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特高压输电线路中的智能维护技术分析

集成电路应用 2024年第2期41卷 230-231页

作者：刘骉郝宇史文军梁洪录冯骁国网冀北电力有限公司超高压分公司北京102488

阐述特高压输电线路智能化运行维护特点,能够满足输电线路安全性、电力工程信息化建设需求。分析技术要点,包括智能化实时监测、无人机线路巡检、智能化故障处理、卫星网络通信技术。

关键词：特高压输电线路实时监测

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计及激励型需求响应的有源配电网可靠性分析

南昌大学学报（工科版） 2024年第2期46卷 220-226页

作者：王飞王淳赖正海钟俊勋连泽刘彪南昌大学信息工程学院江西南昌330031

需求响应可以降低峰值负荷,改善配电网的可靠性。为分析激励型需求响应对有源配电网可靠性的影响,在分层电力市场结构下,以电网运营商、负荷聚合商和用户为主体建立了激励型需求响应模型,以负荷聚合商和用户收益最大为目标,在峰时段引... 详细信息

需求响应可以降低峰值负荷,改善配电网的可靠性。为分析激励型需求响应对有源配电网可靠性的影响,在分层电力市场结构下,以电网运营商、负荷聚合商和用户为主体建立了激励型需求响应模型,以负荷聚合商和用户收益最大为目标,在峰时段引导用户削减负荷,从而改善负荷曲线。建立储能系统充放电模型,采用蒙特卡罗模拟对含激励型需求响应的有源配电网进行可靠性计算,得出可靠性指标。算例分析结果表明:激励型需求响应以及光伏和储能的接入能有效提高配电网的可靠性。

关键词：激励型需求响应负荷削减有源配电网蒙特卡罗模拟可靠性

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ISSMGE虚拟大学引入地质工程专业留学生课堂辅助教学的可行性分析与实践研究

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中国地质教育 2024年第2期33卷 53-58页

作者：刘磊磊张鑫鑫曹函吴冬宇刘飚朱凌孙平贺有色金属成矿预测与地质环境监测教育部重点实验室湖南长沙410083 湖南有色资源与地质灾害探查湖南省重点实验室湖南长沙410083 中南大学地球科学与信息物理学院湖南长沙410083

线上教学是疫情防控期间的主要教学方式。对于留学生而言,传统的采用钉钉、腾讯课堂等线上教学方法存在着语言不同、互动性不足、对网络设备等相关软硬件配套设施要求较高和时差等问题,导致高质量地完成特殊时期的留学研究生教学任务面... 详细信息

线上教学是疫情防控期间的主要教学方式。对于留学生而言,传统的采用钉钉、腾讯课堂等线上教学方法存在着语言不同、互动性不足、对网络设备等相关软硬件配套设施要求较高和时差等问题,导致高质量地完成特殊时期的留学研究生教学任务面临较大的挑战。因此,本文提出了一种基于ISSMGE虚拟大学的课堂辅助教学体系,包括一种基础知识自行学习+重难点知识线上讲解的教学模式和过程性评价+总结性评价的多元化考核方式。以中南大学地质工程系留学研究生教学为例,结合相关具体课程对提出的教学体系进行实践教学。教学结果表明,所提出的教学新体系能够很好地克服传统线上教学方法的局限性,不仅提高了知识传授的效率和质量,也丰富了地质工程专业留学生教学内容,可为同类或相近专业特殊时期的教学工作提供有效参考。

关键词： ISSMGE虚拟大学地质工程留学生教育教学模式

Spatiotemporal variations in ecosystem services and their trade-offs and synergies against the background of the gully control and land consolidation project on the Loess Plateau,China

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Journal of Arid Land 2024年第1期16卷 131-145页

作者： WANG Jing WEI Yulu PENG biao liu Siqi LI Jianfeng Key Laboratory of Degraded and Unused Land Consolidation Engineering Ministry of Natural and ResourcesXi'an 710075China Institute of Land Engineering and Technology Shaanxi Provincial Land Engineering Construction Group Co.Ltd.Xi'an 710021China School of Human Settlements and Civil Engineering Xi'an Jiaotong UniversityXi'an 710049China Shaanxi Key Laboratory of Land Consolidation Xi'an 710064China

