2019 - Repozytorium publikacji - Politechnika Gdańska

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The overview of reactors used for the production of precipitated calcium carbonate via carbonation route
- Natalia Czaplicka
- Donata Konopacka-Łyskawa
2019 Pełny tekst Aparatura Badawcza i Dydaktyczna
Carbonation is one of the methods for the production of precipitated calcium carbonate (PCC) on the industrial scale. A gaseous CO2 is used as a reagent in this process. The hydrodynamic conditions gener-ated in the reactor affect the course of the process and the characteristics of the precipitated calcium carbonate particles. This paper discusses the construction of standard reactors and new proposed con-struction used for the synthesis of calcium carbonate and presents the effect of precipitation conditions in selected reactors on the characteristics of PCC particles.
The Performance of ASON/GMPLS Network with Hierarchical Control Plane Structure
- Sylwester Kaczmarek
- Magdalena Młynarczuk
2019
The paper regards the problem of ASON/GMPLS network performance with hierarchical control plane structure in condition of incomplete domain network information. The authors propose the hierarchical ASON/GMPLS control plane architecture, which fulfills the requirements of modern optical networks and allows to control the multidomain network with requirement quality of service. The authors examine the scalability and properties of hierarchical control plane structure in order to indicate which parameters have significant impact on required quality of service. The analysis is performed with simulation method by using OMNeT++ discrete-event simulator. Obtained results are compared with results for flat control plane architecture.
The possibility of estimating the height of the ionospheric inhomogeneities based on TEC variations maps obtained from dense GPS network
- Grzegorz Nykiel
- Yevgen M. Zanimonskiy
- Aleksander Koloskov
- Mariusz Figurski
2019 ADVANCES IN SPACE RESEARCH
A state of the ionosphere can be effectively studied using electromagnetic signals received from global navigation satellite systems (GNSS). Utilization of the dual frequency observations allows estimating values of the total electron content (TEC). They can be used for a number of scientific studies such as detection and monitoring of traveling ionospheric disturbances or plasma bubbles. Moreover, maps of TEC variations allow to classify ionospheric heterogeneities and to evaluate their parameters. However, most of the research describes ionospheric parameters only in 2D space and time. In this paper, we focus on the determination of the height of the ionospheric inhomogeneities. We used a dense network of GPS receivers to obtain the sequences of TEC variation maps for different heights of the ionospheric layer. For each satellite observed above 70 deg, we constructed separate sets of maps. For each ionospheric height, the crosscorrelation function between maps corresponding to different satellites was calculated. The biggest cross-correlation coefficient value determines the height of the ionospheric irregularities. This paper describes the methodology and the results obtained for a geomagnetic storm on St. Patrick’s Day in March 2013. We have found that in quiet geomagnetic conditions the ionospheric irregularities are localized predominantly within the interval 180–220 km close to the maximum of the ionospheric F2 layer. In disturbed conditions, the height of their localization was increased up to several hundreds of kilometers. These estimations correspond to the changes in the slab thickness of the ionosphere.
The potential of LC–MS technique in direct analysis of perfume content
- Dagmara Kempińska-Kupczyk
- Agata Kot-Wasik
2019 Pełny tekst MONATSHEFTE FUR CHEMIE
Perfumes are products that consist of a wide range of natural and synthetic compounds. Due to complex composition, the determination of their ingredients is a difficult task. Most of the perfume components are either volatile or semi-volatile; however, most of the attention has been paid to volatile ones, and thus, gas chromatography or electronic noses are generally used. Nevertheless, in this study, liquid chromatography coupled with mass spectrometry has been applied for direct perfume analysis. Four samples of different best-selling perfumes (two men’s and two women’s fragrances) and their counterfeits were taken under consideration. The identification of their ingredients was performed by combining obtained results with information available in on-line databases. Compounds specific to essential oils and carrier oils, antioxidants and dyes were generally detected in both types of samples, whereas components of the fragrance of animal origin were only found in brand-name perfumes. On the other hand, counterfeits contained more types of polymer emulsifiers. Therefore, based on the results obtained, it can be concluded that liquid chromatography coupled with very sensitive detection technique can be used as a complementary approach to analyses performed with gas chromatography. Moreover, this technique offers the possibility to determine compounds that have low thermostability.
