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Search results for: MATERIAŁY ELEKTROAKTYWNE
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Problem wyboru bezsmarowego materiału ślizgowego dla łożysk pracujących w warunkach małych oscylacji
PublicationOmówiono przyczyny przyspieszonego zużywania się elementów węzłów łożyskowych, w których zastosowano ekologiczne materiały bezsmarowe. Wykazano szczególny wpływ oscylacji o małej amplitudzie - najczęściej występujących w sposób niezamierzony w pracy łożyska - na zużywanie się materiałów.
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Zastosowanie tomografii do pomiaru zmian objetościowych materiału sypkiego w procesie opróżniania silosów
PublicationW artykule przedstawiono wyniki pomiarów zmian zagęszczeń materiału granulowanego podczas przepływu silosowego. Zastosowano metodę tomograficzną do ustalenia tych zmian. Doświadczenia wykonano dla różnych początkowych zagęszczeń piasku. Omówiono wady i zalety metody.
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Lignocellulosic Biomass from Grapevines as Raw Material for Particleboard Production
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OpenGL accelerated method of the material matrix generation for FDTD simulations
PublicationThis paper presents the accelerated technique of the material matrix generation from CAD models utilized by the finite-difference time-domain (FDTD) simulators. To achieve high performance of these computations, the parallel-processing power of a graphics processing unit was employed with the use of the OpenGL library. The method was integrated with the developed FDTD solver, providing approximately five-fold speedup of the material...
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Structured deformation of granular material in the state of active earth pressure
PublicationThe paper focuses on the ability of granular materials to undergo structured deformation by analysing the data from the retaining wall model tests and discrete element simulations. The structured deformation means the movement of a granular material which produces a stable, regular pattern of multiple shear bands. The paper's primary purpose is to study this kind of deformation for the selected data representing the state of active...
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Analysis of Transparent Concrete as an Innovative Material Used in Civil Engineering
PublicationSince the dawn of history concrete has been, right behind stone and brick, one of the oldest building materials. The ancient Romans took advantage of its opportunities. They constructed amazing architectural objects, which survived centuries as whole buildings or parts of them. Concrete is so ubiquitous, that when we are walking in a newer districts of cities we are virtually surrounded by concrete from everywhere. Sometimes...
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On Dynamic Extension of a Local Material Symmetry Group for Micropolar Media
PublicationFor micropolar media we present a new definition of the local material symmetry group considering invariant properties of the both kinetic energy and strain energy density under changes of a reference placement. Unlike simple (Cauchy) materials, micropolar media can be characterized through two kinematically independent fields, that are translation vector and orthogonal microrotation tensor. In other words, in micropolar continua...
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Thermal energy storage using stearic acid as PCM material
PublicationThis work presents an experimental study of thermal energy storage by use of PCM. The aim of the study was to establish the influence of different inlet temperature of heat transfer fluid (HTF) and different Reynolds number of HTF on intensity of charging process. The PCM used in this study was stearic acid and water was used as HTF. A copper helical coil mounted in cylindrical container served as a heat transfer surface.
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JERUSALEM ARTICHOKE (HELIANTHUS TUBEROSUS L.) AS ENERGY RAW MATERIAL
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Correction: MOF-5 derived carbon as material for CO2 adsorption
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Environmentally friendly material solutions in the technology of autoclaved aerated concrete
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Chestnut-Derived Activated Carbon as a Prospective Material for Energy Storage
PublicationIn this work, we present the preparation and characterization of biomass-derived activatedcarbon (AC) in view of its application as electrode material for electrochemical capacitors. Porouscarbons are prepared by pyrolysis of chestnut seeds and subsequent activation of the obtainedbiochar. We investigate here two activation methods, namely, physical by CO2and chemical usingKOH. Morphology, structure and specific surface area (SSA)...
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Elastoplastic material law in 6-parameter nonlinear shell theory
PublicationWe develop the elastoplastic constitutive relations for nonlinear exact 6-parameter shell theory. A J2-type theory with strain hardening is formulated that takes into account asymmetric membrane strain measures. The incremental equations are solved using implicit Euler scheme with closest point projection algorithm. The presented test example shows the correctness of the proposed approach. Influence of micropolar material parameters...
