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Search results for: anticorrosion coating
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Mechanical Properties of Different Nanopatterned TiO2 Substrates and Their Effect on Hydrothermally Synthesized Bioactive Hydroxyapatite Coatings
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Water absorption and blistering of glass fibre-reinforced polymer marine laminates with nanoparticle-modified coatings
PublicationMacro and microstructural damage was studied in typical glass fibre-reinforced polymer laminates with two types of coating systems – (a) isophtalic gel coat: pure or mixed with SiO2 nanoparticles 5 wt% (5%N) or 10 wt% (10%N) and (b) a two-layer coating system: urethane-modified vinyl ester-based gel coat and additional polyester barrier coat layer. Accelerated tests were performed at 50C for 50 days for specimens with nanoparticle-modified...
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The Chemical and Biological Properties of Nanohydroxyapatite Coatings with Antibacterial Nanometals, Obtained in the Electrophoretic Process on the Ti13Zr13Nb Alloy
PublicationThe risk of an early inflammation after implantation surgery of titanium implants has caused the development of different antimicrobial measures. The present research is aimed at characterizing the effects of nanosilver and nanocopper dispersed in the nanohydroxyapatite coatings, deposited on the Ti13Zr13Nb alloy, and on the chemical and biological properties of the coatings.The one-stage deposition process was performed by the...
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Protective and Suppressing Electromagnetic Interference Properties of Epoxy Coatings Containing Nano-Sized NiZn Ferrites
PublicationNano-crystalline ferrites with the chemical formula NixZn(1−x)Fe2O4, where x = 0, 0.2, 0.4, 0.6, 0.8, 1.0, were synthesized using a co-precipitation method. The obtained ferrites were investigated by X-ray diffraction (XRD). The corrosion inhibiting behavior of nano-sized ferrites was tested using carbon steel samples and 10% aqueous ferrite extracts. Results were compared with previous data obtained for micro-sized ceramic ferrites....
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Structure and superconductivity of VN-SiO2 films obtained by thermal nitridation of sol-gel derived coatings
PublicationPraca prezentuje wyniki badań strukturalnych oraz właściwości nadprzewodzących cienkich warstw xVN-(100-x)SiO2, gdzie x = 90, 80, 70, 60 mol%. Warstwy zostały wykonane metodą termicznego azotowania z użyciem amoniaku cienkich warstw tlenkowych otrzymanych metodą zol-żel. Badania struktury przeprowadzono metodami XRD oraz XPS, natomiast właściwości nadprzewodzące badano metodą MMMA. Właściwości nadprzewodzące warstw zależą zarówno...
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An attempt to mechanistically explain the viscoelastic behavior of transparent epoxy/starch-modified ZnO nanocomposite coatings
PublicationThe effects of bare and starch-modified ZnO (ZnO-St) nanoparticles on viscoelastic and mechanical properties are studied by dynamic mechanical and tensile analyses. Transparent epoxy-based nanocomposite films are prepared by incorporating bare or starch-modified ZnO particles into the epoxy matrix. The results demonstrated that ZnO particles hindered the curing reactions and hence the final properties of the cured epoxy. As a result,...
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Analysis of compressive forces in CFGFT cylindrical pillars and their coatings using laboratory tests and metric spaces
PublicationThe article discusses compressive forces tests in composite-concrete pillars with the use of laboratory active experiment including the factors and properties of materials which have a significant impact on the test results and their repeatability. A polymer composite based on glass fiber reinforced resin with different fiber beam angles (20, 55 and 85) was used as a buffer/coat of the pole. Due to the problems with direct comparison...
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The Morphology, Structure, Mechanical Properties and Biocompatibility of Nanotubular Titania Coatings before and after Autoclaving Process
PublicationThe autoclaving process is one of the sterilization procedures of implantable devices. Therefore, it is important to assess the impact of hot steam at high pressure on the morphology, structure, and properties of implants modified by nanocomposite coatings. In our works, we focused on studies on amorphous titania nanotubes produced by titanium alloy (Ti6Al4V) electrochemical oxidation in the potential range 5–60 V. Half of the...
