2019 - Repozytorium publikacji - Politechnika Gdańska

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Tożsamość i przestrzeń. Wokół gdańskich retoryk tożsamościowych
- Małgorzata Dymnicka
2019 Pełny tekst Miscellanea Anthropologica et Sociologica
W długim procesie kształtowania tożsamości Gdańska ważną rolę odgrywają pamięć i przestrzeń. W nowym dyskursie tożsamościowym nie tracą one na znaczeniu, lecz obok stałych fundamentów narracji tożsamościowej (wielokulturowość, architektura, pamięć), pojawiają się nowe opowieści miejskie obejmujące różne wymiary refleksji wskazujące na złożoność: wielowymiarowość i wielowarstwowość gdańskich tożsamości. W pamięci zbiorowej gdańszczan przechowywana jest nostalgiczna wizja miasta ze strażnikami ciągłości do których niewątpliwie należy zaliczyć przestrzeń w wymiarze architektonicznym jako element kulturowego dziedzictwa. Jednakże wobec nowych form i sposobów obcowania z miejską przestrzenią, za pomocą współczesnych technik informatycznych, podejmowane są coraz śmielsze próby budowania tożsamości Gdańska jako projektu refleksyjnego, wykraczającego poza esencjonalne treści i będące odpowiedzią na różne potrzeby tożsamościowe mieszkańców.
Tożsamość przedsiębiorcza a stereotypy płci w firmach rodzinnych
- Magdalena Licznerska
2019
This article analyses various aspects of women’s experiences in overcoming gender stereotypes that they encounter in family businesses. Historically, entrepreneurship was regarded as a male domain in the literature and entrepreneurs have traditionally been described with typical and stereotypical masculine features. When woman engages in economic activities, she must face the potential incoherence of the imagined and the actual image, conflicts and contradictions. Recently, there is more and more research and the field is evolving, both with regard to women founders of enterprises and women participated in the succession process in family firms, applying the comparative approach and assuming women as male rules’ victims. A different approach over recent times has been proposed. The experience of each women in the field of family entrepreneurship is very different from each other and only taking into account this diversity will provide general understanding of female entrepreneurship.Thus, the aim of this article is to take a voice in the contemporary debate on gender and entrepreneurship, by examining the strategies adopted by women to deal with gender stereotypes encountered while building an entrepreneurial identity in family business.
Transcriptional activity of epigenetic remodeling genes declines in keratinocytes after in vitro expansion
- Jolanta Kamińska
- Paulina Langa
- Milena Deptuła
- Jacek Zieliński
- Paweł Sachadyn
- Anna Wardowska
- Michał Pikuła
2019 Pełny tekst Advances in Medical Sciences
PURPOSE: In vitro expansion is an invaluable method to obtain keratinocytes in amounts necessary for effective transplantation therapies. In vitro cell culturing provokes questions concerning potential epigenetic alterations occurring in expanded cells in the context of usefulness for transplantation and safety. The purpose of this study was to investigate as to whether keratinocyte expansion is associated with changes in the activity of genes responsible for the maintenance of epigenetic stability. MATERIALS AND METHODS: We focussed on the transcriptional activity of genes involved in different epigenetic mechanisms including DNA methylation and histone modifications. We used quantitative real-time PCR to determine transcript levels of 16 epigenetic remodelling markers in 14 patients in the epidermal cells directly after collection and after in vitro expansion. RESULTS: We observed a remarkable decline in the transcriptional activity of the epigenetic remodelling genes following in vitro expansion, while no further fall of expression with passaging. In whole skin, we found even higher expression levels of the epigenetic markers. CONCLUSIONS: Transmission to in vitro environment challenges cellular signalling and metabolism. The regulation of epigenetic remodelling maintains the balance between cellular plasticity and phenotype deviation. This preliminary research demonstrated reduced activity of genes responsible for epigenetic modifications of DNA and histones in in vitro expanded epidermal cells. This observation indicates that epigenome re-patterning in cultured epidermal cells is significantly less intensive than in the skin. Also, this observation may imply that after adaptation to in vitro conditions, the epigenome does not undergo extensive transformation during further cultivation.
