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Gdańsk University of Technology

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  • Optical investigations of electrochemical processes using a long-period fiber grating functionalized by indium tin oxide
    • Marta Janczuk-Richter
    • Monika Piestrzyńska
    • Dariusz Burnat
    • Petr Sezemsky
    • Vitezslav Stranak
    • Wojtek J. Bock
    • Robert Bogdanowicz
    • Joanna Niedziółka-Jönsson
    • Mateusz Śmietana
    2019 SENSORS AND ACTUATORS B-CHEMICAL

    he growing needs for fast and reliable sensing devices stimulate development of new technological solutions. In this work a new multi-domain sensing method is demonstrated where optical sensing device has been applied to enhance amount of data received during electrochemical analysis. Thin, optically transparent, high-refractive-index, and electrically conductive indium tin oxide (ITO) film was deposited using magnetron sputtering on the surface of the long-period gratings (LPG) induced in optical fiber. ITO serves as working electrode in electrochemical setup and as a coating that enhances sensitivity of a LPG to changes of external refractive index. All the measurements were conducted in a combined optical and electrochemical setup. Obtained results show capability of this approach for optical monitoring of both electrochemical processes and changes in optical properties at the ITO surface. The optical response of the sensor was strongly dependent on the voltage applied to the ITO-LPG working electrode and on composition of the electrolyte. Changes observed in optical spectra may be attributed to the alterations in optical properties of both ITO layer (refractive index changes) and electrolyte in the vicinity of electrode (double layer formation). The developed structures can be further used as a fiber-based sensors and biosensors with integrated opto-electrochemical readout.

  • Optical Magnetometry Based on Nanodiamonds with Nitrogen-Vacancy Color Centers
    • Adam M. Wojciechowski
    • Paulina Nakonieczna
    • Mariusz Mrózek
    • Krystian Sycz
    • Andrzej Kruk
    • Mateusz Ficek
    • Maciej Jerzy Głowacki
    • Robert Bogdanowicz
    • Wojciech Gawlik
    2019 Full text Materials

    Nitrogen-vacancy color centers in diamond are a very promising medium for many sensing applications such as magnetometry and thermometry. In this work, we study nanodiamonds deposited from a suspension onto glass substrates. Fluorescence and optically detected magnetic resonance spectra recorded with the dried-out nanodiamond ensembles are presented and a suitable scheme for tracking the magnetic-field value using a continuous poly-crystalline spectrum is introduced. Lastly, we demonstrate a remote-sensing capability of the high-numerical-aperture imaging fiber bundle with nanodiamonds deposited on its end facet.

  • Optical properties of daylight curable resin doped with nanodiamond powder
    • Krzysztof Królewski
    • Aleksandra Wieloszyńska
    • Aleksandra MARIA Kamińska
    • Katarzyna Kardacz
    2019 Full text Photonics Letters of Poland

    In this paper a new material for 3D printing was elaborated on. Since diamond has very good optical properties, an idea occurred to us to apply it in 3D printing process. A mixture of nanodiamond powder and a standard 3D printing resin was created and several printouts have been completed. They have been tested for their abilities to transmit and absorb light in a wide spectrum of wavelengths. It turned out that the nanopowder doped resin in comparison to standard one has worst optical properties. However, it shows that mixture of resin and nanopowder can control optical properties of printouts.

  • Optimal ECG lead for deriving respiratory signal
    • Piotr Przystup
    • Artur Poliński
    • Adam Bujnowski
    • Tomasz Kocejko
    • Jerzy Wtorek
    2019

    EDR is an interesting measuring technique that allows an indirect assessment of respiratory activity. This is an alternative solution to direct methods that are based on the measurement of air flow, which require a specialized sensor or even a system. However, due to inter-personal anatomical differences, the optimal ECG lead (placement of the electrodes) ensuring the best EDR signal quality is not fixed. An influence of ECG lead geometrical relation to the heart axis on the EDR signal quality has been examined in the paper. It was found that optimal electrodes position strongly differs between individuals. For each person there were at least few leads with high correlation with reference signal (over 0.8). They allowed for respiration frequency estimation with almost 100% accuracy

  • Optimization of combined heat and power (CHP) market allocation: The case of Poland
    • Paweł Bućko
    • Marcin Jaskólski
    • Alicja Stoltmann
    2019 Full text IOP Conference Series: Earth and Environmental Science

    Combined heat and power (CHP), that is production of electricity and useful heat in a single thermodynamic process, is a way of primary energy saving and emission reduction. Therefore, promotion of the electricity from high-efficiency cogeneration (CHP-E) was encouraged in the European Union. However, CHP-E promotion mechanisms proved low effectiveness in certain countries, like Poland, where the prices of certificates of origin were kept at relatively low levels. This paper attempts to analyse the effect of CHP-E support system on the market allocation of different cogeneration technologies. MARKAL model of Polish power system was applied to calculate the installed capacity and annual electricity production from cogeneration plants in time perspective to 2030. The impact of buy-out fee and resulting shadow prices of certificates on the market share of CHP-E and the technology choice was studied. The convergence of promotion mechanisms for CHP-E and electricity from renewable energy sources (RES-E) was also investigated.

  • Optimization of Energetic Train Cooperation
    • Michał Urbaniak
    • Ewa Kardas-Cinal
    • Marianna Jacyna
    2019 Full text Symmetry-Basel

    In the article, possible ways of using energy recovered during regenerative braking of trains are presented. It is pointed out that the return of recovered electricity directly to the catenary and its use in the energy cooperation of vehicles can be a no-cost method (without additional infrastructure). The method of energy cooperation between trains and its main assumptions, that uses the law of conservation of energy, are described in detail. An original model is proposed which assumes optimization by controlling the train arrival time at the station within the technical time reserve. Optimization method was used metaheuristic and adapted swarm algorithm called the firefly algorithm. An exemplary simulation of the energy cooperation of trains for selected stops of a double-track railway line of the Tricity Rapid Urban Railway has been done and the obtained results are presented. Finally, in discussion and conclusions, the results were summarized and the significance of the development of the discussed method for transport rationalization was presented.

