2014 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2014

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Studencki Konkurs Mostów Stalowych
- Magdalena Rucka
2014 Pismo PG
Relacja ze Studenckiego Konkursu Mostów Stalowych 2014.
Studenckie Staże Zawodowe - Analiza Procesu Kwalifikacji w Kontekście Dopasowania Człowiek - Organizacja
- Małgorzata Grabus
- Katarzyna Rembarz
2014 Pełny tekst Przestrzeń Ekonomia Społeczeństwo
Proces kwalifikacji studentów na staże zawodowe ma charakter intuicyjny, główną rolę odgrywają w nich studenci oraz pracodawcy - oferenci staży. Skuteczność procesu można pokazać poprzez analizę sytuacji krytycznych. Artykuł omawia sytuacje, jakie pojawiły się w dwóch edycjach kwalifikowania na staże zawodowe. Do analizy procesu zastosowano dwie koncepcje teoretyczne: model ASA oraz dopasowanie organizacyjne, stosowane w doborze pracowników. Efektem podjętych prac jest analiza przyczyn sytuacji krytycznych, opisanie uwarunkowań procesu kwalifikacji, a także zalecenie odnośnie modyfikacji działań, które można wykorzystać w kolejnych edycjach kwalifikacji na studenckie staże zawodowe.
STUDENTS' PERCEPTION OF E-GRADING: INFORMATICS COURSE CASE STUDY
- Arkadiusz Naruk
2014 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Using computers for grading can simplify work for teachers. However it is a sensitive part of their work and must be performed carefully. More information is required on students' reception and opinions about e-grading. This paper is a case study of e-grading used in Informatics course and discusses results obtained from surveying the students after being graded by a teacher and a computer.
Studienty, aspiranty i stazery iz Armenii, Azerbejdzana, i Polsze
- Krystyna Gomółka
2014 Pełny tekst Facta Simonidis. Zeszyty Naukowe Państwowej Wyższej Szkoły Zawodowej w Zamościu
Streszczenie: Studenci, doktoranci i stażyści z Armenii, Azerbejdżanu i Gruzji rozpoczęli przyjazdy na studia i staże do Polski na przełomie XX/XXI w. Powodem były przemiany polityczne w Polsce, dzięki którym dostęp do polskiego rynku edukacyjnego stał się łatwiejszy, a oferta przygotowana przez polskie uczelnie atrakcyjniejsza. Duże znaczenie w zwiększeniu przyjazdów cudzoziemców do Polski miały nowe programy stypendialne stworzone na mocy bilateralnych umów rządowych, planów wykonawczych inicjatyw międzynarodowych tj. Partnerstwo Wschodnie oraz propozycji organizacji pozarządowych.
Studies on formation and percolation in ionic liquids/TX-100/water microemulsions
- Justyna Łuczak
- Jan Hupka
2014 JOURNAL OF MOLECULAR LIQUIDS
Ternary microemulsion systems of H2O/Triton X-100/[BMIM][Tf2N], and H2O/Triton X-100/[BMIM][PF6] were prepared, compared and characterized for phase behavior for different water/surfactant ratios, at 25 °C. It was found that a change of an anion structure in the ionic liquids determines the total monophasic area of the systems. A liquid crystalline mesophase was detected in H2O/Triton X-100/[BMIM][PF6]. The microemulsion domains were identified by means of conductivity, viscosity and dynamic light scattering measurements. An increase in water mass fraction resulted in an increase of electrical conductivity of both systems, however not as rapid as in typical microemulsion systems. The conductivity data were analyzed in terms of percolation theory, and itwas revealed, that the theory may be adopted only partially. The variations of the dynamic viscosity of surfactant/ IL mixtures, as a function of watermass fraction along the experimental dilution lines, differ significantly from typical solvent based microemulsions. The size of water/IL microemulsion droplets, measured by dynamic light scattering, is nearly independent on the content of water.
