> A diode is a practical electronic form of 
> Smoluchowski's trapdoor.


http://books.google.com/books?id=VNKCsQt75_UC&pg=PA94&lpg=PA94&dq=smoluchowski's+trapdoor&source=web&ots=WUr71jUc4Q&sig=fjzPvi0qqKvQDIfRyvZ2HuvtunM#PPR7,M1

page 93 and beyond

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