The potential of urban agriculture in the revitalisation of a metropolis
- Gabriela Maria Rembarz
2019
In Poland, the topic addressing urban areas of agricultural production and gardening activity is still viewed in two main blocks: 1) a shift of the urbanized zone’s boundaries, causing dispersion of suburban buildings as well as creates conflict zone between the residential area and the production and post-production zones; 2) a socially contentious issue of restructuring the inner-city complexes of former employee allotments. The article develops a conversation with the third block – urban gardening, understood as a revitalization tool – introducing a discussion on the city’s potentials, a perspective for alternative developmental scenarios within a metropolitan area. Threads of a metropolitan policy SMART have been collated with developmental potentials of the ‘slow life’ attitude and philosophy. The thesis was supported by the results of a study-research project titled: “SlowSmartOrunia: SlowLife in SmartCity”, carried out in the form of urban mentoring. Metropolization in Poland is plane of urban debate which revises the region-city-village relation. Urban agriculture has been the password triggering revision of the current modernization and development paradigm. The paste 25 years of the organizational and spatial changes implies the urban community’s growing interest in the SLOW mainstream. It combines unexpired Polish tradition with a new trends of western metropolises. Redefinition of the developmental targets and the methods, striving to reduce stress resulting from accelerations in technological and economic development. The need to maintain a secure sustainability in social development, responsible for the so-called urban resilient, that is, flexible resistance to the changes in developmental conditions. Smart City, while improving communication between the residents, should open developmental channels of new forms of codecision-making (creative planning and governance) and co-responsibility adequate to the contemporary pace and lifestyle. Mobilization of the city’s newly developed endogenic potential is meant to increase all the parameters hidden under the term ‘sustainable development’. Alternative strategies implemented in order to strengthen the social and cultural capital, here, gain special importance. Urban forms of plant cultivation, as tools for strengthening communities, are perceived as the symbol of change.
The preferable ways of decision-making in IT teams
- Beata Krawczyk-Bryłka
- Henryk Krawczyk
2019 Pełny tekst Decision Making in Manufacturing and Services
Software development team collaboration requires various decisions regarding essential aspects of a project’s progress. General and particular decision-making models are considered, and their main aspects such as team types, problem solving categories, and decision-making ways are analyzed. The research concerns representative groups of IT specialists and their preferences in decision-making are investigated. Four possible cases were tested: hierarchical choice (by leader) team members’ choice (team consensus or voting) and external expert impact. It allows one to show some differences in the behaviors of both traditional and virtual teams.
The principles of arturbain.fr for teaching sustainable urban design
- Izabela Burda
- Małgorzata Dymnicka
2019 Pełny tekst World Transactions on Engineering and Technology Education
The article is an attempt to show how important it is in the contemporary education of architecture students to use an ordered repertoire of principles and concepts of a universal nature, at the same time, pointing to the new directions of solutions and answers to the problems of the 21st century. This task is implemented by the French Association L'Arturbain dans les Territoires. It is accompanied by an idea consisting in observing a few basic principles in urban planning: learn to look, learn to get to know vocabulary, learn to cultivate memory, learn to work in a multi-disciplinary team, learn to communicate. Adopting an attitude thus defined towards the built environment implies undertaking specific actions for the recovery of public space, the restoration of landscape diversity, of socio-cultural identity, and the protection of the natural environment.
