It has been proved that normalized total gravity gradient method can be effectively used to ascertain the existence and exact location of single (or several) nonuniform density body.
重力归一化总梯度法用于研究单个或为数不多的密度不均匀体的分布和位置，已被证明是有效的。
A method calculating one body density matrix of nucleus in the mean field shell model is proposed.
提出平均场壳模型下原子核单体密度矩阵的一种计算方法，验证该方法的可靠性。
YAG powders obtained by nitrates crystallization method are severely agglomerated, the maximum relative density of the sintered body is only 74.3%.
硝酸盐混晶体煅烧得到的YAG粉体团聚严重，烧结体最大相对密度仅为74.3%；
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