Scientific Journal of Gdynia Maritime University

CELESTIAL NAVIGATION AS THE EMERGENCY GNSS BACKUP: ENHANCING NAVIGATIONAL RELIABILITY

Ihor Liubarets — Thu, 28 Mar 2024 00:00:00 +0000

The development of Global Navigational Satellite Systems (GNSS) has revolutionised navigation on ships. GNSS, together with electronic chart display information system (ECDIS), has made navigation more accurate, efficient, and safer for sailors. However GNSS signals can be affected by various factors such as spoofing, jamming, ionospheric disturbances etc., while no backup means of position fixing in the open sea are available on board ships. Over-reliance on GNSS without the development of an alternative backup will jeopardise safe navigation of ships. However, most of the alternatives available are either complicated or expensive. By changing certain regulations and further development celestial navigation, a reliable and cost-effective backup system can be obtained.

ASSESSMENT OF THE OPERATION OF THE PUMP CONTROL SYSTEM USING THE PID CONTROLLER

Łukasz Betliński, Mostefa Mohamed-Seghir — Thu, 28 Mar 2024 00:00:00 +0000

The purpose of this project was to design and construct an experimental setup enabling pump operation to be controlled and ensuring the smooth regulation of its efficiency. The closed liquid circuit is equipped with a throttling valve to slow down the flow. In addition, flow meters were used in the installation to enable the flow to be measured. Ultimately, after choking the flow, the pump could be controlled in such a way that maintained the set flow value. The PID controller fulfilling this function can be configured by changing its settings.
In this way, an expiermintal setup can demonstrate the influence of individual elements of the regulator on the efficiency of regulation. This work is a continuation of further research related to the project number: 006/RID/2018/19 financed under the program Ministry of Science and Higher Education.

ANALYSIS OF THE EFFECT OF THE ADDITION OF ALUMINUM POWDER ON POLYESTER-GLASS COMPOSITE PROPERTIES IN TENSILE AND HARDNESS TEST

Thu, 28 Mar 2024 00:00:00 +0000

The study aimed to analyse the influence of aluminum powder on the mechanical properties of polyester-glass composites. Composite materials were made of glass fibres with random fibre direction and polyester resin with the addition of aluminum powder as a filler. The strength parameters of materials obtained during the static tensile test and hardness test were compared. The results were subjected to statistical analysis, taking into account the change in the amount of filler, microstructure was also observed using optical microscopy.
An analysis of the results showed that the addition of aluminum powder amounting to 2% of the weight of the composites reduces their hardness and, at the same time, the longitudinal modulus of elasticity.The addition of aluminum powder amounting to 5% and 10% of the weight of the composites increased the hardness of the composites while reducing the Young's modulus. The values of hardness measurements were subjected to statistical analyses at significance level α = 95. The Shapiro-Wilk test confirmed that the hardness variables for all tested samples were in normal distributions, and therefore the most powerful parametric tests were used to test the differences. Using the Student's t-test, it was confirmed that between pairs of variables in configurations: a standard sample with a modified sample, for all tested samples there are significant statistical differences in the distributions of hardness values. Studies have shown that the modification of the mechanical and strength properties of composite materials, through the use of an aluminum filler, makes it possible to obtain materials with variable parameters that can be useful and attractive in many new areas, depending on the application and user requirements.

SENSORY MARKETING ACCORDING TO SHOPPING CENTRE CUSTOMERS

Agnieszka Rybowska — Thu, 28 Mar 2024 00:00:00 +0000

Sensory marketing is one of the forms of marketing communication and a method of customer attachment to the brand. It is based on influencing the customer's senses, which is supposed to affect their sensory experience and, as a result, positive recollection of the product's brand. The aim of the study was to find out the opinions of shopping mall customers on sensory marketing activities. Two studies were conducted: a survey and an observation study. Both surveys involved young people: customers of shopping malls. It has been shown that young customers are knowledgeable about sensory marketing but often do not notice how it works at purchasing points. The respondents concluded that, in such a situation, sensory stimuli influence the choice of product, but not necessarily people's attachment to the brand. The stimuli used in audio and aroma marketing have a positive impact on customers but sometimes they are also perceived negatively. The research shows that you need to monitor your target customer groups and adjust sensory stimuli to their tastes. It may be used by organisations for product management and marketing planning purposes.