2018 - Publications Repository - Gdańsk University of Technology

Show publications from the year

Publications from the year 2018

Show all

The Caustic in the Acoustics of Historic Interiors
- Andrzej Kulowski
2018 Full text APPLIED ACOUSTICS
In the paper, caustics are discussed as ordered forms of focus broadening occurring in concave mirrors. Presented are examples of caustics formed in natural conditions and application of the phenomenon in different fields of science and technology. Against this factual background, the possibility to observe caustics in rooms is pointed out. Special emphasis is put on large rooms of historic character, as such interiors frequently include acoustic mirrors in the form of arched vaults and concave walls. As a case study, the eighteenth-century Whispering Grottoes representing one of attractions of the Oliwa Park in Gdańsk was selected, where the phenomenon of forming a caustic was used intentionally to obtain the desired acoustic effect.
The changes of crosslink density of polyurethanes synthesised with using recycled component. Chemical structure and mechanical properties investigations.
- Patrycja Jutrzenka Trzebiatowska
- Arantzazu Santamaria-Echart
- Tamara Calvo-Correas
- Arantxa Eceiza
- Janusz Datta
2018 Full text PROGRESS IN ORGANIC COATINGS
This paper aims at the utilisation of glycerolysate (Gly) obtained in polyurethane recycling process by means of crude glycerine, which has in its structure hydroxyl end groups that allow for further processing. Polyurethanes (PUs) were synthesised using prepolymer method with the mixture of neat polyol and glycerolysate, in different ratios, with 4,4-diphenylmethane diisocyanate (MDI). The prepolymer was subsequently extended using 1,4-butanediol (BD). The incorporation of glycerolysate caused the crosslinking of obtained polyurethane materials. The crosslink density was calculated from swelling measurements by means of Flory and Rehner equation. The effect of recycled component content on the structure, thermal and mechanical properties were investigated by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and mechanical tests, respectively. Morphology was also analysed by atomic force microscopy (AFM). As the content of recycled component increased, the swelling ratio decreased and simultaneously crosslink density increased, resulting in the increase of glass transition and storage modulus at room temperature. Thermomechanical stability, tensile strength, elastic modulus and hardness of PUs also increased with the incorporation of glycerolysate. Although elongation at break decreased, the recoverable deformation increased with the content of glycerolysate. Morphology reveals the transition from a microphase-separated microstructure to an interconnected hard segments domain structure with the incorporation of glycerolysate. These materials can be applied as protective coatings.
The circle object detection with the use of Msplit estimation
- Artur Janowski
2018
The paper presents the use of Msplit(q) - estimation in the filtration and aggregation of point clouds containing a known number of elliptical shapes with preliminary unknown - locations and dimensions. These theoretical solutions may have practical relevance especially in the modelling of terrestrial laser scanning data of objects that have similar shape to circles. Mentioned shapes can be scanned of tree trunks, columns, gutters, etc., that are elliptical in the horizontal plane. The results are satisfied and encourage furthermore detailed research, particularly with the extension of 3D applications.
The Comparison of the Crypto- and Fiat Currencies’ Exchange Rate Volatility in The Years 2015–2017
- Robert Sterniński
2018 Full text Przedsiębiorczość i Zarządzanie
The article describes the issues related to exchange rate volatility of crypto- and fiat currencies. The first part presents the issue of exchange rate volatility as well as methods of its evaluation and criteria of the conducted research. In the next part the author presented the essence of currencies and the main currency i.e. fiat money in the global economy in terms of the volume of transactions on the FOREX market. Then the main idea of crypto currency was presented – together with its advantages as well as disadvantages and main currencies in the economic cycle in terms of their market capitalization. Next, the results of research on exchange rate volatility in the time horizons were presented: 1-day, 1-week, 1-month and 1-year. The exchange rate fluctuations of EUR, JPY, GBP and BTC, ETH, XRP cryptocurrencies against the US dollar were analyzed. The article was concluded with a summary, which shows that cryptocurrencies are characterized by significantly greater exchange rate volatility against the so-called traditional currencies.
The concept of anti-collision system of autonomous surface vehicle
- Andrzej Stateczny
- Waldemar Gierski
2018
The use of unmanned vehicles in various fields of science and the economy is becoming more common. An extremely important aspect of creating this type of solution is to provide autonomous vehicle navigation, which does not require interference of the human factor or in which it is limited to a minimum. This article discusses the concept of autonomous anti-collision system of unmanned surface vehicle. It proposed a sensor system for the comprehensive implementation of the vehicle path in an automatic manner and presented the idea of remote sensing data fusion.
The concept of estimation of elevator shaft control measurement results in the local 3D coordinate system.
