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Spatiotemporal characteristics and driving mechanisms of land use/land cover(LULC)changes in the Jinghe River Basin,China

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Journal of Arid Land 2024年第1期16卷 91-109页

作者： WANG Yinping JIANG Rengui yang mingxiang XIE Jiancang ZHAO Yong LI Fawen LU Xixi State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China Xi'an University of TechnologyXi'an 710048China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Department of Geography National University of SingaporeSingapore 117570Singapore

Understanding the trajectories and driving mechanisms behind land use/land cover(LULC)changes is essential for effective watershed planning and *** study quantified the net change,exchange,total change,and transfer rate of LULC in the Jinghe River Basin(JRB),China using LULC data from 2000 to *** trajectory analysis,knowledge maps,chord diagrams,and standard deviation ellipse method,we examined the spatiotemporal characteristics of LULC *** further established an index system encompassing natural factors(digital elevation model(DEM),slope,aspect,and curvature),socio-economic factors(gross domestic product(GDP)and population),and accessibility factors(distance from railways,distance from highways,distance from water,and distance from residents)to investigate the driving mechanisms of LULC changes using factor detector and interaction detector in the geographical detector(Geodetector).The key findings indicate that from 2000 to 2020,the JRB experienced significant LULC changes,particularly for farmland,forest,and *** the study period,LULC change trajectories were categorized into stable,early-stage,late-stage,repeated,and continuous change *** the stable change type,the late-stage change type predominated the LULC change trajectories,comprising 83.31% of the total change *** period 2010-2020 witnessed more active LULC changes compared to the period *** LULC changes exhibited a discrete spatial expansion trend during 2000-2020,predominantly extending from southeast to northwest of the *** driving factors on LULC changes included slope,GDP,and distance from *** interaction detection results imply either bilinear or nonlinear enhancement for any two driving factors impacting the LULC changes from 2000 to *** comprehensive understanding of the spatiotemporal characteristics and driving mechanisms of LULC changes offers valuable insights for the planning and sustainable management

关键词： land use/land cover(LULC)changes driving mechanisms trajectory analysis geographical detector(Geodetector) Grain for Green Project Jinghe River Basin

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考虑融雪及土壤冻融的新安江模型及其应用——以雅砻江上游径流模拟为例

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水科学进展 2024年第4期35卷 530-542页

作者：董宁澎王浩杨明祥张居嘉徐世琴中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京100038 Hydrology Agriculture and Land Observation LaboratoryDivision of Biological and Environmental Science and EngineeringKing Abdullah University of Science and TechnologyThuwal 23955-6900Kingdom of Saudi Arabia

寒区为中国大江大河的主要产流区,其径流预报精度直接影响下游水利工程调度和水资源科学管理。针对传统概念性水文模型较少考虑积雪融雪及土壤冻融过程对径流的叠加影响这一问题,以新安江模型为基础,以降水量和气温为驱动数据,提出了基... 详细信息

寒区为中国大江大河的主要产流区,其径流预报精度直接影响下游水利工程调度和水资源科学管理。针对传统概念性水文模型较少考虑积雪融雪及土壤冻融过程对径流的叠加影响这一问题,以新安江模型为基础,以降水量和气温为驱动数据,提出了基于“等效土壤温度”和“土壤冻融特征曲线”的概念性土壤冻融模块来刻画积雪融雪及土壤冻融共同影响下的流域产流过程,构建了考虑融雪产流和土壤冻融的新安江模型。以雅砻江甘孜水文站以上流域为典型研究区,开展了流域2017—2022年冰雪消融期逐小时的径流模拟分析。结果表明,相比于HBV模型,考虑融雪产流和土壤冻融的模型可以显著提升流域冰雪消融期的水文模拟精度,各年份消融期径流的纳什效率系数中位数由0.69提升至0.83,相关系数中位数由0.88上升至0.92。本研究所提出的考虑融雪及土壤冻融的新安江模型可以为寒区的水文业务预报提供科学支撑。

