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Strain engineering of 2D semiconductors and graphene:from strain fields to band-structure tuning and photonic applications

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Light(Science & Applications) 2020年第1期9卷 130-154页

作者： Zhiwei Peng Xiaolin Chen yulong fan David J.Srolovitz Dangyuan Lei Department of Materials Science and Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong 999077China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomHong Kong 999077China

Two-dimensional(2D)transition metal dichalcogenides(TMDCs)and graphene compose a new family of crystalline materials with atomic thicknesses and exotic mechanical,electronic,and optical *** to their inherent exceptional mechanical flexibility and strength,these 2D materials provide an ideal platform for strain engineering,enabling versatile modulation and significant enhancement of their optical *** instance,recent theoretical and experimental investigations have demonstrated flexible control over their electronic states via application of external strains,such as uniaxial strain and biaxial ***,many nondestructive optical measurement methods,typically including absorption,reflectance,photoluminescence,and Raman spectroscopies,can be readily exploited to quantitatively determine strain-engineered optical *** review begins with an introduction to the macroscopic theory of crystal elasticity and microscopic effective low-energy Hamiltonians coupled with strain fields,and then summarizes recent advances in strain-induced optical responses of 2D TMDCs and graphene,followed by the strain engineering *** concludes with exciting applications associated with strained 2D materials,discussions on existing open questions,and an outlook on this intriguing emerging field.

关键词： strain fields discussions

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碾盘山水库浸没问题研究

水利水电快报 2024年第4期45卷 59-64,93页

作者：张彬向雄范玉龙熊友平王涛湖北省水利水电规划勘测设计院有限公司湖北武汉430064 中国地质大学(武汉)环境学院湖北武汉430074

为了研究碾盘山水利水电枢纽工程水库浸没问题,为碾盘山水库蓄水后治理浸没灾害提供依据。采用解折法和数值模拟法,并参考碾盘山上游梯级丹江口水库浸没区判别方法及浸没程度评价和下游梯级兴隆水利枢纽库区两岸浸没治理,对水库产生浸... 详细信息

为了研究碾盘山水利水电枢纽工程水库浸没问题,为碾盘山水库蓄水后治理浸没灾害提供依据。采用解折法和数值模拟法,并参考碾盘山上游梯级丹江口水库浸没区判别方法及浸没程度评价和下游梯级兴隆水利枢纽库区两岸浸没治理,对水库产生浸没范围和影响程度进行综合判定。结果表明:通过解析法得到浸没区面积较数值模拟法大28.72 km^(2),验证了数值模拟法对水文地质参数、边界条件、降雨入渗补给量、侧向径流量、边界排泄量等参数敏感,尤其是地质体水文地质参数具有各向异性。

关键词：水库浸没数值法解析法碾盘山水利水电枢纽工程

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Effects of daily light integral on tomato(Solanum lycopersicon L.)grafting and quality in a controlled environment

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International Journal of Agricultural and Biological Engineering 2022年第6期15卷 44-50页

作者： Jinxiu Song yulong fan Xingqun Li Yuzhu Li Hanping Mao Zhiyu Zuo Zhirong Zou College of Agricultural Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationZhenjiang 212013JiangsuChina College of Horticulture Northwest A&F UniversityYangling 712100ShaanxiChina

As the source of energy and biological signals,light can influence the healing process of grafted seedlings by regulating the synthesis of the endogenous hormone,regeneration of wound-healing tissue,and connection of vascular tissue in grafted *** effect of daily light integral(DLI)on the healing process and seedling quality of tomato(Solanum lycopersicum L.)was analyzed in this study,with the comparison of grafted seedlings treated in dark for 7 d after *** results showed that the height increment of scion and rootstock,adhesion of graft union,stem flow,total chlorophyll content,and net photosynthesis rate increased gradually with increasing light intensity,and no longer increased significantly when the DLI was higher than 5.04 mol/m^(2)·*** contents of auxin(IAA)and gibberellin(GA)in tomato leaves increased and abscisic acid(ABA)decreased with the increase of ***,there was no significant difference between the treatments with DLI higher than 6.48 mol/m^(2)·*** the biomass and energy use efficiency(EUE)of grafted seedlings increased with DLI in a certain range and then *** biomass was the largest when DLI was 5.04 mol/m^(2)·***,EUE was highest when DLI was 7.46 mol/m^(2)·*** conclusion,a suitable DLI is beneficial to cultivate high-quality grafted tomato seedlings,and increasing DLI within a certain range can promote biomass accumulation,connection of vascular tissue,and endogenous hormone biosynthesis in tomato grafted seedlings during the healing *** lighting environment with DLI of 5.04 mol/m^(2)·d(light intensity of 100μmol/m^(2)·s and light time of 14 h/d)is recommended for the healing treatment in high-quality production,which also improves EUE during the healing period of tomato grafted seedlings.

