2014 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2014

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Sieciowe systemy przetwarzania rozproszonego typu GRID – rozwiązania systemowe oraz przykłady aplikacyjne
- Piotr Brudło
2014
Zaprezentowano możliwości wykorzystania oraz integracji rozproszonych mocy obliczeniowych komputerów Internautów w globalnej sieci www. Pokazano paradygmaty internetowego przetwarzania rozproszonego typu grid computing oraz volunteer computing. Zwrócono uwagę na istotność tego typu przetwarzania w rozwiązywaniu zagadnień wymagających bardzo dużych mocy obliczeniowych. Pokazano reprezentatywne przykłady rozwiązań systemowych tego typu. Omówiono system przetwarzania BOINC , będący modelowym systemem referencyjnym w tym zakresie oraz rozproszony system Comcute zrealizowany na Wydziale Elektroniki, Telekomunikacji i Informatyki Politechniki Gdańskiej. Pokazano również inne rozwiązania systemowe z obszaru rozważanych paradygmatów przetwarzania. Wskazano na znaczenie tych systemów po-przez pokazanie zagadnień, które są przetwarzane i rozwiązywane w ich ramach. Zwrócono uwagę na możliwości wykorzystania tego typu podejścia dla rozwiązywania szeregu problemów związanych ze złożonymi procesami oraz zagadnieniami ekonomicznymi i biznesowymi.
Silica-Based Ionogels: Nanoconfined Ionic Liquid-Rich Fibers for Headspace Solid-Phase Microextraction Coupled with Gas Chromatography–Barrier Discharge Ionization Detection
- Francisco Pena-Pereira
- Łukasz Marcinkowski
- Adam Kloskowski
- Jacek Namieśnik
2014 ANALYTICAL CHEMISTRY
In this work, hybrid silica-based materials with immobilized ionic liquids (ILs) were prepared by sol–gel technology and evaluated as solid-phase microextraction (SPME) fiber coatings. High loadings of the IL 1-methyl-3-butylimidazolium bis(trifluoromethylsulfonyl)imide ([C4MIM][TFSI]) were confined within the hybrid network. Coatings composition and morphology were evaluated using scanning electron microscopy and energy dispersive X-ray spectrometry. The obtained ionogel SPME fibers exhibited high extractability for aromatic volatile compounds, yielding good sensitivity and precision when combined with a gas chromatograph with barrier ionization discharge (GC-BID) detection. A central composite design was used for assessing the effect of experimental parameters on the extraction process. Under optimized conditions, the proposed ionogel SPME fiber coatings enabled the achievement of excellent enrichment factors (up to 7400). The limits of detection (LODs) were found in the range 0.03–1.27 μg L–1, whereas the repeatability and fiber-to-fiber reproducibility were 5.6% and 12.0% on average, respectively. Water samples were analyzed by the proposed methodology, showing recovery values in the range of 88.7–113.9%. The results obtained in this work suggest that ionogels can be promising coating materials for future applications of SPME and related sample preparation techniques.
Silniki indukcyjne wielofazowe – zalety i wady w porównaniu z silnikami klasycznymi
- Piotr Drozdowski
- Grzegorz Andrzej Kostro
- Mieczysław Ronkowski
2014
W artykule przedstawiono zalety i wady silników indukcyjnych/asynchronicznych klatkowych z uzwojeniami stojana o liczbie pasm fazowych większej od 3. Porównano możliwości kształtowania rozkładu indukcji magnetycznej w szczelinie roboczej silników trójfazowych i wielofazowych. Pokazano również możliwości kształtowania charakterystyk i właściwości ruchowych silników wielofazowych. Silniki wielofazowe posiadają cechy, których nie mają silniki o liczbach pasm fazowych stojana równych 2 lub 3. Zwiększona liczba pasm fazowych silnika indukcyjnego umożliwia: zredukowanie amplitudy i zwiększenie częstotliwości pulsacji momentu elektromagnetycznego, obniżenie poziomu amplitudy wyższych harmonicznych, obniżenie prądu fazowego bez konieczności powiększenia napięcia fazowego, zmniejszenie pulsacji prądu źródła, zwiększenie niezawodności i powiększenie mocy maszyny przy tej samej masie (objętości). Ze względu mniejszą zawartość wyższych harmonicznych w rozkładzie indukcji magnetycznej w szczelinie roboczej, maszyny wielofazowe mogą uzyskiwać wyższe sprawności. Ponadto, silniki wielofazowe mogą, w odróżnieniu od silników klasycznych, pracować przy wyłączeniu części pasm fazowych uzwojenia stojana.