Studies on origin of Polish honeys by two-dimensional gas chromatography Ocena pochodzenia surowcowego polskich miodów przy użyciu dwuwymiarowej chromatografii gazowej
- Tomasz Dymerski
- Jacek Gębicki
- Jacek Namieśnik
2014 Przemysł Chemiczny
Polish acacia, linden, rapessed and buckwheat-derived honeys and a honydew were analysed for presence of hydrocarbons, alcs., ketones and esters by 2-dimensional gas chromatog. to establish the markers for the honey origin. PrOH was found characteristic for acacia honey, Me(CH2)11OH for linden honey, Me(CH2)6CHOMe for honeydew and Me(CH2)8COOEt for the rapeseed honey. Wykorzystano technikę dwuwymiarowej chromatografii gazowej sprzężonej ze spektrometrią mas, w której wykorzystuje się pomiar czasu przelotu jonów fragmentacyjnych przez detektor (GC×GC-TOFMS) do klasyfikacji polskich miodów, ze względu na pochodzenie surowcowe. Opracowana metodyka pozwoliła na wytypowanie 8 wyróżników pozwalających na jednoznaczne określenie pochodzenia próbek polskich miodów. Wynik obróbki danych metodą chemometryczną, a mianowicie analizą głównych składowych (PCA), potwierdził użyteczność wytypowanych wyróżników. Uzyskane wyniki mogą stanowić uzupełnienie polskiej normy i być stosowane do rutynowych badań w polskim pszczelarstwie.
Studies on the Presence and Spatial Distribution of Anthropogenic Pollution in the Glacial Basin of Scott Glacier in the Face of Climate Change (Fiord Bellsund, Spitsbergen)
- Sara Lehmann-Konera
- Waldemar Kociuba
- Łukasz Franczak
- Grzegorz Gajek
- Leszek Łęczyński
- Katarzyna Kozak
- Małgorzata Szopińska
- Marek Ruman
- Żaneta Polkowska
2014 AIP Conference Proceedings
The study area covered the NW part of the Wedel Jarlsberg Land (SW part of the Svalbard Archipelago). The primary study object was the catchment of the Scott Glacier in the vicinity of the Research Station of of Maria Curie-Skłodowska University in Lublin – Calypsobyen. The Scott River catchment (of glacial hydrological regime) has an area of approximately 10 km2, 40% of which is occupied by the valley Scott Glacier in the phase of strong recession. The present study concerns the determination of physical and chemical parameters (pH, conductivity, TOC) and concentrations of pollutants (phenols, aldehydes).
Studies on the use of terrestrial laser scanning in the maintenance of buildings belonging to the cultural heritage
- Magdalena Bernat
- Artur Janowski
- Sławomir Rzepa
- Anna Sobieraj-Żłobińska
- Jakub Szulwic
2014
Within the frames of the use of terrestrial laser scanning we find numerous examples of registration of building facilities, including also historical and valuable in their culture. In the case presented in this paper, at the root of the problem there is a preservation of the historic blacksmith's forge located in Gdansk Orunia. The facility dating from the early nineteenth century was intended to repair involving the complete demolition and rebuilt in the historical form but with the use of new materials. Only selected elements were to be retained, creating a kind of architectural artefacts and handicrafts. Implementation of the laser scanning was carried out in a conventional manner, though in difficult field conditions. The obtained data have become good material to carry out analyses concerning construction and surveying. The paper presents results of studies on using laser scanning and possible problems which can appear during measurements and data processing. It also indicated solutions for proliferation of the data and models based on point clouds.
STUDIES ON THE USE OF TERRESTRIAL LASER SCANNING IN THE MAINTENANCE OF BUILDINGS BELONGING TO THE CULTURAL HERITAGE
- Artur Janowski
- Anna Sobieraj-Żłobińska
- Jakub Szulwic
2014
Within the frames of the use of terrestrial laser scanning we find numerous examples of registration of building facilities, including also historical and valuable in their culture. In the case presented in this paper, at the root of the problem there is a preservation of the historic blacksmith’s forge located in Gdansk Orunia. The facility dating from the early nineteenth century was intended to repair involving the complete demolition and rebuilt in the historical form but with the use of new materials. Only selected elements were to be retained, creating a kind of architectural artefacts and handicrafts. Implementation of the laser scanning was carried out in a conventional manner, though in difficult field conditions. The obtained data have become good material to carry out analyses concerning construction and surveying. The paper presents results of studies on using laser scanning and possible problems which can appear during measurements and data processing. It also indicated solutions for proliferation of the data and models based on point clouds.
Study of Cloud Water Samples Collected over Northern Poland
- Żaneta Polkowska
- Marek Błaś
- Dariusz Lech
- Jacek Namieśnik
2014 JOURNAL OF ENVIRONMENTAL QUALITY
The paper gives the results of the first studies on the chemistry of cloud water collected during 3 mo (Aug.–Oct. 2010) in the free atmosphere over the area to the south of the Tri-City (Gdansk-Sopot-Gdynia) conurbation on the Gulf of Gdansk, Poland. Taken from cumulus, stratus, and stratocumulus clouds by means of an aircraft-mounted collector, the water samples were analyzed for the following contaminants: anions (chlorides, fluorides, nitrates, sulfates, and phosphates), cations (lithium, sodium, potassium, ammonium, calcium, and magnesium), and trace metals. In addition, pH values were measured, and the type and composition of suspended particulate matter was determined. We discuss the relationship between the concentration of inorganic ions and the type of cloud from which water was sampled. The chemistry is also likely related to the circulation pattern and inflow of clean air masses from the Baltic Sea. Moreover, a relationship was found between the composition of the samples examined and the location of pollutant emission sources.
