2017 - Repozytorium publikacji - Politechnika Gdańska

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Strategia rozwoju transportu w obszarze metropolitalnym
- Kazimierz Jamroz
- Romanika Okraszewska
- Krystian Birr
- Lech Michalski
- Krzysztof Grzelec
- Sławomir Grulkowski
2017
Dokument strategii rozwoju transportu metropolitalnego jest narzędziem wyrażającym wspólne podejście samorządów i podmiotów działających na obszarze metropolii do rozwiązywania problemów transportowych i przewodnikiem służącym do osiągnięcia wyznaczonych celów. W niniejszym referacie przedstawiono podstawowe cele i założenia oraz metodykę analiz zastosowaną na potrzeby opracowania Strategii Transportu i Mobilności Obszaru Metropolitalnego Gdańsk-Gdynia-Sopot, składającej się z czterech podstawowych części: diagnozy funkcjonującego systemu transportowego, analizy scenariuszy i wariantów jego rozwoju, opisu programów i właściwej strategii.
Strategia wektorowej modulacji szerokości impulsów dla wielofazowych falowników napięcia
- Arkadiusz Lewicki
- Patrick Strankowski
- Marcin Morawiec
- Jarosław Guziński
2017
W artykule zaproponowano strategię wektorowej modulacji szerokości impulsów dla wielofazowych falowników napięcia. Zaproponowane rozwiązanie pozwala na niezależne formowanie napięć wyjściowych w n-fazowym falowniku dwupoziomowym z wykorzystaniem (n-1) wektorów aktywnych. Przedstawiony algorytm modulacji umożliwia dobór sekwencji wektorów aktywnych i pasywnych wymagającej minimalnej liczby przełączeń tranzystorów falownika. W artykule przedstawiono wyniki badań napędu elektrycznego z silnikiem klatkowym zasilanym z pięciofazowego falownika napięcia, w którym zaimplementowano zaproponowane rozwiązanie.
Strategiczne zagadnienia tworzenia i funkcjonowania sieci tymczasowych
- Katarzyna Tubielewicz
2017 Pełny tekst Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
W artykule przedstawiano wyniki badań zagadnień charakteryzujących tworzenie i funkcjonowanie sieci tymczasowych, tj. sieci, które są organizowane w celu realizacji dużych, złożonych przedsięwzięć gospodarczych, najczęściej kosztownych i przekraczających możliwości realizacyjne jednego przedsiębiorstwa i które są powołane na określony okres czasu. Skupiono się nad strategicznymi zagadnieniami tworzenia i funkcjonowania tych sieci, które mają wpływ na wyniki funkcjonowania sieci, a w konsekwencji na sukces lub porażkę przedsięwzięcia. W opracowaniu przedstawiono charakterystykę sieci tymczasowej jako pewnej kategorii organizacji sieciowych. Celem artykułu jest dokonanie diagnozy w oparciu o analizę literatury i wywiady strategicznych zagadnień tworzenia sieci tymczasowej od strony organizacyjnej i formalnej oraz zasad współpracy w ramach sieci.
Strategie rozwoju obszarów funkcjonalnych miast na obszarach peryferyjnych polskich regionów
- Jacek Sołtys
2017
Artykuł dotyczy strategii 12 miejskich obszarów funkcjonalnych (MOF) na polskich ob-szarach peryferyjnych, tj. zlokalizowanych poza MOF stolic województw. Celami badania były: (1) znalezienie czynników, które były podstawą do opracowania planowanych strategii, (2) rozpoznanie i ocena strategii (3) wzbogacenie wiedzy na temat planowania strategicznego: stosowanych metod, a także najbardziej powszechnych wad. Metoda badań obejmowała ana-lizę planów strategicznych. Plany te niewystarczająco podkreślają specyfikę obszarów. Roz-wój MOF może przyczynić się do rozwoju części obszarów peryferyjnych.
