2017 - Publications Repository - Gdańsk University of Technology

Show publications from the year

Publications from the year 2017

Show all

International Competitiveness of Czech Manufacturing: A Sectoral Approach with Error Correction Model
- Magdalena Olczyk
- Aleksandra Kordalska
2017 Full text Prague Economic Papers
The main objective of this paper is to find the determinants of the international competitiveness of the manufacturing sectors of the Czech economy, using the database of 13 manufacturing subsectors in 1995–2011, with the aid of ECM model. The authors research the question of how much foreign and domestic demand, the level of labour costs, the level of sector innovation intensity, the level of sector openness to foreign markets as well as sectoral labour productivity influence the changes in their trade balance. The results of the analysis conducted show substantial differences in the roles particular variables play in explaining the net exports in individual sectors. The results of the analysis indicate mostly a greater impact of the researched factors on net exports in long rather than short term
Internationalisation Applied?
- Karolina Wysocka
- Krzysztof Leja
2017 Full text Przedsiębiorczość i Zarządzanie
Internationalization becomes no longer a fashion and set of activities conducted by some enthusiasts, but rather a leading topic either in terms of education and research, incorporated into the core missions and strategies of universities and influencing their management. So it is everywhere in the educational world, and so it is in Poland. Declaration of the official statements does not always result in real activities. This paper describes the issues relevant to the application of internationalization and outlines the analysis needed to prove to what extent some of technical universities in Poland adopted and what impact it had on their management.
Internet photogrammetry for inspection of seaports
- Zygmunt Paszotta
- Małgorzata Szumiło
- Jakub Szulwic
2017 Full text Polish Maritime Research
This paper intends to point out the possibility of using Internet photogrammetry to construct 3D models from the images obtained by means of UAVs (Unmanned Aerial Vehicles). The solutions may be useful for the inspection of ports as to the content of cargo, transport safety or the assessment of the technical infrastructure of port and quays. The solution can be a complement to measurements made by using laser scanning and traditional surveying methods. In this paper the authors recommend a solution useful for creating 3D models from images acquired by the UAV using non-metric images from digital cameras. The developed algorithms, created and presented software allows to generate 3D models through the Internet in two modes: anaglyph and display in shutter systems. The problem of 3D image generation in photogrammetry is solved by using epipolar images. The appropriate method was presented by Kreiling in 1976. However, it applies to photogrammetric images for which the internal orientation is known. In the case of digital images obtained with non-metric cameras it is required to use another solution based on the fundamental matrix concept, introduced by Luong in 1992. In order to determine the matrix which defines the relationship between left and right digital image it is required to have at least eight homologous points. To determine the solution it is necessary to use the SVD (singular value decomposition). By using the fundamental matrix the epipolar lines are determined, which makes the correct orientation of images making stereo pairs, possible. The appropriate mathematical bases and illustrations are included in the publication.
Internet Rzeczy a internetowy protokół sieciowy IP
- Krzysztof Nowicki
- Tadeus Uhl
2017
W pracy omówiono problemy wdrażania IoT z punktu widzenia zapewniania komunikacji. Przedstawiono podstawowe wymagania jakie systemy IoT stawiają sieciowym rozwiązaniom protokolarnym. Opisano IPv6 pod kątem możliwości spełnienia tych wymagań. Wskazano na konieczność rozpowszechnienia protokołu sieciowego IPv6. Przedstawiono aktualny stan wdrożenia IPv6
Interrelationship between total volatile organic compounds emissions, structure and properties of natural rubber/polycaprolactone bio-blends cross-linked with peroxides
- Krzysztof Formela
- Mariusz Marć
- Shifeng Wang
- Mohammad Saeb
2017 POLYMER TESTING
Natural rubber/polycaprolactone (NR/PCL) bio-based blends with different organic peroxides were prepared using an internal batch mixer and subsequently cross-linked at 170°C. Two types of commonly used organic peroxides, dicumyl peroxide and di(tert-butylperoxyisopropyl)benzene peroxide, were applied as free-radical initiator. Cross-linking efficiency of NR/PCL blends were investigated using oscillating disc rheometer measurements, followed by infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, dynamic mechanical analysis and tensile testing. Total volatile organic compounds (TVOCs) emissions were determined using headspace analysis integrated with gas chromatography with flame ionization detector. Determined TVOCs emissions varying in range 21.6-52.1 μg/g and generally value of this parameter decreased with increasing content of PCL phase in studied blends or with application of more efficient di(tert-butylperoxyisopropyl)benzene peroxide as cross-linking agent. It was found that increasing of TVOCs parameter indicated deterioration of mechanical properties of NR/PCL blends, which corresponded with the changes in chemical structure and thermal properties of cross-linked NR/PCL. This confirms that evaluation of TVOCs parameter is interesting alternative for “conventional methods” to characterization of the studied bio-based blends.
