Wyniki wyszukiwania dla: thermal energy
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Spectroscopic, thermal and equilibrium characterization of U(VI) ions sorption on inulin in the presence of phosphates
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The effect of lithium fluoride on the thermal stability and thermoluminescence properties of borosilicate glass and glass-ceramics
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Influence of modes of thermal hardening and the subsequent cryogenic processing on structure and properties of steel 38Ni3CrMoV
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TG-FTIR, DSC and quantum chemical studies of the thermal decomposition of quaternary methylammonium halides
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Synergistic effect of activated carbon and Ni2O3 in promoting the thermal stability and flame retardancy of polypropylene
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Analysis of transient thermal processes for improved visualization of breast cancer using IR imaging.
PublikacjaPrzedstawiono analizę możliwości i ograniczeń metod termograficznych w diagnostyce nowotworów piersi. Przeanalizowane termiczne modele numeryczne piersi z nowotworem pokazują, iż zastosowanie nowej metody aktywnej termografii dynamicznej z termicznym wymuszeniem zewnętrznym, może znacząco poprawić skuteczność wykrywania nowotworów piersi we wczesnym stadium ich rozwoju . Pokazano również wyniki badania klinicznego pacjentki...
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Study of thermal property changes of biopol/polyamide 11 blends during biodegradation in compost.
PublikacjaPrzeprowadzone badania dotyczą zmian struktury krystalicznej podczas biodegradacji mieszanin polimerowych z udziałem PHBV, gdzie zależność między strukturą a podatnością na biodegradację związane są nie tylko ze stopniem krystaliczności PHBV ale także z budową faz składników mieszaniny. Wyniki pozwalają stwierdzić, że mieszaniny PA11/PHBV zawierające 60% kopoliestru PHBV(otrzymane przy użyciu wytłaczarki dwuślimakowej) charakteryzują...
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Compensation of thermal deformations as a method of improving performance of large tiling pad thrust bearings.
PublikacjaTermiczne odkształcenia klocków łożyskowych wywierają niekorzystny wpływ na właściwości łozysk o dużych średnicach. W pracy przedstawiono przegląd znanych z techniki sposobów ograniczania odkształceń termicznych.Na podstawie wyników własnych badań szczegółowo omówiono efekty kompensacji odkształceń w dwóch przykładowych rozwiązaniach konstrukcyjnych: łożysku z klockami podpartymi na sprężynach śrubowych i z klockami podpartymi...
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Application of artificial neural networks (ANN) as multiple degradation classifiers in thermal and flow diagnostics
PublikacjaPrzedyskutowano problem zwiększenia dokładności rozpoznawania wielokrotnych degradacji eksploatacyjnych urządzeń składowych dużych obiektów energetycznych. Zastosowani sieć neuronową (SSN) o skokowych funkcjach przejścia. Sprawdzono możliwości przyspieszenia treningu sieci neuronowych. Zastosowano modułową metodę budowy SSN, polegającą na dedykowaniu pojedynczej sieci do rozpoznawania tylko jednego typu degradacji.
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Thermal analysis of manganese(II) complexes of general formula (Bu4N)2[MnBrnCl4−n]
PublikacjaBadano termiczną dekompozycję związków zawierających aniony tetrahalogenomanganese(II), [MnBrnCl4−n]2−(n = 0-4) i kationy tetrabutylammonium. Stosowane metody to: DSC, TG-FTIR, TG-MS i DTA. Pomiary prowadzono w argonie i powietrzu w zakresie temperatur 173-450K (DSC) i 300-1073K (TG). Stałe produkty dekompozycji identyfikowano metodami spektroskopii FT-FIR i dyfraktometrii rentgenowskiej.
