摘要：Graphitic carbon nitride(g-C3N4)exhibits great mechanical as well as thermal characteristics,making it a valuable ma-terial for use in photoelectric conversion devices,an accelerator for synthesis of organic compounds,an electrolyte for fuel cell applications or power sources,and a hydrogen storage substance and a fluorescence *** is fabricated using dif-ferent methods,and there is a variety of morphologies and nanostructures such as zero to three dimensions that have been designed for different *** e are many reports about g-C3N4 in recent years,but a comprehensive review which covers nanostructure dimensions and their properties are *** review paper aims to give basic and comprehensive understanding of the photocatalytic and electrocatalytic usages of *** highlights the recent progress of g-C3N4 nano-structure designing by covering synthesis methods,dimensions,morphologies,applications and *** with the summary,we will also discuss the challenges and ***,investigators,and engineers looking at g-C3N4 nanostructures for a variety of applications might find our review paper to be a useful resource.

摘要：Anion exchange membrane fuel cells(AEMFCs)have attracted increasing research efforts in the past decade due to the advantageous nature of using Pt-free catalysts and cheap components that bring its cost closer to the target of US$30 kW-1[1].On the aspect of cathodic oxygen reduction reaction(ORR)。

摘要：Adsorption and photodegradation are promising approaches for removing organic *** this study,we combined these two processes by co-loading Fe-TiO2 and Fe2O3 quantum dots(QDs)on porous MCM-41,using a simple hydrolysis method.X-ray diffraction,high-resolution transmission electron microscopy,and X-ray photoelectron spectroscopy results indicated that Fe-TiO2 QDs are formed at low Fe precursor concentrations,while additional Fe2O3 QDs are formed at higher Fe precursor *** Fe2O3 and Fe-TiO2 QDs impart high adsorption capacity and high photoactivity to the porous MCM-41,***,their combination results in a synergic effect of the adsorption and *** highest-performing sample exhibits excellent performance in removing rose bengal from aqueous solution.

摘要：Z-scheme semiconductors are a promising class of photocatalysts for hydrogen *** this work,Z-scheme semiconductors composed of WO3-x quantum dots supported on TiO2（WO3-xQDS/TiO2） were fabricated by solvothermal and hydrogen-reduction *** by transmission electron microscopy and X-ray diffraction indicated that the amount and size of the WO3-x QDs could be tuned by modulating the addition of the W *** from X-ray photoelectron spectroscopy and photoluminescence spectroscopy suggested that the hydrogen reduction of the composite induced the formation of oxygen vacancy（W^5＋/Vo） defects in *** defects led to ohmic contact between WO3-x and TiO2,which altered the charge-transfer pathway from type Ⅱ heterojunction to Z-scheme,and maintained the highly reductive and oxidative ability of TiO2 and WO3-x,***,the Z-scheme sample showed 1.3-fold higher photoactivity than pure TiO2 in hydrogen *** results suggest that the formation of W^5＋/Vo defects at the interface is highly beneficial for the fabrication of Z-scheme photocatalysts.

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：Core discing often occurs in deep rocks under high-stress conditions and has been identified as an important characteristic for deep rock *** paper presents the formation mechanism of core discing ***,the interaction between diamond drill bits and rock was analyzed based on numerical modeling.A novel drill bit with an inner conical crown for the mitigation of core discing was designed and verified by simulation *** mitigation method was applied in the cavern B1 of CJPL-Ⅱand satisfactory results had been *** percentage of core discing had been obviously decreased from 67.8%when drilling with a rectangular crown drill bit,to 26.5%when an inner conical crown drill bit had been *** paper gives full insight into core discing characteristics and provides a new method for core discing mitigation;it will potentially contribute to stress measurement in deep rock engineering.

摘要：基于已有四开关组直线变压器驱动源(LTD)模块设计了对1Ω负载输出电流100 kA、脉冲上升时间小于60 ns的八开关组LTD模块,该模块采用轮辐式结构,由8个储能电容、气体开关、峰化电容器组并联向中心负载放电。在此基础上,给出了峰值功率100 GW、共10级的LTD装置的物理设计,该装置为同轴感应电压叠加型脉冲发生器。通过电路模拟和PIC模拟,对物理设计进行了检验,结果表明:10级八开关组100 kA LTD模块串联可使10Ω负载获得超过100 GW的功率输出,脉冲上升时间小于60 ns,所选取的结构和参数能保证电子流的磁绝缘,高压脉冲能有效传输到负载。

摘要：交直流同塔线路混合电场是决定导线对地高度和走廊宽度从而进行线路优化设计的重要因素。由于其地面横向分布是交流分量和直流分量共同作用的结果,因此其分布特性与两者的叠加和分布特点有着密切的联系。以两回330 k V、750 k V交流线路分别与单回?1100 k V直流线路同塔架设为例,分析了交流线路在不同布置方式与相序排列方式下地面混合电场的分布特性与规律,并据此计算了导线对地最小高度和走廊宽度。结果表明,根据混合电场交、直分量的横向衰减特性,从走廊中心向外,地面混合电场可分为交流分量占主导的"交流区",交、直流分量比例相当的"混合过渡区"以及直流分量占主导的"直流区",为保证地面交、直流分量"错峰"布置,两回交流线路应采用垂直或倒三角排布方式,此时导线最小对地高度按照交流线路单独运行时的情况设计即可。当交流为750 kV线路时,走廊宽度主要由交流电场控制;交流为330 kV线路时,走廊宽度则由交直流电场分量共同控制。最终推荐采用垂直排布的相序6和倒三角排布的相序4两种布置方式。

摘要：通量线法是求解直流线路离子流问题广泛应用的一种方法,其计算误差主要来自Deutsch假设。该文基于通量线(或称特征线)基本理论,提出一种高精度迭代特征线法。通过迭代计算,在每一步采用新的电场分布重新绘制特征线,逐步修正特征线的方向,从而使特征线法不再依赖于Deutsch假设。结果表明,与传统通量线法相比,迭代特征线方法在求解地面电场与离子、空间离子流分布、通量守恒性及电晕损耗方面均有明显改善。另外,还对两种传统通量线法边界条件的施加方式进行了误差比较与讨论。

摘要：随着接地网面积的不断增大,接地网计算工作量不断增大,水平分层土壤中接地网特性快速计算方法具有重要意义。采用复积分路径的方法实现了水平方向距离大于垂直方向距离情况下格林函数的计算,该方法将贝塞尔函数振荡因子转变成指数函数衰减因子;同时,对于有限区间的高振荡积分,采用了解析的矩函数方法进行计算,所得结果具有较高的计算精度和效率。数值算例结果表明了大型水平接地网接地参数计算中该方法的正确性和高效性。该方法不涉及积分核函数的复指数拟合过程,计算方案简洁,可应用于实际地网的设计和参数分析中。