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Estimation of potassium levels in hemodialysis patients by T wave nonlinear dynamics and morphology markers
Computers in Biology and Medicine. 2022. Vol. 143. No. 1. Article 10530412.
Objective: Noninvasive screening of hypo- and hyperkalemia can prevent fatal arrhythmia in end-stage renal disease (ESRD) patients, but current methods for monitoring of serum potassium ([K+]) have important limita-tions. We investigated changes in nonlinear dynamics and morphology of the T wave in the electrocardiogram (ECG) of ESRD patients during hemodialysis (HD), assessing their relationship with [K+]and designing a [K+]estimator.
S. Sabarathinam, AIP Conference Proceedings 2019 Vol. 2115 No. 1 Article 030212
Microelectromechanical system (MEMS) oscillators are timing devices that generate highly stable frequencies. The stability of the MEMS resonator is widely studied in recent years for avoiding such pull in-instability event. In this letter, we found the MEMS resonator approach the pull in-instability via the emerging extreme event (EE) phenomenon. We analyze the EE with many ...
Added: October 31, 2021
Electronics Letters 2018 Vol. 54 No. 20 P. 1160-1162
A mathematical model of a tumour growth cancer cell is investigated. A simple analogue circuit for mimicking the tumour growth cancer cell model is constructed for the first time. The stability of the proposed system is studied. The familiar chaos control technique, i.e. the non-feedback loop is performed to control the chaotic behaviour. The possible ...
Added: October 31, 2021
T B., Srinivasan S., K T., Chaos, Solitons and Fractals 2021 Vol. 153 No. 1 Article 111569
In this work, we report the existence of extreme events in the well known Bonhoeffer-van der Pol (BVP) oscillator under the excitation of a periodically forced voltage. Extreme events refer to the sudden and random increase in the amplitude of one or more of the state variables of the dynamical system and arise because of the incidence ...
Added: November 20, 2021
Nallappan G., Srinivasan S., Guisheng Z. et al., IEEE Access 2021 Vol. 9 No. 1 Article 25648
In this paper, we investigate sampled-data stabilization of memristor nonlinearity in Chua's circuits. The system stability pertaining to its switching nonlinearity covers two situations of flux thresholds. Through the stability analysis, the multistability characteristic is proved by its periodic invariant stable line. Moreover, the dynamical features of the considered system are examined in details by ...
Added: October 31, 2021
Vadivel R., Srinivasan S., Wu Y. et al., Mathematical Methods in the Applied Sciences 2021 Vol. 1 No. 1 P. 1-18
The bifurcation, stability and stabilization analysis of permanent magnet synchronous motor (PMSM) systems are investigated in this paper. To begin, a new class of delay-dependent sufficient conditions is suggested with respect to the information of the membership function, a relevant Lyapunov-Krasovskii functional (LKF), and the overall information connected with the real sampling pattern, so that ...
Added: October 31, 2021
Rajagopal M., Kwon O., Jagadeesan P. et al., ScienceDirect 2022 Vol. 339 Article 113510
Fullerenes have been extensively investigated in biomedical and material science, owing to their distinct physicchemical properties. At this juncture, we validated the improved electro-mechanical actuation of Fullerenereinforced sulfonated polyetherimide (SPEI) as a novel electromechanical actuator. In the specific, tiny
amount of Fullerene (0.5 wt%) reinforced in the SPEI matrix, the bending distortion of the Fullerene-SPEI actuators ...
Added: March 23, 2022
Varshney V., Singh A., Kumarasamy S. et al., AIP Conference Proceedings 2023 Vol. 2768 No. 1 Article 020037
In this present manuscript, we investigate the Indian COVID-19 vaccination data sets from the beginning of the vaccination. We observed the artificial extreme events (AEE) in a vaccination process during the Teeka Utsav massive vaccination plan. We found some importance and effects of this event and subsequently we analyse the data set with the moving ...
Added: June 27, 2023
Thangavel B., Srinivasan S., Kathamuthu T. et al., Elsevier 2022 Vol. 24 No. 4 P. 1944-1957
This paper investigates the sampled-data stabilization of the Takagi–Sugano (T–S) fuzzy system, focusing on the existence of extreme event (EE) and its application to the financial model. The mathematical model of finance system is constructed through real time hardware experiment for the first time. The EE is identified in certain ranges of system parameters, is ...
Added: February 3, 2022
Kumarasamy S., Srinivasan S., Gogoi P. B. et al., Communications in Nonlinear Science and Numerical Simulation 2022 Vol. 107 Article 106170
We present a class of extreme events manifested in dynamical systems involving time-dependentattractive and repulsive couplings. We consider two cases of time-varying coupling strengths -(i) explicit time-dependence (periodically varying) and (ii) implicit time dependence (distance-dependent coupling). In both of these cases, the coupled systems generate quasi-stable equilibriumpoints, which in turn are responsible for the ...
Added: December 17, 2021
Nonlinear Dynamics 2014 Vol. 78 No. 1 P. 1033-1047
In this paper, an experimental implementation of State Controlled Cellular Neural Network (SC-CNN)-based canonical Chua’s circuit is presented. Two such electronic circuits are realized. One of the circuits is configured as driver or transmitter, and other circuit is configured as response or receiver system. Synchronization of chaos between the driver and the driven system is ...
Added: October 31, 2021
International Journal of Bifurcation and Chaos in Applied Sciences and Engineering 2018 Vol. 28 No. 1 P. 1850013-1850013
In this paper, the recent and emerging phenomenon of hidden oscillations is observed in a newly implemented memristor-based autonomous Duffing oscillator for the first time. The hidden oscillations are presented and quantified by various statistical measures. The system shows a large number of hidden attractors for a wide range of the system parameters. This study ...
