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Publications Repository
Gdańsk University of Technology

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Publications from the year 2016

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  • Local Structure and Stability of SEI in Graphite and ZFO Electrodes Probed by As K-edge Absorption Spectroscopy
    • Rezvani Javad Seyed
    • Matteo Ciambezi
    • Roberto Gunnella
    • Marco Minicucci
    • Miguel Munoz-Marquez
    • Francesco Nobili
    • Marta Pasqualini
    • Stefano Passerini
    • Christian Schreiner
    • Angela Trapananti
    • Agnieszka Witkowska
    • Andrea DiCicco
    2016 Journal of Physical Chemistry C

    The evolution of the solid electrolyte interphase (SEI) during the first Li uptake in advanced Li-ion electrodes is studied by X-ray absorption spectroscopy (XAS). The As atoms present in the electrolyte solution were used as a local probe for monitoring the SEI growth on different electrodes. High-quality As K-edge spectra were collected in fluorescence mode for a set of graphite and carbon-coated ZnFe2O4 electrodes. XAS measurements have been preceded and corroborated by electrochemical characterizations. SEI phase evolution was analyzed by distinct As valence states in the subsequent stages of SEI formation, while X-ray fluorescence (XRF) was used to estimate the As content. Detailed structural results are presented for different Li contents in different electrodes including the estimated thickness of the SEI layer, contribution of different As oxidation states, and As local structure. The formation of AsFN complexes with different local coordination N is clearly observed and measured at various SEI evolution stages. Evidence of a partially reversed redox process, taking place within the SEI by charge − discharge cycling, was also obtained.

  • LOGISTYCZNE UWARUNKOWANIA TRANSPORTU ŁADUNKÓW PONADNORMATYWNYCH – STUDIUM PRZYPADKU TRANSPORTU ŁADUNKU NA TRASIE ELBLĄG – GDAŃSK
    • Patrycja Jerzyło
    • Sylwia Kozłowska
    2016 Full text PRACE NAUKOWE POLITECHNIKI WARSZAWSKIEJ. SERIA: TRANSPORT

    W artykule przedstawiono analizę wielokryterialną wariantów przewozu ładunków z wykorzystaniem transportu drogowego, śródlądowego i śródlądowo- morskiego. Omówiono wymogi prawne dotyczące przewozu towarów ponadnormatywnych. Na potrzeby analizy zdefiniowano kryteria wyboru środka transportowego i trasy przejazdu

  • Logistyka składowania odpadów w procesie produkcyjnym statków typu offshore
    • Radosław Drozd
    2016

    W niniejszym artykule autor przedstawił najistotniejsze problemy dotyczące logistyki odpadów, z którymi na co dzień boryka się jedna z polskich stoczni, podczas produkcji statków typu offshore - wraz z możliwymi rozwiązaniami

  • Logistyka transportu drogowego w świetle racjonalizacji kosztów przedsiębiorstw produkcyjnych.
    • Radosław Drozd
    • Marcin Kisielewski
    2016 Full text Transport Economics and Logistics

    W artykule przedstawiono aktualne kierunki, w których zmierzają przedsiębiorstwa produkcyjne, dysponujące własnym transportem, dążąc do redukcji wydatków związanych z operacjami logistycznymi, głównie przez zmiany sposobu realizacji zadañ transportowych oraz otwartość na nowe koncepcje zarządzania procesami logistycznymi. W pracy poruszono istotne problemy związane z nieoptymalnym wykorzystywaniem zasobów transportowych w przedsiębiorstwach produkcyjnych oraz przedstawiono rozwiązania, które mogą wpłynąć na racjonalizację kosztów.

  • LOKALNE PROBLEMY POWODZI ROZTOPOWYCH NA PRZYKŁADZIE ZLEWNI RZEKI BOLSZEWKI
    • Ewelina Wójcik
    • Wojciech Szpakowski
    2016 Gospodarka Wodna

    Opracowywane w ramach wdrażania Dyrektywy Powodziowej mapy zagrożenia powodziowego nie obejmują, co wynika z przyjętej metodyki ich przygotowania, wszystkich obszarów narażonych na występowanie powodzi. W artykule omówiono jeden z takich przypadków odnoszący się do powodzi roztopowej o lokalnym zasiegu. Wykorzystując materiały archiwalne Autorzy omówili przebiegi skutki tego zjawiska , wskazując na naturalne i antropogeniczne przyczyny jego wystąpienia na przykładzie zlewni Bolszewki

