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Publications Repository
Gdańsk University of Technology

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Publications from the year 2015

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  • Antimicrobial resistance of Pseudomonas spp. isolated from wastewater and wastewater-impacted marine coastal zone
    • Aneta Łuczkiewicz
    • Ewa Kotlarska
    • Wojciech Artichowicz
    • Katarzyna Tarasewicz
    • Sylwia Fudala-Książek
    2015 Full text ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

    In this study, species distribution and antimicrobial susceptibility of cultivated Pseudomonas spp. were studied in influent (INF), effluent (EFF), and marine outfall (MOut) of wastewater treatment plant (WWTP). The susceptibility was tested against 8 antimicrobial classes, active against Pseudomonas spp.: aminoglycosides, carbapenems, broad-spectrum cephalosporins from the 3rd and 4th generation, extended-spectrum penicillins, as well as their combination with the β-lactamase inhibitors, monobactams, fluoroquinolones, and polymyxins. Among identified species, resistance to all antimicrobials but colistin was shown by Pseudomonas putida, the predominant species in all sampling points. In other species, resistance was observed mainly against ceftazidime, ticarcillin, ticarcillin-clavulanate, and aztreonam, although some isolates of Pseudomonas aeruginosa, Pseudomonas fluorescens, Pseudomonas pseudoalcaligenes, and Pseudomonas protegens showed multidrug-resistance (MDR) phenotype. Among P. putida, resistance to β-lactams and to fluoroquinolones as well as multidrug resistance become more prevalent after wastewater treatment, but the resistance rate decreased in marine water samples. Obtained data, however, suggests that Pseudomonas spp. are equipped or are able to acquire a wide range of antibiotic resistance mechanisms, and thus should be monitored as possible source of resistance genes.

  • Antycypacja kryzysu w elementach wejścia do systemu operacyjnego przedsiebiorstw
    • Grzegorz Zieliński
    • Anna Zielińska
    2015 MARKETING I RYNEK

    W niniejszym opracowaniu zaprezentowno kluczowe aspekty antycypacji kryzysu w obszarze zarządzania operacyjnego. autorzy scharakeryzowali zarządzanie antykryzysowe wraz z jego głównymi fazami w odniesieniu do kilku modeli zarządzania antykryzysowego. Jedna z tych faz jest faza antycypacji, która jest niezwykle istotna z punktu widzenia obszaru zarządzania operacyjnego zarówno w sektorze produkcyjnym jak i usługowym. W niniejszej publikacji zaprezentowano równiez badania empiryczne związane z antycypacja kryzysu w odniesieniu do elementów składowych obszaru wejścia do systemu operacyjnego

  • Appendix E
    • Marcin Morawiec
    2015

    The advance of variable speed drives systems (VSDs) engineering highlights the need of specific technical guidance provision by electrical machines and drives manufacturers, so that such applications can be properly designed to present advantages in terms of both energy efficiency and expenditure. This book presents problems and solutions related to inverter-fed electrical motors. Practically orientated, the book describes the reasons, theory and analysis of those problems. Various solutions for individual problems are presented together with the complete design process, modelling and simulation examples with MATLAB/Simulink on the companion website. A key focus of Variable Speed AC Drives with Inverter Output Filters is to examine the state variables estimation and motor control structures which have to be modified according to the used solution (filter). In most control systems the structure and parameters are taken into account to make it possible for precise control of the motor. This methodology is able to include modifications and extensions depending on specific control and estimation structures.

  • Application Isssues of the Semi-Markov Reliability Model
    • Jacek Rudnicki
    2015 Full text Polish Maritime Research

    Predicting the reliability of marine internal combustion engines, for instance, is of particular importance, as it makes it possible to predict their future reliability states based on the information on the past states. Correct reliability prediction is a complex process which consists in processing empirical results obtained from operating practice, complemented by analytical considerations. The process of technical state changes of each mechanical device is stochastic and continuous in states and time, hence the need to divide this infinite set of engine states into a finite number of subsets (classes), which can be clearly and permanently identified using the existing diagnosing system. Using the engine piston-crankshaft system as an example, the article presents a proposal for a mathematical model of reliability which, on the one hand, takes into account random nature of phenomena leading to the damage, and at the same time reveals certain application flexibility and the resultant practical usability.

  • Application of acoustic emission for detection of fatigue microdemage in main and crank bearings for diesel engines
    • Jerzy Girtler
    2015 Full text Journal of Polish CIMEEAC

    The article presents reasons for applying the acoustic emission (AE) to detect fatigue microdamage in main bearings and crank bearings of ship main engines. Problem of determination of the fatigue life for slide bearing bushes was characterized in general. There were demonstrated properties of the objects of research, which were bushings made of the MB58 alloy, as well as an overall description of the research. It was shown that the frequency bands of AE signals can indicate fatigue damage to the sliding layer of a bearing bush. The fatigue damage in the tested bushes was depicted in figures. General features of the AMSY-6 measuring system, used in the research, were also provided herein.

