Breaking the bottleneck of product innovation in SMEs

On the one hand, large-scale scientific research instruments that are expensive are idle in the laboratories. On the other hand, small and medium-sized enterprises cannot afford to innovate scientific research instruments. The sharing of scientific research instruments is to resolve this c

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Important regulations for ventilation of wells and tunnels

(1) Wind quality and wind speed requirements in the roadway 1. In the inflow of the mining face, the oxygen concentration is not less than 20%, and the carbon dioxide concentration is not more than 0.5%. 2. The concentration of harmful gases does not exceed the requirements of Table lG420103-1

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It's cool, ZF hydraulic retarder helps you to worry!

In order to alleviate the problem of truck overheating and downhill use of brakes for long periods of time with brakes overheating, resulting in brake failure, most trucks in China have been equipped with a spray tank to reduce the brake temperature, but the huge spray tank has not only incre

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The basic principle of special flotation (2)

It can be seen from the above formula that the parameters affecting the adsorption amount of the target ion in the electric double layer of the gas-liquid interface are concentration C, ion valence z and potential Ψ T . When other anti-ion ions are present in the solution, they will compete wi

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