Nittaku 40 + and DHS D40 + are new material seamed plastic table tennis balls, both of which are designated as official match balls and widely used. Due to the change of material and diameter of the new seamed plastic ball, its hardness and elasticity also change accordingly. The purpose of this study is to analyze the difference of the stroke effect between the two types of new material seamed plastic table tennis balls, taking Nittaku 40 + ball and DHS D40 + ball as an example. Table tennis players (N = 18) were randomly selected from the China Table Tennis College (M age = 15.16 ± 2.41; M height = 1.59 ± 0.32 m; M weight = 45.72 ± 5.17 kg). Each participant was all righthand shake-hands grip. The high-speed camera was used to measure ball speed and spin speed. Data normality was tested by using the Kolmogorov-Smirnov test. An Independent-Samples T test was conducted to assess the difference of the stroke effect between two types of new material seamed plastic table tennis balls (Nittaku 40 + and DHS D40+). Results showed that there was a significant difference between the two types of new material seamed plastic table tennis ball in the ball speed and spin speed during the backhand backspin loop stroke (p = 0.041, p = 0.022, respectively), and the ball speed and spin speed of DHS D40 + were higher than that of Nittaku 40 + ball. Compared with the DHS D40 + ball, when hitting the Nittaku 40 + ball, players need to increase the swing distance and hit the ball with more strength to improve the ball speed and rotation speed.
Sports play an important role in daily life. Every year, thousands of people watch sports events on TV or on the Internet, in which football events attract more attention. The performance of a team may have a huge impact on its fan loyalty. Therefore, the purpose of this study was to explore whether the performance of a team will affect the loyalty of fans, and how to affect the loyalty of fans. Applying web crawler to collect spectators’ comments on the performance of the Chinese Men's National Football Team in the 2022 FIFA World Cup Qualification, word frequency analysis, semantic network analysis and emotional analysis on these comments, it was concluded that the factors that affect fan loyalty from high to low were: fan attitude loyalty factor, fan identity factor, fan behavior loyalty factor, fan satisfaction factor. It was believed that this study could provide a reference for managers to improve fan loyalty.
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