  • Lokalny Program Rewitalizacji Miasta Wejherowa
    • Piotr Lorens
    • Sławomir Ledwoń
    2016

    Praca dotyczy planowania rewitalizacji miasta Wejherowa w oparciu o wytyczne Ministerstwa Infrastruktury i Rozwoju. Na jej strukturę składają sie zarówno delimitacja obszarów zdegradowanych i rewitalziajci jak i zapisy samego Programu Rewitalizacji

  • Lossless Compression of Binary Trees with Correlated Vertex Names
    • Abram Manager
    • Krzysztof Turowski
    • Wojciech Szpankowski
    2016

    Compression schemes for advanced data structures have become the challenge of today. Information theory has traditionally dealt with conventional data such as text, image, or video. In contrast, most data available today is multitype and context-dependent. To meet this challenge, we have recently initiated a systematic study of advanced data structures such as unlabeled graphs [1]. In this paper, we continue this program by considering trees with statistically correlated vertex names. Trees come in many forms, but here we deal with binary plane trees (where order of subtrees matters) and their non-plane version. Furthermore, we assume that each symbol of a vertex name depends in a Markovian sense on the corresponding symbol of the parent vertex name. We first evaluate the entropy for both types of trees. Then we propose two compression schemes COMPRESSPTREE for plane trees with correlated names, and COMPRESSNPTREE for non-plane trees. We prove that the former scheme achieves the lower bound within two bits, while the latter is within 1% of the optimal compression.

  • Loudness Scaling Test Based on Categorical Perception
    • Bożena Kostek
    • Piotr Odya
    • Piotr Suchomski
    2016 Full text Archives of Acoustics

    The main goal of this research study is focused on creating a method for loudness scaling based on categorical perception. Its main features, such as: way of testing, calibration procedure for securing reliable results, employing natural test stimuli, etc., are described in the paper and assessed against a procedure that uses 1/2-octave bands of noise (LGOB) for the loudness growth estimation. The Mann-Whitney U-test is employed to check whether the proposed method is statistically equivalent to LGOB. It is shown that loudness functions obtained in both methods are similar in the statistical context. Moreover, the band-filtered musical instrument signals are experienced as more pleasant than the narrow-band noise stimuli and the proposed test is performed in a shorter time. The method proposed may be incorporated into fitting hearing strategies or used for checking individual loudness growth functions and adapting them to the comfort level settings while listening to music.

  • Low cost electrochemical sensor module for measurement of gas concentration
    • Grzegorz Jasiński
    • Anna Strzelczyk
    • Piotr Adam Kościński
    2016 Full text IOP Conference Series: Materials Science and Engineering

    This paper describes a low cost electrochemical sensor module for gas concentration measurement. A module is universal and can be used for many types of electrochemical gas sensors. Device is based on AVR ATmega8 microcontroller. As signal processing circuit a specialized integrated circuit LMP9l000 is used. The proposed equipment will be used as a component of electronic nose system employed for classifying and distinguishing different levels of air contamination.

  • Low harmonic multipulse voltage converters using coupled reactors
    • Ryszard Strzelecki
    • Tomasz Sak
    • Maciej Grabarek
    • Pavel Zolov
    • Natalia Strzelecka
    2016

    This paper presents a novel approach to the multi pulse voltage converters (VC), especially voltage source inverters (VSI) and matrix converters (MC) based on several typical identical modules connected in parallel using coupled reactors. Such arrangements resulting in lower voltage distortions at extremely low switching frequency. The proposed arrangement was validated by simulation. Laboratory models of 18- and 24pulse 3-level VSI arrangements were also investigated experimentally. Results of simulation and laboratory tests of experimental models are presented in the paper

  • Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C
    • Sebastian Molin
    • Piotr Jasiński
    • Lars Mikkelsen
    • W. Zhang
    • Ming Chen
    • Peter Vang Hendriksen
    2016 JOURNAL OF POWER SOURCES

    In this study two materials, MnCo2O4 and MnCo1.8Fe0.2O4 are studied as potential protective coatings for Solid Oxide Fuel Cell interconnects working at 750 °C. First powder fabrication by a modified Pechini method is described followed by a description of the coating procedure. The protective action of the coating applied on Crofer 22 APU is evaluated by following the area specific resistance (ASR) of the scale/coating for 5500 h including several thermal cycles. The coating is prepared by brush painting and has a porous structure after deposition. Post mortem microstructural characterization performed on the coated samples shows good protection against chromium diffusion from the chromia scale ensured by a formation of a dense reaction layer. This study shows, that even without high temperature sintering and/or reactive sintering it is possible to fabricate protective coatings based on MnCo spinels.