关键词： stress resistance endogenous hormones stem flow energy use efficiency seedling index

Origin of the Yueguang gold deposit in Xinhua, Hunan Province, South China: insights from fl uid inclusion and hydrogen–oxygen stable isotope analysis

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Acta Geochimica 2024年第2期43卷 235-254页

作者： Hongxin fan Qiang Wang yulong Yang Yao Tang Hao Zou College of Earth Sciences Chengdu University of TechnologyChengdu 610059China College of Earth Sciences Jilin UniversityJilin 130061China

The Yueguang gold deposit is located in Fengjia,Xinhua County,Hunan Province,South *** represents a recently discovered small-scale gold deposit situated in the southwestern region of the Jiangnan Orogenic Belt,west of the Baimashan granitic *** order to discern the characteristics of the ore-formingﬂuids,the underlying mineralization processes,and establish a foundation for the origin of the Yueguang gold depositﬂuid inclusion micro-thermometry,as well as quartz hydrogen and oxygen isotope analysis,have been carried out on samples obtained from various stages of *** hydrothermal miner-alization stages within the Yueguang gold deposit can be categorized into three stages:(i)the barren,pre-ore quartz-pyrite stage(Stage Ⅰ),the quartz-pyrite-gold stage(Stage Ⅱ),and the post-ore quartz-carbonate stage(Stage Ⅲ),with the second stage being the main mineralization ***ﬂuid inclusions identiﬁed in samples from the main min-eralization stage can predominantly be described with the NaCl–H_(2)O and CO_(2)–NaCl–H_(2)O *** inclusions display homogenization temperatures ranging from 158.8 to 334.9℃,and theﬂuid salinity ranges from 0.3%to 4.0%(wt.%NaCl equiv.).Laser Raman spectroscopy analysis of individual inclusions further reveals the presence of gas-phases such as CO_(2),CH_(4),and N_(2).Isotopic analysis indicatesδ^(18)Oﬂuid values ranging from 3.95 to 6.7‰ and δDH_(2)O values ranging from-71.9 to-55.7‰.These results indi-cate that the ore-formingﬂuid of the Yueguang gold deposit belongs to metamorphic hydrothermalﬂuids of middle-low temperature and low *** the process of ore formation,gold is transported in the form of Au(HS)2-complexes,with gold deposition being driven byﬂuid ***,the Yueguang gold deposit is categorized as an orogenic gold deposit dominated by metamorphic hydrother-malﬂ*** may become a new target for gold exploration in the Baimashan region,central Hunan Province.

关键词： Hunan province Yueguang gold deposit Fluid inclusions Hydrogen–oxygen isotopes Laser Raman Fluid immiscibility Orogenic gold deposit

基于“HTML5”的质量过程控制APP的设计与实现

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现代信息科技 2024年第17期8卷 89-93,99页

作者：崔童谣李书明杨卫万然范玉龙红云红河烟草(集团)会泽卷烟厂云南曲靖654200

随着信息技术的发展,在“数字烟草”建设的大环境下,生产车间内部的质量问题反馈与追溯原来仅通过微信群或电话沟通,存在诸如网络安全问题、质量管控无法实现全流程监管、质量问题统计归档不便捷等问题。基于以上问题与可行的技术手段,... 详细信息

随着信息技术的发展,在“数字烟草”建设的大环境下,生产车间内部的质量问题反馈与追溯原来仅通过微信群或电话沟通,存在诸如网络安全问题、质量管控无法实现全流程监管、质量问题统计归档不便捷等问题。基于以上问题与可行的技术手段,开发基于“HTML5”的质量过程控制APP,用于提升车间内部质量管理水平,提高工作效率。质量过程控制APP采用HTML5开发模式,实现了质量问题预警、问题填报、统计分析功能。从上线运行情况来看,开发完成的质量过程控制APP能够解决目前的问题,并对质量管理工作形成闭环控制。

关键词： HTML5 质量过程控制 APP 质量管理

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厨余垃圾处理技术应用分析及综合评估

城市管理与科技 2024年第1期25卷 51-54页

作者：杨丽孙国芬许晓敏范玉龙郭禹佳深圳中环博宏环境技术有限公司深圳创腾环保技术有限公司

本文介绍了六种厨余垃圾处理技术路线,简要分析了不同技术处理原理、优势及不足等应用经验。在此基础上,根据层次分析法构建了不同技术指标评价体系,从技术、经济、环境及社会效益四个维度选取了关键指标,对技术进行量化排序。经归一化... 详细信息

本文介绍了六种厨余垃圾处理技术路线,简要分析了不同技术处理原理、优势及不足等应用经验。在此基础上,根据层次分析法构建了不同技术指标评价体系,从技术、经济、环境及社会效益四个维度选取了关键指标,对技术进行量化排序。经归一化计算得出不同技术综合排序为:厌氧制酸>厌氧产沼>生物养殖>三相分离>压榨脱水>小型处理机。各技术均有其应用优势及不足,不同区域应根据实际应用场景和适用条件因地制宜地选择合适的处理技术。

