Results 71 to 80 of about 3,882,562 (249)

Determining acoustical directionality in an impedance tube using multiple fixed microphones [PDF]

, 2011
Acoustic impedance of a port or object is a valuable piece of knowledge describing how well sound is transmitted or reflected. The commonly used slotted-line method is labourious and time consuming, requiring manual movement to find the maxima and minima
Scott, Jonathan B., Pennington, Kyle, Bodman, Kerry   +2 more
core  

Hybrid Ferroelectric Tunnel Junctions with Intrinsic Nonlinearity and Self‐Rectification via Interfacial Reconstruction

Advanced Functional Materials, EarlyView.
Rapid thermal annealing reconstructs the BCFO/Nb:STO interface into an atomically thin reconstructed interfacial layer, which reshapes the tunneling barrier and converts a high‐TER ferroelectric tunnel junction into an intrinsically nonlinear, self‐rectifying device.
Hojin Lee, Joonbong Lee, Jinho Byun, Sang‐Hyeok Yang, A young Cho, Sangwoo Lee, Dae Haa Ryu, Hyunbin Chung, Hee Seo Yun, Moon Seop Choi, Yesul Choi, Sungkyun Park, Min‐Hyung Jung, Dongwon Lee, Yoon‐Uk Heo, Hu Young Jeong, Hongseok Kim, Shinhyeong Lee, Yunseok Kim, Young‐Min Kim, Jaekwang Lee, Taekjib Choi   +21 more
wiley   +1 more source

Coordinated Control of Parallel Three-Phase Four-Wire Converters in Autonomous AC Microgrids

CSEE Journal of Power and Energy Systems
The coordinated control of parallel three-phase four-wire converters in autonomous AC microgrids is investigated in this paper. First, based on droop control, virtual impedance is inserted in positive-, negative-and zero-sequences to enhance system ...
Rui Liu, Li Guo, Xialin Li
doaj   +1 more source

Virtual Impedance Analyzer Design and Implementation

, 2012
[[abstract]]In this research, the structure and design of virtual impedance analyzers are studied. The construction process is also described and introduced. This programmable virtual impedance analyzer is achieved by software part, Labview、hardware part,
Yao, Kai-chao; Liao, Chin-wen; Chao, Li-ling; Lin, Fu-yu
core  

Functional Electrical Impedance Tomography of adult and neonatal brain function. [PDF]

, 2006
Electrical Impedance Tomography (EIT) is a fast, portable imaging technique that produces tomographic images of the internal impedance of an object from surface electrode measurements.
Tidswell, A.T., Tidswell, Alexander Thomas   +1 more
core  

Bioinspired Adaptive Sensors: A Review on Current Developments in Theory and Application

Advanced Materials, EarlyView.
This review comprehensively summarizes the recent progress in the design and fabrication of sensory‐adaptation‐inspired devices and highlights their valuable applications in electronic skin, wearable electronics, and machine vision. The existing challenges and future directions are addressed in aspects such as device performance optimization ...
Guodong Gong, You Zhou, Qingxiu Li, Wenyu Zhao, Sunyingyue Geng, Hangfei Li, Yan‐Bing Leng, Shirui Zhu, Guanglong Ding, Yongbiao Zhai, Ziyu Lv, Ye Zhou, Su‐Ting Han   +12 more
wiley   +1 more source

Beyond Presumptions: Toward Mechanistic Clarity in Metal‐Free Carbon Catalysts for Electrochemical H2O2 Production via Data Science

Advanced Materials, EarlyView.
Metal‐free carbon catalysts enable the sustainable synthesis of hydrogen peroxide via two‐electron oxygen reduction; however, active site complexity continues to hinder reliable interpretation. This review critiques correlation‐based approaches and highlights the importance of orthogonal experimental designs, standardized catalyst passports ...
Dayu Zhu, Hsi‐wen Wu, Xiao Wang, Jie Zhang   +3 more
wiley   +1 more source

Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions

Energies, 2018
With plenty of parallel inverters connected to a weak grid at the point of common coupling (PCC), the impedance coupling interactions between the inverters and the grid are enhanced, which may cause high-frequency harmonic oscillation and further ...
Ling Yang, Yandong Chen, Hongliang Wang, An Luo, Kunshan Huai   +4 more
doaj   +1 more source

Self‐Assembled Monolayers in p–i–n Perovskite Solar Cells: Molecular Design, Interfacial Engineering, and Machine Learning–Accelerated Material Discovery

Advanced Materials, EarlyView.
This review highlights the role of self‐assembled monolayers (SAMs) in perovskite solar cells, covering molecular engineering, multifunctional interface regulation, machine learning (ML) accelerated discovery, advanced device architectures, and pathways toward scalable fabrication and commercialization for high‐efficiency and stable single‐junction and
Asmat Ullah, Ying Luo, Stefaan De Wolf
wiley   +1 more source

Power Control Strategy of Microgrid Based on Adaptive Virtual Impedance

Kongzhi Yu Xinxi Jishu, 2018
In order to balance the load power sharing, adding virtual impedance is a simple and effective way. It proposed a new control method based on multiple second-order generalized integrator (MSOGI) harmonic detection and adaptive virtual impedance, which ...
JIA Yaoqin, HU Changhua, HE Qiaohui
doaj