2013 - Repozytorium publikacji - Politechnika Gdańska

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Control design for slow speed positioning
- Anna Witkowska
2013
The problem under study is a synthesis of position and heading control system for low frequency model of surface vessel described by 3 DOF mathematical model. The recursive vectorial backstepping control design was used to keep fixed position and heading in presence of wave disturbances. The controller has been simulated on computer model of scaled supply vessel. It has been assumed that the actuators produce generalized forces in all 3 degrees of freedom. The backstepping controller, proposed in this paper, in configuration with passive observer and wave filtering, make a good quality to keep fixed position and heading at low forward speed in comparison with PD controller.
Control strategy for the multilevel cascaded H-bridge converter
- Arkadiusz Lewicki
- Marcin Morawiec
2013
The paper presents the control strategy for Cascaded H-bridge (CHB) converter . The converter output voltage using Space-Vector Pulse Width Modulation (SV-PWM) strategy is controlled. The DC-link voltages are controlled by appropriate choice of H-Bridges and appropriate choice of active and passive vectors.
Control System Design for Dynamic Positioning using Vectorial Backstepping
- Anna Witkowska
2013 Pełny tekst Zeszyty Naukowe Akademii Morskiej w Szczecinie
The problem of synthesis a dynamic positioning system for low frequency model of surface vessel was considered in this paper. The recursive vectorial backstepping control design was used to keep a fixed position and heading in presence of wave disturbances. The passive observer was introduced to smooth the measurements and to estimate the velocities needed for the control algorithm. The computer simulation results were given to demonstrate the effectiveness of that combination of controller-observer system to compensate environmental disturbances.
Convenient identification of desulfoglucosinolates on the basis of mass spectra obtained during liquid chromatography-diode array-electrospray ionisation mass spectrometry analysis: Method verification for sprouts of different Brassicaceae species extracts
- Barbara Kusznierewicz
- Renato Iori
- Anna Piekarska
- Jacek Namieśnik
- Agnieszka Bartoszek-Pączkowska
2013 Pełny tekst JOURNAL OF CHROMATOGRAPHY A
Over the past decade, glucosinolates (GLs) present in different tissues of Brassicaceae and their breakdown products, especially isothiocyanates formed after myrosinase catalyzed hydrolysis, have been regarded as not only environment friendly biopesticides for controlling soilborne pathogens, but most importantly as promising anticarcinogenic compounds. For these reasons, the identification and quantitative determination of the content of individual glucosinolates in plant material is of great interest. Among the different analytical approaches available today for determining GLs in brassica plant samples, HPLC analysis of their desulfo derivatives (DS-GLs) according to ISO 9167-1, 1992, method is the most widely used. However, the notorious lack of commercially available standards limits its usefulness. To overcome these limitations, liquid chromatography-electrospray ionisation-mass spectrometry was investigated as a potential method for the identification of DS-GLs. The characteristic pattern of fragmentation eitherin positive or negative ionisation was established based on mass spectra of 11 DS-GL standards, then proposed for additional over 30 most common desulfated GLs. The applicability of MS detection of DS-GLs was verified for real plant samples, the extracts of 14 kinds of brassica sprouts. The results indicated that this methodology combines a convenient identification of DS-GLs with the well established analytical procedure preferred by many researchers. Thus, incorporation of MS detection into popular ISO method seems to result in an improved and more reliable approach to GLs determination.
