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Wyniki wyszukiwania dla: OPEN POROUS STRUCTURES
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Particle Shape Effect on Macroscopic Behaviour of Underground Structures: Numerical and Experimental Study
PublikacjaAbstract: The mechanical performance of underground flexible structures such as buried pipes or culverts made of plastics depend not only on the properties of the structure, but also on the material surrounding it. Flexible drains can deflect by 30% with the joints staying tight, or even invert. Large deformations of the structure are difficult to model in the framework of Finite Element Method, but straightforward in Discrete...
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Chitin and derivative chitosan-based structures — Preparation strategies aided by deep eutectic solvents: A review
PublikacjaThe high molecular weight of chitin, as a biopolymer, challenges its extraction due to its insolubility in the solvents. Also, chitosan, as the N-deacetylated form of chitin, can be employed as a primary material for different industries. The low mechanical stability and poor plasticity of chitosan films, as a result of incompatible interaction between chitosan and the used solvent, have limited its industrialization. Deep eutectic...
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Application of Shape Memory Alloys in Retrofitting of Masonry and Heritage Structures Based on Their Vulnerability Revealed in the Bam 2003 Earthquake
PublikacjaFor decades, one of the most critical considerations of civil engineers has been the construction of structures that can sufficiently resist earthquakes. However, in many parts of the globe, ancient and contemporary buildings were constructed without regard for engineering; thus, there is a rising necessity to adapt existing structures to avoid accidents and preserve historical artefacts. There are various techniques for retrofitting...
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Recent Advances in Performance-Driven Surrogate Modeling of High-Frequency Structures
PublikacjaDesign of high‐frequency structures, including microwave and antenna components, heavily relies on full‐wave electromagnetic (EM) simulation models. Their reliability comes at a price of a considerable computational cost. This may lead to practical issues whenever numerous EM analyses are to be executed, e.g., in the case of parametric optimization. The difficulties entailed by massive simulations may be mitigated by the use of...
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Analysis of server-side and client-side Web-GIS data processing methods on the example of JTS and JSTS using open data from OSM and geoportal
PublikacjaThe last decade has seen a rapid evolution of processing, analysis and visualization of freely available geographic data using Open Source Web-GIS. In the beginning, Web-based Geographic Information Systems employed a thick-client approach which required installation of platform-specific browser plugins. Later on, research focus shifted to platform-independent thin client solutions in which data processing and analysis was performed...
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High-Efficacy Global Optimization of Antenna Structures by Means of Simplex-Based Predictors
PublikacjaDesign of modern antenna systems has become highly dependent on computational tools, especially full-wave electromagnetic (EM) simulation models. EM analysis is capable of yielding accurate representation of antenna characteristics at the expense of considerable evaluation time. Consequently, execution of simulation-driven design procedures (optimization, statistical analysis, multi-criterial design) is severely hindered by the...
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The Revitalization Processes of the Port Structures in Gdynia and Gdansk on the Background of Contemporary Port Changes
PublikacjaTransformations of the port facilities against the modernization of the port structures are present in many city-port centers since more than 50 years. The modernization taking place in the ports located in Gdynia-Gdansk mainly concerns communication availability and adapted to the multimodal technology of transport and transshipment. Developing specialized tech-terminals serving a specific type of load, causes development of the...
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Open Geosciences
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Area specific resistance (at 800 °C - 500 °C) of the Sr0.86Ti0.65Fe0.35O3 porous oxygen electrodes sintered at different temperatures
Dane BadawczeIn this dataset are presented results of the polarization resistance of differently sintered Sr0.86Ti0.65Fe0.35O3 porous oxygen electrodes in symetrical cell. Applied sintering temperatures were 900 °C, 950 °C, 1000 °C and 1050 °C. The measurement temperature range was between 800 °C and 500 °C in stationary air. Results converted to electrode surfaces...
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Influence of pitting corrosion on fatigue and corrosion fatigue of ship structures. Part I: pitting corrosion of ship structures.
PublikacjaThe paper is a literature survey focused on pitting corrosion and its influence on fatigue of ship and offshore steels. Mechanisms of short- and long-term pitting corrosion in marine environment have been described including pit nucleation and growth phases. Some models of pit growth versus time of exposure have been presented. Some factors which influence the pit growth have been discussed briefly.
