Results 11 to 20 of about 799,107 (315)

Respiratory system impedance in different decubitus evaluated by impulse oscillometry in individuals with obesity.

PLoS ONE, 2023
Background and objectiveThe body posture can influence gas exchange, respiratory mechanics, and mucociliary clearance and different positions can be used as a therapeutic strategy to improve in gas exchange and can also help physiotherapists to assist ...
Mayara Holtz, Larissa Perossi, Jéssica Perossi, Daniele Oliveira Dos Santos, Hugo Celso Dutra de Souza, Ada Clarice Gastaldi   +5 more
doaj   +3 more sources

Research on impulse impedance model and protection optimization of transmission tower grounding device in mountainous area

IET Science, Measurement & Technology, 2021
The impulse impedance of the tower is the core parameter to evaluate the lightning protection performance of the transmission line. The high soil resistivity and the underground rock layers in the mountainous areas will induce large impulse impedance and
Lin Huang, Lijun Zhou, Dong Zhang, Dongyang Wang, Weifu Gu, Sixiang Chen   +5 more
doaj   +2 more sources

Impulse Characteristics of Highly Wetted Soils [PDF]

Journal of Electrical and Electronics Engineering, 2023
It has been well accepted that under high impulse conditions, ionisation process in soil would occur, causing the ground resistance value to fall to a lower value than that obtained at low voltage low current, RDC.
REFFIN Muhd Shahirad, MOHAMAD NOR Normiza, ABDUL RAHMAN Nurul Azlina, ABDULLAH Noradlina Abdullah, HATTA Norhasliza   +4 more
doaj   +2 more sources

Reference values of respiratory impedance with impulse oscillometry in healthy Chinese adults [PDF]

Journal of Thoracic Disease, 2020
Abstract Background: Impulse oscillometry (IOS) is a non-invasive pulmonary function test for measuring respiratory impedance. Available reference equations of IOS indices for adults are limited. The aim of this study was to develop reference equations of IOS indices for Chinese adults.Methods: In a multicentral, cross-sessional study of ...
Xiaolin Liang, Yi Gao, Weijie Guan, Jing Du, Li Chen, Wen Han, Jinming Liu, Yong Lu, Yi Peng, Bingrong Zhao, Tao wang, Jinping Zheng   +11 more
openaire   +3 more sources

High current field test of impulse transient characteristics of substation grounding grid

The Journal of Engineering, 2018
It is significant to research the impulse characteristics of substation grounding grid for its optimal design and safe and stable operation. In order to obtain the impulse transient characteristics of substation grounding grid under lightning impulse ...
Xuefang Tong, Xiaohui Dong, Bo Tan
doaj   +2 more sources

Impulse Characteristics of Soil Treated with Enhancement Materials and Various Moisture Contents

Applied Sciences
Due to the high mineral contents of additives and enhancement materials (EMs), EMs have become popular in treating soil, which expectedly improves the electrical characteristics of soil.
Usman Muhammad, Fazlul Aman, Normiza Mohamad Nor   +2 more
doaj   +2 more sources

Validation of numerical simulations and experiments on impulse characteristics induced by self-excited oscillation

Scientific Reports
The high-frequency pulse flow, equivalent to the natural frequency of rocks, is generated by a self-excited oscillating cavity to achieve resonance rock-breaking.
Qiang Wu, Guodong Ji, Jian Zhao, Liudang Sun, Dapeng Han, Li Liu, Huaigang Hu, Jinping Yu, Changchang Chen, Yuqi Sun, Jinyong Guo   +10 more
doaj   +2 more sources

NON-DESTRUCTIVE ON-FIELD DETERMINATION OF PINEAPPLE (Ananas comosus L.) MATURITY USING ACOUSTIC IMPULSE IMPEDANCE TECHNIQUE

Central Mindanao University Journal of Science, 2021
Acoustic impulse impedance technique, pineapple maturity, non-destructive maturity ...
A. Llaban, Roejae Carlo Ang
semanticscholar   +1 more source

Measurement and analysis of impulse grounding impedance of tower grounding device subjected to artificial lightning M‐component

IET Generation, Transmission & Distribution, 2023
The impulse grounding impedance of tower grounding device is one of the important factors in the lightning protection evaluation of transmission line. The impulse characteristic test of the actual tower grounding device under lightning was rarely carried
Yi Zhang, Hansheng Cai, Ruihan Qi, Taishan Hu, Lei Jia, Gang Liu, Yongcong Wu, Shangmao Hu   +7 more
doaj   +1 more source

Review: Factors Affecting the Performance of Ground Electrodes under High Impulse Currents

Energies, 2023
Most studies have observed that the impedance values of ground electrodes under high impulse conditions (Zimp) are lower than the resistance values under steady-state conditions (RDC).
Normiza Mohamad Nor
doaj   +1 more source