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Wyświetlanie 1-15 z 232
Tytuł:
Comparison of experimental and modelling results of thermal properties in Cu-AlN composite materials
Autorzy:
Chmielewski, M.
Weglewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/202249.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal properties
porosity
copper-based composites
Opis:
Copper-based composites could be widely used in automotive, electronic or electrical industry due to their very promising thermal properties. In the present paper, Cu-AlN metal matrix composites with ceramic volume fractions between 0.1 and 0.4 were fabricated by hot pressing method in vacuum. Dependence of the coefficient of thermal expansion (CTE) and the thermal conductivity (TC) on the chemical composition of composites has been investigated. The measured values of the thermal expansion coefficient have been compared with the analytical models’ predictions. A numerical model based on FEAP 7.5 in 3D space has been used to evaluate the influence of the porosity on the thermal properties (thermal conductivity) of the composite. A fairly good correlation between the FEM results and the experimental measurements has been obtained.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 507-514
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and thermal properties of nanocomposites based on polyolefins and montmorillonite modified with ethyl 2-aminobenzoate
Autorzy:
Olewnik-Kruszkowska, E.
Chrzanowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/102599.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
nanocomposites
thermal properties
polyolefins
TGA
XRD
Opis:
Our efforts were focused on improving thermal stability of polyethylene (PE) and polypropylene (PP) through incorporation of new organically modified montmorillonite.The reactive organofilic montmorillonite (MMT-EA) was prepared by exchanging the interlayer inorganic cations in montmorillonite by a large excess of ethyl 2-aminobenzoate (EA). Organic modification can affect not only microstructures, but also the properties of the polymer - montmorillonite nanocomposites. In the next step, novel polyolefins/ organoclay nanocomposites were prepared by melt intercalation process. In order to obtain this new family of materials and enhance their properties very low filler level, from 1.5 to 5 wt.% was used.The dispersion of the montmorillonite layers in the polymers was characterized by using X-ray diffraction (XRD). The thermal properties and structure changes were studied by different scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Further studies indicated that the exfoliated clay modified with EA improved thermal stability of the PE and PP/MMT-EA nanocomposites.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 233-239
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal properties of nanoliquids in the aspects of their used in the insulation system of high voltage power transformer
Autorzy:
Dombek, G.
Nadolny, Z.
Przybyłek, P
Powiązania:
https://bibliotekanauki.pl/articles/97610.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
nanoliquids
high voltage power transformers
thermal properties
Opis:
The article presents information concerning the electrical and thermal properties of nanoliquids in the context of their use in the insulating system of high voltage power transformers. It consists of six chapters. The first chapter is an introduction. The second chapter describes properties of the modern insulating nanoliquids created on the basis of mineral oil and nanoparticles. The third chapter is devoted to the measurement systems to the measure of the viscosity, thermal conductivity and density. The fourth chapter presents the methods of preparation of nanoliquids. In the fifth chapter the viscosity, thermal conductivity and density of mineral oil and nanoliquids were compared. Article ends with a summary.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 217-226
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of the modelling and numerical simulation of the thermal properties of machine tools
Autorzy:
Jędrzejewski, J.
Kwaśny, W.
Kowal, Z.
Winiarski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/99438.pdf
Data publikacji:
2014
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
modelling
numerical analysis
thermal properties
Opis:
This paper highlights the need for the holistic modelling of the thermal properties of machine tools to provide a good basis for the effective aiding of machine tool design and optimization. A brief history of this modelling and the idea of accurate modelling and its experimental verification are presented. Examples of the holistic modelling of drive units both isolated from the machine tool and interconnected with its structure are provided.
Źródło:
Journal of Machine Engineering; 2014, 14, 3; 5-20
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Properties of Carbon Nanotube (CNT) Reinforced Polyvinyl Alcohol (PVA) Composites
Autorzy:
Hasan, M.
Das, S. K.
Islam, J. M. M.
Gafur, Md. A.
