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Wyniki wyszukiwania dla: PANI/WO3 COMPOSITE
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PANI/NaTaO3 composite photocatalyst for enhanced hydrogen generation under UV light irradiation
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Photoelectric properties of WO3/tetracene hetrojunctions
PublikacjaPraca omawia własności fotowoltaiczne heterozłączy: WO3-tetracen. W pracy przedstawiono wyniki badań dwóch struktur planarnych: ITO/tetracen/Ag i ITO/WO3/tetracen/Ag. Badania obejmowały pomiary charakterystyk prądowo-napięciowych, zależności prądu zwarcia i napięcia rozwarcia od natężenia oświetlenia oraz spektralne charakterystyki prądu zwarcia.
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Evolution of the surface species of the V2O5–WO3 catalysts
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An Aqueous Exfoliation of WO3 as a Route for Counterions Fabrication—Improved Photocatalytic and Capacitive Properties of Polyaniline/WO3Composite
PublikacjaIn this paper, we demonstrate a novel, electrochemical route of polyaniline/tungsten oxide (PANI)/WO3) film preparation. Polyaniline composite film was electrodeposited on the FTO (fluorine-doped tin oxide) substrate from the aqueous electrolyte that contained aniline (monomer) and exfoliated WO3 as a source of counter ions. The chemical nature of WO3 incorporated in the polyaniline matrix was investigated using X-ray photoelectron...
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Quantum chemical modelling of the process of lithium insertion into WO3 films
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The Effect of Calcination Temperature on Structure and Photocatalytic Properties of WO3/TiO2 Nanocomposites
PublikacjaSeries ofWO3/TiO2 nanocompositeswere obtained by hydrothermal method followed by calcination in the temperature range from 400∘C to 900∘C. The characteristics of photocatalysts by X-ray diffractometry (XRD), scanning electron microscope (SEM), and diffuse reflectance spectroscopy (DRS) showed that increasing the calcination temperature from 400 to 900∘C resulted in change of photocatalytic activity under UV-Vis light.Moreover,...
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UV-Light-Induced Fluctuation Enhanced Sensing by WO3-Based Gas Sensors
PublikacjaWO3-based gas sensors were investigated under UV-light irradiation and at different working temperatures with the object of achieving superior sensitivity and selectivity. Resistance fluctuations in the WO3 layer were studied together with dc resistance measurements. The data were taken in synthetic air, ethanol, nitrogen dioxide, and mixtures of these gases. We conclude that UV irradiation can easily be applied to enhance the...
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An NO2 sensor based on WO3 thin films for automotive applications in the microwave frequency range
PublikacjaA microwave system dedicated to the detection of nitrogen dioxide in the harsh environment of the Norway highways is proposed. An optimized transmission line type of sensor coated with a tungsten trioxide thin film that changes its electrical properties under NO2 gas exposure is developed. The sensors' response (S) is given in °/GHz and it is calculated based on wideband measurements. The advantage of wideband measurements in comparison...
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An Easy and Ecological Method of Obtaining Hydrated and Non-Crystalline WO3−x for Application in Supercapacitors
PublikacjaIn this work, we report the synthesis of hydrated and non-crystalline WO3 flakes (WO3−x) via an environmentally friendly and facile water-based strategy. This method is described, in the literature, as exfoliation, however, based on the results obtained, we cannot say unequivocally that we have obtained an exfoliated material. Nevertheless, the proposed modification procedure clearly affects the morphology of WO3 and leads to loss...
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Influence of alkali metal cations on the photoactivity of crystalline and exfoliated amorphous WO3 – photointercalation phenomenon
PublikacjaIn order to investigate the effect of photointercalation on photoelectrochemical properties, two types of WO3-based photoanodes, bulk and exfoliated have been prepared and investigated. An aqueous exfoliation method is introduced for the simple fabrication of amorphous and hydrated WO3 nanomaterial using commercial bulk WO3 precursor. The comparison of obtained material with bulk WO3 was performed using Raman, UV–vis, and XPS as...
