Perturbation calculation will be required to rapidly determine the changes of reactivity caused by core neutron cross sections perturbation in reactor physics design and analysis.
在反应堆物理设计和分析时，经常要进行微扰计算，以快速分析堆芯中子截面扰动下反应性的变化量。
Objective To observe the changes of cerebrovascular reactivity (CVR) in cerebral infarct, and ascertain the correlation between them.
目的观察脑梗死患者脑血管反应性(CVR)变化，确定两者之间的相关性。
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