Strategies for achieving energy neutrality in biological nutrient removal systems - a case study of the Slupsk WWTP (northern Poland)
- Ewa Zaborowska
- Krzysztof Czerwionka
- Jacek Mąkinia
2017 Pełny tekst WATER SCIENCE AND TECHNOLOGY
The paper presents a model-based evaluation of technological upgrades on the energy and cost balance in a large biological nutrient removal wastewater treatment plant (WWTP) in the city of Slupsk (northern Poland). The proposed upgrades include chemically enhanced primary sludge removal and reduction of the nitrogen load in the deammonification process employed for reject water treatment. Simulations enabled to estimate the increased biogas generation and decreased energy consumption for aeration. The proposed upgrades may lead the studied WWTP from the energy deficit to energy neutrality and positive cost balance, while still maintaining the required effluent standards for nitrogen. The operating cost balance depends on the type of applied coagulants/ flocculants and specific costs of electric energy. The choice of the coagulant/ flocculant was found as the main factor determining a positive cost balance.
Strength analysis of a large-size supporting structure for an offshore wind turbine
- Karol Niklas
2017 Pełny tekst Polish Maritime Research
The offshore wind power industry is the branch of electric energy production from renewable sources which is most intensively developed in EU countries. At present, there is a tendency to install larger-power wind turbines at larger distances from the seashore, on relatively deep waters. Consequently, technological solutions for new supporting structures intended for deeper water regions are undergoing rapid development now. Various design types are proposed and analysed, starting from gravitational supports (GBS), through monopiles and 3D frame structures (jackets, tripods), and ending with floating and submerged supports anchored to the seabed by flexible connectors, including TLP type solutions. The article presents the results of examination of an untypical large-size gravitational support intended for waters with the depth of up to 40 m. Firstly, a general concept of the new design is presented, while the next basic part of the article describes the support design in detail and provides its strength analysis. The examined support has the form of a large steel container consisting of conical segments. The strength analysis was conducted using the finite element method (FEM), in accordance with the standard DNVGL-ST-0126. Modifications introduced to the most heavily loaded structural node of the support, which was the set of base bottom trusses, is also included. The results of the performed analysis prove that the presented concept of supporting structure for a 7MW turbine meets fundamental strength criteria. The nonlinear buckling analysis was performed to evaluate the critical force acting on the support, which turned out to be 1.44 times as large as the maximum load of the wind turbine. Potentially important issues for further analyses have been identified as those resulting from the asymmetry of basic loads acting on the support.
Structural and luminescence investigation of GeO2-PbO-Bi2O3-SrF2 glasses doped with Eu3+, Tb3+ and Tm3+ ions
- Barbara Kościelska
- Michalina Walas
- Tomasz Lewandowski
- Marcin Stanisław Łapiński
- Marcin Dębowski
- Anna Synak
- Andrzej Kłonkowski
- Wojciech Sadowski
- Irena Bylińska
- Wiesław Wiczk
2017 JOURNAL OF NON-CRYSTALLINE SOLIDS
The GeO2-PbO-Bi2O3-SrF2 (GePbBiSr) glass systems doped with Eu3 +, Tb3 +, Tm3 + and triply-doped with Eu3 +/Tb3 +/Tm3 + ions were successfully synthesized. Their structural and luminescent properties have been investigated with various techniques. Obtained results indicate that these glass systems are suitable materials for the RE3 + ions hosts. RE3 + ions can be excited by single UV light wavelength (355/378/395 nm) and simultaneously emit red, green and blue light originating from Eu3 +, Tb3 + and Tm3 + transitions. Emission color changes from bluish-purple for 355 nm excitation to white when irradiated with 378 nm and 395 nm. The GePbBiSr glass triply-doped by Eu3 +/Tb3 +/Tm3 + ions could be a potential candidate for white LED applications.