关键词：厨余垃圾层次分析法压榨脱水指标评价体系处理原理三相分离综合排序应用场景

京津冀旅游类乡村空间分布特征及影响因子分析

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平顶山学院学报 2024年第2期39卷 63-71页

作者：韩清文韩瑞玲杨可扬卢钖钖范玉龙河北师范大学家政学院河北石家庄050010 天津大学建筑学院天津300072 南阳理工学院建筑学院河南南阳473000

精准识别旅游类乡村的空间格局及影响因子对推进乡村旅游高质量发展具有重要意义.通过整合国家及省级层面公布的京津冀地区的多类型旅游类乡村的空间信息,采用核密度分析法、地理集中指数法和不均衡指数法分析其空间分布特征;选取自然... 详细信息

精准识别旅游类乡村的空间格局及影响因子对推进乡村旅游高质量发展具有重要意义.通过整合国家及省级层面公布的京津冀地区的多类型旅游类乡村的空间信息,采用核密度分析法、地理集中指数法和不均衡指数法分析其空间分布特征;选取自然地理、生态环境、社会人口、经济发展、交通运输、旅游发展6个维度19个影响因子,采用地理探测器与地理加权回归模型对其空间分布的影响因子进行分析.研究发现:京津冀地区旅游类乡村空间分布较为集中,形成了4个高密度区和3个中密度区;影响因子中森林面积的解释力最强,GDP总量最弱,交互作用结果均为增强;不同影响因子在空间分布上有明显差异,均为正反双向影响,其中道路密度和人均GDP的反向作用范围达到了80%以上.基于此提出京津冀地区乡村旅游空间布局发展的建议.

关键词：空间分布地理探测器地理加权回归

Ultra-compact on-chip metaline-based 1.3/1.6 μm wavelength demultiplexer

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Photonics Research 2019年第3期7卷 359-362页

作者： yulong fan XAVIER LE ROUX ANATOLE LUPU ANDRé DE LUSTRAC Centre de Nanosciences et de Nanotechnologies CNRS Université Paris-Sud Université Paris-Saclay Université Paris Lumières Univ Paris Nanterre

In this paper, we report an experimental demonstration of enabling technology exploiting resonant properties of plasmonic nanoparticles, for the realization of wavelength-sensitive ultra-minituarized(4 μm× 4 μm) optical metadevices. To this end, the example of a 1.3/1.6 μm wavelength demultiplexer is considered. Its technological implementation is based on the integration of gold cut-wire-based metalines on the top of a silicon-on-insulator waveguide. The plasmonic metalines modify locally the effective index of the Si waveguide and thus allow for the implementation of wavelength-dependent optical pathways. The 1.3/1.6 μm wavelength separation with extinction ratio between two demultiplexers' channels reaching up to 20 dB is experimentally demonstrated. The considered approach, which can be readily adapted to different types of material planar lightwave circuit platforms and nanoresonators, is suited for the implementation of a generic family of wavelength-sensitive guided-wave optical metadevices.

关键词： experimental optical lightwave is Its can dB be

High-fidelity mode scaling via topologicaloptimized on-chip metalens for compact photonic interconnection

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Light(Advanced Manufacturing) 2023年第3期4卷 222-232页

作者： Yingli Ha Lijun Wang Yinghui Guo Mingbo Pu fang Zou Xiong Li yulong fan Xiaoliang Ma Xiangang Luo State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China Research Center on Vector Optical Fields Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China School of Optoelectronics University of Chinese Academy of SciencesBeijing 100049China Tianfu Xinglong Lake Laboratory Chengdu 610299China

Photonic integrated circuits(PICs)have attracted significant interest in communication,computation,and biomedical ***,most rely on highly integrated PICs devices,which require a low-loss and high-integration guided wave *** to the various dimensions of different integrated photonic devices,their interconnections typically require waveguide *** a waveguide taper can overcome the width mismatch of different devices,its inherent tapering width typically results in a long length,which fundamentally limits the efficient interconnection between devices with a high scaling ratio over a short ***,we proposed a highly integrated on-chip metalens that enables optical interconnections between devices with high width-scaling ratios by embedding a free-form metasurface in a silicon-on-insulator *** special geometric features endow the designed metalens with high coupling efficiency and high *** device has a footprint of only 2.35μm in the longitudinal direction and numerical aperture of 2.03,enabling beam focusing and collimation of less than 10μm between devices with width-scaling ratio of *** the fundamental transverse electric field(TE0)mode,the relative transmittance is as high as 96%for forward incidence(from wide to narrow waveguides),whereas the metalens can realize wavefront shaping for backward incidence,which can be used in optical phase *** study provides new ideas for optical interconnect design and wavefront shaping in high-integration *** design approach has potential applications in directional radiators,LiDAR,on-chip optical information processing,analogue computing,and imaging.

关键词： On-chip metalens Inverse design Phase collimate Photonic integrated circuits