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Gdańsk University of Technology

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Publications from the year 2016

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  • Cost-efficient simulation-driven design of compact impedance matching transformers
    • Adrian Bekasiewicz
    • Sławomir Kozieł
    2016

    In this paper, an algorithmic framework for cost-efficient design optimization of miniaturized impedance matching transformers has been presented. Our approach exploits a bottom-up design that involves translating the overall design specifications for the circuit at hand to its elementary building blocks (here, compact microstrip resonant cells, CMRCs), as well as fast surrogate-assisted optimization of the cells followed by simulation-based tuning of the entire transformer structure. The last stage involves local response surface approximation models and space mapping for model correction. The proposed technique is illustrated using two wideband transformers, a three- and a four-section one. In both cases, the optimization cost corresponds to just a few dozen of full-wave simulations of the respective structures despite a relatively large number of geometry parameters to be adjusted.

  • Coupled inductors based filter for matrix converters
    • Ryszard Strzelecki
    • Tomasz Sak
    • Lukasz Roslaniec
    • Zolov Dmitrovic
    • Natalia Strzelecka
    2016

    The use of the coupled inductors in the multipulse matrix converter (MC) systems is described in the paper. The possible arrangements of the system are given together with the description of their operation parameters. Moreover, the influence of the system’s topology on the output power quality is also presented. The invented converter structures evaluation results are given in the form of simulation tests acquired output waveforms for different arrangements.

  • Coupled Urban Areas Inundation Model with Interaction Between Storm Water System and Surface Flow - Case Study of Sea Level Impact on Seaside Areas Flooding
    • Jakub Hakiel
    • Michał Szydłowski
    • Dariusz Gąsiorowski
    2016

    Inundations are becoming more frequent than ever. What is connected with increasing area of impervious surface in cities. This makes predicting urban flooding and its scale especially important. At the seaside we observe additional conditions such as sea level that makes accurate numerical modelling of issue even harder. With complex approach to the matter which is simultaneous calculation of storm water conduit flow and overland flow we can improve obtained results. In this paper we will present coupled model for urban flooding modelling which consist of three components: 1D storm sewage flow, 1D surface flow and interaction between models. Pipe flow will be calculated by solving The Saint-Venant equations using finite difference method (FDM) explicit TVD-McCormack scheme. Which is the modified version of classic McCormack scheme that can be used to capture sharp discontinuities moving along the sewage. Whereas the overland flow will be described by solving 1D nonlinear diffusive wave equation with modified finite element method.

  • CPLFD-GDPT5: High-resolution gridded daily precipitation and temperature data set for two largest Polish river basins
    • Tomasz Edward Berezowski
    • Mateusz Szcześniak
    • Ignacy Kardel
    • Robert Michałowski
    • Tomasz Okruszko
    • Abdelkader Mezghani
    • Mikołaj Piniewski
    2016 Full text Earth System Science Data

    The CHASE-PL (Climate change impact assessment for selected sectors in Poland) Forcing Data–Gridded Daily Precipitation & Temperature Dataset–5 km (CPLFD-GDPT5) consists of 1951–2013 daily minimum and maximum air temperatures and precipitation totals interpolated onto a 5 km grid based on daily meteorological observations from the Institute of Meteorology and Water Management (IMGW-PIB; Polish stations), Deutscher Wetterdienst (DWD, German and Czech stations), and European Climate Assessment and Dataset (ECAD) and National Oceanic and Atmosphere Administration–National Climatic Data Center (NOAA-NCDC) (Slovak, Ukrainian, and Belarusian stations). The main purpose for constructing this product was the need for long-term aerial precipitation and temperature data for earth-system modelling, especially hydrological modelling. The spatial coverage is the union of the Vistula and Oder basins and Polish territory. The number of available meteorological stations for precipitation and temperature varies in time from about 100 for temperature and 300 for precipitation in the 1950s up to about 180 for temperature and 700 for precipitation in the 1990s. The precipitation data set was corrected for snowfall and rainfall under-catch with the Richter method. The interpolation methods were kriging with elevation as external drift for temperatures and indicator kriging combined with universal kriging for precipitation. The kriging cross validation revealed low root-mean-squared errors expressed as a fraction of standard deviation (SD): 0.54 and 0.47 for minimum and maximum temperature, respectively, and 0.79 for precipitation. The correlation scores were 0.84 for minimum temperatures, 0.88 for maximum temperatures, and 0.65 for precipitation. The CPLFD-GDPT5 product is consistent with 1971–2000 climatic data published by IMGW-PIB. We also confirm good skill of the product for hydrological modelling by performing an application using the Soil and Water Assessment Tool (SWAT) in the Vistula and Oder basins.

