2015 - Repozytorium publikacji - Politechnika Gdańska

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Data Acquisition in a Manoeuver Auto-negotiation System
- Joanna Szłapczyńska
2015 Pełny tekst TransNav - The International Journal on Marine Navigation and Safety of Sea Transportation
Typical approach to collision avoidance systems with artificial intelligence support is that such systems assume a central communication and management point (such as e.g. VTS station), usually located on shore. This approach is, however, not applicable in case of an open water encounter. Thus, recently a new approach towards collision avoidance has been proposed, assuming that all ships in the encounter, either restricted or open water, communicate with each other and negotiate their maneuvers, without involving any outer management or communication center. Usually the negotiation process is driven by the collision avoidance software and called auto-negotiation. This paper elaborates on data acquisition problem in case of the maneuver auto-negotiation. It focuses on ships' initialization in the system and data gathering.
Data visualization of marine objects on digital maps
- Bartosz Czaplewski
- Krzysztof Cwalina
- Sylwester Kaczmarek
- Ryszard Katulski
2015 Zeszyty Naukowe Akademii Marynarki Wojennej
The paper presents the implementation of two multithreaded applications for data visualization of marine objects written in C#, designed to run on operator consoles with 32-bit or 64-bit Windows 7 OS. The article describes the most important functionality and features of the developed C# .NET user controls for data visualization on digital maps and in the configurable tables.
Database for integration of information in distributed data exchange system elements of Border Guard
- Sylwester Kaczmarek
- Magdalena Młynarczuk
- Maciej Sac
2015 Zeszyty Naukowe Akademii Marynarki Wojennej
The paper presents the database solution for integration of information in distributed data exchange system elements of the Polish Border Guard. The proposed database solution is described in the context of data exchange system elements which control position and store identification data of vessels (fishing, sports and sailing boats) and other suspicious objects on the territorial sea, sea-coast and the internal sea-waters controlled by Maritime Polish Border Guard. The paper presents the general architecture of the data exchange system elements of Border Guard, the general MapServer architecture as a component of the Border Guard system. To explain the challenges being faced during implementation the conceptual model of database is also presented. Moreover main functionalities of database client and functional tests results are described.
DBpedia As a Formal Knowledge Base – An Evaluation
- Tomasz Maria Boiński
- Adrian Ambrożewicz
- Julian Szymański
2015 Pełny tekst WSEAS Transactions on Information Science and Applications
DBpedia is widely used by researchers as a mean of accessing Wikipedia in a standardized way. In this paper it is characterized from the point of view of questions answering system. Simple implementation of such system is also presented. The paper also characterizes alternatives to DBpedia in form of OpenCyc and YAGO knowledge bases. A comparison between DBpedia and those knowledge bases is presented.
DDQ-mediated synthesis of functionalized unsymmetrical disulfanes
- Mateusz Musiejuk
- Tomasz Klucznik
- Janusz Rachoń
- Dariusz Witt
2015 Pełny tekst RSC Advances
We developed a simple and efficient method for the synthesis of functionalized unsymmetrical disulfanes under mild conditions in good yields. The designed method is based on the reaction of bis(5,5- dimethyl-2-thioxo-1,3,2-dioxaphosphorinan-2-yl)disulfane with thiols in the presence of 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ). The developedmethod allows the preparation of unsymmetrical disulfanes bearing additional hydroxy, carboxy, or amino functionalities.
Dead-Time Effect Compensation Based on Additional Phase Current Measurements
- Arkadiusz Lewicki
2015 Pełny tekst IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
This paper proposes a new method of dead-time effect compensation. The proposed solution is based on additional phase current measurements realized by analog-to-digital converters. These measurements are carried out at the time instants speciﬁed by a pulsewidth-modulation (PWM) strategy. This makes it possible to estimate inverter currents at the commutation instants and, ﬁnally, to estimate the voltage error caused by dead time. This voltage error is compensated during the next switching period by modiﬁcation of a reference voltage. The proposed solution can be used to compensate the voltage error in multilevel multiphase voltage source inverters. The experimental research studies were carried out on three-phase two-level and three-level neutral-point-clamped inverters supplying 55- and 160-kW motors, respectively. The results of the experimental investigations are presented in this paper
Deduplication of Position Data and Global Identification of Objects Tracked in Distributed Vessel Monitoring System
- Jędrzej Hajduczenia
- Sylwester Kaczmarek
- Jarosław Sadowski
2015 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
Vessel monitoring systems (VMS) play a very important role in safety navigation. In most cases, their structure is distributed and they are based on two data sources, namely Automatic Identification System (AIS) and Automatic Radar Plotting Aids (ARPA). Such approach results in several objects identification and position data duplication problems, which need to be solved in order to ensure the correct performance of a given VMS. The problems' genesis and the concept of solution are described in the paper. Examples of decisions made on the basis of proposed algorithms are also presented.
