2018 - Repozytorium publikacji - Politechnika Gdańska

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Towards Understanding of Mechanics of Hernia Managed by Synthetic Mesh in Laparoscopic Operation: A Single Case Study
- Agnieszka Tomaszewska
- Izabela Lubowiecka
- Czesław Szymczak
2018 Advances in Intelligent Systems and Computing
In this paper a research towards understanding of mechanics of ventral hernia operated with the use of Physiomesh Open image in new window implant and SecureStrap Open image in new window staples is described. Experimental and numerical studies are conducted for that purpose. Experimental works cover uni-axial tension tests of the implant samples and of the implant-staples-tissue system. Also experiments on implant-staples-tissue models, representing operated hernia, subjected to impulse pressure loading are performed. Based on that, constitutive model of the mesh has been identified and failure load of the staples has been determined. In the experiments on the operated hernia systems subjected to pressure loading safe loading level has been determined and failure modes connected to higher pressure values have been observed. Finally, in the numerical simulations of the operated hernia model, built according to FEM rules, it has been proved that failures observed experimentally result from exceeding of the load bearing capacity of the staples considered in this study.
Tożsamość i przynależność do miasta w dobie globalizacji
- Małgorzata Dymnicka
- Paweł Starosta
2018 Pełny tekst Miscellanea Anthropologica et Sociologica
Celem naszej wypowiedzi jest próba przedstawienia wybranych koncepcji przynależności i tożsamości w miastach doby globalizacji. We współczesnej socjologii, zwłaszcza w tych jej odmianach, które zajmują się problematyką miejską, można odnaleźć wiele istotnych ustaleń wspierających tezę, że istotę procesu globalizacji stanowi odprzestrzennienie relacji gospodarczych, społecznych i kulturowych. Globalizacja działa aktywnie również na polu kultury miejskiej, obejmując swoim zakresem tożsamości, sposoby życia, zjawisko kulturowej różnorodności i hybrydyzacji. Tożsamości miejskie częściej niż kiedykolwiek stają się przedmiotem negocjacji tego, co lokalne, z tym, co kosmopolityczne. Przynależność do miejsca z kolei to idealna sytuacja dla „nowych plemion”, czyli wspólnot tworzących się wokół podzielanych zainteresowań, przekraczających granice klasowe, geograficzne, wiekowe, kulturowe etc. Wyzwaniem dla współczesności staje się akceptacja wielu „wiosek” dających poczucie zakorzenienia i przynależności.
Trace Elements in Aquatic Environments
- Piotr Konieczka
- Bartłomiej Cieślik
- Jacek Namieśnik
2018
A trace element is defined as a chemical element whose the average concentration is less than 100 ppm (mg/kg, mg/L – in the case of a water matrix). In aquatic environments the concentrations of trace elements are usually at the level of picomoles per liter and lower. This causes extreme analytical problems, especially in situations where low content is in the range of background levels. Taking into account the role of trace elements in the environment, there are toxic ones, physiological, and inert.
Tracing financial innovation diffusion and substitution trajectories. Recent evidence on exchange-traded funds in Japan and South Korea.
