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Gdańsk University of Technology

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Publications from the year 2014

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  • Call Processing Performance in a Multidomain IMS/NGN with Asymmetric Traffic
    • Sylwester Kaczmarek
    • Maciej Sac
    2014

    In this paper we continue our research using the previously proposed analytical traffic model of a multidomain Next Generation Network (NGN), which is standardized for delivering multimedia services based on the IP Multimedia Subsystem (IMS). The aim of the model is to assess mean Call Set-up Delay (CSD) and mean Call Disengagement Delay (CDD), which are standardized call processing performance parameters. The output variables of the model are calculated for various types of intra- and inter-operator calls, taking into account a large set of network parameters large set and terminal registrations, which additionally load the network. To complete the previous research, in which the same parameters of the elements and traffic levels in both IMS/NGN domains (symmetric case) were assumed, in this paper asymmetric cases are investigated, in which selected parameters in one domain are different than in the other one. This allows to indicate the relations between parameters of one domain as well as mean CSD and mean CDD for calls originated in both domains.

  • Can Communication Power of Separable Correlations Exceed That of Entanglement Resource?
    • Paweł Horodecki
    • Jan Tuziemski
    • Paweł Mazurek
    • Ryszard Horodecki
    2014 PHYSICAL REVIEW LETTERS

    The scenario of remote state preparation with a shared correlated quantum state and one bit of forward communication [B. Dakić et al., Nat. Phys. 8, 666 (2012)] is considered. Optimization of the transmission efficiency is extended to include general encoding and decoding strategies. The importance of the use of linear fidelity is recognized. It is shown that separable states cannot exceed the efficiency of entangled states by means of “local operations plus classical communication” actions limited to 1 bit of forward communication. It is proven however that such a surprising phenomena may naturally occur when the decoding agent has limited resources in the sense that either (i) has to use decoding which is insensitive to the change of the coordinate system in the plane in question (which is the natural choice if the receiver does not know the latter) or (ii) is forced to use bistochastic operations which may be imposed by physically inconvenient local thermodynamical conditions.

  • Can Evaluation Patterns Enable End Users to Evaluate the Quality of an e-learning System? An Exploratory Study.
    • Carmelo Ardito
    • Rosa Lanzilotti
    • Marcin Sikorski
    • Igor Garnik
    2014

    This paper presents the results of an exploratory study whose main aim is to verify if the Pattern-Based (PB) inspection technique enables end users to perform reliable evaluation of e-learning systems in real work-related settings. The study involved 13 Polish and Italian participants, who did not have an HCI background, but used e-learning platforms for didactic and/or administrative purposes. The study revealed that the participants were able to effectively and efficiently apply the PB inspection technique with minimum effort. However, in some cases, participants complained that, in some cases, the technique appeared time demanding. This work provides some valuable suggestions to redesign the evaluation tools of the PB technique, in order to improve the focus on specific elements of the e-learning system and to streamline better the evaluation process.

  • Can Grand Design Doctrines Go Well with Locally Reinvented Urbanisms? Notes from Polish Cities in Transition
    • Łukasz Pancewicz
    2014

    The text explores how New Urbanism ideas, a comprehensive global design doctrine, transgress into the context of Polish planning practice. New Urbanism is considered through the perspective of the decentralization of a discussion on a planning policy and a modernization of a State, resulting form its post-Socialist urban change. In the text, New Urbanism is understood as a neotraditionalist movement i.e. drawing from the pre-modernist ideas of the evolutionary growth of the city, "retelling" and merging multiple, historical European urban narratives. It is therefore theorized how a successful large scale application of the movement would depend on its local contextualization of such ideas and how the recent shift in a general debate on Polish urban policy could become an opportunity to implement such a process.

  • Capillary Electrophoresis in Determination of Low Molecular Mass Organic Acids
    • Marta Wasielewska
    • Anna Banel
    • Bogdan Zygmunt
    2014 Full text International Journal of Environmental Science and Development

    This paper presents overviews the capabilities of capillary electrophoretic techniques to determine low molecular mass organic acids in a variety of aqueous, gas and solid samples. It mainly focuses on short - chain carboxylic acids containing one or more carboxylic groups and possibly some other functional groups (hydroxyl, keto-, amino- etc.). Finally the procedures applied to the determine the acids in different matrices are shortly characterized. The principles of capillary electrophoresis its advantages over gas and liquid chromatographic separation and detection modes are briefly discussed. Finally, the brief overview of the technique is followed by characterization of CE based procedures for the analysis of a variety of samples such as food, environmental, biological etc. for the content of organic acids, mainly those with carboxylic groups.

