Претрага
858 items
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Rezultati probnog ispitivanja geotehničkih prenapregnutih sidara u Užicu (Stari grad)
Vladimir Kovačević (2024)Za potrebe izrade završnog rada na četvrtoj godini Rudarsko-geološkog fakulteta, studijskog programa Geotehnika, pod mentorstvom doc. dr Zorana Berisavljevića, odabrana je tema „Rezultati probnog ispitivanja geotehničkih prenapregnutih sidara u Užicu (Stari grad)“. Osnovni metodološki pristup koji je korišćen za rešavanje postavljenog problema predstavlja kabinetsko istraživanje dostupne dokumentacije, analiza i interpretacija rezultata izvedenih geoloških,geotehničkih i geomehaničkih istraživanja. Predstavljene su osnovne informacije,karakteristike i upotreba prednapregnutih geotehničkih sidara.Analiziran je tok testiranja granične nosivosti prednapregnutih sidara. Na osnovu izvršenih geotehničkih istraživanja terena i ispitivanja ...... nosivosti geotehničkog sidra br. 1 Na osnovu prihvaćene metodologije testiranja nosivosti geotehničkih sidara koje su zasnovane na preporukama standarda SIA V 191, Aneks 2, izvedeni su sledeći zaključci za ispitivano sidro broj 1. • Na l nivou opterećenja (P=641 kN) kriterijumi puzanja nisu zadovoljeni ...
... nosivosti geotehničkog sidra br. 2 Na osnovu prihvaćene metodologije testiranja nosivosti geotehničkih sidara koje su zasnovane na preporukama standarda SIA V 191, Aneks 2, izvedeni su sledeći zaključci za ispitivano sidro broj 2. • Kriterijumi nosivosti i puzanja su zadovoljeni na svim predviđenim ...
... :; - SIAV191 PREDLOG PROGRAMA ZA TESTIRANJE NOSIVOSTI SIDARA Predlog programa za testiranje nosivosti sidara se vrši na osnovu preporuka standarda SIA V 191 i to na taj način da se za svako sidro izvede jedan od sledećih testova nosivosti ankera: - test granične nosivosti (radi se na probnim sidrima ...Vladimir Kovačević. Rezultati probnog ispitivanja geotehničkih prenapregnutih sidara u Užicu (Stari grad), 2024
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Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria
The choice of adequate mining machines is one of the most complex problems in the underground exploitation of mineral raw materials. The weight of such a decision is reflected in the high prices of these machines and the occurrence of even greater costs during their use if their choice was wrongly conceived. There are numerous examples from practice in which such decisions were made solely on the basis of comparing the prices of machines, without considering any of the ...utovarno-transportna mehanizacija, izbor, TOPSIS, entropija, standardna devijacija, težina kriterijumaVladimir Krivošić, Luka Crnogorac, Rade Tokalić. "Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria" in Underground mining engineering, University of Belgrade - Faculty of Mining and Geology (2024)
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О сопротивлении угля при резании в условиях подводной добычи
Gojković Nebojša, Čebašek Vladimir, Слободан Вуйич, Miljanović Igor, Александар Петровски, Milutinović Aleksandar (2011)Gojković Nebojša, Čebašek Vladimir, Слободан Вуйич, Miljanović Igor, Александар Петровски, Milutinović Aleksandar. "О сопротивлении угля при резании в условиях подводной добычи" in Всероссийская научная конференция „Геодинамика и напряженное состояние недр земли“, посвящена 80-летию академика М. В. Курлени, 3-6.10.2011 - no. -, Новосибирск, Россия:Институт горного дела Новосибирского научного центра Сибирского отделения Российской академии наук, Новосибирск (2011): 191-195. https://doi.org/-
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Rešenje sistema za navodnjavanje spoljašnjeg odlagališta površinskog kopa Drmno
Milanović Radomir, Vuković Zoran, Dimitrijević Bojan, Pavlović Milan. "Rešenje sistema za navodnjavanje spoljašnjeg odlagališta površinskog kopa Drmno" in Zbornik radova 5. Međunarodna konferencija UGALj 2011 no. V, Zlatibor, Srbija:Jugoslovenski Komitet za površinsku eksploataciju Saveza inženjera rudarstva i geologije Srbije (2011): 191-198
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Одређивање оптималне производње дубинске пумпе на клипним шипкама
