2013 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2013

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Percepcja jakości usług noclegowych w uwarunkowaniach regionalnych Pomorza i Lubelszczyzny
- Grzegorz Zieliński
- Monika Stoma
2013
W niniejszym rozdziale podjęto próbę przedstawienia podstawowych kryteriów postrzegania jakości usług hotelarskich i parahotelarskich, w konsekwencji determinujących decyzję wyboru i zakupu konkretnej usługi z uwzględniniem specyfki regionalnej.
Percepcja jakości usług SPA&Wellness zperspektywy klienta
- Grzegorz Zieliński
- Patrycja Bartsch
2013
W niniejszym rozdziale aurorzy zaprezentowali specyficzny charakter usług typu SPA&Wellness wraz z głównymi formami usług oferowanych w wybranych placówkach. Na podstawie badań zaprezentowano główne determinanty wpływające na percepcję jakości tego typu usług z perspektywy klienta.
Perforating systems in shale gas recovery
- Andrzej Rogala
- Katarzyna Księżniak
- Jan Hupka
2013
Hydraulic fracturing is common method of shale gas recovery. Due to environmental, economical and technological problems many alternative technologies have been developed. One of the most promising group of technologies is based on perforating systems. This paper describes theoretical and practical aspects of best known technologies used to create perforations. New perforating/fracturing technologies which can replace hydraulic fracturing in some water sensitive natural gas reservoirs are also considered.
Performance analysis of an rfid-based 3d indoor positioning system combining scene analysis and neural network methods
- Bartosz Jachimczyk
- Damian Dziak
- Włodzimierz Kulesza
2013 Full text Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
The main purpose of this research is to improve localization accuracy of an active Radio Frequency Identification, RFID tag, in 3D indoor space. The paper presents a new RFID based 3D Indoor Positioning System which shows performance improvement. The proposed positioning system combines two methods: the Scene Analysis technique and Artificial Neural Network. The results of both simulation using Log-Distance Path Loss Model and physical experiments validate that the proposed positioning system improves the localization accuracy of an RFID tag compared with well-known Scene Analysis technique solutions.
Performance of a hybrid microjet – microchannel cooling module
- Rafał Andrzejczyk
- Tomasz Muszyński
2013
The paper presents the experimental investigation of a microjet- microchannel cooling module. In which microjets of water are impinging into the microchannels and forming a liquid film on the impingement surface. Applied technology takes benefits from two very attractive heat removal techniques. When lminar jets are impinging on the surface have a very high kinetic energy at the stagnation point, also in microchannels boundary layer is very thin allowing to obtain very high heat fluxes. Applied technology of jet production can result with the jet hydraulic diameter from 200 to 500 μm, combined with microchannels 2mm wide and 2 mm high. Tests were conducted under steady state conditions, for water as test fluid. Results of experiments are compared to standard cooling techniques.
PERFORMANCE OF ENDOSCOPIC IMAGE ANALYSIS ALGORITHMS IN LARGE BOWEL VIDEOS PROCESSING
- Jan Cychnerski
- Adam Brzeski
- Adam Blokus
2013
Computer-assisted endoscopy is a rapidly developing eld of study. Many image anal- ysis algorithms exist, achieving very high rates of eciency at processing single endoscopic images. However, most of them were never tested in processing real-life endoscopic videos. In the article such tests of 16 endoscopy image analysis algorithms are presented and dis- cussed. Tests were performed on two real-life endoscopic videos of a human large bowel. Each algorithm was trained and tested twice: for recognizing cancer/normal tissue and for blurry/sharp frames. Results of those tests showed that there exists only a small correlation between algorithms' eciency scores (from single images tests) and their performance at pro- cessing real-life endoscopic videos. This brought to conclusion that eciency tests on single images are not sucient for estimating algorithms' quality in real-life videos processing.
