2015 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2015

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Thermal Decomposition of Carbamoyl Meldrum’s Acids: A Starting Point for the Preparation of 1,3-Oxazine Derivatives
- Sławomir Makowiec
- Ewelina Najda-Mocarska
- Karolina Janikowska
2015 Pełny tekst JOURNAL OF HETEROCYCLIC CHEMISTRY
The ability to undergo [4 + 2] versus [2 + 2] cycloaddition was under investigation for ketenes thermally generated from carbamoyl Meldrum’s acid. Usually, 1,3-oxazino-5-carbamoylo-4,6-diones are formed when carbamoyl Meldrum’s acid reacts with imine. However, in some cases, a reaction takes an unexpected course, leading to the formation of tetraponerines alkaloids derivatives or cyclic iminoethers.
Thermal Imaging in Wound Healing Diagnostics
- Antoni Zbigniew Nowakowski
- Mariusz Kaczmarek
- Mateusz Moderhak
- Piotr Siondalski
- Łukasz Woś
2015
Opisano wyniki projektu badawczego poświęconego opracowaniu metody obiektywnej diagnostyki ran pooperacyjnych w kardiochirurgii. Sprawdzono możliwość połączenia oceny obrazów RGB z obrazami termograficznymi oraz nową w medycynie metodą aktywnej termografii dynamicznej ADT. W projekcie zastosowano chłodzenie obszaru zainteresowania wykorzystując kriostat na dwutlenku węgla. W okresie powrotu do stanu równowagi termodynamicznej rejestrowane są zmiany rozkładów temperatury na powierzchni klatki piersiowej wykorzystując kamerę termograficzną. Rejestrowane procesy termiczne są zamodelowane w postaci zależności dwueksponencjalnej oraz znormalizowanego modelu jednoeksponencjalnego. Parametry tych modeli potraktowano jako deskryptory klasyfikacyjne, pozwalające na ocenę stanu rany pooperacyjnej. Jako parametry najlepiej charakteryzujące proces gojenia ran wybrano termiczne stałe czasowe. Najwyraźniejsze zmiany wykazuje druga, dłuższa stała czasowa modelu dwueksponencjalnego. Kryterium decydującym o wypisaniu pacjenta do domu lub pozostawienia w szpitalu w celu dalszego leczenia jest różnica pomiędzy wartościami tej stałej wyliczonej w pierwszym dniu po operacji i trzy dni później. Na podstawie 2 serii badań klinicznych z udziałem ponad 200 pacjentów każda, wykazano wartość diagnostyczną tego parametru. Propozycja dotyczy nowej, obiektywnej metody diagnostycznej, pozwalającej po raz pierwszy w kardiochirurgii na ilościowy opis procesu leczenia. Umożliwia to aparatura obrazowa całkowicie nieinwazyjna i znacznie tańsza niż CT lub MRI.
Thermal Imaging in Wound Healing Diagnostics
- Antoni Zbigniew Nowakowski
- Mariusz Kaczmarek
- Mateusz Moderhak
- Piotr Siondalski
- Łukasz Woś
2015 Pełny tekst Measurement Automation Monitoring
Results of a project searching for objective, quantitative evaluation of postoperative wound healing in cardiosurgery are presented. We propose simple thermal models of the healing processes after cardiosurgery interventions as objective descriptors allowing classification of patients for extraction and following recovery at home or for prolonged treatment in a hospital. Classification of healing as the normal process or as a process with complications is possible based on temporal changes of proposed thermal descriptors.
Thermal Self-Action of Acoustic Beams Containing Several Shock Fronts
- Anna Perelomova
2015 Pełny tekst Archives of Acoustics
Thermal self-action of an acoustic beam with one discontinuity or several shock fronts is studied in a Newtonian fluid. The stationary self-action of a single sawtooth wave with discontinuity (or some integer number of these waves), symmetric or asymmetric, is considered in the cases of self-focusing and self- defocusing media. The results are compared with the non-stationary thermal self-action of the periodic sound. Thermal self-action of a single shock wave which propagates with the various speeds is considered.
Thermodynamics of solid phases containing rare earth oxides
- Alexandra Navrotsky
- Wingyee Lee
- Aleksandra Dorota Mielewczyk-Gryń
- Sergey Ushakov
- Andre Anderko
- Haohan Wu
- Richard Riman
2015 Pełny tekst JOURNAL OF CHEMICAL THERMODYNAMICS
Rare earth elements (RE) are incorporated into a large variety of complex oxide phases to provide tailored mechanical, electrical, optical, and magnetic properties. Thermodynamics control phase stability, materials compatibility in use, corrosion, and transformation. This review presents, in one compilation, the thermodynamic properties of a large number of such materials and discusses systematic trends in energetics and the factors controlling stability.
