Претрага

Упит dcterms_subject_txt:geological range

334 items

  • Investigation of nanostructured Ca0.9Er0.1MnO3 obtained by sucrose nitrate procedure

    Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)
    ... ratios, in order to obtain a perovskite with a crystalline structure. The resulting: CapEro,, MnOxy is calcined for 15 minutes in the temperature range from 800% to 1000%. Diffraction thermal analysis (DTA), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), scanning ...

  • Development of a petrographic classification system for organic particles affected by self-heating in coal waste. (An ICCP Classification System, Self-heating Working Group – Commission III)

    M. Misz-Kennan, J. Kus, D. Flores, C. Avila, Z. Büçkün, N. Choudhury, K. Christanis, J.P. Joubert, S. Kalaitzidis, A.I. Karayigit, M. Malecha, M. Marques, P. Martizzi, J.M.K. O'Keefe, W. Pickel, G. Predeanu, S. Pusz, J. Ribeiro, S. Rodrigues, A.K. Singh, I. Suárez-Ruiz, I. Sýkorová, N.J. Wagner, D. Životić (2020)
    Self-heating of coal waste is a major problem in the leading coal-producing and consuming countries, independent of the recent or past coal exploitation history. The phenomenon of self-heating is dependent on many factors such as the properties of organic matter (maceral composition and rank), moisture and pyrite content, climate effects, and storage conditions (shape of the dump or compaction of the coal waste). Once deposited, coal waste undergoes oxidation, which can lead to self- heating with the overall temperatures ...
    Stratigraphy,Economic Geology,Geology,Fuel Technology

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... Test results of the UCS are shown in Table 1. The UCS values σci UCS for dacite samples range from 100.74 to 106.77 MPa, with a mean value of 103.72 MPa. For the altered dacite samples, the values of UCS range from 32.70 to 34.85 MPa, with a mean value of 33.90 MPa. For composite samples, the minimum ...
    ... masses. Bull. Geol. Soc. Greece 2017, 43, 1248. [CrossRef] 11. Lazarev, S.; Ječmenica, J. Final Report on the Results of Geological Research on the Project of Applied Geological Research of Dacite as Technical-Building Stone in the Deposit ‘Ćeramide’ near Rudnik in the Exploitation Field; Technical ...
    ... research, the values of confining pressures (σ3) were defined according to the recommendations given by Hoek and Brown [20], where the values for the range of confining pressure are 0< σ3 < 0.5σci. During the test, the specimen first led to the hydrostatic stress state, i.e., with the increase in the confining ...

  • Development of an integrated model for open-pit-mine discontinuous haulage system optimization

    Miodrag Čelebić, Dragoljub Bajić, Sanja Bajić, Mirjana Banković, Duško Torbica, Aleksej Milošević , Dejan Stevanović (2024)
    equipment selection, mine mechanization, expert judgment, linguistic variables, MCDM, FAHP

  • Advantages and Disadvantages of a Parallel and Zigzag Method of Acquisition in Walking Mode in Magnetometric Archeological Research

    Mirko Petković, Vesna Cvetkov, Branislav Sretenović (2014)
    магнетометријска испитивања, цик-цак и паралелна аквизиција у ходајућем моду, линеарне аномалије, археологија
    ... three cases, the data which had been acquired outside of the polygons was clipped from the da- tabase, and also the data whose value was outside a range of ± 70 nT/m. The data was arranged in a regular grid using Kriging’s interpolation method (Isaaks and Srivastava 1989) and presented as a map of ...
    ... fourth, fi fth and sixth) in the fi rst step of processing, data outside the test polygon was clipped along with data whose gra- dient fell outside a range of ± 70 nT/m. The data was gridded using the same interpolation method and displayed as a map of the vertical gradient of TMI (Figure 5.). Figure ...
    ... spatially limited, was omitted. In the fi rst step of processing, the peaks were clipped, i.e., where the gradient value of the TMI was outside the range of ± 70 nT/m, after which it was interpolated using the Kriging method (Fig- ure 7.a.). Figure 7 Although it was measured in the same poly- gon, ...

