Publications Repository - Gdańsk University of Technology

Page settings

polski
Publications Repository
Gdańsk University of Technology

Show publications from the year

Publications from the year 2016

Show all
  • Digital microcontroller for sonar waveform generator
    • Aleksander Schmidt
    • Jan Schmidt
    2016 Full text HYDROACOUSTICS

    Generating sounding signals is essential for the operation of active sonar. The system should be highly reliable. This can be achieved through architecture, communication between the devices, and a well-designed and self–testing software. The system presented in the article is responsible for the generation of hydroacoustic sounding signals, and ensures proper interaction between power amplifiers and power supplies. Thanks to its structure, the system ensures a very stable generation of many complex sounding signals in the form of linear or hyperbolic frequency modulated pulses (up or down), continuous transmission wave with increasing frequency and others. It is used in the mine-countermeasure sonar, but can also be used in other types of hydroacoustic systems which require complex sounding signals. The article describes possible technical solutions and sounding signals.

  • Digital Public Service Innovation: Framework Proposal
    • John Bertot
    • Elsa Estevez
    • Tomasz Janowski
    2016

    This paper proposes the Digital Public Service Innovation Framework that extends the "standard" provision of digital public services according to the emerging, enhanced, transactional and connected stages underpinning the United Nations Global e-Government Survey, with seven example "innovations" in digital public service delivery -- transparent, participatory, anticipatory, personalized, co-created, context-aware and context-smart. Unlike the "standard" provisions, innovations in digital public service delivery are open-ended -- new forms may continuously emerge in response to new policy demands and technological progress, and are non-linear -- one innovation may or may not depend on others. The framework builds on the foundations of public sector innovation and Digital Government Evolution model. In line with the latter, the paper equips each innovation with sharp logical characterization, body of research literature and real-life cases from around the world to simultaneously serve the illustration and validation goals. The paper also identifies some policy implications of the framework, covering a broad range of issues from infrastructure, capacity, eco-system and partnerships, to inclusion, value, channels, security, privacy and authentication.

  • Dilemmas of Identity in Contemporary Cities. The City of Gdansk as an Example
    • Jakub Szczepański
    • Małgorzata Dymnicka
    2016 Full text Procedia Engineering

    The article is aimed to answer the question how, depending on the historical heritage, the collective memory, the physical space of the city and their images were shaped, through the politics of memory. All known cultures and languages distinguish the ‘self’ and the ‘other’, ‘us’ and ‘them’. Neither do we know cities which wish to differ in some particular way, although they can have numerous identities. Their multitude and diversity may be a source of conflicts or contradictions in a creating their coherent image. From a sociological perspective, all identities are constructed. The real problem, however, is how, with what, by whom, and for what? Although identities are not time-proof, in favourable circumstances, they legitimize and rationalize dominant institutions of authority and culture. The public discourse on memory and identity of the modern Gdansk is dominated by multiparadigmatism, going beyond the authenticity of the material and cultural heritage and the state of knowledge presented by historians. Metaphoric and discursive ideas, already encoded in the language, such as: Gdansk is a multicultural city; the city of freedom and the city of solidarity are used to demonstrate the multiparadigmatism. Analysis has proved that the identity narrations were built mainly on myth-making constructions, especially on the myth of ‘the Golden Age’. Nowadays, the selections of architectural forms, used as a base for the Gdansk's identities, have been extending with buildings from the Polish People's Republic (1945-1989) period. Their aesthetic and historic values were, until recently, almost completely negated. It was an unwanted heritage.

