2017 - Repozytorium publikacji - Politechnika Gdańska

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RAPORT-EKSPERTYZA Z POMIARÓW DRGAŃ LINII WAŁÓW NA JEDNOSTCE ORP „PIORUN”
- Zbigniew Korczewski
- Jacek Rudnicki
2017
Ekspertyza diagnostyczna dotycząca stanu technicznego lini transmisji mocy (linii wałów) opracowana na podstawie przeprowadzonych pomiarów drgań. Pomiary prędkości i przyspieszeń drgań generowanych przez węzły konstrukcyjne linii wałów okrętowego układu napędowego wykonano po naprawie głównej napędu okrętu w stoczni „NAUTA”, w celu określenia jego stanu dynamicznego. Rejestrację drgań przeprowadzono w: • płaszczyźnie pionowej (V) i poziomej (H) dławnicy wału śrubowego centralnej linii wałów, dławnicy wału śrubowego linii wałów PB i przekładni redukcyjnej, • płaszczyźnie pionowej (V) dławnicy wału śrubowego linii wałów LB (ze względu na brak możliwości montażu akcelerometru w punkcie umożliwiającym pomiar dragań w płaszczyźnie poziomej H), • osiach równoległych do osi symetrii okrętu – rejestracja drgań wzdłużnych (L) na kadłubach przekładni redukcyjnych, od strony wału śrubowego, montując czujnik akcelerometryczny za pomocą połączenia magnetycznego w bezpośredniej bliskości węzłów łożyskowych. Rejestrację drgań przeprowadzono w 14 punktach pomiarowych w IV zakresach ustalonego obciążenia. Analizę wyników pomiarów przeprowadzono zgodnie z zaleceniami normy ISO 10816.
Reactions of Lithiated Diphosphanes R2P−P(SiMe3)Li (R = tBu and iPr) with [MeNacnacTiCl2·THF] and [MeNacnacTiCl3]. Formation and Structure of TitaniumIII and TitaniumIV β‑Diketiminato Complexes Bearing the Side-on Phosphanylphosphido and Phosphanylphosphinidene Functionalities
- Łukasz Ponikiewski
- Aleksandra Ziółkowska
- Jerzy Pikies
2017 INORGANIC CHEMISTRY
β-Diketiminate complexes of TiIII-containing phosphanylphosphido ligands [MeNacnacTi(Cl){η2-P(SiMe3)- PR2}] (MeNacnac− = [Ar]NC(Me)CHC(Me)N[Ar]; Ar = 2,6- iPr2C6H3) were prepared by reactions of [MeNacnacTiCl2· THF] with lithium derivatives of diphosphanes R2P−P(SiMe3) Li (R = tBu, iPr) in toluene solutions. Surprisingly, reactions of [MeNacnacTiCl2·THF] with R2P−P(SiMe3)Li in THF solutions led to TiIV complexes containing phosphanylphosphinidene ligands [MeNacnacTi(Cl)(η2-P-PtBu2)] via an autoredox path involving a migration of a nitrene NAr from the Nacnac skeleton to the Ti centers. Solid-state structures of [MeNacnacTi(Cl){η2-P(SiMe3)-PtBu2}] (1a) and [MeNacnacTi(Cl)(η2-P-PtBu2)] (two isomers 2a1, 2a2) together with [MeNacnacTi(Cl){η2-P(SiMe3)-PiPr2}] (1b) and [MeNacnacTi(Cl)(η2-P-PiPr2)] (2b) were established by the single-crystal X-ray diffraction and display clearly side-on geometry of the (Me3Si)P−PR2 and P−PR2 moieties in the solid state. Phosphanylphosphinidene complexes [MeNacnacTi- (Cl)(η2-P-PR2)] indicate that the 31P NMR resonances of phosphinidene P atoms appear at a very low field in solution and in the solid state.
Reactions of lithiated diphosphanes R2P-P(SiMe3)LiTHF (R = tBu, iPr) with [(PNP)TiCl2]. Two different coordination types of phosphanylphosphido ligand to the metal center.
