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Stable hydrogen-bonded organic frameworks and their photo-and electro-responses

Nano Research 2024年第8期17卷 7675-7699页

作者： Ying Hou Xin-Song Huang Sheng-Hao Gong Chen liu Yangyang liu Tian-fu liu State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry and Biochemistry California State UniversityLos AngelesCalifornia 90032USA College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China

Hydrogen-bonded organic frameworks(HOFs)are a recent class of porous materials that have garnered considerable research interest owing to their distinctive *** can be constructed through judicious selection of H-bonding motifs,which are further enforced by other weak intermolecular interactions such asπ–πstacking,van der Waals forces,and framework *** advantage of these interactions,we can expand the functional field of HOFs by introducing active ***,researchers have made substantial advancements in using HOFs for chemical sensing,catalysis,proton conduction,biological applications,and *** low bonding energy of H-bonds allows for precise control over the concentration of ligands in solvents,forming diverse HOF *** varied structures offer significant advantages for producing HOFs with photo-responsive and electro-responsive ***,the presence of H-bonds in HOFs results in their inherent lower stability compared to metal-organic frameworks(MOFs)and covalent-organic frameworks(COFs)formed via coordination and covalent bonds,*** a result,the pursuit of stable and innovative HOF materials with novel functional sites remains an ongoing *** review provides an overview of recent research progress in the development of new strategies for stable HOF synthesis and applications of HOFs with stimuli-responsive *** first classified all synthetic methods reported to date and discussed the stable HOFs synthesized,as well as their unique properties and *** addition,we summarized the applications of HOFs utilizing their synergistic responses to external stimuli,including photo,electrical,pressure,and chemical *** systematically reviewed stable HOF synthesis and applications,which may lead to a deeper understanding of the structure–activity relationship for these materials and guide future HOF design.

关键词： stable hydrogen-bonded organic frameworks(HOFs) photo-response electro-response photoelectric synergistic response

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Incorporating Lasso Regression to Physics-Informed Neural Network for Inverse PDE Problem

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 385-399页

作者： Meng Ma liu fu Xu Guo Zhi Zhai National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong UniversityXi’an710049China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049China Department of Electrical and Computer Engineering University of Massachusetts LowellLowellMA 01854USA

Partial Differential Equation(PDE)is among the most fundamental tools employed to model dynamic *** PDE modeling methods are typically derived from established knowledge and known phenomena,which are time-consuming and ***,discovering governing PDEs from collected actual data via Physics Informed Neural Networks(PINNs)provides a more efficient way to analyze fresh dynamic systems and establish *** study proposes Sequentially Threshold Least Squares-Lasso(STLasso),a module constructed by incorporating Lasso regression into the Sequentially Threshold Least Squares(STLS)algorithm,which can complete sparse regression of PDE coefficients with the constraints of l0 *** further introduces PINN-STLasso,a physics informed neural network combined with Lasso sparse regression,able to find underlying PDEs from data with reduced data requirements and better *** addition,this research conducts experiments on canonical inverse PDE problems and compares the results to several recent *** results demonstrated that the proposed PINN-STLasso outperforms other methods,achieving lower error rates even with less data.

关键词： Physics-informed neural network inverse partial differential equation Lasso regression scientific machine learning

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Limited Sea Surface Temperature Cooling Due to the Barrier Layer Promoting Super Typhoon Mangkhut (2018)

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ADVANCES IN ATMOSPHERIC SCIENCES 2024年第11期41卷 2156-2172页

作者： Wang, Huipeng Li, Jiagen Song, Junqiang Sun, Liang liu, fu Zhang, Han Ren, Kaijun Wang, Huizan Wang, Chunming Zhang, Jinrong Leng, Hongze Natl Univ Def Technol Coll Meteorol & Oceanog Changsha 410073 Peoples R China Univ Sci & Technol China Sch Earth & Space Sci Hefei 230000 Peoples R China Minist Nat Resources Inst Oceanog 2 State Key Lab Satellite Ocean Environm Dynam Hangzhou 310012 Peoples R China Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai 519082 Peoples R China

