We construct dark energy stars with Chaplygin-type equation of state (EoS) in the presence anisotropic pressure within framework Einstein gravity. From classification established by Iyer et al. [Class. Quantum Grav. 2, 219 (1985)], we discuss possible existence isotropic as compact objects. However, there is possibility constructing ultra-compact for sufficiently large anisotropies. investigate...

Abstract In order to meet the requirements of small moment inertia brushless DC torque motor, optimal design shafting and research on measurement method were carried out basis structure flat motor rotor high-precision sensor. this paper, ProE5.0 software is used model simulate shaft permanent magnet synchronous motor. After comparing common methods inertia, single-wire torsional oscillation tes...