A highly alkaline-stable metal oxide@metal–organic framework composite for high-performance electrochemical energy storage

Most metal–organic frameworks (MOFs) hardly maintain their physical and chemical properties after exposure to alkaline aqueous solutions, thus precluding their use as potential electrode materials for electrochemical energy storage devices. Here, we present the design and synthesis of a highly alkaline-stable metal oxide@MOF composite, Co₃O₄ nanocube@Co-MOF (Co₃O₄@Co-MOF), via a controllable and facile one-pot hydrothermal method under highly alkaline conditions. The obtained composite possesses exceptional alkaline stability, retaining its original structure in 3.0 M KOH for at least 15 days. Benefitting from the exceptional alkaline stability, unique structure, and larger surface area, the Co₃O₄@Co-MOF composite shows a specific capacitance as high as 1020 F g⁻¹ at 0.5 A  g⁻¹ and a high cycling stability with only 3.3% decay after 5000 cycles at 5 A g⁻¹. The as-constructed solid-state flexible device exhibits a maximum energy density of 21.6 mWh cm⁻³.     

Electro-mechanically controlled assembly of reconfigurable 3D mesostructures and electronic devices based on dielectric elastomer platforms

The manufacture of 3D mesostructures is receiving rapidly increasing attention, because of the fundamental significance and practical applications across wide-ranging areas. The recently developed approach of buckling-guided assembly allows deterministic formation of complex 3D mesostructures in a broad set of functional materials, with feature sizes spanning nanoscale to centimeter-scale. Previous studies mostly exploited mechanically controlled assembly platforms using elastomer substrates, which limits the capabilities to achieve on-demand local assembly, and to reshape assembled mesostructures into distinct 3D configurations. This work introduces a set of design concepts and assembly strategies to utilize dielectric elastomer actuators as powerful platforms for the electro-mechanically controlled 3D assembly. Capabilities of sequential, local loading with desired strain distributions allow access to precisely tailored 3D mesostructures that can be reshaped into distinct geometries, as demonstrated by experimental and theoretical studies of ∼30 examples. A reconfigurable inductive–capacitive radio-frequency circuit consisting of morphable 3D capacitors serves as an application example.     

结构权力及其在作者影响力评价中的应用

[目的/意义]旨在给出一种基于结构权力(简称SP)的作者学术影响力评价指标.[方法/过程]以情报学领域的作者评价为例,根据作者发文量选定样本作者,以文献耦合为基础构建作者关系网络,计算作者的SP指数获得其排名,并与作者在耦合网络中的度中心性、接近中心性、中介中心性进行对比.[结果/结论]SP指数综合了SNA方法中度中心...     

在体育教学过程中如何渗透心理健康教育

通过对体育教学方面开展的心理健康教育问题进行了探讨,就如今高职生的心理状况,阐述了高职院校体育教学对学生心理教育的特殊作用,并提出在体育教学过程中渗透心理健康教育的方法与途径。     

当前我国农村中小学布局调整的问题、原因与对策

农村义务教育的改革与发展直接关系到“三农”问题的解决与农村地区的发展。农村中小学布局调整是我国近年优化农村教育资源配置,促进农村义务教育改革与发展的一项重要政策。然而,当前部分地区在对该项政策的理解与推行上凸显不少问题。本文在深入分析当前我国农村中小学布局调整政策的推行现状、部分地区调整失当所引发的严重问题及其原因的基础上,提出了稳步推进布局调整进程的对策建议。     

高校图书馆知识服务对策研究

知识服务是以满足读者需求为中心,围绕知识增值与创新的专业化、个性化和综合集成的服务。高校图书馆实施知识服务,必须拥有丰富的知识源、优秀的馆员和先进的技术,才能更好地为教学和科研提供高效、优质的服务。     

中文图书在线采选与传统采选模式的比较分析

本文通过对中文图书在线采选模式和传统采选模式的特点比较分析,提出了在线采选存在的问题及解决问题的方法。     

东汉裴岑纪功碑及其拓本

陕西省岐山县博物馆藏有《汉敦煌太守裴岑纪功碑》拓本一件，系民国年间岐山名士孟继圣先生旧藏，建国后捐献于岐山博物馆。拓本装裱成挂轴形式，纸本，蓝绫镶边，纵210厘米，横69厘米。轴端有“汉敦煌太守裴岑纪功碑”隶书题签。拓本为深蓝色。碑文6行，每行10字。文曰：“惟汉永和二年八月，敦煌太守云中裴岑（cén）将郡兵三千人，     

篮球位置技术剖析

篮球位置技术是比基本技术更适合比赛的专门技术，是基本技术的发展、转化、升华和再组合。重视并加强位置技术训练，对加速运动员的成长过程和培养高水平的运动员必将产生深远影响。