This study investigates the impact of the salinity barrier layer (BL) on the upper ocean response to Super Typhoon Mangkhut (2018) in the western North Pacific. After the passage of Mangkhut, a noticeable increase (similar to 0.6 psu) in sea surface salinity and a weak decrease (< 1 degrees C) in sea surface temperature (SST) were observed on the right side of the typhoon track. Mangkhut-induced SST change can be divided into the three stages, corresponding to the variations in BL thickness and SST before, during, and after the passage of Mangkhut. During the pre-typhoon stage, SST slightly warmed due to the entrainment of BL warm water, which suppressed the cooling induced by surface heat fluxes and horizontal advection. During the forced stage, SST cooling was controlled by entrainment, and the preexisting BL reduced the total cooling by 0.89 degrees C d(-1), thus significantly weakening the overall SST cooling induced by Mangkhut. During the relaxation stage, the SST cooling was primarily caused by the entrainment. Our results indicate that a preexisting BL can limit typhoon-induced SST cooling by suppressing the entrainment of cold thermocline water, which contributed to Mangkhut becoming the strongest typhoon in 2018.

关键词： sea surface cooling mixed-layer depth barrier layer typhoon UPPER-OCEAN RESPONSE TROPICAL CYCLONES INTENSITY ATMOSPHERE IMPACT AMAZON EDDY

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Experimental study on photodegradation and leaching of typical pesticides in greenhouse soil from Shouguang, Shandong Province, East China

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Ecological Processes 2024年第2期 32-47页

作者： Li-Ting Hua Rui-Lin Wu Cun-Lu Li Chao-Nan Wang Yi-Long Li fu-liu Xu MOE Laboratory for Earth Surface Processes College of Urban and Envi-ronmental Sciences Peking University Department of Ecology and Environment of Shanxi Province

Background Pesticide use contributes to national food security. The dissipation pathways and degradation mecha-nisms of pesticides have been widely studied and pesticide residues have remained a focus of public concern. How-ever, studies on the migration and transformation behaviors of pesticide residues in real-world greenhouse soils are insufficient. Therefore, in this study, we collected greenhouse soil from Shouguang, Shandong Province, and investi-gated the photodegradation and leaching of 17 common pesticides, which leave residues in the soil and are the most frequently used pesticides in Shouguang. The environmental behavior of pesticides in greenhouse soils will provide new information on pesticide residues in the real environment and provide a scientific basis for the prevention and control of pesticide pollution in greenhouse *** The photodegradation of trifloxystrobin followed a first-order kinetic equation, whereas those of emamec-tin benzoate, chlorantraniliprole, buprofezin, difenoconazole, pyraclostrobin, boscalid, tebuconazole, isoprothiolane, metalaxyl, and oxadixyl followed second-order kinetics. The half-lives of 17 pesticides under light and dark conditions ranged from 2.5–104(mean: 36.2) and 2.6–110(mean: 31.4) days, respectively. The half-lives of emamectin benzoate, pyraclostrobin, and metalaxyl in the light were 86.6%, 68.5%, and 94.5% of their half-lives in the dark, respectively. Chlorantraniliprole, metalaxyl, nitenpyram, diethofencarb, acetamiprid, carbendazim, and oxadixyl were leached to ≥ 90% in aqueous solution. Six pesticides, avermectin B1A, emamectin benzoate, trifloxystrobin, difenoconazole, pyraclostrobin, and buprofezin, were difficult to leach from aqueous *** The degradation rate of some pesticides was higher in the light environment than in the dark. The leaching potential of the leachable pesticides was nitenpyram ? metalaxyl > acetamiprid > carbendazim > diethofen-carb ≈ chlorantraniliprole > iso

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Limited Sea Surface Temperature Cooling Due to the Barrier Layer Promoting Super Typhoon Mangkhut(2018)

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Advances in Atmospheric Sciences 2024年第11期 2156-2172页

作者： Huipeng WANG Jiagen LI Junqiang SONG Liang SUN fu liu Han ZHANG Kaijun REN Huizan WANG Chunming WANG Jinrong ZHANG Hongze LENG College of Meteorology and Oceanography National University of Defense Technology School of Earth and Space Sciences University of Science and Technology of China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural Resources Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)

This study investigates the impact of the salinity barrier layer(BL) on the upper ocean response to Super Typhoon Mangkhut(2018) in the western North Pacific. After the passage of Mangkhut, a noticeable increase(～0.6 psu) in sea surface salinity and a weak decrease(< 1°C) in sea surface temperature(SST) were observed on the right side of the typhoon track. Mangkhut-induced SST change can be divided into the three stages, corresponding to the variations in BL thickness and SST before, during, and after the passage of Mangkhut. During the pre-typhoon stage, SST slightly warmed due to the entrainment of BL warm water, which suppressed the cooling induced by surface heat fluxes and horizontal advection. During the forced stage, SST cooling was controlled by entrainment, and the preexisting BL reduced the total cooling by 0.89°C d-1, thus significantly weakening the overall SST cooling induced by Mangkhut. During the relaxation stage, the SST cooling was primarily caused by the entrainment. Our results indicate that a preexisting BL can limit typhoon-induced SST cooling by suppressing the entrainment of cold thermocline water, which contributed to Mangkhut becoming the strongest typhoon in 2018.