The Production Possibility of the Antimicrobial Filaments by Co-Extrusion of the PLA Pellet with Chitosan Powder for FDM 3D Printing Technology
- Szymon Mania
- Jacek Ryl
- Jia-Rong Jinn
- Ya-Jane Wang
- Anna Michałowska
- Robert Tylingo
2019 Pełny tekst Polymers
The last decades have witnessed a major advancement and development in three-dimensional (3D) printing technology. In the future, the trend’s utilization of 3D printing is expected to play an important role in the biomedical field. This work presents co-extrusion of the polylactic acid (PLA), its derivatives (sPLA), and chitosan with the aim of achieving filaments for printing 3D objects, such as biomedical tools or implants. The physicochemical and antimicrobial properties were evaluated using SEM, FT-IR, DSC, instrumental mechanical test, and based on the ASTM E2149 standard, respectively. The addition of chitosan in the PLA and sPLA filaments increased their porosity and decreased density. The FT-IR analysis showed that PLA and chitosan only formed a physical mixture after extrusion. The addition of chitosan caused deterioration of the mechanical properties of filaments, especially elongation at break and Young’s modulus. The addition of chitosan to the filaments improved their ability to crystallize and provide their antimicrobial properties against Escherichia coli and Staphylococcus aureus.
The protocol for using elastic wall model in modeling blood flow within human artery
- Marcin Nowak
- Bartłomiej Melka
- Marek Rojczyk
- Maria Gracka
- Andrzej J. Nowak
- Adam Golda
- Wojciech P. Adamczyk
- Benjamin Isaac
- Ryszard A. Białecki
- Ziemowit Ostrowski
2019 EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
Medical diagnostic tools will play a major role in the future for an effective patient treatment and reduction their mortality, related to the cardiovascular system diseases (CVDs). There is an urgent need for developing diagnostic procedure to be robust, reliable, accurate and efficient, in the framework of a paradigm shift. Application of numerical techniques is seen as a perspective tool for such purpose. Nevertheless, existing models need constant improvement in development robust, multi-scale models. This paper elaborates on the development of numerical model for modeling blood flow in the aorta section. The deformation of the blood vessel was modeled as two-way fluid–structure interaction (FSI) using ANSYS package. Numerical results have shown that the developed model predicts deformations of the vessels and describes their impact on the pressure, pressure drop and wall shear stresses distributions. Differences between rigid and deformed walls were checked based on pressure drop value. For movable walls, these values were higher both for systole and diastole, which is caused by the local wall compression during aforementioned moments of the cycle. The significant backflow observed during the heart cycle is connected with the deformed walls resulting in temporal blood accumulation. The maximum total deformation of the vessel walls achieved 2.35 mm, and the difference between the maximum and minimum blood volume was equal 5.2%.
The relationship between phytochemical composition and biological activities of differently pigmented varieties of berry fruits; Comparison between embedded in food matrix and isolated anthocyanins.
- Izabela Koss-Mikołajczyk
- Barbara Kusznierewicz
- Agnieszka Bartoszek-Pączkowska
2019 Pełny tekst Foods
The aim of this research was to correlate the composition of phenolic compounds and bioactivities (antioxidant, cytotoxic, antigenotoxic, and influence on selected enzymatic activities) exhibited by extracts from differently pigmented raspberry (yellow and red), grape (white and red), mulberry (white and black), and currant (white, red, and black) varieties. It was presumed that phytocomplexes of the same species will be similar while differing significantly only by the content of anthocyanins in colored varieties, which will impact biological properties. Additionally, to compare food matrix embedded and isolated anthocyanins, the influence of purified solution, in concentrations matching the total concentration of anthocyanins in appropriate colored plant samples, on investigated biological activities was studied. The phenolic compound composition and antioxidant profiles showed that anthocyanin content was correlated only with antioxidant capacity of tested plant extracts. The other determined biological activities failed to reveal any simple relationship between chemopreventive potential and anthocyanin composition in fruits studied nor any similarity to biological properties of isolated cyanidin-3-O-glucoside. These observations indirectly support the food synergy concept, that points to interactions between different phytochemicals as a factor deciding about the final bioactivity of edible plants.