  • Geotechnical Conditions for Construction of Savski Trg Metro Station as a Part of the Belgrade Metro Line One

    Nemanja Stanic, Dragoslav Rakic, Josip Isek, Slavoljub Simic (2024)
    In order to solve serious traffic congestion in Belgrade, a number of studies regarding the Belgrade Metro construction have been carried out since 1973. However, only in 2019, the routes of the future metro lines 1 and 2 were de-fined as a part of the General Metro Construction Project. The lines are de-signed to intersect at the location of Sava Square, where an interchange met-ro station will be built. It represents a complex geotechnical structure consist-ing of three different ...
    metro station, geotechnical modelling, displacements

  • Results of comprehensive monitoring activities on Umka landslide, Belgrade, Serbia

    Biljana Abolmasov, Uroš Đurić (2021)
    klizišta, monitoring
    ... 30 m towards the North and 0.50 m towards the West, while the vertical displacement was approximately -0.15 m for the 2014-2018 time span. Similar range of GNSS displacement rates were found in previously published results from GNSS monitoring activities realized from 2010-2014 (Abolmasov et al. 2015) ...
    ... landslide is formed on the right Sava river bank, 22 km southwest from Belgrade, and occupies part of Belgrade suburban settlement Umka. Geometry, geological settings, mechanism and material properties of Umka landslide were well defined by previous geotechnical investigations (Ćorić et al. 2016; Abolmasov ...

  • Mineralogical Discrimination between Authentic and Recent Imitations of Pottery Manufacture in Zlakusa, Serbia

    Maja Milošević, Mihovil Logar, Biljana Đorđević (2021)
    ... calculated according to CIE (1931) based on diffuse reflectance spectra recorded on a CCS200 spectrophotometer (Thorlabs) in the 380 - 1000 nm range. A standard method was used to determine the water absorption of the investigated shreds of pottery (SRPS ISO 10545-3) reduced to the same dimensions ...

  • Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation

    Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer (2021)
    kontinentalna tektonika: kompresija, kontinentalna tektonika: ekstenzija, kontinentalna tektonika: transkurentni i transformni rasedi, pukotine, rasedi, zone snažnih deformacija, kinematika deformacija kore i omotača, teorijska mehanika, modelovanje
    ... Hencky strains for large deformation is that lnλ spans a range between [−∞, ∞] instead of [0, ∞]. The Hencky principal strains thus have a more symmetric distribution around 0 (no deformation) compared to λ, where shortening falls in the [0, 1] range. We expect that in a tectonic context, isotropic area ...
    ... Hencky strains for large deformation is that /nA spans a range between [—00, 00] instead of [0, 00]. The Hencky principal strains thus have a more symmetric distribution around 0 (no deformation) compared to A, where shortening falls in the [0, 1] range. We expect that in a tectonic context, isotropic area ...
    ... linearly scale the original image RGB colour intensities in the 0.15–99.85 percentiles to the [0 1] intensity range, as the original colours span only a limited part of the intensity range. 5.3 General model evolution Initial deformation Fig. 12 depicts the principal stretches λmax, λmin and our ...

  • Multihazard Exposure Assessment on the Valjevo City Road Network

    Miloš Marjanović, Biljana Abolmasov, Svetozar Milenković, Uroš Đurić, Jelka Krušić, Mileva Samardžić Petrović (2019)
    Prirodni hazardi, izloženost, klizišta, poplave, bujice, GIS, R

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling

  • Demise of the Wetterstein Carbonate Platform and onset of the Dachstein Carbonate Platform recorded in deep-water successions of the East Bosnian-Durmitor megaunit (Pliješevina, northern Montenegro, Dinarides)

    Milica Mrdak, Eva Wagerer, Milan Sudar, Nevenka Djerić, Martin Đaković, Hans-Jürgen Gawlick (2024)
    Triassic, Carnica event, clay mineralogy, conodont biostratigraphy, Neo-Tethys

