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1
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Microstructure and thermal properties of quasi-equal rare earth substitution Y0.5Gd0.5Ba2Cu3O6.94 superconductor

100%
Terzieva S., Stoyanova-Ivanova A., Shivachev B., Terzijska B., Zaleski A., Misiorek H., Mikli V.
Open Physics
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2009
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vol. 7
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issue 1
84-88
EN
Sintering effects in YBa2Cu3Oz samples with quasi-equal rare earth substitution have been investigated. It has been shown that the Y-123 type compound can be formed when gadolinium is partially substituted (in this case 50% atomic substitution) for yttrium. The superconducting compound was obtained by the optimized ceramic method, including solid-state reaction, melting and sintering, controlled by X-ray diffraction. The microstructure was investigated by SEM and energy dispersive X-ray analyses. An AC susceptibility measurement has shown that T c =93 K. Temperature-dependece of the thermal conductivity (4.5–300 K) of the polycrystalline Y0.5Gd0.5Ba2Cu3O6.94 sample was also measured.
2
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Photothermal methods for determination of thermal properties of bulk materials and thin films

100%
Bodzenta J., Kaźmierczak-Bałata A., Mazur J.
Open Physics
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2010
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vol. 8
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issue 2
207-220
EN
Information on the thermal properties of materials is very important both in fundamental physical research and in engineering applications. The development of materials with desirable heat transport properties requires methods for their experimental determination. In this paper basic concepts of the measurement of parameters describing the heat transport in solids are discussed. Attention is paid to methods utilizing nonstationary temperature fields, especially to photothermal methods in which the temperature disturbance in the investigated sample is generated through light absorption. Exemplary photothermal measuring techniques, which can be realized using common experimental equipment, are described in detail. It is shown that using these techniques it is possible to determine the thermal diffusivity of bulk transparent samples, opaque and semi-transparent plate-form samples, and the thermal conductivity of thin films deposited on thick substrates. Results of the investigation of thermal diffusivity of the ground in the polar region, which is based on the analysis of the propagation of the thermal wave generated by sun-light, are also presented. Based on chosen examples one can state that photothermal techniques can be used for determination of the thermal properties of very different materials.
3
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Synthesis and proton conductivity of anhydrous dendritic electrolytes

100%
Şenel M., Tülü M., Bozkurt A.
Open Chemistry
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2007
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vol. 5
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issue 2
546-556
EN
Water soluble PEG cored dendritic hexa-acid which comprises peripheral carboxylic acidic groups were prepared via nucleophilic substitution reactions. Novel anhydrous proton conducting electrolytes were prepared by incorporation of the heterocyclic protogenic solvent imidazole (Im) into PEG cored dendritic hexa acid, (PEG-HA), at several molar ratios of Im to-COOH units of PEG-HA. The complexation of PEG-HA and Im was illustrated by infrared spectroscopy (FT-IR). The materials are thermally stable up to 150 °C as evidenced by thermogravimetry analysis (TGA). Differential scanning calorimetry (DSC) results verified that the organic electrolytes are homogeneous and amorphous. The proton conductivities were characterized by means of AC impedance spectroscopy and a maximum conductivity of 1 × 10−3 S/cm was measured at 120 °C in the anhydrous state. [...]
4
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Theoretical Evaluation of Thermal Properties of TiO₂ Anatase and Rutile by using Einstein-Debye Approximation

100%
Mehmetoglu T.
Acta Physica Polonica A
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2018
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vol. 133
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issue 1
126-128
EN
In this work, we propose a new approach to accurate calculation of heat capacities at constant volume and pressure of TiO₂ anatase and rutile. The evaluation model is based on the Einstein-Debye approximation which has been extensively used in solid state physics. The application of proposed approach to anatase and rutile titanium dioxide computations results is shown to be well numerically satisfactory. This approach is valid in wide temperature ranges and can be suggested for accurate evaluation of thermal properties of solids. The calculation results are in well agreement with the literature values reported by other studies.
5
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Core/Clad Phosphate Glass Fibres Containing Iron and/or Titanium