- Ewa Lechman
- Adam Marszk
2018 Pełny tekst TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE
Since the rapid growth of the popularity of ETFs, the potential substitution between innovative financial products, exchange-traded funds (ETFs), and traditional investment funds (open-end and closed-end funds) is recognized as one of the most-discussed issues in the financial industry. This is the first study to empirically verify and compare the diffusion and substitution of ETFs using monthly data on their assets in two selected countries. The main aim of this paper is to provide in-depth insights into the development of innovative financial products available in two Asian economies: Japan and South Korea. The empirical study uses monthly total net assets data for 2004–2017. Our methodological framework combines models of innovation diffusion and technological substitution. The results reported in the study show that in both countries the diffusion of ETFs has occurred. The rate of diffusion and the phase of growth reached differed – in Japan the ETF market was in the early exponential growth stage, whereas in South Korea it was closer to achieving the expected maximum saturation. The results of the substitution analysis between the largest category of the innovative funds – equity ETFs and equity open-end funds clearly demonstrate that the process of “switching” from equity open-end funds into ETFs may be easily traced in both countries. Substitution processes were, however, gradual and reversals of the trajectories were noticed
Trade-offs in multiparty Bell-inequality violations in qubit networks
- Ravishankar Ramanathan
- Piotr Andrzej Mironowicz
2018 Pełny tekst PHYSICAL REVIEW A
Two overlapping bipartite binary input Bell inequalities cannot be simultaneously violated as this would contradict the usual no-signalling principle. This property is known as monogamy of Bell inequality violations and generally Bell monogamy relations refer to trade-offs between simultaneous violations of multiple inequalities. It turns out that multipartite Bell inequalities admit weaker forms of monogamies that allow for violations of a few inequalities at once. Here we systematically study monogamy relations between correlation Bell inequalities both within quantum theory and under the sole assumption of no signalling. We first investigate the trade-offs in Bell violations arising from the uncertainty relation for complementary binary observables, and exhibit several network configurations in which a tight trade-off arises in this fashion. We then derive a tight trade-off relation which cannot be obtained from the uncertainty relation showing that it does not capture monogamy entirely. The results are extended to Bell inequalities involving different number of parties and find applications in device-independent secret sharing and device-independent randomness extraction. Although two multipartite Bell inequalities may be violated simultaneously, we show that genuine multi-party non-locality, as evidenced by a generalised Svetlichny inequality, does exhibit monogamy property. Finally, using the relations derived we reveal the existence of flat regions in the set of quantum correlations.
Traffic Remapping Attacks in Ad Hoc Networks
- Jerzy Konorski
- Szymon Szott
2018 Pełny tekst IEEE COMMUNICATIONS MAGAZINE
Ad hoc networks rely on the mutual cooperation of stations. As such, they are susceptible to selfish attacks that abuse network mechanisms. Class-based QoS provisioning mechanisms, such as the EDCA function of IEEE 802.11, are particularly prone to traffic remapping attacks, which may bring an attacker better QoS without exposing it to easy detection. Such attacks have been studied in wireless LANs, whereas their impact in multihop settings is less known. We provide a definition of traffic remapping attacks, highlighting their ease of execution, and analyze their impact in multihop networks. Suitable detection methods and defense measures are also discussed and evaluated.
Train the trainer course
- Marzena Grzesiak
- Magdalena Olczyk
2018
This chapter presents the concept, evaluation and evaluation results for the train the trainer. This concept of train the trainers is prepared within Workpackage 5 of EU-funded project: MASTER BSR (Erasmus+ Strategic Partnership Programme). Due to the nature of adult learning the content is designed for the use of participatory methods (involved, active). This method uses various techniques of active learning e.g. group work, simulation or discussion. The main purpose of ‘train the trainer’ is to transfer knowledge, develop skills and competences, build up engaged attitudes among lecturers and teachers who train the craftsmen and skilled workers to master craftsmen. The target group of “train the trainer” are teachers, lecturers and instructors that train craftsmen and skilled workers for master craftsman. In the “train the trainer” seminar they should obtain additional competences. Evaluation of training concerning both quality and knowledge increase. The generic goal of most evaluations is to provide "useful feedback" to a variety of audiences including sponsors, donors, client-groups, administrators, staff, and other relevant constituencies. Most often, feedback is perceived as "useful" if it aids in decision-making. But the relationship between an evaluation and its impact is not a simple one - studies that seem critical sometimes fail to influence short-term decisions, and studies that initially seem to have no influence can have a delayed impact when more congenial conditions arise. Despite this, there is broad consensus that the major goal of evaluation should be to influence decision-making or policy formulation through the provision of empirically-driven feedback. The aim of the train the trainers evaluation is to improve training design, content and delivery. First, we want to evaluate the trainees and their reaction during training delivery. Second, the trainer work will be evaluated. Evaluation results allowed for the formulation of guidelines for improving the training.