关键词：寒区融雪产流土壤冻融新安江模型水文预报

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AgCu系电接触材料研究进展

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贵金属 2024年第S1期45卷 1-6页

作者：杨铭湘陈永泰谢明宁德魁陈松杨有才昆明贵金属研究所昆明650106 云南贵金属实验室有限公司昆明650106

银铜系电接触材料作为银基电接触材料的一大重要门类在电接触材料行业中因其卓越的电导率、耐磨性、抗熔焊性和广泛应用而占据重要地位。本文对Ag CuNi、AgCuV、AgCuO合金系列以及Ag Cu/LSCO等银铜系电接触材料的性能特点、制备工艺和... 详细信息

银铜系电接触材料作为银基电接触材料的一大重要门类在电接触材料行业中因其卓越的电导率、耐磨性、抗熔焊性和广泛应用而占据重要地位。本文对Ag CuNi、AgCuV、AgCuO合金系列以及Ag Cu/LSCO等银铜系电接触材料的性能特点、制备工艺和研究现状进行了归纳和阐述。分析了银铜系电接触材料研究中存在的问题,并展望了发展趋势。

关键词：金属材料银铜系电接触材料制备工艺材料改性

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国外退役军人优待抚恤制度及对我国的启示

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社会保障研究 2024年第2期 89-100页

作者：薛惠元张永高杨明祥张潇涵武汉大学社会保障研究中心/武汉大学政治与公共管理学院湖北武汉430072

美国、英国和俄罗斯是世界上的军事大国,其退役军人优待抚恤制度发展较早,对我国具有一定借鉴价值。从抚恤金和补偿金、医疗教育和住房保障、权利救济和荣誉激励三个方面进行经验分析发现:美国、英国和俄罗斯在法律法规的基础之上建立... 详细信息

美国、英国和俄罗斯是世界上的军事大国,其退役军人优待抚恤制度发展较早,对我国具有一定借鉴价值。从抚恤金和补偿金、医疗教育和住房保障、权利救济和荣誉激励三个方面进行经验分析发现:美国、英国和俄罗斯在法律法规的基础之上建立具有精细化货币福利设计和差异化补偿特点的退役军人抚恤金和补偿金制度,并为退役军人提供广泛的医疗、教育和住房保障,还从立法、司法和行政三个方面保护退役军人的合法权利,通过建立荣誉奖励体系、设立纪念日和实施优待等来表彰和纪念退役军人;但由于三个国家的国情和政治体制不同,制度设计的特点和侧重亦有差异。鉴于此,应根据我国国情,进一步完善退役军人的抚恤金和补偿金制度,加强货币福利的精细化设计,健全多层次医疗保健体系,优化教育资助和住房保障体系,建立有效的权利救济机制,加大对退役军人的荣誉奖励和社会宣传力度。

关键词：退役军人优待抚恤制度比较

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AGV物流系统在工业生产与仓储场景中的实际应用与仿真分析

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现代科学仪器 2024年第5期41卷 275-280页

作者：陈军南天杨明祥唐占彪陈博国网甘肃省电力公司物资公司兰州甘肃730050 国网思极飞天(兰州)云数科技有限公司兰州甘肃730050

现代工业和仓储场景面临着日益复杂的供应链管理需求,然而缺少智能化物流方案提升管理效率。因此,研究设计一种全向行驶智能AGV物流系统,并对其进行仿真实验。实验结果表明,AGV物流系统在72小时内完成任务2104次,比原物流系统的1791次提... 详细信息

现代工业和仓储场景面临着日益复杂的供应链管理需求,然而缺少智能化物流方案提升管理效率。因此,研究设计一种全向行驶智能AGV物流系统,并对其进行仿真实验。实验结果表明,AGV物流系统在72小时内完成任务2104次,比原物流系统的1791次提升17.5%。AGV物流系统的平均任务完成率为96.08%,最高任务完成率达到99%,平均错误率为1.59%,最高错误率仅为3.3%。研究为AGV物流系统在物流行业中的应用提供了有效手段,对工业生产与仓储环境的可持续发展具有重要意义。

关键词： AGV 物流系统全向行驶仓储环境

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Magnetic and electrical transport study of the intrinsic magnetic topological insulator MnBi_(2)Te_(4)with Ge doping

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Frontiers of physics 2024年第3期19卷 51-59页

作者： Qingwang Bai mingxiang Xu School of Physics Southeast UniversityNanjing 211189China

