浅谈电子电工技术在电力系统中的应用

本文针对电子电工技术在电力系统中的作用进行了分析,同时为该技术的推广提出了相应的建议.     

浅谈计算机网络技术在电子信息工程中的应用

本文将围绕计算机网络技术与电子信息工程的概念与联系,针对计算机网络技术在电子信息工程中的具体应用展开全面论述.     

浅析计算机电子信息技术工程的管理和应用研究

新时期背景下,在社会经济快速发展过程中,实现计算机电子信息技术与社会各个领域之间的有机融合发展,最大程度地促进各个领域工作效率和水平的提升.当前计算机电子信息技术工程在应用和管理的过程中,还存在许多问题和不足,社会和各个领域对于计算机电子信息技术工程的应用提出新要求,这就需要全面分析计算机电子信息技术工程管理的价值,结...     

电子渠道用户发展现状浅析——以江苏省广电有线信息网络股份有限公司为例

通过对江苏省全省电子渠道用户的总量和地区分布,分析了电子渠道缴费用户的流失及消费情况,找出了目前电子渠道存在的一些问题,并提出相应的策略。     

Flexible electronic skin with high performance pressure sensing based on PVDF/rGO/BaTiO3 composite thin film

The wearable intelligent electronic product similar to electronic skin has a great application prospect. However, flexible electronic with high performance pressure sensing functions are still facing great challenges. In this paper, the highly sensitive flexible electronic skin (FES) based on the PVDF/rGO/BaTiO₃ composite thin film was fabricated using the near-field electrohydrodynamic direct-writing (NFEDW) method. The PVDF/rGO/BaTiO₃ composite solution was directly written on flexible substrate by the NFEDW method to fabricate FES with micro/nano fiber structure, which has the function of sensing pressure with high sensitivity and fast response. The surface morphology and microstructure were characterized by SEM, AFM, and optical microscope in detail. The fabricated FES has high sensitivity (59 kPa⁻¹) and faster response time (130 ms). FES has been successfully applied to the detection of human motion and subtle physiological signals. The experimental results show that FES has good stability and reliability. FES can recognize human motion, and it has a broad application prospect in the field of wearable devices.     

Organic Heterocyclic Strategy for Precisely Regulating Electronic State of Palladium Interface to Boost Alcohol Oxidation

Exploring highly-efficient palladium (Pd)-based electrocatalysts for the alcohol oxidation reaction (AOR) is crucial yet challenging for chemists due to the vague Pd interface with an uncontrollable electronic environment. Herein, an organic heterocyclic strategy is used for the first time to modulate the electronic state of Pd electrocatalysts by anchoring Pd nanoparticles to conjugated microporous polymers (CMPs) with varied S-, N-, O-, or S, N-heterocycles. Among these CMPs, the S, N-containing thiazole heterocyclic polymer SNC with Pd catalyst exhibits highly-efficient current densities of 1575.0 mA mg_Pd⁻¹ for methanol oxidation and 1071.0 mA mg_Pd⁻¹ for ethanol oxidation, which are among the highest performance in the heterocyclic modulated Pd systems and surpass the commercial Pd black catalyst. Detailed theory calculations suggest that although the furan (O-heterocycle) polymer OC has the strongest charge transfer (0.057 |e|) with the Pd cluster, the moderate electron transfer (0.041 |e|) of the Pd /SNC heterojunction with an S···N···Pd noncovalent interaction shows the best catalytic reaction kinetics. Moreover, the d-band of the Pd /SNC system is closer to the volcano vertex than its counterparts. These results indicate that appropriate electron transfer intensity regulation of Pd electronic state by well-defined heterocyclic structures may significantly improve AOR activity.     

