Natural Mathematical Derivation of the Gibbs-Duhem Equation Related to ΔG and partial differential partial derivativeG/partial differential partial derivativeξ

Article Engineering, Electrical & Electronic

Comment on the relationship between electrical and optical conductivity used in several recent papers published in the journal of materials science: materials in electronics

Kamal A. Aly

Summary: In this study, the relationship between electrical conductivity and optical conductivity is investigated and it is shown that the expressions recently presented in literature are incorrect.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS (2022)

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Article Physics, Multidisciplinary

A theoretical investigation of the quarter-wavelength model-part 2: verification and extension

Ying Liu et al.

Summary: The quarter-wavelength model suggests that the reflection of microwaves can be minimized by adjusting the film thickness to m lambda/4, where m is an odd integer and lambda is the wavelength within the film. However, this study challenges the validity of the model and proposes an alternative approach based on wave superposition principles. The study also criticizes the inappropriate use of certain concepts in current mainstream microwave absorption theory, such as the characterization of microwave absorption using reflection loss RL from materials.

PHYSICA SCRIPTA (2022)

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Article Education, Scientific Disciplines

Six textbook mistakes in computational physics

Alexandros Gezerlis et al.

Summary: This article discusses various erroneous claims in textbooks on numerical methods and computational physics. The authors aim to correct these widespread misconceptions by providing background comments and specific examples drawn from elementary physics and math. Additionally, they offer pointers to the specialist literature for readers who wish to explore specific topics in more detail.

AMERICAN JOURNAL OF PHYSICS (2021)

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Article Physics, Multidisciplinary

A theoretical investigation on the quarter-wavelength model - part 1: analysis

Ying Liu et al.

Summary: The study found that the quarter-wavelength-mode in microwave absorption material research has failed in most cases, and its principles are not beyond the scope of basic college courses. The correctness of the results was verified in the second part of the work, highlighting the wave-cancellation method for film as a replacement for the improper characterization of materials by reflection loss and impedance matching.

PHYSICA SCRIPTA (2021)

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Article Engineering, Chemical

A theoretical analysis of the relationships shown from the general experimental results of scattering parameters s11 and s21 - exemplified by the film of BaFe12-iCeiO19/polypyrene with i=0.2, 0.4, 0.6

Ying Liu et al.

Summary: The common practice of applying reflection loss to material is incorrect, and a new theory of wave cancellation is proposed to explain experimental data on microwave absorption by composite films. Formulae for scattering parameters of the film have been derived based on the new theory, successfully differentiating microwave absorption mechanisms.

JOURNAL OF MICROWAVE POWER AND ELECTROMAGNETIC ENERGY (2021)

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Article Education, Scientific Disciplines