As an intrinsic magnetic topological insulator with magnetic order and non-trivial topological structure,MnBi_(2)Te_(4)is an ideal material for studying exotic topological states such as quantum anomalous Hall effect and topological axion insulating ***,we carry out magnetic and electrical transport measurements on(Mn1–xGex)Bi_(2)Te_(4)(x=0,0.15,0.30,0.45,0.60,and 0.75)single *** is found that with increasing x,the dilution of magnetic moments gradually weakens the antiferromagnetic exchange ***,Ge doping reduces the critical field of ferromagnetic ordering,which may provide a possible way to implement the quantum anomalous Hall effect at lower magnetic *** transport measurements suggest that electrons are the dominant charge carriers,and the carrier density increases with the Ge doping ***,the Kondo effect is observed in the samples with x=0.45,0.60,and *** results suggest that doping germanium is a viable way to tune the magnetic and electrical transport properties of MnBi_(2)Te_(4),opening up the possibility of future applications in magnetic topological insulators.

关键词： MnBi_(2)Te_(4) intrinsic magnetic topological insulator transition points Kondo effect

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Design and simulation investigations on charge transport layers‑free in lead‑free three absorber layer all‑perovskite solar cells

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Frontiers of Optoelectronics 2024年第2期17卷 69-85页

作者： Guangdong Li mingxiang Xu Zhong Chen School of Physics Southeast UniversityNanjing 211189China

The multiple absorber layer perovskite solar cells(PSCs)with charge transport layers-free(CTLs-free)have drawn widespread research interest due to their simplified architecture and promising photoelectric *** the circumstances,the novel design of CTLs-free inversion PSCs with stable and nontoxic three absorber layers(triple Cs_(3)Bi_(2)I_(9),single MASnI_(3),double Cs_(2)TiBr_(6))as optical-harvester has been numerically simulated by utilizing wxAMPS simulation software and achieved high power conversion efficiency(PCE)of 14.8834%.This is owing to the innovative architecture of PSCs favors efficient transport and extraction of more holes and the slender band gap MASnI_(3)extends the absorption spectrum to the near-infrared periphery compared with the two absorber layers architecture of ***,the performance of the device with p-type-Cs_(3)Bi_(2)I_(9)/p-type-MASnI_(3)/n-type-Cs_(2)TiBr_(6)architecture is superior to the one with the p-type-Cs_(3)Bi_(2)I_(9)/ntype-MASnI_(3)/n-type-Cs_(2)TiBr_(6)architecture due to less carrier recombination and higher carrier life time inside the absorber *** simulation results reveal that Cs_(2)TiF_(6)double perovskite material stands out as the best ***,an excellent PCE of 21.4530%can be obtained with the thicker MASnI_(3)absorber layer thickness(0.4μm).Lastly,the highestperformance photovoltaic devices(28.6193%)can be created with the optimized perovskite doping density of around E15 cm^(3)(Cs_(3)Bi_(2)I_(9)),E18 cm^(3)(MASnI_(3)),and 1.5E19 cm^(3)(Cs_(2)TiBr_(6)).This work manifests that the proposed CTLs-free PSCs with multi-absorber layers shall be a relevant reference for forward applications in electro-optical and optoelectronic devices.

关键词： Multiple absorber layer PSCs CTLS-free·Inverted Narrow-band gap Simulation

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电力设备局部放电因素分析与实时监测系统优化设计

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粘接 2024年第5期51卷 189-192页

作者：李佳宣殷商莹杨明祥邹兰青贺皎国网物资有限公司北京100120 国网甘肃省电力公司物资事业部甘肃兰州730050

针对电力设备依靠人工定期巡检完成运维,存在人工劳动强度大、故障处理不及时、容易发生电网供电事故等问题,根据电力设备局部放电的原理,设计了电力设备局部放电在线监测系统。该系统结构简单,成本低、操作简单、需求数据量少,实时传... 详细信息

针对电力设备依靠人工定期巡检完成运维,存在人工劳动强度大、故障处理不及时、容易发生电网供电事故等问题,根据电力设备局部放电的原理,设计了电力设备局部放电在线监测系统。该系统结构简单,成本低、操作简单、需求数据量少,实时传输局部放电数据,对设备进行实时在线监测。通过逐次比较获取放电幅值数据,转换后得到放电相位,完成图谱绘制,分析电力设备绝缘材料损坏程度。通过测试,该监测系统运行稳定可靠,降低运维人员工作量,提升效率,有利于保障电力设备的正常安全运行,避免停电事故带来的损失,具有较好的实用价值。

