The existence of global solution and the blow-up problem for a model of nuclear reactorsare discussed by using the upper-lower solution and energy estimate methods; asymptoticbehavior of global solution is also discus...The existence of global solution and the blow-up problem for a model of nuclear reactorsare discussed by using the upper-lower solution and energy estimate methods; asymptoticbehavior of global solution is also discussed with the aid of L_p estimate and semigroupmethod for this model. Nice results, which explain the phenomenon of nuclear reactorsbetter, are obtained.展开更多
This work focuses the effect of alkali-NaOH solution on the nature of synthesized zeolite from 2：1 Tunisian clays. This study was achieved using correlation between results obtained from X-ray diffraction （XRD） and...This work focuses the effect of alkali-NaOH solution on the nature of synthesized zeolite from 2：1 Tunisian clays. This study was achieved using correlation between results obtained from X-ray diffraction （XRD） and MAS-NMR analysis. Preliminary treatment was adopted to prepare the starting sample that is placed in contact with NaOH solution at variable concentration. A specific hydrothermal reactor, allowing the control ofpH 〉 9, temperature and a continuous stirring of the sample in the NaOH solution; was used to achieve these syntheses. The obtained results showed that, for concentration value ~IN, the final complex presented characteristic XRD and MAS-NMR line of zeolite P. For 3N solution concentration we obtained zeolite HS. All synthesize process are controlled by XRD and MAS-NMR investigation.展开更多
应用欧拉两相流最新CFD模型技术对某溶液反应堆台架模型堆芯内气液两相流动传热进行了数值分析。堆芯内离散相气泡被考虑为不同直径的组分,摒弃了传统均一离散相的假设(即假设所有气泡为同一直径和形状),把应用群体平衡理论建立起来的MU...应用欧拉两相流最新CFD模型技术对某溶液反应堆台架模型堆芯内气液两相流动传热进行了数值分析。堆芯内离散相气泡被考虑为不同直径的组分,摒弃了传统均一离散相的假设(即假设所有气泡为同一直径和形状),把应用群体平衡理论建立起来的MUSIG(Multiple-Size-Group)模型考虑到CFD分析中。MUSIG模型用于分析堆芯内气泡的流动和大小分布。将气体离散相采用分为5组不同直径的气泡直径。分别采用Luo and Svendsen和Prince and Blanch模型描述不同直径气泡组之间的破裂和聚合。模拟结果与台架实验结果吻合较好。展开更多
文摘The existence of global solution and the blow-up problem for a model of nuclear reactorsare discussed by using the upper-lower solution and energy estimate methods; asymptoticbehavior of global solution is also discussed with the aid of L_p estimate and semigroupmethod for this model. Nice results, which explain the phenomenon of nuclear reactorsbetter, are obtained.
文摘This work focuses the effect of alkali-NaOH solution on the nature of synthesized zeolite from 2：1 Tunisian clays. This study was achieved using correlation between results obtained from X-ray diffraction （XRD） and MAS-NMR analysis. Preliminary treatment was adopted to prepare the starting sample that is placed in contact with NaOH solution at variable concentration. A specific hydrothermal reactor, allowing the control ofpH 〉 9, temperature and a continuous stirring of the sample in the NaOH solution; was used to achieve these syntheses. The obtained results showed that, for concentration value ~IN, the final complex presented characteristic XRD and MAS-NMR line of zeolite P. For 3N solution concentration we obtained zeolite HS. All synthesize process are controlled by XRD and MAS-NMR investigation.
文摘应用欧拉两相流最新CFD模型技术对某溶液反应堆台架模型堆芯内气液两相流动传热进行了数值分析。堆芯内离散相气泡被考虑为不同直径的组分,摒弃了传统均一离散相的假设(即假设所有气泡为同一直径和形状),把应用群体平衡理论建立起来的MUSIG(Multiple-Size-Group)模型考虑到CFD分析中。MUSIG模型用于分析堆芯内气泡的流动和大小分布。将气体离散相采用分为5组不同直径的气泡直径。分别采用Luo and Svendsen和Prince and Blanch模型描述不同直径气泡组之间的破裂和聚合。模拟结果与台架实验结果吻合较好。
