An effective method of dynamic power management based on wavelet and AR(auto regression) is proposed to extend life of wireless sensor networks by making economical use of energy.

This paper comprehensively studies the properties of strength and toughness of U-shape steels 20MnK,Q275 on test pieces under various processes of intercritical hardening and self-tempering.

Simultaneous heating and quenching with high power medium frequency equipment for parts of long shaft,adopting special induction coil and adjustable induction coil and self tempering,will improve on medium frequency quenching quality of the parts and raise obviously productivity,thereby cause the enterprise to obtain fine product quality,high productivity and Low production cost.

The investigation was conducted on the technique of intercritical hardening by medium frequency induction and self tempering for the high strength bolts.

Hydrologic forecast model with multidimensional and hybrid regression system is combined by regression and autoregression methods.

Meanwhile, the grey forecasting models were improved and it was verified that the time response series had the properties of autoregression.

This paper introduces a recurrence formula for estimating the variances of errors of a sequence forecasted by an autoregression model and gives two examples under both smooth and nonsmooth conditions.

This paper proposes a non-linear adaptive filtering method based on analyzing the performance of the conventional adaptive methods in the cases of that the NBI can be modeled as a single tone,an autoregressive(AR) stochastic process or narrow band BPSK digital modulation signals.

An adaptive spectral-estimation model was established, and the frequency estimation was implemented by autoregressive and adaptive algorithm.

On the basisof1 Dautoregressive integrated m oving average m odelARIMA (p;d;q), the 2 D m ixed autoregressive m oving average m odel ARMA (m , n; p, q) w as developed.