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Taking a general view of the paper, major innovative ideas and returns are as follows: The main innovative ideas are as follows: 1. The paper put forward the new idea that combine water-saving drilling with rotary percussion drilling creatively according to the present situation of water resource lack seriously and the background of implementation of state geological survey strategy. 2. The working principle of new designed system of water-saving hydraulic percussion device completely different from traditional hydraulic percussion device, the system can carry out rotary percussion drilling on the condition that no surface water be consumed, and achieve the purposes that saving surface water, cutting cost and improving drilling efficiency. 3. The design conception of steel ball percussion device is very novel, the percussion device is durable, with a simple structure, at the same time drilling efficiency would be improved highly and drilling cost would be reduced greatly when drill with the steel ball percussion device.

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Super RENS technology has been applied in super high density optical data storage, near field photolithography, nanome...

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The thesis mainly researches on the single phase AC/AC converter in the topologies including AC_Buck and AC_Cuk. Firstly, the operating principles of the two converters are analyzed in detail and the rules of their parameters design are educed; The commutation of their power switches which is the key of these topologies to realize is analyzed in detail and a feasible solution which can be named RCD-Commutation mode is presented and proved effectual by theory analyses and simulation results.

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How it works: decompression works is the use of diaphragm, spring and piston and other sensitive components, to change the valve core and valve seat of the gap to achieve the automatic decompression purposes.

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The gun body of vacuum plasma welding chamber for titanium and titanium alloy imported from Germany has been reformed based on the principle of compression effection of plasma arc and stability of electric arc.

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Through research on principle and approach, this paper puts forward three new methods in power cable fault location.

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This paper introduces the principle and classification of mechanical balance,the allowable amount of unbalance and balance precision in the process of mechanical manufacturing,the balance testing method and its principle,the dynamic balancing system,and digital signal processing technology for rotating parts.

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Then using the light cone formula, we calculated the x distribution of all partons and flavor asymmetry 〓-〓 which is consistent with the measurement of experiment.

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