文章采用有机分子焊接方法,将苝-3,4,9,10-四羧酸二酐(PTCDA)分子通过酰胺键焊接于Ti_(3)CN层间,制备了PTCDA分子焊接插层的Ti_(3)CN(Ti_(3)CN-PTCDA)。PTCDA分子焊接不仅扩大了Ti_(3)CN层状结构的层间距,而且提升了其层结构稳定性,从...文章采用有机分子焊接方法,将苝-3,4,9,10-四羧酸二酐(PTCDA)分子通过酰胺键焊接于Ti_(3)CN层间,制备了PTCDA分子焊接插层的Ti_(3)CN(Ti_(3)CN-PTCDA)。PTCDA分子焊接不仅扩大了Ti_(3)CN层状结构的层间距,而且提升了其层结构稳定性,从而显著提高了储钠倍率性能和循环稳定性。在0.1Ag^(-1)电流密度下,Ti_(3)CN-PTCDA材料的比容量经过895次循环后可达127.9 mAh g^(-1),当电流密度提升至5.0Ag^(-1)时仍可保持51.8 mAh g^(-1)。本研究证明,二维储钠材料的层结构对其储钠倍率和循环稳定性有重要影响,该结论为设计高倍率二维储钠材料提供了新思路。展开更多
针对锚固节理岩体在恒定法向刚度(constant normal stiffness,CNS)条件下剪切特性与破坏机制研究不足的问题,基于离散元模拟构建了锚固节理岩体数值模型,开展了系统的数值剪切实验。通过改变法向刚度、结构面粗糙度系数(joint surface r...针对锚固节理岩体在恒定法向刚度(constant normal stiffness,CNS)条件下剪切特性与破坏机制研究不足的问题,基于离散元模拟构建了锚固节理岩体数值模型,开展了系统的数值剪切实验。通过改变法向刚度、结构面粗糙度系数(joint surface roughness coefficient,JRC)、初始法向应力和锚杆弹性模量4个关键参数,探讨其对岩体剪切应力应变特征、法向应力演化、法向位移行为及内力响应的影响。结果表明:法向刚度对剪切应力应变曲线具有多阶段调控作用;JRC与峰值剪切应力呈近似指数关系,并显著影响法向应力的双阶段演化过程及法向位移曲线特征;初始法向应力调控剪切过程中的多阶段强度表现及法向位移的发展时序;锚杆弹性模量对峰值剪切应力具有非线性调控效应,低弹性模量强化效应平缓,高弹性模量则显著提升剪切应力,且其内力响应规律符合Boltzmann模型描述。研究揭示了CNS条件下多因素协同作用对锚固岩体剪切行为的影响机制,为岩土工程中锚固参数的合理选取与稳定性控制提供了理论支撑。展开更多
In the mammalian central nervous system(CNS),astrocytes are the ubiquitous glial cells that have complex morphological and molecular characteristics.These fascinating cells play essential neurosupportive and homeostat...In the mammalian central nervous system(CNS),astrocytes are the ubiquitous glial cells that have complex morphological and molecular characteristics.These fascinating cells play essential neurosupportive and homeostatic roles in the healthy CNS and undergo morphological,molecular,and functional changes to adopt so-called‘reactive’states in response to CNS injury or disease.In recent years,interest in astrocyte research has increased dramatically and some new biological features and roles of astrocytes in physiological and pathological conditions have been discovered thanks to technological advances.Here,we will review and discuss the wellestablished and emerging astroglial biology and functions,with emphasis on their potential as therapeutic targets for CNS injury,including traumatic and ischemic injury.This review article will highlight the importance of astrocytes in the neuropathological process and repair of CNS injury.展开更多
文摘文章采用有机分子焊接方法,将苝-3,4,9,10-四羧酸二酐(PTCDA)分子通过酰胺键焊接于Ti_(3)CN层间,制备了PTCDA分子焊接插层的Ti_(3)CN(Ti_(3)CN-PTCDA)。PTCDA分子焊接不仅扩大了Ti_(3)CN层状结构的层间距,而且提升了其层结构稳定性,从而显著提高了储钠倍率性能和循环稳定性。在0.1Ag^(-1)电流密度下,Ti_(3)CN-PTCDA材料的比容量经过895次循环后可达127.9 mAh g^(-1),当电流密度提升至5.0Ag^(-1)时仍可保持51.8 mAh g^(-1)。本研究证明,二维储钠材料的层结构对其储钠倍率和循环稳定性有重要影响,该结论为设计高倍率二维储钠材料提供了新思路。
基金supported by the National Natural Science Foundation of China(82171386,81971161,and 82201536)the Shanghai Science and Technology Development Foundation(22YF1458600)+1 种基金the Scientifc Foundation from Naval Medical University(2021QN08)the STI2030-Major Projects from Ministry of Science and Technology of China(2022ZD0204700).
文摘In the mammalian central nervous system(CNS),astrocytes are the ubiquitous glial cells that have complex morphological and molecular characteristics.These fascinating cells play essential neurosupportive and homeostatic roles in the healthy CNS and undergo morphological,molecular,and functional changes to adopt so-called‘reactive’states in response to CNS injury or disease.In recent years,interest in astrocyte research has increased dramatically and some new biological features and roles of astrocytes in physiological and pathological conditions have been discovered thanks to technological advances.Here,we will review and discuss the wellestablished and emerging astroglial biology and functions,with emphasis on their potential as therapeutic targets for CNS injury,including traumatic and ischemic injury.This review article will highlight the importance of astrocytes in the neuropathological process and repair of CNS injury.
