Sheath Effects Research Articles

Effects of the Radicle Sheath on the Rhizosphere Microbial Community Structure of Seedlings in Early Spring Desert Species Leontice incerta

Most research on plant–microbe interactions emphasize the effects of micronutrients on the rhizosphere microbial community structure. However, the influence of seed structures, particularly the radicle sheath, on microbial diversity at the seedling root tips under varying temperatures and humidity has been less explored. This study conducted controlled indoor experiments in the northern desert of Xinjiang to assess the radicle sheath’s impact on microbial community composition, diversity, and function. The results indicated no significant changes in the Chao1 index for bacteria and fungi, but notable differences were observed in the Shannon and Simpson indices (p < 0.05). Under drought conditions, the radicle sheath significantly reduced bacterial infections without affecting fungi. Genus-level analysis showed an increased abundance of specific dominant bacterial groups when the radicle sheath was retained. NMDS analysis confirmed its significant effect on both bacterial and fungal community structures. LEfSe analysis identified 34 bacterial and 15 fungal biomarkers, highlighting the treatment’s impacts on microbial taxonomic composition. Functional predictions using PICRUSt 2 revealed that the radicle sheath facilitated the conversion of CH4 to CH3OH and various nitrogen cycle processes under drought. Overall, the radicle sheath plays a crucial role in maintaining rhizosphere microbial community stability and enhancing the functions of both bacteria and fungi under drought conditions.

Effect of a Novel Ergonomic Sheath on Dental Device-Related Muscle Work, Fatigue and Comfort-A Pilot Clinical Study.

Background: Dental instrumentation with hand-held devices is associated with discomfort, fatigue and musculoskeletal diseases or repetitive stress injuries. The goal of this in vivo study was to determine the effect of an ergonomic handle sheath on muscle work, comfort and fatigue associated with (a) piezoelectric scaling by hygienists with and without musculoskeletal disorders (MSDs), and (b) dental cavity preparation by healthy dentists using a dental micromotor. Materials and Methods: Two groups of ten hygienists each tested the piezoelectric scaler. Hygienists in Group 1 had no MSDs, while those in Group 2 had been diagnosed with MSDs. Additionally, ten dentists with no MSDs used a dental micromotor to prepare four standardized cavities. Time-based work in four muscles, comfort and fatigue were recorded in the presence and absence of an add-on soft, insulating handle sheath. Data were analyzed using a repeated measures analysis of variance model with Tukey's post-hoc test. Results: Comfort, fatigue and muscle work were significantly better for both devices when the sheath was used. While hygienists with MSDs used more muscle work to complete the set scaling task, and the sheath-related reduction in work was somewhat greater, these MSD-related differences did not quite reach significance. Conclusions: The results of this pilot study show that the ergonomic performance of an ultrasonic scaler and a dental micromotor may be improved by the use of an ergonomic handle sheath.

Effects of Cable Sheath on Deformation Coordination between the Sensing Fiber and Sand

Effects of Cable Sheath on Deformation Coordination between the Sensing Fiber and Sand

Clinical Effect of Combined Fascia Sheath Suspension With Shortening Levator Muscle on Severe Blepharoptosis.

To study the clinical effect of conjoint fascial sheath (CFS) suspension and levator palpebrae superioris muscle shortening in the treatment of severe blepharoptosis. Forty-five patients with severe blepharoptosis (75 eyes) from May 2020 to February 2022 in the authors' hospital were divided into 2 groups: group A (n = 33, 43 eyes) and group B (n = 24, 32 eyes). Group A was operated on by CFS + levator muscle shortening, and group B was operated on by frontal muscle flap suspension + levator muscle shortening. Both groups were followed up for 12 months (until February 2023). The clinical effect was counted in 6 months after operation, the early complications were counted in 1 month after operation, and the late complications were counted in 1 month to 12 months after operation. Margin to corneal reflex distance 1 (MRD1) and palpebral fissure height (PFH) were recorded before, 1 week, 3 months, and 12 months postoperatively, and the amount of eyelid retrogression was counted again. The good correction rate was 90.70% in group A, higher than in group B (71.88%), and the difference was statistically significant (P< 0.05); the early postoperative complication rate was 9.30%, lower than in group B (24.38%), and the difference was statistically significant (P< 0.05); the late postoperative complication rate was 2.33%, lower than group B (18.75%), and the difference was statistically significant (P< 0.05). The MRD1 and PFH of group A were higher than those of group B (P< 0.05) at 3 months postoperatively and 12 months postoperatively; the MRD1 and PFH of group A were lower than those of group B (P< 0.05) at 3 months postoperatively and 12 months postoperatively. Repeated measurement analysis of variance showed that there were significant differences in the main effects of MRD1, PFH, eyelid retrogression, and time in group A and group B (P< 0.05), and there was interaction between intervention and time (P< 0.05). Conjoint fascial sheath suspension combined with levator palpebrae superioris muscle shortening can effectively improve MRD1 and PFH, and the amount of upper eyelid retraction is controllable 1 year after operation.