- Łukasz Ponikiewski
- Aleksandra Ziółkowska
- Mateusz Zauliczny
- Jerzy Pikies
2017 Pełny tekst POLYHEDRON
[(PNP)TiCl2] (PNP = N[2-PiPr2-4-methylphenyl]2) reacts with one equivalent of lithium derivative of diphosphane R2P-P(SiMe3)LinTHF (R = tBu, iPr) in toluene and forms the first complex with g1-coordination [(PNP)Ti(Cl){g1-P(SiMe3)-PtBu2}] (1) and complex with g2-coordination [(PNP)Ti(Cl){g2-P(SiMe3)-PiPr2}] (2) of phosphanylphosphido ligands to the titanium center. The similar reaction with two equivalents of tBu2P-P(SiMe3)LinTHF in toluene leads to solid 3 which contains 1 and excess of tBu2P-P(SiMe3)Li in the unit cell. In complex 2 disorder of the phosphanylphosphido ligand was observed. The disorder model shows that the phosphanylphosphido ligand coordinates to the metal center alternately as a bidentate and as a monodentate ligand.
Reactivation of seizure‐related changes to interictal spike shape and synchrony during postseizure sleep in patients
- Mark R. Bower
- Michał Tomasz Kucewicz
- Erik K. St. Louis
- Frederic Meyer
- W. Richard Marsh
- Matt Stead
- Gregory A. Worrell
2017 Pełny tekst EPILEPSIA
OBJECTIVE: Local field potentials (LFPs) arise from synchronous activation of millions of neurons, producing seemingly consistent waveform shapes and relative synchrony across electrodes. Interictal spikes (IISs) are LFPs associated with epilepsy that are commonly used to guide surgical resection. Recently, changes in neuronal firing patterns observed in the minutes preceding seizure onset were found to be reactivated during postseizure sleep, a process called seizure-related consolidation (SRC), due to similarities with learning-related consolidation. Because IISs arise from summed neural activity, we hypothesized that changes in IIS shape and relative synchrony would be observed in the minutes preceding seizure onset and would be reactivated preferentially during postseizure slow-wave sleep (SWS). METHODS: Scalp and intracranial recordings were obtained continuously across multiple days from clinical macroelectrodes implanted in patients undergoing treatment for intractable epilepsy. Data from scalp electrodes were used to stage sleep. Data from intracranial electrodes were used to detect IISs using a previously established algorithm. Partial correlations were computed for sleep and wake periods before and after seizures as a function of correlations observed in the minutes preceding seizures. Magnetic resonance imaging (MRI) and computed tomography (CT) scans were co-registered with electroencephalography (EEG) to determine the location of the seizure-onset zone (SOZ). RESULTS: Changes in IIS shape and relative synchrony were observed on a subset of macroelectrodes minutes before seizure onset, and these changes were reactivated preferentially during postseizure SWS. Changes in synchrony were greatest for pairs of electrodes where at least one electrode was located in the SOZ. SIGNIFICANCE: These data suggest preseizure changes in neural activity and their subsequent reactivation occur across a broad spatiotemporal scale: from single neurons to LFPs, both within and outside the SOZ. The preferential reactivation of seizure-related changes in IISs during postseizure SWS adds to a growing body of literature suggesting that pathologic neural processes may utilize physiologic mechanisms of synaptic plasticity.
Real and imaginary motion classification based on rough set analysis of EEG signals for multimedia applications
- Piotr Szczuko
2017 Pełny tekst MULTIMEDIA TOOLS AND APPLICATIONS
Rough set-based approach to the classification of EEG signals of real and imaginary motion is presented. The pre-processing and signal parametrization procedures are described, the rough set theory is briefly introduced, and several classification scenarios and parameters selection methods are proposed. Classification results are provided and discussed with their potential utilization for multimedia applications controlled by the motion intent. Accuracy metrics of classification for real and imaginary motion obtained with different parameter sets are compared. Results of experiments employing recorded EEG signals are commented and further research directions are proposed.
Real estate investment trusts in Turkey: Structure, analysis, and strategy
- Ali Hepsen
- Murat G. Berberoglu
- Olgun Aydin
2017 Pełny tekst Journal of Business, Economics and Finance
Purpose-Aim of this study is to make the determinations related to the problems mentioned in the REIT sector in Turkey, to offer a solution for this issue, and to ensure the classification in the sector by adhering to the financial data of the REITsMethodology-Financial data set of the REITs was firstly standardized by using median instead of mean. Then, the scoring was performed according to defined coefficients. After that normality test of the obtained scores was performed, the area of each score under standard normal distribution curve was calculated and the scores were moved to the 0-100‎range.‎Finally,‎scores‎were‎collected‎under‎5‎groups‎as‎“Very‎good,‎Good,‎Not‎Bad,‎Bad‎and‎Very‎Bad”‎by‎using‎k-means algorithm. Clustering were made on R Studio.Findings-Our analyses conducted that REITs traded on the Istanbul Stock Exchange are divided into two subgroups depending on their financial data.Conclusion-It will be important the REITs, in the sub-group especially in terms of the score distribution, to diversify their portfolio by extending their asset investments, to stabilize dividend payments and to take steps on institutionalization so that they are equivalentto REITs in the super-group.