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Performance-driven yield optimization of high-frequency structures by kriging surrogates
PublikacjaUncertainty quantification is an important aspect of engineering design, as manufacturing toler-ances may affect the characteristics of the structure. Therefore, quantification of these effects is in-dispensable for adequate assessment of the design quality. Toward this end, statistical analysis is performed, for reliability reasons, using full-wave electromagnetic (EM) simulations. Still, the computational expenditures associated...
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Coordination polymers and molecular structures among complexes of mercury(II) halides with selected 1-benzoylthioureas
PublikacjaSix new 1-benzoyl-3-phenylthiourea and 1-benzoyl-3-(2-methylphenyl)thiourea complexes of mercury( II) were obtained in the reactions of the ligands with HgX2 in methanol (X = Cl, Br, I). Their structures, determined by single-crystal X-ray diffraction analysis, exhibit different stoichiometries and molecular organization. Coordination centers adopt more or less distorted tetrahedral geometry (five structures) or distorted trigonal...
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Mathematical Modelling of a Seismic Isolation System to Protect Structures During Damaging Earthquakes
PublikacjaThe present study aims to determine the effectiveness of a nonlinear mathematical model in simulating complex mechanical behaviour of a seismic isolation system to protect structures during strong and damaging earthquakes. In order to construct the Polymeric Bearings considered in this research, a specially prepared flexible polyurethane elastomer with increased damping properties has been used. The usefulness of the proposed mathematical...
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Value co‐creation (VCC) and value co‐destruction (VCD) via open government data (OGD): Empirical case of Tanzania
PublikacjaHaving emphasized upon the potential benefits of Open Government Data (OGD) initiatives via value derivation and innovation pursuits of the stakeholders, it falls in place to complement this line of OGD research in the specific case of Tanzania, a developing country, to support the inferences. Specifically, it is important to understand the manner in which OGD VCC-one of the hinges of OGD initiatives- and OGD VCD-a possible fall...
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Patryk Ziółkowski dr inż.
OsobyAbsolwent Wydziału Inżynierii Lądowej i Środowiska Politechniki Gdańskiej, w specjalności Konstrukcje Budowlane i Inżynierskie. Pracuje na stanowisku adiunkta w Katedrze Konstrukcji Inżynierskich. Brał udział w projektach międzynarodowych, w tym projektach dla Ministerstwa Transportu stanu Alabama (2015), jest także laureatem grantu Fundacji Kościuszkowskiej na prowadzanie badań w USA, który zrealizował w 2018 roku. Współautor...
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Accuracy improvement of the prestressed concrete structures precise geometry assessment by use of bubble micro-sampling algorithm
PublikacjaPrestressed concrete structures are well-known technology for a vast period, but nevertheless, this very technology is a leading solution, currently used in construction industry. Prestressed concrete structures have a huge advantage over conventional methods because it uses the properties of concrete in a very efficient way. The main idea behind this technology is to introduce into the cross-section of the structure, the internal...
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Effect of sintering temperature on electrochemical performance of porous SrTi1-xFexO3-δ (x = 0.35, 0.5, 0.7) oxygen electrodes for solid oxide cells
PublikacjaThis work evaluates the effects of the sintering temperature (800 °C, 900 °C, 1000 °C) of SrTi1-xFexO3-δ (x = 0.35, 0.5, 0.7) porous electrodes on their electrochemical performance as potential oxygen electrode materials of solid oxide cells. The materials were prepared by a solid-state reaction method and revealed the expected cubic perovskite structure. After milling, the powders were characterised by a sub-micrometre particle...
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IV Pomorska Konferencja Open Science
WydarzeniaKonferencja naukowa online, podczas której zostaną zaprezentowane doświadczenia polskich uczelni i instytutów naukowych w zakresie otwierania danych badawczych z różnych dyscyplin naukowych.
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EM-Driven Multi-Objective Optimization of Antenna Structures in Multi-Dimensional Design Spaces
PublikacjaFeasible multi-objective optimization of antenna structures is presented. An initial set of Pareto optimal solutions is found using a multi-objective evolutionary algorithm (MOEA) working with a fast surrogate antenna model obtained by kriging interpolation of coarse-discretization EM simulation data. To make the surrogate construction computationally feasible in multi-dimensional design space, the space subset containing non-dominated...
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Simplified Map-based Selection of Optimal Spindle Speeds When Milling Complex Structures
PublikacjaIn the paper a method for selecting optimal spindle speeds for complex structures during milling operations is presented. It is based on the selection of the spindle speed in accordance with a simple equation resulting from the minimisation of vibration energy, which leads to the minimisation of the work of cut-ting forces presented in previous elaborations by the authors [1]. Optimal spindle speeds are obtained for many points...
