松弛

With the rules of NDVI 〉 threshold 1 and NLBR 〈 threshold 2, the coastal protective forests of 2005 and 2000 were acquired, in which the thresholds were determined from the scatter plots of NDVI and NLBR.

研究发现，综合利用NDVI大于阈值1和NLBR小于阈值2，可以实现沿海防护林的快速提取，而阈值可以根据NDVI和NLBR的散点图确定。

At present,industrial artificial diamond technic is a conversion of carbon from graphite structure to diamond structure by the effect of catalyst alloy at high temperature and high pressure.

1引言金刚石和石墨是碳的两种同素异形体，化学成分都是纯碳，人造金刚石是在高温高压下经过触媒作用将石墨结构发生转变的结果。