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Gdańsk University of Technology

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Publications from the year 2018

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  • Ścieki pod ciśnieniem. Przepompownie kanalizacyjne.
    • Ziemowit Suligowski
    2018 Magazyn Instalatora

    Problemy związane z przepompowniami ścieków. Rodzaje obiektów. Bezpieczeństwo techniczne i energetyczne. Problem braku aktualnych standardów.

  • Światło dzienne w projektowaniu? Rezultaty badań ankietowych i ćwiczeń analityczno-projektowych wśród studentów architektury i urbanistyki z tematyki oświetlenia dziennego
    • Natalia Sokół
    • Justyna Martyniuk-Pęczek
    2018

    Artykuł przedstawia wyniki badań ankietowych i ćwiczeń analitycznych dotyczących oceny oświetlenia dziennego (percepcja, wiedza, preferencje) przeprowadzonych wśród 140 studentów architektury. Wyniki mogą sugerować, że percepcja i opis oświetlenia dziennego opierał się na intuicji respondentów. Analiza udzielonych odpowiedzi ilustruje, że na umiejętność krytycznej interpretacji zaobserwowanych warunków oświetlenia i projektowego zastosowania wniosków z analizy oświetleniowej wpływa znajomość parametrów modelowania i oceny światła dziennego.

  • Świeże spojrzenie na sieć kanalizacyjną
    • Ziemowit Suligowski
    2018 Magazyn Instalatora

    Prezentacja nowych rozwiązań służących do budowy i eksploatacji sieci kanalizacyjnych. Nowe rozwiązania w zakresie budowy bezwykopowej kanalizacji grawitacyjnej. Elementy do budowy sieci.

  • Tacit Knowledge Sharing and Value Creation in the Network Economy: Socially Driven Evolution of Business
    • Wioleta Kucharska
    2018

    Key factors which affect competitive advantage in the network economy are innovation, relationships, cooperation, and knowledge. Sharing knowledge is not easy. Companies find it problematic. Presented studies show that the essence of the value creation today is not in sharing explicit but rather tacit knowledge, which is a source of creativity and innovation. Delivering value through knowledge does not only require efficient Transactive Memory Systems (TMS) but most of all a thorough approach to effective human interactions. Thus, to ensure tacit knowledge sharing, human resources management (HRM) needs to focus on the culture of collaboration, whose key element is trust among organization members. The aim of the chapter is to highlight that the network economy driven by knowledge workers as tacit knowledge producers caused the socially driven evolution of business.

  • Tailoring properties of reduced graphene oxide by oxygen plasma treatment
    • Izabela Kondratowicz
    • Małgorzata Nadolska
    • Samet Şahin
    • Marcin Stanisław Łapiński
    • Marta Prześniak-Welenc
    • Mirosław Sawczak
    • Eileen Yu
    • Wojciech Sadowski
    • Kamila Sadowska
    2018 Full text APPLIED SURFACE SCIENCE

    We report an easily controllable, eco-friendly method for tailoring the properties of reduced graphene oxide (rGO) by means of oxygen plasma. The effect of oxygen plasma treatment time (1, 5 and 10 minutes) on the surface properties of rGO was evaluated. Physicochemical characterization using microscopic, spectroscopic and thermal techniques was performed. The results revealed that different oxygen-containing groups (e.g. carboxyl, hydroxyl) were introduced on the rGO surface enhancing its wettability. Furthermore, upon longer treatment time, other functionalities were created (e.g. quinones, lactones). Moreover, external surface of rGO was partially etched resulting in an increase of the material surface area and porosity. Finally, the oxygen plasma-treated rGO electrodes with bilirubin oxidase were tested for oxygen reduction reaction. The study showed that rGO treated for 10 min exhibited twofold higher current density than untreated rGO. The oxygen plasma treatment may improve the enzyme adsorption on rGO electrodes by introduction of oxygen moieties and increasing the porosity.

