摘要：Higher-order topological insulators(HOTIs),with topological corner or hinge states,have emerged as a thriving topic in the field of topological ***,few connections have been found for HOTIs with well-explored first-order topological *** a proposal asserted that a significant bridge can be established between the HOTIs and Z2 topological *** subjected to an inplane Zeeman field,corner states,the signature of the HOTIs,can be induced in a Z2 topological *** Zeeman fields can be produced,for example,by the ferromagnetic proximity effect or magnetic atom doping,which drastically increases the experimental ***,we show that a phononic crystal,designed as a bilayer of coupled acoustic cavities,exactly hosts the Kane-Mele model with built-in in-plane Zeeman *** helical edge states along the zigzag edges are gapped,and the corner states,localized spatially at the corners of the samples,appear in the *** verifies the Zeeman field induced higher-order *** further demonstrate the intriguing contrast properties of the corner states at the outer and inner corners in a hexagonal ring-shaped sample.

摘要：K-ion batteries(KIBs)hold great promise for large-scale energy ***,the absence of suitable cathode materials limits their practical ***,rationally designing advanced cathode materials for KIBs remains an open *** this work,based on density functional theory calculations,we find that the bond stability of Fe–O is higher than that of Co–O in layered transitional metal(TM)***,the K-ion migration in the Fe-based layered TM oxide has a significantly lower activation energy barrier than that in the Co-based *** on this theoretical prediction,we successfully synthesized a low-cost K_(0.45)Ni_(0.1)Fe_(0.1)Mn_(0.8)O_(2)cathode,which shows excellent structural stability and superior K-storage properties,including durable cycle life and high-rate ***,the designed K_(0.45)Ni_(0.1)Fe_(0.1)Mn_(0.8)O_(2)cathode possesses a great full-cell performance with a discharge capacity of~75 mA h g^(-1) and capacity retention of~80%after 100 *** results show that Fe has better structural stability and K-ion diffusion than high-cost Co in layered oxide cathodes,and this finding provides new insights into the design of low-cost and high-performance KIB layered *** work highlights the feasibility of a theory-guided experiment in screening promising battery materials.

摘要：针对Zr-Sn-Nb合金板材开展了气相渗氢研究,重点研究了渗氢时间和渗氢后退火时间对氢含量及其分布的影响。结果表明,随着渗氢时间的增加,氢化物含量增多,氢化物出现聚集,形成缠绕生长的条状结构,最终逐渐呈现细小网状分布;退火过程氢原子从外表面向壁厚中心位置扩散,从两端向中部扩散;氢化物含量越高,退火时间越长,氢化物扩散越充分,条状氢化物分解为多个细小氢化物并弥散均匀分布在锆基体中。应用指数函数对氢含量-渗氢时间的规律进行拟合,获得了Zr-Sn-Nb合金定量渗氢工艺与氢含量的对应关系。

摘要：自动化电网配电系统的构建,有利于促进电网供电流程稳定性与安全性的进一步提升。为此,我国智能化电网配电系统要加强研究力度,进一步增强智能电网的建设与发展。基于此,笔者针对当前我国电力信息系统的发展状态,对智能电网背景下的自动化配电系统进行研究,以期为电网供电与运行的稳定性提供保障。

摘要：进行了五步离散归零神经网络算法的稳定性分析,证明了其收敛阶为O(τ4)。针对二连杆机械臂轨迹生成问题,设计了五步离散归零神经网络控制器,与欧拉离散归零神经网络控制器进行了对比实验研究。

摘要：实证主义、行为主义、建构主义、多元智能、整体教育以及后现代主义等理论思想是教育教学评价的基础,在不同时期对教育教学评价产生了深刻影响,当前的大学体育学习评价改革仍然要以这些理论为依据。新的教育理论和心理学理论关注学生成长与全面发展,这就要求大学体育学习评价体系在重构时强调评价的个体化、差异化和多元化。我国大学体育学习评价的改革需要变更教师教育模式;重新设计体育课程;动态化、螺旋式改进体育学习评价的方案,阶段性、逐步推进实施。对大学体育学习评价体系的研究,旨在为我国大学体育教学评价的改革提供新的思路,以推动大学体育教学的改革与发展。

摘要：针对任意初态误差,在时间轴上设计一段随迭代次数增加而缩短的修正区间。结合迭代学习控制算法,机械臂在每次迭代时无需重置初始条件,经过多次迭代学习后,实现跟踪误差渐近收敛于零。在λ范数意义下,证明迭代学习控制算法的收敛性,仿真结果验证该方法的可行性和有效性。