2015 - Repozytorium publikacji - Politechnika Gdańska

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SMART GRID TECHNOLOGIES IN ELECTRIC POWER SUPPLY SYSTEMS OF PUBLIC TRANSPORT
- Mikołaj Bartłomiejczyk
2015
Nowadays the issue of electric energy saving in public transport is becoming a key area of interest which is connected both with a growth in environmental awareness of the society and an increase in the prices of fuel and electricity. It can be achieved by reducing of the transmission losses in supply system or by the improving of the usage of the regenerative breaking. The article presents an analysis of applying these two options for increasing recovery energy by application of Smart Grid solutions in public transport systems. Analysis will be based on the example of trolleybus transport system in Gdynia.
SMART GRID TECHNOLOGIES IN ELECTRIC POWER SUPPLY SYSTEMS OF PUBLIC TRANSPORT
- Mikołaj Bartłomiejczyk
2015 Technika Transportu Szynowego
Nowadays the issue of electric energy saving in public transport is becoming a key area of interest, which is connected both with a growth in environmental awareness of the society and an increase in the prices of fuel and electricity. It can be achieved by reducing the transmission losses in a supply system or by the improving the usage of the regenerative breaking. The article presents an analysis of applying these two options for increasing recovery energy by application of Smart Grid solutions in public transport systems. Analysis will be based on the example of trolleybus transport system in Gdynia.
Smart Modeling of Maritime Vessels
- Przemysław Falkowski-Gilski
- Jacek Stefański
2015 Pełny tekst Journal of Shipping and Ocean Engineering
Currently, the market offers many visualization tools available to graphic designers, engineers, managers and academics working on maritime environments. The practice of visualization involves making and manipulating images that convey novel phenomena and ideas. Visual communication, together with virtual reality environments, is an emerging and rapidly evolving discipline. It brings great advantage over written word or voice alone, as visual sense is by far the most dominant component of human sensory perception. A new smart approach for modeling maritime vessels is described in this paper. Various ways of making modeling relevant for work within the field of maritime management, training and education are discussed.
Smooth orthogonal projections on sphere.
- Marcin Bownik
- Karol Dziedziul
2015 CONSTRUCTIVE APPROXIMATION
We construct a decomposition of the identity operator on the sphere S^d as a sum of smooth orthogonal projections subordinate to an open cover of S^d. We give applications of our main result in the study of function spaces and Parseval frames on the sphere.
Social change: from the Solidarity y tmovement too urban movements -– a Design Thinking approach in co-producing city of Gdansk
- Dorota Dominika Kamrowska-Załuska
- Joanna Szechlicka
- Paweł Mrozek
2015
This paper presents a model of bottom-up revitalization of Gdansk's urban quarter using Design Thinking approach as users needs oriented method co-producing of space. This project is introduced as a possible canva to elaborate the model of intervention for other spaces in need of similar intervention.
Solid-contact lead(II) ion-selective electrodes for potentiometric determination of lead(II) in presence of high concentrations of Na(I), Cu(II), Cd(II), Zn(II), Ca(II) and Mg(II)
- Artur Jasiński
- Marcin Guziński
- Grzegorz Lisak
- Johan Bobacka
- Maria Bocheńska
- Marcin Guzinski
2015 SENSORS AND ACTUATORS B-CHEMICAL
Lead and its compounds are a serious threat to the environment. Monitoring of this toxic heavy metal is a driving force for the continuous development of novel lead(II) ionophores to be applied in ion-selective electrodes. In this work a highly selective lead(II) ionophore, namely 25,26,27,28-tetrakis(piperidinylthiocarbonylmethylene)-p-tert-butylcalix[4]arene, was used in solid-contact ion-selective electrodes for determination of Pb(II) at high concentrations of interfering ions, such as Na(I), Cu(II), Cd(II), Zn(II), Mg(II) and Ca(II). The potentiometric response of ionophore-based Pb(II)-ISEs was compared to that of a solid-state crystalline Pb(II)-ISE for Na+, Cu2+, Cd2+ and Zn2+. Determination of lead(II) by ion-selective electrodes was compared to measurements done by atomic absorption spectroscopy. Comparable concentrations of lead were obtained by both techniques, which indicate the possibility to apply such ion-selective electrodes for monitoring of lead in e.g. Zn–Pb mines where the concentration of zinc may be high compared to lead.
