Switching of behavior: From hyperchaotic to controlled magnetoconvection model

Abstract

The switching of behavior, from the hyperchaotic to controlled magnetoconvection model, is studied by a feedback control technique. The magnetoconvection model shows hyperchaotic oscillations for different values of parameters: Rayleigh number r, Chandrasekhar number Q, and diffusivity ratio l. Chaotic responses of the magnetoconvection model are considered through boundedness and Lyapunov exponents to specify the place where the controller needs to be applied. The controller for the magnetoconvection model is calculated by using the concept of the Lie derivative, which is the most significant facet of control analytical techniques. Speed and dislocated feedback techniques are also utilized with the consideration of stability analysis through feedback gains. To show the advantages of the feedback control technique, we give a comparison with other control techniques such as speed and dislocated feedback techniques. Simulation results indicate that the analytical strategy for controlling the oscillation is effective and controlled within a small duration of time.

Device simulation and optimization of HTL-free perovskite solar cell with CH3NH3SnBr3 as the absorber layer using solar cell capacitance simulator software

“…Organo metal halide perovskites rapidly revolutionised the development of photo voltaic technology [1]. These materials have remarkable optoelectrical properties, such as tuneable bandgaps, high absorption coefficient, long carrier diffusion lengths and high charge carrier mobilities [2].…”

“…HTL and ETL are the components of the planar structure (p-i-n and n-i-p) of perovskite solar cells, which aid in the collection and transportation of the holes and electrons generated, in their respective electrodes [11]. The HTL-free solar device is a new concept in the PV world which reduces the interface defect and fabrication cost without affecting the cell performance [1]. Hao, Liangsheng, et al [12] attained an efficiency of 20.45% for HTL-free FTO/ CH 3 NH 3 SnI 3 /C 60 /Au inverted structure in their simulation work.…”

“…Hao, Liangsheng, et al [12] attained an efficiency of 20.45% for HTL-free FTO/ CH 3 NH 3 SnI 3 /C 60 /Au inverted structure in their simulation work. Sunny, Adil, et al [1] modelled HTL-free PSC with the structure of FTO/TiO 2 /CH 3 NH 3 SnI 3 /Ni/glass and obtained an efficiency of 26.33%. Even though CH 3 NH 3 SnI 3 is a promising solar cell material from the band gap point of view, the optical properties of CH 3 NH 3 SnBr 3 make it a better absorber material [13].…”

Hopf Bifurcation, Periodic Solutions, and Control of a New 4D Hyperchaotic System

“…Pecora [22] proposed that high-dimensional hyperchaotic systems are safer than chaotic systems because of their increased randomness and higher unpredictability. From a practical application and engineering point of view, hyperchaotic systems should have a higher level of complexity [23]. Although analytical tools and techniques are available in the literature for bifurcation and stability analysis [24,25], no such analytical tools are available for attractors, so we must rely on some graphical tools.…”