  • DIRECTIONS OF THE SCIENTIFIC RESEARCH CONDUCTED IN THE DEPARTMENT OF MARINE AND POWER PLANTS OF THE FACULTY OF OCEAN ENGINEERING AND SHIP TECHNOLOGY OF THE GDANSK UNIVERSITY OF TECHNOLOGY
    • Zbigniew Korczewski
    2016 Full text Journal of Polish CIMEEAC

    In this article the short historical outline of the Department of Marine and Land Power Plants of the Faculty of Ocean Engineering and Ship Technology of the Gdansk University of Technology was introduced. Its activity beginnings, in the post-war history of the University, reach 1952. The leading scientific issues, which have been developed for years in three principal directions: design, manufacture and operation of machines and devices installed into marine and land power plants as well as into different type of the offshore power plants. There was given a special focus on the Professors' profiles executing official duties of the Head of the Department (Division) of Marine Power Plants (Marine and Land Power Plants). They were creating its development policy over the last 60 years bringing a substantial contribution towards the present intellectual and laboratory potential, not only to the Department, but also to the Faculty and University.

  • Disappearing Bridge
    • Hanna Obracht-Prondzyńska
    • Slawomir Zbikowski
    • Raisa Sakharuk
    • Gert Salzer
    • Charlotte Brandt
    2016

    The main parts of the Hafen City’s residential development are still under construction. Close by, uninviting offi ce buildings defi ne Hammerbrook. Neighboring Rothenburgsort is inhabited by many citizens but lacks cultural attractions. Street traffic and water barriers distinctly separate the districts.

  • Disaster-resilient communication networks: Principles and best practices
    • Andreas Mauthe
    • David Hutchison
    • Egemen Cetinkaya
    • Ivan Ganchev
    • Jacek Rak
    • James P.G. Sterbenz
    • Matthias Gunkelk
    • Paul Smith
    • Teresa Gomes
    2016

    Communication network failures that are caused by disasters, such as hurricanes, arthquakes and cyber-attacks, can have significant economic and societal impact. To address this problem, the research community has been investigating approaches to network resilience for several years. However, aside from well-established techniques, many of these solutions have not found their way into operational environments. The RECODIS COST Action aims to address this shortcoming by providing solutions that are tailored to specific types of challenge, whilst considering the wider socio-economic issues that are associated with their deployment. To support this goal, in this paper, we present an overview of some of the foundational related work on network resilience, covering topics such as measuring resilience and resilient network architectures, amongst others. In addition, we provide insights into current operational best practices for ensuring the resilience of carrier-grade communication networks. The aim of this paper is to support the goals of the EU COST Action RECODIS and the wider research community in engineering more resilient communication networks.

  • Discrete random variables in reliability calculations of a reticulated shell
    • Przemysław Sorn
    • Jarosław Górski
    • Karol Winkelmann
    • Jarosław Przewłócki
    2016

    Implementation of the Point Estimation Method (PEM) in the reliability analysis of a three-dimensional truss structure is presented in the paper. The influence of geometric and material random parameters on the truss load-carrying capacity was investigated. The analysis was performed for different combinations of basic variables. Symmetric and asymmetric cases of snow load were taken to assess the structural reliability. Sensitivity of the structural response to cross-sectional area was also taken into account. The obtained results were compared with the Monte Carlo and Response Surface Method calculations.

  • Discrete-time estimation of nonlinear continuous-time stochastic systems
    • Mariusz Domżalski
    • Zdzisław Kowalczuk
    2016

    In this paper we consider the problem of state estimation of a dynamic system whose evolution is described by a nonlinear continuous-time stochastic model. We also assume that the system is observed by a sensor in discrete-time moments. To perform state estimation using uncertain discrete-time data, the system model needs to be discretized. We compare two methods of discretization. The first method uses the classical forward Euler method. The second method is based on the continuous-time simulation of the deterministic part of the nonlinear system between consecutive times of measurement. For state estimation we apply an unscented Kalman Filter, which - as opposed to the well known Extended Kalman Filter - does not require calculation of the Jacobi matrix of the nonlinear transformation associated with this method.

