the s-transform has widely been used in the analysis of non-stationary time series. a simple method to obtain depth estimates of gravity field sources is introduced in this study. we have developed a new method based on the spectral characteristics of downward continuation to estimate depth of structures. this calculation procedure is based on replacement of the fourier transform with the s-tra...

A theorem of J. Hersch (1970) states that for any smooth metric on S2, with total area equal to 4π, the first nonzero eigenvalue of the Laplace operator acting on functions is less than or equal to 2 (this being the value for the standard round metric). For metrics invariant under the standard S1-action on S2, one can restrict the Laplace operator to the subspace of S1-invariant functions and c...

abstract background: most of the studies about parenting stress among parents of children with autistic spectrum disorder (asd) have been conducted in western societies. the objective of this research, conducted in iran, is to evaluate the parenting stress among fathers and mothers of children with asd and fi nd the correlation between severity of the disorder in children and the level of paren...

We study $S$-adic shifts generated by sequences of morphisms that are constant-length. call a sequence constant-length torsion-free if any prime divisor one the lengths is infinitely many lengths. show