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Publications Repository
Gdańsk University of Technology

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Publications from the year 2017

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  • Niesterydowe leki przeciwzapalne stosowane jako substancje dopingujące w sportach konnych
    • Emilia Waraksa
    • Marzena Wójtowicz
    • Dorota Kwiatkowska
    • Anna Jarek
    • Jacek Namieśnik
    2017 Analityka: Nauka i Praktyka

    Niesterydowe leki przeciwzapalne są często stosowane w rywalizacji sportowej z udziałem koni w celu ukrycia problemu zdrowotnego zwierzęcia. Takie podejście jest sprzeczne z zasadami etyki w sportach konnych oraz dobrem koni.

  • Nieukierunkowana analiza fosfolipidów w próbkach biologicznych i żywności Cz. I. Ekstrakcja frakcji lipidowej i podstawowe techniki analityczne w analizie fosfolipidów
    • Karol Parchem
    • Agnieszka Bartoszek-Pączkowska
    2017 Analityka: Nauka i Praktyka

    Fosfolipidy odgrywają istotną rolę w prawidłowym funkcjonowaniu organizmu ludzkiego. Z tego względu zalecane jest ich codzienne dostarczanie wraz z pożywieniem. Ponieważ aktywność biologiczna fosfolipidów uwarunkowana jest budową chemiczną, niezbędne jest zastosowanie technik analitycznych pozwalających na ustalenie pełnego składu fosfolipidów występujących w żywności, uwzględniające nie tylko klasy fosfolipidów determinowane budową ugrupowania hydrofilowego, ale także rodzaj kwasów tłuszczowych występujących w ich strukturze. Określenie wpływu związków lipidowych występujących w organizmie ludzkim na jego funkcjonowanie wymaga poznania ich składu, co umożliwiają analizy ukierunkowane i nieukierunkowane. Obecnie stosowanych jest szereg technik analitycznych pozwalających na jakościowe i ilościowe określenie składu klas fosfolipidów, do których zaliczyć można jedno- i dwuwymiarową chromatografię cienkowarstwową, czy wysokosprawną chromatografię cieczową w układzie faz normalnych lub oddziaływań hydrofilowych. Informacji na temat składu kwasów tłuszczowych występujących w strukturze poszczególnych klas fosfolipidów dostarcza z kolei wysokosprawna chromatografia cieczowa w układzie faz odwróconych oraz chromatografia gazowa.

  • Nieukierunkowana analiza fosfolipidów w próbkach biologicznych i żywności Część II. Zaawansowane techniki analityczne w analizie fosfolipidów
    • Karol Parchem
    • Agnieszka Bartoszek-Pączkowska
    2017 Analityka: Nauka i Praktyka

    Rozwój zaawansowanych technik analitycznych, który miał miejsce na przestrzeni ostatnich lat, w znaczący sposób przyczynił się do rozwoju lipidomiki – nauki mającej na celu określenie roli związków lipidowych w funkcjonowaniu systemów biologicznym, w tym ludzkiego organizmu. Nieukierunkowana analiza dostarczanych do organizmu i występujących w nim lipidów wymaga zastosowania wysokorozdzielczych technik analitycznych. Wprowadzenie spektrometrów NMR o coraz wyższej częstotliwości pozwoliło na uzyskanie szczegółowych informacji na temat klas fosfolipidów występujących w badanej próbce, zarówno na podstawie widm jednowymiarowych (31P NMR) oraz dwuwymiarowych (31P-1H NMR). Dostępność komercyjnych rozwiązań pozwalających na analizę fosfolipidów przy zastosowaniu dwuwymiarowej chromatografii cieczowej umożliwiła uzyskanie w trakcie pojedynczej analizy informacji dotyczącej zarówno składu klas fosfolipidów, ale także rodzaju kwasów tłuszczowych występujących w ich strukturze. Możliwość identyfikacji tysięcy związków lipidowych pojawiła się dzięki zastosowaniu spektrometrii mas, a zwłaszcza wprowadzeniu spektrometrów mas wyposażonych w wysokorozdzielcze analizatory. Jedną z najnowszych technik wykorzystywanych w analizie fosfolipidów jest spektrometria ruchliwości jonów dostarczająca informacji na temat składu fosfolipidów w oparciu o kształt i wielkość poszczególnych cząsteczek.

