Претрага
925 items
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Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles
Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović (2013)Kinetika i mehanizam reakcija supstitucije između [Ru(trpi)(bpi)Cl]+ sa nukleofilima gvanozin-5′-monofosfatom, L-histidinom, tioureom i dimetilsulfoksidom proučavani su spektrofotometrijski u 0,1 M NaClO4 na 310 K. Red reaktivnosti za odabrane ligande je: tiourea > gvanozin-5′-monofosfat > L-histidin > DMSO. Ovaj red je povezan sa elektronskim, strukturnim i hemijskim karakteristikama kompleksa i nukleofila. Reakcija supstitucije sa tioureom je proučavana na tri različite temperature (288, 298 i 310 K). Negativna entropija aktivacije DS = potvrđuje asocijativni način aktivacije. Formiranje kompleksa [Ru(trpi)(bpi)H2O]2+ sa ligandima ...... potentiometric and spectrophotometric measurements. Complex formation of [Ru(trpy)(bpy)H>O]°* with HL (where HL = 5'-GMP or t-His) The complex formation of [Ru(trpy)(bpy)H,O]?* with ligands 5’-GMP or L-His, symbolized by HL, was studied Table 2 Stability constants of [Ru(trpy)(bpy)H2O] 2?–HL complexes ...
... titration giving [Ru(trpy)(bpy)(HL)]2? (HL = 50-GMP) complex with the maximum in concentration at a pH of about 5. The complex with deprotoneted nucleotide [Ru(trpy)(bpy)(L)]? starts to form at pH 5, and its maximum in concentration is reached at a pH of about 8.5. The pure hydrolytic com- plexes of [ ...
... analogs and their several side effects have stimulated the search for other metal-based anticancer drugs with metal ions differ- ent from platinum [4, 5]. Ruthenium complexes are today the most promising compounds for the investigation of antitumor activity of metal-containing pharmaceuticals [6–10] ...Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović. "Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles" in Monatshefte für Chemie - Chemical Monthly, Springer Science and Business Media LLC (2013). https://doi.org/10.1007/s00706-013-1044-1
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Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines
The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković. "Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines" in 8th International Conference MIining And Environmental Protection, Sokobanja, 22-25 September 2021, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2021)
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Analysis of the exhaust emissions inventory from auxiliary mining machines
Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović (2023)Open-pit coal mines are equipped with a large number of mining machines and vehicles with diesel engines. Due to common daily operation of these machines and vehicles large amounts of exhaust gases which contain numerous pollutants are emitted into the atmosphere. The demand to reduce air pollution induced the activities in developed countries to map and calculate all gases emitted by industries to formulate and select adequate preventive activities. In collaboration with machine manufacturers, emission standards for off-road machines ...Stevan Đenadić, Aleksandar Mirković, Jovana Mitrović, Filip Miletić, Predrag Jovančić, Dragan Ignjatović. "Analysis of the exhaust emissions inventory from auxiliary mining machines" in 9th International Conference Mining and Environmental Protection, University of Belgrade, Faculty of Mining and Geology (2023)
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Supstitucione reakcije Pd(II) kompleksa sa biološki važnim biomolekulima
Aleksandar M. Mijatović, Jovana Bogojeski. "Supstitucione reakcije Pd(II) kompleksa sa biološki važnim biomolekulima" in Hemijski pregled, Srpsko hemijsko društvo (2017)
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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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Indeksi kontrole održavanja i korišćenja rotornog bagera
Razvoj površinske eksploatacije se u velikom stepenu zasniva na svestranoj mehanizaciji rudarskih radova. Kako bi se zadovoljili potrebni kapaciteti, neophodna je primena savremene mehanizacije, velikih kapaciteta i pouzdanosti u radu. Naime, sa stepenom povećanja mehanizovanosti radova smanjuje se broj zaposlenih radnika, povećava produktivnost rada, smanjuju troškovi po jedinici proizvoda, a samim tim i povećava ekonomičnost površinske eksploatacije. Predmet istraživanja su rotorni bageri SRs 1200 koji predstavljaju samohodne mašine kontinuiranog dejstva namenjene za otkopavanje jalovine i korisne supstance na površinskim ...Jovana Mitrović, Predrag Jovančić, Dragan Ignjatović, Stevan Đenadić, Filip Miletić. "Indeksi kontrole održavanja i korišćenja rotornog bagera" in XI Međunarodna konferencija "Ugalj i kritični minerali 2023", CCM 2023, Zlatibor, 11-14. oktobar 2023., Beograd : Jugoslovenski komitet za površinsku eksploataciju (2023)
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Development of integrated fuzzy model for mine management optimization
Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)... the largest “weight" re- Table ı Criteria analysis Crite- KI K2 K3 KA Wc}ght rion coefficients KI 1 1 1 4 5 6 4 5 6,7 Š ,0.375 0.538 | 0.774 K2 |0.17| 0.2 |0.95| 1 1 1 3 4)5)6,0.179 0.275 | 0.415 K3 }0.17} 0.2 } 0.25 | 0.25 | 0.33 | 0.5 1 1 1 |2,3,4,0.085 )0.135|0.212 K4 |0.13|0.14 0 ...
