scholarly journals Quantitative Analysis of Insulator Degradation in a Single Layer Solenoid by Renormalization of the Transmission Parameter

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1984
Author(s):  
Kwangho Kim ◽  
JunHee Han ◽  
Jangbom Chai ◽  
Wansoo Nah
Keyword(s):  
Transmission Line ◽  
Single Layer ◽  
Transmission Line Model ◽  
Scattering Parameters ◽  
Phase Information ◽  
Transmission Parameter ◽  
Novel Method ◽  
Phase Data ◽  
Renormalization Technique ◽  
Permittivity Change

In this paper, a novel method to quantitatively analyze insulator degradation in a single layer solenoid is proposed. The suggested method employs renormalization of scattering parameters to efficiently detect changes of permittivity in a degraded solenoid. Firstly, a transmission line model, including a locally degraded part in the insulator, was developed, and it was determined that the phase information of the transmission parameter was very informative to check the permittivity change in the transmission line. To check the workability of this idea in a solenoid, a 30-turn single-layer solenoid was designed and fabricated, and 51 degraded states for mimicking insulation deterioration in each turn were introduced by installing additional insulator rings, which increased local relative permittivity. The phase data of the measured transmission parameter turned out to be useful for quantifying changes of the insulator in the solenoid. To maximize the detectability, the measured scattering parameters were renormalized with different reference impedances, which was very useful for detecting degradation in the transmission parameter. In this paper, detailed procedures for quantitatively analyzing degradation of an insulator are proposed and we verify that the suggested renormalization technique is very promising for effectively evaluating the degradation of a solenoid.

Investigation of the characteristics of the Soil by means of TDR probes: preliminary work and future perspectives

2020 ◽  
Author(s):  
Lourdes Farrugia ◽  
Iman Farhat ◽  
Raffaele Persico ◽  
Charles Sammut
Keyword(s):  
Transmission Line ◽  
Short Circuit ◽  
Future Perspectives ◽  
Transmission Line Model ◽  
Scattering Parameters ◽  
Simulation Data ◽  
Model Calculations ◽  
Novel Technique ◽  
Electromagnetic Characteristics ◽  
Network Analyser

<p>In this contribution, we propose a novel technique for the measurement of electromagnetic characteristics of soil by means of a transmission line probe. This approach involves placing a sample of material under test (MUT) inside a transmission line terminated by the short circuit from one end and excited by a VNA at the input end. Unlike the well-known transmission line technique, which requires a two-port connection to a Vector Network Analyser (VNA)  to acquire the scattering parameters (S11 and S21), this method relies only on the measured S11 parameter which is then converted into the complex permittivity (dielectric properties) of the soil. Validation of the proposed transmission line model calculations was compared with numerical simulation data obtained with the CST Studio<sup>®</sup> software and measurement setup of the coax-line. The comparison shows that the dielectric and magnetic properties of a material may be precisely determined with the proposed technique. However, further studies need to be carried to extend this technique, such that a sample can be placed in contact with the probe rather than embedded in it.</p>

Model Order Reduction of Transmission Line Model

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Transmission Line ◽  
Large Scale ◽  
Original System ◽  
Reduced Order Model ◽  
Benchmark Problems ◽  
Transmission Line Model ◽  
Order Model ◽  
Line Model ◽  
Reduced Order ◽  
Numerical Effort

Transmission Line model are an important role in the electrical power supply. Modeling of such system remains a challenge for simulations are necessary for designing and controlling modern power systems.In order to analyze the numerical approach for a benchmark collection Comprehensive of some needful real-world examples, which can be utilized to evaluate and compare mathematical approaches for model reduction. The approach is based on retaining the dominant modes of the system and truncation comparatively the less significant once.as the reduced order model has been derived from retaining the dominate modes of the large-scale stable system, the reduction preserves the stability. The strong demerit of the many MOR methods is that, the steady state values of the reduced order model does not match with the higher order systems. This drawback has been try to eliminated through the Different MOR method using sssMOR tools. This makes it possible for a new assessment of the error system Offered that the Observability Gramian of the original system has as soon as been thought about, an H∞ and H2 error bound can be calculated with minimal numerical effort for any minimized model attributable to The reduced order model (ROM) of a large-scale dynamical system is essential to effortlessness the study of the system utilizing approximation Algorithms. The response evaluation is considered in terms of response constraints and graphical assessments. the application of Approximation methods is offered for arising ROM of the large-scale LTI systems which consist of benchmark problems. The time response of approximated system, assessed by the proposed method, is also shown which is excellent matching of the response of original system when compared to the response of other existing approaches .

Transmission line model for superconducting coplanar lines

1990 ◽  
Vol 26 (2) ◽  
pp. 148 ◽  
Author(s):  
D. Kinowski ◽  
C. Seguinot ◽  
P. Pribetich ◽  
P. Kennis
Keyword(s):  
Transmission Line ◽  
Transmission Line Model ◽  
Line Model

scholarly journals Homogeneous 2D and 3D alignment of cardiomyocyte in dilated cardiomyopathy revealed by intravital heart imaging

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kiyoshi Masuyama ◽  
Tomoaki Higo ◽  
Jong-Kook Lee ◽  
Ryohei Matsuura ◽  
Ian Jones ◽  
...  
Keyword(s):  
Heart Failure ◽  
Dilated Cardiomyopathy ◽  
Cardiac Dysfunction ◽  
Three Dimensional ◽  
Single Layer ◽  
Specific Pattern ◽  
Two Dimensional ◽  
Heart Imaging ◽  
Novel Method ◽  
2D And 3D

AbstractIn contrast to hypertrophic cardiomyopathy, there has been reported no specific pattern of cardiomyocyte array in dilated cardiomyopathy (DCM), partially because lack of alignment assessment in a three-dimensional (3D) manner. Here we have established a novel method to evaluate cardiomyocyte alignment in 3D using intravital heart imaging and demonstrated homogeneous alignment in DCM mice. Whilst cardiomyocytes of control mice changed their alignment by every layer in 3D and position twistedly even in a single layer, termed myocyte twist, cardiomyocytes of DCM mice aligned homogeneously both in two-dimensional (2D) and in 3D and lost myocyte twist. Manipulation of cultured cardiomyocyte toward homogeneously aligned increased their contractility, suggesting that homogeneous alignment in DCM mice is due to a sort of alignment remodelling as a way to compensate cardiac dysfunction. Our findings provide the first intravital evidence of cardiomyocyte alignment and will bring new insights into understanding the mechanism of heart failure.

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