  • Tailoring structural properties of lanthanum orthoniobates through an isovalent substitution on the Nb-site
    • Sebastian Lech Wachowski
    • Bartosz Kamecki
    • Piotr Winiarz
    • Kacper Dzierzgowski
    • Aleksandra Dorota Mielewczyk-Gryń
    • Maria Gazda
    2018 Full text Inorganic Chemistry Frontiers

    Tetragonal polymorph of lanthanum orthoniobate can be stabilized to room temperature by the substitution of Nb with an isovalent element. LaNb1-xAsxO4 (0 < x ≤ 0.3), where As is an element stabilizing tetragonal structure, were successfully synthesized with combined co-precipitation and solid-state reaction method. The phase transition temperature, above which the material has tetragonal structure, decreases linearly with increasing As-content, and LaNb0.7As0.3O4 is tetragonal at room temperature. The analysis of the influence of different isovalent substituents, namely V, Sb and Ta, has shown that there is a relation between the properties of the chemical element and its effect on the structure. It was proposed that the electronegativity of the substituent determines the type of stabilization – the tetragonal/monoclinic structure is stabilized by chemical elements with electronegativity higher/lower than that of niobium. The slope of the phase transition temperature dependence on the substituent content has been proposed as a parameter determining the “quality” of the stabilization, since steeper function leads to a larger decrease of transition temperature for the same content of different substituents. The analysis has shown that the stabilization of tetragonal structure, apart from the electronegativity, depends also on ionic radius of a substituent. Arsenic has been found to be a better stabilizer of the tetragonal polymorph of lanthanum orthoniobate than Sb, but worse than V.

  • TaRh 2 B 2 and NbRh 2 B 2 : Superconductors with a chiral noncentrosymmetric crystal structure
    • Elizabeth M. Carnicom
    • Weiwei Xie
    • Tomasz Klimczuk
    • Jingjing Lin
    • Karolina Górnicka
    • Zuzanna Sobczak
    • Nai Ong
    • Robert J. Cava
    2018 Full text Science Advances

    It is a fundamental truth in solid compounds that the physical properties follow the symmetry of the crystal structure. Nowhere is the effect of symmetry more pronounced than in the electronic and magnetic properties of materials—even the projection of the bulk crystal symmetry onto different crystal faces is known to have a substantial impact on the surface electronic states. The effect of bulk crystal symmetry on the properties of superconductors is widely appreciated, although its study presents substantial challenges. The effect of a lack of a center of symmetry in a crystal structure, for example, has long been understood to necessitate that the wave function of the collective electron state that gives rise to superconductivity has to be more complex than usual. However, few nonhypothetical materials, if any, have actually been proven to display exotic superconducting properties as a result. We introduce two new superconductors that in addition to having noncentrosymmetric crystal structures also have chiral crystal structures. Because the wave function of electrons in solids is particularly sensitive to the host material’s symmetry, crystal structure chirality is expected to have a substantial effect on their superconducting wave functions. Our two experimentally obtained chiral noncentrosymmetric superconducting materials have transition temperatures to superconductivity that are easily experimentally accessible, and our basic property characterization suggests that their superconducting properties may be unusual. We propose that their study may allow for a more in-depth understanding of how chirality influences the properties of superconductors and devices that incorporate them.

  • TASK CLOUD INFRASTRUCTURE IN THE CENTRE OF INFORMATICS – TRICITY ACADEMIC SUPERCOMPUTER & NETWORK
    • Piotr Orzechowski
    2018 Full text TASK Quarterly

    The cloud solution called the TASK cloud is described. Its main components and the way of their implementation are described. Examples of deployed environments based on the cloud are also presented. Moreover, the idea of combining the cloud and big data platforms is suggested and discussed.

  • Taurine as a water structure breaker and protein stabilizer
    • Piotr Bruździak
    • Aneta Panuszko
    • Emilia Kaczkowska
    • Barnaba Piotrowski
    • Anna Daghir
    • Sebastian Demkowicz
    • Janusz Stangret
    2018 Full text AMINO ACIDS

    The enhancing effect on the water structure has been confirmed for most of the osmolytes exhibiting both stabilizing and destabilizing properties in regard to proteins. The presented work concerns osmolytes, which should be classified as “structure breaking” solutes: taurine and N,N,N-trimethyltaurine (TMT). Here, we combine FTIR spectroscopy, DSC calorimetry and DFT calculations to gain an insight into the interactions between osmolytes and two proteins: lysozyme and ubiquitin. Despite high structural similarity, both osmolytes exert different influence on protein stability: taurine is a stabilizer, TMT is a denaturant. We show also that taurine amino group interacts directly with the side chains of proteins, whereas TMT does not interact with proteins at all. Although two solutes weaken on average the structure of the surrounding water, their hydration spheres are different. Taurine is surrounded by two populations of water molecules: bonded with weak H-bonds around sulfonate group, and strongly bonded around amino group. The strong hydrogen-bonded network of water molecules around the amino group of taurine further improves properties of enhanced protein hydration sphere and stabilizes the native protein form. Direct interactions of this group with surface side chains provide a proper orientation of taurine and prevents the SO3− group from negative influence. The weakened SO3− hydration sphere of TMT breaks up the hydrogen-bonded network of water around the protein and destabilizes it. However, TMT at low concentration stabilize both proteins to a small extent. This effect can be attributed to an actual osmophobic effect which is overcome if the concentration increases.