  • Capillary gas chromatography using a -cyclodextrin forenantiomeric separation of methylamphetamine, its precursors andchloro intermediates after optimization of the derivatization reaction
    • Justyna Płotka-Wasylka
    • Vasil Simeonov
    • Calum Morrison
    • Marek Biziuk
    • Jacek Namieśnik
    2014 JOURNAL OF CHROMATOGRAPHY A

    tThe enantiomeric ratio of methylamphetamine (MAMP) is closely related to the optical activity of precur-sors and reagents used for the synthesis and this knowledge can provide useful information concerningthe origins and synthetic methods used for illicit manufacture. The information can be utilized for reg-ulation of the precursors and investigation of the manufacturing sources but this requires analyticalprocedures to determine purity of drug substances, impurity profiling and enantiomeric composition.In this study, a gas chromatography (GC) coupled with mass spectrometry (MS) method using a -cyclodextrin chiral stationary phase was developed and optimized for the simultaneous enantiomericseparations of MAMP and its common precursors, ephedrine, and pseudoephedrine, as well as itschlorointermediates formed during MAMP synthesis by the Emde method, after derivatization with triflu-oroacetic anhydride. The optimization was performed using multivariate statistics (cluster analysis andprincipal components analysis) in order to select and compare optimal experimental conditions. Underthe optimized experimental conditions, the calculated calibration curves showed good linearity range upto 0.1 g/mL for all tested analytes. The limits of detection were in the range of 0.002–0.008 g/mL andthe coefficient of variability was between 1.0 and 3.9%. The method has the advantage of achieving excel-lent precision under repeatability and reproducibility conditions while detection by MS allows for theidentity of analytes to be confirmed in a single analysis. The method was therefore applied satisfactoryto MAMP analysis.

  • Carbon dioxide potential reduction using Start-Stop system in a car
    • Jacek Kropiwnicki
    • Zbigniew Kneba
    2014 Key Engineering Materials

    Operating fuel consumption increases significantly when the vehicle stops frequently while driving or when the engine is idling during braking. In such cases, the internal combustion engine consumes the fuel but the mechanical energy is not used by the drive system. The amount of fuel that is consumed in this time by the engine can potentially be saved if the car is equipped with a Stop-Start system. Start-Stop system automatically shuts down and restarts the internal combustion engine due to strategy used by controller reducing this way toxic compounds emissions in exhaust gasses and the fuel consumption, which is directly connected to carbon dioxide (CO2) emissions. The paper presents an analysis of the potential reduction in CO2 emissions for selected vehicles with Start-Stop system during operation in selected urban agglomeration using different strategies to control this system. The study was carried out using numerical models of propulsion systems. The results were compared with the statistical data derived from regular use of vehicles equipped with such a system.

  • Carbon dioxide sequestration during shale gas recovery
    • Andrzej Rogala
    • Katarzyna Księżniak
    • Jan Hupka
    2014 Full text Physicochemical Problems of Mineral Processing

    This paper presents literature on theoretical and practical aspects of gas production from shale using carbon dioxide fracturing. Development of technical and environmental aspects of carbon dioxide fracturing technologies is also considered. Patents applicable to carbon dioxide fracturing are reviewed. There were also conducted researches to evaluate possibility of carbon dioxide sequestration in shale gas reservoirs.

  • Carbonic anhydrase inhibitors. Synthesis, and molecular structure of novel series N-substituted N'-(2-arylmethylthio-4-chloro-5- methylbenzenesulfonyl)guanidines and their inhibition of human cytosolic isozymes I and II and the transmembrane tumor-associated isozymes IX and XII
    • Beata Żołnowska
    • Jarosław Sławiński
    • Aneta Pogorzelska
    • Jarosław Chojnacki
    • Daniela Vullo
    • Claudiu T. Supuran
    2014 Full text EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY

