2019 - Repozytorium publikacji - Politechnika Gdańska

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Container port expansion towards the sea in the context of maritime spatial planning
- Karolina Krośnicka
2019 Pełny tekst EUROPA XXI
The growth of ships causes a significant increase in demand for new port surfaces and demands for the depths of water bodies in the ports. Due to technological changes in the transshipment and development pressure ports lacks space and they move towards the sea with their activities. The paper discusses the reasons for the phenomenon of expansion of ports towards the sea and its effects on maritime spatial planning.
Context-Aware Indexing and Retrieval for Cognitive Systems Using SOEKS and DDNA
- Caterine De Silva Oliveira
- Cesar Sanin
- Edward Szczerbicki
2019 Pełny tekst Advances in Intelligent Systems and Computing
Visual content searching, browsing and retrieval tools have been a focus area of interest as they are required by systems from many different domains. Context-based, Content-Based, and Semantic-based are different approaches utilized for indexing/retrieving, but have their drawbacks when applied to systems that aim to mimic the human capabilities. Such systems, also known as Cognitive Systems, are still limited in terms of processing different sources of information (especially when structured in different ways) for decision making purposes. This issue becomes significantly greater when past information is retrieved and taken in account. We address this issue by proposing a Structuralized Context-Aware Indexing and Retrieval using Set of Experience Knowledge Structure (SOEKS) and Decisional DNA (DDNA). SOEKS and DDNA allow the creation of a multi-modal space composed of information from different sources, such as contextual, visual, auditory etc., in a form of a structure and explicit experiential knowledge. SOKES is composed by fields that allow this experiences to participate in the processes of similarity, uncertainty, impreciseness, or incompleteness measures and facilitate the indexing and retrieval of knowledge in Cognitive Systems.
Continuum wave functions for estimating the electric dipole moment: Calculation based on a multiconfiguration Dirac-Hartree-Fock approximation
- Paweł Syty
- Józef Eugeniusz Sienkiewicz
- Laima Radžiūtė
- Gediminas Gaigalas
- Pavel Rynkun
- Jacek Bieroń
2019 Pełny tekst PHYSICAL REVIEW A
The multiconfiguration Dirac-Hartree-Fock method is employed to calculate the continuum electron wave functions, which are then used to estimate their contribution to the atomic electric dipole moment (EDM) of 129Xe. The EDM arises from (P,T)-odd electron-nucleon tensor-pseudotensor and pseudoscalar-scalar interactions, the nuclear Schiff moment, the interaction of the electron electric dipole moment with nuclear magnetic moments, and atomic electric dipole matrix elements. In addition to being estimated in the continuum states, all of these interactions are also estimated in the ground state, as well as in the Rydberg states of 129Xe. Calculations of one-electron atomic orbitals include the interelectronic interactions, through valence and core-valence electron correlation effects. The contribution to the EDM from continuum states is found to be of the same order of magnitude as the contribution from discrete states.
Control of a vapour microturbine set in cogeneration applications
- Wojciech Włodarski
2019 Pełny tekst ISA TRANSACTIONS
Systems with microturbines are implemented for local generation of heat and electricity. This paper presents the analysis of control concepts for a vapour microturbine set with a generator with permanent magnets, intended to work in small heat and power plants. Control system variants differed by the selection of controlled signals and set parameters. Possible ways of control were discussed and compared with experimentally determined static characteristics of the microturbine set. The simulation calculations were performed to check the control systems operation in various expected operating conditions.
Co-operation with local stakeholders: a crucial element of urban design
- Anna Golędzinowska
- Małgorzata Kostrzewska
2019 Pełny tekst World Transactions on Engineering and Technology Education
In this article,the authors endeavour to illustratethe evolution of the role of local stakeholder in teaching urban planning by example of selected experiences in the Faculty of Architecture atGdańsk University of Technology(FA-GUT), Gdańsk, Poland. The timeframe covers the period from the political breakthrough in 1989 to the present. The background is composed of the social, economic and legal changes that have taken place over the years in Poland. The authors also attempt to identify the present local stakeholders; the value of co-operation for the education process; and the added value each can bring.