Hoque, E
Khan, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/411675.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CNT
PVA
composite
Thermal properties
Gum acacia
Opis:
Homogeneous Polyvinyl alcohol (PVA)/Carbon nanotube (CNT) composite has been prepared by solution casting method using gum acacia as a surfactant. CNT content in the composite was varied from 5-10 % by weight. The thermal properties of PVA/CNT composites were investigated by Thermo Gravimetric/Differential Thermal Analyzer (TG/DTA) and Thermo Mechanical Analyzer (TMA). TG/DTA results showed that higher thermal stability in higher percentage of CNT in the composites. The 10 % CNT containing PVA composite exhibit highest onset of melting, glass transition point and offset of melting temperature and the recoded values are 330.4K, 379K and 421.3K respectively. All of the result indicates that the developed PVA/CNT composite might be promising for use in solar cell application.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 12; 59-66
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of waste materials as fillers in polymer composites-synthesis and thermal properties
Autorzy:
Gargol, Mateusz
Podkościelna, Beata
Powiązania:
https://bibliotekanauki.pl/articles/109774.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
waste materials
composites
thermal properties
UV-polymerization
Opis:
This paper presents the synthesis and characterization of new polymeric materials in form of composites. As a fillers, waste materials of inorganic origin (ash and silica gel), were used. In the synthesis of composites, two derivatives of bisphenol A (glycerolate diacrylate, and epoxy resin, Epidian® 5), were applied. The compositions were prepared with an increasing amount of fillers 0-40% w/w in both tested systems. Composites were analyzed using the thermogravimetric analysis (TG/DTG), which showed the influence of different fillers on their thermal properties. Moreover, the proper course of the polymerization reaction was confirmed by spectroscopic analysis (ATR/FT-IR). It has been shown that new resistant materials can be obtained, using cheap and waste materials, by simple synthesis which does not require monitoring of the reaction course or expensive polymerization initiators.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1549-1556
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Thermal Properties of Europium-Cerium Oxide as a New Fluorite-Type Ceramic Material for Thermal Barrier Coatings Applications
Autorzy:
Mikuśkiewicz, M.
Stopyra, M.
Moskal, G.
Powiązania:
https://bibliotekanauki.pl/articles/352272.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TBC
cerium oxide
europium oxide
thermal properties
Opis:
In the present paper the structure and thermal properties of europium cerium oxides were investigated. The material for the research was obtained via solid state synthesis. The initial powders: ceria CeO2 and europia Eu2O3 were mixed in 1:1 mass ratio (non-stoichiometric proportion with the excess of CeO2) and milled. The sintering process was performed using high temperature vacuum press at 1350°C. Calorimetric analysis was conducted both for initial powders and milled mixture. The structure, phase composition and thermal diffusivity of obtained material were investigated in as-sintered condition. It was revealed that the obtained material was multi-phase. Non-stoichiometric phases including Ce0.5Eu0.5O1.75 with fluorite type structure and different lattice parameters were present. Thermal diffusivity decreased in the range from 25 to 900°C from 1.49 to 0.57 mm2 /s and then increased to 0.70 mm2 /s at 1400°C.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 2089-2093
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Potential of Sisal Fibre as an Additive in Lightweight Foamed Concrete for Thermal Properties Enhancement
Autorzy:
Mydin, Md Azree Othuman
Powiązania:
https://bibliotekanauki.pl/articles/2201770.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
foamed concrete
thermal properties
conductivity
diffusivity
specific heat
Opis:
Lightweight foamed concrete (LFC) is extremely permeable, and its thermal properties reduce with rising in the number of voids. In turn, to improve its thermal properties, the solid matrix of LFC can be adjusted by incorporating several natural fibers. The influence of sisal fiber in LFC was not investigated before in the current body of knowledge. Hence, there is some ambiguity considering the mechanism by which and the extent to which the sisal fiber can influence LFC thermal properties. Hence, this study concentrates on distinguishing the potential use of sisal fiber in LFC. The purpose of this research is to determine LFC's thermal characteristics when sisal fiber is added. Casting and testing of densities of 800 kg/m3 and 1600 kg/m3 were done. Various weight fractions were employed pertaining to sisal fiber, i.e., 0.15%, 0.30%, 0.45% and 0.60%. The components of thermal properties, which consist of specific heat, thermal conductivity as well as thermal diffusivity were evaluated. To get comparable results, we fixed the water to cement ratio as 0.45 while keeping constant the cement to sand ratio at 1:1.5. It was seen that optimum results were achieved with the addition of 0.45% of sisal fiber with regard to all the thermal characteristics regarded in this exploration. At 0.45% weight fraction about sisal fiber, maximum compaction was achieved with fibers as well as the cementitious matrix, which ensued in good mix uniformity. Beyond the optimum level pertaining to the presence of sisal fiber, it could be seen that fibers would agglomerate and exhibit non-uniform dispersion, which resulted in a decline with regards to the entire thermal characteristics assessed.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 89--97
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości mechaniczne i termiczne mieszanin poli(alkoholu winylowego) i elastyny
The mechanical and thermal properties of poly(vinyl alcohol)/elastin hydrolysates blends
Autorzy:
Skopińska-Wiśniewska, J.