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Badania nad wykorzystaniem fotokatalizatorów WO3/TiO2 do degradacji wybranych zanieczyszczeń organicznych
PublikacjaW dysertacji skupiono się na: preparatyce fotokatalizatorów WO3/TiO2, weryfikacji efektywności działania kompozytów w kierunku fotokatalitycznego usuwania zanieczyszczeń oraz analizie wyników pod kątem zaprojektowania i skonstruowania fotoreaktora wyposażonego w sterowane źródło światła LED do fotokatalitycznej degradacji zanieczyszczeń. Fotokatalizatory otrzymano łącząc dwie metody preparatyki – zol-żel i hydrotermalną. Otrzymano...
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On a flexomagnetic behavior of composite structures
PublikacjaThe popularity of the studies is getting further on the flexomagnetic (FM) response of nano-electro-magneto machines. In spite of this, there are a few incompatibilities with the available FM model. This study indicates that the accessible FM model is inappropriate when considering the converse magnetization effect that demonstrates the necessity and importance of deriving a new FM relation. Additionally, the literature has neglected...
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Sensitivity analysis of a composite footbridge
PublikacjaThis work include an example of sensitivity analysis for the design of a composite footbridge. A sandwich structure is used, consisting two high-strength skins separated by a core material. The analysis was conducted for two numerical models. The first one is a simple, single-span beam of a composite cross-section (laminate and foam), with different Young’s modulus for each material. Calculations were made by means of a MATLAB-based...
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Characterization of CaTi0.9Fe0.1O3/La0.98Mg0.02NbO4 composite
PublikacjaA composite of CaTi0.9Fe0.1O3 and electrolyte material, i.e. magnesium doped La0.98Mg0.02NbO4 was prepared and studied. The phase content and the sample microstructure was examined by an X-ray diffraction method and scanning electron microscopy. EDS measurements were done both for composite samples and the diffusion couple. The electrical properties were studied by four terminal DC method. The Ahigh-temperature interaction between...
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Modern GFRP Composite Footbridges
PublikacjaApplication of GFRP composites in civil engineering is still not large but already noticeable. Advantages of this material, such as: low volume weight, relatively high stiffness and strength, well fatigue resistance, easiness in shaping, high material damping and high environmental resistance, make it attractive for bridge and in particular foot-bridge designers. It is estimated that nowadays in the world there are realized hundreds...
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Pilot-Scale Studies of WO3/S-Doped g-C3N4 Heterojunction toward Photocatalytic NOx Removal
PublikacjaDue to the rising concentration of toxic nitrogen oxides (NOx) in the air, effective methods of NOx removal have been extensively studied recently. In the present study, the first developed WO3/S-doped g-C3N4 nanocomposite was synthesized using a facile method to remove NOx in air efficiently. The photocatalytic tests performed in a newly designed continuous-flow photoreactor with an LED array and online monitored NO2 and NO system...
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Enhanced Visible Light Active WO3 Thin Films Toward Air Purification: Effect of the Synthesis Conditions
PublikacjaTaking into consideration, our current environmental situation in the world people should face with growing problem of air and water pollution. Heterogeneous photocatalysis is highly promising tool to improve both, air and water quality through decomposition/mineralization of contaminations directly into harmless CO2 and H2O under ambient conditions. In this contribution we focused on the synthesis of self-assembly WO3 thin films...
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Fluctuation enhanced gas sensing using UV irradiated Au-nanoparticle-decorated WO3-nanowire films
PublikacjaWO3 nanowires (WO3-NWs) decorated with gold nanoparticles (AuNPs) were utilized in resistive gas sensor devices to detect ethanol by use of fluctuation enhanced sensing (FES). The experimental system records both DC resistance and fluctuations of the sensing film. Our data verify that the sensitivity and selectivity of the gas sensor are improved by applying FES when the sensor is stimulated with a combination of UV light and heating....