Evaluation of tricuspid valve regurgitation following transvenous rotational mechanical lead extraction.

Transvenous lead extraction (TLE) is potentially complicated by significant tricuspid valve regurgitation increase (TRI). However, there are limited data on the effect of the bidirectional rotational mechanical sheaths on significant TRI. The aim of the present study was to investigate the rate of significant changes in tricuspid regurgitation (TR) severity following mechanical rotational TLE and their outcomes. In 158 patients (mean age 66 ± 16.9 years) undergoing mechanical rotational TLE, acute changes in TR severity were assessed by echocardiography evaluation. A significant acute TRI was defined as an increase of at least one grade with a post-extraction severity at least moderate. A total of 290 leads were extracted (mean implant duration, 93 ± 65 months). Significant TRI was noted in 5.7% of patients, and it was linked to tricuspid valve damage, TLE infection indication, and longer lead implant duration. Univariate predictors of significant TRI included implant duration of all leads [odds ratio (OR) 1.01; 95% confidence interval (CI) 1.003-1.018; P = 0.001] and right ventricular leads (OR 1.01; 95% CI 1.004-1.017; P = 0.002). Severe increase of TR following TLE was an independent predictor of mortality [hazard ratio (HR) 5.20; 95% CI 1.44-18.73; P = 0.012 ] along with severe systolic dysfunction (HR 2.37; 95% CI 1.01-5.20; P = 0.032), and systemic infection (HR 2.28; 95% CI 1.06-4.89; P = 0.035). Significant TRI was detected in 5.7% of patients following transvenous rotational mechanical lead extraction. The duration of lead implantation emerged as the sole predictor of significant TRI. Physicians engaged in TLE should exercise greater vigilance for this potential complication.

A Multi-Cycle Echo Energy Concentration Method for High-Mobility Targets Enveloped by Time-Varying Plasma Sheath

When a target moves at hypersonic speed, the aerodynamic thermal effect will cause air molecules to form a plasma sheath that envelopes the outer surface of the target, which consists of a large number of charged particles. The plasma sheath imposes a complicated modulation effect on the radar echo signal in terms of amplitude, phase, and frequency. When the plasma sheath is time-varying, the inter-pulse coherence of the multi-cycle echo signals is severely disrupted, resulting in the failure of coherent accumulation. To address the problem of abnormal inter-pulse energy accumulation in targets covered with time-varying plasma sheaths, we analyzed the dynamic modulation effects of time-varying plasma sheaths on echo signals and constructed a radar echo model enveloped with time-varying plasma sheaths. Based on this, we propose a method for inter-pulse energy concentration of multi-cycle echo signals based on range-frequency inversion, second-order Wigner–Ville distribution (WVD), and slow-time symmetric auto-correlation. The proposed method is capable of realizing energy concentration for targets enveloped with time-varying plasma sheaths and can accurately estimate the motion parameters of the target. The effectiveness of our proposed method has been verified via simulation analysis of multi-cycle echo signals from targets enveloped with time-varying plasma sheaths, and the reliability of the method has been further validated through statistical experimental analysis.

