2014 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2014

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Classifying the transformation products (TPs) of emerging contaminants (ECs) for prioritizing research into their impact on the environment and human health
- Jacek Namieśnik
- Lidia Wolska
- Radosław Czernych
- Grażyna Gałęzowska
- Monika Cieszyńska
2014
One of the first books to cover transformation products, rather than primary compounds, Transformation Products of Emerging Contaminants in the Environment gathers, specifies, synthesizes, and advances existing knowledge of the most important transformation product (TPs) of the main groups of emerging contaminants with potential concern to human health and the environment. This two-volume set for researchers and professionals covers the sources of TPs of emerging contaminants and their environmental behavior, their occurrence and effects on urban and marine environments, risk assessment and management, and technologies and strategies available for control.
Cloud solutions as a platform for building advanced learning platform, that stimulate the real work environment for project managers
- Sebastian Wilczewski
2014 Pełny tekst
Improving skills of managers and executives require, that during the transfer of knowledge (in different ways: during studies, trainings, workshops and other forms of education) it is necessary to use tools and solutions that are (or will be) used in real world environments, where people being educated are working or will work. Cloud solutions allow educational entities (universities, training companies, trainers, etc.) to provide advanced IT solutions, which reflect actual or future work environment of trained managers, regardless of the level of complexity of the environment. It is alternative for on-premise installation. The purpose of this chapter, is to analyze the capabilities of cloud solutions, their suitability for building workshop environment (reflecting real, business IT environments), and the ability to use these solutions in distributed environments (geographically spread and international groups). It will be made on example of two cloud services: Project Online and Office 365, which could provide a platform for build workshop to develop competencies related to the management of projects and programs for future project, program and portfolio managers.
Coacervative extraction as a green technique for sample preparation for the analysis of organic compounds
- Alma Melnyk
- Lidia Wolska
- Jacek Namieśnik
2014 JOURNAL OF CHROMATOGRAPHY A
One of the present trends in analytical chemistry is miniaturization, which is one of the methods of green analytical chemistry application. A particular emphasis is placed on the elimination of the use of large amounts of organic solvents which are toxic and harmful to the environment, maintaining high efficiency of the extraction process, high recovery values and low values of quantification (LOQ) and detection (LOD) limits. These requirements are fulfilled by coacervative extraction (CAE) technique. In this review, theoretical aspects of the coacervation process are presented along with environmental and bioanalytical applications of this technique, its advantages, limitations and competitiveness with other techniques. Due to its simplicity and rapidity, CAE is an excellent alternative for currently practiced procedures of sample preparation for the analysis of organic compounds.
Cognitive memory for intelligent systems of decision-making, based on human psychology
- Zdzisław Kowalczuk
- Michał Czubenko
2014 Advances in Intelligent Systems and Computing
A model of memory, which allows to expand the functionality of autonomous decision-making systems for robotic and human-system-interface purposes, is discussed. The model provides functions and features which make the prospective robotic and interfacing systems more human-like as well as more efficient in solving interactive issues.
Cognitive memory for intelligent systems of decision-making, based on human psychology
- Zdzisław Kowalczuk
- Michał Czubenko
2014
A model of memory, which allows to expand the functionality of autonomous decision-making systems for robotic and human-system-interface purposes, is discussed. The model provides functions and features which make the prospective robotic and interfacing systems more human-like as well as more efficient in solving interactive issues.
Cognitive network model dedicated to transport system telematics
- Małgorzata Gajewska
2014 Archives of Transport System Telematics
The paper defines the concept of cognitive radio, in the context of transport systems, with particular emphasis on modern ecological concept of “green cognitive radio”. In addition, in the paper a modified cognitive network model dedicated to transport system telematics is proposed and presented. Algorithms to support the functioning of the cognitive radio are discussed. Sensors necessary to use the network to support cognitive functioning of transport system telematics are defined. The use of cognitive networks in transport is proposed.