Copper and cobalt co-doped ceria as an anode catalyst for DIR-SOFCs fueled by biogas
- Beata Bochentyn
- Mikołaj Chlipała
- Maria Gazda
- Sea-Fue Wang
- Piotr Jasiński
2019 Pełny tekst SOLID STATE IONICS
The nanocrystalline compounds of Co and Cu co-doped ceria (with up to 20 mol.% of dopants) were fabricated by the reverse microemulsion synthesis method. They were deposited in a form of layers on the surface of SOFC anode in an aim to act as electrochemically active materials for biogas reforming process. Fourier Transformed Infrared Spectroscopy was used to analyze a composition of outlet gases simultaneously with the tests of electrical parameters of a fuel cell. It allowed comparing a catalytic activity of fabricated materials towards internal biogas reforming. It was found that Cu and Co ceria co-doping improves electrical parameters of a fuel cell and enhances its long-term stability when compared with mono-doped ceria. This type of a material gives also the highest conversion rate of methane and the highest yield of carbon monoxide.
Cops, a fast robber and defensive domination on interval graphs
- Dariusz Dereniowski
- Tomáš Gavenčiak
- Jan Kratochvíl
2019 Pełny tekst THEORETICAL COMPUTER SCIENCE
The game of Cops and ∞-fast Robber is played by two players, one controlling c cops, the other one robber. The players alternate in turns: all the cops move at once to distance at most one each, the robber moves along any cop-free path. Cops win by sharing a vertex with the robber, the robber by avoiding capture indefinitely. The game was proposed with bounded robber speed by Fomin et al. in “Pursuing a fast robber on a graph”, generalizing a well-known game of Cops and Robber which has robber speed 1. We answer their open question about the computational complexity of the game on interval graphs with ∞-fast robber, showing it to be polynomially decidable. We also generalize the concept of k-defensive domination introduced by Farley and Proskurowski in “Defensive Domination” to A--defensive domination and use it as a main tool in our proof. The generalization allows specifying arbitrary attacks and limiting the number of defenders of each vertex. While this problem is NP-complete even for split graphs, we show that A-defensive domination is decidable in polynomial time on interval graphs.
CORPORATE BANKRUPTCY PREDICTION IN POLAND AGAINST THE BACKGROUND OF FOREIGN EXPERIENCE
- Błażej Prusak
2019 Pełny tekst Financial Internet Quarterly
In highly developed countries, research in the field of bankruptcy risk prediction has been conducted for many years. For example, in the United States, which can be considered a pioneering country, the first publications appeared in the early twentieth century. In Poland, due to political and economic reasons, the interest in this issue dates back to the early 1990s. For this reason, this publication attempts to answer the following questions: 1) What is the level of advancement of the research into predicting bankruptcies of enterprises in Poland? 2) How does it compare to worldwide trends? Therefore, the main aim of this study is to present and evaluate the scientific achievements of Polish authors in the field of corporate bankruptcy prediction and compare them to global trends. Literature analysis was adopted as the research method and shows that initially in Poland only very simple tools were used to assess the risk of bankruptcy of enterprises. With time, however, advanced methods began to be introduced and new models included non-financial variables. Also, research on the selection of the samples was conducted. Currently, the level of research and applied tools do not differ from those used in highly developed countries.
CORPORATE BANKRUPTCY PREDICTION IN POLAND AGAINST THE BACKGROUND OF FOREIGN EXPERIENCE
- Błażej Prusak
2019 Pełny tekst Financial Internet Quarterly
In highly developed countries, research in the field of bankruptcy risk prediction has been conducted for many years. For example, in the United States, which can be considered a pioneering country, the first publications appeared in the early twentieth century. In Poland, due to political and economic reasons, the interest in this issue dates back to the early 1990s. For this reason, this publication attempts to answer the following questions: 1) What is the level of advancement of the research into predicting bankruptcies of enterprises in Poland? 2) How does it compare to worldwide trends? Therefore, the main aim of this study is to present and evaluate the scientific achievements of Polish authors in the field of corporate bankruptcy prediction and compare them to global trends. Literature analysis was adopted as the research method and shows that initially in Poland only very simple tools were used to assess the risk of bankruptcy of enterprises. With time, however, advanced methods began to be introduced and new models included non-financial variables. Also, research on the selection of the samples was conducted. Currently, the level of research and applied tools do not differ from those used in highly developed countries.
