Friends who pay attention to science may notice that Professor Yang Zhenning repeatedly mentioned Maxwell's equations in his report, which shows the wide influence of this equation system in physics.
Just as Newton's three laws are important to classical mechanics, Maxwell's equations are at the core of classical mechanics, which uses four equations to completely describe the laws of classical electromagnetic interaction, and it can be said that Maxwell's equations ignited the human power revolution and the information revolution, penetrating into all aspects of human life.
Recently, Wang Zhonglin, director and chief scientist of the Beijing Institute of Nanoenergy and Systems of the Chinese Academy of Sciences and a foreign academician of the Chinese Academy of Sciences, claimed that he successfully expanded Maxwell's equations. For this achievement, CCTV News also reported.
It is said that the extended Maxwell equation system generalized the Maxwell equations based on the static electromagnetic field theory to the moving medium, successfully expanded the scope of application of Maxwell's equations, and laid the theoretical foundation for the electrodynamics of moving dielectrics. The results were published in the recent international academic journal Materials Today.
An expanded new Maxwell system of equations
Here's the thing, Maxwell's equations in a vacuum don't have any flaws, the key is when they are introduced into the medium. Maxwell's equations in the medium are subdivided into two cases: a stationary medium and a moving medium. For the case of resting media, the introduction of the electrical displacement vector D can also be well described. However, when the medium is in motion, the calculation results using this equation will be flawed.
Academician Wang said that problems arise when the classical Maxwell equations are applied to high-speed moving objects, such as high-speed rail, airplanes and satellites.
In 2017, Academician Wang Zhonglin expanded the expression of displacement current, adding Ps phase to the electrical displacement vector D to derive the output power of the nanogenerator. Among them, Ps is the polarization density caused by the electrostatic charge of the surface generated by mechanical triggering, unlike the dielectric polarization P caused by the electric field. With or without an applied electric field, this surface electrostatic charge can be generated in piezo polarization and frictional onset.
In 2019, Wang Zhonglin analyzed and derived the transmission equation of the nano-generator, the analytical expression of the Ps term, the output power and spatial electromagnetic field distribution under load and the general formula of its radiation, and gave the analytical solution of the four modes of friction nanogenerator, laying the overall theoretical framework of the nano-generator and forming the theoretical foundation for the development of this discipline.
Academician Wang said that the expanded system of equations not only includes the most common Doppler effect, but also includes the correction of the amplitude and phase of electromagnetic waves that drive moving objects, and it is expected that there will be applications in future communications.
however... When the news came out, it caused a huge shock in the physics community. The physics community has also come out one after another to point out Academician Wang's mistakes.
First, there is an answer that points out that the results of the paper are themselves wrong.
Second, some netizens pointed out that the problem handled by Academician Wang was actually mentioned in the textbook "Continuous Dielectric Electrodynamics" by the famous Soviet physicist Lang Dao decades ago, and it was not a new discovery at all.
Sun Changpu, an academician of the Faculty of Mathematics and Physics of the Chinese Academy of Sciences and a theoretical physicist, commented:
This time, the media release of a research institute of the Chinese Academy of Sciences on "Chinese scientists successfully expanding Maxwell's equation" is very unprofessional. I read the article and thought it was just a discussion of the Equations of Maxwell's equations in the medium, about the relationship between E and D, B and H in moving media. In the 1950s, Mr. Huang Kun, a famous physicist in mainland China, studied the correction of maxwell's equations in the medium from a microscopic point of view. In the 1970s, M. Lax had a more detailed systematic analysis. However, the release of "extensions" and "breakthroughs" does not cite these famous works, as if they did not know these. Major breakthroughs cannot be based on "ignorance."
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