Based on internal P-sets,the concepts of F——data and F——data outer-recovery was proposed,and the F——data outer-recovery theorem and redundancy principle of attribute surplus were given.

Research on Timing Recovery on Impulse Radio Wireless Communication System and Implementation of IR-UWB System;

A modified method for timing recovery

The algorithm was divided into three steps:(1) perform a fourth-order nonlinear transformation by differentiating and squaring the received baseband signal;(2) Calculate the second-order statistics of the transform value;(3) jointly estimate the timing recovery and carrier frequency based on the calculated statistics.

On the restoration alignment and the leveling of the expressway;

The geologic environment of Haigou gold mine,Jilin Province, and its recovery and controlling methods;

To counter the athletic injury occured now and the state of the recovery,the article provides that the means of psychological recovery after injury can help the athletes to recover quickly.

The results show: ① the injury causes both physical and psychological block in the athlete,which will directly influence the injured athlete in future training,competition and recovery;② most of the athletes are lack of the knowledge about injury prevention and the means of psychological recovery;③ some coaches attach little importance to preventing the athletes from injury.