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...timber is subjected to forces perpendicular to the grain and/or [[tension (physics)|tension]] than where under load along the grain and/or [[physical compress ...oken off or fall off. Subsequent growth of wood may completely conceal the stubs which will however remain as knots. No matter how smooth and clear a log is

...electrical [[transmission line]] will be partly, or wholly, [[reflection (physics)|reflected]] back in the opposite direction when the travelling signal enco ...phenomenon can also be made use of in such devices as [[stub (electronics)|stubs]] and [[quarter wave impedance transformer|impedance transformers]].

...filter]]s can be brought to bear. The equivalents of [[stub (electronics)|stubs]] and [[quarter wave impedance transformer|impedance transformers]] are bot ...oks?id=HmNZuy053foC ''Piezoelectricity''], New York: American Institute of Physics, 1992 ISBN 0-88318-647-0.

...ates into a [[External electric load|load]], the maximum possible [[Power (physics)|power]] is delivered to the load when the impedance of the load ([[load im ...ters) use tuned [[Electronic filter|filters]] such as [[Stub (electronics)|stubs]] to match impedances at specific frequencies. These can distribute differe