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Photo-responsive functional materials based on light-driven molecular motors

Light(Science & Applications) 2024年第3期13卷 407-420页

作者： Yanping Deng Guiying Long Yang Zhang Wei Zhao guofu zhou Ben L.Feringa Jiawen Chen SCNU-UG International Joint Laboratory of Molecular Science and Displays National Center for International Research on Green OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Stratingh Institute for Chemistry University of GroningenNijenborgh 49747AG GroningenThe Netherlands

In the past two decades,the research and development of light-triggered molecular machines have mainly focused on developing molecular devices at the nanoscale.A key scientific issue in the field is how to amplify the controlled motion of molecules at the nanoscale along multiple length scales,such as the mesoscopic or the macroscopic scale,or in a more practical perspective,how to convert molecular motion into changes of properties of a macroscopic ***-driven molecular motors are able to perform repetitive unidirectional rotation upon irradiation,which offers unique opportunities for responsive macroscopic *** several reviews that focus on the design,synthesis and operation of the motors at the nanoscale,photo-responsive macroscopic materials based on light-driven molecular motors have not been comprehensively *** the present review,we first discuss the strategy of confining absolute molecular rotation into relative rotation by grafting motors on ***,examples of self-assemble motors in supramolecular polymers with high internal order are ***,we will focus on building of motors in a covalently linked system such as polymeric gels and polymeric liquid crystals to generate complex responsive ***,a perspective toward future developments and opportunities is *** review helps us getting a more and more clear picture and understanding on how complex movement can be programmed in light-responsive systems and how man-made adaptive materials can be invented,which can serve as an important guideline for further design of complex and advanced responsive materials.

关键词： functions materials material

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A Lambda Layer-Based Convolutional Sequence Embedding Model for Click-Through Rate Prediction

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Wuhan University Journal of Natural Sciences 2024年第3期29卷 198-208页

作者： zhou Liliang YUAN Shili FENG Zijian DAI Guilan zhou guofu Tenth Research Institute China Electronics Technology Group CorporationChengdu 610000SichuanChina Department of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina Research Institution of Information Technology Tsinghua UniversityBeijing 100084China School of Computer Science Wuhan UniversityWuhan 430072HubeiChina

In the era of intelligent economy, the click-through rate(CTR) prediction system can evaluate massive service information based on user historical information, and screen out the products that are most likely to be favored by users, thus realizing customized push of information and achieve the ultimate goal of improving economic benefits. Sequence modeling is one of the main research directions of CTR prediction models based on deep learning. The user's general interest hidden in the entire click history and the short-term interest hidden in the recent click behaviors have different influences on the CTR prediction results, which are highly important. In terms of capturing the user's general interest, existing models paid more attention to the relationships between item embedding vectors(point-level), while ignoring the relationships between elements in item embedding vectors(union-level). The Lambda layer-based Convolutional Sequence Embedding(LCSE) model proposed in this paper uses the Lambda layer to capture features from click history through weight distribution, and uses horizontal and vertical filters on this basis to learn the user's general preferences from union-level and point-level. In addition, we also incorporate the user's short-term preferences captured by the embedding-based convolutional model to further improve the prediction results. The AUC(Area Under Curve) values of the LCSE model on the datasets Electronic, Movie & TV and MovieLens are 0.870 7, 0.903 6 and 0.946 7, improving 0.45%, 0.36% and 0.07% over the Caser model, proving the effectiveness of our proposed model.

关键词： click-through rate prediction deep learning attention mechanism convolutional neural network

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Highly efficient nonuniform finite difference method for three-dimensional electrically stimulated liquid crystal photonic devices

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Photonics Research 2024年第4期12卷 865-875页

作者： ZHENGHAO GUO MENGJUN LIU ZIJIA CHEN RUIZHI YANG PEIYUN LI HAIXIA DA DONG YUAN guofu zhou LINGLING SHUI HUAPENG YE Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China SCNU-TUE Joint Lab of Device Integrated Responsive Materials(DIRM) National Center for International Research on Green OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Joint Laboratory of Optofluidic Technology and Systems National Center for International Research on Green OptoelectronicsSouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province Nanjing 210023China

Liquid crystal(LC)photonic devices have attracted intensive attention in recent decades,due to the merits of tunability,cost-effectiveness,and high ***,the precise and efficient simulation of large-scale three-dimensional electrically stimulated LC photonic devices remains challenging and resource *** we report a straightforward nonuniform finite difference method(NFDM)for efficiently simulating largescale LC photonic devices by employing a spatially nonuniform mesh grid.