  • CREATING A RANKING OF DIAGNOSTIC PARAMETERS FOR THE DYNAMIC PROCESS OF A MARINE COMBUSTION ENGINE IN THE ASPECT OF MULTI-CRITERIA EVALUATIONS
    • Ryszard Zadrąg
    2016 Full text Journal of Polish CIMEEAC

    The change of some of the engine’s structural parameters affects the change of toxic compound emission in exhaust gases. It mainly applies to the damage sustained by the charge exchange system as well as the fuel system and the engine supercharging system. These changes are definitely higher during dynamic states and the related transient states. As such, it is possible to speak of a diverse sensitivity of the diagnostic parameters on the exact same excitations which come from the structure of the engine but are realized in other states of load. Presented in the paper is the diagnostic model of an engine, based on the theory of multi-equation models, in which the diagnostic symptoms are the indices and characteristics of exhaust gas compound emissions. For the sake of this paper, the modal value of the structure parameters was assumed to be the change in the angle of the fuel injection advancement. The diagnostic model of the engine was supplemented with the results of research conducted on a station equipped with a single cylinder CI test engine. In previous works of the author, the information capacity index method (the Hellwig method) was suggested for the measurement of sensitivity of a diagnostic parameter. Based on this method, a ranking of diagnostic parameters can be created, which divides the set of diagnostic transients into stimulators, destimulators and nominants. This normalization of the set seems to be helpful while making a diagnostic decision.

  • Criteria for selection of working fluid in low-temperature ORC
    • Dariusz Mikielewicz
    • Jarosław Mikielewicz
    2016 Full text Chemical and Process Engineering : New Frontiers

    The economics of an ORC system is strictly linked to thermodynamic properties of the working fluid. A bad choice of working fluid could lead to a less efficient and expensive plant/generation unit. Some selection criteria have been put forward by various authors, incorporating thermodynamic properties, provided in literature but these do not have a general character. In the paper a simple analysis has been carried out which resulted in development of thermodynamic criteria for selection of an appropriate working fluid for subcritical and supercritical cycles. The postulated criteria are expressed in terms of non-dimensional numbers, which are characteristic for different fluids. The efficiency of the cycle is in a close relation to these numbers. The criteria are suitable for initial fluid selection. Such criteria should be used with other ones related to environmental impact, economy, system size, etc. Examples of such criteria have been also presented which may be helpful in rating of heat exchangers, which takes into account both heat transfer and flow resistance of the working fluid.

  • Critical analysis of laboratory measurements and monitoring system of water-pipe network corrosion-case study.
    • Agata Jażdżewska
    • Kazimierz Darowicki
    • Juliusz Orlikowski
    • Stefan Krakowiak
    • Krzysztof Żakowski
    • Maciej Gruszka
    • Jacek Banas
    2016 Full text Case Studies in Construction Materials

    Case study of corrosion failure of urban water supply system caused by environmental factors was presented. Nowadays corrosion monitoring of water distribution systems is an object of major concern. There is possibility of application broad range of techniques like gravimetric and electrochemical. Both kinds of techniques can be applied in laboratory and field conditions. In many cases researches limit the case analysis to measurements in laboratory conditions. Presented work contain critical analysis of results obtained in laboratory and field conditions based on corrosion monitoring of three pipelines systems failure in Krakow.

