Constructing an Integrated Inductive-Capacitive Component to filter Harmonic Modulations

2020 ◽  
pp. 1-1
Author(s):  
Andreas Michaelides ◽  
Thanos Nicolaou
Keyword(s):  
Capacitive Component

Abstract P103: Effects of Chest Compression Pressure Field on Stroke Volume during Cardiopulmonary Resuscitation

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Joshua W Lampe ◽  
Gerrit J Noordergraaf ◽  
Abraham Noordergraaf ◽  
Lance B Becker
Keyword(s):  
Blood Flow ◽  
Stroke Volume ◽  
Chest Compression ◽  
Heart Valves ◽  
Compression Pressure ◽  
Pressure Fields ◽  
Inductive Component ◽  
Capacitive Component ◽  
Wave Forms ◽  
Rlc Circuits

Hypothesis: The way that chest compressions generate blood flow remains unclear. Additionally, different mechanical chest compression devices may create different thoracic pressure fields. We hypothesize that three thoracic pressure fields, direct ventricular massage, cardiac pump, and thoracic pump, generate blood flow through different mechanisms resulting in different stroke volumes. Methods: The Donder’s model of the human cardiovascular system models vessels as resistor-inductor-capacitor (RLC) circuits, where the resistive component describes the viscous resistance to blood flow, the inductive component describes the inertial resistance to blood flow changes, and the capacitive component describes the elastic properties of the vessel. The model can account for effects of respiration on blood flow. Cardiac output for the three pressure fields was modeled using sinusoidal compression waveforms with maximum pressures between 25 and 150 mmHg. Results: The figure shows the dependence of stroke volume on the pressure maximum for the three pressure fields. Peak stroke volumes occur near 75 mmHg for ventricular massage, 125 mmHg for thoracic pump, and 25 mmHg for cardiac pump compressions. Ventricular massage and the cardiac pump model utilize the heart valves to generate blood flow. The thoracic pump model generates blood flow by utilizing the elastic differences between veins and arteries. Conclusions: The three pressure fields have unique values for optimum compression pressure. The Donder’s model may allow for rapid investigation of many pressure fields, pressure wave forms, and compression to ventilation ratios to accelerate the optimization of CPR.

Radio frequency properties of a plane grid capacitor immersed in a hot collision-free plasma

1968 ◽  
Vol 2 (3) ◽  
pp. 339-351 ◽  
Author(s):  
R. Buckley
Keyword(s):  
Plasma Frequency ◽  
Real Component ◽  
Hot Plasma ◽  
Capacitive Component ◽  
Longitudinal Plasma ◽  
Imaginary Field ◽  
Complex Admittance ◽  
Frequency Properties ◽  
Plane Grid ◽  
Made In

A pair of plane parallel grids is inserted in a hot plasma, and an oscillatory voltage is applied across them. The electric field excited in the plasma, and the complex admittance of the grid/plasma system, are computed for applied frequencies high enough to justify neglect of ion response. The grids are electrically, but not mechanically, coupled to the plasma, which is assumed to be in a spatially uniform collision free Maxwellian equilibrium state. The field is computed as a function of distance from the grid plates over a range of frequencies covering the plasma frequency, and the complex admittance of the system is computed as a function of frequency at various grid separation distances. The real component of the field and the capacitive component of the admittance are subject to three major effects: cold plasma dielectric behaviour, oscillatory Debye sheaths on the grids, and (above the plasma frequency), longitudinal plasma waves. The imaginary field component and the conductive admittance component are produced by spatial Landau damping. In an accompanying paper (Freeston 1968), the computed admittance is compared with laboratory measurements made in a situation approximating well to the idealized problem considered here.

scholarly journals Disturbance Elimination for Partial Discharge Detection in Spacer of Gas-Insulated Switchgears

2017 ◽  
Author(s):  
Guoming Wang ◽  
Gyung-Suk Kil ◽  
Hong-Keun Ji ◽  
Jong-Hyuk Lee
Keyword(s):  
Wavelet Transform ◽  
Partial Discharge ◽  
Detection Sensitivity ◽  
Discrete Wavelet ◽  
Mother Wavelet ◽  
Signal Energy ◽  
Monitoring And Diagnosis ◽  
Capacitive Component ◽  
Increasing Demand ◽  
Thresholding Function

With the increasing demand for precise condition monitoring and diagnosis of gas-insulated switchgears (GIS), it has become a challenge to improve the detection sensitivity of partial discharge (PD) induced in the GIS spacer. This paper deals with the elimination of the capacitive component from the phase resolved partial discharge (PRPD) signal generated in GIS spacer based on the discrete wavelet transform. Three types of typical insulation defects were simulated using PD cells. The single PD pulses were detected and were further used to determine the optimal mother wavelet. As a result, the bior6.8 was selected to decompose the PD signal into 8 levels and the signal energy at each level was calculated. The decomposed components related with capacitive disturbance were discarded whereas those associated with PD were de-noised by a threshold and a thresholding function. Finally, the PRPD signals were reconstructed using the de-noised components.