Collision-Free Network Exploration
- Jurek Czyzowicz
- Dariusz Dereniowski
- Leszek Gąsieniec
- Ralf Klasing
- Adrian Kosowski
- Dominik Pająk
2014
A set of mobile agents is placed at different nodes of a n-node network. The agents synchronously move along the network edges in a collision-free way, i.e., in no round may two agents occupy the same node. In each round, an agent may choose to stay at its currently occupied node or to move to one of its neighbors. An agent has no knowledge of the number and initial positions of other agents. We are looking for the shortest possible time required to complete the collision-free network exploration, i.e., to reach a configuration in which each agent is guaranteed to have visited all network nodes and has returned to its starting location. We first consider the scenario when each mobile agent knows the map of the network, as well as its own initial position. We establish a connection between the number of rounds required for collision-free exploration and the degree of the minimum-degree spanning tree of the graph. We provide tight (up to a constant factor) lower and upper bounds on the collision-free exploration time in general graphs, and the exact value of this parameter for trees. For our second scenario, in which the network is unknown to the agents, we propose collision-free exploration strategies running in O(n^2) rounds for tree networks and in O(n^5 log(n)) rounds for general networks.
Color-based Detection of Bleeding in Endoscopic Images
- Adam Brzeski
2014 Pełny tekst International Journal of Innovative Research in Computer and Communication Engineering
In this paper a color descriptor designed for bleeding detection in endoscopic images is proposed. The development of the algorithm was carried out on a representative training set of 36 images of bleeding and 25 clear images. Another 38 bleeding and 26 normal images were used in the final stage as a test set. All of the considered images were extracted from separate endoscopic examinations. The experiments include color distribution analysis in RGB and HSV color spaces, measured over the training set. Next, the color descriptor based on the statistics of pixel values is introduced. The main idea behind the algorithm is to measure the ratios of bleeding and non-bleeding cases for each pixel color value appearing in the training set. Two variants of the descriptor are proposed, first dedicated for exact blood color detection, and second, more lenient, for identifying colors close to bleeding. The experimental evaluation lead to satisfactory results, surpassing the values anticipated basing on the theoretical considerations that were conducted earlier.
Combined operation of 900MW power plant with the ORC through the bleed steam extraction point and CO2 recovery system
- Dariusz Mikielewicz
- Paweł Ziółkowski
- Jan Wajs
- Jarosław Mikielewicz
2014
The work presented here is aimed at utylisation of waste heat in the reference supercritical power plant in the manner to produce electricity in ORC installation. The waste heat is available in the form of a stream of hot water at 90 C, recovered from the exhaust gases in the amount of 200MW. Such low enthalpy heat source is rather insufficient to produce a good quality vapour to feed the ORC turbine. Therefore an original approach to increase temperaturę of the vapour of ORC working fluid at the inlet to the turbine has been proposed through the use of heat from the bleed steam from the low-pressure part of the steam turbine of the reference power plant. Additionally the system uses heat from the CO2 capture installation. Analysis was accomplished using the Aspen Plus numerical code. Investigated were six working fluids such as propane, izobutane, pentane, ethanol, R236ea and R245fa. In the course of calculations determined were primarily the increase of the unit power and efficiency for the reference case and that with the ORC.
Comment on "Quantitative comparison of analysis methods for spectroscopic optical coherence tomography"
- Maciej Kraszewski
- Michał Trojanowski
- Marcin Strąkowski
2014 Biomedical Optics Express
In a recent paper by Bosschaart et al. [Biomed. Opt. Express 4, 2570 (2013)] various algorithms of time-frequency signal analysis have been tested for their performance in blood analysis with spectroscopic optical coherence tomography sOCT). The measurement of hemoglobin concentration and oxygen saturation based on blood absorption spectra have been considered. Short time Fourier transform (STFT) was found as the best method for the measurement of blood absorption spectra. STFT was superior to other methods, such as dual window Fourier transform. However, the algorithm proposed by Bosschaart et al. significantly underestimates values of blood oxygen saturation. In this comment we show that this problem can be solved by thorough design of STFT algorithm. It requires the usage of a non-gaussian shape of STFT window that may lead to an excellent reconstruction of blood absorption spectra from OCT interferograms. Our study shows that sOCT can be potentially used for estimating oxygen saturation of blood with the accuracy below 1% and the spatial resolution of OCT image better than 20mm.
