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Упит dcterms_subject_txt:rock mass oscillation equation

334 items

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    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 ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... The benefits of using ultrasonic in rock mass investigations are numerous and become necessary part of testing program more and more. This is especially significantly due to the fact that ultrasonic investigation is the way of testing without fracture of rock samples. Measuring longitudinal ...
    ... , Suzana Lutovac1 Received: May 11, 2018 Accepted: June 15, 2018 Abstract: Almost all of rock masses are more or less anisotropic medium. Foliation, layering, cracking and cleavage are some of the rock attributes that indicate to anisotropy presence. Due to the existence of these discontinuities ...
    ... quantitative indicators of anisotropy; interval numbers 1 INTRODUCTION Anisotropy is the property of rock sample showing different physical characteristics along different directions. Rock masses anisotropy is especially manifested on their following properties: mechanical resistance, elasticity ...

  • 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

  • Trans-Lithospheric Diapirism as a Possible Mechanism for Ophiolite Emplacement?

    Nikola Stanković, Taras Gerya, Vladica Cvetković, Vesna Cvetkov (2024)

  • Age and microfacies of oceanic Upper Triassic radiolarite components from the Middle Jurassic ophiolitic mélange in the Zlatibor Mountains (Inner Dinarides, Serbia) and their provenance

    Hans-Juergen Gawlick, Nevenka Đerić, Sigrid Missoni, Nikita Bragin, Milan Sudar, Divna Jovanović (2017)
    Neo-Tethys, trench-like basins, synorogenic deposition, evolving thrust belt, Triassic palaeogeography
    ... advancing nappes. These deep-water basins were supplied by the erosional pro- ducts of the advancing nappe stack. Several types of mass transport deposits (for a review on Mass Transport Deposits see: Shanmugam 2015) are incorporated in such a turbiditic radiolaritic-argillaceous matrix. Later, these ...
    ... DINARIDES 351 often masked by the younger and polyphase tectonic motions (Schmid et al. 2008). In addition, synorogenic sedimentary basin fills or mass transport deposits in trench-like basins in front of a propagating nappe stack, are commonly overprinted by multiple deformational events or reworked ...
    ... B) a sedimentary mćlange formed in front of the obducted ophiolites in trenches or foredeeps, or C) an original sedimen- tary olistostrome and mass transport dominated deep-water basin fill in front of an advancing nappe stack later incorpo- rated in the nappe stack forming an olistostromal ...

  • Trace elements and garnet formation in a distal skarn zone: a case study of the Rudnik deposit, Central Serbia

    Bojan Kostić, Pavle Tančić, Natalija Batoćanin (2024)
    geohemija granata, retke zemlje, fluidne inkluzije, skarnovsko ležište Rudnik

  • The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>

    Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić (2008)
    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 ...
    Пепсин, алуминијум, кинетика, активација, електрофоретска мобилност
    ... The K, and V x Were determined by their respective regression equations; bkc„ (turnover number) was calculated using the equation kcar —= Vmax/ [E]}., assuming that the molecular mass of the enzyme is 35 kDa. Using UV spectral and aluminium binding assays data (experimental data not shown) the fraction ...
    ... reaction was stopped by addition of 10 mL 5% TCA. The absorbance of clear filtrates' recorded at 28Onm, and activities were calculated by the equation: [42sorFiltrate) — 412go(Blank)} X 1000 10 min X mg enzymcein reaction mixture () U anius, /mg — Estimation of hinetic barameters Kinetic ...

  • Flyrock induced by blasting in surface mining

    Milanka Negovanović, Lazar Kričak, Snežana Ignjatović, Stefan Milanović, Jovan Marković, Nikola Simić, Rade Šarac (2022)
    Miniranje predstavlja i dalje najefikasniji i najjeftiniji način eksploatacije velikih količina čvrstih mineralnih sirovina na površinskim kopovima. Energija eksplozije se koristi za fragmentaciju čvrste stenske mase do zahtevane granulacije. Pored pozitivnih efekata miniranja, postoje i određeni neželjeni efekti svakog procesa miniranja koji se mogu javiti, a to su: potresi tla, razletanje komada stene, vazdušni udari, otrovni i zagušljivi gasovi i prašina. Razletanje komada stene je nekontrolisano izbacivanje fragmenata odminirane stenske mase i predstavlja jedan od glavnih izvora materijalne štete ...
    razletanje, bušenje, miniranje, površinska eksploatacija, bezbednost, nesreća

  • Merenje mase iskopanog uglja na površinskim kopovima

    Snežana Aleksandrović (2015)

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... Coal mass, total 400,000 t 375,000 t Coal mass per package 100,000 t 65,000 t Reserve 8 days 7.5 days Time per package 6 shifts 4 shifts Max. number of filled packages 2.5 4.5 Min. number of filled packages 1.5 1.5 Max. coal mass at coal yard 250,000 t 270,000 t Min coal mass at coal ...
    ... sizes to be equal, the stacker has to change travel speed depending on the quantity of coal arriving at the stockyard. The regulation unit applied is mass per minute. Thus the stacking speed for the selected method depends on the number of layers, the stacking capacity and the constructional capabilities ...

