Results 21 to 30 of about 507,617 (286)

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

Back flashover mitigation for transmission tower by parallel additional multiple conductors from tower top to ground footage to alter the surge impedance

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, Rongrit Chatthaworn, Amnart Suksri   +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, Ming Wei, Manxiang Wang, Jiacai Liu, Ruifang Li, Lin Yang   +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, Normiza Mohamad Nor   +1 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, MOHAMAD NOR Normiza, ABDUL RAHMAN Nurul Azlina, ABDULLAH Noradlina Abdullah, HATTA Norhasliza   +4 more
doaj  

Research on large-capacity impulse test technology for distribution transformer based on energy storage intelligent power

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, Xutao Wu, Jiaying Yu, Hong Wu, Weifeng Liu   +4 more
doaj   +1 more source

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   +1 more source

Reference values of impulse oscillometric lung function indices in adults of advanced age. [PDF]

, 2013
Impulse oscillometry (IOS) is a non-demanding lung function test. Its diagnostic use may be particularly useful in patients of advanced age with physical or mental limitations unable to perform spirometry.
Wichmann, Heinz-Erich, Rudolf A. Jörres, Margit Heier, Rudolf A. Jörres (340115), Behr, Jürgen, Holle, R., H.-Erich Wichmann (72009), H.-Erich Wichmann, Karrasch, S., Huber, R.M., Wichmann, H.-E., Rolf Holle, Rudolf M. Huber (412835), Nowak, Dennis, Peters, Annette, Joachim Heinrich (60421), Stefan Karrasch, Rudolf A Jörres, Rolf Holle (262610), KORA Study Group, Annette Peters (62601), Schulz, H., Holle, Rolf, Heier, M., Karrasch, Stefan, Annette Peters, Jürgen Behr (272687), Nowak, D., Holger Schulz, Dennis Nowak, Schulz, Holger, Peters, A., Huber, Rudolf M., Joachim Heinrich, Claudia Flexeder, Heinrich, Joachim, Rudolf M. Huber, H-Erich Wichmann, Claudia Flexeder (412834), Dennis Nowak (412836), Jürgen Behr, Heinrich, J., Rudolf M Huber, Margit Heier (200535), Watz, Henrik, Flexeder, Claudia, Behr, J., Flexeder, C., Stefan Karrasch (412837), Holger Schulz (13022), Jörres, R.A., Heier, Margit, Jörres, Rudolf A., Wichmann, H.-Erich   +53 more
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Impedance Control for a Free-Floating Robot in the Grasping of a Tumbling Target with Parameter Uncertainty [PDF]

, 2006
This paper addresses an impedance control for free-floating space robot in the grasping of a tumbling target with model uncertainty. Firstly, the operational space dynamics for a free-floating robot is derived with a novel, computationally efficient ...
Abiko, Satoko, Lampariello, Roberto, Gerd Hirzinger, Satoko Abiko, Roberto Lampariello, Hirzinger, Gerhard   +5 more
core   +1 more source