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One-dimensional core/shell radial heterojunction with cascade type-II energyband alignment for enhanced broadband photodetection

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Light(Advanced Manufacturing) 2024年第3期5卷 130-141页

作者： Yi Ma Chunxiang xu Mengyang Wu Fumeng Zhang Xiaoxuan Wang Jianqi Dong Qiannan Cui Zengliang Shi State Key Laboratory of Digital Medical Engineering School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096JiangsuChina

Constructing a one-dimensional(1D)core/shell heterostructure is a rational and efficient way to integrate multiple functional materials into a single device,in which a distinct and reliable interface and suitable energy-band alignment play important roles in optoelectronic ***,using a typical magnetron sputtering system,we constructed a 1D ZnO/CdS/CdTe core/shell nanorod arrays radial heterojunction with a well-designed cascade type-II energy band alignment and improved the broadband photodetector(PD)*** well-formed shell layers compensated for the defect states on the ZnO surface and extended the photoresponse range from ultraviolet to visible and ***,reliable and distinct heterointerfaces with a cascade type-II energy band alignment can guarantee more stable carrier migration and reduce energy loss,promoting effective photogenerated charge carrier separation and resulting in an enhanced *** optimised 1D ZnO/CdS/CdTe core/shell heterojunction PD exhibited a fast photoresponse at 0 V bias with high responsivity and *** results provide an important reference for the rational design and controllable synthesis of multifunctional optoelectronic nanodevices.

关键词： Magnetron sputtering ZnO/CdS/CdTe core/shell Radial heterojunction Type-II energy band Broadband photodetector

不同预时效挤压态Mg−Gd−Y−Zn−Zr合金的再结晶行为和强化机制

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Transactions of Nonferrous Metals Society of China 2024年第2期34卷 480-503页

作者：徐健郑杰刘莞尔黄有旺闫钊鸣张治民王强薛勇中北大学材料科学与工程学院太原030051 北京宇航系统工程研究所北京100076 北京长征飞行器研究所北京100071

通过控制预时效时间制备3种不同状态的试样,研究不同预时效状态对挤压态Mg−9.5Gd−4Y−2.2Zn−0.5Zr(质量分数,%)合金的动态再结晶行为(DRX)和性能的影响。结果表明,欠时效挤压(UAE)样品的细晶体积分数为17.4%,而峰时效挤压(PAE)和过时效挤... 详细信息

通过控制预时效时间制备3种不同状态的试样,研究不同预时效状态对挤压态Mg−9.5Gd−4Y−2.2Zn−0.5Zr(质量分数,%)合金的动态再结晶行为(DRX)和性能的影响。结果表明,欠时效挤压(UAE)样品的细晶体积分数为17.4%,而峰时效挤压(PAE)和过时效挤压(OAE)样品的细晶体积分数分别达到89.7%和50.4%。在晶粒内部和晶界处分布的致密、细小的β颗粒相通过粒子激发形核机制显著提高了形核位点和位错密度。然而,致密针状γ'相抑制位错滑移,延迟DRX形核。PEA和OAE样品中细小晶粒的差异归因于原始颗粒相的数量和尺寸的不同,而其拉伸性能的差异归因于不同的显微组织。由于晶界强化和析出强化机制的贡献更大,PAE样品具有更优异的拉伸性能。

关键词： Mg−Gd−Y−Zn−Zr合金预时效处理再结晶行为强化机制粒子刺激形核

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会堂建筑大空间地板送风空调系统设计应用

建筑技术开发 2024年第8期51卷 140-142页

作者：周思佳许健曾曦贵州省建筑设计研究院有限责任公司贵阳550081

本研究通过对贵州省某报告厅项目设计过程的案例分析,阐述了地板送风空调系统应用于大型会堂建筑时的设计、施工及调试要点。其分析重点包括设计阶段的计算要点及系统配置和施工阶段的施工组织及系统调试两个部分。通过上述两个部分的... 详细信息

本研究通过对贵州省某报告厅项目设计过程的案例分析,阐述了地板送风空调系统应用于大型会堂建筑时的设计、施工及调试要点。其分析重点包括设计阶段的计算要点及系统配置和施工阶段的施工组织及系统调试两个部分。通过上述两个部分的应用分析总结了地板送风系统从设计、计算到交付使用全过程的重点与难点问题。

关键词：空调设计 UFAD 会堂建筑系统调试

Ovarian function in patients with systemic lupus erythematosus:Pathogenesis,drug application and prospective therapies

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World Journal of Experimental Medicine 2024年第2期14卷 29-34页

