Research on coupling coordination and influencing factors between Urban low-carbon economy efficiency and digital finance-Evidence from 100 cities in China's Yangtze River economic belt.

CCD is a method to analyze the correlation relationship between multiple systems, which can effectively reflect whether the relationship between multiple systems is harmonious and well-matched, with an overall trend of coordinated development [ 43 ].

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The influence of the scientific research level showed a decreasing trend, with an average annual decrease of 1.70% and q-values fluctuating between 0.3715–0.5989, and the q-value of this factor was still relatively high compared to other factors.

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The rotation angle and the length of the long semi-axis remained basically unchanged from 2014 to 2016, while the length of the short semi-axis changed from a shortening trend in the previous period to an increasing trend, and the perimeter and area of the ellipse showed an increasing trend, indicating that the dispersion in the spatial distribution of the CCD increased and was mainly manifested in the direction of the short axis of the SDE.

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