Претрага
2618 items
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Correlation of uniaxial compressive strength with the dynamic elastic modulus, p –wave velocity and s –wave velocity of different rock types
Knowing mechanical properties of rocks incorporated with ultrasonic waves velocities investigations provide a secure basis for mine modelling. Uniaxial compressive strength, dynamic elastic modulus and ultrasonic waves velocities are just some of the rock properties that indicate on presence of discontinuities, stratification and fissures of rocks. Determining the relationship of these rock properties testing the rock samples that are corresponding to different rock types extracted from different mineral deposits represents the core of this study. In this paper, we ...Jelena Majstorović, Miloš Gligorić, Suzana Lutovac, Milanka Negovanović, Luka Crnogorac. "Correlation of uniaxial compressive strength with the dynamic elastic modulus, p –wave velocity and s –wave velocity of different rock types" in Underground mining engineering, Рударско - геолошки факултет - Београд (2019)
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The number of nonunimodular roots of a reciprocal polynomial
Dragan Stankov (2023)We introduce a sequence Pd of monic reciprocal polynomials with integer coefficients having the central coefficients fixed as well as the peripheral coefficients. We prove that the ratio of the number of nonunimodular roots of Pd to its degree d has a limit L when d tends to infinity. We show that if the coefficients of a polynomial can be arbitrarily large in modulus then L can be arbitrarily close to 0. It seems reasonable to believe that if ...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 nonunimodular roots of a reciprocal polynomial" in Comptes rendus mathematique, Elsevier France Editions Scientifiques et Medicales (2023). https://doi.org/10.5802/crmath.422
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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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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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Simpson's rule application for experimental determining parameters of rock mass oscillation equation at limestone
By its form, the use of explosives has a destructive character. However, energy of chemical explosives is tamed and perfected in many effects, so that is developed a series of activities which work is unthinkable without the use of explosives. In mining industry, explosives are most commonly used for exploitation in hard rock mass. Thereby, large amounts of explosives can be used, especially for mass blasting. The application of large amounts of explosives gives auspicious techno – economic indicators ...working environment, seismic effects of blasting, oscillation velocity, rock mass oscillation equation, Simpson’s ruleSuzana Lutovac, Miloš Gligorić, Jelena Majstorović, Branko Gluščević, Luka Crnogorac. "Simpson's rule application for experimental determining parameters of rock mass oscillation equation at limestone" in 8th International Conference Mining and Environmental Protection, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2021)
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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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On the distribution modulo 1 of the sum of powers of a Salem number
Dragan Stankov (2016)It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.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. "On the distribution modulo 1 of the sum of powers of a Salem number" in Comptes rendus Mathematique (2016). https://doi.org/10.1016/j.crma.2016.03.012
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Fuzzy optimization in hydrodynamic analysis of groundwater control systems: Case study of the pumping station “Bezdan 1”, Serbia
Dragoljub Bajić, Dušan Polomčić (2014)A groundwater control system was designed to lower the water table and allow the pumping sta-tion “Bezdan 1” to be built. Based on a hydrodynamic analysis that suggested three alternative solutions, mul-ticriteria optimization was applied to select the best alternative. The fuzzy analytic hierarchy process methodwas used, based on triangular fuzzy numbers. An assessment of the various factors that influenced the selec-tion of the best alternative, as well as fuzzy optimization calculations, yielded the “weights” of the alternativesand the ...groundwater lowering, groundwater management scenario, fuzzy analytic hierarchy process,expert knowledge, triangular fuzzy numbers, linguistic variables... values of the weights are ob- tained applying one of the normalization methods: • The additive normalization method (SAATY 1980), or • The weighted least squares method (CHU et al. 1979), the logarithmic least squares method (CRAWFORD & WILLIAMS 1985), the fuzzy prefer- ence programming method (MIKHAILOV ...
... (MIKHAILOV 2000), the direct least squares method (CHU et al. 1979), which often yields multiple solutions, or the loga- rithmic goal programming method (BRYSON 1995). This results in a normalized weight vector in the form of a classical non-fuzzy number, whose maxi- mum value is 1: Step 6. In this step ...