Interval incidence coloring of subcubic graphs
- Anna Małafiejska
- Michał Małafiejski
2017 Full text Discussiones Mathematicae Graph Theory
In this paper we study the problem of interval incidence coloring of subcubic graphs. In [14] the authors proved that the interval incidence 4-coloring problem is polynomially solvable and the interval incidence 5-coloring problem is N P-complete, and they asked if χii(G) ≤ 2∆(G) holds for an arbitrary graph G. In this paper, we prove that an interval incidence 6-coloring always exists for any subcubic graph G with ∆(G) = 3.
Introducing Design for Disassembly Concept to the MSc Curricula
- Karol Kufel
- Jacek Wachowicz
- Ryszard Bielski
- Cezary Graul
- Mariusz Żółtowski
2017
11th International Technology, Education and Development Conference
In-tube extraction for the determination of the main volatile compounds in Physalis peruviana L
- Magdalena Kupska
- Henryk Jeleń
2017 Full text JOURNAL OF SEPARATION SCIENCE
An analytical procedure based on in-tube extraction followed by gas chromatography with mass spectrometry has been developed for the analysis of 24 main volatile components in cape gooseberry (Physalis peruviana L.) samples. According to their chemical structure, the compounds were organized into different groups: one hydrocarbon, one aldehyde, four alcohols, four esters, and 14 monoterpenes. By single-factor experiments, incubation temperature, incubation time, extraction volume, extraction strokes, extraction speed, desorption temperature, and desorption speed were determined as 60°C, 20 min, 1000 L, 20, 50:50 L/s, 280°C, 100 L/s, respectively. Quantitative analysis using authentic standards and external calibration curves was performed. The limit of detection and limit of quantification for the analytical procedure were calculated. Results shown the benzaldehyde, ethyl butanoate, 2-methyl-1-butanol, 1-hexanol, 1-butanol, -terpineol, and terpinen-4-ol were the most abundant volatile compounds in analyzed fruits (68.6–585 g/kg). The obtained data may contribute to qualify cape gooseberry to the group of superfruits and, therefore, increase its popularity.
Investigation method of large-volume tire with mobile test rig
- Karol Centkowski
2017 Full text
The goal of this research is to develop the tire test method and mobile tire test rig. The test rig enables measurement of tire properties as stiffness and viscous damping in vertical direction, and tire–ground characteristics on the asphalt rigid surface. The tire-ground characteristics are measured by force and a torque measurement hub. The design, calibration and the algorithm for calculating the forces in the wheel center are also developed in this work. The mobile tire test rig is based upon the idea of a quarter-vehicle. The vertical stiffness and viscous damping are measured by two methods. The test by free oscillation where the tire rolls over an obstacle and the test of random vibration where the tire is excited by road unevenness are used to measure the tire’s properties for large and small excitation amplitudes respectively. The third method surveys tire–ground interactions in lateral direction in a test called step response of lateral force. The aim of this test is to measure the tire’s capability for transmitting suddenly appearing transient lateral forces. During this test the forces are plotted over the wheel slip angle. The three test methods confirmed that it is possible to measure tire parameters and tire-ground characteristics with one mobile tire test rig. The significant achievements of this work are: force measuring hub, excitation ramp instead of beam in test by free oscillation, accuracy definition in the test by random vibration.
