This paper provides an analysis of the current state of digital finance in China and the import and export trade situation in 31 provinces. Through an examination of relevant literature, the article identifies the different stages of development that digital finance has undergone in China. To further explore the relationship between digital finance and import or export trade, a PVAR model was constructed. In this model, the Digital Inclusive Finance Index (2011-2020) calculated by the Peking University Digital Finance Center research group was used as the core explanatory variable, while the import and export trade volume of 31 provinces and cities (excluding Hong Kong, Macao, and Taiwan) were selected as the explained variable. Our findings suggest that: (1) the current state of foreign trade is relatively mature and in a period of high-quality development and transformation, and digital inclusive finance is in the high growth period. (2) the development of digital finance has little impact on the development of foreign trade, while the development of foreign trade will make significant effects of digital inclusive finance. Based on these conclusions, we provide policy recommendations to achieve common prosperity through the use of digital finance and foreign trade.
In the process of multiple injections, the influence of different injections makes the controlling of cycle fuel injection quantity more difficult. The high pressure common rail (HPCR) simulation model is established in AMESim environment. Through the method of combining numerical simulation and experiment test, it is found that the strong coupling of pressure fluctuation and needle valve response is the fundamental reason, which leads to the fluctuation of main injection fuel quantity (MIFQ) with dwell time (DT). The result shows that the largest fluctuation quantity is 3.6mm3 when the reference value of main injection is 60.0mm3. Non-damping LC hydraulic system model is also established. Through the analysis of the model, reducing the length-diameter ratio of internal oil duct and the delivery chamber volume are decoupling methods to the strong coupling.
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