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Science China Materials 2017年第4期60卷 343-351页

作者： keyang yin College of Materials Science and Engineering Liaocheng University Liaocheng 252059 China State Key Laboratory of Solid Lubrication & Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China

Large-scale production of graphene and sub- sequent sample engineering is the key for fully-realizing the potential applications proposed to this intriguing two-dimensional nanomaterial. Herein, smart graphene dispersions with low defects and thermo-responsive properties can be obtained by liquid phase exfoliation of graphite using an alkylated Percec monodendron （3,4,5-trioctadecy- loxybenzaldehyde, 1） as the stabilizing reagent. By simply changing the temperature, the dispersed graphene and 1 can be detached, leading to the recovery of both components. Besides noncovalent wrapping, the stabilizing reagent 1 can be also covalently attached to graphene through [3＋2] cycloaddition. The covalently functionalized graphene sheets show improved dispersibility in organic solvents compared to the pristine graphene, which opens the door for their applications in various polymer matrixes. The strategy demonstrated here provides a new methodology to get smart graphene dispersions with multiple functions.

关键词： graphene thermo-responsive liquid phase exfoliation alkylated cycloaddition

A state of art review on time series forecasting with machine learning for environmental parameters in agricultural greenhouses

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Information Processing in Agriculture 2024年第2期11卷 143-162页

作者： Gedi Liu keyang Zhong Huilin Li Tao Chen Yang Wang National Innovation Center for Digital Fishery China Agricultural University100083 BeijingChina Key Laboratory of Smart Farming Technologies for Aquatic Animal and Livestock Ministry of Agriculture and Rural AffairsChina Agricultural University100083 BeijingChina Beijing Engineering and Technology Research Center for Internet of Things in Agriculture China Agricultural University100083 BeijingChina College of Information and Electrical Engineering China Agricultural University100083 BeijingChina Department of Chemical and Process Engineering University of SurreyGU27XH GuildfordUnited Kingdom

Agricultural greenhouse production has to require a stable and acceptable environment,it is therefore essential for future greenhouse production to obtain full and precisely internal dynamic environment *** modeling based on machine learning methods,e.g.,intelligent time series prediction modeling,is a popular and suitable way to solve the above *** this article,a systematic literature review on applying advanced time series models has been systematically conducted via a detailed analysis and evaluation of 61 pieces selected from 221 *** historical process of time series model application from the use of data and information strategies was first ***,the accuracy and generalization of the model from the selection of model parameters and time steps,providing a new perspective for model development in this field,were compared and ***,the systematic review results demonstrate that,compared with traditional models,deep neural networks could increase data structure mining capabilities and overall information simulation capabilities through innovative and effective structures,thereby it could also broaden the selection range of environmental parameters for agricultural facilities and achieve environmental prediction end-to-end optimization via intelligent time series model based on deep neural networks.

关键词： Horticultural greenhouse environment Time series algorithms Prediction Deep neural networks

Xanadu: The Golden Deserted City

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China Book International 2024年第3期 30-35页

作者： Tang keyang 不详

Visitors to Xanadu see a city in a Chinese style,with square walls and familiar street layouts,yet the interior is utterly desolate,flled with an unfamiliar"nature"to Chinese *** Calvino described Marco Polo or perhaps his imagined version of the city in Invisible Cities:"Dusk falls,and the air after the rain smells of elephants"。

关键词： Golden Desert walls

Flash nanocomplexation (FNC): A new microvolume mixing method for nanomedicine formulation

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Chinese Chemical Letters 2024年第10期35卷 39-52页

作者： keyang Li Yanan Wang Yatao Xu Guohua Shi Sixian Wei Xue Zhang Baomei Zhang Qiang Jia Huanhua Xu Liangmin Yu Jun Wu Zhiyu He Frontiers Science Center for Deep Ocean Multispheres and Earth Systems Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of Education/Sanya Oceanographic InstitutionOcean University of ChinaQingdao/Sanya 266100/572024China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266003China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Guangzhou City Polytechnic Guangzhou 510520China National Key Laboratory for the Modernization of Classical and Famous Prescriptions of Chinese Medicine Jiangxi University of Chinese MedicineNanchang330004China Division of Life Science The Hong Kong University of Science and TechnologyHong Kong SAR 999077China