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Współczesne technologie pali.
PublikacjaPrzedstawiono współczesne technologie pali. Przede wszystkim uwagę zwrócono na pale wbijane, pale przemieszczeniowe bez rury obsadowej oraz iniekcję pod podstawami i na pobocznicy pali.
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Badania dynamiczne pali.
PublikacjaOpis wykonywanych w Polsce badań dynamicznych pali. Omówiono podstawy teoretyczne oraz charakterystykę badań długości i ciągłości pali oraz badań nośności. Przedstawiono również warunki prawidłowego wykonywania badań dynamicznych i przykłady przeprowadzonych przez autorów badań.
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Preparation of a Ceramic Matrix Composite Made of Hydroxyapatite Nanoparticles and Polylactic Acid by Consolidation of Composite Granules
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Weak localization competes with the quantum oscillations in a natural electronic superlattice: The case of Na1.5(PO2)4(WO3)20
PublikacjaWe report an investigation of the combined structural and electronic properties of the bronze Na1.5(PO2)4(WO3)20. Its low-dimensional structure and possible large reconstruction of the Fermi surface due to charge density wave instability make this bulk material a natural superlattice with a reduced number of carriers and Fermi energy. Signatures of multilayered two-dimensional (2D) electron weak localization are consequently reported,...
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Exhaled breath gas sensing using pristine and functionalized WO3 nanowire sensors enhanced by UV-light irradiation
PublikacjaThe development of advanced metal-oxide-semiconductor sensing technologies for the detection of Volatile Organic Compounds (VOCs) present in exhaled breath is of great importance for non-invasive, cheap and fast medical diagnostics. Our experimental studies investigate the effects of operating temperature selection and UV-light irradiation on improving the response of WO3 nanowire sensors towards exhaled breath exposure. Herein,...
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Fluctuation enhanced gas sensing with WO3-based nanoparticle gas sensors modulated by UV light at selected wavelengths
PublikacjaThe sensitivity and selectivity of WO3-based gas sensors can be enhanced by UV-irradiation-induced modulation, especially if different wavelengths are employed. We used fluctuation-enhanced gas sensing, based on measurements of resistance fluctuations in the gas sensor, to study the effects of such modulation on the noise intensity for ambient atmospheres of synthetic air without and with additions of small amounts of ethanol,...
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Structural Dynamics and Stability of Composite Structures
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Imperfection sensitivity of multilayered composite shells
PublikacjaW pracy analizowana jest stateczność cylindrycznej powłoki warstwowej poddanej osiowemu ściskaniu. Badany jest wpływ początkowych imperfekcji geometrycznych na zachowanie konstrukcji. Obliczenia realizowane są w programie Nastran (ver. 6.0).
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Structural Dynamics and Stability of Composite Structures
PublikacjaThis an editorial for a special Issue devoted to the application of dynamic and stability analysis of composite structures. In structural applications, past few decades have seen outstanding advances in the use of composite materials including Functionally Graded Materials (FGM). Most structures, whether they are used in civil, marine, or aerospace engineering, are subjected to dynamic loads during their operation.Therefore, dynamic...
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System information propagation for composite structures
PublikacjaWe study in details decoherence process of a spin register, coupled to a spin environment. We use recently developed methods of information transfer study in open quantum systems to analyze information flow between the register and its environment. We show that there are regimes when not only the register decoheres effectively to a classical bit string, but this bit string is redundantly encoded in the environment, making it available...
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Local buckling of composite channel columns
PublikacjaThe investigation concerns local buckling of compressed flanges of axially compressed composite channel columns. Cooperation of the member flange and web is taken into account here. The buckling mode of the member flange is defined by rotation angle a flange about the line of its connection with the web. The channel column under investigation is made of unidirectional fibre-reinforced laminate. Two approaches to member orthotropic...
