Abstract Diffractions are seismic waves generated by small-scale heterogeneities in the subsurface. These often superimposed strong reflections so that they not visible on image, leading to misinterpretation and incorrect localization of scatterers. Therefore, separation diffracted reflected is a crucial step identifying these diffractors. To realize diffraction imaging, least-squares reverse t...

The Lee-Carter model and its extensions are the most popular methods in field of forecasting mortality rate. But, spite introducing several different rate so far, there is no general method applicable to all situations. Singular Spectrum Analysis (SSA) a relatively new, powerful non parametric time series analysis that capability has been proven various sciences. In this paper, we investigate f...

how to cite this article: babaknejad n, sayehmiri f, sayehmiri k, mohamadkhani a, bahrami s. the relationship between zinc levels and autism: systematic review and meta-analysis. iran j child neurol. autumn 2016; 10(4):1-9.   abstract objective autism is a complex behaviorally defined disorder. there is a relationship between zinc (zn) levels in autistic patients and development of pathogenesis...

We consider singular block operator problems of the type arising in the study of stability of the Ekman boundary layer. The essential spectrum is located, and an analysis of the L2 solutions of a related first order system of differential equations allows the development of a Titchmarsh–Weyl coefficientM (λ). This, in turn, permits a rigorous analysis of the convergence of approximations to the...