In this paper the application of piezoelectric quartz tuning forks in dynamic force microscopy is described. For the introduction we give a historical overview and a comparison with traditional cantilevers. In the second section the theories for tuning forks as oscillators for the dynamic force detection are introduced and in the third section the experimental implementation is described. This ...

We consider torsional oscillations of magnetars. This problem features rich dynamics due to the strong interaction between the normal modes of a magnetar’s crust and a continuum of Magneto-Hydro-Dynamic (MHD) modes in its fluid core. We study the dynamics using a simple model of a magnetar possessing a uniform magnetic field and a thin spherical crust. Firstly, we show that global torsional mod...

The study of boundary layer flow and heat transfer of an electrically conducting visco-elastic second grade fluid in a porous medium past a stretching sheet is conducting with power law surface temperature or power law surface heat flux. The flow in boundary layer is considered to be generated solely by the linear stretching of the boundary sheet adjacent to porous medium in a magnetic field wi...

Abstract Structural, half-metallic, magneto-optic, and thermoelectric properties of CrTiZ (Z = As, P) half-Heusleres compounds are investigated based on density functional theory. These have mechanical stability in the ferromagnetic state with a high bulk modulus. They often half-metallic large integer magnetic moment very attractive spintronics, magneto-optics applications. The moments CrTiAs ...

A new fail-safe, variable stiffness, and variable damping isolator (VSDI) device is designed, developed and tested utilizing magneto-rheological elastomers (MREs). This system provides a simultaneous controllable stiffness and damping. The performance of the VSDI is investigated experimentally under dynamic shear loads. The results demonstrate that this VSDI is capable of increase of stiffness ...

We present an approximate method for solving nonlinear control problems over long time horizons, in which the full model is preserved initial part of horizon, while remainder horizon modeled using a linear relaxation. As this problem may still be too large to solve directly, we Benders decomposition-based solution algorithm that iterates between and parts horizon. This extends dual dynamic prog...