scholarly journals Impact of Synchronization Phase Dynamics on DQ Impedance Measurement

2018 ◽  
Author(s):  
Hong Gong ◽  
Dongsheng Yang ◽  
Xiongfei Wang
Keyword(s):  
Impedance Measurement ◽  
Phase Dynamics ◽  
Synchronization Phase

scholarly journals Synchronization in a coupled two-layer quasigeostrophic model of baroclinic instability – Part 1: Master-slave configuration

2009 ◽  
Vol 16 (4) ◽  
pp. 543-556
Author(s):  
A. A. Castrejón-Pita ◽  
P. L. Read
Keyword(s):  
Phase Synchronization ◽  
Baroclinic Instability ◽  
Coupled System ◽  
Zonal Flow ◽  
Chaotic Regime ◽  
Phase Dynamics ◽  
Show Evidence ◽  
Synchronization Phase ◽  
Quasigeostrophic Model ◽  
Phase Slips

Abstract. Synchronization is studied using a pair of diffusively-coupled, two-layer quasi-geostrophic systems each comprising a single baroclinic wave and a zonal flow. In particular, the coupling between the systems is in the well-known master-slave or one-way configuration. Nonlinear time series analysis, phase dynamics, and bifurcation diagrams are used to study the dynamics of the coupled system. Phase synchronization, imperfect synchronization (phase slips), or complete synchronization are found, depending upon the strength of coupling, when the systems are either in a periodic or a chaotic regime. The results of investigations when the dynamics of each system are in different regimes are also presented. These results also show evidence of phase synchronization and signs of chaos control.

Temperature Synchronization, Phase Dynamics and Oscillation Death in a Ring of Thermally-Coupled Rooms

2011 ◽  
Author(s):  
Jeffrey O’Brien ◽  
Mihir Sen
Keyword(s):  
Room Temperature ◽  
Independent Solution ◽  
Thermal Coupling ◽  
System Of Differential Equations ◽  
Thermostatic Control ◽  
Phase Dynamics ◽  
Temperature Oscillations ◽  
Solution Type ◽  
Synchronization Phase ◽  
Differential Equations Models

Synchronization of coupled, self-excited oscillators in complex systems is a common occurance. This report examines the effects of thermal coupling through the walls of a building on temperature oscillations due to hysteretic thermostatic control. The specific case of three rooms is studied. A system of differential equations models the dynamics of each room temperature, accounting for on-off heating, heat loss to the environment, and heat exchange between rooms. Three types of solutions are observed: one in which all room temperatures oscillate in phase, another with the oscillations equidistant in phase, and a third that is time-independent. The existence and linear stability of each solution type is investigated as a function of a parameter k that represents the thermal interaction between neighboring rooms. The in-phase behavior exists and is linearly stable for all k, the out-of-phase oscillations exist in a band of k and are stable in a smaller band, and the time-independent solution exists above a certain k where they are stable.

scholarly journals Phase-response analysis of synchronization for periodic flows

2018 ◽  
Vol 846 ◽  
Author(s):  
Kunihiko Taira ◽  
Hiroya Nakao
Keyword(s):  
Fluid Flows ◽  
Phase Response ◽  
Response Analysis ◽  
Phase Variable ◽  
External Forcing ◽  
Cylinder Wake ◽  
Periodic Flows ◽  
Phase Dynamics ◽  
Phase Reduction ◽  
Synchronization Phase

We apply phase-reduction analysis to examine synchronization properties of periodic fluid flows. The dynamics of unsteady flows is described in terms of the phase dynamics, reducing the high-dimensional fluid flow to its single scalar phase variable. We characterize the phase response to impulse perturbations, which can in turn quantify the influence of periodic perturbations on the unsteady flow. These insights from phase-based analysis uncover the condition for synchronization. In the present work, we study as an example the influence of periodic external forcing on an unsteady cylinder wake. The condition for synchronization is identified and agrees closely with results from direct numerical simulations. Moreover, the analysis reveals the optimal forcing direction for synchronization. Phase-response analysis holds potential to uncover lock-on characteristics for a range of periodic flows.

