2014 - Repozytorium publikacji - Politechnika Gdańska

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Estimation of Selected Synchronous Generator Parameters Based on the Gradient Method
- Zbigniew Lubośny
- Jacek Klucznik
- Krzysztof Dobrzyński
2014 Pełny tekst Acta Energetica
The authors present a method for the estimation of synchronous generator model parameters using a gradient algorithm. The paper shows an example of model parameter estimation for a turbogenerator and hydrogenerator, based on the generator voltage time responses obtained during an active and reactive power rejection test.
Estimation of the effectiveness of nbpt for limiting ammonia emission from urea based on the field experiments
- Tadeusz Marcinkowski
- Waldemar Wardencki
2014 Pełny tekst Ecological Chemistry and Engineering S - Chemia i Inżynieria Ekologiczna S
The efectiveness of the ammonia emission reduction from NBPT-stabilized urea was investigating in 2011 during a field experiment on a grassland plot fertilized with a one-time dose of 60 kgN/ha. The obtained reduction coefficient of ammonia emission equaled 73% and 39-51% relative to erea without the inhibitor and ammonium nitrate, respectively.
E-technologie w diagnozie i pomiarach postępów terapii dzieci z autyzmem w Polsce
- Agnieszka Landowska
- Agata Kołakowska
- Anna Anzulewicz
- Paweł Jarmołkowicz
- Joanna Rewera
2014 Pełny tekst e-mentor
Celem artykułu jest przeanalizowanie możliwości wsparcia technologicznego - w szczególności z wykorzystaniem urządzeń mobilnych - diagnozy i oceny postępów terapii dzieci z autyzmem. W ramach badań dokonano przeglądu istniejących rozwiązań wspierających diagnozę i pomiar postępów terapii oraz przeprowadzono ankietę w polskich ośrodkach zajmujących się pracą z osobami dotkniętymi autyzmem. Wyniki badania wskazują na zainteresowanie narzędziami wspierającymi proces terapeutyczny i diagnostyczny oraz automatyczną ocenę postępów terapii. Narzędzia takie, poprzez wprowadzenie obiektywnych kryteriów diagnostycznych ułatwiłyby i przyspieszyły proces stawiania wstępnej diagnozy, dzięki czemu dzieci autystyczne mogłyby zostać odpowiednio wcześnie poddane właściwej terapii. To z kolei przyczyniłoby się do zwiększenia ich szans na samodzielne życie w przyszłości.
E-technologie w edukacji i terapii dzieci z autyzmem w Polsce
- Agnieszka Landowska
- Agata Kołakowska
- Anna Anzulewicz
- Paweł Jarmołkowicz
- Joanna Rewera
2014 Pełny tekst EduAkcja. Magazyn Edukacji Elektronicznej
Artykuł dotyczy możliwości wsparcia technologiami informacyjnymi edukacji i terapii dzieci z za - burzeniami rozwoju ze spektrum autyzmu. Szczególna uwaga zostanie poświęcona aplikacjom przeznaczonym na urządzenia mobilne (tablety). Artykuł podsumowuje przesłanki zastosowania tabletów w pracy z dziećmi auty - stycznymi oraz pokazuje kategorie aplikacji, jakie mogą wspierać terapię i edukację dzieci. Zostały przedstawione wyniki ankiety przeprowadzonej wśród ośrodków terapeutycznych w Polsce dotyczącej wykorzystania tabletów, a także przekonań terapeutów dotyczących zastosowania tych urządzeń. Wyniki ankiety pozwalają na stwierdzenie, że tablety już wkraczają do ośrodków w Polsce jako wspomaganie prowadzonych zajęć, a jednocześnie wszystkie ośrodki nie używające tabletów zadeklarowały chęć ich zastosowania. Terapeuci postrzegają tablety i dedykowane aplikacje jako wartościową pomoc, a przy tym uważają, że dzieci chętnie używają tych urządzeń.
