Observing the dynamics of compact astrophysical objects provides insights into their inner workings, thereby probing physics under extreme conditions. The immediate vicinity an active supermassive black hole with its event horizon, photon ring, accretion disk, and relativistic jets is a perfect place to study general relativity magneto-hydrodynamics. observations M87* Very Long Baseline Interfe...

Modern power systems present low levels of inertia due to the growing shares converter-interfaced generation. Consequently, renewable energy sources are increasingly requested provide frequency support. In addition, loss, requirements regarding containment reserves (FCR) becoming tough meet with traditional units such as hydro, whose non-minimum phase (NMP) characteristic reduces closed-loop st...

The paper discusses about upgrading the overhead crane anti-sway method base on induction motor torque control from rotor resistance starter to variable frequency drives (VFDs). included two phases. phase 1 is identify performance of operation using (old existing starter). 2 that use a drive (new primary equations connecting tractive force and load sway angle, which law based designed for 0% wo...

In order to reduce the two main vibration frequency of variable speed helicopter, an anti-resonance isolator with double isolation is designed. First, dynamic formula dual was deduced based on traditional theory. With formula, natural frequency, antiresonant and transmissivity are obtained. Then, sensitivity performance efficiency for analyzed. The effects design parameters such as secondary sp...