  • Failure Estimation of the Majdanpek Open Pit East Face Based on Inverse Velocity Model

    Miloš Marjanović, Stefan Milanović, Nikola Simić, Lazar Kričak (2024)
    The Majdanpek open pit mine south district is currently active mining prospect of copper ore exploitation in eastern Serbia. Its depth is approaching the termination depth and occurrences of large-scale instabilities and global instability of the final pit slope is possible. These can generate catastrophic mass movement inside an area that encloses a regional road route and the Pek River bed which is channelled along the outer contour of the pit. The displacements that were noted in early 2023, in the ...
    displacement, survey, inverse velocity, open pit

  • Maturation and isotopic changes of individual hydrocarbons in lignite lithotypes through diagenesis and early catagenesis

    Ivan Kojić, Achim Bechtel, Reinhard Sachsenhofer, Dragana Životić, Ksenija Stojanović (2019)
    ... analysis which inđicate that the first significant mass 1055 (after releasing ог moisture) occurs between 400 "С and 500 %C. Aliphatic апд aromatic fractions isolated from lignite extracts and hquid pyrolysis prođucts were analyzed by gas chromatography-mass spectrometry. Carbon isotope determinations (65С) ...

  • Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia

    Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin (2013)

  • 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
    ... and in comparison, to BaTiOyx /NiFe>»Ou and BaTiOa / ZnFe>»Ox, mass magnetization enhancement can be explained by the most significant grain size incre- ment as the sintering, temperature increased, Figure 4 and Table 2. The change in mass magnetization value in the temperature range from 20 ?C to ...
    ... Fe)pOa sin- tered at 1150 ?"C, there was a sharp fall in mass magnetization due to the phase transition caused by partial destruction of the domain structure within the crystallites from 340 *C to 400 ?C, followed by a gentle fall in mass magnetization up to 480 ?C. Then, the biggest fall due to ...
    ... BaTiOys /NiFe>»Ou, BaTiOys /ZnFe>Ou, and BaTiOy / Nip s Zno ,s Fe)Oa samples (Ba-cyan; Zn-yellow; Ni-orange; Fe-magjenta; Ti-blue; O-green). Table 2. Mass magnetization values of sintered samples at room temperature. Sample M [emu/g] BaTiOys //NiFe>»Ou 1150 *C 12.46 BaTiOa/ZnFe>Oa 1150 ?C 1.74 BaTiOy ...

  • Димензионисање транспортера на спољашњем одлагалишту повшинског копа Западни Костолац

    Петар Миловановић (2024)
    У савременом рударству, површински копови угља наилазе на различите проблеме које треба превазићи зарад добијања потребне количине угља. Као највећи потрошачи овог енергента су термоелектране, на основу овога можемо да закључимо колико су блиско повезани добра и континуирана производња на површинском копу и рад термоелектрана. Са задатком да се обезбеди стабилна и континуирана производња, потребно је да се направи добар одабир транспортера. У овом раду, за димензионисање потребног транспортера са траком, коришћен је програмски пакет Helix.Програмски пакет Helix представља један ...
    транспортна трака, снага погона, затезна чврстоћа, угаљ, Западни Костолац, Helix
    ... Density 0.369 m2 Belt and Material Mass Belt Actual % Full at High BD 83.8 % Belt Top Cover Mass 35.8 ko/m Flooded Belt Capacity at 1700kgim3 Belt Bottom Cover Mass 17.9 kg/m Flooded Belt Load Area at Zero Belt Carcass Mass 21.4 kg/m Edge Distance 0.5941 m2 Belt Mass Wb (per linear m) 82.5 ko/m Flooded ...
    ... Flooded Belt Capacity 16821 tonnes/hr Material Mass Wm 627.2 kg/m Flooded Belt Material Mass 1004.8 kg/m Total Mass (Wb + Wm) 709.7 kg/m Total Belt Mass (Wb x L) 297380 kg Designers Comments {eif\anahdefiO\aftang1033(Voribi(VOViswias MS Sans Serit:} \Viewkind4\uc1\pard\0\fs16 \par} EaciavaiZav ...
    ... Run Safety Factor ST 2000 7.95 Top Cover Thickness 16 mm Belt Rated Tension 300 kN/m Bottom Cover Thickness 8 mm Belt Total Length 3604.6 m Belt Mass 82.50 kg/m Belt Tensions and Power Calculations . ISO Effective Tens. Fully Loaded 381.97 kN Belt Power - Empty Belt 311.67 kW Maximum Tension ...