The application of nanotechnologies in formulation has significantly promoted the development of modern medical and pharmacological science, especially for nanoparticle-based drug delivery, bioimaging, and theranostics. The advancement of engineering particle design and fabrication is largely supported by a better understanding of how their apparent characteristics(e.g., size and size distribution, surface morphology, colloidal stability, chemical composition) influence their in vivo biological performance, which raises an urgent need for practical nanoformulation methods. Based on turbulent flow mixing and the self-assembly of molecules in fluids, flash technologies emerged as effective bottom-up fabrication strategies for effective nanoformulation. Among the flash technology family, flash nanocomplexation(FNC) is considered a novel and promising candidate that can promote and optimize formulation processes in a precise spatiotemporal manner, thus obtaining excellent fabrication efficiency, reproducibility and expandability. This review presents an overview of recent advances in fabricating drug-delivery nanoparticles using FNC platforms. Firstly, brief introductions to the basic principles of FNC technology were carried out, followed by descriptions of turbulent microvolume mixers that have significantly promoted the efficiency of FNC-based fabrications. Applications of real formulation cases were then categorized according to the self-assembly-driven interactions(including electrostatic interaction, coordination interaction,hydrogen bonding and hydrophobic interaction) and discussed to reveal the progressiveness of fabricating nanoparticles and discuss how its flexibility will provide advances and replenish the philosophy of nanomedicine formulation. In the end, the commercial potential, current limitations, and prospects of FNC technology for nanoformulation will be summarized and discussed.

关键词： Nanoformulation Nanoparticles Self-assembly Flash nanocomplexation Kinetic control Drug delivery

烷基化液体碳点用于提高石蜡基基础油的摩擦学性能

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摩擦学学报 2020年第5期40卷 664-672页

作者：尹克样闫明明王新宇郝俊英李洪光中国科学院兰州化学物理研究所固体润滑国家重点实验室甘肃兰州730000 山东大学胶体与界面化学教育部重点实验室山东济南250100 中国科学院大学北京100049

以油胺为原料,通过在氯苯中简单加热回流,并经后续硅胶柱层析纯化,制备了烷基包覆、室温下呈液态的蓝光碳点.高分辨透射电子显微镜(HR-TEM)、红外光谱和荧光光谱证明了烷基化蓝光碳点的成功制备.差示扫描量热(DSC)证明了碳点的室温液体... 详细信息

以油胺为原料,通过在氯苯中简单加热回流,并经后续硅胶柱层析纯化,制备了烷基包覆、室温下呈液态的蓝光碳点.高分辨透射电子显微镜(HR-TEM)、红外光谱和荧光光谱证明了烷基化蓝光碳点的成功制备.差示扫描量热(DSC)证明了碳点的室温液体属性.将碳点添加到石蜡基基础油中,发现其与基础油具有良好的相容性,并且混合体系呈现出良好的长效稳定性.研究了碳点添加量对基础油减摩抗磨效果的影响.与纯石蜡基基础油相比,添加碳点能明显改善其摩擦学行为,当碳点添加质量分数为0.1%时,摩擦系数和磨损体积均有所减小;当碳点添加质量分数为1.0%时,摩擦系数达到最小.这是由于在摩擦过程中,摩擦副表面形成了1层碳膜和四氧化三铁,阻止了摩擦副间的直接接触.

关键词：烷基化碳点添加剂摩擦学性能油胺

木质素磺酸钠复合气凝胶滤嘴对卷烟气的净化性能

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高分子材料科学与工程 2024年第2期40卷 151-156页

作者：马贝贝张玲尹成斌吴科阳王远西南林业大学机械与交通学院云南昆明650224 云南中烟工业有限责任公司技术中心云南昆明650231

为探索替代传统醋酸纤维滤嘴的生物质材料和进一步净化卷烟气的有害成分,降低抽烟对人体健康的伤害,文中以木质素磺酸钠、k型卡拉胶为原料,采用溶胶-凝胶法和冷冻干燥法制备出不同配比的复合气凝胶,采用扫描电镜(SEM)、X射线衍射(XRD)... 详细信息

