K. Ratnavelu

Positron scattering from hydrogen atom with screened Coulomb potentials

Elastic positron-hydrogen collisions with screened Coulomb potentials have been investigated using a second-order distorted wave Born approximation in the momentum space. Two types of potentials have been considered, namely, static screened Coulomb potential and exponential cosine-screened Coulomb potential. Using a simple variationally determined hydrogenic wave function it has been possible to obtain the scattering amplitude in a closed form. A detailed study has been made on the differential and total cross sections in the energy range 20–300 eV.

Sliding mode control for generalized robust synchronization of mismatched fractional order dynamical systems and its application to secure transmission of voice messages

This paper proposes a generalized robust synchronization method for different dimensional fractional order dynamical systems with mismatched fractional derivatives in the presence of function uncertainty and external disturbance by a designing sliding mode controller. Based on the proposed theory of generalized robust synchronization criterion, a novel audio cryptosystem is proposed for sending or sharing voice messages secretly via insecure channel. Numerical examples are given to verify the potency of the proposed theories.

Robust stability analysis of delayed Takagi-Sugeno fuzzy genetic regulatory networks

In this paper, the nonlinear model of genetic regulatory networks is described by the Takagi‐Sugeno fuzzy model representation with time-varying delays. Due to the highly complicated nonlinear stability and robust stability problems, a fuzzy approximation method is employed to interpolate several linear genetic regulatory networks at different operation points via fuzzy bases to approximate the nonlinear genetic regulatory network. In this context, the methods of the linear matrix inequality (LMI) technique could be employed to simplify the problems related to robust stability of genetic regulatory networks. Further, by involving triple integral terms in Lyapunov‐Krasovskii functionals and LMI techniques, the stability criteria for the delayed fuzzy genetic regulatory networks are expressed as a convex combination of LMIs, which can be solved numerically by any LMI solvers. Several numerical examples are given to verify the effectiveness and applicability of the derived approach.

An audio encryption based on synchronization of robust BAM FCNNs with time delays

In this work, authors’ proposed an audio encryption based on synchronization of hybrid bidirectional associative memory (BAM) and fuzzy cellular neural networks (FCNNs) with time delays. Here, the significant effort is to find the values of the parameters A,B,D,α,β,Ã,B~,D~,α~,β~,L,L~,

Do contractors undertake more learning and innovation than multinational subsidiaries at least developed host-sites? A study of clothing firms in Cambodia

A,\ B,\ D,\ \alpha ,\ \beta ,\ \tilde {A},\ \tilde {B},\ \tilde {D},\ \tilde {\alpha },\ \tilde {\beta },\ L,\ \tilde {L},

Theoretical and practical applications of fuzzy fractional integral sliding mode control for fractional-order dynamical system

Od,Õd,Oa,Õa,Ob,Õb,

Sliding mode control design for synchronization of fractional order chaotic systems and its application to a new cryptosystem

O_{d}, \ \tilde {O}_{d},\ O_{a}, \ \tilde {O}_{a},\ O_{b}, \ \tilde {O}_{b},

Magnetoresistivity model and ionization-energy approximation for ferromagnets

of the given robust BAM FCNNs system to obtain the dynamical signal (chaotic) which are used to encrypt an audio file and satisfy the condition of Linear matrix inequality (LMI) by choosing suitable Lyapunov-Krasovskii functional (LKF). Further, the key sensitivity of order 10−10

Diffusion Trajectories of Emerging Sciences in Malaysian R & D System

10^{-10}

Electron impact excitation of 2p and 3p states of hydrogen at intermediate energies

of this proposed method have massive key space to make brute-force attack infeasible. Numerical simulations, results and discussions along with comparison are provided to illustrate the effectiveness and merits of the proposed scheme.