Faculty of Mechanical Engineering

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Author: search.filters.author.Domazetovska Simona

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    Statistical Analysis of Urban Noise Measurements Data: Case Study for the City of Skopje
    (EuroRegio, 2022)
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    Nikolovski, Filip
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    Noise from the road transport, particularly from vehicles in urban city areas largely accounts for the general noise level and annoyance of the citizens. The numerous volumes of motor vehicles flow can be treated statistically, which can establish a deeper insight into the contribution of the road noise to the prevalent noise pollution and its' characteristics. According to ISO 362 and ISO 1996:2, the environmental noise level from traffic is highly dependent on the vehicle category regarding the factor of contribution to the overall urban noise level. The purpose of this study is to analyze the dependence between the number and types of vehicles and measured standardized parameters (Leq, LAF and L95) for noise level assessment by implementing a statistical model analysis ofthe collected results. The number and the type of the vehicles is obtained from the States' traffic management and control center for a chosen road in the center of the city, whereas noise level measurements have been conducted with a Bruel&Kjaer sound level meter by using a standardized noise level measurement methodology procedure for the selected period on the given location. This study provides a detailed statistical approach of the collected noise and traffic volume data to obtain conclusions and prediction models for further management of the noise pollution problem in the city.
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    Exploring the Potential of Biomass Pyrolysis for Renewable and Sustainable Energy Production: A Comparative Study of Corn Cob, Vine Rod, and Sunflower
    (Sustainability, MDPI, 2023-09-11)
    Domazetovska Simona
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    Vladimir Strezov
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    Risto V. Filkoski
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    Tao Kan
    The paper investigates the potential of biomass pyrolysis as a sustainable and renewable energy solution. The study focuses on three biomass types: corn cob, vine rod, and sunflower, which are abundant agricultural residues with potential for biofuel production. The pyrolytic gas, oil, and char produced during pyrolysis at a heating rate of 10 C/min were analyzed. At the pyrolysis temperature of 500 C, the corn cob showed the smallest final residual mass of 24%, while the vine rod exhibited the largest mass loss of 40%. Gas analysis revealed the concentrations of CO2, CO, H2, and CH4 in the pyrolytic gas, indicating its energy potential. Sunflower presented the largest calorific value of the produced biogas, while corn cob was the lowest. The chemical composition of the bio-oils was determined, with aliphatic acids identified as the dominant compounds, suggestin their potential for biodiesel production. Fourier Transform–Infrared Spectroscopy (FT-IR) analysis of raw biomass and char products demonstrated varying extents of decomposition among the biomass samples. A multicriteria assessment approach was employed to evaluate the differences between the selected three biomass feedstock and determined that sunflower biomass ranked the highest among the three, although the overall difference was small, confirming the suitability of all three biomass samples for pyrolysis conversion to higher-value-added fuels.
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    Assessment of thermal processing behaviour of corn cob, vine rod and sunflower
    (University of Nis, 2017-10)
    Domazetovska Simona
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    Vladimir Strezov
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    Risto V. Filkoski
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    Tao Kan
    The efforts to achieve reduction in carbon emission, soaring prices of petroleum and concerns over secured energy supply are the major drivers in the search for alternative renewable energy sources. Typical and abundant biomass residues, such as corn cob, vine rod and sunflower, have potential to produce energy in carbon neutral way when subjected to pyrolysis conversion through biogas, bio-oils and bio-char products. The objective of this work was to assess the thermal behaviour of these three agricultural biomass materials under slow pyrolysis conditions, in order to quantify their energy potential. In that direction, a variety of technological tools were employed in the research. The thermo-gravimetric analyser was used on the raw samples to monitor the mass change and to determine the proximate analysis of the considered biomass samples, which is the basis for estimation of their calorific value. The raw samples and the char products of pyrolysis at 500˚C were analysed using Fourier transform-infrared (FT-IR) spectroscopy. The results indicate change in functional groups between raw and solid char products, which refers to the loss of organics after pyrolysis at 500˚C. The organic compounds contained in the pyrolysis oils at 500˚C were investigated using gas chromatography - mass spectrometry (GC-MS). The obtained data provide important reference information on the opportunities for energy and fuel generation from pyrolysis of the analysed biomass.