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Gdańsk University of Technology

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Publications from the year 2019

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  • 100-lecie powstania Bauhausu: 1919-2019
    • Małgorzata Kostrzewska
    • Bartosz Macikowski
    2019 Full text Pismo PG

    Celem artykułu jest przypomnienie setnej rocznicy powstania szkoły wzornictwa i architektury Bauhaus. Uczelnia powstała w Dessau i miała ogromny wpływ na rozwój nowoczesnej sztuki - malarstwa, architektury i wzornictwa. Autorzy artykułu przygotowali wystawę poświęconą 100-leciu Bauhausu, która była prezentowana w murach Politechniki Gdańskiej. W artykule wykorzystano fotografie i materiały z tej wystawy. Wystawa i artykuł powstały dzięki wyjazdowi studialnemu do Dessau autorów wraz ze studentami Wydziału Architektury PG.

  • 11 Triennale Małych Form Malarskich
    • Krzysztof Wróblewski
    2019

    Triennale Małych Form Malarskich to cykliczny ogólnopolski konkurs zwieńczony wystawą, prezentujący poszukiwania artystów w dziedzinie kameralnej twórczości malarskiej we wszystkich jej odmianach. Organizatorzy pozostawiają malarzom pełną swobodę w wyborze techniki i tematu. Jedyne ograniczenie stanowią wymiary pracy – jej format nie może przekraczać 600 cm2. „Ograniczenie formatowe stawia przed artystami zadanie poszukania nowych rozwiązań malarskich oraz stworzenia dzieła skondensowanego i treściwego. Akceptujemy wszelkie propozycje, byle nie stały w sprzeczności z regulaminem. Każda edycja konkursu dostarcza szeregu prac niekonwencjonalnych, zrealizowanych z pomysłem, wywołujących żywą reakcję. Mały format, sprzyjający refleksji i metaforze, to doskonałe pole do eksperymentu” – podkreśla kuratorka aktualnej edycji Triennale, Joanna Gwiazda. Spośród 1497 prac 580 autorów zgłoszonych do 11. Triennale Małych Form Malarskich jury do wystawy pokonkursowej zakwalifikowało 302 prace 165 artystów. Przyznało także nagrody regulaminowe i fundowane.

  • 25 years of research and experiences about the application of constructed wetlands in southeastern Poland
    • Krzysztof Jóźwiakowski
    • Michał Marzec
    • Alina Kowalczyk-Juśko
    • Magdalena Gizińska-Górna
    • Aneta Pytka-Woszczyło
    • Arkadiusz Malik
    • Agnieszka Listosz
    • Magdalena Gajewska
    2019 ECOLOGICAL ENGINEERING

    This paper is a review of research and experiences related to the application of constructed wetland systems (CWs) in southeastern Poland in 1992–2016. On the basis of literature data, a comparison between pollutant removal efficiencies of one-stage and hybrid CWs was made. Some problems regarding the operation of these treatment plants were also presented. Data from various facilities indicate that one-stage CWs with horizontal or vertical flow were characterised by a quite high (80–89%) efficiency of removal of BOD5, COD and total suspended solids, but were less efficient in removing of biogenic compounds nitrogen and phosphorus – respectively 59 and 66%. Significantly higher removal efficiencies for the basic pollutants (above 92%) were observed in hybrid CWs with a VF–HF bed configuration. Those facilities removed ca. 65% of total nitrogen and 89% of total phosphorus. A statistical analysis revealed that hybrid VF–HF type CWs were characterised by a very high, about 99%, operation reliability. Lower reliabilities were achieved by one-stage CWs, especially those with a VF bed. Twenty five years of research on and experiences in the application of CWs in southeastern Poland indicate that one-stage CWs can be used on a larger scale in Polish conditions in rural areas with a scattered housing structure. Hybrid systems, on the other hand, can be applied successfully in recreational centres or in protected areas, especially in national parks, where a high pollutant removal efficiency is required. It has been shown that the use of hybrid CWs is consistent with the idea of sustainable development.