... well as calculated weights. 'The final scores of al] the alternatives, in the form of triangular fuzzy numbers, were calculated under Step 5, based on Eq. 5, and then the final “weights” of the alternatives were derived in the form of non-fuzzy numbers. The optimization indices shown in Table 3 ...
... 372 A2 1 2 1 1 2 3 1 2 3 |0.134|0.324 | 0.677 A3 2 3 1 1 1 3 4 5 |0.212)0.394|0.744 A4 |0.33|0.5 1 0.2 | 0.95/0.3| 1 1 1 |0.062 0.104 | 0.225 Al 1 1 1 |0.33, 0.5 1 |0.25| 0.3 | 0.5} 1 2 3 |0.085|0.165 | 0.332 A2 1 1 1 1 a 4 5 |2 3 4 |0.231,0.435|0.786 A3 2 3 | 4 | 0.2 |0.25|0.33| 1 1 1 2 3 ...Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić. "Development of integrated fuzzy model for mine management optimization" in Comptes rendus de l'Académie Bulgare des Sciences (2023)
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Improving efficiency of thermal power plants through mine coal quality planning and control
Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja. "Improving efficiency of thermal power plants through mine coal quality planning and control" in Thermal Science, Vinča Institute of Nuclear Sciences (2018). https://doi.org/10.2298/TSCI170605209B
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Geotehnički uslovi izgradnje nadvožnjaka "Balajnac" na autoputu E-80 deonica: Niš - Merošina
Dragoslav Rakić, Nikola Božović (2024)U sklopu prve deonice autoputa E-80 Niš – Merošina, izgrađen je nadvožnjak u zoni sela Balajnac koji je oslonjen na tri stubna mesta na međusobnom rastojanju od oko 26 m. Svaki stub je fundiran na šipovima i to sa predloženim rasporedom od 2 šipa u grupi na međusobnom rastojanju od 3.6 m. U radu su na osnovu izvršenih geotehničkih istraživanja terena, analizirani rezultati nosivosti vertikalno opterećenog šipa prečnika 1.2 m i dužine šipa od L = 23 m. Analiza ...Dragoslav Rakić, Nikola Božović. "Geotehnički uslovi izgradnje nadvožnjaka "Balajnac" na autoputu E-80 deonica: Niš - Merošina" in Peti Srpski kongres o putevima, Beograd, 30-31.05.2024., Beograd : Srpsko društvo za puteve "Via Vita" (2024)
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Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)
In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...Pavle Tančić, Aleksandar Kremenović, Predrag Vulić. "Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)" in Powder Diffraction, Cambridge University Press (CUP) (2019). https://doi.org/10.1017/S0885715619000897
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Influence of Initial Treatment on the Survival and Recurrence in Patients With Differentiated Thyroid Microcarcinoma
... 5%. Similarly, Ito et al28 detected 47.9% of lymph node metastases at presentation in contrast to low recurrence rate after a follow-up of 5 and 8 years (2.6% and 5%, respectively). More recently, Hay et al16 also reported higher recurrence rates in node-positive patients (P G 0.001). In agreement with ...
