To help improve the comfort of an amputee, it is important to develop artificial skin to understand the load distribution between the residual limb and the prosthetic socket for a prosthetic socket system. This paper presents an interfacial stress sensor which is capable of simultaneously measuring normal compressive stress and horizontal shear stress and is expected to create an artificial skin to understand such load distribution. A mathematical model based on regression analysis is built and an experiment is conducted to obtain the transfer function of the sensor. A significance test shows that the transfer function has a statistical significance at a significance level of 0.05 and the regression model fits the experimental data with a sample determination coefficient (R 2 ) > 0.95. The relative error is also analyzed in the end. The results show that the sensor is capable of measuring a range 0-320 kPa normal compressive stress with a relative error of 5% and a range of 0-70 kPa horizontal shear stress with a relative error of 14%.Index Terms-Artificial skin, interfacial stress sensor, prosthetic socket, residual limb, transfer function.

This study investigates the mechanical response of aluminum foam sandwich panels, sandwich cylindrical shells, and sandwich shallow shells under impact loads. First, a finite element model of the sandwich panel was established, and an impact load was applied. The numerical results were compared with theoretical and experimental results to verify the model's effectiveness. Second, the energy absorption efficiency and overall deformation of sandwich panels, sandwich cylindrical shells, and sandwich shallow shells under the same impact load were studied. The research shows that the energy absorption performance of the sandwich shells is better than that of the sandwich panels, and the overall deformation is less than that of the sandwich panels. The effect of increasing panel thickness on the two types of sandwich shell studies is based on this basis. The conclusions describe that increasing the panel thickness will significantly reduce the structure's energy absorption efficiency and deformation. Finally, the effect of single-and double-layer structure on the impact resistance of sandwich shells was studied when the total thickness of the sandwich structure was unchanged. The results show that compared with the single-layer structure, the energy absorption efficiency, overall deformation, and contact force between the projectile and structure of the double-layer structure will be reduced.

Based on an effective screen-printing process, a novel sandwich layered cathode electrode was developed on a cathode faceplate. The ZnO electrode was sandwiched between an indium tin oxide (ITO) electrode layer and a silver electrode layer, and the carbon nanotube was prepared directly on the exposed ITO electrode layer surface. The cathode potential could be conducted to the carbon nanotube with the sandwich layered cathode electrode. Using the carbon nanotube as a field emitter, a triode field emission display prototype with a sandwich layered cathode electrode was fabricated, which possessed a better field emission characteristic, higher luminous brightness and better emission image luminance uniformity. The turn-on electric field was 1.88 V/ m and the measured maximum field emission current was 2273.6 A at 3.19 V/ m. By the method of adjusting the field emission current, the electron-emitting uniform capacity of the carbon nanotube cold cathode could be modified, and the emission image luminance uniformity and the emission current stability of triode field emission display prototype was also be improved significantly. The emission current fluctuation of the sandwich layered cathode electrode type field emission display was less than 1.1%. Furthermore, the total manufacture cost of the triode field emission display prototype was low.