in the present paper the linear oscillator in r3 with z =constanthas been considered. the aim is to determine the necessary conditions forthe persistence of periodic solutions under discontinuous perturbations. a newapproach based on a computational method has been used. at the end weapply our method on an example.

Silica is considered one of the most prevalent components in Earth’s shell and synthesized for use technological applications. Nevertheless, new methods finding a better, cheaper, more ecologically friendly supply silica with less energy consumption are unavoidable. This study investigates whether nanopowders made from waste great amount (fly ash glass) can be utilized as fillers an epoxy glue ...

Construction in the field can often be encountered with various problems, one of which is damage to concrete structures or non-concrete that affect weakening a structure. Many developed countries have carried out polymer mortar development efforts. Until now, still ongoing reduce use cement and anticipate global warming. One them by utilizing as an adhesive substitute for so strong produced sho...

Rosetting and non-rosetting lymphocytes collected from normal individuals were stained for the presence of beta-glucuronidase, periodic-acid Schiff activity, gamma glutamyl transpeptidase, acid phosphatase, and alpha-naphthyl butyrate esterase. Lymphocytes which formed rosettes with sheep erythrocytes and non-rosette forming lymphocytes contained cytochemical reaction products for all five stai...