  • TDOA versus ATDOA for wide area multilateration system
    • Jacek Stefański
    • Jarosław Sadowski
    2018 Full text EURASIP Journal on Wireless Communications and Networking

    This paper outlines a new method of a location service (LCS) in the asynchronous wireless networks (AWNs) where the nodes (base stations) operate asynchronously in relation to one another. This method, called asynchronous time difference of arrival (ATDOA), enables the calculation of the position of the mobile object (MO) through the measurements taken by a set of non-synchronized fixed nodes and is based on the measurement of the virtual distance difference between the reference nodes and the several MO positions (more than two), as well as on the solution of a nonlinear system of equations. The novelty of the proposed solution is using the measurements taken by at least five ground sensors without time synchronization between them to estimate the position of the tracked MO transmitting four or more sounding signals in random time. The new method significantly simplifies the localization process in real-life AWNs. It can be used on its own or to complement the traditional synchronous method. The paper focuses on the description of the proposed ATDOA method, two algorithms TS-LS (Taylor series least-squares) and GA (genetic algorithm) for solving the nonlinear system of equations, example application of the new method for a three-dimensional space, and presentation of the simulation models and simulation results. An important part of the paper is the comparison of the efficiency between the asynchronous method and the synchronous one for wide area multilateration (WAM) system. In addition, the Cramér-Rao lower bound (CRLB) is derived for this problem as a benchmark. The preliminary measurement results obtained by applying the proposed ATDOA method against the background of the synchronous one are presented at the end of the paper. As it could be expected, the synchronous solution gives better results. The synchronous method allows to locate the aircraft within 15 m in about 80% of the time, while the ATDOA method in 74% of the time for the base stations clocked from the reference clocks with the stability equal to 10−9, and in 58% of the time for the base stations clocked from the reference clocks with the stability equal to 10−8. The new method therefore should not be treated as the improvement of the existing synchronous positioning systems but as a backup solution which allows to keep the LCS systems running even during ground stations synchronization failure.

  • Technological substitution in Asia
    • Ewa Lechman
    2018

    This book provides extensive evidence on information and communication technologies development diffusion patterns, unveils specific ‘network effects’ that enhance rapid spread of ICT, and detect major macroeconomic determinants of this process, across 36 Asian economies over the period 1980-2015. Moreover, this research traces country-specific patterns of the unique process. We consider two types of technological substitution, namely: ‘fixed-to-mobile’ type technological substitution process encompasses switching from fixed telephony (‘old technology’) to mobile telephony (‘new technology’); while the ‘fixed-to-wireless’ type technological substitution – switching from fixed (narrowband and/or broadband) fixed Internet networks (‘old technologies’) to wireless (mainly broadband) Internet networks (‘new technologies’). Moreover, this study empirically identifies the potential effect of selected macroeconomic factors, which may potentially enhance dynamic spread of ICT.

  • Technologie dezodoryzacji gazów złowonnych
    • Izabela Wysocka
    • Jacek Namieśnik
    2018 Analityka: Nauka i Praktyka

    Aktywność cżłowieka związana jest z powstawaniem różnego typu zanieczyszczeń i w efekcie można mówić o wzroście antropopresji. Ma to miejsce również w przypadku emisji skladnikow gazowych , ktore charakteryzuja sie nieprzyjemnym zapachem.

