Претрага
2335 items
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Low-temperature phase transition and magnetic properties of K3YbSi2O7
Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović (2021)alkalni silikati elemenata retkih zemalja, fazni prelazi, magnetne karakteristike, razdvajanje kristalnog polja, silikati lantanica... the Curie–Weiss law (1) to ��1(T) data above 150 K gives � = �56 K. This clearly illustrates how much the � value can be biased by the crystal field influence when extracted from high- temperature fitting to the Curie–Weiss law. Using (2), it was possible to obtain the positions and effective magnetic ...
... the Curie-Weiss law (1) to x~'(T) data above 150K gives 6 = —56 K. This clearly illustrates how much the @ value can be biased by the crystal field influence when extracted from high- temperature fitting to the Curie-Weiss law. Using (2), it was possible to obtain the positions and effective magnetic ...
... by Curie–Weiss law: � ¼ N�2 B� 2 eff 3kðT � �Þ ¼ C T � � : ð1Þ Expression (1) contains quantities with their usual abbrevia- tions: N (Avogadro number), �B (Bohr magneton), �eff (effective magnetic moment), k (Boltzmann constant), C (Curie constant), T (temperature in K) and � (Curie–Weiss ...Predrag Dabić, Volker Kahlenberg, Biljana Krüger, Marko Rodić, Sabina Kovač, Jovan Blanuša, Zvonko Jagličić, Ljiljana Karanović, Václav Petříček, Aleksandar Kremenović. "Low-temperature phase transition and magnetic properties of K3YbSi2O7" in Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, International Union of Crystallography (IUCr) (2021). https://doi.org/10.1107/S2052520621006077
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Cementation of sandstones from Paleozoic, Mesozoic and Tertiary formations in Libya
Vasić Nebojša, Selah Turki, Srećković Batoćanin Danica, Savić Marija, Sherif Khalid, Andrić Nevena (2011)Vasić Nebojša, Selah Turki, Srećković Batoćanin Danica, Savić Marija, Sherif Khalid, Andrić Nevena. "Cementation of sandstones from Paleozoic, Mesozoic and Tertiary formations in Libya" in Proceedings, 1st International Conference “HARMONY OF NATURE AND SPIRITUALITY IN STONE”, 17-18 March 2011, Kragujevac, Kragujevac:Stone Studio Association (2011): 229-341
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Petrologic and technical properties of the Triassic limestone from the open pit Rupeljevo
Avramović Nikola, Matović Vesna, Gajić Violeta, Srećković Batoćanin Danica, Matović Nenad, Munjas Branko (2012)Avramović Nikola, Matović Vesna, Gajić Violeta, Srećković Batoćanin Danica, Matović Nenad, Munjas Branko. "Petrologic and technical properties of the Triassic limestone from the open pit Rupeljevo" in Proceedings / 2nd International Conference Harmony of Nature and Spirituality in Stone, 15-16 March 2012, Kragujevac, Belgrade:Stone Studio Association (2012): 97-107
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GIS analysis of dissipation time of landscape in the Devil's city (Serbia)
Valjarević A., Srećković- Batoćanin Danica, Živković D., Perić, M.. "GIS analysis of dissipation time of landscape in the Devil's city (Serbia)" in Acta Montanistica Slovaca (2015): 148-155
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Stochastic nature of earthquake ground motion
Kostić Srđan, Vasović Nebojša, Perc Matjaz, Toljić Marinko, Nikolić Dobrica. "Stochastic nature of earthquake ground motion" in Physica A: Statistical Mechanics and its Applications 392 no. 18, Amsterdam:Elsevier (2013): 4134-4145
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The role of non-covalent intermolecular interactions on the diversity of crystal packing in supramolecular dihalopyridine–silver(i) nitrate complexes
Sunčica Roca, Lucija Hok, Robert Vianello, Mladen Borovina, Marijana Đaković, Ljiljana Karanović, Dražen Vikić-Topić, Zora Popović (2020)Six novel 1 : 2 complexes of silver(I) nitrate with 2,5-, 2,6- and 3,5-dihalopyridines (halo stands for chlorine and bromine) were prepared by the reaction of an aqueous solution of AgNO3 and the corresponding pyridine derivative in a water–alcohol solution. In spite of having analogous empirical formulae, they reveal intriguing structural differences, except [Ag(NO3)(2,5-Cl2py)2]n (1) and [Ag(NO3)(2,5-Br2py)2]n (4), which are isostructural. In contrast, [Ag(NO3)(3,5-Cl2py)2]2 (3) is dimeric, while its Br analogue [Ag(NO3)(3,5-Br2py)2]n (6) is polymeric in nature, being the ...Sunčica Roca, Lucija Hok, Robert Vianello, Mladen Borovina, Marijana Đaković, Ljiljana Karanović, Dražen Vikić-Topić, Zora Popović. "The role of non-covalent intermolecular interactions on the diversity of crystal packing in supramolecular dihalopyridine–silver(i) nitrate complexes" in CrystEngComm, Royal Society of Chemistry (RSC) (2020). https://doi.org/10.1039/D0CE01257B
