Irina Mladenoska1,, Elena Tancheva2
1 PhD, Professor (Full) at Faculty of Technology and Metallurgy, University Ss. Cyril and Methodius in Skopje 1
2 Bachelor's degree graduate from the Faculty of Technology and Metallurgy, University Ss. Cyril and Methodius in Skopje2
e-mail: irina@tmf.ukim.edu.mk
Apstract
This thesis investigates and examines the impact of current edible coatings...
İznik Lake, located in the Marmara Region of Türkiye, holds significant ecological, historical, and socio-economic importance. Therefore, preservation of İznik Lake is vital for maintaining ecological balance, cultural heritage, and economic stability in the region. Despite the mentioned importances, İznik Lake is subject to significant pollution from surrounding anthropogenic activities. This...
Geranium species (Geraniaceae), commonly known as cranesbills, are flowering annual to perennial plants that are common throughout temperate regions and used as popular folk remedies. In Serbia, G. macrorrhizum L., commonly known as “Zdravac”, is a widely used medicinal plant. The rhizome and aerial parts have been used since antiquity for medicinal purposes to treat diarrhea, and externally...
Given that black pepper (Piper nigrum L.) essential oil generally exhibits weak to moderate antioxidant activity [1], this study aimed to investigate the effects of a modified Clevenger hydrodistillation (MCHD) method on enhancing antioxidant activity and using hydrolates as valuable byproducts. The MCHD method involves reusing a portion of the aqueous phase of suspension (hydrolate) from...
There is a constant need to improve medicinal forms both in terms of pharmaceutical and technological characteristics and in terms of efficacy. Hydrogels are among the most studied dosage forms when it comes to wound healing, due to their favorable technological characteristics, controlled release at the site of application and the possibility of incorporating various medicinal substances. In...
APPLICATION OF EDIBLE COATINGS ON FRESH-CUT CELERY
Irina Mladenoska1,, Maja Kochoska2
1 PhD, Professor (Full) at Saints Cyril and Methodius University of Skopje 1
2 Bachelor's degree graduate from the Faculty of Technology and Metallurgy, University Ss. Cyril and Methodius in Skopje 2
e-mail: irina@tmf.ukim.edu.mk
ABSTRACT
In this project, we studied the effects of edible coatings...
Due to their lentic and enclosed nature, lakes are more susceptible to organic pollution and eutrophication. İznik Lake, which is an ideal place for various recreational activities such as fishing, swimming and water sports, is the largest natural stagnant water ecosystem in the Marmara Region and has a rich biodiversity. Despite its natural beauty and importances, İznik Lake is exposed to...
Formulation of compounds
with Brij S100 and PEG 4000 using the PGSSTM process
The main goal in this paper is the production and characterization of conductive nanocomposites with PMMA – Poly (methyl methacrylate) matrix reinforced with graphene, MWCNTs (multi-walled carbon nanotubes) and a hybrid mixture of graphene, MWCNTs, and fullerenes. The nanocomposites were produced as thin films. The thin films are prepared using the solvent casting method. Carbon nanostructures...
Cold-active enzymes are produced by organisms that inhibit environments such as polar regions, ocean depths, and high altitudes where temperature is low throughout the year. Typically, such biocatalysts not only exhibit their highest activity below 25ºC [1], but are also heat sensitive – making them ideal for applications that require mild processing conditions. Consequently, cold-active...
Abstract
Construction and demolition waste is composed of concrete, mortar, bricks, ceramics, metal and glasses. Glasses are produced at higher temperature of 1500 oC. In 2018, 130 mililion tons of glass wastes were generated worldwide. The glass recycling can reduce the CO2 emission by up to 37%. The recycling of waste glass and metal powder into new materials is environmentally beneficial...
This paper examines the impact of chemical composition and hot rolling process parameters on the strength characteristics of low-carbon manganese steel plates with final thicknesses of 60 and 50 mm. A review of existing mathematical models was conducted to establish the influence of these factors. The model by J. Noppon and S. Chandra-Ambhorn was selected due to the similarity of variables and...
In the sintering plant in R.Ž “Topilnica” j.s.c Skopje the gas cleaning system has been reconstructed and readapted. The gas cleaning is performed in electro static filter, mechanical filter and also dry scrubbers as well. The differential method is used for cleaning hot and cold gases from the sinter machine and has been used and ambient air from the whole plant as well.
The mini sintering...
DETERMINATION OF THE FULLY OXIDIZED OIL CONTENT USING FTIR SPECTROSCOPY AND MULTIVARIATE CALIBRATION
Fatos Rexhepi1,*, Artan Gashi2
1 Faculty of Food Technology, University “Isa Boletini” Mitrovica Str. Ukshin Kovaqica N.N. 40000, Mitrovica, Republic of Kosovo
2 Faculty of Biotechnical Sciences, St. Kliment Ohridski University, Partizanska bb 7000, Bitola, Republic of North...
The demand for new wound dressings is rising to overcome the limitations of traditional treatments. Hydrogels, known for their low toxicity, biocompatibility, and wound-healing properties, have emerged as promising candidates, while grape skins offer a valuable source of bioactive compounds for incorporation into such vehicle. Therefore, we aimed to formulate grape skin extract-based hydrogels...