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基于W几何形的恒星光谱分子带检测

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光谱学与光谱分析 2024年第8期44卷 2279-2283页

作者：陈奋王颖刘福窑上海工程技术大学数理与统计学院上海201620 上海工程技术大学计算物理与应用研究中心上海201620

研究关注由分子内部能级变化引起的光谱分子带的识别和检测,有助于研究恒星光谱类型和参数估计。首先从分子带的曲线趋势出发,运用曲线分析对分子带进行识别,并剔除具备W形但下降趋势明显的伪分子带。借鉴多类型多分类准则的识别思路,... 详细信息

研究关注由分子内部能级变化引起的光谱分子带的识别和检测,有助于研究恒星光谱类型和参数估计。首先从分子带的曲线趋势出发,运用曲线分析对分子带进行识别,并剔除具备W形但下降趋势明显的伪分子带。借鉴多类型多分类准则的识别思路,将检测出的分子带尖峰深度、W形宽度、曲线趋势和回升趋势四个参数作为训练特征。这四个参数综合考虑了始点变化速率、曲线变化趋势、极值点分布和曲线形状因素。其次,为了验证该方法的可行性与可靠性,利用LightGBM(light gradient boosting machine)模型分别对F型恒星光谱和分子带特征参数进行识别,准确率分别为97.62%和99.16%,进一步验证了所提取分子带的准确性。本工作不仅能挖掘出晚期恒星,提高数据标签的准确性,还能在准确识别的基础上,利用LightGBM机器学习模型检测未知型光谱自动识别晚期恒星,提高了识别效率并且减少了内存占用。

关键词： W几何形特征分子带检测曲线趋势分类识别恒星光谱

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数字技术能否缩小区域制造业全要素生产率差距

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深圳大学学报（人文社会科学版） 2024年第1期41卷 71-82页

作者：刘富华宋然云南财经大学经济学院云南昆明650221 乡村振兴云南省高校协同创新中心云南昆明650221

缩小制造业全要素生产率差距是推动区域协调发展和区域制造业高质量发展的重要内容。数字技术的研发及应用在为制造业全要素生产率增长提供重要动力的同时,也影响着我国制造业全要素生产率的区域差距。利用我国2014-2022年省级面板数据... 详细信息

缩小制造业全要素生产率差距是推动区域协调发展和区域制造业高质量发展的重要内容。数字技术的研发及应用在为制造业全要素生产率增长提供重要动力的同时,也影响着我国制造业全要素生产率的区域差距。利用我国2014-2022年省级面板数据,以适宜性技术进步和技术扩散理论为核心,系统剖析数字技术空间溢出对区域制造业全要素生产率差距的影响,以及数字经济发展水平和科技资源禀赋两大约束条件对数字技术和区域制造业全要素生产率差距之间关系的影响,结果发现:从整体上看,数字技术发展有利于缩小区域制造业全要素生产率差距,数字技术的空间溢出加速了区域间制造业全要素生产率的趋同;从机制上看,数字技术空间后向溢出对区域制造业全要素生产率差距缩小的贡献效果强于前向溢出的效果。当数字技术水平相对较高时,数字技术通过技术扩散缩小了区域制造业全要素生产率差距;当数字技术水平相对较低时,数字技术通过技术扩散扩大了区域制造业全要素生产率差距;当区域创新要素禀赋相似时,数字技术通过技术扩散对区域制造业全要素生产率差距缩小的贡献程度更强。

关键词：数字技术技术扩散空间溢出区域制造业全要素生产率差距空间条件收敛

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多水准地震作用下某隔震框架结构的地震损伤分析

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空间结构 2024年第2期30卷 87-96页

作者：刘慧鹏刘付钧周福霖广州大学工程抗震研究中心广东广州510006 北京构力科技有限公司北京100029

隔震结构是近年快速发展的抗震防灾体系.通过弹塑性动力计算,分析隔震结构在地震作用下的破坏机理与损伤分布情况.该工程为多层框架结构,在底部增加隔震层以提高结构的性能水平.采用SAUSAGE软件建立结构的非线性模型,对其进行动力分析,... 详细信息

