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A new class of crystalline X-ray induced photochromic materials assembled from anion-directed folding of a flexible cation

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Chinese Chemical Letters 2024年第8期35卷 554-557页

作者： Hong-Jin Liao Zhu Zhuo Qing Li Yoshihito Shiota Jonathan P.Hill Katsuhiko Ariga Zi-Xiu Lu Lu-Yao Liu Zi-Ang Nan Wei Wang You-gui Huang CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen 361021China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 819-0395Japan World Premier International(WPI)Center for Materials Nanoarchitectonics(MANA) National Institute for Materials Science(NIMS)Ibaraki 305-0044Japan

Electron-deficient viologens are widely used as ligands or structure-directing agents(SDAs)to synthesize crystalline X-ray induced photochromic ***,a new rational strategy of anion-directed fold-ing a flexible cation(H_(2)imb)^(2+)((H_(2)imb)^(2+)=di-protonated 2,3-bis(imidazolin-2-yl)-2,3-dimethylbutane)has been ***-donating Cl−and(ZnCl4)2−are used to direct folding a flexible electron-deficient(H_(2)imb)^(2+)*** complexes(H_(2)imb)(NO_(3))2(1),(H_(2)imb)Cl2·H_(2)O(2),and(H_(2)imb)ZnCl4(3)have been synthesized in which(H_(2)imb)^(2+)crystallize in an anti-conformation,88.8°-gauche,and 51.8°-gauche,*** contrary to X-ray silent complex 1,X-ray induced photochromism has been achieved in both complex 2 and *** intermolecular charge-transfer mechanism has been elucidated and the anion directed folding of(H_(2)imb)^(2+)has been validated to be critical to yield colored long-lived charge-separated states.

关键词： Supramolecular Photochromic X-ray induced Anion-directed folding Electron-deficient viologens

Applying dynamic light scattering to investigate the self-assembly process of DNA nanostructures

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Chinese Chemical Letters 2024年第3期35卷 316-320页

作者： Wei Yuan gui-Zhi Dong Hui Ning Xiang-Xiang Guan Jia-Feng Cheng Zi-Wei Shi Xiu-Ji Du Si-Wen Meng Dong-Sheng Liu Yuan-Chen Dong CAS Key Laboratory of Colloid Interface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Dandong Bettersize Instruments Ltd. Dandong 118000China Key Laboratory of Organic Optoelectronics&Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China Department of Chemistry Renmin University of ChinaBeijing 100872China

Understanding the dynamic assembly process of DNA nanostructures is important for developing novel strategy to design and construct functional *** this work,temperature-controlled dynamic light scattering(DLS)strategy has been applied to study the global assembly process of DNA origami and DNA *** the temperature dependent size and intensity profiles,the self-assembly process of various DNA nanostructures with different morphologies have been well-studied and the temperature transition ranges could be *** advantage of the DLS information,rapid preparation of the DNA origami and the brick assembly has been realized through a constant temperature *** results demonstrate that the DLS-based strategy provides a convenient and robust tool to study the dynamic process of forming hieratical DNA structures,which will benefit understanding the mechanism of self-assembly of DNA nanostructures.

关键词： Dynamic light scattering Self-assembly process DNA nanostructures Temperature transition ranges Rapid preparation

Concomitant epidermal growth factor receptor mutation/c-ros oncogene 1 rearrangement in non-small cell lung cancer: A case report

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World Journal of Clinical Oncology 2024年第7期15卷 945-952页

作者： gui-Qin Peng Hai-Chi Song Wan-Yi Chen Department of Pharmacy Chongqing University Cancer HospitalChongqing 400030China

BACKGROUND Epidermal growth factor receptor(EGFR)mutation and c-ros oncogene 1(ROS1)rearrangement are key genetic alterations and predictive tumor markers for non-small cell lung cancer(NSCLC)and are typically considered to be mutually ***/ROS1 co-mutation is a rare event,and the standard treatment appr-oach for such cases is still *** SUMMARY Herein,we report the case of a 64-year-old woman diagnosed with lung adenocar-cinoma,with concomitant EGFR L858R mutation and ROS1 *** patient received two cycles of chemotherapy after surgery,but the disease *** 1-month treatment with gefitinib,the disease progressed ***,after switching to crizotinib,the lesion became ***,crizotinib has been administered for over 53 months with a remarkable treatment *** The efficacy of EGFR tyrosine kinase inhibitors and crizotinib was vastly different in this NSCLC patient with EGFR/ROS1 *** report will aid future treatment of such patients.