  • Optimization of the spindle speed during milling of large-sized structures with the use of technique of Experiment-Aided Virtual Prototyping
    • Krzysztof Kaliński
    • Marek Galewski
    • Michał Mazur
    • Natalia Morawska
    2019

    In the paper are presented considerations concerning vibration suppression problems during milling of large-sized workpieces with the use of innovative method of matching the spindle speed of cutting tool. It depends on repeatable change of the spindle speed value as soon as the optimal vibration state of the workpiece approaches. The values of dominant “peaks” in the frequency spectra and the Root Mean Square (RMS) values of time domain displacements are evaluated. The efficiency of the proposed approach is evidenced by chosen mechatronic design technique, called Experiment-Aided Virtual Prototyping (E-AVP). Thanks to the results of the identification of the modal subsystem obtained by the Experimental Modal Analysis (EMA) method, it can be stated that the parameters obtained from the experiment and delivered from the computational model have been correctly determined and constitute reliable process data for the simulation tests.

  • Optimization of using recuperative braking energy on a double-track railway line
    • Michał Urbaniak
    • Ewa Kardas-Cinal
    2019 Full text Transportation Research Procedia

    In the introduction, possible ways of reusing energy from recuperation are presented. Next, the paper investigates the possibility of using regenerative braking in the range allowed by the detailed timetable by adopting the method of transferring the recovered electric energy directly to the catenary and immediate use of this energy by another train at the same power section. In the main part of the work, it is shown, that the use of energy recovered from regenerative braking can be optimized by controlling the arrival time of the train to the station within the range allowed by the detailed timetable. The possibilities of using the adopted method are shown on the example of "Tricity" (metropolis of Gdansk, Sopot, Gdynia) suburban railway line no. 250. Finally, selected optimization results are presented and a simplified analysis of the financial benefits resulting from the use and optimization of regenerative braking is presented.

  • Optimum shape of turnout diverging track with segments of variable curvature
    • Władysław Koc
    2019 JOURNAL OF TRANSPORTATION ENGINEERING-ASCE

    In the paper an attempt has been made to focus on shaping the variable curvature in the diverging track of the railway turnout. Basing on some earlier studies, solutions provided with a circular arc in the mid-zone, and in the extreme regions with segments of non-linear curvature of equal length and zero curvature at the start and end of the turnout, have been assumed as models. The most advantageous type of curvature has been chosen taking into account the kinematic conditions. The presentation made includes an analytical record of the curvature and the tangent inclination angle in the diverging track length and the Cartesian coordinates of the track. The final part of the paper referred to the determination of a set of basic values relating to geometric parameters appropriate for a given speed of trains and adequate for ensuring the minimization of the length of the entire turnout at a given final ordinate.

  • Optymalizacja parametrów obciążenia generatora magnetokumulacyjnego
    • Mirosław Wołoszyn
    • Daniel Kowalak
    • Kazimierz Jakubiuk
    • Mikołaj Nowak
    2019 Full text Poznan University of Technology Academic Journals. Electrical Engineering

    W pracy przedstawiono wyniki symulacji komputerowej generatora magnetokumulacyjnego (GM) obciążonego cewką indukcyjną. Badania symulacyjne przeprowadzono w celu optymalizacji parametrów cewki obciążenia generatora dla wybranej konstrukcji modelu GM. Badano wpływ indukcyjność i rezystancji obciążenia na współczynnik wzmocnienia prądu w układzie oraz na energię pola magnetycznego zgromadzoną w obciążeniu.

  • Optymalizacja podczyszczania odcieków i ścieków
    • Sylwia Fudala-Książek
    • Aneta Łuczkiewicz
    • Przemysław Kowal
    • Małgorzata Szopińska
    • Karol Mazurkiewicz
    2019 Przegląd Komunalny

    Istnieje kilka metod dedykowanych podczyszczaniu odcieków składowiskowych i ścieków technologicznych. Jakie są wady i zalety niektórych z nich? Które mogą oznaczać większy wydatek dla przedsiębiorstw, a które mogą przynieść im korzyści?

  • Optymalizacja prędkości obrotowej narzędzia podczas wytaczania przedmiotów wielkogabarytowych
    • Krzysztof Kaliński
    • Marek Galewski
    • Michał Mazur
    • Natalia Morawska
    2019

    Przedstawiono nową metodę wyznaczania optymalnej prędkości obrotowej narzędzia podczas wytaczania przedmiotów wielkogabarytowych, na podstawie symulacji procesu obróbki. Przeprowadzane są one dla modelu obliczeniowego wirującego narzędzia, dostrojonego do wyników testów modalnych, wraz z przyjętym modelem procesu skrawania. Ocenie podlegają wartości skuteczne (RMS) poziomu drgań w dziedzinie czasu oraz wartości dominujących amplitud w widmie, uzyskane w wyniku symulacji procesu wytaczania. Skuteczność metody potwierdzono na podstawie wyników badań eksperymentalnych, obejmujących lokalny pomiar wartości parametrów chropowatości Ra i Rz powierzchni otworu w najniżej położonym miejscu przedmiotu.

  • Optymalizacja treningu i wnioskowania sieci neuronowych
    • Marek Blok
    • Mariusz Pietrołaj
    2019 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

    Sieci neuronowe są jedną z najpopularniejszych i najszybciej rozwijających się dziedzin sztucznej inteligencji. Ich praktyczne wykorzystanie umożliwiło szersze użycie komputerów w wielu obszarach komunikacji, przemysłu i transportu. Dowody tego są widoczne w elektronice użytkowej, medycynie, a nawet w zastosowaniach militarnych. Wykorzystanie sztucznej inteligencji w wielu przypadkach wymaga jednak znacznej mocy obliczeniowej, co stanowi problem zarówno przy opracowywaniu, jak i testowaniu nowo wdrażanych rozwiązań. Jednym z coraz szerzej badanych aspektów tego problemu jest ograniczenie dokładności obliczeń wykonywanych w ramach treningu oraz wnioskowania sieci neuronowych.

  • Optymalizujące, krzepko dopuszczalne sterowanie systemami sieciowymi z zastosowaniem do systemów wodociągowych
    • Arkadiusz Cimiński
    2019 Full text

    Celem rozprawy doktorskiej było rozwiązanie problemu naukowego zdefiniowanego jako krzepko dopuszczalne sterowanie hydrauliką systemu wodociągowego. Wielkościami sterującymi były prędkości obrotowe pomp a wielkościami sterowanymi napory hydrauliczne w wybranych węzłach systemu. Do rozwiązania problemu sterowania tym systemem, wykorzystano technikę sterowania predykcyjnego oraz algorytmy genetyczne i krzepką predykcje wyjść systemu wodociągowego. W rozprawie doktorskiej przedstawiono charakterystykę systemu wodociągowego ze szczególnym uwzględnieniem zachowania się procesów hydraulicznych (napory i przepływy) oraz wpływu niepewności modelu i pomiarów na sterowanie tymi wielkościami. W rozprawie zaprezentowano różne podejścia do sterowania systemem wodociągowym, różniące się uwzględnieniem albo nieuwzględnieniem niepewności występujących w systemie. Do rozwiązania problemu sterowania dla tych dwóch podejść, wykorzystano algorytm genetyczny oraz symulator systemu wodociągowego (podejście bez niepewności) lub krzepką predykcje wyjść (podejście z niepewnością). W rozprawie opracowano m.in. nowe operatory genetyczne, algorytm efektywnej generacji trajektorii granicznych wyjść systemu czy algorytm generacji krzepko dopuszczalnego sterowania. Proponowane w rozprawie algorytmy były testowane na modelu rzeczywistego systemu wodociągowego miasta Chojnice.

