Results 91 to 100 of about 36,924 (279)

A D-band 180° phase shifter with very low amplitude- and phase-error

, 2022
S.174-177Phase shifters are at the heart of phased array systems which enable beam steering techniques. This paper presents a 180° digital phase shifter MMIC employing two SPDT switches which are realized in a 50nm metamorphic high electron mobility ...
Müller, D., Längst, J., Leuther, Arnulf, Kallfass, I., Zwick, T., Tessmann, Axel   +5 more
core   +1 more source

Photonics Based Microwave Hybrid Coupler With Tunable Coupling Ratio and Phase Difference

IEEE Photonics Journal, 2018
A new microwave hybrid coupler that solves the problems of limited bandwidth and reconfigurability in conventional couplers, is presented. It is based on a bi-directional operating optical phase modulator and an optical signal processor to control the ...
Yanliang Zhang, Erwin H. W. Chan, Xudong Wang, Xinhuan Feng, Bai-Ou Guan   +4 more
doaj   +1 more source

3D Printing Innovations in Polymeric Porous and Patterned Architecture

Advanced Functional Materials, EarlyView.
Polymeric foams occupy a unique structural space between dense solids and open networks, where engineered void fraction governs mechanical compliance, thermal resistance, and mass transport. Additive manufacturing now enables precise spatial control over cellular architecture, unlocking designer foam structures across applications spanning crash ...
Dhanush Patil, Sri Vaishnavi Thummalapalli, Clarissa Westover, Arunachalam Ramanathan, M. Taylor Sobzcak, Roumika Patil, Qixuan Xiang, Tiantian Li, Sui Yang, Timothy E. Long, Hongyue Sun, Xianqiao Wang, Yang Liu, Kenan Song   +13 more
wiley   +1 more source

Quantifying Subsurface Weak in‐Plane Magnetization of Mixed Phase BiFeO3 by Scanning Nitrogen Vacancy Magnetometry

Advanced Functional Materials, EarlyView.
We use scanning nitrogen vacancy magnetometry to directly image the weak in‐plane magnetic moments in mixed phase BiFeO3 at the nanoscale and quantify the local magnetic moments to be 18.8±2.0 μB/nm2 in the rhombohedral‐like phase and 1.5±0.6 μB/nm2 in the well‐known non‐magnetic tetragonal‐like phase.
Lei Wang, Zhewen Xu, Yuwen Xu, Björn Josteinsson, Simon Josephy, Dawei Zhang, Yunlong Sun, Heung‐Sik Park, Jihun Kim, Kanghyun Chu, Kyung Song, Danyang Wang, Chan‐Ho Yang, Andrea Morales, Jan Seidel   +14 more
wiley   +1 more source

An Accurate Three-Input Nonlinear Model for Joint Compensation of Frequency-Dependent I/Q Imbalance and Power Amplifier Distortion

IEEE Access, 2019
The analog front of the direct conversion transmitter suffers from the effects of various unavoidable nonlinearities, such as local oscillator (LO) leakage, power amplifier (PA) nonlinearities, and in-phase and quadrature (I/Q) branch amplitude and phase
Yao Yao, Yi Jin, Mingyu Li, Zhijiang Dai, Songbai He   +4 more
doaj   +1 more source

Vacuum Formed Spherical Triboelectric Architecture Overcoming Direction Constraints for 3D‐Omnidirectional Ultrasonic Energy Receiving

Advanced Functional Materials, EarlyView.
First vacuum formed spherical triboelectric converter for 3D‐omnidirectional ultrasonic energy receiving, with configurable DC or pulse outputs for versatile applications. ABSTRACT Ultrasound‐driven triboelectric nanogenerators (UD‐TENGs) have emerged as promising ultrasonic energy converters for underwater and biomedical applications.
Yanqin Huang, Mengjie Qin, Zixuan He, Xu Yang, Wenjie Chen, Siya Zhou, Qiyuan Zhang, Zhangwei Wang, Yicheng Wang, Yonghong Cheng, Daniel M. Mulvihill, Sandy Cochran, Qingshen Jing   +12 more
wiley   +1 more source

Wind Turbine Blade Imbalance Monitoring Using PMSG Electrical Signals

This paper presents a new fault diagnosis method of wind turbine (WT) blade mass imbalance and blade pitch imbalance using the electrical output signals of permanent magnet synchronous generator (PMSG) in a wind turbine. It extracts the tach signals from
Gu, Fengshou, Ball, Andrew D., Zou, Zhexiang, Li, Dongqin, Cao, Yanling, Zeng, Yang   +5 more
core   +1 more source

Large amplitude noise reduction in ultrashort pulse trains using a power-symmetric nonlinear optical loop mirror [PDF]

, 2009
We analyse numerically the capabilities of a power-symmetric nonlinear optical loop mirror (NOLM) in the ultrashort pulse regime for high-quality amplitude regeneration of an optical signal.
BALDEMAR IBARRA ESCAMILLA, EVGENY KUZIN
core  

Relationships Between Internal Voltage and Power Imbalance Illustrating Characteristics and Roles in System Dynamics of Inertia-Controlled DFIG-Based Wind Turbines

CSEE Journal of Power and Energy Systems
Frequency and voltage dynamics, as the focus of power systems, depend more and more on the frequency and amplitude response characteristics of renewable energy devices subjected to power imbalance.
Minhui Wan, Xiaoming Yuan, Jiabing Hu
doaj   +1 more source

Response of Aeroengine with Fusing Design Suffering FBO

International Journal of Aerospace Engineering, 2019
The loss of fan blades in an aeroengine, or fan-blade out (FBO), is a type of accident that causes a sudden imbalance and large impact load, which leads to complex vibration of a system.
Chi Ma, Wei Chen, Lulu Liu, Zhenhua Zhao, Gang Luo   +4 more
doaj   +1 more source