Transcriptional profile of in vitro expanded human epidermal progenitor cells for the treatment of non-healing wounds
- Paulina Langa
- Anna Wardowska
- Jacek Zieliński
- Justyna Podolak-Popinigis
- Piotr Sass
- Paweł Sosnowski
- Karolina Kondej
- Alicja Renkielska
- Paweł Sachadyn
- Piotr Trzonkowski
- Michał Pikuła
2018 JOURNAL OF DERMATOLOGICAL SCIENCE
Background Epidermal progenitor cells (EPCs) have been under extensive investigation due to their increasing potential of application in medicine and biotechnology. Cultured human EPCs are used in the treatment of chronic wounds and have recently became a target for gene therapy and toxicological studies. One of the challenges in EPCs culture is to provide a high number of undifferentiated, progenitor cells displaying high viability and significant biological activity. Objectives The goal of this study was to characterize the in vitro cultured progenitor cells and the assessment whether the cells with the progenitor phenotype are able to enhance wound healing. Additionally, we aimed to estab lish the complete procedure of the culture, analysis and clinical application of epidermal progenitor cells. Methods In this study we present a method of cell isolation and culture followed by a technique of transplantation of the cultured cells onto the wound bed. The applied isolation technique involves two enzymatic steps (dispase, trypsin) and it is characterized with a high yield of cells. The obtained cells were cultured in vitro up to the second passage in serum-free and xeno-free keratinocytes-dedicated medium. Key stem cell markers were determined with means of flow cytometry and quantitative real-time PCR. Results The in vitro expanded cells displayed high proliferative activity without features of either apoptosis or necrosis. The flow cytometry and transcriptomic analyses showed the enhanced expression of stem cell mark ers (i.e. ΔNp63, CD29, CD49f and BNC1, CDKN1A transcripts) in the expanded cells. In the presented com passionate use study, cultured autologous cells from an oncological patient were suspended in fibrin sealant and transplanted directly to a non-healing wound, resulting in wound closure within 2 months. Conclusion The cells cultured in serum-free media display epidermal stem cells features and a potential to stimulate wound healing. This promising procedure of isolation, culture and application warrants further clinical trials in the treatment of chronic wounds.
TRANSFORMACJA ŚRÓDMIEŚCIA GDAŃSKA – WYBRANE ASPEKTY KREOWANIA NOWEGO OBLICZA CENTRUM METROPOLII
- Piotr Lorens
2018
W ramach artykułu poruszono zagadnienia związane z uwarunkowaniami oraz specyfiką kształtowania obszaru Śródmieścia Gdańska. Obszar ten – podobnie jak ma to miejsce w odniesieniu do innych dużych polskich miast – łączy w sobie funkcje centrum kształtującej się metropolii, z obszarem, o niezwykle dużej atrakcyjności turystycznej. Równocześnie wskazać można na jego specyficzne cechy, odróżniające go od innych obszarów centralnych: stanowi ono tylko jedno z szeregu ogniw centralnego pasma usługowego metropolii, dysponuje znaczącymi rezerwami obszarów rozwojowych, w jego granicach lokuje się obecnie znaczący program mieszkaniowy o charakterze śródmiejskim, a wreszcie – realizowane inwestycje w sposób znaczący zmieniają geometrię powiązań funkcjonalno – przestrzennych obszaru. Dodatkowo wskazać należy na zmieniający się w ostatnich latach kontekst ogólno-miejski i regionalny: także i w tym wypadku przekształcenia istniejących struktur i realizowane nowe inwestycje o charakterze infrastrukturalnym (i nie tylko), uznać należy za czynnik odróżniający sytuację Śródmieścia Gdańska, od obszarów centralnych innych polskich miast. Na tym tle nieco dokładnej przedstawione zostały procesy przekształceń wybranych obszarów, w tym w szczególności: transformacja Wyspy Spichrzów, rozwój Młodego Miasta, realizacja Forum Gdańsk oraz przekształcenia dzielnicy Długie Ogrody. Omówione zostały także projekty i przedsięwzięcia związane z rewitalizacją oraz przekształceniami obszarów zdegradowanych, stanowiących naturalne dopełnienie w/w przedsięwzięć, o strategicznym dla całości Śródmieścia charakterze. Podsumowaniem tych rozważań stały się refleksje Autora, dotyczące relacji pomiędzy realnie zachodzącymi procesami rozwojowymi, a koncepcjami urbanistycznymi i planistycznymi dla przedmiotowego obszaru.