Solution of coupled integral equations for quantum scattering in the presence of complex potentials
- Jan Franz
2015 Pełny tekst JOURNAL OF MATHEMATICAL PHYSICS
In this paper, we present a method to compute solutions of coupled integral equations for quantum scattering problems in the presence of a complex potential. We show how the elastic and absorption cross sections can be obtained from the numerical solution of these equations in the asymptotic region at large radial distances.
Solutions of inverter systems in Shore-to-Ship Power supply systems
- Ryszard Strzelecki
- Piotr Mysiak
- Tomasz Sak
2015
The article presents a clearly formulated need for installing S2SP (Shore to Ship Power) systems, in particular Medium Voltage (MV) systems, along with certain solutions of modern inverter systems used in those systems. Requirements and basic configurations of S2SP systems are discussed, focusing in particular on capabilities of the S2SP system with DC distribution busbar. Moreover, on the background of the executing assumptions for such a system, selected results of simulation tests are presented for the case of power supply from the 6,6/11 kV network.
Solvation of ionic liquids based on N-methyl-N-alkyl morpholinium cations in dimethylsulfoxide – volumetric and compressibility studies
- Łukasz Marcinkowski
- Adam Kloskowski
- Jacek Czub
- Jacek Namieśnik
- Dorota Warmińska
2015 JOURNAL OF CHEMICAL THERMODYNAMICS
The density and sound velocity of the solutions of ionic liquids based on N-alkyl-N-methyl-morpholinium cations, N-ethyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide, N-butyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide, N-methyl-N-octyl-morpholinium bis(trifluoromethanesulfonyl)imide and N-decyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide in dimethylsulfoxide were measured at T = (298.15 to 318.15) K and at atmospheric pressure. The apparent molar volume and apparent molar compressibility values were evaluated from density and sound velocity values and fitted to the Masson equation from which the partial molar volume and partial molar isentropic compressibility of the ILs at infinite dilution were also calculated at working temperatures. By using the density values, the limiting apparent molar expansibilities were estimated. The effect of the alkyl chain length of the ILs and experimental temperature on these thermodynamic properties is discussed. In addition, molecular dynamics simulations were used to interpret the measured properties in terms of interactions of ILs with solvent molecules. Both, volumetric measurements results and molecular dynamics simulations for ionic liquids in dimethylsulfoxide were compared and discussed with results obtained for the same IL in acetonitrile.
Solving Boundary Value Problems for Second Order Singularly Perturbed Delay Differential Equations by ε-Approximate Fixed-Point Method
- Zbigniew Bartoszewski
- Anna Baranowska
2015 Pełny tekst Mathematical Modelling and Analysis
In this paper, the boundary value problem for second order singularly perturbed delay differential equation is reduced to a fixed-point problem v = Av with a properly chosen (generally nonlinear) operator A. The unknown fixed-point v is approximated by cubic spline vh defined by its values vi = vh(ti) at grid points ti, i = 0, 1, ... ,N. The necessary for construction the cubic spline and missing the first derivatives at the boundary are replaced by the derivatives of the corresponding interpolating polynomials matching the grid points values nearest to the boundary points. An approximation of the solution is obtained by minimization techniques applied to a function whose arguments are the grid point values of the sought spline. The results of numerical experiments with two boundary value problems for the second order singularly perturbed delay differential equations as well as their comparison with the results of other methods employed by other authors are also provided.
Solving highly-dimensional multi-objective optimization problems by means of genetic gender
- Tomasz Białaszewski
- Zdzisław Kowalczuk
2015
Paper presents a computational optimization study using a genetic gender approach for solving multi-objective optimization problems of detection observers. In this methodology the information about an individual gender of all the considered solutions is applied for the purpose of making distinction between different groups of objectives. This information is drawn out of the fitness of individuals and applied during a current parental crossover in the performed evolutionary multi-objective optimization (EMO) processes.