关键词： Non-small cell lung cancer Epidermal growth factor receptor C-ros oncogene 1 Co-mutation Treatment strategies Case report

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中国国土空间布局优化研究

地理学报 2024年第3期79卷 672-687页

作者：董寅金贵邓祥征福建师范大学湿润亚热带生态地理过程教育部重点实验室福州350007 福建师范大学地理科学学院福州350007 中国地质大学(武汉)经济管理学院武汉430074 中国科学院地理科学与资源研究所中国科学院陆地表层格局与模拟重点实验室北京100101 中国科学院大学资源与环境学院北京101408

国土空间发展格局事关经济发展、社会福祉与生态安全,而资源效率成为空间冲突加剧、资源约束趋紧背景下科学优化国土空间布局的基础支撑。本文基于全国市域国土资源效率值设计国土空间开发保护情景方案并评价不同偏好下的国土空间发展潜... 详细信息

国土空间发展格局事关经济发展、社会福祉与生态安全,而资源效率成为空间冲突加剧、资源约束趋紧背景下科学优化国土空间布局的基础支撑。本文基于全国市域国土资源效率值设计国土空间开发保护情景方案并评价不同偏好下的国土空间发展潜力,进而定量刻画“点—轴—面”一体化的国土空间布局蓝图。结果表明:(1)中国国土资源效率稳步上升但整体水平偏低,区域间发展不均衡。(2)研究期内中国国土空间发展潜力持续提升,开发导向下潜力水平相较更高,且不同情景下潜力高值区围绕城市群地区向外轴向扩散。(3)中心点与发展轴线的分布格局经历了由“三足鼎立”向菱形结构演化的过程,其中沿海通道、京哈—京广通道及沿江通道的主体地位突出。(4)战略点向关键轴线有序集聚,优势区在胡焕庸线两侧呈明显分化。组合国土空间结构要素分别形成开发优先、维持现状与保护优先3类情景下“五横三纵,八核三区”“四横三纵,六核三区”与“三横四纵,五核三区”的国土空间布局蓝图。本文研究结果可为实现高质量国土空间发展格局与美丽国土愿景提供技术依据和理论支撑。

关键词：国土空间资源效率开发保护发展潜力布局蓝图中国

Wireless measurement of orthodontic forces in invisible aligners

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Medicine in Novel Technology and Devices 2024年第1期21卷 64-70页

作者： Siyu Wang Bingxin Xu Xiaokang Wang Xinfang Li Bangzheng Pu gui Chen Jianmin Han Shengzhao Xiao Yubo Fan Jiebo Li Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of EducationInstitute of Medical PhotonicsBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100191China Department of Orthodontics Peking University School and Hospital of Stomatology&.National Clinical Research Center for Oral Diseases&.National Engineering Laboratory for Digital and Material Technology of Stomatology&.Beijing Key Laboratory of Digital Stomatology&.Research Center of Engineering and Technology for Computerized Dentistry Ministry of HealthBeijing100081China Department of Dental Materials Peking University School and Hospital of Stomatology&National Center of Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of Stomatology&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental MaterialsBeijing100081China Department of Orthodontics Shanghai Ninth People's HospitalCollage of StomatologyShanghai Jiao Tong University School of MedicineNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology&Shanghai Research Institute of StomatologyShanghaiChina

Invisible orthodontic treatment is an effective form of malocclusion treatment favored in recent *** magnitude of its orthodontic force has a crucial impact on the outcome of the treatment and has gained a high level of clinical ***,there are very few explorations of in vivo measurements of orthodontic force,and existing studies are limited to a large number of couplings,which are inconvenient for clinical *** this work,we developed a wireless flexible measurement system that allows quantitative measurement of the orthodontic force of an invisible aligner on a dental *** system is wireless,tiny,flexible,fast responding,and has a range suitable for the range of orthodontic *** show the difference in the orthodontic force applied to different tooth positions and the difference in the orthodontic force applied to different positions of the same *** addition,the system can evaluate the mechanical differences between aligners of different brands and materials as well as the deviation of fabrication *** system provides a test tool and evaluation method for future real-time assessment of clinical orthodontic forces.

关键词： Orthodontic forces Wireless measurement systems Flexible sensors Invisible orthodontics Performance evaluation Quantitative measurements

When Crowdsourcing Meets Data Markets:A Fair Data Value Metric for Data Trading

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Journal of Computer Science & Technology 2024年第3期39卷 671-690页

作者：刘洋溯郑臻哲吴帆陈贵海 Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China CCF ACM IEEE

Large-quantity and high-quality data is critical to the success of machine learning in diverse *** with the dilemma of data silos where data is difficult to circulate,emerging data markets attempt to break the dilemma by facilitating data exchange on the ***,on the other hand,is one of the important methods to efficiently collect large amounts of data with high-value in data *** this paper,we investigate the joint problem of efficient data acquisition and fair budget distribution across the crowdsourcing and data *** propose a new metric of data value as the uncertainty reduction of a Bayesian machine learning model by integrating the data into model *** by this data value metric,we design a mechanism called Shapley Value Mechanism with Individual Rationality(SV-IR),in which we design a greedy algorithm with a constant approximation ratio to greedily select the most cost-efficient data brokers,and a fair compensation determination rule based on the Shapley value,respecting the individual rationality *** further propose a fair reward distribution method for the data holders with various effort levels under the charge of a data *** demonstrate the fairness of the compensation determination rule and reward distribution rule by evaluating our mechanisms on two real-world *** evaluation results also show that the selection algorithm in SV-IR could approach the optimal solution,and outperforms state-of-the-art methods.

