Atomically thin photoanode of InSe/graphene heterostructure

很多物理和化学过程都发生在固体电极与溶液的表界面处，因而表面处离子的吸附、聚集及其在表面的反应都对整个反应过程起到至关重要的作用。然而使用传统的固体电极通常表现出的是体相和表面的复合性质，使得单纯研究电极材料表面效应及表面离子的动力学还存在挑战。二维材料由于其具有单原子层的厚度，晶体中所有原子都处在表面，因而可以作为一种理想的模型体系来仅针对此类表面现象进行研究。课题组选择光电化学池（PEC）分解水反应中的决速步骤氧析出半反应（OER）以作为研究表面离子行为的探针反应。光电极选择同时具有高迁移率、匹配的能级结构以及被抑制的光生电子-空穴复合的单层的二维硒化铟（InSe）材料。并且在手套箱提供的惰性气氛中用单层石墨烯对InSe进行封装，保证了光电极测试条件下长时间的稳定性。该工作揭示了二维异质结表面性质与反应活性的内在联系，希望能为研究电极表面离子效应提供新的材料平台。后续通过选择具有合适表面性能的二维材料，并与传统光电极材料结合，有望发展新型的高性能光阳极材料。 这一研究工作的实验部分是在化学化工学院曹阳教授指导下完成，博士生郑海红、鲁艺珍与广东工业大学轻工化工学院叶凯航博士为论文的共同第一作者。理论计算部分在程俊教授的指导下，由博士生胡晋媛完成。Achieving high-efficiency photoelectrochemical water splitting requires a better understanding of ion kinetics, e.g., diffusion, adsorption and reactions, near the photoelectrode's surface. However, with macroscopic three-dimensional electrodes, it is often difficult to disentangle the contributions of surface effects to the total photocurrent from that of various factors in the bulk. Here, we report a photoanode made from a InSe crystal monolayer that is encapsulated with monolayer graphene to ensure high stability. We choose InSe among other photoresponsive two-dimensional (2D) materials because of its unique properties of high mobility and strongly suppressing electron–hole pair recombination. Using the atomically thin electrodes, we obtained a photocurrent with a density >10 mA cm−2 at 1.23 V versus reversible hydrogen electrode, which is several orders of magnitude greater than other 2D photoelectrodes. In addition to the outstanding characteristics of InSe, we attribute the enhanced photocurrent to the strong coupling between the hydroxide ions and photogenerated holes near the anode surface. As a result, a persistent current even after illumination ceased was also observed due to the presence of ions trapped holes with suppressed electron-hole recombination. Our results provide atomically thin materials as a platform for investigating ion kinetics at the electrode surface and shed light on developing nextgeneration photoelectrodes with high efficiency.The experimental work was supported by the National Key R&D Program of China (2018YFA0306900 and 2018YFA0209500), the National Natural Science Foundation of China (21872114), and China Postdoctoral Science Foundation (2020M682616). 该工作得到了国家重点研究计划（2018YFA0306900、2018YFA0209500），国家自然科学基金（21872114）、中国博士后科学基金（2020M682616）的支持

配网设备的检修和运行维护管理工作

配网设备能否有效的运行,影响着整个电网的的运行效率,甚至影响了电力传输的质量。随着社会科技技术的不断发展,国家的配网设备也越来越先进,更加智能和自动化,那么对配网的设备运行也有了更高的要求,然而实际上,在运行过程中,仍然有一部分的的配电网在检修和运行中存在一些不足的情况,本文对配网设备的检修和维护管理的的现状进行分析,分析如何提高对配网设备的检修管理效率提出了有效的策略,希望为后续的配网设备检修和维护工作提供参考依据。</jats:p

配网检修安全技术措施探讨

随着我国经济的不断增长推动了电力技术的发展,配电设备和线路的检修维护已经成为电网中昀主要的工作,通常的配网在检修过程中会存在着各种各样的安全问题,需要通过科学合理的技术对其进行检修和管理,然后对其检修措施加以控制,配网检修的安全管理也应该采取固定的操作规程和标准,这样才能够及时发现问题并选择合适的方式去检测。</jats:p

多功能集成微加热器空间站在轨标定实验研究

变重力池沸腾中国空间站问天实验舱变重力科学首批两项科学实验任务之一，用于研究不同重力条件下池沸腾传热性能与气泡动力学规律。作为自主研制的关键部件，多功能集成微加热器（Multi-Functional Integrated Micro-heater,MIM）采用微机电系统（MEMS）技术，在10 mm×10 mm×1 mm石英玻璃基板上加工出特定的金属铂薄膜，集成了气泡激发、温度测量和功率输入等功能，并采用COB封装技术形成独立器件。利用中国空间站在轨实验数据，以沸腾液池内液体温度的实测数据为基准，对多功能集成微加热器16路局部温度测点和主加热器的电阻-温度特性曲线进行了标定，并分析了多功能集成微加热器温度测量的不确定度。基于在轨标定结果，反演计算了变重力池沸腾空间站在轨实验中不同重力条件下的单相自然对流传热特性。研究结果表明，这些特性与经典关联式预测及同类实验数据相符，证实了在轨实验结果的可靠性

Preliminary design and test of attitude control system for lunar CubeSats

立方星是一种模块化的微小卫星，在科学探测与专业人才培养等方面具有重要意义。针对目前立方星任务逐渐从近地轨道向深空扩展的发展趋势，以立方星月球深空任务为背景，利用商业器件设计并实现了初步的立方星姿态控制系统，以及姿态控制系统所必需的结构、电源、计算机等立方星子系统，同时给出了姿态测试平台的设计方案及其硬件实现。在所搭建硬件平台上，通过测量飞轮控制器的阻尼系数，对控制模型进行参数辨识与标定，获得了与数值仿真一致的实物测试结果。针对姿态控制系统设计了PD控制律，并在控制实验中实现了至任意姿态角的机动控制。CubeSats are miniature functional satellites. The increasing interest in CubeSats has uncovered the potential for planetary missions. Besides, CubeSats is an excellent educational platform. The preliminary attitude control system is designed and the corresponding hardware is built using commercial products for a lunar mission employing a CubeSat constellation to provide positioning service for landers/rovers on the far side of the moon. At the same time, the basic frame and necessary subsystems including the structure, power and on-board computer subsystems, and the attitude experiment platform are constructed. Based on the hardware platform, the control modelis deeply understood through measuring damping coefficients by experiments. A PD control method is designed to control the attitude.The numerical and physical simulation results match well, and the CubeSat system achieves accurate attitude maneuver

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^