Natural Resources and Technology

SECONDARY MINERALS IN THE ALLCHAR ORE DEPOSIT, N. MACEDONIA WITH PARTRICULAR REFERENCE TO SEM VIEW

Ivan Boev — 2024-05-27

A remarkably large association of secondary minerals appears in the Allchar deposit, which is presented in detail in this paper. This mineral association is represented by the following minerals:

Arsenolite, As2O3,Valentinite, Sb2O3, Cervantite Sb2O4, Goethite α-FeO(OH), Stibiconite, Sb3O6(OH),Roméite, (Ca,Fe2+,Mn,Na)2(Sb,Ti)2O6(O,OH,F), Gypsum CaSO4 x 2H2O, Starkeyite, MgSO4·4H2O, Rozenite, FeSO4·4H2O, Epsomite MgSO4 x7H2O, Melanterite, FeSO4·7H2O, Jarosite KFe3+3(SO4)2(OH)6, Dorallcharite, (Tl,K)2Fe3+6(SO4)4(OH)12, Fibroferrite, FeSO4(OH)·5H2O, Pharmacolite, CaHAsO4·2H2O, Picropharmacolite, Ca4Mg(AsO3OH)2(AsO4)2·11H2O, Hornesite, Mg3(AsO4)2·8H2O.

The paper shows microscopic photographs as well as photographs taken with a SEM microscope.

GHG EMISSIONS FROM MUNICIPAL SOLID WASTE IN NORTH MACEDONIA

Afrodita Zendelska — 2024-05-27

Emissions of greenhouse gases (GHG) from municipal solid waste (MSW) in North Macedonia are a serious issue for the environment and major efforts are needed to mitigate climate change. In order to determine the current situation with the GHG emissions in North Macedonia, several calculations were made and results and proposals for reduction of GHG emissions, related with waste, are presented in this paper.

Municipal solid waste (MSW) management, primarily through landfilling, is a major contributor to GHG emissions in North Macedonia. The anaerobic decomposition of organic waste in landfills generates methane (CH₄), a strong greenhouse gas with a high global warming potential, even 25 times more than carbon dioxide (CO₂). Furthermore, open waste burning and inadequate waste management techniques lead to the release of CO₂, nitrous oxide (N₂O) and other pollutants.

Despite efforts to mitigate GHG emissions from waste, challenges persist due to inadequate waste management infrastructure, limited waste reduction and recycling initiatives, and failure to implement regulatory frameworks. These challenges exacerbate the environmental impacts of waste management and hinder progress towards sustainable development goals.

To tackle GHG emissions from waste in North Macedonia, a comprehensive approach is required that includes legislative interventions, technological advances, and public engagement techniques. Improving waste management infrastructure, promoting waste reduction and recycling, investing in waste-derived renewable energy, and enhancing regulatory enforcement are among the key recommendations.

PHYTOREMEDIATION OF CONTAMINATED SOILS IN THE VACINITY OF PROBISHTIP, THE REPUBLIC OF NORTH MACEDONIA

Ivica Andov — 2024-05-27

Phytoremediation is one of the most suitable techniques for the remediation of heavy metals from polluted soils. The purpose of this paper is to determine the efficiency of several plants varieties for phytoremediation of soils contaminated with lead, iron and arsenic in the vicinity of the municipality of Probishtip.

The research was done in the period from May to September 2023. During this period, representative soil samples were taken from several locations in the vicinity of Probishtip. These samples were subjected to laboratory testing to determine the concentration of the elements that compose it. After receiving the results, certain types of plants are planted in the soil samples. Тhe same soil samples are subjected to laboratory testing again after a certain period of time, sufficient for the plants to have an impact on the soil.

The results of the soil analysis and risk assessment indicate the presence of heavy metal contamination in the soils surrounding Probishtip, especially in samples near Cranfield and the old tailings dump. The most frequently found metals include iron, lead, zinc, arsenic, copper, and chromium, all of which are the focus of our research. It can be inferred that the heavy metal content before planting the crops is higher than after planting, suggesting a process of soil remediation is underway.

SELECTION OF THE LOCATION OF THE MAIN WAREHOUSE USING THE EDAS METHOD

Stojance Mijalkovski — 2024-05-27

When solving problems related to capital investments in the company, it is necessary to work out the problem in detail and take into account as many influential parameters as possible in order to make the optimal decision. One such problem is the selection of the main warehouse location for the needs of a given company with dispersed centers. Multi-criteria decision-making methods can be applied to successfully solve such very complex problems.

In this paper, the EDAS method will be applied to achieve the optimal selection of the location of the main warehouse in a company with several dispersed centers.

ERGONOMIC WORKSTATION DESIGN IN AUTOMOTIVE CAR SEATS PRODUCTION

Irena Taseva — 2024-05-27

Musculoskeletal disorders are one of the most common work-related illnesses. At the European level, they affect the health of millions of workers, and at the same time, the employers themselves pay high costs for their compensation. According to data from the automotive industry, the costs of introducing ergonomic controls at the initial stage of production design are significantly lower than the costs of compensating musculoskeletal disorders. Along with the implementation of ergonomic controls at an early stage, the risks of developing work-related musculoskeletal disorders are reduced or eliminated.

The need for a scientific research approach in the implementation of ergonomic controls is imposed as one of the most significant ways to deal with musculoskeletal disorders and improving safety , wellbeing and efectivness of employees.

This paper analyzes the ergonomic risks among employees in the automotive car seats production as well as the control mechanisms that can reduce or eliminate the occurrence of work-related musculoskeletal disorders (MSDs).