  • Ordered TiO2 nanotubes with improved photoactivity through self-organizing anodization with the addition of an ionic liquid: effects of the preparation conditions
    • Anna Pancielejko
    • Paweł Mazierski
    • Wojciech Lisowski
    • Adriana Zaleska-Medynska
    • Justyna Łuczak
    2019 ACS Sustainable Chemistry & Engineering

    Modifying the geometric and surface parameters of oriented TiO2 nanotubes (NTs) is beneficial to the utilization of solar energy for chemical reactions, and this performance may be further improved. Thus, the effects of adding an ionic liquid (IL), 1-butylpiridinium chloride [BPy][Cl], and the effects of the water content and preparation conditions on the surface morphological, physicochemical, photocatalytic and photoelectrochemical properties of TiO2 NTs were thoroughly examined and presented. The anodic oxidation of Ti foil in an organic electrolyte containing a small amount of [BPy][Cl] allowed for obtaining IL_NTs with a well-ordered structure, even at low voltages (10 V). Additionally, the application of [BPy][Cl] enabled one of the geometric parameters of the IL_NTs, namely, the diameter, to be tuned, while the length remained the same (i.e., control over diameter was first noted). Improvements in the photocatalytic and photoelectrochemical activities of the IL_NTs in comparison with those of the pristine sample were observed (approximately 2.5 times higher due to the better utilization of incident photons). It is evident that the most significant parameter to influence the photoactivity was the electrolyte composition, especially the water and IL contents (15 vol.% and 0.01 wt.%, respectively). Consequently, the interaction between [BPy][Cl] and the TiO2 NT surface was demonstrated by X-ray Photoelectron Spectroscopy XPS results.

  • Organic Acids and Polyphenols Determination in Polish Wines by Ultrasound-Assisted Solvent Extraction of Porous Membrane-Packed Liquid Samples
    • Alicia Robles
    • Magdalena Fabjanowicz
    • Justyna Płotka-Wasylka
    • Piotr Konieczka
    2019 Full text MOLECULES

    In the near future, Poland is going to have more and more favorable conditions for viticulture. Organic acids and polyphenols are among the most commonly analyzed compounds due to their beneficial properties for human health and their importance in the winemaking process. In this work, a new technique involving ultrasound-assisted solvent extraction of porous membrane-packed liquid samples (UASE-PMLS) was for the first time described and applied for real samples. The methodology based on UASE-PMLS for organic acids and polyphenols in wine samples was optimized and validated. Using the new technique coupled to GC–MS, organic acids and polyphenols were evaluated in Polish wine samples. Extraction solvent, extraction temperature, derivatization time and sample pH were optimized. Chemometric tools were used for data treatment. Good linearity was obtained for the concentration ranges evaluated with r values between 0.9852 and 0.9993. All parameters of method validation (intra- and inter-day precision and matrix effect) were over 80% with coefficient of variation (CV) up to 17%. Recovery was between (92.0 ± 8.5)% and (113 ± 16)%. Finally, green assessment was evaluated using Analytical Eco-Scale and Green Analytical Procedure Index (GAPI). The UASE-PMLS is characterized by many advantages, e.g., the extraction process is fast and easy coupled to GC–MS. Regarding other extraction techniques, the amount of used solvent is minimum, and no waste is generated. Therefore, it is an environmentally friendly technique.

  • Organic carbon fluxes of a glacier surface: a case study of Foxfonna, a small Arctic glacier
    • Krystyna Kozioł
    • Helen Moggridge
    • Joseph Cook
    • Andy Hodson
    2019 Full text EARTH SURFACE PROCESSES AND LANDFORMS

    Arctic glaciers are rapidly responding to global warming by releasing organic carbon (OC) to downstream ecosystems. The glacier surface is arguably the most biologically active and biodiverse glacial habitat and therefore the site of important OC transformation and storage, although rates and magnitudes are poorly constrained. In this paper, we present measurements of OC fluxes associated with atmospheric deposition, ice melt, biological growth, fluvial transport and storage (in superimposed ice and cryoconite debris) for a supraglacial catchment on Foxfonna glacier, Svalbard (Norway), across two consecutive years.We found that in general atmospheric OC input (averaging 0.63 ± 0.25Mg a-1 total organic carbon, i.e. TOC, and 0.40 ± 0.22Mg a-1 dissolved organic carbon, i.e. DOC) exceeded fluvial OC export (0.46 ± 0.04Mg a-1 TOC and 0.36 ± 0.03Mg a-1 DOC). Early in the summer, OC was mobilised in snowmelt but its release was delayed by temporary storage in superimposed ice on the glacier surface. This delayed the export of 28.5% of the TOC in runoff. Biological production in cryoconite deposits was a negligible potential source of OC to runoff, while englacial ice melt was far more important on account of the glacier’s negative ice mass balance (–0.89 and –0.42m a-1 in 2011 and 2012, respectively). However, construction of a detailed OC budget using these fluxes shows an excess of inputs over outputs, resulting in a net retention of OC on the glacier surface at a rate that would require c. 3 years to account for the OC stored as cryoconite debris. © 2018 John Wiley & Sons, Ltd.

  • Organizational IT Competency, Knowledge Workers and Knowledge Sharing
    • Wioleta Kucharska
    • G. Scott Erickson
    2019

    IT competency plays a vital role in knowledge management processes. Information technology affects an organization’s ability to store and recall knowledge that has been made explicit through codification, including different forms such as written documents, reports, presentations, patents, formulas, etc. This study aims to measure the influence of a company’s IT competency dimensions such as IT-knowledge, IT-operations, and IT-infrastructure on knowledge sharing. For this purpose, a survey of 910 Polish employees with different roles and experiences and across different industries has been conducted. The data were analyzed with a structural equation modeling method (SEM). Findings suggest that infrastructure is not a significant IT competency when it comes to knowledge sharing, whereas IT-knowledge and IT- operations are. It means that infrastructure should be perceived as a necessary but not sufficient factor to ensure the knowledge-sharing flow in organizations. This conclusion leads to the interesting implication that IT-operations and IT-knowledge are actually the vital factors to support effective knowledge sharing. It means that business case knowledge, which is pivotal for effective operations is fundamental for developing IT competency. It means that knowledge workers who act as “bridges” between IT and business operations became more and more valuable human capital assets.

