Fatigue of MEMS structures may occur after cyclic vibration loading, which can lead to the material degradation. A test bench was built for mechanical fatigue testing, especially for the structures that actuated by electrostatic force. A RF MEMS switch which was made of gold was tested; the material mechanical characteristic was monitored during the tests by means of the value of pull-in voltage, which is related to the change of the Youngs modulus. The fatigue stress was produced by an alternating voltage, and the amplitude of which is from 15V to 65V. The excitation frequency and the actuation time were used as a counter for the number of cycles. The results show that there is no detectable mechanical fatigue after actuation up to one billion cycles.

Based on a one-dimensional model of dielectric charging for capacitive RF MEMS switches, the accumulated charge density and actuation voltage shift were simulated. The results illustrate that rougher surface can reduce dielectric charging, so the dielectric layer should be fabricated much rougher during deposition process. But the capacitance ratio of switch will be decreased with rougher surface, which can cause a reduction of switch performance. Thus the dielectric surface roughness should be balanced in reliability and isolation.

There are kinds of animal diseases and a smaller number of experts in the corresponding field of disease diagnosis expert. So animal husbandry units are unable to make a rapid and accurate diagnosis for animal diseases generally. To solve this problem, the paper is proposed a model of animal disease diagnosis expert system based on HSMC-SVM. In theory, it confirms that HSMC-SVM is feasible in applying of animal diseases diagnosis expert system. Numerical experiments verify HSMC-SVM has higher accuracy and better generalization ability in the diagnosis of animal diseases.

In this work, various phases of nanorod TiO2 were fabricated by hydrothermal process. Different crystalline phases of TiO2 nanowires will be analyzed by electrochemical analysis (CV, LSV, C-rate, charge and discharge, and EIS test) to investigate the influence of Li+ diffusion rate on specific capacitance. The in-situ XRD structure for charging and discharging will be carried out to explore the diffusion and structural behavior of Li+ in TiO2 was explored its fast charging, high capacitance and high safety characteristics, which will be a fundamental research of Sn modified on TiO2 nanowire. Transmission electron microscope image showed a range of 20 to 80 nm length TiO2 nanorods was success synthesized, and the XRD indicated the phase were rutile, anatase and rutile/anatase mixed by controlling the chelating agents (citric acid). The specific capacity of TiO2 nanorod was 120 mAh/g which the Columbic efficiency was ~ 99% under 0.1 C. A morphology of Sn@TiO2 was investigated as nano-capsule. The results are supposed to clarify the key factors of the fast charge, high specific capacitance and safety. It is expected that the Li+ ion influence on structure changes during the charge and discharge process by implementing this research. The fast charging, high specific capacity and high safety mechanism will be established as an index for material application and commercial products. Keywords: TiO2 anode materials, Sn@TiO2 anode materials, Li-ion battery, In-operando XRD

Two different dynamic models have been presented to investigate the transient mechanical response of a RF MEMS switch under the effects of squeeze-film damping based on a modified Reynolds equation. Both the perforated and non-perforated structures are built for comparison. The models include realistic dimensions. The surface pressure, the damping force, and the tip displacement are simulated in three different ambient pressures, such as 500Pa, 5kPa, and 0.05MPa. The result shows that the increased damping leads to a substantial decrease in oscillation with increasing pressure for the non-perforated structure. Compared with the perforated pad, there is a much larger damping force acts on the non-perforated surface, and an obvious decrease in damping force with increasing pressure.