Investigation of Air Quality beside a Municipal Landfill: The Fate of Malodour Compounds as a Model VOC
- Jacek Gębicki
- Tomasz Dymerski
- Jacek Namieśnik
2017 Full text Environments
This paper presents the results of an investigation on ambient air odour quality in the vicinity of a municipal landfill. The investigations were carried out during the spring–winter and the spring seasons using two types of the electronic nose instrument. The field olfactometers were employed to determine the mean odour concentration, which was from 2.1 to 32.2 ou/m3 depending on the measurement site and season of the year. In the case of the investigation performed with two types of the electronic nose, a classification of the ambient air samples with respect to the collection site was carried out using the k-nearest neighbours (kNN) algorithm supported with the cross-validation method. Correct classification of the ambient air samples collected during the spring–winter season was at the level from 71.9% to 87.5% and from 84.4% to 94.8% for the samples collected during the spring season depending on the electronic nose type utilized in the studies. It was also revealed that the kNN algorithm applied for classification of the samples exhibited better discrimination abilities than the algorithms of the linear discriminant analysis (LDA) and quadratic discriminant function (QDA) type. Performed seasonal investigations proved the ability of the electronic nose to discriminate the ambient air samples differing in odorants’ concentration and collection site.
Investigation of behaviour of metal structures with polymer dampers under dynamic loads
- Natalia Lasowicz
- Robert Jankowski
2017 Full text Procedia Engineering
A large number of accidents concerning structures subjected to dynamic loads have been recently observed. One of the examples of such a structure is a temporary steel grandstand erected using scaffolding system. Dynamic load that is generated by crowd movement has a significant influence on the behaviour of the structure and may lead to excessive structural vibrations. The aim of the study is to consider the idea of using polymer dampers in reduction of vibrations of metal structures exposed to dynamic loads. Firstly, the preliminary analysis of a cantilevered composite beam, consisting of two aluminium flat bars bonded with polymer mass, has been conducted. Dynamic parameters, such as modes of free vibrations, corresponding natural frequencies and damping ratios, have been determined and compared with values estimated for the plain aluminium cantilevered beam. In the second stage of the investigation, the effectiveness of using polymer damper in reduction of vibrations of a steel scaffolding grandstand under crowd load has been considered. The behaviour of the structure equipped with typical tubular stiffener as well as with the additional damper has been analysed and dynamic parameters for both models have been compared. Dynamic analyses have been focused on the peak values of accelerations and displacements of the structures analysed. The results of the study clearly show that the response of the composite aluminium beam as well as a steel scaffolding grandstand with and without polymer members is substantially different. In the case of the aluminium beam, the application of the polymer layer may lead to even ten times higher values of damping ratio and results in lower values of peak accelerations and displacements. A similar situation concerns also a steel scaffolding grandstand for which the reduction in structural vibrations after installation of additional polymer damper has been found to be substantial.
Investigation of educational processes with affective computing methods
- Agnieszka Landowska
- Grzegorz Brodny
2017 Full text e-mentor
This paper concerns the monitoring of educational processes with the use of new technologies for the recognition of human emotions. This paper summarizes results from three experiments, aimed at the validation of applying emotion recognition to e-learning. An analysis of the experiments’ executions provides an evaluation of the emotion elicitation methods used to monitor learners. The comparison of affect recognition algorithms was based on the criteria of availability, accuracy, robustness to disturbance, and interference with the e-learning process. The lessons learned in these experiments might be of interest to teachers and e-learning tutors, as well as to those researchers who want to use affective computing methods in monitoring educational processes.
