanije, posebno u uslovima izuzetno konkurentnog trţišnog okruţenja kao što je to rudarska industrija. Efikasnost oznaĉava sposobnost kompanije da ispuni svoje kratkoroĉne ili dugoroĉne ciljeve. Operativna efikasnost se definiše kao odnos izmeĊu ulaznih parametara potrebnih za odvijanje proizvodnje i pokazatelja dobijenih proizvodnjom. U kontekstu rudarskog poslovanja, operativna efikasnost se odnosi na vreme potrebno da se mineralno dobro transformiše u novĉana sredstva. Visoka operativna efikasnost se postiţe kada se ostvari prava kombinacija karakteristika ...podzemni rudnik, operativna efikasnost, prognoza, teorija sivih sistema, stohastiĉke diferencijalne jednaĉine, simulacija... 0 1 0 1 0 1 1 2 0 2 0 2 0 2 1 2 0 0 0 1 2 0 0 0 1 2 ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ s s s T s s s T S T s S s S s S T T y y y y y y E DOL y y y E y E y E y (4.26) Na osnovu jednaĉine (4.26), rukovodstvo ...
... ˆ ˆ 0 y k y k y k k n y y k (4.6) Za k>n moţe se prognozirati DOL: 55 6 6 1 0 1 1 1 1 0 1 1 1 1 1 1 0,1, 2, , 1 1 , ˆ ˆ ˆ ˆ 1, 2, , j ja n h j j j j b b y n h y x n h e x n ...
... 1, 2, 3, 4, 5, 6, 0 1 1 1 , , , , , 0,1, 2, , 1 1 1, 2, , 1, 2, ˆ ˆ ˆ ˆ , ˆ s s s s s n h n h n h n h n h n h s s s y n h y x x x x x x h T y n h y n h y n h h T s S (4.24) gde S oznaĉava broj simulacija. ...Svetlana M. Štrbac-Savić. "Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-06-10)
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Microstructural and magnetic properties of electrospun hematite/cuprospinel composites
Phase composition, microstructural and magnetic properties of electrospun hematite/cuprospinel composites were investigated. Samples were synthesized starting with 0 to 10 mol% of copper relative to iron. The round shape of reference electrospun fbres was preserved upon their heating up to 600 °C in air, whereas at 700 °C hollow substructure was additionally formed. In these reference samples the presence of hematite phase was detected by XRPD. A small amount (traces) of Fe3O4 /γ-Fe2O3 was also found, due to the ...Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics and Optics, Electronic, Optical and Magnetic MaterialsMira Ristić, Aleksandar Kremenović, Michael Reissner, Željka Petrović, Svetozar Musić. "Microstructural and magnetic properties of electrospun hematite/cuprospinel composites" in Journal of Materials Science: Materials in Electronics, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s10854-020-03526-0
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The number of unimodular roots of some reciprocal polynomials
Dragan Stankov (2020)We introduce a sequence P2n of monic reciprocal polynomials with integer coefficients having the central coefficients fixed. We prove that the ratio between number of nonunimodular roots of P2n and its degree d has a limit when d tends to infinity. We present an algorithm for calculation the limit and a numerical method for its approximation. If P2n is the sum of a fixed number of monomials we determine the central coefficients such that the ratio has the minimal limit. ...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. "The number of unimodular roots of some reciprocal polynomials" in Cmptes rendus mathematique (2020). https://doi.org/10.5802/crmath.28
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Uporedna analiza stabilnosti završnih kosina površinskog kopa „Veliki Krivelj“
Mihajlo Topalović (2023)Površinski kop „Veliki Krivelj“ nalazi se u blizina grada Bora i u neposrednoj blizini sela Krivelj. Od 2018. godine je u vlasništvu kineske kompanije „Zijin“ koja ima udeo od 63% vlasništva celokupnog RTB-a Bor. Na površinskom kopu obavlja se masovna eksploatacija rude bakra opremom visokog kapaciteta. Za bušenje se koriste bušilice prečnika od 250 do 310 mm, a za utovar minirane rude i jalovine bageri čija je zapremina kašike 15 m3 i 22 m3. Za površinski kop „Veliki Krivelj“ ...Mihajlo Topalović. Uporedna analiza stabilnosti završnih kosina površinskog kopa „Veliki Krivelj“, 2023
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Geotehnički uslovi rekonstrukcije Zavičajnog muzeja u Jagodini
Milan Tokanović (2024)U radu su prikazana geotehnička istraživanja za potrebe rekonstrukcije Zavičajnog muzeja Jagodina.Zavičajni muzej u ulici Kneginje Milice br.82 u Jagodini, ima ozbiljna oštećenja pojedinih delova konstrukcije koja su nastala na objektu tokom više od 80 godina eksploatacije.Kako bi se trajno rešio problem dinamičke stabilnosti i statičke održivosti konstruktivnog sistema objekta,neophodno je bilo definisanje geotehničkih uslova u zoni interakcije prirodne sredine i konstrukcije predmetnog objekta.Izvedena su terenska i laboratorijska ispitivanja na osnovu kojih su dobijene geotehničke podloge. Na osnovu dobijenih geotehničkih podloga ...geotehnička istraživanja, Zavičajni muzej, temelji, fundiranje, nosivost, sleganje, istražne jame, laboratorijska geomehanička ispitivanja, Jagodina... KaTaory H y myOmMKarjaMa Py/apcko-reoiormikor (paky1rreTra. y Beorpany, __03.07.2024 IIornuc cryneHra Oo0pasau 3 H3JABA O KOPHIITREMbY 3ABPIIHHOT PAJIA OnpnanihyjeM OHOmaoreky Pynapcko-reomomrkor (bakyanrera na y JiararajmH pemo3HTopHjyM yHeCe MOJ 3aBPIHHH P4JI II0J HaCJIOBOM: GEOTEHNIČKI ...
