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Přesné kmitočtové generátory
Kroupa, Věnceslav František
Reliability and precision of transmitter exciters and receiver local oscillators are indispensable for the reliable transfer of information especially of modern digital communications systems and their widespread application in microwave ranges . In this contribution special microwave oscillators, exhibiting high Q of their resonators such as sapphire cooled sapphire and optical delay line devices will be discussed together with network system enamelling maximum frequency stability.
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Interakce trhliny a kovového substrátu v plasmových keramických nástřicích
Náhlík, Luboš ; Knésl, Zdeněk ; Kroupa, František
Plasma-sprayed ceramic coatings contain a high density of intrasplat microcracks which are responsible for small YoungŽs moduli and low fracture toughness. The extension of an initial surface crack in the direction to the interface, where the crack is repelled by the metal substrate with higher YoungŽs modulus, is studied using the methods of fracture mechanics. It is shown that high tensile stresses induced by the crack in the interface can lead to a local decohesion along the interface so that the crack can deviate into the interface
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