Statistical and localization properties of dipole eigenmodes ~plasmons! of fractal and random nonfractal clusters are investigated. The problem is mathematically equivalent to the quantum-mechanical eigenproblem for vector ~spin-1! particles with a dipolar hopping amplitude in the same cluster. In fractal clusters, individual eigenmodes are singular on the small scale and their intensity strong...

In today world of advancement, it is mandatory task to share, distribute and exchange the information like image, speech, text files throw public wired/wireless networks. Therefore, security gains more and more importance especially in those organizations where information is more critical and more important. Instead of using the traditional encryption techniques, Biometrics like speech uniquel...

In this paper, chaotic dynamic and nonlinear control in a glucose-insulin system in types I diabetic patients and a healthy person have been investigated. Chaotic analysis methods of the blood glucose system include Lyapunov exponent and power spectral density based on the time series derived from the clinical data. Wolf's algorithm is used to calculate the Lyapunov exponent, which positive val...

Several proposed chaos based ciphers exploit the ergodic property of chaotic orbits. As chaotic systems are unstable and have sensitive dependence on initial conditions, the main difficulty for the receiver is to reproduce the chaotic signal that has been generated by the sender in order to correctly decrypt the message. This is performed by a self synchronizing device. In discrete cryptography...

We have measured the resistance versus magnetic field and Fermi energy for two stadium-shaped cavities in which chaotic scattering is expected. We fit the power spectra of the magnetoresistance fluctuations to semiclassical chaotic scattering theory and find a characteristic field which scales with cavity dimensions as predicted by classical simulations. Measurements of conductance versus Fermi...

Ultra wideband communications based on chaotic signal is considered for low data rate, ranging application that is under standardization by the task group IEEE 802.15.4a. The current standard works are introduced and the proposed direct chaotic system is introduced. The PHY layer including transceiver, modem, and a ranging function are designed and implemented to realize a communication with lo...

one of the main distinctions between geomaterials and other engineering materials is the spatial variation of their properties in different directions. this characteristic of geomaterials -so called heterogeneity- is studied herewith. several spatial distributions are introduced to describe probabilistic variation of geotechnical properties of soils. among all, the absolute normal distribution ...

An approach is proposed for making chaotic a given stable Takagi–Sugeno (TS) fuzzy system using state feedback control of arbitrarily small magnitude. The feedback controller chosen among several candidates is a simple sinusoidal function of the system states, which can lead to uniformly bounded state vectors of the controlled system with positive Lyapunov exponents, and satisfy the chaotic mec...

One of the major routes to chaotic scattering is through an abrupt bifurcation by which a nonattracting chaotic saddle is created as a system parameter changes through a critical value. In a previously investigated case, however, the fractal dimension of the set of singularities in the scattering function changes continuously through the bifurcation. We describe a type of abrupt bifurcation to ...

Our main contribution in this paper is to investigate the phenomenon of adaptive complete synchronization of two different n-dimensional chaotic complex nonlinear systems with fully uncertain parameters. The idea of an adaptive control technique based on complex Lyapunov function is used to state a scheme to achieve the adaptive synchronization of chaotic attractors of these systems. For illust...