With increasing reaction time, the cross linking reaction proceeded from the surface to core gradually to give a gelatin material with cross-linking degree gradient across the section.
研究发现，随着交联时间的延长，交联反应从明胶材料的表面至内部逐步进行，由此可获得交联度呈梯度变化的明胶材料。
The reaction cross section obtained includes the part from precompoundsingle and multistep processes and the part from compound reactions.
所得反应截面包括复合核前的一次过程和多次过程的反应截面以及复合核反应截面。
The reaction rate of neutrons with matter depends on the density of neutrons, their velocity, the nuclear density and the particular interaction cross section.
中子和物质的反应速度与中子的密度、中子的速度、原子核密度以及特有的反应截面有关。
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