  • Discrimination of Apple Liqueurs (Nalewka) Using a Voltammetric Electronic Tongue, UV-Vis and Raman Spectroscopy
    • Magdalena Śliwińska
    • Celia Garcia-hernandez
    • Mikołaj Kościński
    • Tomasz Dymerski
    • Waldemar Wardencki
    • Jacek Namieśnik
    • Małgorzata Śliwińska-Bartkowiak
    • Stefan Jurga
    • Cristina Garcia-Cabezon
    • Maria Luz Rodriguez-Mendez
    2016 Full text SENSORS

    The capability of a phthalocyanine-based voltammetric electronic tongue to analyze strong alcoholic beverages has been evaluated and compared with the performance of spectroscopic techniques coupled to chemometrics. Nalewka Polish liqueurs prepared from five apple varieties have been used as a model of strong liqueurs. Principal Component Analysis has demonstrated that the best discrimination between liqueurs prepared from different apple varieties is achieved using the e-tongue and UV-Vis spectroscopy. Raman spectra coupled to chemometrics have not been efficient in discriminating liqueurs. The calculated Euclidean distances and the k-Nearest Neighbors algorithm (kNN) confirmed these results. The main advantage of the e-tongue is that, using PLS-1, good correlations have been found simultaneously with the phenolic content measured by the Folin–Ciocalteu method (R2 of 0.97 in calibration and R2 of 0.93 in validation) and also with the density, a marker of the alcoholic content method (R2 of 0.93 in calibration and R2 of 0.88 in validation). UV-Vis coupled with chemometrics has shown good correlations only with the phenolic content (R2 of 0.99 in calibration and R2 of 0.99 in validation) but correlations with the alcoholic content were low. Raman coupled with chemometrics has shown good correlations only with density (R2 of 0.96 in calibration and R2 of 0.85 in validation). In summary, from the three holistic methods evaluated to analyze strong alcoholic liqueurs, the voltammetric electronic tongue using phthalocyanines as sensing elements is superior to Raman or UV-Vis techniques because it shows an excellent discrimination capability and remarkable correlations with both antioxidant capacity and alcoholic content—the most important parameters to be measured in this type of liqueurs.

  • Discriminatory expressions, the young and social networks: The effect of gender
    • David Dueñas-Cid
    • Paloma Pontón-Merino
    • Ángel Belzunegui-Eraso
    • Inma Pastor-Gosálbez
    2016 Full text Comunicar Latin American Scientific Journal of communication and Education

    In the framework of the «Project I: CUD» (Internet: Creatively Unveiling Discrimination), carried out in the United Kingdom, Italy, Belgium, Romania and Spain, we conducted a study into the expressions of discrimination used by young people on social network sites. To do so we designed a methodological strategy for detecting discriminatory content in 493 Facebook profiles and used this strategy to collect 363 examples for further analysis. Our aims were to compile information on the various types of discriminatory content and how they function online in order to create tools and strategies that can be used by trainers, teachers and families to combat discrimination on the Internet. Through this study we have detected patterns between young men and young women that reveal that there is a feminine and a masculine way of behaving on the Internet and that there are different ways of expressing discrimination on social networks sites. Men tend to be more direct in their posting and sharing of messages. Their messages, which are also more clearly discriminatory, focus more on discrimination towards ethnic groups and cultural minorities. Women, on the other hand, tend to use indirect (reactive) discriminatory strategies with a less obvious discriminatory component that mainly focuses on sociocultural status and physical appearance.

  • Dissociative electron attachment to the radiosensitizing chemotherapeutic agent hydroxyurea
    • S .e. Huber
    • Małgorzata Śmiałek-Telega
    • K. Tanzer
    • Stephan Denifl
    2016 Full text JOURNAL OF CHEMICAL PHYSICS

    Dissociative electron attachment to hydroxyurea was studied in the gas phase for electron energies ranging from zero to 9 eV in order to probe its radiosensitizing capabilities. The experiments were carried out using a hemispherical electron monochromator coupled with a quadrupole mass spectrometer. Diversified fragmentation of hydroxyurea was observed upon low energy electron attachment and here we highlight the major dissociation channels. Moreover, thermodynamic thresholds for various fragmentation reactions are reported to support the discussion of the experimental findings. The dominant dissociation channel, which was observed over a broad range of energies, is associated with formation of NCO−, water, and the amidogen (NH2) radical. The second and third most dominant dissociation channels are associated with formation of NCNH− and NHCONH2 −, respectively, which are both directly related to formation of the highly reactive hydroxyl radical. Other ions observed with significant abundance in the mass spectra were NH2 −/O−, OH−, CN−, HNOH−, NCONH2 −, and ONHCONH2 −.

