Based on the mechanism of heat generation at the welding interface, welding methods for thermoplastics can be classified as external and internal heating methods, as shown in Fig 1. Fig. 1. Classification of welding methods for semi-finished polymeric materials.
ritalin is the brand name of the drug methylphenidate hydrochloride doctors prescribe ritalin to treat attention deficit hyperactivity disorder adhd and a sleep disorder known as narcolepsy
Methylphenidate, sold under various trade names, Ritalin being one of the most commonly known, is a central nervous system stimulant of the phenethylamine and piperidine classes that is used in the treatment of attention deficit hyperactivity disorder and narcolepsy. The original patent was owned by CIBA, now Novartis Corporation. It was first licensed by the US Food and Drug Administration in 1955 for treating what was then known as hyperactivity. Medical use began in 1960; the drug has become