Jovana B. Veselinović, Goran M. Nikolić, Nataša Trutić, Jelena Živković, Aleksandar M. Veselinović,
A series of 278 organophosphate compounds acting as acetylcholinesterase inhibitors has been studied. The Monte Carlo method was used as a tool for building up one-variable quantitative structure–activity relationship (QSAR) models for acetylcholinesterase inhibition activity based on the principle that the target endpoint is treated as a random event. As an activity, bimolecular rate constants were used. The QSAR models were based on optimal descriptors obtained from Simplified Molecular Input-Line ...
Tópico(s): Pesticide Exposure and Toxicity
2015 - Taylor & Francis | SAR and QSAR in environmental research
Miodrag Živković, Aleksandar Petrović, K. Venkatachalam, Ivana Strumberger, Hothefa Shaker Jassim, Nebojša Bačanin,
The COVID-19 pandemic period is approaching the two-year mark of its lifetime. During the pandemic, the people experienced various restrictions and different problems were raised unlike before. While the people stayed in their homes, electronic device usage had a decisive spike. This increased time spent on the internet and the amount of misinformation followed the same trend. The problem with the information on the COVID-19 is that there are too many different sources presenting different data. ...
Tópico(s): Spam and Phishing Detection
2022 - Springer Nature | Studies in computational intelligence
Miodrag Živković, Aleksandar Petrović, Nebojša Bačanin, Stefan Milosevic, Vasilije Veljic, Ana Vesić,
The research proposed in this paper shows the application of the MobileNetV3 and improved sine cosine algorithm utilized for solving problems of optimization, thus including COVID-19 image classification. The algorithm that is the subject of optimization is a more recent solution in the field of population-based algorithms. The algorithm initializes random solutions upon each new iteration, and these solutions are candidates for the optimal solution. Solutions should generally tend toward the best ...
Tópico(s): Image Processing Techniques and Applications
2022 - Springer International Publishing | Lecture notes on data engineering and communications technologies
Nebojša Bačanin, Ruxandra Stoean, Miodrag Živković, Aleksandar Petrović, Tarik A. Rashid, Timea Bezdan,
Swarm intelligence techniques have been created to respond to theoretical and practical global optimization problems. This paper puts forward an enhanced version of the firefly algorithm that corrects the acknowledged drawbacks of the original method, by an explicit exploration mechanism and a chaotic local search strategy. The resulting augmented approach was theoretically tested on two sets of bound-constrained benchmark functions from the CEC suites and practically validated for automatically ...
Tópico(s): Neural Networks and Reservoir Computing
2021 - Multidisciplinary Digital Publishing Institute | Mathematics
Lidija Šenerović, Marija D. Živković, Aleksandar M. Veselinović, Aleksandar Pavić, Miloš I. Djuran, Snežana Rajković, Jasmina Nikodinović‐Runić,
Polynuclear Pt(II) complexes are a novel class of promising anticancer agents with potential clinical significance. A series of pyrazine (pz) bridged dinuclear Pt(II) complexes with general formulas {[Pt(L)Cl]2(μ-pz)}2+ (L, ethylenediamine, en; (±)-1,2-propylenediamine, 1,2-pn; isobutylenediamine, ibn; trans-(±)-1,2-diaminocyclohexane, dach; 1,3-propylenediamine, 1,3-pd; 2,2-dimethyl-1,3-propylenediamine, 2,2-diMe-1,3-pd) and one pyridazine (pydz) bridged {[Pt(en)Cl]2(μ-pydz)}2+ complex were prepared. The ...
