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
ritalin is a stimulant although it can have effects that are opposite from what would be expected of a stimulant while stimulants like caffeine can cause hyperactivity when used at the doses intended for adhd ritalin usually has a calming effect