Abstract: High energy consumption and, at the same time, the depletion of fossil fuels have directed the focus of scientific interest toward alternative energy sources of renewable origins. Technologies introduced to reduce emissions of toxic and greenhouse gases, considered “clean” energy resources, include processes based on wind power, water flow, solar radiation, and geothermal solutions....
This presentation addresses the combined strength of economic incentives and public education in obtaining sustainable carbon emission reductions. The research examines the effect of financial development, industrial performance, and trade on CO2 emissions for EU and non-EU nations using strong empirical evidence analysis and theoretical models. The necessity to have well-thought-out economic...
In recent years, the perovskite solar cells (PSC) have get much attention as the most promising candidates to became the primary source of renewable energy. Over the last few years the efficiency of PSC has surpassed 25%. However, the commercial potential of PSCs is still mainly limited by the low stability of perovskite active/absorbing layer to the environmental influence. It has been shown...
Tomatoes are among the most widely produced fruits globally, with an estimated annual production of approximately 190 million metric tons. While they are commonly consumed fresh, the majority are processed into products such as tomato juice, ketchup, purée, and sauce. These processing methods generate significant amounts of by-products, the most notable being tomato pomace. Tomato pomace is...
Compared to classical analytical methods used for detection of water pollutants, electrochemical sensors have a number of advantages such as sensitivity, selectivity, and repeatability. The detection of commonly used drugs, such as diclofenac and doxorubicin, is important because they are often present as pollutants in water. The aim of this study is to demonstrate that a screen printed...
The detection of pharmaceutical contaminants in aquatic environments, including wastewater and natural water bodies such as rivers, lakes, and seas, is essential for safeguarding environmental health and ensuring water quality. Pharmaceuticals, often incompletely metabolized by humans and animals, persist in the environment and pose risks to ecosystems due to their bioactivity and potential...
This paper investigates the synthesis and characterization of potential catalysts for oxygen evolution reactions (OER) using Ce, Y, Yb, Pr, Dy and Nd rare earth elements (REEs) in combination with transition metals Co and Mn. Multivalent oxides were synthesized via ultrasonic spray pyrolysis (USP) in a single-step process, utilizing metal salt precursors. Structural and morphological analyses...
This study investigates the degradation of FAPbI₃ perovskite under environmental stressors, including UV exposure, moisture, and temperature, and explores the potential of two polyionic liquids (PILs) know by Poly(lithium bis(trifluoromethanesulfonyl)imide) (PolyLiTFSI) and 1-Butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (PolyImidazoliumTFSI) to enhance its stability. FAPbI₃, a...
The wine industry generates large quantities of grape waste, such as skins, stems, and seeds. Its composition, rich in phenolic substances, oils, and proteins, is highly valuable for obtaining various bioproducts.
In this study, the grape waste (skin and seeds with 1 mm particle size) from a winery in the Republic of North Macedonia was extracted with subcritical Freon R134a...
GaAs or GaN MOS-HEMT can indeed provide better performance than traditional Si-based MOSFET in suppressing leakage current and improving breakdown voltage, especially in high-frequency and high-power applications, which has significant advantages. These characteristics are very beneficial for IC power management, especially in terms of improving efficiency and reducing power consumption. In...
This study investigates the selective recovery of critical metals from coal through chemical leaching and electrochemical processes, with a focus on copper (Cu) recovery. Chemical leaching was performed using 15 vol.% HNO₃ at 60°C for 30 minutes per cycle. After each leaching step, a new coal sample was introduced, while the used acid was replenished with concentrated HNO₃ to maintain a...
There is a growing demand for cultural heritage conservation systems that also meet ambitious environmental sustainability targets. In this context, the evolution of the controlled release of anticorrosive agents for metal substrates from mesoporous silica nanoparticles (MSN) have been recently explored1. The main advantage of this approach from the environment point of view consists of the...
Green synthesis is a biological method for nanoparticles obtaining. As an environmentally friendly method, it does not require expensive, toxic, and harmful chemicals. For this reason, plant extracts are used as reducing agents to metal nanoparticles formation. Several plant biomolecules play a major role in the metals’ reduction acting as capping agents. Various parts of plants, such as...
The use of inorganic industrial wastes as alternative raw materials in the silicate industry is not a new idea. For examples: the first publication on the addition of metallurgical slag to "terracotta" was published in the Journal of the American Ceramic Society in 1918; slag-sitalls was developed in the former Soviet Union in 1958, i.e. only few years after the discovery of glass-ceramics....
Food waste is a serious global issue that is prompting researchers to search for alternative ways to its reduction and reutilization. Among the potential alternatives is the valorization of food processing industry by-products as sustainable packaging materials. This study addresses the use of blueberry and cabbage pomace and extract in intelligent chitosan-based biopolymer films. By utilizing...