  • Technologie recyklingu zużytych i odpadowych modułów fotowoltaicznych I i II generacji
    • Anna Kuczyńska-Łażewska
    2018 Full text

    W związku z rosnącą produkcją modułów fotowoltaicznych i faktem, że czas życia pierwszych montowanych modułów dobiega końca w najbliższej przyszłości na wysypiskach będą zalegać duże ilości zużytych modułów fotowoltaicznych. Odzysk metali z uszkodzonych i zużytych modułów pozwoliłby na obniżenie kosztu produkcji ogniw, oraz na ograniczenie zużycia surowców. I generacja obejmuje moduły wykonane z mono- i polikrystalicznego krzemu, które jako gotowy produkt mają znikomy wpływ na środowisko. Moduły II generacji (tzw. cienkowarstwowe) produkowane są z amorficznego krzemu, tellurku kadmu (CdTe), oraz dwuselenku miedziowo(-galowo)-indowego (CI(G)S). Zawierają one metale ciężkie, które pod koniec życia modułu mogą być wymywane do środowiska. Dlatego też opracowanie technologii recyklingu zużytych i uszkodzonych modułów nowszych generacji jest ważne ze względów środowiskowych. Celem przeprowadzonych badań było opracowanie metody efektywnego usuwania metali z uszkodzonych modułów fotowoltaicznych. Zwrócono uwagę na dobór procesu delaminacji, jako kluczowego etapu w technologii recyklingu modułów PV. Opracowano technologię usuwania metalizacji z ogniw krzemowych wraz z procesem odzysku srebra. Sprawdzono również możliwość wykorzystania w procesach recyklingu past trawiących nie zawierających HF. Zbadano alternatywy recyklingu materiałowego całych modułów II generacji wykonanych z CdTe. Duży nacisk jest kładziono na prośrodowiskowy charakter opracowywanej technologii.

  • Telomeraza jako cel terapii przeciwnowotworowej
    • Natalia Maciejewska
    2018

    Telomeraza jako cel terapii przeciwnowotworowej

  • Temper bead welding of S460N steel in wet welding conditions
    • Jacek Tomków
    • Dariusz Fydrych
    • Grzegorz Rogalski
    • Jerzy Łabanowski
    2018 Full text Advances in Materials Science

    Wet welding is the most common method of welding in water environment. It is most often used for repairing of underwater parts of offshore structures. However, the water as a welding environment causes an increase of susceptibility of steels to cold cracking. For underwater constructions high strength low alloy (HSLA) steel are widely used. In wet welding condition a HSLA steel is characterized by high susceptibility to cold cracking. Temper Bead Welding (TBW) was chosen as a method to improve the weldability of S460N steel. The studies showed that TBW technique causes significant decrease of maximum hardness of heat affected zone (HAZ). The largest decrease in hardness occurred in specimens with the pitches in range 66-100%.

  • Temperature influence on tyre/road noise on poroelastic road surface based on laboratory measurements
    • Piotr Mioduszewski
    • Stanisław Taryma
    • Ryszard Woźniak
    2018 Full text

    The temperature effect on measured tyre/road noise is very important phenomena as it may lead to significant errors in measurement results due to substantial influence of this parameter on the obtained values. It depends mainly on the particular tyre-road combination. It is different for dense and porous as well as for bituminous and cement concrete pavements. It differs also depending on tested tyre. The correction procedure for normalizing measured noise levels to a reference air temperature of 20 oC is given in the recently published ISO Technical Specification ISO/TS 13471-1:2017 – Correction for temperature when testing with the CPX method. The temperature correction coefficients defined in the Technical Specification differ to some extent depending on the main type and condition (porosity) of a road surface. They are equal for both standard reference tyres and they slightly depend linearly on speed. An extensive study dealing with temperature influence on tyre/road noise on poroelastic road surface was conducted in the laboratory of Gdansk University of Technology in Poland. The aim of this study was to define the temperature correction coefficients for this special - extremely quiet road surface and for various tyres (including two standard reference tyres). Noise measurements using the CPX method were performed at roadwheel facilities equipped with poroelastic road surface for twelve passenger car and for two truck tyres within the air temperature range from 6 to 36 ºC. The results and findings of this experiment are presented and discussed in this paper.

  • Temperature influences on shear stability of a nanosize plate with piezoelectricity effect
    • Mohammad Malikan
    2018 Full text Multidiscipline Modeling in Materials and Structures

    Purpose The purpose of this paper is to predict the mechanical behavior of a piezoelectric nanoplate under shear stability by taking electric voltage into account in thermal environment. Design/methodology/approach Simplified first-order shear deformation theory has been used as a displacement field. Modified couple stress theory has been applied for considering small-size effects. An analytical solution has been taken into account for various boundary conditions. Findings The length scale impact on the results of any boundary conditions increases with an increase in l parameter. The effect of external electric voltage on the critical shear load is more than room temperature effects. With increasing aspect ratio the critical shear load decreases and external electric voltage becomes more impressive. By considering piezoelectric nanoplates, it is proved that the temperature rise cannot become a sensitive factor on the buckling behavior. The length scale parameter has more effect for more flexible boundary conditions than others. By considering nanosize, the consideration has led to much bigger critical load vs macro plate. Originality/value In the current paper for the first time the simplified first-order shear deformation theory is used for obtaining governing equations by using nonlinear strains for shear buckling of a piezoelectric nanoplate. The couple stress theory for the first time is applied on the nonlinear first-order shear deformation theory. For the first time, the thermal environment effects are considered on shear stability of a piezoelectric nanoplate.