作者： Min xu Li-Li Tian Xiao-Liu Li Cheng Bao Hai-Wei Zhang Hong-Wei Chen Department of Rheumatology and Immunology Nanjing Drum Tower HospitalClinical College of Nanjing University of Chinese MedicineNanjing 210008Jiangsu ProvinceChina School of Life Science Nanjing Normal UniversityNanjing 210023Jiangsu ProvinceChina Department of Rheumatology and Immunology Nanjing Drum Tower HospitalNanjing 210008Jiangsu ProvinceChina Department of Rheumatology and Immunology Nanjing Pukou People’s HospitalNanjing 211800Jiangsu ProvinceChina Department of Rheumatology and Immunology Nanjing Drum Tower HospitalThe Affiliated Hospital of School of MedicineNanjing UniversityNanjing 210008Jiangsu ProvinceChina

Systemic lupus erythematosus(SLE)is a chronic autoimmune disease in which multiple organs are damaged that prevails in fertile ***,glucocorticoids and immunosuppressants are widely used to treat SLE ***,ovarian dysfunction occurs following the use of these drugs in women with ***,we summarize recent progress in terms of understanding ovarian injury,the effects of drug application and strategies to improve ovarian function in women with *** review could be helpful to precisely cure SLE in women desiring to have offspring.

关键词： Systemic lupus erythematosus Ovarian reserve Ovarian insufficiency Mesenchymal stem cells Fertility Autoimmune disease

新型电力系统下分布式光伏规模化并网运行关键技术探讨

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电网技术 2024年第1期48卷 184-196页

作者：栗峰丁杰周才期雍维桢黄越辉王建学许晓慧中国电力科学研究院有限公司北京市海淀区100192 国家电力调度控制中心北京市西城区100031 西安交通大学电气工程学院陕西省西安市710049

推进分布式光伏规模化并网是实现“碳达峰·碳中和”目标和构建新型电力系统的重要举措。基于此背景探讨面向新型电力系统的分布式光伏规模化并网运行关键技术。首先,归纳并阐述分布式光伏发展现状、并网方式及运行模式,分析大规模分布... 详细信息

推进分布式光伏规模化并网是实现“碳达峰·碳中和”目标和构建新型电力系统的重要举措。基于此背景探讨面向新型电力系统的分布式光伏规模化并网运行关键技术。首先,归纳并阐述分布式光伏发展现状、并网方式及运行模式,分析大规模分布式光伏接入给电网调度运行带来的挑战。其次,面对上述挑战,从信息集成、监测预测、平衡调度、聚合控制等视角提出系统调度运行关键技术,助力电网调控模式转型升级。然后,考虑实际工程需求,构思满足电网安全稳定运行的分布式光伏技术标准体系,以期促使分布式光伏“可观可测、可调可控、友好互动”。最后,调研并梳理国外分布式光伏规模化并网运行先进经验,并对我国分布式光伏并网协同探索、运行服务支持及市场交易参与等课题提出建议。

关键词：新型电力系统分布式光伏并网运行关键技术标准体系

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Wear-resistant Ag-MAX phase 3D interpenetrating-phase composites:Processing,structure,and properties

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Nano Research 2024年第2期17卷 806-819页

作者： Yu Guo Xi Xie Zengqian Liu Longchao Zhuo Jian Zhang Shaogang Wang Qiqiang Duan Qing Jia Dake xu Weihai xue Deli Duan Filippo Berto Zhefeng Zhang Rui Yang Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Chemical Engineering Materials and EnvironmentSapienza University of RomeRoma 00185Italy

Electrical contact materials are generally Ag-or Cu-based composites and play a critical role in ensuring the reliability and efficiency of electrical equipments and electronic *** MAX(M is an early transition metal,A is an element from III or IV main groups,and X is carbon or/and nitrogen)phase ceramics display a unique combination of properties and may serve as an ideal reinforcement phase for electrical contact *** biological materials evolved in nature generally exhibit three-dimensional(3D)interpenetrating-phase architectures,which may offer useful inspiration for the architectural design of electrical contact ***,a series of bi-continuous Ag-Ti_(3)siC_(2) MAX phase composites with high ceramic contents exceeding 50 vol.%and having micron-and ultrafine-scaled 3D interpenetrating-phase architectures,wherein both constituents were continuous and mutually interspersed,were exploited by pressureless infiltration of Ag melt into partially sintered Ti_(3)siC_(2) *** mechanical and electrical properties as well as the friction and wear performance of the composites were investigated and revealed to be closely dependent on the ceramic contents and characteristic structural *** composites exhibited a good combination of properties with high hardness over 2.3 GPa,high flexural strength exceeding 530 MPa,decent fracture toughness over 10 MPa·m^(1/2),and good wear resistance with low wear rate at an order of 10^(-5)mm^(3)/(N·m),which were much superior compared to the counterparts made by powder metallurgy *** particular,the hardness,electrical conductivity,strength,and fracture toughness of the composites demonstrated a simultaneous improvement as the structure was refined from micron-to ultrafine-scales at equivalent ceramic *** good combination of properties along with the facile processing route makes the Ag-Ti_(3)siC_(2)3D interpenetrating-phase composites appealing for electrical contact applicatio