Tópico(s): Ferrocene Chemistry and Applications
2014 - American Chemical Society | Journal of Medicinal Chemistry
Dušica Stojanović, Milorad Zrilić, Radmila Jančić Heinemann, Irena Živković, Aleksandar Kojović, Petar S. Uskoković, Radoslav Aleksić,
New forms of hybrid multiaxial nanocomposites with enhanced mechanical and stab resisting properties are presented. This study is motivated by the lack of knowledge in the study of the multiaxial fabric nanocomposites with two modified thermoplastic matrices for antiballistic protection. Introduction of 5 wt.% silica nanoparticles in the composite of polyurethane/ p ‐aramid/poly (vinyl butyral) leads to significant improvement in mechanical properties, and the addition of silane as a coupling agents ...
Tópico(s): Fiber-reinforced polymer composites
2013 - Wiley | Polymers for Advanced Technologies
Ljiljana Markovic‐Denic, Kristina Živković, Aleksandar Lešić, Vesna Bumbaširević, Emilija Dubljanin-Raspopović, Marko Bumbaširević,
Venous thromboembolism (VTE) is a common complication of orthopaedic surgery in the industrialised world; though there may be variability between population groups. This study aims to define the incidence and risk factors for symptomatic VTE following primary elective total hip and knee arthoplasty surgery in a single centre in Eastern Europe. This prospective study included 499 adult patients undergoing total hip and knee arthroplasty for symptomatic osteoarthritis over a two-year period at the ...
Tópico(s): Acute Myocardial Infarction Research
2012 - Springer Science+Business Media | International Orthopaedics
Jovanka Gašić, Jelena Popović, Slavoljub Živković, Aleksandar Petrović, Radomir Barac, Marija Nikolić,
Abstract To determine whether sodium hypochlorite (NaOCl) with 0.2% chlorhexidine gluconate (CHX) leads to colour change and precipitate formation, and to ultrastructurally analyse the dentine surface after simultaneous irrigation with 0.5% NaOCl and 0.2% CHX. Four tubes in which 5ml of different NaOCl concentrations and 5ml 0,2% CHX were placed, were observed every 15 minutes in the first two hours and after 7 days. Mixture solutions were centrifuged at 800 rpm/4 min. A precipitate is observed under ...
Tópico(s): Dental Radiography and Imaging
2012 - Wiley | Microscopy Research and Technique
Biljana M. Damjanovic, Žika Lepojević, Vladimir Živković, Aleksandar Tolić,
Ground fennel (Foeniculum vulgare Mill.) seeds, growing wild in Montenegro, were extracted with supercritical CO2 (SC-CO2) at a flow rate of 0.2 kg CO2/h under varying extraction conditions in order to determine yield, composition and organoleptic characteristics of extract. The extracts obtained were compared to fennel seed oil isolated by hydrodistillation. In the SC-CO2, extracts as well in the hydrodistilled oil, the major compounds were trans-anethole (68.6–75.0%) and (62.0%), methylchavicol (5. ...
Tópico(s): Subcritical and Supercritical Water Processes
2004 - Elsevier BV | Food Chemistry
Zdenka Zivkovic, Aleksandar Marković,
Applying the linear model of the high--power HF triode, the conditions of the optimal design are analyzed in the paper, proposing the injection of the second harmonic in the input and output circuits. The optimal content of the second harmonic is investigated assuming an equal injection of the second harmonic in the input and the output circuits. The results are compared to the similar results of the linear amplifier under the same conditions but without any injection and also with the amplifier ...
Tópico(s): Particle accelerators and beam dynamics
1986 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Broadcasting
Zdenka Zivkovic, Aleksandar Marković,
The paper deals with the influence of the third harmonic injection into the grid and anode qirclits of a tuned high power amplifier, in order to improve the efficiency. The linear triode model is used, enabling avaluation of all power balance important parameters in a closed form. The results obtained are compared with the performances of the same amplifiers, without injection.