为探索替代传统醋酸纤维滤嘴的生物质材料和进一步净化卷烟气的有害成分,降低抽烟对人体健康的伤害,文中以木质素磺酸钠、k型卡拉胶为原料,采用溶胶-凝胶法和冷冻干燥法制备出不同配比的复合气凝胶,采用扫描电镜(SEM)、X射线衍射(XRD)、红外光谱(FT-IR)和热重分析(TG)等方法分别对所制备复合气凝胶的表面形貌、官能团结构、热稳定性等进行分析。同时制作醋酸纤维+复合气凝胶滤嘴,通过转盘吸烟机测试其对卷烟气有害气体的净化性能。SEM结果表明,表面形貌显示复合气凝胶具有丰富的微孔孔隙结构和粗糙表面的层状结构;FT-IR和XRD分析表明,卡拉胶的加入并没有改变木质素磺酸钠本身的官能团,卡拉胶与木质素磺酸钠通过物理作用相结合。烟气测试和TG分析结果说明,卷烟气有害成分净化性能随着木质素磺酸钠含量增加而变优,且其热分解温度高于卷烟气进入滤嘴中部时的温度,其在吸烟过程中不会发生热分解,故其为一种理想的卷烟滤嘴潜在材料。

关键词：木质素磺酸钠复合气凝胶卷烟气滤嘴净化性能

征管技术和征管意愿对纳税遵从度的影响效果——以二手房交易税收征管为例

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经济学（季刊） 2024年第3期24卷 810-823页

作者：李科杨吴璟毛捷对外经济贸易大学国际经济贸易学院北京市100029 清华大学建设管理系、恒隆房地产研究中心

本文以二手房交易为例,实证检验征管技术和征管意愿对纳税遵从度的影响。研究发现,在应用房地产评估技术提高税收征管能力后,二手房交易的逃税程度显著下降。然而,改进征管技术会导致住房市场萧条、制约地方政府获取土地出让收入。因此... 详细信息

本文以二手房交易为例,实证检验征管技术和征管意愿对纳税遵从度的影响。研究发现,在应用房地产评估技术提高税收征管能力后,二手房交易的逃税程度显著下降。然而,改进征管技术会导致住房市场萧条、制约地方政府获取土地出让收入。因此,地方政府的土地财政依赖度越高,政策效果越弱,意味着征管意愿相较于征管技术起到更为关键的作用。本文不仅丰富了税收征管和土地财政的相关文献,而且对深化税收征管改革提供了有益的政策启示。

关键词：税收征管土地财政房地产市场

哈萨克斯坦南图尔盖盆地Doshan斜坡带岩性油气藏储层预测方法

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岩性油气藏 2024年第4期36卷 1-11页

作者：何文渊陈可洋中国石油国际勘探开发有限公司北京100034 中国石油大庆油田有限责任公司勘探开发研究院黑龙江大庆163712

综合利用钻井、测井、地震等资料,分析了哈萨克斯坦南图尔盖盆地Doshan区块中部斜坡带沉积特征,并提出了一种岩性油气藏储层预测方法,识别出岩性圈闭,地震属性分析验证了储层预测结果的可靠性。研究结果表明:(1)哈萨克斯坦南图尔盖盆地D... 详细信息

综合利用钻井、测井、地震等资料,分析了哈萨克斯坦南图尔盖盆地Doshan区块中部斜坡带沉积特征,并提出了一种岩性油气藏储层预测方法,识别出岩性圈闭,地震属性分析验证了储层预测结果的可靠性。研究结果表明:(1)哈萨克斯坦南图尔盖盆地Doshan斜坡带中—下侏罗统沉积时构造活动强烈,发育少量断裂,以湖相沉积为主,可分为SQ4—SQ6共3个沉积期,分别对应埃巴林组(J_(1)ab)、多尚组(J_(2)ds)和卡拉甘塞组(J_(2)kr),SQ6时期发生大规模湖侵,扇三角洲呈裙带状展布在边缘断层一侧,半深湖范围扩大;三角洲前缘为岩性圈闭发育的有利相带。(2)储层预测方法为以井-震标定结果确定地层界线,以基于声波曲线重构的岩石物理分析校正井径的影响,以基于调谐厚度的正演模型分析识别砂体,以高分辨率岩性储层地震反演技术对单砂层进行识别。(3)研究区岩性圈闭主要分布于中—下侏罗统,发育于坡折控砂条件下的一系列构造带上。地震属性分析结果与沉积特征吻合度较高。(4)研究区中—下侏罗统的坡折位置发育一系列岩性圈闭,在高分辨率地震剖面上表现为强振幅、高阻抗特征,是勘探有利区。