    A series of novel N-substituted N'-(2-arylmethylthio-4-chloro-5-methylbenzenesulfonyl)guanidines 9 e41 have been synthesized and investigated as inhibitors of four isoforms of zinc enzyme carbonic anhydrase (CA.EC 4.2.1.1), that is the cytosolic CA I and II, and cancer-associated isozymes CA IX and XII. Against the human CA I investigated compounds showed KI in the range of 87e6506 nM, toward hCA II ranging from 7.8 to 4500 nM, against hCA IX in the range of 4.7e416 nM and against hCA XII at range of 0.96e540 nM. Compounds 10, 12e14, 16, 18e20, 24e26, 31 and 32 exhibited a powerful inhibitory potency toward hCA IX (KI ¼ 4.7e21 nM) in comparison to the reference sulfonamides AAZ, MZA, EZA, DCP and IND (KI ¼ 24e50 nM). Compound 14 was the most potent inhibitor of hCA I (KI ¼ 87 nM), hCA IX (KI ¼ 4.7 nM) and hCA XII (KI ¼ 0.96 nM), while 26 was the most effective inhibitor of hCA II (KI ¼ 7.8 nM). The most promising compound 32 exerted the highest selectivity ratios toward hCA IX versus hCA I (hCA I/hCA IX ¼ 261) and hCA II (hCA II/hCA IX ¼ 26). The in vitro antitumor activity of compounds 10, 13, 14, 21, 22, 25, 32, 38 and 41 was evaluated at the US National Cancer Institute (NCI) against a panel of 60 human tumor cell lines. The most active antitumor agents 21 and 25, inhibiting 32e35 human tumor cell lines with GI50 in the range of 2.1e5.0 mM also showed relatively high inhibitory activity toward hCA IX and XII with KI from 18 to 40 nM.

  • Case studies of resonance phenomena in high voltage overhead power lines with shunt reactors
    • Stanisław Czapp
    • Krzysztof Dobrzyński
    • Jacek Klucznik
    • Robert Kowalak
    • Zbigniew Lubośny
    • Robert Małkowski
    2014

    Misguided design of the towers of power transmission lines can lead to serious problems such as voltage asymmetry, overvoltages, electric arc extinction difficulties or resonance – in case of double circuit line with shunt reactors. The paper points out those threats on example of 400 kV double circuit overhead transmission line with shunt reactors.

  • Case study methodology. Few conceptual considerations.
    • Ewa Lechman
    2014 Full text Przedsiębiorstwo we współczesnej gospodarce - teoria i praktyka

    This paper contributes to the debate on case study as methodological approach. It shows several issues concerning its major advatangeus and disadvantageus

  • cDNA fingerprint from the hepatopancreatic glands of pond snails (Lymnaea stagnalis) exposed to benzo[a]pyrene
    • Maciej Woźny
    • Przemysław Kowal
    • Sławomir Ciesielski
    • Florczyk Maciej
    • Rafał Wiśniewski
    • Ewelina Malicka
    • Paweł Brzuzan
    2014 Full text Environmental Biotechnology

    Identification of differentially expressed genes that could be potentially used as biomarkers of PAH exposure of common invertebrate animal (like freshwater snail) would be a valuable resource for investigators interested in toxicology and biomonitoring of aquatic environments. Therefore, the aim of this research was to investigate effects of waterborne benzo[a]pyrene (B[a]P) exposure on mRNA expression in the pond snail’s (Lymnaea stagnalis) hepatopancreatic gland. Toward this end, mature individuals of pond snail (L. stagnalis) were treated with 50µM B[a]P solution in a short 36h static exposure test. Differential Display PCR (DD-PCR) was used to generate a unique cDNA fingerprint of genes that were differentially expressed in the tissues of exposed and unexposed snails. To assess the putative identity of the isolated cDNA amplicons (ESTs), BLAST queries were performed to find similarities in their nucleotide sequence. Real-Time qPCR analysis was used to verify the DD-PCR expression profile. Finally, an additional independent exposure study, including higher dose of B[a]P (100µM), was conducted to validate the expression of selected ESTs. BLAST revealed that only 3 out of 9 isolated ESTs had meaningful information on their putative nucleotide sequence identity. The highest similarity was scored for EST-A1, identified as the transcript of UAP-like protein, found to be up-regulated after B[a]P exposure. The original expression pattern that was observed in DD-PCR step was coherent with results of the qPCR verification for 3 out of 5 analyzed ESTs. However, changes in the ESTs expression were modest and the treatment with B[a]P resulted in significant down-regulation for only 1 unidentified fragment (EST-G42, almost 2-fold; p<0.05) when compared to untreated snails. Although no significant changes were observed for EST-A1 and EST-G42 in the validation study, their expression pattern was consistent with that obtained from DD-PCR. Surprisingly, EST-C5 remained in contrast to the DD-PCR part, but it showed significant down-regulation in group of snails exposed to 100µM B[a]P (3.5-fold; p<0.05). The obtained results show that diverse genes may be involved in the molecular response of the pond snail’s hepatopancreas to treatment with B[a]P. However, further research is needed to confirm the utility of the discovered EST as PAH biomarkers in biomonitoring practices with L. stagnalis as bioindicator species.