- Daria Filipiak-Kowszyk
- Waldemar Gierski
- Waldemar Kamiński
- Karolina Makowska
2018
Geodetic control measurements play an important part because they provide information about the current state of repair of the construction, which has a direct impact on the safety assessment of its exploitation. Authors in this paper have focused on control measurements of the elevator shaft. The article discusses the problem of determining the deviation of elevator shaft walls from the vertical plane in the local 3D coordinate system. It presents a concept of estimation of measurements results base on the parametric method with conditions on parameters. The simulated measurement results were used to verify the concept presented in the paper.
THE CONCEPT OF MODELING OF SNOW IMPACT ON THE STRUCTURE OF THE SUSPENDED TAURON ARENA ROOF IN CRACOW
- Karol Grębowski
2018
The article presents studies and numerical simulations on modeling snow influence on TAURON ARENA suspended roof structure in Cracow. The scope of work includes experimental tests, functions solutions taking into account various cases of snow impact according to PN and EC, as well as numerical simulations for the sport and entertainment arena in the Czyzyny district. The FEM roof structure model developed in the SOFISITK software consists of bar and surface elements. The structure is made of bar elements, whereas the facade and the roof slope are made of surface elements. Finite element method meshing is developed using the Coons' method and four-node elements with six degrees of freedom are applied on each node. The conducted research and numerical analyses allowed for establishing a proper way of snow distribution on the load bearing elements of the structure. The results of the work will act as a guidelines for services dealing with the roof maintenance, and will minimize the risk of a collapse caused by improper snow removal.
The condition of economies. Do most valuable global brands matter?
- Karol Flisikowski
- Wioleta Kucharska
2018 Full text EQUILIBRIUM Quarterly Journal of Economics and Economic Policy
Research background: Brands are considered to be the most valuable asset of a company. Some of them achieve spectacular global results. The significance of global brands is proved by the fact that their value is often greater than the sum of all company’s net assets. Purpose of the article: The aim of this article is to highlight that brand value does not only create company’s value, but also leverages economies. The Authors claim that even though global brands are sold worldwide and are a part of “global factories”, they strongly relate to the development of economies in the countries where these brands’ headquarters are located. Methods: Based on 500 Brandirectory, the Most Valuable Global Brands ranking powered by Brand Finance, an analysis of spatial autocorrelation of brand values, GDP per capita was performed and also the interdependency between them was illustrated with the use of the spatial cross-regressive model (SCM). The SCM approach allowed us to include spatial effects of brand values into the final form of the estimated equation. The empirical analysis was performed for 33 countries in 2014. Findings & Value added: Findings confirm the hypothesis that there is a highly statistically significant relationship between brand value and GDP per capita and, what’s more, it is observed that spatial dependencies matter for brand values. The evidence is based on the results of spatial cross-regressive model (SCM).
The conducted EMI in DC-DC converters
- Piotr Musznicki
2018
This book presents the phenomena of conducted electromagnetic interference (EMI) generation in DC-DC converters. The measurement and simulation are used to analyze the impact of the most important parameters on the character, level and propagation path of interference. In this book, the analysis of the interference generation and propagation is presented on the example of three basic converters. The wide banded behavior of all components is presented including basic elements and its parasitic and the connection layout. It focuses on the influence of parasitic components on the nature of interference in the frequency domain up to 30MHz was carried out. The book includes practical design and operation tips that will help to reduce the EMI. It provides useful knowledge about designing of the converters with the low level of outgoing EMI.
The consequences of applying a new Polish Water Law Act for protection against urban flooding
- Ziemowit Suligowski
- Nicole Nawrot
2018 Full text E3S Web of Conferences
Previous legal regulations did not create conditions for a comprehensive solution to the problems of the urban melioration complex. For over 20 years, urban flooding caused by atmospheric precipitation has been systematically recurring in Poland. The article was elaborated on the experience resulting from the 2001 and 2016 floods in Gdansk (Poland). The newly adopted Water Law Act creates a foundation for a systemic solution to previously neglected issues. A new supervisory authority has been introduced as ‘Polish Water’ (in the Polish nomenclature: Państwowe Gospodarstwo Wodne “Wody Polskie”). The Act takes into account the problems of flood risk management and counteracting the effects of drought.