Corrosion Inhibition Mechanism and Efficiency Differentiation of Dihydroxybenzene Isomers Towards Aluminum Alloy 5754 in Alkaline Media
- Jacek Ryl
- Mateusz Brodowski
- Marcin Kowalski
- Wiktoria Lipińska
- Paweł Niedziałkowski
- Joanna Wysocka
2019 Pełny tekst Materials
The selection of efficient corrosion inhibitors requires detailed knowledge regarding the interaction mechanism, which depends on the type and amount of functional groups within the inhibitor molecule. The position of functional groups between different isomers is often overlooked, but is no less important, since factors like steric hinderance may significantly affect the adsorption mechanism. In this study, we have presented how different dihydroxybenzene isomers interact with aluminum alloy 5754 surface, reducing its corrosion rate in bicarbonate buffer (pH = 11). We show that the highest inhibition efficiency among tested compounds belongs to catechol at 10 mM concentration, although the differences were moderate. Utilization of novel impedance approach to adsorption isotherm determination made it possible to confirm that while resorcinol chemisorbs on aluminum surface, catechol and quinol follows the ligand exchange model of adsorption. Unlike catechol and quinol, the protection mechanism of resorcinol is bound to interaction with insoluble aluminum corrosion products layer and was only found efficient at concentration of 100 mM (98.7%). The aforementioned studies were confirmed with Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy analyses. There is a significant increase in the corrosion resistance offered by catechol at 10 mM after 24 h exposure in electrolyte: from 63 to 98%, with only negligible changes in inhibitor efficiency observed for resorcinol at the same time. However, in the case of resorcinol a change in electrolyte color was observed. We have revealed that the differentiating factor is the keto-enol tautomerism. The Nuclear Magnetic Resonance (NMR) studies of resorcinol indicate the keto form in structure in presence of NaOH, while the chemical structure of catechol does not change significantly in alkaline environment.
Corrosion Inhibition of Aluminium Alloy AA6063-T5 by Vanadates: Local Surface Chemical Events Elucidated by Confocal Raman Micro-Spectroscopy
- Dmitry Kharitonov
- Jens Sommertune
- Cem Örnek
- Jacek Ryl
- Irina Kurilo
- Per Claesson
- Jinshan Pan
2019 Pełny tekst CORROSION SCIENCE
Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V+4 and V+5 polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V+5 species are first reduced to V+4 or V+3 species above cathodic IMPs, and then oxidized to mixed-valence V+5/V+4 polymerized compounds.
Cost Analysis of Prefabricated Elements of the Ordinary and Lightweight Concrete Walls in Residential Construction
- Marzena Kurpińska
- Beata Grzyl
- Adam Kristowski
2019 Pełny tekst Materials
Global economic growth causes an increase in natural resources exploitation, particularly in construction branch. The growing use of electricity contributes to climate change. Therefore, it is necessary to search the solutions, which will allow for reducing natural resources exploitation. One of the many opportunities to do that is the application of the recycled materials. The authors of the given article have analyzed three variants of construction solutions. One of them was the production of the walls of a building from reinforced concrete prefabricates with styrofoam insulation layer. The second variant for analysis were prefabricated walls from lightweight concrete, made of sintered clay aggregate with a foam core. The third proposed variant was a system of multi-layered walls, which was made of lightweight concrete with granulated expanded glass aggregate (GEGA). The main objective of the research was to assess the use of lightweight GEGA prefabricates, focusing on economic and technological aspects of the solution. The authors have analyzed the entire construction costs; ceilings and stairs were assumed as reinforced concrete elements. In calculations, the weight of the elements was taken into account, as well as transportation and mounting costs. On the basis of this cost analysis, it was concluded that the use of prefabricated element, made of lightweight concrete with GEGA, could be a replacement for the solutions, widely applied until these days. The analysis has also shown that the use of prefabricates with GEGA is sensible from the economic viewpoint, as it allows for saving construction time. Moreover, the solutions, proposed here, allow for saving natural resources and assuming a more environmentally friendly and caring attitude.
Coupling of Blood Pressure and Subarachnoid Space Oscillations at Cardiac Frequency Evoked by Handgrip and Cold Tests: A Bispectral Analysis
- Marcin Gruszecki
- Yurii Tkachenko
- Jacek Kot
- Marek Radkowski
- Agnieszka Gruszecka
- Krzysztof Basiński
- Monika Waskow
- Wojciech Gumiński
- Jacek Anand
- Jerzy Wtorek
- Andrzej F. Frydrychowski
- Urszula Demkow
- Pawel Winklewski
2019 Advances in Experimental Medicine and Biology
The aim of the study was to assess blood pressure–subarachnoid space (BP–SAS) width coupling properties using time–frequency bispectral analysis based on wavelet transforms during handgrip and cold tests. The experiments were performed on a group of 16 healthy subjects (F/M; 7/9) of the mean age 27.2 ± 6.8 years and body mass index of 23.8 ± 4.1 kg/m². The sequence of challenges was first handgrip and then cold test. The handgrip challenge consisted of a 2-min strain, indicated by oral communication from the investigator, at 30% of maximum strength. The cold test consisted of 2 min of hand immersion to approximately wrist level in cold water of 4 °C, verified by a digital thermometer. Each test was preceded by 10 min at baseline and was followed by 10-min recovery recordings. BP and SAS were recorded simultaneously. Three 2-min stages of the procedure, baseline, test, and recovery, were analyzed. We found that BP–SAS coupling was present only at cardiac frequency, while at respiratory frequency both oscillators were uncoupled. Handgrip and cold test failed to affect BP–SAS cardiac–respiratory coupling. We showed similar handgrip and cold test cardiac bispectral coupling for individual subjects. Further studies are required to establish whether the observed intersubject variability concerning the BP–SAS coupling at cardiac frequency has any potential clinical predictive value.
