胶结充填体作为人工矿柱常受到邻近矿房开采的爆破扰动,严重影响其稳定性。基于KCC(Karagozian and Case Concrete)本构模型和ALE(Arbitrary Lagrangian-Eulerian)流固耦合算法,采用LS-DYNA软件开展胶结充填体受邻近矿房爆破扰动的数值...胶结充填体作为人工矿柱常受到邻近矿房开采的爆破扰动,严重影响其稳定性。基于KCC(Karagozian and Case Concrete)本构模型和ALE(Arbitrary Lagrangian-Eulerian)流固耦合算法,采用LS-DYNA软件开展胶结充填体受邻近矿房爆破扰动的数值模拟研究,考虑不同边孔间距(0.6、1.2、1.8、2.4 m)及养护龄期(14、21、28 d)影响,揭示充填体中爆破波传播规律,探究爆破扰动对胶结充填体的动力响应及其失稳破坏情况。结果表明:邻近采场爆破对胶结充填体的破坏损伤主要集中在边界处,为提高矿石回收率并保证充填体安全,建议采用边孔间距1.2 m方案;矿山爆破开采中充填体至少需要养护21 d;低龄期充填体矿柱顶底部区域是整个矿柱中的薄弱部分,易发生失稳,应予以重点监测。展开更多
关于自我参照处理中信念的作用,已有两种信念类型的提出:以自我为中心的信念和基于他人视角的信念。然而,这两种信念背后的神经机制仍不明确。为了区分与这两类信念相关的脑部过程,本研究采用ALE元分析方法,分析了自我特质判断任务与虚...关于自我参照处理中信念的作用,已有两种信念类型的提出:以自我为中心的信念和基于他人视角的信念。然而,这两种信念背后的神经机制仍不明确。为了区分与这两类信念相关的脑部过程,本研究采用ALE元分析方法,分析了自我特质判断任务与虚假信念任务的fMRI研究结果。结果表明,与虚假信念任务相比,在自我特质判断任务中,前扣带回(ACC)的活动显著增强。相反,左侧颞顶联合区(lTPJ)和背内侧前额叶皮层(dmPFC)被认为是自我特质判断任务与虚假信念任务共同激活的区域。基于这些结果,我们认为ACC可能在利用自我中心信念进行特质自我判断时发挥作用,即当自我知识中存在特质与稳定行为模式之间的关联时;而左侧TPJ和dmPFC可能在利用基于他人视角的信念进行自我特质判断时发挥作用,当自我中心信念不足以支持自我判断时,个体需要采纳他人视角进行判断。Two types of beliefs in self-referential processing have been proposed: self-centred beliefs and perspective-taking-based beliefs. However, the neural mechanisms underlying these two types of beliefs remain unclear. In order to distinguish the cerebral processes associated with these beliefs, an ALE meta-analysis was conducted by analysing the fMRI findings from self-judgment of trait tasks and false-belief tasks. The results demonstrated that the anterior cingulate gyrus (ACC) exhibited heightened activity during self-judgment of trait tasks in comparison to false-belief tasks. Conversely, the left temporal-parietal junction (lTPJ) and dorsomedial prefrontal cortex (dmPFC) were identified as common regions shared by both self-judgment of trait tasks and false-belief tasks. Based on these results, we thought that the ACC might be involved in the self-judgment of traits by using self-centered beliefs when there are relationships between traits and stable behavioral patterns in the self-knowledge;the left TPJ and the dmPFC might be involved in the self-judgment of traits by using perspective-taking-based beliefs, where individuals should make self-judgment by taking others’ perspectives when the self-centered beliefs do not sufficiently support the self-judgment.展开更多
文摘胶结充填体作为人工矿柱常受到邻近矿房开采的爆破扰动,严重影响其稳定性。基于KCC(Karagozian and Case Concrete)本构模型和ALE(Arbitrary Lagrangian-Eulerian)流固耦合算法,采用LS-DYNA软件开展胶结充填体受邻近矿房爆破扰动的数值模拟研究,考虑不同边孔间距(0.6、1.2、1.8、2.4 m)及养护龄期(14、21、28 d)影响,揭示充填体中爆破波传播规律,探究爆破扰动对胶结充填体的动力响应及其失稳破坏情况。结果表明:邻近采场爆破对胶结充填体的破坏损伤主要集中在边界处,为提高矿石回收率并保证充填体安全,建议采用边孔间距1.2 m方案;矿山爆破开采中充填体至少需要养护21 d;低龄期充填体矿柱顶底部区域是整个矿柱中的薄弱部分,易发生失稳,应予以重点监测。
文摘关于自我参照处理中信念的作用,已有两种信念类型的提出:以自我为中心的信念和基于他人视角的信念。然而,这两种信念背后的神经机制仍不明确。为了区分与这两类信念相关的脑部过程,本研究采用ALE元分析方法,分析了自我特质判断任务与虚假信念任务的fMRI研究结果。结果表明,与虚假信念任务相比,在自我特质判断任务中,前扣带回(ACC)的活动显著增强。相反,左侧颞顶联合区(lTPJ)和背内侧前额叶皮层(dmPFC)被认为是自我特质判断任务与虚假信念任务共同激活的区域。基于这些结果,我们认为ACC可能在利用自我中心信念进行特质自我判断时发挥作用,即当自我知识中存在特质与稳定行为模式之间的关联时;而左侧TPJ和dmPFC可能在利用基于他人视角的信念进行自我特质判断时发挥作用,当自我中心信念不足以支持自我判断时,个体需要采纳他人视角进行判断。Two types of beliefs in self-referential processing have been proposed: self-centred beliefs and perspective-taking-based beliefs. However, the neural mechanisms underlying these two types of beliefs remain unclear. In order to distinguish the cerebral processes associated with these beliefs, an ALE meta-analysis was conducted by analysing the fMRI findings from self-judgment of trait tasks and false-belief tasks. The results demonstrated that the anterior cingulate gyrus (ACC) exhibited heightened activity during self-judgment of trait tasks in comparison to false-belief tasks. Conversely, the left temporal-parietal junction (lTPJ) and dorsomedial prefrontal cortex (dmPFC) were identified as common regions shared by both self-judgment of trait tasks and false-belief tasks. Based on these results, we thought that the ACC might be involved in the self-judgment of traits by using self-centered beliefs when there are relationships between traits and stable behavioral patterns in the self-knowledge;the left TPJ and the dmPFC might be involved in the self-judgment of traits by using perspective-taking-based beliefs, where individuals should make self-judgment by taking others’ perspectives when the self-centered beliefs do not sufficiently support the self-judgment.