Copper(II) complexes with substituted imidazole and chlorido ligands: X-ray, UV-Vis, magnetic and EPR studies and chemotherapeutic potential
- Sylwia Godlewska
- Julia Jezierska
- Katarzyna Kazimierczuk
- Ewa Augustin
- Anna Dołęga
2013 POLYHEDRON
Crystal structures, UV-Vis and EPR spectra and magnetic properties of four copper(II) complexes with chloride anions and 4-methylimidazole, 2-ethylimidazole, 2-isopropylimidazole or 2-ethyl-4-methylimidazole are described. In the solid state three of the complexes are mononuclear and one complex with 2-ethylimidazole is binuclear with bridging chlorido ions. UV-Vis spectra of the methanolic solutions of the complexes show LMCT bands characteristic for the presence of Cu-N(imidazole) and Cu-Cl coordination bonds. The visible part of the UV-Vis spectrum indicates that in solution the complexes adopt similar geometries. Powdered compounds exhibit anisotropic X-band EPR spectra: axial for complexes with 4-methylimidazole and 2-ethyl-4-methylimidazole and rhombic for the complex with 2-isopropylimidazole. Spin-spin interaction between Cu(II) ions in the binuclear complex with 2-ethylimidazole has mainly dipole-dipole character. In frozen methanol solutions the EPR spectra of all studied complexes prove similar axial symmetry of the coordination polyhedra. The results of cytotoxicity tests of the complexes against U937 lymphoma show comparable, moderate antineoplastic activity of the tested compounds.
CoRBAC – kontekstowo zorientowany model bezpieczeństwa
- Henryk Krawczyk
- Paweł Lubomski
2013 Studia Informatica Pomerania
Zaproponowano uogólniony model kontroli dostępu do usługowych systemów internetowych uwzględniający różne kategorie kontekstu. Określono wpływ kontekstu na model jak i architekturę systemu bezpieczeństwa. Podano przykład implementacji modelu i architektury bezpieczeństwa dla zestawu usług dotyczących e-uczelni i wstępnie oszacowano zalety takiego rozwiązania.
Corporate social responsibility in reference to environmental statements within EMAS system in small and medium enterprises
- Małgorzata Wiśniewska
- Piotr Grudowski
2013
According to the corporate social responsibility concept, organisations should apply any mechanisms available supporting their business actions contributing i.e. to the improvement of natural environment. Among them is EMAS eco-management and audit scheme. The prove of its implementation is environmental statement and entering the organisation into a national EMAS register. The aim of the statement is informing the society and other interested parties about the achievements and effects of activity in the field of environmental protection and building a positive image of an organisation. The aim of the research was to analyse the contents of environmental statements of eight SMEs entered into the national EMAS register in Poland in reference to the compliance with minimum requirements described in Regulation (EC) No 1221/2009 of the European Parliament and of the Council. A modified Kolman method has been used for assessment and analysis. The results of the research proved that analysed statements significantly differ from one another. Some of them are very simple, other too complex with the content concealing the general meaning of the statement. Discrepancies, lack of clear descriptions, no reference to given requirements and no evidence in a form of definite results are noticed.
Corrosion monitoring by harmonic analysis in aqueous environments
- Juliusz Orlikowski
- Sebastian Łubiński
- Paweł Żuchowski
2013 Ochrona przed Korozją
This paper presents tests concerning the rate of corrosion in non-alloy steel (type S235JR) in an aqueous environment, with an additive of sodium chloride by means of polarization resistance measurements and harmonic analysis. The tests have been carried out for steel samples exposed to the testing environment for six weeks, in order to obtain a constant rate of corrosion in the function of time. The measurements have aimed at verifying the use of harmonic analysis in automatic corrosion monitoring systems. For this purpose, a typical three-electrode sensor, which is applied to measurements taken by means of automatic corrosion monitoring systems, has been used. In conclusion, the tests have revealed that harmonic analysis can be a measurement method to be applied in the design of corrosion monitoring systems.
Cost assessment of computer security activities
- Rafał Leszczyna
2013 Computer Fraud & Security
Comprehensive cost-benefit analysis plays a crucial role in the decision-making process when it comes to investments in information security solutions. The cost of breaches needs to be analysed in the context of spending on protection measures. However, no methods exist that facilitate the quick and rough prediction of true expenditures on security protection systems. Rafal Leszczyna of Gdansk University of Technology presents a novel method for evaluating the cost of computer security activities and tests it against a real-world example.
