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Search results for: THERMAL DEGRADATION KINETICS
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Study on effective front region thickness of PCM in thermal energy storage using a novel semi-theoretical model
PublicationThermal energy storage in mobile applications, particularly battery of electric vehicles, is currently gaining a lot of importance. In this paper, a semi-theoretical time-dependent mathematical model of the phase change in a double shell thermal energy storage module has been developed where the inner tube is a heat exchange surface. An effective front region thickness for the melting and solidification process has been studied....
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Novel Cast Polyurethanes Obtained by Using Reactive Phosphorus-Containing Polyol: Synthesis, Thermal Analysis and Combustion Behaviors
PublicationPhosphorus-containing polyol applications in polyurethane synthesis can prevent volatilization of flame retardants and their migration on the surface of a material. In this work, novel cast polyurethanes were prepared by a one-step method with the use of different amounts of phosphorus-containing polyol, 4,4′–diphenylmethane diisocyanate and 1,4-butanediol. The chemical structure, thermal, physicochemical and mechanical properties...
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Evolution of the nanostructure of Pt and Pt–Co polymer electrolyte membrane fuel cell electrocatalysts at successive degradation stages probed by X-ray photoemission
PublicationWe present a set of XPS (X-ray photoemission spectroscopy) measurements and detailed data-analysis of electrodes for polymer electrolyte membrane fuel cell (PEMFC) based on carbon supported catalysts (Pt and Pt–Co) subjected to a step-like potential cycling (accelerated degradation test). The results of the measurements complete and corroborate parallel TEM (transmission electron microscopy), XRD (X-ray diffraction) and XAS (X-ray...
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Chemical Structure and Thermal Properties versus Accelerated Aging of Bio-Based Poly(ether-urethanes) with Modified Hard Segments
PublicationAging of polymers is a natural process that occurs during their usage and storage. Predicting the lifetime of polymers is a crucial aspect that should be considered at the design stage. In this paper, a series of bio-based thermoplastic poly(ether-urethane) elastomers (bio-TPUs) with modified hard segments were synthesized and investigated to understand the structural and property changes triggered by accelerated aging. The bio-TPUs...
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Thermal Image Processing for Respiratory Estimation from Cubical Data with Expandable Depth
PublicationAs healthcare costs continue to rise, finding affordable and non-invasive ways to monitor vital signs is increasingly important. One of the key metrics for assessing overall health and identifying potential issues early on is respiratory rate (RR). Most of the existing methods require multiple steps that consist of image and signal processing. This might be difficult to deploy on edge devices that often do not have specialized...
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Inter-laboratory proficiency tests in measuring thermal insulation and evaporative resistance of clothing using the Newton-type thermal manikin
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Thermal analysis and experimental verification of permanent magnet synchronous motor by combining lumped-parameter thermal networks with analytical method
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On description of periodic magnetosonic perturbations in a quasi-isentropic plasma with mechanical and thermal losses and electrical resistivity
PublicationMagnetosonic periodic perturbations in a uniform and infinite plasma model are considered. Damping due to compressional viscosity, electrical resistivity, and thermal conduction are taken into account, as well as some heating–cooling function, which may destroy the isentropicity of wave perturbations. The wave vector forms arbitrary angle h with the equilibrium straight magnetic field, and all perturbations are functions...
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The influence of chitosan hydrogel coating on different redox probes kinetics
Open Research DataThis dataset contains cyclic voltammetry studies of three redox probes: 1 mM K3[Fe(CN)6], [K4Fe(CN)6], C12H14FeO2, and [Ru(NH3)6]Cl2 dissolved in 0.1 M KCl or PBS as the primary electrolyte. The studies are made for glassy carbon electrode (GC) and glassy carbon electrode covered with thin chitosan hydrogel membrane (C2A2). Cyclic voltammograms were...