The resilient city in architectural engineering education: a joint design studio between Gdańsk and Chalmers universities of technology
- Magdalena Rembeza
- Dorota Dominika Kamrowska-Załuska
2019 Pełny tekst World Transactions on Engineering and Technology Education
Challenges to society, such as those posed by climate change require a new approach to the education of the engineer-architect. Contemporary solutions should serve future generations and that is why the idea of the resilient city should be discussed and implemented, both in theory and in practice. It is necessary to teach students to design urban structures in such a way that they are resilient to dynamically changing conditions. In this article, the authors have presented a new teaching model based on international co-operation: a joint design studio. In presenting opportunities, the authors have also identified challenges of this new approach based on their experience over three years of co-operation between Gdańsk University of Technology (GUT), in Gdańsk, Poland and Chalmers University of Technology (CUT), in Göteborg, Sweden. This teaching format could be a valuable instrument in the education of future engineers-architects. If properly implemented, it could also be beneficial for cities during the participatory design process.
The Role of Electron Transfer in the Fragmentation of Phenyl and Cyclohexyl Boronic Acids
- Ana Lozano
- Beatriz Pamplona
- Tymon Kilich
- Marta Łabuda
- Mónica Mendes
- João Pereira-da-Silva
- Gustavo García
- Pedro Gois
- Filipe Ferreira Da Silva
- Paulo Limão-Vieira
2019 Pełny tekst INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
In this study, novel measurements of negative ion formation in neutral potassium-neutral boronic acid collisions are reported in electron transfer experiments. The fragmentation pattern of phenylboronic acid is comprehensively investigated for a wide range of collision energies, i.e., from 10 to 1000 eV in the laboratory frame, allowing some of the most relevant dissociation channels to be probed. These studies were performed in a crossed molecular beam set up using a potassium atom as an electron donor. The negative ions formed in the collision region were mass analysed with a reflectron time-of-flight mass spectrometer. In the unimolecular decomposition of the temporary negative ion, the two most relevant yields were assigned to BO− and BO2−. Moreover, the collision-induced reaction was shown to be selective, i.e., at energies below 100 eV, it mostly formed BO−, while at energies above 100 eV, it mostly formed BO2−. In order to further our knowledge on the complex internal reaction mechanisms underlying the influence of the hybridization state of the boron atom, cyclohexylboronic acid was also investigated in the same collision energy range, where the main dissociation channel yielded BO2−. The experimental results for phenyl boronic acid are supported by ab initio theoretical calculations of the lowest unoccupied molecular orbitals (LUMOs) accessed in the collision process.
The role of stakeholders on rejection of bankruptcy applications in the case of “poverty” of the estate: A Polish case study
- Błażej Prusak
- Sylwia Morawska
- Joanna Kuczewska
- Przemysław Banasik
2019 International Insolvency Review
The aim of this article is to supplement the Law and Economics area of science with regard to the scope of the ex ante effectiveness of bankruptcy law using the example of Poland. Bankruptcy law is effective in the ex ante stage when it eliminates from the market insolvent entrepreneurs who cannot even afford to cover the costs of bankruptcy proceedings. In these cases, the bankruptcy court should dismiss the petition for bankruptcy because of “poverty” of the insolvent estate. As a result, the insolvent debtor should be liquidated and deleted from the register of companies. This paper investigates entities whose bankruptcy petition has been rejected due to “poverty” of the insolvent estate. The study shows that, after the filing has been dismissed, the majority of these entities are not liquidated. To determine who is responsible for this state of affairs, the article identifies the stakeholders at the time that applications are filed for bankruptcy proceedings and also after the bankruptcy petition has been rejected. The article highlights stakeholders' diverging interests, strengths, and weaknesses to assess their potential impact on bankruptcy procedures that should be dismissed due to “poverty” of the insolvent estate.