  • Cross-layer mDNS/ARP integration for IEEE 802.11s Wireless mesh Network
    • Krzysztof Gierłowski
    2016

    Popularization of mobile computing devices created a need for robust, efficient and ubiquitous methods of communication and network access. At the same time, evolution and standardization of Wireless Local Area Network (WLAN) technologies made them an attractive solution for building of complex network systems. Moreover, growing maturity of WLAN standards such as IEEE 802.11 allows for introduction of WLAN architectures other than a classic point-to-multipoint structure. An interesting example of such architectures is described in IEEE 802.11s mesh extension to the popular WiFi standards family. It is a very comprehensive proposition, likely to provide advantages in both infrastructure access and ad-hoc setups. However, due to distinctive characteristics of wireless mesh networks, many network services designed to function in classic, cable-based Local Area Networks will perform inefficiently in such an environment. The paper presents a proposition of a cross-layer procedure integrating Multicast DNS name discovery, ARP address resolution and IEEE 802.11s mesh path discovery, which offers significant advantages compared to a standard deployment of these services in IEEE 802.11s wireless mesh environment.

  • Cross-linked epoxy-isocyanate blends containing Epidian-6 modified by glycols
    • Michael Bratychak
    • Ostap Ivashkiv
    • Piotr Bruzdziak
    • Jacek Namiesnik
    • Olena Shyshchak
    • Piotr Bruździak
    2016 Full text Polimery

    Polymeric films of cross-linked structure may be formed using epoxy-isocyanate blends composed of Epidian-5 epoxy resin, 4,4’-diphenylmethanediisocyanate (MDI), Z-1 polyamine hardener and Epidian-6 epoxy resin modified by glycols. The effect of the component natures and ratio, process temperature and time on the gel-fraction content, as well as film hardness, was examined. The chemistry of the film forming process was determined using infrared-spectroscopy (IR).

  • Crucial factors for improving the ISO 14001 environmental management system
    • Joanna Ejdys
    • Alina Matusza-Flejszman
    • Michał Szymański
    • Leonas Ustinovichius
    • Galina Shevchenko
    • Agata Lulewicz-Sas
    2016 Full text Journal of Business Economics and Management

    The practice of using environmental management systems (EMS) ISO 14001 at the organisational level indicates that the efficacy of such solutions depends on many factors, both endogenous and exogenous in nature. This article aims to identify the fac- tors that determine the opportunities for the improvement of EMS in organisations, the analysis of the relationship between the factors and the classification of the factors due to their role in the system improvement. The structural analysis was used to classify and identify the key factors and then to categorize these factors into five groups. Finally, the role of these key factors in improving environmental management systems was exam- ined. Based on the findings, guidelines can be offered to both scholars and practitioners regarding the factors crucial for the improvement of the EMS. Aiming to add value to the existing literature, the structural analysis was adapted to classification and identification of the key factors. From the point of view of practitioners, it seems to be very profitable to concentrate on the crucial factors during the process of EMS improvement.

  • Crystal and electronic structures of Ni(II) silanethiolates containing flexible diamine ligands
    • Agnieszka Pladzyk
    • Andrzej Ożarowski
    • Łukasz Ponikiewski
    2016 INORGANICA CHIMICA ACTA

    Five nickel(II) complexes containing aliphatic diamines and tri-tert-butoxysilanethiolate ligand have been synthesized for the purpose of studying their structural, spectral (IR, UV–Vis, HF EPR) and thermal properties. Complexes (1)–(5) have been prepared in high yield by reactions of [Ni{SSi(OtBu)3}2(NH3)(H2O)] with 1.3-propanediamine (L1), 1,6-hexanediamine (L2), or 1,7-heptanediamine (L3). The X-ray structures were determined for complexes [Ni{(SSi(OtBu)3}2(μ-L1)2] (1), [Ni{(SSi(OtBu)3}2(μ-L2)2]n (2) and [Ni{(SSi(OtBu)3}2(μ-L3)4]n (3). Compound (1) is mononuclear with Ni(II) ions coordinated by two molecules of chelating 1.3-diaminepropane. Complexes (2) and (3) consist of 1D polymeric structures with Ni(II) atoms bridged by diamine molecules. The coordinated atoms and the nickel atom form a NiN2S2 square-planar core in polymeric (2) and a distorted trans-octahedral NiN4S2 core in mononuclear (1) and polynuclear (3). Reactions of [Ni{SSi(OtBu)3}2(NH3)(H2O)] with 1,4-butanediamine (L4) and 1,5-pentanediamine (L5) resulted in single crystals of compounds (4) and (5) which were not suitable for X-ray measurements. The spin Hamiltonian parameters g, D, and E were determined for compound (1) from high-field HF EPR spectra.