  • Oriented Gaussian beams for high-accuracy computation with accuracy control of X-ray propagation through a multi-lens system
    • Paweł Wojda
    • Sergey Kshevetskii
    2019 Full text JOURNAL OF SYNCHROTRON RADIATION

    A highly accurate method for calculating X-ray propagation is developed. Within this approach, the propagating wave is represented as a superposition of oriented Gaussian beams. The direction of wave propagation in each Gaussian beam agrees with the local direction of propagation of the X-ray wavefront. When calculating the propagation of X-ray waves through lenses, the thin lens approximation is applied. In this approximation, the wave parameters change discontinuously when the wave passes through a lens; the corresponding explicit formulae are derived. The theory is applied to highly accurate calculation of the focusing of X-rays by a system of many beryllium lenses. Fine structure of the wave electric field on the focal plane is revealed and studied. The fine structure is formed due to the diffraction of waves at the edges of the lens apertures. Tools for controlling the calculation accuracy are proposed. The amplitude of the electric field on the focal plane and the focal spot width are shown to be very sensitive to the quality of the calculation, while the best focus position can be obtained even from simple calculations.

  • Origin of bitumen fractions in the Jurassic-early Cretaceous Vaca Muerta Formation in Argentina: insights from organic petrography and geochemical techniques
    • Aleksandra Małachowska
    • Maria Mastalerz
    • Labraun Hampton
    • Jan Hupka
    • Agnieszka Drobniak
    2019 INTERNATIONAL JOURNAL OF COAL GEOLOGY

    This paper investigates chemical functional groups of the two extracted bitumen fractions in shales of the Jurassic to early Cretaceous Vaca Muerta Formation of the Neuquén Basin in Argentina, South America. The results indicate that Bitumen I is strongly aliphatic and appears to be genetically related to fluorescent amorphous organic matter. In contrast, Bitumen II consists of highly condensed, aromatic hydrocarbons, and has some correspondence to nonfluorescent amorphous organic material. Comparison of Rock-Eval VI pyrolysis data (S1 and S2) with the bitumen yields suggests that Bitumen I relates to S1 but also to S2. In addition, Bitumen I has a positive correlation with light liquid hydrocarbons (C5–C29), but also partially with heavier hydrocarbons (above C30). This suggests that Bitumen I corresponds to the majority of lighter hydrocarbons up to C29 and some portion to heavier hydrocarbons. These results have implications for the assessment of the mobility of generated hydrocarbons and their availability for production.

  • Orteza bioniczna kończyny górnej
    • Gustaw Rzyman
    2019 Full text Wyroby Medyczne

    Zastosowanie robotyki we współczesnej medycynie jest powszechną praktyką. Również w rehabilitacji po udarze i urazie rdzenia kręgowego możliwe jest zwiększenie skuteczności leczenia dzięki bionicznej ortezie kończyny górnej. Na wczesnym etapie stworzono model matematyczny i porównano trzy metody klasyfikacji: maszyną wektorów nośnych, K najbliższych sąsiadów i metoda drzewa decyzyjnego. Ponadto zastosowano najlepszy zestaw domen czasowych (MAV, WAMP, WL i SSC) i wybrano takie parametry, aby model charakteryzował się najwyższą efektywnością.

  • Osetia Południowa razem czy osobno?
    • Krystyna Gomółka
    2019

    Osetia Południowa razem czy osobno?

  • Osoby ze spektrum zaburzeń autystycznych w cyfrowym środowisku pracy – przegląd rozwiązań technologicznych wspierających integrację
    • Michał Tomasz Tomczak
    2019 Full text Edukacja Ekonomistów i Menedżerów

    Celem artykułu jest analiza możliwości wykorzystania technologii wspomagających w obszarze modyfikacji środowiska pracy w celu integracji w jego obrębie osób ze spektrum zaburzeń autystycznych (ASD). Rozwiązaniem może być szersze wykorzystywanie elektronicznych form komunikacji, jak komunikatory, chaty i chatboty. Ponadto wprowadzenie elektronicznych systemów monitorujących poziom stresu i ułatwiających jego kontrolowanie, a w przyszłości zaprojektowanie całego środowiska pracy zgodnie z koncepcją „smart workplace”, współpracującego z siecią czujników rejestrujących parametry ciała człowieka oraz połączonych z czujnikami i kontrolerami dostosowującymi parametry otoczenia. W rezultacie, czynniki rozpraszające i obniżające wydajność pracy mogłyby zostać w znaczący sposób ograniczone lub wyeliminowane, zwiększając komfort pracy takich osób, jak i również ich współpracowników.

  • Oszacowanie ilości wód opadowych możliwych do wykorzystania na cele gospodarcze na przykładzie miasta o średniej wielkości w aspekcie zrównoważonego zagospodarowania wód opadowych
    • Aleksandra Pieniaszek
    • Ewa Wojciechowska
    2019

    Wody opadowe stanowią potencjalne źródło wody o obniżonej jakości, którą można wykorzystać do celów gospodarczych. Oszacowanie wielkości poboru wody wykorzystywanej do tych celów i wyznaczenie korelacji poboru wody ze wzrostem temperatury i niedosytem wilgotności, pozwoli na predykcję czasu i wielkości retencji zbiornikowej wód opadowych. Podczas występowania opadów atmosferycznych, do analizowanego systemu kanalizacyjnego, bezpowrotnie odprowadzana jest taka ilość wód opadowych, którą poprzez implementację rozwiązań zrównoważonego gospodarowania wodami opadowymi, można pokryć zapotrzebowanie wody na cele mycia placów i ulic, polewania zieleni miejskiej, podlewania ogrodów, czy nawadniania upraw.