... patients, followed with 131I ablation in 71 (54.6%) of 130 patients. Results: The probability of disease-specific survival was 97.7% T 1.3% after 5 and 10 years; the probability of disease-specific survival was 95.9% T 2.2% after 15, 20, 25, and 28 years after the initial treatment and was significantly ...
... This as- tonishing high increase in incidence is likely due to advances in thyroid diagnostics including ultrasound and fine-needle aspiration biopsy.5 There is, however, also a high prevalence of incidental papillary thyroid microcarcinoma (PTM) in postmortem studies and in pathological resection specimens ...Jasna Mihailović, Ljubomir Stefanović, Ranka Stanković. "Influence of Initial Treatment on the Survival and Recurrence in Patients With Differentiated Thyroid Microcarcinoma" in Clinical Nuclear Medicine, Lippincott Williams & Wilkins (2013). https://doi.org/10.1097/RLU.0b013e3182872ed2
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Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)
Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeLjiljana Vasić, Saša Milanović, Anita Puskás-Preszner, Laszlo Palcsu. "Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-08910-x
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Classification of mining waste landfills according to legislation in Serbia
... sveta [3-5]. Sistemi za klasifikaciju prema CDA i GISTM po- čivaju na istim ili sličnim kategorijama posledica [3, 5]: ljudskim žrtvama, šteti po životnu sredinu, infra- strukturu i ekonomiju, kao i kulturološkoj, sociološkoj šteti i uticaju na ljudsko zdravlje. Obe predlažu ukupno 5 kategorija ...
... slučaju udesa, tzv. „broj ljudi izloženih riziku“ [5]. Dakle, ova klasifikacija ima mailto:dragana.nisic@rgf.bg.ac.rs D. NIŠIĆ i dr. KLASIFIKACIJA DEPONIJA RUDARSKOG OTPADA PREMA… 576 TEHNIKA – RUDARSTVO, GEOLOGIJA I METALURGIJA 72 (2021) 5 jedan kriterijum više od CDA klasifikacije. Sistem ...
... available at: www.dr.rgf.bg.ac.rs D. NIŠIĆ i dr. KLASIFIKACIJA DEPONIJA RUDARSKOG OTPADA PREMA… TEHNIKA – RUDARSTVO, GEOLOGIJA I METALURGIJA 72 (2021) 5 575 Klasifikacija deponija rudarskog otpada prema zakonskoj regulativi u Srbiji DRAGANA D. NIŠIĆ, Univerzitet u Beogradu, Pregledni rad ...Dragana Nišić, Uroš Pantelić, Nikoleta Aleksić, Neda Nišić. "Classification of mining waste landfills according to legislation in Serbia" in Tehnika, Centre for Evaluation in Education and Science (CEON/CEES) (2021). https://doi.org/10.5937/tehnika2105575N
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Генеза хидротермалног Cu-Au система Чукару Пеки (Источна Србија)
Милош Велојић (2021)Главни циљ испитивања хидротермалног система Чукару Пеки је разумевање процеса који су довели до његовог настанка, а посебно еволуције рудоносних флуида из којих је настала рудна минерализација. Утврђено је да је овај систем настао у периоду пре 86,78 - 85,19 Ma из магматског интрузива који је био богат водом и имао висок оксидативни потенцијал. Током хлађења, из овог магматског интрузива су издвојени веома врели флуиди, који су имали температуре изнад 600°С и висок салинитет. У ...Борска металогенетска зона, Тимочки магматски комплекс, порфирска лежишта, високосулфидациона лежишта, флуидне инклузије, рудне парагенезе, геохронологија, хидротермалне алтерације, LA-ICP-MS... 377 69-1 5 -4,4 лед 279 69-2 5 297 69-3 5 298 69-4 5 249 69-5 5 283 69-6 5 299 69-7 5 316 69-8 5 299 69-9 5 248 69-10 5 301 69-11 5 298 69-12 5 255 69-13 5 345 69-14 5 321 69-15 5 225 69-16 5 258 ...
