Land is a main factor in food production, and cultivated land resources provide opportunity for the national food security. This study empirically estimates the impact of farmland protection on the security of grain supply in major grain-producing areas of China. For this purpose, from 2010 to 2019, panel data was collected from 13 main grain-producing provinces of China. The results revealed that the protection of cultivated land resources in the main grain-producing areas with direct means, incentives, and technological progress, significantly and positively impacted the security of grain supply. Furthermore, a mismatch was found between resource conditions and their use for grain production in the Northern region, and the lack of protection of cultivated land resources in the Southern region, which leads to the insignificant positive promotion of grain supply security. The results of the study strongly suggest that central and national governments of China need to provide a proper policy for the protection of cultivated land resources with equal emphasis on quantity, quality, and sustainability to ensure food security.

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Work Scope is key performance to the Demolition robot and is also a major factor consider to the users. CATIA and ADAMS were employed to design the 3D model and do the kinematics simulation to complete the design of work element of Demolition Robot. Parameters of assembly and interference detection of the 3D model was checked in the CATIA before taking the kinematics simulation experiment. The simulated result indicated that maximum radius, maximum depth and maximum height of Demolition Robot could be obtained, variance of forces at key articulated points and scope of work envelope diagram were presented, which provides a new method to analyze and design Demolition Robot.