Coupled elasto-plastic-damage model with non-local softening enhanced by viscosity to describe dynamic concrete behaviour
- Ireneusz Marzec
- Andrzej Tejchman-Konarzewski
2013
W artykule zaproponowano model do opisu betonu podczas dynamicznego obciążenia. Przyjęto model sprężysto-plastyczny z degradacją sztywności i nielokalnym osłabieniem rozszerzony o lepkość. Obliczenia MES dla elementów betonowych pod obciążeniem dynamicznym o różnej prędkości obciążenia porównano z doświadczeniami.
Creating Dynamic Maps of Noise Threat Using PL-Grid Infrastructure
- Maciej Szczodrak
- Józef Kotus
- Bożena Kostek
- Andrzej Czyżewski
2013 Pełny tekst Archives of Acoustics
The paper presents functionality and operation results of a system for creating dynamic maps of acoustic noise employing the PL-Grid infrastructure extended with a distributed sensor network. The work presented provides a demonstration of the services being prepared within the PLGrid Plus project for measuring, modeling and rendering data related to noise level distribution in city agglomerations. Specific computational environments, the so-called domain grids, are developed in the mentioned project. For particular domain grids, specialized IT solutions are prepared, i.e. software implementation and hardware (infrastructure adaptation), dedicated for particular researcher groups demands, including acoustics (the domain grid “Acoustics”). The infrastructure and the software developed can be utilized mainly for research and education purposes, however it can also help in urban planning. The engineered software is intended for creating maps of noise threat for road, railways and industrial sources. Integration of the software services with the distributed sensor network enables automatic updating noise maps for a specific time period. The unique feature of the developed software is a possibility of evaluating auditory effects which are caused by the exposure to excessive noise. The estimation of auditory effects is based on calculated noise levels in a given exposure period. The outcomes of this research study are presented in a form of the cumulative noise dose and the characteristics of the temporary threshold shift.
Creating dynamic maps of noise threat using pl-grid infrastructure; materiały konferencyjne
- Maciej Szczodrak
- Józef Kotus
- Bożena Kostek
- Andrzej Czyżewski
2013
This paper presents functionality and operation results of the system for creating dynamic maps of noise thread with the use of the PL-Grid infrastructure integrated with distributed sensors network for measuring, modeling and rendering noise level distribution. The work presented provides a demonstration of the services being prepared within the PLGrid Plus project. Specific computational environments, so called domain grids, are developed in the mentioned project. For particular domain grids, specialized IT solutions are prepared, i.e. dedicated software implementation, and hardware (infrastructure adaptation), suited for particular researchers’ groups demands, including acoustics (domain grid “Acoustics”). 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 road, railways and industrial sources. Integration of the software service with distributed sensor network enables to automatically update noise maps for a specific time period. The unique feature of the developed software is a possibility to estimate auditory effects which are caused by the exposure to noise. The estimation of auditory effects is based on calculated noise levels and on a given exposure period. The outcomes of this research study are presented in a form of the cumulative noise dose and characteristics of the temporary threshold shift.
Critical review of propeller performance scaling methods based on model experiments and numerical calculations
- Tomasz Bugalski
- Jan Szantyr
- Heinrich Streckwall
2013 Pełny tekst Polish Maritime Research
The article presents the results of experimental and theoretical investigation of propeller scale effects. The objective of this investigation is to test the adequacy of the methods currently used and to develop possible improvement of the methods.New approaches to the problem and new procedures to account for the propeller scale effects are suggested. The description of the underlying experimental and theoretical research is included.
Cross section calculations for electron scattering from platinum chemotherapeutic compounds
- Bożena Żywicka
- Paweł Możejko
2013 The European Physical Journal-Special Topics
Cross section for electron impact ionization of carboplatin, C6H12N2O4Pt, and oxaliplatin, C8H14N2O4Pt, have been calculated within binary-encounter-Bethe model for energies from the ionization threshold up to 5000 eV. Cross section for elastic electron scattering from carboplatin and oxaliplatin molecules have also been derived using independent atom method (IAM) and additivity rule for collision energies ranging from 50 eV to 3000 eV. Obtained cross sections have been compared with relevant cross sections for cisplatin molecules.