Transdermal transport of collagen and hyaluronic acid using water in oil microemulsion
- Patrycja Szumała
- Christian Jungnickel
- Katarzyna Kozłowska-Tylingo
- Bianka Jacyna
- Krzysztof Cal
2019 INTERNATIONAL JOURNAL OF PHARMACEUTICS
Collagen and hyaluronic acid (HA) are biopolymers that affect the appearance and condition of the skin. Delivery of these compounds into the skin is highly challenging since have a number of disadvantageous properties, such as high molecular weight and hydrophilicity. Here, we evaluated the transdermal penetration of low and high molecular weight collagen and HA from microemulsions. A number of microemulsion formulations, differing in the content of polymers and surfactants (i.e. penetration promoters), were used for the permeation study. In addition, a correlation was made between the composition of these microemulsions and the polymers transport efficiency. The results indicate that, microemulsions enable transdermal permeation of collagen and HA. The concentration of polymers and the solubilization capacity of microemulsions had the greatest influence on the permeation. Surprisingly, the molecular weight of polymers and the content of other components affected the size of microemulsion particles, and thus these parameters had an indirect influence on the permeation process. This study demonstrated therefore the potential therapeutic use of microemulsion with collagen and HA in improving and regenerating the barrier of aged or diseased skin.
Transfer learning in imagined speech EEG-based BCIs
- Jesus Garcia Salinas
- Luis Villaseñor-Pineda
- Carlos A. Reyes-Garćia
- Alejandro A. Torres-García
2019 Pełny tekst Biomedical Signal Processing and Control
The Brain–Computer Interfaces (BCI) based on electroencephalograms (EEG) are systems which aim is to provide a communication channel to any person with a computer, initially it was proposed to aid people with disabilities, but actually wider applications have been proposed. These devices allow to send messages or to control devices using the brain signals. There are different neuro-paradigms which evoke brain signals of interest for such purposes. Imagined speech is one of the most recent paradigms, and it is explored in this work, it consists of the internal pronunciation of a word, i.e. a subject imagines the utterance of a word without emitting sounds or articulating facial movements. Under this neuro-paradigm, to increase the initial vocabulary reducing drastically the training time using few or none new data is an open challenge. The proposed method extracts characteristic units (i.e. codewords) of the EEGs associated with the words of an initial vocabulary. Subsequently, a new imagined word is represented with these codewords, and then a classification algorithm is applied. The method was tested both, with and without calibration examples, in a 27 subjects dataset. An initial vocabulary of 4 words, with 33 epochs for each word was considered. The results were obtained by averaging the accuracies of every subject, without calibration data a 65.65% accuracy was achieved. In comparison to the baseline method, which obtained an average accuracy of 68.9%, the proposed method showed no statistical difference.
Transformatory z regulacją przekładni pod obciążeniem w systemie elektroenergetycznym
- Robert Małkowski
2019
Zmiany zachodzące w systemie elektroenergetycznym, związane między innymi ze stałym wzrostem zapotrzebowania na moc, przyłączaniem źródeł odnawialnych czy rozwojem elektromobilności, przy jednoczesnym wzroście wymagań dotyczących jakości energii elektrycznej, zmuszają operatorów sieci elektroenergetycznych do podejmowania działań zmierzających do sprostania nowym wymaganiom. Jednym z kierunków tych działań jest wykorzystanie w procesach regulacji napięcia i mocy biernej w systemie elektroenergetycznym, w szerszym niż dotychczas zakresie, transformatorów energetycznych z regulacją przekładni pod obciążeniem. Monografia stanowi syntezę aktualnego stanu wiedzy dotyczącej modeli matematycznych oraz stosowanych algorytmów regulacji transformatorów z regulacją przekładni pod obciążeniem. W kolejnych rozdziałach pracy przedstawiono sposoby wykorzystania transformatorów w głównych węzłach systemu elektroenergetycznego, a