  • Dissociative multi-photon ionization of isolated uracil and uracil-adenine complexes
    • M. Ryszka
    • R. Pandey
    • C. Rizk
    • J. Tabet
    • B. Barc
    • Marcin Dampc
    • N.j. Mason
    • S. Eden
    2016 INTERNATIONAL JOURNAL OF MASS SPECTROMETRY

    Recent multi-photon ionization (MPI) experiments on uracil revealed a fragment ion at m/z 84 that was proposed as a potential marker for ring opening in the electronically excited neutral molecule. The present MPI measurements on deuterated uracil identify the fragment as C3H4N2O+ (uracil+ less CO), a plausible dissociative ionization product from the theoretically predicted open-ring isomer. Equivalent measurements on thymine do not reveal an analogous CO loss channel, suggesting greater stability of the excited DNA base. MPI and electron impact ionization experiments have been carried out on uracil-adenine clusters in order to better understand the radiation response of uracil within RNA. Evidence for C3H4N2O+ production from multi-photon-ionized uracil-adenine clusters is tentatively attributed to a significant population of π-stacked configurations in the neutral beam.

  • Distinctive facades of commercial buildings and the quality of public space,
    • Elżbieta Ratajczyk-Piątkowska
    2016

    Mutual relations between the retail center and public spaces of the city are varied. They depend on the type and size of the commercial structure. Other ones are for multifunctional shopping centers and other for high streets. In megastores and shopping malls the essential for their functioning is their interior and entrance, which is sometimes the only place of interpenetration of the commercial structure with the surrounding public space. The facades of these buildings due to their size and limited access of natural light, caused by technological and commercial limitation make the problem for composition and form a barrier between the interior of the mall and the surrounding public space. In the area of shopping streets, we may talk about specific integration of public space and individual shops through their shops windows and entrance. However, from the nineteenth century onwards in commercial architecture appeared the elevations having a distinctive architectural elements in the frontages shopping streets. These are the facades of drawing the attention with innovative solutions compositional, structural and material. In the twenty-first century in Europe there are commercial buildings, which by its uniqueness is not only factor of trading brand identification, but also become architectural icons. They chart new directions in shaping facades. The study was based on literature on the subject, data featured on websites and own materials collected during study trips, such as inventories, drawings and photographs. The thesis was put that the unique facades of modern commercial facilities become identifiers of public space in which they are placed. The analysis embraces building Prada in Tokyo, Glass Farm in Schijndel, shopping center Grand Sud Waves of Metz and Markthal in Rotterdam. It has been shown that the uniqueness of elevation solutions affect: 1 / way of shaping public spaces in the vicinity of a commercial facility; 2 / the diversity of merging areas of trade and public space; 3 / identifying a location of the object as a distinguishing feature of the public space.

  • Distributed Evacuation in Graphs with Multiple Exits
    • Piotr Borowiecki
    • Shantanu Das
    • Dariusz Dereniowski
    • Łukasz Kuszner
    2016

