We have performed a quantum mechanical analysis of travelling-wave parametric amplifiers (TWPAs) in order to investigate five experimental phenomena related their operations, namely the effect impedance mismatch, presence upper idler modes, and thermal noise, generation squeezed states, preservation pre-squeezed states during amplification. Our uses momentum operators describe spatial evolution...

performance of the fiber optic networks with different physical topologies such as point-to-point, bus, ring and star, with respect to requirements as bit rates, topology structure, bit. error rate (ber) and optical component characteristics including optical amplifiers, filters, sources and detectors, are analyzed and simulated. for this purpose, maximum number of supportable nodes and throug...

This paper reflects the implementation of a reliable technique which is called $left(frac{G'}{G}right)$-expansion  ethod for  constructing exact travelling wave solutions of nonlinear partial  differential equations. The proposed algorithm has been successfully tested on two two selected equations, the balance numbers of which are not positive integers namely Kundu-Eckhaus equation and  Derivat...

Travelling waves are a feature of many spatio-temporal series. The use of single side band filtering and the complex singular value decomposition to isolate such waves is described. As with other applications of the singular value decomposition, such as principal components, the results can be difficult to interpret. In the case of travelling waves, however, a dynamic graphical display using co...

Introduction At high magnetic field strengths, travelling wave MRI can be used to solve the standing wave problem of volume resonators [1]. However, travelling wave MRI suffers from electromagnetic field-attenuation and high whole body energy deposition (SAR), so that only the distal parts of the body can be imaged. In this work we introduce a new travelling wave RF coil. The coil guides the tr...

BACKGROUND How does the cochlea analyse sound into its component frequencies? In the 1850s Helmholtz thought it occurred by resonance, whereas a century later Békésy's work indicated a travelling wave. The latter answer seemed to settle the question, but with the discovery in 1978 that the cochlea emits sound, the mechanics of the cochlea was back on the drawing board. Recent studies have raise...

In this paper, a improved method named the integral bifurcation is introduced. In order to demonstrate its effectiveness for obtaining travelling waves of the nonlinear wave equations, we studied the modified equal width wave equation and its variants by this new method. Under the different parameter conditions, many integral bifurcations are obtained. According to these integral bifurcations, ...

We study periodic travelling waves in the Theta model for a linear continuum of synaptically-interacting neurons. We prove that when the neurons are oscillatory, at least one periodic travelling of every wave number always exists. In the case of excitable neurons, we prove that no periodic travelling waves exist when the synaptic coupling is weak, and at least two periodic travelling waves of e...