In-situ shrinkage /swelling behavior and displacement based on vascular bundle morphological difference

The swelling/shrinking behavior is a complex process of interactions between multiscale structures, and it is also a major problem affecting the processing and utilization of bamboo. As an important structure connecting macroscopic and cellular scales in bamboo, the analysis of vascular bundles' swelling/shrinking behaviors is important for revealing the swelling/shrinking laws of bamboo. In this study, in-situ observation technique was used to characterize the swelling/shrinking behaviors of open vascular bundles, open fibers, semi-open vascular bundles and semi-open fibers, and further analyzed the area change and location change of open vascular bundles (OV) and its fibers (OF), semi-open vascular bundles (HOV) and its fibers (HOF), and then analyzed the area and position change. During the swelling/shrinking cycle, the area change patterns of HOV was similar. The shrinkage rate of OV varied little, with a range of 1–0.74 %. The shrinkage rate of HOV was 1–0.18 %. The shrinkage ranges for OF and HOF fibers were closer, 1–0.2 % and 1–0.18 %, respectively. Swelling/shrinking was accompanied by movement of vascular bundles and fiber, with HOV moving in a radial direction and OV moving in a definite direction. Random forest simulations reveal that the effect of different fiber sheaths on the shrinkage area of the vascular bundle varies, and the HOV is more affected by the fiber sheath，its factor importance is 0.47. The importance of the fibrous sheath “a” to the OV area is only 0.24. This provides an important reference for the subsequent establishment of multiscale swelling/shrinking relationships for bamboo.

Intrarenal pressure detection during flexible ureteroscopy with fiber optic pressure sensor system in porcine model

To validate the feasibility of a fiber-optic pressure sensor-based pressure measurement device for monitoring intrarenal pressure and to analyze the effects of ureteral acess sheath (UAS) type, surgical location, perfusion flow rate, and measurement location on intrarenal pressure (IRP). The measurement deviations and response times to transient pressure changes were compared between a fiber-optic pressure sensing device and a urodynamic device IRP in an in vitro porcine kidney and in a water tank. Finally, pressure measurements were performed in anesthetized female pigs using fiber-optic pressure sensing device with different UAS, different perfusion flow rates, and different surgical positions at different renal calyces and ureteropelvic junctions (UPJ). According to our operation, the result is fiber optic pressure sensing devices are highly accurate and sensitive. Under the same conditions, IRP varied among different renal calyces and UPJ (P < 0.05). IRP was lowest at 50 ml/min and highest at 150 ml/min (P < 0.05). Surgical position had a significant effect on IRP (P < 0.05). 12/14 Fr UAS had a lower IRP than 11/13 Fr UAS. Therefore fiber optic pressure sensing devices are more advantageous for IRP measurements. In ureteroscopy, the type of ureteral sheath, the surgical position, the perfusion flow rate, and the location of the measurement all affect the intrarenal pressure value.

Controlled Synthesis of Ag@Polythiophene Nanocables by Ion Adsorption Technique

Ag@Polythiophene nanocables were synthesized by Ion Adsorption Technique. In this approach, the pre-synthesized Ag nanowires were dispersed in aqueous solution of copper acetate and the Cu2+ ions adsorbed onto the surface of Ag nanowires. These nanowires were then redispersed in aqueous solution of thiophene. The adsorbed Cu2+ ions oxidized thiophene monomer to polymerize into uniform polythiophene sheath outside Ag nanowires. Thus, it has transformed pre-synthesized Ag NWs into polythiophene Nanocables (NCs). The morphology of pristine Ag NWs and Ag@polythiophene NCs were characterized by scanning electron microscopy (SEM), which showed sheathing effect at Ag NWs and indicated the successful coating over its surface. Optical and electronic properties were determined by UV-Vis spectroscopy and PL spectroscopy. The functional groups were determined by Fourier transform infrared spectroscopy (FT-IR). The peaks at 1482 cm-1, 1625 cm-1, 1223 cm1, 825 cm-1 and 722 cm-1 confirmed the polythiophene coating on Ag NWs. Furthermore, the thermal stability was monitored by thermogravimetric analysis (TGA) which showed enhanced thermal stability of Ag@Polythiophene nanocables as compared to pristine Ag NWs.

Sheath-outside AE monitoring method for multiple sources of damage to cables considering the effect of an HDPE sheath on AE propagation

Cable is one of the important components of cable-stayed bridges, there are three common damages: broken wire, corrosion and fatigue. High-density polyethylene (HDPE) sheaths will induce the attenuation of acoustic emission (AE) signals of damage to cables. Therefore, three cables with different wire counts are used for AE monitoring. The relationship between the thickness and the AE transmittance coefficient of HDPE sheaths, and a circumferential AE attenuation model are established for each cable. According to the transmittance coefficient and circumferential attenuation model, a sensor arrangement method for monitoring the wire breakage, corrosion, and fatigue of cables is quantitatively given. The results show that the transmission coefficient linearly decreases with an increase in HDPE sheath thickness with a slope of approximately 0.012. The circumferential AE amplitude attenuation rates for the three types of cables are 9.9%, 18.74%, and 21.13%, respectively. Monitoring the wire breakage requires only one sensor; monitoring corrosion and fatigue damage only requires one sensor for the 61-strand cable, symmetrical-arrangement two sensors for cables with 349 and 547 strands.