  • Nitrogen dioxide sensing properties of PEDOT polymer films
    • Katarzyna Dunst
    • Jakub Karczewski
    • Piotr Jasiński
    2017 Full text SENSORS AND ACTUATORS B-CHEMICAL

    This work presents a simple and fully electrochemical route for the polymerization of poly(3,4-ethylenedioxytiophene) (PEDOT) films for fabricating a NO2 gas sensor prepared by electropolymerization of 3,4-Ethylenedioxythiophene (EDOT) monomer in lithium perchlorate/acetonitrile solution. The main aim of this study is to determine the sensing properties of conductive polymer at elevated temperatures. The effects of the humidity, working temperature and sensing response of the PEDOT to environmental gases are investigated. The use of the PEDOT film as NO2 gas meter of total flow of NO2 is evaluated.

  • Nodal cooperation equilibrium analysis in multi-hop wireless ad hoc networks with a reputation system
    • Jerzy Konorski
    • Karol Rydzewski
    2017 Full text

    Motivated by the concerns of cooperation security, this work examines selected principles of state-of-the-art reputation systems for multi-hop ad hoc networks and their impact upon optimal strategies for rational nodes. An analytic framework is proposed and used for identification of effective cooperation-enforcement schemes. It is pointed out that optimum rather than high reputation can be expected to be sought by rational nodes.

  • Nodal models of Pressurized Water Reactor core for control purposes – A comparison study
    • Bartosz Puchalski
    • Tomasz Adam Rutkowski
    • Kazimierz Duzinkiewicz
    2017 Full text NUCLEAR ENGINEERING AND DESIGN

    The paper focuses on the presentation and comparison of basic nodal and expanded multi-nodal models of the Pressurized Water Reactor (PWR) core, which includes neutron kinetics, heat transfer between fuel and coolant, and internal and external reactivity feedback processes. In the expanded multi-nodal model, the authors introduce a novel approach to the implementation of thermal power distribution phenomena into the multi-node model of reactor core. This implementation has the form of thermal power distribution coefficients which approximate the thermal power generation profile in the reactor. It is assumed in the model that the thermal power distribution is proportional to the axial distribution of neutron flux in the un-rodded and rodded reactor core regions, as a result of control rod bank movements. In the paper, the authors propose a methodology to calculate those power distribution coefficients, which bases on numerical solutions of the transformed diffusion equations for the un-rodded and rodded reactor regions, respectively. Introducing power distribution coefficients into the expanded multi-nodal model allows to achieve advanced capabilities that can be efficiently used in design and synthesis of more advanced and complex control algorithms for PWR reactor core, for instance in the field of reactor temperature distribution control.

  • Noise related to gas bottles explosions
    • Beata Świeczko-Żurek
    • Jerzy Ejsmont
    • Grzegorz Ronowski
    2017

    Modern industrialized world is in a never ending danger of accidents and catastrophes of technical nature. Some of them may involve fires and explosions of gas storage bottles or containers. Technical University of Gdansk, Poland performed numerous tests where bottles containing acetylene, oxygen, hydrogen, CO2, LPG, LNG or CNG were blown due to excessive temperature caused by fire. Although those experiments were not focused on noise problems, nevertheless certain noise and shock wave measurements were also peformed. The paper shows the results of those experiments both in terms of sound pressure levels and shock wave pressure.

  • Noise sources in Raman spectroscopy of biological objects
    • Janusz Smulko
    • Maciej Wróbel
    2017

    We present an overview of noise sources deteriorating the quality of the recorded biological Raman spectra and the ability to determine the specimen composition. The acquired Raman spectra exhibit intense additive noise components or drifts because of low intensity of the scattered light. Therefore we have to apply expensive or bulky measurement setups to limit their inherent noise or to apply additional signal processing to reduce random components after recording the spectra (e.g., Savitzky-Golay filtering, polynomial approximation, denoising by empirical mode decomposition). We present noise sources generated in detectors of Raman scattered photon stream. We consider the methods of background noise reduction by increasing averaging time when the background noise comprises of white noise and 1/f noise components. We consider how the background noise reduces the accuracy of chemical compounds estimation using Raman spectra and prediction model based on linear (e.g., Principal Component Analysis) or nonlinear (e.g., Support Vector Machine) methods. Finally, we give some remarks about synchronous detection and background noise reduction.

