During hurricane events, large stress cycles from the non-stationary wind and dynamic vehicle loads could possibly induce damage initiations and propagations. Utilizing the non-stationary wind field modeling techniques and the recent developed vehicle-bridge-wind dynamic analysis framework, this paper initiates the bridge fatigue damage assessment of bridges under vehicle and non-stationary ext...

If the noise »t in the state space representation of a superdiagonal bilinear model BL(p; q; p; q) is non-stationary, then the time series generated by this model will be non-stationary. In this paper, it is shown that the existence theorems and the invertibilty condition of the non stationary model is similar to the stationary case. Furthermore, it is shown that the e®ect of the non-stationary...

a complete linear theory in four dimensional space-time is constructed for propagation and coupling of electromagnetic waves in the most general case, i.e. media where all three space directions are in homogeneous and where temporal changes, anisotropy and absorbtion are also included. the only condition is that the properties of the medium should be slowly varying, although it is assumed that ...

Introduction: The purpose of this study is to investigate the effects of grid and non-grid techniques in the lateral cervical spine radiography on image quality and entrance surface dose (ESD). Although image quality and radiation doses have been studied by researchers, there is still a dearth of information on image quality and patient dose with different techniques. Material and Methods: The...