2015 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2015

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Determination of benzo(a)pyrene content in PM10 using regression methods
- Jacek Gębicki
- Tomasz Ludkiewicz
- Jacek Namieśnik
2015 Pełny tekst Medycyna Środowiskowa - Environmental Medicine
The paper presents an attempt of application of multidimensional linear regression to estimation of an empirical model describing the factors influencing on B(a)P content in suspended dust PM10 in Olsztyn and Elbląg city regions between 2010 and 2013. During this period annual average concentration of B(a)P in PM10 exceeded the admissible level 1.5-3 times. Conducted investigations confirm that the reasons of B(a)P concentration increase are low-efficiency individual home heat stations or low-temperature heat sources, which are responsible for so-called low emission during heating period. Dependences between the following quantities were analysed: concentration of PM10 dust in air, air temperature, wind velocity, air humidity. A measure of model fitting to actual B(a)P concentration in PM10 was the coefficient of determination of the model. Application of multidimensional linear regression yielded the equations characterized by high values of the coefficient of determination of the model, especially during heating season. This parameter ranged from 0.54 to 0.80 during the analyzed period.
Determination of eight artificial sweeteners and common Stevia rebaudiana glycosides in non-alcoholic and alcoholic beverages by reversed-phase liquid chromatography coupled with tandem mass spectrometry.
- Paweł Kubica
- Jacek Namieśnik
- Andrzej Wasik
2015 Pełny tekst ANALYTICAL AND BIOANALYTICAL CHEMISTRY
The method for the determination of acesulfame-K, saccharine, cyclamate, aspartame, sucralose, alitame, neohesperidin dihydrochalcone, neotame and five common steviol glycosides (rebaudioside A, rebaudioside C, steviol, steviolbioside and stevioside) in soft and alcoholic beverages was developed using high-performance liquid chromatography and tandem mass spectrometry with electrospray ionisation (HPLC-ESI-MS/MS). To the best of our knowledge, this is the first work that presents an HPLC-ESI-MS/MS method which allows for the simultaneous determination of all EU-authorised high-potency sweeteners (thaumatin being the only exception) in one analytical run. The minimalistic sample preparation procedure consisted of only two operations; dilution and centrifugation. Linearity, limits of detection and quantitation, repeatability, and trueness of the method were evaluated. The obtained recoveries at three tested concentration levels varied from 97.0 to 105.7 %, with relative standard deviations lower than 4.1 %. The proposed method was successfully applied for the determination of sweeteners in 24 samples of different soft and alcoholic drinks.
Determination Of Gas Mixture Components Using Fluctuation Enhanced Sensing And The LS-SVM Regression Algorithm
- Łukasz Lentka
- Janusz Smulko
- Radu Ionescu
- Claes Goran Granqvist
- Laszlo B. Kish
2015 Pełny tekst Metrology and Measurement Systems
This paper analyses the effectiveness of determining gas concentrations by using a prototype WO3 resistive gas sensor together with fluctuation enhanced sensing. We have earlier demonstrated that this method can determine the composition of a gas mixture by using only a single sensor. In the present study, we apply Least-Squares Support-Vector-Machine-based (LS-SVM-based) nonlinear regression to determine the gas concentration of each constituent in a mixture. We confirmed that the accuracy of the estimated gas concentration could be significantly improved by applying temperature change and ultraviolet irradiation of the WO3 layer. Fluctuation-enhanced sensing allowed us to predict the concentration of both component gases.
Determination of Hydroxy Groups in the Modified Epoxy Oligomers Using IR-Spectroscopy
- Ostap Ivashkiv
- Piotr Bruździak
- Olena Shyshchak
- Jacek Namieśnik
- Michael Bratychak
2015 Pełny tekst Chemistry & Chemical Technology
The use of IR-spectroscopy has been proposed to determine the content of hydroxy groups in the modified functional oligomers based on bisphenol A diglycidyl ether. Apart from hydroxy groups the investigated oligomers contain epoxy or peroxy, carboxy or acrylic groups.