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Composite GFRP U-shaped footbridge
PublikacjaThe paper presents proposals for the use of glass fiber reinforced polymer composites for the construction of engineering objects, known and commonly used in the shipbuilding industry. An example of a pedestrian footbridge was used in this case, which, despite the considerable thickness of the structural material, was made using infusion technology in one production cycle. The designed and produced footbridge span is durable, dynamically...
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Quantitative Storytelling in the Making of a Composite Indicator
PublikacjaThe reasons for and against composite indicators are briefly reviewed, as well as the available theories for their construction. After noting the strong normative dimension of these measures—which ultimately aim to ‘tell a story’, e.g. to promote the social discovery of a particular phenomenon, we inquire whether a less partisan use of a composite indicator can be proposed by allowing more latitude in the framing of its construction....
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PREPARATION AND CHARACTERIZATION OF CoFe2O4/TiO2-PANI HYBRID NANOCOMPOSITE WITH MAGNETIC AND PHOYOCATALYTIC ACTIVITY
PublikacjaHybrid nanocomposites consisting of inorganic component and organic conducting polymer are promising materials, which can be applied in heterogeneous photocatalysis. Titanium(IV) oxide is widely used photocatalysts due to its non-toxicity, low cost and chemical stability. The main disadvantage of TiO2 is low photocatalytic activity under visible light. Conducting polymers, also known as conjugated polymers are polymer materials...
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Badania dynamiczne nośności pali
PublikacjaPrzedstawiono wyniki nowoczesnych badań dynamicznych dla pali wierconych. Zgodnie z zaleceniami Eurokodu 7 wyniki tych badań skorelowano z wynikami próbnych obciążeń statycznych. Sukcesywnie gromadzone wyniki badań dynamicznych wraz z wartościami współczynników tłumienia,określonymi dla warunków polskich, będą wykorzystane przy opracowaniu Załącznika Krajowego do EC7.
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Badania dynamiczne nośności pali
PublikacjaPrzedstawiono wyniki nowoczesnych badań dynamicznych dla pali wierconych. Zgodnie z zaleceniami Eurokodu 7 wyniki tych badań skorelowano z wynikami próbnych obciążeń statycznych. Sukcesywnie gromadzone wyniki badań dynamicznych wraz z wartościami współczynników tłumienia, określonymi dla warunków polskich, będą wykorzystane przy opracowaniu Załącznika Krajowego do EC7.
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Naprawa pali konstrukcji hydrotechnicznych.
PublikacjaW pracy dokonano oceny możliwości naprawy pali stalowych i żelbetowych pracujących w środowisku wodnym. Scharakteryzowano metody naprawy pali w strefie nadwodnej i podwodnej.
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Współczesne technologie wykonawstwa pali.
PublikacjaPrzedstawiono współcześnie stosowane technologie pali. Szczególną uwagę zwrócono na pale w pełni przemieszczeniowe oraz pale z iniekcją pod podstawę i na pobocznicy.
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Nowe technologie wykonywania pali.
PublikacjaPrzedstawiono najnowsze krajowe trendy w wykonawstwie pali fundamentowych. Skrótowo omówiono technologie wykonywania pali CFA, jet-grouting, Vibrex, wkręcanych Vibro-Fundex, Tubex oraz pali wierconych wielkośrednicowych.
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DSP techniques for determining ''Wow'' distortions
PublikacjaArtykuł przedstawia opis algorytmów do wyznaczania charakterystyki zniekształceń kołysania dźwięku. Są to algorytmy: śledzenia przydźwięku sieciowego, śledzenia pozostałości magnetycznej prądu podkładu wielkich częstotliwości, adaptacyjnej analizy środka ciężkości widma dla wybranej części zniekształconego sygnału. Przedstawione algorytmy pozwalają na implementację programową i sprzętową.
