By using the Abstract continuity theorem,we study the problem of periodic solution of the nonlinear neutral differential equation,and obtain sufficient conditions for the existence of periodic solutions related with delay,and proves conclusions in the literature.
在社会快速发展的影响下，我国各个领域的发展都取得了良好的成绩。经过实践调查我们发现，防渗渠道技术的整体实用性较强，所以受到了人们的广泛青睐，被大范围的运用到了水利工程项目施工建造之中，有效的促进了水利工程项目整体综合性能的提升。防渗渠道衬砌施工技术所具有的优越性是非常重要的，将这项技术加以合理的运用对于提升水利工程防渗漏性能能够起到积极的辅助作用。如果要想将防渗渠道技术加以实践运用，那么最为重要的就是需要对起加以全面的分析，并且需要对混凝土施工工艺加以综合管控，促进工艺水平的不断提升，这样才能够从根本上促进施工质量达到规定的标准要求。
针对工业机器人运行中效率和冲击的问题,提出一种基于多目标灰狼优化算法的时间与冲击最优的轨迹规划方法.对六自由度工业机器人建立数学模型,以五次多项式进行轨迹插值,构造以时间最短和冲击最小为目标的适应度函数,添加相应的运动学约束,采用多 目标灰狼优化算法(MOGWO)对轨迹进行优化,并对获得的Pareto解集进行归一化处理得到期望解.以珞石XB4型工业机器人为仿真对象,结果表明优化后的轨迹缩短了运行时间,减小了运动过程中的冲击,运动性能得到了提高.
针对骨支架的强度问题,采用有限元模拟分析的方法,构建三种不同单胞拓扑结构的三维模型,进行了有限元模拟运算.结合SLS技术,制备了不同单胞拓扑结构的多孔骨支架.并通过静态压缩试验评估了每种结构类型的骨支架所能承受的最大应力和最大承受力,得到了不同结构骨支架的力学性能差异.结果表明,仿真中最大应力呈现出FCC、CCP和SHC结构的递减规律,实物支架压缩的最大承受应力按照CCP、FCC和SHC降序排列.
With the rapid development of economy, the people, in pursuit of a better life, have destroyed the ecological environment, exposing the surface soil, gradual desertification, being vulnerable to external erosion, and aggravating water and soil loss. There is also an invisible force on the earth that constantly changes the geographical environment where human beings live. It is the Coriolis force. The terrain of China is high in the west and low in the east. Most rivers flow from west to east. Under the action of Coriolis force, they are subject to the geostrophic deflection force to the south, making the river scouring the south bank stronger than the north bank. With the change of geographical environment, the impacts in different regions are different. At the same time, the Coriolis force also affects the direction of China’s monsoon and ocean current, thus affecting the formation of precipitation in China to a certain extent. The intensity of precipitation then affects the intensity of water and soil loss. In areas with loose soil, the protection of water and soil loss should be strengthened, the construction of local ecological civilization should be strengthened, and the local economic development should be improved.