TRANSMISJA KOOPERACYJNA W SIECIACH 4G I 5G
- Andrzej Marczak
2018 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
W referacie przedstawiono zagadnienia związane z transmisją kooperacyjną w sieciach bezprzewodowych czwartej i piątej generacji. Transmisja kooperacyjna polega na wykorzystaniu terminali ruchomych jako stacji przekaźnikowych w celu poprawy jakości transmisji, poprawy wydajności sieci i zmniejszenia zużycia energii.
Transmitting Alarm Information in DAB+ Broadcasting System
- Przemysław Falkowski-Gilski
2018
The main goal of digital broadcasting is to deliver high-quality content with the lowest possible bitrate. This paper is focused on transmitting alarm information, such as emergency warning and alerting, in the DAB+ (Digital Audio Broadcasting plus) broadcasting system. These additional services should be available at the lowest possible bitrate, in order to provide a clear and understandable voice message to people. Furthermore, additional information should not put stress on the ensemble management process, nor affect full-time audio services.
Transport i obróbka przedmiotów na docierarkach tarczowych
- Adam Barylski
2018 Pełny tekst Autobusy. Technika, Eksploatacja, Systemy Transportowe
Docieranie i szlifowanie należy do podstawowych metod obróbki wykończeniowej. Technologie te stosowane sa obecnie zarówno w obróbce elementów metalowych, jak i niemetalowych. W artykule przeanalizowano czas jaki jest potrzebny do wykonania tych operacji.
Treatment of bitumen post oxidative effluents by sulfate radicals based advanced oxidation processes (S-AOPs) under alkaline pH conditions
- Andre Fernandes
- Patrycja Makoś
- Grzegorz Boczkaj
2018 JOURNAL OF CLEANER PRODUCTION
Sulfate radicals based Advanced Oxidation Processes (S-AOPs), namely Persulfate and peroxymonosulfate, were used for the treatment of post oxidative effluents from a production of petroleum bitumens under alkaline pH. Studies on the identification and monitoring of the volatile organic compounds (VOCs) along with COD, BOD and sulfide ions reduction were performed. Persulfate with a ratio between the oxygen from the oxidant and the COD in the effluents (rox) of 1.28 at 60 °C achieved 33% and 55% reduction of COD and BOD respectively. Peroxymonosulfate with a rox of 1.43 at 60 °C was the most effective S-AOP studied with 43% COD and BOD reduction. Sulfide ions were effectively oxidized in both technologies. Persulfate at lower rox 0.41 at 40 °C was the best process to treat VOCs. A detailed analysis of the effluents composition after treatment revealed VOCs by-product formation. Economical evaluation revealed that persulfate based processes were cheaper. Activation of PS and PMS by heat can occur but effectiveness of this method of activation is low. S-AOPs revealed to be effective as a pre-treatment method in terms of VOCs degradation. These studies also proved that a secondary treatment is mandatory for a cleaner production of petroleum bitumens.
Triangulation-based Constrained Surrogate Modeling of Antennas
- Sławomir Kozieł
- Ari Sigurdsson
2018 Pełny tekst IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Design of contemporary antenna structures is heavily based on full-wave electromagnetic (EM) simulation tools. They provide accuracy but are CPU-intensive. Reduction of EM-driven design procedure cost can be achieved by using fast replacement models (surrogates). Unfortunately, standard modeling techniques are unable to ensure sufficient predictive power for real-world antenna structures (multiple parameters, wide parameter ranges, highly-nonlinear responses). Here, a design-oriented modeling technique is introduced, in which the most critical part is the domain definition. The surrogate is constructed in the region based on a set of reference designs, optimized with respect to userselected figures of interest such as operating frequencies, bandwidth, substrate permittivity, etc. The domain is spanned by the simplexes, obtained by triangulation of the reference designs, further extended into their orthogonal complements. Restricting the model domain as above permits dramatic reduction of the number of training data samples necessary to build a reliable model, as compared to the conventional approach. The proposed modeling framework is demonstrated using three examples, a UWB monopole, and two dual-band antennas. Comprehensive benchmarking as well as application studies and experimental verification are also provided.
