|
|
|
|
|
Kaijun Song, Lele Fang and Yedi Zhou
In this paper, a novel kind of mode composite transmission line (MC-TL) is proposed, and a dual-band power divider with a large frequency ratio using this novel MC-TL for 5G communication systems was developed. The proposed MC-TL was developed using spoo...
ver más
|
|
|
|
|
|
|
|
|
|
|
Xiangdong Deng, Baolu Shi, Yong Tang and Ningfei Wang
The present study theoretically investigated the linear instability of a liquid film sheared by gas flow under acoustic oscillations. In this work, the velocity oscillations of the gas are used to approximately characterize the acoustic oscillations, and...
ver más
|
|
|
|
|
|
|
|
|
|
|
Franklin Drummond and Gregory Huff
An Unmanned Aerial System (UAS) has been developed which is based on an aerodynamically functionalized planar wideband antenna. The antenna utilizes a planar circular dipole metallization scheme. The aerodynamic structure implements a planform similar to...
ver más
|
|
|
|
|
|
|
|
|
|
|
Xiang Li, Qingchun Lei, Xiaocun Zhao, Wei Fan, Shuang Chen, Li Chen, Ye Tian and Quan Zhou
The combustion characteristics of a hydrogen-fueled supersonic combustor featuring a large cavity length-to-depth ratio (i.e., 11) were examined by performing experimental trials while varying the fuel injector positions and equivalence ratios. During th...
ver más
|
|
|
|
|
|
|
|
|
|
|
Anindita Paul, Jaime Ramirez-Angulo, Héctor Vázquez-Leal, Jesús Huerta-Chua and Alejandro Diaz-Sanchez
A highly power-efficient, fully differential Miller op-amp with accurately controlled output quiescent current is introduced. The op-amp can drive both capacitive and resistive load due to the presence of the auxiliary amplifier. This amplifier helps to ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Stathis C. Stiros
The advent of modern geodetic satellite techniques (GNSS, including GPS) permitted to observe dynamic deflections of bridges, initially of long flexible ones, and more recently of short, essentially stiff bridges with modal frequencies > 1 Hz, and with s...
ver más
|
|
|
|
|
|
|
|
|
|
|
Binghui Tang, Yuemin Wang, Ang Chen, Ruqing Gong and Yunwei Zhao
Pipeline systems are prone to defects due to the harsh service conditions, which may induce catastrophic failure if found not in time. Ultrasonic guided wave (UGW) testing provides a convenient option for pipeline detection, showing high-efficiency, non-...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jinrong Bao, Chenzhen Ji, Deng Pan, Chao Zong, Ziyang Zhang and Tong Zhu
The propagation mechanism of flow disturbance under acoustic excitations plays a crucial role in thermoacoustic instability, especially when considering the effect of non-premixed combustion on heat release due to reactant mixing and diffusion. This rela...
ver más
|
|
|
|
|
|
|
|
|
|
|
Fangfang Xu, Hong Li and Dongxu Zhang
The unstable combustion problem in small-sized solid rocket engines with a large aspect ratio is so complicated that its causes remain unclear. In this study, the coupled vibration between the sound field and shell in the engines was proposed as a possib...
ver más
|
|
|
|
|
|
|
|
|
|
|
Peng Liu, Nobuyoshi Kouguchi and Ying Li
Velocity is vital information for navigation and oceanic engineering. Coherent Doppler sonar is an accurate tool for velocity measurement, but its use is limited due to velocity ambiguity. Velocity measured by frequency shift has no velocity ambiguity, y...
ver más
|
|
|
|
|
|
|
|
|
|
|
Brahim Bakkas, Reda Benkhouya, Idriss Chana and Hussain Ben-Azza
Orthogonal frequency division multiplexing (OFDM) is the key technology used in high-speed communication systems. One of the major drawbacks of OFDM systems is the high peak-to-average power ratio (PAPR) of the transmitted signal. The transmitted signal ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Wang Cheng, Cao Yushi and Wang Weidong
In recent years, the constant-envelope orthogonal frequency-division multiplexing (CE-OFDM) has been considered as a candidate waveform in broadband satellite systems as it has a 0-dB peak-to-average power ratio (PAPR). However, the carrier frequency off...
ver más
|
|
|
|
|
|
|
|
|
|
|
Huayang Yu, Yihao Deng, Guansen Deng and Niya Dong
Fatigue failure in asphalt pavements, caused by continuous loading, primarily occurs at the interface between the asphalt binder and the aggregate (adhesive failure) or within the asphalt binder itself (cohesive failure). This study conducted variable st...
ver más
|
|
|
|
|
|
|
|
|
|
|
Qi Liu, Juanmian Lei, Yong Yu and Jintao Yin
Obvious aeroelastic deformation occurs in spinning projectiles with large slenderness ratio, which seriously affects flight stability and maneuverability. This paper investigates the aeroelastic response of spinning projectiles with large slenderness rat...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jonathan Miquel, Laurent Latorre and Simon Chamaillé-Jammes
Biologging refers to the use of animal-borne recording devices to study wildlife behavior. In the case of audio recording, such devices generate large amounts of data over several months, and thus require some level of processing automation for the raw d...
ver más
|
|
|
|
|
|
|
|
|
|
|
Panneerselvam Balaraman, Vijayaraj Stephen Joseph Raj and Veloorillom Madhavan Sreehari
High-speed aerospace applications, such as re-entry vehicles, mostly involve thin-walled structural components with a high strength-to-weight ratio and high-temperature resistant. The present novel work comprises the structural and thermal analysis of re...
ver más
|
|
|
|
|
|
|
|
|
|
|
Sunghyun So, Nakwon Jeong, Aran Song, Jungho Hwang, Daehae Kim and Changyeop Lee
It is important to monitor the temperature and H2O concentration in a large combustion environment in order to improve combustion (and thermal) efficiency and reduce harmful combustion emissions. However, it is difficult to simultaneously measure both in...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jifeng Jin, Lin Shang, Zijian Yang, Haiwang Wang and Guotong Li
Satellite networks show the development trend in global coverage, flexible access, and reliable transmission. They are the key to building a wide coverage, massive connection, three-dimensional, all-round, all-weather, space-, air- and ground-integrated ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Luigi Lombardi, Gianvito Matarrese and Cristoforo Marzocca
The quartz tuning fork used as an acoustic sensor in quartz-enhanced photo-acoustic spectroscopy gas detection systems is usually read out by means of a transimpedance preamplifier based on a low-noise operational amplifier closed in a feedback loop. The...
ver más
|
|
|
|
|
|
|
|
|
|
|
Qingsheng Meng, Yang Li, Wenjing Wang, Yuhong Chen and Shilin Wang
Silt liquefaction can occur due to the rapid cyclic loading of sediments. This can result in the loss of the bearing capacity of the underlying sediments and damage to the foundations and infrastructure. Therefore, assessing liquefaction hazards is an im...
ver más
|
|
|
|
|
|