The semiconductor industry has surpassed the traditional steel industry and automobile industry and become a high value-added and high-tech industry in the 21st century. Semiconductors are the core of many industrial equipment, which are widely used in the core fields of computers, consumer electron...
Vacuum evaporation is a major production process in light chemical industry. Its working principle is a physical process: the evaporation rate of the solvent in the solution is related to the external resistance. Under vacuum conditions, the boiling point of the solution decreases, and the resistanc...
Abstract: as an important component of the helium mass spectrometer leak detector, the geometric parameters of the composite molecular pump not only affect the pumping performance, but also affect the detection performance of the leak detector. Based on the basic theory of molecular pump pumping, th...