Tópico(s): Advanced DC-DC Converters
1985 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Broadcasting
Miodrag Živković, Aleksandar Petrović, Nebojša Bačanin, Marko Djuric, Ana Vesić, Ivana Strumberger, Marina Marjanović,
Spam emails pose a significant threat to end users, annoying them and wasting their time. To counter this problem, numerous spam detection systems have been proposed recently, where the most of the solutions have grounds in the machine learning algorithms, due to their efficiency in classification tasks. Unfortunately, existing spam detection solutions typically face low detection rate and generally have troubles in dealing with high-dimensional data. To address this problem, this paper suggests ...
Tópico(s): Data Stream Mining Techniques
2023 - Springer International Publishing | Lecture notes in networks and systems
Avinash Rokade, Ganesh K. Rahane, Aleksandar Živković, Swati Rahane, Hemant S. Tarkas, K. Hareesh, Nora H. de Leeuw, Shrikrishna D. Sartale, Nelson Y. Dzade, Sandesh Jadkar, Sachin R. Rondiya,
CdS, characterized by its comparatively narrow energy band gap (∼2.4 eV), is an appropriate material for prospective use as a photoanode in photoelectrochemical water splitting. Regrettably, it encounters several obstacles for practical and large-scale applications, including issues such as bulk carrier recombination and diminished conductivity. Here, we have tried to address these challenges by fabricating a novel photoelectrode (ZnO/CdS) composed of one-dimensional ZnO nanorods (NRs) decorated with ...
Tópico(s): Copper-based nanomaterials and applications
2024 - American Chemical Society | Langmuir
Miloš Petrović, Pedja Mihailović, Ljiljana Brajović, Slobodan Petričević, Irena Živković, Aleksandar Kojović, Vesna Radojević,
In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function ...
Tópico(s): Analytical Chemistry and Sensors
2016 - IEEE Sensors Council | IEEE Sensors Journal
Mateja Budetić, Mirela Samardžić, Karlo Bubnjar, Andrea Dandić, Pavo Živković, Aleksandar Széchenyi, L. L. Kiss,
A new sensor for direct potentiometric determination of thiabendazole (TBZ) was prepared. The ionic pair of TBZ cation and the 5-sulfosalicylate anion was used as the new sensor material incorporated in liquid type of ion-selective electrode membrane for TBZ determination. For optimization of the membrane of the sensor for TBZ determination, six different plasticizers and the content of the sensor material in the membrane were varied. The chosen sensor with dibutyl sebacate (DS) as plasticizer and ...
Tópico(s): Electrochemical sensors and biosensors
2022 - Elsevier BV | Food Chemistry
Neda Đorđević, Miroslav Novaković, Boris Pejin, Marijana Živković, Aleksandar Savić, Jelena Mutić, Vele Tešević,
This study aimed to describe quality and potential health benefits of three Vranac wines obtained from new grape clones (CI, CII and CIII) recently developed and recognised. In this aim, their phenolic profiles, anti-2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical activities along with metal compositions were analyzed. Compared with the commercial one, CII and CIII Vranac wines were found to contain both higher contents of total phenolics, flavonoids and monomeric anthocyanins as well as anti-DPPH radical ...
Tópico(s): Heavy Metals in Plants
2017 - Elsevier BV | Scientia Horticulturae
Milica Živković, Aleksandar Keković, Slaviša Kondić,
In the era of progressive technological and social development, housing environment should respond to actual demands of modern society, with the idea of flexibility and adaptability as the key parameters of sustainable living. Application of the flexible elements in the interior provides a variety of spatial interpretations of the residential unit that can be determined by an architect or by users, depending on the applied design concept. The degree of achieved spatial flexibility will depend on ...
Tópico(s): Urbanization and City Planning
2014 - | Facta universitatis - series Architecture and Civil Engineering
Theopolina Amakali, Aleksandar Živković, Michael E. A. Warwick, Daniel R. Jones, Charles W. Dunnill, Likius S. Daniel, Veikko Uahengo, Claire E. T. Mitchell, Nelson Y. Dzade, Nora H. de Leeuw,
Metal sulphides, including zinc sulphide (ZnS), are semiconductor photocatalysts that have been investigated for the photocatalytic degradation of organic pollutants as well as their activity during the hydrogen evolution reaction and water splitting. However, devising ZnS photocatalysts with a high overall quantum efficiency has been a challenge due to the rapid recombination rates of charge carriers. Various strategies, including the control of size and morphology of ZnS nanoparticles, have been ...