Небојша Савић (2024)Дужи временски период током историје производње нафте, дубинске пумпе на клипним шипкама су први и у многим случајевима једини избор када су у питању механичке методе експлоатације. Правилан одабир сваког појединачног елемента система омогућава оптимизацију која са собом повлачи бенефите у виду повећавања ефикасности и смањења трошкова. Тренутно примењени систем дубинских пумпи на клипним шипкама на лежишту „Н“ обезбеђује стабилну производњу и реализацију годишњих планова производње без већих проблема. У овом раду је приказан начин оптимизације производње дубинским пумпама ...... string stress analysis (service factor: 0.9) Diameter (mm) | __RodGrado # Guides/Rod 222 TEND Alov o >»>22 TEND Alov 3 191 TEND Allv 3 191 TEN D Alov o 191 TEND Allov 3 191 TEND Alov o NOTE Daplaved bottorm riryrncen str#33 c alcula6Ora dO no4 \rchude buovancy altects {(top muvnorn ard m 3tre3363 ...
... 182752 98253 67453 [] »? TEN D Allev 283 | 827371 | 04 | 513% 143786 64591 50151 3 191 TEN D Allev 512 | #&27371 | 04 | 635% 162739 64977 31559 3 191 TEND Allev 256 | 827371 | 02 | 491% 108829 24250 13703 [] 191 TEN D Allov' 229 | 827371 | 04 | 439%% 85630 4964 -1274 H 11 TEN D Allev 134 | 827371 ...
... TEND Allov 6M4 | 827371 | O2 | 587% 180155 90874 56631 o 91 TEND Allov 140 | 827371 | O2 | 595%% 163018 74053 68323 o 191 TEN D Allov, ” 827371 04 55% 149741 63622 63884 3 191 TEN D Allov 4433| 8#2737% | O2 | 52%%, 141273 58881 3121 o NOTE Daplaved boom munenum ste535 cakućabors do r \rclude buovancy ...Небојша Савић. Одређивање оптималне производње дубинске пумпе на клипним шипкама, 2024
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The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments
Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...... (H)21β(H)-hopane; oleanane, gammacerane, tricyclic terpanes and pentacyclic terpanes (hopanes) were quantified from the mass chromatogram m/z 191 TABLE V. Maturity parameters calculated from the distributions and abundances of pen- tacyclic terpanes Sample C31αβ(S)/C31αβ(S+R)a C30βα/C30αβb C29Ts/C29αβc ...
... 2665–2675 m) and Elemir (well 19; depth interval 1640–1644 m) oil fields (Figs. 3–8; Tables IV and V), which are located close to the investigated area Fig. 5. GC–MS chromatograms of terpanes m/z 191 of the saturated fraction isolated from Rusanda crude oils. For peak assignments, see the legend ...
... min. Detailed analyses of the target compounds were conducted using the following ion chromatograms: m/z = 71 (n-alka- nes and isoprenoids), m/z = 191 (terpanes) and m/z = 217 (steranes). The individual peaks were identified by comparison with literature data12 and based on the total mass spectra ...Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević. "The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments" in Journal of Serbian Chemical Society, Beograd : Srpsko hemijsko društvo (2013). https://doi.org/10.2298/JSC130614087S
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Principi izbora racionalnih karakteristika izvoznih tornjeva u zavisnosti od kapaciteta izvoza i vrste rudničkih proizvoda, a prema postojećim Jugoslovenskim standardima
Duši Minir (1965)Duši Minir. Principi izbora racionalnih karakteristika izvoznih tornjeva u zavisnosti od kapaciteta izvoza i vrste rudničkih proizvoda, a prema postojećim Jugoslovenskim standardima, Beograd:Rudarsko Geološki Fakultet, 1965
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Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia
Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeFen Huang, Ljiljana Vasic, Xia Wu, Jianhua Cao, Saša Milanovic. "Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia" in Environmental Earth Sciences, Springer Science and Business Media LLC (2019). https://doi.org/10.1007/s12665-019-8452-4
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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 ...... 386 + 10 3938 + 102 4318 + 154 1.7-:10 + 0.918 + 0.073 430 + 13 4470 + 132 4870 + 191 1.7-10 2 0.921 + 0.074 407 + 14 5071 + 143 5506 + 209 8.x7-10 2 0.917 + 0.073 509 + 17 6112 + 173 6665 + 254 P The K, and V x Were determined by their respective regression equations; bkc„ (turnover number) was ...
