Results 21 to 30 of about 101,437 (150)

Noise Pollution; Assessing and Control in the Beet Sugar Industry [PDF]

Egyptian Sugar Journal, 2020
Protection of the expertise workers in the Sugar production is essential for the sustainability and development of this strategic national industry. Noise pollution is a physical factor that may have negative effects on the employees.
Mohamed Mohamed, Mohamed Mahmoud Hafez, Ragab Rabeiy, Essam El Nagreedy   +3 more
doaj   +1 more source

Noise Characterization of All-Silicon Avalanche Photodetectors Operating at 1550 nm

IEEE Photonics Journal
In this work, we characterize the noise associated with the operation of all-silicon avalanche photodetectors integrated on a silicon-on-insulator platform, designed to operate at 1550 nm.
Yanran Xie, Ranjan Das, Andrew P. Knights   +2 more
doaj   +1 more source

Noise Analysis in Pre-Amplifier Circuits Associated to Highly Sensitive Optically-Pumped Magnetometers for Geomagnetic Applications

Applied Sciences, 2020
This paper analyzes the noise sources in photoelectric detection circuits with several low-noise operational amplifiers cores. The fabricated circuits are low-noise pre-amplifiers that are used for optically pumped magnetometers. In the proposed circuits,
Leisong Liu, Yuantian Lu, Xin Zhuang, Qunying Zhang, Guangyou Fang   +4 more
doaj   +1 more source

Ultra-sensitive heterodyne detection at room temperature in the atmospheric windows

Nanophotonics
We report room temperature heterodyne detection of a quantum cascade laser beaten with a local oscillator on a unipolar quantum photodetector in two different atmospheric windows, at 4.8 µm and 9 µm.
Saemian Mohammadreza, Del Balzo Livia, Gacemi Djamal, Todorov Yanko, Rodriguez Etienne, Lopez Olivier, Darquié Benoit, Li Lianhe, Davies Alexander Giles, Linfield Edmund, Vasanelli Angela, Sirtori Carlo   +11 more
doaj   +1 more source

Power-based application of frequency-averaged 𝓁1-norm regularisation technique for the synthesis of accelerating indoor tyre pass-by noise

Acta Acustica, 2021
Pass-by noise contribution analysis is an engineering procedure employed to estimate the contributions from various noise sources on a vehicle to the overall sound pressure level.
Papaioannou Athanasios, Elliott Stephen J., Cheer Jordan, Cuenca Jacques, Alkmim Mansour   +4 more
doaj   +1 more source

Analysis and Selection of the Optimal Pump Laser Power Density for SERF Co-Magnetometer Used in Rotation Sensing

Photonics
This paper systematically studies the output noise model of the K-Rb-21Ne co-magnetometer and proposes the method for determining the optimal pump laser power density.
Kai Zhang, Linlin Yuan, Ze Cai, Hang Gao, Rui Wang, Pengcheng Du, Xinxiu Zhou   +6 more
doaj   +1 more source

Low‐noise readout circuit for thermo‐electrical cooler‐less uncooled microbolometer infrared imager

Electronics Letters, 2016
A low‐noise analogue frontend readout circuit is presented for VOx microbolometer infrared imager without thermo‐electrical cooler. A modified differential mirror structure with substrate temperature and self‐heating effect compensation ability is used ...
Dahe Liu, Wengao Lu, Shuyu Lei, Zhongjian Chen   +3 more
doaj   +1 more source

Surrogate Based Optimization of Aerodynamic Noise for Streamlined Shape of High Speed Trains

Applied Sciences, 2017
Aerodynamic noise increases with the sixth power of the running speed. As the speed increases, aerodynamic noise becomes predominant and begins to be the main noise source at a certain high speed.
Zhenxu Sun, Ye Zhang, Guowei Yang
doaj   +1 more source

Equivalent Self-Noise Suppression of Distributed Hydroacoustic Sensing System Using SDM Signals Based on Multi-Core Fiber

Sensors
To address the demand of equivalent self-noise suppression in a distributed hydroacoustic sensing system, this study proposes a method to enhance the acoustic sensitivity and signal-to-noise ratio (SNR) using space division multiplexed (SDM) technology ...
Jiabei Wang, Hongcan Gu, Peng Wang, Gaofei Yao, Junbin Huang, Wen Liu, Dan Xu, Su Wu   +7 more
doaj   +1 more source

Hemispherical lens integrated room temperature ultra-broadband GaAs HEMT terahertz detector

Frontiers in Physics, 2023
Terahertz (THz) detection has been extensively studied in the application fields of wireless communication, non-destructive imaging and spectrum inspection, etc., in the decades.
Chenyu Yao, Chenyu Yao, Mengjie Jiang, Dong Wang, Libo Zhang, Libo Zhang, Ning Zhang, Lin Wang, Xiaoshuang Chen   +8 more
doaj   +1 more source