Common-Mode Voltage and Bearing Currents in PWM Inverters: Causes, Effects and Prevention
- Jarosław Guziński
2014
In modern induction motor drives an increase of transistors' switching frequency and a decrease of switching times are the sources of some serious problems. The high dv/dt and the common mode voltage generated by the inverter PWM control results in the appearances of bearing currents, shaft voltages, motor terminal overvoltages, the decrease of motor efficiency, and electromagnetic interference. The aspects of common mode (CM) voltage and current in voltage source inverters and ac motors are illustrated in the chapter. The generation of CM voltages is a result of PWM operation of the inverter and is further explained. A CM motor equivalent circuit is analyzed and emphasis is placed on the bearing currents (their types and briefed description are listed). Some aspects of CM current limitation, especially the CM choke, are presented. A simple motor CM model is presented and the method for motor CM parameters determination is included. A significant part of the chapter is dedicated to the active methods for CM currents limitation based on PWM modifications.
Communication Networks in the Service of the Environmental Monitoring
- Sławomir Ambroziak
- Ryszard Katulski
- Jacek Namieśnik
- Jarosław Sadowski
- Jacek Stefański
- Waldemar Wardencki
2014
In the paper selected issues relating to communication networks in the services of the environmental monitoring (EM) have been described. It is divided into three main parts: introduction, wire and wireless networks. At the beginning of the basic definitions were explained. The wire part focuses on a plain old telephone service (POTS), an integrated services digital network (ISDN), a digital subscriber line (DSL) and a fiber-optic technology (FOT). On the other hand, the wireless part focuses on short-range wireless networks, cellular networks and satellite networks. Finally, the last section concludes the paper. The advantages and disadvantages of both solutions (wire and wireless) for EM pplication have been presented.
Compact satellite hydraulic unit
- Paweł Śliwiński
- Piotr Patrosz
2014 Mechines Technologies Materials
The article describes the design and operation of a prototype hydraulic unit. It is based on an inversed kinematics, satellite pump in which the body rotates around the shaft. The pump is placed inside the electric motor. Thanks to that the compact and low mass construction was achieved. Thanks to new commutation unit with enlarged channels, lower pressure losses were obtained. The article presents the construction and results of preliminary tests.
Comparative analysis of balancing of V6 engines with common- and split-pin crankshafts
- Ryszard Mosakowski
2014 Pełny tekst Combustion Engines
An analysis of balancing of V6 engines equipped with split-pin crankshafts with any cylinder bank angle based on the mathematical relations derived in the paper was carried out. A comparison of the quality of their balancing with engines equipped with common-pin crankshafts was also carried out. The bank angle ranges beneficial for balancing of moments of inertia forces in reciprocating motion were determined. A mathematical relation on the optimum value of the main counterweights in the function of the cylinder bank angle was derived as well. The advantages of the split-pin crankshafts from the point of view of balancing were indicated also.
Comparative Analysis of Contemporary Regeneration of Waterfronts in Port Cities
- Piotr Lorens
2014
The paper includes comparative analysis of the selected waterfront case studies in cities around Europe and North America.
Comparative Analysis of Text Representation Methods Using Classification
- Julian Szymański
2014 CYBERNETICS AND SYSTEMS
In our work, we review and empirically evaluate five different raw methods of text representation that allow automatic processing of Wikipedia articles. The main contribution of the article—evaluation of approaches to text representation for machine learning tasks—indicates that the text representation is fundamental for achieving good categorization results. The analysis of the representation methods creates a baseline that cannot be compensated for even by sophisticated machine learning algorithms. It confirms the thesis that proper data representation is a prerequisite for achieving high-quality results of data analysis. Evaluation of the text representations was performed within the Wikipedia repository by examination of classification parameters observed during automatic reconstruction of human-made categories. For that purpose, we use a classifier based on a support vector machines method, extended with multilabel and multiclass functionalities. During classifier construction we observed parameters such as learning time, representation size, and classification quality that allow us to draw conclusions about text representations. For the experiments presented in the article, we use data sets created from Wikipedia dumps. We describe our software, called Matrix’u, which allows a user to build computational representations of Wikipedia articles. The software is the second contribution of our research, because it is a universal tool for converting Wikipedia from a human-readable form to a form that can be processed by a machine. Results generated using Matrix’u can be used in a wide range of applications that involve usage of Wikipedia data.