... Recently it has been shown that Al'* ions inhibited trypsin activity, but do not pepsin. It was observed highest activation of pepsin activity by 191% in the presence of 25 ag AP?/ mL of reaction mixture [25]. As the mechanism of Al'* ions on pepsin activity is not still clear, the objective ...
... effect of AP? Yijons on porcine pepsin activity. 'The authors reported that applying concentration of 1.1-10 ~M Al ions induce the activation of 191%, while we obtained 135.8% activation of pepsin activity, in applied concentration of AI? ions of 8.7-10 ~M. The observed disagreements could be ...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
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An Italian-Serbian Sentence Aligned Parallel Literary Corpus
This article presents the construction and relevance of an Italian-Serbian sentence-aligned parallel corpus, delving into the aligned sentences in order to facilitate effective translation between the two languages. The parallel corpus serves as a valuable resource for language experts, researchers, and language enthusiasts, fostering a deeper understanding of linguistic nuances and cultural expressions. By bridging the gap between Serbian and Italian, this corpus opens new avenues for cross-cultural communication and collaboration, and ultimately contributes to the improvement of language-related ...Saša Moderc, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić. "An Italian-Serbian Sentence Aligned Parallel Literary Corpus" in Review of the National Center for Digitization, Belgrade : Faculty of Mathematics, University of Belgrade (2023). https://doi.org/10.5281/zenodo.11203388
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Компарација метода XRF i ICP-MS на узорцима угља и продуктима сагоревања
Бранко Костић, Ксенија Ераковић, Дејан Прелевић, Сабина Ковач, Драгана Животић. "Компарација метода XRF i ICP-MS на узорцима угља и продуктима сагоревања" in Записници Српског геолошког друштва (2023)
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Eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje
U radu su analizirani eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje. Period analize je prvih šest meseci tekuće godine. Analiza je vršena sa aspekta ostvarene proizvodnje, kvaliteta uglja, efektivnog vremena rada, kapacitetnog i vremenskog iskoršćenja i zastoja sistema. Za poređenje podataka različitih parametara koji po svojoj prirodi nisu međusobno uporedivi, u radu su korišćene metode višekriterijumskog odlučivanja.... Sistem Sj Rj I BTD 0,31 0,00 II BTD 0,00 1,00 III BTD 1,00 1,00 IV BTD 0,49 0,00 Tabela 4.2 Vrednosti Qj za v = 0,5; 0,6 i 0,7 Sistem v = 0,5 v = 0,6 v = 0,7 Qj Rang Qj Rang Qj Rang I BTD 0,153015 1 0,183619 1 0,214222 1 II BTD 0,5 3 0,4 3 0,3 2 III BTD ...
... L., & Yoon, K. (1981). Methods for multiple attribute decision making. In Multiple attribute decision making. Springer, Berlin, Heidelberg, pp. 58-191; [7] Sitorus, F., Cilliers, Jan J., Pablo, R., & Brito-Parada, R. (2019). Multi-criteria decision making for the choice problem in mining and mineral ...