  • 2-Coloring number revisited
    • Robert Janczewski
    • Paweł Obszarski
    • Krzysztof Turowski
    2019 Full text THEORETICAL COMPUTER SCIENCE

    2-Coloring number is a parameter, which is often used in the literature to bound the game chromatic number and other related parameters. However, this parameter has not been precisely studied before. In this paper we aim to fill this gap. In particular we show that the approximation of the game chromatic number by the 2-coloring number can be very poor for many graphs. Additionally we prove that the 2-coloring number may grow quadratically as a function of the maximum degree of a graph, whereas the game chromatic number is always at most linear. Moreover, we establish the values of the 2-coloring number for several graph classes, such as complete k-partite graphs, cacti and thorny graphs, trees and subcubic graphs. It is shown that in all these cases one may compute the exact value in a polynomial time.

  • 2-D constitutive equations for orthotropic Cosserat type laminated shells in finite element analysis
    • Jacek Chróścielewski
    • Agnieszka Sabik
    • Bartosz Sobczyk
    • Wojciech Witkowski
    2019 Full text COMPOSITES PART B-ENGINEERING

    We propose 2-D Cosserat type orthotropic constitutive equations for laminated shells for the purpose of initial failure estimation in a laminate layer. We use nonlinear 6-parameter shell theory with asymmetric membrane strain measures and Cosserat kinematics as the framework. This theory is specially dedicated to the analysis of irregular shells, inter alia, with orthogonal intersections, since it takes into account the drilling rotation degree of freedom. Therefore, the shell is endowed naturally with 6 degrees of freedom: 3 translations and 3 rotations. The proposed equations are formulated from the statement of the generalized Cosserat plane stress with additional transverse shear components and integrated over the shell's thickness using the equivalent single layer approach (ESL). The resulting formulae are implemented into the own Fortran code enabling nonlinear shell analysis. Some numerical results are presented to show the performance of the proposed approach.

  • 30 lat galerii Milano
    • Krzysztof Wróblewski
    2019

    Wystawa zorganizowana na 30. Galerii Milano - najstarszej istniejącej prywatnej galerii sztuki w Warszawie- jest wyrazem podziękowania za wiele lat współpracy, zaangażowania, wzajemnego wsparcia i przyjaźni, zarówno z artystami jak i jej klientami. Wydarzenie uhonoruje wiele znakomitych nazwisk świata sztuki. Ekspozycja obejmie najnowsze prace przygotowane na jubileusz przez 70 autorów.

  • 3D Hierarchical Boron-Doped Diamond-Multilayered Graphene Nanowalls as an Efficient Supercapacitor Electrode
    • Debosmita Banerjee
    • Sankaran Kamatchi
    • Deshmukh Sujit
    • Mateusz Ficek
    • Bhattacharya Gourav
    • Jacek Ryl
    • Deodatta Maheshwar Phase
    • Mukul Gupta
    • Robert Bogdanowicz
    • I-Nan Lin
    • Aloke Kanjilal
    • Ken Haenen
    • Susanta Sinha Roy
    2019 Full text Journal of Physical Chemistry C

    Synthesis of stable hybrid carbon nanostructure for high-performance supercapacitor electrode with long life-cycle for electronic and energy storage devices is a real challenge. Here, we present a one-step synthesis method to produce conductive boron-doped hybrid carbon nanowalls (HCNWs), where sp2-bonded graphene has been integrated with and over a three-dimensional curved wall-like network of sp3-bonded diamond. The spectroscopic studies such as X-ray absorption, Raman, and X-ray photoelectrons clearly reveal the coexistence of diamond and graphene in these nanowalls, while the detailed transmission electron microscopy studies confirm the unique microstructure where a diamond nanowall is encased by a multilayered graphene. Interestingly, these HCNWs yield a high double layer capacitance value of 0.43 mF cm–2 and electrode retention of 98% over 10 000 cycles of charging/discharging in 1 M Na2SO4 electrolyte. The remarkable supercapacitive performance can be attributed to the 3D interconnected network of diamond nanowalls surrounded by highly conducting graphene.

