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
July 3, 2007 -- Ritalin, a drug used to treat attention deficit hyperactivity disorder (ADHD), may not leave long-term side effects on the brain, a new study shows.The Ritalin side effects study, published in The Journal of Neuroscience, was conducted on rats, not people.DHD is typically diagnosed in children, and Ritalin is one of the most commonly prescribed ADHD drugs, Milner's team notes. The researchers injected young male rats with Ritalin for about a month, starting when they were 1 week old, to mimic Ritalin use in people, who take Ritalin by mouth.