  • CeCu2O4 as a functional layer on solid oxide fuel cells for synthetic biogas reforming
    • Dagmara Grudzień
    • Aleksander Chrzan
    • Piotr Jasiński
    2014

    Solid Oxide Fuel Cells (SOFC) are one of the most promising electrochemical devices, which can convert chemical energy to the electrical energy these days. Their ability to work with different kind of fuel makes them noteworthy. SOFC can work with biogas. The problem arises when solid carbon starts to be deposited in anode. That leads to degradation of fuel cell. Simple solution is to apply catalytic functional layer, which is able to reduce carbon deposition by internal reforming of biogas. In this paper CeCu2O4 as a catalytic layer, due to its high catalytic activity, was chosen. Two different ways of CeCu2O4 deposition are investigated – from solution and from paste. The obtained results were compared with an unmodified cell.

  • Center for Scientific and Technical Information - Library Services for Business and Science at Wroclaw University of Technology
    • Anna Wałek
    2014 Full text

    Wroclaw University of Technology is situated in Lower Silesia – the dynamically developing region of Poland. Focusing on adopting its own offer to the market needs had been selected as a strategy. Due to that, a synergy effect has been achieved with the development of segments strategic for the region. The University is strongly oriented to cooperation with the economy and industry. One of the key initiatives was establishment within the University structure the Center for Scientific and Technical Information on January 1, 2014. This is the unit responsible for collecting and providing scientific and technical information for the needs of performing scientific research and supporting didactics, as well as coordinating cooperation with the economy and technology transfer. Within the structure of the Center, the Traditional and Electronic Libraries were established, providing the library-information services and creating also the digital library, knowledge repository and the data base for scientific achievements. Besides the library resources, data bases and electronic periodicals, the Center makes available the patent and standardizing information, as well as the information on new technologies both, for the needs of scientific society and industry representatives. Tasks of the Center involve, among others, also collecting knowledge on technologies developed at the University, conducted projects, available scientific equipment and informing on opportunities for commercialization of the research results. In the paper, the genesis of formation of the Center for Scientific and Technical Information and its basic tasks directed in particular at cooperation of science with economy and industry have been presented. Changes in the library and information system of the University and establishment of the Center reveal the new role of libraries and centers of scientific and technical information.

  • Ceria Based Protective Coatings for Steel Interconnects Prepared by Spray Pyrolysis
    • Dagmara Grudzień
    • Ming Chen
    • Sebastian Molin
    • Peter vang Hendriksen
    • Piotr Jasiński
    2014 Full text Procedia Engineering

    Stainless steels can be used in solid oxide fuel/electrolysis stacks as interconnects. For successful long term operation they require protective coatings, that lower the corrosion rate and block chemical reactions between the interconnect and adjacent layers of the oxygen or the hydrogen electrode. One of the promising coating materials for the hydrogen side is ceria. Using standard sintering techniques, ceria sinters at around 1400°C which even for a very short exposure would destroy the interconnect. Therefore in this paper a low temperature deposition method, i.e. spray pyrolysis, is used to deposit thin (~400 nm), continuous CeO2 layers on Crofer 22 APU steel substrates. Influence of the deposition parameters on layer quality is elucidated in this work.

  • CFD and FEM model of an underwater vehicle propeller
    • Tadeusz Chruściel
    • Ewelina Ciba
    • Julita Dopke
    2014 Full text Polish Maritime Research

    During the project execution of design and optimization the Remotely Operated Vehicle (ROV) research on its propulsion has been carried out. The entire project was supported by CFD and FEM calculations, which taking into account the characteristics of underwater vehicle. One of the tasks was to optimize the semi-open duct for horizontal propellers, which provided propulsion and controllability in horizontal plane. In order to create a measurable model of this task it was necessary to analyze numerical methodology of propeller design, propellerwith nozzle and contrarotating propellers. It was confronted with theoretical solutions which include running of analyzed propeller near underwater vehicle. Also a preliminary qualitative analysis of simplified system which included contrarotating propellers and semi-open duct were carried out. It enabled to proceed with design decision about ROVs duct form. Rapid prototyping SLS (Selective Laser Sintering)method was used to fabrication physical model of the propeller. As a consequence of this, it was necessary to verify the FEM model of the propeller, which based on the load obtained from the CFD model. The publication contains characteristic of ROV, theoretical base of propeller design for analyzed cases and results of CFD and FEM simulation.