  • Low-Cost Data-Driven Surrogate Modeling of Antenna Structures by Constrained Sampling
    • Sławomir Kozieł
    2016 IEEE Antennas and Wireless Propagation Letters

    Full-wave electromagnetic (EM) analysis has become one of the major design tools for contemporary antenna structures. Although reliable, it is computationally expensive which makes automated simulation-driven antenna design (e.g., parametric optimization) difficult. This difficulty can be alleviated by utilization of fast and accurate replacement models (surrogates). Unfortunately, conventional data-driven modeling of antennas is usually prohibitively expensive in terms of data acquisition or even infeasible (due to numerical problems with handling large training data sets). In this letter, a technique for reduced-cost antenna modeling is discussed. It exploits constrained sampling within a restricted region of the design space, defined by the reference designs optimized for selected sets of performance requirements. The proposed approach permits dramatic reduction of the sampled portion of the design space without formally reducing geometry parameter ranges. It is demonstrated using two antenna structures and favorably compared to conventional modeling using kriging interpolation.

  • Low-cost multi-objective design of compact microwave structures using domain patching
    • Adrian Bekasiewicz
    • Sławomir Kozieł
    • John W. Bandler
    2016

    A good compromise between size and electrical performance is an important design consideration for compact microwave structures. Comprehensive information about size/performance trade-offs can be obtained through multi-objective optimization. Due to considerable electromagnetic (EM) cross-couplings in highly compressed layouts, the design process has to be conducted at the level of high-fidelity EM analysis which is computationally prohibitive when using conventional methods (e.g., population-based metaheuristics). Here, we perform multi-objective design of compact structures using a domain patching algorithm. It is a low-cost and deterministic procedure for constructing the path connecting the extreme Pareto-optimal designs (obtained through auxiliary single-objective optimization runs), executed at the level of coarse-discretization EM simulations. The final representation of the Pareto front is then generated from response correction techniques. Our approach is illustrated through a compact impedance matching transformer.

  • Low-cost multi-objective optimization and experimental validation of UWB MIMO antenna
    • Sławomir Kozieł
    • Adrian Bekasiewicz
    2016 ENGINEERING COMPUTATIONS

    Purpose–The purpose of this paper is to validate methodologies for expedited multi-objective designoptimization of complex antenna structures both numerically and experimentally.Design/methodology/approach–The task of identifying the best possible trade-offs between theantenna size and its electrical performance is formulated as multi-objective optimization problem.Algorithmic frameworks are described for finding Pareto-optimal designs using auxiliary surrogatemodels and two alternative approaches to design refinement: response correction techniques andco-kriging. Numerical and experimental case studies are provided to demonstrate feasibility of solvingreal-world and complex antenna design tasks.Findings–It is possible, through appropriate combination of the surrogate modeling techniques (bothdata driven and physics based) and response correction methods, to find the set of alternative designsrepresenting the best possible trade-offs between conflicting design objectives, here, electricalperformance and size. Design optimization can be performed at practically feasible computational costs.Research limitations/implications–The study demonstrates feasibility of automated multi-objectivedesign optimization of antennas at low computational cost. The presented techniques reach beyond thecommonly used design approaches based on parameter sweeps and similar hands-on methods, particularlyin terms of automation, reliability and reduction of the computational costs of the design processes.Originality/value–Multi-objective design of antenna structures is very challenging when high-fidelity electromagnetic simulations are utilized for performance evaluation of the structure at hand.The proposed design framework permits rapid optimization of complex structures (here, MIMOantenna), which is hardly possible using conventional methods.

  • Low-cost multi-objective optimization of antennas using Pareto front exploration and response features
    • Sławomir Kozieł
    • Adrian Bekasiewicz
    2016

    In the paper, a procedure for low-cost multi-objective optimization of antenna structures is presented. Our approach is based on exploration of the Pareto front representing the best possible trade-offs between conflicting objectives, here, the structure size and its electrical performance. Starting from the design representing the best in-band reflection level, subsequent Pareto-optimal designs are identified through local constrained optimization aimed at reducing the structure size while maintaining the prescribed thresholds concerning the reflection response. For the sake of computational efficiency, variable-fidelity EM simulation models and feature-based optimization algorithm is utilized. The proposed methodology is demonstrated using a compact UWB monopole antenna.