Studying the spatiotemporal variations in ecosystem services and their interrelationships on the Loess Plateau against the background of the gully control and land consolidation(GCLC)project has significant implications for ecological protection and quality development of the Yellow River ***,in this study,we took Yan'an City,Shaanxi Province of China,as the study area,selected four typical ecosystem services,including soil conservation service,water yield service,carbon storage service,and habitat quality service,and quantitatively evaluated the spatiotemporal variation characteristics and trade-offs and synergies of ecosystem services from 2010 to 2018 using the Integrated Valuation of Ecosystem Services and Trade-offs(InVEST)*** also analysed the relationship between the GCLC project and regional ecosystem service changes in various regions(including 1 city,2 districts,and 10 counties)of Yan'an City and proposed a coordinated development strategy between the GCLC project and the ecological *** results showed that,from 2010 to 2018,soil conservation service decreased by 7.76%,while the other three ecosystem services changed relatively little,with water yield service increasing by 0.56% and carbon storage service and habitat quality service decreasing by 0.16% and 0.14%,*** ecological environment of Yan'an City developed in a balanced way between 2010 and 2018,and the four ecosystem services showed synergistic relationships,among which the synergistic relationships between soil conservation service and water yield service and between carbon storage service and habitat quality service were *** GCLC project had a negative impact on the ecosystem services of Yan'an City,and the impact on carbon storage service was more *** study provides a theoretical basis for the scientific evaluation of the ecological benefits of the GCLC project and the realization of a win-win situation between food security and e

关键词： ecosystem services trade-offs and synergies gully control and land consolidation habitat quality Integrated Valuation of Ecosystem Services and Trade-offs(InVEST)model Loess Plateau

激光锡球软钎焊工艺参数对微焊点形态及润湿性的影响

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焊管 2024年第6期47卷 22-27页

作者：刘标李先芬柴旭东蔡楷蒙永民华鹏徐政合肥工业大学材料科学与工程学院合肥230009

为了探索激光锡球焊工艺参数对微焊点形貌的影响,采用激光锡球焊将直径0.25 mm的SAC305锡球在沉镍金焊盘上制备微焊点,并分析了微焊点的形貌及SAC305/焊盘界面的润湿性。结果表明,激光功率27 W、加热时间8 ms为最佳工艺参数,采用此工艺... 详细信息

为了探索激光锡球焊工艺参数对微焊点形貌的影响,采用激光锡球焊将直径0.25 mm的SAC305锡球在沉镍金焊盘上制备微焊点,并分析了微焊点的形貌及SAC305/焊盘界面的润湿性。结果表明,激光功率27 W、加热时间8 ms为最佳工艺参数,采用此工艺参数制备的微焊点均匀铺展在焊盘上,无缺陷;微焊点高度与激光功率、加热时间均呈负相关,微焊点铺展直径与激光功率、加热时间均呈正相关;SAC305/焊盘界面平整,喷出的SAC305锡球/镀Ni的Cu焊盘界面润湿性良好。

关键词：激光锡球焊 SAC305锡球激光功率加热时间焊点形态

Effect of the vortical structures on the hydrodynamic performance of a pitching hydrofoil

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Journal of Hydrodynamics 2024年第2期36卷 406-420页

作者： Rui Yuan Hui-yun Hao Qin Wu Yun-qing liu biao Huang School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China

The objective is to study the vortical structural behaviors of a transient pitching hydrofoil and their effects on the hydrodynamic performance. The pitching motion of the hydrofoil is set to pitch up with an almost constant rate from 5° to 15° and then back to 5°, with the Reynolds number 4.4×10^(5) and the frequency 2 Hz. The results show that the main coherent structures around the pitching hydrofoil include small-scale laminar separation bubble (LSB), large-scale second vortex (SV) and trailing edge vortex (TEV) which are all vortical. The relationship between the vortical structure and the lift is investigated with the finite-domain impulse theory. It indicates that the major part of the lift is contributed by the LSB, whereas the shedding and the formation of the SV and TEV cause the fluctuation of the lift. The proper orthogonal decomposition (POD) method is applied to capture the most energetic modes, revealing that the LSB mode occupies a large amount of energy in the flow field. The dynamic mode decomposition (DMD) method accurately extracts the dominant frequency and modal characteristics, with the first mode corresponding to the mean flow, the second mode corresponding to the LSB structure and the third and fourth modes corresponding to the vortex shedding.