Structural and spectroscopic investigation of new luminescent hybrid materials based on calix[4]arene-tetracarboxylate and Ln 3+ ions (Ln = Gd, Tb or Eu)
- Rodrigo da_Silva_Viana
- Carlos Alberto Fernandes de Oliveira
- Jarosław Chojnacki
- Bráulio Barros
- Severino Alves Junior
- Joanna Kulesza
2017 Pełny tekst JOURNAL OF SOLID STATE CHEMISTRY
Lanthanide-calixarene hybrid materials are of particular interest due to the combination of the interesting properties of the ligand cavity-like structure and the luminescent features of lanthanides. The aim of this study was to synthesize and investigate the photophysical properties of Eu3+, Tb3+ and Gd3+ hybrids based on calix[4]arene-tetracarboxylate. The preparation of two structurally different Tb3+ compounds (calix-TA-SC-Tb and calix-TA-Tb) was dictated by the ligand to metal molar ratio and the synthesis time. Analysis of calix-TA-SC-Tb monocrystals revealed the formation of a mononuclear complex of C2 symmetry containing Tb3+ coordinated by four calixarene ionized groups and formate anion encapsulated within the upper cavity. Syntheses of other hybrids failed in producing high-quality crystals and the structures could not be solved. The solid-state luminescent properties of hybrids were evaluated, and the structure/property relationship was investigated. Based on the emission and excitation spectra, the energy diagrams for calix-TA-Eu, calix-TA-Tb and calix-TAGd were proposed.
Structural Health Monitoring System for Suspension Footbridge
- Mikołaj Miśkiewicz
- Łukasz Pyrzowski
- Krzysztof Wilde
2017
The article presents the structural health monitoring (SHM) system installed in a footbridge in Radom. The main reason for the need for fitting of such a system was failed acceptance tests of the bridge. While under a dynamic load consisting of a group of 12 pedestrians jumping on the bridge, the bridge developed vibration during which acceleration of the deck of up to 4.5 m/s2 was recorded. Such behavior of the footbridge causes unacceptable discomfort to the users and risks damage to the footbridge. A remedial design is currently in development for the structure, based on the use of tuned mass dampers (TMD). Utilizing a monitoring system will increase the operational safety of the structure, will provide data on the structure's behavior during use and will provide current information about its general technical condition.
Structural optimization of microjet array cooling system
- Tomasz Muszyński
- Dariusz Mikielewicz
2017 Pełny tekst APPLIED THERMAL ENGINEERING
The single phase heat transfer from an upward facing, horizontal copper surface to arrays of impinging water jets was experimentally investigated. Experimental configuration allows for a free-surface unconfined jets flow. Square nozzles 50 × 100 μm arranged in four different geometries were used. Additionally, for the set of two jets array geometry was varied by adjusting the nozzle to nozzle distance. The area averaged heat transfer coefficient was found to be a strong function of working fluid mass flux and array geometrical aspect ratio. The proposed correlation agreed with the experimental data within 30% error bounds Obtained database of experimental data with analytical correlation allows the rational design of microjet modules for various industrial applications.
Structural, spectral and magnetic properties of Ni(II), Co(II) and Cd(II) compounds with imidazole derivatives and silanethiolate ligands
- Daria Kowalkowska-Zedler
- Anna Dołęga
- Natalia Nedelko
- Zbigniew Hnatejko
- Łukasz Ponikiewski
- Alicja Matracka
- Anna Ślawska-waniewska
- Alicja Strągowska
- Klaudia Słowy
- Maria Gazda
- Agnieszka Pladzyk
2017 Pełny tekst CRYSTENGCOMM
A series of new metal heteroleptic complexes have been obtained in simple reactions of 1-(3-aminopropyl)-imidazole (api) and 1,4-bis(imidazol-1-yl)-butane (bbi) ligands with metal silanethiolates or acetylacetonates. The obtained complexes are the coordination polymers [Ni{SSi(tBuO)3}2(μ-api)]n1, [Co{SSi(tBuO)3}2(μ-api)]n2, [Cd{SSi(tBuO)3}2(μ-api)·2CH3OH]n3, [Cd{SSi(tBuO)3}2(μ-bbi)·CHCl3]n4 and the dimer [Co{SSi(tBuO)3}2(μ-bbi)·3CH3OH]25. Another coordination polymer with the formula [Ni(acac)2(μ-bbi)·9CHCl3]n6 was obtained in the reaction of Ni(acac)2 with (tBuO)3SiSH (TBST) and bbi; however, the silanethiolate residue didn't coordinate to the metallic center as intended. The molecular structures of 1–6 were determined by single-crystal X-ray diffraction. Compounds 1–5 were additionally characterized by thermogravimetry (TGA) and powder X-ray diffraction. The emission spectra of the Cd complexes 3 and 4 were recorded in the solid state at ambient temperature, whereas 1, 2 and 5 were subjected to magnetic studies. Variable-temperature magnetic measurements of the polycrystalline sample 1 suggest the presence of weak intra-chain magnetic interactions between the nickel(II) ions. Magnetic studies of 2 and 5 show their paramagnetic behavior. For sample 1 as well as samples 2 and 5, a noticeable influence of single-ion magnetic anisotropy on their magnetic behavior has been revealed.