  • Application of auto calibration and linearization algorithms to improve sound quality of computer devices
    • Józef Kotus
    2015

    An application of auto calibration and linearization algorithms designed for correcting acoustic characteristics of selected computer devices was presented in the paper. The functionality of the algorithms were presented for two kind of computer devices: ultrabook class computer and portable device of All-In-One type. The algorithms were adjusted for the given type of the device on the basis of series of measurements conducted on several samples of such type of devices. The key details of the algorithms were presented and illustrated by a practical implementation. The essential improvement of the shape of the amplitude characteristic of loudspeakers built in the devices was confirmed by objective measurements. The presented methodology can also be applied for correction of the acoustic path of other kind of mobile devices.

  • Application of bioassays in studies on the impact of pharmaceuticals on the environment
    • Monika Wieczerzak
    • Błażej Kudłak
    • Jacek Namieśnik
    2015

    Drug interactions are often desirable particularly in medicine, when treatment of a patient requires using a mixture of drugs in specific doses to produce the adequate therapeutic effect. Unfortunately, interactions between drugs in the environment are not as desirable, despite the fact that drugs are present in the environment at low concentration levels [1]. Pharmaceuticals are present in the environment in a mixture of compounds, which are not inert towards each other, may contribute to the increase (phenomenon of synergism) or decrease (phenomenon of antagonism) of overall toxicity [2]. Pharmaceuticals namely: diclofenac (sodium salt), oxyteracycline hydrochloride, fluoxetine hydrochloride and chloramphenicol, were mixed with each other at different ratios of EC50 and tested using MICROTOX®. Results obtained show the highest toxicity exhibited by mixtures containing diclofenac.

  • Application of Bladder Acellular Matrix in Urinary Bladder Regeneration: The State of the Art and Future Directions
    • Marta Pokrywczyńska
    • Iga Gubańska
    • Gerard Drewa
    • Tomasz Drewa
    2015 Full text JOURNAL OF BIOMEDICINE AND BIOTECHNOLOGY

    Construction of the urinary bladder de novo using tissue engineering technologies is the “holy grail” of reconstructive urology. The search for the ideal biomaterial for urinary bladder reconstruction has been ongoing for decades. One of the most promising biomaterials for this purpose seems to be bladder acellular matrix (BAM). In this review we determine the most important factors, which may affect biological and physical properties of BAM and its regeneration potential in tissue engineered urinary bladder. We also point out the directions in modification of BAM, which include incorporation of exogenous growth factors into the BAM structure. Finally, we discuss the results of the urinary bladder regeneration with cell seeded BAM.

  • Application of design-thinking models to improve the quality of tourism services
    • Grzegorz Zieliński
    • Malwina Studzińska
    2015 Zarządzanie i Finanse

    The paper presents basic aspects of improvement activities for the quality of tourism industry service through its specific determinants of quality. The authors suggested an the application of design-thinking concept in the development of the service itself and an attempt to undertake improvement activities.

  • Application of different modes of nanoscale impedance microscopy in materials research
    • Artur Zieliński
    2015 Surface Innovations

    In recent years, there is noticeable interest in application of various types of scanning probe microscopy in material science research. One of them is contact atomic force microscopy combined with local impedance measurements, known as nanoscale impedance microscopy. Literature references present its application in investigations of new materials, microelectronics diagnostics, or research of protective coatings performance. In this paper, the authors present assumptions of methodology, important modes of operation, practical aspects of measurement system, and also exemplary results of application in fields of materials’ characterization.

  • Application of electronic nose based on fast GC for comparison of aroma profiles of homemade cherry "Nalewka" made with addition of different amount of sugar
    • Magdalena Śliwińska
    • Paulina Wiśniewska
    • Tomasz Dymerski
    • Waldemar Wardencki
    • Jacek Namieśnik
    2015

    Nalewka is a traditional Polish homemade spirit beverage and there are many different recepies for the production of nalewkas. However, it is not knownwhat amount of sugar can have influence of their aroma profiles. There is little information on the comparison of aroma profiles of Polish cherry nalewkas made with addition of different amount of sugar. For this purpose electronic nose based on fast GC has been used. Electronic nosewas equipped with two parallel connected columns with different stationary phases (non polar and medium polar) coupled with two ultrasensitive flame ionization detectors (μFID). Three data analysiswere used, namely Principal Component Analysis (PCA), Discriminant Function Analysis (DFA) and Soft Independent Modeling of Class Analogies (SIMCA). Application of electronic nose based on fast GC allows compare off aroma profiles of all cherry nalewkas made with addition of different amount of sugar (10 g, 25g and 50g). The results obtained by the use of PCA analysis and SIMCA classification are consistent with all the data obtainedbymeansof interpretation of the chromatograms.

