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Distribution and seasonal variation of estrogenic endocrine disrupting compounds,N-nitrosodimethylamine, and N-nitrosodimethylamine formation potential in the Huangpu River, China

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Journal of Environmental Sciences 2014年第5期26卷 1023-1033页

作者： ai Zhang Yongmei li ling Chen State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University

Detection of estrogenic endocrine disrupting compounds （EDCs） and N-nitrosodimethylamine （NDMA） in drinking water has led to rising concerns. There are, however, a paucity of studies on the distribution and seasonal variation of NDMA and NDMA formation potential （NDMA-FP） in natural waters, especially in China. For EDCs, limited studies have investigated the distribution and seasonal variation of estrone （El）, 1713-estradiol （E2）, estriol （E3）, 17a-ethinylestradiol （EE2）, technical-nonylphenols （t-NP）, and bisphenol A （BPA） in Shanghai. In this study, water samples were collected from 11 sampling sites along the Huangpu River in 2012. The distribution and seasonal variation of EDCs, NDMA, and NDMA-FP were investigated. The results showed that all of the 11 sampling sites were contaminated by the target compounds. Compared with E2 and EE2, higher E1 and E3 concentrations were usually detected in the Huangpu River. The values of 17β- estradiol equivalents （EEQ） suggest a high possibility of endocrine effects on exposed organisms in the Huangpu River. NDMA-FP and t-NP were the dominant contaminants among the eight target compounds. The detection rates of the target compounds and their concentrations were both higher in dry seasons than in wet seasons. Higher concentrations of target compounds were observed in urban sampling sites near drainage outlets, and also in suburban sampling sites where intensive livestock farming and farmlands were located.

关键词： EDCs NDMA NDMA-FP seasonal variation spatial distribution

Formulae for secondary electron yield from insulators and semiconductors

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Nuclear Science and Techniques 2017年第10期28卷 9-14页

作者： ai-Gen Xie Min Lai Yu-lin Chen Yu-qing Xia School of Physics and Optoelectronic Engineering Nanjing University of Information Science and TechnologyNanjing 210044China

The processes and characteristics of secondary electron emission in insulators and semiconductors were studied, and the formulae for the maximum yield(δ_m) at W_(pOm)≤ 800 eV and the secondary electron yield from insulators and semiconductors δ at the primary incident energy of 2 keV≤ W_(pO) < 10 keV(δ_(2-10)) and10 keV ≤ W_(pO)≤100 keV(δ_(10-100)) were deduced. The calculation results were compared with their corresponding experimental data. It is concluded that the deduced formulae can be used to calculate δ_(2-100)at W_(pOm)≤ 800 eV.

关键词：半导体绝缘体公式二次电子产额电子发射特性计算结果次级电子

Architectural Design of a Cloud Robotic System for Upper-limb Rehabilitation with Multimodal Interaction

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Journal of Computer Science & Technology 2017年第2期32卷 258-268页

作者： Hui-Jun li ai-Guo Song School of Instrument Science and Engineering Southeast University Nanjing 210096 China

The rise in the cases of motor impairing therapy. Due to the current situation that the service illnesses demands the research for improvements in rehabilitation of the professional therapists cannot meet the need of the motorimpaired subjects, a cloud robotic system is proposed to provide an Internet-based process for upper-limb rehabilitation with multimodal interaction. In this system, therapists and subjects are connected through the Internet using client/server architecture. At the client site, gradual virtual games are introduced so that the subjects can control and interact with virtual objects through the interaction devices such as robot arms. Computer graphics show the geometric results and interaction haptic/force is fed back during exercising. Both video/audio information and kinematical/physiological data axe transferred to the therapist for monitoring and analysis. In this way, patients can be diagnosed and directed and therapists can manage therapy sessions remotely. The rehabilitation process can be monitored through the Internet. Expert libraries on the central server can serve as a supervisor and give advice based on the training data and the physiological data. The proposed solution is a convenient application that has several features taking advantage of the extensive technological utilization in the area of physical rehabilitation and multimodal interaction.

关键词： cloud robot multimodal interaction motor rehabilitation haptic/force feedback

2D mesoporous materials

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National Science Review 2022年第5期9卷 12-14页

作者： Yan ai Wei li Dongyuan Zhao Department of Chemistry Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and State Key Laboratory of Molecular Engineering of PolymersFudan University

Mesoporous materials with high surface areas,large pore volumes,tunable nanostructures and diverse compositions have been widely investigate d,and show great promise in adsorption,catalysis,separation,biomedicine,ener...