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Ustawa o WOH a planowanie przestrzenne
Publikacja11 maja Sejm uchwalił budzącą wiele emocji Ustawę o tworzeniu i działaniu wielkopowierzchniowych obiektów handlowych (o WOH). Zgodnie z uchwaloną definicją wielkopowierzchniowym obiektem handlowym jest obiekt o powierzchni sprzedaży powyżej 400 m2, prowadzący jakąkolwiek działalność handlową. Mimo iż Ustawie o WOH przyświecają szczytne cele racjonalizacji wykorzystania zasobów miejskich, jej skutki mogą w istocie negatywnie wpłynąć...
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DSP techniques in wow defect evaluation
PublikacjaReferat przedstawia dwie metody określania przebiegu pasożytniczego drżenia dźwięku. Obie wykorzystują analizę pasożytniczych artefaktów. Wybrane artefakty to: przydźwięk sieciowy i wysokoczęstotliwościowy prąd podkładu. Precyzyjny przebieg zniekształcenia kołysania oblicza się wykorzystując informacje zawarte w widmie sygnałów, a uzyskane poprzez STFT lub modelowanie AR. Referat zawiera opis eksperymentów i uzyskane wyniki.
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New LED photoreactor with modulated UV–vis light source for efficient degradation of toluene over WO3/TiO2 photocatalyst
PublikacjaThe efficiencies of prepared WO3/TiO2 photocatalysts with varying amounts of WO3 were evaluated for gas-phase photocatalytic degradation of toluene. The obtained results revealed that the best photocatalytic properties were characteristic for samples calcined at 500ºC, which can be associated with high crystalline phase content (> 97%) and favourable BET surface area. The photocatalytic degradation tests were performed in two photoreactors...
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Mathematical modelling: Lessons from composite indicators
PublikacjaWe discuss here composite indicators as mathematical models, which can be looked at through the lenses of the five rules discussed in this volume. Composite indicators sit between analysis and advocacy, and their use has social and political implications. For this reason, the lenses of the manifesto can be used to build them better, to make them more transparent, as well as to inspect incumbent indicators for methodological or...
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Flexomagnetic response of buckled piezomagnetic composite nanoplates
PublikacjaIn this paper, the equation governing the buckling of a magnetic composite plate under the influence of an in-plane one-dimensional magnetic field, assuming the concept of flexomagnetic and considering the resulting flexural force and moment, is investigated for the first time by different analytical boundary conditions. To determine the equation governing the stability of the plate, the nonlocal strain gradient theory has been...
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Numerical simulation of laminate composite specimens failure
PublikacjaThis work presents some numerical results concerning simulation of failure of laminate composite specimens. In the article two tests to determine ultimate strength in an orthotropic layer, are considered: tension (TT1) and compression (TC1) test. The outcome is compared with experimental data provided by [9,10].
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Damage Detection of Steel-Concrete Composite Beam
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Tribological Behaviour of Copper-Graphene Composite Materials
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Wavelet Analysis for Damage Identification in Composite Structures
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Wavelet analysis for damage identification in composite structures
Publikacjaw pracy zaproponowano metodę analizy sygnalu opartą o transformatę falkową, pozwalajacą na identyfikcaje pęknięcia zmęczeniowego w jednowymiarowych elementach konstrukcyjnych wykonanych z materialow kompozytowych
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Some kind of joints in composite polymer bridges
PublikacjaContemporary, polymer composites bridge structures are of two types: truss or arch structures(with many joints along the length) and beam structures with limited number of joints. Both of them have special types of composite polymer decks. An ideal solution is to join advantages of two types of structuresdescribed below and create long span FRP beam bridge structure system using joints along the length. Theproblem is to find the...
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Failure Analysis of footbridge made of composite materials
PublikacjaFinite element method analysis of a pedestrian footbridge made of sandwich material is presented. The internal structure of the material is modelled as a structural shell assuming the Equivalent Single Layer approach (ESL). Two FEM commercial codes are employed. The response of the structure is studied in order to determine the load level that activates Hashin and Tsai-Wu failure criteria. Some practical aspects of designing footbridges...