Faculty of Technology and Metallurgy

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Tailoring multipurpose capabilities of jute (Corchorus) with a focus on the cleaner production and “zero waste” concept
(Springer, 2025)
Aleksandra Ivanovska
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Marija Milošević
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Željko Mravik
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Zorica Svirčev
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Characterization of Al-Containing Industrial Residues in the ESEE Region Supporting Circular Economy and the EU Green Deal
(MDPI AG, 2024-12-20)
Fidanchevski, Emilija
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Šter, Katarina
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Mrak, Maruša
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Rajacic, Milica
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Koszo, Bence David
The increase in industrial waste generation presents a global problem that is a consequence of the needs of modern society. To achieve the goals of the EU Green Deal and to promote the concept of circular economy (CE), the valorization of industrial residues as secondary raw materials offers a pathway to economic, environmental, energetic, and social sustainability. In this respect, Al-containing industrial residues from alumina processing (red mud), thermal power plants (fly ash and bottom ash), and metallurgy (slag), as well as other industries, present a valuable mineral resource which can be considered as secondary raw materials (SRMs) with the potential to be used in construction, supporting the concept of circular economy. This paper focuses on the characterization of 19 secondary raw materials from the East South-East Europe (ESEE) region regarding their physical, chemical, mineralogical, and radiological characteristics. The goal is to provide a foundation for future innovations based on secondary raw materials, in alignment with the EU Green Deal and the principles of circular economy. The results showed that fly ash has the potential to be the best material among those analyzed to be used in the cement industry, mainly due to its favorable radiological and mineralogical properties. However, it is important to control the amount of free lime in the mixture, ensuring it remains below 10%. After evaluating secondary mineral raw materials for metal recovery, the results indicate that these materials are not viable sources for base metals or other technology-critical metals, such as REEs.
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A step towards tuning the jute fiber structure and properties by employing sodium periodate oxidation and coating with alginate
(Elsevier, 2024-02)
Aleksandra Ivanovska,
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Marija Milošević,
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Jelena Lađarević,
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Tamara Matić,
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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
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null, null
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Beti Andonovic
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Kiril Lisickov
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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
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null,null
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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
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null, null
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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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Water vapour permeability of nylon pantyhose
(Hemijska Industrija, 2023)
Tomovska, E., Hes, L. , Zafirova, K.
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The Effect of the Addition of Construction & Demolition Waste on the Properties of Clay-based Ceramics
(Science of Sintering; ISSN: 1820-7413 (online); 0350-820X (print); IF: 1.172 (2019); Published by association for ETRAN Society., 2022-08)
Biljana Angjusheva, Vilma Ducman , Emilija Fidanchevski
Waste glass and reclaimed brick are types of construction and demolition waste (C&DW) that could potentially be used as secondary raw materials in the production of ceramics. Ceramics based on clay, waste demolished brick (5-15 wt.%) and waste glass (5-20 wt.%) were produced by pressing (P = 68 MPa) and subsequently sintered at 900, 950, 1000, and 1050 o C for one hour. The physical and mechanical properties of the ceramics obtained were evaluated. The addition of demolished brick decreased the density and mechanical properties of the clay specimens and increased the water absorption. The incorporation of waste glass improved the sintering behavior and its mechanical properties. The addition of 20 wt.% waste glass and 10 wt.% waste demolished brick into the clay matrix improved the flexural strength by up to 20.6 % and decreased the water absorption by up to 22 %. The approach presented promotes an opportunity to recycle construction and demolition waste into alternative resource materials, and represents a positive contribution to the environment.
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Influence of architecture in clothing design
(Tekstilna industrija, 2023)
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Stevkovska-Stojanovska, Ruzica
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The effect of whey type on the yield and quality characteristics of Urda
(Croatian Dairy Union, 2022-06-27)
Chadikovski, Aleksandar
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null, null
<jats:p>In this research, whey cheese Urda was produced in industrial conditions by thermal denaturation, followed by protein aggregation and precipitation of whey which was obtained during production of white brined cheese and Kashkaval. The impact of milk pasteurization temperature, pH values, protein content, and whey type on the Urda quality and yield was examined. The impact of whey pH on Urda yield was evaluated in the pH range from 4.5 to 6.0. Urda yield reached a maximum pH value between 5.2 and 5.4. The highest Urda yield from white brined cheese whey was obtained at pasteurization temperature of 72 °C. By increasing the temperature to 80 °C, the whey protein content and the Urda yield decreased. Whey type had no significant impact on the sensory and textural characteristics of Urda. Urda was classified as a low-fat soft albumin cheese. Valorisation of whey generated after production of white brined cheese, and manufacturing of Urda with maximum yield and optimal functional properties, is not only of economic importance, but can be conducive to improve waste water quality.</jats:p>

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