  • Ośrodki wzrostu na obszarach peryferyjnych regionów. W poszukiwaniu kapitału terytorialnego
    • Jacek Sołtys
    2019 Full text BIULETYN KOMITETU PRZESTRZENNEGO ZAGOSPODAROWANIA KRAJU PAN

    Przedmiotem badań były gminy miejskie i miejsko-wiejskie na obszarach peryferyjnych województw, czyli poza obszarami funkcjonalnymi miast wojewódzkich i aglomeracji śląskich. Cele badań było: (1) rozpoznanie najbardziej rozwiniętych gospodarczo gmin na badanym obszarze; (2) rozpoznanie, w jaki sposób czynniki rozwojowe i ich kombinacje, które mogą tworzyć kapitał terytorialny, są postrzegane i wykorzystywane w strategiach miejskich. Metody objęły: (1) analizę wskaźników (2) analizę tekstów 10 strategii gmin o wysokim poziomie rozwoju. Stwierdzono niedostatek specyficznych czynników rozwojowych i rozpoznania ich kombinacji, a także brak wykorzystania ich do stworzenia przewagi konkurencyjnej.

  • Oświetlenie spersonalizowane?
    • Natalia Sokół
    2019 Full text Oświetlenie LED

    Światło dzienne i elektryczne padające na siatkówkę oka ludzkiego wpływa na to, jak postrzegamy otaczający nas świat. Ostatnie badania pokazują, że światło padające na korę wzorokową oddziałuje także na inne, niewzorokowe funkcje życiowe człowieka. Zaczęto mówić o efektywności biologicznej lub wydajności biologicznej światła. Wykazano, że zależy ona od wielu czynników, między innymim. in. od widmowego, przestrzennego i czasowego rozkładu promieniowania optycznego, ale także od indywidualnych cech organizmu ludzkiego, indywidualnej charakterystyki rytmu okołodobowego, wrażliwości na światło, wieku i wielu innych aspektów. Jak zatem zmierzyć wszystkie efekty biologiczne ekspozycji na światło o określonej charakterystyce fotometrycznej? I jak stworzyć optymalne warunki świetlne do nauki, pracy lub wypoczynku dla jednostek o zróżnicowanych wymaganiach?

  • Otwarte innowacje w inicjatywach klastrowych
    • Anna Lis
    • Adrian Lis
    2019 Full text PRZEGLĄD ORGANIZACJI

    Specyfika funkcjonowania inicjatyw klastrowych czyni z nich idealne podłoże do wcielania w życie idei open innovation – ułatwiają bowiem nawiązywanie kontaktów z innymi podmiotami, stawiają na otwartość swoich członków i budowę relacji opartych na zaufaniu, stanowią platformę wymiany zasobów (w tym przede wszystkim informacji i wiedzy) oraz wspólnego kreowania rozwiązań innowacyjnych. W artykule podjęto rozważania teoretyczne dotyczące wykorzystania koncepcji innowacji otwartych w inicjatywach klastrowych. Celem niniejszego artykułu jest przedstawienie powiązań poziomów współpracy klastrowej z elementami konstytuującymi innowacje otwarte. Główną metodą badawczą był przegląd literatury przedmiotu oraz teoretyczna aplikacja autorskiej koncepcji trajektorii rozwoju powiązań kooperacyjnych opracowanej na podstawie badań dotyczących współpracy w inicjatywach klastrowych i roli bliskości w rozwoju tejże współpracy. Rozważania przeprowadzone przez autorów potwierdziły istotność zaufania jako kryterium dostępu do najcenniejszych informacji i wiedzy w inicjatywach klastrowych. Wskazały również, że żaden z czterech wyróżnionych poziomów współpracy klastrowej nie korespondował z innowacjami otwartymi w formie „Inside-Out” (odśrodkowej). Poziomy współpracy I i III mieściły się w obrębie ścieżki „Outside-In” (dośrodkowej), zaś poziomy II i IV korespondowały ze ścieżką „Coupled” (sprzężoną).

  • Overhead wires detection by FPGA real-time image processing
    • Paweł Kowalski
    • Robert Smyk
    2019 Full text ITM Web of Conferences

    The paper presents design and hardware implementation of real-time image filtering for overhead wires detection divided on image processing and results presentation blocks. The image processing block was separated from the whole implementation, and its delay and hardware complexity was analysed. Also the maximum frequency of image processing of the proposed implementation was estimated.

  • Overheating of underground power cable line due to its partial exposition to solar radiation
    • Stanisław Czapp
    • Filip Ratkowski
    • Seweryn Szultka
    • Adam Tomaszewski
    2019

    Current-carrying capacity of underground power cable lines depends, among others, on thermal resistivity of the soil and cables layout: trefoil formation, flat formation with or without spacing. If conditions for heat transfer in the ground are favorable, the current-carrying capacity is relatively high. Therefore, it generates risk of the power cables overheating, if part of the cable line is located vertically in the air, to be connected with an overhead power line at its pole. Risk of the overheating is very high especially during strong solar radiation. The maximum permissible cable load for underground thermal condition is too optimistic for part of the cable line placed in the air. This paper presents computer modelling and simulations of thermal conditions of an underground low-voltage cable line, which part is located at the pole of the overhead line. Results of simulations indicate that part of the cables in the air can be strongly overheated.

  • Oxidation kinetics of Zircaloy-4 alloy at 673 K determined by GDOES technique
    • Bartlomiej Trybuś
    • Jean-marc Olive
    • Andrzej Zieliński
    2019 Inżynieria Materiałowa

    Oxidation of zirconium alloys is a process that takes place during the operation of nuclear reactors and is essential for assessing the durability of fuel claddings. The present study was aimed to determine the oxidation kinetics of the Zircaloy-4 alloy using GDOES (glow discharge optical emission spectroscopy) at temperature 673 K corresponding to the conditions of use of fuel pellets. The tests were performed on non-oxidized samples as well as after their oxidation for 0.5, 2, 15 and 48 h. Oxygen layer growth was also investigated by thermogravimetric analysis after oxidation for 0.5 h. The naturally generated oxide at room temperature, designated as non-oxidized, has a thickness of 23±2 nm. After 2 h oxidation, an oxide possessing a thickness of 42±4 nm with about 155 nm of oxygen traces was observed. Oxidation for 15 h resulted in formation of an oxide with a thickness of 130±10 nm with a transition distance to the pure alloy of 240 nm. Finally, a layer with a thickness of 235±10 nm appeared after oxidation for 48 h, while the distance after which the measurement includes only a pure alloy without the oxygen traces is about 310 nm. The results show that oxidation can be described by the exponential kinetic equation, what has the parabolic form after 15 or 48 h of oxidation, which well fit the previous results. However, at shorter oxidation times the kinetic equation has the quasi-parabolic form (n < 2). The reason for changing the form of the equation can be attributed to the effect of defective crystalline structure on oxygen diffusion in the oxide layer as the porosity, crevices and cracks.

