Analysis of the influence of sheath positions, flight parameters and incident wave parameters on the wave propagation in plasma sheath

Zhang, Qifan; Han, Yiping; Dong, Qinlu; Dong, Chang Qing

doi:10.1088/2058-6272/ac2e53

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…Yuan et al studied the effect of atmospheric conditions on the terahertz wave attenuation and obtained geographic differences in global terahertz signal propagation [11]. Yang and Zhang et al studied the effect of flight speed and angle of attack on the transmission coefficient of terahertz waves, and analyzed the corresponding change law [12][13]. Ouyang and Tang et al numerically analyzed differences of terahertz transmission characteristics under different vehicles, and determined the corresponding terahertz communication frequency [14][15].…”

Section: Introductionmentioning

confidence: 99%

Plasma and Terahertz-Wave Propagation Characteristics in Atmospheric-Pressure Plasma Jet Under Different Operating Conditions

Ouyang

Liu

Mao

et al. 2023

IEEE Trans. Antennas Propagat.

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High density plasma source device is of great significance for ground experiment verification of vehicle reentry communication. APPJ, as a high-density plasma source, has received little attention in ground experiments on vehicle communications. In this paper, terahertz wave propagation characteristics in APPJ are investigated by joint simulation of APPJ discharge and terahertz transport model and related experimental measurements. THz-IF system is used to diagnose the electron density and terahertz transmission characteristics of APPJ for the first time, and the measured results are in good agreement with simulation results of joint simulation model in this paper and measured results of THz-TDS system of other researchers. Sheath thickness and electron density produced by self-designed APPJ are highly matched with the plasma sheath environment of HIFIRE-5b vehicle. Further analysis of the influence of different voltages and needle electrode radius on the terahertz transmission characteristics shows that the absorption effect plays a major role in terahertz wave attenuation in APPJ, and contribution of collision effect almost disappears, which is completely consistent with the phenomenon observed in HIFIRE-5b vehicle. The joint simulation model and THZ-IF method developed in this paper are of great significance for the ground test verification of reentry communication schemes.

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Section: Introductionmentioning

confidence: 99%

Plasma and Terahertz-Wave Propagation Characteristics in Atmospheric-Pressure Plasma Jet Under Different Operating Conditions

Ouyang

Liu

Mao

et al. 2023

IEEE Trans. Antennas Propagat.

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“…It is just that there is a lack of systematic theory, training system and training plan during this period, later, scholars put these scattered trainings, the method is generally defined as "Plyometrics", which lays the foundation for the training system of fast scaling compound training. 1,2…”

Section: Introductionmentioning

confidence: 99%

Impact of Plyometric Training on the Lower Limb Strength of Gymnasts

Chen

2023

Rev Bras Med Esporte

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Introduction: Plyometric training consists of a compound of stretching followed by immediate contraction, favoring the elastic properties of the soft tissues and aiming to promote a higher explosive force in the athletes. Objective: Explore the impact of plyometrics on aerobic gymnastics practitioners' explosive force in the lower limbs. Methods: In this experiment, a total of 16 aerobic gymnastics athletes were selected and divided into two groups: the control group and the experimental group. The control group remained with their usual training, while a sport-specific plyometric protocol was added to the experimental group. Results: Composite plyometric training can improve the short-distance running ability of aerobic gymnastics athletes; the effect of running 5m in the start and 10m in the start was statistically evidenced. However, the 20m run had similar results. Conclusion: The explosive power of the lower limbs in different activities is related to the specific training of aerobic gymnastics athletes focused on the muscles corresponding to the activity, showing a significant positive correlation. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

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The cause and the evolution of “lens” structure for terahertz signals in hypersonic plasma sheaths

Peng,

Yuan,

Mao

et al. 2024

AIP Advances

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Reentry vehicles in near space used to suffer from communication blackout, which is led by the plasma sheath enveloping the whole reentry vehicle. Terahertz (THz) communication is believed to be a potential solution to mitigate the communication blackout effectively. Previous studies have investigated the attenuation characteristics of THz signals in plasma sheaths. However, the offset of THz signal transmission direction by the plasma sheath has rarely been a concern. In this study, the auto-evolution of the plasma sheath is taken into account. The consequent evolution of the refraction index distribution of the plasma sheath is investigated. It is found that the plasma sheath acts as a gradient index lens to the propagating THz signals. The lens structure keeps evolving due to the evolution of the plasma sheath itself. The main mechanism that dominates the evolution of the lens structure is the convection of electrons. By analyzing the offset of the transmission direction yielded by the lens structure, it is suggested that the onboard THz antenna could be installed close to the bottom of the vehicle in order to stabilize the transmission direction of THz signals in an evolving plasma sheath.

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Analysis of the influence of sheath positions, flight parameters and incident wave parameters on the wave propagation in plasma sheath

Cited by 5 publications

References 17 publications

Plasma and Terahertz-Wave Propagation Characteristics in Atmospheric-Pressure Plasma Jet Under Different Operating Conditions

Plasma and Terahertz-Wave Propagation Characteristics in Atmospheric-Pressure Plasma Jet Under Different Operating Conditions

Impact of Plyometric Training on the Lower Limb Strength of Gymnasts

The cause and the evolution of “lens” structure for terahertz signals in hypersonic plasma sheaths

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