关键词： three-dimensional(3D)interpenetrating-phase architecture Ag-MAX(M=early transition metal A=element from III or IV main groups and X=carbon or/and nitrogen)phase composites melt infiltration electrical contact materials mechanical

High cycle fatigue failure with radial cracks in gears of aero-engines

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Chinese Journal of Aeronautics 2020年第10期33卷 2620-2632页

作者： jie HONG Liming JIANG Xiru xu Yanhong MA School of Energy and Power Engineering Beihang UniversityBeijing 100083China Collaborative Innovation Center of Advanced Aero-Engine Beijing 100083China

The gears in aero-engines perform energy and motion transfer between the HighPressure Rotor(HPR)and ***,an occurred fault with radial cracks in the driven gear disk was diagnosed as High Cycle Fatigue(HCF)failure through necessary *** of fault tree and test signals indicated that the fracture was relevant to the swing vibration of the driven gear excited by the unbalance excitation on ***,a corresponding mechanism model was established,in which the gear meshing effect was considered,with lateral and swing vibration *** Governing Equations(GEs)and the Finite Element Model(FEM)were established and ***,the modal shapes,harmonic response,and transient response were analyzed,indicating that the swing vibration of the driven gear could be significantly excited by the unbalance on HPR,which induced the cracks in the driven gear disk to extend ***,influences of factors on the unbalance response were obtained,in which the unbalance response appeared local minimum points and maximum ***,1#and 2#bearing stiffness had rather significant influences on the *** it is efficient to modify them to achieve vibration control.

关键词： Cracks Fault analysis Geared rotors Influences of factors Response Unbalance

Multi-lump Kinetic Parameter Estimation and simulation of Trickle-bed Reactor for Ultra-deep Hydrodesulfurization of Diesel

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China Petroleum Processing & Petrochemical Technology 2024年第3期26卷 147-157页

作者： Huang Zhen Zhang xun Qiao Aijun xue Nan Liu Kaixiang xu Song Wang He siNOPEC Engineering Incorporation Co. Ltd.Beijing 100101China

A three-lumping Langmuir-Hinshelwood kinetic model was established based on the structures and reactivities of sulfur *** model described the ultra-deep hydrodesulfurization(UDHDS)performance of diesel,reducing sulfur content from 10000μg/g to less than 10μg/g,with experimental and predicted data showing a discrepancy of less than 10%.The diesel UDHDS reaction was simulated by combining the mass transfer,reaction kinetics model,and physical properties of *** results showed how the concentrations of H2S,hydrogen,and sulfur in the gas,liquid,and solid phases varied along the reactor ***,the study discussed the effects of each process parameter and impurity concentrations(H2S,basic nitrogen and,non-basic nitrogen)on diesel UDHDS.

关键词： diesel TBR ultra-deep HDS kinetic model simulation

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人工智能对劳动力市场极化的影响与对策

系统工程理论与实践 2024年第1期44卷 272-295页

作者：黄旭董志强宁波财经学院金融与信息学院宁波315175 华南师范大学经济与管理学院广州510004

当智能资本成本低于中等技能工人的成本,人工智能将替代中等技能工作岗位进而导致劳动力市场极化现象.本文构建多部门动态一般均衡模型,对比研究三种应对策略:1)提高中等技能工人劳动生产率, 2)中等技能工人下沉为低技能工人, 3)中等技... 详细信息

当智能资本成本低于中等技能工人的成本,人工智能将替代中等技能工作岗位进而导致劳动力市场极化现象.本文构建多部门动态一般均衡模型,对比研究三种应对策略:1)提高中等技能工人劳动生产率, 2)中等技能工人下沉为低技能工人, 3)中等技能工人转化为高技能工人.发现:三种对策均可以减轻工资极化现象,但中等技能工人转化为高技能工人可以提高总体劳动力技能水平,减少收入不平等现象.高(低)技能自动化将减少高(低)技能工人的工资和劳动收入份额,而创造高(低)指数任务将增加高(低)技能工人工资和劳动收入份额.政府增加新基建投资比例、减少教育投资比例可以提高社会总产出,但将加剧工资极化现象,政府增加教育投资比例、减少新基建投资比例将有利于缩小收入不平等,但经济增长效果不如投资新基建.

关键词：就业极化工资极化人工智能