This paper discusses the static stability concepts of airplanes. The definition of static stability has not been systematically discussed. For example, although “Cmα < 0,” “C β < 0,” and “Cnβ > 0” are merely the aerodynamic criteria corresponding to each static stability, they are used just like the definition of static stability. Moreover, “flight path stability” is well known as the static st...

In this paper, stability of slopes with a shallow foundation located on top including the shape of the failure mechanism is investigated in static and seismic states. This is a three dimensional problem which is analyzed two dimensionally because 3D analyses are complex and appropriate softwares are not available. The conventional method of bearing capacity evaluation of foundations on top of ...

background: multiple sclerosis (ms) is a chronic disease characterized by degradation of the central nervous system myelin which may impair the balance of patients. core stability exercises have been the focus of attention for repairing the stability of some patients.   objectives: to assess the effect of core stability exercise on the balance of patients with multiple sclerosis. materials and ...

The static voltage stability and the dynamic voltage stability are integrated. To consider a shunt compensator and/or a more general load which is dependent on voltage, a modified criterion for the static voltage stability is developed and the system is controlled to satisfy this static Stability criterion. For an accurate analysis of the dynamic voltage stability, the system model includes exc...