The Effect of Ureteral Access Sheath Use/Caliber Change on Outcomes of Retrograde Intrarenal Surgery, Short-Term Kidney Functions, Radiation Exposure, Ureteroscope Lifetime, and Factors Predicting Insertion Failure: A RIRSearch Study.

Background: The aim of this study was (1) to explore effect of ureteral access sheath (UAS) use on primary retrograde intrarenal surgery (RIRS) outcomes, short-term kidney functions, radiation exposure, and ureteroscope lifetime (URS-LT) and (2) to reveal factors that predict UAS insertion failure. Materials and Methods: Patients (n = 1318) who underwent RIRS without UAS (Group 1), those who had operation with a <11-13 Fr (Group 2), and those with a ≥11-13 Fr UAS were matched (1:1:2) and compared. Stone-free rate (SFR), intra- and postoperative complications, acute kidney injury (AKI), fluoroscopy time, URS-LT, and UAS insertion failure were the outcomes. Results: SFR, which was highest in Group 3 (75%, 71% and 87.3%, respectively; P = .001), was significantly associated with use of ≥11-13 Fr (odds ratio [OR]: 4.2, P < .001), but was not with use of <11-13 Fr UAS (OR: 1.3, P = .3). Group 3 had less need for auxiliary procedure (15%, 16%, and 7.4%, respectively; P = .03). Five percent of patients had a risk of AKI, but only 0.3% developed AKI. Although UAS use was protective against creatinine increase (OR: 0.65, P = .02), increased risk of AKI was only associated with female gender (OR: 5.5, P < .001). Fluroscopy times were 5, 15, and 87 sn, respectively (P < .001). Short URS-LT was strongly associated with high frequency of lower calix stones (r = -0.94, P = .005), but URS-LT was not correlated with sheathless case rate (r = 0.59, P = .22). UAS insertion success in first attempt was more likely in younger (OR: 0.99, P = .03), hydronephrotic (OR: 3.4, P < .001), and female cases (OR: 1.5, P = .008). But absolute UAS insertion failure was associated with female gender (OR: 2.7, P = .017). Conclusions: Not any UAS use but a higher caliber UAS use may improve SFR and protect against AKI after RIRS. Although UAS insertion failure is seen mostly in men, it may be more challenging in women owing to less efficacy of preoperative Double-J stent.

TCT-370 Effect of Thin-Walled Radial Sheath for Large-Bore Access on Reducing Periprocedural Radial Artery Occlusion Following Complex PCI: The REDUCE-RAO Randomized Trial

TCT-370 Effect of Thin-Walled Radial Sheath for Large-Bore Access on Reducing Periprocedural Radial Artery Occlusion Following Complex PCI: The REDUCE-RAO Randomized Trial

Intrarenal Pressure Measured Using a Novel Flexible Ureteroscope with Pressure Sensing Capabilities: A Study of the Effects of Ureteral Access Sheath, Irrigation, and Working Channel Accessories.

Introduction: Intrarenal pressure is emerging as an important monitoring parameter during flexible ureteroscopy (fURS). We measure how intraoperative conditions affect intrarenal pressure using a novel pressure sensing ureteroscope. Methods: The LithoVue Elite (LVE) single-use digital flexible ureteroscope (Boston Scientific) is the first commercial ureteroscope that senses pressure at its tip. LVE was used in a porcine model to measure intrarenal pressure with and without a ureteral access sheath (UAS) with various sizes and placement locations, irrigation methods, and working channel accessories. LVE pressure accuracy was measured in a bench model. This abstract shows the least-square means from multiway analysis of variances used for analysis. Results: Intrarenal pressures were the highest without a UAS (64 mm Hg), followed by the 11/13 UAS (51 mm Hg) and the 12/14 and 13/15, which were not statistically different (39-40 mm Hg). The pressures were highest with UASs placed at the ureteropelvic junction (61 mm Hg), and lowest if placed in the renal pelvis (24 mm Hg). Irrigation methods showed the highest pressures with syringe (57 mm Hg), while irrigation bags (pressurized at 150-300 mm Hg) produced 43 to 46 mm Hg and 25 mm Hg when applied with 80 cm of gravity. Placing a 200 μm laser fiber reduced pressures from 44 to 41 mm Hg. Finally, the bench model showed that LVE was 96% accurate up to 300 mm Hg. Conclusion: Intrarenal pressure significantly varied based on UAS sizes, placement, and irrigation methods. Accordingly, fURS with LVE is poised to be an invaluable tool for clinical decision-making and future studies of intrarenal pressure.

