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Gdańsk University of Technology

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Publications from the year 2015

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  • Nano-particle doped hydroxyapatite material evaluation using Spectroscopic Polarization Sensitive Optical Coherence Tomography
    • Paulina Strąkowska
    • Michał Trojanowski
    • Mateusz Gardas
    • Maciej Głowacki
    • Maciej Kraszewski
    • Marcin Strąkowski
    2015

    Bio-ceramics such as hydroxyapatite (HAp) are widely used materials in medical applications, especially as an interface between implants and living tissues. There are many ways of creating structures from HAp like electrochemical assisted deposition, biomimetic, electrophoresis, pulsed laser deposition or sol-gel processing. Our research is based on analyzing the parameters of the sol-gel method for creating thin layers of HAp. In order to achieve this, we propose to use Optical Coherence Tomography (OCT) for non-destructive and non-invasive evaluation. Our system works in the IR spectrum range, which is helpful due to the wide range of nanocomposites being opaque in the VIS range. In order to use our method we need to measure two samples, one which is a reference HAp solution and second: a similar HAp solution with nanoparticles introduced inside. We use silver nanoparticles below 300 nm. The aim of this research is to analyze the concentration and dispersion of nanodopants in the bio-ceramic matrix. Furthermore, the quality of the HAp coating and deposition process repetition have been monitored. For this purpose the polarization sensitive OCT with additional spectroscopic analysis is being investigated. Despite the other methods, which are suitable for nanocomposite materials evaluation, the OCT with additional features seems to be one of the few which belong to the NDE/NDT group. Here we are presenting the OCT system for evaluation of the HAp with nano-particles, as well as HAp manufacturing process. A brief discussion on the usefulness of OCT for bio-ceramics materials examination is also being presented.

  • Nano-structured Pt embedded in acidic salts of heteropolymolybdate matrices: MS EXAFS study
    • Agnieszka Witkowska
    • Sonia Dsoke
    • Roberto Marassi
    • Andrea DiCicco
    2015 NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

    A structural study of Pt nano-catalysts is presented in the paper. The innovation in the case of the considered catalytic materials resides in the use a meso-microporous inorganic matrix of heteropolyacid salt of composition X2.5H0.5YMo12O40 where X = Rb, Cs and Y = P, Si as a catalyst support. Metallic nanoparticles were created by platinum ions reduction in a hot H2/Argon stream and were mainly located into matrix pores. As the porous structure can be controlled by the type and content of the cation used, the desired/optimal Pt nanoparticle size can be precisely defined by using a proper heteropolyacid salt composition. Multiple-scattering extended X-ray absorption fine structure (MS EXAFS) analysis was applied to obtain the relation between the matrix composition and the size of the catalyst nanoparticles. The results showed that it was only the secondary structure form of the heteropolymolybdate salt (i.e. Rb or Cs cations) that influenced the metallic nanoparticle size. The smaller the X atom ionic radii, the larger the mean diameter of the embedded Pt nanoparticles.

  • Narodowe Forum Muzyki
    • Monika Arczyńska
    2015

    Tekst o Narodowym Forum Muzyki we Wrocławiu

  • Narzędzia zarządzania operacyjnego w działaniach kryzysowych przedsiebiorstw
    • Grzegorz Zieliński
    • Anna Zielińska
    2015

    W niniejszym opracowaniu zaprezentowano podstawowe aspekty związane z wykorzystaniem narzędzi zarzadzania operacyjnego w przedsiębiorstwach. Autorzy odnieśli się do w tym przypadku do podejmowanych przez podmioty działań kryzysowych. Tego typu podejście stanowić może interesujące połączenie obszarów zarządzania co w dalszej konsekwencji może mieć wpływ na zwiększenie efektywności podejmowanych działań

  • National Music Forum
    • Monika Arczyńska
    2015

    Text on National Music Forum in Wroclaw.

