experiments in television that had been interrupted were resumed, and it also became an important home entertainment broadcast medium. thermionic valves[ edit ] the type of device known as a thermionic tube or thermionic valve uses the phenomenon of thermionic emission of electrons from a heated cathode...
strongly influenced by the chemical composition and/or microstructure at the surface. in terms of composition, we have shown that the incorporation of small amounts of biologically significant elements (such as ca, si, mn, etc.) into bioinert ceramics can stimulate bone ingrowth into ceramic single tubes...
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