In view of the difficulties of route declaration and no fly zone (abbreviated as NFZ) identification in the use of unmanned aerial vehicle(abbreviated as UAV) in transmission line patrol inspection in the power industry, this paper studied the unified management, monitoring and scheduling method of UAVs in transmission line patrol inspection by using GIS and global satellite navigation system technology, designed the UAV patrol flight monitoring system in transmission line, and analyzed the functions of each module of the system, the early warning algorithm of UAV's NFZ was designed to realize efficient, safe and orderly inspection of UAV on transmission line.
Regarding the three expansion modes of hydraulic fractures at the interface of a coal measure composite reservoir (arrested, deflection, and penetration), based on the coupling theory of fluid flow and solid elastic deformation, a criterion that considers the influences of the injection parameters (fracturing fluid injection rate and viscosity) is established to predict the propagation path of hydraulic fractures at the interface of a composite reservoir. The criterion judges the propagation behavior of the fractures by comparing the water pressure in the wellbore and the critical seam pressure of the penetration and deflection. The controlled variable method is used to analyze the influences of the various factors on the propagation behavior of hydraulic fractures at the interface between layers. The results show that the differences in in situ stress, the interface cohesion, and the included angle mainly affect the critical seam pressure of the fracture deflection. The differences in elastic modulus, fluid injection rate, and fracturing fluid viscosity directly affect the water pressure in the wellbore. The difference in the fracture toughness mainly affects the crack propagation path by affecting the critical seam pressure of the deflection. The smaller the difference in the in situ stress is, the more likely it is that the hydraulic fractures will penetrate the layer. Larger differences in the fracture toughness between layers, interfacial cohesion, fluid injection rate, and fracturing fluid viscosity are more conducive to the hydraulic fractures penetrating the layer. When the angle between the hydraulic fractures and the interface is 25–55°, the hydraulic fracture is more likely to expand along the interface. This criterion takes into account the influences of the injection parameters and is of great significance to gaining a better understanding of the propagation behavior of hydraulic fractures at an interlayer interface.
On page 4222, C.-M. Chen and co-workers describe how, when graphene meets carbon fibers, the combined thermal conductivity and mechanical stiffness provide this full carbon architecture with a greater potential over copper foil for heat dissipation applications.
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