Dynamics, control, and stability of roll oscillations a biased ship in regular sea waves are investigated. The under oscillation is modelled as the classical Helmholtz–Duffing oscillator with strongly nonlinear asymmetric restoring moment characteristics. incremental harmonic balance method, amended pseudo-arc-length continuation approach, employed to obtain uncontrolled controlled frequency re...

This chapter presents an overview of the latest artistic portrait rendering techniques. Artistic rendering or portraits can be viewed as an image generating process controlled by two factors. The first one is the face fidelity, namely, a rendered portrait image should preserve a certain amount of the original face’s information. The second factor is the artistic style, for example, sketch, pain...

adaption of metaphor and allusion has been always considered as the most valuable literary representations and seved as an appropriate device for benchmarking versification potential in poets. as one of shiite poets, seyed hemyari who has devoted his verse for defense from al-ul-bayt (pbut) has benefitted successfully from rhetoric images in this field. despite of its simplicity and plainness i...

Polygonal hybrid systems (SPDI) are a subclass of planar hybrid automata which can be represented by piecewise constant differential inclusions. The reachability problem as well as the computation of certain objects of the phase portrait, namely the viability, controllability and invariance kernels, for such systems is decidable. In this paper we show how to compute another object of an SPDI ph...

Taking a portrait picture is frequently an uncomfortable task for the photographed person, and the resulting shots are in many cases unnatural and unsatisfactory. A common solution is to take a large number of pictures and then select the favorite ones. Instead of a manual selection, an automatic selection of good portraits from a captured video sequence can increase the chances to obtain a ple...

Toad ventricles were externally driven by periodic pulses while monophasic action potential (MAP) signals were recorded in seven excised and seven in situ ventricles. As the frequency was slowly increased in steps, the stimulated tissue displayed several dynamic characteristics. Hierarchies of periodic behavior, like phase-locking and period-doubling sequences leading to chaos, were observed. R...

In this paper we perform a global analysis of the dynamics of the Chen system ẋ = a(y − x), ẏ = (c− a)x− xz + cy, ż = xy − bz, where (x, y, z) ∈ R and (a, b, c) ∈ R. We give the complete description of its dynamics on the sphere at infinity. For six sets of the parameter values the system has invariant algebraic surfaces. In these cases we provide the global phase portrait of the Chen system an...

A great advance in physics came when it was realized that it was better to think about motion in empty space rather than starting with what happen in the “real world” with gravity pulling things downwards, friction slowing things down, etc. First, that the laws of physics should be the same at one point as at another, i.e. that they are translation invariant, and also from one day to another, i...

A great advance in physics came when it was realized that it was better to think about motion in empty space rather than starting with what happen in the “real world” with gravity pulling things downwards, friction slowing things down, etc. First, that the laws of physics should be the same at one point as at another, i.e. that they are translation invariant, and also from one day to another, i...