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Development and Application of Methodology for Quantification of Overbreaks in Hard Rock Tunnel Construction
A methodology for determining overbreaks in hard rock tunnel construction using the drill-and-blast technique is presented in this paper. The methodology was developed for and applied to crystalline medium- to thick-bedded limestone, but it can be used in any jointed hard rock mass. Overbreaks are inevitable in hard rock tunnelling in a low-confinement environment (shallow tunnels up to several hundred meters deep) as a result of wedge failures along unfavourably oriented discontinuities caused by blasting. It is widely accepted ...hard rock, drill-and-blast, geological overbreak, technological overbreak, stability criterion, discontinuity orientation, tunnel constructionZoran Berisavljević, Dragoljub Bajić, Vojkan Jovičić. "Development and Application of Methodology for Quantification of Overbreaks in Hard Rock Tunnel Construction" in Applied Sciences, MDPI (2023). https://doi.org/10.3390/app13031379
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Malathion-induced inhibition of human plasma cholinesterase studied by the fluorescence spectroscopy method
The in vitro effect of technical grade malathion was assessed via the kinetic parameters of human plasma butyrylcholinesterase (BChE) using N-methylindoxyl acetate as a substrate for BChE. An inhibitor kinetics study demonstrated the existence of a biphasic inhibition curve, indicating high- and low-affinity binding sites of malathion. The IC50 values as calculated from the experimental inhibition curves were 1.33 × 10–9 and 1.48 × 10–5 M for the high- and low-affinity binding sites, respectively; Hill’s analysis gave 1.29 × ...V. M. Pavelkić, K. S. Krinulović, J. Z. Savić, M. A. Ilić. "Malathion-induced inhibition of human plasma cholinesterase studied by the fluorescence spectroscopy method" in Russian Journal of Physical Chemistry A, Pleiades Publishing Ltd (2008). https://doi.org/10.1134/S0036024408050312
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Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling
Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeBranislav Petrović, Veljko Marinović, Zoran Stevanović. "Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling" in Environmental Earth Sciences, Springer Science and Business Media LLC (2023). https://doi.org/10.1007/s12665-023-10911-5
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Digital Library From A Domain Of Criminalistics As A Foundation For A Forensic Text Analysis
U ovom radu predstavljen je model koji omogućava prikupljanje, pripremu, opis metapodataka, upravljanje i eksploataciju, uključujući pretragu punog teksta dokumenata iz domena kriminalistike napisanih na srpskom jeziku. Predloženi pristup primenjuje se na veb portalu koji sakuplja različite tekstove nastale iz časopisa Akademije za kriminalistiku i policijske studije, Krivičnog zakona Srbije, konferencija „Tara“ i „Reiss“, kao i iz nekih doktorskih disertacija vezanih za ovu oblast istraživanje. Nakon obrade teksta, korpus koji sadrži preko 5500 stranica običnog teksta, kreiran je i ...... types classification and syntax and semantic analysis of texts written in a natural language. Various texts are subject of the study: Acts of Parliament (or other law-making body), private wills, court judgements and summonses and the statutes of the bodies such as States and government departments ...
... Their Content & "Signature"" 6 John Olsson (2004). An Introduction to Language Crime and the Law. London: Continuum International Publishing Group 7 C.S. Michell (2013). Investigating the use of forensic stylistic and stylometric techniques in the analysis of authorship on a publicly accessible social ...