Sound Art and Architecture: New Horizons for Architecture and Urbanism
- Justyna Borucka
2015 Procedia - Social and Behavioral Sciences
The article discusses the crossroad between art and architecture. It sketches out the theoretical and practical aspects of involving art into architecture and multisensory dimensions of space. The analysis is based on examples of innovative experimental activities for architecture: educational projects such as workshops, seminars and courses, combining art and architecture, with special emphasis on sound art, and the consequences of such synergy for the perception of the space. Specifically, it aims to understand how this interdisciplinary approach in architecture can emphasize our understanding of the potential of non-visual aspects of space and stimulate architectural creativity.
Sparse vector autoregressive modeling of audio signals and its application to the elimination of impulsive disturbances
- Maciej Niedźwiecki
- Marcin Ciołek
2015
Archive audio files are often corrupted by impulsive disturbances, such as clicks, pops and record scratches. This paper presents a new method for elimination of impulsive disturbances from stereo audio signals. The proposed approach is based on a sparse vector autoregressive signal model, made up of two components: one taking care of short-term signal correlations, and the other one taking care of long-term correlations. The method is evaluated on a set of clean audio signals contaminated with real click waveforms extracted from silent parts of old gramophone recordings.
Spatial Aspects of Tram and Trolleybus Supply System
- Mikołaj Bartłomiejczyk
- Marcin Połom
2015
Nowadays the issue of electric energy saving in public transport is becoming a key area of interest which is connected both with a growth in environmental awareness of the society and an increase in the prices of fuel and electricity. It can be achieved by reducing of the transmission losses in supply system or by the improving of the usage of the regenerative breaking. The spatial differentiation of the energy supply system of public transport is one of the elements which has significant impact on the energy consumption.
Spatio-temporal filtering for determination of common mode error in regional GNSS networks
- Janusz Bogusz
- Maciej Gruszczynski
- Mariusz Figurski
- Anna Klos
2015 Pełny tekst Central European Journal of Geosciences
The spatial correlation between different stations for individual components in the regional GNSS networks seems to be significant. The mismodelling in satellite orbits, the Earth orientation parameters (EOP), largescale atmospheric effects or satellite antenna phase centre corrections can all cause the regionally correlated errors. This kind of GPS time series errors are referred to as common mode errors (CMEs). They are usually estimated with the regional spatial filtering, such as the "stacking". In this paper, we show the stacking approach for the set of ASG-EUPOS permanent stations, assuming that spatial distribution of the CME is uniform over the whole region of Poland (more than 600 km extent). The ASG-EUPOS is a multifunctional precise positioning system based on the reference network designed for Poland. We used a 5- year span time series (2008-2012) of daily solutions in the ITRF2008 from Bernese 5.0 processed by the Military University of Technology EPN Local Analysis Centre (MUT LAC). At the beginning of our analyses concerning spatial dependencies, the correlation coefficients between each pair of the stations in the GNSS network were calculated. This analysis shows that spatio-temporal behaviour of the GPS-derived time series is not purely random, but there is the evident uniform spatial response. In order to quantify the influence of filtering using CME, the norms L1 and L2 were determined. The values of these norms were calculated for the North, East and Up components twice: before performing the filtration and after stacking. The observed reduction of the L1 and L2 norms was up to 30% depending on the dimension of the network. However, the question how to define an optimal size of CME-analysed subnetwork remains unanswered in this research, due to the fact that our network is not extended enough.
Spawalność tytanu Grade 2 na przykładzie płaszczowo-rurowego wymiennika ciepła
- Grzegorz Rogalski
- Dariusz Fydrych
- Michał Landowski
- Jerzy Łabanowski
2015 Pełny tekst Przegląd Spawalnictwa
W artykule scharakteryzowano właściwości, obszary zastosowania i problemy związane ze spawalnością tytanu i jego stopów. Opracowano technologię spawania metodą TIG płaszczowo-rurowego wymiennika ciepła typu JAD B z tytanu Grade 2, zaprezentowano wyniki badań nieniszczących i niszczących złączy spawanych. Szczególną uwagę zwrócono na trudności związane z przygotowaniem krawędzi elementów do spawania i wynikające z nich niezgodności spawalnicze.
