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
After five half-lives, only about 3 percent of the medication remains in your body. The half-life for Ritalin in children is about 2.5 hours on average. In adults, the half-life is about 3 to 3.5 hours on average. Keep in mind that these numbers are averages.