e-Technologie w kształceniu inżynierów, czyli nowoczesna edukacja pokolenia mediów cyfrowych
- Anita Maria Dąbrowicz-Tlałka
2014 Pełny tekst EduAkcja. Magazyn Edukacji Elektronicznej
Technologie informacyjno-komunikacyjne zmieniają współczesną edukację i pozwalają na wprowadzanie innowacyjnych metod przekazywania wiedzy i zdobywania umiejętności. Popyt na wiedzę jest ogromny – kształtuje go coraz bardziej zaawansowane technologicznie i infor - macyjnie społeczeństwo oraz rynek pracy, na którym wiele osób, pracujących w zawodach do tej pory nie wymagających umiejętności cyfrowych, stanęło przed koniecznością poszukiwania nowych ścieżek dalszego kształcenia lub budowania nowych dróg swojej kariery zawodowej. Konferencja e-Technologie w Kształceniu Inżynierów , która odbyła się dnia 30 kwietnia 2014 r. na Politechnice Gdańskiej, była właśnie miejscem, w którym wszyscy zainteresowani mogli podzielić się swoimi doświadczeniami w wykorzystaniu modeli i strategii pedagogicznych w e-nauczaniu oraz możliwościami i ograniczeniami, jakie niesie technologia w kształceniu technicznym. Konferencja miała na celu między innymi popularyzację najnowszych technologii w edukacji inżynierskiej oraz pokazanie dobrych praktyk w tym zakresie.
E-Technologies in Teaching Research Methodology for Engineers – a Case Study of the Course for International Postgraduate Students
- Wlodek Kulesza
- Bartosz Jachimczyk
- Damian Dziak
2014 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
The Research Methodology course for postgraduate students is challenging, even for an experienced academic teacher. The primary objective of this course is to prepare participants to conduct scientific research and publish the results. This case study presents an original teaching method applied to Research Methodology with Emphasis on Engineering Science, for international engineering students at Blekinge Institute of Technology in Karlskrona, Sweden. The demanding requirements of the course, a varying number of enrolled students, and a large number of assignments which need to be tracked and guided by the teacher are all conditions that need a custom approach and modern tools. The opportunities offered by e-technologies help to fulfill these course requirements. This article shows how e-tools such Itslearning, Doodle, Zotero or scientific database search engines, can be implemented to support the teaching objectives. Using these tools, a single academic teacher can accomplish the eight-week course of Research Methodology, for up to 180 students working in 60 project groups without compromising teaching quality and students’ satisfaction. The course also has been appreciated by colleagues and mentioned in the Master program evaluation of the Swedish Higher Education Authority.
„Eulerian – Eulerian” versus ,,Eulerian –Lagrangean” models of condensation
- Sebastian Kornet
- Janusz Badur
2014 Logistyka
Liquid phase in the flowing vapor through stages of the steam turbine is the cause of a lot of failures. Nowadays, due to work of steam turbines at partial load, process of homogeneous and heterogeneous condensation still is current. The formation of drops of condensate under conditions other than nominal operation of turbine is a process still unknown. Engineers and designers involved in the development of power station machines using condensable working fluids, have a need to better understand the impact of moisture formation on a machine performance and its life time. In meeting this interest the large-scale experiments and measurements are generally most significant and required if the technical process is to be considered. Sometime, in these researchers, the numerical tools of Computational Fluid Dynamics (CFD) have become useful, giving a more detailed view on irreversible processes. In the present paper we have focused on the prediction of the spontaneous condensation in wet steam flow. Two main types of non-equilibrium condensation models are considered and compared. These are: eulerian-eulerian multi-phase approach and lagrangean-eulerian FSI approach.
Europeizacja działalności gospodarczej w warunkach jednolitego rynku europejskiego
- Nelly Daszkiewicz
2014 Pełny tekst Horyzonty Polityki
W artykule wyjaśniono istotę procesów europeizacji i internacjonalizacji oraz zasady funkcjonowania jednolitego rynku europejskiego. Wskazano również na zależności między omawianymi procesami. Przedstawiono najważniejsze teorie w obrębie integracji ekonomicznej i umiędzynarodowienia gospodarek (poziom makro) jak i przedsiębiorstw (poziom mikro).
