The recent inclusion of chronic obstructive pulmonary disease(COPD)in China’s national basic public health services(NBPHS)represents a historic milestone—marking the first time a chronic respiratory disease has been...The recent inclusion of chronic obstructive pulmonary disease(COPD)in China’s national basic public health services(NBPHS)represents a historic milestone—marking the first time a chronic respiratory disease has been incorporated into this programme.This article examines the medical and socio-economic significance of integrating COPD management into the NBPHS,evaluates current efforts to address the disease burden,and discusses their alignment with broader health objectives outlined in Healthy China 2030.展开更多
随着多领域高端装备的快速升级与发展,迫切需要面向复杂服役工况的高性能热流承载结构优化设计。然而,缺乏热流耦合物理场的高效求解手段以及考虑复杂边界条件的热流承载结构设计能力不足仍是制约装备更新换代速度和质量的两大关键问题...随着多领域高端装备的快速升级与发展,迫切需要面向复杂服役工况的高性能热流承载结构优化设计。然而,缺乏热流耦合物理场的高效求解手段以及考虑复杂边界条件的热流承载结构设计能力不足仍是制约装备更新换代速度和质量的两大关键问题。因此,提出了一种新的无网格粒子方法——等几何粒子流体动力学方法(NURBS-based particle hydrodynamics,NBPH)。通过配置真伪粒子,基于非均匀有理B样条(Non-uniform rational B-splines,NURBS)基函数的插值构建粒子通讯,缓解了偏微分方程数值求解质量与分析域离散化程度之间的强耦合关系,提升了算法的计算效率。其次,将所提出的NBPH方法与固体各向同性材料惩罚(Solid isotropic material with penalization,SIMP)方法结合,搭建了一种新的无网格法拓扑优化框架——NBPH-topology Optimization,用于复杂热流场景的优化设计。根据体素分布构造了粒子流动阻力场,实现了流场与结构场的关联,通过求解连续伴随灵敏度,指导结构拓扑的连续演化。为了验证NBPH-TO框架的有效性和鲁棒性,研究了液冷和风冷两大典型散热场景,完成了优化设计与实验验证,结果表明该研究为复杂热流承载结构拓扑优化设计提供了可行的解决方案和有效的数值工具。展开更多
基金Supported by the Noncommunicable Chronic Diseases-National Science and Technology Major Project(grant number 2023ZD0506003).
文摘The recent inclusion of chronic obstructive pulmonary disease(COPD)in China’s national basic public health services(NBPHS)represents a historic milestone—marking the first time a chronic respiratory disease has been incorporated into this programme.This article examines the medical and socio-economic significance of integrating COPD management into the NBPHS,evaluates current efforts to address the disease burden,and discusses their alignment with broader health objectives outlined in Healthy China 2030.
文摘随着多领域高端装备的快速升级与发展,迫切需要面向复杂服役工况的高性能热流承载结构优化设计。然而,缺乏热流耦合物理场的高效求解手段以及考虑复杂边界条件的热流承载结构设计能力不足仍是制约装备更新换代速度和质量的两大关键问题。因此,提出了一种新的无网格粒子方法——等几何粒子流体动力学方法(NURBS-based particle hydrodynamics,NBPH)。通过配置真伪粒子,基于非均匀有理B样条(Non-uniform rational B-splines,NURBS)基函数的插值构建粒子通讯,缓解了偏微分方程数值求解质量与分析域离散化程度之间的强耦合关系,提升了算法的计算效率。其次,将所提出的NBPH方法与固体各向同性材料惩罚(Solid isotropic material with penalization,SIMP)方法结合,搭建了一种新的无网格法拓扑优化框架——NBPH-topology Optimization,用于复杂热流场景的优化设计。根据体素分布构造了粒子流动阻力场,实现了流场与结构场的关联,通过求解连续伴随灵敏度,指导结构拓扑的连续演化。为了验证NBPH-TO框架的有效性和鲁棒性,研究了液冷和风冷两大典型散热场景,完成了优化设计与实验验证,结果表明该研究为复杂热流承载结构拓扑优化设计提供了可行的解决方案和有效的数值工具。