Cross-border Cooperation Local Governments in the Euroregion Baltic
- Krystyna Gomółka
2013
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Cross-border cooperiation between nongovernmental organisations in the Pomeranian and Warmian-Masurian voivodeships
- Krystyna Gomółka
2013 Pełny tekst Baltijskij region
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CROWDSOURCING A KOMUNIKACJA Z KONSUMENTAMI
- Magdalena Brzozowska-Woś
2013
Rozdział prezentuje wybrane modele komunikacji w Internecie oraz crowdsourcing jako nową metodę pozyskiwania pomysłów i informacji od konsumentów. W ciągu ostatnich 5 lat rozwój technologii komunikacyjnych znacząco zmienił sposób komunikowania się ludzi, a w konsekwencji również organizacji z konsumentami. Nie tylko firmy z branży IT mogą wzmocnić swoją markę, reputację oraz zwiększyć przychody dzięki opracowaniu atrakcyjnej, społecznie odpowiedzialnej obecności w Sieci. Organizacje łączą crowdsourcing z tradycyjnymi narzędziami komunikacji, aby pomóc klientom zamienić dobre pomysły w konkretne działania. Konsumentom łatwiej jest znaleźć informacje na temat kampanii crowdsourcingowych, ponieważ dzięki Internetowi zniknęły trudności w dostępie do nich.
CSR in Polish SMEs from the Women Perspective
- Magdalena Popowska
2013
This paper presents the implementation of the CSR approach among Polish small and medium enterprises, taking into account gender issues. It offers also a kind of evaluation of the national context of women entrepreneurship combined with a wider and deeper analysis of the CSR solutions that may be adressed to both, women, workers and women entrepreneurs.
CURRENT TRENDS IN RECYCLING OF PHOTOVOLTAIC SOLAR CELLS AND MODULES WASTE
- Ewa Klugmann-Radziemska
2013 Pełny tekst Chemistry-Didactics-Ecology-Metrology
In comparison to other energy producing techniques, photovoltaics (PV) is one of the most promising options: no emission of any matter into the environment during operation; extremely long operation period (estimated average: 25 years), minimum maintenance, robust technique, aesthetic aspects. The use of photovoltaics is rapidly increasing, and the respective market is developing accordingly. Although PV manufacturing equipment is now excluded from the scope of RoHS, according to the Kyoto Protocol and the EU Directives WEEE and RoHS the use of hazardous substances in electric/electronic devices has to be reduced stepwise to approximately zero level. Furthermore, a total recycling of nearly all materials involved is aimed. Thus, major attention is directed to avoidance of environmental pollution through combustion or landfill, to regain valuable material, to promote the development and use of renewable energy sources. As the lifetime of PV cells themselves is much longer than that of PV modules and the manufacturing process of cells requires much energy consumption, the reuse of base material of the cells is economically justified. The aim of this work was to develop and evaluate existing methods of PV cells and modules recycling. The article discusses the main outcomes and analyses the significance of recycling in relation to the environmental profile of the production and total life cycle of photovoltaic cells and modules.
Cyfrowe pomiary prędkości maszyn
- Wojciech Blacharski
2013 Chemia Przemysłowa
Artykuł dotyczy wykorzystania cyfrowych pomiarów prędkości dla celów utrzymania ruchu parku maszynowego w zakładach produkcyjnych. Porównano właściwości trzech sposobów pomiaru realizowanego za pomocą enkoderów i systemów komputerowej akwizycji danych DAQ, w tym: poprzez zliczanie częstotliwości impulsów z enkodera, poprzez zliczanie okresu impulsów z enkodera, poprzez rewersyjne zliczanie zmian położenia z bieżącym, numerycznym przeliczaniem wyników na prędkość. Przedstawiono przykładowe schematy układów licznikowych stosowanych w systemach DAQ do realizacji tych sposobów. Opisane sposoby pomiaru mogą byc wykorzytsane w następujących obszarach zastosowań: sterowanie pracą napędów, diagnostyka maszyn i procesów, rejestracja czasu pracy i wydajności dla oceny efektywności wykorzystania maszyn.