  • Dynamic and Static Elastic Properties - Laboratory Investigations of Metamorphites of the "Vranjska Banja" Series

    Jelena Majstorović, Bojan Dimitrijević, Suzana Lutovac, Snežana Savković, Miloš Gligorić (2021)
    Metamorphites of the series “Vranjska banja” built predominantly of high crystallinity schist series, alternately layered double mica, gneiss, leptonite and micaschist. For the construction of the “Prvonek” dam were carried out laboratory investigations of dynamic and static elastic properties on micashist and gneiss samples in the perpendicular and parallel direction to the foliation. These investigations provided monitoring of the rock mass anisotropy properties and greater reliability of the design parameteres. As the design of mining and construction facilities becomes ...
    micashist, gneiss, foliation, dynamic properties, static properties

  • Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach

    Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)
    Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...
    pyrazoloquinolinones, nanocrystals, wet media milling, fasted/fed bioavailability
    ... of DK-I-60-3 in all experiments, the liquid chromatography- tandem mass spectrometry (LC-MS/MS) method was used on the UHPLC chromatograph ACELLA (Thermo Fisher Scientific Inc., Madison, WI, USA), coupled to a triple quadrupole mass spectrometer TSQ Quantum Access MAX (Thermo Fisher Scientific Inc., ...
    ... noted that the differences between the nanocrystals formulations and suspensions were not as pronounced as expected according to the Noyes–Whitney equation. The reason for the obtained results could be found in dialysis membrane acting as a permeation barrier or very low solubility in the dissolution ...
    ... results were published for nanosuspensions of cefdinir [29]. An increase in saturation solubility is expected according to the Ostwald–Freundlich equation [30], due to reduced particle size but also as a consequence of changes in crystal lattice energy [29]. In the other two media, however, the solubility ...

  • Верификација етажних транспортера на угљеном систему – површински коп Дрмно

    Тамара Андрејевић (2024)
    У савременом рударству, површински копови угља наилазе на различите проблеме које треба превазићи зарад добијања потребне количине угља. Као највећи потрошачи овог енергента јављају се термоелектране, где на основу овога можемо да закључимо колико су блиско повезани добра и континуирана производња на површинском копу и рад термоелектрана. Са циљем да се обезбеди стабилна и континуирана производња, потребно је да се направи добар одабир транспортера. У овом раду, за потребе верификације затезне чврстоће траке и снаге погона транспортера, коришћен је ...
    транспортна трака, снага погона, затезна чврстоћа, угаљ, Дрмно, Helix
    ... 0.1987. m2 Belt and Material Mass Belt Actual % Full at High BD 53.3 % Belt Top Cover Mass 35.8 kg/m Flooded Belt Capacity at 960kg/m3 Belt Bottom Cover Mass 17.9 kg/m Flooded Belt Load Area at Zero Belt Carcass Mass 19.3. kg/m Edge Distance 0.4942 m2 Belt Mass Wb (per linear m) 82 kg/m Flooded ...
    ... Flooded Belt Capacity 8881 tonnes/hr Material Mass Wm 190.7 kg/m Flooded Belt Material Mass 474.4 kg/m Total Mass (Wb + Wm) 272.7 kg/m Total Belt Mass (Wb x L) 266443 kg Designers Comments {\rtfi\ansi\deff0\deflang1033{\fonttbn{\f0\fswiss MS Sans Serif;}} \viewkind4\uc1\pard\f0\fs16 \par} E ...
    ... Strength % Used (Running) ıi. I —s o 10 20 3a 4 e -j 7 LJ Bel Tensions & Takeup Mass Bffective Tension 21753 kN Ficton Adjustment Factor: Maximum Tension (Run) 37096 kN 1 Minimum Tension (Run) 14220 kN Takeup Mass 32270 kg Calculated & installed Power instaled Power 2,520.00 kW. Absorbed ...

  • Application of softwares for drilling and blasting

    Stefan Milanović, Lazar Kričak, Milanka Negovanović, Nikola Simić, Jovan Marković (2019)
    U današnje vreme softveri se sve više primenjuju u rudarstvu kroz eksploataciju mineralnih sirovina, projektovanje rudnika, u obavljanju različitih operacija na terenu i sl. Među softverima za rudarstvo, postoje softveri za specifične rudarske operacije, kao što su operacije bušenja i miniranja. Ovi procesi su veoma važni u eksploataciji čvrstih mineralnih sirovina, jer predstavljaju najjeftiniji i najefikasniji oblik fragmentacije stenske mase. Kroz rad, predstavljeni su neki od softvera u kombinaciji sa modernim tehnologijama, koje se koriste širom sveta i koje ...
    softver, moderne tehnologije, miniranje, bušenje, minsko polje