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.
A character set is specified when creating a database, and your choice of character set will determine what languages can be represented in the database. This choice will influence how you create the database schema and develop applications that process character data.haracter Set Conversion. If you choose a character set that is different from what is available on the operating system, Oracle can handle character set conversion from the database character set to the operating system character set.