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Defect entropies and enthalpies in BaF2

100%
Katsika-Tsigourakou V., Skordas E.
Open Physics
|
2010
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vol. 8
|
issue 6
900-904
EN
Various experimental techniques have revealed that the predominant intrinsic point defects in BaF2 are anion Frenkel defects. Their formation, enthalpy and entropy, as well as the corresponding parameters for the fluorine vacancy and fluorine interstitial motion have been determined. In addition, low temperature dielectric relaxation measurements in BaF2doped with uranium leads to the parameters τ0, E in the Arrhenius relation τ = τ0 exp(E/k B T) for the relaxation time τ. For the relaxation peak associated with a single tetravalent uranium, the migration entropy deduced from the pre-exponential factor τ0 is smaller than the anion Frenkel defect formation entropy by almost two orders of magnitude. We show that, despite their great variation, the defect entropies and enthalpies are interconnected through a model based on anharmonic properties of the bulk material which have been recently studied by employing density-functional theory and density-functional perturbation theory.
2
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A simple model for calculating the compressibility of the transition-metal carbides and nitrides alloys ZrxNb1−xC and ZrxNb1−xN

80%
Katsika-Tsigourakou V.
Open Physics
|
2011
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vol. 9
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issue 5
1309-1314
EN
The 4d-transition-metals carbides (ZrC, NbC) and nitrides (ZrN, NbN) in the rocksalt structure, as well as their ternary alloys, have been recently studied by means of a first-principles full potential linearized augmented plane waves method within the local density approximation. These materials are important because of their interesting mechanical and physical properties, which make them suitable for many technological applications. Here, by using a simple theoretical model, we estimate the bulk moduli of their ternary alloys ZrxNb1−xC and ZrxNb1−xN in terms of the bulk moduli of the end members alone. The results are comparable to those deduced from the first-principles calculations.
3
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EFFECT OF ULTRASONIC VIBRATION ON THE SOLIDIFICATION OF 35CrMo STEEL

70%
ZHENG-BING X., Huang Y.-C.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 1
4
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Technical assessment of old buildings by fuzzy approach

70%
Konior J., Konior J.
Archives of Civil Engineering
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2019
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vol. 65
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issue 1
5
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Calculation of atomic spontaneous emission rate in 1D finite photonic crystal with defects

70%
Rudziński A., Szczepański P.
Open Physics
|
2010
|
vol. 8
|
issue 5
746-759
EN
We derive an expression for the spontaneous-emission rate in finite one-dimensional photonic crystals with arbitrary defects, using the effective resonator model to describe electromagnetic field distributions in the structure. We obtain explicit formulae for contributions from different modes, i.e. radiation, substrate and guided modes. Formal calculations are illustrated by a few numerical examples, which demonstrate that application of the effective resonator model simplifies the interpretation of results.
6
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Multiproduct Fabrication-Shipment Decision Making Incorporating an Accelerated Rate and Ensured Product Quality

61%
Chiu Y.-S. P., Chiu V., Lin H.-D., Chiu T., Chiu Y.-S. P., Chiu V., Lin H.-D., Chiu T.
Management and Production Engineering Review
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2021
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vol. 12
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issue 2
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