... tri različite vrednosti stope, v = 0,5; 0,6 i 0,7. Glavni rang je rezultat kompomisa rang lista alternativa i kompromisnog rešenja sa određenom stopom. Vrednosti Sj i Rj prikazani su u tabeli 4.1 dok su za vrednosti Qj dobijene tri rang liste, za različite vrednosti stope v = 0,5; 0,6 i 0,7 i date su u ...Marko Lazić, Filip Miletić, Milena Lekić, Veljko Rupar, Željko Petrović, Lazar Žujović . "Eksploatacioni učinci ugljenih sistema na površinskom kopu Tamnava–Zapadno polje" in 10th International Conference Coal 2021, Jugoslovenski komitet za površinsku eksploataciju, Zlatibor (2021)
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Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia
This paper presents LA-ICP-MS data for garnets from the Rudnik skarn deposit (Serbia), which range from Grs45–58Adr40–52Alm2–3 in the core and Adr70–97Grs2–29Sps1 in the rim displaying anisotropy and zoning. In spite of wide compositional variations the garnets near the end-member of andradite (Adr > 90) are generally isotropic. Fe-rich rims exhibit LREE depletion and flat HREE pattern with weak negative Eu anomaly, including higher As and W contents. On the other side, the Fe-poorer core shows flat REE pattern ...... were calibrated with GJ1 zircon standard (Jackson et al. 2004) as external standard for fractionation correction, and 91500 standard zircons (Wiedenbeck et al. 1995) were used as unknown to correct systematic error. Reference material NIST610 was used as standard material for trace elements. Data ...
... Constraints from observational data. In: Gee D.G. & Stephenson R.A. (Eds.): European Lithosphere Dynamics. Geological Society, London, Memoirs 32, 191–206. Jackson S.E., Pearson N.J., Griffin W.L. & Belousova E.A. 2004: The application of laser ablation-inductively coupled plasma-mass spectrometry ...
... Wu S. 2014: Origin of oscillatory zoned garnets from the Xieertala Fe–Zn skarn deposit, northern China: In situ LA–ICP-MS evidence. Lithos 190–191, 279–291. https://doi.org/10.1016/j.lithos.2013.12.017 ...Bojan Kostić, Danica Srećković-Batoćanin, Petyo Filipov, Pavle Tančić, Kristijan Sokol. "Anisotropic grossular–andradite garnets: Evidence of two stage skarn evolution from Rudnik, Central Serbia" in Geologica Carpathica, Central Library of the Slovak Academy of Sciences (2021). https://doi.org/10.31577/GeolCarp.72.1.2
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Overview of brown coal reserves in Banovići basin in accordance with PERC reporting standard
Damir Baraković, Kasim Modrić, Vladimir Simić. "Overview of brown coal reserves in Banovići basin in accordance with PERC reporting standard" in Tehnika, Centre for Evaluation in Education and Science (CEON/CEES) (2021). https://doi.org/10.5937/tehnika2102157B
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Geotehnički aspekti izgradnje visećeg pešačkog mosta u Starom gradu u Užicu
U radu su prikazani rezultati geotehničkih istraživanja za potrebe izgradnje visećeg pešačkog mosta preko klisure reke Đetinje u Užicu. Predviđeno je da most, sistema prednapregnute trake, omogući prelaz pešacima sa desne dolinske strane na stranu Starog grada, koja je opasana strmom liticom (cca. 40 m visine). Za potrebe formiranja geotehničkog modela i strukturnog sklopa krečnjačke stenske mase korišćen je postupak fotogrametrijskog snimanja dronom. Predviđeno je da se zatežuća sila (od oko 30 MN), koju most prenosi na obalni stub, ...fotogrametrija, stabilnost kosina, pukotine, prednapregnuta sidra, test granične nosivosti, paker (Ližonov) test... izveštaj o dokazu kvaliteta) i metodologiju ispitivanja ankera, pri čemu je i izvršio kontrolna ispitivanja (test granične nosivosti) ankera (prema SIA normama). Kao maksimalna sila testiranja usvojena je vrednost od P=2678 kN. Ispitivanje je vršeno u osam prirasta od po AP=291 kN (641, 932, 1223 ...