  • Non-destructive inspection of ground anchors using guided wave propagation
    • Beata Zima
    • Magdalena Rucka
    2017 INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

    This paper deals with numerical and experimental investigations of specific problems of guided wave propagation in ground anchors. The research focuses on recognizing the phenomenon of the energy transfer between anchor components. Particular attention is paid to characteristic features of guided waves propagating in free and embedded parts of the tendon, at the interface between the tendon and the surrounding anchor body as well as waves diffracted on the start of the anchor body. Anchors with variable lengths and diameters of the anchor body, as well as anchors with non-reflecting boundary conditions are analysed numerically. Experimental measurements are conducted on the laboratory models of ground anchors of different fixed lengths. The study shows that the detailed recognition of the phenomenon of the transfer of the wave energy between the tendon and the anchor body is crucial for the appropriate application of the guided wave propagation method for non-destructive inspection of ground anchors. The obtained results indicate that three the most important geometric parameters, i.e. the anchor body length, the free length of the tendon and the thickness of the anchor body, can be determined on the basis of wave propagation signals recorded at the free end of the anchor.

  • Non-Gaussian Resistance Fluctuations in Gold-Nanoparticle-Based Gas Sensors: An Appraisal of Different Evaluation Techniques
    • Łukasz Lentka
    • Janusz Smulko
    • Mateusz Kotarski
    • Claes-Goran Granqvist
    • Radu Ionescu
    2017 Full text SENSORS

    Volatile organic compounds, such as formaldehyde, can be used as biomarkers in human exhaled breath in order to non-invasively detect various diseases, and the same compounds are of much interest also in the context of environmental monitoring and protection. Here, we report on a recently-developed gas sensor, based on surface-functionalized gold nanoparticles, which is able to generate voltage noise with a distinctly non-Gaussian component upon exposure to formaldehyde with concentrations on the ppm level, whereas this component is absent, or at least much weaker, when the sensor is exposed to ethanol or to pure air. We survey four different statistical methods to elucidate a non-Gaussian component and assess their pros and cons with regard to efficient gas detection. Specifically, the non-Gaussian component was clearly exposed in analysis using level-crossing parameters, which require nothing but a modest computational effort and simple electronic circuitry, and analogous results could be reached through the bispectrum function, albeit with more intense computation. Useful information could be obtained also via the Lévy-stable distribution and, possibly, the second spectrum.

  • Non-isocyanate Polyurethanes
    • Marcin Włoch
    • Janusz Datta
    2017

    The main aim of this chapter is to present a general overview of the NIPU synthesis method (i.e., polycondensation and polyaddition), and to describe structure and properties of selected intermediates and final polymeric products. The focus is on five-membered ring cyclic carbonate intermediates, which were obtained by cycloaddition of carbon dioxide to selected glycidyl ethers and thiol-ene coupling of unsaturated cyclic carbonates monomers with thiols. We also discuss the synthesis and properties of bio-based NIPU, obtained from, e.g., carbonated vegetable oils.

  • Nonlinear Modeling in Time Domain Numerical Analysis of Stringed Instrument Dynamics
    • Paweł Michał Bielski
    • Marcin Kujawa
    2017 Full text

    Musical instruments are very various in terms of sound quality with their timbre shaped by materials and geometry. Materials' impact is commonly treated as dominant one by musicians, while it is unclear whether it is true or not. The research proposed in the study focuses on determining influence of both these factors on sound quality based on their impact on harmonic composition. Numerical approach has been chosen to allowed independent manipulation of geometrical and material parameters as opposed to experimental study subjected to natural randomness of instrument construction. Distinctive element of this research is precise modeling of whole instrument and treating it as one big vibrating system instead of performing modal analysis on an isolated part. Finite elements model of a stringed instrument has been built and a series of nonlinear time-domain dynamic analyses were executed to obtain displacement signals and perform subsequent spectral analysis. Precision of computations seems sufficient to determine the influence of instrument's macroscopic mechanical parameters on timbre. Further research should focus on implementation of acoustic medium in attempt to include dissipation and synchronization mechanisms. Outside the musical field this kind of research could be potentially useful in noise reduction problems.

