Transcranial Doppler (TCD), first described in 1982 [1], is a noninvasive ultrasound (US) study that involves the use of a low-frequency (â¤2 MHz) transducer probe to insonate the basal cerebral arteries through relatively thin bone windows.
Details. as.character and is.character are generic: you can write methods to handle specific classes of objects, see InternalMethods. Further, for as.character the default method calls as.vector, so dispatch is first on methods for as.character and then for methods for as.vector.
What is Method Acting. If one listens to either its critics or supporters Method Acting is described as a form of acting where the actor mystically âbecomesâ the character or tries to somehow literally live the character in life. Like all clichÃ©s, both explanations are false.