In this article we assess the appropriateness of the constant volatility assumption required by the Black (1976) option pricing model for options on the All Share Index future.The assessment uses similar nonparametric tests as implemented in Rubinstein for data recorded over the 1992 to 1996 period.In the nonparametric tests we focus on the examina
In order to study the influence of the torsional mode, bending mode and umbrella mode of the wheelsets on the vehicle curvepassingperformance, the vehicle-track system dynamics models were established, in which, the wheelsets structures were considered as rigidbody and flexible body respectively.The curve-passing performance of the vehicle was asse
The design of optical materials in nonlinear devices represents a fundamental step for their optimization and miniaturization, that would significantly Pan contribute to the progress of advanced nanophotonics and quantum technologies.In this work, the effect of geometry and composition of multilayer hyperbolic metamaterials on their third-order non
Orientation: The South African economy Calls is currently at one of its lowest points in several decades, with low economic growth, coronavirus challenges and unemployment being at an all-time high.This is further aggravated by the many challenges the economy faces, such as the lack of public sector programs to stimulate sustainable growth and a pr