The expert system of electrical upsetting process for valve based on artificial neural networks;

Selection of the parameters of electrical upsetting process for valve based on artificial neural networks;

Numerical simulation of electrical upsetting process for valve;

Starting from the valve structure relative to valve axial dimension, the structure, theory, adjusting method, operating method and characteristic for the special comparer which can be used for inspecting multiple axial parameters of engine valve in time are introduced in detail on the basis of the precondition of the unification between measuring benchmark and designing benchmark.

The finite_element software MAFAP was used to make simulation analysis on the finish_forging process of the engine valve.

On the base of unsteady-state analysis,process of engine valve for extruding is simulated and studied by FEA software.

New process for small end surface of engine air valve;

Experiment and analysis of laser fusion coating process for the cone of air valve in Model 240 engine of diesel locomotive;

Focusing on the problems existed in testing leak for engine air valves with kerosene, a device for leak testing is developed with the feature of fluid mechanics and tightness so as to increase production efficiency, reduce cost and improve working environment.

Chronometrical morphology changes of larval spiracle at different developmental stages of Parasarcophaga crassipalpis (Macquart) (Diptera:Sarcophagidae);

Ultr astructure of the spiracle of Spodoptera exigu Hubner;

According to the opening or closing spiracle, a typical discontinuous gas exchange cycle (DGC) has three distinct phases: the closed period with little or no external gas exchange, the flutter period during which oxygen enters tracheae and little CO (2) escapes and the open period during which lots of CO (2) escape.

In the case of without exhause gas, the wear process of valve-valve base pairs conforms to the general laws, it is consists of three stages, i.