  • 3-phase medium frequency transformer for a 100kW 1.2kV 20kHz Dual Active Bridge converter
    • Piotr Dworakowski
    • Andrzej Wilk
    • Michał Michna
    • Bruno Lefebvre
    • Thomas Lagier
    2019 Full text

    The article presents a three-phase Medium Frequency Transformer being a part of a 100kW 1.2kV 20kHz Dual Active Bridge DC-DC converter. The transformer design is detailed focusing on winding and core power loss calculation. The high power three-phase MFT prototype is presented. The experimental results include the transformer impedance characteristics, no load test and three-phase DAB full load test waveforms

  • 5G Technologies in Intelligent Transport Systems - Architectures, Virtualization and Network Slicing
    • Sławomir Gajewski
    2019 Archives of Transport System Telematics

    In the paper, 5G communication technologies implemented for Intelligent Transport Systems are discussed. Firstly, the essence of the 5G system concept is presented, and the problem of network functions virtualization (NFV) is analyzed. Moreover, the principle of virtualization is explained. Secondly, the analysis of network slicing is performed, from the point of view of transport systems implementation in the future 5G networks. The important part is the analysis of architecture proposals for the 5G communications system, implemented as ITS, for various scenarios of its work. The aim of this paper is the study on practice architecture of the 5G communication network for the ITS system, introduced as physical radio-informatics system implementation.

  • 9 - Solid oxide fuel and electrolysis cells
    • Christian Lenser
    • David Udomsilp
    • Norbert Menzler
    • Peter Holtappels
    • Takaya Fujisaki
    • Leonard Kwati
    • Hiroshige Matsumoto
    • A Sabato
    • F Smeacetto
    • Andreas Chrysanthou
    • Sebastian Molin
    2019

    In this chapter, the fundamental reactions, the geometrical designs, the material requirements, and the status of SOFCs and SOECs are presented. In the following seven chapters, the most important components of an SOC are described and the chapter ends with a summary and outlook. The described components are: (i) oxygen-ion conductors (electrolyte), (ii) anode materials for SOFCs (cathode in SOEC mode), (iii) cathode materials for SOFCs (anode in SOEC mode), (iv) proton conductors and adjacent electrodes, (v) stack sealing materials, (vi) ceramic coatings for metal interconnects, and (vii) degradation effects limiting lifetime and performance.

  • A bisection‐based heuristic for rapid EM‐driven multiobjective design of compact impedance transformers
    • Adrian Bekasiewicz
    • Sławomir Kozieł
    2019 INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS

    Design of microwave structures is a multiobjective task where several conflicting requirements have to be considered at the same time. For contemporary circuits characterized by complex geometries, multiobjective optimization cannot be performed using standard population‐based algorithms due to high cost of electromagnetic (EM) evaluations. In this work, we propose a deterministic approach for fast EM‐driven multiobjective design of microwave structures. Our Pareto ranking bisection algorithm (PRBA) generates candidate designs by dividing the line segments connecting previously obtained Pareto optimal solutions and refining them by means of poll‐type search involving Pareto ranking. Computational efficiency of the optimization process is ensured by a small number of objective function evaluations required by PRBA as well as by executing the algorithm using the low‐fidelity EM model of the structure at hand. The algorithm is demonstrated using a compact impedance transformer. Experimental validation is also provided.

  • A Compact Circularly Polarized Antenna With Directional Pattern for Wearable Off-Body Communications
    • Ubaid Ullah
    • Ismail Mabrouk
    • Sławomir Kozieł
    2019 Full text IEEE Antennas and Wireless Propagation Letters

    This letter presents a geometrically simple and compact circularly polarized (CP) antenna with unidirectional radiation characteristics for off-body communications. The proposed antenna is based on a microstrip line monopole extension from a coplanar waveguide (CPW) and a protruded stub from one side of the coplanar ground plane along the length of the monopole. The orthogonal components of equal amplitudes required for circular polarization are induced using the vertical stub and the horizontal edge of the coplanar ground plane. To control the radiation of the antenna towards the human body, a flexible, high permittivity laminated substrate is used as a reflector. The topological simplicity of the antenna permits a small number of adjustable variables and therefore a reduced computational cost of the parameter tuning process. The total footprint of the proposed antenna is only 0.23λ0×0.24λ0=0.05λ20 , at the lowest operating frequency. The antenna is numerically and experimentally characterized in the free-space and on a real human volunteer. The simulated and measured reflection coefficient indicates that the operating range of the antenna extends from 5.16 GHz to 6.13 GHz range with 100-percent bandwidth overlap between the impedance bandwidth and the axial ratio (AR) bandwidth. The peak gain of the antenna is 6.22 dBic with a stable radiation pattern in the +z-direction, high efficiency of 90%, and 0.131W/g SAR. The antenna can be used for Unlicensed National Information Infrastructure (U-NII) worldwide band and ISM 5.8 GHz ban

