Results 281 to 290 of about 22,474,821 (353)

Surface impedance models for high impedance surfaces

Applied Physics A, 2011
Different analytical and numerical methods for calculating the surface impedance of a high impedance surface (HIS) structure have been studied and compared. In this article, two new approaches are proposed for calculating the surface impedance for general 2D-spatial periodic HIS structures, which include both the symmetric and asymmetric planar ...
Zhu, Y., Bossavit, A., Zouhdi, Said
openaire   +2 more sources

Frequency-Coupling Impedance Model Based Analysis of a High-Frequency Resonance Incident in an Actual MMC-HVDC System

IEEE Transactions on Power Delivery, 2020
Recently, a high-frequency resonance (HFR) incident has been captured in an actual HVDC project of China Southern Power Grid, which is regarded as a new stability issue caused by the interaction between the modular multilevel converter (MMC) and the weak
J. Man, Xiaorong Xie, Shukai Xu, Changyue Zou, C. Yin   +4 more
semanticscholar   +1 more source

Broadband Time-Domain Impedance Models

AIAA Journal, 2001
The modeling of a set of impedance values given either experimentally or heuristically for implementation as a time-domain impedance-equivalent boundary condition (TDIBC) is discussed. It is shown that impedance as defined by the reflection of plane harmonic waves when extended for broadband time-domain applications can correspond to mathematically ...
K.-Y. Fung, Hongbin Ju
openaire   +1 more source

Comparison of Impedance Model and Amplitude–Phase Model for Power- Electronics-Based Power System

IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020
Recently power electronics devices have been widely used in power systems, and the dynamical behavior of the power system has been changing with their increasing penetration.
Ziqian Yang, Cong Mei, Shijie Cheng, M. Zhan   +3 more
semanticscholar   +1 more source

Modelling for Scanning Impedance Imaging

2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005
Scanning electrical impedance imaging (SII) is a previously-introduced high resolution imaging modality with the potential of imaging the electrical activities of biological tissues. In this paper, a detailed complex electrostatic model is derived to describe the physical phenomena of the SII system.
Hongze, Liu, Aaron, Hawkins, Stephen, Schultz, Travis, Oliphant   +3 more
openaire   +2 more sources

Extracting Optimized Bio-Impedance Model Parameters Using Different Topologies of Oscillators

IEEE Sensors Journal, 2020
This paper demonstrates the possibility of extracting the single-dispersion and double-dispersion Cole-bio-impedance model parameters using oscillators (sinusoidal or relaxation).
Menna Mohsen, L. Said, A. Elwakil, A. Madian, A. G. Radwan   +4 more
semanticscholar   +1 more source

The LEP impedance model

Proceedings of International Conference on Particle Accelerators, 2002
The bunch current in LEP is limited by collective effects slightly below its design value. To understand this limitation, a set of experiments has been carried out to obtain a model of the impedance seen by the circulating beam. From measurements of the current dependance of the synchrotron and betatron frequencies information about the longitudinal ...
D. Brandt, K. Cornelis, V. Danilov, A. Hofmann, C. Juillard, E. Perevedentsev, E. Peschardt, E. Rossa, F. Tecker, D. Wang, B. Zotter, L. Rivkin   +11 more
openaire   +1 more source

Efficient impedance model for the estimation of train-induced vibrations in over-track buildings

, 2020
Rapid growth and the urban development of Chinese megacity in recent decades have led to land utilization challenges and the need for over-track buildings above metro depots that are part of the subway systems in these cities.
Chao Zou, J. Moore, M. Sanayei, Yimin Wang, Ziyu Tao   +4 more
semanticscholar   +1 more source

An impedance model to improve the higher frequency limit of electrical measurements on the capacitor cell made from electrodes of finite resistances

Social Science Research Network
capacitors are highly affected above 100 kHz due to the presence of the electrodes resistance and leads inductance. An impedance model has been used to improve the higher frequency limit of the dielectric measurements on the isotropic liquids and ...
R. Dhar
semanticscholar   +1 more source

Impedance Modeling for eRHIC

2018
The impedance budget for the eRHIC project is discussed at its earlier stage of development. As a first step, with the eRHIC lattice and beam parameters , we use the geometric impedances of the vacuum chamber components simulated for the NSLS-II project.
Blednykh, Alexei, Bassi, Gabriele, Blaskiewicz, Michael, Hetzel, Charles, Ptitsyn, Vadim, Smaluk, Victor, Willeke, Ferdinand   +6 more
openaire   +1 more source