... Journal of Management Science, 35: 417–431. CHANG, D.Y. 1996. Applications of the extent analysis method on fuzzy AHP. European Journal of Operational Research, 95: 649–655. CHANG, Y.H., CHENG, C.H. & WANG, T.C. 2003. Performan- ce evaluation of international airports in the region of East Asia ...Dragoljub Bajić, Dušan Polomčić. "Fuzzy optimization in hydrodynamic analysis of groundwater control systems: Case study of the pumping station “Bezdan 1”, Serbia" in Geološki anali Balkanskoga poluostrva, Belgrade : University of Belgrade - Faculty of mining and geology (2014). https://doi.org/10.2298/GABP1475103B
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Nonequilibrium athermal random-field Ising model on hexagonal lattices
Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević. "Nonequilibrium athermal random-field Ising model on hexagonal lattices" in Physical Review E, American Physical Society (APS) (2021). https://doi.org/10.1103/PhysRevE.103.032147
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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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A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System
This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFISMiljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić. "A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System" in Energies, MDPI AG (2023). https://doi.org/10.3390/en16072958
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Application of ERT in the study of debris-flow source area: Case study Selanac debris flow
Dragana Đurić, Jelka Krušić, Biljana Abolmasov. "Application of ERT in the study of debris-flow source area: Case study Selanac debris flow" in 11th Congress of the Balkan Geophysical Society, Volume 2021, Online-Romania, 10 -14. Oct 2021,, European Association of Geoscientists & Engineers (2021). https://doi.org/10.3997/2214-4609.202149BGS15
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Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit
... commonly. In this study, parameters n and K in the law of Sadovsky were determined in two ways – models in the given work environ- ment. The first model is the usual method of least squares, and the second model is de- rived by applying the Lagrange’s theorem. Thereby corresponding functions were ob- ...
... effect of blasting. In accordance with this, an analysis of the method for determining the soil oscillation law parameters, proposed by the Russian professor M.A. Sadovsky, was performed. For determination of parameters in the Sadovsky equation, in addition to the usual model - the least squares ...
... The same is valid for the absolute val- ue of linear correlation coefficient r. As a convenience measure of the ob- tained functional relationship for the given experimental data, the criterion „3S“ was also used [6]. This criterion uses the squares of differences between the obtained experi- mental ...Suzana Lutovac, Nebojša Vidanović, Čedomir Beljić, Zoran Gligorić. "Soil oscillation law parameter determination with the application of Lagrange’s theorem at “Kovilovača“ open pit" in Mining and Metallurgy Engineering Bor, Bor : Mining and Metallurgy Institute Bor (2015). https://doi.org/10.5937/MMEB1503053L
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Палеомагнетски резултати из Тимочког магматског комплекса, Источна Србија
... on a sphere. Proceedings of the Royal Society London, 217, 295‐305. Kirschvink, J.L., 1980. The least‐squares line and plane and the analysis of paleomagnetic data. Geophy‐ sical Journal of the Royal Astronomical Society, 62, 699–718. Lowrie, W., 1990. Identification of feromagnetic minerals in ...
... the natural remanent magnetization (NRM) of each sample was measured. This was followed by stepwise demagnetization of sister speci‐ mens of selected samples, one with alternating field, the other with thermal method (accompanied by the monitoring of the magnetic susceptibility) till the magnet ...
... Geodetic Authority, Department of Geomagnetism and Aeronomy, Belgrade, Serbia, e‐mail: vlesić@drenik.net 2) Mining and Gelogical Survey of Hungary 3) Nature History Museum, Belgrade, Serbia 4) University of Belgrade, Faculty of Mining and Geology, Depratment of Geophysics, Belgrade, Serbia ...Весна Лесић, Емо Мартон, Драган Лукић, Весна Цветков. "Палеомагнетски резултати из Тимочког магматског комплекса, Источна Србија" in Knjiga apstrakata 17. Kongres geologa Srbije, Vrnjačka Banja 17-20. maj 2018., Српско геолошко друштво (2018)
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2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem
... One-dimensional methods (1D) are used only when we want to get the information of the thickness and depth of layers, without knowing what kind of lateral changes are present. This kind of survey method requires the least amount of data that has to be acquired and therefore is the cheapest. Two-dimensional ...
... had to enable the least amount of attenuation to electromagnetic signals. At the depth that corresponds to the two-way travel time of 200 ns,the horizontal reflection is noticed that could indicate a horizontal interface, that was not detected with the geoelectrical scanning method. Acquired borehole ...