Investigation of poly(3,4-ethylenedioxythiophene) deposition method influence on properties of ion-selective electrodes based on bis(benzo-15-crown-5) derivatives
- Maciej Jeszke
- Konrad Trzciński
- Jakub Karczewski
- Elżbieta Luboch
2017 Full text ELECTROCHIMICA ACTA
Glassy carbon electrodes modified by conductive polymers and membrane with derivatives of bis(benzo-15-crown-5) were tested as solid contact ion selective electrodes for K+ ions concentration determination. PEDOT with PSS, Cl- and ClO4- counter ions was electrochemically deposited onto glassy carbon substrates using four different electrochemical approaches (potentiostatic, galvanostatic, potentiodynamic and potentiostatic pulses). Scanning electron microscopy was applied to investigate influence of electrodeposition method on morphology of polymer films and drop-casted pseudo liquid membrane with an ionophore. The presence of the polymer film and method of deposition affect morphology of tested electrodes and sensing properties as well. The best sensing properties were obtained for the electrodes with biscrown as ionophore with polymer which have a developed surface prepared via potentiostatic pulses (logKK/Na = -5.6 using separate solution method (SSM)). Galvanostatic method of electrodeposition which resulted in relatively smooth layer of the PEDOT exhibited the poorest sensing properties for sensor with biscrown as ionophore (logKK/Na = -4.3 for SSM). All prepared sensors exhibited very favorable values of selectivity coefficients KK/Na (log KK/Na= -5.6 - -4.0). Detection limit equals to 10-7 M was achieved. The influence of pH for sensing properties were investigated for the selected electrodes.
Investigation of some magnetospheric phenomena of geomagnetic storm on March 17, 2013 based on observations from GNSS and NOAA-15 satellite
- Yevgen M. Zanimonskiy
- Oleksiy Dudnik
- Grzegorz Nykiel
- Mariusz Figurski
2017
Substantial variations of magnetospheric electron fluxes of low and intermediate energies at an altitude of ~ 800 km at different phases of the geomagnetic storm were investigated. The ionosphere and plasmasphere response was analyzed using TEC variation maps over the Central Europe. A concept of the connection of TEC variations above the Central Europe and spatially inhomogeneous fluxes of energetic particles is being proposed.
Investigation of the impact of ITRF2014/IGS14 on the positions of the reference stations in Europe
- Mariusz Figurski
- Grzegorz Nykiel
2017 Full text Acta Geodynamica et Geomaterialia
In January 2017, the new realization of the International Terrestrial Reference Frame (ITRF) – ITRF2014, was released. Besides the higher accuracy and consistency of the new frame, an entirely new element – the post seismic deformation - was included. Moreover, the definition of the fundamental points has also been changed. All changes related to the new reference frame haveconsequences in the precise positioning using GNSS observations. In this paper, on the basis of results and analysis obtained from Bernese 5.2 software package, the most important changes, related to GNSS data processing are presented. Our analysis confirmedthat the differences between ITRF2008 and ITRF2014 are minor. However, changing GNSS antenna calibrations from IGb08 to IGS14 causes changes of stations coordinates up to several millimeters, especially for the vertical component. This effect is mainly due to the introduction of new or updated absolute antenna calibrations. Such changes of coordinates have also impact on the realizationof the European Terrestrial Reference Frame (ETRF).
Investigation of tracking systems properties in CAVE-type virtual reality systems
- Magda Szymaniak
- Adam Mazikowski
- Michał Meironke
2017
In recent years, many scientific and industrial centers in the world developed a virtual reality systems or laboratories. One of the most advanced solutions are Immersive 3D Visualization Lab (I3DVL), a CAVE-type (Cave Automatic Virtual Environment) laboratory. It contains two CAVE-type installations: six-screen installation arranged in a form of a cube, and four-screen installation, a simplified version of the previous one. The user feeling of "immersion" and interaction with virtual world depend on many factors, in particular on the accuracy of the tracking system of the user. In this paper properties of the tracking systems applied in I3DVL was investigated. For analysis two parameters were selected: the accuracy of the tracking system and the range of detection of markers by the tracking system in space of the CAVE. Measurements of system accuracy were performed for six-screen installation, equipped with four tracking cameras for three axes: X, Y, Z. Rotation around the Y axis was also analyzed. Measured tracking system shows good linear and rotating accuracy. The biggest issue was the range of the monitoring of markers inside the CAVE. It turned out, that the tracking system lose sight of the markers in the corners of the installation. For comparison, for a simplified version of CAVE (four-screen installation), equipped with eight tracking cameras, this problem was not occur. Obtained results will allow for improvement of cave quality.
