Based on the refraction-diffraction theory of irregular waves in the waters of slowly-varying currents and depths, and the generation dissipation theory of wind wave, a model for nonlinear irregular waves in coastal a...Based on the refraction-diffraction theory of irregular waves in the waters of slowly-varying currents and depths, and the generation dissipation theory of wind wave, a model for nonlinear irregular waves in coastal area is developed. In light of the specific conditions of coastal wave character and engineering application, a practical mathematical model for the nonlinear irregular waves is presented, with directional spectrum in coastal area. Coast effect, refraction, whitecapping, bottom friction, current, wind and nonlinear action are considered in this model. The numerical methods and schemes for wave refraction ray, energy conservation of propagation, energy balance of the generation and dissipation of wind waves have been studied. Finally, the model is used for the directional wave spectrum computation in the Daya Bay. Compared with the measured data with 956 wave bouys in the Daya Bay, the model results are in good agreement with the measured results.展开更多
Almost all intraplate caprocks experienced strong deformation during the convergence of microplates, and then disintegrated into many secondary geologic units with the special characters, such as irregular boundaries ...Almost all intraplate caprocks experienced strong deformation during the convergence of microplates, and then disintegrated into many secondary geologic units with the special characters, such as irregular boundaries and particular structural assemblages. In order to understand the formation mechanism of these special phenomena, a rheological experiment on the structural scenery of the Tongling area is carried out. The result shows that the primary regular and uniform boundaries of the Tongling area becomes irregular because of the enclosing and confinement of surrounding geological units in the process of 'compression-shearing-rotation-drag'; simultaneously, two specific 'drag depressions' developed at two opposite corners of the block. The former and the later phenomena can be regarded as a typical regional-scale rheological effect and necessary outcome of intraplate deformation respectively.展开更多
城市无人机渗透作战中使用智能无人机执行隐蔽穿插、渗入和目标定位等任务,但其面临着城市环境复杂、空域限制等挑战。为了解决城市渗透背景下无人机的路径规划难题,提出了一种ATD-DBO(Adaptive T Distribution-Dung Beetle Optimizer)...城市无人机渗透作战中使用智能无人机执行隐蔽穿插、渗入和目标定位等任务,但其面临着城市环境复杂、空域限制等挑战。为了解决城市渗透背景下无人机的路径规划难题,提出了一种ATD-DBO(Adaptive T Distribution-Dung Beetle Optimizer)驱动的无人机在不规则区域的渗透路径规划算法。首先,提出融合城市建筑物分布、岗哨位置以及无人机特性的无人机城市渗透模型。其次,提出了虫口混沌映射初始化种群、自适应t分布和动态变异策略扰动蜣螂位置和将非精英个体进行二次变异的ATD-DBO算法。最后,提出了一种融合城市实战不规则区域场景和打击意图的快速突进模型。实验证明,算法规划出的路径在有效避开岗哨位置的同时能够确保路径较短。展开更多
基金Chinese Academy of Sciences:the"Ninth Five-Year Plan"important resourcesenvironment research project"pipeline in seabed"(No.KZ951-A1-405)alse by the Chinese"Ninth Five-Year Plan"strategic research project"examinacion in Nansha Islands"(N
文摘Based on the refraction-diffraction theory of irregular waves in the waters of slowly-varying currents and depths, and the generation dissipation theory of wind wave, a model for nonlinear irregular waves in coastal area is developed. In light of the specific conditions of coastal wave character and engineering application, a practical mathematical model for the nonlinear irregular waves is presented, with directional spectrum in coastal area. Coast effect, refraction, whitecapping, bottom friction, current, wind and nonlinear action are considered in this model. The numerical methods and schemes for wave refraction ray, energy conservation of propagation, energy balance of the generation and dissipation of wind waves have been studied. Finally, the model is used for the directional wave spectrum computation in the Daya Bay. Compared with the measured data with 956 wave bouys in the Daya Bay, the model results are in good agreement with the measured results.
文摘Almost all intraplate caprocks experienced strong deformation during the convergence of microplates, and then disintegrated into many secondary geologic units with the special characters, such as irregular boundaries and particular structural assemblages. In order to understand the formation mechanism of these special phenomena, a rheological experiment on the structural scenery of the Tongling area is carried out. The result shows that the primary regular and uniform boundaries of the Tongling area becomes irregular because of the enclosing and confinement of surrounding geological units in the process of 'compression-shearing-rotation-drag'; simultaneously, two specific 'drag depressions' developed at two opposite corners of the block. The former and the later phenomena can be regarded as a typical regional-scale rheological effect and necessary outcome of intraplate deformation respectively.
文摘城市无人机渗透作战中使用智能无人机执行隐蔽穿插、渗入和目标定位等任务,但其面临着城市环境复杂、空域限制等挑战。为了解决城市渗透背景下无人机的路径规划难题,提出了一种ATD-DBO(Adaptive T Distribution-Dung Beetle Optimizer)驱动的无人机在不规则区域的渗透路径规划算法。首先,提出融合城市建筑物分布、岗哨位置以及无人机特性的无人机城市渗透模型。其次,提出了虫口混沌映射初始化种群、自适应t分布和动态变异策略扰动蜣螂位置和将非精英个体进行二次变异的ATD-DBO算法。最后,提出了一种融合城市实战不规则区域场景和打击意图的快速突进模型。实验证明,算法规划出的路径在有效避开岗哨位置的同时能够确保路径较短。