Structural, thermal and physico-mechanical properties of polyurethane/brewers’ spent grain composite foams modified with ground tire rubber
- Krzysztof Formela
- Aleksander Hejna
- Łukasz Zedler
- Marta Przybysz-Romatowska
- Jacek Ryl
- Mohammad Saeb
- Łukasz Piszczyk
2017 INDUSTRIAL CROPS AND PRODUCTS
In this work, brewers’ spent grain (BSG) and ground tire rubber (GTR) waste fillers were applied as low-cost reinforcement phase in rigid polyurethane foam (PUR). PUR/BSG/GTR composites were prepared by a single step method, using polyglycerol as partial substitute of commercially available petrochemical polyols. Foaming parameters, chemical structure, dynamic mechanical properties, thermal stability, physico-mechanical properties and morphology of obtained composites were evaluated as function of BSG/GTR ratio (in range: 20/0; 15/5; 10/10; 5/15; 0/20 parts by weight – pbw). Modification of PUR/BSG composite foams with GTR accelerated foaming reactions, which resulted in decrease of rise time and tack free time. Higher content of GTR in PUR/BSG/GTR composites significantly enhanced their physico-mechanical properties and thermal stability. Compressive strength of PUR modified with BSG/GTR in ratio 5/15 pbw was more than 50% higher than for PUR/BSG composite foam without GTR, which correspond to 37% increase of density. Additionally, it was observed that temperatures corresponded to a 2% and 5% weight loss were for 9 °C and 24 °C higher for composite with BSG/GTR hybrid filler than for pure polyurethane matrix. Presented results indicate better compatibility between polyurethane matrix and GTR than with BSG, confirmed also by ATR-FTIR, DMA, swelling behavior and SEM analysis. Conducted investigations showed that performance properties of polyurethane/brewers’ spent grain composite foams could be successfully tailored using GTR, which consequently extend their potential industrial applications.
Structure analysis and thermal degradation characteristics of bio-based poly(propylene succinate)s obtained by using different catalyst amounts
- Paulina Parcheta
- Janusz Datta
2017 Pełny tekst JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Linear bio-based polyester polyols were prepared with the use of succinic acid and 1.3-propanediol (both with natural origin). As a catalyst was used tetraisopropyl orthotitanate (TPT). In order to determine the effect of various catalyst content on the thermal degradation characteristics, three different TPT amounts, as a 1.3-propanediol equivalent, were used, namely 0.1 mass% (PPS-0.1), 0.2 mass% (PPS-0.2) and 0.25 mass% (PPS-0.25). The reference polyol was prepared without catalyst employment (PPS-0.0). Fourier transform infrared spectroscopy was used to confirm molecular structure of the resulted polyols. The structure was also corroborated by 1H NMR measurements, what confirmed nonsignificant catalyst amount impact on the structure of the prepared polyester polyols. Differential scanning calorimetry was carried out for glass transition temperature and melting point determination. The thermogravimetric analysis allowed to observe high thermal stability both under inert and oxidative atmosphere. This analysis affirmed also that the catalyst content did not influence significantly on the thermal degradation characteristics of the prepared polyols.