Tópico(s): Quantum Dots Synthesis And Properties
2022 - Frontiers Media | Frontiers in Chemistry
Aleksandar Košarac, Róbert Čep, Miroslav Trochta, Miloš Knežev, Aleksandar Živković, Cvijetin Mladjenovic, Aco Antić,
This paper presents the development and evaluation of neural network models using a small input-output dataset to predict the thermal behavior of a high-speed motorized spindles. Different neural multi-output regression models were developed and evaluated using Keras, one of the most popular deep learning frameworks at the moment. ANN was developed and evaluated considering the following: the influence of the topology (number of hidden layers and neurons within), the learning parameter, and validation ...
Tópico(s): Advanced Numerical Analysis Techniques
2022 - Multidisciplinary Digital Publishing Institute | Materials
Aleksandar Živković, Nora H. de Leeuw,
CuO (cupric oxide) is a well-known $p$-type semiconductor, suitable for solar cell photovoltaic applications. However, due to the easy formation of defects and Cu-rich layers at the copper(II) oxide heterointerface, commercial application is yet to be successfully implemented. Density functional theory calculations have been employed to study the formation of intrinsic defects and their effect on the electronic properties of CuO. Native impurities were observed, depending on the synthesis conditions, ...
Tópico(s): Electronic and Structural Properties of Oxides
2020 - American Physical Society | Physical Review Materials
Aleksandar Živković, Alberto Roldán, Nora H. de Leeuw,
Most photovoltaic absorbers are identified using the standard Shockley-Queisser selection principle which relies on optimal band-gap values. However, this criterion has been shown to be insufficient, as many materials with appropriate values still perform badly. Here, we have employed calculations based on the density functional theory to assess three copper oxides as potential photovoltaic materials: ${\mathrm{Cu}}_{2}\mathrm{O}$, ${\mathrm{Cu}}_{4}{\mathrm{O}}_{3}$, and $\mathrm{CuO}$. Despite their promising ...
Tópico(s): Quantum Dots Synthesis And Properties
2019 - American Physical Society | Physical review. B./Physical review. B
Aleksandar Živković, Alberto Roldán, Nora H. de Leeuw,
${\mathrm{Cu}}_{2}\mathrm{O}$ is a widely known $p$-type semiconductor with a band-gap value suitable for photovoltaic applications. However, due to its parity-forbidden nature of the first interband transition and high carrier recombination currents, ${\mathrm{Cu}}_{2}\mathrm{O}$ has failed to reach commercial application. Hybrid density functional theory has been used to study the effect of transition metal dopants on the electronic and optical properties of ${\mathrm{Cu}}_{2}\mathrm{O}$. Substitutional ...
Tópico(s): Electronic and Structural Properties of Oxides
2019 - American Physical Society | Physical Review Materials
Wei Wang, Jiapin Chen, Aleksandar Živković, Huikai Xie,
A Fourier transform spectrometer (FTS) that incorporates a closed-loop controlled, electrothermally actuated microelectromechanical systems (MEMS) micromirror is proposed and experimentally verified. The scan range and the tilting angle of the mirror plate are the two critical parameters for MEMS-based FTS. In this work, the MEMS mirror with a footprint of 4.3 mm × 3.1 mm is based on a modified lateral-shift-free (LSF) bimorph actuator design with large piston and reduced tilting. Combined with a position- ...