Criteria for evaluation and selection of the best offer for the Contract Engineer service
- Beata Grzyl
- Magdalena Apollo
- Heyducki Igor
2019 Pełny tekst IOP Conference Series: Materials Science and Engineering
The purpose of the legal regulations regarding public procurement in EU countries is to ensure effective funds' spending. When assessing and selecting the best offer, the contracting entities have at their disposal many different criteria, including non-price criteria. Their proper selection and application is necessary to ensure the high quality of the ordered product, delivery or service. Making an order for intellectual services, including performed by the Contract Engineer (CE), should be based primarily on the criterion of qualifications and experience. The actions and decisions taken by CE are particularly important for the quality and timeliness of the contract. The purpose of the research is to indicate to what scope and extent the awarding entities in Poland use the possibility of a wide selection of different criteria for the evaluation of intellectual services, consisting of performing the CE function. On the basis of selected proceedings, the authors discuss the criteria for evaluation and selection of the best offer applied in practice, classify them, analyze and evaluate them. The results of the conducted research indicate that the price and experience are often used in practice as the CE selection criteria. The authors, however, give numerous examples of other criteria. In many cases, these criteria are difficult to verify at the stage of evaluating offers and enforcing them in practice in course of works, raising doubts as to their effectiveness, sometimes making it impossible to make a reliable assessment and select the most advantageous offer. The authors indicate that despite many possibilities offered by the legal status in force in Poland, in practice, in some cases, criteria that have a large impact on the increase of the proposed service price, but not reflected in its quality, apply. As a consequence, it results in the lack of effective spending of public funds.
Critical review of electronic nose and tongue instruments prospects in pharmaceutical analysis
- Wasilewski Tomasz
- Dorian Migoń
- Jacek Gębicki
- Wojciech Kamysz
2019 ANALYTICA CHIMICA ACTA
Electronic nose (enose, EN) and electronic tongue (etongue, ET) have been designed to simulate human senses of smell and taste in the best possible way. The signals acquired from a sensor array, combined with suitable data analysis system, are the basis for holistic analysis of samples. The efficiency of these instruments, regarding classification, discrimination, detection, monitoring and analytics of samples in different types of matrices, is utilized in many fields of science and industry, offering numerous practical applications. Popularity of both types of devices significantly increased during the last decade, mainly due to improvement of their sensitivity and selectivity. The electronic senses have been employed in pharmaceutical sciences for, among others, formulation development and quality assurance. This paper contains a review of some particular applications of EN and ET based instruments in pharmaceutical industry. In addition, development prospects and a critical summary of the state of art in the field were also surveyed.
Cross sections for electron collision with pyridine [C5H5N] molecule
- Czesław Szmytkowski
- Sylwia Stefanowska-Tur
- Natalia Tańska
- Bożena Żywicka
- Elżbieta Ptasińska-Denga
- Paweł Możejko
2019 MOLECULAR PHYSICS
The absolute grand -total cross section (TCS) for electron scattering from pyridine, C5H5N, molecules has been measured at impact energies from 0.6 to 300 eV in the linear electron-transmission experiment. The obtained TCS energy dependence appears to be typical for targets of high electric-dipole moment; the cross section generally decreases with rising energy, except for the 3–20 eV range, where a broad enhancement peaked near 8.5 eV is clearly visible. Below 10 eV, some weak structures which can be attributed to resonant scattering processes are also discernible. The present TCS energy dependence is compared with TCS experimental data reported very recently. Comparison with TCS for benzene is also made to search how the replacement of the CH group in the benzene ring with the nitrogen atom influences the electron-scattering process. In addition, for pyridine and its halogenated derivatives: 2-chloropyridine [2-C5H4ClN] and 2-bromopyridine [2-C5H4BrN], integral elastic (ECS) and ionisation (ICS) cross sections have been calculated at intermediate and high electron-impact energies within semiempirical approaches. For pyridine the sum of ECS and ICS is in reasonable agreement with the measured TCS above 40 eV.