A sheath correction method for electron density measurements with the microwave resonant curling probe

A correction method accounting for plasma sheath effects that appear when performing an electron density measurement with a microwave resonant probe immersed in plasma is described. The diagnostic is the novel curling probe (CP) that has already shown promising capabilities in various plasma sources. The correction method is based on the evaluation of two effects relative to the resonant probe operation and its interface with the plasma. First, the characteristic decay length of the electromagnetic field emitted by the CP, which defines the probed volume, has been characterized for the different harmonic resonance modes. Second, a semi-analytical model has been adapted to describe the plasma structure forming near the probe, which quantitatively describes the electron density profiles across the sheath structure. The correction method is then developed uniquely from numerical simulations and is independent of other diagnostics. Experimental results inside two plasma sources, an inductively coupled plasma and an electron cyclotron resonance plasma thruster, are presented and discussed. The validity of the method is assessed (i) by comparing CP corrected densities with Langmuir probe results, (ii) by varying the probe orientation to the expanding plasma flow, and (iii) by using two harmonics of the probe. The method is shown to significantly improve the accuracy of electron density measurements. Possible improvements to the method are also discussed.

A Study on the Mechanism of Casing Deformation and Its Control Strategies in Shale Oil Hydraulic Fracturing

The problem of casing deformation caused by large-scale hydraulic fracturing in shale oil wells severely restricts the efficient development of Gulong shale oil. In order to clarify the mechanism of casing deformation in shale oil wells, comprehensive analysis was conducted on engineering factors, multi-arm caliper logging, seismic attributes, and the distribution characteristics of casing deformations. This study shows that casing strength, cementing quality, and wellbore curvature are not the main controlling factors for casing deformation. Casing deformation is caused by the communication between hydraulic fractures and natural fractures during the fracturing process, which increases the fluid pressure in the natural fracture and induces shear slip, resulting in casing deformation due to shear stress. Based on the understanding of the mechanism of casing deformation in shale oil wells, two targeted casing deformation prevention and control methods are proposed. First, temporary plugging was implemented during the hydraulic fracturing process when the fluid volume reached 1000 m3, and the pumping rate was reduced to below 16 m3/min to reduce the internal fluid pressure of the fractures and control fracture slip, thereby minimizing the risk of casing deformation. Second, hollow particles were added to the cement to enhance the consolidation effect of the cement sheath and mitigate casing deformation caused by fracture slip. Research indicates that a hollow particle content of 15% can meet the requirements for casing deformation control in Gulong shale oil. These research results can provide important references for the prediction and prevention of casing deformation risks in shale oil and similar unconventional reservoirs during hydraulic fracturing.

Effect of Plasma Sheaths on Earth-Entry Magnetohydrodynamics

The first study of the full coupling between the aerothermodynamics, the magnetohydrodynamics (MHD), and the plasma sheaths within Earth-entry flows is here performed. The problem addressed herein is representative of a force-generating MHD patch located between the stagnation point and the aft of a capsule entering the Earth’s atmosphere at Mach 34. The reactions are obtained from the Park chemical solver and the transport coefficients from the Gupta–Yos model with modifications. The physical model fully couples the drift–diffusion model for the sheaths to the multispecies Navier–Stokes equations for the plasma flow. The Hall and ion slip effects are taken into consideration within the plasma flow and within the sheaths. The effect of the electrode material on the MHD process is studied. Using thoriated tungsten instead of graphite leads to a thirtyfold increase in the Lorentz forces and also leads to significantly reduced heat fluxes on the cathode. This is attributed to the much higher electrical conductivity of the thoriated tungsten sheath reducing by orders of magnitude the plasma electrical resistance near the surfaces.

