This paper deals with the basic notions of k-tautimmersions . These notions come from two special cases; that is, tight and taut immersions. Tight and taut based on high and distance functions respectively and their basic notions are normal bundle, endpoint map, focal point, critical normal. We generalize hight and distance functions to cylindrical function and define basic notions of k-taut ...

This research aims to statistically investigate seismo-ionospheric influence related strong earthquakes with different focal mechanisms. The nighttime O+ density and electron density, measured by the CSES satellite for about 3 years DEMETER 6 years, were utilized globally search ionospheric perturbations datasets. Data on M ≥ 6.0 mechanism information within a ±45° geographic latitude collected...