Publications Repository - Gdańsk University of Technology

Page settings

polski
Publications Repository
Gdańsk University of Technology

Show publications from the year

Publications from the year 2020

Show all
  • Learning from Mistakes. A Study on Maturity and Adaptability to Change
    • Wioleta Kucharska
    • Denise A. D. Bedford
    2020 Full text

    Learning culture matters; company culture must support continuous improvement. Organizational learning is a process of identifying and modifying mistakes that result from interactions between co-workers. The article aims to explore the learning power via errors, using the level of organizational maturity as a moderator. Companies need to know how organizational maturity may moderate the adaptability to change via the acceptance of their mistakes. Based on 380 samples gathered from November to December 2019 among Polish employees working in knowledge-driven organizations across various industries, and analyzing the data using PROCESS software, the authors established that employees working in young organizations adapt to changes better than those who work in mature companies. On the other hand, the acceptance of mistakes by mature organizations significantly improves their adaptability to change. The study shows that mature organizations achieve better change adaptability than young organizations when accepting mistakes. The conclusion is that mature organizations may adapt to changes only if they accept errors (learn from their errors). Concerning young organizations' mistakes, their effect on adaptability to change is not significant.

  • Light Symposium. Connecting health research with lighting practice
    • Karolina Zielińska-Dąbkowska
    2020 Full text ARC Lighting In Architecture

    Thanks to state-of-the-art medical and environmental research, our current understanding about the impact of light and lighting is improving at a rapid rate. While the evolution of lighting technologies offers promising design possibilities, it also poses new challenges to planners and the general public. This is further complicated by the fact that today’s modern indoor lifestyle means we can be completely disconnected from nature and natural light. Instead, we live under artificial skies in man-made environments. To answer the need for cross-disciplinary talks and in order to bridge the knowledge gaps in the field of architectural lighting design, in 2007, the concept of a Light Symposium emerged at the Professional Lighting Designers Convention (PLDC) in London. Michael F. Rohde, a German lighting designer and professor at the Hochschule Wismar (HSW) in Wismar, was inspired to create an interdisciplinary event where light and health could be holistically addressed and connected with research and practice.

  • Light-improved glucose sensing on ordered Au-Ti heterostructure
    • Katarzyna Siuzdak
    • Dirk Döhler
    • Julien Bachmann
    • Jakub Karczewski
    • Katarzyna Grochowska
    2020 OPTIK

    Non-enzymatic electrochemical platforms sensitive towards glucose presence have attracted a worldwide attention during last decades. We report on influence of solar light onto response of gold-titanium heterostructures prepared via controllable approach. The material based on Au nanoparticles orderly distributed over the structured titanium foil was obtained by electrochemical anodization followed by chemical etching, magnetron sputtering of gold and finally thermal treatment in the continuous regime. It is proven that the applied synthesis route leads to the enhanced visible light absorption boosting material photoactivity. Fabricated electrode immersed in the glucose containing solution and exposed to the solar light exhibits superior increase of oxidation current comparing to pristine substrate before thermal annealing. Photosensor is characterized by broad linear response up to 40 mM of glucose, limit of detection of 0.2 and 0.1 mM and sensitivity of 3.08 and 0.92 μA/cm2 in NaOH and PBS, respectively. It is concluded that the electrode exhibits enhanced performance taking advantage from plasmon resonance effect and the presence of thin titania passive film. Moreover, obtained material is stable under prolonged illumination and was verified in the presence of blood serum sample. Overall, presented results suggest that the impact of solar light should be taken into account during works on sensing devices.

  • Light-Powered Starter for Micro-Power Boost DC–DC Converter for CMOS Image Sensors
    • Grzegorz Blakiewicz
    • Jacek Jakusz
    • Miron Kłosowski
    • Waldemar Jendernalik
    • Stanisław Szczepański
    2020 Full text CIRCUITS SYSTEMS AND SIGNAL PROCESSING

    The design of a starter for a low-voltage, micro-power boost DC–DC converter intended for powering CMOS image sensors is presented. A unique feature of the starter is extremely low current, below 1 nA, supplying its control circuit. Therefore, a high-voltage (1.3 V) configuration of series-connected photovoltaic diodes available in a standard CMOS process or a small external LED working in photovoltaic mode can be used as an auxiliary supply for the control circuit. With this auxiliary supply, the starter can generate a starting voltage from 1 to 2.7 V using 50–200 mV supply voltage. The starter was verified by simulations and measurements of a prototype chip fabricated in a standard 180-nm CMOS technology. The results of simulations and tests showed correct operation of the starter in the temperature from 0 to 50 °C and under process parameters variation.

