摘要: This chapter is devoted to the physical-layer security. The chapter starts with discussion on security issues, followed by the introduction of information-theoretic security, and comparison against...关键词: Optical transmitters Radio frequency Antenna arrays Security Optical sensors Optical beams ...
本文根据本项目13年的大樱桃花芽冻害发生情况,结合相关的气象资料对花芽冻害做了初步分析,经分析可知,所调查品种的花芽受冻时间主要不是发生在冬季极端低温发生时,也不是三月上,中旬低温发生时.三月下旬的低温,可能对花芽造成一定的危害,这决定于物候期进程与低温强度及时间,进程越快,强度越大,时间越长,冻害越重,但...