w szczególności: w węzłach wytwórczych, stacjach przesyłowych sieci najwyższych napięć oraz stacjach WN/SN (GPZ). Uzupełnieniem są opisy stosowanych algorytmów koordynacji transformatorów z zewnętrznymi źródłami mocy biernej, sąsiednimi stacjami elektroenergetycznymi, zasobnikami energii itd. Dla każdego rozważanego przypadku omówiono podstawy teoretyczne, uwarunkowania techniczne oraz aktualny stan praktyki inżynierskiej w zakresie stosowanych algorytmów regulacji. Jednocześnie w monografii zamieszczono opisy objętych ochroną patentową, autorskich algorytmów sterowania pracą transformatorów blokowych oraz transformatorów w stacjach elektroenergetycznych WN/SN. Istotną zaletą wynikającą z zastosowania przedstawionych propozycji jest możliwość zwiększenia zapasu stabilności napięciowej systemu elektroenergetycznego. Zaproponowane algorytmy zostały pozytywnie zweryfikowane w badaniach symulacyjnych, a możliwości ich praktycznego wdrożenia zostały potwierdzone w testach empirycznych, przeprowadzonych z wykorzystaniem modeli fizycznych w laboratorium LINTE^2 Politechniki Gdańskiej. W monografii zawarto również opis aktualnych trendów badawczo-rozwojowych związanych z poruszaną tematyką. W szczególności omówiono możliwości regulacyjne: transformatorów z energoelektronicznym podobciążeniowym przełącznikiem zaczepów, transformatorów hybrydowych, jak również transformatorów energoelektronicznych.
Transient response of oscillated carbon nanotubes with an internal and external damping
- Mohammad Malikan
- Rossana Dimitri
- Francesco Tornabene
2019 Pełny tekst COMPOSITES PART B-ENGINEERING
The present works aims at modeling a viscoelastic nanobeam with simple boundary conditions at the two ends with the introduction of the Kelvin-Voigt viscoelasticity in a nonlocal strain gradient theory. The nanobeam lies on the visco-Pasternak matrix in which three characteristic parameters have a prominent role. A refined Timoshenko beam theory is here applied, which is only based on one unknown variable, in accordance with the Euler-Bernoulli theory, whereas the Hamilton's principle is applied to derive the equations of motion. These are, in turn, solved for a carbon nanotube with some fixed material properties. An analytical method has been used to discretize the equations in the displacement field and time, while computing the time-response of the system. For validation purposes, the results based on the proposed formulation are successfully compared to several references. A final parametric investigation focuses on the sensitivity of the time-response of a nanotube under simple boundary conditions, to different parameters such as the length scale, the viscoelasticity coefficients or the nonlocal parameter.
Transition-Metal-Promoted Oxidative Cyclization To Give 1,2,4-Trisubstituted Carbazole Scaffolds
- Milena Witkowska
- Małgorzata Ryczkowska
- Sławomir Makowiec
2019 Pełny tekst SYNTHESIS-STUTTGART
Herein, we describe the synthesis of a 1,2,4-trisubstituted carbazole core from 5-(1H-indol-3-yl)-3-oxopentanoic acid esters or amides. For oxidative cyclization, we tested two different approaches. First, we used manganese triacetate as a conventional moderate oxidizer to ensure the radical course of the reaction. Second, we examined the use of a more complex oxidizing agent I2/Me(OTf)3. In both cases, formation of a fused-ring carbazole system with a 2-hydroxyl and 1-carboxylic substituent were observed. In connection with the formation of an unexpected reaction intermediate, mechanistic aspects of the process were discussed.
TRANSMISJA GŁOSOWYCH KOMUNIKATÓW DROGOWYCH W RADIOFONII CYFROWEJ DAB+
- Przemysław Falkowski-Gilski
- Stefan Brachmański
- Andrzej Dobrucki
2019 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
Proces cyfryzacji radia jest nowym rozdziałem w historii radiofonii. Wiele rekomendacji i badań naukowych wskazuje na standard DAB+ (Digital Audio Broadcasting plus), który w niedalekiej przyszłości ma zastąpić analogową radiofonię FM. Ten system cyfrowy wprowadza wiele zmian, oferując przy tym lepszą jakość dźwięku oraz szereg usług dodatkowych. W pracy postanowiono zbadać minimalną wymaganą przepływność bitową potrzebną do transmisji głosowych komunikatów drogowych w ramach radiofonii cyfrowej DAB+.