Sionkowska, A.
Wieczorek, A.
Kozłowska, J.
Płanecka, A.
Powiązania:
https://bibliotekanauki.pl/articles/285948.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomateriały
właściwości mechaniczne
właściwości termiczne
biomaterials
mechanical properties
thermal properties
Źródło:
Engineering of Biomaterials; 2011, 14, no. 109-111 spec. iss.; 29-31
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of cocamidopropyl betaine on the mechanical and thermal properties of polymer films
Autorzy:
Stachowiak, Natalia
Kowalonek, Jolanta
Kozłowska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/1844961.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polymers
mechanical properties
thermal properties
polimery
właściwości mechaniczne
właściwości cieplne
Źródło:
Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 56
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical & Thermal Properties of Epoxy Based Hybrid Composites Reinforced with Jute / Sansevieria cylindrica Fibres
Autorzy:
Kumar, M. A.
Reddy, G. R.
Powiązania:
https://bibliotekanauki.pl/articles/411940.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
jute fiber
hybrid composites
mechanical properties
Sc fiber
thermal properties
Opis:
Tensile properties are studied to assess the influence of fiber weight. Room temperature cured epoxy was impregnated with jute/Sc in order to evaluate the performance of hybrid composites. Jute/Sc fibers are taken in the 1:1 weight ratios to suspend on epoxy resin with different fiber lengths such as 1, 2, 3 and 4 cm. The variations of aforementioned properties on hybrid composites with different fiber lengths have been studied. Significant improvement in tensile strengths of the jute/Sc hybrid composites has been observed by the alkali treatments. Thermal properties such as TGA and DSC are studied to investigate the influence of change in fibre length on treated and untreated hybrid composites in which 4 °C rise in decomposition temperature, 3 °C rise for glass transition temperature respectively.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 2; 191-197
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and thermal properties of commercial multilayer flexible plastic packaging materials irradiated with electron beam
Autorzy:
Oliveira, V. M.
Nogueira, B. R.
Ortiz, A. V.
Moura, E. A. B.
Powiązania:
https://bibliotekanauki.pl/articles/146772.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron-beam radiation
multilayer packaging materials
mechanical properties
thermal properties
Opis:
The effects of electron-beam irradiation on mechanical and thermal properties were studied for two commercial multilayer structures of flexible food packaging. Both the laminated poly(ethylene terephthalate) (PET)/ low-density polyethylene (LDPE) and the coextruded LDPE/polyamide(PA)/LDPE structures were irradiated up to 120 kGy using a 1.5 MeV electron beam accelerator, at room temperature in the presence of air. Mechanical properties showed significant changes (p < 0.05), specially in sealability that was severely affected. Changes in mechanical properties were discussed in relation to the eight day and the six month period after irradiation. In addition, the DSC analysis six months after treatment showed that the fusion enthalpy of the PET/LDPE structure components increase for the LDPE from 10 kGy and decrease for the PET up to 120 kGy (p < 0.05). On the other hand, the LDPE/PA6/ LDPE presented increase in the LDPE and PA up to 120 kGy, except for LDPE at 10 and 15 kGy and PA at 5 kGy doses (p < 0.05). The effects of irradiation were less severe for the LDPE/PA6/LDPE than for the PET/LDPE. The electron-beam irradiation did not show advantageous results that could be of interest for commercial applications for the film industry, but brings important information about the packaging behavior for food producers who may decide to use irradiation as a form of cold pasteurization of their packed products.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 141-144
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Designing a Highly Energetic PCL-GAP-PCL-based PU Elastomer; Investigation of the Effect of Plasticizers on Its Properties
Autorzy:
Chizari, Mostafa
Bayat, Yadollah
Powiązania:
https://bibliotekanauki.pl/articles/358502.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
polyurethane elastomer
glycidylazide polymer
binder
energetic plasticizer
mechanical properties
thermal properties
Opis:
Glycidylazide polymer (GAP) has potential interest for the development of high-performance energetic propellants. Although GAP is a well-known and promising energetic polymer, propellants based on it suffer from poor mechanical and low-temperature properties. In order to improve the mechanical and thermal properties of GAP a promising idea would be the preparation of a tri-block copolymer of it with a polymer having good mechanical and thermal properties, such as polycaprolactone (PCL). In this work, we report a detailed investigation of the glass transition temperature (Tg) and viscosity of PCL-GAP-PCL samples incorporated with energetic plasticizers, BuNENA, TMETN, and BTTN. The results demonstrated that the Tg of PCL-GAP-PCL is influenced by the type of plasticizer. PCL-GAP-PCL was cured with TDI and a mixed curing system (IPDI/N100). The elastomer prepared with the mixing curing system showed excellent mechanical properties with 2.64 MPa and 138% elongation. The effects of the energetic plasticizers on the mechanical properties of the elastomer were investigated. Finally, the plasticized tri-block copolymer showed enhanced mechanical and thermal properties.