Study of data scheduling methods in the WiMAX Mobile metropolitan area networks
- Marcin Sokół
2014 Archives of Transport System Telematics
The paper discusses basic assumptions of the WiMAX Mobile system. It also presents and analyses the results of simulation tests run for selected data scheduling methods and subcarrier allocation. Based on the test results, the authors have prepared a comparative analysis of two popular data scheduling methods, i.e. WRR and PF, and their own method CDFQ which uses information about the current channel situation for the queuing processes and data allocation. The tests have been conducted with a simulator designed by the authors, based on work defined quality criteria.
Study of microstress state of P91 steel using complementary mechanical Barkhausen, magnetoacoustic emission, and X-ray diffraction techniques
- Bolesław Augustyniak
- Leszek Piotrowski
- Paweł Maciakowski
- Marek Chmielewski
- Marzena Lech-Grega
- Janusz Żelechowski
2014 Pełny tekst JOURNAL OF APPLIED PHYSICS
The paper deals with assessment of microstress state of martensite P91 steel using three complementary techniques: mechanical Barkhausen emission, magnetoacoustic emission (MAE), and X-ray diffraction (XRD) profile analysis. Magnetic coercivity Hc and microstructure were investigated with inductive magnetometry and magnetic force microscopy (MFM), respectively. Internal stress level of P91 steel was modified by heat treatment. Steel samples were austenitized, quenched, and then tempered at three temperatures (720 °C, 750 °C, and 780 °C) during increasing time (from 15 min up to 240 min). The microstrain level ε i was evaluated using Williamson–Hall method. It was revealed that during tempering microstrain systematically decreases from ε i = 2.5 × 10−3 for as quenched state down to ε i = 0.3 × 10−3 for well tempered samples. Both mechanical hardness (Vicker's HV) and magnetic hardness (coercivity) decrease almost linearly with decreasing microstrain while the MAE and MBE intensities strongly increase. Tempering leads to evident shift of the MeBN intensity maximum recorded for the first load towards lower applied strain values and to increase of MAE intensity. This indicates that the microstress state deduced by magnetic techniques is correlated with microstrains evaluated with XRD technique.
SUBJECTIVE PERCEPTION OF MUSIC GENRES IN THE FIELD OF MUSIC INFORMATION RETRIEVAL SYSTEMS
- Piotr Hoffmann
- Bożena Kostek
2014
The aim of this paper is to evaluate the relationship between perception of music genres and subjective features of music that can be assigned to them. For this purpose a group of subjective features such as loudness, melody, rhythm, volume, instrumentation was chosen to describe music genres. A group of 30 listeners with normal hearing, ranging from 20 to 40, was created. Each sub-ject participating in listening tests was asked to choose perceptual features of music which best correspond to the given music genre. Music genres were limited to six most typical ones for this group of listeners, i.e.: Classical, Electronic, Jazz, Pop, Rap, Rock. On the basis of the listeners’ answers the statistical V-Cramer test was conducted to find the correlation between evaluated fea-tures and music genres. Identification of potential features that may be important for music recog-nizing can result in a more efficient automatic classification of music genres. Results of the carried out subjective tests and statistical analysis were included.
SUBJECTIVE PERCEPTION OF MUSIC GENRES IN THE FIELD OF MUSIC INFORMATION RETRIEVAL SYSTEMS
- Piotr Hoffmann
- Bożena Kostek
2014
The aim of this paper is to evaluate the relationship between perception of music genres and subjective features of music that can be assigned to them. For this purpose a group of subjective features such as loudness, melody, rhythm, volume, instrumentation was chosen to describe music genres. A group of 30 listeners with normal hearing, ranging from 20 to 40, was created. Each sub-ject participating in listening tests was asked to choose perceptual features of music which best correspond to the given music genre. Music genres were limited to six most typical ones for this group of listeners, i.e.: Classical, Electronic, Jazz, Pop, Rap, Rock. On the basis of the listeners’ answers the statistical V-Cramer test was conducted to find the correlation between evaluated fea-tures and music genres. Identification of potential features that may be important for music recog-nizing can result in a more efficient automatic classification of music genres. Results of the carried out subjective tests and statistical analysis were included.