Transportable, Portable and Micro Gas Chromatographs
- Zygfryd Witkiewicz
- Waldemar Wardencki
2019 Analitycal Chemistry: An Indian Journal
Significant benefits can be obtained by miniaturization of conventional benchtop gas chromatographs. The attractive features arising from miniaturization include low-power requirements, low heat capacity of separation columns, low consumption of mobile phase, enhanced performance, higher portability, and easily coupling to detectors and secondary chromatographic systems. In separation sciences, including gas phase separations, the downsizing of the main components of laboratory instruments is increasingly investigated to obtain high performance separation systems. This review covers the important advances in downsizing of laboratory gas chromatographic systems. The paper briefly describes a key components of micro Gas Chromatograph (μGC) systems: injectors/preconcentrators, columns and detectors, and characterizes the whole modern portable and transportable gas chromatographs with emphasis on their connection with mass and ion mobility spectrometers (MS and IMS). The idea of microfabrication of chromatographic columns, based on Microelectromechanical Systems (MEMS) technology, and a brief history of the miniaturized GC systems are presented. The examples of applications of mobile gas chromatographs together with their analytical characteristics are given.
Travelling Architecture: Vanishing heritage of Gypsy caravans in Poland
- Lucyna Nyka
- Jakub Szczepański
2019 Pełny tekst ISVS e-journal
The wandering Gypsy/Roma groups began arriving in the territory of Poland in the fifteenth century. Leading a nomadic life, they did not develop any form of a built house until the nineteenth century, until the first wooden caravans appeared. In the twentieth century, the architecture of Gypsy caravans began to thrive. They developed into several different forms of meticulously decorated wooden mobile houses. At the same time however, the introduction of a new law imposed a ban on wandering, which forced Gypsies to abandon their nomadic lifestyle. Deserted caravans gradually vanished from the landscape. This paper presents an inventory of original wagons based on the archives and literature studies,as well as on-site analysis of their structures and details. It proposes a hypothetical reconstruction drawing for one exemplary non-existent wagon illustrated in the archive photograph from the first decades of the twentieth century.
Treatment of landfill leachate in a constructed free water surface wetland system over a decade – Identification of disturbance in process behaviour and removal of eutrophying substances and organic material
- Sylvia Waara
- Ewa Wojciechowska
2019 JOURNAL OF ENVIRONMENTAL MANAGEMENT
An 8 ha free water surface wetland system in Örebro, Sweden, which has sediment traps followed by 10 ponds for treatment of landfill leachate in the methanogenic stage, was studied from 2003 to 2012. The wetland was irregularly loaded and the leachate characteristics showed high temporal and spatial variability, so Multivariate Statistical Process Control was chosen as the diagnostic tool for detecting anomalies prior to assessing removal efficiency for eutrophying substances and organics. Disturbances in process behaviour included those due to intermittent flow, dilution due to snowmelt, an episode of high pollutant load, and sampling technique. The wetland total nitrogen mass removal was 89%, resulting in a first order rate coefficient of 1.7 m/year. Total phosphorus mass removal was 98%, while mass reduction was lower for TOC (60%), although this was still below discharge limits. The low amount of labile organic material and phosphate are probably the main reasons for the low denitrification rate.
Treatment of malodorous air in biotrickling filters: A review
- Piotr Rybarczyk
- Bartosz Szulczyński
- Jacek Gębicki
- Jan Hupka
2019 BIOCHEMICAL ENGINEERING JOURNAL
Odour nuisance, resulting mainly from the presence of the compounds containing osmophore group and characterized by low olfactory threshold, is associated with danger and may be the cause of negative psychosomatic symptoms. Among different methods of malodorous air treatment, biological methods are of importance, mainly due to reduced operating costs, high purification efficiency of voluminous gas streams characterized by low concentrations of odorants and minute secondary pollution. Recently, biotrickling filtration has been one of the most attractive biological technique of air deodorization. This paper reviews the state-of-the-art on biotrickling filtration and special attention is paid to the methods for evaluation of the process performance. The review presents the range of odorous chemical compounds that may be removed from air in BTFs, highlighting the strategies for the removal of hydrophobic odorous air pollutants. The paper is focused on the literature references regarding biotrickling filtration for the years 2010–2018.