Structure and electrical properties of Y, Fe-based perovskite mixed conducting composites fabricated by a modified polymer precursor method
- Tadeusz Miruszewski
- Paweł Gdaniec
- Wojciech Rosiński
- Jakub Karczewski
- Beata Bochentyn
- Bogusław Kusz
2017 SOLID STATE SCIENCES
In this work, samples of Y0.07Sr0.93Ti1-xFexO3-d with 20, 40, 60 and 80 mol% of iron amount were prepared by a low-temperature polymer precursor method. The SEM-EDS analysis proved that analyzed Y0.07Sr0.93Ti1-xFexO3-d samples were composites of two Ti- and Fe-rich perovskite samples. This kind of composite consists of two phases in which one has a good ionic and the other electronic conductivity, which makes such a composite a potential mixed ionic and electronic conductors (MIECs) material. The total electrical conductivities of analyzed samples were measured in air atmosphere (cathode conditions in Solid Oxide Fuel Cell). The values changed from ~103 to 101 S cm1 and depended on the ratio between two observed perovskite phases. The 0.12 S cm1 conductivity value at 800 C for sample with the highest amount of Fe-rich perovskite in the structure makes this composite material a candidate for air electrode in electrochemical devices.
Structure and thermoelectric properties of Cs-Bi-Te alloys fabricated by different routes of reduction of oxide reagents
- Natalia Gostkowska
- Tadeusz Miruszewski
- Bartosz Jakub Trawiński
- Beata Bochentyn
- Bogusław Kusz
2017 Pełny tekst SOLID STATE SCIENCES
Cesium-bismuth-telluride polycrystalline materials were fabricated using a cost-effective method based on a reduction of oxide reagents, leading to a production of a material with good thermoelectric properties. Several samples with various initial stoichiometry were prepared by melting of oxide powders at 1050 °C, quenching, milling to powders and then reducing in pure hydrogen at 400 °C. Another concept was to obtain the CsBi4Te6 material without a melting stage. Composition of the samples was analyzed by the XRD and EDX methods. The sample with 96% of CsBi4Te6 phase was obtained in a way of reduction of oxide reagents. Thermoelectric properties of fabricated samples were also investigated.
Structure of the Resource Theory of Quantum Coherence
- Alexander Streltsov
- Swapan Rana
- Paul Boes
- Ralf Eisert
2017 PHYSICAL REVIEW LETTERS
Quantum coherence is an essential feature of quantum mechanics which is responsible for the departure between the classical and quantum world. The recently established resource theory of quantum coherence studies possible quantum technological applications of quantum coherence, and limitations that arise if one is lacking the ability to establish superpositions. An important open problem in this context is a simple characterization for incoherent operations, constituted by all possible transformations allowed within the resource theory of coherence. In this Letter, we contribute to such a characterization by proving several upper bounds on the maximum number of incoherent Kraus operators in a general incoherent operation. For a single qubit, we show that the number of incoherent Kraus operators is not more than 5, and it remains an open question if this number can be reduced to 4. The presented results are also relevant for quantum thermodynamics, as we demonstrate by introducing the class of Gibbs-preserving strictly incoherent operations, and solving the corresponding mixed-state conversion problem for a single qubit..