  • Tensor Decomposition for Imagined Speech Discrimination in EEG
    • Jesus Garcia Salinas
    • Luis Villaseñor-Pineda
    • Carlos A. Reyes-Garćia
    • Alejandro A. Torres-García
    2018 LECTURE NOTES IN COMPUTER SCIENCE

    Most of the researches in Electroencephalogram(EEG)-based Brain-Computer Interfaces (BCI) are focused on the use of motor imagery. As an attempt to improve the control of these interfaces, the use of language instead of movement has been recently explored, in the form of imagined speech. This work aims for the discrimination of imagined words in electroencephalogram signals. For this purpose, the analysis of multiple variables of the signal and their relation is considered by means of a multivariate data analysis, i.e., Parallel Factor Analysis (PARAFAC). In previous works, this method has demonstrated to be useful for EEG analysis. Nevertheless, to the best of our knowledge, this is the first attempt to analyze imagined speech signals using this approach. In addition, a novel use of the extracted PARAFAC components is proposed in order to improve the discrimination of the imagined words. The obtained results, besides of higher accuracy rates in comparison with related works, showed lower standard deviation among subjects suggesting the effectiveness and robustness of the proposed method. These results encourage the use of multivariate analysis for BCI applications in combination with imagined speech signals.

  • Termiczne metody utylizacji odpadów medycznych
    • Roksana Bochniak
    • Aleksandra Gołąbek
    • Jan Wajs
    2018 Technika Chłodnicza i Klimatyzacyjna

    W artykule przedstawiono dopuszczone przez polskie prawo metody unieszkodliwiania odpadów medycznych, ze szczególnym wyróżnieniem najczęściej stosowanych metod termicznych. Omówiono wytyczne dla prowadzenia procesu utylizacji odpadów w instalacji termicznej przeróbki odpadów. W końcowej części publikacji opisane zostały dwie jednostki przeznaczone do utylizowania odpadów medycznych, tj. instalacja w Zakładzie Utylizacji Odpadów Medycznych przy Centrum Onkologii im. prof. F. Łukaszczyka w Bydgoszczy oraz Spalarnia Odpadów Przemysłowych i Medycznych Raf-Ekologia Sp. z o.o. w Jedliczu.

  • Ternary Bismuthide SrPtBi2: Computation and Experiment in Synergism to Explore Solid-State Materials
    • Xin Gui
    • Xin Zhao
    • Zuzanna Sobczak
    • Cai-Zhuang Wang
    • Tomasz Klimczuk
    • Kai-Ming Ho
    • Weiwei Xie
    2018 Journal of Physical Chemistry C

    A combination of theoretical calculation and the experimental synthesis to explore the new ternary compound is demonstrated in the Sr–Pt–Bi system. Because Pt–Bi is considered as a new critical charge-transfer pair for superconductivity, it inspired us to investigate the Sr–Pt–Bi system. With a thorough calculation of all the known stable/metastable compounds in the Sr–Pt–Bi system and crystal structure predictions, the thermodynamic stability of hypothetical stoichiometry, SrPtBi2, is determined. Following the high-temperature synthesis and crystallographic analysis, the first ternary bismuthide in Sr–Pt–Bi, SrPtBi2 was prepared, and the stoichiometry was confirmed experimentally. SrPtBi2 crystallizes in the space group Pnma (S.G. 62, Pearson Symbol oP48), which matches well with theoretical prediction using an adaptive genetic algorithm. Using first-principles calculations, we demonstrate that the orthorhombic structure has lower formation energies than other 112 structure types, such as tetragonal BaMnBi2 (CuSmP2) and LaAuBi2 (CuHfSi2) structure types. The bonding analysis indicates that the Pt–Bi interactions play a critical role in structural stability. The physical property measurements show the metallic properties at the low temperature, which agrees with the electronic structure assessment.