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Gdańsk University of Technology

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Publications from the year 2017

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  • Herbaria i florilegia od XV do XVIII wieku ze zbiorów PAN Biblioteki Gdańskiej
    • Urszula Szybowska
    • Magdalena Madeja-Grzyb
    2017

    Publikacja przedstawia wstępną analizę ilości i zawartości zespołu botanicznych druków tekstowych i graficznych, znajdujących się w historycznych zbiorach PAN Biblioteki Gdańskiej. W tekście uwzględniono także informacje o rozproszonej spuściźnie gdańskiej rodziny Breyne, znajdującej się obecnie w Forschungsbibliothek Gotha (Niemcy) oraz w Brenthurst Library w Johannesburgu (RPA), w tym o kolekcji 189 ilustracji botanicznych sióstr Breyne: Constantii Philippiny, Anny Renaty i Johanny Henrietty. Herbaria i florilegia ze zbiorów Biblioteki Gdańskiej stanowią kolekcję około 196 rozpraw naukowych, zielników i katalogów kwiatów oraz co najmniej 47 ilustracji botanicznych powstałych w okresie od XV do XVIII wieku.Europejska ilustracja botaniczna, która przeżywała swój dynamiczny rozwój w okresie XVI-XVIII wieku, pełniła funkcję użytkową, informacyjną, edukacyjną i estetyczną. Stanowiła uzupełnienie wiedzy botanicznej, lekarskiej i gastronomicznej, była wykorzystywana w katalogach kwiatowych reklamujących egzotyczne okazy, stawała się także przedmiotem podziwu jako forma demonstracji piękna przyrody.

  • Heterogeneous distribution of surface electrochemical activity in polycrystalline highly boron-doped diamond electrodes under deep anodic polarization
    • Jacek Ryl
    • Artur Zieliński
    • Robert Bogdanowicz
    • Kazimierz Darowicki
    2017 Full text ELECTROCHEMISTRY COMMUNICATIONS

    The surface homogeneity of boron-doped diamond electrodes is variable and depends on anodic polarization conditions. The differentiation factor is the gradual and localized change in surface termination. A series of measurements under different polarization conditions was performed in order to investigate the scale of this effect. Nanoscale impedance microscopy (NIM) revealed large variation of surface resistance in individual grains. Based on the obtained results, we claim that the level of electrochemical heterogeneity significantly depends on the crystallographic texture of BDD. Modification of boron-doped diamond surface termination under anodic oxidation is assumed to be a multistage process.

  • Heuristic Method of Safe Manoeuvre Selection Based on Collision Threat Parameters Areas
    • Rafał Szłapczyński
    • Joanna Szłapczyńska
    2017 Full text TransNav - The International Journal on Marine Navigation and Safety of Sea Transportation

    This paper is a continuation of papers dedicated to a radar-based CTPA (Collision Threat Parameters Area) display designed to support safe manoeuvre selection. The display visualizes all the ships in an encounter and presents situational overview from the own ship’s point of view. It calculates and displays information on unsafe or unrealistic own ship’s course & speed allowing a user to select a safe manoeuvre. So far only the manual selection was possible, thus the paper aims at presenting a heuristic approach towards the manoeuvre selection when using the display.

  • High frequency dynamics of an isotropic Timoshenko periodic beam by the use of the Time-domain Spectral Finite Element Method
    • Arkadiusz Żak
    • Marek Krawczuk
    • Magdalena Palacz
    • Łukasz Doliński
    • Wiktor Waszkowiak
    2017 Full text JOURNAL OF SOUND AND VIBRATION

    In this work results of numerical simulations and experimental measurements related to the high frequency dynamics of an aluminium Timoshenko periodic beam are presented. It was assumed by the authors that the source of beam structural periodicity comes from periodical alterations to its geometry due to the presence of appropriately arranged drill-holes. As a consequence of these alterations dynamic characteristics of the beam are changed revealing a set of frequency band gaps. The presence of the frequency band gaps can help in the design process of effective sound filters or sound barriers that can selectively attenuate propagating wave signals of certain frequency contents. In order to achieve this a combination of three numerical techniques were employed by the authors. They comprise the application of the Time-domain Spectral Finite Element Method in the case of analysis of finite and semi-infinite computational domains, damage modelling in the case of analysis of drill-hole influence, as well as the Bloch reduction in the case of analysis of periodic computational domains. As an experimental technique the Scanning Laser Doppler Vibrometry was chosen. A combined application of all these numerical and experimental techniques appears as new for this purpose and not reported in the literature available.