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Oxidative stress and DNA damages induced by cadmium accumulation

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Journal of Environmental Sciences 2007年第5期19卷 596-602页

作者： liN ai-jun ZHANG Xu-hong CHEN Mei-mei CAO qing Department of Environmental Science and Engineering Beijing University of Chemical Technology Beijing 100029 China Department of Soil Environmental Sciences Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Beijing City University Beijing 100083 China

Experimental evidence shows that cadmium （Cd） could induce oxidative stress and then causes DNA damage in animal cells, however, whether such effect exists in plants is still unclear. In the present study, Vicia faba plants was exposed to 5 and 10 mg/L Cd for 4 d to investigate the distribution of Cd in plant, the metal effects on the cell lipids, antioxidative enzymes and DNA damages in leaves. Cd induced an increase in Cd concentrations in plants. An enhanced level of lipid peroxidation in leaves and an enhanced concentration of H2O2 in root tissues suggested that Cd caused oxidative stress in Vicia faba. Compared with control, Cd-induced enhancement in superoxide dismutase activity was significant at 5 mg/L than at 10 mg/kg in leaves, by contrast, catalase and peroxidaseactivities were significantly suppressed by Cd addition. DNA damage was detected by neutral/neutral, alkaline/neutral and alkaline/alkaline Comet assay. Increased levels of DNA damages induced by Cd occurred with reference to oxidative stress in leaves, therefore, oxidative stress induced by Cd accumulation in plants contributed to DNA damages and was possibly an important mechanism of Cd-phytotoxicity in Vicia faba plants.

关键词： Cd Vicia faba oxidative stress DNA damage

跑台训练激活内源性神经干细胞促进小鼠脊髓损伤的修复

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中国组织工程研究 2025年第19期29卷 3976-3982页

作者：陈婵娟上官泽宇李琦哲谭伟李青贵州医科大学附属医院创伤骨科贵州省贵阳市550004 贵州医科大学临床医学院贵州省贵阳市550025

背景:跑台训练是促进脊髓损伤后运动功能恢复的有效方法之一,可以促进神经发生,但是不同强度跑台训练对脊髓内源性干细胞的激活作用尚不明确。目的:分析不同强度跑台训练对脊髓损伤后小鼠脊髓内源性神经干细胞的激活作用。方法:取雌性C5... 详细信息

背景:跑台训练是促进脊髓损伤后运动功能恢复的有效方法之一,可以促进神经发生,但是不同强度跑台训练对脊髓内源性干细胞的激活作用尚不明确。目的:分析不同强度跑台训练对脊髓损伤后小鼠脊髓内源性神经干细胞的激活作用。方法:取雌性C57BL/6J小鼠50只,采用随机数字表法分为对照组、脊髓损伤组及低、中、高强度运动组,每组10只。脊髓损伤组及低、中、高强度运动组利用钳夹法构建T10节段脊髓损伤模型,脊髓损伤后第7天,低、中、高强度运动组分别进行对应强度的跑台训练,3次/d,10 min/次,每周训练6次,连续训练28 d。跑台训练后3,7,14,21,28 d,采用BMS评分评估小鼠后肢运动功能;跑台训练后28 d,获取损伤区域脊髓组织,检测细胞激活标志物表皮生长因子受体、静止细胞标志物胶质纤维酸性蛋白、增殖标志物5-乙炔基-2-脱氧尿苷(EdU)表达,苏木精-伊红染色观察脊髓组织形态。结果与结论:①脊髓损伤各组小鼠BMS评分始终低于对照组(P<0.05);随着跑台训练时间的延长,脊髓损伤小鼠BMS评分逐渐升高,中强度运动组小鼠跑台训练后14,21 d的BMS评分高于脊髓损伤组及低、高强度运动组(P<0.05),中、高强度运动组小鼠跑台训练后28 d的BMS评分高于脊髓损伤组、低强度运动组(P<0.05)。②与对照组比较,脊髓损伤组表皮生长因子受体与EdU阳性细胞比例升高(P<0.05);与脊髓损伤组比较,低、中、高强度运动组表皮生长因子受体与EdU阳性细胞比例均升高(P<0.05),并且中强度运动组最高。与对照组比较,脊髓损伤组胶质纤维酸性蛋白阳性细胞比例升高(P<0.05);与脊髓损伤组比较,低、中、高强度运动组胶质纤维酸性蛋白阳性细胞比例降低(P<0.05),并且中强度运动组最低。③苏木精-伊红染色显示脊髓损伤组小鼠损伤区域形成大片空洞,不同强度跑台训练后脊髓损伤小鼠损伤区域空洞减小,并且中强度运动组减小最明显。④结果表明,低、中、高强度的跑台训练可通过激活内源性神经干细胞促进脊髓损伤小鼠运动功能的恢复,其中中强度运动训练的效果最明显。

