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
Focalin is essentially an improved, cleaner version of Methyphenidate (Ritalin) that typically lasts a bit longer with slightly decreased side effects. Compared to Ritalin, it appears to be less prone to causing sleep or appetite disturbance.