The content of conjugated linoleic acid and vaccenic acid in the breast milk of women from Gdansk and the surrounding district, as well as in, infant formulas and follow-up formulas. Nutritional recommendation for nursing women
- Dorota Martysiak-Żurowska
- Bogumiła Kiełbratowska
- Agnieszka Szlagatys-Sidorkiewicz
2018 Full text Medycyna Wieku Rozwojowego
Fatty acids are some of the most important components of human milk. Polyunsaturated fatty acids (PUFAs) are essential nutrients required for the optimal growth and development of infants, especially the central nervous system, brain and retina. AIM: To determine the conjugated linolenic acid (CLA) and vaccenic acid (VA) content of human breast milk from mothers consuming different diets, and to compare the results with CLA and VA levels in infant formulas (IF) and follow-up formulas (FF). MATERIAL AND METHODS: Fifty healthy mothers were classified according to their diet status into one of two groups: diet low in dairy products and conventional diet without limiting the intake of dairy products. Dietary intake of dairy fat was determined based on 3-day food diaries. Fatty acid (FA) composition in samples were analyzed by High Resolution Gas Chromatography (HR-GC). RESULTS: In the group of 20 mothers whose diets were deficient in dairy products, the average CLA content of breast milk fat was determined to be 0.27% of total FA, the VA 0.36%. In the group of 30 women consuming dairy products, the average content of CLA and VA in breast milk fat was statistically significantly higher: 0.49% and 0.69% of total FAs, respectively. In the fat of the IF and FF tested (n=11) only trace amounts of both FA were found. CONCLUSION: The results of the study indicate that CLA and VA concentrations of human milk can be influenced by diet. It is recommended that the source of these FAs in the diet of breastfeeding women are natural products and not dietary supplements. The majority of commercially available IF and FF do not contain sufficient amounts of CLA and VA, and that their FA composition is deficient in comparison with breast milk fat.
The criteria for evaluation and selection the best tender applied by the authorities in Poland and selected EU countries
- Beata Grzyl
- Magdalena Apollo
- Emilia Miszewska-Urbańska
- Adam Kristowski
2018 Full text MATEC Web of Conferences
The aim of the regulation in EU countries concerning public procurement is to ensure efficient spending of funds by evaluating and choosing the most advantageous offer. The aim of the conducted research is to determine the extent the Polish contracting entities benefit from the possibility of broad selection of various criteria for tender evaluation. On the basis of the analysis of 500 notices on work procedures conducted in the third quarter of 2016 - the third quarter of 2017 in open and restricted tenders in Poland and 500 tenders in open and restricted proceedings in five selected EU countries, the authors compared and classified of applied the practical criteria to evaluate and select the best offer. In order to collect the information presented in the article, the authors applied the documentary method using domestic and foreign literature regarding the subject and official publications.
The Diffusion of Information and Communication Technologies
- Ewa Lechman
2018
This book provides extensive evidence on information and communication technologies development patterns and dynamics of this process across developed economies over the period 1980 to the present day. It adopts newly developed methodology to identification of the ‘critical mass’ and isolation of technological takeoff intervals, which are intimately related to the process of technology diffusion. The statistically robust analysis of country-specific data demonstrates the key economic, social and institutional prerequisites of ICT diffusion across examined countries, indicating what factors significantly foster or – reversely – hinder the process.
The domination of ionic conductivity in tetragonal phase of the organometal halide perovskite CH3NH3PbI3-xClx
- Damian Głowienka
- Tadeusz Miruszewski
- Jędrzej Szmytkowski
2018 Full text SOLID STATE SCIENCES
Organometal trihalide perovskites have recently gained extreme attention due to their high solar energy conversion in photovoltaic cells. Here, we investigate the contribution of iodide ions to a total conductivity of the mixed lead halide perovskite CH3NH3PbI3−xClx with a use of the modified DC Hebb–Wagner polarization method. It has been identified that an ionic conductivity dominates in tetragonal phase which is associated with room temperature. The obtained activation energy for this type of hopping mechanism is equal to (0.87 ± 0.02) eV, which is in a good agreement with previous literature reports. The high contribution of ionic conductivity at room temperature might be a reason of the observed hysteresis in halide perovskite solar cells.
The Drop-in-Drop Encapsulation in Chitosan and Sodium Alginate as a Method of Prolonging the Quality of Linseed Oil
- Szymon Mania
- Robert Tylingo
- Anna Michałowska
2018 Full text Polymers
Nowadays, the encapsulation of sensitive products by various techniques has become popular as a promising preservation method. In particular, this applies to oils with a high content of unsaturated fatty acids and a high susceptibility to deterioration. This work presents the possibility of using a chitosan and sodium alginate in the form of a hydrogel membrane to protect food ingredients such as linseed oil, which is stored in an aquatic environment. The obtained results showed the high efficiency of the coaxial method encapsulation, which did not affect the quality of the oil measured after encapsulation. The greatest protective effect was observed in the linseed oil–chitosan membrane system, in which the primary and secondary oxidation products content were 88% and 32% lower than in the control sample, respectively. The smallest changes of the fatty acid profile, conjugated dienes, and trienes were observed in the chitosan capsules with linseed oil compared to the control sample.