  • Application of electronic nose based on fast GC for comparison of aroma profiles of homemade cherry "Nalewka" made with addition of different amount of sugar
    • Magdalena Śliwińska
    • Paulina Wiśniewska
    • Tomasz Dymerski
    • Waldemar Wardencki
    • Jacek Namieśnik
    2015

    Nalewka is a traditional Polish homemade spirit beverage and there are many different recepies for the production of nalewkas. However, it is not knownwhat amount of sugar can have influence of their aroma profiles. There is little information on the comparison of aroma profiles of Polish cherry nalewkas made with addition of different amount of sugar. For this purpose electronic nose based on fast GC has been used. Electronic nosewas equipped with two parallel connected columns with different stationary phases (non polar and medium polar) coupled with two ultrasensitive flame ionization detectors (μFID). Three data analysiswere used, namely Principal Component Analysis (PCA), Discriminant Function Analysis (DFA) and Soft Independent Modeling of Class Analogies (SIMCA). Application of electronic nose based on fast GC allows compare off aroma profiles of all cherry nalewkas made with addition of different amount of sugar (10 g, 25g and 50g). The results obtained by the use of PCA analysis and SIMCA classification are consistent with all the data obtainedbymeansof interpretation of the chromatograms.

  • Application of Fast Cameras to String Vibrations Recording
    • Józef Kotus
    • Piotr Szczuko
    • Maciej Szczodrak
    • Andrzej Czyżewski
    2015

    A hardware and software solution for guitar string vibration measurement by fast cameras is described. Orthogonal setup for 3D image acquisition is proposed capable to capture several thousand image frames per second. Dedicated image processing algorithm was developed and described in the paper, aimed at tracking the movement of some selected points along the string. Fast and accurate tracking results provided a detailed information about vibrations, that was transformed into sound samples. Described sound processing methods were applied in order to enable a comparison of captured string vibrations with the sound recorded using a microphone. Analysis of obtained results, conclusions, and future work plans are included.

  • Application of gamma densitometry and statistical signal analysis to gas phase velocity measurements in pipeline hydrotransport
    • Marcin Zych
    • Robert Hanus
    • Leszek Petryka
    • Dariusz Świsulski
    • Anna Strzępowicz
    • Piotr Zych
    2015 EPJ Web of Conferences

    The work presents selected methods of signal analysis used in the processing of data obtained from radiometric probes. The used data came from an exemplary study of a two-phase liquid-gas flow at the laboratory installation. In such rigs many possible transport types may be observed, i.e. slug, plug and bubble flow, and each of them gives different signal-to-noise ratio of recorded data. Therefore, available radiometric methods of gas phase velocity measurements give diverse accuracies. Authors consider several improvements of data acquisition and processing which increase possibility of the flow type recognition and higher accuracy of the gas phase velocity estimation.

  • Application of gas chromatography to the analysis of spirit-based alcoholic beverages
    • Paulina Wiśniewska
    • Magdalena Śliwińska
    • Tomasz Dymerski
    • Waldemar Wardencki
    • Jacek Namieśnik
    2015 CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY

    Spirit-based beverages are alcoholic drinks, which production processes are dependent on the type and origin of raw materials. The composition of this complex matrix is difficult to analyze and scientists commonly choose a gas chromatography techniques for this reason. With a wide selection of extraction methods and detectors it is possible to provide qualitative and quantitative analysis for many chemical compounds with a various functional groups. This article describes a different types of gas chromatography techniques and their associated the most common used extraction techniques (e.g. LLE, SPME, SPE, SFE or SBME) and detectors (MS, TOFMS, FID, ECD, NPD AED, O or EPD). Additionally, a brief characteristic of a world popular spirit-based beverages and application of gas chromatography to the analysis of selected alcoholic drinks were presented.

  • Application of gpr method in diagnostics of reinforced concrete structures
    • Jacek Lachowicz
    • Magdalena Rucka
    2015 Full text Diagnostyka

    This paper presents an application of the ground penetration method (GPR) for diagnostics of reinforced concrete structures. In situ measurements were conducted for three civil engineering structures: the ground floor structure, the abutment of the railway viaduct and the concrete well. The dual polarized ground penetrating radar with the antenna operating at a center frequency of 2 GHz was used for GPR surveys. Three different methodologies of measurements were analyzed. The results showed that the GPR method enables quick and efficient diagnostics of concrete structures. Based on GPR results it is possible to identify the distribution and amount of reinforcement, as well as the thickness of the concrete layer.