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The influence of core material on strength properties of hybrid sandwich panels
PublicationAlong with high prices of fuels and more restrictive safety and environmental regulations (including environment protection) increased interest in sandwich structures is being observed. One of the solution having growing application potential is steel sandwich panel. The construction consist of very thin steel plates (about 2mm) and stiffeners between them. The main advantage of using such solution is very high strength to weight...
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Material for Automatic Phonetic Transcription of Speech Recorded in Various Conditions
PublicationAutomatic speech recognition (ASR) is under constant development, especially in cases when speech is casually produced or it is acquired in various environment conditions, or in the presence of background noise. Phonetic transcription is an important step in the process of full speech recognition and is discussed in the presented work as the main focus in this process. ASR is widely implemented in mobile devices technology, but...
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Timber - material of the future. Examples of small wooden architecture structures.
PublicationThe aim of this article is to present various types of wood-based products, classified as engineered timber, while specifying the implications of their structural properties for their forms. Timber is used as a construction material due to its fire resistance, good structural characteristics and insulating properties. The advent of new technologies of wood processing and wood-based materials production has converted timber into...
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Vitreous humour – routine or alternative material for analysis in forensic medicine
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Pilot- scale plant for material recycling of whole waste tires
PublicationContinously growing demad for all kinds of vehicles and general tendency to regular exchange of tires are causing growth of scrap tires which need management. A risings of large quantities of used rubber products, especially used tires has been increasing every year in Poland, in 2006 it was 160 thousand. The waste management and recycling of used tires become a major environmental problem. It is worth noticing that tires which...
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Experimentation, material modelling and simulation of bonded joints with a flexible adhesive
PublicationThe paper deals with material parameters identification of a flexible adhesive and the numerical simulation of its behaviour in a single lap bonded joint. The material modelling was based on the simple shear and tensile-shear laboratory tests of the bonded joints made of thin aluminium and polyurethane plates with the flexible adhesive Terostat MS 9360 manufactured by Henkel AG & Co. The adhesive was considered as a hyperelastic...
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Investigation of multilayer three-strip coplanar lines with the ferrite material
PublicationW artykule opisano wyniki badań przeprowadzonych nad wielowarstwową linią koplanarną zawierającą trzy paski umieszczone na podłużnie magnesowanym ferrycie. Analiza opiera się o metodę rodzajów sprzężonych. Uzyskane rezultaty zostały zweryfikowane eksperymentalnie.
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The new concept of material.Material "przekryciowo-izolacyjny" "Cover & insulation" material
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Biomass of freshwater Cladophora as a raw material for agriculture and the cosmetic industry
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Material independent effectiveness of workpiece vibration in μ-EDM drilling
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Hazardous material-related propagation of the effects of train accidents in the subgrade
PublicationA large part of the transport of hazardous materials is carried out by rail. Therefore, the security of these transports is becoming increasingly important. Every catastrophe involving dangerous materials has a negative impact on the participants of the incident and the surrounding environment, because its range is generally not local. It follows that in the event of a catastrophe, its effects should be minimized and remediation...
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Design and material selection for a patient transport device in field hospitals
PublicationACKGROUND: A major cause of patient and hospital worker injuries occurs transferring patients between two planes. The main aim of this paper was to propose a design of patient’s lift and transfer apparatus for use in field hospitals. The assumption was to design lightweight, durable and ergonomic device using innovative material. The authors concentrated on partial elimination of manual lifting in order to device could work both...
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A material model of asphalt mixtures based on Monte Carlo simulations
PublicationThe paper aims to numerically reflect mineral-asphalt mixture structure by a standard FEM software. Laboratory test results are presented due to bending tests of circular notched elements. The result scatter is relatively high. An attempt was made to form a random aggregate distribution in order to obtain various results corresponding to laboratory tests. The material structure calibration, its homogenization and finite element...
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The Impact of Contemporary Technology on Shell Structures: Material and Light Solutions
PublicationWith the development of technology and the materials used, shell structures have developed into more complex forms. This article is a comparison between contemporary and historical shell structures. The change is an effect of the evolution in the design process that is the result of parametric design thinking. The study aims to investigate the impact of new technologies on the architectural form of shell structures. Was there any...