The work focuses on the development of biorefining technology from agricultural waste to produce simple sugars, organic compounds and second-generation biofuels. The necessity of such investigations lies in the constantly increasing expectations for replacement of fuels and chemical compounds originating from crude oil as well as to avoid utilization of agricultural crops to obtain food....
Solar energy is one of the most promising renewable energy options among those available for achieving a considerable amount of energy - saving and carbon emission reduction and for the replacing fossil fuels because can created electrical energy and heat without polluting the earth. For the first time in the 2015 year the optical properties of black zirconia are investigated for the solar...
This master’s thesis covers the basics of Lean and Six Sigma methodology application in the metal processing industry, with a focus on the implementation level in Macedonia and a review of successful examples from Europe. Lean and Six Sigma methodologies, valued for enhancing efficiency and minimizing waste, hold particular importance for the metal processing sector. The thesis analyzes...
The automotive industry has made a huge contribution to the global economy. Automotive companies constantly look for ways to optimize processes and reduce costs to remain competitive in the global market. Lean Six Sigma is a methodology that combines Lean principles focused on eliminating waste and Six Sigma as an approach that seeks to reduce variations and errors in the production process....
The Republic of North Macedonia first introduced a separate regulation on packaging and packaging waste management in 2010, and in 2021 adopted a new law that is aligned with the new EU regulations on packaging and packaging waste management.
This Law regulates the requirements for the protection of the environment and human health that packaging must meet during production, placing on the...
Biomass stands out as a plentiful renewable energy resource. The development of biomass refineries can play a crucial role in advancing cost-effective and sustainable energy solutions. Pyrolysis, a thermochemical method, converts organic materials derived from biomass into valuable products. Usually, pyrolysis is conducted in the presence of a catalyst and always in an oxygen-free atmosphere....
Plum fruit (Prunus domestica L.) consists of a mesocarp surrounding a shell of hardened endocarp called pit with a seed kernel inside. The mesocarp as an edible part is used fresh or processed in various plum products, while the separated seeds from plum fruit are discarded without further utilization.
In this study, the pit and seed kernel separated from plums sourced from Berovo (Republic...
The monitoring of atmospheric and industrial gases is a pressing issue due to its implications for environmental pollution, industrial emissions, and process efficiency. Gas sensors are widely used in various applications to address these issues, and the development of innovative devices based on screen-printed electrodes (SPEs) has marked a significant advancement in the field. Developing...
Abstract
The lead acid batteries are ones of the oldest and the most widely used type of battery technologies in the world. They are still used in the automotive industries and energy storage systems. The recycling of spent electrodes of the car battery is of major concern due to the importance of minimizing the negative effect on the environment and the secondary resources obtained from the...
Green photocatalysis focuses on developing processes to address various environmental challenges, such as the treatment of contaminated water and air, the generation of renewable energy, biomass management, carbon monoxide oxidation, and organic synthesis. TiO2 nanoparticles are relatively inexpensive, non-toxic, and chemically stable. They are available in diverse structural forms and exhibit...
The research concerns the high amounts of fuel used in the rotary kiln process at the Ferronikeli plant in Drenas.
III-V compound semiconductors, known for their high electron mobility and superior frequency response, can significantly contribute to green energy applications through advanced high-speed electronic devices. These materials, such as InP and GaN, enable the development of efficient power electronics, including inverters and converters, which are critical for renewable energy systems like solar...
In this study, bioactive compounds from strawberry pomace, a by-product of the local fruit juice industry, were extracted using ultrasound-assisted extraction under varying experimental conditions: extraction time (5, 25, or 45 min), ethanol concentration (20, 50, or 80 %), and liquid-to-pomace ratio (5, 25, or 45 mL/g). The extraction process was optimized based on the total phenolic content...
In the face of growing global environmental concerns and the urgent need for sustainable material methods, the use of bio-composites has emerged as a promising solution. Bio-composites, which integrate natural fibers or agriculture wastes, offer several advantages, such as easy disposal, fewer health hazards, and reduced energy consumption during manufacturing. They also contribute to weight...
The "yellow cobblestones" of Sofia are a historic ceramic pavement, with which about 6 hectares of the central streets of the Bulgarian capital were covered in the period 1907-1908. Today the whole reserved space is two times smaller and many of yet existing “yellow bricks” are broken or cracked.
This high quality ceramic clinker is characterized with unusually good degree of sintering...
In the 21st century, when we are facing an energy crisis as one of the major global problems, the idea developed in 1972 by Fujishima and Honda about the hydrogen production by solar-driven photoelectrochemical (PEC) water splitting using semiconductor (TiO2) as a photoanode is more popular than ever. It is known that crystalline defects can have a great impact on optical and electrical...
One of the main sources of organic waste in the food processing industry is the meat sector. Various materials such as bones, fats, teeth, hair, skins, bacon fringes, and tallow are examples of the waste that remains. This type of waste has the potential to contaminate the environment and endanger human health. The ability to convert waste into energy could lead to new alternative fuels and...
