For searching the burst cause of PVC-U pipes during hydrolic test under low pressure, the cracked sections of those PVC-U pipes were observed and the defective particles were found in them.
为探索在试压时低压下即破裂的硬聚氯乙烯 (PVC U)管材的破裂原因 ,对这些破裂管材的断裂面进行了仔细观察 ,发现在这些断裂面上均有缺陷粒子存在。
N d is related to bulk atom defects and rests with ionized intrinsic and extrinsic shallow donors Zn ′ i,Zn ″ i, Al * Zn at room temperature.
Nd与体内原子缺陷有关 ,室温下主要取决于电离的浅能级本征和非本征施主Zn·i,Zn¨i和Al·Zn,Ns和Es与界面原子缺陷密度和性质有关 。