  • Natural architectural design
    • Joseph Grima
    • Aaron Casha
    • Jarosław Rybicki
    2015

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  • Nauczanie Chemii Analitycznej w Polsce
    • Marek Biziuk
    2015 Orbital

    Komisja Nauczania Komitetu Chemii Analitycznej PAN przeprowadziła ankietę dotyczącą stanu nauczania Chemii Analitycznej na wyższych uczelniach w Polsce. Otrzymaliśmy wypełnione ankiety z 32 ośrodków, w tym ze wszystkich największych uniwersytetów oraz politechnik. Ankiety te dały podstawę do opracowania obszernego raportu o stanie nauczania Chemii Analitycznej na wyższych uczelniach w Polsce. Wśród ujętych w raporcie znalazło się 14 uniwersytetów, 6 uniwersytetów medycznych, 2 uniwersytety przyrodnicze i 10 politechnik. Niniejsza, czwarta część raportu obejmuje ocenę aktywności poszczególnych uczelni w ramach programów międzynarodowych związanych z Chemią Analityczną, w tym: Erasmus, Erasmus-Mundus, CEPUS itp.

  • Nauczanie Chemii Analitycznej w Polsce (II)
    • Marek Biziuk
    2015 Orbital

    W artykule, opracowanym na podstawie ankiet, zestawiono uczelnie, na których prowadzone są przedmioty związane z Chemią Analityczną oraz kadrę dydaktyczną prowadzącą te przedmioty. W artykule, opracowanym na podstawie ankiet, zestwiono uczelnie, na których prowadzone sa przedmioty zwiazane z Chemią Analityczną oraz kadrę dydaktyczną prowadzącą te przedmioty. Przedstawiono również listę książek, podręczników i skryptów opracowanych przez nauczycieli akademickich w polskich uczelniach.

  • Nauczanie Chemii Analitycznej w Polsce (III)
    • Marek Biziuk
    2015 Orbital

    W artykule zestawiono przedmioty prowadzone na polskich uczelniach, związane z Chemią Analityczną oraz wyposażenie laboratoriow analitycznych w poszczególnych uczelniach

  • Nauczanie polityki pieniężnej na studiach wyższych - przykłady rozwiązań
    • Karolina Tura-Gawron
    • Magdalena Szyszko
    2015 Full text STUDIA OECONOMICA POSNANIENSIA

    Jednym ze sposobów efektywnego nauczania polityki pieniężnej na studiach wyższych jest wykorzystanie studium przypadku. W artykule zaproponowano kilka przykładowych, możliwych do realizacji na ćwiczeniach, zadań opartych na tej metodzie. Te ćwiczenia nastawione są na pracę zespołową. Uczą samodzielnego wyciągania wniosków oraz obrazują związki przyczynowo-skutkowe niezbędne do pełnego zrozumienia materiału. Dodatkowo nabyte przez uczniów umiejętności stanowią przyczynek do lepszego zrozumienia źródeł i dokumentów o podłożu analitycznym (w szerokim rozumieniu: dokumentów zawierających analizy modelowane, ale również dane, schematy, wykresy, komentarze) na dalszym etapie nauki oraz szybszego rozwoju kompetencji zawodowych

  • Nauczyciel „profesjonalista – praktyk” jako jeden z wariantów nauczycielskiej tożsamości zawodowej
    • Michał Tomasz Tomczak
    2015 Full text Wychowanie na co dzień

    Głównym problemem podejmowanym w tekście, jest próba badania tożsamości zawodowej nauczycieli w specyficznym ujęciu, w relacji do ich biografii. Materiał empiryczny pozyskano metodą jakościową, w oparciu o technikę narracyjnego wywiadu biograficznego. W rezultacie podjętych czynności badawczych, powstały trzy modele nauczycielskich tożsamości zawodowych, stanowiących o specyfice zawodu nauczyciela. Jeden z nich – model profesjonalisty praktyka, w intencji autora tekstu stanowić może jedną z ewentualnych ścieżek rozwoju profesji nauczycielskiej.