关键词： nonuniform crystal finite

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Multi-Strategy Improvement of Sparrow Search Algorithm for Cloud Manufacturing Service Composition

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Wuhan University Journal of Natural Sciences 2024年第4期29卷 323-337页

作者： zhou Liliang LI Ben YU Qing DAI Guilan zhou guofu Tenth Research Institute China Electronics Technology Group CorporationChengdu 610000SichuanChina Department of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina Research Institution of Information Technology Tsinghua UniversityBeijing 100084China School of Computer Science Wuhan UniversityWuhan 430072HubeiChina

In existing research,the optimization of algorithms applied to cloud manufacturing service composition based on the quality of service often suffers from decreased convergence rates and solution quality due to single-population searches in fixed spaces and insufficient information *** this paper,we introduce an improved Sparrow Search Algorithm(ISSA)to address these *** fixed solution space is divided into multiple subspaces,allowing for parallel searches that expedite the discovery of target *** enhance search efficiency within these subspaces and significantly improve population diversity,we employ multiple group evolution mechanisms and chaotic perturbation ***,we incorporate adaptive weights and a global capture strategy based on the golden sine to guide individual discoverers more ***,differential Cauchy mutation perturbation is utilized during sparrow position updates to strengthen the algorithm's global optimization *** experiments on benchmark problems and service composition optimization problems show that the ISSA delivers superior optimization accuracy and convergence stability compared to other *** results demonstrate that our approach effectively balances global and local search abilities,leading to enhanced performance in cloud manufacturing service composition.

关键词： cloud manufacturing service composition optimization quality of service sparrow search algorithm

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Dynamic Control of Multiple Optical Patterns of Cholesteric Liquid Crystal Microdroplets by Light-Driven Molecular Motors

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CCS Chemistry 2024年第2期6卷 427-438页

作者： Jiaqin Li Shuting Xie Jiahui Meng Yuying Liu Qi Zhan Yang Zhang Lingling Shui guofu zhou Ben L.Feringa Jiawen Chen SCNU-UG International Joint Laboratory of Molecular Science and Displays National Center for International Research on Green OptoelectronicsSouth China Normal UniversityGuangzhou 510006 Joint Laboratory of Optofluidic Technology and Systems Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006 Stratingh Institute for Chemistry University of Groningen9747AG Groningen

The key to high-level encryption and anti-counterfeiting techniques is the storage of multiple levels of distinct information that can be individually and precisely addressed by certain *** continues to be a formidable challenge as the concealed images or codes must be read with fast response and high resolution without cross-talk to the first layer of ***,we report a non-fluorescencebased strategy to establish responsive encryption labels taking advantage of solely tuning multiple optical patterns of cholesteric liquid crystal(CLC)microdroplets doped with light-driven molecular *** photo-triggered unidirectional rotation of the motor induced not only changes in the helical twist power value but the opposite helical orientation of the superstructure in CLCs as well,resulting in changes in both the structural color and the selective reflection of circularly polar *** designed labels,which featured highly selective addressability of dual-level distinct information,good reversibility,and viewing angle-independence,were applied to build devices for daily practical use,demonstrating great potential in anti-counterfeiting technology and provide a versatile platform for enhanced data protection and encryption of authentic information.