Deduplication of Tracked Objects Position Data at Single Observation Point of a Vessel Monitoring System
- Jędrzej Hajduczenia
- Sylwester Kaczmarek
- Jarosław Sadowski
2015 Zeszyty Naukowe Akademii Marynarki Wojennej
Vessel Monitoring System (VMS) play a major role in safety navigation. In most cases they are based on two data sources, namely Automatic Identification System (AIS) and Automatic Radar Plotting Aids (ARPA). Integration of data obtained from these sources is an important problem, which needs to be solved in order to ensure the correct performance of a given VMS. In this paper basic functions which should be implemented in a tracked objects position data deduplication module are described. An example based on their practical implementation is also presented.
Deformation of the Structural Details of the Components Created by the Rapid Prototyping Method
- Stefan Dzionk
2015 Solid State Phenomena
The paper present the results of preliminary research and describes the deformation of construction details within the process of producing small element employing a stereography system. The article discuses a scheme for changes in data conversion. Variation in construction details have been described on the basis of analysing photographs.
Degradacja sztywności słupów budynku na skutek działania pionowego obciążenia uderzeniowego w czasie wstrząsów sejsmicznych
- Wojciech Migda
- Robert Jankowski
2015
Celem niniejszego artykułu jest przedstawienie wyników badań dotyczących zachowania się słupów budynku poddanych deformacji poziomej (skutek działania sił sejsmicznych) oraz jednocześnie pionowemu obciążeniu uderzeniowemu (skutek awarii tzw. słabego piętra) podczas wstrząsów sejsmicznych. Wyniki badań pokazują, iż degradacja sztywności słupów na skutek działania obciążenia uderzeniowego może mieć zasadnicze znaczenie prowadząc do zwiększenia odpowiedzi całego budynku w czasie trzęsienia ziemi. Wyniki badań wskazują również, iż moment, w którym nastąpi uderzenie odgrywa bardzo istotną rolę. Największego wzrostu odpowiedzi konstrukcji można spodziewać się, jeżeli uderzenie nastąpi w momencie maksymalnej deformacji poziomej słupów.
Degradation of electrical performance of a crystalline photovoltaic module due to dust deposition in northern Poland
- Ewa Klugmann-Radziemska
2015 Pełny tekst RENEWABLE ENERGY
The reduction in power output caused by the accumulation of dust on the photovoltaic module surface is an important problem and should receive much more attention in the literature. This study was an evaluation of the performance degradation of crystalline photovoltaic modules due to natural and simulated dust deposition. Dust is created from powdered grains of sand and particles of different bodies. Dust originates from different sources, e.g. from the soil and volcanic eruptions. Dust in the air is an aerosol, and in high concentrations can cause climate change. Deposition of airborne dust on photovoltaic modules may decrease the transmittance of solar cell glazing and cause a significant degradation in the solar conversion efficiency of photovoltaic modules. Dust deposition is closely related to the tilt angle of the module, the exposure period, site climate conditions, wind movement and dust properties. In this article, a brief review of the energy yield losses caused by dust deposition on photovoltaic modules and the results of experimental research conducted in Poland are presented. Dust samples were collected after a few years of natural and artificial dust deposition. The reduction in efficiency had a linear relationship with the dust deposition density.
Degradibility in vitro of polyurethanes based on synthetic atactic poly[)R,S)-3-hydroxybutyrate
- Joanna Brzeska
- Henryk Janeczek
- Helena Janik
- Marek Kowalczuk
- Maria Rutkowska
2015 Pełny tekst Polimery
The aim of the paper was to determine the degradibility of aliphatic polyurethanes in hydrolytic and oxidative solutions. DSC, GPC, density, polymer surface morphology were studied.
DEM analysis of micro-structural events within granular shear zones under passive earth pressure conditions
- Michał Nitka
- Andrzej Tejchman-Konarzewski
- Jan Kozicki
- Danuta Leśniewska
2015 Pełny tekst GRANULAR MATTER
W artykule omówiono wyniki obliczeń numerycznych dla pasku dla stanu pasywnego sztywnej ścianki podczas jej translacji stosując metodę elementów dyskretnych. Analizowano głównie zjawiska mikrostrukturalne w strefach ścinania podczas translacji sztywnej ścianki. Szczególna uwagę zwrócono na pojawienie się wirów w materiale granulowanym.
Demographic Changes in Poland – The Regional Dimension
- Anita Richert-Kaźmierska
2015 Pełny tekst EQUILIBRIUM Quarterly Journal of Economics and Economic Policy
The article notes that the ageing process does not occur uniformly across all Polish regions, i.e. at the same pace and with the same intensity. The results of studies indicating the regions being most vulnerable to the ageing of the regional community and the negative consequences of this process in the next two decades are presented.