关键词：脊髓损伤跑台训练脊髓神经干细胞脊髓内源性神经干细胞运动训练

Influence of Cl substitution on the electronic structure and catalytic activity of ceria

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Science China Chemistry 2015年第4期58卷 601-606页

作者： li-li Yin Xue-qing Gong Key Laboratory for Advanced Materials Centre for Computational Chemistry and Research Institute of Industrial Catalysis East China University of Science and Technology

Cl-containing cerium dioxide(Ce O2) catalysts have been found to exhibit unique catalytic activities. In the present work, using density functional theory calculations with the inclusion of on-site Coulomb correction, we systematically studied the effect of Cl on the physicochemical properties of Ce O2 surfaces by substituting one subsurface O with Cl. The calculated results show that substituting an O atom with a Cl atom results in structural distortion and the reduction of one surface Ce4+ cation to Ce3+. The protruding Ce3+ cation greatly improves the adsorption energy of O2 to produce an active O2- species, and maintains the catalytic oxidation cycle of CO on Ce O2(110). These results may help us obtain a better understanding of Cl-ceria interacting systems and provide some guidance for the design of effective Ce O2-based catalysts.

关键词： cerium dioxide Cl substitution DFT+U O2 adsorption CO oxidation

对数动态骨架本构模型的多维实现及其在ABAQUS中的应用

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岩土工程学报 2025年第1期47卷 192-199页

作者：董青陈苏李小军董云陈亚东周正华朱俊淮阴工学院建筑工程学院江苏淮安223003 北京工业大学城建学部北京100124 南京工业大学交通运输工程学院江苏南京210009

对数动态骨架本构以对数函数作为骨架曲线,引入“修正动骨架曲线”和“阻尼比退化系数”的概念,考虑试验阻尼对滞回曲线的影响,实现试验阻尼和滞回阻尼在数学上自洽的非线性动力本构。该本构只适用于一维土层场地时域非线性地震反应分... 详细信息

对数动态骨架本构以对数函数作为骨架曲线,引入“修正动骨架曲线”和“阻尼比退化系数”的概念,考虑试验阻尼对滞回曲线的影响,实现试验阻尼和滞回阻尼在数学上自洽的非线性动力本构。该本构只适用于一维土层场地时域非线性地震反应分析。基于对数动态骨架本构函数关系式,给出对数动态骨架参数的求解方法,并推导出加卸载曲线的时变切线剪切模量。通过ABAQUS软件的操作平台和等效剪应变算法,开发了基于对数动态骨架本构模型的显式子程序模块,该模型适用于二维和三维土层场地非线性地震反应分析。选取含软弱淤泥质土层场地作为计算模型,将从基岩输入不同加速度峰值的EI centro地震动的数值模拟结果进行对比,验证可考虑土体阻尼效应的对数动态骨架本构以及开发子程序的合理性和可用性。

关键词：对数动骨架本构阻尼比场地地震反应时变切线剪切模量

The Security of Using Large Language Models:A Survey With Emphasis on ChatGPT

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 1-26页

作者： Wei Zhou Xiaogang Zhu qing-Long Han lin li Xiao Chen Sheng Wen Yang Xiang the School of Science Computing and Engineering Technologies Swinburne University of Technology IEEE the School of Computer and Mathematical Sciences the University of Adelaide Adelaide the Faculty of Science and Engineering Southern Cross University the School of Information and Physical Sciences the University of Newcastle

ChatGPT is a powerful artificial intelligence(ai)language model that has demonstrated significant improvements in various natural language processing(NLP) tasks. However, like any technology, it presents potential security risks that need to be carefully evaluated and addressed. In this survey, we provide an overview of the current state of research on security of using ChatGPT, with aspects of bias, disinformation, ethics, misuse,attacks and privacy. We review and discuss the literature on these topics and highlight open research questions and future *** this survey, we aim to contribute to the academic discourse on ai security, enriching the understanding of potential risks and mitigations. We anticipate that this survey will be valuable for various stakeholders involved in ai development and usage, including ai researchers, developers, policy makers, and end-users.

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