Faculty of Technology and Metallurgy

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Author: search.filters.author.Ana TomovaStart date: 2022

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    Voltammetric Detection of Diclofenac with Screen-printed Electrodes Based on Graphene and PVDF-Modified Graphene
    (The Croatian Society of Chemical Engineers – CSCE, 2024-07-15)
    Perica Paunovic
    ;
    Anita Grozdanov
    ;
    Iva Dimitrievska
    ;
    Ana Tomova
    In recent years, the detection and determination of numerous drugs and pharmaceuticals in various media have become crucial aspects of modern healthcare and environmental management. Among the available sensing techniques, electrochemical methods, particularly those utilising screen-printed electrodes (SPEs) and different portable equipment have emerged as rapid, effective, sensitive, and inexpensive. This study focuses on the detection of the anti-inflammatory drug diclofenac in neutral media. Cyclic voltammetry measurements were conducted to identify diclofenac and determine the kinetics and electrochemical mechanism of its oxidation, along with assessing the surface characteristics of the employed SPEs. Graphene and modified graphene SPEs were explored as nanosensors for this purpose. The surface of the graphene SPE was modified using polyvinylidene fluoride, applied through a drop modification procedure. The morphology of the examined SPEs was observed by means of scanning electron microscope, while the electrolyte (0.1 g of diclofenac per litre of phosphate-buffered solution, pH = 7.4) was analysed using UV-Vis spectroscopy. The results indicate that the studied SPEs exhibit promising potential for the detection of diclofenac.
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    DETERMINATION OF WORKING STYLES OF STUDENTS OF TECHNOLOGY AT THE FACULTY OF TECHNOLOGY AND METALLURGY IN SKOPJE IN RELATION TO CURRICULUM CHOICE
    (KNOWLEDGE – International Journal, 2023)
    Ana Tomova
    ;
    null, null
    ;
    Beti Andonovic
    ;
    Kiril Lisickov
    ;
    Aleksandar Dimitrov
    The purpose of this paper is to examine the benefits and drawbacks of Working Styles in a broad sense, with a focus on identifying and interpreting the dominant Working Styles among students of technology in various curricula at The Faculty of Technology and Metallurgy in Skopje. This research included Julie Hay's questionnaire to determine students’ Working Styles. The objective was to identify characteristics that are reflected through specific Working Styles and their combination, representing a distinct pattern of expected behaviors, known as the script pattern. These findings were summarized for each group of students of technology in five different curricula and subjected to a detailed analysis. The advantages and disadvantages of the identified Working Styles were determined, and essential steps to enhance the benefits and minimize the drawbacks were outlined. Additionally, recommendations were provided to motivate students to further utilize their potential. The study established a connection between the demonstrated Working Styles of student groups and their choice of curriculum. The intention of this research is to contribute to the improvement of curricula and teaching methods, ultimately benefiting current and future students.
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    Nano-structured Electrode Materials with Reduced Amount of Platinum Aimed for Hydro gen Evolution. Part I: Effect of cobalt
    (INTERNATIONAL SCIENTIFIC JOURNAL "INDUSTRY 4.0", 2023)
    Perica Paunovic
    ;
    null,null
    ;
    Ana Tomova
    The subject of this study is electrochemical and structural characterization of nano-dimenzioned composite electrode materials for hydrogen evolution consisted of Co, Pt or CoPt metallic phase and TiO2, both grafted on multiwalled carbon nanotubes (MWCNTs) as a support material. The main idea was to replace platinum entirely or to some extent as an electrode material. The electrode materials with different The common composition of the studied electrode materials was 10%Me + 18%TiO2 + MWCNTs, where Me = Pt, CoPt (1:1, wt.), CoPt (4:1, wt.) and Pt. The structural and surface changes, as well as their influence on electrocatalytic activity were analyzed by means of XRD, TEM, SEM and FTIR. It was found that Co considerably reduces Pt particle size, from 11 nm (in pure Pt metallic system) to 3–4 nm (in mixed CoPt systems). This is a reason for better activity of the electrode material with CoPt (1:1) metallic phase than that with pure Pt, while the CoPt (4:1) with very low quantity of Pt approaches the acitivity of the electrode material with pure Pt.
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    Nano-structured Electrode Materials with Reduced Amount of Platinum Aimed for Hydro gen Evolution. Part II: Effect of MWCNTs modification
    (INTERNATIONAL SCIENTIFIC JOURNAL "INDUSTRY 4.0", 2023)
    Ana Tomova
    ;
    null, null
    ;
    Perica Paunovic
    Direct Metal Laser Sintering (DMLS) is a revolutionary technology that allows a production of fully functional metal parts directly from a 3D CAD data, eliminating the investment to production tools and technologies which brings considerable cost and time savings. Metal parts made by DMLS technology are fully comparable with casted or machined parts. A range of application of DMLS technologies is very wide – from prototypes, through short-run production to final products. Advantages of DMLS technology are arising along with com plexity of parts – more complex geometry of parts (in terms of shape and occurrence of the detail) make DMLS technology even more eco nomically effective.
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    Framework for Establishing an Effective Management Team within Organizations
    (Association for Advancing Innovation and Research in Economy "Irenet", 2024-11-13)
    Ana Tomova
    ;
    null, null
    ;
    Beti Andonovic
    ;
    Aleksandar Dimitrov
    ;
    null, null
    This paper presents contemporary concepts, characteristics, and managerial strategies tailored for the demands of the new century. It delves into the significance of competitiveness and the implementation of effective management practices, emphasizing the pivotal role of knowledge management, organizational culture, and environmental analysis. The central focus lies in explaining the fundamental traits of a modern manager, highlighting the imperative for proactive improvement within the company. The subject of this paper is to evaluate the adoption of contemporary management principles by corporate management teams. The study examines the merits, drawbacks, and obstacles faced by these teams through surveys, aiming to optimize management teams. The research employs the Julie Hay's Working styles Questionnaire to predict Role distribution within working teams, offering a strategic advantage over empirical allocation. Furthermore, it utilizes the Adizes' Questionnaire to assess the development of key characteristics essential for effective decision-making within organizations. Surveys were conducted in two Macedonian companies following international research standards. Statistical analysis was conducted on the Questionnaire responses, offering not only a comprehensive evaluation and comparison of management team success across the surveyed companies, but also recommendations for improvements within the companies.