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Analysis of PM2.5 and O3 Pollution Causes in Hangzhou Based on High-resolution Enhanced Observation During the Asian Games

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Huanjing Kexue/Environmental Science 2025年第3期46卷 1302-1313页

作者： Yan, Ren-Chang Lai, Yong Zhang, Tian Jin, Jia-Jia Lin, Xu Wang, Yun-Yun shuai, qi-fan Fei, Luo-Lan Shen, Jian-Dong Ye, Xuhong Zhu, Shu-Hui Hangzhou Ecological Environment Monitoring Center of Zhejiang Hangzhou310007 China Shanghai Academy of Environmental Sciences Shanghai200003 China

Based on the high-resolution enhanced observation data of PM2.5 organic molecular tracers,aldehydes and ketone OVOC components,long-chain alkane IVOC components,and key species of atmospheric oxidation during September 1 to October 27,2023,the causes of PM2.5 and O3 pollution in Hangzhou were analyzed. Seven pollution processes were selected with the average daily concentration of PM2.5 exceeding 35 µg·m-3 or the maximum 8-hour concentration of O3 exceeding 160 µg·m-3. Then,these pollution processes were divided into four types:north-northeast transmission type(T1),east-southeast transmission type(T2),north-northwest transmission type(T3),and statically stable type(T4)by airflow trajectory. The research results indicated that the T2 pollution process exhibited strong PM2.5 and O3 composite pollution characteristics and the photochemical oxidation reaction of active VOC components,such as long-chain alkanes and terpenes in the atmospheric environment was the major pollution cause of this type. In the process of T1 and T3 pollution,the overall reactivity of VOCs was low,resulting in relatively weak O3 generation. However,the causes of PM2.5 in these two types of pollution processes were different. T1 pollution was affected by low temperature and high humidity meteorological conditions and the enhanced liquid-phase oxidation process led to a significant increase in nitrate concentration. T3 pollution was significantly affected by emissions from coal combustion,biomass combustion,and other sources,with a relatively high proportion of primary components in PM2.5. The T4 pollution process was significantly affected by local primary anthropogenic emissions,thus the control of local catering source and mobile source emissions must be strengthened. © 2025 Science Press. All rights reserved.

关键词： Coal combustion

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The effect of fine grits and fine debris concentrations on the MLVSS/MLSS ratio of an activated sludge system

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Journal of Environmental Sciences 2025年第1期147卷 607-616页

作者： Zhao Jiang Zhiheng Xia shuai Liu qiWei Haitao fan Lu qi Guohua Liu Hongchen Wang Low-carbon Water Environment Technology Research Center School of Environment&Natural ResourcesRenmin University of ChinaBeijing 100872China

This study embarks on an explorative investigation into the effects of typical concentrations and varying particle sizes of fine grits(FG,the involatile portion of suspended solids)and fine debris(FD,the volatile yet unbiodegradable fraction of suspended solids)within the influent on themixed liquor volatile suspended solids(MLVSS)/mixed liquor suspended solids(MLSS)ratio of an activated sludge *** meticulous experimentation,it was discerned that the addition of FG or FD,the particle size of FG,and the concentration of FD bore no substantial impact on the pollutant removal efficiency(denoted by the removal rate of COD and ammonia nitrogen)under constant operational ***,a notable decrease in the MLVSS/MLSS ratio was observed with a typical FG concentration of 20 mg/L,with smaller FG particle sizes exacerbating this ***,variations in FD concentrations influenced both MLSS andMLVSS/MLSS ratios;a higher FD concentration led to an increased MLSS and a reduced MLVSS/MLSS ratio,indicating FD accumulation in the system.A predictive model for MLVSS/MLSS was constructed based on quality balance calculations,offering a tool for foreseeing the MLVSS/MLSS ratio under stable long-term influent conditions of FG and *** model,validated using data from the BXH wastewater treatment plant(WWTP),showcased remarkable accuracy.

关键词： Fine grits and fine debris Activated sludge system MLVSS/MLSS ratio Predictive model

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ANALYSIS ON THE ELECTROMECHANICAL FIELDS IN A PIEZOELECTRIC SEMICONDUCTING NANOWIRE UNDER TORQUE DEFORMATION

ANALYSIS ON THE ELECTROMECHANICAL FIELDS IN A PIEZOELECTRIC ...