  • Nauki o żywieniu w erze postgenomicznej
    • Joanna Cyprys
    • Magdalena Doraczyńska
    • Agnieszka Bartoszek-Pączkowska
    2015

    brak

  • N-doped mesoporous carbon nanosheets obtained by pyrolysis of a chitosan–melamine mixture for the oxygen reduction reaction in alkaline media.
    • Maria Rybarczyk
    • Marek Lieder
    • Jabłońska Milena
    2015 RSC Advances

    By simple thermal decomposition of low-cost precursors (chitosan, melamine) in an inert atmosphere, nitrogen-doped porous carbonaceous materials were prepared. The samples pyrolyzed at 700 C are composed of mainly mesoporous nitrogen-doped carbon nanosheets and partially graphitized carbon. The nanosheets contain a disordered area due to the strain imposed by the presence of nitrogen and/or oxygen groups in their structure. Some portion of the material is comprised of clean well crystallized graphene sheets. They show an interlayer distance of about 0.359 nm. The average size of the visible well-crystallized carbon is 8 8 nm, covering ca. 4% of the samples flat projection. Further, these materials possess total specific areas up to ca. 285 m2 g1 , and exhibit efficient electrocatalytic activity (the onset potential of 0.735–0.761 V vs. RHE) for the oxygen reduction reaction (ORR) in alkaline media. Our results show that besides the total nitrogen content and the type of nitrogen group (pyridinic or graphitic), also the amount of carbon ‘kinks’ and/or surface roughness strongly influence the ORR activity.

  • Neuronowo Sterowane Agenty w Procesie Zespołowego Zaganiania
    • Michał Romanowski
    • Wojciech Jędruch
    2015

    Przedstawiono rozwiązanie problemu zaganiania na drodze uczenia algorytmami ewolucyjnymi. Neuronowe agenty aktywne na podstawie informacji o położeniach pozostałych agentów aktywnych i biernych poprzez odpowiednie poruszanie się skupiają agenty bierne na możliwie małej powierzchni.

  • New Approach to Arc Fitting for Railway Track Realignment
    • Slawomir Cellmer
    • Jacek Rapiński
    • Marta Skala
    • Katarzyna Palikowska
    2015 JOURNAL OF SURVEYING ENGINEERING-ASCE

    This article presents a new method of arc fitting for railway track realignment. The theoretical foundations are presented, along with a detailed algorithm of the iterative computational process. This method is based on solving a set of linearized pseudo-observation equations. The formulas of the functional model of the fitting problem were derived, and a special form of objective function is proposed. An iterative method for optimization of objective functions is described, and an analysis of the functional model is presented. Specific conclusions are presented based on the results of this analysis.

  • New approaches for improving selectivity and sensitivity of resistive gas sensors: a review
    • Janusz Smulko
    • Maciej Trawka
    • Claes Goran Granqvist
    • Radu Ionescu
    • Fatima E. Annanouch
    • Eduard Llobet
    • Laszlo B. Kish
    2015 Full text Sensor Review

    Purpose – This paper aims to present the methods of improving selectivity and sensitivity of resistance gas sensors. Design/methodology/approach – This paper compares various methods of improving gas sensing by temperature modulation, UV irradiation or fluctuation-enhanced sensing. The authors analyze low-frequency resistance fluctuations in commercial Taguchi gas sensors and the recently developed tungsten trioxide (WO3) gas-sensing layers, exhibiting a photo-catalytic effect. Findings – The efficiency of using low-frequency fluctuations to improve gas detection selectivity and sensitivity was confirmed by numerous experimental studies in commercial and prototype gas sensors. Research limitations/implications – A more advanced measurement setup is required to record noise data but it will reduce the number of gas sensors necessary for identifying the investigated gas mixtures. Practical implications – Fluctuation-enhanced sensing can reduce the energy consumption of gas detection systems and assures better detection results. Originality/value – A thorough comparison of various gas sensing methods in resistance gas sensors is presented and supported by exemplary practical applications.