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The Application of the Thermal Stabilization Prompted by the Ice Cover Expansion Considering the Energy Production Optimization in the Dam-Reservoir Coupled Systems on the Vistula River
PublicationIn this study, the thermal stabilization of a water resource together with an energy production optimization in the power plant of the dam–reservoir coupled system is conducted. This coupled dam system is designed to consist of a primary (Włocławek) and secondary (Siarzewo) dam due to the erosion control aspect. The other beneficial aspect of this coupled dam design is to have an additional power plant, with the aim of achieving...
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Intense and stable room-temperature photoluminescence from nanoporous vanadium oxide formed by in-ambient degradation of VI3 crystals
PublicationVanadium oxides have attracted research interest because their optoelectronic properties make them optically active with room-temperature photoluminescence (PL) emission, which, however, is not sufficiently intense for real applications. For this reason, many nanostructured vanadium oxides are currently fabricated through several precursors and different treatments to improve the PL efficiency and enhance the PL intensity. Herein,...
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Nanosized carbon black as synergist in PP/POE-MA/IFR system for simultaneously improving thermal, electrical and mechanical properties
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Structural, thermal and energetic characteristics of synthetic active carbons prepared on the basis of ion-exchange resin Amberlite IRC 84
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Thermal behavior of the highly luminescent poly(3-hydroxybutyrate):Eu(tta)3(H2O)2 red-emissive complex
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Thermal efficiency investigations on the self-ignition test engine fed with marine low sulfur diesel fuels
PublicationWithin the article an issues of implementing the new kinds of marine diesel fuels into ships’ operation was described taking into ac-count restrictions on the permissible sulphur content introduced by the International Maritime Organization. This is a new situation for ship owners and fuel producers, which forces the necessity to carry out laboratory research tests on especially adapted engine stands. How to elaborate the method...
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Significant Production of Thermal Energy in Partially Ionized Hyperbolic Tangent Material Based on Ternary Hybrid Nanomaterials
PublicationNanoparticles are frequently used to enhance the thermal performance of numerous materials. This study has many practical applications for activities that have to minimize losses of energy due to several impacts. This study investigates the inclusion of ternary hybrid nanoparticles in a partially ionized hyperbolic tangent liquid passed over a stretched melting surface. The fluid motion equation is presented by considering the...
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A Single Mutation in a Tunnel to the Active Site Changes the Mechanism and Kinetics of Product Release in Haloalkane Dehalogenase LinB*
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Folding kinetics of WW domains with the united residue force field for bridging microscopic motions and experimental measurements
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Titanium(IV) Oxide Modified with Activated Carbon and Ultrasounds for Caffeine Photodegradation: Adsorption Isotherm and Kinetics Study
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Crystal Structure, Hydration, and Two-Fold/Single-Fold Diffusion Kinetics in Proton-Conducting Ba0.9La0.1Zr0.25Sn0.25In0.5O3−a Oxide
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Sandwich-like mesoporous silica flakes for anticancer drug transport—Synthesis, characterization and kinetics release study
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Adsorption of cationic dyes onto Fe@graphite core–shell magnetic nanocomposite: Equilibrium, kinetics and thermodynamics
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Ammonium removal from aqueous solution by natural zeolite, Transcarpathian mordenite, kinetics, equilibrium and column tests.
PublicationOpisano wyniki badań procesu usuwania jonów amonowych z wodnych roztworów modelowych z wykorzystaniem mordenitu-naturalnego zeolitu (w postaci surowej i po odpowiedniej wstępnej obróbce) zarówno w warunkach statycznych jak i dynamicznych. Oszacowano pojemność jonowymienną w stosunku do jonów amonowych (1,64 meq/g) w przypadku, gdy stężenie początkowe analitu było na poziomie 1000 mg/l. Sprawdzono również wpływ na przebieg procesu...
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The effect of sludge thermal disintegration on quality of effluents
PublicationDezintegracja osadów ściekowych prowadzona jest w celach intensyfikacji procesu fermentacji metanowej oraz poprawy odwadnialności osadów ściekowych. Przedstawiono zmiany jakości cieczy nadosadowej osadów ściekowych poddanych procesowi termicznej dezintegracji. Określono zmiany wartości chemicznego zapotrzebowania na tlen oraz stężenia azotu amonowego, białka, fosforanów oraz lotnych kwasów tłuszczowych.
