The influence of surface roughness on friction-induced oscillations due to non-conservative coupling is investigated. classical model extended by a stochastic friction coefficient which modeled as colored noise. Two coupled and parametrically excited differential equations are obtained. almost sure stability analyzed means the top Lyapunov exponent Λ1 indicates instability in case > 0 asymptoti...

In this paper, we consider the relativistic effects of rotation in magnetospheres γ-ray pulsars. The paper reviews progress achieved field during last three decades. For purpose, examine direct centrifugal acceleration particles and corresponding limiting factors: constraints due to curvature radiation inverse Compton scattering electrons against soft photons. Based on obtained results, generat...

and electron plasma frequency, respectively, and b b v c is the directed ion beam velocity normalized to the speed of light. The electromagnetic field perturbations excited by the ion beam pulse in this regime are calculated analytically, and verified by comparison with the numerical simulations. The degrees of beam charge neutralization and current neutralization are estimated, and the transv...

The proposed 1-MW neutron spallation source is a rapidcycling synchrotron (RCS) with a design intensity of 1:04 10 protons. A H beam from the linac is injected into the synchrotron via the charge exchange process. Due to the high intensity of the beam, the minimization of beam loss is one of the primary concerns. In this paper, we study a possible beam loss associated with ®eld ionization, whic...

Ongoing developments in nanotechnology demand higher spatial resolution and thus, amplitude sensitivity Atomic Force Microscopy (AFM). In this work, active cantilevers with integrated sensor actuator systems are parametrically excited using a novel, analog feedback circuit. With that it is possible to adapt the strength sign of cubic nonlinearity which provides bound amplitudes resonance operat...