As a rule of sentence-making in classical Chinese verse, antithesis has its philosophical basis,which is manifest in the principle of thorough connection and exquisite combination of "yin", "yang",positive and negative sides.

As the run-of-mine ore has a high MgO content and the minerals therein are finely disseminated,direct-reverse flotation process was employed,while new types of collectors called MG and SR were introduced for direct and reverse flotation,respectively.

According to property of Yichang phosphorus ore,A positive-negative flotation process or a reverse flotation process was used for mid-low grade of phosphorus ore of Yichang mine.

Islanding detection method of positive feedback according to inverter;

Global robot path planning based on positive feedback GA;

The technical,ecnomical,and environmental analyses of the test results showed that direct-reverse flotation circuit was adapted to Yichang phosphate rock.

The simulation result show that the impeller refining effect with two direction whirl fashion is better than impeller refining effect with unilateralism whirl fashion.

Research on pseudo-positive feedback phenomenon of GM-AGC system;

The problems occurred in the course of setting and testing the progressive die with forward and backward drawing processes are introduced.