关键词： data trading crowdsourcing mechanism design Shapley value

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考虑尺度的结合面切向刚度模型

机械工程学报 2024年第3期60卷 181-190页

作者：罗治军阎绍泽田桂清华大学机械工程系北京100084 中国人民解放军96963部队博士创新工作站北京100084 陆军航空兵学院航电和兵器工程系北京101123

接触刚度是结合面特性中最重要的参数之一,直接影响着机械结构整体的动力学特性。GW(Greenwood&Williamson)模型是目前被广泛应用的结合面接触模型,在许多实验中取得了较好的预测结果。理论上,GW模型预测结果受仪器分辨率影响,预测值并... 详细信息

接触刚度是结合面特性中最重要的参数之一,直接影响着机械结构整体的动力学特性。GW(Greenwood&Williamson)模型是目前被广泛应用的结合面接触模型,在许多实验中取得了较好的预测结果。理论上,GW模型预测结果受仪器分辨率影响,预测值并不唯一,但是实验得到的宏观物理量如刚度、导电率等却是唯一值。这一矛盾说明,存在一个唯一的计算或者观测尺度以确保宏观结果的唯一性。理论上分析了GW模型的尺度依赖特性;研究了采用高斯滤波器实现计算尺度变换的方法;基于Thomas的接触理论,设计了确定滤波器截止频率的迭代方法;最终提出了一种考虑尺度的结合面切向刚度计算框架。搭建了切向刚度试验台,对考虑尺度的切向刚度模型进行验证。结果表明,考虑尺度的模型与实验结果吻合较好。

关键词：真实接触面接触模型尺度依赖 GW模型 MB模型

基于NESO-LFDC的四旋翼无人机滑模姿态控制

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系统工程与电子技术 2024年第3期46卷 1075-1083页

作者：桂洋郑柏超高鹏南京信息工程大学自动化学院江苏南京210044 江苏省大气环境与装备技术协同创新中心江苏南京210044

针对四旋翼无人机姿态控制中存在空气动力学特性复杂,易受干扰的特性,提出一种基于非线性扩张状态观测器(nonlinear extended state observer,NESO)和低频干扰补偿器(low-frequency disturbance compensator,LFDC)的非奇异快速终端滑模... 详细信息

针对四旋翼无人机姿态控制中存在空气动力学特性复杂,易受干扰的特性,提出一种基于非线性扩张状态观测器(nonlinear extended state observer,NESO)和低频干扰补偿器(low-frequency disturbance compensator,LFDC)的非奇异快速终端滑模控制方法。该方法内环设计了NESO和LFDC结合,以获得干扰补偿值并补偿总干扰的低频分量。在外环设计了跟踪微分器和可变切换增益的非奇异快速终端滑模控制器,用于补偿虚拟干扰估计值的误差和总干扰的高频分量。仿真结果表明,该控制方法可以更好地估计总干扰的低频和高频分量,减少虚拟干扰估计值的误差对四旋翼无人机姿态控制的影响,并提升响应速度。

关键词：四旋翼无人机姿态控制非线性扩张状态观测器跟踪微分器低频干扰补偿器非奇异快速终端滑模控制

基于观测器的人在环多机械臂系统预设性能二分一致性

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自动化学报 2024年第9期50卷 1761-1771页

作者：刘沛明郭祥贵北京科技大学自动化学院北京100083 北京市工业波谱成像工程技术研究中心北京100083

研究通讯拓扑为符号有向图的人在环多机械臂系统的预设性能二分一致性跟踪控制问题.为在预设时间内收敛到预设精度,提出一种基于观测器的预设性能控制策略.首先,设计预设时间和精度的观测器以估计领导者的输出信息,通过合作/竞争信息交... 详细信息

研究通讯拓扑为符号有向图的人在环多机械臂系统的预设性能二分一致性跟踪控制问题.为在预设时间内收敛到预设精度,提出一种基于观测器的预设性能控制策略.首先,设计预设时间和精度的观测器以估计领导者的输出信息,通过合作/竞争信息交互实现观测器输出的二分一致性.该观测器不需要领导机械臂的输入信息及输出信息的高阶导数,并通过无芝诺行为的事件触发机制降低不同机械臂间的通讯负担.其次,通过反步法及误差转化法将有约束的机械臂输出跟踪问题转化为无约束的误差系统稳定性问题,进而基于观测器输出设计机械臂的输出调节控制器.值得一提的是,设计的控制策略不需要系统初始状态的先验知识且避免了预设时刻控制增益无穷大的现象,增强了系统的可靠性.最后,仿真结果表明所提控制策略的可行性及优越性.

关键词：多机械臂系统二分一致性预设时间和精度人在环控制

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