STUDY ON THE OPTIMAL DESIGN OF MISTUNED BLADED DISK (SIMULTANEOUS OPTIMIZATION OF FORCED AND SELF-EXCITED VIBRATION AND AMOUNT OF UNBALANCE)

Study on the optimal design of mistuned bladed disk (Simultaneous optimization of forced and self-excited vibration and amount of unbalance)

Although bladed disks are nominally designed to be cyclically symmetric (tuned system), the vibration characteristics of all blades on a disk are slightly different due to the manufacturing tolerance, deviations in the material properties, and wear during operation.These small variations break the cyclic symmetry and split the eigenvalue pairs.Blad

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New early Pliocene owls from Langebaanweg, South Africa, with first evidence of Athene south of the Sahara and a new species of Tyto

The fossiliferous Upper Varswater Formation at Langebaanweg (South Africa) produced remains of at least five species of owls (Strigiformes).Tyto richae sp.nov.is the first palaeospecies of Tytonidae described from an African fossil site, though indeterminate remains referable to the genus Tyto are known from the Middle Miocene of Morocco, Sofa Cush

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Will Posthumanism be the End of the Homo Sapiens Era?

The purpose of the Unmanaged Switches article is to answer the question whether posthumanism is the end of the homo sapiens era.The multitude of posthumanisms can be reduced to two main views: cultural posthumanism and techno-humanism.Cultural posthumanism postulates a change in the image of man, while technological posthumanism postulates his enha

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