The relationship between the high-frequency performance of supercapacitors and the type of doped nitrogen in the carbon electrode

Nitrogen doping has been widely used to improve the performance of carbon electrodes in supercapacitors,particularly in terms of their high-frequency response.However,the charge storage and electrolyte ion response mechanisms of different nitrogen dopants at high frequencies are still unclear.In this study,melamine foam carbons with different configurations of surfacedoped N were formed by gradient carbonization,and the effects of the configurations on the high-frequency response behavior of the supercapacitors were analyzed.Using a combination of experiments and first-principle calculations,we found that pyrrolic N,characterized by a higher adsorption energy,increases the charge storage capacity of the electrode at high frequencies.On the other hand,graphitic N,with a lower adsorption energy,increases the speed of ion response.We propose the use of adsorption energy as a practical descriptor for electrode/electrolyte design in high-frequency applications,offering a more universal approach for improving the performance of N-doped carbon materials in supercapacitors.

两种交流干扰排流设施减缓效果及性能对比

详细介绍了钳位式排流技术和固态去耦合器技术的优缺点,并通过某管道交流干扰排流点,对两种排流器的交流干扰减缓效果及直流泄流性能进行对比研究,结果显示固态去耦合器具有更低的交流阻抗,交流减缓效果优于钳位式排流器。固态去耦合器在1.5V下直流泄流量小于0.1mA,对阴极保护系统系统较小。

基于蛙跳PSO-Richards模型的地表沉降动态预计

基于地表沉降变形规律和实际情况,分析预计地表沉降动态演化全过程的时间函数应具有的特征。针对采动区地表沉降Richards模型参数选取较为复杂的问题,引入蛙跳PSO算法思想,提出采动区地表沉降动态预计的蛙跳PSO-Richards模型。工程实例分析表明,蛙跳PSO-Richards模型符合理想时间函数特征,能够较好地预计采动区地表动态沉降全过程,具有较好的适用性。

基于DEM的河道坡度误差研究

坡度计算在水文、水土保持以及土方量计算领域均有重要而广泛的应用。本文在前人研究的基础上,着重分析各离散单元中的坡度误差结构,先消除无关因素再对相关因子逐个分析,揭示了二阶差分、三阶差分数模分析、曲面积分原理分析结论中存在的矛盾本质上是地形曲率的差异。以Sonic2024多波束长江局部河道水下地形测量数据、ArcGIS坡度计算为例,计算得出坡度极限误差约5度内的DEM栅格尺寸。