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  • Bistrović, Miroslav (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Today, every industry is striving for the highest efficiency and best economic results possible, with the greatest possible competitiveness. But in maritime affairs, human safety and environmental protection are the foundations of sustainability. To achieve this, marine systems must be reliable, high quality and easy to maintain. Because of this, reliability has become an important factor in safety, which remains relevant throughout the lifetimes of ship systems, including fire alarm systems. In this paper we address a number of issues connected with the reliability – and ‘availability’ of these systems. Firstly, ship fire alarm systems consist of various components whose individual reliability affect the system’s overall reliability. Discussions of reliability in ship fire alarm systems normally focus on the length of a system’s useful life or performance during design-based fire events. In addition to the reliability of systems, their availability for use is also crucial given the possibility that the system may need to operate at any point in time.
  • Cepowski, Tomasz; Kacprzak, Paweł (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This article presents an analysis of vertical shear forces and bending moments during nodule loading in the case of a standard bulk carrier around the Clarion–Clipperton Zone. An operational efficiency index was applied to an assessment of internal forces during loading which took into account wave heights and periods around this zone. The aim of this research was to investigate whether waves could have a negative effect on loading efficiency and to estimate the nodule mass that can safely be loaded onto a standard bulk carrier taking these waves into account. Moreover, a calculation was made to discover the acceptable vertical shear force percentage limit, while also taking into account wave activity during loading.
  • Zuska, Andrzej; Więckowski, Dariusz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents the results of laboratory simulation tests of a suspension system for a car seat. The first part of the paper contains a description of the experiment, paying particular attention to the conditions in which the tests were conducted and the properties of the electrically controlled damper, which was mounted in the tested car seat’s suspension. Graphs of the damper’s operation were determined for different values of current intensity and the signal controlling the damper’s damping ratio and then the damping characteristics were determined on this basis. Simulated tests of the car seat’s suspension were carried out on a car component test station. During the tests, the values measured were the acceleration recorded at selected points on the dummy, which was placed on a seat equipped with suspension using a magnetorheological (MR) damper during the experiment. The second part of the paper presents an analysis of the results of the experimental tests with particular emphasis on the influence of the current that controls the operation of the damper on the values of the RMS index of the acceleration at selected points of the dummy.
  • Oluyege, J.O.; Orjiakor, P.I. (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    All over the world, the use of medicinal plants is gaining more acceptability due to the possibility of discovering novel drugs from them and solving the problem of antimicrobial resistance associated with conventional antibiotics. The phytochemical composition and antimicrobial properties of crude extracts of the leaves, stems, and bark of Annona muricata were evaluated on Escherichia coli, Staphylococcus aureus, and Salmonella typimurium, while the antifungal properties were evaluated against Candida albicans and Candida tropicalis. The Agar well method was used for the study. At concentrations of 150 mg/ml and 300 mg/ml, inhibitory effects were observed on E. coli and S. aureus, with a visible zone of inhibition ranging from 15 mm to 21 mm respectively, and with respect to N- hexane, an antimicrobial activity range of 5 mm to 20 mm, for the leaf extract, which shows effective antimicrobial action against E. coli and S. aureus. Hot water extracts were observed to possess more bioactive compounds compared to organic solvent extracts, and exhibit higher ranges of activity against the tested bacterial species. All extracts exhibited low anti-fungal activity in the range of 8 mm to 15 mm. The phytochemical screening of the extracts of different parts of A. muricata revealed the presence of secondary metabolites such as tannins, alkaloids, saponins, flavonoids, steroids, and cardiac glycosides. The antimicrobial activity of the extracts was compared with a standard antibiotic, ketoconazole, and with ampicillin, which served as the controls). The results showed that A. muricata can be used as an anti-bacterial substance, since it shows broad spectrum activity against a range of bacteria responsible for the most common bacterial illnesses. Further research will be necessary to ascertain its full spectrum of efficacy.
