Abstract.Through field geological survey and drilling exploration in Sanjiang Basin, combined with geochemical analysis, the tectonic thermal evolution history of intrusive rocks is studied. The results show that the Early Mesozoic siliceous rocks in Qianjin Depression of Sanjiang Basin are widely distributed. The siliceous rocks are of post diagenetic hydrothermal metasomatic origin, and the hydrocarbon source rock indicators are good, which is expected to be a new formation for oil and gas exploration in Sanjiang area. The time temperature thermal history simulation of fission track shows that there … Read more →

Abstract.As a widespread species in the Southern Ocean, pseudobrachial Sakurapill has relatively high abundance and relatively uniform distribution. The acoustic data for this study were obtained from the scientific fish finder (SIMRAD EK60) aboard the Xuelong polar research vessel, which operates at 120kHz. Biological sampling was obtained from vertical trawl sampling of zooplankton from 200m to the surface, and acoustic data processing was performed in the specialized software of the Institute for Underwater Acoustic Survey and Analysis of Biological Resources (ECHOVIEW 6.1.72, MYRIAX, AUSTRILIA). … Read more →

Abstract.With the rapid development of China's bridge cause, more and more Bridges are being built across the country, and the protection of bridge piers has become more and more important. Based on the local erosion mechanism of bridge pier, this paper summarizes and analyzes the influencing factors of local erosion and the evolution process of erosion pit, and puts forward a series of protective measures. Finally, we put forward suggestions on the future development direction for the shortcomings of the existing research. Read more →

Abstract.Based on the relevant research of domestic and foreign scholars, this paper analyzes the transmission mechanism of the impact of financial mismatch on total factor productivity of enterprises through the intermediary variable of enterprise innovation, and deeply explores the relationship between financial mismatch and total factor productivity of enterprises. It is expected to put forward suggestions for enterprises to improve total factor productivity and China's factor marketization reform, provide a new direction for the next step of state-owned enterprise reform, and provide a basis for … Read more →

Abstract.In the excavation engineering, the bracing stiffness is an important parameter reflecting the supporting performance of the inner bracing system. Bracing stiffness has great influence on the deformation of the retaining structure and the foundation pit, and its calculation method is the theoretical basis for the design and deformation analysis of the foundation pit. The limit equilibrium method, subgrade reaction method and finite element method used in the design, stability and deformation analysis are introduced in detail. Different calculation models and calculation methods of bracing … Read more →

Abstract.Based on the improved model of Kaya identity and LMDI decomposition method, this paper conducts decomposition analysis on the influencing factors of carbon emissions in Anhui Province from 2008 to 2020. Based on the results of LMDI decomposition method, this paper uses STIRPAT model to conduct regression analysis to study the internal driving factors of carbon emissions in Anhui Province, and provides targeted carbon emission reduction suggestions. The results show that economic development contributes the most to the positive pull of carbon emissions, and energy intensity contributes the most … Read more →

Abstract.The geological conditions of coal mining in my country are complex, and the difficulty of coal mining is becoming more and more difficult. Among them, the problem of coal mine structure also appears frequently. The existence of structures will not only greatly increase the cost of coal mining, but also pose a great threat to the safe production of coal mines. Conventional exploration methods cannot accurately predict structural development areas. At present, trough wave seismic exploration technology has become a mine geophysical method to detect coal seam structure. Because trough wave … Read more →

Abstract.At present, owing to the different size between the SAE manikins used in seat comfort evaluation and the Chinese anthropometry, and the poor representation and coverage percentile manikin had to actual manikin, it is necessary to establish a new seat comfort manikin model based on the Chinese anthropometry characteristics. In this paper, the principal component analysis was used to reduce the multidimensional data set of the Chinese anthropometry by using eigenvectors and eigenvalues. The goal was to establish a three-dimensional confidence ellipse with 95% confidence, and then select the … Read more →