关键词： molecular motor chirality amplification cholesteric liquid crystal anti-counterfeiting label data encryption

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中国数字经济核心产业规模再测算研究

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统计与信息论坛 2024年第1期39卷 3-15页

作者：李海霞周国富天津财经大学统计学院天津300222 内蒙古财经大学统计与数学学院内蒙古呼和浩特010070

针对现有文献在数字经济规模的测算方法方面存在的分歧,首先基于国家统计局发布的《数字经济及其核心产业统计分类(2021)》,明确了投入产出表中的部门分类与数字经济核心产业各细分行业的对应关系;然后基于官方发布的投入产出表及投入... 详细信息

针对现有文献在数字经济规模的测算方法方面存在的分歧,首先基于国家统计局发布的《数字经济及其核心产业统计分类(2021)》,明确了投入产出表中的部门分类与数字经济核心产业各细分行业的对应关系;然后基于官方发布的投入产出表及投入产出延长表、学者编制的时间序列投入产出表,结合历次经济普查数据,采取将数字经济核心产业各细分行业的增加值按比例从国民经济各行业增加值中剥离出来的做法,测算了中国1981—2020年数字经济核心产业的规模及其各细分行业的占比;并与代表性文献在同口径下进行了比较,验证了测算结果的稳健性。在此基础上,预测了“十四五”时期各年中国数字经济核心产业可能达到的规模及其各细分行业的占比,并对未来数字经济核心产业的发展趋势以及数字经济统计制度建设进行了展望。

关键词：数字经济核心产业统计分类增加值测算方法投入产出表

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国家级新区建设对城市创新水平的影响研究

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西南民族大学学报（人文社会科学版） 2024年第5期45卷 102-115页

作者：陈鑫鹏周国富郭青华天津财经大学统计学院天津财经大学国民经济研究所天津财经大学财税与公共管理学院天津300222

创新是发展的核心动力,对于推动我国经济高质量发展意义重大。文章基于2002-2021年我国85个大中城市的面板数据,综合运用多时点双重差分模型、分位数回归模型,实证检验了国家级新区的设立对城市创新水平的影响及其区域异质性。研究结果... 详细信息

创新是发展的核心动力,对于推动我国经济高质量发展意义重大。文章基于2002-2021年我国85个大中城市的面板数据,综合运用多时点双重差分模型、分位数回归模型,实证检验了国家级新区的设立对城市创新水平的影响及其区域异质性。研究结果显示,国家级新区设立后对城市创新水平有显著的促进作用,这一结论在经过一系列稳健性检验后仍然成立。但是,国家级新区对城市创新水平的影响存在区域异质性,对中部、西部、东北地区城市创新水平的提升效果优于东部地区,对北方城市创新水平的提升效果优于南方,对创新水平较低城市的提升效果优于创新水平已较高的城市。此外,国家级新区对城市创新水平的促进作用整体上随着距离的增大逐步衰减并在局部形成集聚阴影区,距离国家级新区264千米以上的区域不再受此项政策的影响。中介效应检验表明,国家级新区通过带动城市经济发展进而促进城市创新水平的提升。

关键词：国家级新区创新驱动双重差分分位数回归经济高质量发展

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喀斯特山地城市“三生”空间格局演化及碳代谢研究——以贵阳市为例

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绿色科技 2024年第1期26卷 205-213页

作者：王莎周国富贵州师范大学地理与环境科学学院贵州贵阳550025

以贵阳市为例探索喀斯特山地城市“三生”空间格局演变与城市碳代谢之间的耦合关系,有助于“三生”空间资源协同优化,为未来低碳城市规划提供参考。通过构建“三生”空间及碳源(汇)属性分类体系,利用转移矩阵分析贵阳市2010-2020年“三... 详细信息

以贵阳市为例探索喀斯特山地城市“三生”空间格局演变与城市碳代谢之间的耦合关系,有助于“三生”空间资源协同优化,为未来低碳城市规划提供参考。通过构建“三生”空间及碳源(汇)属性分类体系,利用转移矩阵分析贵阳市2010-2020年“三生”空间格局演化特征,并运用碳流模型和生态网络分析方法探讨“三生”空间演化的碳代谢过程及其生态关系。结果表明:①2010-2020年,贵阳市“三生”空间格局变化显著,工业生产空间、城镇生活空间呈持续增长态势,农村生活空间呈现先增后减的态势,其余空间用地则呈现减少态势;②贵阳市垂直方向碳通量和水平方向净碳流值均为负,“三生”空间格局演化造成了碳排放量增加,碳收支存在明显不平衡现象;③整个研究期间掠夺限制关系始终占据主导地位,互惠共生关系也明显增加,随着“三生”空间格局演化程度愈发剧烈,竞争关系也随之出现。贵阳市“三生”空间格局演化对促进彼此绿色发展生态关系具有积极影响,但同时也存在问题,需进一步打造低碳城镇化建设布局,促进绿色发展。

