The hose-drogue system is a common method for soft aerial refueling,whereby the refueling tanker tows the drogue through the hose.In this paper,a mathematical-physical model of the hose-drogue system is developed and ...The hose-drogue system is a common method for soft aerial refueling,whereby the refueling tanker tows the drogue through the hose.In this paper,a mathematical-physical model of the hose-drogue system is developed and simulated using the Absolute Nodal Coordinate Formulation(ANCF)finite element method.A numerical solution program based on ANCF and ALE(Arbitrary Eulerian-Lagrange)-ANCF method was developed to simulate and analyze the horizontal and elongation release processes of the hose-drogue system at different towing points(underneath the wing and the belly of the aircraft).This program was developed by introducing an ALE description.The numerical solution program,developed based on the ANCF and ALE-ANCF methods,represents a significant advancement in computational efficiency for the rigid-flexible coupled multibody system of the air refueling hose-drogue system.This program can provide a valuable reference for the qualitative design of the hose-drogue multibody system in soft air refueling,while maintaining the necessary accuracy.展开更多
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
基金the support from the National Natural Science Foundation of China(No.52472384)the Fundamental Research Funds for the Central Universities,China(No.G2024KY0615)+1 种基金sponsored by the Foundations of National Key Laboratory of Unmanned Aerial Vehicle Technology in NPU,(No.WR202411-2)the National Key Laboratory of Aircraft Configuration Design,China(No.JBGS-2024-01)。
文摘The hose-drogue system is a common method for soft aerial refueling,whereby the refueling tanker tows the drogue through the hose.In this paper,a mathematical-physical model of the hose-drogue system is developed and simulated using the Absolute Nodal Coordinate Formulation(ANCF)finite element method.A numerical solution program based on ANCF and ALE(Arbitrary Eulerian-Lagrange)-ANCF method was developed to simulate and analyze the horizontal and elongation release processes of the hose-drogue system at different towing points(underneath the wing and the belly of the aircraft).This program was developed by introducing an ALE description.The numerical solution program,developed based on the ANCF and ALE-ANCF methods,represents a significant advancement in computational efficiency for the rigid-flexible coupled multibody system of the air refueling hose-drogue system.This program can provide a valuable reference for the qualitative design of the hose-drogue multibody system in soft air refueling,while maintaining the necessary accuracy.
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.
