Compared the programming method of theobject-oriented and process-oriented, the basic concepts and principal properties of the object-oriented method was introduced, the software programming method of the fan selection system was analysed and an example of class is listed.

Compared the programming method of the object-oriented and process-oriented,on the introduction of the basic concepts and principal properties of the object-oriented method are emphasized,and based on these concepts,the software programming method of the fan selection system is analyzed.

Aimed at the new J-shape ventilation system of fully mechanized sub-level caving face,the model of computational fluid dynamics was set up for simulating the flow field of the goaf under J-shape ventilation system.

5201 fully mechanized sub-level caving face in Wangzhuang Coal Mine of Lu'an Mining Group, and based on the successfully retaining of small section entry along gob side, the method of J-shape ventilation system and its regulating technology were put forward for controlling high gas emission at fully mechanized sub-level caving face.

With the development of society, people's concern over indoor thermal environment and indoor air quality (IAQ) has led to the emergence of mini-type ventilation system, which brings healthy and comfortable environment to freestanding residential buildings and small offices.