In this paper, vibrations and bifurcation of a damped system consists of a mass grounded by linear and nonlinear springs and a nonlinear damper is studied. Nonlinear equation of motion is derived using Newton’s equations. Approximate analytical solutions are obtained using multiple time scales (MTS) method. For free vibration, the approximate analytical results are compared with the numerical i...

The occurrence of system separations in the power Continental Europe has been observed recent decades as a critical event which might cause imbalances higher than reference incident specified per design, representing an actual challenge for stability and safe operation system. This work presents analysis simulations primary frequency control synchronous area conditions separation. adopted appro...

introduction and aims: we noticed in our practice that the patients with ulcerative colitis (uc) who have developed primary sclerosing cholangitis (psc) experience a milder course of colonic disease. our objective in this study was to define whether there is any difference between uc activity and its course in patients with and without psc. materials and methods: 19 patients with uc and psc (8 ...

In a modern power system, to realize the safe operation of units and maintain frequency stability network, various means modulation can be adopted. However, there are some deficiencies in real-time monitoring assessment management primary (PFM). To solve these problems, PFM online method based on “master–sub” control station model wide area measurement system (WAMS) is proposed as strategy supp...