The expanded Maxwell's equations for a mechano-driven media system that moves with acceleration

Article Materials Science, Multidisciplinary

On the expanded Maxwell's equations for moving charged media system-General theory, mathematical solutions and applications in TENG

Zhong Lin Wang

Summary: This study derived the expanded Maxwell's equations for moving media and time-dependent configurations from the integral form of the equations. These expanded equations are the most comprehensive governing equations including both electromagnetic interaction and power generation. The study also developed a first principle theory for triboelectric nanogenerators based on these expanded equations. Additionally, general approaches for solving the expanded Maxwell's equations and calculating the displacement current for the output power of the nanogenerators were presented. The impact of this theory extends to electromagnetic wave generation and interaction with moving objects such as trains, cars, jets, missiles, comets, and galaxy stars if observed from earth.

MATERIALS TODAY (2022)

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Article Chemistry, Physical

An easy and efficient power generator with ultrahigh voltage for lighting, charging and self-powered systems*

Xia Cao et al.

Summary: The advancement of science and technology has led to astonishing developments, such as the invention of an easy and efficient power generator (EEPG) that can drive fluorescent tube lamps and charge mobile phones. With ultrahigh voltage, it can be used for lighting, charging, and collecting wind and tidal energy. It overcomes the limitations of traditional power generation methods that require specific conditions.

NANO ENERGY (2022)

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Article Multidisciplinary Sciences

Underwater wireless communication via TENG-generated Maxwell's displacement current

Hongfa Zhao et al.

Summary: The authors introduced an underwater wireless communication approach based on a triboelectric nanogenerator, which provides a self-powered communication system in complex underwater environments. Through modulating and demodulating the generated electric signals, texts and images can be transmitted, and underwater lighting system can be operated wirelessly.

NATURE COMMUNICATIONS (2022)

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Article Multidisciplinary Sciences

Lorentz Transformation in Maxwell Equations for Slowly Moving Media

Xin-Li Sheng et al.

Summary: In this study, the method of field decomposition is employed to investigate the small velocity approximation (SVA) of the Lorentz transformation in slowly moving media. The deformed Maxwell equations derived using SVA can be converted into the conventional form in the medium's co-moving frame. The results demonstrate that the Lorentz transformation in SVA is essential in deriving these equations, and both time and charge density must change in different frames.

SYMMETRY-BASEL (2022)

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Article Physics, Multidisciplinary

Maxwell's equations for a mechano-driven, shape-deformable, charged-media system, slowly moving at an arbitrary velocity field v(r,t)

Zhong Lin Wang

Summary: This article introduces the differential form of Maxwell's equations and the derivation method for moving media systems, as well as provides research steps and methods for electrodynamics in non-inertia frame of references. The study shows that these equations are applicable for describing various forms of media systems and their electromagnetic coupling behaviors.

JOURNAL OF PHYSICS COMMUNICATIONS (2022)

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Review Physics, Multidisciplinary

From contact electrification to triboelectric nanogenerators

Zhong Lin Wang

Summary: The review delves into the mechanisms of contact electrification and the principles of triboelectric nanogenerators, providing a comprehensive overview from basic physics to engineering applications. It discusses the output power, electromagnetic behavior, and current transport equation for TENGs, setting a standard theory for quantifying their performance. Additionally, the review explores the diverse applications of TENGs in harvesting mechanical energy for various sectors including energy science, environmental protection, wearable electronics, medical science, robotics, and artificial intelligence.

REPORTS ON PROGRESS IN PHYSICS (2021)

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Article Multidisciplinary Sciences

A paradigm shift fully self-powered long-distance wireless sensing solution enabled by discharge-induced displacement current

Haoyu Wang et al.

Summary: This study proposes a self-powered wireless sensing solution based on breakdown discharge-induced displacement current, which combines multiple functional modules into a single self-powered wireless sensing e-sticker. The e-sticker features small size and long transmission distance, with functions of multipoint motion sensing and gas detection, showing great potential for various applications.

SCIENCE ADVANCES (2021)

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Article Chemistry, Physical