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Development of SPME fiber coatings with tunable porosity for physical confinement of ionic liquids as an extraction media
PublicationExtending the use of ionic liquids in sample preparation techniques remains a challenge. This paper presents procedures enabling the easy application of ionic liquids to the SPME technique. For this purpose, two approaches for producing a porous silica coating on a metal rod were investigated. Two silica precursor and porogen systems were used in the research: K2SiO3 + Formamide and Tetramethyl-orthosilicate + Polyethylene oxide....
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Influence of CeO2 and TiO2 Particles on Physicochemical Properties of Composite Nickel Coatings Electrodeposited at Ambient Temperature
PublicationThe Ni-TiO2 and Ni-CeO2 composite coatings with varying hydrophilic/hydrophobic characteristics were fabricated by the electrodeposition method from a tartrate electrolyte at ambient temperature. To meet the requirements of tight regulation by the European Chemicals Agency classifying H3BO3 as a substance of very high concern, Rochelle salt was utilized as a buffer solution instead. The novelty of this study was to implement a...
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Effect of plasma sprayed and laser re-melted Al2O3 coatings on hardness and wear properties of stainless steel
PublicationCommercially available austenic stainless steel substrate was coated with commercially available, raw Al2O3 powder applied by means of plasma spraying method and then re-melted with CO2 laser beam of various parameters. Tribological and mechanical properties of the 120 J/mm and 160 J/mm laser re-melted coatings were compared with the tribological and mechanical properties of the “as-sprayed” coating. The influence of the laser...
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Deterioration and Protection of Concrete Elements Embedded in Contaminated Soil: A Review
PublicationCoating materials are considered one of the most antique materials of human civilization; they have been used for decoration and the protection of surfaces for millennia. Concrete structures—due to their permanent exposure to different types of environments and contaminants—require the use of coatings that contribute to its preservation by reducing the corrosion of its components (steel and aggregates). This article intends to...
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Effect of microwave and convection heating on selected nutrients of human milk
PublicationThe aim of this study was to determine the influence of the microwave heating method (MWH) on selected determinants of the nutritional value of human milk (HM) and compare to the effect exerted by the standard convection heating (CH) method, including holder pasteurization (HoP). It was showed that using MWH under conditions assumed to ensure microbiological safety, changes in the level of the nutrients were not observed. In these...
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A Method and Device for 3D Recognition of Cutting Edge Micro Geometry
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The original method of cutting power forecasting while wood sawing
PublicationEfekty energetyczne procesu przecinania drewna piłami (siły skrawania i moc skrawania) przy klasycznym podejściu do zagadnienia są określane na podstawie wartości właściwego powierzchniowego oporu skrawania. Z drugiej strony siły skrawania można rozważać z punktu widzenia współczesnej mechaniki pękania. Prognozowanie wartości kąta ścinania z zastosowaniem modeli uwzględniających wiązkość materiału obrabianego, ścinanie w płaszczyźnie...
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Creating Hotel Services from a Perspective of Extraordinary Customer Experience
PublicationThis conceptual article aims to explore the process of providing hotel services in the context of requirements arising from the experience economy. Both the concept of experience marketing and the concept of customer experience management provided a theoretical framework for the discussion. Based on a review of literature and conclusions derived from hotel managers’ experiences, a research model is proposed, which may be of some...
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Tangible and intangible economic impact of hosting mega sporting events
PublicationDue to the fact that the impetus for the creation of this paper was inaccuracies in the results of research relating to the economic effects caused by the organisation of mega sporting events, an analysis of the impact of 1988-2008 mega sporting events on host economies was conducted. The research shows that in selected areas of the economy, sporting events can be identified, with occasional positive (SOG) and negative (WOG) economic...
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On Radar DoA Estimation and Tilted Rotating Electronically Scanned Arrays
PublicationWe consider DoA estimation in a monopulse radar system employing a tilted rotating array. We investigate the case of nonzero steering angles, in which case the mapping between the target’s azimuth and elevation in the global coordinate system and their counterparts in the array local coordinate system becomes increasingly nonlinear and coupled. Since estimating the azimuth using coherently integrated signals might be difficult because...