  • New bulk liquid membrane oscillator composed of two coupled oscillators with diffusion-mediated physical coupling
    • Maria Szpakowska
    • Elzbieta Płocharska-Jankowska
    • B.nagy Otto
    2015 Full text CHEMICAL PAPERS

    A new type of bulk liquid membrane system, which represents the first example of a bulk liquid membrane oscillator characterised by the presence of two coupled oscillators, is described. When the benzyldimethyltetradecylammonium chloride surfactant undergoes an oscillatory mass transfer through a nitromethane liquid membrane, a new liquid layer (phase X) appears between the membrane and the acceptor phase. Kinetic analysis provides evidence that the whole system is composed of two coupled oscillators with diffusion-mediated physical coupling. The first component oscillator (based on nitromethane) of lower frequency delivers the driving material to the second one (phase X-based oscillator) leading to additional higher frequency oscillations. A new molecular mechanism is proposed for interpreting the experimental observations. The results might enhance understanding of intercellular communication in biology, where periodic signalling is more efficient than any other type of signalling mode.

  • New generation of analytical tests based on the assessment of enzymatic and nuclear receptor activity changes induced by environmental pollutants
    • Anna Bejrowska
    • Błażej Kudłak
    • Katarzyna Owczarek
    • Natalia Jatkowska
    • Jacek Namieśnik
    • Zofia Mazerska
    2015 Full text TRAC-TRENDS IN ANALYTICAL CHEMISTRY

    Analytical methods show great potential in biological tests. The analysis of biological response that results from environmental pollutant exposure allows: (i) prediction of the risk of toxic effects and (ii) provision of the background for the development of markers of the toxicants presence. Bioanalytical tests based on changes in enzymatic activity and nuclear receptor action provide extremely high specificity and sensitivity. We describe the application of xenobiotic metabolizing enzymes (i.e., cytochromes P450, glutathione S-transferases, and sulfotransferases), enzymes involved in natural metabolic pathways (i.e., acyltransferases, and N-acetyltransferases), and several other enzymes. We also describe the tests employing changes in nuclear receptor activity, including aryl hydrocarbon receptor, pregnane X receptor, constitutive androstane receptor, and retinoid X receptor, as promising tests allowing the prediction of dangerous effects of environmental pollutants a long time after exposure.

  • New oryginal generic technologies: A Polish R&D strategic implementation programme
    • Janusz Rachoń
    2015 Polish Market

    Polands's pharmaceutical industry is of great significance to the whole economy. According to Forbs (2 October 2012), the cost of launching a new drug varies from USD 1 to 11 bilion. There is little Chance of a Polish pharmaceutical company developing an original drug due to financial reason.Many research teams in Poland take up research projects aimed at new biologically active compounds. But such an objective has no broader perspective, because the Polish pharmaceutical industry lacks sufficient resources for tests and the registration and promotion of the original drug;. Therefore, such projects will remain purely academic. If commercialized, the result may be, at best, selling the patent rights to a large foreign company for a relatively small amount of money. That is why Polish manufacturers reach for cheaper equivalents of original drugs - generics.

  • New potential functions for greedy independence and coloring
    • Piotr Borowiecki
    • Dieter Rautenbach
    2015 Full text DISCRETE APPLIED MATHEMATICS

    A potential function $f_G$ of a finite, simple and undirected graph $G=(V,E)$ is an arbitrary function $f_G : V(G) \rightarrow \mathbb{N}_0$ that assigns a nonnegative integer to every vertex of a graph $G$. In this paper we define the iterative process of computing the step potential function $q_G$ such that $q_G(v)\leq d_G(v)$ for all $v\in V(G)$. We use this function in the development of new Caro-Wei-type and Brooks-type bounds for the independence number $\alpha(G)$ and the Grundy number $\Gamma(G)$. In particular, we prove that $\Gamma(G) \leq Q(G) + 1$, where $Q(G) = \max\{q_G(v)\,\vert\,v\in V(G)\}$ and $\alpha(G) \geq \sum_{v\in V(G)}(q_G(v)+1)^{-1}$. This also establishes new bounds for the number of colors used by the algorithm Greedy and the size of an independent set generated by a suitably modified version of the classical algorithm GreedyMAX.