  • Limited selectivity of amperometric gas sensors operating in multicomponent gas mixtures and methods of selectivity improvement
    • Marta Dmitrzak
    • Piotr Jasiński
    • Grzegorz Jasiński
    2020 Full text Bulletin of the Polish Academy of Sciences-Technical Sciences

    In recent years, smog and poor air quality have became a growing environmental problem. There is a need to continuously monitor the quality of the air. The lack of selectivity is one of the most important problems limiting the use of gas sensors for this purpose. In this study, the selectivity of six amperometric gas sensors is investigated. First, the sensors were calibrated in order to find a correlation between the concentration level and sensor output. Afterwards, the responses of each sensor to single or multicomponent gas mixtures with concentrations from 50 ppb to 1 ppm were measured. The sensors were studied under controlled conditions, a constant gas flow rate of 100 mL/min and 50 % relative humidity. Single Gas Sensor Response Interpretation, Multiple Linear Regression, and Artificial Neural Network algorithms were used to predict the concentrations of SO2 and NO2. The main goal was to study different interactions between sensors and gases in multicomponent gas mixtures and show that it is insufficient to calibrate sensors in only a single gas.

  • Limiting distribution of the three-state semi-Markov model of technical state transitions of ship power plant machines and its applicability in operational decision-making.
    • Jerzy Girtler
    2020 Full text Polish Maritime Research

    The article presents the three-state semi-Markov model of the process {W(t): t 0} of state transitions of a ship power plant machine, with the following interpretation of these states: s1 – state of full serviceability, s2 – state of partial serviceability, and s3 – state of unserviceability. These states are precisely defined for the ship main engine (ME). A hypothesis is proposed which explains the possibility of application of this model to examine models of real state transitions of ship power plant machines. Empirical data concerning ME were used for calculating limiting probabilities for the process {W(t): t 0}. The applicability of these probabilities in decision making with the assistance of the Bayesian statistical theory is demonstrated. The probabilities were calculated using a procedure included in the computational software MATHEMATICA, taking into consideration the fact that the random variables representing state transition times of the process {W(t): t 0} have gamma distributions. The usefulness of the Bayesian statistical theory in operational decision-making concerning ship power plants is shown using a decision dendrite which maps ME states and consequences of particular decisions, thus making it possible to choose between the following two decisions: d1 – first perform a relevant preventive service of the engine to restore its state and then perform the commissioned task within the time limit determined by the customer, and d2 – omit the preventive service and start performing the commissioned task.

  • L’indistricabile intreccio. Imprese, imprenditori e regime fascista. (An Inextricable Intertwining. Companies, Entrepreneurs, and the Fascist Regime)
    • Luciano Segreto
    2020 Studi Storici

    The papers of this section analyse the relationships between the economic and business community and the fascist regime. Their aim is to refresh the interpretations that were established in the 1960s-1970s and remained undisputed in the decades thereafter, becoming a sort of mantra among Italian contemporary historians. The article presents the most relevant contributions of that historiographical season, explaining the reasons for a new approach and a new interpretation on the strength of the numerous public, business, and private archives that have become available over the past 20-30 years, extensive use of which has been made by the papers included in this section

  • Linezolid-resistant Enterococcus faecium strains isolated from one hospital in Poland –commensals or hospital-adapted pathogens?
    • Beata Krawczyk
    • Magdalena Wysocka
    • Roman Kotłowski
    • Marek Bronk
    • Michał Michalik
    • Alfred Samet
    2020 Full text PLOS ONE