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Creating a Remote Choir Performance Recording Based on an Ambisonic Approach
PublicationThe aim of this paper is three-fold. First, the basics of binaural and ambisonic techniques are briefly presented. Then, details related to audio-visual recordings of a remote performance of the Academic Choir of the Gdańsk University of Technology are shown. Due to the COVID-19 pandemic, artists had a choice, namely, to stay at home and not perform or stay at home and perform. In fact, staying at home brought in the possibility...
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Enviromental factors az the elements determingthe development of floating homes
PublicationThe popularity of Floating Homes in Western Europe and North America is noticeable. The interest in thesefacilities in Poland is also constantly growing. The popularity of Floating Homes is due to climate change, risingland prices and population density in city centers. However, environmental factors play a significant role in theirdevelopment. The publication presents the results of research on the impact of environmental factors...
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Jeffreys heat conduction in coupled semispaces subjected to interfacial heating
PublicationA Jeffreys heat conduction problem for coupled semispaces subjected to the action of an interfacial heat source was defined. An analytical solution of the problem was derived for a polynomial specific power of the heat source using the Laplace transform approach. The asymptotic and parametric analysis was performed for different ratios of thermal conductivities , thermal diffusivities , thermal relaxation times and coefficients...
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Modelling and Analysis of the Positioning Accuracy in the Loading Systems of Mobile Cranes
PublicationIn this work, the authors analyse the influence of the order and range of sequential movements of a crane's working members on the accuracy of the final cargo positioning. The analysis was conducted on the basis of a specially developed method in which the authors proposed the introduction of a geometrical indicator of positioning the load in the intermediate positions (after completing each movement sequence) and in the target...
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Desiccant cooling system with direct fired biogas reactivitation heater.
PublicationPraca przedstawia możliwości wykorzystania w chłodnictwie i klimatyzacji gazu pochodzącego z biomasy. Spalanie gazu może zapewnić ciepło do zasilania zarówno absorpcyjnych urządzeń chłodniczych, jak i adsorpcyjnych urządzeń klimatyzacyjnych. Przedstawiono bieżące trendy występujące w konstrukcjach adsorpcyjnych urządzeń klimatyzacyjnych.
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Simplified unsteady flow routing models for flood operating systems
PublicationW pracy omówiono właściwości modeli uproszczonych transformacji przepływów nieustalonych z punktu widzenia możliwości zastosowania do sterowania falą powodziową.
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Loading pattern effects on fatigue resistance of slide bearing lining
PublicationPrzedstawiono relacje pomiędzy przebiegami obciążeń dynamicznych a stanem naprężeń w warstwie nośnej łożysk ślizgowych. Porównano przebiegi naprężeń dla maszyny badawczej MWO (z wirującym wektorem obciążenia) do naprężeń charakterystycznych dla maszyny SMOK (z jednokierunkowym zmiennym wektorem obciążenia).
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Fibre Bragg Grating pressure transducer using a profiled membrane.
PublicationW pracy przedstawiono nowatorską konstrukcję podwodnego światłowodowego przetwornika ciśnienia, w którym elementem czujnikowym jest światłowodowa siatka Bragga. W omawianym przetworniku siatka Bragga jest zapisana w światłowodzie domieszkowanym pierwiastkami ziem rzadkich i pracuje jako pompowany optycznie laser z rozłożonym sprzężeniem zwrotnym. Dzięki zastosowaniu profilowanej membrany uzyskuje się jednorodny rozkład naprężeń...
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Fixed roof to shell connection in tank with an internal floating cover.
PublicationReferat dotyczy projektowania połączenia dachu stałego zbiornika walcowego z płaszczem w przypadku zastosowania wewnętrznego przekrycia pływającego. Zaproponowano zastosowanie dodatkowego pierścienia usztywniającego, zabezpieczającego górną krawędź płaszcza zbiornika. Wyniki analiz z zastosowaniem metody elementów skończonych zamieszczono w formie map naprężeń.