    We consider the problem of efficient evacuation using multiple exits. We formulate this problem as a discrete problem on graphs where mobile agents located in distinct nodes of a given graph must quickly reach one of multiple possible exit nodes, while avoiding congestion and bottlenecks. Each node of the graph has the capacity of holding at most one agent at each time step. Thus, the agents must choose their movements strategy based on locations of other agents in the graph, in order to minimize the total time needed for evacuation. We consider two scenarios: (i) the centralized (or offline) setting where the agents have full knowledge of initial positions of other agents, and (ii) the distributed (or online) setting where the agents do not have prior knowledge of the location of other agents but they can communicate locally with nearby agents and they must modify their strategy in an online fashion while they move and obtain more information. In the former case we present an offline polynomial time solution to compute the optimal strategy for evacuation of all agents. In the online case, we present a constant competitive algorithm when agents can communicate at distance two in the graph. We also show that when the agents are heterogeneous and each agent has access to only a subgraph of the original graph then computing the optimal strategy is NP-hard even with full global knowledge. This result holds even if there are only two types of agents.

  • Distributed measurement system with data transmission secured using XXTEA algorithm
    • Grzegorz Lentka
    • Sławomir Tyborczyk
    2016 Full text Przegląd Elektrotechniczny

    The paper deals with wireless data transmission security in the distributed measurement and control system. An overview of cryptographic algorithms was presented paying special attention to the algorithm dedicated to units with low processing power, which is important due to minimization of energy consumption. Measurement modules equipped with simple microcontrollers send data wirelessly to the central unit. The transmission was secured using modified XXTEA algorithm assuring low requirements for resource usage.

  • Diversity and distribution of Tardigrada in Arctic cryoconite holes
    • Krzysztof Zawierucha
    • Marta Ostrowska
    • Tobias Vonnahme
    • Miloslav Devetter
    • Adam Nawrot
    • Sara Lehmann-Konera
    • Małgorzata Kolicka
    2016 Full text JOURNAL OF LIMNOLOGY

    Despite the fact that glaciers and ice sheets have been monitored for more than a century, knowledge on the glacial biota remains poor. Cryoconite holes are water-filled reservoirs on a glacier’s surface and one of the most extreme ecosystems for microinvertebrates. Tardigrada, also known as water bears, are a common inhabitant of cryoconite holes. In this paper we present novel data on the morphology, diversity, distribution and role in food web of tardigrades on Arctic glaciers. From 33 sampled cryoconite holes of 6 glacierson Spitsbergen, in 25 tardigrades were found and identified. Five taxa of Tardigrada (Eutardigrada) were found in the samples, they are: Hypsibius dujardini, Hypsibius sp. A, Isohypsibius sp. A., Pilatobius recamieri, and one species of Ramazzottiidae. H. dujardini and P. recamieri were previously known from tundra in the Svalbard archipelago. Despite the number of studies on Arctic tundra ecosystems, Hypsibius sp. A, one species of Ramazzottiidae and Isohypsibius sp. A are known only from cryoconite holes. Tardigrade found in this study do not falsify the hypothesis that glaciers and ice sheets are a viable biome (characteristic for biome organisms assemblages - tardigrades). Diagnosis of Hypsibius sp. A, Isohypsibius sp. A, and species of Ramazzottiidae with discussion on the status of taxa, is provided. To check what analytes are associated with the presence of tardigrades in High Arctic glacier chemical analyses were carried out on samples taken from the Buchan Glacier. pH values and the chemical composition of anions and cations from cryoconite hole water from the Buchan Glacier are also presented. The current study on the Spitsbergen glaciers clearly indicates that tardigrade species richness in cryoconite holes is lower than tardigrade species richness in Arctic tundra ecosystems, but consists of unique cryoconite hole species. As cryoconite tardigrades may feed on bacteria as well as algae, they are primary consumers and grazers - secondary consumers of the decomposer food chain in this extreme ecosystem.

  • Dlaczego Politechnika Gdańska nie uzyskuje oceny wyróżniającej w akredytacji PKA?
    • Agnieszka Lendzion
    2016 Dzień Jakości PG

    Publikacja stanowi analizę uwag w ocenie instytucjonalnej pięciu wydziałów PG, sformułowanych przez Zespoły Oceniające PKA w raportach z wizytacji na Politechnice Gdańskiej w latach 2011–2015. Sformułowano zalecenia dla PG, których wdrożenie mogłoby wpłynąć na poprawę jakości kształcenia na wydziałach, a długofalowo przyczynić się do uzyskanie oceny wyróżniającej w akredytacji PKA.

