Damping of elastically supported element in a vacuum tube

The Demon in a Vacuum Tube

In the present paper, several issues concerning the second law of thermodynamics, Maxwell’s demon and Landauer’s principle are dealt with. I argue that if the demon and the system on which it operates without dissipation of external energy are made of atoms and molecules (gas, liquid or solid) in thermal equilibrium (whose behaviour is described by a canonical distribution), then the unavoidabl...

Vacuum Tube Amplification

Designing Vacuum Tube Circuits

Estimates of Europa’s Ice Shell Thickness from Elastically-supported Topography

The thickness of Europa’s solid ice shell is uncertain, and has important implications for Europa’s habitability and thermal history. Here we obtain an estimate for the ice shell thickness from observations of a plateau SW of Cilix impact crater (3◦N, 182◦W ). A shell thickness of ≈ 25 km is compatible with our observations; a conservative lower bound is 6 km. Fig 1 shows a Galileo image of the...

Specific Features of Aerodynamic Journal Bearings with Elastically Supported Pads

Aerodynamic bearings with elastically supported tilting pads have operational properties comparable with widely-used foil journal bearings. They combine the excellent stability of tilting pad bearings, as a result of very small cross-coupling stiffness terms, with the positive properties of foil bearings, namely their ability to adapt to changing operating conditions and presence of additional ...