  • Parametric design in architectural education
    • Jan Cudzik
    • Kacper Radziszewski
    2019 Full text World Transactions on Engineering and Technology Education

    Educators dealing with architectural education must anticipate the changes in the discipline and act to prepare students to face the challenges of the future. Therefore, it is necessary to provide them with state-of-the-art knowledge and relevant skills. To achieve that for new design techniques requires education. One new technique is parametric design, which has become one of the commonly used tools in architectural design practice. An overview is provided in this article of the present teaching programme, concerning parametric design, in the Faculty of Architecture at Gdańsk University of Technology (FA-GUT), Gdańsk, Poland.

  • Parametric method applicable in calculating breakout force and time for lifting axisymmetric objects from seabed.
    • Jan Michalski
    2019 Full text Polish Maritime Research

    The issue of calculating parameters for lifting objects of axisymmetric shapes from the seabed is studied. The article presents the results of numerical simulation examination of the equation formulated by Foda for the force needed to extricate the object from the seabed depending on soil and water parameters, extrication speed, and object diameter. The simulations were performed within the range of parameters characteristic for real applications, and their results were used for deriving approximate algebraic formulas applicable in engineering practice of lifting objects resting on seabed.

  • Parametry kinematyczne docierarek tarczowych
    • Adam Barylski
    2019

    Omówiono analizę kinematyki docierania powierzchni płaskich w układach jedno- i dwutarczowych. Przedstawiono opracowane modele standardowych układów kinematycznych. Wyznaczono zakresy zmienności prędkości docierania i wartości przyspieszeń w analizowanych układach kinematycznych

  • Parametryczna estymacja widma lokalnie stacjonarnych procesów losowych
    • Damian Chojnacki
    2019 Full text

    W niniejszej pracy doktorskiej opisano nowe metody estymacji widmowej gestosci mocy niestacjonarnych procesów stochastycznych. Przedstawione w rozprawie rozwiazania, takie jak dwukierunkowy algorytm drabinkowy z zapominaniem wykładniczym oraz metoda usredniania modeli umozliwiaja precyzyjna estymacje charakterystyk widmowych. Przeprowadzone symulacje potwierdziły, ze opracowane algorytmy daja zadowalajace rezultaty zarówno w przypadku łagodnych jak i gwałtownych zmian wartosci parametrów analizowanego sygnału. Wopisanych algorytmach zastosowano metody jednoczesnego wyboru rzedu estymowanego modelu oraz pasma estymacji. Obydwie wielkosci maja bezposredni wpływ na skutecznosc estymacji zarówno pod wzgledem jakosciowym (adekwatnosc) jak i ilosciowym (dokładnosc). Wyniki eksperymentów potwierdzaja jednoznacznie teze pracy, iz zastosowanie metod adaptacyjnego wyboru rzedu modelu oraz pasma estymacji stosowanego w procesie jego identyfikacji umozliwia zwiekszenie dokładnosci parametrycznej oceny widma chwilowego modelowanego procesu niestacjonarnego.

  • Partycypacja obywatelska młodzieży z perspektywy polskich i litewskich instytucji na przykładzie projektu South Baltic Youth Core Group Network
    • Krystyna Gomółka
    • Izabela Borucińska
    2019 Full text Przegląd Politologiczny

    Celem artykułu było ukazanie partycypacji obywatelskiej młodzieży w opinii pracowników instytucji działających na terenie 5 polskich gmin: Dzierzgoń, Elbląg, Gdynia, Iława i Nowe Miasto Lubawskie i litewskiej gminy Teslai. W ramach projektu SB YCGN przeprowadzono badanie metodą sondażu diagnostycznego z wykorzystaniem techniki ankiety internetowej na 118 respondentach z 53 polskich instytucji i 47 respondentach z 10 litewskich instytucji. Na podstawie wyników badań ilościowych potwierdzono hipotezę: podobieństwa w zakresie poziomu partycypacji obywatelskiej młodzieży, barier, potrzeb i efektywnych metod działania w badanych gminach z Polski i Litwy determinują potrzebę zacieśniania współpracy transgranicznej

  • Patomechanizm zakażeń dróg moczowych wywoływanych przez uropatogenne szczepy E. coli
    • Beata Zalewska-Piątek
    • Rafał Piątek
    • Beata Krawczyk
    • Marcin Olszewski
    2019 Full text Postępy Higieny i Medycyny Doświadczalnej

    Zakażenia układu moczowego (ZUM) to jedne z najczęstszych i najbardziej powszechnych infekcji bakteryjnych, dotykających każdego roku nawet 150 milionów ludzi na świecie. Problem z tego typu infekcjami wynika z przewlekłości choroby, nawrotów i wzrastającej lekooporności powodujących je patogenów. Uropatogenne szczepy E. coli (UPEC) są głównym czynnikiem przyczynowym ZUM. Bakterie tej grupy zawierają wiele czynników adhezyjnych umiejscowionych na powierzchni ich komórek, które odpowiadają za wstępny etap bakteryjnej adherencji i kolonizację dróg moczowych. Spośród UPEC najbardziej rozpowszechnione są monoadhezyjne pile typu 1 i P oraz poliadhezyny rodziny Dr, których biogeneza odbywa się według zakonserwowanego systemu sekrecji typu „chaperone-usher” (CUP). Poza czynnikami urowirulencji, szczepy UPEC wykształciły wiele mechanizmów istotnych w patogenezie ZUM i umożliwiających im przetrwanie w środowisku dróg moczowych (adhezja, inwazja, formowanie wewnątrzkomórkowych agregatów i wyciszonych rezerwuarów bakteryjnych, filamentacja bakterii, oporność na antybiotyki). Powszechnie stosowana terapia antybiotykowa wydaje się bardzo skuteczna w kontrolowaniu i terapii ZUM, jednak narastająca wielolekooporność szczepów bakteryjnych, jak i bardzo częste nawroty zakażeń, są podstawą rozwoju alternatywnych form terapeutycznych i strategii prewencyjnych.

