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75 Scientific Journals of the Maritime University of Szczecin, no. 75 / 2023



 

Recent Submissions

  • Pacana, Andrzej; Czerwińska, Karolina (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The state of the technical infrastructure determines the degree to which the quality requirements of products are met and has a significant impact on occupational safety. The purpose of this study is to build a universal model for supporting quality management, which allows the effective implementation of a wide-ranging research path supporting the evaluation of the relationship between the degree of modernity of product processing technology and the quality of the final product and the level of occupational safety. The developed model is verified by its implementation in one of the turning stations. A practical test of the quality management support model confirms that the practice of conducting analyzes of the level of modernity of infrastructure with its application contributed to identifying critical machine components, examining factors affecting the quality of technological operations, reducing uncertainty and the risk of risky events, and conducting activities in line with the concept of continuous improvement. The course of action detailed in the model makes it possible to determine the relationships that exist between key categories of factors and critical product defects, and accidents and near-misses. This allows for the proposal of adequate improvement measures. Further studies concern the implementation of the model at other workstations in the foundry company
  • Kacprzak, Paweł (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The main issue of this article is to apply and investigate the application of second stability criteria for bulk carriers in typical loading conditions sailing in irregular waves. The author, by the use of linear strip theory, calculates the significant amplitudes of the ship roll with respect to wave height, incident wave angles, and mean sea period. A basic stability analysis, in this case, could be insufficient when considering other related factors like cargo shift, taking up water on the weather deck, wind gusts, inaccuracy of transverse metacentric height, and the case of changing transverse metacentric height in long-crested waves. This article shows that, in some waving conditions, the weather criteria based on standard assumptions of the ISC 2008 may be insufficient. The application of the author’s method of safety margin may increase vessel safety in view of weather criteria.
  • Ścigała, Roman; Szafulera, Katarzyna; Jendryś, Marek (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The loss of stability of shallow voids existing in the rock mass often results in the formation of sinkholes on the surface. This has a significant impact on the threat to public safety. Therefore, it is crucial to recognize the presence of such voids, especially in old post-mining areas, where shallow extraction was previously conducted, and there is a lack of mapping documentation indicating the location of underground workings. This paper presents an example illustrating a proposed procedure for recognizing shallow voids, which consists of two research works: geophysical research combined with numerical analyzes used as a kind of forward modeling. This combination increases the possibility of accurately locating potential sinkhole occurrences. The first part of this article provides selected literature information on the occurrence of sinkhole hazards. The second part presents the results of subsurface layer investigations of the rock mass conducted using electrical resistivity tomography (ERT). The third part focuses on assessing the threat of sinkhole formation by using forward numerical modeling performed with the FLAC 3D software to confirm the subsurface structures identified through the ERT method. The results of the analyzes conducted with both methods are then discussed in terms of their suitability for assessing the associated risk. The research conducted within the framework of this study confirms the effectiveness of the ERT method combined with numerical modeling for evaluating the state of the rock mass. This method can be considered a valuable tool for supporting decision-making in identifying post-mining areas that are particularly at risk of sinkhole formation.
  • Jura, Jakub (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This article presents the influence of ashes generated in the combustion processes of various types of biomasses on the durability (resistance to freezing and thawing after 25 cycles) of cement mortars. Three types of ashes were used for the tests: two fly ashes and one bottom ash. These differ in chemical composition and microstructure in the amounts of 10%, 20%, and 30% of the cement mass and are used as a substitute for standard sand. The ashes are characterized in terms of microstructure and chemical composition. The research shows that, regardless of the type of ash used, all the cement mortars containing ash are characterized by higher durability than the control mortars. Among the modified mortars, the smallest decrease in resistance (by 0.54%) to the process of freezing and thawing is shown by cement mortars containing 10% fly ash from the combustion process of biomass with the addition of sunflower, and the largest (by 7.56%) show mortars containing 30% bottom ash from the combustion of biomass with the addition of sunflower. These findings suggest that the incorporation of biomass ashes, particularly fly ash, into the cement matrix mixes has the potential to improve their durability for road infrastructure applications.