隔震结构是近年快速发展的抗震防灾体系.通过弹塑性动力计算,分析隔震结构在地震作用下的破坏机理与损伤分布情况.该工程为多层框架结构,在底部增加隔震层以提高结构的性能水平.采用SAUSAGE软件建立结构的非线性模型,对其进行动力分析,研究结构在多遇地震、设防烈度地震、罕遇地震与极罕遇地震作用下的地震反应和结构损伤过程,并通过傅里叶变换研究结构进入非线性后的频谱特性变化.研究表明,结构性能良好,在罕遇地震作用下结构大部分构件仅为轻微损坏,在极罕遇地震作用下仍未发生倒塌;在各级地震水准作用下隔震支座均为主要耗能构件,且随着地震动的增强耗能增大,上部结构的损伤较小,实现了保护上部结构的设防目标.

关键词：隔震结构地震损伤动力分析弹塑性分析

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论教育强国指标体系建构

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新疆师范大学学报（哲学社会科学版） 2024年第1期45卷 118-126页

作者：刘复兴董昕怡中国人民大学教育学院北京100872 习近平新时代中国特色社会主义思想研究院中国特色社会主义教育研究中心北京100872

党的十八大以来,习近平总书记高度重视我国教育事业,作出一系列关于教育的重要论述,坚持把教育作为国之大计、党之大计。习近平总书记在中共中央政治局第五次集体学习时强调,要加快建设教育强国,为中华民族伟大复兴提供有力支撑。建设... 详细信息

党的十八大以来,习近平总书记高度重视我国教育事业,作出一系列关于教育的重要论述,坚持把教育作为国之大计、党之大计。习近平总书记在中共中央政治局第五次集体学习时强调,要加快建设教育强国,为中华民族伟大复兴提供有力支撑。建设教育强国是习近平总书记关于教育重要论述的战略指向,是全面建成社会主义现代化强国的战略先导,具有重大战略意义。加快建设教育强国亟须构建科学、完善、具有中国特色的指标体系。文本以习近平总书记关于教育的重要论述为指导,以中国式现代化和中国特色社会主义教育发展为目标,全面阐述中国式现代化对建设教育强国提出的新要求和教育强国战略的基本思想内容,在比较研究国际组织教育评估体系及其他国家和地区教育评估体系先进经验的基础上,从国民教育指标体系、终身教育指标体系、高质量发展指标体系、教育投入与保障指标体系、中国特色指标体系五个方面出发,为建构新时代教育强国指标体系提出建议。

关键词：新时代教育强国指标体系中国式教育现代化高质量教育体系

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不同种类珍珠在各种外界环境下的抗腐蚀性研究

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岩石矿物学杂志 2024年第3期43卷 599-610页

作者：刘富康郭颖刘炜明赵贝刘欣宋圆梦中国地质大学(北京)珠宝学院北京100083 中国黄金集团黄金珠宝股份有限公司北京100011 中国地质大学(北京)水资源与环境学院北京100083

通过对不同种类的珍珠进行加热、紫外线照射、汗液、沐浴露和防晒霜等腐蚀实验,分析了这些腐蚀手段对珍珠颜色和化学成分的影响。结果表明,加热对珍珠彩度降低的影响最小,而防晒霜和沐浴露的腐蚀效应最大。金珍珠在各种腐蚀手段下表现... 详细信息

通过对不同种类的珍珠进行加热、紫外线照射、汗液、沐浴露和防晒霜等腐蚀实验,分析了这些腐蚀手段对珍珠颜色和化学成分的影响。结果表明,加热对珍珠彩度降低的影响最小,而防晒霜和沐浴露的腐蚀效应最大。金珍珠在各种腐蚀手段下表现出最为明显的彩度下降。在珍珠腐蚀前后的化学成分分析中发现,各种腐蚀手段普遍导致珍珠表面Ca含量升高、Si含量显著降低。Mn和Sr的含量变化与珍珠种类和腐蚀手段相关。探究不同外界条件对珍珠色泽变化的影响,可为博物馆展览保存、消费者选购提供参考。

关键词：珍珠腐蚀颜色成分

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