In this paper, we characterized and compared signal transmission performances of traces with different specifications of fiber weave. Measurements demonstrated that the dielectric constant, impedance fluctuation, and differential skew were all affected by fiber weave style. For flattened fiber weaves, the dielectric constant fluctuation reached 0.18, the impedance fluctuation amplitude was 1.0 Ω, and the differential skew was 2 ps/in. For conventional fiber weaves, the three parameters were 0.44, 2.5 Ω, and 4 ps/inch respectively. Flattened fiber weave was more favorable for high-speed signal control. We also discussed the other methods to improve the fiber weave effect. It turned out that NE-glass (new electronic glass) fiber weave also had better performance in reducing impedance fluctuation and differential skew. Furthermore, made the signal traces and fiber weave bundles with an angle or designing the long signal line parallel to the weft direction both are simple and effective methods to solve this problem.

In view of the application requirements of electric propulsion system for China’s asteroid deep space exploration mission, the overall scheme is designed, an ion thruster prototype model is established by using a four-ring-cusp field discharge chamber, 30-cm beam current extraction diameter three-grid ion optics system. Reasonableness and compatibility of discharge chamber and grid design are verified experimentally and theoretically . The test results are shown below. The ion thruster can operate steadily over an input power envelope of 277–3120 W, thrust increases linearly from 9.9 to 117.2 mN, specific impulse rises from 1269 to 3492 s, the beam divergence angle drops from 30.7° to 26.8° and stabilizes above a certain power value, the thrust vector angle is less than 1.5° and beam flatness parameter is greater than 0.75 at different operating points. The maximum percentage reduction in grid gap aberration is 90% with the strain relief molybdenum mounting ring thermal design. This research provides a reference for multi-mode ion thruster design and in-orbit engineering applications.

In recent years, rehabilitation robot has received great attention. A large number of rehabilitation robots have been developed for gait training and walking assistance, but there are few applications for early rehabilitation after stroke. This paper presents a rehabilitation robot for progressive rehabilitation evaluated by surface electromyography (sEMG) and contact force signal. In order to make the trajectory planning of rehabilitation robot conform to the human bipedal walking, the structure design was based on multi-link. The rehabilitation robot can operate in three modes, each mode provides specific degree of assistance. When subjects doing rehabilitation training by the robot, sEMG from six lower limb muscles was collected to evaluate muscle activation. Meanwhile contact force between rehabilitation robot and subjects was also recorded for analysis. As assistance degree increased, lower limb activation and contact force decreased. It indicated different assistance demand of subjects in progressive treatment. For the rehabilitation robot, specific rehabilitation mode can be selected by subjects with different level dysfunction of lower extremities based on sEMG and contact force.