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.
One technique that many writers use with success is to create a character profile for the main characters in the novel. The purpose of a character profile is twofold: to assist the writer in creating a character that is as lifelike as possible and to help with continuity issues in the story. Character Profile is just meant to be a guide where you can list facts and details to help you get to know your characters, especially if you get stuck on one character who doesn't quite seem real.