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Encapsulating perovskite quantum dots into 3D COF for visible light-driven CO2 reduction

Science China Chemistry 2025年

作者： Xinxin Wang Yucheng Jin Xiya Yang qingyu Luan Tianyu Wang Dongdong qi Kang Wang Jianzhuang Jiang College of Chemistry and Materials Science Anhui Normal University Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials Department of Chemistry and Chemical Engineering School of Chemistry and Biological EngineeringUniversity of Science and Technology Beijing

Lead halide perovskite quantum dots（LHP QDs） have been revealed to possess great potential in photocatalytic applications including CO2reduction, which however suffer from poor stability. Herein, a high crystalline hydrazine-linked three-dimensional（3D） covalent organic framework, USTB-17, was fabricated from the reaction between 12-connected building block and 4-connected 3,5,7-tetrakis（4-aldophenyl）-adamantane. Post-modification with Ni2+affords the metallic framework USTB-17（Ni）followed by sequential deposition of the CH3NH2PbI3（MAPbI3） perovskite QDs into its pores, generating the USTB-17（Ni）@MAPbI3composite. Powder X-ray diffraction analysis together with theoretical simulations and transmission electron microscopy discloses the crystalline nature of USTB-17, USTB-17（Ni）, and USTB-17（Ni）@MAPbI3with an unprecedented noninterpenetrated hpt topology. The close contact of QDs inside the COF pores with the Ni catalytic site locating at the pore surface of COF allows a rapid transfer of the photogenerated electrons in QDs to the Ni catalytic sites, enhancing the photocatalytic activity for CO2reduction. This endows USTB-17（Ni）@MAPbI3with efficient photocatalysis performance for photocatalytic CO2reduction with CO generation rate of 365 μmol g-1h-1and CO selectivity up to 96% under visible-light irradiation, 7 times higher than that of USTB-17（Ni）. After four cycles of reactions, the photocatalytic CO generation rate remains almost unchanged, demonstrating its excellent cycle stability.

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基于世界模拟的政治非稳态:Sora的智能影像生成与历史重塑

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新疆师范大学学报（哲学社会科学版） 2025年第2期46卷 70-78页

作者：高奇琦台润泽华东政法大学政府管理学院上海201620 华东政法大学政治学研究院上海201620

OpenAI发布的文字转视频模型Sora在智能影像生成领域取得突破,被认为具备“世界模拟”能力。这种对现实物理世界的逼真模拟能力,引发人类对“真实性”的重新评估。通过模拟现实场景和历史事件,Sora在展示其应用潜力的同时,对真实性、历... 详细信息

OpenAI发布的文字转视频模型Sora在智能影像生成领域取得突破,被认为具备“世界模拟”能力。这种对现实物理世界的逼真模拟能力,引发人类对“真实性”的重新评估。通过模拟现实场景和历史事件,Sora在展示其应用潜力的同时,对真实性、历史真相和公众信任等带来挑战。文本介绍了Sora的技术背景,探讨了智能影像与虚假信息结合的风险。这一结合可能通过社会媒介影响公众信念和政治秩序,引发社会极化和分化。此外,在重塑历史记忆与认同时,可能导致信息的扭曲和伪造问题,或将社会推向政治非稳态。为应对技术带来的挑战,文本强调在迈向通用人工智能时代的过程中平衡技术创新与社会责任的重要性。通过深入分析Sora等智能影像生成的可能影响与挑战,提醒社会关注生成式人工智能技术的监管和伦理,确保技术发展的同时维护历史的真实性,保障社会福祉。

关键词： Sora 智能影像生成人工智能政治秩序

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Global Regularity for a 2D Model of Electro-Kinetic Fluid in a Bounded Domain

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Acta Mathematicae Applicatae Sinica 2018年第2期34卷 398-403页

作者： Miao-chao CHEN Sheng-qi LU qi-lin LIU School of Applied Mathematics Chaohu University Anhui 238000 China Department of Mathematics and Physics Sanjiang University Jiangsu 210012 China School of Mathematics Southeast University Jiangsu 211189 China

In this paper, we consider an initial boundary value problem for a 2D model of electro-kinetic fluid in a smooth and bounded domain. We prove that the model has a unique global-in-time smooth solution.