  • Nonlinear phenomena of small-scale sound in a gas with exponential stratification
    • Anna Perelomova
    2017 Full text TASK Quarterly

    The nonlinear dynamics of perturbations, quickly varying in space, with comparatively large characteristic wavenumbers k: k>1/H, is considered. H is the scale of density and pressure reduction in unperturbed gas, as the coordinate (H is the so-called height of the uniform equilibrium gas). Coupling nonlinear equations which govern the sound and the entropy mode in a weakly nonlinear flow are derived. They describe the dynamics of the gas in the leading order, with an accuracy up to the terms (kH)^-1. In the field of the dominative sound mode, other induced modes contain parts which propagate approximately with their own linear speeds and the speed of the dominative mode. The scheme of successive approximations of nonlinear links between perturbations in the progressive mode is established. The numerical calculations for some kinds of impulses confirm the theory.

  • Non-linear static stability of bi-layer carbon nanosheets resting on an elastic matrix under various types of in-plane shearing loads in thermo-elasticity using nonlocal continuum
    • Mohammad Malikan
    • Mehrdad Jabbarzadeh
    • Shahriar Dastjerdi
    2017 Full text MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS

    In this research, the shear and thermal buckling of bi-layer rectangular orthotropic carbon nanosheets embedded on an elastic matrix using the nonlocal elasticity theory and non-linear strains of Von-Karman was studied. The bi-layer carbon sheets were modeled as a double-layered plate, and van der Waals forces between layers were considered. The governing equations and boundary conditions were obtained using the first order shear deformation theory. For calculation of critical temperature and critical shear load, the equations were divided for two states via adjacent equilibrium criterion, pre-buckling and stability. The stability equations were discretized by differential quadrature method which is a high accurate numerical method. The equations were solved for various boundary conditions, such as free edges. Finally, the small scale parameter effect due to length to the width ratio, stiffness of elastic medium on the critical load was considered. The shear buckling results showed that the effect of type of shear loading on the nonlocal results is more than local results. Also, in thermal buckling analysis, the most important results being that whether the boundary conditions have more flexibility, by increasing the dimensions ratio, the results of critical temperature were tightly close together in nonlocal and local analysis.

  • Nonlinear Viscoelastic Properties of Polyurethane Nanocomposites
    • Michał Strankowski
    2017

    In recent years, the nonlinear viscoelastic behaviors of elastomeric nanocomposites have been examined, especially for a wide range of rubbery composite (including natural rubber) materials. This chapter describes the influence of fillers and nanofillers on the nonlinear viscoelastic properties of elastomeric polyurethane systems. These filled elastomers (similar to the classic natural rubber reinforced elastomers), also exhibit nonlinear behavior called the Payne effect. The complexity of the polyurethane elastomers, where soft (SS) and hard (HS) segments are present in this matrix, cause entanglement between polymer and filler. Moreover, type, size, and geometry of the nanofiller strongly depend on the place of the dispersion into relevant segments, and powerfully influence the properties of the whole nanocomposite system. This chapter also briefly summarizes various types of techniques generally used to characterize nonlinear viscoelastic properties of polymeric materials.

  • Normatywne systemy zarządzania w podmiotach leczniczych na przykładzie województwa pomorskiego
    • Piotr Grudowski
    • Mateusz Muchlado
    2017

    Podmioty lecznicze ze względu na swój szczególny obszar działania jakim jest ochrona zdrowia, powinny minimalizować ryzyka, które to mogą wpłynąć negatywnie na ich działania. Jednym ze sposobów zmniejszenia ryzyka występowania błędów w obszarze zarządzania jest niewątpliwie wdrożenie oraz aktywne wykorzystanie normatywnych systemów zarządzania. Celem autorów niniejszego artykułu było przedstawienie charakterystyki wykorzystania normatywnych systemów zarządzania przez podmioty lecznicze w województwie pomorskim. Na tej podstawie możliwe będzie określenie ewentualnej lokalnej strategii wspierającej pozytywne trendy w rozpatrywanym obszarze. Autorzy przeprowadzili analizę danych publikowanych w Rejestrze działalności podmiotów wykonujących działalność leczniczą pod kątem wykorzystania przez nich normatywnych systemów zarządzania. Analiza dotyczyła rodzaju zaimplementowanych rozwiązań oraz wykorzystania ich w prowadzonej działalności.

