Effect of α-AlO Additive on the Surface Micro-Arc Oxidation Coating of Ti6Al4V Alloy.

α-AlO nanoparticles can enter a micro-arc oxidation coating and participate in the coating-formation process through chemical reaction or physical-mechanical combination in the electrolyte. The prepared coating has high strength, good toughness and excellent wear and corrosion resistance. In this paper, 0, 1, 3 and 5 g/L of α-AlO nanoparticles were added to a NaSiO-Na(PO) electrolyte to study the effect on the microstructure and properties of a Ti6Al4V alloy micro-arc oxidation coating.

Out-of-Plane Compression Behaviour of Aluminum Alloy Large-Scale Super-Stub Honeycomb Cellular Structures.

The out-of-plane compression behaviour of 6061-T6 aluminum alloy super-stub honeycomb cellular structures without and with friction stir welding (FSW) facesheets are presented in this paper. A total of twelve axially compressed experiments on large-scale specimens, six with square hollow section (SHS) cores and six with hexagonal hollow section (HHS) cores, were conducted, with failure modes, ultimate resistances and axial load-end shortening curves analysed. The accuracy of finite element (FE) models was validated in accordance with test results.

Effect of Hydrothermal Method Temperature on the Spherical Flowerlike Nanostructures NiCo(OH)-NiO.

NiCo(OH)-NiO composite electrode materials were prepared using hydrothermal deposition and electrophoretic deposition. NiCo(OH) is spherical and flowerlike, composed of nanosheets, and NiO is deposited on the surface of NiCo(OH) in the form of nanorods. NiCo(OH) has a large specific surface area and can provide more active sites.

A First-Principle Study of Interactions between Magnesium and Metal-Atom-Doped Graphene.

In this study, the interactions of magnesium (Mg) atom and Mg(001) surface with different metal-atom-doped graphene were investigated using a density functional theory (DFT) method. For the interactions of magnesium with Al-, Mn-, Zn-, and Zr-doped and intrinsic graphene, it was found that the magnesium atoms were physisorbed into the hollow sites of the intrinsic graphene with only the smallest interaction energy (approximately -1.900 eV).

Three dimensional stabilization controller based on improved quaternion transformation for fixed-wing UAVs.

To realize the three-dimensional stabilization control of fixed-wing unmanned aerial vehicles (UAVs), we analyze the nonholonomic characteristics, constraint non-integrability, and controllability of UAVs. To simplify the trigonometric function term in the dynamics of the UAV and avoid the singularity problem of the Euler angle in describing attitude, we use the quaternion theory to transform the dynamics of the UAV to avoid the complex trigonometric function derivation, which makes the dynamic matrix more concise. Based on this, a continuous periodic time-varying controller (CPTVC) is designed, and the effectiveness of the controller is proved using the homogeneous method.