Results 11 to 20 of about 506,254 (285)
Use of Impulse Oscillometry in Patients with Chronic Obstructive Pulmonary Disease [PDF]
Thoracic Research and PracticeOBJECTIVE: Although spirometry is a standard diagnostic tool for obstructive lung diseases, it is rarely performed, and the quality of basic spirometry is low in many countries. The impulse oscillometry system (IOS) is a non-invasive method that requires
Burcu Öztürk Şahin, Nurdan Köktürk
doaj +2 more sources
Modeling of different tower grounding systems using hybrid continuous circuit-trapezoidal integration method [PDF]
Serbian Journal of Electrical Engineering, 2021 In order to protect the transmission lines against lightning strikes, it is important to investigate the tower grounding system. In this paper, a recent method called hybrid continuous circuit-trapezoidal integration method is used to calculate ...
Asadpourahmadchali Mohammadbagher +2 more
doaj +1 more source
Non-destructive characterisation of structural ceramics using impedance spectroscopy [PDF]
, 2001 This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.The aim of this project was to explore the potential applications of impedance spectroscopy (IS) in the non-destructive characterisation of structural ...
Wang, Xin
core +7 more sources
Energy Reports, 2022 This research assessed the transmission tower’s surge impedance before and after paralleling the overhead ground wire (OHGW) made of twisted galvanized steel cable from topmost of the transmission tower to the tower ground footage.
Chakkri Satchathampitak +2 more
doaj +1 more source
Evaluation principle and method of horizontal grounding electrode based on time‐varying impedance
IET Science, Measurement & Technology, 2021 The length of the horizontal grounding electrode is usually extended to decrease the impulse grounding resistance. In this paper, the mechanism for influencing the effective length is revealed by studying the dispersal process of a horizontal electrode ...
Xiaobin Cao +5 more
doaj +1 more source
On the Characterisations of the Impulse Breakdown in High Resistivity Soils by Field Testing
Energies, 2021 This paper presents experimental results of high-current impulse tests on six ground electrode configurations. A high impulse current generator is employed to inject different magnitudes of current into these rod electrodes, under both positive and ...
Abdul Wali Abdul Ali +1 more
doaj +1 more source
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 +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
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 +4 more
doaj
Energy Reports, 2022 Large-capacity impulse test of distribution transformer requires a large amount of instantaneous energy, while the impulse mode of conventional dedicated high-voltage line and generator requires synchronous switch, adjusted impedance, generator, etc ...
Bo Niu +4 more
doaj +1 more source