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Thermal analysis of bis(tetraethylammonium) tetrachloroferrate(II)
PublicationBadano dekompozycję termiczną związków bis(tetraethylammonium) tetrachloroferrate(II). Stosowano następujące metody badawcze: TG-FTIR, TG-MS i DTA. Pomiary przeprowadzono w atmosferze obojętnej w zakresie temperatur od 293 K do 1073 K. Stałe produkty dekompozycji identyfikowano metodą spektroskopii w podczerwieni, spektroskopii Mössbauera oraz metodą dyfrakcji promieniowania rentgenowskiego. Przedyskutowano wpływ stopnia utlenienia...
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PVT - hybrid photovoltaic - thermal solar systems
PublicationPVT - to urządzenia, łączące ze sobą funkcje modułu fotowoltaicznego i kolektora słonecznego, w którym rolę absorbera pełni moduł ogniw fotowoltaicznych. Umożliwia to otrzymywanie z tej samej powierzchni pokrycia dachu lub fasady budynku uzyskiwanie jednocześnie energii elektrycznej i cieplnej. Uzyskiwane ciepło jest ciepłem niskotemperaturowym. Poszczególne rozwiązania systemów PVT można scharakteryzować ze względu na: różną liczbę...
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Thermal-Humidity Parameters of 3D Printed Wall
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Impact of the medical clothing on the thermal stress of surgeons
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Thermal and calorimetric investigations of titania–silica composites
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Intelligent thermal imaging camera with network interface
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Performance Analysis of A Photovoltaic-Thermal Integrated System
PublicationW artykule przedstawiono analizę energetyczną i egzergetyczną układu zintegrowanego PV/T. Straty egzergii występują zawsze w układach, w których procesy zachodzą ze zmianą temperatury i są proporcjonalne do wzrostu entropii systemu. Analiza egzergetyczna pozwala zlokalizować miejsce, wielkość i źródło termodynamicznej nieefektywności i ta informacja, trudna do pozyskania w inny sposób (np. przez analizę energetyczną) jest przydatna...
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Magneto-thermal convection of low concentration nanofluids
PublicationThe main aim of this paper was to analyze possible utilization of the low concentration nanofluids and the magnetic field to enhance heat transfer. The studied fluids were based on water with an addition of copper particles (40-60 nm diameter). They belonged to the diamagnetic group of materials. As a first attempt to stated target the analysis of enclosure placed in the maximal value of square magnetic induction gradient was carried...
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Photoinduced and thermal oxidation of rapeseed and sunflower oils
PublicationCelem prezentowanych badań było porównanie stabilności oksydatywnej olejów rzepakowych i słonecznikowych. Na etapie przyspieszania utleniania zastosowano promieniowanie UV. Po naświetlaniu lotne produkty utlenienia były izolowane z fazy nadpowierzchniowej przy pomocy mikroekstrakcji do fazy stacjonarnej HS-SPME(włókno DVB/CAR/PDMS) i oznaczane z zastosowaniem chromatografii gazowej z detektorem płomieniowo-jonizacyjnym (GC/FID)....
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Style Transfer for Detecting Vehicles with Thermal Camera
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Thermal stability of expanded perlite modified by mullite
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Thermal decomposition of acrylic pressure-sensitive adhesives
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The dynamic thermal properties of aerogel-incorporated concretes
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Thermal lenses caused by any acoustic source.
PublicationNieliniowe straty energii fali akustycznej doprowadzają do powstania obszarów ogrzanych, to znaczy obszarów o innej prędkości fali akustycznej niż pozostała przestrzeń. Soczewki termiczne wywoływane przez propagację fal akustycznych okresowych i nieokresowych są rozpatrywane. Przedstawiono ilustrację obliczeń numerycznych.
