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. character evidence is generally not admissible if proffered for propensity purposes to prove an action. 2. character is a generalized description of a person's disposition or one's peacefulness. These rules ONLY apply to PARTIES and VICTIMS. Witnesses are treated different under the 600's of the rules.