  • Pietrzak, Alina (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This paper presents study results on the effect of the addition of polymeric waste on selected mechanical properties (flexural and compressive strength) of cementitious composites with a special emphasis on cement mortars. This research focuses on cement mortars, commonly used in construction applications such as seaports and quays. Here, post-production waste from the production of automobile floor mats is ground to a fraction of 0–2 mm and used in the amounts of 5%, 7.5%, and 10% by weight of cement as an additive or substitute for sand. All the presented tests are conducted in accordance with PN-EN 197-1. The purpose of these tests is to determine the possibility of using thermoplastic waste as an aggregate substitute or additive in cement mortars. The conducted research confirmed the possibility of using the mentioned waste in cement mortar production technology in the amount of 5% as a substitute for sand.
  • Lysenko-Ryba, Kateryna; Woch, Maciej (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The main purpose of this article is to prepare an appropriate plan for the development of the infrastructure of the Bieszczady region for the use of electric cars as the primary means of mass and private transport for residents and tourists in the Bieszczady region. Over the next few years, electric cars will be available to an increasing number of people, thanks to more affordable purchase costs. This is made possible due to the dissemination of technology on the market and the emergence of increasing competition in individual segments of the automotive industry. The decisive condition will be the appropriate infrastructural facilities – i.e., chargers for electric cars, both those “fast” for direct current (DC) and “slow” for alternating current (AC). The development of infrastructure directly contributes to the purchasing decisions of electric cars made by residents of a given territory or people traveling through a given country with their own cars in the context of potential supplementation of electricity. In the first part, a review of the literature on the topic of electric cars is introduced. The second part presents the Bieszczady region in the context of electromobility implementation. In the last part, a detailed analysis of the region’s infrastructure (roads and car parks) is prepared, and, as a consequence, places are selected where the construction of a charging station would be justified. During point selection, the key parameters are the current condition of the road and parking infrastructure, the number of residents and tourists in a given zone of the region, and the strategic importance of the region. This article presents a detailed infrastructure analysis of locations where charging stations could be installed, including their amounts and power, in the Bieszczady region. The latter is divided into communes (i.e., Ustrzyki Dolne, Czarna, and Lutowiska), which provide a total of 14 locations, 55 stations, and 113 charging points. Introduction In the face of the challenge of the current climate crisis, it is necessary to accelerate the so-called energy transition to mitigate the harmful effects on the planet caused by the increase in greenhouse gas emissions into its atmosphere over the last few decades (Cook et al., 2013). One of the main pillars of this transition is the decarbonization of the econom
  • Jagusiak-Kocik, Marta (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The aim of this work was to determine the effectiveness of using the FMEA method in the traditional and modern versions for a small company producing plastic toys. It also identified the production process of a plastic instrument toy selected for analysis by dividing operations into adding and not adding value, in accordance with the Lean concept. Through the FMEA sheets constructed and presented in this work in both versions of this method, the causes and effects of defects in the technological operations of the production process of the test subject were presented. A risk analysis was carried out using assessments available for the traditional and new versions, and preventive and detective actions were proposed. The result of the work was a comparison of risk indicators characteristic for both versions of the FMEA method and an assessment of the effectiveness of this method in the analysed enterprise. Emphasis was placed on the human factor in the research. Both the division of operations into adding and not adding value, as well as the FMEA method, were useful for further optimization and process improvement activities.
  • Czerwiński, Dariusz; Kiersztyn, Adam; Przyłucki, Sławomir; Oniszczuk-Jastrząbek, Aneta; Czermański, Ernest (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Maritime and coastal areas are the lifeblood of many countries. They are vital to the prosperity of countries because they provide trade routes, regulate the climate, are a source of organic and inorganic resources and energy, and provide a place for the public to live and relax. Increasingly, however, there are divergences and barriers to the use of marine areas. On the one hand, available and developed technology and knowledge enable increasingly improved use of the sea. On the other hand, the combined effect of these activities leads to conflicts of interest and the deterioration of the marine environment. The purpose of this study is to analyze the feasibility of using automatic identification system (AIS) maritime traffic data, in terms of its suitability, to correctly assess the utilization of the potential of a specific fleet within the offshore shipping industry. In addition, the authors undertake the task of determining to what extent activities relating to the GPS position of the ship, ship type (i.e., cargo or passenger), ship status (i.e., aground, anchored, moored, not under command, restricted maneuverability, underway sailing, or underway using its engine), ship draught, service speed, total engine power, and deadweight constitute areas and methods for optimizing the use of the offshore fleet under all the conditions previously described that limit this optimization. Given the stated goal, this paper uses both a literature review procedure and statistical methods to conduct a comparative analysis.
