Cubic–Quartic Optical Solitons with Differential Group Delay for Kudryashov’s Model by Extended Trial Function

Journal of Communications Technology and Electronics - This paper implements mathematically rigorous extended trial function algorithm to address cubic–quartic optical solitons in...     

Bright,dark, and singular solitons in optical fibers with spatio-temporal dispersion and spatially dependent coefficients

Abstract

Investigated in this work is the nonlinear Schrödinger equation with space-dependent parameters, which models the propagation of optical solitons in spatially inhomogeneous optical fiber with detuning, spatiotemporal dispersion, intermodal dispersion, and fiber gain or loss. Through the ansatz scheme, analytical bell, kink, and singular soliton solutions under certain coefficient constraints are obtained.     

Steroid hormone signalling system and fungi

Three components of the steroid hormone signalling system, 17 beta-hydroxysteroid dehydrogenase, androgen binding proteins and steroid hormone signalling molecule testosterone were determined in the filamentous fungus Cochliobolus lunatus for the first time in a fungus. Their possible role in C. lunatus is discussed in comparison with their role in mammalian steroid hormone signalling system. The results are in accordance with the hypothesis, that the elements of primordial signal transduction system should exist in present day eukaryotic microorganisms.     

Mechanisms in oxide-carbide ceramic BOK 60 grinding

The paper presents an experimental study of micro-cutting intended to aid the optimization of the grinding process of the oxide–carbide ceramic BOK 60. The necessity for investigating the mechanisms occurring between the abrasive material and the ceramic is imposed by the fact that grinding is the dominant technology used to achieve the required quality of the workpiece surface finish. The investigations were carried out to determine the normal and tangential cutting forces, the critical penetration depth, and the crack generation angle on the workpiece surface as a function of the grain penetration speed and depth. The micro-cutting process was performed with a single diamond cone-shaped grain at varying depths of cut. It was found that the critical grain penetration depth separating ductile flow from brittle fracturing ranges from 3 to 5?μm, while radial cracks on the ceramic’s surface are distributed at an angle from 35° to 75°, measured relative to the direction of the diamond grain’s motion.     

Highly dispersive optical solitons with a polynomial law of refractive index by Laplace–Adomian decomposition

Journal of Computational Electronics - This paper presents a numerical study of highly dispersive optical solitons that maintain a cubic–quintic–septic nonlinear (also know as...