SUBSOIL CHARACTERISTICS OF THE VISTULA RIVER DIKES
- Lech Bałachowski
- Zbigniew Sikora
2014
The results of CPTU tests are used to determine the strength parameters of a dike subsoil. Stress state and stress history of the subsoil under the flood embankment was evaluated with CPTU and DMT tests. Normally consolidated soil was found under the central part of the dike, while the subsoil near the dike toe is found to be overconsolidated. Due to consolidation the undrained shear strength of the subsoil under the central part of the dike is generally higher than near the dike toe. The undrained shear strength estimated with CPTU tests depends also on the complex phenomena of the filtration under the dike. The CPTU dissipation tests in soft soils and the monotonic decay of water pressure induced during penetration under the central part of the dike confirm the presence of normally consolidated subsoil. Dilatory pore pressure response, typical for overconsolidated soils, was mainly observed in the tests performed at the toe of the dike at the waterside and downstream side. The shape of pore water dissipation curve reflects stress state and stress history of the subsoil.
Suitability study of hybrid model of electrodynamic actuator
- Piotr Jankowski
- Mirosław Wołoszyn
2014 INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
The paper presents the proposal of the hybrid circumferential model of an electrodynamic actuator. The field model uses the inductor current as the input data which is obtained from the circumferential model or experimentally.
Suitability study of hybrid model of electrodynamic actuator
- Piotr Jankowski
- Mirosław Wołoszyn
2014
This paper presents the proposal of the hybrid circuit-field model of an electrodynamic actuator. The field model uses the inductor current as the input data which is obtained from the circuit model or experimentally. The field model implemented using the FLUX program makes it possible to easily determine the pressure distribution acting on the disc. The results have been verified experimentally.
Sulfur compounds: Gas chromatography
- Waldemar Wardencki
2014
Sulfur compounds, due to their properties, are responsible for the damage of our environment. For this reason sulfur containing compounds are of constant concern in many fields. Gas chromatography (GC), due to combination of separation capability and sensitive detection is a prime technique for the analysis of thes compounds in various matrices. The chapter rewies general problems of the determination of these compounds by GC and the procedures used for their determinations in different matrices, including using different separation and detection systems and calibration. The examples of applications of these approaches are given in form of figures and tables.
Supercapacitors - charge redistribution and restoring voltage
- Tomas Kuparowitz
- Vlasta Sedlakova
- Arkadiusz Szewczyk
- Lech Hasse
- Janusz Smulko
- Jiri Majzner
- Petr Sedlak
- Josef Sikula
2014
The charge in supercapacitor is stored on electrodes and in electrolyte. The charges on electrodes create the Helmholtz double layer which is formed immediately with time constant of the order of seconds, while the charge storage in electrolyte is going on with time constant of the order of hundreds seconds. When the charged supercapacitor is shorted for few seconds, the charge from electrodes is discharged while the charge in electrolyte remains mostly unchanged. The charge from electrolyte is redistributed by diffusion to the electrodes, until the charge on electrodes form the electric field which acts against the charge concentration gradient. Supercapacitor capacitance value depends on the voltage supercapacitor terminals; with increasing voltage total capacitance increases.
Supercomputing Grid-Based Services for Hearing Protection and Acoustical Urban Planning, Research and Education
- Maciej Szczodrak
- Andrzej Czyżewski
- Józef Kotus
- Bożena Kostek
2014 LECTURE NOTES IN COMPUTER SCIENCE
Specific computational environments, so-called domain grids, are developed within the PLGrid Plus project in order to prepare specialized IT solutions, i.e., dedicated software implementations and hardware (infrastructure adaptation), suited for particular research group demands. One of the PLGrid Plus domain grids, presented in this paper, is Acoustics. The article describes in detail two kinds of the acoustic domain services. The first can be used to calculate noise maps of large city areas, and is called "Noise Map". The second, called the "Hearing" service, enables simulations of noise impact on the human hearing system. Several kinds of usage scenarios of the developed services are also presented and illustrated by exemplary results. The infrastructure and the software developed can be utilized mainly for research and education purposes. The engineered software is intended for creating maps of noise threat for roads, railways and industrial sources. Integration of the software services with a distributed sensor network enables to automatically update the noise maps for a specific time period. A unique feature of the developed software is the possibility to estimate the auditory effects, which are caused by the exposure to noise. This estimation is based on the calculated noise levels and on a given exposure period. The outcomes of this research study are presented in form of a cumulative noise dose and characteristics of the temporary threshold shift.