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Your search keyword '"Zhang, Zhongqiu"' showing total 5 results
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5 results on '"Zhang, Zhongqiu"'

4. 3-D Impact Time and Angle Control Guidance Law Based on Sliding Mode without Speed Control.

Author

Zhang, Zhongqiu, You, Jun, and Han, Zhiguo

Subjects
*ANGLES, *CARTESIAN coordinates, *AZIMUTH, *PROJECTILES, *SPEED
Abstract

In modern warship, coordinated combat strategies require missiles hit targets simultaneously, sometimes even require angle constraints, which is difficult to replicate in three-dimensional (3-D) models. This paper proposes a novel 3-D sliding mode guidance law with multiple constraints. First, the 3-D no-thrust guidance model is derived in the coordinate system with Y -axis upward. Second, a novel guidance strategy is proposed. In pitch direction, a fast nonsingular sliding mode surface algorithm is proposed to satisfy the desired line-of-sight elevation angle. In yaw direction, based on the guidance conditions, a special sliding mode surface is proposed, which can achieve desired line-of-sight azimuth angle and desired impact time when reaching the sliding surface. Finally, simulations and comparisons verify the good performance. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Effectiveness of Mindfulness on Athletes Flow: the Mediating Role of Resilience.

Author

LIU Fengbo, ZHANG Zhongqiu, and LIU Shuqiang

Abstract

Objective: To explore the correlation and causality between mindfulness and flow of athletes through two studies, as well as the role of resilience. Methods; In study 1, 269 athletes were recruited and measured with questionnaires. The 2 (experimental conditions) x 2 (time) randomized controlled trial was used in study 2. 66 athletes were recruited and randomly assigned into the mindfulness training group (N = 33) and the control group (N = 33). The mediating effect of resilience was tested using the method of Bootstrap. Results; In study 1, mindfulness, resilience and flow were positively correlated with each other; Resilience mediated the relationship of mindfulness and flow. In study 2, there was no significant difference in the total scores of the pre - tested indicators between mindfulness training group and control group. Compared with the control group, the subjects in the intervention group showed increased mindfulness level, resilience and flow; Resilience change significantly mediated the relationship of group and flow. Conclusion; Mindfulness can significantly predict athletes flow; resilience mediates the relationship between mindfulness and flow. [ABSTRACT FROM AUTHOR]

Published
2024
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