Siły występujące w procesie nagniatania tocznego i ślizgowego
- Stefan Dzionk
- Bogdan Ścibiorski
- Piotr Waszczur
- Włodzimierz Przybylski
2014 Full text Mechanik
W artykule przedstawiono wyniki z badań eksperymentalnych dotyczących analizy sił nagniatania tocznego i ślizgowego kulkami ceramicznymi wałków ze stali Cf53 w stanie utwardzonym. W przypadku nagniatania tocznego zastosowano docisk hydrostatyczny, natomiast podczas nagniatania ślizgowego docisk sprężysty elementu roboczego. W obu przypadkach siły pomierzono stosując czujnik siły firmy Kistler. W badaniach analizowano zmiany występujących sił podczas nagniatania powierzchni walcowych. Rezultaty badań przedstawiono w postaci wykresów zmian sił w trakcie procesu.
Simple design criteria and efficiency of hydrodynamic vortex separators
- Marlena Gronowska-Szneler
- Jerzy Sawicki
2014 WATER SCIENCE AND TECHNOLOGY
Vortex separators are locally applied for waste water treatment in different systems - from storm waste water sewerage to water treatment in fish ponds. However, the methods for separator design presented in the literature are questionable. The paper presents two simple and functional criteria that were employed to construct a laboratory test stand. The test results gave positive feed back on the efficiency of vortex separators.
Simulation of large thrust-bearing performance at transient states, warm and cold start-up
- Piotr Pajączkowski
- Andreas Schubert
- Michał Wasilczuk
- Michał Wodtke
2014 PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
The start-up of a large hydrodynamic thrust bearing of a vertical hydrogenerator is one of the most critical situations during the lifetime of a bearing. Hydrodynamic load capacity is low due to low speed and higher thermal deformations of the pad. A new approach to the simulation of a hydrodynamic bearing is shown in this article. A combination of finite elements method and computational fluid dynamics is used to perform the transient simulation of the bearing start-up. A bidirectional bearing of a pump-storage power plant is investigated. To show the potential advantages of the new method, a comparison of the warm and cold start procedure is presented. The thermal crowning of the bearing pad, oil film gap and other parameters of both cases are compared in this article.
Simulation of Parallel Applications on Large-scale Distributed Systems
- Paweł Rościszewski
- Piotr Sidorczak
2014
This chapter has a form of a review article in the field of simulating High-Performance Computing systems. We justify the need for a new versatile simulator considering heterogeneity, energy efficiency and reliability of HPC systems. We sketch the problems that need to be solved by such simulator and rationalize using discrete-event simulation for this purpose. Based on a review of existing discrete-event HPC simulation solutions we propose a flexible application execution model. Finally, we outline new directions of developing the methods to generate the traces of distributed application executions.
SIMULATION OF PROCEED® SURGICAL MESH APPLIED TO VENTRAL HERNIA REPAIR
- Izabela Lubowiecka
- Agnieszka Tomaszewska
- Czesław Szymczak
2014
In the present research, Proceed® implant is considered. The system is subjected to short-time dynamic pressure load, similar to post-operative cough naturally occurring in human abdomen. The model refers to a clinical case of 5cm of hernia operated by Proceed implant fixed by 15 joints every 3cm around the orifice. The simulations of the implanted mesh are performed by means of the Finite Element Method. The implant is modelled as a membrane structure supported by visco-elastic springs. Elastic foundation representing the abdominal wall are also included. The finite element simulations are compared with the experiments performed on the physical models of hernia prepared with the use of porcine abdominal tissues, which supports the implant membrane. In the study the maximum value of the pressure equal to 43,34 kPa has been applied in the experiment and simulation. The appropriate Rayleigh damping parameters were included in the model. The good accordance of calculated and experimental results assures the model accuracy. The forces in joints can be calculated and compared with the tissue-implant joints strength and thus to estimate the hernia repair persistence. The proposed model and its finite element implementation and simulation can be applied drawing hints in planning the surgery with the use of Proceed implant.
