Results 31 to 40 of about 33,835 (216)

Combination of Robust Algorithm and Head-Tracking for a Feedforward Active Headrest

Applied Sciences, 2019
Active headrest can reduce the low-frequency noise around ears based on the principle of active noise control. This paper presents a combination of robust algorithm and head-tracking for a feedforward active headrest to reduce the broadband noise for a ...
Rong Han, Ming Wu, Chen Gong, Shangshuai Jia, Tieli Han, Hongling Sun, Jun Yang   +6 more
doaj   +1 more source

Beyond the audible: the effects of broadband noise pollution on the development of an herbaceous and a woody plant

Frontiers in Ecology and Evolution
Although plants and microorganisms can respond to sound (mainly single frequency bands), the effects of anthropogenic noise—particularly broadband traffic noise—remain largely unexplored, especially when plants and soil microbial communities are ...
Valentina Zaffaroni-Caorsi, Sarah Caronni, Sofia Rocca, Lara Assunta Quaglini, Fabio Angelini, Emanuele Asnaghi, Sandra Citterio, Giovanni Zambon   +7 more
doaj   +1 more source

Active Noise Control Scheme for Smart Beds Based on a Wide and Narrow Band Hybrid Control Algorithm

IEEE Access, 2023
The importance of information intelligence in today’s society is growing as a result of advances in science and technology, and as intelligent technology is now a part of almost every aspect of people’s lives, demand for data collection ...
Guoqiang Lu, Renwen Chen, Hao Liu
doaj   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

Sub‐1 ms Optoelectronic Synapse Based on {ZnCdO/ZnO} Multilayer Structure for High‐Speed Neuromorphic Vision Systems

Advanced Functional Materials, EarlyView.
Eu‐doped {ZnCdO/ZnO} structures grown on Si are developed, showcasing dual‐functionality controlled by europium doping. While high europium concentration transforms the device into an ultrafast, self‐powered photodetector, low‐doped structures can be used as an optoelectronic synapse.
Igor Perlikowski, Eunika Zielony, Adrian Kaim, Ewa Przeździecka   +3 more
wiley   +1 more source

Instrument self-noise and sensor misalignment [PDF]

Advances in Geosciences, 2013
In this study we investigate self-noise of RefTekTM 151-60A "Observer" broadband seismometers (flat to velocity between 50 Hz down to T0=60 s, f0≈17 mHz) using the coherency analysis method introduced by Sleeman et al. (2006).
A. Gerner, G. Bokelmann
doaj   +1 more source

Self‐Powered, Ultra‐Sensitive InGaAs/ITO Nanowire Radial Junction Infrared Photodiode for Low Flux Imaging at Room Temperature

Advanced Functional Materials, EarlyView.
This study reports a self‐powered InGaAs nanowire photodetector achieving single‐photon‐level sensitivity in the shortwave infrared at non‐cryogenic temperatures. The device demonstrates high‐speed imaging capabilities even under extremely low‐flux conditions.
Kosala Dhanawansha, Chaohao Chen, Zhe Li, Tuomas Haggren, Dawei Liu, Yang Yu, Baolei Liu, Sanjay Krishna, Hark H. Tan, Chennupati Jagadish, Lan Fu   +10 more
wiley   +1 more source

Origin of broadband acoustic emission from a dancing cavitation bubble

Applied Physics Express
Acoustic cavitation generates bubbles exhibiting violent expansion and contraction under intense ultrasound in liquids. The acoustic emissions (AE) spectrum from cavitation bubbles contains harmonics, subharmonics, ultraharmonics, and broadband noise ...
Hyang-Bok Lee, Pak-Kon Choi
doaj   +1 more source

Experimental Study of Advanced Helmholtz Resonator Liners with Increased Acoustic Performance by Utilising Material Damping Effects

Applied Sciences, 2018
In aero engines, noise absorption is realised by acoustic liners, e.g., Helmholtz resonator (HR) liners, which often absorb sound only in a narrow frequency range.
Martin Dannemann, Michael Kucher, Eckart Kunze, Niels Modler, Karsten Knobloch, Lars Enghardt, Ennes Sarradj, Klaus Höschler   +7 more
doaj   +1 more source

Multidimensional‐Encoded High‐Fidelity Spectrometers With a Floating‐Base Bipolar Junction

Advanced Functional Materials, EarlyView.
A floating‐base bipolar junction photodetector enables multidimensional spectral encoding through synergistic gate‐ and drain‐bias modulation of interfacial barrier matching. The resulting complementary spectral responses form a diverse, weakly correlated response matrix, enabling robust and high‐fidelity spectral reconstruction even at sub‐nanoampere ...
Sang‐Hyeon Lee, Junho Min, Yonas Tsegaye Megra, Min‐Hye Jeong, Hwi Je Woo, Jaewon Han, Junheon Ha, Gyunghyun Jang, Young Jae Song, Hyun‐Soo Ra, Hoon Hahn Yoon, Jong‐Soo Lee   +11 more
wiley   +1 more source