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Influence of Material Thickness on the Ductile Fracture of Steel Plates for Shipbuilding
PublicationIn the shipbuilding industry, the risk of brittle fractures is relatively high because some units operate in arctic or subarcticzones and use high thickness (up to 100 mm) steel plates in their structures. This risk is limited by employing certifiedmaterials with a specific impact strength, determined using the Charpy method (for a given design temperature) and byexercising control over the welding processes (technology qualification,...
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Nonlinear material identification of heterogeneous isogeometric Kirchhoff–Love shells
PublicationThis work presents a Finite Element Model Updating inverse methodology for reconstructing heterogeneous materialdistributions based on an efficient isogeometric shell formulation. It uses nonlinear hyperelastic material models suitable fordescribing incompressible material behavior as well as initially curved shells. The material distribution is discretized by bilinearelements such that the nodal values...
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Composite as a Material of the Future in the Era of Green Deal Implementation Strategies
PublicationComposite materials have become synonymous with modernity, desired in nearly every aspect of our daily lives, from simple everyday objects to sanitary facilities, pipelines, the construction of modern sewer networks, their renovation, water supply, and storage reservoirs, to complex structures—automotive, planes, and space science. Composites have seen a considerable rise in attention owing to their characteristics, durability,...
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Numerical simulations of granular material flow in silos with and without insert
PublicationArtykuł omawia wyniki naporu materiału sypkiego podczas przepływu w silosach z i bez wkładek. Obliczenia wykonano wykorzystując sformułowanie ale na bazie prawa sprężysto-plastycznego według druckera-pragera. Zbadano wpływ kształtu i położenia wkładki na wielkość naporu i rodzaj przepływu.
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Design and Utility of Specialist Comminution Set-Up for Plastics and Organic Materials
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Coefficients for Assessing the Visibility of Materials Used in Anti-Smog Face Masks
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Efficiency of Filtering Materials Used in Respiratory Protective Devices Against Nanoparticles
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Modified Polymer Materials for Use in Selected Personal Protective Equipment Products
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Wear measurements of self-lubricating bearing materials in small oscillatory movement
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Zjawiska magnetosprężyste i ich wykorzystanie w nieniszczących badaniach materiałów.
PublicationPrzedstawiono własności stosowanych w diagnozowaniu efektów dotyczących procesu magnesowania ferromagnetyka (efekt Barkhausena polowy, emisja magnetoakustyczna) oraz wpływu naprężeń zmiennych na ferromagnetyk (mechaniczny efekt Barkhausena, emisja mechano-magnetoakustyczna ). Opisano aparaturę służącą do badania tych efektów.
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Korelacja między pracą odkształcania plastycznego powierzchni a odpornością kawitacyjną materiałów
PublicationPrzedstawiono badania kawitacyjne stali 45, 2H13 i OH18N9 w okresie inkubacji i porównano wyniki tych badań ze wskaźnikami charakteryzującymi odporność materiału, otrzymanymi na podstawie całych krzywych erozyjnych.
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Explicit accumulation model for granular materials under multiaxial cyclic loading.
PublicationPróba korelacji parametrów modelu akumulacyjnego piasku z wynikami badań dynamicznych piasku.
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Estimation of optical parameters of highly scattering materials by time-of-flight spectroscopy.
PublicationPrzedstawiono metody wyznaczania podstawowych parametrów materiałów silnie rozpraszających światło na podstawie pomierzonego rozkładu czasu przelotu krótkich impulsów laserowych. W algorytmie wykorzystano metodę Monte Carlo i metodę dyfuzji do opisu propagacji światła. Oszacowano dokładność oszacowywania tych parametrów.
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Theoretical analysis of current induced by high-energetic radiation in dielectric materials
PublicationW pracy poddano analizie mechanizmy generacji i rekombinacji nośników ładunku w obecności wysokoenergetycznego promieniowania. Przedstawiono zależności gęstości prądu elektrycznego od natężenia promieniowania i napięcia polaryzujacego próbkę.
