Recently, lithium-ion capacitors (LICs) combining the complementary characteristics of both lithium-ion batteries (LIBs) and supercapacitors, have received exhaustive investigation to meet the increasing demands for clean energy. However, their commercial application has been limited by the mismatch of charge-storage capacity and electrode kinetics between the capacitor-type cathode and battery-type anode. Thus, developing a novel high-power insertion anode material is the key to realizing excellent energy and power densities for LICs. Here, 3D hierarchical Nb2O5 microspheres assembled by surface-nitrogenated nanowires have been synthesized through a unique anti-solvent precipitation-assisted solvothermal route accompanied by a nitrogenization treatment, which can be successfully used for advanced LICs configuration. Owing to the high aspect ratio of ultrathin nanowires, unique pore structures caused by nitridation, improved electronic conductivity, and favorable kinetic stemming from pseudocapacitive behavior, the resultant nitrogenated Nb2O5 microspheres can deliver a high capacity of 205.3mAhg(-1) with remarkable rate capability and long lifespan. When constructed into a new LIC device with peanut-shell derived carbon (PSC) cathode, an exceptionally high energy density of approximate to 83.5Whkg(-1) and a high power density of 10kWkg(-1) with prominent cycling stability are realized. Significantly, the simultaneous manipulation of superstructure design and surface nitrogenization in novel anode material provides new opportunities to boost the energy and power densities for hybrid-ion capacitors.

A new class of energy storage device called a quasi-solid-state Na-ion capacitor is developed based on two self-supported electrodes, using an Na-ion conducting gel polymer as the electrolyte.

通过二维数值模型,模拟了桩承式路堤中土拱效应的极限情况,分析了影响等沉面高度的因素,结果表明桩径和桩间距的变化是影响等沉面高度变化的最重要的两个因素,随着桩间距的增大或者桩径的减小,路堤填土中等沉面高度逐渐升高.

土力学具有实践性,系统性,难学性等特点.在教学过程中,可以通过(1)合理安排理论课时和实验课时,保证两者衔接的流畅性;(2)理清概念,加深理解;(3)构建的知识体系框架,让知识点由难变易等措施相互结合,发挥教师在教学中的引导作用,促进教学质量和教学效果的不断提高.

This paper analyzed the pile supported embankment plane soil arch stress reduction coefficient using two-dimensional numerical simu-lation, discussed the factors and variation law influence of reduction coefficient, the results showed that: the soil with high shear strength, the stress reduction coefficient was small, the soil arching effect outstanding, increased the soli fill height in a certain range, made the soil arching effect gradually formed, the stress reduction coefficient decreased, the soil arching effect gradually increased;the increase of pile diameter spac-ing or reduce of pile diameter, will increase the stress reduction coefficient, reduced the degree of soil arching effect.

According to researches ontests, the paper illustrates the test method steps for the water ratio of sand and silt of the rapidly drying method, undertakes the comparative analysis of the experimental data of the rapidly drying method and standard drying method, and points out it is feasibleto adopt the rapidly drying method to test the water ratio of soil and it also can promote the efficiency.

从《土木工程结构试验与检测》课程的教学现状出发,分析该课程教学改革的必要性。在此基础上,提出《土木工程结构试验与检测》教学应侧重于试验操作的实践教学环节,增强学生实际动手能力,有利于学生对《土木工程结构试验与检测》课程的理解,使学生能将所学内容有效用于实际工程。