COMPARATIVE ANALYSIS OF THE RESULTS OF GAS FLOW IN A LABYRINTH SEAL FOR A NUMERICAL AND THEORETICAL MODEL
- Paweł Bogumił Kaszowski
- Marek Dzida
2014 Pełny tekst Journal of Polish CIMEEAC
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Comparative assessment of two extraction procedures for determination of bioactive compounds in some berries used for daily food consumption
- Jacek Namieśnik
- Kann Vearasilp
- Hanna Leontowicz
- Maria Leontowicz
- Kyung-Sik Ham
- Seong-Gook Kang
- Yang-Kyun Park
- Patricia Arancibia-Avila
- Fernando Toledo
- Shela Gorinstein
2014 INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
Two extractions with methanol and water were used to determine the antioxidant and binding properties of some berries as a supplement to food. Fluorometry, FTIR spectra and radical scavenging assays were used for characterisation of bioactive compounds (polyphenols, flavonoids, flavanols and tannins) and the levels of their antioxidant activities (AAs). The contents of bioactive compounds and AAs in water and methanol polyphenol extracts in gooseberries, blueberries and cranberries differed, but not always significantly. Water extracts of gooseberries showed the lowest amounts of polyphenols (mg GAE g1), 6.24 0.6, and flavonoids (mg CE g1), 0.29 0.01, and AAs (lMTE g1) determined by DPPH, FRAP, ABTS and CUPRAC assays such as 6.05 0.6, 8.07 0.9, 18.70 1.8 and 13.44 1.2, respectively, in comparison with blueberries and cranberries. Polyphenol content highly correlated with antioxidant activity (R2 from 0.94 to 0.81). The quenching properties of berries were studied by the interaction of water and methanol polyphenol extracts with HSA by 3D fluorescence. In conclusion, the bioactivity of gooseberries was lower than in blueberries and cranberries. Gooseberries can be used as a new source for food consumption and supplementation based on their antioxidant and binding properties. 3D fluorescence spectroscopy and FTIR spectroscopy can be applied as additional analytical tools for rapid estimation of the quality of different food products.
Comparative buckling analysis of cylindrical steel silos with flat or corrugated sheets
- Mateusz Sondej
- Michał Wójcik
- Piotr Iwicki
- Andrzej Tejchman-Konarzewski
2014
W artykule zaprezentowano wyniki analizy wyboczeniowej cylindrycznych silosów wypełnionych materiałem sypkim wykonanych z blachy falistej usztywnionego słupami oraz z blachy płaskiej. Wykonano nieliniową analizę statyczną całego silosu z uwzględnieniem wstępnych imperfekcji geometrycznych przy zastosowaniu różnych przestrzennych modeli numerycznych MES. Wyniki analiza pokazują, że silosy z blachy falistej są bezpieczniejsze i bardziej ekonomiczne.
Comparative in vitro research of the Human Aortic Bioprosthesis
- Kinga Dawidowska
2014 Pełny tekst Advances in Materials Science
E valuate of the usefulness and reliability of structures based on the analysis of recorded parameters determining the flow through the Human Aortic Bioprosthesis (HAB) have been dealt with. By flow parameters changes determining the performance environment of prosthesis analyzed change of the motion dynamics of the valve leaflets as a function of pressure, thereby determining the degree of alignment of the prosthesis to the performance conditions. Based on the gathered measurement data a comparative analysis of flow rate valve prostheses for different frequency values of the piston pump imitating the heart, different ejection capacity and pressure conditioning work environment prosthesis were studied. Interpretation of the recorded image gave the basis for determining the Effective Orifice Area (EOC).