Using the strong background magnetic field produced by effective electromagnet and the catching surface to produce high magnetic field gradient makes the separation of micro-grade material possible.

利用有效电磁体产生的强背景磁场和能产生高磁场梯度的捕集表面，使得分选微米级的物料成为可能。

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By analyzing the relationship between speed loss, speed discount in different gradient and grade length, the paper also brings forward the maximum longitudinal gradient and grade length limit.

通过速度折减量与坡长之间的关系曲线，提出基于运行速度差和满足公路服务水平要求的各级公路最大纵坡坡度与坡长限制值。

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So the relationship between longitudinal gradient, grade length limit, vertical curve and safety is analyzed, which can be referred to improve the safety and optimize the profile design.

根据下坡路段事故统计资料，分析纵坡坡度、坡长、竖曲线和下坡衔接平曲线与道路安全的关系，为提高长大下坡路段安全，优化纵面设计提供参考。

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