  • High Growth Aspirations of Nascent Entrepreneurs: Why Do They Fall?
    • Krzysztof Zięba
    2017 Full text Studia i Materiały Wydział Zarządzania Uniwersytet Warszawski

    Intention-based research become more and more popular in various domains, including entrepreneurship. Achieving growth by a business must be planned or at least consciously accepted by the business owner. That is why it is vital to take growth intentions into account when trying to predict growth of business. Personal attitude of an entrepreneur towards growth is important from the very beginning of business operations or even before that. Nascent entrepreneurs also have their growth aspirations during business founding process and those aspirations affect both this process and the subsequent growth of a new business. The aim of this paper is to investigate growth aspirations of nascent entrepreneurs with comparison to the attitudes of actual entrepreneurs towards the growth of their businesses. Additionally, this paper offers indirect answers to the question on what kind of mechanism - Lamarckian adaptation or Darwinian negative selection - may be responsible for gradual lowering of growth aspirations expressed by nascent entrepreneurs.

  • HIGH LEVEL SYNTHESIS IN FPGA OF TCS/RNS CONVERTER
    • Robert Smyk
    • Maciej Czyżak
    2017 Full text Poznan University of Technology Academic Journals. Electrical Engineering

    The work presents the design process of the TCS/RNS (two's complement–to– residue) converter in Xilinx FPGA with the use of HLS approach. This new approach allows for the design of dedicated FPGA circuits using high level languages such as C++ language. Such approach replaces, to some extent, much more tedious design with VHDL or Verilog and facilitates the design process. The algorithm realized by the given hardware circuit is represented as the program in C++. The performed design experiments had to show whether the obtained structures of TCS/RNS converter are acceptable with respect to speed and hardware complexity. The other aim of the work was to examine whether it is enough to write the program in C++ with the use of basic arithmetic operators or bit–level description is necessary. Finally, we present the discussion of results of the TCS/RNS converter design in Xilinx Vivado HLS environment.

  • High meniscal slope angle as a risk factor for meniscal allograft extrusion
    • Piotr Łuczkiewicz
    • Karol Daszkiewicz
    • Jacek Chróścielewski
    • Wojciech Witkowski
    • Leszek Kuik
    2017 MEDICAL HYPOTHESES

    A meniscal graft extrusion is still an unresolved problem that affects most patients after a meniscal transplantation. Despite the advances in surgical techniques, together with the improved methods for a meniscal allograft sizing, success is only observed in up to 75% of patients after they experience a meniscal allograft transplantation. Because a meniscal extrusion is associated with a cartilage deterioration and the progression of osteoarthritis there is a great interest in how to prevent this phenomenon. The crucial factor for the minimisation of a meniscal allograft extrusion is by perfectly matching the implant. Most methods for a meniscal allograft sizing only focus on assessing the length and the width of the meniscus. Even though there is some evidence that there is a relationship between the shape of the meniscus in a cross-sectional plane and the meniscal extrusion, any of the planning methods do not take this factor into consideration. Although there is a large variability of meniscus shapes in cross-section, we hypothesise that by taking the meniscal slope into account during surgical planning, as well as performing the correct adjustments of this particular parameter, we can diminish the risk of a meniscal allograft extrusion.

  • High performance LaNi1-xCoxO3-δ (x = 0.4 to 0.7) infiltrated oxygen electrodes for reversible solid oxide cells
    • Aleksander Chrzan
    • Simona Ovtar
    • Piotr Jasiński
    • Ming Chen
    • Anne Hauch
    2017 JOURNAL OF POWER SOURCES

    Oxygen electrodes prepared by infiltration of yttria stabilized zirconia backbone with Ce0.8Gd0.2O1.95 barrier layer and LaNi1-xCoxO3-δ (x=0.4 to 0.7) catalyst for application in reversible solid oxide cells have been studied. The effect of temperature and Ni:Co ratio on their phase composition, microstructure and electrochemical properties are discussed. It was shown that oxygen electrodes infiltrated with LaNi0.5Co0.5O3-δ had the lowest polarization resistance, i.e. 67 mΩ∙cm2 at 600 °C. The performance of a fuel electrode supported solid oxide cell with infiltrated oxygen electrode in both fuel cell and electrolysis mode was tested. Electrochemical characterization of the solid oxide cell showed that the resistance contribution from these oxygen electrodes to the overall cell resistance is minor i.e. approximately 20 mΩ∙cm2 at a temperature of 700 °C. The cell was also tested in the steam electrolysis mode at a constant current of -1.0 A∙cm-2 at 800 °C for 240 h. The oxygen electrode showed reasonable degradation rate with the oxygen electrode resistance of 33 mΩ∙cm2 at 700 °C after 240 h of testing.