Added: October 31, 2021
Nonlinear Dynamics 2017 Vol. 87 No. 1 P. 37-49
t An electronic model of Duffing oscillator with a characteristic memristive nonlinear element is proposed instead of the classical cubic nonlinearity. The memristive Duffing oscillator circuit system is mathematically modeled, and the stability analysis presents the evolution of the proposed system. The dynamical behavior of this circuit is investigated through numerical simulations, statistical analysis, and ...
Added: October 31, 2021
Srinivasan S., Prasad A., AIP Conference Proceedings 2018 Vol. 1942 No. 1 Article 060025
The memristor is known as abasic fourth passive solid state circuit element. Itgaining increasing attention to create the next generation electronic devices commonly used as fundamental chaotic circuit although often arbitrary (typically piecewise linear or cubic) fluxcharge characteristics. In thispresent work, the causes of the memristor emulator studied in a coupled memristive chaoticoscillator for the ...
Added: October 31, 2021
Chaos 2016 Vol. 26 No. 8 P. 083104-083104
A large parameter mismatch can induce amplitude death in two instantaneously coupled oscillators. Alternatively, a time delay in the coupling can induce amplitude death in two identical oscillators. We unify the mechanism of quenching of oscillation in coupled oscillators, either by a large parameter mismatch or a delay coupling, by a common lag scenario that is, surprisingly, different from the conventional lag synchronization. We present ...
Added: October 31, 2021
AIP Conference Proceedings 2017 Vol. 1832 No. 1 P. 060007-060007
In this letter, the peculiar nonlinear oscillator namely Duffing oscillator with active variable memristor is presented for the first time. The central concept of this work is the variable memristor is that its memductance could be controlled by changing the cubic function which describes a relationship between the flux and charge of the memristor. It ...
Added: October 31, 2021
Springer Publishing Company, 2018
Studying the memristor based chaotic circuit and their dynamical analysis has been an increasing interest in recent years because of its nonvolatile memory. It is very important in dynamic memory elements and neural synapses. In this chapter, the recent and emerging phenomenon such as hidden oscillation is studied by the new implemented memristor based autonomous ...
Added: October 31, 2021
Springer Publishing Company, 2017
The theory of memristor was postulated in the year of 1971 by Leon O. Chua. The intensive interest on memristive systems is given by the researchers since after the physical realization of the hysteresis behavior in a nanoscale TiO22 memristor in 2008 by a group of researchers at HP Labs lead by Stanley Williams. Research on ...
Added: October 31, 2021
Nonlinear Dynamics 2017 Vol. 87 No. 4 P. 2345-2356
We investigate the nonlinear dynamics of a system of generalized Duffing-type MEMS resonator in the frame of simple analog electronic circuit. A mathematical model formed for the proposed generalized Duffing-type MEMS oscillator in which nonlinearities arising out of two different sources such as mid-plane stretching and electrostatic force can lead to variety of nonlinear phenomena ...
Added: October 31, 2021
Chaos, Solitons and Fractals 2015 Vol. 73 No. 1 P. 129-140
In this work, transient chaos in a ring and globally coupled system of nearly conservative Hamiltonian Duffing oscillators is reported. The networks are formed by coupling of three, four and six Duffing oscillators. The nearly conservative Hamiltonian nature of the coupled system is proved by stability analysis. The transient phenomenon is confirmed through various numerical ...
Added: October 31, 2021
Chaos, Solitons and Fractals 2017 Vol. 95 No. 1 P. 33-41
We report the dynamics of a low dimensional fractional order forced LCR circuit using Chua’s diode. The stability analysis is performed for each segment of the piecewise linear curve of Chua’s diode and the conditions for the oscillation and double scroll chaos are obtained. The effect of fractional order on the bifurcation points are studied with the help of ...
Added: October 31, 2021
Bhagyaraj T., S Sabarathinam, Ishaq Ahamed A. et al., Pramana - Journal of Physics 2023 Vol. 97 No. 1 Article 170
Super-extreme events (SEEs) are considered rare events and have been reported by only a few researchers. However, interest in these occurrences have increased nowadays because of their possible applications in analysing different systems, such as biological, chemical, electrical and engineering systems. In this paper, we report the phenomenon of SEEs in the forced Bonhoeffer–van der ...
Added: October 17, 2023
М. : МАКС Пресс, 2023
В 2023 году Московский университет проводит очередной Международный молодежный научный форум «Ломоносов». На сегодняшний день Форум «Ломоносов» является одним из крупнейших в мире мероприятий для научной молодежи, а по численности участников и количеству охватываемых научных направлений не имеет аналогов. ...
Added: August 4, 2023
Communications in Nonlinear Science and Numerical Simulation 2013 Vol. 18 No. 11 P. 3098-3107
The dynamics of two coupled, dissipatively perturbed, near-integrable Hamiltonian, double-well Duffing oscillators has been studied. We give numerical and experimental (circuit implementation) evidence that in the case of small positive or negative damping there exist two different types of transient chaos. After the decay of the transient chaos in the neighborhood of chaotic saddle we ...
Added: October 31, 2021
Butovskaya M., Annals of Human Genetics 2018 Vol. 82 No. 6 P. 407-414
The key regulator in the control of aggressive behavior is dopamine receptors. Association of variants in these genes with aggression has been shown in modern populations. However, these studies have not been conducted in traditional cultures. The aim of our study was to investigate population features in distributions of allele and genotype frequencies of DRD2 rs1800497, DRD4 120 bp Ins, ...
Added: September 20, 2018