  • Application of Msplit method for filtering airborne laser scanning data sets to estimate digital terrain models
    • Wioleta Blaszczak-Bak
    • Artur Janowski
    • Waldemar Kamiński
    • Jacek Rapiński
    2015 INTERNATIONAL JOURNAL OF REMOTE SENSING

    ALS point cloud filtering involves the separation of observations representing the physical terrain surface from those representing terrain details. A digital terrain model (DTM) is created from a subset of points representing the ground surface. The accuracy of the generated DTM is influenced by several factors, including the survey method used, the accuracy of the source data, the applied DTM generation algorithm, and the survey conditions. This article proposes the use of a new estimation method in the filtering of point clouds obtained from airborne laser scanning (ALS), provisionally called Msplit-estimation. The application of Msplit-estimation in ALS data filtering requires the determination of the appropriate functional model for the surface, which will be used in the filtering of the set of points. A polynomial terrain surface model was selected for this purpose. Two methods of filtering using the Msplit method are presented. The first is based on the estimated parameters of the polynomial describing the surface (called the ‘quality’ approach in the article). The second method (provisionally called the ‘quantity’ method) is carried out in two stages. The first stage is point cloud filtering, which results in two subsets being created. One of these is the subset of points intended for DTM creation, while the other contains the remaining points. The second stage of the approach is the creation of a DTM from the first subset. Since the Msplit method has an analytical character, the ATIN method was selected to verify the correct operation of the method. The ATIN method is based on computational geometry and uses repeated Delaunay triangulation and statistical evaluation of the geometric parameters. Comparison of Msplit with a method based on different principles mitigates errors arising from similarly functioning methods belonging to the same group of filters. The choice of the ATIN method was also dictated by its established position among filtering algorithms. The method is well-known, documented, and verified and this ensures that filtering by this method provides a reliable result that can serve as a reference for comparison with the proposed new filtering method.

  • Application of multisine nanoscale impedance microscopy to heterogeneous alloy surface investigations
    • Artur Zieliński
    • Kazimierz Darowicki
    2015 SURFACE AND INTERFACE ANALYSIS

    In the recent years atomic force microscopy is recognized as valuable tool for investigation of surficial features of construction materials. It concerns, among other things, studies of changes caused by such phenomena as galvanic corrosion, passivation associated with the growth of oxide layers, or sensitization of austenitic steels with the formation of carbide phases. In addition, atomic forcemicroscopy allows easy coupling with impedance technique which is especially promising because of its versatility in investigations of both conductive and dielectric materials. The authors discuss the possibility of application of such type of measurement, known as impedance microscopy.

  • Application of nanofluids in selected thermal technologies
    • Janusz Cieśliński
    2015

    Some peculiarities regarding convective heat transfer of nanofluids are presented. Particularly, results of the fundamental research concerning pool boiling and single phase convection of nanofluids as well as data obtained for selected heat exchangers operated with nanofluids are discussed.

  • Application of passive sampling techniques as a usable tool in the field of environmental quality monitoring
    • Jacek Namieśnik
    • Mariusz Marć
    • Bożena Zabiegała
    2015

    Analysis of literature data published for the past 20 years leads to the conclusion, that passive sampling technique has been developing very quickly and is commonly used in the field of monitoring pollutants in air, water and soil environment. The popularity of application of passive sampling techniques in analytical and environmental chemistry results from its many advantages e.g.: Simplicity in use, low costs of exploitation, no need for expensive and complicated equipment, no power requirements, the ability to produce accurate results. Over the last decade in Department of Analytical Chemistry, Gdansk University of Technology passive sampling technique has been applied in different areas of environmental analysis and monitoring, such as: • Screening studies and source identification - determination of occurrence or identification (qualitative or semi quantitative) of pollutants present in both atmospheric and indoor air; • Determination of pollutant concentration (BTEX concentrations) in the environment (quantitative) - integration of ambient concentrations of pollutants over time scales: short-time scale (hours/days) and long-time scale (weeks/months/years). The shorter time-scales facilitate studies of pollutant dispersal, fluxes and transport processes. Long time-scales would allow the identification of source/sink regions and underlying trends in ambient levels; • Mapping the ambient distribution of BTEX (mapping concentrations) to yield input data for regional distribution models - visualization of the spatial distribution of pollution levels in the form of maps allows for sophisticated mathematical analysis and proper decision-making concerning the environment; • Human exposure assessment - personal monitoring with passive sampling - the most accurate estimate of a personal ‘true’ exposure; • Screening (non-invasive) in-situ studies on the emission flux of organic compounds (mainly VOCs) emitted from indoor materials, using miniaturized passive emission chambers. This kind of devices combines the features of classical emission chambers in a miniaturized form (miniaturized passive emission chambers), with the advantages of a passive sampling technique (low cost of particular construction elements, possibility of handling by unqualified staff).