    One of the most pressing problems of enterococci infections is occurring resistance to linezolid, which is an antibiotic used in the treatment of infections caused by vancomycin-resistant strains (VRE). The main objective of our research was to investigate the relationship of 19 linezolid-resistant E. faecium isolates from 18 patients hospitalized at Clinical Hospital in Gdansk (Poland). One of the LZDREF was isolated in 2003 (K2003), and another 18 were collected from 2013 to 2017. Genotyping with PCR MP method indicated 14 main unrelated genetic profiles and no association with K2003 strain. Two isolates with the same genotype and genetically closely related two sub-types (2 isolates for each sub-type) were hospital-derived colonizations of patients. The other unrelated genotypes were discussed in the context of colonization, nosocomial infections, and commensal origin, taking into account prior exposure to linezolid. We determined the presence of a point mutation G2576T in six loci of 23S rDNA. There was also a significant correlation (p<0.0015) between the presence of MIC>32 value and the presence of G2576T point mutation on the sixth rrn. We also detected 5 virulence genes for all isolates: gelE, cylA, asa1, hyl, esp. Correlation (p≤0.0001) was observed between the presence of gelE gene encoding gelatinase and two other genes: cylA and asa1 encoding cytolysin and collagen binding protein responsible for aggregation of bacterial cells, respectively. Significant correlation was also observed between asa1 and cfr genes encoding 23S rRNA rybonuclease responsible for resistance to PhLOPSA antibiotics (p = 0.0004). The multidimensional analysis has also shown the correlation between cfr gene and GI-tract (p = 0, 0491), which suggests horizontal gene transfer inside the gut microbiota and the risk of colonization with linezolid-resistant strains without previously being treated with the antibiotic. The patient could have been colonized with LZDRVREF strains which in the absence of competitive microbiota quickly settle in ecological niches favourable for them and pose a risk for the patient. 

  • Lipidomika – strategie analityczne i zastosowania
    • Weronika Hewelt-Belka
    • Agata Kot-Wasik
    2020

    Bioanalityka, to interdyscyplinarna dziedzina wiedzy, która stanowi szybko rozwijający się obecnie dział chemii analitycznej. Bioanaliza zaczyna odgrywać kluczową rolę w szybko rozwijających się dziedzinach współczesnej bionauki w ramach genomiki, proteomiki, metabolomiki, lipidomiki i innych. Umiejętność doboru odpowiednich metod i narzędzi, w zależności od rodzaju podejmowanego problemu, jest niezwykle ważne i często decyduje o powodzeniu zarówno kolejnych etapów jak i całości badań. Duże zainteresowanie bioanalityką, w tym kształcenie na poziomie przedmiotów podstawowych i specjalnościowych, jak również funkcjonowanie specjalności „Bioanalityka” na wielu uczelniach, potrzeby laboratoriów klinicznych czy medycyny sądowej, czy kontroli jakości produktów spożywczych i żywności, skłoniły redaktorów naukowych do przygotowania niniejszej książki. Przedstawione w niej zagadnienia będą przydatne studentom i pracownikom naukowym, pracownikom laboratoriów badawczych również z pokrewnych dziedzin. Książka ta jest opracowaniem zbiorowym, w którym znakomici specjaliści z różnych ośrodków naukowych i badawczych w Polsce przedstawili – potencjał, aplikacje kliniczne i środowiskowe oraz perspektywy dalszego rozwoju bioanalityki.

  • Lipidy szkodliwe dla zdrowia
    • Izabela Sinkiewicz
    2020

    Lipidy są niezbędne w diecie człowieka.Są one źródłem energii, niezbędnych, nienasyconych kwasów tłuszczowych i cholesterolu. Jednakże przekroczenie ich spożycia w stosunku do zapotrzebowania, stanowi zagrożenie dla zdrowia.Znajomość i przestrzegania prawidłowych racji lipidów i ich rodzaju w żywieniu powinno zapewnić konsumentom profilaktykę metabolicznych chorób układu krążenia oraz zapobiec nowotworom i otyłości

  • Liquefaction of alder wood as the source of renewable and sustainable polyols for preparation of polyurethane resins
    • Kamila Gosz
    • Daria Kowalkowska-Zedler
    • Józef Haponiuk
    • Łukasz Piszczyk
    2020 WOOD SCIENCE AND TECHNOLOGY