Realizacja demonstratora technologicznego szybkiej transmisji danych w technologii radia programowalnego
- Krzysztof Cwalina
- Paweł Tomasz Kosz
- Piotr Rajchowski
- Jacek Stefański
- Jarosław Sadowski
2017 Elektronika : konstrukcje, technologie, zastosowania
W artykule przedstawiono realizację demonstratora technologicznego szybkiej transmisji danych w technologii radia programowalnego. Opisano architekturę zaprojektowanego systemu w tym asymetryczną organizację transmisji ramkowej, która odbiega od dotychczas stosowanych w systemach komórkowych. Przedstawiono także konstrukcję urządzeń prototypowych składających się z jednostki zarządzającej i urządzenia radia programowalnego oraz wielowątkowe oprogramowanie realizujące wszystkie funkcje protokolarne oraz systemowe.
Realizacja elementów składowych łącza radiowego z użyciem urządzeń USRP dla potrzeb szybkiej transmisji danych do zastosowań specjalnych
- Piotr Rajchowski
- Krzysztof Cwalina
- Paweł Tomasz Kosz
- Jacek Stefański
- Jarosław Sadowski
2017 Elektronika : konstrukcje, technologie, zastosowania
W artykule przedstawiono realizację cyfrowego łącza radiowego dla potrzeb szybkiej transmisji danych do zastosowań specjalnych. Opisano jego koncepcję oraz realizację praktyczną z użyciem urządzeń USRP firmy National Instruments. Przedstawiono elementy funkcjonalne opracowanego oprogramowania w zakresie generowania i odbierania sygnałów cyfrowych pasma podstawowego, wraz z opisem zastosowanych modulacji cyfrowych i metody synchronizacji czasowej i częstotliwościowej. Dodatkowo przedstawiono sposób działania łącza radiowego w rzeczywistych warunkach pomiarowych.
Realizacja mobilnego stanowiska pomiarowego do badań parametrów kanału radiowego w sieciach WBAN
- Paweł Tomasz Kosz
- Krzysztof Cwalina
- Piotr Rajchowski
2017 Elektronika : konstrukcje, technologie, zastosowania
W artykule przedstawiono realizację mobilnego stanowiska pomiarowego do badania parametrów kanału radiowego w bezprzewodowych sieciach pracujących w obrębie ciała ludzkiego przy częstotliwości 2,45 GHz. Zawarto ogólne wprowadzenie do tematyki sieci WBAN, a następnie szczegółowo opisano realizację mobilnego stanowiska pomiarowego z podziałem na poszczególne jego elementy składowe. W podsumowaniu przedstawiono kierunek dalszych prac nad mobilnym stanowiskiem pomiarowym.
Realizacja zadań w grafie przez grupę mobilnych jednostek
- Dorota Osula
2017 Pełny tekst
Grupa mobilnych jednostek, nazywanych także agentami, jest umiejscowiona w jednym lub wielu wierzchołkach grafu nazywanych bazami. Stamtąd poruszając się po z góry znanym (offline) lub nieznanym (online) grafie muszą wykonać powierzone im zadanie, takie jak przeszukanie grafu, spotkanie, dekontaminacja grafu czy wybór lidera. Celem jest znalezienie optymalnej, rozproszonej, deterministycznej strategii (sekwencji ruchów jednostek), która umożliwi realizacje zadania. Poniższy artykuł jest artykułem przeglądowym skupiającym się na najbardziej aktualnych, wybranych modelach i problemach.