关键词： euler equations electro-hydrodynamics global regularity

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Microbial Community Structure and Enzyme Activities in a Sequence of Copper-Polluted Soils

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Pedosphere 2011年第2期21卷 164-169页

作者： GE chao-Rong ZHANG qi-Chun Laboratory of Clinical Microbiology The First Affiliated Hospital of College of Medicine Zhejiang University Hangzhou 310003(China) Zhejiang Provincial Key Laboratory of Subtropic Soil and Plant Nutrition Zhejiang University Hangzhou 310029 (China)

The microbial community structure and enzyme activities of seven paddy soils with different Cu concentrations were investigated in the vicinity of a Cu smelter in Fuyang County, Zhejiang Province in Southeast China. The microbial community structure was analyzed using the phospholipid fatty acid （PLFA） and multiplex-terminal restriction fragment length polymorphism （M-TRFLP） techniques. There was no clear dose-response relationship between Cu pollution and soil enzyme activity except for urease. Both PLFA and M-TRFLP methods showed that Cu contamination had a large effect on the soil microbial community structure. PLFA indicators of Gram-positive bacteria （16：0i, 15：0i） and fungi （18：2w6,9） relatively decreased with increasing Cu concentration, whereas indicators of Gram-negative bacteria （19：0cy, 16：1w7） increased. The M-TRFLP results suggested that there was a dose-dependent response between Cu pollution and bacterial community or fungal community. The fungal community was more sensitive to Cu pollution than the bacterial community. Therewere no significant differences in archaeal community structure between the different Cu pollution plots and axchaea might be more tolerant to Cu pollution than both bacteria and fungi.

关键词： axchaea bacteria fungi multiplex-terminal restriction fragment length polymorphism phospholipid fatty acid

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Mechanism and kinetics of the production of hydroxymethyl hydroperoxide in ethene/ozone/water gas-phase system

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Science China Chemistry 2007年第3期50卷 425-431页

作者： qi Bin chao YuTao CHEN ZhongMing School of Chemistry and Material Sciences Shaanxi Normal UniversityXi’an 710062China State Key Laboratory of Environmental Simulation and Pollution Control Peking UniversityBeijing 100871China

The mechanism and kinetics of the production of hydroxymethyl hydroperoxide (HMHP) in ethene/ozone/water gas-phase system were investigated at room temperature (298±2 K) and atmospheric pressure (1×105 Pa). The reactants were monitored in situ by long path FTIR spectroscopy. Peroxides were measured by an HPLC post-column fluorescence technique after sampling with a cold trap. The rate constants (k 3) of reaction CH2O2+H2O→HMHP (R3) determined by fitting model calculations to experimental data range from (1.6?6.0)×10?17 cm3·molecule?1·s?1. Moreover, a theoretical study of reaction (R3) was performed using density functional theory at QCISD(T)/6-311+(2d,2p)//B3LYP/6-311+G(2d,2p) level of theory. Based on the calculation of the reaction potential energy surface and intrinsic reaction coordinates, the classic transitional state theory (TST) derived k 3 (k TST), canonical variational transition state theory (CVT) derived k 3 (k CVT), and the corrected k CVT with small-curvature tunneling (k CVT/SCT) were calculated using Polyrate Version 8.02 program to be 2.47×10?17, 2.47×10?17 and 5.22×10?17 cm3·molecule?·s?1, respectively, generally in agreement with those fitted by the model.

关键词： ethane ozone rate constant HMHP density functional theory

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Graphene-anchored sodium single atoms:A highly active and stable catalyst for transesterification reaction

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Nano Research 2024年第6期17卷 4979-4985页

作者： song-song Peng Yao Nian Xing-Ru song Xiang-Bin Shao Chen Gu Zhi-Wei Xing Shi-chao qi Peng Tan You Han Xiao-qin Liu Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech University30 South Puzhu RoadNanjing 211816China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Solid strong base catalysts have received considerable attention in various organic reactions due to their facile separation,neglectable corrosion,and environmental *** great progress has been made in the preparation of solid strong base catalysts,it is still challenging to avoid basic sites aggregation on support and active sites loss in reaction ***,we report a tandem redox strategy to prepare Na single atoms on graphene,producing a new kind of solid strong base catalyst(Na1/G).The base precursor NaNO_(3)was first reduced to Na2O by graphene(400℃)and successively to single atoms Na anchored on the graphene vacancies(800℃).Owing to the atomically dispersed of basicity,the resultant catalyst presents high activity toward the transesterification of methanol and ethylene carbonate to synthesize dimethyl carbonate(turnover frequency(TOF)value:125.7 h^(−1)),which is much better than the conventional counterpart Na2O/G and various reported solid strong bases(TOF:1.0-90.1 h^(−1)).Furthermore,thanks to the basicity anchored on graphene,the Na1/G catalyst shows excellent durability during *** work may provide a new direction for the development of solid strong base catalysts.