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A new time-frequency detection method of stray current field interferenceon metal structures.
PublikacjaA new detection method has been presented of stray current field interference on underground metal structures. The method employs short time Fourier transformation (STFT). This method of analysis allows determination of signal spectral power density changes (e.g., structure potential) in the function of time. In the paper results have been presented of total time–frequency analysis of a pipeline potential in a stray current field...
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Fragility analysis of structural pounding between adjacent structures arranged in series with various alignment configurations under near‑field earthquakes
PublikacjaA major cause of local to total damages is related to structural pounding in a large number of past earthquakes. In general, these collisions take place as a result of differences in the dynamic characteristics of the colliding structures. To acquire a better perception of the behavior of structures, in this paper, three structures featuring different heights are modeled in series and with various configurations next to each other...
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Sub-national structures matter when evaluating physical activity promotion: Lessons from Germany
PublikacjaBackground Public policies are increasingly acknowledged as important part of promoting physical activity (PA). However, especially in states with sub-national administrative structures such as Germany, national and sub-national approaches differ considerably. In Germany, sport for all (SfA) promotion is mostly organized at sub-national level, which is usually not covered in national evaluations. Knowledge of these structures helps...
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Fast multi-objective design optimization of microwave and antenna structures using data-driven surrogates and domain segmentation
PublikacjaPurpose Strategies and algorithms for expedited design optimization of microwave and antenna structures in multi-objective setup are investigated. Design/methodology/approach Formulation of the multi-objective design problem oriented towards execution of the population-based metaheuristic algorithm within the segmented search space is investigated. Described algorithmic framework exploit variable fidelity modeling, physics- and...
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Improved selectivity compact band-stop filter with gosper fractal-shaped defected ground structures
PublikacjaA novel band-stop filter using Gosper fractal-shaped defected ground structures has been designed and manufactured. The improvement in the filter selectivity has been achieved by introducing a multiresonance fractal-shaped defect leading to a higher filter order, simultaneously maintaining its compact size. The experimental results prove the validity of proposed solution and its utility in novel miniaturized and severe requirement...
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TEM, EDS and optical microscope images of pristine and silica-coated bismuth oxide (Bi2O3) and gadolinium oxide (Gd2O3) structures.
Dane BadawczeData consists of raw TEM/EDS and optical microscope images of pristine and silica-coated bismuth oxide (Bi2O3) and gadolinium oxide (Gd2O3) structures. Additional TEM images and optical microscope images of silica shells were included.
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Closer look into the structures of tetrabutylammonium bromide–glycerol-based deep eutectic solvents and their mixtures with water
PublikacjaIn recent years, deep eutectic solvents (DES) and it’s mixture with water have become more and more attention as green solvents used in chemistry. However, there are only a few theoretical studies on the mechanisms of pure DES and DES-water complex formation. Therefore, the structural properties of tetrabutylammonium bromide–glycerol-based deep eutectic solvents and their mixtures with water have been investigated by means of Molecular...
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Non-Linear Analysis of Structures Utilizing Load-Discretization of Stiffness Matrix Method with Coordinate Update
PublikacjaThis paper proposes a stiffness method based structural analysis algorithm for geometrically non-linear structures. In this study, the applied load on the joints has been discretized to a sequence of a few loadings applied. Each loading step produces incremental external nodal displacements, which are added to the corresponding coordinates to get a new geometrical shape of the structure. This process is iteratively repeated until...
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CO2 uptake capacities of PCMCA-900 (potassium citrate-derived porous carbon prepared at 900 °C) adsorbent at various temperatures
Dane BadawczeThese data contain CO2 uptake capacities of PCMCA-900 (potassium citrate-derived porous carbon prepared at 900 °C) adsorbent at various temperatures. Adsorption experiments were carried out at temperatures 0 °C, 25 °C, and 50 °C at 1 bar.
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Image-based numerical modeling of the tensile deformation behavior and mechanical properties of additive manufactured Ti–6Al–4V diamond lattice structures
PublikacjaThis work concerns the numerical modeling of the deformation process and mechanical properties of structures obtained by the additive method laser power bed fusion (LPBF). The investigation uses diamond structures of Ti–6Al–4V titanium implantation alloy with various relative densities. To model the process of tensile deformation of the materials, geometric models were used, mapping the realistic shape of the examined structures....