    Liquefaction of wood-based biomass gives different polyol properties depending on the reagents used. In this article, alder wood sawdust was liquefied with glycerol and poly(ethylene glycol) solvents. Liquefaction reactions were carried out at temperatures of 120, 150 and 170 °C. The obtained bio-polyols were analyzed in order to establish the process efficiency, hydroxyl number, acid value, viscosity and structural characteristics using Fourier transform infrared (FTIR), carbon (13C) and proton (1H) NMR analyses. The results indicate that the optimal conditions for the liquefaction process are at 150 °C for 6 h. The results of the FTIR spectra analysis and the hydroxyl number in the range of 214–687 mg KOH/g showed that the obtained bio-polyols are a potential substitute for petrochemical polyols commonly used for the synthesis of polyurethane polymers. Polyurethane resins containing 90 wt% of bio-polyol were obtained by a one-step method using a hydraulic press. The material was pressed for 15 min (5 MPa) at 100 °C with an NCO/OH ratio in the range of 0.9–1.2. Dynamic mechanical thermal analysis (DMA) showed high cross-linking density and modulus of elasticity in a wide range of 62–1362 MPa.

  • Literature review of user needs, toward user requirements
    • Claudia Naves David Amorim
    • David Geisler-Moroder,
    • Thorbjörn Laike
    • Justyna Martyniuk-Pęczek
    • Barbara Szybińska-Matusiak
    • Wilfried Pohl
    • Natalia Sokół
    2020

    This report has been developed in the frame of the IEA SHC Task 61 Subtask A “User requirements”. The main objective was to rethink and reformulate user requirements to lighting (daylighting and electric lighting) in public buildings on the basis of a thorough literature study. The work is a joint effort of a number of scientists and represents collective knowledge in this topic. The concept of Lighting quality is the one, among many lighting concepts, which expresses the user perspective best. Lighting quality is the important goal of lighting designers and planners; however, it is difficult to define and to measure. The following definition of lighting quality has been used for many years: Lighting quality is a concept that allows excellent vision while providing high comfort. (Kruisselbrink, Dangol and Rosemann) (2018) In this recent paper, the authors try to find measures that could be directly used for describing the lighting quality: quantity, glare, spectral power distribution, distribution of light, directionality and dynamics. The overview also shows that the luminance distribution is a suitable way for at least getting useful information of the lighting quality. If spectral distribution is added to these measurements an even better description of the lighting quality is obtained. The above-mentioned definition of lighting quality focuses at humans, but it does not take into consideration aspects of light that have indirect and profound impact on human health and well-being. Those are the non-image forming aspects of light and some psychological aspects. In this report those additional aspects are included and structured in chapters as follows: 1. Perception of light 2. Visual Comfort 3. Psychological aspects of lighting (view out, perceived quality of space, privacy, etc.) 4. Non-image forming aspects of light (ipRGCs action spectrum, hormones, etc.) By using these four different basic aspects we have the possibility to define several criteria for lighting quality, both image-forming and non-image forming. We have also the possibility to compare between qualities of electric lighting and daylighting. During the last twenty years the knowledge about light and lighting has developed and at the same time the technological development has been immense. Today we are able to get much more electrical lighting with less energy than ever before, but is the light of good quality? We need to develop evaluation methods.

  • LNG TANK IN ŚWINOUJŚCIE: NONLINEAR ANALYSIS OF THE TANK DOME ELEMENTS BEHAVIOUR
    • Bartosz Sobczyk
    2020 Full text Polish Maritime Research

    In this paper, the dome of a tank in the Świnoujście LNG terminal is analysed. Some of the rafter ribs at the connection with hangers were not mounted during construction of the tank dome. Therefore, it has become necessary to estimate its response, which has been done with the aid of some computational models of the dome, that have been created in the finite element method environment. Different local models are studied, aiming to recreate possible outermost conditions of the tank dome response, i.e. with or without composite action between steel and concrete parts of the tank dome. Static calculations with material and geometric nonlinearities are carried out on the computational models, enabling the creation of a load capacity envelope of the rafter with or without ribs. The obtained results are then used to decide if repair works need to be done and whether the missing ribs should be welded.

