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32,341 result(s) for "Electric waves"
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Low-intensity extracorporeal shock wave therapy for Peyronie's disease: a single-center experience
The aim of this article is to assess the outcomes of a low-intensity extracorporeal shock wave therapy (LiESWT) protocol for the treatment of Peyronie's disease (PD). Patients treated for PD were prospectively recorded, and data were retrospectively reviewed. Age, characteristics of fibrous plaques, concomitant treatments, International Index of Erectile Function (IIEF-5), Lue score, and pain score on Likert scale were collected. Patients in acute phase of PD and an angulation of <40° were included. The protocol consisted of 6 weekly sessions of 4000 pulses each, applied from different directions, with a maximal power of 20 W and 8 Hz frequency. We included 39 patients (median age: 56.8 years, interquartile range [IQR]: 35.8-62.2 years). The median number of sessions received per patient was 7.2. After treatment, the median Lue score decreased from 6.8 initially to 3.3 (P = 0.003), the median Likert pain score dropped from 1.8 to 0.7 (P = 0.004), the median plaque size was reduced from 2 cm to 1.2 cm (P = 0.08), and the median penile curvature diminished from 31° to 17° (P = 0.07). On univariate and multivariate analysis, the only predictors of success were younger age (odds ratio [OR] = 0.95, P = 0.03 and OR = 0.91, P = 0.04, respectively) and concomitant use of phosphodiesterase-5 inhibitors (PDE5i; OR = 0.92, P = 0.02 and OR = 0.93, P = 0.01, respectively). LiESWT had a favorable impact on Lue score and notably penile pain, curvature, plaque size, and erectile function in patients treated for PD during the early inflammatory phase, with no side effects. Younger age and concomitant use of PDE5i were the only success predictors.
Preparation of three-dimensional multilayer flower-like structured MoS.sub.2/RGO composites with enhanced microwave absorption
To address the issue of electromagnetic radiation, it was essential to create a thin, lightweight absorber that possesses a broad bandwidth and superior absorption capabilities. In this study, MoS.sub.2/RGO composites with three-dimensional multilayer flower-like structures were synthesized by hydrothermal method with graphene oxide (GO). Effect of hydrothermal temperature, hydrothermal time and GO introduction on structure and microwave absorption of MoS.sub.2/RGO composites were investigated. The results indicated that the optimum conditions for hydrothermal growth of MoS.sub.2/RGO were determined to be hydrothermal temperature of 220 °C and hydrothermal time of 12 h. Additionally, the suitable introduction of GO was found to be 40wt%. The synthesized MoS.sub.2/RGO composites exhibited excellent microwave absorbing property with reflection loss of -50.11 dB at 8.96 GHz benefiting from its complex flower-like structure. The effective absorption bandwidth was up to 3.62 GHz (7.61-11.23 GHz), when the filler ratio was only 15 wt%. Potential absorption mechanism was proposed that the cooperation of the interfacial polarization, impedance matching, and dielectric losses was caused by the synergistic effects among RGO and MoS.sub.2. This work offered an efficacious reference idea for the device of novel and significant wave absorbers.
Design and synthesis of core-shell porous magnetic nanospindle@poly
The development of advanced microwave absorbing materials with high absorption intensity and broad bandwidth is crucial for applications in electromagnetic interference shielding and stealth technology. In this study, we propose a novel hybrid material composed of porous magnetic nanospindle@poly(3,4-ethylenedioxythiophene) (PEDOT)/MXene (Fe@P/MX), designed to achieve superior microwave absorption performance through impedance matching and electromagnetic loss mechanisms. The conductive PEDOT and MXene, combined with magnetic nanospindles, enable impedance matching and promote dielectric loss, which ultimately enhances microwave absorption. Additionally, the hybrid material contains multiple interfaces that induce interface polarization and strong absorption of electromagnetic waves. Electromagnetic parameters of composites can be easily modulated by adjusting the content of PEDOT, thereby optimizing microwave absorption performance. The results demonstrate improved performance compared to existing materials, with the minimum reflection loss of - 60.6 dB at 17.0 GHz under the thickness of 1.6 mm. Besides, the effective absorption bandwidth extends to 5.4 GHz under the thickness of 1.9 mm. This core-shell hybrid material has significant potential for practical applications requiring efficient microwave absorption.