关键词：斜坡带岩性圈闭储层预测圈闭识别正演模拟地震反演技术岩石物理声波曲线重构中—下侏罗统 Doshan区块南图尔盖盆地哈萨克斯坦

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中国制造产业链集聚的生产率效应

经济问题探索 2024年第4期 103-123页

作者：刘维林颜钶洋南开大学经济与社会发展研究院天津300071

发挥产业链集聚优势以提升中国制造业的全要素生产率是应对全球产业链重组和推进中国产业体系现代化的关键途径。本文利用2003—2015年中国工业企业数据库和《中国投入产出表》的数据,在专业化和多样化空间集聚的理论基础上,提出上下游... 详细信息

发挥产业链集聚优势以提升中国制造业的全要素生产率是应对全球产业链重组和推进中国产业体系现代化的关键途径。本文利用2003—2015年中国工业企业数据库和《中国投入产出表》的数据,在专业化和多样化空间集聚的理论基础上,提出上下游集聚影响全要素生产率的理论假说,构建了基于区位熵和投入产出关联的产业链集聚指标,并运用多种计量模型对理论假说进行检验。结果发现:产业链上游、下游空间集聚能够显著促进产业全要素生产率的提升,且下游空间集聚的作用大于上游空间集聚,该结论在一系列内生性和稳健性检验后依然成立。产业市场集中度发挥了中介机制作用,而固定资产占比下降能够强化产业链空间集聚对全要素生产率提高的促进作用。进一步分析表明,产业链空间集聚对全要素生产率的影响因产业内在发展特点和外部成长环境的不同而存在异质性。本文的研究从产业链集聚视角为推进中国制造业高质量发展和产业链供应链现代化提供了政策启示。

关键词：产业链集聚全要素生产率投入产出关联制造业

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基于《内经》《难经》的五输穴原理探微

中华中医药学刊 2024年第10期42卷 80-83页

作者：刘可扬樊旭辽宁中医药大学辽宁沈阳110847

五输穴的理论肇始于《灵枢》《素问》,《内经》提出了五输穴井、荥、输、经、合的名称和具体穴位,奠定了五输穴理论的基础,《难经》运用取象比类方法,结合十二经气的运行,进一步阐明其临床意义,至《针灸甲乙经》补充完善之。然而,关于... 详细信息

五输穴的理论肇始于《灵枢》《素问》,《内经》提出了五输穴井、荥、输、经、合的名称和具体穴位,奠定了五输穴理论的基础,《难经》运用取象比类方法,结合十二经气的运行,进一步阐明其临床意义,至《针灸甲乙经》补充完善之。然而,关于《内经》和《难经》的比较研究特别是从阴阳五行原理角度做比较的研究尚不完善。文章通过挖掘总结《内经》和《难经》中五输穴的自然属性,五输穴理论合自然阴阳之法度、应四时五行之变化,蕴含“生长化收藏”理论,即人与天地相参、四时相应,五输穴的五行属性阐明“生克制化承”,即五输穴内应阴阳五行、内调五脏六腑,阐释五输穴理论蕴含着天人相应原理、阴阳五行化合运动的机理和规律,并通过五输穴的阴阳五行配穴施用以指导针灸配穴实践。五输穴理论富有朴素自然的哲学思想,指导着古今针灸临床,据此处方配穴,创立了“应时取穴法”“补母泻子法”“泻南补北法”“泻荥补合法”等阴阳五行配穴法,颇具人文和自然科学内涵,彰显了中医智慧。

关键词：五输穴《内经》《难经》阴阳五行配穴法