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2016年全国压电和声波理论及器件应用研讨会

作者： Zhi-jian CUI Yuan-tai HU shuai-qi fan College of Petroleum Engineering Xi'an Shiyou University Department of Mechanics Huazhong University of Science and Technology

Background, Motivation and Objective Recently, much attention has been focused on piezoelectric semiconductors with the wurtzite construction, including Zn O, Ga N, In N, and Zn S, etc. Due to coupling of piezoelectric and semiconducting properties, nanowires and microwires of piezoelectric semiconductors have been used as basic building blocks for fabricating innovative devices, for example nanogenerators, piezoelectric diodes, piezoelectric field-effect transistors, piezoelectric chemical sensors, and piezo-phototropic devices. In general, when an open-circuit piezoelectric semiconducting structure is subjected to tension/compression, twist or bend deformations, redistribution of carriers will appear in the structure and a lot of electric charges will be accumulated on its surfaces;conversely, when a piezoelectric semiconducting structure is subjected to a voltage, there appear mechanically deformations together with redistribution of carriers. The above two phenomena are governed by the electromechanical coupling equations and the current movement equation. In this paper, we will discuss the electric potential, electric field, electric displacement distribution characteristics in a piezoelectric semiconducting nanowire(PSN) under the action of a torque. Statement of Contribution/Methods By assuming the PSN as transversely isotropic, the shear stress and strain components in the cross section of a PSN can be obtained in advance from the classical material mechanics, while the vanished curl of static electric fields has been used in the solution process. Based on the obtained shear stress and strain components, the electric potential, the electric field and the electric displacement in the PSN can be found from the piezoelectric governing equation. At the same time, the governing equation of carrier concentration can be deduced from the current balance condition. Finally, with the help of MATLAB, we calculate the distribution characteristics of electric potential,

关键词： Piezoelectric semiconductor Piezoelectric potential Carrier concentration

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Accumulation characteristics and fate modeling of phthalic acid esters in surface water from the Three Gorges Reservoir area,China

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Journal of Environmental Sciences 2025年第3期149卷 46-56页

作者： shuai Sun Bing Zhang Junjie Hu Wen Gu ZhenWang Deling fan Feng Ge Lili Shi LeiWang Nanjing Institute of Environmental Science Ministry of Ecology and Environment of the People’s Republic of ChinaNanjing 210042China Key Laboratory of Pesticide Environmental Assessment and Pollution Control Ministry of Ecology and Environment of the People’s Republic of ChinaNanjing 210042China Solid Waste and Chemicals Management Center Ministry of Ecology and Environment of the People’s Republic of ChinaBeijing 100029China

Phthalic acid esters(PAEs)are a group of compounds widespread in the *** investigate the occurrence and accumulation characteristics of PAEs,surface water samples were collected from the Three Gorges Reservoir area,*** total concentrations of∑_(11)analyzed PAEs(11PAEs)in the collected water samples ranging from 197.7 to 1,409.3 ng/L(mean±IQR:583.1±308.4 ng/L).While DEHP was the most frequently detected PAE,DnBP and DnNP were the most predominant PAEs in the analyzed water samples with a mean contribution of 63.3%of the∑_(11)*** concentrations of the∑_(11)PAEs in the water samples from the upper reaches of the Yangtze River were significantly higher than those from themiddle *** better understand the transport and fate of the PAEs,seven detected PAEs were modeled by Quantitative Water Air Sediment Interaction(QWASI).The simulated and measured values were close for most PAEs,and differences are within one order of magnitude even for the worst *** all simulated PAEs,water and particle inflow were main sources in the reservoir,whereas water outflow and degradation in water were important removal *** contribution ratios of different sources/losses varied fromPAEs,depending on their *** calculated risk quotients of DnNP in the Three Gorges Reservoir area whether based onmonitoring or simulating results were all far exceeded the safety threshold value,implying the occurrence of this PAE compound may cause potential adverse effects for the aquatic ecology of the Three Gorges Reservoir area.