Tópico(s): Acoustic Wave Resonator Technologies
2016 - Multidisciplinary Digital Publishing Institute | Sensors
Wei Wang, Jiapin Chen, Aleksandar Živković, Quentin A. A. Tanguy, Huikai Xie,
This paper reports a compact Fourier transform spectrometer system with a large-stroke electrothermal microelectromechanical systems (MEMS) mirror and other optical components all integrated on a micromachined silicon optical bench with the footprint of 2 cm × 2 cm. The linear optical path difference (OPD) scan range generated by the MEMS mirror reaches up to 450 μm, and the tilting of the mirror plate is reduced down to <;±0.002° by using a new openloop control method. A spectral resolution of 40 cm -1 , ...
Tópico(s): Advanced MEMS and NEMS Technologies
2016 - Institute of Electrical and Electronics Engineers | Journal of Microelectromechanical Systems
Aleksandar Živković, Milan Zeljković, Slobodan Tabaković, Zoran Milojević,
Tópico(s): Gear and Bearing Dynamics Analysis
2014 - Springer Science+Business Media | The International Journal of Advanced Manufacturing Technology
Igor Radisavljević, Aleksandar Živković, Vencislav Grabulov, Nenad Radović,
The aim of this work was to investigate the combined effect of small difference in pin geometry, together with rotation and welding speed on the weldability, mechanical and structural properties of FSW 2024-T351 Al plates. The only difference in tool pin design was the shape of thread: regular and rounded. Specimens were welded using rotation rate of 750 rev/min and welding speeds of 73 and 93 mm/min. In all four cases, specimens were defect free, with good or acceptable weld surface. Modification ...
Tópico(s): Welding Techniques and Residual Stresses
2014 - Association of Chemical Engineers of Serbia | Hemijska industrija
Igor Radisavljević, Aleksandar Živković, Nenad Radović, Vencislav Grabulov,
The influence of R/v ratio on joint quality in 2024-T351 aluminum alloy was studied. Specimens were subjected to friction stir welding with the rotation rates of 750, 950 and 1180 r/min and welding speed between 73 and 190 mm/min, providing R/v ratio between 5.00 and 10.27. The welded joints were tested by means of both non-destructive (visual, penetrant and X-ray inspection) and destructive (metallographic, tension and hardness) testing. In all specimens typical zones are revealed, with corresponding ...
Tópico(s): Aluminum Alloys Composites Properties
2013 - Elsevier BV | Transactions of Nonferrous Metals Society of China
Slobodan Tabaković, Milan Zeljković, R. Gatalo, Aleksandar Živković,
In the development of robots and machine tools, in addition to conventional and serial structures, parallel mechanism-based kinematic structures have been used over a longer period of time. Aside from a number of advantages, the irregular shape and relatively small dimensions of the workspace formed by parallel mechanisms rank among the major weaknesses of their application. Accordingly, this fact has to be taken into consideration in the process of designing parallel mechanism-based robots or machine ...
Tópico(s): Advanced Measurement and Metrology Techniques
2013 - SAGE Publishing | International Journal of Advanced Robotic Systems
Ivana Ivanović, Aleksandar Sedmak, Marko Miloš, Aleksandar Živković, Mirjana Lazić,
A numerical study of transient three-dimensional heat conduction problem with a moving source is presented. For numerical solution Douglas-Gunn alternating direction implicit method is applied and for the moving heat source flux distribution Gaussian function is used. An influence on numerical solution of input parameters figuring in flux boundary conditions is examined. This include parameters appearing in Gaussian function and heat transfer coefficient from free convection boundaries. Sensitivity ...
Tópico(s): Aerodynamics and Fluid Dynamics Research
2011 - Vinča Institute of Nuclear Sciences | Thermal Science
... 10.1016/j.ecolind.2018.03.009Ivana Pajač Živković, Darija Lemic, Aleksandar Mešić, Božena Barić, Rodrigo Órdenes, Hugo A. Benítez ...
Tópico(s): Morphological variations and asymmetry
1998 - University of Chicago Press | The American Naturalist