Specific Binding of Cholesterol to the Amyloid Precursor Protein: Structure of the Complex and Driving Forces Characterized in Molecular Detail
- Łukasz Nierzwicki
- Jacek Czub
2015 Journal of Physical Chemistry Letters
C99 is the C-terminal membrane-bound fragment of the amyloid precursor protein that is cleaved by γ-secretase to release Aβ peptides, the hallmark of Alzheimer’s disease (AD). Specific interactions of C99 with cholesterol have been proposed to underlie the recognized role of cholesterol in promoting amyloidogenesis. By using molecular dynamics simulations, we studied cholesterol binding to C99 in a lipid bilayer. We determined the free-energy profile of binding and analyzed the structure of C99/cholesterol complexes in two low-energy binding modes. We also examined the complexation driving forces and found, unexpectedly, that the interactions between the GxxxG dimerization motif and the cholesterol ring system are not sufficient for binding and that further stabilization mediated by the C99 N-terminal domain is essential. Taken together, our results strongly support the view that C99 specifically binds cholesterol in the cell membrane; the detailed information on the structure and energetics of the complex may assist in the design of new anti-AD drugs.
Specific detection of Alternaria alternata by PCR and real-time PCR
- Milena Kordalewska
- Anna Brillowska-Dąbrowska
2015 Acta Biochimica Polonica
Fungi of Alternaria genus are cosmopolitan organisms, which spores can be found in the air, soil, water, clothing and food. They commonly occur as saprotrophs on the plant remains, contributing to the decomposition of organic matter. Additionally, they are components of the normal human and animal skin flora. Alternaria spp. are also known human allergens, causing hay fever and allergic reactions that can lead to the development of asthma. They are more and more frequently found as etiological factors of superficial, organ and disseminated infections in humans and animals. The most prevalent species of Alternaria genus isolated from infection sites is A. alternata. The aim of this work was to develop PCR and real-time PCR assays that enable specific detection of A. alternata DNA. Research methods included fungal DNA isolation, design of A. alternata - specific primers based on the alignment of β-tubulin gene sequences from different fungi, PCR followed by amplicons electrophoretic analysis and real-time PCR followed by amplicons melting curve analysis. Both PCR and real-time PCR assays accurately identified all tested A. alternata strains. Developed assays are rapid, easy to interpret, and can be useful tools for detection of A. alternata.
Spectral measurement of birefringence using particle swarm optimization analysis
- Maciej Kraszewski
- Marcin Strąkowski
- Jerzy Pluciński
- Bogdan Kosmowski
2015 APPLIED OPTICS
The measurement of birefringence is useful for the examination of both technical and biological objects. One of the main problems is that the polarization state of light in birefringent media changes periodically. Without the knowledge of the period number, the birefringence of a given medium cannot be determined reliably. We propose to analyse the spectrum of light in order to determine the birefringence. We use a Particle Swarm Optimization algorithm for an automatic processing spectra of the light transmitted through a birefringent material for two orthogonal states of polarization. We have tested described algorithm on a liquid crystal cell with varying effective birefringence. The proposed method can be used for the measurement of uniaxial positive birefringence without knowing the number of retardation period or an approximate value of the measurement result. It makes it useful for automatic measurements, when hundreds or thousands of spectra need to be analysed.
Spectral reflectance modeling of ZnO layers made with Atomic Layer Deposition for application in optical fiber Fabry-Perot interferometric sensors
- Paweł Wierzba
- Małgorzata Szczerska
2015
Suitability of zinc oxide (ZnO) layers grown using Atomic Layer Deposition for operation in optical-fiber extrinsic Fabry-Perot sensors is investigated using a numerical model. Reflectance spectra obtained using the developed model indicate that the application of these layers in optical-fiber extrinsic Fabry-Perot sensors is difficult as it may require a source whose spectrum width is about 300 nm. A series of ZnO layers grown on end faces of SMF-28 fiber were prepared and their reflectance spectra were recorded by an optical spectrum analyser in order to verify the modelling results. The spectra contain a series of peaks not predicted by the model, which is attributed to two-mode propagation in the SMF-28 fiber connecting the ZnO layer with the rest of the measurement system.