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Influence of mechanochemical treatment on thermal and structural properties of silica–collagen and hydroxyapatite–collagen composites
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Sensitivity of personalized ventilation air terminal device geometry with regard to a human thermal sensation
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Characteristics of thermal behavior of photoluminescent copolymers studied by the TG/DTG/FTIR coupled method
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Thermal decomposition of [Cd{SSi(OBut)3}(S2CNC4H8)]2 to CdS “micro-noodles”
PublikacjaThis work presents studies on thermal degradation of novel heteroleptic complex possessing mixed S-donor ligands, [Cd{SSi(OBut)3}(S2CNC4H8)]2 using TGA, DSC, TGA-IR, SEM and XRD methods.
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Effect of ground tire rubber on structural, mechanical and thermal properties of flexible polyurethane foams
PublikacjaFlexible polyurethane foams were modified with two kinds of ground tire rubber, untreated and thermo-mechanically reclaimed. A reclamation process was performed in auto-thermal conditions, which reduced the cost of the process and decreased the environmental impact of devulcanization (e.g., emission of gases). The reclamation process was carried out in a continuous manner using a co-rotating twin screw extruder. The foams were...
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Rigid polyurethane foams modified with ground tire rubber - mechanical, morphological and thermal studies
PublikacjaRigid polyurethane foams, prepared by a single step method, were modified with the two types of ground tire rubber particles, i.e. untreated and thermo-mechanically reclaimed by using a co-rotating twin screw extruder. The foaming process as well as the structure and the physical, mechanical and thermal properties of the resulting foams were investigated. The presence of ground tire rubber decreased the velocity of polymerization....
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Morphology and the physical and thermal properties of thermoplastic polyurethane reinforced with thermally reduced graphene oxide
PublikacjaIn this study, thermally reduced graphene oxide (TRG)-containing polyurethane nanocomposites were obtained by the extrusion method. The content of TRG incorporated into polyurethane elastomer systems equaled 0.5, 1.0, 2.0 and 3.0 wt%. The morphology, static and dynamic mechanical properties, and thermal stability of the modified materials were investigated. The application of TRG resulted in a visible increase in material stiffness...
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Impact of thermal backfill parameters on current-carrying capacity of power cables installed in the ground
PublikacjaProper design of power installations with the participation of power cables buried in homogeneous and thermally well-conductive ground does not constitute a major problem. The situation changes when the ground is non-homogeneous and thermally low-conductive. In such a situation, a thermal backfill near the cables is commonly used. The optimization of thermal backfill parameters to achieve the highest possible current-carrying capacity...
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Unusual dynamics and nonlinear thermal self-focusing of initially focused magnetoacoustic beams in a plasma
PublikacjaUnusual thermal self-focusing of two-dimensional beams in plasma which axis is parallel to the equilibrium straight magnetic field is considered. The equi- librium parameters of plasma determine scenario of a beam divergence (usual or unusual) which is stronger as compared with a flow without magnetic field. Nonlinear thermal self-action of a magnetosonic beam behaves differently in the ordinary and unusual cases. Damping of wave...
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Thermal analysis of manganese(II) complexes of general formula(Et4N)2[MnBrnCl4−n]
PublikacjaBadano termiczną dekompozycję związków zawierających aniony [MnBrnCl4−n]2− (n = 0-4) i kation tetraetylammonium. Wykorzystywano metody DSC i TG. Badania prowadzono w atmosferze argonu w temperaturze 173-500K (DSC)i 300-1073K (TG). Produkty dekompozycji określono za pomocą MS, FTIR, Far-FTIR i dyfraktometrii rentgenowskiej.
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Thermal analysis of copper(II) complexes of general formula [Et4N]2[CuBrnCl4-n]
PublikacjaBadano dekompozycję termiczną związków składających sie z anionów: [CuBrnCl4-n]2- (n=0-4) i kationów tetrametyloamoniowych. Stosowano następujące metody badawcze: TG-FTIR, TG-MS, DTA i DTG. Pomiary przeprowadzono w atmosferze argonu i powietrza w zakresie temperatur od 293 K do 1073 K. Produkty dekompozycji identyfikowano metoda spektroskopii w podczerwieni (IR i FIR) oraz metodą dyfrakcji promieniowania rentgenowskiego.