  • Local and global response of sandwich beams made of GFRP facings and PET foam core in three point bending test
    • Łukasz Pyrzowski
    • Bartosz Sobczyk
    2020 Full text COMPOSITE STRUCTURES

    In the paper behaviour of laminated sandwich beams (FRP face sheet – PET foam core – FRP face sheet) subjected to three point bending is studied. The paper aim is to find practical descriptions enabling effective and accurate estimation of the elastic response, damage and failure of the beams, basing on experiments and static calculations. Therefore a number of tests are described, that were done on laminated coupons and foam specimens in order to choose appropriate material models and find their constants. Experimental results of three-point bending tests of sandwich beams with three types of PET cores are analysed to evaluate the chosen material laws. The beam responses are predicted in numerical static simulations. The equations of problem are solved by means of finite element method (FEM). In the end the experimental and FEM results are compared. They are similar in terms of both their quantity and quality.

  • Local buckling of composite channel columns
    • Czesław Szymczak
    • Marcin Kujawa
    2020 Full text CONTINUUM MECHANICS AND THERMODYNAMICS

    The investigation concerns local buckling of compressed flanges of axially compressed composite channel columns. Cooperation of the member flange and web is taken into account here. The buckling mode of the member flange is defined by rotation angle a flange about the line of its connection with the web. The channel column under investigation is made of unidirectional fibre-reinforced laminate. Two approaches to member orthotropic material modelling are performed: the homogenization with the aid of theory of mixture and periodicity cell or homogenization upon the Voigt–Reuss hypothesis. The fundamental differential equation of local buckling is derived with the aid of the stationary total potential energy principle. The critical buckling stress corresponding to a number of buckling half-waves is assumed to be a minimum eigenvalue of the equation. Some numerical examples dealing with columns are given here. The analytical results are compared with the finite element stability analysis carried out by means of ABAQUS software. The paper is focused on a close analytical solution of the critical buckling stress and the associated buckling mode while the web–flange cooperation is assumed.

  • Lokalizacja terminala ruchomego w korytarzu przy użyciu kabli promieniujących
    • Olga Błaszkiewicz
    • Jarosław Sadowski
    • Jacek Stefański
    2020 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

    W referacie przedstawiono wyniki testów możliwości określania położenia terminala ruchomego wzdłuż korytarza na podstawie propagacji sygnałów w kablach promieniujących w dwóch kierunkach. Opisane zostało stanowisko pomiarowe oraz wyniki uzyskane przy różnych sposobach wytwarzania sygnałów pomiarowych w instalacji jedno- i dwuprzewodowej.

  • Long Distance Geographically Distributed InfiniBand Based Computing
    • Karol Niedzielewski
    • Marcin Semeniuk
    • Jarosław Skomiał
    • Jerzy Proficz
    • Piotr Sumionka
    • Bartosz Pliszka
    • Marek Michalewicz
    2020 Full text Supercomputing Frontiers and Innovations

    Collaboration between multiple computing centres, referred as federated computing is becom- ing important pillar of High Performance Computing (HPC) and will be one of its key components in the future. To test technical possibilities of future collaboration using 100 Gb optic fiber link (Connection was 900 km in length with 9 ms RTT time) we prepared two scenarios of operation. In the first one, Interdisciplinary Centre for Mathematical and Computational Modelling (ICM) in Warsaw and Centre of Informatics – Tricity Academic Supercomputer & networK (CI- TASK) in Gdan ́sk prepared a long distance geographically distributed computing cluster. System consisted of 14 nodes (10 nodes at ICM facility and 4 at TASK facility) connected using Infini- Band. Our tests demonstrate that it is possible to perform computationally intensive data analysis on systems of this class without substantial drop in performance for a certain type of workloads. Additionally, we show that it is feasible to use High Performance Parallex [1], high level abstrac- tion libraries for distributed computing, to develop software for such geographically distributed computing resources and maintain desired efficiency. In the second scenario, we prepared distributed simulation - postprocessing - visualization workflow using ADIOS2 [2] and two programming languages (C++ and python). In this test we prove capabilities of performing different parts of analysis in seperate sites.