... aspect, this kind of method was a logical choice. 2D geoelectrical resistivity tomography … 61 Figure 1 Satellite image of the surveyed field (Google Earth) Accounting for the occurrence of the subsurface material (anthropogenic) the stratigraphic column is of little use, except to provide ...Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov. "2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem" in Podzemni radovi, Centre for Evaluation in Education and Science (CEON/CEES) (2019). https://doi.org/10.5937/PodRad1934059S
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Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine
... Sadovski. The applicability of this law was analysed on examples of mass blasting in the "Nepričava" Open Pit Mine being carried out in order to exploit the deposit. To determine parameters in the equation of Sadovski, in addition to the common method of least squares, another model was applied. Thereby ...
... same is valid for the absolute value of linear correlation coefficient r. As a convenience measure of the obtained functional relationship for the given experimental data, the criterion "3S" was also used (Vukadinović, 1970). This criterion uses squares of differences between the obtained experimenal ...
... the explosive amount, and conditions of blasting and geologic characteristics of the soil, being determined on the basis of test blasting for the specific work environment. In this paper, an analysis of the method for the determination of soil oscillation law parameters has been conducted, suggested ...Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina. "Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine" in Underground Mining Engineering, Belgrade : University of Belgrade, Faculty of Mining and Geology (2015). https://doi.org/10.5937/podrad1526009L
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Polymorphism and photoluminescence properties of K3ErSi2O7
alkalni silikati elemenata retkih zemalja, silikati lantanoida, polimorfizam, fotoluminescencija, kristalna strukturaPredrag Dabić, Marko G. Nikolić, Sabina Kovač, Aleksandar Kremenović. "Polymorphism and photoluminescence properties of K3ErSi2O7" in Acta Crystallographica Section C Structural Chemistry, International Union of Crystallography (IUCr) (2019). https://doi.org/10.1107/S2053229619011926
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Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”
... crosscut in a horizontal plane between the VI horizon and the P2 SD adit of the "Blagodat". Underground Mining Engineering, n. 23, p. 33-44, 2013. WOLF, P. R., GHILANI, C. D. Adjustment computations - statistics and least squares in Surveying and GIS. New York: John Wiley & Sons, Inc., 1997. ...
... FACULTY OF MINING AND GEOLOGY. The main mining project for under- ground mining of bauxite reserves remainingin the deposit "Podbracan". Belgrade: 2008. [In Serbian] THE GOVERNMENT OF THE REPUBLIC OF SERBIA. Rulebook on the method for executing of mine surveying. Of�cialGazette of the Republic of Serbia ...
... slopes of the Javor and Susica mountains in the territory of the municipality Milici – Bosnia and Herzegovina (The Republic of Srpska). The ore reserves of the bauxite deposit of "Podbracan" were excavated till 2010 by using the open pit method of mining at the central and northern part of the deposit ...Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić. "Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”" in Revista Escola de Minas, School of Mines Magazine, Sao paulo, Brasil : SciELO (2015)
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Some models for determination of parameters of the soil oscillation law during blasting operations
... 1—Determining the Parameters by Applying the Least Square Method The least square method is mainly used to obtain the parameters K and n representing a common model [5,6]. 2.2.2. Model 2—Determining the Parameters by Applying the Quotient of the Relative Growth of Oscillation Velocities and Reduced Distances ...
... determination of parameters K and n in the Sadovskii equation. To determine the parameters in the Sadovskii formula, in addition to the usual least square method, two more new models were applied. In the models the parameters K and n were determined by applying the quotient of the relative growth of oscillation ...
... As a convenience measure of the obtained functional relationship for the given experimental data, the criterion “3S” was also used [10]. This criterion uses squares of differences between the obtained experimental data and the calculated ones for oscillation velocities of v. If those differences are ...Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić. "Some models for determination of parameters of the soil oscillation law during blasting operations" in Energies, Basel, Switzerland : MDPI (2018). https://doi.org/10.3390/en9080617
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GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities
Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević . "GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities" in Contributions to International Conferences on Engineering Surveying. Springer Proceedings in Earth and Environmental Sciences, Dubrovnik, Croatia, October 22-23, 2020, Springer, Cham (2021). https://doi.org/10.1007/978-3-030-51953-7_21