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Effect of glycols used as glycolysis agents on chemical structure and thermal stability of produced glycolysates
PublikacjaZaprezentowano warunki glikolizy poliuretanowych odpadów piankowych, przy użyciu różnych glikoli oraz wyniki badań budowy chemicznej glikolizatów oraz ich właściwości termicznych.
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Cyclic analysis of thermal impedance of a passive layer of aluminium in a neutral borate buffer solution
PublikacjaW pracy przedstawiono wyniki badań warstwy pasywnej tworzącej się na stopie 1050 A w warunkach zmieniającej się temperatury. Zmiany realizowano w sposób cykliczny zwiększając a następnie zmniejszając temperaturę. W czasie zmian temperatury prowadzono badania metodę dynamicznej elektrochemicznej spektroskopii impedancyjnej. Stwierdzono największe zmiany parametrów elektrycznego schematu zastępczego w czasie pierwszego cyklu zmian....
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Multivariate analysis of seasonal variation in the composition and thermal properties of butterfat with an emphasis on authenticity assessment
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Burn depths evaluation based on active dynamic IR thermal imaging - A preliminary study
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Possibility of exact determination of thermal and flow degradation symptoms in on-line power objects diagnostics
PublikacjaPrzedyskutowano problem dokładności tworzenia symptomów degradacji dotyczących sprawności urządzeń składowych dużych obiektów energetycznych. W referacie zajęto się szczególnie metodami tworzenia wzorców sprawnej pracy w przypadku określania sprawności w układzie on-line i porównano ją z określeniem w systemie off-line. Do odtwarzania stanu referencyjnego zastosowano sieć neuronową statystyczną (SSN, ang. ANN) o nieskokowych funkcjach...
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Thermal Barrier Coatings for High-Temperature Performance of Nickel-Based Superalloys: A Synthetic Review
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Modification of microporous polyurethane elastomers with different types of ash—morphological, mechanical, and thermal studies
PublikacjaIncorporation of wood ash particles from wood gasification into microporous polyurethane elastomers has been investigated and compared to addition of commercially available microspheres resulting from coal burning. Samples were modified with 3 and 6 wt% of fillers. Structure, mechanical, and thermal properties of obtained elastomers were investigated. Incorporation of both types of ash particles decreased the density of polyurethanes...
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Implementation of the Boundary Element Method to Two-Dimensional Heat Transfer with Thermal Bridge Effects
PublikacjaThe work presents an application of the boundary element method applied to a two-dimensional conductive heat transfer. The algorithm of the method is explained and its advantages are outlined. Green's function as a fundamental solution for Poisson's equation in two dimensions was used and the direct approach was applied. The presented results concern building construction elements as typical cases of thermal bridges. Some properties...
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Thermal self-action effects for acoustic beams containing fronts in a Maxwell relaxing fluid
PublikacjaThis paper examines the thermal self-action of acoustic beams in a Maxwell relaxing fluid. This type of thermal self-action differs from that in a Newtonian fluid and behaves differently depending on a ratio of sound period and time of thermodynamic relaxation. The self-action which relates to sound beams containing shock fronts is also discussed. In addition, stationary and non-stationary types of self-action are considered.
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Interaction of Acoustic and Thermal Modes in the Gas with Nonequilibrium Chemical Reactions: Possibilities of Acoustic Cooling
PublikacjaNonlinear generation of thermal mode during propagation of dominative sound in a chemically reacting gas is considered. The dynamic equation of excess temperature associated with the thermal mode is derived. It is instantaneous and includes quadratic nonlinear acoustic source reflecting the nonlinear character of interaction between acoustic and non-acoustic types of gas motion. Both periodic and aperiodic sound may be considered...
