Interrupted pumpdown of a vacuum system

a study on construction of iranian life tables: the case study of modified brass logit system

چکیده ندارد.

Interrupted separatrix excitability in a chemical system

Models of excitability fall into two broad categories: one with a sharp threshold, the other with a narrow but finite threshold region. In an attempt to clarify the notion, we have studied the application of two models of excitability to experiments on a variant of the BelousovZhabotinskii reaction in a well-stirred reactor. An interrupted separatrix model, which has a sharp threshold, is found...

A THEORY OF VACUUM TUNNELING MICROSCOPY1

A theory for tunneling between a real surface and a model probe tip, applicable to the "scanning tunneling microscope" is presented. The tunneling current is found to be proportional to the local density of states of the surface, at the position of the tip. It can be shown that the tunneling conductance has exponential dependence on the distance of the nearest approach to the surface

Using a closed drainage system without vacuum.

Vacuum Regulation with a VFD Controller: Preliminary Tests and Modeling of the Vacuum System

Using a variable frequency drive (VFD) in order to drive the vacuum pump of a milking machine allows a dramatic reduction in energy use, while still producing equivalent vacuum stability. The VFD technology is able to adjust the rate of air removal from the milking system by changing the speed of the vacuum pump motor. A PID controller was developed in order to command the electric motor drivin...