This study theoretically analyzes the propagation properties of terahertz (THz) electromagnetic waves in a magnetized plasma that is inhomogeneous both collision frequency and electron density. Three parabolic profiles are adopted to describe inhomogeneity these two parameters slab. Numerical calculation results show when magnetic field applied, an absorption valley appears near middle peak. The characteristics spectra affected by factors: (1) plasma's first layer, which border between air...

The effect of an inhomogeneous collision frequency on the propagation electromagnetic waves in a high temperature magnetized plasma is analyzed numerically. A parabolic profile adopted to describe non-uniformity frequency. results numerical calculations show that caused by inhomogeneity can be weakened higher electron density; it also strengthened larger thickness and stronger We found same order as originated from density. presented may improve modeling accuracy applications related space...

The propagation properties of electromagnetic wave (EMW) in a moving nonuniform plasma are first introduced this study. incident frequency and the angle incidence EMW discussed detail by analyzing relativistic model. It has been obtained that both them strongly affected speed. By utilizing Wentzel-Kramers-Brillouin approximation method plasma, density parabolic profile is taken as an example to make analyses about these six parameters Results indicate influences five on attenuation same...

The absorption coefficient of electromagnetic waves by a moving non-uniform plasma slab is investigated theoretically. Two cases movement are considered: (1) the moves parallel to interface and (2) perpendicular interface. In both cases, influences six typical parameters on discussed in detail analyzing relativistic model. It has been obtained that strongly affected velocity plasma. Various interesting features concerning variation obtained, which very important for applications space exploration.

The rough structure may affect the flow field and electromagnetic (EM) scattering characteristics of a hypersonic vehicle. In this study, EM vehicle RAM C-II with microrough surface were investigated in millimeter wave band. We first simulated smooth calculated radar cross section (RCS) wideband using physical optics method. calculation results show that many factors contribute to variation RCS; however, it is occasionally difficult predict. then used one-dimensional Gaussian random generate...

Dust particles generated from the thermal protection layer greatly influence propagation of electromagnetic (EM) waves in plasma sheath. This paper presents first calculation effects these dust on microstrip antenna radiation. On basis an integrated model ablation sheath and C-band antenna, ray tracing method is used to obtain disturbed electric field a traditional dusty (with different parameters). The results show that cause greater attenuation incident waves, parameters have penetrating...

Propagation properties of Electromagnetic wave (EMW) in a moving non-uniform plasma are firstly introduced theoretically this investigation, the density parabolic profile taken. By analyzing relativistic model, incident frequency and angle EMW discussed detail. Five parameters presented by utilizing Wentzel-Kramers-Brillouin (WKB) approximation method plasma, influences these five same no matter is stationary or moving. Results indicate there exist two interesting features concerning EMW.

Plasma shock waves represent high-speed, nonlinear motion states of plasma in which the physical parameters fluid, such as density, temperature, and velocity, vary dramatically within a limited space. These variations make studying electromagnetic wave propagation difficult. In this study, we calculate spatial distribution frequency collision layer based on one-dimensional structure wave. process from upstream to downstream wave, increases function electron density; downstream, free stream...

The reason for communication blackout in hypersonic vehicles is strong interference from the plasma sheath on antenna radiation. This paper presents calculation of effects a microstrip radiation using ray tracing method, method comprising an accurate and complex theoretical algorithm. Using integrated model antenna, used to obtain disturbed electric field with different parameters. study reveals that sensitivity X-band alteration parameters lower than C-band These numerical results provide...

Hypersonic velocities can theoretically affect the propagation of electromagnetic waves in a plasma sheath covering vehicle. This article is continuation our previous study and, for first time, investigates reflection characteristics by moving bounded slab and examines five typical parameters detail when moves parallel to interface. The results show that motion significantly affects propagation, coefficient oscillates with velocity sheath. In addition, different physical cause oscillation...

The effects of nonuniform moving plasma on the polarization properties electromagnetic (EM) waves were theoretically studied. Taking L -band right-hand circularly polarized (RHCP) wave as an example, based slab perpendicularly to incident wave, relationship between transmitted and normalized velocity was analyzed. results indicate that state is closely related slab. When approaches its influence greater than away from wave. In addition, when change reaches maximum, corresponding mainly...

Electron density is one of the most important parameters for characterizing plasma properties, so obtaining accurate electron a prerequisite studying interaction between and electromagnetic waves. This paper presents effects different densities on electric field distribution microstrip antenna with center frequency 2.45 GHz. Then, basis integrated model antenna, Bayesian regularization neural network (BRNN) used to retrieve inhomogeneous plasma. Furthermore, performance proposed approach...

The interaction mechanism between plasmas and electromagnetic waves has not been fully defined, experiments are helpful for investigating the verifying theoretical analysis. This paper proposes a point-focusing lens antenna based on three-dimensional (3D) printing technology experimental study of small-area plasma. First, CST simulation software was used design horn focusing lens. Subsequently, 3D to print combined with verification performance. Finally, an wave passing through plasma...

The propagation properties of Terahertz (THz) electromagnetic waves in a weakly ionized dusty plasma are introduced this study. Epstein profile is adopted to describe the non-uniformity electron density simulation. By utilizing SMM approximation method, numerical calculation results show that particles significantly affects propagation. Specifically, parameters have great influence on reflection and transmission characteristics. Meanwhile, various interesting features concerning coefficients...

Objective To investigate the effect of surgical treatment spontaneous rupture esophagus in adults. Methods Sixty-six cases adults were treated by open chest exploration for esophageal repair and thoracoscopy assisted drainage empyema. Results The proportion primary healing was 83.3% (55/66), postoperative leak 12.1% (8/66). Eight leakage cured active anti-inflammatory, thoracic support treatment. Two patients (3.0%) died severe mediastinitis sepsis. Conclusions Early...

The communication of hypersonic vehicles will be affected by the magnetized inhomogeneous plasma on their surface. Therefore, phase-frequency characteristics electromagnetic(EM) wave in magnetization with electron density and collision frequency are studied. influence magnetic field strength, density, polarization direction phase shift parameters numerically simulated. results show these have a significant impact characteristics.

Abstract 3D orthogonal woven composites are receiving increasing attention with the ever-growing market of industries. New challenge what we face to is how damage tolerance improve in such and layer-to-layer structure under both mechanical extreme environment. In this paper, a novel impact suppression strategy proposed by combining structural electromagnetic properties realize advanced functionalities. An integrated experimental platform designed power system, drop-testing machine data...

Effects of nonuniform weakly ionized dusty plasma on the polarization properties obliquely incident electromagnetic (EM) waves were theoretically investigated in this paper. The dielectric coefficient magnetized is obtained based Bhatnagar–Gross–Krook collision model. Then, effects external magnetic field, dust radii, and density mismatch loss EM L-band analyzed using equivalent impedance method. Results indicate that larger greater loss. In addition, we also found particles alleviate...

Plasma around an antenna will change the impedance of antenna, which lead to resonance frequency, pattern, and voltage standing wave ratio. In this paper, plasma electron density was estimated by analyzing variation performance parameters. Results indicate that complex nonlinear relationship between parameters can be neural network method, provide a convenient method estimate density.

The method of reducing ablative plasma to dusty is detailed. results are shown in the form antenna patterns, which show that increase radius and density decrease charging frequency would intensify attenuation electromagnetic field. electric field intensity was obtained through ray-tracing with ray-based coordinate system simplify calculation, carried out under different radius, densities frequencies dust grains. above parameters used acquire coefficient for further counting propagating...