Results 11 to 20 of about 242,502 (308)

Defect Recognition in Concrete Ultrasonic Detection Based on Wavelet Packet Transform and Stochastic Configuration Networks

IEEE Access, 2021
Aiming to detect concrete defects, we propose a new identification method based on stochastic configuration networks. The presented model has been trained by time-domain and frequency-domain features which are extracted from filtering and decomposing ...
Jinhui Zhao, Tianyu Hu, Ruifang Zheng, Penghui Ba, Congli Mei, Qichun Zhang   +5 more
doaj   +1 more source

Sprayer boom height measurement in wheat field using ultrasonic sensor: An exploratory study

Frontiers in Plant Science, 2022
In order to explore the influencing factors and laws of ultrasonic sensor detecting wheat canopy height, designed an ultrasonic sensor detection height test platform with speed adjustable function.
Xueguan Zhao, Changyuan Zhai, Changyuan Zhai, Songlin Wang, Hanjie Dou, Hanjie Dou, Shuo Yang, Shuo Yang, Xiu Wang, Lipin Chen, Lipin Chen   +10 more
doaj   +1 more source

M-SAC-VLADNet: A Multi-Path Deep Feature Coding Model for Visual Classification

Entropy, 2018
Vector of locally aggregated descriptor (VLAD) coding has become an efficient feature coding model for retrieval and classification. In some recent works, the VLAD coding method is extended to a deep feature coding model which is called NetVLAD.
Boheng Chen, Jie Li, Gang Wei, Biyun Ma
doaj   +1 more source

Distribution of Nonmetallic Inclusions in Slab for Tinplate

Metals, 2022
Tinplate is widely used in food packaging and chemical packaging. Industrial production continues to reduce the thickness of tinplate steel, which puts higher requirements on the control of inclusions.
Zhiying Mo, Zhendong Wang, Rudong Wang, Zhengzhi Zhao, Yuan Fang, Haixu Li, Yanzhao Luo, Shaojun Wang, Heng Cui   +8 more
doaj   +1 more source

Venting in the comparative study of flexural ultrasonic transducers to improve resilience at elevated environmental pressure levels [PDF]

, 2020
The classical form of a flexural ultrasonic transducer is a piezoelectric ceramic disc bonded to a circular metallic membrane. This ceramic induces vibration modes of the membrane for the generation and detection of ultrasound.
Dixon, Steve M., Feeney, Andrew, Kang, Lei, Somerset, William   +3 more
core   +2 more sources

Evolution Behavior and Closure Mechanism of Porosity in Large Billet during the Reduction Pretreatment

Metals, 2022
The reduction pretreatment process was proposed to be applied to large billets for the purpose of alleviating the center porosities and reducing the rolling ratio.
Yang Liu, Jianhua Liu, Yang He
doaj   +1 more source

Research on Rail Flaw Echo Accurate Location Method Based on Interface Wave Tracking Technology

Kongzhi Yu Xinxi Jishu, 2023
In the calculation of rail flaw echo location, the rail flaw location is related to the ultrasonic propagation time in rail. The more accurate the extracted propagation time, the more accurate the rail flaw location calculation.
XIA Lang, CAO Jingwei, WANG Pin, LI Hongliang   +3 more
doaj   +3 more sources

An Ultrasonic Sensor for Distance Measurement in Automotive Applications [PDF]

, 2001
This paper describes an ultrasonic sensor that is able to measure the distance from the ground of selected points of a motor vehicle. The sensor is based on the measurement of the time of flight of an ultrasonic pulse, which is reflected by the ground. A
Carullo, Alessio, Parvis, Marco
core   +1 more source

Implementation of ultrasonic sensing for high resolution measurement of binary gas mixture fractions [PDF]

, 2014
We describe an ultrasonic instrument for continuous real-time analysis of the fractional mixture of a binary gas system. The instrument is particularly well suited to measurement of leaks of a high molecular weight gas into a system that is nominally ...
Bates, Richard, Battistin, Michele, Berry, Stephane, Bitadze, Alexander, Bonneau, Pierre, Bousson, Nicolas, Boyd, George, Bozza, Gennaro, Brookhaven National Lab. (BNL), Upton, NY (United States), Crespo-Lopez, Olivier, Da Riva, Enrico, Degeorge, Cyril, Deterre, Cecile, DiGirolamo, Beniamino, Doubek, Martin, Favre, Gilles, Godlewski, Jan, Hallewell, Gregory, Hasib, Ahmed, Katunin, Sergey, Langevin, Nicolas, Lombard, David, Lombard, Didier, Mathieu, Michel, McMahon, Stephen, Nagai, Koichi, Pearson, Benjamin, Robinson, David, Rossi, Cecilia, Rozanov, Alexandre, Strauss, Michael, Vacek, Vaclav, Vitek, Michal, Zwalinski, Lukasz   +33 more
core   +2 more sources

Sensitivity-Improved Ultrasonic Sensor for 3D Imaging of Seismic Physical Model Using a Compact Microcavity

Sensors, 2018
A sensitivity-improved ultrasonic sensor is proposed and demonstrated experimentally in this present study. The device is comprised only a fiber-optic microcavity that is formed by discharging a short section of hollow core fiber (HCF).
Tingting Gang, Manli Hu, Xiaohong Bai, Qiangzhou Rong   +3 more
doaj   +1 more source