Treatment Wetland effluent quality improvement by usage sorbents of various origin
- Magda Kasprzyk
2019 Pełny tekst E3S Web of Conferences
TWs are finding as low-cost and also effective system to treat domestic wastewater. The aim of this study is to find suitable adsorbing material for application in an additional treatment unit where treatment wetlands do not provide sufficient PO4 3- reduction level. Material M1 is a fine-grained by-product of thermal treatment of carbonate-siliceous rock (opoka) with high content of calcium carbonate CaCO3 in temperature 700°C. Particular disadvantage of material M1 can be very high level of pH (11-12) and causing alkaline solution. Material M2 is lanthanum-modified bentonite (LMB) and was already used for reducing content of phosphorus compounds in lakes and other water bodies to treat effects of eutrophication process. Lanthanum-modified bentonite consists mostly SiO2 and Al2O3 (~80%). The study was conducted on effluent from small (60 pe) treatment wetland (TW) in northern Poland where Hybrid Treatment Wetland (HTW) system was provided. Sorption capacity of material M1 was low and equal 0.9 mg/g. For material M2 this parameter reached value of 2.1 mg/g. Lanthanum-modified bentonite (M2) has shown better abilities to reduce phosphates from wastewater that material M1 – material containing mostly calcium oxide. Also performed study revealed that presence of others contaminations in wastewater is causing difficulties in phosphates removal
Trees as a Shading System for Streets on the East–West Axis: Computer Simulations for the Selected Geometrical Proportions of Building Developments in Humid Continental Climate
- Katarzyna Zielonko-Jung
- Justyna Janiak
2019 Pełny tekst Sustainability
The study is aimed at investigating the possibilities for solar protection provided to the street canyon located on the E–W axis and with the following proﬁles: shallow (height/width (H/W) = 0.2, 0.6, and 1) and deep (H/W = 2) by two rows of trees located at a distance of 3 m away from southern and northern façades. The research was based on numerical simulation analyses conducted in the Rhinoceros® program, with the application of the Ladybug Tools environmental plugin for a street set in the city of Płock (52◦ 32050”N 19◦42000”E) for the day characterized with the highest total intensity of insolation within the year, 7 June, between 8:00 a.m. and 5:00 p.m. The research yielded no diﬀerences in terms of shading the surface of the southern façade of streets with low, medium, and high building developments. However, slight diﬀerences (40 m2) were noted for the model with highrise building developments (h = 60 m) characterized with a deep section (H/W = 2). The simulation also revealed that the H/W ratio parameter only slightly (0.88%–1.93%) aﬀected the share trees have in shading the street ﬂoor, except in the case of very shallow proﬁles (H/W = 0.2).