  • Crystal structure and physical properties of new Ca2TGe3 (T = Pd and Pt) germanides
    • Tomasz Klimczuk
    • Weiwei Xie
    • Michał Jerzy Winiarski
    • Robert Kozioł
    • Leszek Litzbarski
    • Huixia Luo
    • Robert J. Cava
    2016 JOURNAL OF SOLID STATE CHEMISTRY

    The crystallographic, electronic transport and thermal properties of Ca2PdGe3 and Ca2PtGe3 are reported. The compounds crystalize in an ordered variant of the AlB2 crystal structure, in space group P6/mmm, with the lattice parameters a = 8.4876(4) Å/8.4503(5) Å and c = 4.1911(3) Å/4.2302(3) Å for Ca2PdGe3 and Ca2PtGe3, respectively. The resistivity data exhibit metallic behavior with residual-resistivity-ratios (RRR) of 13 for Ca2PdGe3 and 6.5 for Ca2PtGe3. No superconducting transition is observed down to 0.4 K. Specific heat studies reveal similar values of the Debye temperatures and Sommerfeld coefficients: Θ_D = 298 K, γ = 4.1 mJ mol−1 K−2 and Θ_D = 305 K, γ = 3.2 mJ mol−1 K−2 for Ca2PdGe3 and Ca2PtGe3, respectively. The low value of γ is in agreement with the electronic structure calculations.

  • Crystallization of space: Space-time fractals from fractal arithmetic
    • Diederik Aerts
    • Marek Czachor
    • Maciej Kuna
    2016 Full text CHAOS SOLITONS & FRACTALS

    Fractals such as the Cantor set can be equipped with intrinsic arithmetic operations (addition, subtraction, multiplication, division) that map the fractal into itself. The arithmetics allows one to define calculus and algebra intrinsic to the fractal in question, and one can formulate classical and quantum physics within the fractal set. In particular, fractals in space-time can be generated by means of homogeneous spaces associated with appropriate Lie groups. The construction is illustrated by explicit examples.

  • CSR education in Poland- current situation and future challenges
    • Magdalena Popowska
    2016 Full text HORYZONTY WYCHOWANIA

    The importance of corporate social responsibility (CSR) in nowadays business reality is constantly growing thanks to many factors, including the important promotional effort at all possible authorities levels and increasing educational effort of universities and in particular of business schools. Since there is no commonly accepted guideline/curriculum/content of social responsibility (SR) education, business schools at higher education institutions (HEIs) start to develop their own approaches on SR education. This paper aims to present the general background of CSR education with particular emphasis on its enhancements existing in EU and other countries or continents. Its ambition is also to offer a picture of CSR related educational activities launched by Polish HEIs and to present its evaluation by students. The first goal will be accomplished with the literature study and the review of initiatives publicly disclosed by the authorities, NGOs and finally by HEIs themselves. The second ambition will be completed with the outcomes of the survey conducted by the author in Gdańsk University of Technology (GUT), Faculty of Management and Economics (FME). The conclusions of this work allow to propose recommendations to be implemented in the SR education in the future.

  • CSR in Polish SMEs- from perception to infatuation. Examples of socially engaged firms from Pomeranian Region
    • Magdalena Popowska
    2016 Full text Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie

    Despite the increasing worldwide awareness of the importance of social issues in con-temporary business management, Polish small and medium-sized enterprises seem to re-main in the group of followers, certainly not leaders, of the corporate social responsibility (CSR) movement, and this despite important dissemination efforts by numerous institu-tions. The aim of this paper is to present the bumpy road to the (still incomplete) implementa-tion of CSR by Polish SMEs and also to demonstrate a possible shift in the attitude of Polish entrepreneurs. The research is based on available statistical and qualitative data from recent reports and official policies. A presentation of cases of companies emerging from a regional CSR contest completes the picture.

