Results 11 to 20 of about 2,710 (218)

An Ultrasonic-Based Detection of Air-Leakage for the Unclosed Components of Aircraft

Aerospace, 2021
Air-leakage detection is among the most important processes at the assembly stage of unclosed components, especially for large aircraft. A series of air-leakage detecting methods are generally applied during the final assembly, nevertheless, many of them
Yanlin Lyu, Muhammad Jamil, Pengfei Ma, Ning He, Munish Kumar Gupta, Aqib Mashood Khan, Danil Yurievich Pimenov   +6 more
doaj   +1 more source

Experimental study on effect of freezing time of liquid CO2 on pore structure of coal

Meikuang Anquan, 2022
In order to promote gas drainage in low-permeability coal seams, implement the optimization of enhancing permeability and promoting gas drainage technology by liquid CO2 injection into freeze-thaw cracked coal seams, taking Changcun Coal Mine as the ...
ZHANG Huifeng
doaj   +1 more source

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
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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

The ultrasonic detection of an isolated craniosynostosis [PDF]

Prenatal Diagnosis, 1995
AbstractThe prenatal detection of scaphocephaly, an isolated form of craniosynostosis, is presented. The diagnosis was made at 34 weeks of gestation in a woman with polyhydramnios. The ultrasound appearance and postnatal follow‐up are presented.
L I, van der Ham, T E, Cohen-Overbeek, H D, Paz y Geuze, C, Vermeij-Keers   +3 more
openaire   +2 more sources

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
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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
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Ultrasonic Detection of Cavitation at Catheter Tips [PDF]

The Journal of the Acoustical Society of America, 1969
To assist in the identification of inner heart structures during ultrasonic cardiac diagnosis, various liquids have been injected through catheters into heart chambers. Each injection produces a cloud of ultrasonic echoes within the blood-filled catheterized chamber.
F W, Kremkau, R, Gramiak, E L, Carstensen, P M, Shah, D H, Kramer   +4 more
openaire   +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

Online visual monitoring and ultrasonic feedback detection in the ultrasonic precision bonding of polymers

Advanced Composites Letters, 2020
Ultrasonic bonding is a convenient bonding technology, which features sufficient cleanliness, high efficiency, no need for additional bonding aids, and other outstanding advantages. In recent years, it has been introduced into the field of the micro–nano
Yibo Sun, Yuqi Feng, Pengfei Hu, Xing Zhao, Xinhua Yang, Guoxiong Wu   +5 more
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