100%
Ahmed I., Shaharuddin S. S., Sharmin N., Furniss D., Rudd C.
Biomedical glasses
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2015
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vol. 1
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issue 1
EN
Phosphate glasses are novel amorphous biomaterials due to their fully resorbable characteristics, with controllable degradation profiles. In this study, phosphate glasses containing titanium and/or iron were identified to exhibit sufficiently matched thermal properties (glass transition temperature, thermal expansion coefficient and viscosity) which enabled successful co-extrusion of glass billets to form a core/clad preform. The cladding composition for the core/clad preforms were also reversed. Fe clad and Ti clad fibres were successfully drawn with an average diameter of between 30~50 μm. The average cladding annular thickness was estimated to be less than 2 μm. Annealed core/clad fibres were degraded in PBS for a period of 27 days. The strength of the Fe clad fibres appeared to increase from 303 ± 73 MPa to 386 ± 45 MPa after nearly 2 weeks in the dissolution medium (phosphate buffered solution) before decreasing by day 27. The strength of the Ti clad fibres revealed an increase from 236 ± 53 MPa to 295 ± 61 MPa when compared at week 3. The tensile modulus measured for both core/clad fibres ranged between 51 GPa to 60 GPa. During the dissolution study, Fe clad fibres showed a peeling mechanism compared to the Ti clad fibres.
6
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Study of Thermal Properties of Cast Metal- Ceramic Composite Foams

88%
Gawdzińska K., Chybowski L., Przetakiewicz W.
Archives of Foundry Engineering
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2017
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vol. 17
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issue 4
7
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Thermal and mechanical properties of lightweight concrete with waste copper slag as fine aggregate

88%
Jaskulski R., Dolny P., Yakymechko Y., Jaskulski R., Dolny P., Yakymechko Y.
Archives of Civil Engineering
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2021
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vol. 67
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issue 3
8
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Adaptation of the modified pulse method for determination of thermal diffusivity of solids in the vicinity of the second-order phase transition points

88%
Terpiłowski J., Szczepaniak R., Woroniak G., Rudzki R.
Archives of Thermodynamics
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2013
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issue 2
9
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Synthesis and Thermal Properties of Europium-Cerium Oxide as a New Fluorite-Type Ceramic Material for Thermal Barrier Coatings Applications

88%
Mikuśkiewicz M., Stopyra M., Moskal G.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 4
10
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THE INFLUENCE OF C18-FATTY ACIDS ON CHEMICAL STRUCTURE OF CHITOSAN DERIVATIVES AND THEIR THERMAL PROPERTIES

75%
Niemczyk A., Kmieciak A., El Fray M., Piegat A.
Progress on Chemistry and Application of Chitin and its Derivatives
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2016
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vol. 21
165-175
EN
Chitosan derivatives with a series of fatty acids (FA) have been developed using simultaneous N- and O-acylation reaction by the combination of two ways of conducting the reaction, i.e. a carbodiimide catalysis and ionic amino group protection. The chemical structure of chitosan derivatives as well as the characterization of the FA substitution degree were done by the IR spectra analysis. The correlation between the substitution of the chitosan functional groups as well as the saturation of FA and the changes of structural and thermal properties of the derivatives has been presented.
11
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Thermal, magnetic and electric properties of RMn2O5(R=Tb, Dy and Ho) based multiferroics

75%
Kumar N. P., Bharadwaj S., Reddy P. V.
Multiferroic Materials
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2014
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vol. 1
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issue 1
EN
A series of multiferroic materials with the compositional formula RMn2O5 (where R=Tb, Dy andHo)were prepared by the solid state reaction technique. After characterising the samples structurally, a systematic investigation of specific heat, magnetization and dielectric studies has been undertaken, over a temperature range of 4–300 K. Based on these studies, it has been observed that all the samples exhibit multiple transitions below 45 K. A large magnetic anisotropy, primarily originating from spin-orbit coupling of R3+ moments was clearly observed in these materials. Finally, the magneto-caloric effect (MCE) computations were also carried out, mainly to examine the feasibility of using these materials as magnetic refrigerants. Suitable qualitative explanations for the various phenomena observed in this investigation are given.
12
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Studies of properties of polypropylene/halloysite composites

63%
Szczygielska A., Kijeński J.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 3
61-65
EN
The results of the studies on the synthesis, mechanical and thermal properties of polypropylene composites with various amount of halloysite filler are presented. Halloysite (HNT) belongs to the silica type characterized by a two-layer 1:1 structure. This work was aimed to develop a method for the modification of halloysite in its prime use as a filler for polypropylene by extrusion. The composites contain 1, 3, 5 and 7 wt.% of HNT. The degree of crystallinity of the composites decrease with increasing halloysite content. The results confirm the expectations that composites of interesting physicochemical, mechanical and thermal properties can be obtained. The mechanical properties studied show that the filler modification method used leads to the synthesis of polymer composites of improved thermal and mechanical properties.
13
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Investigation of transient heat transfer in composite walls using carbon/epoxy composites as an example

63%
Terpiłowski J., Gawron B., Woroniak G.
Archives of Thermodynamics
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2015
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issue 4
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