  • Challenges in providing support for management of evidence-based arguments
    • Janusz Górski
    • Aleksander Jarzębowicz
    • Jakub Miler
    • Andrzej Wardziński
    2014

    The paper considers selected challenges related to the application of evidence based arguments and maps them on the tool support level. In particular, we consider: communication and teamwork, handling large arguments, evidence management and integration, argument assessment and communication, change control and reporting, evidence reuse, user data security and argument portfolio management. Then we explain how these challenges have been responded to in NOR-STA, a tool supporting applications of evidence based arguments. The paper is based on our experience with applying NOR-STA to support conformance cases and assurance cases in more than 120 organizations.

  • Changing patterns in export of goods versus international competitiveness. A comparative analysis for Central-East European countries in the period 2000-2011.
    • Ewa Lechman
    2014 Full text COMPARATIVE ECONOMIC RESEARCH. CENTRAL AND EASTERN EUROPE

    This paper discusses the existing links between changing patterns in the export of goods, broken down by technology-intensity, versus intrenational competitiveness. The study covers nine Central-East European (CEE) economies: Bulgaria, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Romania and the Slovak Republic, in the time span 2000-2011. We examine the hypothesis of a strong, positive and statistically significant relationship between flows of export of high-tech and ICT manufactures industries goods, and an economy’s level of international competitiveness (approximated by the Global Competitiveness Index – GCI, see: World Economic Forum). Our methodological approach relies on elaboration of each country`s individual export patterns with regard to industries of different technology-intensities, and statistical analysis between the international GCI variable and variables identifying shares in total export of certain industries. Contrary to what was initially expected, our empirical results do not seem to support the hypothesis on statistically positive links between growing shares of high-tech and ICT manufactures industries in the total value of export versus the Global Competitiveness Index in the analyzed countries.

  • Characteristics of Propagation Conditions in the Container Terminal Environment
    • Sławomir Ambroziak
    • Ryszard Katulski
    2014

    In the paper a characteristics of propagation conditions in the container terminal environment is presented. The investigated environment is characterized on the example of Gdansk Deepwater Container Terminal in Poland. An empirical propagation model for path loss calculation in mobile radio links in a container terminal environment is presented.

  • Characteristics of volatile organic compounds emission profiles from hot road bitumens
    • Grzegorz Boczkaj
    • Andrzej Przyjazny
    • Marian Antoni Kamiński
    2014 CHEMOSPHERE

    A procedure for the investigation and comparison of volatile organic compounds (VOCs) emission profiles to the atmosphere from road bitumens with various degrees of oxidation is proposed. The procedure makes use of headspace analysis and gas chromatography with universal as well as selective detection, including gas chromatography–mass spectrometry (GC–MS). The studies revealed that so-called vacuum residue, which is the main component of the charge, contains variable VOC concentrations, from trace to relatively high ones, depending on the extent of thermal cracking in the boiler of the vacuum distillation column. The VOC content in the oxidation product, so-called oxidized paving bitumen, is similarly varied. There are major differences in VOC emission profiles between vacuum residue and oxidized bitumens undergoing thermal cracking. The VOC content in oxidized bitumens, which did not undergo thermal cracking, increases with the degree of oxidation of bitumens. The studies revealed that the total VOC content increases from about 120 ppm for the raw vacuum residue to about 1900 ppm for so-called bitumen 35/50. The amount of volatile sulfur compounds (VSCs) in the volatile fraction of fumes of oxidized bitumens increases with the degree of oxidation of bitumen and constitutes from 0.34% to 3.66% (w/w). The contribution of volatile nitrogen compounds (VNCs) to total VOC content remains constant for the investigated types of bitumens (from 0.16 to 0.28% (w/w) of total VOCs). The results of these studies can also find use during the selection of appropriate bitumen additives to minimize their malodorousness. The obtained data append the existing knowledge on VOC emission from oxidized bitumens. They should be included in reports on the environmental impact of facilities in which hot bitumen binders are used.