Deposition and characterization of organic polymer thin films using a dielectric barrier discharge with different C2Hm/N2 (m = 2, 4, 6) gas mixtures
- Thejaswini Chandrashekaraiah
- Robert Bogdanowicz
- Vladimir Danilov
- Jan Schäfer
- Jürgen Meichsner
- Rainer Hippler
2015 EUROPEAN PHYSICAL JOURNAL D
Organic polymer thin films have been deposited on Si(100) and aluminum coated glass substrates by a dielectric barrier discharge (DBD) operated at medium pressure using different C2Hm/N2 (m = 2, 4, 6) gas mixtures. The deposited films were characterized by various spectroscopic techniques. Fourier transform infrared reflection absorption spectroscopy (FT-IRRAS) revealed the chemical functional groups present in the films. The surface chemical compositions have been derived from X-ray photo electron spectroscopy (XPS). FT-IRRAS and XPS show the presence of sp, sp2 and sp3 bonds of carbon and nitrogen. Various functional groups such as NH containing, saturated and unsaturated alkyl groups have been identified. Thin films obtained from C2H2/N2 and C2H4/N2 gas mixtures revealed a higher N/C ratio when compared to thin films obtained from C2H6/N2. Thickness, refractive index and extinction coefficient were evaluated by spectroscopic ellipsometry (SE). Significant differences between the films obtained with different gas mixtures are observed.
Deposition and growth of thin ceramic films
- Aleksander Chrzan
- Dagmara Grudzień
- Jakub Karczewski
2015
: Thin ceramic films play an important role in modern technology. One of the more utilized methods of deposition of ceramic films is spin coating. In this paper we investigate optimal deposition parameters for LaNi0.6Fe0.4O3−δ thin layers spin coated from a polymeric precursor. The quality of the obtained layers is checked using scanning electron microscopy. Additionally, we investigate the growth of grains in ceramic films annealed at different temperatures. Sample morphology is determined by atomic force microscopy. We also compare LaNi0.6Fe0.4O3−δ grain growth with La0.6Sr0.4Co0.2Fe0.8O3−δ. Moreover, a review of basic coating methods is presented.
Derywatyzacja analitów- sposób na poprawę skuteczności procesu rozdzielania chromatograficznego
- Justyna Płotka-Wasylka
- Calum Morrison
- Marek Biziuk
- Jacek Namieśnik
2015 Analityka: Nauka i Praktyka
Wiele badanych związków nie wykazuje takich właściwości, aby możliwe było ich oznaczanie przy użyciu technik chromatograficznych sprzężonych z danym typem detekcji, dlatego też konieczne staję się przeprowadzenie analitów w odpowiednie pochodne o pożądanych właściwościach umożliwiających ich oznaczenie, czyli przeprowadzenie tak zwanego procesu derywatyzacji.
Design and evaluation of a base module of active power electronic transformer
- Indrek Roasto
- Victor Minambres-Marcos
- Enrique Romero-Cadaval
- Ryszard Strzelecki
2015
This paper presents an active power electronic transformer (APET) based on modular structure. The proposed three phase APET consists of at least three base modules (BM). The input/output stage of the BM is based on half-bridge sub modules. The isolation stage includes a medium frequency transformer and is realized as a dual half-bridge. The paper describes construction process and explains the control strategy. The theoretical principles are verified by the experimental results.
Design and modeling of the piezoelectric motor based on three resonance actuators
- Roland Ryndzionek
- Michał Michna
- Mieczysław Ronkowski
- Jean-Francois Rouchon
2015
This paper describes a piezoelectric motor which combines advantages from two existing piezoelectric motors topologies. The research work presents the design, simulations and measurements of the piezoelectric motor with three rotation-mode actuators. The aim of the project was to obtain the high speed piezoelectric motor. Other advantages of this conception are blocking torque, short response times, the ability to work in a hostile environment and quiet operation. In the paper a simulations and measurements of the resonance frequencies has been presented, and finally the real model measurements has been done. The purpose of those efforts was to develop a new actuator dedicated for the embedded applications.
DESIGN AND STRENGTH CALCULATIONS OF THE TRIPOD SUPPORT STRUCTURE FOR OFFSHORE POWER PLANT
- Czesław Dymarski
- Paweł Dymarski
- Jędrzej Żywicki
2015 Pełny tekst Polish Maritime Research
The support structure being the object of the analysis presented in the article is Tripod. According to the adopted assumptions, it is a foundation gravitationally set in the water region of 60 m in depth, not fixed to the seabed, which can be used for installing a 7MW wind turbine. Due to the lack of substantial information on designing and strength calculations of such types of structures in the world literature, authors have made an attempt to solve this problem within the framework of the abovementioned project. In the performed calculations all basic loads acting on the structure were taken into account, including: the self mass of the structure, the masses of the ballast, the tower and the turbine, as well as hydrostatic forces, and aero- and hydrodynamic forces acting on the entire object in extreme operating conditions.