Źródło:
Central European Journal of Energetic Materials; 2019, 16, 1; 33-48
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of HNT on mechanical and thermal properties of polylactic acid/polypropylene carbonate blends
Wpływ HNT na właściwości mechaniczne i termiczne mieszaniny polikwas mlekowy/węglan polipropylenu
Autorzy:
Haneef, Intan Najwa Humaira Mohamed
Buys, Yose Fachmi
Shaffiar, Norhashimah Mohd
Shaharuddin, Sharifah Imihezri Syed
Hamid, Abdul Malek Abdul
Sabri, Mohd Faizul Mohd
Afifi, Amalina Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2088248.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
PLA
PPC
HNT
mechanical properties
thermal properties
właściwości mechaniczne
właściwości termiczne
Opis:
In this work, the influence of halloysite nanotubes (HNTs) on the mechanical and thermal properties of the polylactic acid/polypropylene carbonate (PLA/PPC 70/30) blend was studied. The HNT was incorporated into the PLA/PPC blend by melt mixing. It was found that addition of 2-6 wt % HNT successfully improved the tensile and flexural strength as well as the flexural and Young’s moduli of PLA/PPC blend, due to the reinforcing effect. Although the elongation at break decreases with increasing HNT content, its value is much higher than that of pure PLA. Moreover, the addition of HNT did not affect the miscibility of PLA and PPC, since two glass transition temperatures were observed in the DSC thermograms. However, a higher content of HNT may improve the compatibility between PLA and PPC as evidenced by the lower difference between the glass transition temperature of PPC and PLA and reduced crystallinity resulting in higher tensile strength of nanocomposites.
W pracy zbadano wpływ nanorurek haloizytowych (HNTs) na właściwości mechaniczne i termiczne mieszaniny polikwas mlekowy/węglan polipropylenu (PLA/PPC 70/30). HNT wprowadzono do PLA/PPC poprzez mieszanie w stanie stopionym. Stwierdzono, że dodatek 2-6% mas. HNT skutecznie poprawił wytrzymałość na rozciąganie i zginanie, a także moduł sprężystości przy zginaniu i moduł Younga mieszaniny PLA/PPC, jako efekt wzmacniający. Pomimo, że wydłużenie przy zerwaniu zmniejsza się wraz ze wzrostem zawartości HNT, to jego wartość jest znacznie większa niż w przypadku czystego PLA. Nie stwierdzono wpływu HNT na mieszalność PLA i PPC, ponieważ na termogramach DSC zaobserwowano dwie temperatury zeszklenia. Jednak większa zawartość HNT może poprawić mieszalność PLA i PPC, o czym świadczy mniejsza różnica między temperaturą zeszklenia PPC i PLA oraz mniejszy stopień krystaliczności, co skutkuje wiekszą wytrzymałościa na rozciaganie nanokompozytów.
Źródło:
Polimery; 2021, 66, 9; 459--465
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Genetic Algorithm to Determine Thermal Properties of Microelectronic Layered Structures
Autorzy:
Arsoba, R.
Suszyński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/92932.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
genetic algorithm
inverse problem
microelectronics
thermal properties
layered structure
Opis:
In the paper, possibilities of application of genetic algorithms to determine thermal properties depth profile in microelectronic layered structures were presented. A developed computational method was described and results obtained using the method for a thyristor structure were presented.
Źródło:
Studia Informatica : systems and information technology; 2008, 1(10); 15-26
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 232

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