关键词： Phthalic esters Surface water Transport and fate Three Gorges Reservoir area Risk assessment

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Single-cell technologies: current and near future

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Science China(Life Sciences) 2025年第1期68卷 1-4页

作者： Chenfei Wang qi Liu Xiaohui fan Tieliu Shi KeyLaboratory of Spine and Spinal CordInjury Repairand Regeneration Ministry of EducationOrthopedics DepartmentTongji HospitalBioinformatics DepartmentSchoolofLifeSciencesandTechnologyTongji UniversityShanghai 200082China Frontier Science Center for Stem Cells School of Life Sciences and TechnologyTongji UniversityShanghai 200092China Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine Shanghai East HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji UniversityShanghai 200082China Research Institute of Intelligent Computing Zhejiang LabHangzhou 311121China Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China National Key Laboratory of Chinese Medicine Modernization Innovation Center of Yangtze River DeltaZhejiang UniversityJiaxing 314103China Center for Bioinformatics and Computational Biology Shanghai Key Laboratory of Regulatory Biologythe Institute of Biomedical Sciences and School of Life SciencesEast China Normal UniversityShanghai 200241China Key Laboratory of Advanced Theory and Application in Statistics and Data Science(MOE) School of StatisticsEast China Normal UniversityShanghai 200062China

Single-cell technologies enable the indepth exploration of multiple biological hierarchies at the scale of individual cells,which have deepened our knowledge of cellular diversity,tissue organization,and overall organism function(Sun et al.,2024).In 2009,single-cell RNA sequencing(scRNA-seq)was first developed as a powerful tool to dissect gene expression and uncover transcriptional *** the rapid advancement of technology,single-cell approaches have expanded to encompass other omics,such as genomics,epigenomics,proteomics,and ***,multimodal technologies including spatially resolved transcriptomics and clustered regularly interspaced short palindromic repeats(CRISPR)screening at the single-cell level further advanced our ability to comprehensively understand cellular ***-cell methods provide deeper insights into disease mechanisms across various conditions,including cancer,developmental disorders,and aging-associated *** this issue,we focus on topics related to single-cell methods,covering the following four aspects:(i)single-cell multi-omic sequencing technology;(ii)single-cell spatial technology;(iii)singlecell CRISPR screening technology;(iv)applications of single-cell technology.

关键词： expanded enable insight

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Visible light excitation on CuPd/TiN with enhanced chemisorption for catalyzing Heck reaction

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Chinese Chemical Letters 2025年第1期36卷 362-368页

作者： Xuhui fan fan Wang Mengjiao Li Faiza Meharban Yaying Li Yuanyuan Cui Xiaopeng Li Jingsan Xu qi Xiao Wei Luo State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China National Energy R&D Center for Coal to Liquid Fuels Synfuels China Technology Co.Ltd.Beijing 101407China Shimadzu(China)Co. Ltd.Shanghai 200233China School of Chemistry and Physics&Centre for Materials Science Queensland University of TechnologyBrisbaneQLD 4001Australia

In this work,we developed plasmonic photocatalyst composed of Cu Pd alloy nanoparticles supported on Ti N,the optimized Cu_(3)Pd_(2)/Ti N catalyst shows excellent conversion(>96%)and selectivity(>99%)for Heck reaction at 50℃ under visible light *** in-situ spectroscopic investigations,we find that visible light excitation could achieve stable metallic Cu species on the surface of Cu Pd alloy nanoparticles,thereby eliminating the inevitable surface oxides of Cu based *** in-situ formed metallic Cu species under irradiation take advantage of the strong interactions of Cu with visible light,and manifest in the localized surface plasmon resonances(LSPR)*** light excitation could further promote the charge transfer between catalytic Pd component and the support Ti N,resulting in electron-rich Pd sites on Cu Pd/Ti ***,light excitation on Cu Pd/Ti N generates strong chemisorption of iodobenzene and styrene,favoring the activation of reactants for Heck *** calculations suggest that electron-rich Cu Pd sites ideally lower the activation energy barrier for the coupling *** work provides valuable insights for mechanistic understanding of plasmonic photocatalysis.

关键词： Photocatalysis CuPd alloy Chemisorption Photocatalytic mechanism LSPR

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Biomimetic proton pocket and effective interfacial modulation for zinc metal anodes

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Science China Chemistry 2025年第2期68卷 526-535页

作者： qi Dong qingshun Nian Xuan Luo Jiajia fan Jinyu Jiang Zhuangzhuang Cui Digen Ruan Xiaodi Ren Hefei National Research Center for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