  • PCR-RFLP assays for species-specific identification of fungi belonging to Scopulariopsis and related genera
    • Milena Kordalewska
    • Jolanta Kalita
    • Zofia Bakuła
    • Anna Brillowska-Dąbrowska
    • Tomasz Jagielski
    2019 MEDICAL MYCOLOGY

    Fungi of the Scopulariopsis genus, commonly found in the environment, are opportunistic pathogens that can cause various types of human infections. So far, no efficient molecular method has been developed for species differentiation among Scopulariopsis and related genera. In order to advance this field, we have evaluated performance of polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) assays, based on cytochrome c oxidase subunit 1 and β-tubulin genes. The assays resulted in 2–10 restriction patterns, depending on the gene amplified and restriction enzyme applied. Pooled analysis of the patterns allowed to propose an algorithm, that can be successfully used for an accurate species-specific identification of 21 species of the Scopulariopsis-like fungi.

  • Peptide conjugates of lactoferricin analogues and antimicrobials—Design, chemical synthesis, evaluation of antimicrobial activity and mammalian cytotoxicity
    • Natalia Ptaszyńska
    • Katarzyna Olkiewicz
    • Joanna Okońska
    • Katarzyna Gucwa
    • Anna Łęgowska
    • Agata Gitlin-Domagalska
    • Dębowski Dawid
    • Jan Jakub Lica
    • Mateusz Heldt
    • Sławomir Milewski
    • Tzi Ng
    • Krzysztof Rolka
    2019 PEPTIDES

    Eight new peptide conjugates composed of modified bovine lactoferricin truncated analogues (LFcinB) and oneof the three antimicrobials — ciprofloxacin (CIP), levofloxacin (LVX), and fluconazole (FLC) — were synthesized. Four different linkers were applied to connect a peptide and an antimicrobial agent. The FLC-containing peptidic conjugates were synthesized using the “click chemistry” method. This novel approach is reported here for the first time. Unlike their components, CIP- and LVX-based conjugates exerted activity against Candida yeast. Similarly to the constituent peptides, synthesized conjugates showed activity against Gram-positive bacteria, especially S. epidermidis. The most active were the conjugates containing CIP linked to the peptide by the redox-sensitive disulfide bridge. Our results show a significant role of a linker between antimicrobial agent and a peptide. This was also confirmed by the lack of synergistic effects on the antimicrobial activity of the constituent compounds. Moreover, cytotoxicity assays revealed that the proposed conjugates cause a comparatively low cytotoxic effect in reference to antibiotics widely used in therapies. Therefore, they can be deliberated as attractive leading structures for the development of drugs.

  • Perceptions of Gender Diversity's Impact on Mood in Software Development Teams
    • Kelly Blincoe
    • Olga Springer
    • Michał Wróbel
    2019 Full text IEEE SOFTWARE

    Gender inequality persists in IT teams. We examine how gender differentiation affects the workplace atmosphere and analyze the results of our study of the issue. We discuss the problem of gender discrimination and consider methods to reduce inequality

  • Performance evaluation of Unified Memory with prefetching and oversubscription for selected parallel CUDA applications on NVIDIA Pascal and Volta GPUs
    • Marcin Knap
    • Paweł Czarnul
    2019 Full text JOURNAL OF SUPERCOMPUTING

    The paper presents assessment of Unified Memory performance with data prefetching and memory oversubscription. Several versions of code are used with: standard memory management, standard Unified Memory and optimized Unified Memory with programmer-assisted data prefetching. Evaluation of execution times is provided for four applications: Sobel and image rotation filters, stream image processing and computational fluid dynamic simulation, performed on Pascal and Volta architecture GPUs—NVIDIA GTX 1080 and NVIDIA V100 cards. Furthermore, we evaluate the possibility of allocating more memory than available on GPUs and assess performance of codes using the three aforementioned implementations, including memory oversubscription available in CUDA. Results serve as recommendations and hints for other similar codes regarding expected performance on modern and already widely available GPUs.

  • Performance measurements and optimization of visualization of routes traveled in the distributed dispatcher and teleinformation system for visualization of multimedia data for the Border Guard
    • Bartosz Czaplewski
    • Marek Blok
    • Sylwester Kaczmarek
    • Marcin Narloch
    2019

    Monitoring of country maritime border is an important task of the Border Guard. This activity can be enhanced with the use of the technology enabling gathering information from distributed sources, processing of that information and its visualization. The system presented in the paper is an advancement of the previously developed distributed map data exchange system. The added functionality allows to supplement the map data with multimedia (telephone and radio calls, video (cameras), photos, files, SMS) and presentation of current and archival situation on a multidisplay screen in the Events Visualization Post. The performance tests, and in particular the measurement of waiting times for responses, show that the biggest influence on the Center server delays is the handling of messages regarding visualization of traveled routes. Therefore, it was decided to optimize the way of visualization of traveled routes on digital maps in order to reduce the amount of overload of the Center. The main focus of this article is a description of the concept of a new method of visualization of traveled routes and a new way of retrieving data on traveled routes. In addition, the paper sets further direction for the development of the STRADAR system, such as visualization of radar data from a new type of radar devices, control of cameras at observation points, monitoring of system components, and more.

  • Performance of Coherent Modulation Scheme Used in Acoustic Underwater Communication System
    • Jan Schmidt
    • Aleksander Schmidt
    • Iwona Kochańska
    2019 Full text Vibrations in Physical Systems

    The development of an acoustic underwater communication system for shallow waters is still a big scientificand construction challenge. Currently, non-coherent modulations in combination with strong channel coding are used to achieve reliable communication with low rate in such a channel. To obtain transmission with a higher transmission rate, it is required to use coherent modulation. This paper presents the assumptions of such a transmission system and the results of data transmission carried out by this system in the channel with the Rician fading, which reflects the short range shallow water channel. A digital version of the carrier phase modulation known as Phase-Shift Keying was selected for simulation.

  • Performance of microbial fuel cells operated under anoxic conditions
    • Stanislaw Marks
    • Jacek Mąkinia
    • Francisco Morales
    2019 APPLIED ENERGY

    Nowadays, microbial fuel cells (MFC) stand up as a promising renewable energy source. Due to the ability of the MFC to oxidize a wide spectrum of substrates, wastewater seems to be one of the most interesting fuels. Unfortunately, wastewater could contain electron acceptors such as nitrate, which could interfere with the electrical performance of the MFC. In this work, the influence of oxidised nitrogen forms on the electricity production of an air breathing MFC was studied. It was observed that power generation was not significantly influenced when operated at nitrate concentrations below 0.9 mg N-NO3 L−1. However, when the nitrate concentrations were above this value, the electricity generation was reduced. In order to investigate the causes of this reduction, an electrochemical characterization of the MFC was performed. The results of polarization curves were fitted to an empirical mathematical model. From the results it was observed that, when nitrate was present, the denitrifiers outcompeted the electrogenic microorganisms for substrate, causing mass transfer limitations to the electrogenic process.