Constructing Built-In Electric Fields with Semiconductor Junctions and Schottky Junctions Based on Mo–MXene/Mo–Metal Sulfides for Electromagnetic Response
HighlightsMo–MXene/Mo–metal sulfides with semiconductor junctions and Mott–Schottky junctions are designed.Built-in electric field are constructed in semiconductor–semiconductor–metal heterostructure, enhancing dielectric polarization and impedance matching.Density functional theory calculations and Radar cross-section simulations confirmed the excellent electromagnetic wave absorption ability of heterostructures.The exploration of novel multivariate heterostructures has emerged as a pivotal strategy for developing high-performance electromagnetic wave (EMW) absorption materials. However, the loss mechanism in traditional heterostructures is relatively simple, guided by empirical observations, and is not monotonous. In this work, we presented a novel semiconductor–semiconductor–metal heterostructure system, Mo–MXene/Mo–metal sulfides (metal = Sn, Fe, Mn, Co, Ni, Zn, and Cu), including semiconductor junctions and Mott–Schottky junctions. By skillfully combining these distinct functional components (Mo–MXene, MoS2, metal sulfides), we can engineer a multiple heterogeneous interface with superior absorption capabilities, broad effective absorption bandwidths, and ultrathin matching thickness. The successful establishment of semiconductor–semiconductor–metal heterostructures gives rise to a built-in electric field that intensifies electron transfer, as confirmed by density functional theory, which collaborates with multiple dielectric polarization mechanisms to substantially amplify EMW absorption. We detailed a successful synthesis of a series of Mo–MXene/Mo–metal sulfides featuring both semiconductor–semiconductor and semiconductor–metal interfaces. The achievements were most pronounced in Mo–MXene/Mo–Sn sulfide, which achieved remarkable reflection loss values of − 70.6 dB at a matching thickness of only 1.885 mm. Radar cross-section calculations indicate that these MXene/Mo–metal sulfides have tremendous potential in practical military stealth technology. This work marks a departure from conventional component design limitations and presents a novel pathway for the creation of advanced MXene-based composites with potent EMW absorption capabilities.
One-Dimensional Magnetic FeCoNi Alloy Toward Low-Frequency Electromagnetic Wave Absorption
HighlightsA novel FeCoNi carbon fiber (FeCoNi/CF) is obtained through an improved electrospinning technology, which greatly endows the fiber with strong magnetic property.The FeCoNi/CF exhibits an enhanced electromagnetic loss capability due to the construction of one-dimensional magnetic FeCoNi alloy.The designed one-dimensional FeCoNi/CF exhibits excellent performance, with a broad effective absorption band of 1.3 GHz in the low-frequency electromagnetic field at an ultrathin thickness of 2 mm, which provides a great potential for practical application in the future.Rational designing of one-dimensional (1D) magnetic alloy to facilitate electromagnetic (EM) wave attenuation capability in low-frequency (2–6 GHz) microwave absorption field is highly desired but remains a significant challenge. In this study, a composite EM wave absorber made of a FeCoNi medium-entropy alloy embedded in a 1D carbon matrix framework is rationally designed through an improved electrospinning method. The 1D-shaped FeCoNi alloy embedded composite demonstrates the high-density and continuous magnetic network using off-axis electronic holography technique, indicating the excellent magnetic loss ability under an external EM field. Then, the in-depth analysis shows that many factors, including 1D anisotropy and intrinsic physical features of the magnetic medium-entropy alloy, primarily contribute to the enhanced EM wave absorption performance. Therefore, the fabricated EM wave absorber shows an increasing effective absorption band of 1.3 GHz in the low-frequency electromagnetic field at an ultrathin thickness of 2 mm. Thus, this study opens up a new method for the design and preparation of high-performance 1D magnetic EM absorbers.
Study on the electromagnetic wave absorption performance of Ti.sub.3C.sub.2 MXene with different etching states
In this paper, a safe, low-cost and simple operating LiF + HCl etching method combined with freeze-drying was used to prepare Ti.sub.3C.sub.2T.sub.X MXene with different etching states. The results indicated that the morphology of Ti.sub.3C.sub.2T.sub.X gradually changed from stacked to accordion structure and finally to ultra-thin dispersed sheets with increasing etching. We also investigated different surface functionalization and electromagnetic properties of synthesized samples. In 2-18 GHz, the effective absorption bandwidth (EAB) (RL < - 10 dB) of the sample with accordion microstructure reaches 3.92 GHz at thickness of 1.27 mm, while for the ultra-thin dispersed Ti.sub.3C.sub.2T.sub.X sheets, the EAB is increased to 4.40 GHz at thickness of 1.26 mm. To our knowledge, this is the minimum thickness in Ti.sub.3C.sub.2-related reports. We attribute the improved wave absorption performance to the dielectric and magnetic loss induced by termination layer as well as the unique interface effects, which are also beneficial to optimize the impedance matching and achieve multi-mode attenuation even in high frequency band.
High-order harmonic generation in laser plasma plumes
This book represents the first comprehensive treatment of high-order harmonic generation in laser-produced plumes, covering the principles, past and present experimental status and important applications. It shows how this method of frequency conversion of laser radiation towards the extreme ultraviolet range matured over the course of multiple studies and demonstrated new approaches in the generation of strong coherent short-wavelength radiation for various applications. Significant discoveries and pioneering contributions of researchers in this field carried out in various laser scientific centers worldwide are included in this first attempt to describe the important findings in this area of nonlinear spectroscopy.