Simulation of the Remanence Influence on the Transient States of the Single-Phase Transformer Including Feedback Preisach Model
- Andrzej Wilk
- Michał Michna
- Artur Cichowski
2014
This paper presents the results of the experimental and simulation investigation concerning the influence of remanence in the core of a single-phase transformer at the no-load transient state. Experimental studies consisted of the discharge of the capacitor through the primary winding at several different values of the residual magnetic flux. The paper presents a model of the transformer test system, taking into account the magnetic hysteresis phenomenon based on the Preisach model with feedback. The model was used to simulate the transient and steady state of the test system, taking into account the value and the sign of the remanence in the toroidal tape wound core. It was concluded that the induction of remanence has a significant impact on the value of the inrush current. This model can be used for simulation of the transformer systems transient state, taking into account the magnetic hysteresis and the remanence
Simulation-Driven Design of Microstrip Antenna Subarrays
- Sławomir Kozieł
- Stanislav Ogurtsov
- Włodzimierz Zieniutycz
- Łukasz Sorokosz
2014 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
A methodology for computationally efficient simulation-driven design of microstrip antenna subarrays is presented. Our approach takes into account the effect of the feed (e.g., a corporate network) on the subarray side lobe level and allows adjusting both radiation and reflection responses of the structure under design within a single automated process. This process is realized as surrogate-based optimization that produces designs meeting requirements imposed on both radiation and reflection at the cost of just a few simulations of the high-fidelity model of the structure of interest. Selected optimal designs of microstrip subarrays operating at 10 GHz have been manufactured and validated by measuring their radiation patterns and reflection coefficients.
Simultaneous impedance and volumetric studies and additionally potentiodynamic polarization measurements of molasses as a carbon steel corrosion inhibitor in 1M hydrochloric acid solution
- Paweł Ślepski
- Husnu Gerengi
- Agata Jażdżewska
- Juliusz Orlikowski
- Kazimierz Darowicki
2014 CONSTRUCTION AND BUILDING MATERIALS
The inhibition effect of molasses on the corrosion of low carbon steel in 1M hydrochloric acid solution was investigated by volumetric and electrochemical measurements. Potentiodynamic polarization and dynamic electrochemical impedance spectroscopy (DEIS) results were obtained and compared with to those, obtained with the hydrogen evolution technique. All results indicate that molasses functioned as a good inhibitor in 1M hydrochloric solution and inhibition efficiency increased with molasses concentration. The advantage of DEIS as a tool for investigation of molasses influence was discussed.
Singular curves in the resultant thermomechanics of shells
- Wojciech Pietraszkiewicz
- Violetta Konopińska-Zmysłowska
2014 INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
Some geometric and kinematic relations associated with the curve moving on the shell base surface are discussed. The extended surface transport relation and the extended surface divergence theorems are proposed for the piecewise smooth tensor fields acting on the regular and piecewise regular surfaces. The recently formulated resultant, two-dimensionally exact, thermodynamic shell relations - the balances of mass, linear and angular momenta, and energy as well as the entropy inequality – are completed by the corresponding jump conditions at the moving (non-material) and stationary (material) singular surface curves.
Skojarzone wytwarzanie nośników energii przez urządzenia zasilane biogazem i gazem ziemnym na tle wybranych układów technologicznych oczyszczalni ścieków
- Ewa Zaborowska
2014 Instal
W artykule przedstawiono charakterystykę eksploatacyjną układów kogeneracyjnych zasilanych biogazem i gazem ziemnym, zainstalowanych w komunalnej oczyszczalni ścieków. Na podstawie wyników uzyskanych w wybranym roku eksploatacji pokazano zmienność zapotrzebowania i struktury bilansu energii oczyszczalni w poszczególnych miesiącach roku. Wykazano wpływ gospodarki osadowej na wskaźniki zapotrzebowania na energię elektryczną i ciepło. Porównano udziały energii skojarzonej w bilansie energetycznym oczyszczalni stosującej rolnicze wykorzystanie przefermentowanego osadu oraz prowadzącej suszenie osadu przeznaczonego do termicznej utylizacji.
SKUTECZNOŚĆ DZIAŁANIA 5-FLUOROCYTOZYNY W STOSUNKU DO KLINICZNYCH IZOLATÓW CANDIDA ALBICANS I CANDIDA GLABRATA OPORNYCH NA FLUKONAZOL
- Katarzyna Magdalena Gucwa
- Piotr Szweda
- Sławomir Milewski
2014 Dokonania Młodych Naukowców
Celem prowadzonych badań było sprawdzenie skuteczność działania 5-fluorocytozyny (5-FC) w stosunku do klinicznych izolatów C. albicans i C. glabrata wyizolowanych od pacjentów z trzech polskich szpitali. W przebadanej populacji wszystkie przebadane szczepy C. albicans były wrażliwe na działanie 5-FC, natomiast w przypadku gatunku C. glabrata wystąpiły 3 szczepy oporne i 4 średniooporne. Zjawisko nabywania lekooporności jest coraz większym problemem w polskich szpitalach. Pojawia się ono szczególnie w przypadkach nadużycia w profilaktyce i lecznictwie danego środka chemoterapeutycznego. 5-fluorocytozyna okazuje się być skutecznym lekiem przeciwgrzybicznym, lecz w celu przeciwdziałania nabywania oporności na ten lek korzystne byłoby stosowanie go wraz z innymi związkami o działaniu grzybobójczym przykładowo z amfoterycyną B.
