The classical example of thermionic emission is the emission of electrons from a hot cathode into a vacuum (also known as thermal electron emission or the Edison effect) in a vacuum tube. The hot cathode can be a metal filament, a coated metal filament, or a separate structure of metal or carbides or borides of transition metals.
Low confidence regions are areas for which there s a small amount of DNA evidence found in your sample. All ethnicities with predicted percentages of less than 4.5% appear as low confidence regions. Inferior complex is low complex .
DNA ancestry tests branded 'meaningless'. Commercial DNA tests that claim to tell people whether they are related to Richard III or descended from the Vikings are no more than genetic astrology, scientists have warned. Research found germ cells of teenage fathers had more DNA flaws than those of fathers in their 20s Photo: Alamy.