  • Performance of the very high-temperature heat pump with low GWP working fluids
    • Dariusz Mikielewicz
    • Jan Wajs
    2019 ENERGY

    Traditional heat pumps are a very attractive pro-ecological solutions for a number of applications, including providing of heating or heat recovery from industrial processes. The application range of heat pumps could be greatly enlarged when the operating temperature would be increased to 130-150°C and/or the temperature lift can be increased to 50-100 K. In the paper, the very high temperature vapour-compressor based single stage and cascade heat pumps with a number of working fluids are presented. In author's opinion, it has a significant potential for various applications. In described analysis it was assumed that that heat source has a temperature of 50°C, whereas the condensation temperature is 130°C. On the basis of obtained results the working fluid temperatures, heat rates and the coefficient of performance of proposed solution have been determined.

  • Performance-Based Nested Surrogate Modeling of Antenna Input Characteristics
    • Sławomir Kozieł
    • Anna Pietrenko-Dąbrowska
    2019 Full text IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION

    Utilization of electromagnetic (EM) simulation tools is mandatory in the design of contemporary antenna structures. At the same time, conducting designs procedures that require multiple evaluations of the antenna at hand, such as parametric optimization or yield-driven design, is hindered by a high cost of accurate EM analysis. To certain extent, this issue can be addressed by utilization of fast replacement models (also referred to as surrogates). Unfortunately, due to curse of dimensionality, traditional data-driven surrogate modeling methods are limited to antenna structures described by a few parameters with relatively narrow parameter ranges. This is by no means sufficient given the complexity of modern designs. In this paper, a novel technique for surrogate modeling of antenna structures is proposed. It involves a construction of two levels of surrogates, both realized as kriging interpolation models. The first model is based on a set of reference designs optimized for selected performance figures. It is used to establish a domain for the final (second-level) surrogate. This formulation permits efficient modeling within wide ranges of antenna geometry parameters and wide ranges of performance figures (e.g., operating frequencies). At the same time, it allows uniform allocation of training data samples in a straightforward manner. Our approach is demonstrated using two microstrip antenna examples and compared to conventional kriging and radial basis function modeling. Application examples for antenna optimization are also provided along with experimental validation.

  • Periodic expansion in determining minimal sets of Lefschetz periods for Morse–Smale diffeomorphisms
    • Grzegorz Graff
    • Małgorzata Lebiedź
    • Adrian Myszkowski
    2019 Full text Journal of Fixed Point Theory and Applications

    We apply the representation of Lefschetz numbers of iterates in the form of periodic expansion to determine the minimal sets of Lefschetz periods of Morse–Smale diffeomorphisms. Applying this approach we present an algorithmic method of finding the family of minimal sets of Lefschetz periods for Ng, a non-orientable compact surfaces without boundary of genus g. We also partially confirm the conjecture of Llibre and Sirvent (J Diff Equ Appl 19(3):402–417, 2013) proving that there are no algebraic obstacles in realizing any set of odd natural numbers as the minimal set of Lefschetz periods on Ng for any g.

  • Periodic Points for Sphere Maps Preserving MonopoleFoliations
    • Grzegorz Graff
    • Michał Misiurewicz
    • Piotr Nowak-Przygodzki
    2019 Full text Qualitative Theory of Dynamical Systems

    Let S^2 be a two-dimensional sphere. We consider two types of its foliations with one singularity and maps f:S^2→S^2 preserving these foliations, more and less regular. We prove that in both cases f has at least |deg(f)| fixed points, where deg(f) is a topological degree of f. In particular, the lower growth rate of the number of fixed points of the iterations of f is at least log|deg(f)|. This confirms the Shub’s conjecture in these classes of maps.

  • Permeability of the small intestinal mucus for physiologically relevant studies: Impact of mucus location and ex vivo treatment
    • Adam Macierzanka
    • Alan Mackie
    • Łukasz Krupa
    2019 Full text Scientific Reports

    The small intestinal mucus is a complex colloidal system that coats the intestinal mucosa. It allows passage on nutrients/pharmaceuticals from the gut lumen towards the epithelium, whilst preventing it from direct contact with luminal microorganisms. Mucus collected from intestinal tissue is often used in studies looking at inter-mucosal transport of food particulates, drug carriers, etc. However, detaching the highly hydrated native mucus from the tissue and storing it frozen prior to use may disrupt its physiological microstructure, and thus selective barrier properties. Multiple-particle tracking experiments showed that microstructural organisation of native, jejunal mucus depends on its spatial location in the intestinal mucosa. The inter-villus mucus was less heterogeneous than the mucus covering villi tips in the pig model used. Collecting mucus from tissue and subjecting it to freezing and thawing did not significantly affect (P > 0.05) its permeability to model, sub-micron sized particles, and the microviscosity profile of the mucus reflected the overall profiles recorded for the native mucus in the tissue. This implies the method of collecting and storing mucus is a reliable ex vivo treatment for the convenient planning and performing of mucus-permeability studies that aim to mimic physiological conditions of the transport of molecules/particles in native mucus.

  • Persistent organic pollutants (POPs) as an indicator of surface water quality in the vicinity of the Polish Polar Station, Horsund
    • Filip Pawlak
    • Krystyna Kozioł
    • Marek Ruman
    • Żaneta Polkowska
    2019 Full text MONATSHEFTE FUR CHEMIE

    Surface waters were collected in the vicinity of the Polish Polar Station in Hornsund (Svalbard) to determine their concentration of various persistent organic pollutants (POPs), such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs). In addition, parameters such as pH, SEC and TOC were measured. In total, 15 samples of lake water from and 15 samples of stream water were analysed. The sampling took place between August and September 2010. Total PAHs and PCBs concentrations in surface water ranged from < LOD to 6212 ng/dm3 and < LOD to 273 ng/dm3. Moreover, the main compounds detected in the samples from these two groups were naphthalene and PCB 153. Based on the cluster analysis, it was found that there are no significant differences between the water taken from the lakes and the water taken from the streams.

  • Person Tracking in a Ferry Environment Using Ultra-Wide Band Radio Interface
    • Piotr Rajchowski
    • Krzysztof Cwalina
    • Jarosław Sadowski
    2019

    This article presents research and analysis of effectiveness of tracking moving people in an environment of passenger ferry, using measurements of propagation time of ultra-wide band radio signal (UWB - Ultra-Wide Band). Constructed measurement stand and results of measurements carried out in a real propagation conditions were shortly discussed.