Real-Time Basic Principles Nuclear Reactor Simulator Based on Client-Server Network Architecture with WebBrowser as User Interface
- Dymitr Juszczuk
- Jarosław Tarnawski
- Tomasz Karla
- Kazimierz Duzinkiewicz
2017 Pełny tekst Advances in Intelligent Systems and Computing
The real-time simulator of nuclear reactor basic processes (neutron kinetics, heat generation and its exchange, poisoning and burn- ing up fuel) build in a network environment is presented in this paper. The client-server architecture was introduced, where the server is a pow- erful computing unit and the web browser application is a client for user interface purposes. The challenge was to develop an application running under the regime of real-time, with a high temporal resolution, in an environment which is not a native real-time. The problem of a real-time operation taking into account the variable time of calculations and a communication latency was solved using the developed mechanism of step length adaptation. Results of multiple studies of a numerical com- pliance with the reference simulator proved correctness of the developed application.
Real-Time Monnitoring of Vegetable Oils' Thermal Degradation Using Proton Transfer Reaction Mass Spectrometry
- Tomasz Majchrzak
- Tomasz Dymerski
- Jacek Namieśnik
2017
The volatile aldehydes, which are generated during frying, can be harmful to human health, therefore the concentration of these compounds in frying fumes should be monitored. In addition, aldehydes are markers of oils’ quality, and so it is possible to determine shelf-life or suitability for frying of these oils. Commonly, in order to determine aldehydes concentration gas chromatography is performed, however it does not allow for real-time analysis. The aim of this work was to present the possibility of using proton transfer reaction mass spectrometry to monitor the concentration of volatile aldehydes. As a complementary technique, two-dimensional gas chromatography was used to identify the compounds. Additionally, a hierarchy cluster analysis was performed to determine the intensity of the oils oxidation.
Reasons for Implementing Movement in Kinetic Architecture
- Lucyna Nyka
- Jan Cudzik
2017
The paper gives insights into different forms of movement in contemporary architecture and examines them based on the reasons for their implementation. The main objective of the paper is to determine: the degree to which the complexity of kinematic architecture results from functional and spatial needs and what other motivations there are. The method adopted to investigate these questions involves theoretical studies and comparative analyses of architectural objects with different forms of movement imbedded in their structure. Using both methods allowed delving into reasons that lie behind the implementation of movement in contemporary kinetic architecture. As research shows, there is a constantly growing range of applications with kinematic solutions inserted in buildings’ structures. The reasons for their implementation are manifold and encompass pursuits of functional qualities, environmental performance, spatial effects, social interactions and new aesthetics. In those early projects based on simple mechanisms, the main motives were focused on functional values and in later experiments – on improving buildings’ environmental performance. Additionally, in recent proposals, a significant quest could be detected toward kinematic solutions that are focused on factors related to alternative aesthetics and innovative spatial effects. Research reveals that the more complicated form of movement, the more often the reason for its implementation goes beyond the traditionally understood “function”. However, research also shows that the effects resulting from investigations on spatial qualities of architecture and new aesthetics often appear to provide creative insights into new functionalities in architecture.
Recent developmentsinthesynthesisand biological activityofacridine/acridoneanalogues
- Monika Gensicka-Kowalewska
- Grzegorz Cholewiński
- Krystyna Dzierzbicka
2017 Pełny tekst RSC Advances
Many people in the world struggle with cancer or bacterial, parasitic, viral, Alzheimer's and other diseases. Therefore, many scientists seek new, more effective, more selective and less toxic drugs. Acridine/acridone derivatives constitute a class of compounds with a broad spectrum of biological activity and are of great interest to scientists. Todate, many acridine/acridone analogues have been obtained,which, inter alia, exhibit antitumour antimicrobial and antiviral activities and are applicable in the treatment of Alzheimer's disease. However, inmanycases, the irclinical application is limited and excluded because of side effects. In this survey, we describe acridine and acridone derivatives reported since 2013, methods of their synthesis and their potential clinical applications.
Recurrent bowel-blood translocations of Escherichia coli with the unique virulence characteristics over three-year period in the patient with acute myeloid leukaemia – case report
- Beata Krawczyk
- Anna Śledzińska
- Agnieszka Piekarska
- Andrzej Hellmann
- Józef Kur
2017 Pełny tekst JOURNAL OF APPLIED GENETICS
In patients with haematological malignancies, the bowel remains the main source of Escherichia coli bloodstream infections. We present the clinical example of recurrent bowel-blood translocations of E. coli with the unique virulence characteristics in a 55-year-old male with the diagnosis of acute myeloid leukaemia. The virulent factors profile of examined strains confirmed that the co-existence of genes papC, sfa, usp and cnf1, encoding virulence factors, predisposes E. coli to translocation from the gastrointestinal tract to the vascular bed. The close cooperation between haematologists and microbiologists is essential to improve the outcome of patients colonised with highly pathogenic strains.
