Based on microlocal analysis,the propagation of singularities of semilinear thermoelastic materials with microstretch was studied by using the diagnolization of frequency analysis,and the finite propagation speed of singularities of solutions to Cauchy problem of the model was proved.

Based on the application condition and the character of the similar device, a safety accommodation ladder, which can flex, fold and lift automatically, can be electric and manual operated, is designed for medium or small sized watercraft to berth at a wharf in storm or in ebb and flow by the use of the Pro/E and ANSYS.

Firstly the introduction of collecting high-tree fruits in alien was made ,according to the actual condition and the requirement of collecting fruits in china,a new type of machine which can collecting high-tree fruits flexiblely was desighed, and the structure parameter of the machine was confirmed .

According to several shifting,long circulation time of hoisting,restricting production and affecting safety badly in the mine of nonyielding cage guide multi level hoisting,the way of ZHT cage-supported damping swing-deck with automatic changing floor cooperate with germanic flex cage guide is pointed out.

To lay the cable along the bridge successfully,the technical problems such as bridge expansion and vibration,and grounding should be solved.

The advantages of rigid UPVC pipe are introduced and according to expansion, fixing, noise and other practical questions corresponding preventive and control measures are proposed.

The paper introduced the maintenance procedure of bridge expansion joints and discussed its importance.

Research and application of micro-feeding unit based on electrostrictive actuator;

Finally, we use the electrostrictive actuator in a procise micro -feeding unit to realize a procise microfeed.