Sharaxaad Gaaban:

Beddelayaasha u dhowaanshaha birlabta waxaa ka mid ah badhanka u dhowaanshaha hadda ee eddy, badhanka u dhowaanshaha awoodda, badhanka u dhowaanshaha hoolka, badhanka u dhowaanshaha sawir-qaadista, badhanka u dhowaanshaha pyroelectric, badhanka magnetic TCK iyo badhanka kale ee u dhowaanshaha. Sababtoo ah dareemaha barokaca waxaa lagu samayn karaa iyadoo la raacayo mabaadi'da kala duwan iyo habab kala duwan, dareemayaasha kala duwan ee barokacana waxay leeyihiin habab "aragti" oo kala duwan oo shayga ah, waxaa jira dhowr badhanka u dhowaanshaha oo caadi ah: badhanka u dhowaanshaha hadda ee eddy.