Determination of magnetisation conditions in a Double-Core Barkhausen Noise measurement set-up
- Marek Augustyniak
- Bolesław Augustyniak
- Leszek Piotrowski
- Marek Chmielewski
2015 Pełny tekst JOURNAL OF NONDESTRUCTIVE EVALUATION
The magnetic Barkhausen effect is useful forassessing 1D and 2D stress states of ferromagnetic steelobjects. However, its extension to technically importantmaterials, such as duplex anisotropic steels, remains challenging. The determination of magnetisation inside the studied object and the electromagnet for various geometries, materials and magnetisation angles is a key issue.Three-dimensional, dynamic finite element analysis has beenapplied to reproduce time-varying fields inside and outsidethe prototype of a double-core magnetising setup. Useful relationships between characteristics (peak height and localtion) andmagnetic induction vector have been proposed. Thequalitative plausibility of simulation has been validated withan experiment and an analytic formula of skin depth. Theangular anisotropy of magnetic Barkhausen effect (MBN) inan isotropic sample has been shown in simulation and confirmed experimentally. The numerical model, despite somelimitations, seems to be an efficient tool for calibratingstress/MBN relationships at least in isotropic structural steelcomponents.
Deterministic Rendezvous in Restricted Graphs
- Ashley Farrugia
- Leszek Gąsieniec
- Łukasz Kuszner
- Eduardo Pacheco
2015
In this paper we consider the problem of synchronous rendezvous in which two anonymous mobile entities (robots) A and B are expected to meet at the same time and point in a graph G = (V;E). Most of the work devoted to rendezvous in graphs assumes that robots have access to the same sets of nodes and edges, where the topology of connections may be initially known or unknown. In our work we assume the movement of robots is restricted by the topological properties of the graph space coupled with the intrinsic characteristics of robots preventing them from visiting certain edges in E:
Developing Game-Structure Sensitive Matchmaking System for Massive-Multiplayer Online Games
- Mateusz Myślak
- Dominik Deja
2015
Providing a fair matchmaking system is an essential issue, while developing every online video game. In the article, we show that the currently existing matchmaking system in League of Legends, one of the most popular online video games currently existing, is built on a base of conditions which do not hold true in the presence of empirical data. This, in short, decreases the effectiveness of the ranking system, and negatively affects users experience. Therefore, we propose a new ranking system, which genuinely answers the needs, which arise from League of Legends gameplay. As League of Legends gameplay model is nowadays highly popular amid online video games, the proposed system can be easily generalized and adopted by other online video games that are currently popular among gamers.
Development of different methods for drugs and psychoactive substances extraction from hair samples and their identification based on HPLC-ESI-QTOF analysis
- Justyna Aszyk
- Agata Kot-Wasik
2015
Over the past decade, the use of non-controlled designer drugs and drug of abuse has rapidly increased. Hair, as a human matrix, enables detection of drugs incorporated into its structure. Studies of presence and identification of drug metabolites in human hair samples has been performed using liquid chromatography electrospray ionization quadrupole time of flight mass spectrometry (HPLC-ESI-QTOF-MS) with steady alternation of MS and MS/MS. The comparison of three analytical procedures (including decontamination and extraction steps) allowing qualitative screening of drugs present in hair samples were performed based on hair samples collected from 13 volunteers declaring exposition to several drugs. It was concluded, that all methods are suitable to extract the majority of the relevant substances from hair. In spite of this, ambiguity correlation between data known from volunteers questionnaires and data obtained from HPLC-ESI-QTOF-MS analyses has been observed and discussed - - .
Development of Education Tomorrow’s Engineers at the Faculty of Mechanical Engineering in GUT
- Jacek Kropiwnicki
- Wojciech Kiełczyński
2015
Paper presents educational activity of Faculty of Mechanical Engineering of the Gdańsk University of Technology. Faculty of Mechanical Engineering is one of the largest departments of the Gdańsk University of Technology (GUT), currently educating about 3 000 student. The Faculty of Mechanical Engineering offers studies in different areas: Mechanical Engineering, Medical and Mechanical Engineering, Materials Engineering, Mechatronic, Management and Production Engineering, Power Engineering. The studies are performed in conformity to Bologna system. Lectures are conducted in five Chairs, which include 18 Divisions. In 2000 GUT introduced the European Credit Transfer and Accumulation System (ECTS). Each student should get during one academic year 60 ECTS points. Obtaining a diploma of BEng requires the acquisition of no less than 210 ECTS credits in 7 semesters, and a MEng degree requires the acquisition of 90 ECTS credits in 3 semesters. Each curriculum of study-courses are approved by the Dean, the Faculty Council and the Vice-Rector for Education.