Dramatic Tuning of the Topological Hall Effect in AxRhO2 (A = K,Rb, and Cs) Crystals by Electron Concentration or Cation

Topological Hall effect, being an unconventional anomalous Hall effect, is originated from the real-space Berry curvature caused by the nontrivial topological spin textures in materials. Manipulations of nontrivial magnetic structure and related topological Hall effect are very important for the study of the chiral magnet. Herein, it is experimentally observed that the significant topological Hall conductivity σ_xy in antiferromagnetic K_0.5RhO₂ can reach 3.5% of ν = 1 quantum conductivity below 20 K. Furthermore, by adjusting the concentration of K-cation different from 0.5 in K_xRhO₂ or substituting the K cations by Rb or Cs to form Rb_0.5RhO₂ or Cs_0.5RhO₂, it is observed that the topological Hall effect is much weakened or even disappeared. This evolution, verified by the theoretical calculations, is attributed to the unstable ground state of the non-coplanar spin structure in K_xRhO₂ (x = 0.4 and 0.6) and Cs_0.5RhO₂. The significantly tunable topological Hall effect in A_xRhO₂ makes it prospective on logical/sensor devices of spintronics.     

Modulating In-Plane Defective Density of Carbon Nanotubes by Graphitic Carbon Nitride Quantum Dots for Enhanced Triiodide Reduction

The catalytic performance of carbon nanotubes has still been hindered by the intrinsic and limited in-plane electrocatalytic active sites, with a focus on improving their catalytic activity by covalent modifications, which require the relatively high energy input to dissociate the in-plane atoms and create the active sites. Herein, an effective route is developed to modulate the in-plane defective density and electronic structure of multi-walled carbon nanotubes (MWCNTs) by ultra-small-sized g-C₃N₄ quantum dots (CNQDs) with abundant nitrogen species via π–π stacking. The non-covalent bonded CNQDs on MWCNTs endow them with abundant catalytic active sites on the basal plane, still inheriting the intrinsic and fast electron-transfer characteristics of MWCNTs. The optimized CNQDs/MWCNTs-4 heterogeneous catalyst exhibits an optimal photoelectric conversion efficiency of up to 8.30% in probing reaction for triiodide reduction, outperforming the Pt reference (7.86%). The thermodynamic calculations further reveal that the CNQDs integrated on MWCNTs are capable of reducing the reaction energy barrier (ΔG) of the rate-determining step from I₂ to I⁻ and adsorption state I^*. The present study provides an efficient and non-covalent strategy to construct excellent carbon-based catalysts with abundant active sites, which is also enlightening for the preparation and application of other carbon-based catalysts.     

氟化硼碳平面的第一性原理研究

基于第一性原理的理论计算,研究了不同氟化程度的BC3,BC5,BC7的稳定结构和电子特征,发现通过B原子替代C原子,F原子与平面结构的结合能力更强了,氟化的硼碳结构比氢化的硼碳结构更加稳定.研究发现:当只有C原子与F原子成键时,体系变成半导体,而当B原子与F原子成键时,即所有原子都与F原子成键,体系变成导体.通过不同程度的氟化,BC3发生半导体-金属的转变,BC5和BC7发生金属-半导体-金属的转变.理论分析表明,B原子的pz轨道对电学性质变化有较大影响.由于其丰富的电学特性,此类氟化硼碳平面在纳米电子器件领域中具有潜在应用,并且该结果对实验合成也有一定的指导意义.     

密度泛函理论研究ScnO(n=1—9)团簇的结构、稳定性与电子性质

采用基于密度泛函理论的BP86/CEP-121G （O原子采用6-311G^**基组）方法,对Sc_nO （n=1—9）团簇的几何结构、能量与稳定性、电子结构性质及其随团簇尺寸的变化趋势进行了研究.随着团簇原子个数的增加,O原子从位于Sc_n团簇结构的边缘转变为占据团簇的内部位置.O原子的掺入增加了Sc_n团簇的稳定性,使其能隙升高,并改变了其稳定性及电子结构性质随团簇尺寸变化的规律;含有偶数个Sc原子的氧化物团簇比其周围邻近的含有奇数个Sc原子的氧化物团簇具有相对较高的稳定性.Sc_nO团簇电离势的理论计算值与实验值符合得较好,而其电子亲和势呈现振荡交替上升的变化趋势;用最大化学硬度规律等方法表征了Sc_nO氧化物团簇的稳定性和电子结构性质. 关键词： nO团簇')" href="#">Sc_nO团簇 几何结构 电子性质 密度泛函理论