  • Paliszewska-Mojsiuk, Monika (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The Belt and Road Initiative (BRI) is focused on extending the cooperation between China and the countries of Central Asia, the Middle East, Africa, and Europe. The five goals laid out by the Chinese government, along with unimpeded trade and financial integration, include people-to-people bonds. This last goal is to be achieved by education and international academic cooperation. In 2016, China’s Ministry of Education provided a detailed framework that stated which educational projects may be implemented within the BRI. The aim of this research is to analyze, based on the official documents proposed by Chinese ministries, the variety of educational programs offered by the Chinese government to the BRI countries. Furthermore, their strengths and weaknesses will be shown, and the article will also focus on the opportunities available for Polish higher education institutions that may profit from well-led projects.
  • Poszewiecki, Andrzej (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Various economic theories indicate that many factors determine the competitive position of national economies. In addition to classical factors such as natural resources, technology, and capital (including human capital), other elements include openness and readiness to generate and implement innovation. An important role is played by institutional and legal systems, which provide economic liberty, free competition, and protection against monopolies, corruption, and crime. According to some research, an important role is also played by issues related to intellectual property (and more precisely, industrial property). The purpose of this article is to verify the importance of intellectual property on economic development. For this purpose, literary studies and patent research were primarily used, including an analysis of the relative specialization index (RSI). The analysis results indicated that the effect of IPP on GNP was not explicit and, depending on the starting position of an economy, and an increase in IPP outlays may have various effects. Another important finding is the extraordinarily dynamic growth of the Chinese economy, as measured by patent indices.
  • Jasionowski, Robert (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Dear Readers, At the beginning of this issue 59(131), I would like to pass on an important message to all of our readers. On 31 July 2019, the Ministry of Science and Higher Education published a communiqué concerning the list of scientific journals and peer-reviewed materials from international conferences with a number of points assigned. The Scientific Journals of the Maritime University of Szczecin were submitted for evaluation by the Ministry of Science and Higher Education in three disciplines: 1) civil engineering and transport, 2) mechanical engineering, 3) environmental engineering, mining and energy, and received 20 points based on the opinion of the advisory panels. As Editor-in-Chief of the Scientific Journals of the Maritime University of Szczecin, I have made it my goal to develop the journal by attracting new authors and publishing high-quality scientific papers. To achieve this, I have decided to expand the subject matter of this journal. From the next issue 60(132) onwards, scientific papers will be published in the following thematic groups: – mechanical engineering; – civil engineering and transport; – environmental engineering, mining and energy; – automation, electronic and electrical engineering; – information and communication technology; – management and quality studies; – miscellaneous. Expanding the subject matter of the scientific papers will make the quarterly Scientific Journals of the Maritime University of Szczecin an interdisciplinary publication. In the future, this should increase the standing of our quarterly publication on the national and international arenas and allow us to obtain a higher score in the next list of the Ministry of Science and Higher Education, which is to be published in two years. In this issue of MUS Scientific Journals, we present the results of nineteen studies published in four disciplines: Marine Technology and Innovation, Navigation and Maritime Transport, Transport Engineering, and Miscellaneous. Marine Engineering & Innovation contains three articles. The author of the first paper presents the effectiveness of WHR hydrogen technology and a mathematical model of a relevant system intended to increase the efficiency of a ship power plant. The next paper presents issues related to recycling watercraft and the benefits of such undertakings for the natural environment and economy. The third paper presents the results of hardness tests of laminated composites reinforced with crushed polyester-glass recyclate. 