The Dynamical Projectors Method Hydro and Electrodynamics
- Anna Perelomova
- Sergey Leble
2018
The dynamical projectors method proves to reduce a multicomponent problem to the simplest one-component problem with its solution determined by specific initial or boundary conditions. Its universality and application in many different physical problems make it particularly useful in hydrodynamics, electrodynamics, plasma physics, and boundary layer problems. A great variety of underlying mechanisms are included making this book useful for those working in wave theory, hydrodynamics, electromagnetism, and applications.
The Eastern Battery in Świnoujście, Poland - history and architecture of a Prussian coastal fort from the 19th century
- Arkadiusz Woźniakowski
2018
The article describes the history, architecture and development of the Eastern Battery (also known as the Gerhard Fort) – one of three remaining coastal forts in Świnoujście (former Swinemünde) located in northern Poland, by the Baltic Sea. The research is mostly based on historical cartographic material and architectural plans verified during field studies. This data served to create a digital model – one of the results of the study, as well as a research tool helping to detect and visualize transformations of the fort. Thanks to the rich archival collection and good preservation state of the object, it was possible to determine all its stages of construction and modernization between 1848 and 1905, which had not yet been included in contemporary literature. It appeared to be an outstanding example of how coastal fortifications developed, under the influence of new armament and construction materials, during the second half of ninetieth century. This knowledge completes the historiography of military architecture but can also be useful during the ongoing process of restauration of the fort, which serves as a museum and is a significant tourist attraction in the region.
THE EFFECT OF ALTERNATIVE CUTTER PATHS ON FLATNESS DEVIATIONS IN THE FACE MILLING OF ALUMINUM PLATE PARTS
- Michał Dobrzyński
- Daniel Chuchała
- Kazimierz Orłowski
2018 Full text Journal of Machine Engineering
In this paper the relationships between the alternative machining paths and flatness deviations of the aluminum plate part, were presented. The flatness tolerance of the main surface of the plate part has crucial meaning due to the assembly requirement of piezoelectric elements on the radiator. The aluminum bodies under investigation are the base part of the radiators with crimped feathers for the train industry. The surface of the aluminum plate part was milled using three different milling strategies: along of longer or shorter side of workpiece and at an angle of 45°. The aluminum bodies were machined on milling centre ecoMILL 70 DMG MORI. The flatness deviation measurements were carried out on the Coordinated Measuring Machine Altera 7.5.5 Nikon Metrology NV. These measurements were made during the manufacturing process of the radiator, namely after machining, however, before the process crimping of feathers. The results that were obtained enables the validation of assumed milling path strategies in connection of the subsequent machining and assembly processes.
The Effect of Full-Cell Impregnation of Pine Wood (Pinus sylvestris L.) on Changes in Electrical Resistance and on the Accuracy of Moisture Content Measurement Using Resistance Meters
- Aleksandra Konopka
- Jacek Barański
- Kazimierz Orłowski
- Karol Szymanowski
2018 Full text BIORESOURCES
The impact of the full-cell impregnation of pine wood was investigated with respect to changes in electrical resistance and the accuracy of moisture content measurement. This study compared the resistance of impregnated and untreated pine timber harvested from the northern part of Poland (Pomeranian region). The wood was impregnated by the vacuum-pressure method. The preservative (TANALITH E 3475) and coloring (TANATONE 3950) agents were based on copper salts. The results showed a dependence of wood resistance as a function of the moisture content. Impregnated and not treated wood samples were used. This result reflects the greater conductivity of the impregnate solution (based on copper salt) than the water. This phenomenon became more distinctive as moisture content value was above the Fiber Saturation Point (FSP).
The effect of full-cell impregnation of pine wood (Pinus Sylvestris L.) on the fine dust content during sawing on a frame sawing machine
- Kazimierz Orłowski
- Daniel Chuchała
- Ladislav Dzurenda
2018 Full text Trieskove a Beztrieskove Obrabanie Dreva
In this paper the results of the analysis of the effect of the impregnation treatment of pine wood on the granularity of sawdust from the sawing process on the frame sawing machine PRW 15M are presented. Granulometric analyses of chips from impregnated and unimpregnated pine wood implies that the impregnation of pine wood does not affect the size and structure of the sawdust produced. A major ≈ 95% share of the formed chips is the coarse and thick coarse fractions at a grain range of 125 μm to 2 mm. The slight difference is in the fraction of the fine fraction with a particle size of 32 - 125 μm. While the share of pine wood sawdust of unimpregnated wood is between 0.48 and 0.8%, and of the impregnated wood pine wood is 0.68 - 1.1%. This fact does not affect the efficiency of separation in fabric filters and the technological use of sawdust in the production of briquettes and pellets.