  • Long-Period Gratings and Microcavity In-Line Mach Zehnder Interferometers as Highly Sensitive Optical Fiber Platforms for Bacteria Sensing
    • Tinko Eftimov
    • Monika Janik
    • Marcin Koba
    • Mateusz Śmietana
    • Predrag Mikulic
    • Wojtek J. Bock
    2020 Full text SENSORS

    Selected optical fiber sensors offer extraordinary sensitivity to changes in external refractive (RI), which make them promising for label-free biosensing. In this work the most sensitive ones, namely long-period gratings working at (DTP-LPG) and micro-cavity in-line Mach-Zehnder interferometers (µIMZI) are discussed for application in bacteria sensing. We describe their working principles and RI sensitivity when operating in water environments, which is as high as 20,000 nm/RIU (Refractive index unit) for DTP-LPGs and 27,000 nm/RIU for µIMZIs. Special attention is paid to the methods to enhance the sensitivity by etching and nano-coatings. While the DTP-LPGs offer a greater interaction length and sensitivity to changes taking place at their surface, the µIMZIs are best suited for investigations of sub-nanoliter and picoliter volumes. The capabilities of both the platforms for bacteria sensing are presented and compared for strains of Escherichia coli, lipopolysaccharide E. coli, outer membrane proteins of E. coli, and Staphylococcus aureus. While DTP-LPGs have been more explored for bacteria detection in 102–106 Colony Forming Unit (CFU)/mL for S. aureus and 103–109 CFU/mL for E. coli, the µIMZIs reached 102–108 CFU/mL for E. coli and have a potential for becoming picoliter bacteria sensors.

  • LONG-TERM RISK CLASS MIGRATIONS OF NON-BANKRUPT AND BANKRUPT ENTERPRISES
    • Tomasz Korol
    2020 Full text Journal of Business Economics and Management

    This paper investigates how the process of going bankrupt can be recognized much earlier by enterprises than by traditional forecasting models. The presented studies focus on the assessment of credit risk classes and on determination of the differences in risk class migrations between non-bankrupt enterprises and future insolvent firms. For this purpose, the author has developed a model of a Kohonen artificial neural network to determine six different classes of risk. Long-term analysis horizon of 15 years before the enterprises went bankrupt was conducted. This long forecasting horizon allows one to identify, visualize and compare the intensity and pattern of changes in risk classes during the 15-year trajectory of development between two separate groups of companies (150 bankrupt and 150 non-bankrupt firms). The effectiveness of the forecast of the developed model was compared to three popular statistical models that predict the financial failure of companies. These studies represent one of the first attempts in the literature to identify the long-term behavioral pattern differences between future “good” and “bad” enterprises from the perspective of risk class migrations.

  • Looking for the Optimal Location of an Eco-District within a Metropolitan Area: The Case of Tricity Metropolitan Area
    • Julia Kurek
    • Justyna Martyniuk-Pęczek
    2020 Full text Sustainability

    Compact housing structures located in city centers are considered to be the most energy and environmentally eective, mainly due to the access to services, transport networks and municipal infrastructures. There is the question of why so many of the acknowledged ecological housing complexes are located on the outskirts of cities or suburbs. Numerous cities decide to introduce strategies either to densify city centers, hoping to improve energy eciency. The Tricity metropolitan area is a special case undergoing dynamic transformation, and its development overlaps with the processes of both planned densification of the center as well as uncontrolled suburbanization. The goal of this study was to find the correlation between optimal location of an eco-district from the functional center of the Tricity metropolitan area, allowing for the most favorable energy and environmental parameters related both to the architectural and urban scale. The research was conducted in four dierent scenarios, concerning present and future development. In these scenarios, specific locations were examined, and the following were compared: total energy consumption, ecological footprint and CO2 lifecycle emissions. This study shows the possibility for suburban housing complexes with appropriate parameters in an edge city model to have the same or better results than complexes situated closer to the functional center of the city. This is mainly due to the building’s energy eciency, sustainable mobility, municipal infrastructure and relevant service access. The research proves the importance of implementing sustainable energy-saving and environmentally oriented activities at both an architectural and urban scale planning process.