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The underwater recovery problem between an autonomous underwater vehicle (AUV) and a static open-shelf docking station was addressed in this paper. In order to implement this type of recovery method, a positioning-to-line (PTL) strategy was proposed. Based on this strategy, three subsystems were designed to guarantee the position and attitude of the vehicle change to expected ones. In addition, acoustic...
Due to the characteristic of collaborative beamforming, more than one node will be used to form the beampatten. Although the more nodes are selected the better beampattern can be formed, it also means more energy will be consumed. Considering the scarcity of energy in wireless ad-hoc network, the number of collaborative nodes must be controlled. It is necessary to select some of them to form the pattern...
Sharpness of field emitter tips is one of the key factors to achieve excellent field emission performance. In order to sharpen the tips to atomic scale, a new method combining the bottom-up process of wafer-scale nanopattern formation via self-assembly of diblock copolymer with the top-down process of anisotropic etching of Si followed by nanocasting is developed. Geometrical hindrance in the oxidation...
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