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Area specific resistance (at 800 °C - 500 °C) of the SrTi0.50Fe0.50O3 porous oxygen electrodes sintered at different temperatures
Dane BadawczeIn this dataset are presented results of the polarization resistance of differently sintered SrTi0.50Fe0.50O3 porous oxygen electrodes in symetrical cell. Applied sintering temperatures were 900 °C, 950 °C and 1000 °C. The measurement temperature range was between 800 °C and 500 °C with synthetic air flow (21% O2, 40 ml min-1). Results converted to...
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Area specific resistance (at 800 °C - 500 °C) of the SrTi0.30Fe0.70O3 porous oxygen electrodes sintered at different temperatures
Dane BadawczeIn this dataset are presented results of the polarization resistance of differently sintered SrTi0.30Fe0.70O3 porous oxygen electrodes in symetrical cell. Applied sintering temperatures were 900 °C, 950 °C and 1000 °C. The measurement temperature range was between 800 °C and 500 °C with synthetic air flow (21% O2, 40 ml min-1). Results converted to...
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Area specific resistance (at 800 °C - 500 °C) of the SrTi0.65Fe0.35O3 porous oxygen electrodes sintered at different temperatures
Dane BadawczeIn this dataset are presented results of the polarization resistance of differently sintered SrTi0.65Fe0.35O3 porous oxygen electrodes in symetrical cell. Applied sintering temperatures were 900 °C, 950 °C and 1000 °C. The measurement temperature range was between 800 °C and 500 °C with synthetic air flow (21% O2, 40 ml min-1). Results converted to...
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Influence of sintering temperature of porous SrTi0.30Fe0.70O3-d oxygen electrode on electrochemical impedance spectroscopy spectra measured at 800 °C
Dane BadawczeThis dataset contains results electrochemica impedance spectroscopy (EIS) of symmetrical cells with porous SrTi0.30Fe0.70O3-d oxygen electrodes sintered at different temperatures (800 °C; 900 °C and 1000 °C). Measure temperature was 800 °C (syntetic air, 40 ml min-1). Results converted to electrode surfaces area and dived by two electrodes.
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Influence of sintering temperature of porous SrTi0.50Fe0.50O3-d oxygen electrode on electrochemical impedance spectroscopy spectra measured at 800 °C
Dane BadawczeThis dataset contains results electrochemica impedance spectroscopy (EIS) of symmetrical cells with porous SrTi0.50Fe0.50O3-d oxygen electrodes sintered at different temperatures (800 °C; 900 °C and 1000 °C). Measure temperature was 800 °C (syntetic air, 40 ml min-1). Results converted to electrode surfaces area and dived by two electrodes.
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Influence of sintering temperature of porous SrTi0.65Fe0.35O3-d oxygen electrode on electrochemical impedance spectroscopy spectra measured at 800 °C
Dane BadawczeThis dataset contains results electrochemica impedance spectroscopy (EIS) of symmetrical cells with porous SrTi0.65Fe0.35O3-d oxygen electrodes sintered at different temperatures (800 °C; 900 °C and 1000 °C). Measure temperature was 800 °C (syntetic air, 40 ml min-1). Results converted to electrode surfaces area and dived by two electrodes.
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Economics-The Open Access Open-Assessment E-Journal
Czasopisma -
Experimental Study of the Influence of Small Upward Seepage on Open-Channel Flow Turbulence
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Static analysis of grids assembled with thin-walled beams of the open cross-section
PublikacjaPraca dotyczny analizy statycznej rusztów zbudowanych z prętów cienkościennych. Przedstawiono w niej koncepcję metody modelowania konstrukcji dźwigarów cienkościennych i rusztów z wykorzystaniem superelementów w połączeniu z klasyczną teorią belek cienkościennych o przekroju nieodkształcalnym. Zamieszczono wyniki przeprowadzonej eksperymentalnej weryfikacji badań teoretycznych.
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Open-transistor fault diagnostics in voltage-source inverters by analyzing the load current
PublikacjaPrzedstawiono nową metodę detekcji i lokalizacji uszkodzeń polegających na braku przewodzenia tranzystorów w falownikach napięcia zasilających silniki indukcyjne. Metoda jest rozszerzeniem, opracowanej wcześniej, metody wykorzystującej znormalizowane składowe stałe prądów obciążenia. Znormalizowane wartości średnie prądów powiązano z dodatkowymi wskaźnikami diagnostycznymi, które zawierają informacje o czasie trwania nieprzewodzenia...
