Abstract: A method for directly planning a reentry trajectory in a height-velocity profile includes the following steps: S1, extracting an actual working parameter of an aircraft, setting the maximum value {dot over (Q)}max of a stagnation point heat flux, the maximum value qmax of dynamic pressure, and the maximum value nmax of overload according to the mission requirement, and solving the height-velocity boundary of the reentry trajectory, that is, a lower boundary of the reentry trajectory in the height-velocity profile; S2, solving a reentry trajectory of an initial descent stage according to differential equations of reentry motion, and determining a starting point of a trajectory of a gliding stage according to the trajectory of the initial descent stage; and S3, planning a trajectory in the height-velocity profile satisfying terminal constraints based on the lower boundary in the height-velocity profile, and calculating a corresponding bank angle, to obtain the reentry trajectory.

Abstract: A method for directly planning a reentry trajectory in a height-velocity profile includes the following steps: S1, extracting an actual working parameter of an aircraft, setting the maximum value {dot over (Q)}max of a stagnation point heat flux, the maximum value qmax of dynamic pressure, and the maximum value nmax of overload according to the mission requirement, and solving the height-velocity boundary of the reentry trajectory, that is, a lower boundary of the reentry trajectory in the height-velocity profile; S2, solving a reentry trajectory of an initial descent stage according to differential equations of reentry motion, and determining a starting point of a trajectory of a gliding stage according to the trajectory of the initial descent stage; and S3, planning a trajectory in the height-velocity profile satisfying terminal constraints based on the lower boundary in the height-velocity profile, and calculating a corresponding bank angle, to obtain the reentry trajectory.

Abstract: A combined inverter is arranged, which includes at least two separate box bodies connected detachably, all components of the combined inverter are placed into the box bodies separately, and at least one electrical connection terminal is arranged outside each of the box bodies, and the electrical connection terminal of one of the box bodies is capable of being connected to the electrical connection terminal of another of the box bodies. Therefore, a structure connection and an electrical connection of the combined inverter is achieved, weight of the whole combined inverter is dismantled effectively on the premise of ensuring normal operation of the combined inverter, construction difficult of installation and transportation is reduced, and the combined inverter has high applicability even when having high power.

Abstract: A combined inverter is arranged, which includes at least two separate box bodies connected detachably, all components of the combined inverter are placed into the box bodies separately, and at least one electrical connection terminal is arranged outside each of the box bodies, and the electrical connection terminal of one of the box bodies is capable of being connected to the electrical connection terminal of another of the box bodies. Therefore, a structure connection and an electrical connection of the combined inverter is achieved, weight of the whole combined inverter is dismantled effectively on the premise of ensuring normal operation of the combined inverter, construction difficult of installation and transportation is reduced, and the combined inverter has high applicability even when having high power.

Abstract: A minimal pain microneedle based transdermal drug delivery device and method. The device has a clamshell configuration, where the top part of the clamshell holds one or more chambers configured to store liquid drugs, and also configured to store one or more spring operated plungers, and at least one microneedle. The top portion of the device is attached to the bottom portion of the device by a combination hinge and a moveable shutter mechanism. In its shut position, the shutter mechanism prevents the plungers from moving, and the open shutter position releases the plunger. When the user applies the bottom of the device to the user's skin and presses on the top portion with enough force to overcome a detent mechanism, the top portion pivots against the bottom portion forcing the microneedle through an aperture and into the skin painlessly. Pressing on the shutter mechanism then results in drug self-administration.