分层介质中Love波的扩展W-W算法

应用精细积分法(PIM)和扩展Wittrick-Williams(W-W)算法求解横观各向同性分层半空间中的Love波问题.Love波对应于波数-频率域线性常微分方程的本征值问题.精细积分法是求解线性常微分方程两端边值问题和初值问题的高精度算法.利用本征值计数技术,扩展W-W算法可以不遗漏地找到所有本征值.因此,文中使用的方法可以得到计算机精度意义下的精确解.     

国产微机软件系统DDJ－W的近期进展

本文介绍有限元分析与优化设计微机软件系统ＤＵＪ－Ｗ近期开发出的先进的功能及其在工业领域的应用．     

平稳随机振动荷载识别的逆虚拟激励法（一）

本文将虚拟激励法作了逆向推广，从而用确定性方式求解了平稳随机振动的荷载谱识别问题。即已知部分响应的自谱与互谱，反求多点激励间的自谱与互谱。并通过计算机模拟，讨论了识别的精度及影响因素等问题。     

大跨悬索桥三维非平稳耦合抖振分析

基于Priestley(1967)演变功率谱模型，并采用Lin和Yang(1983)的建议，建立了脉动风速的非平稳功率谱模型。依据此模型，采用三维有限元法，建立了大跨桥梁非平稳耦合抖振运动方程。然后，将虚拟激励法和精细时程积分法相结合，建立了求解桥梁三维非平稳耦合抖振运动方程的快速算法。以某大跨悬索桥为例，分析了该桥的非平稳耦合抖振响应，并与平稳耦合抖振响应进行了比较。计算结果表明：随着脉动风速平稳部分持时的增大，非平稳抖振分析结果逐渐收敛于平稳抖振分析结果；但若脉动风速的平稳部分持时较短，非平稳抖振分析结果将低于平稳抖振分析结果。     

Sodium 1‐Naphthalenesulfonate‐Functionalized Reduced Graphene Oxide Stabilizes Silver Nanoparticles with Lower Cytotoxicity and Long‐Term Antibacterial Activity

Silver nanoparticles (AgNPs) are increasingly used in daily life for their antibacterial properties, but their low stability and high cytotoxicity hamper practical applications. In this work, sodium 1‐naphthalenesulfonate‐functionalized reduced graphene oxide (NA‐rGO) was used as a substrate for AgNPs to produce a AgNP‐NA‐rGO hybrid. This hybrid showed substantially higher antibacterial activity than polyvinyl pyrrolidone(PVP)‐stabilized AgNPs, and the AgNPs on NA‐rGO were more stable than the AgNPs on PVP, resulting in long‐term antibacterial effects. More importantly, this hybrid showed excellent water solubility and low cytotoxicity, suggesting the great potential application as sprayable reduced graphene oxide based antibacterial solutions.     

基于超表面透镜的偏振探测重构矩阵校准研究

偏振探测的重构矩阵校准影响着偏振态再现的准确性.针对基于超表面透镜的偏振探测系统的重构矩阵校准进行了详细的理论分析,对校准基准态的选取进行了讨论,提出采用条件数与等加权方差两个准则来选择校准基准态.通过对比仿真模拟和偏振探测还原实验,均证明了选取正八面体基准态进行校准能够得到更加精准的重构矩阵,且具备更好的抗噪声能力.     

Cathode Electrolyte Interphase (CEI) Endows Mo6S8 with Fast Interfacial Magnesium-Ion Transfer Kinetics

Magnesium (Mg) metal secondary batteries have attracted much attention for their high safety and high energy density characteristics. However, the significant issues of the cathode/electrolyte interphase (CEI) in Mg batteries are still being ignored. In this work, a significant CEI layer on the typical Mo₆S₈ cathode surface has been unprecedentedly constructed through the oxidation of the chloride-free magnesium tetrakis(hexafluoroisopropyloxy)borate (Mg[B(hfip)₄]₂) salt under a proper charge cut-off voltage condition. The CEI has been identified to contain B_xO_y effective species originating from the oxidation of [B(hfip)₄]⁻ anion. It is confirmed that the B_xO_y species is beneficial to the desolvation of solvated Mg²⁺, speeding up the interfacial Mg²⁺ transfer kinetics, thereby improving the Mg²⁺-storage capability of Mo₆S₈ host. The firstly reported CEI in Mg batteries will give deeper insights into the interface issues in multivalent electrochemical systems.     

Topological Design of Unprecedented Metal-Organic Frameworks Featuring Multiple Anion Functionalities and Hierarchical Porosity for Benchmark Acetylene Separation

Separation of acetylene (C₂H₂) from carbon dioxide (CO₂) or ethylene (C₂H₄) is industrially important but still challenging so far. Herein, we developed two novel robust metal organic frameworks AlFSIX-Cu-TPBDA (ZNU-8) with znv topology and SIFSIX-Cu-TPBDA (ZNU-9) with wly topology for efficient capture of C₂H₂ from CO₂ and C₂H₄. Both ZNU-8 and ZNU-9 feature multiple anion functionalities and hierarchical porosity. Notably, ZNU-9 with more anionic binding sites and three distinct cages displays both an extremely large C₂H₂ capacity (7.94 mmol/g) and a high C₂H₂/CO₂ (10.3) or C₂H₂/C₂H₄ (11.6) selectivity. The calculated capacity of C₂H₂ per anion (4.94 mol/mol at 1 bar) is the highest among all the anion pillared metal organic frameworks. Theoretical calculation indicated that the strong cooperative hydrogen bonds exist between acetylene and the pillared SiF₆²⁻ anions in the confined cavity, which is further confirmed by in situ IR spectra. The practical separation performance was explicitly demonstrated by dynamic breakthrough experiments with equimolar C₂H₂/CO₂ mixtures and 1/99 C₂H₂/C₂H₄ mixtures under various conditions with excellent recyclability and benchmark productivity of pure C₂H₂ (5.13 mmol/g) or C₂H₄ (48.57 mmol/g).     

负性光敏聚酰亚胺材料研究进展

芳香族聚酰亚胺具有优异的绝缘性、热稳定性、介电性能、机械性能以及化学稳定性,可在微电子工业中用作绝缘和保护材料。负性光敏聚酰亚胺具有芳香族聚酰亚胺的优点,同时也具有感光性,使得微电子加工过程中减少对光刻胶的依赖,简化图案形成的工艺,有力促进了生产效率。本文综述了负性光敏聚酰亚胺的发展,重点介绍聚酰亚胺光刻胶体系的原理及近期研究进展,并对负性光敏聚酰亚胺的发展给予展望。