PERS - QUIET ROAD SURFACE FOR URBAN AREAS
- Jerzy Ejsmont
- Beata Świeczko-Żurek
- Stanisław Taryma
2013
Traffic noise is one of the most important environmental problems in densely populated urban areas. At low speeds the tyre/road interaction dominates all other sources. It is anticipated that when electric and hybrid vehicles gain dominance in city traffic, the importance of tyre/road noise will still increase as electric engines are much less noisy than combustion engines. On the other hand, electric and hybrid urban vehicles are less powerful than conventional cars, thus they may allow for different road surface solutions and tyres of unconventional construction. One of the candidate road surfaces for urban applications is the so called poroelastic road surface "PERS" composed from rubber aggregate, mineral chippings and polyurethane resin. Road surfaces of this type are being developed in Japan and Europe. The paper discusses acoustical properties of such surfaces as well as some practical and environmental aspects of their production and usage. The results are based on research project PERSUADE that is funded by the European Commission. The aim of the project is to develop a road surface that will reduce tyre/road noise to a great extent but will not have adverse effects on fuel consumption and broadly defined safety (skid resistance, fire risk, biological dangers).
Perspektywa wykorzystania napędu alternatywnego w lubelskiej komunikacji trolejbusowej (1)
- Mikołaj Bartłomiejczyk
- Marcin Połom
2013 Technika Transportu Szynowego
Trolejbus stanowi pośrednie rozwiązanie między autobusem a tramwajem. System klasycznej komunikacji trolejbusowej nie wymaga tak znaczących nakładów inwestycyjnych jak w przypadku tramwaju, lecz nie jest porównywalnie elastyczny ruchowo. Komunikacja trolejbusowa uzależniona od zasilania trakcyjnego stała się uciążliwa w eksploatacji. Poszukiwano więc rozwiązań umożliwiających „uelastycznienie” trolejbusów. W wyniku rozwoju technologii pojawiły się alternatywne sposoby zasilania układu napędowego trolejbusów przez zabudowanie agregatów spalinowych spełniających rolę prądnicy, akumulatorów o dużej pojemności energetycznej lub zasobników superkondensatorowych.
Perspektywa wykorzystania napędu alternatywnego w lubelskiej komunikacji trolejbusowej (2)
- Mikołaj Bartłomiejczyk
- Marcin Połom
2013 Technika Transportu Szynowego
Trolejbus stanowi pośrednie rozwiązanie między autobusem a tramwajem. System klasycznej komunikacji trolejbusowej nie wymaga tak znaczących nakładów inwestycyjnych jak w przypadku tramwaju, lecz nie jest porównywalnie elastyczny ruchowo. Komunikacja trolejbusowa uzależniona od zasilania trakcyjnego stała się uciążliwa w eksploatacji. Poszukiwano więc rozwiązań umożliwiających „uelastycznienie” trolejbusów. W wyniku rozwoju technologii pojawiły się alternatywne sposoby zasilania układu napędowego trolejbusów przez zabudowanie agregatów spalinowych spełniających rolę prądnicy, akumulatorów o dużej pojemności energetycznej lub zasobników superkondensatorowych.
Perspektywy i kierunki rozwoju energetyki w Polsce
- Waldemar Kamrat
2013
Przedstawiono perspektywy i kierunki rozwoju energetyki w Polsce. Sformułowano wnioski dotyczące perspektyw rozwoju energetyki.
Pesticide residues levels in honey from apiaries located of Northern Poland
- Żaneta Bargańska
- Marek Ślebioda
- Jacek Namieśnik
2013 FOOD CONTROL
Concentration levels of 30 pesticide residues were measured in honey samples collected from apiaries in northern part of Poland (Pomerania) using method based on the QuEChERS extraction followed by liquid chromatography-tandem mass spectrometry with electron spray ionization (LC-ESI-MS/MS). In 29% of the samples were found positive for at least some of the target compounds. Concentration of bifenthrin, fenpyroximate, methidathion, spinosad, thiamethoxam, and triazophos exceeded maximum residue levels (MRL) in five samples (11%), the kind of the residues being correlated to agriculture practices in the region. The maximum values of these pesticides were 14.5, 16.3, 25.7, 20.6, 20.2 and 20.3 ng/g respectively. Profenofos was the most abundant at concentration ranged from <LOQ to 17.2 ng/g.