  • A COMPARISON OF WEAR PROPERTIES OF WATER LUBRICATED NBR AND PTFE SLIDING BEARINGS
    • Ewa Piątkowska
    2019 Full text TRIBOLOGIA

    The excessive wear of a journal shaft can be caused by many factors, for example, working conditions (e.g., temperaturę, slip speed, the type of lubricant), pressure, the type of material used on the bearings and shafts and their roughness, as well as contamination remaining in the system. This paper presents the roughness profiles co-operating with a rubber (NBR) and polytetrafluoroethylene (PTFE) bushes. The conditions of cooperation between the two materials tested in the sliding combination with the stainless steel journal were the same in each pair of bearings (PV); therefore, the comparison of their wear depends only on the material properties of the bush and the deformation of the journal shaft caused by the bending moment. To assess the size of the journal shaft, they were tested using a profilograph. In addition to the journal shaft, bearings were also evaluated, the wear level of which was noticed without the use of specialized equipment.

  • A comprehensive approach to double inverted pendulum modelling
    • Kamil Andrzejewski
    • Mateusz Czyżniewski
    • Maciej Zielonka
    • Rafał Łangowski
    • Tomasz Zubowicz
    2019 Full text Archives of Control Sciences

    The problem of mathematical modelling and indication of properties of a DIP has been investigated in this paper. The aim of this work is to aggregate the knowledge on a DIP modelling using the Euler-Lagrange formalism in the presence of external forces and friction. To indicate the main properties important for simulation, model parameters identification and control system synthesis, analytical and numerical tools have been used. The investigated properties include stability of equilibrium points, a chaos of dynamics and non-minimum phase behaviour around an upper position. The presented results refer to the model of a physical (constructed) DIP system.

  • A Computationally Efficient Model for Predicting Successful Memory Encoding Using Machine-Learning-based EEG Channel Selection
    • Krishnakant Saboo
    • Yogatheesan Varatharajah
    • Brent M. Berry
    • Michael R. Sperling
    • Richard Gorniak
    • Kathryn A. Davis
    • Barbara C. Jobst
    • Robert E. Gross
    • Bradley C. Lega
    • Sameer A. Sheth
    • Michael J. Kahana
    • Michał Tomasz Kucewicz
    • Gregory A. Worrell
    • Ravishankar K Iyer
    2019 IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE

    Computational cost is an important consideration for memory encoding prediction models that use data from dozens of implanted electrodes. We propose a method to reduce computational expense by selecting a subset of all the electrodes to build the prediction model. The electrodes were selected based on their likelihood of measuring brain activity useful for predicting memory encoding better than chance (in terms of AUC). A logistic regression prediction model was built using spectral features of intracranial electroencephalography (iEEG) from the selected electrodes. We demonstrate our method on iEEG data from 37 human subjects performing free recall verbal short-term memory tasks. The method achieves a 36.3% reduction in the number of electrodes used for prediction, resulting in a 64.9% reduction in inference computation time with just a 0.3% loss in prediction performance compared to the case when all electrodes were used. The electrodes selected using our method provided improved prediction performance compared to those electrodes that were not selected in 31 out of 37 patients. Building upon this observation, we also developed a method to identify the subjects for whom the proposed electrode selection method would be beneficial.

