ZnO microwire (MW) homojunction light emitting diode (LED) arrays were grown on a Si substrate by an electric field assisted chemical vapor deposition method. The sequential growth of the Sb-doped p-type ZnO MW along the undoped n-type ZnO MW is controlled by the application of the external longitudinal electric voltage. Low-temperature microscopic photoluminescence spectra from the Sb-doped ZnO MW segment exhibit strong emissions of neutral-acceptor-bound exciton (A 0 X) emission, free electron to the acceptor (FA) and donor-acceptor pair (DAP). The acceptor binding energy is estimated to be B125 meV at 10 K. The I-V characteristic of a single ZnO microwire LED showed a good rectifying behaviour with a turn-on voltage of about 3.5 V. Blue white electroluminescence (EL) is visually observed at room temperature, the intensity of which increased with increasing the injected current.The electric field assisted CVD method to grow ZnO MW homojunction LED arrays opens up a new possibility for fabricating the ZnO based p-n junction devices.
With the development of marine-related industries, the number of tasks at sea has increased, and accidents there happen more frequently as well. Search and rescue are very challenging because of the extreme wind and wave environment at sea. Therefore, the state has been paying more attention to maritime emergency rescue. One part is emergency rescue path planning, which is crucial for helicopter emergency rescue at sea. In this paper, a series of multi-target rescue path solutions are created in order to solve the challenge of multi-target rescue path planning while taking into account sea wind and waves. The rescued targets’ floating trajectory model is first established. Then, a recursive algorithm based on a permutation tree is given in response to the unsteady change of the targets’ position at sea. The rescue path is planned with the goal of cutting down on the helicopter’s search time. Finally, using the multi-target rescue in China’s Taiwan Strait as an example, it is discovered that the overall time needed for the multi-target rescue is decreased by 7.03 minutes, and the efficiency of the rescue is improved by 13.3% in the wind and wave environment at sea. According to the research, the optimal rescue path shortens the time required for multi-target rescue at sea while increasing the effectiveness of helicopter rescue operations.
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