  • High precision and accuracy using low cost GNSS receivers and supporting technologies
    • Krzysztof Bruniecki
    2017

    This chapter focuses on methods and techniques of positioning, based on the highly accurate and precise Global Navigation Satellite System (GNSS), which are available at a relatively low price. In this context, a comparison of different positioning methods provided by the free and open source software (FOSS) package called RTKLIB is given. Other aspects related to price reduction are also considered, including availability and selection of hardware (receiver, antenna, etc.) and market growth. The theoretical comparison of positioning methods is illustrated with their in-situ evaluation using a low-cost GNSS receiver. The evaluated receiver (i.e., u blox LEA-6T) provides different types of information including raw carrier phase measurements, therefore it allows us to obtain a very high precision of positioning by means of relative positioning algorithms. As the source of reference data for relative positioning, the services from the ASG-EUPOS system were used. ASG-EUPOS is a Polish GNSS augmentation system consisting of a network of GNSS base stations. It provides real-time corrections as well as post processing services for the entire territory of Poland.

  • High resolution X-ray diffractometry and reflectometry of semiconductor nano- and micro- structures based on X-ray refractive optics
    • Petr Ershov
    2017 Full text

    In this thesis proposed, discussed and studied novel synchrotron X-ray diffractometry and reflectometry methods based on a refractive optics. The experimental results obtained from the ID06 beamline at ESRF, Grenoble, France are presented and analyzed in this work to demonstrate a high angular and space resolution in addition to the opportunity to manage in situ and on operando experiments with the help of proposed X-ray optical techniques. As a novel high resolution X-ray diffraction (HRXRD) method is proposed Fourier transform by beryllium compound refractive lenses. The Si-Ge nano-heteroepitaxial structure representing a 100 nm Ge nanocrystals on free-standing 90 nm wide and 150 nm height Si pillars with a periodicity of 360 nm was studied by this new approach. Has been demonstrated the ability to resolve micro-radian diffraction with highest resolution as possible for today. Besides the proposed and tested the concept of using compound refractive lenses(CRL) for creating reflecto-interferogramm which gives opportunity in a thin films and membranes express analyses. By new approach have been resolved thickness oscillation from Si3N4 membranes with thickness 200, 500 and 1000 nm. Also was studied degradation process of 100 nm PMMA film under X-ray exposure.

  • High Rise Building: The Mega Sculpture Made Of Steel, Concrete and Glass
    • Alicja Stefańska
    • Daniel Załuski
    2017 Full text IOP Conference Series: Materials Science and Engineering

    High rise building has transformed from providing not only the expansion of floor space but functioning as mega sculpture in the city. The shift away from economic efficiency driven need is only expected to grow in the future. Based on literature studies; after analysing planning documents and case studies, it was examined whether the presumption that gaining the maximum amount of usable area is the only driving factor; or if the need for the creation of an image for the city provided a supplementary reason. The results showed that forming high rise buildings as three-dimensional sculptures is influenced not only by aesthetics, but also marketing. Visual distinction in the city skyline is economically beneficial for investors gaining not only functionality but art, enriching the cultural landscape. Organizing architectural competitions, public debates and following the latest art trends is therefore possible due to large budgets of such projects.

  • High Temperature Drying Process of Beech Wood (Fagus sylvatica L.) with Different Zones of Sapwood and Red False Heartwood
    • Jacek Barański
    • Aleksandra Konopka
    • Ivan Klement
    • Tatiana Vilkovská
    2017 Full text BIORESOURCES

    This study examined the changes in the properties of beech wood (Fagus sylvatica L.) after intense drying. Beech wood with false red heartwood was selected as the test specimen. The test samples had dimensions of 50 mm thickness, 180 mm width, and 350 mm length. The specimens were divided into two groups, false red heartwood and sapwood. These specimens were selected with different angles of the growth rings (radial and tangential). The results showed that samples with red heartwood, in comparison to samples with sapwood content, had a remarkable effect in covering. Observation of specimens with false red heartwood and sapwood before and after drying process revealed significant differences in color changes and measured values during the covering-slicing test, but not between samples with different growth ring angles.

