为研究冲积土中地下爆炸自由场应力波的传播特性,利用中心起爆的10 kg TNT和30 kg TNT炸药球,开展了3发不同埋深的地下封闭填实爆炸试验,获得了该场地自由场加速度、速度及位移等冲击参数。通过对实测数据的分析得出,不同当量的地下封...为研究冲积土中地下爆炸自由场应力波的传播特性,利用中心起爆的10 kg TNT和30 kg TNT炸药球,开展了3发不同埋深的地下封闭填实爆炸试验,获得了该场地自由场加速度、速度及位移等冲击参数。通过对实测数据的分析得出,不同当量的地下封闭填实爆炸激发的粒子比加速度、粒子速度及粒子比位移符合爆炸相似率,实测加速度、速度及位移参数的峰值约为经验拟合公式的0.4~1.6倍;不同当量爆炸实验获得的粒子速度上升时间不符合爆炸相似率,上升时间与粒子速度峰值和当量均有一定相关性,上升时间和速度峰值之间的关系不能视为材料自身属性;当爆炸当量为基准实验当量的0.3~3.4倍时,可用基准实验测定的上升时间和速度峰值之间的关系来预测评估其他当量爆炸的实验结果,超出上述范围时,预测的结果可能会造成较大偏差。展开更多
First principles calculation is performed to study the co-adsorption behaviors of O_(2)and CO_(2)onδ-Pu(100)surface by using a slab model within the framework of density functional theory(DFT).The results demonstrate...First principles calculation is performed to study the co-adsorption behaviors of O_(2)and CO_(2)onδ-Pu(100)surface by using a slab model within the framework of density functional theory(DFT).The results demonstrate that the most favorable co-adsorption configurations are T_(v)-C_(4)O_(7)and T_(p1)-C_(2)O_(8),with adsorption energy of-17.296 e V and-23.131 e V for CO_(2)-based and O_(2)-based system,respectively.The C and O atoms mainly interact with the Pu surface atoms.Furthermore,the chemical bonding between C/O and Pu atom is mainly of ionic state,and the reaction mechanism is that C 2 s,C 2 p,O 2s,and O 2p orbitals overlap and hybridize with Pu 6 p,Pu 6 d,and Pu 5 f orbital,resulting in the occurrence of new band structure.The adsorption and dissociation of CO_(2)molecule are obviously promoted by preferentially occupying adsorbed O atoms,therefore,a potential CO_(2)protection mechanism for plutonium-based materials is that in CO_(2)molecule there occurs complete dissociation of CO_(2)→C+O+O,then the dissociated C atom combines with O atom from O_(2)dissociation and produces CO,which will inhibit the O_(2)from further oxidizing Pu surface,and slow down the corrosion rate of plutoniumbased materials.展开更多
文摘为研究冲积土中地下爆炸自由场应力波的传播特性,利用中心起爆的10 kg TNT和30 kg TNT炸药球,开展了3发不同埋深的地下封闭填实爆炸试验,获得了该场地自由场加速度、速度及位移等冲击参数。通过对实测数据的分析得出,不同当量的地下封闭填实爆炸激发的粒子比加速度、粒子速度及粒子比位移符合爆炸相似率,实测加速度、速度及位移参数的峰值约为经验拟合公式的0.4~1.6倍;不同当量爆炸实验获得的粒子速度上升时间不符合爆炸相似率,上升时间与粒子速度峰值和当量均有一定相关性,上升时间和速度峰值之间的关系不能视为材料自身属性;当爆炸当量为基准实验当量的0.3~3.4倍时,可用基准实验测定的上升时间和速度峰值之间的关系来预测评估其他当量爆炸的实验结果,超出上述范围时,预测的结果可能会造成较大偏差。
文摘First principles calculation is performed to study the co-adsorption behaviors of O_(2)and CO_(2)onδ-Pu(100)surface by using a slab model within the framework of density functional theory(DFT).The results demonstrate that the most favorable co-adsorption configurations are T_(v)-C_(4)O_(7)and T_(p1)-C_(2)O_(8),with adsorption energy of-17.296 e V and-23.131 e V for CO_(2)-based and O_(2)-based system,respectively.The C and O atoms mainly interact with the Pu surface atoms.Furthermore,the chemical bonding between C/O and Pu atom is mainly of ionic state,and the reaction mechanism is that C 2 s,C 2 p,O 2s,and O 2p orbitals overlap and hybridize with Pu 6 p,Pu 6 d,and Pu 5 f orbital,resulting in the occurrence of new band structure.The adsorption and dissociation of CO_(2)molecule are obviously promoted by preferentially occupying adsorbed O atoms,therefore,a potential CO_(2)protection mechanism for plutonium-based materials is that in CO_(2)molecule there occurs complete dissociation of CO_(2)→C+O+O,then the dissociated C atom combines with O atom from O_(2)dissociation and produces CO,which will inhibit the O_(2)from further oxidizing Pu surface,and slow down the corrosion rate of plutoniumbased materials.