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The Influence of Laser Surface Alloying on the Thermal Fatigue Resistance of Hot Work Tool Steels
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Evaluation of Influence of the Addition Nanofillers on the Mechanical and Thermal Properties Terpolymers Ester-Ether-Amide
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Thermal Self-Action Effects of Acoustic Beam in a Gas with Reversible or Irreversible Chemical Reaction
PublikacjaThermal self-action of acoustic beam in a gas where an exothermic chemical reaction takes place, is studied. This kind of thermal self-action differs from that in a newtonian fluid. In dependence on the type of a chemical reaction, reversible or not, heating or cooling of a medium occurs. A beam in the case of the irreversible reaction may be unusually self-focusing. The self-action effects relating to wave beams containing shock...
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Intensification of thermal convection near electric devices using flat screens – computer modelling
PublikacjaIntensification of natural thermal convection near electric devices is possible by application of additional elements as screens creating convection canals close to the device. In the earlier authors paper the results of the analysis of thermal convection with the use of only one additional screen close to the electric device were presented. This paper presents computer modelling of thermal convection when two screens near the...
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Foamed Polyurethane Composites With Different Types of Ash – Morphological, Mechanical and Thermal Behavior Assessments
Publikacjancorporation of two types of ash particles into flexible polyurethane foams has been investigated, wood ash from gasification process and fly ash resulting from coal burning in power plant. Samples were modified with 5, 10 and 15 wt% of fillers. Structure, mechanical and thermal properties of obtained foams were investigated. Incorporation of both types of ash particles resulted in materials showing...
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Thermal Imaging Aided Assessment of a State of Equipment Under Test and its Protecting Elements
PublikacjaIn the paper the investigation results using thermal imaging methods are presented. The examined is a state of equipment under test and its protecting components. The estimations are done for the chosen protecting elements during surge immunity testing. The results show that the thermal imaging methods are useful for early detection of possible damage of a device being tested
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Thermal stabilization and permanent deformation resistance of LWA/PCM-modified asphalt road surfaces
PublikacjaThis paper presents the results of attempts at reducing the problem of solar overheating of asphalt road pavement surfaces, resulting in weakening and accelerated destruction of the aforementioned structures. To protect pavement surfaces against periodic overheating, standard asphalt mixture AC 16 W 35/50, used for binder course, has been modified by replacing one of the aggregate fractions from the mineral mixture with lightweight...
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Analysis of the Heating Process of Hydraulic Motors during Start-Up in Thermal Shock Conditions
PublikacjaConditions that prevail during harsh winters and hot summers pose a serious challenge for machine designers building devices suitable for operation in extreme weather. It is essential for the designers and the users to define the principles and conditions for the safe operation of machines and devices with hydraulic drive in low ambient temperatures. Bearing in mind the above, the author tested the hydraulic motors in thermal shock...
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Inverse determination of sliding surface temperature based on measurements by thermocouples with account of their thermal inertia
PublikacjaThis study developed an inverse heat conduction algorithm to determine temperature at a sliding surface taking account of thermocouple thermal inertia. The direct heat conduction problem was solved analytically based on the Laplace integral transform approach. The inverse algorithm was applied to the problem of friction of a brake material against a steel. The experiments were conducted on a pin-on-disc tribometer for three short-time...
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Mechanical, Thermal and Rheological Properties of Polyethylene-Based Composites Filled with Micrometric Aluminum Powder
PublikacjaInvestigations related to polymer/metal composites are often limited to the analysis of the electrical and thermal conductivity of the materials. The presented study aims to analyze the impact of aluminum (Al) filler content (from 1 to 20 wt%) on the rarely investigated properties of composites based on the high-density polyethylene (HDPE) matrix. The crystalline structure, rheological (melt flow index and oscillatory rheometry),...
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A Comparison of Empirical Correlations of Viscosity and Thermal Conductivity of Water-Ethylene Glycol-Al2O3 Nanofluids
PublikacjaBecause of their superb thermal conductivity, nanofluids are seen as new generation of cooling mediums in many engineering applications. It is well established that even a small amount of nanoparticles mixed with a base fluid may result in distinct thermal conductivity enhancement. On the other hand, addition of nanoparticles to the base fluid results in its substantial viscosity increase. Therefore, it is very dicult to evaluate...
