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
In Marilyn Wedge's blog post What We Can Learn From Michael Phelps About ADHD, she writes, Ritalin is a crutch Feeling that the drug was a crutch, Phelps decided to learn to use his mind to focus and control himself in the class room [sic].