the substituent effects(the electronic effect, steric effect and position of substituted groups) on the benzene ring were investigated.
计算的取代基效应与有机电子论的预测相一致。
the reinforced concrete has an obvious steric effect in real earthquakes. there is a complicated coupling between the axis force and compound bending which change in side columns and angle posts.
nmr relaxation times of four protons at different positions versus steric effect and mixing proportion in ligand mixtures were monitored.
实验监测了配体中不同位置的质子的nmr弛豫时间随空间距离及配体比例改变的变化情况 。
steric effect of organophosphorus acid extractants (opa) with the structure of r(r')p(o)oh plays an important role in the selectivity for different metals.