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.
1 Online manual FrameMaker Character Sets (Windows) his manual lists the character sets used for FrameMaker 7.0 documents using Western fonts, and shows how to type each character in the set.About character sets FrameMaker 7.0 uses three kinds of character sets. Online manual FrameMaker Character Sets (Windows) his manual lists the character sets used for FrameMaker 7.0 documents using Western fonts, and shows how to type each character in the set.