Thermo-elastic non-linear analysis of multilayered plates and shells
- Agnieszka Sabik
- Ireneusz Kreja
2015 Pełny tekst COMPOSITE STRUCTURES
Geometrically nonlinear FEM analysis of multilayered composite plates and shells is performed in order to resolve the stability problem of the structures being under the influence of temperature field. The Riks-Wempner-Ramm algorithm with a specially modified multi-choice unloading condition has been implemented in authors’ numerical code. As the representation of multilayered medium the Equivalent Single Layer approach with the First Order Shear Deformation kinematics is employed. The effectiveness of the proposed model is examined in numerical examples with reference solutions available in the literature. Presented study proves that the proposed approach can be very effective in the analysis of stability of thin-walled thermally loaded panels.
Thermostability and photophysical properties of mixed-ligand carboxylate/benzimidazole Zn(II)-coordination polymers
- Bráulio Barros
- Jarosław Chojnacki
- Antonia Macêdo
- Joanna Kulesza
- Leonis Lourenço
- Severino Alves Junior
2015 MATERIALS CHEMISTRY AND PHYSICS
The reaction between Zn(NO3)2*6H2O or Zn(CH3COO)2*2H2O and isophthalic acid (1,3-H2bdc) in the presence of benzimidazole (Hbzim) in dimethylformamide (DMF)/ethanol (EtOH)/H2O solvent mixture at room temperature yielded two structurally different coordination polymers: [Zn2(1,3-bdc)2(Hbzim)2] (1) and [Zn2(1,3-bdc)(bzim)2] (2). (1) is a 2D-layered framework with a molecule of benzimidazole coordinated to the Zn center, whereas (2) is a 3D framework with benzimidazolate species acting as a coligand and bridging two Zn(II) ions. Reactions performed at 90 C led to the formation of coordination polymers structurally similar to (2), independently of the Zn(II) source used. In the absence of benzimidazole, the reaction between ZnAc2.2H2O and 1,3-H2bdc at 90 C resulted in the formation of (3), a 3D coordination polymer Zn(HCOO)3(Me2NH2 þ). It was observed that the thermostability and the photophysical properties of (1) and (2) are strongly dependent on the coordination modes and packing of benzimidazole in the solid state. These materials present photoluminescence in the wide range of the spectrum, from UV to IR. A full understanding of a physical process occurring in these intriguing systems, including complete energy level diagrams with possible transitions were provided.
Thin layer of ordered boron-doped TiO2 nanotubes fabricated in a novel type of electrolyte and characterized by remarkably improved photoactivity
- Katarzyna Siuzdak
- Mariusz Szkoda
- Anna Lisowska-Oleksiak
- Katarzyna Grochowska
- Jakub Karczewski
- Jacek Ryl
2015 APPLIED SURFACE SCIENCE
This paper reports a novel method of boron doped titania nanotube arrays preparation by electrochemical anodization in electrolyte containing boron precursor – boron trifluoride diethyl etherate (BF3 C4H10O), simultaneously acting as an anodizing agent. A pure, ordered TiO2 nanotubes array, as a reference sample, was also prepared in solution containing a standard etching compound: ammonium fluoride. The doped and pure titania were characterized by scanning electron microscopy, UV–vis spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, photoluminescence emission spectroscopy and by means of electrochemical methods. The B-doping decidedly shifts the absorption edge of TiO2 nanotubes towards the visible light region and significantly inhibits the radiative recombination processes. Despite the fact that the doped sample is characterized by 4.6 lower real surface area when compared to pure titania, it leads to the decomposition of methylene blue in 93%, that is over 2.3 times higher than the degradation efficiency exhibited by the undoped material. The formation rate of hydroxyl radicals (•OH) upon illumination significantly favours boron doped titania as a photocatalytic material. Moreover, the simple doping of TiO2 nanotubes array results in the enhancement of generated photocurrent from 120 A/cm2 to 350 A/cm2 registered for undoped and doped electrode, respectively.