  • Cultural Heritage in Spatial Planning
    • Krzysztof Rzasa
    • Marek Ogryzek
    • Marcin Kulawiak
    2016

    The cultural heritage objects of each country should have a major impact on the development of space. Unfortunately, most often the investment needs prevail and only the most precious historical objects are protected. Thus often a monument is preserved, but its surroundings (which put it in context) are lost forever. This article addressed the issues of cultural heritage in relation to the spatial planning system in Poland. The legal bases for the protection of monuments and their compounds are discussed along with statutory requirements for space planning. On selected examples located in Warmia and Mazury (voivodship located in is the north-eastern part of Poland), an analysis of the planning records connected with the protection of cultural heritage is also presented. The authors refer to the effectiveness of these records and their actual executive power, as well as indicate the needed legal changes leading to historical objects having a real impact on the change in land use planning.

  • Current based Normalized Triple Covariance as a bearings diagnostic feature in induction motor
    • Leon Swędrowski
    • Tomasz Ciszewski
    • Len Gelman
    2016 NDTnet

    Diagnosis of induction motors, conducted remotely by measuring and analyzing the supply current is attractive with the lack of access to the engine. So far there is no solution, based on analysis of current, the credibility of which allow use in industry. Statistics of IM bearing failures of induction motors indicate, that they constitute more than 40% of IM damage, therefore bearing diagnosis is so important. The article provides an overview of selected methods of diagnosis of induction motor bearings, based on measurement of the supply current. The problem here is the high disturbance components level of the motor current in relation to diagnostic components. The paper presents the new approach to signal analysis solutions, based on statistical methods, which have been adapted to be used by this diagnostic system. First experimental results with use of this method are also presented, they confirm the advantages of this method.

  • Current risk analysis and management issues in technical systems.
    • Kazimierz Kosmowski
    2016 Full text Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

    Dealing with the reliability and safety of industrial hazardous plants requires taking into account relevant interdisciplinary scientific knowledge and some existing approaches based on so-called good engineering practice, also those included in the international standards and guidelines. In this article an approach is proposed how to integrate the functional safety concept with information security aspects in the design and management of the industrial automation and control systems during operation of an industrial hazardous plant.

  • Current situation in Polish nuclear medicine and Polish example of model Nuclear Medicine Centre meeting European Union requirements
    • Jan Jakub Lica
    • Grzegorz Jan Grabe
    • Tomasz Bandurski
    2016 European Journal of Oncology

    Nuclear medicine is currently a well-established part of medicine. It is applied in many fields of clinical medicine and science like endocrinology, oncology, cardiology, molecular medicine and engineering, radiopharmacy, physics and information science. Due to its increasing importance and application, several regulation and supervision bodies have been founded to ensure safe usage of radiation and to improve diagnostic and therapeutic procedures. This article reviews the legal requirements of Polish law regarding a fully functional Nuclear Medicine Centre (NMC) and reports on the current situation of nuclear medicine in Poland. It also suggests a model project for NMCs compatible with Polish and European Union regulations.

  • Current-based higher-order spectral covariance as a bearing diagnostic feature for induction motors
    • Tomasz Ciszewski
    • Len Gelman
    • Leon Swędrowski
    2016 INSIGHT

    Conducting the diagnosis of induction motors remotely by analyzing the supply current is an attractive prospect with the lack of access to the engine. Currently, there is no solution, based on analysis of the current, the credibility of which would allow its use in industry. The statistics of bearing failures in induction motors indicate that they constitute more than 40% of induction motor damage, therefore, bearing diagnosis is extremely important. This paper provides an overview of methods of diagnosis of induction motor bearings, based on measurement of the supply current. A problem is coused by the high level of disturbance components in the motor current in relation to the diagnostic components. The paper presents a new approach to signal analysis solutions, based on the novel higher-order spectral covariance, which have been adapted for this diagnostic system. The first experimental results with use of this method are also presented and they confirm the advantages of the method.