  • 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
    ... borcine bepsin activity "The influence of Al'* ions on porcine pepsin activity was investigated in the concentration range 1.7-10 “"M-8.7·:10 ~M at pH 2. We tested wide range of Al'? concentration that included physiologi- cal as well as toxic doses of metalion because oflackof similar information ...
    ... trg 12-16, 11000 Belgrade, Serbia (Received 3 July 2007; accepted 5 November 2007) Abstract The n vitro effect of AL ions in the concentration range 1.7-10 *M-8.7·10 ŽM on poepsin activity at pH 2, oia kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated ...

  • Просторни положај лежишта угља Ђурђевик: геофизичко-геолошки модел

    Синиша Арсеновић (2019)
    Лежиште угља Ђурђевик представља источни део Бановићког угљеног басена и припада северној страни босанске офиолитске зоне унутрашњих Динарида у чији састав улазе стене палеозојске, мезозојске и кенозојске старости. Језерска доњомиоценска угљоносна серија изграђена је од лапоровито-глиновитих седимената са једним слојем мрког угља. Дебљина угљеног слоја креће се у интервалу од 5 до 25 m са генералним правцем пружања СЗ - ЈИ и падом према ЈЗ. У зони обухваћеноj геофизичким истраживањима изражена je пострудна тектоника у виду раседа мањег и ...
    рефлективна сеизмика, 3Д геофизичко-геолошки модел, угаљ, синтетички модел, моделирање
    ... well as a reliable 3D model of the coal series. Keywords: reflective seismic, 3D geophysical-geological model, coal, synthetic model, modeling Scientific field: Geological engineering Scientific subfield: Geophysics UDC: 553.94:550.83(043.3) ...
    ... FACULTY OF MINING AND GEOLOGY Siniša Ž. Arsenović THE SPATIAL POSITION OF ĐURĐEVIK COAL BASEIN: GEOPHYSICAL- GEOLOGICAL MODEL Doctoral Dissertation Belgrade, 2019 Ментор: _______________________________________________ др ...
    ... THE SPATIAL POSITION OF ĐURĐEVIK COAL BASEIN: GEOPHYSICAL-GEOLOGICAL MODEL Abstract Coal deposit Đurđevik represents the eastern part of the Banović coal basin and belongs to the northern side of the Bosnian ...

  • Frequency and Length of Syllables in Serbian

    Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)
    Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.
    frekvencije slogova, dužina slogova, srpski jezik
    ... a normalization constant and not an independent parameter, i.e. its value depends on parameters 𝑎 and 𝑏). These parameter values are out of the range of values for rank-frequency distribution for word forms16 (cf. Popescu et al. 2009, pp. 137-138; the highest value of 𝑎 is 1.6543 for a Hawaiian ...
    ... is a normalization constant and not an independent parameter, i.e. its value depends on parameters a and b). These parameter values are out of the range of values for rank-frequency distribution for word forms!® (cf. Popescu et al. 2009, pp. 137-138; the highest value of a is 1.6543 for a Hawaiian text ...
    ... the rank-frequency distribution of syllables exceed those for words, and in the model for the distribution of syllable length they are out of the range of values observed for word length (Popescu et al., 2013, pp. 229-233).21 The different strengths of correlations (for the relations between word ...

  • Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)

    Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)
    Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... voltage, kV 40 Current, mA 30 X-ray radiation from the copper (Cu) anticathode, Wavelength, nm 15.4178 Scan range, 2  o 2 – 70 Step size, 2  o 0.01 Time constant, o / min 10 Scan range (clay minerals), 2  o 2 – 30 Step size (clay minerals), 2  o 0.01 Time constant (clay minerals), o / ...
    ... stock solution amounted to 2000 mg L-1, and working solutions used for determining sorption capacity and Freundlich adsorption isotherm were in the range of 500– 1500 mg L-1. All solutions were analyzed by ICP-OES technique (SPECTRO- BLUE TI). The calibration solutions were prepared from the stock solution ...
    ... NORM residue management in the production of rare earths from thorium containing minerals, Safety Reports Series 68 (2011) 259 13. G. Haxel, US Geological Survey 87 (2002) (https://pubs.usgs.gov/fs/2002/fs087-02) 14. C. Ng, J. N. Losso, W. E. Marshall, R. M. Rao, Bioresource technology 85 (2002) 131 ...

