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In this paper, the basic theories of the Self-excited Oscillation Pulsed Jet Nozzle (SEOPJN) invented by the authors are introduced. Then, some experimental results are shown. According to the results, using tricorn bits assembled the SEOPJN to drill oil well, the rate of penetration (ROP) increases by 8% - 77%, and the rate of the footage for tricorn bit increases by 6.7% - 44%. Although the test was conducted in the water, good result was got in nature gas transportation. The volume of gas transportation could be increased by the Self-excited Oscillation Pulsed generator while the gas pressure drop could be decreased, since it significantly reduced the pressure loss during gas transportation.
A forecast method of the impact factor
trend was given based on grey system theory. Using this method, combined with the
top 20 management science journals, the grey system GM (1, 1) model was
constructed. The model evaluates and predicts the average impact factor trend
of the top 20 management science journals.
A regression mathematical model of China
electronic commerce transaction scale was given based on information reused
analysis method. This regression mathematical model could evaluate and predict
change tendency of the China electronic commerce transaction volume and could
provide reference for electronic commerce transaction researchers.
Application (APP) is not only the product of the information age but a good
helper of modern medical. In this paper, the status of mobile medical APP is
described in terms of the implementation of mobile medical App, the
classification of mobile medical App, mobile medical App quality and content, problems
of mobile medical App.