  • HIGH TEMPERATURE HEAT PUMPS – PERSPECTIVE HEATING SYSTEMS?
    • Dariusz Mikielewicz
    • Jan Wajs
    2017

    In the paper presented are authors own concepts of high temperature compressor heat pumps for the utilisation of medium and low temperature sources of heat. Working fluids for use in high temperature heat pumps are discussed, as well as the criteria for their selection. Analyses are presented for the production of in the upper steam source at 130 °C. One-stage systems and cascade systems were analyzed. An analysis of the coefficient of performance (COP) and the most important characteristic values of the cycle for the selected working fluids was performed. The substance that achieved the highest COP was ethanol. Calculations have shown that this operating medium is most effective at a very wide temperature range from 80 to 150 °C, making it a promising prospect for use in high temperature heat pumps. For ethanol, the most thermodynamically advantageous is the basic one-stage system, without subcooling. In the case of a suitably high degree of subcooling, cascade systems such as R365mfc/R1234ze (Z) and pentane / R1234ze (Z) have also been considered.

  • Higher Absorption of Vitamin C from Food than from Supplements by Breastfeeding Mothers at Early Stages of Lactation
    • Dorota Martysiak-Żurowska
    • Maciej Zagierski
    • Ewa Woś-Wasilewska
    • Agnieszka Szlagatys-Sidorkiewicz
    2017 Full text INTERNATIONAL JOURNAL FOR VITAMIN AND NUTRITION RESEARCH

    The aim of the present study was to determine the effect of vitamin C supply in the diet of lactating women on vitamin C concentra¬tions in human milk (n = 97) sampled at different stages of lactation. Vitamin C levels were measured by liquid chromatography. Dietary intake of vitamin C was determined based on 3-day food dairies kept by breastfeeding mothers. Maternal dietary intakes of vitamin C from natural sources on lactation day 90 (n = 18) were significantly higher than on lactation days 15 (n = 42) and 30 (n = 37). The number of women taking vi¬tamin C supplements decreased in successive stages of lactation. The average daily intake of vitamin C was estimated at 119 mg, but nearly 20% of mothers consumed less than 50 mg of vitamin C per day. No significant correlations were observed between lactation stage and vitamin C levels in breast milk (r = 0.110, p = 0.064). The average vitamin C concentrations in human breast milk were determined at 50.9 mg / L, and were not higher than 80.6 mg / L regardless of lactation stage and maternal intake of vitamin C. Vitamin C excretion into breast milk is regulated to prevent exceeding saturation level. The vitamin C concentration in milk was positive correlated with maternal intake of vitamin C from food, in the case of non-supplemented diet (r = 0.402, p = 0.041). Our results suggest that vitamin C occurring in food is much better absorbed and passes into breast milk than vitamin C from supplements.

  • Highly Visible-Light-Photoactive Heterojunction Based on TiO2 Nanotubes Decorated by Pt Nanoparticles and Bi2S3 Quantum Dots
    • Paweł Mazierski
    • Joanna Nadolna
    • Grzegorz Nowaczyk
    • Wojciech Lisowski
    • Michał Jerzy Winiarski
    • Tomasz Klimczuk
    • Marek Kobylański
    • Stefan Jurga
    • Adriana Zaleska-Medynska
    2017 Journal of Physical Chemistry C

    A heterojunction with excellent visible light response and stability based on titanium dioxide nanotubes (TiO2 NTs), bismuth sulfide quantum dots (Bi2S3 QDs), and platinum nanoparticles (Pt NPs) is proposed. Both Pt NPs (3.0 ± 0.2 nm) and Bi2S3 QDs (3.50 ± 0.20 nm) are well distributed on the (i) top parts, (ii) inner walls, and (iii) outer walls of the TiO2 NTs. Visible-light-induced photoreaction was initialized by excitation of narrow band gap Bi2S3 QDs, followed by electron injection to the conduction band of TiO2, while Pt NPs acted as electron traps, enhacing O2–• generation. Phenol in the aqueous phase and toluene in the gas phase were efficiently degraded over Bi2S3–Pt NTs, even for wavelengths longer than 455 and 465 nm, respectively, while no degradation of model compounds was observed over pristine TiO2 NTs under the same irradiation conditions. Photocatalytic tests of phenol degradation in the presence of scavengers revealed that superoxide radicals were responsible for the visible-light degradation of organic compounds in the aqueous phase.