Investigation on domestic fruits seed oils in personal care emulsion systems
- Olga Krasodomska
2017 Full text
The use of fruit seed oils in personal care products is of significance to both their function and image. Poland is an important processor of fruit products within the EU, and thus has a large availability of seeds from domestic fruits, which are normally considered to be a waste material. Unfortunately, current literature is scarce of the suitability of these oils for topical use in the form of cosmetic emulsions. Published data on these oils is generally limited to their use in the food industry. The aim of this dissertation was to determine the viability of domestic fruit seeds, such as apple, blackberries, blackcurrants, plum and strawberries as sources of unsaturated fatty acids (PUFAs) in personal care emulsions. To that end the seed oils were tested for their fatty acids composition. Consequently, the fruit seed oils were used as an additive in the oily phase components in oil-in-water (O/W) systems and nanostructured lipid carriers (NLCs). The latter as a delivery and protection system for the PUFAs The O/W systems stability, rheological properties and the sensory analysis were tested. The best emulsion obtained during the formulation optimization process had the composition 4% and 5% of seed oil with an o:w phase ratio 20:80. The best stability had the emulsions with ratio polar:nonpolar lipid 60:40 respectively. In fact, the bioactive components are useful only if they are able to penetrate the skin unchanged. Therefore, an alternate way to deliver naturally occurring PUFAs was presented. Thermodynamic (DSC) and structural techniques (1H NMR) were applied in order to characterize the obtained systems in terms of seed oil incorporation into the NLC, and oxidative stability tests were used to confirm the protective quality of the systems. During the formulation optimization process the most stable nanosuspension with the best seed oil incorporation was a mixture of 4% nonionic emulsifiers, 88% water and 6% lipids with a ratio of 6:2, wax:oil. The oxidative stability tests showed that the NLC was an effective method of protection of the PUFAs.
Investigations of quasi-static vortex structures in 2D sand specimen under passive earth pressure conditions based on DEM and Helmholtz-Hodge vector field decomposition.
- Jan Kozicki
- Andrzej Tejchman-Konarzewski
2017 Full text GRANULAR MATTER
Artykuł przedstawia wyniki obliczeń quasi-statycznych struktur wirowych w 2-wymiarowej próbce piasku w warunkach pasywnego parcia gruntu. Zastosowano metodę elementów dyskretnych i dekompozycję Helmholtza-Hodge’a pola wektorowego. Stwierdzono bliską zależność między wirami a miejscem powstania strefy lokalizacji odkształceń stycznych.
INVESTIGATIONS OF QUASI-STATIC VORTEX-STRUCTURES IN 3D SAND SPECIMENS BASED ON DEM AND HELMHOLTZ-HODGE VECTOR FIELD DECOMPOSITION.
- Jan Kozicki
- Andrzej Tejchman-Konarzewski
2017 Photonics and Nanostructures-Fundamentals and Applications
Artykuł omawia wyniki numeryczne dotyczące struktur wirowych w materiałach granulowanych w warunkach 3D. Obliczenia wykonano dla ściskania dwuosiowego. W symulacjach wykorzystano metodę elementów dyskretnych i dekompozycję pola wektorowego wg Helmholtza-Hodge’a Struktury wirowe okazały się znakomitym prekursorem lokalizacji odkształceń stycznych w materiałach granulowanych podczas obciążenia.
Investigations of vortex-structures in granular bodies based on DEM and Helmholtz-Hodge flow field decomposition
- Jan Kozicki
- Andrzej Tejchman-Konarzewski
2017 SpringerPlus
Artykuł omawia wyniki numeryczne dotyczące struktur wirowych w materiałach granulowanych. Obliczenia wykonano dla stanu pasywnego przemieszczającej się sztywnej ścianki. W symulacjach wykorzystano metodę elementów dyskretnych i dekompozycję Helmholtza/Hodge’a pola prędkości. Struktury wirowe okazały się znakomitym prekursorem lokalizacji odkształceń stycznych w materiałach granulowanych.