EVALUATION OF CAUSES OF CORROSION OF PLATE HEATEXCHANGER
- Kazimierz Darowicki
- Stefan Krakowiak
- Tadeusz Sonneck
2014
Przeprowadzono analizę zniszczeń korozyjnych wykrytych na płycie wymiennika ciepła stosowanego do chłodzenia silnika głównego statku. Stwierdzono obecność wżerów korozyjnych oraz korozji szczelinowej. Przedstawiono możliwe przyczyny wystąpienia w.w. uszkodzeń.
Evaluation of Path Based Methods for Conceptual Representation of the Text
- Łukasz Kucharczyk
- Julian Szymański
2014
Typical text clustering methods use the bag of words (BoW) representation to describe content of documents. However, this method is known to have several limitations. Employing Wikipedia as the lexical knowledge base has shown an improvement of the text representation for data-mining purposes. Promising extensions of that trend employ hierarchical organization of Wikipedia category system. In this paper we propose three path-based measures for calcu- lating document relatedness in such conceptual space and compare them with the Path Length widely used approach. We perform their evaluation using the OPTICS clustering algorithm for categorization of keyword-based search results. The results have shown that our method outperforms the Path-Length approach.
Evaluation of possibilities in identification and susceptibility testing for Candida glabrata clinical isolates with the Integral System Yeast Plus (ISYP)
- Piotr Szweda
- Katarzyna Magdalena Gucwa
- Łukasz Naumiuk
- Ewa Romanowska
- Katarzyna Dzierżanowska-Fangrat
- Anna Brillowska-Dabrowska
- Iwona Wojciechowska-Koszko
- Sławomir Milewski
2014 ACTA MICROBIOLOGICA ET IMMUNOLOGICA HUNGARICA
The aim of this study was to evaluate possibilities of correct identification and susceptibility testing of C. glabrata clinical isolates with Integral System Yeast Plus (ISYP). For species identification, as the reference method, API Candida test and species-specific PCR reactions were used. The potential of antifungal susceptibility testing by the ISYP test was compared with the Sensititre Yeast One. Whilst the reference methods confirmed that the received population (n = 65 isolates) represented only C. glabrata, identification with the ISYP system showed correct data only in the case of 18 strains tested (27.7%). Species identification of the other 47 strains with the ISYP test was not possible at all. Significant differences were also observed for drug susceptibility testing carried out by the ISYP and the Sensititre Yeast One. The highest level of disagreement in classifying strains as resistant or susceptible estimated, as 73.9% and 40.0%, was observed for itraconazole and amphotericin B, respectively. Satisfactory results were only obtained for 5-fluorocytosine with 93.8% agreement between both methods. In our opinion the idea of the ISYP system is certainly good. The combination of identification ability and drug susceptibility testing in one test is very important, especially from a clinical point of view. However, the current version of the ISYP has many disadvantages. We would like to encourage the manufacturer to make an effort and develop a new, more accurate version of the test.
Evaluation Of Single Pole Auto-Reclosing Effectiveness With Nonlinear Secondary Arc Model
- Jacek Klucznik
- Zbigniew Lubośny
- Krzysztof Dobrzyński
- Stanisław Czapp
2014
The paper discusses two evaluation methods of single pole auto-reclosing process effectiveness in HV transmission lines. Secondary arc current and recovery voltage results obtained by load flow calculation are compared to the results obtained by the time domain simulations. Moreover, a non-linear secondary arc implementation is presented. The authors indicate, that precise representation of secondary electric arc leads to more accurate results. Recommendations for line construction (i.e. earthing reactor installation) and line operation (i.e. prolongation of dead time during auto-reclosing) based on time domain simulations are less restrictive than resulting from the traditional approach.