Tribo-Environment Dependent Chemical Modification of Sliding Interfaces in Ultrananocrystalline Diamond Nanowall Film: A Correlation with Friction and Wear
- Revati Rani
- Kalpataru Panda
- Niranjan Kumar
- Sankaran Kamatchi
- Ramanathaswamy Pandian
- Mateusz Ficek
- Robert Bogdanowicz
- Ken Haenen
- I-Nan Lin
2018 Pełny tekst Journal of Physical Chemistry C
Tribological properties of ultrananocrystalline diamond nanowall (UNCD NW) films were investigated quantitatively in three different and controlled tribo-environmental conditions, proposing the passivation and graphitization mechanisms. However, these mechanisms are rather complicated and possibly can be understood in well-controlled tribological conditions. It was shown that the friction and wear of these films were high in highPage 1 of 40 ACS Paragon Plus Environment The Journal of Physical Chemistry 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 vacuum and room temperature (HV-RT) tribo-condition in which the passivation of carbon dangling bonds was restricted and frictional shear-induced transformation of sp3 carbon into amorphous carbon (a-C) and tetrahedral amorphous carbon (t-aC) was noticed. However, the friction coefficient was reduced to the ultralow value in ambient atmospheric and room temperature (AA-RT) tribo-condition. Here, both passivation of dangling bonds through atmospheric water vapor and graphitization of the contact interfaces were energetically favorable mechanisms. Furthermore, the conversion of diamond sp3 into hydrogenated-graphitized phase was dominating mechanism for observed super-low friction coefficient and ultra-high wear resistance of films in high-vacuum and high-temperature (HV-HT) tribo-condition. These mechanisms were comprehensively investigated by micro-Raman and X-ray photoelectron spectroscopy analyses of the sliding interfaces.
TRWAŁOŚĆ PROJEKTU ERASMUS+ SP4CE - STUDIUM PRZYPADKU
- Anna Czaja
- Anna Grabowska
- Ewa Kozłowska
2018 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Projekt ERASMUS+ Partnerstwo Strategiczne na Rzecz Kreatywności i Przedsiębiorczości (ang. Strategic Partnership for Creativity and Entrepreneurship - SP4CE) dotyczył wdrażania i upowszechniania innowacyjnych rozwiązań wzmacniających współpracę europejską w dziedzinie kształcenia i szkolenia zawodowego. Działania projektowe były związane z promowaniem innowacyjnych praktyk w edukacji oraz szkoleniach poprzez wspieranie spersonalizowanych metod uczenia się, współpracy grupowej, krytycznego myślenia, strategicznego wykorzystania technologii informacyjnych i komunikacyjnych (TIK), otwartych zasobów edukacyjnych (ang. Open Educational Resources - OER), otwartego i elastycznego uczenia się, mobilności wirtualnej oraz innych innowacyjnych metod kształcenia. Uruchomiona w projekcie platforma SP4CE umożliwia interdyscyplinarną międzynarodową współpracę oraz udostępnianie materiałów szkoleniowych w pięciu językach partnerskich. Platforma wykorzystuje oprogramowanie WordPress i Moodle. Zarejestrowani użytkownicy współpracują w tzw. pokojach nauki (ang. Learning Rooms). Trwałość projektu SP4CE ilustrują pokoje nauki założone i aktywne również po jego zakończeniu. Są one dostępne w następujących kategoriach: SPADE ERASMUS+, Prace naukowe, Gamifikacja w szkoleniach, Autoryzowane Centrum Szkolenia Autodesk Politechniki Gdańskiej, Współpraca Partnerów Akademickich Autodesk.
Trzmiele- ważne owady zapylające. Wykorzystanie jako organizmów wskaźnikowych- wyzwanie dla analityków.