  • Kerbrat, Agnieszka; Guze, Sambor (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Since the 1970s, ships in the Kattegat area and the Baltic Sea entrances have been advised to use one of the routes established by the Danish Maritime Safety Administration. As time passed, traffic increased significantly, demanding adjustments to the introduced solutions to accommodate new volumes of ships passing through the entrances to the Baltic Sea. It is estimated that about 70,000 vessels are passaged via Kattegat yearly. Additionally, an increase in the traffic of fishing vessels and small pleasure crafts of different types has been observed, necessitating regulation to ensure the safety of navigation for everyone involved. Therefore, on the 1st of July 2020, a new routing system was introduced in the area of Kattegat by the decision of the International Maritime Organization (IMO). This paper focuses on the exact changes made and how those changes may influence the safety of navigation in Kattegat and the Sound, considering the COLREG rules and human factors in planning and executing passage via this area. A short presentation of recent accidents, and a study of difficulties arising from the new traffic organization, will be given. Brief traffic analysis is conducted using IWRAP MK II software, and historical AIS data from research will advance a more detailed examination and simulations. Finally, the introduced routing system’s effectiveness is compared using density plots from chosen periods. Furthermore, the analysis of the influence on the safety of navigation, as the introduced solution, is observed to be unusual. New routings have been in force for over two years and are accepted and used by most merchant vessels operating in Kattegat. Even so, this period is too short to clearly state that it is completely safe.
  • Kunytska, Olga; Persia, Luca; Iwan, Stanisław; Datsenko, Diana; Kijewska, Kinga; Gurrieri, Adriano (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Parcel lockers seem to be a very interesting and innovative solution for any type of city, beneficial to both customers and online stores. Accounting for the growing number of B2C e-commerce customers, this measure significantly meets their needs. Moreover, this solution solves the challenges of last-mile deliveries, which are one of the major effects of heavy traffic of commercial vehicles in the whole city area. Recipients and senders of parcels through parcel lockers are the main generators of demand for this service. Hence, assessing their satisfaction and requirements is a key indicator of the development of this area. This work focuses on the efficiency of user parcel lockers and compares the situation in Italy, Poland, and Ukraine. This paper also presents an analysis of the already existing data on the satisfaction of parcel locker users, as well as the results of a study conducted among Ukrainian consumers for this work.
  • Błotnicki, Jan; Gruszczyński, Maciej; Jarzembowski, Paweł; Popczyk, Marcin (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Ice phenomena in watercourses and channels pose a threat to flow continuity and hydrotechnical devices. The organoleptic method, relying on human observation, has limitations such as a narrow range, subjective assessment, and high effort, leading to its decline in use. This article presents a number of modern techniques, i.e., the interpretation of RGB images, using unmanned aerial vehicles. Drone imagery offers a bird’s-eye view of areas that would otherwise be difficult to survey. It can improve the detection of frazil ice jams and, thus, contribute to the monitoring and spread of frazil ice. The authors performed research in the area of the Wrocław Water Junction on the Odra River in the area of the inlet near the fish pass at the Opatowice Weir during the flow of frazil ice on the water surface. To observe the phenomenon, a UAV with an RGB camera was used to record video in an orthogonal perspective in order to reduce geometric distortions of the optical system. The center of the frame was used for the analysis. The presented research results and the recognition of the literature indicate the possibility of using the presented technique for early detection of a potential threat from emerging ice phenomena. The results of the conducted analyses are objectively compared to the observational technique used at observation stations and allow for a reliable comparison of the intensity of ice phenomena in selected periods.
  • Brožová, Silvie; Brož, Jiří; Ingaldi, Manuela (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The convergence of hydrometallurgical waste management and the principles of the circular economy holds immense potential for addressing the challenges posed by metal-enriched waste. By turning waste into valuable resources through efficient metal extraction, this approach not only aligns with sustainable development goals but also contributes to the conservation of resources, reduction of waste, and the promotion of economic and environmental well-being. This article deals with the further possibilities of processing metal-bearing wastes in the form of steel drifts via hydrometallurgy. The main part of this research focuses on the development of suitable technology for the leaching of steel flakes to obtain selected non-ferrous metals, mainly zinc and lead, for economic and environmental reasons. Laboratory experiments are carried out to verify a suitable leaching agent in the form of high-temperature acid leaching, neutralizing leaching, and magnetic separation verified in lead seals. From the results of the experiments, a suitable technology for processing steel fumes is proposed.

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