Structure of the US investment company industry over the period 2000 to 2017: substitution analysis
- Adam Marszk
2017 Zarządzanie i Finanse
Over the last years the investment company industry has undergone deep transformation in the majority of the most advanced economies, including the United States. Traditional investment companies, such as mutual funds, have lost their market share to innovative exchange-traded funds (ETFs). The main distinctive features of ETFs are listing and trading in their units on the stock exchanges as well as lower costs for investors. The aim of this paper is to present the in-depth insights into the changes in the structure of the US investment company industry and to determine whether the mutual funds have lost their market share due to the growth of ETFs; supplementary aim is the prediction of future changes. In the major In the major part of the empirical research logistic substitution model is applied, modified to conduct the analysis of changes on the financial markets. Key parameters of the logistic curve are estimated, showing the rate of the substitution. It is the first study to empirically verify the occurrence and intensity of substitution between mutual funds and ETFs in the US investment company industry with the detailed analysis for various groups of funds (classified according to their exposure). Results of the analysis prove that between 2000 and 2017 ETFs have increased their market share and this trend is expected to continue in the future. ETFs linked with the equity markets have won higher market share than ETFs based on bonds. International equity ETFs are projected to win the highest market share among all categories considered. (original abstract)
Structure, Physicochemical and Biological Properties of an Aqua (2,2′,2′′-Nitrilotriacetato)-oxidovanadium(IV) Salt with 4-Methylpyridinium Cation
- Aleksandra Tesmar
- Dariusz Wyrzykowski
- Katarzyna Kazimierczuk
- Julia Kłak
- Kowalski Szymon
- Iwona Inkielewicz-Stępniak
- Joanna Drzeżdżon
- Dagmara Jacewicz
- Lech Chmurzyński
2017 ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
The crystal structure of a nitrilotriacetate (nta) oxidovanadi-um(IV) salt with 4-methylpyridinium cation, [4-Me(Py)H]+, of [4-Me(Py)H][VO(nta)(H2O)] stoichiometry was determined. The com-plex comprises a discrete mononuclear [VO(nta)(H2O)]–coordinationentity that can be rarely found among other known compounds con-taining nitrilotriacetate oxidovanadium(IV) moieties. The complex wascharacterized by spectroscopic (IR and EPR) methods, magnetic mea-surements, and thermogravimetry (TG-FTIR). The stability of the titlecompound in aqueous solutions was investigated by using the potentio-metric titration method. Furthermore, spectrophotometric (UV/Vis)studies have revealed that the compound is capable to scavenge the superoxide free radicals (O2•–) as well as stable organic radicals i.e.2,2⬘-azinobis(3-ethylbenzothiazoline-6 sulfonic acid) cation radical(ABTS+•) and 2,2-diphenyl-1-picrylhydrazyl radical (DPPH•). Finally,biological properties of the complex studied were investigated in rela-tion to its cytoprotective activity against the oxidative damage gener-ated exogenously by using hydrogen peroxide in the HT22 hippocam-pal neuronal cell line (the MTT assay). Additionally, the biologicalaction of the compound towards two human osteosarcoma HOS andMG-63 cell lines (the MTT and BrdU tests) as well as the untrans-formed human osteoblast hFOB 1.19 cell line was tested.
Structures of diamond tool composites
- Andrzej Bakoń
- Adam Barylski
2017 Pełny tekst Mechanik
Presented are structures and examples of applications of diamond tool composites. They are widely used as cutting tools, bonded abrasive tools and dressing tools.
STRUKTURA ORAZ WŁAŚCIWOŚCI ELEKTRYCZNE MATERIAŁÓW SZKLISTYCH ZAWIERAJĄCYCH GRANULE FERROELEKTRYKA Bi2VO5,5
- Natalia Anna Wójcik
2017 Pełny tekst
Nanokompozyty – ceramiki ferroelektrycznej umieszczonej w matrycy szklanej, dzięki swoim interesującym właściwościom znajdują zastosowanie w wielu urządzeniach i elementach elektronicznych. Jednym z ciekawych ferroelektryków jest ceramika Bi2VO5,5, która wykazuje wysokie przewodnictwo jonowe i przenikalność dielektryczną oraz nieliniowe właściwości optyczne. Przykładem szkła, o strukturze umożliwiającej rozmieszczenie wewnątrz nanokryształów ferroelektryka jest szkło boranowo-strontowe, charakteryzujące się niską temperaturą topnienia. Najbardziej popularną metodą wytwarzania takich materiałów jest wytop szkła, a następnie jego częściowa krystalizacja. Struktura i właściwości dielektryczne takich szkło-ceramik powinny mocno zależeć od zawartości ceramiki, metody wytwarzania oraz parametrów procesu krystalizacji. Przedmiotem niniejszej rozprawy doktorskiej są materiały kompozytowe: szkła boranowo-strontowe zawierające rozproszone granule Bi2VO5,5.