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Autonomous Underwater Vehicle (AUV) is a nonlinear, strong coupling, big hysteresis of a multi-input multi-output system, and the aircraft also affected uncertainty by waves, wind, ocean currents and so on. Unmanned underwater vehicles Control require a very high demand. In this paper, for an unmanned underwater vehicle witch shape is approximate to a torpedo, based on the dynamic analysis of the...
The system of unmanned surface vehicle has the problems of large inertia, long time-lag. nonlinearity and the difficulty of building accurate models. Furthermore it can easily be interfered by external factors, such as wind, wave and airflow. The traditional way of controlling, PH), which is applied by this system, can hardly work well to control the course of a vehicle. In order to control the vehicle...
X-ray in-line phase contrast computed tomography (PC-CT) can provide imaging contrast that is orders of magnitude better than conventional absorption-based CT and has attracted some interest in many fields such as life science, medicine and biomedical engineering. In conventional methods, PC-CT needs two rotation scans to retrieve the phase line integral projection from the recorded original data...
In RFID systems, some readers will suffer from RF interference, which can lead to reader collision. Consequently, an anti-collision algorithm based on distributed power control (DPC) scheme was proposed as a solution for the problem in this paper. The proposed algorithm dynamically adjusts power output of a RFID reader based on the signal-to-interference ratio (SIR) of RFID reader receiver, minimizes...
The adoption of pseudo-noise (PN) sequence instead of cyclic prefix (CP) as guard interval (GI) enables time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) outperform Cyclic Prefixed- OFDM (CP-OFDM) by spectrum efficiency but at the expense of higher complexity. Up to now, TDS-OFDM is only used in unidirectional data transmission such as downlink broadcasting. The difficulty...
The mode conversions of micro/nanofiber (MNF) tapers are numerically simulated by using 3-Dimension Finite-Difference Beam Propagation Method(FD-BPM). We consider the behaviors of adiabatic MNF tapers and discussed that the non-adiabatic MNF taper behaves more complex multimode interference and beat effects in the transition and waist sections.
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