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City image, as a public image, is the public's overall evaluation and cognition of the city, including concept image, behavior image, and visual image. The new media art is an interdisciplinary research field integrating art, informatics, and communication. It emerged and developed in the new media era and effectively reached the agreement of scientific and technological means and artistic expression. This paper expounds the concept and connotation of smart city informatization and then constructs a measurement model of smart city informatization construction level based on GCD_BPNN. The degree of satisfaction of city image communication in H city was measured, the index evaluation system of system satisfaction in H city was constructed, and the comprehensive satisfaction scale of cultural system in H city was formed. The research shows that the communication of city image in the future should focus on the virtual space and construct the cultural identity and psychological identity of city image from the user's point of view. [ABSTRACT FROM AUTHOR]

The identification of generating units that abuse market power is an essential part of risk prevention in a spot market, especially in the early stage of the construction of the spot market. In this study, a model for identifying generating units that abuse market power is designed based on the AdaBoost-DT algorithm. It is targeted at the imbalance between samples of generating units that abuse market power and normal generating units in the spot market. First, the four main methods by which market power is abused by generating units in the spot market are described: collusion, economic withholding, physical withholding, and extreme quotation. Second, the specific characteristics of the four methods are analyzed, and the identification indexes for generating units that abuse market power are established. Thereafter, a sample set of generating units that abuse market power using different methods is constructed. Furthermore, a training set is formed with samples of normal generating units to construct a model based on the AdaBoost-DT algorithm, for identifying generating units that abuse market power. Finally, the spot market data of a certain region are used for an example analysis. The results show that the accuracy of model identification is 97%, which validates the method. [ABSTRACT FROM AUTHOR]

The dynamic process of circular water jets plunging into a quiescent pool was analyzed in this study based on the RNG k∼ε turbulence model and VOF method. The effects of jet velocity and inclination angles relative to horizontal on the cavity shapes and sizes were analyzed. The simulation successfully captured the formation, development, pinch-off, and disintegration phenomena of cavities. The shape of the cavity is mainly affected by the impact angle, while the impact velocity mainly affects the size of the cavity. The cavity pinch-off initially appears at a certain point in any direction for vertical jets, while the cavity in the opposite direction of flow pinch-off appears before the cavity in the direction of flow for inclined jets. Before cavity pinch-off, the maximum radial and axial sizes of the cavity generally increase with the impact velocity and the time after impingement. The axial penetration velocity of the cavity tip is approximately half of the impact velocity, which is consistent with previous research. Finally, based on the statistics of the cavity sizes, empirical formulas for predicting the maximum radial and axial sizes of the cavity were established. [ABSTRACT FROM AUTHOR]