关键词： Hydrodynamics vortical structures finite-domain impulse theory proper orthogonal decomposition(POD) dynamic mode decomposition(DMD) Pitching hydrofoil

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组氨酸选择性络合-浊点萃取除铝研究

稀土 2024年第3期45卷 19-29,I0003页

作者：高亮李金辉温耀儒龙光武高阳刘晋彪王瑞祥徐志峰江西理工大学材料冶金化学学部江西赣州341000 赣州市绿色冶金与过程强化工程技术研究中心江西赣州341000 自然资源部离子型稀土资源与环境重点实验室江西赣州341000 赣州澳克泰工具技术有限公司江西赣州341000 江西应用技术职业学院江西赣州341000

离子吸附型稀土矿浸出工艺中,稀土浸出的同时也会有大量的铝、铁等非稀土杂质随之浸出。选用组氨酸作为络合剂选择性络合铝离子,再加入非离子表面活性剂,利用浊点萃取法萃取分离稀土料液中的铝离子,考察溶液pH、反应温度、萃取平衡时间... 详细信息

离子吸附型稀土矿浸出工艺中,稀土浸出的同时也会有大量的铝、铁等非稀土杂质随之浸出。选用组氨酸作为络合剂选择性络合铝离子,再加入非离子表面活性剂,利用浊点萃取法萃取分离稀土料液中的铝离子,考察溶液pH、反应温度、萃取平衡时间、组氨酸的用量、组氨酸反应时间及Triton X-114的用量对除铝效果的影响,结果显示M_(组氨酸)∶M_(铝)=3∶1,将溶液pH调至4.5,恒温40℃,反应10 min后加入10 mL Triton X-114,平衡时间10 min,铝离子单次萃取率可达70.85%,稀土萃取率仅为4.45%。确定了组氨酸与铝离子的反应方程式,通过多次萃取研究,组氨酸络合萃取溶液中铝离子的最低萃取浓度c_(Al)=0.0539 g/L±0.003 g/L,分离系数β_((Al/RE))=52.19,说明利用组氨酸作为络合剂与浊点萃取方法相结合时,混合溶液中铝离子能有效与稀土离子分离。

关键词：稀土组氨酸选择性络合浊点萃取除铝

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微生物菌剂对猪粪-稻糠混合堆肥的影响

湖南农业科学 2024年第8期 41-45,50页

作者：陈薇高帅帅汪彬黄利红尹红梅刘标湖南省微生物研究院长沙410009

为了研究微生物菌剂应用于生猪粪污堆肥的实际效果,以筛选到的具有较强有机物分解能力和高温耐受性的2种菌株(枯草芽孢杆菌和酿酒酵母菌)为材料,设置不添加菌剂(CK)、添加菌剂1(T1)、添加菌剂2(T2)共3个处理,开展了堆肥试验。结果表明:... 详细信息

为了研究微生物菌剂应用于生猪粪污堆肥的实际效果,以筛选到的具有较强有机物分解能力和高温耐受性的2种菌株(枯草芽孢杆菌和酿酒酵母菌)为材料,设置不添加菌剂(CK)、添加菌剂1(T1)、添加菌剂2(T2)共3个处理,开展了堆肥试验。结果表明:添加2种微生物菌剂均有助于加速猪粪堆体升温,效果T2优于T1;添加2种微生物制剂可以降低猪粪堆肥的电导率,从而降低堆肥对土壤可能带来的盐渍化影响,效果T2优于T1;添加微生物制剂可以提高种子的发芽指数,减弱对植物的毒害,且T1与T2差距不大;添加微生物制剂可以减少堆肥氮损失,效果T2优于T1。因此,2种试验菌株可以提高堆肥效率,减少氮素损失,且有助于解决堆肥带来的环境问题。

关键词：菌剂堆肥生猪养殖氮循环氨挥发

Unveiling strain-enhanced moiréexciton localization in twisted van der Waals homostructures

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Nano Research 2024年第4期17卷 3245-3252页

作者： Henry Rui He Haihong Zheng biao Wu Shaofei Li Junnan Ding Zongwen liu Jian-Tao Wang Anlian Pan Yanping liu Institute of Quantum Physics School of PhysicsCentral South UniversityChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China Shenzhen Research Institute of Central South University Shenzhen 51800China

Moirésuperlattices,arising from the controlled twisting of van der Waals homostructures at specific angles,have emerged as a promising platform for quantum emission ***,the manipulation of strain provides a versatile strategy to finely adjust electronic band structures,enhance exciton luminescence efficiency,and establish a robust foundation for two-dimensional quantum light ***,the intricate interplay between strain and moirépotential remains partially ***,we introduce a meticulously designed fusion of strain engineering and the twisted 2L-WSe_(2)/2L-WSe_(2) homobilayers,resulting in the precise localization of moiré*** low-temperature photoluminescence spectroscopy,we unveil the emergence of highly localized moiré-enhanced emission,characterized by the presence of multiple distinct emission ***,our investigation demonstrates the effective regulation of moirépotential depths through strain engineering,with the potential depths of strained and unstrained regions differing by 91%.By combining both experimental and theoretical approaches,our study elucidates the complex relationship between strain and moirépotential,thereby opening avenues for generating strain-induced moiréexciton single-photon sources.

关键词： moirésuperlattices strain engineering moiréexcitons moirépotential