  • Low-Cost Surrogate Models for Microwave Filters
    • Natalia Leszczynska
    • Ivo Couckuyt
    • Tom Dhaene
    • Michał Mrozowski
    2016 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS

    A novel low-cost kriging-based multivariable parametric macromodeling technique for microwave filters is presented. Kriging is used to model both the residues and poles of a microwave filter's reflection coefficient, and the zeros of the transmission coefficient. The proposed residue-pole-zero (RPZ) technique is demonstrated to efficiently model a high dimensional (8D) microwave filter with pseudoelliptic characteristics.

  • Low-power device simulator for micro-energy measurement methods testing
    • Dariusz Palmowski
    • Grzegorz Lentka
    • Arkadiusz Hojka
    2016 Full text Przegląd Elektrotechniczny

    The paper presents low-power device simulator designed for testing of micro-energy measurement methods. Such kind methods can be used for evaluation of power systems based on Energy Harvesting. The device allows to set the current consumption characteristic over the time, thus making possible playing the role of different types of low-power devices e.g. simulating sensor network node.

  • LTE as a Trunking - Dispatch System
    • Sławomir Gajewski
    • Małgorzata Gajewska
    • Ryszard Katulski
    2016 Full text Zeszyty Naukowe Akademii Marynarki Wojennej

    In the paper solutions of trunking-dispatch systems based on the LTE system are presented. The solution in the form of separate LTE/TDD trunking system is discussed, and the concept of the LTE/FDD trunking system operating in the infrastructure of public, mobile networks is characterised.

  • Luminescent properties of Ln3+ doped tellurite glasses containing AlF3
    • Michalina Walas
    • Agata Pastwa
    • Tomasz Lewandowski
    • Anna Synak
    • Ignacy Gryczyński
    • Wojciech Sadowski
    • Barbara Kościelska
    2016 OPTICAL MATERIALS

    The low-phonon energy tellurite glasses TeO2-BaO-Bi2O3 and TeO2-BaO-Bi2O3-AlF3 triply doped with Eu3+, Tb3+, Tm3+ ions in two different molar ratios were synthesized using melt-quenching technique. Their structure and luminescence properties were widely investigated by X-ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR) and Photoluminescence Spectroscopy (PL). The luminescence spectra of Eu3+, Tb3+, Tm3+ co-doped glasses show apart of the bands corresponding to the 4f-4f transitions of lanthanide ions also band corresponding to glass matrix. AlF3 doping increases emission intensity, although to improve overall emission color further studies on molar composition of samples and the molar ratio of the components should be carried out.

  • Łuk Białostocki
    • Mirosław Wałęga
    • Mariusz Sobczyk
    • Zbigniew Szuchnicki
    • Mikołaj Miśkiewicz
    • Jacek Chróścielewski
    2016 Materiały Budowlane

    Artykuł prezentuje oddany do użytkowania w czerwcu 2011 wiadukt drogowy ,,Łuk Białostocki”. Konstrukcja ta z uwagi na lokalizację dźwigara łukowego względem osi pomostu – po przekątnej, jest w Polsce w swojej skali obiektem prototypowym. Ustrój nośny obiektu stanowi stalowy bezprzegubowy dźwigar łukowy, usytuowany w rzucie z góry po krótszej przekątnej konstrukcji, z podwieszonym za pomocą cięgien pomostem zespolonym. Rozpiętość obiektu wynosi 66 m, zaś szerokość całkowita 16,48 m. Asymetryczny układ lin zmieniający stronę podwieszenia w kluczu poza dominującą siłą ściskającą jest poddany znacznemu zginaniu ukośnemu ze skręcaniem co zmienia klasyczną strukturę wytężenia dźwigara pracującego w strukturalnie złożonym stanie naprężeń wraz z tendencją do wymuszania poziomej rotacji pomostu. Projektant BPBK S.A. w celach konsultacyjnych posiłkował się nadzorem naukowym realizowanym przez zespół mostowy z Politechniki Gdańskiej. Niezależnie od obliczeń wykonanych przez projektantów nadzór naukowy analizował pracę całej konstrukcji i jej fragmentów. Dodatkowe symulacje obliczeniowe wspierały jednostkę projektową w podejmowaniu decyzji podczas rozwiązywania detali konstrukcyjnych, wytwarzania i wznoszenia obiektu.