Oscillation oscillatory medium

In conclusion, the study of models for Ca signalling indicates that the phenomena of Ca oscillations and waves are closely intertwined. The spatiotemporal patterns correspond to the propagation of a Ca front in a biochemically excitable or oscillatory medium, at a rate much higher than that associated with simple diffusion. Such a property could also underlie a possible role of Ca waves in intercellular communication (Charles et al., 1991). The results presented in figs. 9.30 and 9.31 show that a unique mechanism, based on CICR, can account for the... 

We first consider an apparently simple situation a trigger wave in an oscillatory medium. The period-1 limit cycle that exists for small K2 values to the left of the period doubling cascade shown in Figure 2 takes on a relaxation character as 2 is increased towards period-2. If the temporal profile of such an oscillation is transcribed into the spatial domain a trigger wave is formed as is shown in the top panel of Figure 7. To obtain the results in this panel... 

Combustion of a propellant in a rocket motor accompanied by high-frequency pressure oscillation is one of the most harmful phenomena in rocket motor operation. There have been numerous theoretical and experimental studies on the acoustic mode of oscillation, concerning both the medium-frequency range of 100 Hz-1 kHz and the high-frequency range of 1 kHz-30 kHz. The nature of oscillatory combustion instability is dependent on various physicochemical parameters, such... 

The average lifetime of a coagulated pair (doublet) of small particles can be calculated by examining the relative Brownian motion of the particle pair in the interaction potential well- If the energy imparted by the collisions of the molecules of the medium is smaller than the depth of the interaction potential well, the particle pair will exhibit an oscillatory motion within the potential well. It will be shown later that, for sufficiently small particles, the time scale of these oscillations is much smaller than... 

It should be noted that, depending on the particular laser gain medium and resonator configuration, oscillatory start-up behaviour might be encountered. For example, CW Nd YAG lasers frequently exhibit this behaviour. However, for long-time continuous operation this is irrelevant, since an experiment can easily commence after the switch-on oscillations have died down (in the worst case they will last for a few milliseconds at most). 

The MA in BZ reaction has an important drawback which is producing carbon dioxide gas bubbles in the oscillating reaction process. Some attempts have been made to develop gas-free versions of the BZ reactions. The diketonic compound such as cyclohexanedione (CHD) is a well-set example in which the gas-free oscUlations and formation of spatial patterns have been examined. The acetyl acetone (AA) and ethyl acetoacetate (EAA) can also bear an analogue diketonic property. The potential oscillations in these two compounds have been reported in well-stirred medium. Though, the characteristics of an oscillating reaction in stirred reaction may differ from the unstirred reaction medium. Thus, two diketonic compounds, namely AA and EAA, are selected to extend the study of patterns formation and oscillatory behaviors in unstirred BZ conditions. 

Oscillatory media have many characteristics of an excitable medium. They consist of a large population of self oscillating elements, which are weakly coupled. Depending on the properties of the medium, oscillations can synchronize or desynchronise with time. The os-... 

Boissonade etal. consider the chemoelastodynamics of responsive gels in Chapter 9. This chapter is devoted to the spontaneous generation of mechanical oscillations by a responsive gel immersed in a reactive medium away from equilibrium. Two important cases are considered. In the first case, the chemomechanical instability is mainly driven by a kinetic instabiUty leading to an oscillatory reaction. The approach is applied to the BZ reaction. The second case is a mechanical oscillatory instability that emerges from the cross-coupUng of a reaction-diffusion process and the volume or size responsiveness of the supporting material. In this case, there is no need for an oscillatory reaction. Bistable reactions, namely, the chlorite-tetrathionate (CT) and the bromate-sulfite (BS) reactions, were chosen... 

Manna, S.S., Das, S., Jana, R.N., 2012. Effects of radiation on unsteady MHD free convective flow past an oscillating vertical porous plate embedded in a porous medium with oscillatory heat flux. Adv. Appl. Sci. Res. 3, 3722-3736. 

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