Tuning of the Electrochemical Properties of Transparent Fluorine-doped Tin Oxide Electrodes by Microwave Pulsed-plasma Polymerized Allylamine
- Anna Cirocka
- Dorota Zarzeczańska
- Anna Wcisło
- Jacek Ryl
- Robert Bogdanowicz
- B. Finke
- Tadeusz Ossowski
2019 Pełny tekst ELECTROCHIMICA ACTA
We report here the dry, one-step, and low-temperature modification of FTO surfaces using pulsed plasma polymerization of allylamine (PPAAm). PPAAm/FTO surfaces were characterized by X-ray photoelectron spectroscopy, spectroscopic ellipsometry, and contact angles to understand the morphological, structural, and optical properties. FTO were coated with a very thin layer of adherent cross-linked, pinhole-, and additive-free allylamine plasma polymer resistant to hydrolysis and delamination, and characterized by a high density of positively charged amino groups. Electrochemical studies revealed that PPAAm/FTO electrodes show wide range pH stability and reaction rates tuned by the duration of plasma treatment. We show how the modification of plasma treatment duration between 72 s and 288 s affects the chemical structure and thickness of the obtained modification, having a strong influence on the charge transfer kinetics. In particular, XPS revealed the occurrence of the reduction processes under long-term plasma exposure proving the need for monitoring of this key factor. This covalent immobilization of amine compounds on FTO surface using rapid process in microwave pulsed-plasma makes it a promising electrode for future applications in electrochemical biosensors and optoelectronic devices
Tuning transfer function of fiber-optic Fabry-Pérot interferometer via introduction of birefringence in the cavity
- Marzena Hirsch
- Paweł Wierzba
- Małgorzata Szczerska
2019 Pełny tekst OPTICA APPLICATA
The study investigates the impact of birefringence exhibited by the cavity material of a fiber-optic Fabry-Pérot interferometer on its transfer function. The theoretical approach to analyze the effect of birefringence in the cavity of a plane Fabry-Pérot interferometer is described. The case of high- and low-finesse interferometer is investigated. It is shown that introduction of a birefringent medium of optimized parameters can be used to increase the density of interference fringes in certain wavelength range - the feature can be used either for reduction of the cavity length in interferometric sensor or operation with sources of narrower spectral characteristic.
Twitter jako narzędzie wspierające działania promocyjne szkół wyższych. Przykład Biblioteki Politechniki Gdańskiej
- Urszula Szybowska
2019 Pełny tekst
Serwis społecznościowy Twitter wydaje się być skutecznym narzędziem wspierającym nie tylko promowanie dorobku poszczególnych pracowników naukowych uczelni. Może być on także wykorzystywany do prowadzenia działań upowszechniających, promujących i popularyzujących wyniki działalności badawczo-rozwojowej, innowacyjnej i wynalazczej szkół wyższych w skali krajowej oraz międzynarodowej. Biblioteka akademicka może stanowić ważne wsparcie w procesie upowszechniania dorobku naukowego uczelni i jej pracowników, podejmując różnego charakteru aktywności, także te związane z nowymi mediami. Dobrym przykładem takich praktyk są działania podejmowane przez Bibliotekę Politechniki Gdańskiej w zakresie promowania macierzystej uczelni na Twitterze.
Two- and three-dimensional elastic networks with rigid junctions: modeling within the theory of micropolar shells and solids
- Victor Eremeev
2019 Pełny tekst ACTA MECHANICA
For two- and three-dimensional elastic structures made of families of flexible elastic fibers undergoing finite deformations, we propose homogenized models within the micropolar elasticity. Here we restrict ourselves to networks with rigid connections between fibers. In other words, we assume that the fibers keep their orthogonality during deformation. Starting from a fiber as the basic structured element modeled by the Cosserat curve beam model, we get 2D and 3D semi-discrete models. These models consist of systems of ordinary differential equations describing the statics of a collection of fibers with certain geometrical constraints. Using a specific homogenization technique, we introduce two- and three-dimensional equivalent continuum models which correspond to the six-parameter shell model and the micropolar continuum, respectively. We call two models equivalent if their approximations coincide with each other up to certain accuracy. The two- and three-dimensional constitutive equations of the networks are derived and discussed within the micropolar continua theory.
Tworzenie modelu pojęciowego dla zarządzania ryzykiem na przykładzie procesu laminowania w stoczni jachtowej
- Anna Dembicka
- Tacjana Niksa-Rynkiewicz
- Katarzyna Mołas
- Paweł Szalewski
2019 Problemy Jakości
Celem artykułu jest zaproponowanie modelu pojęciowego normalizującego kryteria oceny ryzyka w systemie zarządzania jakością w stoczni jachtowej. Zamiarem jest przeprowadzenie analizy danych, pozwalającej wytyczyć zbiory o wysokim, średnim i niskim poziomie istotności dla wszystkich błędów powstających w procesie laminowania. W artykule skoncentrowano się na najważniejszych pojęciach związanych z ryzykiem i kryteriami jego oceny. Opracowany model pojęciowy został poddany analizie i posłużył do badań, uwzględniając 4 typy jachtów, zawierających łącznie 1450 próbek.