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Thermal stability of the cobalt base clad layers
PublicationBadano wpływ długotrwałego oddziaływania temperatury na mikrostrukturę i własności mechaniczne warstw napawanych laserowo wykonanych ze stopów na bazie kobaltu zawierających chrom i wolfram. Stopy te są przewidywane do zastosoania na przylgnie zaworów wydechowych silników diesla.
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Multilayer thermal model of healty and burned skin
PublicationW pracy przedstawiono spójny model cieplny skóry wraz z tkankami podskórnymi, na podstawie pomiarów "in vitro" na świni domowej. Model uwzględnia rozkład temperatury, przewodności cieplnej oraz efuzyjności i dyfuzyjności cieplnej w funkcji głębokości, zarówno dla skóry zdrowej jak i oparzonej.
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The solvent-free thermal dehydration of hexitols on zeolites
PublicationPodczas termicznej dehydratacji heksytoli w obecności zeolitów otrzymano szereg produktów zachodzących zarówno z inwersją lub retencją konfiguracji przy asymetrycznych atomach węgla. Produkty rozdzielano i identyfikowano przy pomocy chromatografii i spektroskopii NMR. 1,4:3,6-dianhydroiditol scharakteryzowano przy pomocy rentgenowskiej analizy strukturalnej.
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Thermal ablation modeling via bioheat equation
PublicationWe consider Pennes’ bioheat equation and discuss an implicit numerical scheme which has better stability properties than other approaches. Our discussion concerns Carthesian geometry problems, however it carries over to spherical geometry models and more complicated shapes.
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Mechanistic insights into the reactive radicals-assisted degradation of sulfamethoxazole via calcium peroxide activation by manganese-incorporated iron oxide–graphene nanocomposite: Formation of radicals and degradation pathway
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The use of thermal imaging camera to estimate velocity profiles based on temperature distribution in a free convection boundary layer
PublicationThis work describes an attempt to assess whether the temperature field from a thermal imaging camera can be converted into a velocity field with an accuracy sufficient for qualitative conducting or describing the phenomenon, i.e. when the Navier-Stokes, Fourier-Kirchhoff and continuity equations are mutually coupled. The consequence of this link between temperature fields and velocity is the possibility to formulate the hypothesis...
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Chemical structure, thermal and mechanical characterization of bio-based polyurethane composites filled with microcrystalline cellulose
PublicationOver the past several decades, the interest in replacing the synthetic components used in the production of polymers and composites with their natural counteparts has been growing. Biocomposites belong to the group of materials produced with the use of renewable raw materials. There has been a recent surge of interest in the industrial applications of composites containing natural fibres reinforced with biopolymers. Biopolymers...
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Mathematical modeling and prediction of pit to crack transition under cyclic thermal load using artificial neural network
PublicationThe formation of pitting is a major problem in most metals, which is caused by extremely localized corrosion that creates small holes in metal and subsequently, it changes into cracks under mechanical load, thermo-mechanical stress, and corrosion process factors. This research aims to study pit to crack transition phenomenon of steel boiler heat tubes under cyclic thermal load, and mathematical modeling...
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Effect of bio-based components on the chemical structure, thermal stability and mechanical properties of green thermoplastic polyurethane elastomers
PublicationIt seems to be obvious that conditions changes during polyols synthesis have impact on the polyols properties. Even the chemical formula is the same or similar, physicochemical properties and also molecular weight of polyols might be different and are significant in term of future polyurethanes properties and processing. In this work, fully bio-based poly(propylene succinate)s synthesized at different temperature conditions were...
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Influence of Boron Carbide on Core Degradation During Severe Accidents in LWRs
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The influence of implantation on mechanical degradation of the nanotubular oxide layer on titanium screws
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Enzymatic degradation and transport of endothiopeptides into Escherichia coli K12 mutant strains
PublicationZbadano transport trzech otrzymanych na drodze syntezy ditiopeptydów do komórek Escherichia coli K12. Ponadto zbadano szybkość hydrolizy tych związków. Wszystkie peptydy są transportowane przez permeazy, natomiast są bardziej oporne na hydrolizę enzymatyczną w stosunku do naturalnych peptydów.