Three electrode configuration measurements of electrolyte-diffusion barrier-cathode interface
- Dagmara Grudzień
- Jakub Karczewski
- Aleksander Chrzan
- Piotr Jasiński
2015 Pełny tekst JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
Measurements of a system consisting of cathode/doped ceria diffusion barrier/doped zirconia electrolyte were made using two- and three-electrode configuration. Results obtained on a three-electrode measurement configuration were compared with and reflect the results obtained in two-electrode configuration. Three-electrode measurements allowed separating the impact of the symmetrical interface in the investigated system. They also enabled to obtain additional information about the investigated interface, such as the behavior of the system under an external polarization voltage. It has been shown that the 200 to 1200 nm thick CGO diffusion barrier layer fabricated by spray pyrolysis significantly reduces the polarization resistance of the interface. It also minimizes the impact of the polarization resistance in the presence of external polarization voltage.
Three phase transient model of wet coal pyrolysis
- Sylwia Polesek-Karczewska
- Dariusz Kardaś
- Przemysław Ciżmiński
- Bartosz Mertas
2015 JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
A one-dimensional transient mathematical model was developed to describe the thermal and flow phenomena during coal pyrolysis in a coke oven. The model was solved numerically using partly implicit methods for gas flow and heat transfer problems. It was successfully validated with industrial-scale measurements of temperature change in the middle-plane of the coke oven chamber. The evolution of temperature and pressure, distributions of gas and steam generation rates were presented and analyzed. Special emphasis is put on the progress of vaporization and condensation fronts and their impact on the moisture levels within the coal charge. The obtained results show that moisture content determines the coking process dynamics, lagging the temperature increase above the boiling temperature and in consequence the start up of pyrolysis. The effect of low permeability of coal in its plastic stage on the internal pressure peaks in a coke oven is discussed.
Three solvers for MIMO noise radar clutter cancellation - a performance comparison
- Michał Meller
2015
The problem of canceling strong clutter echos in a MIMO noise radar is considered. Execution times of three algorithms is compared. The first solution is a standard Least Squares approach employing Cholesky decomposition of the transmitted signal sample autocorrelation matrix. The second approach is based on careful waveform design which guarantees that the signal sample autocorrelation matrix has Toeplitz structure. This enables one to employ the Levinson recursion instead of the Cholesky decomposition. The third approach lies between the first two. It does not employ waveform design but takes advantage of almost Toeplitz structure of the autocorrelation matrix by means of a modified, Levinson-like recursion.
Thriving in multicultural work settings
- Malgorzata Rozkwitalska
- Beata Basińska
2015
Owing to globalization and the global mobility of workforce, working in multicultural environments has become a daily reality for an increasing number of manpower. Such an environment does introduce unique challenges to individuals, enabling some of them to thrive. The aim of the paper, therefore, is to explore the antecedents of thriving and its components in multicultural work settings of multinational corporations (MNCs). The in-depth interviews with 38 informants were conducted to analyze intercultural interactions in 2 MNCs’ subsidiaries. The study demonstrates that those individuals who thrive in MNCs assess their specific job demands as challenges. Moreover, thriving people activate their personal resources to face their challenges, which in return enhances their learning and personal growth. The learning component of thriving appeared to be more salient than vitality. The research may suggest that managers of MNCs should recruit employees whose need for growth is well-developed, since those individuals can benefit more from multicultural work 2 settings and thrive. International experience and psychological capital are the additional factors here that may foster employees’ thriving. To the best of our knowledge this is the first research that explores thriving in multicultural work context. It looks at the antecedents of thriving with the Positive Organizational Scholarship lens. Nevertheless, the study is based on the qualitative methodology, which does not allow for a generalization of the findings.
TIME-AND-SPACE STRUCTURE OF FORCE-DRIVEN RIGID SPHEREWAVEFIELD
- Henryk Lasota
2015
This paper introduces a time-domain, causality-inspired description of a vector-source acoustic wavefield of arbitrary time evolution, where a sphere is a practical realisation of quasi-point contact surface without which a point force would not be able to exert an impact onto non-viscous fluid. At every space location, the resulting acoustic field is described by a pair of physical variables characterising the time evolution of fluid two-fold dynamic state, viz. particle velocity “governed” by the vector wave equation, as a leading quantity, with acoustic pressure as the accompanying quantity related to the velocity by the divergence relation. The time and space structure of the corresponding velocity-and-pressure kineto-elastic wavefield is illustrated in the paper for specific cases of source force timeforms inducing impulse-like disturbances in fluid. Dual pressure-and-velocity fundamental wavefield of quasi-point scalar source, “governed” by the scalar wave equation, is presented for the same set of excitation timeforms.