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Thermal and Hydrodynamic Phenomena in the Stagnation Zone — Impact of the Inlet Turbulence Characteristics on the Numerical Analyses
PublikacjaOne of the methods of heat transfer enhancement is utilization of the turbulent impinging jets, which were recently applied, for example, in the heat exchangers. Their positive impact on the heat transfer performance was proven, but many questions related to the origin of this impact are still unanswered. In general, the wall-jet interaction and the near-wall turbulence are supposed to be its main reason, but their accurate numerical...
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The luminescence study ofNaK2Li[Li3SiO4]4:Eu coumpounds.
Dane BadawczeNarrowband green phosphors with high quantum efficiency are required for backlighting white light-emitting diode (WLED) devices. Materials from the A[Li3SiO4]4:Eu2+ family have recently been proposed as having superior properties to industry-standard β-SiAlON green phosphors. Here, we show that a cheap, easily synthesized host NaK2Li[Li3SiO4]4 (NKLLSO)...
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The Possibility to use a Nuclear Power Plant as a Source of Electrical Energy and Heat
PublikacjaIn this article issues concernig the possibility of nuclear power plant (NPP) operation also as a source of heat, which means combined heat and power production, have been described. CHP work is possible and profitable only in those areas where high thermal power demand occurs, which means near city agglomerations such as Warsaw or the Tri-City. Two levels of thermal power delivered to the heating system have been considered. Preliminary...
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Numerical analysis of high temperature minichannels heat exchanger performance
PublikacjaNowadays, the most difficult technological challenge in energy sector is connected with the gas micro-CHP units, dedicated to the distributed power generation. They are expected to be of high efficiency and at the same time of compact in size. Regarding the first reason, significant increase in microturbine efficiency can only be achieved by increase in the engine operating temperature. Therefore, one of the critical elements in...
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The use of recycled semiconductor material in crystalline silicon photovoltaic modules production - A life cycle assessment of environmental impacts
PublikacjaTo offset the negative impact of photovoltaic modules on the environment, it is necessary to introduce a longterm strategy that includes a complete lifecycle assessment of all system components from the production phase through installation and operation to disposal. Recycling of waste products and worn-out systems is an important element of this strategy. As the conclusions from the previous studies have shown, thermal treatment...
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Effect of carbazole and pyrrolidine functionalization of phenanthroline ligand on ground- and excited-state properties of rhenium(I) complexes. Interplay between 3MLCT and 3IL/3ILCT
PublikacjaNew rhenium(I) tricarbonyl complexes based on the phenanthroline ligand were designed and synthesized to investigate the role of carbazole (cbz) and pyrrolidine (pyrr) substituents in determining thermal, electrochemical and optoelectronic properties. Both pyrr and cbz are electron-releasing substituents, but they differ in the steric hindrance and electron delocalization ability. The impact of pyrr and cbz on ground- and excited-state...
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Quantumness in Diagnostics of Marine Internal Combustion Engines and Other Ship Power Plant Machines
PublikacjaThe article provides proof that the diagnostics of marine internal combustion engines and other ship power plant machines should take into account the randomness and unpredictability of certain events, such as wear, damage, the variations of mechanical and thermal loads, etc., which take place during machine operation. In the article, the energy E, like the other forms (methods) that it can be converted into (heat and work), is...
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Predicting Performance of Lightweight Concrete with Granulated Expanded Glass and Ash Aggregate by Means of Using Artificial Neural Networks
PublikacjaLightweight concrete (LWC) is a group of cement composites of the defined physical, mechanical, and chemical performance. The methods of designing the composition of LWC with the assumed density and compressive strength are used most commonly. The purpose of using LWC is the reduction of the structure’s weight, as well as the reduction of thermal conductivity index. The highest possible strength, durability and low thermal conductivity...