6 Scientific Journals of the Maritime University of Szczecin 59 (131) In the second section, Navigation and Maritime Transport, there are two articles. The first one covers issues related to the mathematical optimization of the shift schedules of a ship’s crew. In the second paper, the authors present very interesting findings of research on modelling an unmanned vessel equipped with ecological electric drive. The third section, Transport Engineering, contains ten articles. The authors of these papers address issues related to the organization and management of transport engineering in sea ports and the significance of inland waterways in transport systems and the transport’s impact on the maritime economy. In this section, the reader will also find papers on inland tourism, integrated transport, and the environmental impacts of the latter. The fourth section, Miscellaneous, contains four articles. The first paper presents an analysis of how the GDP dynamics in the EU from 2009-2018 were influenced by intellectual property development expenditures. Another paper studies the use of a participatory budget as a tool to support sustainable urban development. The third article presents the findings of studies on the production of the lipase enzyme from Pseudomonas Aeruginosa used in biotechnological processes. In the last paper, the author presents legal issues concerning plastics polluting marine environments. All readers are invited to visit our website http://scientific-journals.eu, where, in the near future, they will find information about expanding the subject matter of papers published in the Scientific Journals of the Maritime University of Szczecin. All information on the article publication process and full texts of articles from this issue 59(131) and previous issues will be published at this site, as well. Robert Jasionowski, PhD Editor-In-Chief Szczecin, 30.09.2019
  • Cherednichenko, Oleksandr; Tkach, Mykhaylo; Timoshevskiy, Boris; Havrysh, Valerii; Dotsenko, Serhii (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Due to environmental, energy, and operating cost constraints, the number of liquefied natural gas (LNG)–powered ships is increasing. To avoid decreasing the thermal efficiency of two-stroke, low-speed diesel engines, high-pressure gas injection is used. The specific energy consumption of a gas fuel compressor is around 0.35 kWh/kg, which has a negative impact on the efficiency of ship power plants. To reduce the primary energy consumption of a gas fuel supply system, waste heat recovery (WHR) technologies may be used. This study investigated whether WHR metal hydride technology was suitable for improving the efficiency of low-grade heat waste in marine diesel engines. The key factors of this technology were revealed, and the design scheme was described. Working fluids were also analyzed, and a mathematical model of a WHR metal hydride plant was developed, and the results were represented. The calculations showed that the above technology could increase the operating power of a propulsion plant by 5.7–6.2%. The results demonstrate the possibility of applying WHR metal hydride equipment for gas fuel compressor drives in LNG-powered ships. The novelty of this study lies in the investigation of metal hydride technology for application in the waste heat recovery systems of LNG-powered ships.
  • Nyka, Maciej (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Ships are valuable sources of steel and other natural resources which can potentially be recycled and reused for economic and environmental benefits, and between 700 and 1000 ships are scrapped annually. On the other hand, up to 5% of the mass of a ship is dangerous wastes. Developed states and the European Union have introduced restrictive regulatory measures to regulate the conditions and locations of ship scrapping facilities. Despite the environmental benefits, these regulations may lose their battle for efficiency due to Asian countries which are engaged in a regulatory race to the bottom to attract ship owners to scrap their ships in their territories. The findings of this research indicate that despite being included in international and EU laws on ship scrapping, the specific instruments to prevent the movement of ship scrapping into the jurisdictions with low environmental standards are ineffective. A new global regulatory instrument is required which can find a balance between strict environmental protections and the economic interests of both the ship owner, companies engaged in ship scrapping, and countries which take economic advantage of those processes.
  • Panasiuk, Katarzyna; Kyzioł, Lesław; Abramczyk, Norbert; Hajdukiewicz, Grzegorz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The attractive characteristics of polyester-glass composites have led to their use in many industries, but using them as structural elements requires knowing their mechanical properties. This paper presents processing methods of polyester and glass scrap and their use in the production of new composites. This scrap, called the recyclate, was pre-crushed, ground, and then passed through sieves to obtain the desired fractions. Composite materials with added recyclate were made by hand lamination. Composites were made and then used to conduct appropriate tests to determine the degree of cure of the resin, and to determine the effect of the polyester- glass recyclate content on the hardness of composites. For this purpose, rectangular panels with a thickness of g = 8 mm were produced by manual lamination. Each plate contained 0% glass mat, 10% resin, and 20% recyclate with granulation ≤ 1.2 mm and ≤ 3 mm. Then, test samples were formed from each plate. Hardness measurements were performed using the ball-pressing method. In addition, structural studies were carried out to determine the correlation between the structural and mechanical properties of the discussed materials. The obtained test results showed that the recyclate content and its granulation clearly affected the mechanical properties of the tested composite materials.