  • A CONCEPT DESIGN OF DIESEL – HYDRAULIC PROPULSION SYSTEM FOR PASSENGER SHIP INTENDED FOR INLAND SHALLOW WATER NAVIGATION
    • Czesław Dymarski
    2019 Full text Polish Maritime Research

    This paper presents an analysis of environmental and technical conditions necessary for working out a possibly most favourable propulsion system for a two – segment passenger ship intended for navigation between Berlin and Kaliningrad. There are presented various types of propulsion systems for small ships as well as analyzed their possible applications and consequences. In this work there were taken into account system’s reliability, efficiency, dimensions, mass and costs of manufacturing, assembling and possible replacing the system components as well as an impact on maneuverability and natural environment. With taking into account the above mentioned criteria it was finally found that the diesel-hydraulic system fitted with two azimuthal ducted solid propellers is the most favourable. There are also presented a schematic propulsion and control diagram, three-dimensional arrangement drawing of system components as well as assembly drawing of the designed azimuthal propulsion system.

  • A Concept of Automatic Film Color Grading Based on Music Recognition and Evoked Emotions
    • Dawid Weber
    • Bożena Kostek
    2019

    The article presents the aspects of the final selection of the color of shots in film production based on the psychology of color. First of all, the elements of color processing, contrast, saturation or white balance in the film shots were presented and the definition of color grading was given. In the second part of the article the analysis of film music was conducted in the context of stimulating appropriate emotions while watching the film. Objective parameters of the color of the shot have been defined as well as low and high-level parameters of the analysis of musical compositions, which will allow to study the mood in the soundtrack. Finally, a concept of color grading system working on machine learning based on emotion detection in the soundtrack was proposed.

  • A concept of software extension of 3D low-PRF radar systems to 4D semi-medium-PRF radar systems
    • Michał Meller
    • Kamil Stawiarski
    2019 Full text Proceedings of SPIE

    We present a concept of software modification of three-dimensional (3D) radar systems, designed to work in the low pulse repetition frequency mode, that equips them with the ability to estimate the radial velocity and to properly measure the range of targets that are detected outside the radar’s instrumented range. Despite the fact that the proposed modifications are designed so as to require only minor changes in software, they offer significant growth in the system capabilities. The modified system may potentially work in the medium pulse repetition frequency mode as a so-called four-dimensional (4D) system. The proposed Doppler velocity estimation algorithm is presented in details as well.

  • A correlation between electron-hole pair radii and magnetomodulation of exciplex fluorescence in electron donor-electron acceptor organic systems
    • Daniel Karol Pelczarski
    • Piotr Jerzy Grygiel
    • Karol Falkowski
    • Waldemar Stampor
    2019 Full text APPLIED PHYSICS LETTERS

    Electric field dependencies of electromodulated photoluminescence and magnitudes of the magnetic-field effect on photoluminescence havebeen measured in vacuum-evaporated films of m-MTDATA [4,4',4"-tris(N-(3-methylphenyl)-N-phenylamino)triphenylamine]:bathophe-nanthroline, m-MTDATA:BCP (bathocuproine), as well as 4,4',4"-tris[2-naphthyl(phenyl)amino]triphenylamine:BCP. The Sano-Tachiya-Noolandi-Hong extension of standard Onsager formalism was used to investigate the electron-hole pair dissociation process which allowedus to estimate the pair intercarrier distances and the final speed of carrier recombination. A distinct correlation between the pair radii andthe magnitude of the magnetic-field effect has been found.

  • A Cu/Zn heterometallic complex with solvent-binding cavity, catalytic activity for the oxidation of 1-phenylethanol and unusual magnetic properties
    • Agnieszka Mielcarek
    • Alina Bieńko
    • Paulina Saramak
    • Julia Jezierska
    • Anna Dołęga
    2019 DALTON TRANSACTIONS

    Mononuclear and polymeric complexes of zinc(II) and copper(II) have been synthesized using two isomers of the hemi-salen ligand with a different mutual orientation of donor atoms. The heterometallic Cu/Zn metallocycle features a catalytic niche filled with the molecule of water and molecules of methanol. This unusual compound exhibits both pronounced catalytic activity in the reaction of oxidation of a secondary alcohol to ketone and field induced slow magnetic relaxation, which is a very rare phenomenon among Cu(II) complexes.