... ISBN 978-0-8264-6109-4 12. John Olsson (2004). An Introduction to Language Crime and the Law. London: Continuum International Publishing Group 13. C.S. Michell (2013). Investigating the use of forensic stylistic and stylometric techniques in the analysis of authorship on a publicly accessible social ...Dalibor Vorkapić, Aleksandra Tomašević, Miljana Mladenović, Ranka Stanković, Nikola Vulović. "Digital Library From A Domain Of Criminalistics As A Foundation For A Forensic Text Analysis" in International Scientific Conference “Archibald Reiss Days” Thematic Conference Proceedings Of International Significance, Belgrade, 7-9 November 2017, Academy Of Criminalistic And Police Studies Belgrade (2017)
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An aproach to Implementation of blended learning in a university setting
... instruction, and their obligations and responsibilities are undergoing a substantial change. The approach that combines elements of traditional and e-learning paradigms, which is thus hybrid in its nature, offers a great extent of flexibility in applying ICT to learning, and often goes under ...
... offers and overview of student results for different assignments. Teachers can use this report to analyze student grades for different assignments at the course level. 5. POSTGRADUATE STUDIES Organization of educational content The specific nature of postgraduate (master and doctoral) ...
... e Moodle platform. Depending of the nature of specific courses, other software tools are also becoming part of the instruction process, especially for ICT oriented courses. We illustrate our approach on the example of the undergraduate course Informatics I and the postgraduate course InfoTeh. ...Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović . "An aproach to Implementation of blended learning in a university setting" in Proceedings of the Second International Conference on e-Learning, eLearning 2011, September 2011, Belgrade, Serbia, Belgrade : Belgrade Metropolitan University (2011)
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Cretaceous ultrapotassic magmatism from the Sava-Vardar Zone of the Balkans
Kristijan Sokol, Dejan Prelević, Rolf Romer, Milica Božović, Paul van den Bogaard, Elitsa Stefanova, Bojan Kostić, Nenad Čokulov (2020)Late Cretaceous global plate reorganization associated with the inception of counterclockwise rotation of Africa relative to Europe initiated in the Balkan region small-volume magmatism of diverse geochemical signature along the enigmatic Sava-Vardar Zone. We study a Late Cretaceous lamprophyric sill in Ripanj village near Belgrade to constrain this magmatic episode. The lamprophyre is characterized by high contents of Na, P, Fe and Al, and low contents of K, Ca and Mg. Its original nature (Na, K, Ca and Mg) is ...Kristijan Sokol, Dejan Prelević, Rolf Romer, Milica Božović, Paul van den Bogaard, Elitsa Stefanova, Bojan Kostić, Nenad Čokulov. "Cretaceous ultrapotassic magmatism from the Sava-Vardar Zone of the Balkans" in Lithos (2020)
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Effects of external noise on threshold-induced correlations in ferromagnetic systems
Dragutin Jovković, Sanja Janićević, Svetislav Mijatović, Lasse Laurson, Đorđe Spasojević. "Effects of external noise on threshold-induced correlations in ferromagnetic systems" in Physical Review E, American Physical Society (APS) (2021). https://doi.org/10.1103/PhysRevE.103.062114
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Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty
... 77–89. FAVARO M. et al. (2006) Evaluation of polymers for conservation treatments of outdoor exposed stone monuments, Part I. Photo-oxidative weathering. Polymer Degradation and Stability, 91, pp. 3083–3096. FORT R., DE BUERGO M. A. and PEREZ-MONSERRAT E. M. (2013) Non- destructive testing for ...
... use of ultrasound pulse velocity measurements. In: Heritage, weathering and conservation. 2nd ed. London: Taylor and Francis Group plc; pp. 749-756 PETRUŽÁLEK M. et al. (2008) Changes of anisotropy of p-wave velocity propagation during deformation process of rock samples. In: 28-European Conf ...
... special isotropic and anisotropic sample and for each special direction, respectively, is calculated by Equations (4), (5), (6), (7), (8), (9), (10) and (11) based on arithmetic operations (2) and (3). Anisotropy coefficient for each special isotropic and anisotropic sample and for each special ...Miloš Gligorić, Jelena Majstorović, Suzana Lutovac. "Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty" in Underground Mining Engineering, Belgrade : University of Belgrade - Faculty of Mining and Geology (2018). https://doi.org/10.5937/PodRad1832001G
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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 ...... ions, physiological and toxic ones, on pepsin activity. Moreover, extensive kinetic studies were undertaken to determine the nature of the enzyme modulation (type and mechanism) by investigated metal ion. Besides, we compared the electrophoretic mobility in the absence and presence of investigated ...