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Zastosowanie automatu komórkowego do przepływu materiałów sypkich w silosach
PublicationW pracy przedstawiono możliwość zastosowania aparatu komórkowego do modelowania przepływów silosowych. Wykonano obliczenia dwu- i trójwymiarowe dla różnych rodzajów wkładek silosowych, ścianek szorstkich i gładkich, różnych kształtów silosu, różnej ilości komórek oraz schematów migracji. Obliczenia numeryczne porównano z wynikami doświadczeń.
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Metody udostępniania materiałów multimedialnych w sieciach LAN i WAN.
PublicationW referacie przedstawiono możliwości wzbogacania treści edukacyjnych dzięki wykorzystaniu technik multimedialnych. Uzupełnienie materiału edukacyjnego w postaci plików audio oraz wideo daje zupełnie nową jakość . Opisano jak stworzyć taki materiał, jaki jest potrzebny do realizacji oraz jak bardzo czasochłonny jest ten proces. Wnioski i spostrzeżenia zostały przedstawione na podstawie praktycznej realizacji wykładu dot. Systemu...
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Metody udostępniania materiałów multimedialnych w sieciach LAN I WAN.
PublicationWraz z rozpowszechnianiem usług szerokopasmowych zmniejsza się ograniczenie co do objętości oferowanych materiałów edukacyjnych udostępnianych w sieciach LAN i WAN. W referacie przedstawiono możliwości wzbogacenia treści edukacyjnych dzięki wykorzystaniu technik multimedialnych. Uzupełnienie materiału edukacyjnego w postaci plików audio i wideo daje zupełnie nową jakość. Opisano jak stworzyć taki materiał, jaki sprzęt jest potrzebny...
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Analysis of different approaches of capillary rise method for characterization of porous materials
PublicationPomiar kąta zwilżania materiałów porowatych metodą wzniesienia kapilarnego został opisany przez wielu badaczy, jakkolwiek problem ten jest wciąż dyskutowany. Niniejsza praca dotyczy oceny wzniesienia kapilarnego za pomocą równania Washburn'a. Wykonano badania oparte na pomiarze masy i wysokości lustra cieczy zwilżającej w funkcji czasu wzniesienia w złożu wykonanym z kulek szklanych. Uzyskane wyniki były analizowane z użyciem równania...
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Zastosowanie metody analizy obrazu w określaniu odporności kawitacyjnej materiałów
PublicationPrzedstawiono optyczną metodę określania właściwości kawitacyjnych materiału oraz charakterystyki kawitacyjnej stanowiska przy zastosowaniu komputerowej analizy obrazu erodowanej powierzchni uzyskanego w mikroskopie świetlnym.
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Polysaccharides-Based Hybrid Materials for Bio- and Non-Bio Sectors. Edytorial
PublicationThis special edition spotlights the recent research in the design, development, and emerging applications of polysaccharides-based hybrid materials for biotechnological and biomedical purposes. All the articles published in this issue underscore the significance of materials derived from cellulose, alginate, chitosan, starch, and carrageenan for various applications, including enzyme production, encapsulation, targeted drug delivery,...
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New empirical correlations for the viscosity of selected organic phase change materials
PublicationAlthough there are many methods and instruments for measuring viscosity, it is still difficult to determine a reliable value of the dynamic viscosity of complex chemicals such as paraffins and fatty acids. This is due to the complex and heterogeneous structure of these compounds in the case of commercial products. On the other hand, the measuring instrument should be selected very carefully, including its measuring principle and...
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Non-Destructive Testing for the In Situ Assessment of the Ionic Flux in Cementitious Materials
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Structural and electrical properties of Cr-doped SrTiO 3 porous materials
PublicationSeries of single-phase materials with assumed formula SrTi1−xCrxO3 (where x = 0, 1, 4, 6 mol.%) were obtained by sol-gel method. The structure and microstructure of materials were characterised by X-ray diffraction and scanning electron microscopy methods. Moreover, the study of electrical properties and evaluation of chemical stability in CO2/H2O atmosphere was performed by electrochemical impedance spectroscopy and thermogravimery...