Evaluation of sound event detection, classification and localization in the presence of background noise for acoustic surveillance of hazardous situations
- Kuba Łopatka
- Józef Kotus
- Andrzej Czyżewski
2014
An evaluation of the sound event detection, classification and localization of hazardous acoustic events in the presence of background noise of different types and changing intensities is presented. The methods for separating foreground events from the acoustic background are introduced. The classifier, based on a Support Vector Machine algorithm, is described. The set of features and samples used for the training of the classifier are introduced. The sound source localization algorithm based on the analysis of multichannel signals from the Acoustic Vector Sensor is presented. The methods are evaluated in an experiment conducted in the anechoic chamber, in which the representative events are played together with noise of differing intensity. The results of detection, classification and localization accuracy with respect to the Signal to Noise Ratio are discussed. The algorithms presented are part of an audio-visual surveillance system.
Evaluation of strength, deformability and failure mode of composite structural insulated panels
- Łukasz Smakosz
- Andrzej Tejchman-Konarzewski
2014 Pełny tekst MATERIALS & DESIGN
W pracy przedstawiono wyniki badań wytrzymałościowych na zginanie i ściskanie paneli kompozytowych CSIP. Panele składają się z 2 sztywnych okładzin cementowo-magnezjowych zbrojonych włóknem szklanym oraz miękkiego rdzenia ze styropianu. Panele charakteryzują się m.in. niskim ciężarem, szybkim i łatwym montażem oraz wysoką wytrzymałością, ognioodpornością, odpornością na korozję i izolacyjnością cieplną.
Evaluation of the photoprotective effect of ˇ-cyclodextrin on the emission of volatile degradation products of ranitidine
- Marzena Jamrógiewicz
- Bartosz Wielgomas
- Michał Strankowski
2014 Pełny tekst JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
The process of the photo-excitation of ranitidine hydrochloride (RAN) in a solid state makes visible changes to its colour and generates an unpleasant odour. The purpose of the present study was to observe the protective effects of ˇ-cyclodextrin (CD) complexation as well as the effect of the mixture of two stoichiometries 1:1 and 1:2 (RAN:CD, IC) on the photostability of samples in a solid state. Sam- ples of inclusion complexes (IC) and physical mixtures (PM) were prepared and irradiated for 48 h in a Suntest CPS+ chamber. Irradiated samples were analyzed using nuclear magnetic resonance (1H NMR), infrared spectroscopy (FT-IR), the differential scanning calorimetry method (DSC) and thermogravime- try analysis (TGA). Volatiles were monitored with the use of headspace-solid phase microextraction-gas chromatography–mass spectrometry (HS-SPME-GC–MS). The protective effect of CD was noticed with respect to IC, and also PM. Achieved photostabilization of complexed RAN against photodegradation could be explained due to either the inclusion of the furan part of RAN into the CD cavity as shown by the 1H NMR ROESY (rotation frame nuclear Overhauser effect spectroscopy) spectrum or the screening effect of CD. FT-IR spectra, DSC curves and microscope images of irradiated samples of protected RAN did not indicate any physical changes, such as phase transfer.
Evaluation of Wear Resistance of Ti alloys used for elements friction of knee endoprosthesis
- Beata Majkowska-Marzec
- Magdalena Jażdżewska
- Damian Miotke
- Emilia Wołowiec
- Andrzej Zieliński
2014 Solid State Phenomena
The paper presents research results of resistance to abrasive wear of titanium alloys: Ti6Al4V (commonly used) and Til3Nb13Zr (alloy of new generation) in association with polyethylene (UHMW-PE) predisposed for elements on pair of the knee endoprosthesis. The results were analysed from the point of possibility of an use of new generation titanium alloys as components of such implants. The tests of resistance to abrasive wear of selected kinematic pairs were conducted with the PT-3 tribometer in Ringer’s solution a constant load 2.0 kN, rotational speed of the rotating specimens (Ti13Nb13Zr and Ti6Al4V) 30 rev/min, and test duration 1 or 2 hrs.