- Żaneta Bargańska
- Jacek Namieśnik
2018 Analityka: Nauka i Praktyka
Większość roślin do wydania owoców i nasion wymaga zapylenia przez owady, które w poszukiwaniu pokarmu- nektaru i pyłku- przenoszą go z jednego kwiatu na drugi. Tak jest w przypadku drzew i krzewów owocowych, a także wielu warzyw. Rośliny , pomimo obfitego kwitnienia wiosną, bez pomocy owadów nie wydadzą plonu latem. W krajobrazie rolniczym zapylenie roślin uprawnych jest tak samo ważnym czynnikiem plonotwórczym, jak nawożenie lub ochrona upraw przed szkodnikami i chorobami. Zatem owady zapylające są istotnym czynnikiem gwarantującym rozmnażanie i przetrwanie wielu gatunków roślin. Zbyt mała ilość tych owadów w sadach, uprawnych krzewów owocowych, roślin dyniowatych czy też pomidorów powoduje gorsze wykształcenie owoców i gorszą jakość nasion.
TS-based RSM-aided design of cold-formed steel stiffened C-sectional columns susceptible to buckling
- Patryk Deniziak
- Karol Winkelmann
2018 Pełny tekst
The paper focuses on joint-performance analysis of a built-up cold-formed thin-walled C-sectional column with a fillister (stiffener) of the same type, interconnected with a series of bolts located along the length of the compressed members in specific spacing. The quantity of bolts and the non-connected starting distance of the fillister are considered random variables of the problem. Optimal distribution of joints on the stiffener is found by means of Response Surface Methodology, based on Targeted Sampling technique. The critical load of the column is the response of the random model, dependent on random input parameters. The load values are computed by means of discrete realizations of the column FE model.
TSR method for burns investigation approach
- Mariusz Kaczmarek
2018
The article presents the possibilities of applying the TSR method for the diagnosis of burn wounds. The wound area is stimulated by cold gas and a sequence of thermograms of heating the tissue is recorded. Next, TSR algorithms are used to determine the parameters that allow the wound to be classified into one of the classes: the wound heals within three weeks, the wound will not heal in three weeks. The method was validated on a series of in-vivo experiments on animals and on several clinical case.
Tuning of microstructure in engineered poly (trimethylene terephthalate) based blends with nano inclusion as multifunctional additive
- A. R. Ajitha
- V. G. Geethamma
- Mathew Lovely
- Saha Prosenjit
- Kalarikkal Nandakumar
- Thomas Sabu
- Michał Strankowski
2018 POLYMER TESTING
Immiscible blends and their composites are heterogeneous and have variable morphology due to variation in mesophase regions. Tuning, i.e. controlling the phase dimension is important, thereof we report a “super-combo” effect of multiwalled carbon nanotubes (MWCNTs) in poly (trimethylene terephthalate)/polypropylene (PTT/ PP) blend system. MWCNTs act as a good reinforcing agent and compatibilizer in the otherwise immiscible PTT/ PP blend. PTT/PP blends (with varying blend ratio and MWCNT loading) were melt mixed and later compression molded. The fabricated sheets were characterized for mechanical and morphological properties. Information regarding morphology was determined using scanning electron microscope (SEM) and transmission electron microscope (TEM). Dispersion of MWCNT in PTT was confirmed by the TEM images. Better understanding is in sighted by carrying out a correlation between mechanical properties with morphology, in-line with theoretical equations and selective dissolution experiments. Mechanical properties of all blend compositions were enhanced with the addition of 1 wt % MWCNTs, in which the blend having higher composition of PTT shows excellent mechanical properties. The addition of different MWCNTs loading in to the 90PTT/10PP composition shows a significant increase in Young's modulus and experimental values showed good alignment with theoretical values especially at lower filler loadings. Key findings from the morphology are in agreement with the mechanical properties and so we propose the super combo effect of MWCNTs as a compatibilizer and reinforcing agent for PTT/PP immiscible blend system. Through performed experiments and theoretical studies, we firmly believe that engineered composites with stabilized morphology will be a promising candidate for engineering materials with diverse applications.