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.
The balance of these components within the soul of each man, and the way one or another predominates over others, is what makes a character unique and sets apart one individual from another. It should not be thought, however, that character is synonymous merely with personal tastes, temperaments, and preferences.