  • Długi opad nawalny
    • Ziemowit Suligowski
    2016 Magazyn Instalatora

    Omówienie opadu krytycznego w lipcu 2016 r. Problem nieprzewidywalności oraz wyjątkowo długiego trwania opadu. Nieuniknione konsekwencje. Czy można było im zapobiec?

  • Długookresowe wahania przepływów rocznych głównych rzek w Polsce i ich związek z cyrkulacją termohalinową Atlantyku Północnego
    • Andrzej A. Marsz
    • Anna Styszyńska
    • Wiesława Ewa Krawczyk
    2016 Full text Przegląd Geograficzny

    Praca dotyczy przyczyn występowania multidekadowej zmienności średnich rocznych przepływów największych rzek Polski (Wisła, Bug, Odra, Warta). Taka zmienność powoduje, że w wieloletnich przebiegach przepływów rocznych zaznaczają się zmiany znaków trendów (z dodatnich na ujemne i odwrotnie). Przyczyną jest długookresowa zmienność składowej powierzchniowej cyrkulacji termohalinowej na północnym Atlantyku (NA THC – Northern Atlantic Thermohaline Circulation), która, poprzez wymuszanie zmian charakteru cyrkulacji atmosferycznej, reguluje zmienność temperatury powietrza nad Europą Środkową. Podczas występowania dodatnich faz NA THC przepływy roczne rzek maleją, zmniejsza się również zakres zmienności międzyrocznej oraz rośnie prawdopodobieństwo wystąpienia przepływów niskich. W okresie ujemnych faz NA THC przepływy rosną i rośnie zakres ich zmienności. Przeciętne różnice przepływów rocznych między okresami z występowaniem dodatnich a ujemnych faz NA THC wynoszą około 10%. Wzrost temperatury powietrza w czasie dodatnich faz NA THC, silny zwłaszcza w kwietniu, lipcu i sierpniu, powoduje wzrost ewapotranspiracji w zlewniach, co zmniejsza wartości odpływu. Nie można wykluczyć, że zmienność NA THC w znaczącym stopniu wpływa również na częstość występowania susz w Polsce

  • Do morphometric parameters and geological conditions determine chemistry of glacier surface ice? Spatial distribution of contaminants present in the surface ice of Spitsbergen glaciers (European Arctic)
    • Sara Lehmann-Konera
    • Grzegorz Gajek
    • Stanisław Chmiel
    • Żaneta Polkowska
    2016 ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

    Abstract The chemism of the glaciers is strongly determined by long-distance transport of chemical substances, and their wet and dry deposition on the glacier surface. This paper concerns spatial distribution of metals, ions, and dissolved organic carbon, as well as the differentiation of physicochemical parameters (pH, electrical conductivity) determined in ice surface samples collected from four Arctic glaciers during the summer season 2012. The studied glaciers represent three different morphological types: ground based (Blomlibreen and Scottbreen), tidewater which evolved to ground based (Renardbreen), and typical tidewater glacier (Recherchebreen). All of the glaciers are functioning as a glacial system, hence, are subject to the same physical processes (melting, freezing), and the process of ice flowing resulting from the cross-impact force of gravity and topographic conditions. According to this hypothesis the article discusses the correlation between morphometric parameters, changes in mass balance, geological characteristics of the glaciers and the spatial distribution of analytes in their surface ice. A strong correlation (r=0.63) is recorded between the aspect of glaciers and values of pH and ions, whereas DOC depends on the minimum elevation of glaciers (r=0.55), and most probably also on the development of the accumulation area. The obtained results suggest that although certain morphometric parameters largely determine the spatial distribution of analytes, also the geology of the bed of glaciers strongly affects the chemism of the surface ice of glaciers in the phase of strong recession.