Combined with the producing practice,this paper introduces its working principle and process of the spot welding of wiper fixed bracket and the factors influencing the welding quality.

The bending technology of fixed bracket for the tube of excavator was analyzed.

Importance of fixed support in heat pipe net;

The result shows that the scheme using ball joint compensators is feasible, which reduces the quantity of fixed supports and is easier to construct.

In the design of the compensators and supports of the piping line, th e amount and the recuperability of the fixed supports should be reduced as much as possible, and the distance between any two fixed supports should be enlarged as much as possible according to the features of the piping line, from which the economic benefit of the piping line can be fully embodied.

When engineering bacteria that can effectively degrade phenol are immobilized on activated carbon,immobilized biological activated carbon(IBAC) comes into being.

The pollutant removal efficiency of the integrative immobilized biological activated carbon(IBAC)bioreactor in oil refinery wastewater treatment has been studied.

In order to insure biological safety of immobilized biological activated carbon(IBAC),underling sand under IBAC is adopted.