... 258 69-17 5 290 69-18 5 334 69-19 5 302 69-20 5 267 110a 5 -2,3 лед 289 110a 5 -3,5 лед 318 110a 5 -1,7 лед 245 110g-3 5 -2 лед 251 110G-3 5 -0,9 лед 300 110-6 5 -2,9 лед 290 110-7 5 -0,5 лед 329 ГЕНЕЗА ХИДРОТЕРМАЛНОГ Cu-Au СИСТЕМА ЧУКАРУ ПЕКИ (ИСТОЧНА СРБИЈА) ...
... анализе Тип инклузије Tm(°C) Чврста фаза Th (°C) 108-3b 5 -4 лед 323 108-3b 5 330 108-3b 5 372 108-3b 5 396 108-4 5 -0,5 лед 353 108-4 5 294 110G-3 5 277 110G-3 5 286 123-1 5 -2,7 лед 310 123-1 5 356 110-7 6 -3,3 лед 211 116-8 6 237 69-1 ...Милош Велојић. Генеза хидротермалног Cu-Au система Чукару Пеки (Источна Србија), Београд : [М. Велојић], 2021
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Evaluation And Perspectives Of Underground Coal Mines In Serbia
... - Strmosten 3 3 2 3 3 4 4 - Block IV 2 2 2 3 4 4 2 - Senjski rudnik 1 2 2 2 3 4 1 Soko 5 2 1 3 3 4 4 Bogovina 2 3 4 1 2 2 1 Jasenovac 2 2 3 2 3 2 2 Lubnica 4 4 2 3 2 2 2 Štavalj 5 3 3 3 3 1 1 Table 3. Production from PCUCE mines, in period 2010-2015 Year Coal ...
... alternatives is used for every problem [5]. Solving a problem using AHP is carried out using the weights or priorities of the criteria subjected to pairwise comparison (Table 4). Weights or priorities are determined by normalizing the pairwise comparison matrix (Table 5). While performing pairwise c ...
... options available (criteria C6); • Investment potential, possibility to attract an investor (criteria C7). Score for each criterion ranged from 1 to 5 in relation to actual value of parameter or parameters. Due to restricted number of pages, scores of selected criteria required for AHP are given ...Vladimir Milisavljević, Milena Lekić, Ivica Ristović, Vojin Čokorilo, Aleksandar Cvjetić. "Evaluation And Perspectives Of Underground Coal Mines In Serbia" in 7th Balkan Mining Congress Preceedings - BalkanMine2017, Prijedor, 11-13. oktobar 2017., Banjaluka : University of Banjalika, Faculty of Mining, RS, BiH (2017)
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Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector
To strengthen the security of supply of the Serbian gas sector, it is necessary to analyze the impact of planned strategic measures. The analysis involves the identification of the most influential threats to the security of natural gas supply and prioritization of the strategic measures for overcoming the consequences of threats. The proposed methodology is based on Fuzzy Analytic Hierarchy Process. The obtained weights for the identified threats and strategic measures are formed according to experts' judgments. The results ...Sigurnost snabdevanja, Donošenje odluka, Snabdevanje prirodnim gasom, Fazi AHP, Energetski indikatoriBoban Pavlović, Dejan Ivezić, Marija Živković. "Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector" in Energy Policy, Elsevier BV (2020). https://doi.org/10.1016/j.enpol.2020.111936
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From post-disaster landslides inventory to open landslides data
Biljana Abolmasov, Miloš Marjanović, Uroš Đurić, Jelka Krušić. "From post-disaster landslides inventory to open landslides data" in Proceedings of 3rd European Regional Conference of IAEG/ Athens/ Greece/ 6-10 October 2021, International Association for Engineering Geology and the Environment (2021)
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Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)
Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović. "Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)" in Materials, MDPI AG (2024). https://doi.org/10.3390/ma17040820
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The Reciprocal Algebraic Integers Having Small House
Dragan Stankov (2021)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 Reciprocal Algebraic Integers Having Small House" in Experimental Mathematics (2021). https://doi.org/ 10.1080/10586458.2021.1982425
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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