... maximal velocity (Vmax) and k.a. values rather than apparent affinity for substrate (Ks) implying the non-competitive nature of activation which indicated that aluminium wWas a non-essential activator of partial non-competitive type. The values of the equilibrium constants Ks and KA for dissociation ...
... for 135.8% (p < 0.01), in comparison with corresponding control. Kınetic analysis In order to evaluate the nature of porcine pepsin activation induced by Al , kinetic parameters Ks and Vonax Were determined by varying the concentration of substrate-denatured haemoglobin. The kinetic prop- ...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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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 Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach
Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (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 ...fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependabilityNikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović. "A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach" in Applied Sciences, Basel, August 2024, MDPI (2024). https://doi.org/https://doi.org/10.3390/app14177947
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Approach to operational mine planning: Case study Tamnava West
... problem owing to the variable nature of coal properties (heating value, sulfur, ash), even within the same coal seam. In order to ensure a normal and efficient operation of the power plants fed with coal it is necessary to reduce the variation of the coal and that is done through coal hom ...
... is especially important to have enough of in situ data, and to conduct quality operational planning. The importance of operational planning for coal quality control is stressed by Stevanović et. al. 7. Also due to the complex nature of coal operational planning, usage of specialized commercial ...
... allow less dilution effects and greater recovery of reserves. For the case of Tamnava West minimal minable thickens of coal seam was set to 0,5 m. The final design of benches is done in Minex. Although Minex has module for bench design, due to complex nature of bench geometry for Tamnava ...Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković. "Approach to operational mine planning: Case study Tamnava West" in Tehnika, Beograd : Savez inženjera i tehničara Srbije (2014). https://doi.org/10.5937/tehnika1406952S
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VENTEX: An Expert System for Mine Ventilation Systems Analysis
Analiza sistema za ventilaciju je komleksan proces, koji bazira na proračunu brojnih parametara, koji se odnose na: stanje mreže, provetrenost, stabilnost sistema, gubitke vazduha, klimatske uslove, gasno stanje, ugroženost od požara i opasne prašine. Navedeni problemi se uspešno rešavaju paketom SimVent, ali potpuno razumevanje i korišćenje dobijenih rezultata zahteva angažovanje iskusnog specijaliste iz oblasti ventilacije. Rešenje je nađeno u kreiranju ekspertnog sistema VENTEX, čija je baza znanja formalizacija ekspertskog znanja iz oblasti ventilacije rudnika. U radu je prikazana metodologija ...... analysis are usually of a very complex nature. They involve the estimation of numerous interdependent parameters pertaining to the network status, ventilation status, ventilation system stability, air current losses, climate conditions, gas state, fire risk and dangerous dust pollution risk. The ...
... approach bearing in mind the coupled numerical-symbolic nature of the system aimed at solving a hierarchically structured problem. The obtained system structure of the VENTEX system was realized in KAPPA-PC.. References Coad,P., and Yourdon,E., (1991), Object-Oriented Analysis, Second ...
... facts and heuristics which can be represented by means of rules, frames, semantic networks and other formalisms. Since knowledge is the key factor in problem solution and decision making, the quality and usability of an expert system is basically determined by the accuracy and completeness ...Ranka Stanković, Nikola Lilić, Ivan Obradović. "VENTEX: An Expert System for Mine Ventilation Systems Analysis" in YU Info '96 Brezovica, Društvo za informacione sisteme i računarske mreže (1996)
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The Content of Toxic Metals in Agricultural Produce near a Coal Mine: Case Study KCB in Lazarevac, Serbia
Праћење и анализа концентрација токсичних метала (олово и кадмијум) у земљишту и усевима указују на то да пољопривредно земљиште у Србији углавном није загађено, а квалитет земљишта је природно добар. Због тога су таква земљишта погодна за органску пољопривреду. Сви уочени случајеви контаминације токсичним металима су само локалне природе, а резултат су ђубрива и пестицида, комуналног отпада, издувних гасова, оближњих производних објеката, топионица, рудника, јаловишта итд. Локације овог типа морају бити редовно прати и процењује статус земљишта и усева. ...Ana Koprivica, Čedomir Beljić, Boris Vakanjac, Vesna Ristić Vakanjac, Marina Čokorilo Ilić. "The Content of Toxic Metals in Agricultural Produce near a Coal Mine: Case Study KCB in Lazarevac, Serbia" in Minerals, MDPI AG (2018). https://doi.org/10.3390/min8040131