Cross-Bonding of MV Cable Lines for Energy Losses Decrease
- Krzysztof Dobrzyński
- Zbigniew Lubośny
- Jacek Klucznik
- Dominik Falkowski
- Janusz Grala
- Sławomir Noske
2019 Pełny tekst Acta Energetica
Currently, almost all medium voltage cable lines (MV) operate with the return wires earthed at both ends of the cable. Such a way of operation causes that during normal states of operation as well as during disturbances, e.g. short-circuits, in the return wires induce currents whose values mainly depend on the currents flowing in the phase wires. These currents in normal operating states are a source of additional energy losses incurred in the MV cables. The effect can be decreased by the return wires cross-bonding or the phase wires transposition. The paper discusses the potential effects that can be achieved by use of the return wires cross-bonding or the phase wires transposition in the domestic grids.
Crossover from charge density wave stabilized antiferromagnetism to superconductivity in Nd1−xLaxNiC2 compounds
- Marta Roman
- Leszek Litzbarski
- Tomasz Klimczuk
- Kamil Kolincio
2019 Pełny tekst PHYSICAL REVIEW B
The path from the charge density wave antiferromagnet NdNiC2 to the noncentrosymmetric superconductor LaNiC2 is studied by gradual replacement of Nd by La ions. The evolution of physical properties is explored by structural, magnetic, transport, magnetoresistance, and specific heat measurements. With the substitution of La for Nd, the Peierls temperature is gradually suppressed, which falls within the BCS mean-field relation for chemical pressure with a critical concentration of xc=0.38. As long as the charge density wave (CDW) is maintained, the antiferromagnetic (AFM) ground state remains robust against doping and, despite a Néel temperature reduction, shows a rapid and sharp magnetic transition. Once the CDW is completely suppressed, intermediate compounds of the Nd1−xLaxNiC2 series reveal symptoms of a gradual softening of the features associated with the AFM transition and an increase of the spin disorder. Immediately after the antiferromagnetic transition is depressed to zero temperature, the further incorporation of La ions results in the emergence of superconductivity. This crossover in Nd1−xLaxNiC2 is discussed in terms of the possible quantum critical point.
Cross-talk Between the Heart and Arteries in Older 65+ Adults
- Tomasz Wierzba
- Stanisław Zajączkowski
- Paweł Figarski
- Robert Olek
- Artur Poliński
2019
Regulatory synchronization between the heart and the arterial walls is essential for optimal blood delivery to tissues. We investigated functional coherence between heart rhythm and aortic wall compliance in 30 volunteers aged 65 – 74. ECG and carotid and iliac pulse-wave were recorded and digitized at 2 kHz. Carotid-femoral pulse-wave transit time (cfTT) which reflex aortic compliance was assessed using the intersecting tangent algorithm at time-point of the maximal upstroke of the second derivative of the filtered pulse signal. Time-series of 256 heart cycles were used for heart rate variability (HRV) and cfTT variability analysis. Averaged power spectral density (aPSD) was estimated within selected frequency ranges by fast Fourier transform (FFT) approach. Magnitude squared coherence (MSC) between the both spectra was estimated. All volunteers exhibited variable temporal patterns of both HRV and cfTT variability. aPSD was reduced along with decreasing of time-window from 60 to 240 s. High coherent states between HRV and cfTT variability were observed as a short time prominent MSC peaks in almost all participants. Individual patterns of irregular MSC changes in time but not a generalized model of its fluctuations seem to reflect dynamic functional interaction between the heart and aortic compliance at an advanced age.
Crowdsourcing-Based Evaluation of Automatic References Between WordNet and Wikipedia
- Julian Szymański
- Tomasz Maria Boiński
2019 Pełny tekst INTERNATIONAL JOURNAL OF SOFTWARE ENGINEERING AND KNOWLEDGE ENGINEERING
The paper presents an approach to build references (also called mappings) between WordNet and Wikipedia. We propose four algorithms used for automatic construction of the references. Then, based on an aggregation algorithm, we produce an initial set of mappings that has been evaluated in a cooperative way. For that purpose, we implement a system for the distribution of evaluation tasks, that have been solved by the user community. To make the tasks more attractive, we embed them into a game. Results show the initial mappings have good quality, and they have also been improved by the community. As a result, we deliver a high quality dataset of the mappings between two lexical repositories: WordNet and Wikipedia, that can be used in a wide range of NLP tasks. We also show that the framework for collaborative validation can be used in other tasks that require human judgments.