  • Mineralogical analysis of a clay body from Zlakusa, Serbia, used in the manufacture of traditional pottery

    Maja Milošević, Biljana Đorđević, Mihovil Logar (2020)
    калцит, сирова глина, традиционална керамика, Злакуса
    ... it e de po si t 143 Geological units 'Conglomerate and incoherent sandstone Mari and dolomite Phyllite Metasandstone 3 Sandstone, slate, I andphylite Alluvium [%] Teraces Deposit of cement marl Research area Lat: 43.8779600 Lon:19.9718600 Geological units BBM Bedded andhick-bedded ...
    ... Commerce, Industry and Navigation. Foldvari M. (2011) Handbook of the thermogravimetric system of minerals and its use in geological practice. Occasional Papers of Geological Institute of Hungary, 213, 180. Frost R.L., Van Der Gaast S.J., Zbik M., Kloprogge J.T. & Paroz G.N. (2002) Birdwood kaolinite: ...
    ... diffraction (XRPD) data were collected on a Rigaku SmartLab X-ray powder diffractometer using Bragg- Brentano geometry and Cu-Ko. radiation in the scan range of 3-70%0 with a step size of O0.01% and a scanning speed of 2% min !. The diffractometer was operated at 40kV and 30 mA. The XRPD experiments were ...

  • 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 ...
    Kinetika, Ravnoteža, Ru(II), L-Histidin, Guanozin-5' -monofosfat, Dimetilsulfoksid, Tiourea
    ... cisplatin was discovered, a number of platinum complexes have been synthesized and evaluated as potential chemotherapeutic agents [1–3]. The limited range of activity of cisplatin and its analogs and their several side effects have stimulated the search for other metal-based anticancer drugs with metal ...
    ... diagram for [Ru(trpy)(bpy)H2O] 2? hydrolytic species is shown in Fig. 3. The complex ion [Ru2(trpy)2(bpy)2(OH)] 3? is present in the system in a pH range between 2.0 and 7.0, with the maximum in concen- tration at pH = 4. This ion is assumed to form through the dimerization of [Ru(trpy)(bpy)H2O] 2? ...
    ... diagram for [Ru(trpy)(bpy)H,O]?* hydrolytic species is shown in Fig. 3. The complex ion [Ru.(trpy)2(bpy)2(OH)]* * is present in the system in a pH range between 2.0 and 7.0, with the maximum in concen- tration at pH = 4. This ion is assumed to form through the dimerization of [Ru(trpy)(bpy)H,O]** and ...

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... obtained with CuKα radiation (λ = 1,54178×10−10 m), created in the X-ray tube at 30 mA and a voltage of 40 kV. Record the sample is performed in the range of 2θ from 5 to 50° with a step of 0,02° and a retention time of 0,5 s at each step. The data position of the diffraction peaks 2θ (°), the value ...
    ... strength After 7 days in a wet environment the samples were taken from PPNT A, and tested on uniaxial compressive strength, and were in a strenght range from 398 to 1333 kPa. Test results are shown in Tab. 10, and it can be seen that the cement (C) is better binder than the lime (L). The maximum value ...
    ... 05 3.5.3 The modulus of elasticity After 7 days of the sample storage in the wet chamber, the modulus of elasticity was tested and was in range from 58.000 to 289.000 kPa. The maximum modulus of elasticity is obtained by adding 4 % of the cement as the binder. With the greater amount of cement ...