Sleep Apnea Detection by Means of Analyzing Electrocardiographic Signal
- Piotr Przystup
- Adam Bujnowski
- Artur Poliński
- Jacek Rumiński
- Jerzy Wtorek
2014 Advances in Intelligent Systems and Computing
Obstructive sleep apnea (OSA) is a condition of cyclic, periodic ob-struction (stenosis) of the upper respiratory tract. OSA could be associated with serious cardiovascular problems, such as hypertension, arrhythmias, hearth failure or peripheral vascular disease. Understanding the way of connection between OSA and cardiovascular diseases is important to choose proper treatment strategy. In this paper, we present a method for integrated measurements of biosignals for automatic OSA detection. The proposed method was implemented using a porta-ble device with the application of the Support Vector Machine (SVM) classifier. The specific objective of this work is to analyze the minimum set of features for the ECG signal that could produce acceptable classification results. Those features can be further expanded using other biosignals, measured by the portable SleAp device. Additionally, the influence of the body movements and positions on meas-urement results with SleAp system are presented. The proposed system could help to determine the influence of OSA on the state of the cardiovascular system.
Small and Medium-sized Enterprises in Visegrad Countries towards Internationalisation Challenges in the European Union
- Nelly Daszkiewicz
2014
The chapter characterises and compares SMEs in Visegrad Countries and their international behaviours.
Small Antenna Design Using Surrogate-Based Optimization
- Sławomir Kozieł
- Adrian Bekasiewicz
2014
In this work, design of small antennas using efficient numerical optimization is investigated. We exploit variable-fidelity electromagnetic (EM) simulations and the adaptively adjusted design specifications (AADS) technique. Combination of these methods allows us to simultaneously adjust multiple geometry parameters of the antenna structure of interest in a computationally feasible manner, leading to substantial reduction of the antenna size while maintaining acceptable reflection level. Our approach is demonstrated using a UWB monopole.
SmallAngle Neutron Scattering Study of the Structure of Mixed Micellar Solutions Based on Nonionic and Two Cationic Surfactants
- Aldona Rajewska
- Krystyna Mędrzycka
- Elżbieta Hallmann
2014 PHYSICS OF THE SOLID STATE
The aggregation in mixed water systems based on nonionic surfactant, i.e., heptaethylene glycol monotetradecyl ether (C14E7), and cationic surfactants, i.e., cetyltrimethylammonium bromide (CTAB), and cetyltrimethylammonium chloride (CTAC) has been investigated using the smallangle neutron scattering method. The preliminary results of the study of the behavior of C14E7 aqueous solutions (for a concentration of 0.17%) when adding various small amounts of classical cationic surfactants (CTAB and CTAC) have been presented.
Small-scale passive emission chamber for screening studies on monoterpene emission flux from the surface of wood-based indoor elements
- Mariusz Marć
- Jacek Namieśnik
- Bożena Zabiegała
2014 SCIENCE OF THE TOTAL ENVIRONMENT
Analysis of literature data published in the last fewyears leads to the conclusion that in the process of assessment of emission flux of organic compounds emitted from different types of equipment and finishing materials, new types of devices, among which small-scale passive emission chambers for the performance of in-situ research are designed and applied on a larger scale. These devices can be successfully used for the assessment of emission flux of organic compounds in any location of an apartment, with no interference with its normal exploitation. In the following article the possibility of application of a designed and constructed small-scale passive emission chamber for the evaluation of emission flux of organic compounds (mainly monoterpenes) emitted fromthe surface ofwood-basedmaterialmade of laminated chipboard has been presented. Theemission chambermade from polished stainless steel of the inner volume of 3.65 dm3 allows for the examination/assessment of emission flux from the surface of 452 cm2. A diffusive passive sampler was installed inside of the small-scale chamber, which enables collecting samples of the analytes emitted from the examined surface of indoor material. The working time of the passive emission chamber equaled 300 min. The results of preliminary studies show that, the constructed device can be successfully used for screening studies, related with the determination of emission flux of monoterpenes from any type of wood-based flat surface located indoors
SMAQ - A Semantic Model for Analitical Queries
- Teresa Zawadzka
2014
While the Self-Service Business Intelligence (BI) becomes an important part of organizational BI solutions there is a great need for new tools allowing to construct ad-hoc queries by users with various responsibilities and skills. The paper presents a Semantic Model for Analytical Queries – SMAQ allowing to construct queries by users familiar with business events and terms, but being unaware of database or data warehouse concepts and query languages such as MDX or SQL. The key idea of SMAQ is to provide a reference model that allows building user interfaces, even those based on natural language, inde-pendently on data models and query languages.