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Effective mode volume of a natural mode of an open dielectric resonator with an active region
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Selected problems of stability of thin-walled columns with bisymmetric open cross-section
PublikacjaPraca dotyczy problemów stateczności osiowo ściskanych prętów o bisymetrycznym przekroju otwartym. Badano wpływ nieliniowości materiału pręta oraz wstępnego zakrzywienia osi na wyboczenie skrętne oraz początkową ścieżkę pokrytyczną. Na przykładach numerycznych wykazano, że w pewnych przypadkach stateczny, symetryczny punkt może zmienić się na symetryczny ale niestateczny, co oznacza możliwość redukcji siły krytycznej.
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Cost-Effectiveness of Open Repair of Abdominal Aortic Aneurysms with a Novel Perioperative Protocol
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Dobre praktyki i narzędzia open source w zwinnym wytwarzaniu oprogramowania
PublikacjaZwinne wytwarzanie oprogramowania stało się bardzo popularne. Na podstawie projektu MOST Wiedzy przedstawiono procesy i narzędzia wspierające wytwarzanie oprogramowania na Politechnice Gdańskiej. Metodologia DDD (domain-driven design) wspierana przez repozytorium GIT oraz tzw. proces “cherry picking” powoduje, że proces wytwarzania oprogramowania jest elastyczny i efektywny. Dodatkowo wprowadzenie elementów CI (continuous integration),...
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Baza polityk wydawniczych i repozytorium Open Access – uzupełniające się elementy
PublikacjaPrzedstawiono korzyści płynące z tworzenia i wykorzystywania bazy polityk wydawniczych polskich czasopism naukowych dla różnych interesariuszy, takich jak wydawcy, redaktorzy, naukowcy i bibliotekarze. Omówiono podstawowe zadania i funkcje bazy, tak aby ukazać ją jako kompleksowe źródło informacji o polityce wydawniczej polskich czasopism. Gromadzone w bazie informacje stanowią istotną pomoc w ustalaniu zasad samoarchiwizacji publikacji...
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Implementation of didactic simulation models in Open Source and SCORM compliant LMS systems.
PublikacjaModele symulacyjne są cenną pomocą w procesie dydaktycznym. Ich zastosowanie w systemach komputerowego wspomagania nauczania znacząco podnosi ich efektywność oraz pozwala na przeprowadzanie wirtualnych ćwiczeń laboratoryjnych (na przykład podczas nauczania na odległość). Niestety stosowane obecnie systemy LMS (Lerning Management System) nie są zadowalająco przystosowane do obsługi symulacyjnej zawartości dydaktycznej. W artykule...
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Open source solution LMS for supporting e-learning/blended learning engineers
PublikacjaW artykule zaprezentowano darmowe systemy zarządzania kształceniem na odległość wspomagające e-learningowe/mieszane nauczanie inżynierów. Pierwszy system TeleCAD został opracowany w ramach projektu Leonardo da Vinci (1998-2001). System TeleCAD był propozycją w projekcie V Ramowy CURE (2003-2006). W roku 2003 dzięki projektowi Leonardo da Vinci EMDEL (2001-2005) Centrum Edukacji Niestacjonarnej Politechniki Gdańskiej wybrało system...
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On Improved-Reliability Design Optimization of High-Frequency Structures Using Local Search Algorithms
PublikacjaThe role of numerical optimization has been continuously growing in the design of high-frequency structures, including microwave and antenna components. At the same time, accurate evaluation of electrical characteristics necessitates full-wave electromagnetic (EM) analysis, which is CPU intensive, especially for complex systems. As rigorous optimization routines involve repetitive EM simulations, the associated cost may be significant....
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Investigating the Effects of Geometrical Parameters of Re-Entrant Cells of Aluminum 7075-T651 Auxetic Structures on Fatigue Life
PublikacjaIn this study, the effects of two geometrical parameters of the re-entrant auxetic cells, namely, internal cell angle (θ) and H/L ratio in which H is the cell height, and L is the cell length, have been studied on the variations of Poisson’s ratio and fatigue life of Aluminum 7075-T6 auxetic structures. Five different values of both the H/L ratio and angle θ were selected. Numerical simulations and fatigue life predictions have...
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Shaking table experimental study on the effectiveness of polymer bearings for seismic isolation of structures
PublikacjaSeismic isolation has been recognised to be a very effective way of protecting structures from damage during earthquakes. It allows us to extend the natural period of the structure and therefore avoid resonance with the ground motion. Moreover, by increasing damping in the isolation devices, more energy can be dissipated and thus the structural response can be further reduced. The aim of this paper is to show the results of the...