A Microfabricated Multilayer Impedance System for Ionic Transport Characterization in Nanocapillary Arrays

2006 ◽  
Author(s):  
Shaurya Prakash ◽  
Junghoon Yeom ◽  
Mark A. Shannon
Keyword(s):  
Electrochemical Impedance ◽  
Reference Electrode ◽  
Aqueous Salt Solution ◽  
Ionic Charge ◽  
Capacitive Component ◽  
Flow Through ◽  
Nyquist Plots ◽  
Eis Measurements ◽  
Rc Circuit ◽  
Rc Time Constant

A multilayer micro-electrochemical impedance spectroscopic (μ-EIS) system with an integrated Ag/AgCI reference electrode has been developed using MEMS technologies. This μ-EIS system is used to characterize ionic and fluidic transport across nanocapillary array membranes (NCAM), which are comprised of arrays of individual nanopores. Impedance measurements giving magnitude, phase, and I-V characteristics provide insight into the interaction between translocating ions and the electric double layer (EDL) within nanocapillaries due to changes in the surface zeta potential and the ionic charge of the electrolyte. μ-EIS measurements for ionic flow through the NCAM with pore diameters from 10 to 800 nm with an aqueous salt solution indicate that these NCAM behave as nearly ideal RC circuits at electrolyte concentrations on the order of 100 mM, when the EDL within these pores do not overlap. Nyquist plots show an increase in the RC time constant with decreasing salt concentration. Under conditions of EDL overlap, hindered transport in the pores causes deviation from ideal RC circuit-like behaviour with the capacitive component of impedance beginning to dominate.

Test Method for Resistive Current of Arrester for Cable Line Based on Phase Search

2013 ◽  
Vol 860-863 ◽  
pp. 1977-1981
Author(s):  
Dan Pang ◽  
Zhen Hao Wang ◽  
Xiao Juan Han ◽  
Xi Lin Zhang ◽  
Chao Bin Wang
Keyword(s):  
Reference Signal ◽  
Phase Correction ◽  
Test Method ◽  
Total Current ◽  
Cable Line ◽  
Monitoring Method ◽  
Voltage Signal ◽  
Capacitive Component ◽  
Total Leakage ◽  
Resistive Component

Resistive monitoring method for conventional arrester is not applicable to cable line and it is also not easy to get access to voltage signal. In this thesis, a new method for testing resistive current is adopted, in which the only job is to collect the total leakage current of arrester, simulate a reference signal based on total current information, conduct phase shift to realize phase correction and find out the phase of capacitive component and resistive component, and thus the test on resistive current of arrester for cable line is completed.

scholarly journals PARAMETRIC IDENTIFICATION OF ARC-SUPPRESSION REACTOR IN THE BASIS OF INSTANTANEOUS VALUES

2021 ◽  
pp. 53-63
Author(s):  
Yuri A. Dementiy ◽  
Kirill P. Nikolaev ◽  
Rustem R. Galimzyanov
Keyword(s):  
Single Phase ◽  
Parametric Identification ◽  
Distribution Networks ◽  
Practical Application ◽  
Computing Power ◽  
Capacitive Component ◽  
Instantaneous Values ◽  
The Stability ◽  
The Mathematical Model ◽  
Influence Of Noise

Single-phase earth faults occur in 6–35 kV distribution networks. One of the devices designed to eliminate earth faults is the arc suppression reactor. The inductance of the reactor is set in resonance with the capacitance of the network, which results in the suppression of the capacitive component of the current. A method of determining the inductance of a reactor using instantaneous values of current and voltage is proposed. A differential equation linking the measured quantities is derived. The equation is written for two moments of time, and a system from which the expression for the reactor inductance is derived. Numerical approximation of the derivatives by means of the asymmetric difference derivative was carried out. The mathematical model of the reactor was composed. The influence of the asymmetry coefficient and the main parameters of the considered transients on the accuracy of determining the reactor inductance was analyzed. The influence of noise on the accuracy of determining the inductance of the reactor was considered. The influence of the main parameters of the considered transients on the stability of the method to noise is analyzed. The confidence intervals of the calculated inductance for different values of relative noise are constructed. An upgraded method for determining the detuning based on the solution of an overdetermined system of equations is proposed. The robustness of the upgraded method to the influence of noise was analyzed. The modernized method has shown to be more robust to the influence of noise in comparison with the method based on solving a system consisting of equations written for two moments of time. A test of the methods on a real oscillogram of current and voltage is described. Recommendations on the practical application of the developed methods are offered. The upgraded method is appropriate when there is a high influence of noise and no limitations on the computing power of devices, the method of calculating the inductance by two readings should be used in all other cases.

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