Stewart platform is a typical parallel manipulator, which is equipped with rigidity, high positioning accuracy and other advantages. To achieve wonderful fit of the spacesuit upper torso, the Stewart platform is applied in the upper torso fit design, by which the upper torso active fit design method is proposed. The mathematical model and the experimental model are established to study the validly of the fit design method. The results verify that the application of Stewart platform in the fit design of spacesuit upper torso is feasible. The research in this paper provides useful guide for the fit design of the spacesuit in the future
A homogeneous Ni (OH)2/graphene nanosheet (GNS) nanocomposite with excellent supercapacitive performance has been synthesized by a facile chemical precipitation. The Ni (OH)2/GNS nanocomposite presented an ideal morphology with the nanosized Ni (OH)2 particles homogeneously growing on the GNS. Its microstructure, morphology were investigated by XRD, SEM and TEM. The electrochemical performance of the Ni (OH)2/GNS nanocomposite was test by cyclic voltammetry, galvanostatic charge−discharge and electrochemical impedance spectroscopy techniques. The homogeneous Ni (OH)2/GNS nanocomposite exhibited a high specific capacitance of 1667 F/g at a current density of 1A/g and maintained a good stability in 5000 cycles, suggesting that it can be a promising candidate for supercapacitor. The high specific capacitance and remarkable rate capability are promising for applications in supercapacitors with both high energy and power densities. The Ni (OH)2/GNS nanocomposite exhibited large specific capacitance, high rate capability and good cycling stability.
In the present work, 2024Al alloy was rolled before solid solution, between solid solution and aging, and after aging treatments. Precipitation sequence in 2024 Al has not been altered by the rolling treatment. However, peak aging temperature of S’ phase was decreased from 264 to 254 oC, implying that the process of S’precipitation was accelerated by the deformation. After thermo-mechanical treatments, precipitates werefiner dispersed, and finest precipitate distribution was observed after treatment III (rolling between solid solution and aging), while precipitate size was all smaller than 240nm and more than 95% precipitates was smaller than 200nm. The highest dislocation density was found in 2024Al alloy after treatment III since the dislocations generated during deformation was slightly decreased during following low temperature aging treatment. Therefore, in order to improve the mechanical properties, it is suggested that the rolling treatment should be performed between solid solution and aging treatment.
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