Pesticides in the Environment
- Marek Biziuk
- Jolanta Fenik
- Monika Kosikowska
- Maciej Tankiewicz
2013
Applied all over the world, pesticides are some of the most dangerous pollutants of the environment becauseof their mobility and ability to accumulate in the environment and their consequent long-term adverseeffects on living organisms in general and human health in particular. For these reasons, it is essential tomonitor and analyze pesticide residues in the environment. This entry discusses the classification of pesticidesas well as their effects on and their fate in the environment. Since legal regulations have come intoforce stipulating highest permissible levels of pesticides and their residues in the environment, the analyticaltechniques applied are sensitive, selective, and appropriate to the low concentrations of the target analytes.The analysis of environmental samples for the presence of pesticides is very difficult: the processesinvolved in sample preparation are labor-intensive and time-consuming and may be a source of additionalcontamination and error; the low concentration levels of analytes and matrix complexity cause yet moreproblems. The extraction and determination of pesticide residues in environmental samples are discussed,as are the techniques most commonly used in these processes. The difficulties occurring at each stage in theanalytical procedure are outlined.
Phase transition of a dimorphic fungus Penicillium marneffei
- Milena Kordalewska
- Dorota Drapała
2013
Penicillium marneffei is a pathogenic fungus that afflicts immunocompromised individuals who live or travel in Southeast Asia. This species is unique, because it is the only dimorphic member of the genus Penicillium. Dimorphism results from a process, termed phase transition, which is regulated by temperature of incubation. At room temperature, the fungus grows filamentously (mould phase), but at body temperature (37°C), a uninucleate yeast form develops that reproduces by fission. Formation of the yeast phase appears to be a requisite for pathogenicity. The dimorphic nature of P. marneffei has attracted investigators interested in not only understanding the underlying molecular mechanisms of its unique mode of cellular development, but also for the identification of novel targets that might be exploited in the development of new chemotherapeutic modalities.
Photoacoustic response of a common starfish tissue
- Jarosław Rybicki
- Nikolas Guskos
- Jerzy Majszczyk
- Janusz Typek
- Bohdan Padlyak
2013 Ukrainian Journal of Physical Optics
W pracy przedstawiono wyniki badań widma fotoakustycznego tkanki rozgwiazdy czerwonej (Asterias Rubens). Otrzymane wyniki się zbliżone do uzyskanych wcześniej dla innych organizmów żywych Trunculariopis Trunculus i Sea Urchin. Rezultaty badań potwierdziły eksperymentalnie, że organizmy stare geologicznie absorbują promieniowanie szczególnie intensywnie w zakresie długości fal, które nie są pochłaniane przez wodę.
Photocatalysts for Solar Energy Conversion
- Adriana Zaleska-Medynska
- Michał Nischk
- Anna Malankowska
2013
Photocatalytic oxidation over suspended solid photocatalysts (e.g., titanium dioxide) has been proposed as a sustainable process for treatment and purification of water and wastewater as well as the process for photoconversion of solar energy to hydrogen, methane, and other low hydrocarbons. Solar radiation could be used to drive heterogeneous electrochemical reactions at the surface of an optically active photocatalyst (e.g., TiO2-based or non-TiO2-based), resulting in the production of solar fuels, including hydrogen via photolytic water splitting, glycerol, or biomass conversion and hydrocarbons (methane, methanol, etc.) via CO2 photoreduction. This chapter focuses on preparation and characterization of photocatalysts for solar energy conversion. Non-TiO2 and TiO2-based photocatalysts used for CO2 photoconversion, water photosplitting, as well as hydrogen production, via glycerol and biomass photoconversion, are discussed.
Photoelectric properties of a novel MEH-PPV/F16ZnPc heterojunction
- Justyna Szostak
- Ryszard Signerski
- Jan Godlewski
2013 PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Photoelectric properties of a novel poly[2-methoxy-5-(2-ethylhexyloxy-p-phenylenevinylen)] (MEH-PPV)/perfluorozincphthalocyanine (F16ZnPc) planar heterojunction provided with BCP and MoO3 buffer layers sandwiched between indium tin oxide (ITO) and Ag are shown. Efficient photogeneration of charge carriers at this junction is observed. Effect of bathocuproine (BCP) and MoO3 buffer layers on the performance of cells is analysed. Mechanisms of injection, generation, trapping and recombination of charge carriers in the dark as well as under illumination are discussed. Reliable exciton diffusion length in the F16ZnPc of (187) nm is evaluated.
