Gas barrier property and microstructure of reduced graphene oxide/polyethyleneimine multilayer films created via recast and layer-by-layer deposition processes.

Vehicle engineering materials are used in manufacturing of vehicle. Its status quo and development trend are analyzed. Proportion of steel in structure material will reduce stage by stage. With reliable performance, steel will be replaced by light and new-style materials such as aluminous alloy, compound materials. Plentiful developing rapidly new materials, such as macromolecule materials, compound materials, offer necessary condition to develop vehicle.

Magnetorheological elastomers air spring, a practical new paten t is introduced, which is composed of magnetorheological elastomers, up-board, down-board and control system. The control system adjusts air pressure and real time stiffness. The air spring can enhance car capability of shock absorption, riding ride and steering stabilization, which can be applied to car’s suspension system.

In this study, four varieties of rice were cultivated on the same farmland under same conditions and for same duration. However, their lodging resistance was found to be obviously different from each other. Herein, three key factors that highly influenced the lodging resistance were identified. First, in terms of morphological trait, in contrast to the generally believed theory that the overall thickness of the fresh culm wall governs the strength, the thickness of the depressed region of the dried basal culm wall largely determined the mechanical properties by acting as the weak link. This depressed region represents the vulnerable part with high syneresis rate. Second, the culm and its carbon framework exhibited sufficient strength and rigidity for both support and stability of the rice stem. The constraint of high lodging resistance of rice plants is attributed to the culm flexibility. Furthermore, the results of the positron annihilation lifetime spectroscopy corroborate that the most amorphous part and the highest-fraction free volume in the culm carbon framework were found for samples that exhibited high lodging resistance. This result confirmed the significant influence of the culm flexibility on lodging resistance. Third, a higher level of nitrogen element content in the basal culm can benefit its growth and development, which may contribute to an increase in lodging resistance of rice plants.

A vibrational energy-recycling vibration damper is introduced which can recycle some vibrational energy by exporting pressurized oil from rebound cavity to energy accumulator. Pressurized oil can be used for HPS, hydraulic power braking and so on which saves energy. Nonlinear parameterized model of damping characteristics is constructed by fluid mechanics theory, and simulation is made under MATLAB. The results show that damping characteristics of the vibration damper is better than conventional dampers.