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Validation of the Polish Version of the Penn Alcohol Craving Scale (PACS)
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Autonomous Energy Matching Control in an LLC Induction Heating Generator
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Dual-Frequency Induction Heating Generator With Adjustable Impedance Matching
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Heat calculations for water-cooled radiators of the inverter for induction heating
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Induction heating laboratory stand for estimating thermal properties of a charge
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The optimisation of induction heating system based on multiquadric function approximation
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Modeling of active fiber Bragg grating underwater acoustic sensor.
PublicationW pracy przedstawiono wyniki modelowania nowego typu przetwornika hydroakustycznego wykorzystującego światłowodową siatkę Bragga. Siatka ta, domieszkowana jonami pierwiastków ziem rzadkich, pracuje jako laser z rozłożonym sprzężeniem zwrotnym, co pozwala na znaczne zwiększenie czułości tego prztwornika w porównaniu z rozwiązaniami wykorzystującymi siatki pasywne. W celu uzyskania równomiernego rozkładu naprężeń siatki zastosowano...
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Thermally stimulated carrier transport due to stepwise sample heating.
PublicationPodano przybliżone rozwiązania równań nieizotermicznego transportu nośników w izolującym ciele stałym ze stanami pułapkowymi, dla przypadku krokowego ogrzewania próbki. Otrzymane wyniki zweryfikowano za pomocą symulacji Monte Carlo dla gaussowskiego rozkładu pułapek.
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Data Extraction, Transformation and Loading process in data warehouse development.
PublicationOmówiono podstawowe elementy procesu projektowania hurtowni danych.
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Ad hoc routing protocols - security objectives, threats and solution
PublicationZaprezentowano przykładowe strategie routingu stosowane w bezprzewodowych sieciach ad-hoc z transmisją wieloetapową. Dokonanao przegladu protokołow routingu, zidentyfikowano podstawowe typy ataków i zagrożenia integralności i poufności transmisji w sieciach bezprzewodowych. Przedstawiono przykładowe rozwiazania algorytmów routingu.
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Analysis of radial run-out of circular saw's cutting blades
PublicationW pracy przedstawiono analizę bicia promieniowego ostrzy pił tarczowych w procesie przecinania drewna. Analizę przeprowadzono na podstawie zróżnicowania grubości warstw skrawanych przez poszczególne ostrza piły. Dla przykładowej piły, zaprezentowano wyniki obliczeń przebiegów grubości warstw skrawanych przez poszczególne ostrza i grubości całkowitej warstwy skrawanej dla całej piły.
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Appraisement of modifications in dynamic routing protocols to support the IPng Protocol
PublicationW pracy, biorąc pod uwagę dynamiczny proces migracji sieci IPv4 do nowej wersji protokołu IP, przedstawiono konieczność realizacji w Internecie nowych protokołów routingu dynamicznego lub adaptacji już istniejących do nowego protokołu IPng. W artykule przedstawiono sposoby dostosowania protokołów routingu dynamicznego RIP, OSPF, BGP do nowego protokołu IP. Oceniono wpływ w/w dostosowywania na zbieżność i skalowalność protokołów...
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A design concept of fire protection system for an ecological floating dock
PublicationW artykule przedstawiono możliwe do wystąpienia na doku pływającym zagrożenie pożarowe oraz projekt koncepcyjny systemu zabezpieczenia przeciwpożarowego. Projekt ten obejmuje: istalację gaśniczą wodno-hydrantową i pianową do ochrony pokładu głównego oraz instalację CO2 do ochrony siłowni, rozdzielni elektrycznej i tunelu kablowego, a także instalację wykrywania i sygnalizacji pożaru.
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Mechanical Properties of Polyester Coated Fabric Subjected to Biaxial Loading
PublicationThe paper is focused on the comparison between uniaxial and biaxial laboratory test results for polyester coated fabric. A short literature review concerning coated woven fabrics with emphasis on biaxial tensile tests is presented. A description of the polyester-coated fabric under biaxial test by means of constitutive models and material parameter values is proposed. To establish the right values of the ultimate tensile strength,...