Photoelectron spectroscopy of brominated derivative of pyrimidine: 2-bromopyrimidine
- Małgorzata Śmiałek-Telega
- E. Szymańska
- M. MacDonald
- L. Zuin
- N.j. Mason
2013 The European Physical Journal-Special Topics
In this study the brominated derivative of pyrimidine, 2-bromopyrimidine, was investigated by photoelectron spectroscopy. Outer valence photoelectron spectra recorded at 21.22, 45 and 100 eV photon energy for this compound are presented. The recorded spectra have a higher resolution than that previously reported in the literature. The bromine 3d and 3p edge photoelectron spectra have also been recorded in a photon impact experiment at 100 and 225 eV. All measurements were performed using Double Toroidal Coincidence Spectrometer showing its potential as a versatile apparatus for spectroscopic studies.
Photophysics of Soret-Excited Tin(IV) Porphyrins in Solution
- Kenneth P. Ghiggino
- Neeraj Kumar Giri
- Jordan Hanrieder
- Jonathon D. Martell
- Jens Muller
- Matthew F. Paige
- Benjamin Robotham
- Jędrzej Szmytkowski
- Ronald P. Steer
2013 JOURNAL OF PHYSICAL CHEMISTRY A
The photophysics of low-chlorin tin(IV) tetraphenylporphyrin dihydroxide, a core building block for axially substituted supramolecular tin porphyrin constructs, has been studied in a variety of hydrogen-bonding, nonpolar, and aprotic polar solvents using steady-state, nanosecond, and femtosecond time-resolved emission, and femtosecond time-resolved absorption methods. In hydrogen-bonding solvents the metalloporphyrin exists as solvated monomers, and its Soret-excited S2 state in these solvents exhibits the expected linear energy gap law relationship with first-order population decay times in the 0.8 to 1.7 ps range. Evidence is presented that this metalloporphyrin aggregates in other solvents at the concentrations typically used for these ultrafast measurements and yields species-averaged time-resolved data. Cw laser excitation in the Q-band under deaerated conditions produces weak S2–S0 fluorescence (photon upconversion) as a result of triplet–triplet annihilation.
Photovoltaic demonstration set up
- Katarzyna Karpienko
- Maciej Wróbel
- Łukasz Surażyński
2013
The use of photovoltaics is growing rapidly in the industry as well as households. Therefore, educating the public will help them understand solar cell technology, which is becoming more common in everyday life. This paper proposes a demonstrational set-up of photovoltaic panel for the purpose of science education. It was used in numerous outreach activities such as science fairs. Moreover, it proved to be a great tool for education of photovoltaics among technical students, which helps them understand the principle of operation of solar cells and its practical application.
Physical and mathematical modelling of implant-fascia system in order to improve laparoscopic repair of ventral hernia
- Agnieszka Tomaszewska
- Izabela Lubowiecka
- Czesław Szymczak
- Maciej Śmietański
- Błażej Meronk
- Paweł Kłosowski
- Kamil Bury
2013 CLINICAL BIOMECHANICS
This paper describes an investigation of biomechanical behaviour of hernia repair, which is focused on the selection of safe linking of certain type of implant with fascia in laparoscopic operation. The strength of various fixations of the implant to the fascia is analysed. Methods: The research is based on experimental observations of operated hernia model behaviour during a dynamic impulse load corresponding to post-operative cough. Fifty seven different types of models of implanted mesh are considered. Five types of implants and five types of connectors are used. Mechanical properties of the implants as well as limit tearing forces of joints are identified in uni-axial tensile tests. Mathematical model of implanted mesh based on finite element method is proposed. The identified mechanical properties of the materials are applied and the model is calibrated using quantities measured during experiments. Findings: The presented results point at trans-abdominal sutures and ProTacks (connectors) and at DynaMesh (implant) as the most reliable materials used in ventral hernia operation, in the tested materials group. Desired properties of implants seemto be: elastic properties similar to the properties of tissues and high local strength, as fixation have a local character. The proposedmathematicalmodel can be applied to simulate real behaviour of an implant with appropriate accuracy and to estimate the number of tacks for the implantation of hernia meshes. Interpretation: The presented resultsmay help in the deeper understanding of the fascia–mesh systembehaviour, and thus may lead to improve the fixation methods.