Effects of ultrasonic parameters (ultrasonic time, temperature and ultrasonic power) under different ultrasonic frequencies including 20, 60, 100 kHz on total phenolic contents (TPC) of extracts from citrus peel (CP) were analyzed. The results showed that TPC of extracts from CP increased significantly with increases of ultrasonic time, temperature and ultrasonic power under three ultrasonic frequencies.

The theoretic formula for the optimal radius of elastic-plastic junction in auto-frettage thick-wall columnar pressure vessel was deduced. on the basis of the twin shear strength theory, the relationship between the allowable maximal operating pressure for the pressure vessel and yield was analyzed,Bauschinger effect to reverse yield with auto-engaged vessel was investigated, The procedure was illustrated with the help of numerical example and the results show the reliability of the designing method.

In order to improve the steering and braking of the bulldozers, electro-hydraulic proportional control technology is adopted without change the transmission system of bulldozer, two hydraulic rams are used to control the steering and braking valves in both sides of bulldozer, one electromagnetic direction valve to select controlling side, and proportional reduced valve to control the pressure of hydraulic ram. Then Matlab/Simulink to imitate the dynamic characteristic is used, The single stick steering and braking control system designed improve the maneuverability and operating condition of bulldozer. The result of this paper can apply to practice directly and use for reference for other engineering machine as to single stick centralized control.

with computer graphics technology continually improved, visual simulation system development of sports simulators has become the hotspot. The structure and work principle of 6-DOF tank virtual driving simulator are presented, motion simulation of driven equipment are done by developed based on advanced simulation software(MultiGen Creator and OpenGVS SDK), which is combined with the Object-Oriented method. Dynamics model of simulate system is established , object model is disposed and collision detection is briefly analyzed. The immersion of this visual simulation has been confirmed experimentally.

In order to optimize octagonal ring elastomer, the structure and work principle of thin extended octagonal ring elastomer is briefly presented, the corresponding model is established by material mechanics, the analysis of stress and strain is discussed by finite element and the critical parameters is found. It is practical for octagonal ring elastomer improving the performance .