  • High-performance method of carbon nanotubes modification by microwave plasma for thin composite films preparation
    • Anna Danuta Dettlaff
    • Mirosław Sawczak
    • Ewa Klugmann-Radziemska
    • Dariusz Czylkowski
    • Robert Miotk
    • Monika Wilamowska-Zawłocka
    2017 Full text RSC Advances

    In this work we present a simple and efficient method of nitrogen plasma modification of carbon nanotubes (CNTs). The process allows for treatment of the nanotubes in the form of powder with quite a high yield (65 mg of CNTs per hour). The modified carbon nanotubes contain approx. 3.8% of nitrogen, mostly in the pyridinic form. Plasma treated CNTs exhibit better dispersibility in water and higher electric capacitance than pristine CNTs. Modified CNTs are a proper component of novel nanocomposites based on the conducting polymer poly(3,4-ethyleneidoxythiophene. Electrodeposited thin layers of the nanocomposite exhibit improved electrochemical properties (higher capacitance, better stability, lower resistance, faster diffusion) compared to the pure polymer layers.

  • Historia budowy i reaktywacji Kolei Kokoszkowskiej w postaci Pomorskiej Kolei Metropolitalnej
    • Daniel Załuski
    • Sylwia Rzepnicka
    2017 Full text

    W artykule została przedstawiona historia budowy Kolei Kokoszkowskiej (otwarcie w 1914 r. i zburzenie w 1945 r.), jej znaczenie dla powiązań przestrzennych Wolnego Miasta Gdańsk i polskich Kaszub, próba jej reaktywacji w związku z rozwojem aglomeracji trójmiejskiej w II połowie XX wieku i ostatecznie budowa po jej śladzie Pomorskiej Kolei Metropolitalnej na początku XXI wieku. W artykule poruszono zagadnienia związane ze sporami politycznymi samorządowców lokalnych i wojewódzkich, dyskusjami środowisk transportowych i konserwatorskich oraz lokalnej społeczności. Opisano pozytywne i negatywne skutki przestrzenne, organizacyjne i społeczne, wynikłe z przyjętych kompromisów dla zrealizowanej linii. Przedstawiono również planowane zamierzenia inwestycyjne w ramach rozbudowy Pomorskiej Kolei Metropolitalnej (PKM).

  • Historyczna ciekawostka
    • Zbigniew Cywiński
    2017 Świat Szkła

    Historyczna ciekawostka

  • Homotopy invariance of the Conley index and local Morse homology in Hilbert spaces
    • Marek Izydorek
    • Thomas O. Rot
    • Maciej Starostka
    • Marcin Styborski
    • Robert C.A.M. Vandervorst
    2017 Full text JOURNAL OF DIFFERENTIAL EQUATIONS

    In this paper we introduce a new compactness condition — Property-(C) — for flows in (not necessary locally compact) metric spaces. For such flows a Conley type theory can be developed. For example (regular) index pairs always exist for Property-(C) flows and a Conley index can be defined. An important class of flows satisfying the this compactness condition are LS-flows. We apply E-cohomology to index pairs of LS-flows and obtain the E-cohomological Conley index. We formulate a continuation principle for the E-cohomological Conley index and show that all LS-flows can be continued to LS-gradient flows. We show that the Morse homology of LS-gradient flows computes the E-cohomological Conley index. We use Lyapunov functions to define the Morse–Conley–Floer cohomology in this context, and show that it is also isomorphic to the E-cohomological Conley index.

  • How much a geometrical model of a honeycomb seal can be simpli ed in the CFD calculation
    • Michał Stajnke
    • Wojciech Włodarski
    2017 Transactions of the Institute of Fluid-Flow Machinery

    This paper presents the inuence of geometry simplication on the results obtained in the computational fluid dynamics simulation. The subject of simulation was part of the honeycomb seal located at the inlet to high pressure part of a steam turbine. There were three different geometrical models assumed in the calculations. First one was two-dimensional case and two others were three dimensional, one with the radius of curvature and one without. Numerical simulations were performed for 15 sets of boundary conditions to compare ow characteristics for each geometrical case.