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Tuning of photocatalytic activity by creating a tridentate coordination sphere for palladium
PublicationThe synthesis and characterisation of an asymmetric potential bridging ligand bmptpphz (bmptpphz = 2,17-bis(4-methoxyphenyl)tetrapyrido[3,2-a:2’,3’-c:3’’,2’’-h:2’’’,3’’’-j] phenazine) is presented. This ligand contains a 1,10-phenanthroline (phen) and a 2,9-disubstituted phen sphere and possesses a strong absorbance in the visible. Facile coordination of the phen sphere to a Ru(tbbpy)2 core leads to Ru(bmptpphz) ([(tbbpy)2Ru(bmptpphz)](PF6)2;...
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Heat transfer characteristics of hybrid microjet – Microchannel cooling module
PublicationThe paper presents experimental investigation of heat transfer intensification in a microjet–microchannel cooling module. Applied technology takes benefits from two very attractive heat removal techniques. When jets are impinging on the surface, they have a very high kinetic energy at the stagnation point, also in microchannels boundary layer is very thin allowing to obtain very high heat fluxes. Main objective of this paper was...
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Reliability of Corroded Stiffened Plate Subjected to Uniaxial Compressive Loading
PublicationThe work is focused on the reliability of corroded stiffened plates subjected to compressive uniaxial load based on the progressive collapse approach as stipulated by the Common Structural Rules for Bulk Carriers and Oil Tankers, employing the limit state design. Two different cases have been investigated. In the first model, the corrosion degradation led to uniform thickness loss, whereas the mechanical properties were unchanged,...
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Innovative Turbine Intake Air Cooling Systems and Their Rational Designing
PublicationThe improved methodology of the engine intake air cooling system designing based on the annual effect due to cooling was developed. It involves determining the optimal value of cooling capacity, providing the minimum system sizes at maximum rate of annual effect increment, and its rational value, providing a close to maximum annual effect without system oversizing at the second maximum rate of annual effect increment within the...
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Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water
PublicationThe corrosion inhibition behavior of sodium nitrite (NaNO2) towards pure copper (99.95%) in simulated cooling water (SCW) was investigated by means of electrochemical impedance spectroscopy (EIS) and dynamic electrochemical impedance spectroscopy (DEIS). NaNO2 interferes with metal dissolution and reduce the corrosion rate through the formation or maintenance of inhibitive film on the metal surface. Surface morphologies illustrated...
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Virtual Engineering Factory: Creating Experience Base for Industry 4.0
PublicationABSTRACT In recent times, traditional manufacturing is upgrading and adopting Industry 4.0, which supports computerization of manufacturing by round-the-clock connection and communica- tion of engineering objects. Consequently, Decisional DNA- based knowledge representation of manufacturing objects, processes, and system is achieved by virtual engineering objects (VEO), virtual engineering processes (VEP), and virtual engineering...
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Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine
PublicationA small Counter-Rotating Wind Turbine (CRWT) has been proposed and its performancehas been investigated numerically. Results of a parametric study have been presented in this paper.As parameters, the axial distance between rotors and a tip speed ratio of each rotor have been selected.Performance parameters have been compared with reference to a Single Rotor Wind Turbine (SRWT).Simulations were carried out with Computational Fluids...
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Social benefits valuation of hosting non-mega sporting events
PublicationPurpose In the study, an attempt was made to estimate the social benefits resulting from three non-mega sporting events organized in Ergo Arena located on the border of two cities in Poland. By attributing a value to intangible social benefits, the intangible effect was determined and compared to the expenditure incurred in the construction of Ergo Arena Hall. Design/methodology/approach In order to value social intangible effects...
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Acoustic Heating Produced in the Thermoviscous Flow of a Shear-Thinning Fluid
PublicationThis study is devoted to the instantaneous acoustic heating of a shear-thinningfluid. Apparent viscosity of a shear-thinning fluid depends on the shear rate. Thatfeature distinguishes it from a viscous Newtonian fluid. The special linear combi-nation of conservation equations in the differential form makes it possible to derivedynamic equations governing both the sound and non-wave entropy mode inducedin the field of sound. These...