Effect of Vascular Bundles and Fiber Sheaths in Nodes and Internodes of Gigantochloa apus Bamboo Strips on Tensile Strength

Effect of Vascular Bundles and Fiber Sheaths in Nodes and Internodes of Gigantochloa apus Bamboo Strips on Tensile Strength

A finite element procedure for time-dependent radio-frequency sheaths based on a two-dimensional microscale fluid model

In this paper, we present a finite element scheme for the analysis of time-dependent radio-frequency (RF) sheath behavior in a plasma-filled domain bounded by periodically curved plates. This numerical scheme is based on a two-dimensional (2D) microscale model in which the time-dependent cold-ion fluid equations, the Maxwell–Boltzmann relation for electrons, and Poisson's equation are solved subject to periodic boundary conditions (BCs) and conducting-wall BCs. The continuity of the total current is employed in localized regions to provide a constraint on the reference sheath potential. The primary purpose of this work is to understand 2D dynamic sheath behavior in order to improve predictive capabilities for RF wave interactions in magnetic fusion experiments. In particular, this work treats cases where the local radius of curvature of the wall surface is comparable to the non-neutral sheath width. Using the developed numerical code, the dependences of the ion, electron, and displacement admittances on the wall bump height, ion magnetization, ion mobility, and the magnetic field angle are investigated. It is shown that the ion and electron admittances are nearly unchanged over wide ranges of the bump height and ion magnetization. In addition, the 2D sheath effects are assessed through the spatial distributions of various quantities such as the electron density, electrostatic potential, ion velocity, and surface wall current.

Anti-Inflammatory and Antioxidant Effects of Leaves and Sheath from Bamboo (Phyllostacys edulis J. Houz).

Bamboo (Phyllostacys edulis J. Houz) has become an emerging forest resource of economic and ecological significance with health benefits. Since the beneficial effects of the non-edible parts of bamboo have not been thoroughly explored, we characterized in this study bamboo leaf (BL) and sheath (BS) extracts. The total phenol and flavonoid content (TPC and TFC), antioxidant activity (ABTS, DPPH, FRAP and β-carotene bleaching test) and anti-inflammatory properties were determined. Leaves exhibited a TPC value of 73.92 mg equivalent (eq) gallic acid/g fresh weight (FW) and a TFC value of 56.75 mg eq quercetin/g FW. Ultra-High-Performance Liquid Chromatography (UHPLC) coupled with photo diode array detector (PDA) analysis revealed evidence for the presence of protocatechuic acid, isoorientin, orientin and isovitexin in BL, whereas BS was rich in phenolic acids. Both samples demonstrated a significant ability to scavenge radicals against ABTS·+, with an inhibitory concentration of 50% of 3.07 μg/mL for BL and 6.78 μg/mL for BS. At a concentration of 0.1 and 0.2 mg/mL, BS decreased reactive oxygen species production without hampering cell viability in HepG2 liver cells, while at the same concentrations, BL exhibited cytotoxicity in HepG2 cells. In addition, 0.1 and 0.2 mg/mL BS and BL reduced Interleukin-6 and Monocyte Chemoattractant Protein-1 production in human lipopolysaccharide-stimulated THP-1 macrophages, without affecting cell viability. These findings highlight the anti-inflammatory and antioxidant properties of BL and BS, corroborating their different potential applications in the nutraceutical, cosmetic and pharmaceutical industries.

The propagation characteristics of the return-stroke electric wave in consideration of corona sheath

The propagation characteristics of the return-stroke current wave along the channel are an important issue in lightning research. The temperature, electrical conductivity and radius of lightning dart‑leader channels were calculated based on spectral diagnosis. Using them as initial parameters the dispersion equation for electric wave propagating along the return-stroke channel in a wide angular frequency range was solved numerically. The dispersion relations for the electric wave with and without considering the corona sheath effect were investigated. The results showed that both the propagation velocity and amplitude of electric wave decay along the channel, and the high frequency components decay faster. The corona sheath hastens the attenuation of the electric wave. The peak current intensity is closely related to the physical characteristics of the leader channel and determines the propagation velocity and amplitude attenuation of electric wave. Inferred from the attenuation characteristics of the wave, the variation of the current intensity along the channel is mainly determined by the different attenuation rate of the harmonic components with different frequencies during the transmission process.