Results 31 to 40 of about 2,253,922 (294)

Modified Green's Functions for Shallow Water Acoustic Wave Propagation [PDF]

, 2004
This article presents an assessment of alternative forms of the Green’s function for boundary element simulations of acoustic wave propagation in shallow water. It is assumed that the problem is two-dimensional, the source of acoustic disturbance is time-
Santiago, J A F S, Wrobel, L C
core   +1 more source

Design of Low-Profile Frequency-Selective Rasorbers Based on Three-Legged Loaded Element

International Journal of Antennas and Propagation, 2020
A novel low-profile dual-polarization frequency-selective rasorber (FSR) with a transmissive window in the absorption band is proposed in this paper. Based on the equivalent circuit model (ECM), the principles of the impedance design are theoretically ...
Yu Qiang, Dongfang Zhou, Qikun Liu, Zhenning Yao   +3 more
doaj   +1 more source

Broadband electromagnetic wave absorption using pure carbon aerogel by synergistically modulating propagation path and carbonization degree

, 2023
Carbon materials were widely used as electromagnetic (EM) wave absorption due to their advantages of light weight, environmental resistance and high electrical conductivity.
Han, Mengjie, Xiaogang Su, Yanan Liu, Xu, He-Xiu, Yaqing Liu, Siqi Huo, Wang, Jun, Mengjie Han, Jun Wang, Liu, Yannan, Liu, Yaqing, Wu, Qilei, Zhang, Bin, Su, Xiaogang, Bin Zhang, Qilei Wu, He-Xiu Xu, Huo, Siqi   +17 more
core   +1 more source

Wave Parameter Inversion Based on Sea Clutter Characteristics

Remote Sensing
Accurate acquisition of wave parameters is important for marine monitoring and target identification. Traditional methods are limited in sea state adaptability, real-time observation, and inversion accuracy.
Xiao Li, Xin Li, Huaiyun Peng, Xinyu Xu, Chunzhi Hou   +4 more
doaj   +1 more source

Design of Tunable Equalizers Using Multilayered Half Mode Substrate Integrated Waveguide Structures Added Absorbing Pillars

Advances in Materials Science and Engineering, 2015
An equalizer based on multilayered half mode substrate integrated waveguide (HMSIW) structures with high Q-factor, low loss, and compact size is proposed for the first time.
Shuxing Wang, Yongfei Wang, Dewei Zhang, Yi Zhang, Dongfang Zhou   +4 more
doaj   +1 more source

Spread-F occurrences and relationships with foF2 and h′F at low- and mid-latitudes in China

Earth, Planets and Space, 2018
Ionospheric irregularities are an important phenomenon in scientific studies and applications of radio-wave propagation. Spread-F echoes in ionograms are a type of high-frequency band irregularities that include frequency spread-F (FSF), range spread-F ...
Ning Wang, Lixin Guo, Zhenwei Zhao, Zonghua Ding, Leke Lin   +4 more
doaj   +1 more source

Exploring Marine Atmospheric Ducts: Current Sensing and Emerging Trends

Remote Sensing
Tropospheric refraction significantly impacts the propagation of ultrashort- and microwave-frequency radio waves over marine environments. Atmospheric ducting, the most common super-refractive structure, allows radio waves to travel over the horizon ...
Jin-Peng Zhang, Yu-Jing Li, Han-Jie Ji, Huai-Yun Peng, Xiang-Ming Guo, Yu-Sheng Zhang   +5 more
doaj   +1 more source

Using Multilayered Substrate Integrated Waveguide to Design Microwave Gain Equalizer

Advances in Materials Science and Engineering, 2014
This paper presents the design and experiment of a novel microwave gain equalizer based on the substrate integrated waveguide (SIW) technique. The proposed equalizer is formed by an SIW loaded by SIW resonators, which has very compact structure and can ...
Yongfei Wang, Dongfang Zhou, Yi Zhang, Chaowen Chang   +3 more
doaj   +1 more source

Low attenuation microwave waveguides [PDF]

, 1974
PhDAn investigation of the dispersion and attenuation characteristics of cylindrical structures supporting guided electromagnetic waves with low attenuation is described.
Al-Hariri, Ali Mohammed Bakir
core   +2 more sources

The nature of electron density enhancement over a wide altitude range during ionosphere heating experiments at EISCAT

Earth and Planetary Physics
During the course of ionospheric heating experiments, researchers at the European Incoherent Scatter Scientific Association (EISCAT) observed an apparent electron density enhancement.
Jun Wu, Jian Wu, Jie Feng, QingLiang Li, ShuJi Hao, ZhengWen Xu, HaiSheng Zhao, YaBin Zhang   +7 more
doaj   +1 more source