... kriterijuma loma, za koji su podaci dobijeni prema proceduri opisanoj u poglavlju 2.1. Veličine rezidualnog ugla trenja (0y) i Poisson-ovog, koeficijenta (v) su procenjene na osnovu literaturnih podataka. 121 Napominjemo da je zbog potrebe za procenom nosivosti na kontaktu stenska masa – injekciona ...Zoran Berisavljević, Miloš Marjanović, Uroš Đurić. "Geotehnički aspekti izgradnje visećeg pešačkog mosta u Starom gradu u Užicu" in Zbornik radova / Međunarodno naučno-stručno savetovanje Geotehnički aspekti građevinarstva i zemljotresno inženjerstvo, Vrnjačka banja, 1-3. novembar 2023., Beograd : Savez građevinskih inženjera Srbije (2023.)
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Effectiveness Analysis of Different Bucket-wheel Excavators
Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić. "Effectiveness Analysis of Different Bucket-wheel Excavators" in 8th International Conference Mining and Environmental Protection, Sokobanja, 22-25 September 2021, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2021)
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A necessary and sufficient condition for an algebraic integer to be a Salem number
Dragan Stankov (2019)We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.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. "A necessary and sufficient condition for an algebraic integer to be a Salem number" in Journal de theorie des nombres de Bordeaux (2019). https://doi.org/10.5802/jtnb.1076
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Geologija i geneza crvenih boksita Crne Gore
Marko Pajović (1996)Marko Pajović. Geologija i geneza crvenih boksita Crne Gore, Beograd:Rudarsko Geološki Fakultet, 1996
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Tehnologija izrade jamskog magacina eksploziva i eksplozivnih sredstava
Sara Nikolić (2024)Završni rad sa temom „Tehnologija izrade jamskog magacina eksploziva i eksplozivnih sredstava” sastoji je iz opšteg dela i specijalnog dela. U opštem delu prikazani su : geologija ležišta, određivanje kapaciteta magacina eksplozivnih sredstava, lokacija i opis magacina. U specijalnom – drugom delu ovog završnog rada prikazani su: potrebni proračuni, tehnologija izrade magacina, predmer i predračun radova, normativi materijala, energije i radne snage, organizacija i dinamika izvodjenja radova. Prilikom izrade završnog rada, uz primenu svih propisa vezanih za ovu oblast, korišćene su ...... treba da iznosi v=0,15m/s i ta brzina obezbeđuje turbulentno kretanje. Prema tome potrebna količina vazduha iZnOSI; V=S-·v, m3/s (6.28) V=4.7·0.15=0.7 m3/s =42 m3/min gde jJe: V – količina vazduha, m*/s, m*/min, S – svetla površina pop. preseka prostorije (4.7+5.15 m?), m?, v — brzina vazdušne ...
... od betona MB- 30 celom svojom dužinom, pa su mu iskopne dimenzije poprečnog preseka bxh=2,40x2,70(m), te mu je iskopna površina poprečnog preseka Sia=6,37m?. Po potrebi, betonsku podgradu armirati odgovarajućom armaturom. Pošto će sec transport ES kroz hodnike magacina vršiti kolicima ili "japanerom" ...
... materijala: V=Si · h =4,90-1,4=6,86m3 (6.7) Usvojeno V=7,0m3, Qma=V •y= 7,0 · 2,52=17,64t (6.8) gde je: y=2,52t/m? – zapreminska masa materijala – krečnjaka. Usvaja se količina odminiranog materijala Qma=18,00t. Zapremina odminiranog materijala u rastresitom stanju iznosi: Vi= V · kr = 7,0 ...Sara Nikolić. Tehnologija izrade jamskog magacina eksploziva i eksplozivnih sredstava, 2024
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Paleontološke karakteristike i biostratigrafski značaj rudistnog senonskog roda pseudopolyconites Milovanović
Mileva Sladić-Trifunović (1980)Mileva Sladić-Trifunović. Paleontološke karakteristike i biostratigrafski značaj rudistnog senonskog roda pseudopolyconites Milovanović, Beograd:Rudarsko Geološki Fakultet, 1980