The saga of a fish: from a survival guide to closing lemmas
- Sergey Kryzhevich
- Eugene Stepanov
2019 Pełny tekst JOURNAL OF DIFFERENTIAL EQUATIONS
In the paper by D. Burago, S. Ivanov and A. Novikov, “A survival guide for feeble fish”, it has been shown that a fish with limited velocity can reach any point in the (possibly unbounded) ocean provided that the fluid velocity field is incompressible, bounded and has vanishing mean drift. This result extends some known global controllability theorems though being substantially nonconstructive. We give a fish a different recipe of how to survive in a turbulent ocean, and show its relationship to structural stability of dynamical systems by providing a constructive way to change slightly the velocity field to produce conservative (in the sense of not having wandering sets of positive measure) dynamics. In particular, this leads to the extension of C. Pugh’s closing lemma to incompressible vector fields over unbounded domains. The results are based on an extension of the Poincaré recurrence theorem to some σ -finite measures and on specially constructed Newtonian potentials.
The significance of institutions' potential to increase Youth civic participation – case study of the South Baltic Youth Core Groups Network Project
- Izabela Borucińska
2019 Pełny tekst Regional Formation and Development Studies
Young people are a very important group of modern societies, they will replace the currently ruling generation and will shape our common future. Due to that, young people have become the relevant target of national and international policy and science researches. Youth civic participation is a key aspect of the development of a society and should be shaped by effective youth policy at the national and international levels. This paper is an attempt of determining the capacity of public institutions and non-government organizations to develop youth civic participation in the context of the Euro-pean Union youth policy. It reveals the importance of various elements of the potential of institutions’ environment in increasing civic participation of young people on the example of the South Baltic Youth Core Groups Network project which is implemented within the South Baltic Program 2014–2020. The project’s partnership is represented by entities from Denmark, Lithuania, Poland, and Sweden in which the quantitative research was carried out on civic participation of young people aged 14–24. The initial survey results have allowed confirming the hypothesis: the potential of the institutional environment of youth is not fully exploited in the process of increasing civic participation of young people in municipalities involved in the South Baltic Youth Core Groups Network Project. The research has revealed the strengths and weaknesses and barriers and opportunities of public institutions and non-government organizations to enhance youth civic participation in project partner countries
The significance of proximity in cluster initiatives
- Anna Lis
2019 Pełny tekst Competitiveness Review
Purpose – The main aim of this paper is to analyse relations between geographical and competence proximity and development of cooperation in cluster initiatives. Design/methodology/approach – The research was based on an original theoretical concept referring to the trajectory of development of cooperative relations in cluster initiatives. The research was carried out in mid-2017, in four purposefully selected clusterinitiatives. The research sample was 132 cluster enterprises. The main research strategy involved non-experimental models; the basic method of data collection was an online questionnaire. Findings – The results indicated that the role of geographical and competence proximity depends on the level of cooperation in a cluster initiative. In both these dimensions, proximity was important during the initial stage of cluster development: to start cooperation between the members, however, when more mature forms of cooperation were undertaken, the factor of common location was not so crucial any longer. It was also recommended to maintain some competence distance between the partners. Research limitations/implications – The main limitations referred to the static character of the data, the use of original measurement tools which had not been tested before, the small and little differentiated research sample and the subjective nature of the research. The above-mentioned limitations should be viewed as a starting point for further empirical research. Practical implications – Knowledge on the significance of geographical and competence proximity at various levels of cooperation in clusters is valuable for efficient management of a cluster and for higher competitiveness that it can achieve. Originality/value – The research study contributes to literature which refers to the question of proximity in clusters through the analysis of relations between geographical and competence proximity and development of cooperation in cluster initiatives. The results of the research point out that the role of geographical and competence proximity evolves with development of cooperation in cluster initiatives.
