drag-parachute

Influence of decreasing speed technology and decreasing pressure technology on quality and properties of magnesium alloy die castings;

减速减压工艺对镁合金压铸件质量与性能的影响

In crossing situation with a vessel approaching from forward of the beam, if decreasing speed is the only anti-collision measurement made by give-way vessel, TCPA and DCPA will regularly change with the decreasing range of give-way vessel s speed.

与正横前来船构成交叉相遇时 ,如让路船采取单用减速的措施 ,则随着减速幅度大小的变化 ,TCPA(最近会遇时间 )和 DCPA(最近会遇距离 )也按一定规律变化 ,文中结合数学推导 ,分析了两者的变化规律 ,从而为驾驶员确立最佳避让措施提供依据 。