  • Nośność kotew wklejanych w elementy wapienno-piaskowe drążone pionowo
    • Maciej Niedostatkiewicz
    2017 Izolacje

    W artykule przedstawiono wyniki pomiarów skuteczności montażu kotew wklejanych osadzonych w drążonych pionowo blokach wapienno - piaskowych. Badania wykonano dla przypadków montażu kotew w różnych fragmentach bloków: w części pełnościennej, w osi symetrii oraz na krawędzi otworu pionowego. Przebadano wpływ lokalizacji miejsc osadzenia kotew na sposób kształtowania się połączenia między żywicą a materiałem bloku. Główny nacisk położono na określenie wpływu lokalizacji montażu na nośność kotew

  • Nośność podłoża gruntowego w projektowaniu konstrukcji nawierzchni Grupy nośności podłoża
    • Jacek Alenowicz
    • Bohdan Dołżycki
    • Piotr Jaskuła
    2017 Magazyn Autostrady

    W artykule opisano różnice między podłożem gruntowym budowli ziemnej i podłożem gruntowym konstrukcji nawierzchni. Skupiono się na stosowanym w Polsce, w katalogach typowych konstrukcji nawierzchni, pojęciu „grupa nośności podłoża”, w kontekście zmian w Rozporządzeniu Ministra Transportu i Gospodarki Wodnej w sprawie warunków technicznych jakim powinny odpowiadać drogi publiczne i ich usytuowanie oraz w kontekście wprowadzenia Eurokodu 7.

  • Novel 2-(2-alkylthiobenzenesulfonyl)-3-(phenylprop-2-ynylideneamino)guanidine derivatives as potent anticancer agents – Synthesis, molecular structure, QSAR studies and metabolic stability
    • Aneta Pogorzelska
    • Jarosław Sławiński
    • Beata Żołnowska
    • Krzysztof Szafrański
    • Anna Kawiak
    • Jarosław Chojnacki
    • Szymon Ulenberg
    • Joanna Zielińska
    • Tomasz Bączek
    2017 Full text EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY

    A series of new 2-(2-alkylthiobenzenesulfonyl)-3-(phenylprop-2-ynylideneamino)guanidine derivatives have been synthesized and evaluated in vitro by MTT assays for their antiproliferative activity against cell lines of colon cancer HCT-116, cervical cancer HeLa and breast cancer MCF-7. The obtained results indicated that these compounds display prominent cytotoxic effect. The best anticancer properties have been observed for derivatives 44 (IC<sub>50</sub> = 6-18 uM) and 45 (IC<sub>50</sub> = 8-14 &mu;M). Very good results of antiproliferative assays have been also shown for compounds 26, 36, and 46 and noticeable anticancer profile has been found for set of derivatives 34e39. Based on results of MTT assays the structure-activity relationships have been drawn. More in-depth biological research revealed that compounds 26, 33, 37, 39, 41 and 43 display cytotoxic effect only against cancer cells and do not inhibit the growth of nonmalignant HaCaT cells. Furthermore, the novel series of derivatives have shown good metabolic stability, especially among the pharmacologically active compounds. To obtain a deeper insight into the molecular description of compounds activity the QSAR studies have been applied. Support vector machines (SVM) have been used to developed QSAR models for predicting the anti-proliferative activity of novel derivatives. The obtained SVM models have shown prognostic ability for HCT-116 and HeLa cell lines and as a result these models may be useful for further development of structurally similar derivatives with better biological properties.

  • Novel Adaptive Method for Data Streams Allocation Based on the Estimate of Radio Channel Parameters in Heterogeneous WBAN Network
    • Krzysztof Cwalina
    • Sławomir Ambroziak
    • Jacek Stefański
    • Jarosław Sadowski
    2017

    The new adaptive method for data streams allocation in heterogeneous Wireless Body Area Networks and meas-urement equipment is presented. The results obtained using the developed method compared with the selected algorithms likely to be used in those networks. The pro-posed adaptive data streams allocation method based on radio channel parameters makes it even twice as efficient to use in terms of resources usage in a WBAN heterogeneous network in relation to the fixed bitrates and use of known algorithms. Efficient use of available resource increase has been shown regardless of the montage location of the mo-bile node on the human body. Implementation of proposed algorithm allows to reduce network data delay and the effective data transmission time, thus saving energy from the power source.