An Impedance Measurement Method of Solar Panels by Power Converter using PRBS

2020 ◽  
Vol 140 (3) ◽  
pp. 140-147
Author(s):  
Koji Takechi ◽  
Takeshi Yokoi ◽  
Hiroaki Kakigano
Keyword(s):  
Measurement Method ◽  
Impedance Measurement ◽  
Power Converter ◽  
Solar Panels

Power Dependent Impedance Measurement Exploiting an Oscilloscope and Möbius Transformation

2017 ◽  
Vol E100.C (10) ◽  
pp. 918-923
Author(s):  
Sonshu SAKIHARA ◽  
Masaru TAKANA ◽  
Naoki SAKAI ◽  
Takashi OHIRA
Keyword(s):  
Impedance Measurement ◽  
Möbius Transformation ◽  
Mobius Transformation

Electrical Capacitance Volume Tomography (ECVT) for industrial and medical applications-An Overview

2015 ◽  
Vol 11 (1) ◽  
pp. 2897-2908
Author(s):  
Mohammed S.Aljohani
Keyword(s):  
Imaging Technique ◽  
Three Dimensional ◽  
Biological Processes ◽  
Electrical Capacitance ◽  
Image Reconstruction Techniques ◽  
Phase Dynamics ◽  
Non Invasive ◽  
Electrical Capacitance Volume Tomography ◽  
And Performance ◽  
Optimization And Performance

Tomography is a non-invasive, non-intrusive imaging technique allowing the visualization of phase dynamics in industrial and biological processes. This article reviews progress in Electrical Capacitance Volume Tomography (ECVT). ECVT is a direct 3D visualizing technique, unlike three-dimensional imaging, which is based on stacking 2D images to obtain an interpolated 3D image. ECVT has recently matured for real time, non-invasive 3-D monitoring of processes involving materials with strong contrast in dielectric permittivity. In this article, ECVT sensor design, optimization and performance of various sensors seen in literature are summarized. Qualitative Analysis of ECVT image reconstruction techniques has also been presented.

Stereospecific 1,3-H Transfer of Indenols Proceeds via Persistent Ion-Pairs Anchored By NH···Pi Interactions

2018 ◽  
Author(s):  
David Ascough ◽  
Fernanda Duarte ◽  
Robert Paton
Keyword(s):  
Computational Analysis ◽  
Ion Pairs ◽  
Ion Pair ◽  
Hydrogen Atom Transfer ◽  
Polar Solvents ◽  
Chirality Transfer ◽  
Activation Barriers ◽  
Sense And Avoid ◽  
Phase Dynamics ◽  
Pi Interactions

The base-catalyzed rearrangement of arylindenols is a rare example of a suprafacial [1,3]-hydrogen atom transfer. The mechanism has been proposed to proceed via sequential [1,5]-sigmatropic shifts, which occur in a selective sense and avoid an achiral intermediate. A computational analysis using quantum chemistry casts serious doubt on these suggestions: these pathways have enormous activation barriers and in constrast to what is observed experimentally, they overwhelmingly favor a racemic product. Instead we propose that a suprafacial [1,3]-prototopic shift occurs in a two-step deprotonation/reprotonation sequence. This mechanism is favored by 15 kcal mol<sup>-1</sup> over that previously proposed. Most importantly, this is also consistent with stereospecificity since reprotonation occurs rapidly on the same p-face. We have used explicitly-solvated molecular dynamics studies to study the persistence and condensed-phase dynamics of the intermediate ion-pair formed in this reaction. Chirality transfer is the result of a particularly resilient contact ion-pair, held together by electrostatic attraction and a critical NH···p interaction which ensures that this species has an appreciable lifetime even in polar solvents such as DMSO and MeOH.

Sign in / Sign up

Export Citation Format

Share Document