关键词： solid strong base catalyst basic sites redox graphene single Na atoms

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Synthesis of ACE tricyclic systems of daphnicyclidin A and dehy-droxymacropodumine A

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Chinese Chemical Letters 2020年第7期31卷 1906-1910页

作者： qi Wang chao Zhang Jun Yang Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry Key Laboratory of Macromolecular Science of Shaanxi ProvinceSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityChang'an CampusXi'an 710119China

The synthesis of the ACE tricyclic system of daphnicyclidin A and dehydroxymacropodumine A are *** key reactions include an efficient aldol reaction to introduce chiral fragment 33 for further construction of piperidine ring B and seven-membered ring C, a nucleophilic addition of lithium pentene to aldehyde for installation of ring E,and a photocatalytic decarboxylation conjugate addition to construct ring C.

关键词： Tricyclic system Daphnicyclidin A Dehydroxymacropodumine A Photocatalytic decarboxylation Conjugate addition

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均值漂移优化的粒子滤波目标跟踪方法

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黑龙江工程学院学报 2014年第5期28卷 35-38页

作者：初红霞司金龙宋起超于浩洋韩晶张鹏秦杰黑龙江工程学院电气与信息工程学院黑龙江哈尔滨150050

为了实现粒子集的有效传播,克服粒子滤波跟踪时的退化问题,提出尺度和方向自适应的均值移动优化粒子滤波目标跟踪算法。用改进的均值移动作为一种优化机制对粒子进行传播,使粒子能够有效分散和聚类,有效解决退化问题。最后将该方法应用... 详细信息

为了实现粒子集的有效传播,克服粒子滤波跟踪时的退化问题,提出尺度和方向自适应的均值移动优化粒子滤波目标跟踪算法。用改进的均值移动作为一种优化机制对粒子进行传播,使粒子能够有效分散和聚类,有效解决退化问题。最后将该方法应用到真实图像序列中,实验表明算法在性能和效率上有明显提高。

关键词：均值移动粒子滤波自适应跟踪

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Temporally Consistent Depth Map Prediction Using Deep Convolutional Neural Network and Spatial-Temporal Conditional Random Field

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Journal of Computer Science & Technology 2017年第3期32卷 443-456页

作者： Xu-Ran Zhao Xun Wang qi-chao Chen School of Computer and Information Engineering Zhejiang Gongshang University Hangzhou 310018 China

Deep convolutional neural networks （DCNNs） based methods recently keep setting new records on the tasks of predicting depth maps from monocular images. When dealing with video-based applications such as 2D （2-dimensional） to 3D （3-dimensional） video conversion, however, these approaches tend to produce temporally inconsistent depth maps, since their CNN models are optimized over single frames. In this paper, we address this problem by introducing a novel spatial-temporal conditional random fields （CRF） model into the DCNN architecture, which is able to enforce temporal consistency between depth map estimations over consecutive video frames. In our approach, temporally consistent superpixel （TSP） is first applied to an image sequence to establish the correspondence of targets in consecutive frames. A DCNN is then used to regress the depth value of each temporal superpixel, followed by a spatial-temporal CRF layer to model the relationship of the estimated depths in both spatial and temporal domains. The parameters in both DCNN and CRF models are jointly optimized with back propagation. Experimental results show that our approach not only is able to significantly enhance the temporal consistency of estimated depth maps over existing single-frame-based approaches, but also improves the depth estimation accuracy in terms of various evaluation metrics.

关键词： depth estimation temporal consistency convolutional neural network conditional random fields

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The Effect of Heating Direction on Flow Boiling Heat Transfer of R134a in Microchannels

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Journal of Thermal Science 2017年第2期26卷 166-174页

作者： XU Mingchen JIA Li DANG chao PENG qi Institute of Thermal Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale Beijing 100044China

This paper presents effects of heating directions on heat transfer performance of R134 a flow boiling in micro-channel heat sink. The heat sink has 30 parallel rectangular channels with cross-sectional dimensions of 500mm width 500mm depth and 30 mm length. The experimental operation condition ranges of the heat flux and the mass flux were 13.48 to 82.25 W/cm^2 and 373.3 to 1244.4 kg/m^2 s respectively. The vapor quality ranged from 0.07 to 0.93. The heat transfer coefficients of top heating and bottom heating both were up to 25 k W/m^2 K. Two dominate transfer mechanisms of nucleate boiling and convection boiling were observed according to boiling curves. The experimental results indicated that the heat transfer coefficient of bottom heating was 13.9% higher than top heating in low heat flux, while in high heat flux, the heat transfer coefficient of bottom heating was 9.9%.higher than the top heating, because bubbles were harder to divorce the heating wall. And a modified correlation was provided to predict heat transfer of top heating.

关键词： top heating bottom heating flow boiling micro-channels R134a correlation

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