Objective The aim of this study is to establish a quantitative method for diagnosing the ankle instability in acute injury of lateral ligaments through measuring the normal value of the talar tilt angle of ankle joints.

Objective This article is to clarify the relationship between talar tilt angle and the chronic instability of the lateral ankle , so as to offer a method of quantitative diagnosis about the chronic instability of the lateral ankle.

The relationship between stepping angle to the optimal starting frequency,between rotating inertia to the optimal starting frequency,between starting tor.

The drive power supply holded the primary characterstics for the motor and it raised four times for stepping angle accuracy in the motor.

The test shows that this system can subdivide further the stepping angle of stepping motor to satisfy the application needs of high precision and high resolution capability.

When the wind speed is above the rated value,pitch angle is regulated to maintain the constant power output and the constant rotor speed.

In the case of the consideration of angle of attack,propeller pitch angle,yawing rotation,gravity and moment of inertia,a mathematical model based on static analysis is put forward,which is used to study loads of the blade bearing system of a wind turbine.

This algorithm directly uses star angular distance as matching feature.

And then star angular distances are directly stored according to their length in- creasing.