scholarly journals Crisis of transient chaos in an electronic relaxation oscillator

2003 ◽  
Vol 52 (5) ◽  
pp. 1079
Author(s):  
Lu Yun-Qing ◽  
Wang Wen-Xiu ◽  
He Da-Ren
Keyword(s):  
Relaxation Oscillator ◽  
Transient Chaos ◽  
Electronic Relaxation

Delayed dynamics in an electronic relaxation oscillator

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
Angelo Di Garbo ◽  
Stefano Euzzor ◽  
Jean-Marc Ginoux ◽  
F. Tito Arecchi ◽  
Riccardo Meucci
Keyword(s):  
Relaxation Oscillator ◽  
Electronic Relaxation

STRANGE REPELLER'S CRISIS IN SOME NON-SMOOTH SYSTEMS

2004 ◽  
Vol 18 (17n19) ◽  
pp. 2608-2612
Author(s):  
WEN-XIU WANG ◽  
YUE HE ◽  
YING SHEN ◽  
YUN-QING LU ◽  
DA-REN HE
Keyword(s):  
Sudden Change ◽  
Relaxation Oscillator ◽  
Electronic Relaxation ◽  
Tent Map ◽  
Kicked Rotor

A new kind of crisis is defined as a sudden change of a strange repeller. It can be observed in some non-smooth systems, such as a tent map, a "hole map", an electronic relaxation oscillator, and a discontinuous kicked rotor.

A Transient Crisis

2003 ◽  
Vol 17 (22n24) ◽  
pp. 4201-4208
Author(s):  
Da-Ren He ◽  
Wen-Xiu Wang ◽  
Yun-Qing Lu
Keyword(s):  
Fractal Dimension ◽  
Numerical Investigation ◽  
Linear Model ◽  
Critical Parameter ◽  
Piecewise Linear ◽  
Sudden Change ◽  
Relaxation Oscillator ◽  
Electronic Relaxation ◽  
Piecewise Linear Model

A new kind of crisis, which is marked by a sudden change of a strange repeller, is observed in an electronic relaxation oscillator. Fist, by its simplified piecewise linear model, we show analytically that a strange repeller appears after a hole-induced crisis, and that the fractal dimension of the strange repeller and the averaged lifetime of the iterations in the region occupied by the original attractor suddenly change at a critical parameter value when the repeller disappears. Our numerical investigation convinces us that the corresponding phenomenon can be found in the original electronic relaxation oscillator.

SIMULATION OF SINUS NODE ACTIVITY BY AN ELECTRONIC RELAXATION OSCILLATOR

1966 ◽  
Vol 44 (2) ◽  
pp. 301-315 ◽  
Author(s):  
F. A. Roberge ◽  
R. A. Nadeau
Keyword(s):  
Sinus Node ◽  
Relaxation Oscillator ◽  
Rhythmic Activity ◽  
Electronic Relaxation ◽  
Node Activity ◽  
Relaxation Oscillators ◽  
Ventricular Response ◽  
Sinus Node Activity ◽  
The Right ◽  
Intact Heart

After the sinus node was destroyed, its rhythmic activity was simulated by an electronic relaxation oscillator coupled to the beating heart. The output of the oscillator was used to stimulate the right atrium, and the ventricular response was returned to the input of the relaxation oscillator. By manually varying the frequency of this artificial pacemaker it was possible to produce changes in the rate of the atrio–ventricular (A–V) node similar to those obtained by perfusion of the intact sinus node with chronotropic agents. Particular attention was paid to the transitions from "oscillator" rhythm to A–V nodal rhythm, and vice versa. The results provide support for the following hypotheses relative to the intact heart: (i) some form of sinus node activity persists during A–V nodal rhythm, and (ii) the principal pacemakers of the heart, the sinus and A–V nodes, behave as a system of coupled relaxation oscillators.

CHANGES IN ATRIAL RATE DURING AND FOLLOWING VENTRICULAR ARREST FROM ACETYLCHOLINE INJECTIONS INTO THE ATRIOVENTRICULAR NODE ARTERY OF THE DOG

1967 ◽  
Vol 45 (3) ◽  
pp. 375-388 ◽  
Author(s):  
R. A. Nadeau ◽  
A. K. Amir-Jahed ◽  
F. A. Roberge
Keyword(s):  
Sinus Rhythm ◽  
Closed Loop ◽  
Sinus Node ◽  
Atrioventricular Node ◽  
Relaxation Oscillator ◽  
Electronic Relaxation ◽  
Atrial Rate ◽  
Model Experiments ◽  
Relaxation Oscillators ◽  
Ventricular Activity

During ventricular arrest obtained by injections of acetylcholine into the canine atrioventricular node artery, atrial acceleration of variable magnitude was observed. Upon return of ventricular activity a marked slowing of atrial rate was usually noted, followed by a gradual return to the initial sinus rhythm. Similar phenomena were observed with a preparation in which the sinus node was destroyed and its activity simulated by an electronic relaxation oscillator coupled to the heart in a closed-loop fashion. Model experiments with two interacting relaxation oscillators suggested that atrial acceleration during ventricular arrest, and atrial slowing during the return of ventricular activity, were governed by some sort of feedback from ventricles to sinus node.

ELECTRONIC RELAXATION IN RARE EARTH METALS AND ALLOYS - A NON-KRAMERS EXAMPLE : Tm3+

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-25-C1-31 ◽  
Author(s):  
N. S. Dixon ◽  
L. S. Fritz ◽  
Y. Mahmud ◽  
B. B. Triplett ◽  
S. S. Hanna ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Metals And Alloys ◽  
Electronic Relaxation

Excited-State Dynamics in the RNA Nucleotide Uridine 5’-Monophosphate Investigated by Femtosecond Broadband Transient Absorption Spectroscopy

2019 ◽  
Author(s):  
Matthew M. Brister ◽  
Carlos Crespo-Hernández
Keyword(s):  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Transient Absorption ◽  
Electronic Energy ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Vibrationally Excited ◽  
Excited State Dynamics ◽  
Π State

<p></p><p> Damage to RNA from ultraviolet radiation induce chemical modifications to the nucleobases. Unraveling the excited states involved in these reactions is essential, but investigations aimed at understanding the electronic-energy relaxation pathways of the RNA nucleotide uridine 5’-monophosphate (UMP) have not received enough attention. In this Letter, the excited-state dynamics of UMP is investigated in aqueous solution. Excitation at 267 nm results in a trifurcation event that leads to the simultaneous population of the vibrationally-excited ground state, a longlived <sup>1</sup>n<sub>O</sub>π* state, and a receiver triplet state within 200 fs. The receiver state internally convert to the long-lived <sup>3</sup>ππ* state in an ultrafast time scale. The results elucidate the electronic relaxation pathways and clarify earlier transient absorption experiments performed for uracil derivatives in solution. This mechanistic information is important because long-lived nπ* and ππ* excited states of both singlet and triplet multiplicities are thought to lead to the formation of harmful photoproducts.</p><p></p>

A 296 nJ Energy-per-Measurement Relaxation Oscillator-Based Analog Front-End for Chemiresistive Sensors

2021 ◽  
pp. 1-11
Author(s):  
Antonio Vincenzo Radogna ◽  
Simonetta Capone ◽  
Luca Francioso ◽  
Pietro Aleardo Siciliano ◽  
Stefano D'Amico
Keyword(s):  
Relaxation Oscillator ◽  
Front End ◽  
Analog Front End
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