摘要：The rate-determining process for sodium storage in TiO2 is greatly depending on charge transfer happening in the electrode materials owing to its inferior diffusion coefficient and electronic *** from reducing the diffusion distance of ion/electron,the increasement of ionic/electronic mobility in the crystal lattice is also very important for charge ***,an oxygen vacancy(OV)engineering assisted in high-content anion(S/Se/P)doping strategy to enhance charge transfer kinetics for ultrafast sodium-storage performance is *** calculations indicate that OV-engineering evokes spontaneous S doping into the TiO2 phase and achieves high dopant concentration to bring about impurity state electron donor and electronic delocalization over S occupied sites,which can largely reduce the migration barrier of Na+.To realize the speculation,high-content anion doped anatase TiO2/C composites(9.82 at%for S in A-TiO2–x-S/C)are elaborately *** optimized A-TiO2–x-S/C anode exhibits extraordinarily high-rate capability with 209.6 mAh g-1at 5000 mA *** assembled sodium ion capacitors deliver an ultrahigh energy density of 150.1 Wh kg-1at a power density of 150 W kg-1when applied as anode *** work provides a new strategy to realize high content anion doping concentration,and enhances the charge transfer kinetics for TiO2,which delivers an efficient approach for the design of electrode materials with fast kinetic.

摘要：Sodium layered oxides generally suffer from deep-desodiation instability in P2 structure and sluggish kinetics in O3 *** will be great to design P2/O3 biphasic materials that bring the complementary merits of both ***,such exploration is hindered by the ambiguous mechanism of material ***,supported by theoretical simulations and various spectroscopies,we prove that P2/O3 biphasic structures essentially originate from the internal heterogeneity of cationic potential,which can be realized by constraining the temperature-driven ion diffusion during solid-state ***,P2/O3 biphasic Na_(0.7)Ni_(0.2)Cu_(0.1)Fe_(0.2)Mn_(0.5)O_(2)-δ with well-designed quaternary composition is successfully obtained,exhibiting much-improved rate capabilities(62 mAh g^(-1)at 2.4 A g^(-1)) and cycling stabilities(84%capacity retention after 500 cycles)than its single-phase ***,synchrotron-based diffraction and X-ray absorption spectroscopy are employed to unravel the underlying sodium-storage mechanism of the P2/O3 biphasic *** work presents new insights toward the rational design of advanced layered cathodes for sodium-ion batteries.

摘要：能源革命中的新范式对电化学储能技术提出了更高的要求,而储能材料是电化学储能技术发展的关键。近年来,高熵作为一种新兴的材料设计策略,极大地扩展了电化学储能材料设计空间,有望用于突破当前电化学储能材料综合性能瓶颈,为电化学储能技术发展提供新动力。重点介绍了高熵电化学储能材料在锂离子电池、钠离子电池以及超级电容器电极材料方面的研究进展;简述了高熵材料的基本概念,主要包括高熵的定义与相关效应。从高熵的视角,总结了相关效应对电化学储能材料结构特性及性能的影响规律。最后,总结了对未来高熵电化学储能材料发展所带来的新机遇与新挑战提出了个人理解。

摘要：基于显式波动有限元—极限平衡法,探讨了可靠度动力安全系数的可信度,研究了地震动峰值、频谱特性对岩质边坡安全系数的影响。研究结果表明,可靠度动力安全系数改变了以往稳定性评价指标与风险评价脱钩的做法,评价结果更为科学合理;地震动峰值基本不改变安全系数时程曲线的形状,但对安全系数的概率分布和标准差影响显著,并且与边坡安全系数呈负相关关系;地震动频谱特性对边坡可靠度动力安全系数的影响最大达到25%,不应忽视。

摘要：在水利工程建设施工中,填筑土料在碾压施工前均要做击实试验,以试验结果的最大干密度和最优含水率作为土料碾压质量控制的基本指标。有时在施工现场还要针对不同的土类进行抽样检验,保证其碾压控制指标的合理性。为能够快速处理击实试验结果数据,依据Excel提供的强大图表和内置函数功能,结合实际工程项目的土料击实试验,详细描述几种击实试验数据的处理方法及对比分析。