  • Bošnjak, Rino; Bukljaš, Mihaela; Medić, Dario; Vukša, Srđan (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Seaborne shipping must often cope with issues related to planning, ship scheduling, and arranging crews and optimal shipping routes between ports. Human resources departments typically plan ship crew shifts with regards to the seafarers’ right to vacation days. It is difficult to harmonize all the requirements and to satisfy both the seafarers and the company. Ideally, arrangements are made for the crewmember to sign off upon completion of a contract, with the vessel being at a port convenient to change the crew at a minimum cost. The latter may vary greatly, depending on the size of the crew to be replaced, the distance of the port from the crew destination, and the available taking-over crew at a specific place and time, etc. In these situations, linear programming (LP) is frequently used as a mathematical method to determine the optimal results. This study suggests the use of a linear-binary programming model in LINGO software to arrange the ship’s crew change schedule.
  • Szelangiewicz, Tadeusz; Żelazny, Katarzyna (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    As part of this research, an experimental model of an unmanned ship equipped with an ecological electric drive was built. Ultimately, the ship model was equipped with an on-board computer with appropriate software for autonomous control. A computer simulator was used to test the control software. This article presents the concept of such a simulator, a general mathematical model of the movement dynamics of an unmanned vehicle, a description of the propulsion system, and the tasks planned for implementation in a computer simulator.
  • Bernacki, Dariusz; Lis, Christian (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This study aims to identify and quantify the economic benefits of eliminating collisions between two transport systems: rail and inland waterway transport. The collision between transport systems is caused here by the obsolete structure of a railway drawbridge, which constitutes an element of the railway line used by freight and passenger transport and is located on the main inland waterway used by inland waterways freight transport. Railway transport results in limitations of inland waterway transport and, vice versa, inland waterways transport blocks railway transport during lifting of the bridge span. In the case of railway transport, the low capacity of the single-track railway bridge constitutes an additional limitation of the development of transportation. There are plans to eliminate the collision in the regional transport system by constructing a new railway bridge in place of the old drawbridge. The effects of the transportation infrastructure improvement were measured directly for both rail and inland water freight systems as well as the result of the interaction between passenger rail and car and bus transport. In order to compare the different types of impact, the effects of different actions were valued in monetary terms. The planned intervention, as investigated here, will lead to reductions in the cost of time of inland waterways freight transport and costs of time of rail passenger and freight transport and a decrease in the external costs of transport. This will make possible transportation services that are both cheaper and more reliable.
  • Bernacki, Dariusz; Lis, Christian (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The aim of this paper is to identify and quantify the direct economic effects resulting from navigational restoration of the Dąbie Lake inland fairway, a part of the West Pomeranian region (PL) transport system that runs across the Dąbie Lake. This narrow and shallow inland fairway constitutes the bottleneck for inland waterway freight transport, which must therefore use the sea fairway and thereby incur extended time, increased cost, and reduced efficiency of inland waterway transport. The paper’s second section presents the transport and microeconomic effects that restoring the fairway’s navigability across Lake Dąbie would have on the inland navigation system, thereby increasing the capacity, effectiveness, and safety of inland waterways freight traffic. Restoration of the inland fairway would significantly reduce generalized and external costs of inland waterways transport.
  • Kijewska, Monika; Kasyk, Lech; Pleskacz, Krzysztof (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper analyzes the influence of air mass movement on moving (the leeway) surface water in the Świnoujście– Szczecin fairway region on the Szczecin Lagoon. The Szczecin Lagoon includes waters of the Odra River estuary (Poland’s second largest river) and the southern Baltic Sea. To calculate the leeway parameters, a relevant surface drifter was outlined and constructed. The data on the leeway of the drifter was obtained from in-situ experiments conducted on the Szczecin Lagoon in the summer of 2018. In turn, the air mass movement data was recorded at meteorological stations in Trzebież and Świnoujście. A statistical analysis of the leeway parameters of the drifter was also presented. Distributions of the leeway and wind speeds in the Świnoujście– Szczecin fairway regions were established. Moreover, linear regressions between the leeway and wind parameters were performed by decomposing the leeway into its downwind and crosswind components for each 10-minute sample. It is worth highlighting that relationships between these components of the leeway and wind parameters were studied for weak, medium, and stronger winds. This research may be useful for increasing navigation safety in the Świnoujście–Szczecin fairway regions on the Szczecin Lagoon.

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