Times Series Analysis Of Road Safety Trends At The Regional Level In Poland
- Joanna Żukowska
2015 Pełny tekst Journal of KONBiN
The paper presents possibility of applying a structural times series modeling with explanatory and intervention variables as a tool capable for explaining the changes in the monthly number of fatalities and seriously injured in traffic accidents. The analysis covers regional level and takes into consideration traffic accidents data of two regions: Pomorskie and Warmia-Mazury. In addition short-term forecasts for the two regions were developed and verified.
Time-series analysis of road safety trends aggregated at national level in Europe for 2000-2010
- Ruth Bergel-Hayat
- Joanna Żukowska
2015
The reader will find in this study road safety modelling theory and time-series analysis techniques, applications to long period data of injury accidents and casualities, aggregared at national level
Tin oxide nanoparticles from laser ablation encapsulated in a carbonaceous matrix – a negative electrode in lithium-ion battery applications
- Andrzej Nowak
- Anna Lisowska-Oleksiak
- Katatrzyna SiuzdaK
- Mirosław Sawczak
- Maria Gazda
- Jakub Karczewski
- Grzegorz Trykowski
2015 RSC Advances
This report concerns carbonaceous electrodes doped with tin(II) oxide nanoparticles. Tin nanoparticles are obtained by pulsed laser ablation in water. Crystalline nanoparticles have been encapsulated in a carbonaceous matrix formed after pyrolysis of a mixture consisting of tin/tin(IV) oxide nanoparticles and gelatine. The obtained material is characterized by means of X-ray diffraction, selected area diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. Battery charging/discharging tests exhibit a capacity of 580 mA h g1 for current densities of 100 mA g1. The cycling performance of the material suggests that the tested nanocomposite can be used as an anode for lithium-ion batteries
Tire camber angle influence on tire-pavement noise
- Ryszard Woźniak
- Stanisław Taryma
- Piotr Mioduszewski
2015 NOISE CONTROL ENGINEERING JOURNAL
Taking into account tire-pavement noise and tires classification with respect to noise emission special measurement methods are usually used. When two of them are applied (the Laboratory Drum Method (DR) and the Close-Proximity Method (CPX)) the investigator has to be sure that the position of the tire is correct. The authors of this paper thought about tire position as tire (wheel) alignment in particular tire camber angle. They intended to present its influence on tire-pavement noise.
Tłuste ścieki
- Ziemowit Suligowski
2015 Magazyn Instalatora
Problemy separacji zanieczyszczeń oleistych ze ścieków wprowadzanych do publicznych urządzeń kanalizacyjnych. Ocena zagrożeń, rodzaje separatorów, ich przydatność. Problemy eksploatacji.
Tools for Automatic Wound Healing Evaluation
- Antoni Zbigniew Nowakowski
- Mariusz Kaczmarek
- Mateusz Moderhak
- Piotr Siondalski
- Łukasz Woś
2015
Final results of the research project devoted to development of a new objective and quantitative method of post cardiosurgery wound healing diagnostics, already preliminary discussed at the QIRT 2014 Conference, is presented. We assumed that thermal processes should be effective in subtle description of temporal changes of tissue thermal properties after surgical interventions. To prove this assumption more than 400 patients after cardiosurgery intervention on the open heart participated in clinical experiments using IR thermal cameras as diagnostic instrumentation. We applied both – classical thermal image capture as well as active dynamic thermography method ADT – for analysis of thermal processes existed in the vicinity of the postoperative wound. Here we concentrate on description of technical issues of the developed instrumentation and procedures applied in the research. Discussion is devoted to the problem of standardization of measurement conditions, possible hardware solutions to be applied in clinics and necessary procedures of data acquisition and processing.
TOPOLOGICAL CLUES FOR PREDICTING OUTCOMES OF MULTIPLAYER ONLINE BATTLE ARENA GAMES
- Dominik Deja
- Mateusz Myślak
2015
With 27 million people playing League of Legends every day, e-sports became more and more important part of our everyday life. Rise of its popularity builds a demand for better understanding e-sports mechanics on a deeper level. In the article, we test a hypothesis that it is possible to predict an outcome of Multiplayer Online Battle Arena game based on topological clues only (such as area of polygon where vertices are players positions, and their dispersion). With accuracy, precision, and recall around 80%, we show that it is possible to construct a model which will be both: generic for MOBA games genre, and based on simple assumptions, which are hard to be perceived by the naked eye. Results can be used for better understanding how MOBA games works, as well as for developing more player-friendly games in terms of difficulty, and time one needs to learn how to play.