Development of gas chromatography - tandem mass spectrometry procedure for development of pesticide residues in honey and honeybee samples
- Żaneta Bargańska
- Marek Ślebioda
- Jacek Namieśnik
2015 Journal of Chromatography & Seperation Techniques
A new analytical procedure of determination of multiresidue of pesticides based on application of the modified QuEChERS approach at the step of sample preparation and technique GC-MS/MS has been developed and applied for studies the real honey and honeybee samples. Samples were collected from northern Poland (Pomerania). The proposed procedure enables for the determination of 34 and 30 pesticides residues respectively on honey and honeybee samples.
Development of Intelligent Control for Annealing Unit to Ensure the Minimization of Retroactive Effects on the Supply Network
- Roman Hrbac
- Tomas Mlcak
- Vaclav Kolar
- Mikołaj Bartłomiejczyk
2015
Research conducted by our team focused on the development of a complete annealing unit, using modern technologies and components, such as a programmable logic controller, an industrial computer and microcontrollers, ensuring an intelligent way to control power semiconductor elements (SSR relays), with regard to minimizing retroactive effects on the supply network. This modern configuration offers a number of new possibilities of annealing unit control, including its remote control with the use of Internet connection. Another important part is the industrial PC with touch control. Together with the visualization system, it provides a comfortable environment for clear and simple input of parameters and commands to control the annealing process. Algorithms for two control methods were implemented, i.e. phase and full-wave control. The newly developed full-wave switching algorithm ensures an even distribution of performance with regard to load. Using this control method nearly eliminates retroactive effects of current harmonic components. Therefore, this newly developed annealing unit may also be used in public power distribution systems, as long as required compatibility standards are observed.
Development of the sound field 3D intensity probe based on miniature microphones
- Józef Kotus
- Wiesław Moskwa
- Andrzej Czyżewski
- Bożena Kostek
2015
The engineered measuring probe uses three pairs of miniature microphones coupled. The signals from the microphones after an initial amplification are fed to differential circuits. Due to the required symmetry of the circuit it was necessary to select electronic components very carefully. Moreover, additional digital signal processing techniques were applied to avoid amplitude and phase mismatch. The view of the engineered probe is presented in photographs. Characteristics of the probe measured in an anechoic chamber are attached followed by a discussion of achieved results. The obtained results were compared with the reference USP probe, produced by the Microflown company.
Developments in manufacturing engineering and machining process planning
- Adam Barylski
- Henryk Biegalski
- Mariusz Deja
- Stefan Dzionk
- Mieczysław Siemiątkowski
2015
Current research conducted in the Department of Manufacturing Engineering and Automation is presented in the paper. This includes: abrasive cutting off, grinding with lapping kinematics, rapid prototyping and machining procrss planning. Experimental results and computer simulation are presented and analysed.
Device-independent quantum key distribution based on measurement inputs
- Ramij Rahaman
- Matthew Parker
- Piotr Andrzej Mironowicz
- Marcin Pawłowski
2015 Pełny tekst PHYSICAL REVIEW A
We provide an analysis of a family of device-independent quantum key distribution (QKD) protocols that has the following features. (a) The bits used for the secret key do not come from the results of the measurements on an entangled state but from the choices of settings. (b) Instead of a single security parameter (a violation of some Bell inequality) a set of them is used to estimate the level of trust in the secrecy of the key. The main advantage of these protocols is a smaller vulnerability to imperfect random number generators made possible by feature (a). We prove the security and the robustness of such protocols. We show that using our method it is possible to construct a QKD protocol which retains its security even if the source of randomness used by communicating parties is strongly biased. As a proof of principle, an explicit example of a protocol based on the Hardy's paradox is presented. Moreover, in the noiseless case, the protocol is secure in a natural way against any type of memory attack, and thus allows one to reuse the device in subsequent rounds. We also analyze the robustness of the protocol using semidefinite programming methods. Finally, we present a postprocessing method, and observe a paradoxical property that rejecting some random part of the private data can increase the key rate of the protocol.