关键词： “三生”空间碳代谢生态网络分析贵阳市

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The electrochemical reforming of glycerol at Pd nanocrystals modified ultrathin NiO nanoplates hybrids:An efficient system for glyceraldehyde and hydrogen coproduction

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Nano Research 2022年第3期15卷 1934-1941页

作者： Ge Ma Na Yang guofu zhou Xin Wang South China Academy of Advanced Optoelectronics and International Academy of Optoelectronics at Zhaoqing South China Normal UniversityGuangzhou 510631China

The glycerol electro-oxidation reaction(GEOR)is a green and promising method for the glyceraldehyde *** this work,Pd nanocrystals(Pd-NCs)modified ultrathin NiO nanoplates(NiO-uNPs)hybrids(Pd-NCs/NiO-uNPs)are successfully synthesized using successive cyanogel hydrolysis,chemical reduction,and calcination treatment *** electrochemical measurements and physicochemical characterization results demonstrate that Pd-NCs/NiO-uNPs hybrids have excellent electrocatalytic performance for both GEOR and hydrogen evolution reaction(HER)in alkaline medium,which benefit from the large specific surface area,uniform distribution of Pd-NCs,and the modified electronic structure of Ni *** Pd-NCs/NiO-uNPs hybrids,only 1.43 V is needed to obtain the current density of 100 mA∙cm^(−2) for GEOR,much lower than that for oxygen evolution reaction(1.82 V).In addition,Pd-NCs/NiO-uNPs hybrids exhibit better HER performance than commercial Pd/C *** a result,the constructed Pd-NCs/NiO-uNPs||Pd-NCs/NiO-uNPs glycerol electrolyzer only requires 1.62 V electrolysis voltage to reach 10 mA∙cm^(−2) current density,showing an energy-efficient and economy-competitive synthesis for the coproduction of glyceraldehyde and hydrogen.

关键词： NiO nanoplates Pd nanocrystals synergistic effect glycerol electro-oxidation reaction hydrogen evolution reaction

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基于光纤端面集成的液晶光束整形器件

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液晶与显示 2024年第5期39卷 672-682页

作者：张永瑛李佩芸郭政昊袁冬叶华朋周国富华南师范大学华南先进光电子研究院广东广州510640

光纤集成器件因其尺寸小、功能高度集成化等优点,近年来受到越来越多的关注。当前光纤集成器件通常由介质型或金属型微结构组成,其制备加工通常依赖于高精度的微纳加工技术,面临着成本高和工艺复杂等挑战。另外,静态、固定几何结构的光... 详细信息

光纤集成器件因其尺寸小、功能高度集成化等优点,近年来受到越来越多的关注。当前光纤集成器件通常由介质型或金属型微结构组成,其制备加工通常依赖于高精度的微纳加工技术,面临着成本高和工艺复杂等挑战。另外,静态、固定几何结构的光纤光学器件功能不可调,也在极大程度上限制了其应用范围。本文设计并验证了一种基于光纤端面集成的液晶光束整形器件。通过对单模光纤端面加工平行锚定和垂直锚定的液晶聚合物液滴,获得了可见光波段的光束整形器件。基于Q-张量模型和Rayleigh-Sommerfeld衍射理论,实现了具有特殊液晶指向矢排布的液晶聚合物液滴的模拟仿真。通过实验验证了不同锚定条件下液晶聚合物液滴的光学性能,实验结果与仿真结果基本吻合,证明了该液晶器件的光束整形能力。这种液晶器件为光纤光学器件的微型化与集成化提供了一种成本较低、高效便捷的全新途径。

关键词：光束整形光纤端面液晶聚合物液滴液晶指向矢集成化器件

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