Evidence for SrHo2O4 and SrDy2O4 as model J1- J2 zigzag chain materials
- A. Fennell
- V. Y. Pomjakushin
- A. Uldry
- B. Delley
- B. Prévost
- A. Désilets-Benoit
- A. D. Bianchi
- R. I. Bewley
- B. R. Hansen
- Tomasz Klimczuk
- R. J. Cava
- M. Kenzelmann
2014 Pełny tekst PHYSICAL REVIEW B
Neutron diffraction and inelastic spectroscopy is used to characterize the magnetic Hamiltonian of SrHo2O4 and SrDy2O4. Through a detailed computation of the crystal-field levels we find site-dependent anisotropic single-ion magnetism in both materials, and diffraction measurements show the presence of strong one-dimensional spin correlations.Our measurements indicate that competing interactions of the zigzag chain, combinedwith frustrated interchain interactions, play a crucial role in stabilizing spin-liquid type correlations in this series.
Evolution of Animats Following a Moving Target in an Artificial Ecosystem
- Joachim Erdei
- Borys Wróbel
2014
Many biological animals, even microscopically small, are able to track moving sources of food. In this paper, we investigate the emergence of such behavior in artificial animals (animats) in a 2-dimensional simulated liquid environment. These "predators" are controlled by evolving artificial gene regulatory networks encoded in linear genomes. The fate of the predators is determined only by their ability to gather food and reproduce—no subjective function is used to select the best individuals. Food is delivered to the environment by mobile animats who are not evolved ("prey"). Our results show promise for evolving more complex behavior relevant for nanorobotics, swarm robotics, and research on the evolution of simple cognitive abilities (minimal cognition).
Evolution of the nanostructure of Pt and Pt–Co polymer electrolyte membrane fuel cell electrocatalysts at successive degradation stages probed by X-ray photoemission
- Ali Mushtaq
- Agnieszka Witkowska
- Mamatimin Abbas
- Roberto Gunnella
- Andrea Di Cicco
2014 JOURNAL OF POWER SOURCES
We present a set of XPS (X-ray photoemission spectroscopy) measurements and detailed data-analysis of electrodes for polymer electrolyte membrane fuel cell (PEMFC) based on carbon supported catalysts (Pt and Pt–Co) subjected to a step-like potential cycling (accelerated degradation test). The results of the measurements complete and corroborate parallel TEM (transmission electron microscopy), XRD (X-ray diffraction) and XAS (X-ray absorption spectroscopy) results pointing at a modification of the nanostructure of the catalyst grains. The surface sensitivity of the XPS measurements is used to study the modification of the reactive surface structure of the nanoparticles and the interplay of reactivity and dissolution/precipitation/agglomeration of metal clusters during the catalyst work. The combination of XPS results with XRD, XAS and TEM ones allowed us to obtain a model for the structural changes in Pt–Co nanoparticles occurring during operation. The main structural modifications, in which predominantly Co atoms are involved, occur during the first hours of catalyst operation changing the stoichiometry and degree of disorder in external particles shell. In the last stages of the degradation process, core–shell particles structure, with ordered Pt4Co core and Pt-rich shell (and finally Pt-skin), is formed possibly explaining higher Pt–Co catalyst stability (structural and electrochemical) than pure Pt catalyst.
Evolutionary algorithm and decisional DNA for multiple travelling salesman problem
- Peng Wang
- Cesar Sanin
- Edward Szczerbicki
2014 NEUROCOMPUTING
In the real world, it is common to face optimization problems that have two or more objectives that must be optimized at the same time, that are typically explained in different units, and are in conflict with one another. This paper presents a hybrid structure that combines set of experience knowledge structures (SOEKS) and evolutionary algorithms, NSGA-II (Non-dominated Sorting Genetic Algorithm II), to solve multiple optimization problems. The proposed structure uses experience that is derived from a former decision event to improve the evolutionary algorithm’s ability to find optimal solutions rapidly and efficiently. It is embedded in a Smart Experience-based Data Analysis System (SEDAS) introduced in the paper. Experimental illustrative results of SEDAS application to solve a travelling salesman problem show that our new proposed hybrid model can find optimal or close to true Pareto-optimal solutions in a fast and efficient way.