The smartest location for an eco-district– investigation of urban spatial energy efficiency
- Julia Kurek
- Justyna Martyniuk-Pęczek
2019
ncreasing awareness concerning environmental aspects of spatial and architectural planning led to more deliberated projects of eco-districts. Located all over the world and constantly being improved, apart from excellent energetical parameters, most of them have one specific characteristic in common, which is location in the outskirts. The aim of this article was to understand the importance of ecological district location depending on the distance from the city center and spatial energy efficiency parameters. For this purpose, the method of spatial analyses and settlements energy efficiency calculations were conducted. Five characteristic areas of the city were chosen for tests within the agglomeration of Polish Tricity, depending on the centrality level. In each of the areas, the same experimental ecological building complex was placed for the needs of research. As a result, following parameters of spatial energy efficiency were obtained for each location: total energy demand, carbon dioxide lifecycle emissions and ecological footprint. The outcomes were juxtaposed and performed in comparative analysis. This research approach respected both energy performance of single buildings and factors related to electricity, municipal services and infrastructure along with inhabitants’ mobility. The results from this study indicated that the location of ecological building complexes-often largely selfsufficient, is of such a considerable significance. The research supports the thesis that there is an importance of existing transport, municipal infrastructure, services and related aspects dependent on the location. © GSTF 2019.
The Spatial Structure of Suburban Zones in Selected Entrepreneurship Nets of the Tricity Metropolitan Area
- Justyna Martyniuk-Pęczek
- Grzegorz Pęczek
2019
The chapter describes spatial structures and forms of Polish suburban zones shown on the example of two selected towns in the Trojmiasto Metropolitan Area (TMA). The description of the spatial characteristics in the urban sprawl, with focus on the entrepreneurships nests is illustrated by the choice of typological features, such as: form, land use, density. Suburbanisation is described to be global, however one can observe individual characteristics of the spatial structure of suburban areas, depending on country and region. As widely discussed, urban sprawl has a range of negative consequences. There are several known approaches to the urban sprawl description, based on the form, land use and density. There are also publications regarding its relation to the environment impact, social aspects and regional development. However, there are very few publications on the topic regarding countries, who have undergone substantial political, economic and social transformations in the last 25 years. The previous research by the Authors shows, that the Polish dimension of suburbanization has a unique quality connected to the small and medium enterprises (SMEs) activity. The paper takes into consideration impact of this quality on the processes on suburbanization with special focus on the urban form of the suburban areas. The choice of the towns and places for the spatial structure analysis follows the previously done identification of the entrepreneurships nests. Conclusions refer to the qualitative studies conducted by the questionnaire with the entrepreneurs in the selected areas. This paper is written within project UMO-2013/09/B/HS4/01175 financed by The National Science Centre in Poland.
The statistical impact of experimental result scatter of asphalt mixtures on their numerical modelling
- Cezary Szydłowski
- Jarosław Górski
- Marcin Stienss
- Łukasz Smakosz
2019 Pełny tekst MATEC Web of Conferences
The paper presents selected test results of asphalt mixture conducted in low temperatures. The obtained parameters are highly diverse. It concerns ultimate breaking loads, stiffness parameters related to Young's modulus but also the fracture course. Statistical analysis upon the results makes it possible to relevantly estimate the material-defining parameter values. Such a random approach leads to the mean values of breaking and fracture-triggering loads, dealing with their dispersion too. The estimated parameters allow to form appropriate numerical models of asphalt mixture specimens. This type of analysis supports the laboratory tests. The paper presents the authors' simplified model considering non-uniform material features. The results reflect the scatter of real laboratory test outcomes. In order to do so an algorithm to calibrate the numerical model parameters was created.
The study of Arduino Uno feasibility for DAQ purposes
- Robert Barański
- Marek Galewski
- Szymon Nitkiewicz
2019 Pełny tekst Diagnostyka
Using microcontroller systems becomes a routine in various measurement and control tasks. Their wide availability together with a huge potential of extending their functionality by additional modules allows developing advanced measuring and monitoring systems by non-specialists. However, using popular example codes often leads the user to pass over or not to be aware of the limitations of the system and drawing too far-reaching conclusions on the basis of incorrectly performed measurements This paper deals with the problem of choosing the right method for performing measurements using an acquisition system based on the budget Arduino UNO solution. The main assumption was to use the standard, widely available Arduino libraries. The work focuses on the scenario when data should be subject to time and frequency analysis in the later processing. The operating limits of the device were also determined depending on the data transmission method used.