关键词：电力设备局部放电实时监测安全运行

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Reasonable grazing may balance the conflict between grassland utilization and soil conservation in the semi-arid hilly areas, China

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Journal of Arid Land 2024年第8期16卷 1130-1146页

作者： SUN Hui ZHAO Yunge GAO Liqian XU mingxiang College of Forestry Northwest A&F UniversityYangling 712100China College of Soil and Water Conservation Science and Engineering Institute of Soil and Water ConservationNorthwest A&F UniversityYangling 712100China

Soil erosion caused by unsustainable grazing is a major driver of grassland ecosystem degradation in many semi-arid hilly areas in ***,grazing exclusion is considered as an effective method for solving this issue in such ***,some ecological and economic problems,such as slow grassland rejuvenation and limited economic conditions,have become obstacles for the sustainable utilization of grassland ***,we hypothesized that the conflict between grassland use and soil conservation may be balanced by a reasonable grazing *** this study,a two-year grazing fence experiment with five grazing intensity gradients was conducted in a typical grassland of the Loess Plateau in China to evaluate the responses of vegetation characteristics and soil and water losses to grazing *** five grazing intensity gradients were 2.2,3.0,4.2,6.7,and 16.7 goats/hm2,which were represented by G1-G5,respectively,and no grazing was used as *** results showed that a reasonable grazing intensity was conducive to the sustainable utilization of grassland *** biomass under G1-G4 grazing intensity significantly increased by 51.9%,42.1%,36.9%,and 36.7%,respectively,compared with *** addition,vegetation coverage increased by 19.6%under G1 grazing *** diversity showed a single peak trend with increasing grazing *** Shannon-Wiener diversity index under G1-G4 grazing intensities significantly increased by 22.8%,22.5%,13.3%,and 8.3%,respectively,compared with ***,grazing increased the risk of soil *** with control,runoff yields under G1-G5 grazing intensities increased by 1.4,2.6,2.8,4.3,and 3.9 times,respectively,and sediment yields under G1-G5 grazing intensities were 3.0,13.0,20.8,34.3,and 37.7 times greater,respectively,than those under *** result was mainly attributed to a visible decrease in litter biomass after grazing,which decreased by 50.5%,72.6%,79.0%,80.0%

关键词： fence-controlled grazing rehabilitated grassland vegetation community characteristics soil erosion sediment biocrusts Loess Plateau

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Enabling the transfer matrix method to model serial-parallel compliant mechanisms including curved flexure beams

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International Journal of Mechanical System Dynamics 2024年第1期4卷 48-62页

作者： mingxiang Ling Lei Yuan Tingjun Zeng Xianmin Zhang Robotics and Microsystems Center Soochow UniversitySoochowChina Guangdong Key Laboratory of Precision Equipment and Manufacturing Technology School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhouChina

Compliant mechanisms with curved flexure hinges/beams have potential advantages of small spaces,low stress levels,and flexible design parameters,which have attracted considerable attention in precision engineering,metamaterials,robotics,and so ***,serial-parallel configurations with curved flexure hinges/beams often lead to a complicated parametric ***,the transfer matrix method is enabled for analysis of both the kinetostatics and dynamics of general serial-parallel compliant mechanisms without deriving laborious formulas or combining other modeling ***,serial-parallel compliant mechanisms with curved flexure hinges/beams can be modeled in a straightforward manner based on a single transfer matrix of Timoshenko straight beams using a step-by-step *** and numerical validations on two customized XY nanopositioners comprised of straight and corrugated flexure units confirm the concise modeling process and high prediction accuracy of the presented *** conclusion,the present study provides an enhanced transfer matrix modeling approach to streamline the kinetostatic and dynamic analyses of general serial-parallel compliant mechanisms and beam structures,including curved flexure hinges and irregular-shaped rigid bodies.

关键词： compliant mechanisms curved flexure beams transfer matrix method nanopositioner rigid-body dynamics

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