Recurrent potential pulse technique for improvement of glucose sensing ability of 3D polypyrrole
- Karolina Cysewska
- Jakub Karczewski
- Piotr Jasiński
2017 Pełny tekst MEASUREMENT SCIENCE & TECHNOLOGY
In this work, a new approach for using a 3D polypyrrole (PPy) conducting polymer as a sensing material for glucose detection is proposed. Polypyrrole is electrochemically polymerized on a platinum screen-printed electrode in an aqueous solution of lithium perchlorate and pyrrole. PPy exhibits a high electroactive surface area and high electrochemical stability, which results in it having excellent electrocatalytic properties. The studies show that using the recurrent potential pulse technique results in an increase in PPy sensing stability, compared to the amperometric approach. This is due to the fact that the technique, under certain parameters, allows the PPy redox properties to be fully utilized, whilst preventing its anodic degradation. Because of this, the 3D PPy presented here has become a very good candidate as a sensing material for glucose detection, and can work without any additional dopants, mediators or enzymes.
Recycling of Polyurethanes
- Janusz Datta
- Marcin Włoch
2017
Polyurethane waste can be recycled by mechanical methods (i.e., grinding and applying as a filler or pressing with a bonding agent) and chemical methods (mainly by e.g., glycolysis, hydrolysis, or aminolysis). There is also possibility to the recover energy from polyurethanes waste (by incineration, gasification, and pyrolysis).
Recykling poliuretanów oraz poli(tereftalanu etylenu)
- Janusz Datta
- Marcin Włoch
2017
Poliuretany (PUR) oraz poli(tereftalan etylenu) (PET) stanowią zaraz obok poliolefin główne źródło odpadów z tworzyw sztucznych. Poliuretany są produkowane w formie elastomerów, elastycznych i sztywnych pianek oraz klejów i powłok. Szeroki wachlarz zastosowań poliuretanów, wynikający zarówno z ich unikalnych właściwości, jak i z możliwych form użytkowych, skutkuje rosnącym z roku na rok zapotrzebowaniem na te materiały. Poli(tereftalan etylenu) jest termoplastycznym polimerem wykorzystywanym do produkcji butelek do napojów, opakowań na żywność oraz włókien syntetycznych. Rozwój metod recyklingu chemicznego i mechanicznego PUR i PET pozwoli na ograniczenie ilości odpadów z tworzyw sztucznych powstających w znacznych ilościach każdego roku.
Reduction of road traffic noise by source measures — present and future strategies
- Truls Berge
- Piotr Mioduszewski
- Jerzy Ejsmont
- Beata Świeczko-Żurek
2017 Pełny tekst NOISE CONTROL ENGINEERING JOURNAL
The current trend worldwide is less focused on reducing road traffic noise. This is in strong contrast to the severe impact of traffic noise to the general health and quality of life. A more holistic and combined strategy is needed. Current international rules and regulations regarding vehicles and tyres are not sufficient to reduce traffic noise levels in an effective way. Calculations show that these regulations will only yield a reduction of approximately 1.5 dB in Lden levels for urban traffic. Additional measures need to be implemented. By combining optimized tyres and road surfaces, a noise reduction of 4–6 dB can be achieved. Such tyres are currently being developed for electric and hybrid-electric vehicles. In addition to noise reduction, these tyres have less rolling resistance that can reduce vehicle energy consumption up to 15% on normal road surfaces. However, there are several obstacles still to be removed, such as the effectiveness of the EU tyre labeling system, and the implementation and durability of low-noise road surfaces. These challenges are discussed in the article.
Redundancja jako sposób zwiększenia niezawodności siłowni okrętowych
- Wiesław Tarełko
2017 Przegląd Mechaniczny
Jednym z istotnych sposobów zapewnienia wysokiego poziomu niezawodności siłowni okrętowych jest zaprojektowanie redundancji jego elementów strukturalnych, np.: nadmiarowości strukturalnej systemów generowania energii, układów napędowych itp. W niniejszym artykule omówiono zagadnienia związane z nadmiarem, jako sposobem zwiększenia niezawodności systemów generowania energii i napędu statku. W szczególności zaś zostały zaprezentowane podstawowe cechy niezawodności, główne strategie oddziaływania na niezawodność oraz rodzaje nadmiarowości w odniesieniu do systemów generowania energii i napędu statku.