... 量 把时域的正弦运算变换为复数运算 对应 拉氏变换： 时域函数f(t)(原函数) 复频域函数F(s)(象函数) 因果函数(causal function) f ( t )仅存在于t 0的时间区间 0 ) ( ) ( dt e t f s F st 如果f(t)存在于整个时间区间，则用f(t)ε(t) 表示因果...
It found “evidence of a causal relationship, ” but not proof of one, between pollution from vehicles and impaired lung function and accelerated hardening of the arteries.
机动车污染不仅会损伤肺功能，而且会加速血管硬化。
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Results Causal-uncertainty of middle school teachers had apparent prediction function to their state and trait anxiety, and the decisive coefficients were 8.1% and 13.0% respectively.
Finally, by introducing into the impact on investor sentiment, the paper study the dynamic forms of the causal relation of them using impulse response function and variance decomposition.