... temelja računa se prema obrascu: (čl. 64.), koji u osnovi ima pojednostavljeno Hansen - ovo rešenje. qa=0.5·y:·B·Ny·Sy·iy+(Cm +qo ·tgqom) ·Nc·Sc·dc·ic+ qo • qQa- dozvoljeno opterećenje tla; • Y- zapreminska težina ispod nivoa temcljnog dna; • B iširina temclja; • NyNc. - faktori nosivosti koji zavise ...
... VREDNOSTI PARAMETARA : Sloj Kohezija c Ugao Zapreminska (kPa) unutrašnjeg težina y trenja q (") (kN/m*) dpr 15.7 26 18.6 DUBINA FUNDIRANJA: Df=0.8m DIMENZIJE TEMELJA: T=A x B = 0.55 x 0.55 m VREDNOSTI PARAMETARA: Y = 18.6 RN/m3 (p = 26?* C=15.7kPa REDUKOVANI PARAMETRI: Cm = ZC_S =t6g.;8 ...Milan Tokanović. Geotehnički uslovi rekonstrukcije Zavičajnog muzeja u Jagodini, 2024
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Properties of fly ash and slag from the power plants
This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method... 2.43 0.23 0.40 0.49 0.74 LOI 1000 – loss on ignition 1000°C; m – �y ash for month May; j – �y ash for month June; (s) – slag; NT – Nikola Tesla; KO – Kostolac Figure 5. The R module according to PP (m – �y ash for month May; j – �y ash for month June; (s) – slag; NT – Nikola Tesla; KO – Kostolac). ...
... 00 – 2.16 – 8.57 m – �y ash for month May; j – �y ash for month June; (s) – slag; w – humidity of the sample; <63μm – fraction of less than 63μm; <2.9 – density of less than 2.9g/cm3; pH – pH values; NT – Nikola Tesla; KO – Kostolac Table 2. Results of chemical analyses of �y and slag taken from the ...
... (s) 56 21 11 3 – – 4 – 5 100 NT B (s) 58 31 5 3 – – 3 – – 100 KO A (s) 63 26 8 – – – – – 3 100 KO B (s) 45 5 25 10 2 – 10 3 – 100 m – �y ash for month May; j – �y ash for month June; (s) – slag; AM – the amorphous material; Q – quartz; f – feldspar; M – mullite; Ml – melilite; An – anhydrite; Cr – ...Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić. "Properties of fly ash and slag from the power plants" in Geologia Croatica, Zagreb : Croatian Geological Survey (2016). https://doi.org/10.4154/gc.2016.26
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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... dldm dnmdmldml nml cs sc z y x T z y x Z Y X T z y x ml Z Y X T z y x TTT xx oxxxxxx xxx xx /0/ //)(/T 0 0 001 T , , )(=d sin=s , cos=c , , 00 0 2 0 2 000 ...
... i momenti u savijenoj ploči Priraštaji sila i momenata glase: . dy y T TT , dx x T TT , dy y M MM , dx x M MM , dy y M MM , dx x M MM yz yz ' yz x xz ' xz yx yx ' yx xy xy ' xy y y ' y x x ' x ...
... pretpostavki teorije tanke ploĉe imamo deformacije z=0, xz=0 i yz=0 i pomeranja w=w(x,y), u=-zy=-z w/x i v=-zx =-zw/y. Nepoznate deformacije glase: . yx w z2 x v y uγ , y w z y vε , x w z x uε 2 xy2 2 y2 2 x ...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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English for Geology Students. 1
Lidija Beko (2023)... - -- -PN.)B /. .|.A O a . - - 31 Reading Comprehension........... a 33 (Gqiranyar P GjeX0)ta dk ooco i obag0od DOb000dobgo y O0000gOoG 34 Exercises XNM . . . MM sg ly- z a y . MM N a D OM o , 36 Geological Wonders ... a 37 Profession – Mineralogist ............ii ... 38 Geology Mystery Files ...
... Comprehension....... ..iiiii i. 79 ROoCK GMOCKS „. a JE--66 J7B -BO OR ZM . .. ML 80 Vocabuulary..0... .0. . MM A yas.K./9. . . JJ .FA M ys wya\viala y a 82 Reading Comprehension.........iiii i. 83 RELATIVE DATING ......... . a ttt 84 \/oeeloyulyo d d0do 0do Poo do oa000.0bDO OOO 0b 0000 88 ...
... . .. NEO 128 Reading Comprehension.......... iii 129 Part 2 |ŽČIGNEOUS ROCKS.... . a v MM . .O . M, 130 'Vocabulary....e.. ...R ... a o . N i a y- k 133 Reading Comprehension..........ii . 134 Part 308 VOLCANOES|.J. „v „Og J JNR 31 . ov eoPeMaMO. • MM cı + - + ) ttake 136 Vocabulary....... ...Lidija Beko. English for Geology Students. 1, Belgrade : The Faculty of Mining and Geology, 2023
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Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji
U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković. "Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji" in XI Međunarodna konferencija ugalj i kritični mineral CCM 2023, Zlatibor, 11-14. oktobar 2023., Beograd : Jugoslovenski komitet za površinsku eksploataciju (2023)