Search

This paper addresses event-triggered fault tolerant controller design for a class of T-S fuzzy systems. New two channel event-triggered communication schemes is introduced to reduce network resource utilization. The key idea is that only the newly sampled-data is transmitted only when it violates specified triggering condition. A logic zero order holder is used to choose the latest transmitted data packet and discard the disordering packet. Considering the effect of the network transmission delay and probabilistic actuator fault with different failure rates, based on the T-S fuzzy model, a new event-triggered networked T-S fuzzy systems is constructed. Based on the newly built model, a stability criterion and a stabilization criterion for the networked T-S fuzzy systems are derived, respectively. Moreover, a co-design algorithm for simultaneously determining the gain matrices of the fuzzy controller and the triggering parameters is developed. Finally, a numerical example is given to demonstrate the effectiveness of the proposed method.

Microwave generation from a resonant cavity surrounding oscillating virtual cathode, which is produced by non-homogeneous electron beams, is studied experimentally. The microwave power is measured by using the crystal detector and frequencies are measured by using the heterodyne technique. A single microwave pulse contains two microwave signals with different frequencies, one peak power is 1.12 MW at 5.03 GHz and the other is 0.56 MW at 5.24 GHz, and their 3 dB bandwidths are 18 and 25 MHz, respectively.

Ag-ZnO-Ag X-ray detectors based on ZnO film and nanowires are both fabricated in this paper. Results of continuous X-ray radiation measurement show that the two detectors have high responsivity: the responsivity of the ZnO film device is about 0.12 μC/Gy under a 100 V bias voltage, and that of the ZnO nanowires device is about 0.15 μC/Gy under a 50 V bias voltage. Surface effect due to the absorption and desorption of oxygen on the ZnO surface, which makes the carrier lifetime increase, is decisive to the high responsivity. ZnO film and nanowires have their potential applications in the X-ray dose rate measurement.

This paper deals with the synchronization of complex networks with random nodes. Sufficient conditions for the synchronization of complex networks are derived by using the Lyapunov functional method and linear matrix inequality technique, and the obtained criteria depend on not only the size of the delay, but also the probability distribution of random nodes. A simulation example is exploited in order to illustrate the effectiveness of the proposed method.