Dew and hoarfrost frequency, formation efficiency and chemistry in Wroclaw, Poland
- Grzegorz Gałek
- Mieczyslaw Sobik
- Marek Błaś
- Żaneta Polkowska
- Katarzyna Cichała-Kamrowska
- Kinga Wałaszek
2015 ATMOSPHERIC RESEARCH
This article presents the results of a research study concerning a comparison of frequency, formation efficiency and basic physico-chemical properties of dew and hoarfrost in urban conditions. Longer than two-year series of measurements was carried out from 1 February 2008 to 10 March 2010 in Wroclaw, Poland. Sampling of atmospheric deposits was made by means of insulated plain passive radiative condensers, which allowed to collect 222 dew and 96 hoarfrost samples. The results indicate that the frequency of dew days was about threefold greater than hoarfrost days. The formation efficiency of both types of deposits was almost the same, and reached a mean value of about 100 mL·m−2 per day. The conducted analysis of several meteorological parameters showed that dew and hoarfrost, despite seasonal weather changes, were formed in very similar meteorological conditions. Only water vapor pressure values were in average twice higher in the case of dew and the impact of this parameter on dew and hoarfrost formation efficiency seems to be more complex than expected. The role of night duration in counterbalancing of smaller amount of available moisture in hoarfrost days is not clear. The investigation showed also, that there was an expected clear positive dependence of dew and hoarfrost formation efficiency on relative humidity, and not so evident in the case of temperature inversion, and wind velocity. The physico-chemical analysis indicated that the pH of dewwas only slightly lower than the hoarfrost ones, regardless of the deposit formation intensity. Simultaneously, the lower pH values were much more frequent in the case of dew, which resulted from more effective absorption of anthropogenic NO3 − and SO4 2− ions. For both types of deposits, the average pH was low (4.5–4.8) in relation to majority of studies reported in literature. In spite of seasonal changes of pollutant concentration, variousweather conditions and different mechanisms of pollutant absorption of dew and hoarfrost were characterized with almost identical, relatively lowcontamination—electric conductivity: 42 μS·cm−1. The dominant ions were: Ca2+, SO4 2−, NO3−, as well as Cl− (hoarfrost only), all of them predominantly of anthropogenic origin.
Dewatering of Sewage Sludge Dewatering in Reed Systems
- Hanna Obarska-Pempkowiak
- Magdalena Gajewska
- Ewa Wojciechowska
- Janusz Pempkowiak
2015 GeoPlanet: Earth and Planetary Sciences
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Diagnostic system of wheeled tractors detecting four defect's categories
- Ryszard Arendt
- Ryszard Michalski
2015
In a classical approach to damage diagnosis, the technical condition of an analyzed machine is identified based on the measured symptoms, such as performance, thermal state or vibration parameters. In wheeled tractor the fundamental importance has monitoring and diagnostics during exploitation concerning technical inspection and fault element localizations. The main functions of a diagnostic system are: monitoring tractor components which affect operation, safety, performance parameters and exhaust gas emissions; registering information about component damage; registering performance parameters at the moment of damage. The diagnostic device detects and identifies the following types of defects: functional defects (uf) which affect performance, exhaust defects (ue) which increase toxic emissions and fuel consumption, defects that jeopardize driving safety (us), defects that affect engine performance (ud). The key component of diagnostic device is on-board computer with touch screen, connected by USB/DeviceNet converter (master module) via the USB port. The CAN bus connects the interface module with one (three) slave modules collecting data from sensors installed in various locations of wheeled tractor. Slave devices acts as data concentrator units. In the paper hardware structure, developed software, basic algorithms of diagnostic system and some realized tests of a wheeled tractor are presented.
Diagnostics of historic columns using wave propagation
- Monika Zielińska
- Magdalena Rucka
2015
This paper presents a numerical analysis of elastic wave propagation in columns of historical buildings for diagnostics purposes. Numerical calculations were performed using the finite element method in the Abaqus software package. The analysis was carried out for three types of brick columns: a full column, a column filled with debris, and a column empty inside. The excitation was in the form of a wave packet and signals of propagating waves were registered at selected points. The influence of the internal structure of columns on registered signals and wave propagation maps was studied.
Diagnostyka cieplno-przepływowa turbin polegająca na doborze współczynników eksperymentalnych.
- Marta Drosińska-Komor
2015
W referacie przedstawiono sposób wykorzystania i wyznaczania eksperymentalnych współczynników prędkości do diagnostyki turbin. Współczynnikami tymi są: φ dla palisady kierowniczej oraz ψ dla palisady wirnikowej.
Diagnostyka cieplno-przepływowa turbin polegająca na doborze współczynników eksperymentalnych.
- Marta Drosińska-Komor
2015 Pełny tekst Mechanik
W referacie przedstawiono sposób wykorzystania i wyznaczania eksperymentalnych współczynników prędkości do diagnostyki turbin. Współczynnikami tymi są: φ dla palisady kierowniczej oraz ψ dla palisady wirnikowej.