Rechargeable aqueous zinc batteries(RAZBs)offer a promising solution for large-scale energy storage due to the abundance,low cost,and safety of ***,practical applications are hindered by Zn anode instability,dendrite growth,and hydrogen evolution reactions(HER).Chaotropic Zn(ClO_(4))2 electrolytes are favorable for low-temperature operations but exacerbate these issues due to their high acidity,leading to severe Zn corrosion and layered double hydroxide *** propose a biomimetic strategy using methylguanidoacetic acid(creatine)as a low-cost,eco-friendly additive to address these *** acts as a proton pocket to finely tune the pH of acidic Zn(ClO_(4))2 electrolytes for suppressing HER and stabilizing the Zn ***,the formed creatinine cations adsorb on the Zn surface,promoting highly controlled Zn deposition with a preferred(002)*** approach significantly enhances battery cycling performance,with Zn||Zn cells demonstrating extended cycling stability at both low and high current ***||Cu cells exhibited improved Coulombic efficiency over thousands of cycles,indicating highly reversible Zn plating/***,stable cell operations were realized at the temperature as low as−35℃ without electrolyte *** findings highlight the potential of biomimetic proton regulation and interfacial modulation for improving the stability and reversibility of Zn plating/stripping in RAZBs.

关键词： zinc metal anode dendrite suppression interfacial modulation proton-triggered cyclization Zn(ClO_(4))2 electrolyte

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Accurate visualization colorectal cancer by monitoring viscosity variations with a novel mitochondria-targeted fluorescent probe

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Chinese Chemical Letters 2025年第2期36卷 319-322页

作者： fan Zheng Runsha Xiao shuai Huang Zhikang Chen Chen Lai Anyao Bi Heying Yao Xueping Feng Zihua Chen Wenbin Zeng Xiangya School of Pharmaceutical Sciences Central South University Hunan Key Laboratory of Diagnostic and Therapeutic Drug Research for Chronic Diseases Central South University Department of General Surgery Xiangya Hospital Central South University Hunan Key Laboratory of Precise Diagnosis and Treatment of Gastrointestinal Tumor Xiangya Hospital Central South University National Clinical Research Center for Geriatric Disorders Xiangya Hospital Central South University Department of Oncology Xiangya Hospital Central South University Department of Otolaryngology-head and Neck Surgery and Institute of Medical Sciences Xiangya Hospital Central South University

Colorectal cancer(CRC) is one of the most prevalent malignant tumors worldwide, exhibiting high morbidity and mortality. Lack of efficient tools for early diagnosis and surgical resection guidance of CRC have been a serious threat to the long-term survival rate of the CRC patients. Recent studies have shown that relative higher viscosity was presented in tumor cells compared to that in normal cells, leading to viscosity as a potential biomarker for CRC. Herein, we reported the development of a series of novel viscosity-sensitive and mitochondria-specific fluorescent probes(HTB, HTI, and HTP) for CRC *** them, HTB showed high sensitivity, minimal background interference, low cytotoxicity, and significant viscous response capability, making it an ideal tool for distinguishing colorectal tumor cells from normal cells. Importantly, we have successfully utilized HTB to visualize in a CRC-cells-derived xenograft(CDX) model, enriching its medical imaging capacity, which laid a foundation for further clinical translational application.

关键词： Bioimaging Cancer diagnosis Colorectal cancer Fluorescent probe Mitochondrial-targeted Viscosity

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Immune cells:potential carriers or agents for drug delivery to the central nervous system

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Military Medical Research 2025年第1期12卷 121-153页

作者： Shan-Shan Zhang Ruo-qi Li Zhong Chen Xiao-Ying Wang Aaron S.Dumont Xiang fan School of Basic Medical Sciences Zhejiang Chinese Medical UniversityHangzhou 310053China Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province Zhejiang Chinese Medical UniversityHangzhou 310053China Clinical Neuroscience Research Center Department of Neurosurgery and NeurologyTulane University School of MedicineNew OrleansLA 70122USA

Drug delivery systems(DDS)have recently emerged as a promising approach for the unique advantages of drug protection and targeted ***,the access of nanoparticles/drugs to the central nervous system(CNS)remains a challenge mainly due to the obstruction from brain *** cells infiltrating the CNS in the pathological state have inspired the development of strategies for CNS foundation drug ***,we outline the three major brain barriers in the CNS and the mechanisms by which immune cells migrate across the blood–brain *** subsequently review biomimetic strategies utilizing immune cell-based nanoparticles for the delivery of nanoparticles/drugs to the CNS,as well as recent progress in rationally engineering immune cell-based DDS for CNS ***,we discuss the challenges and opportunities of immune cell-based DDS in CNS diseases to promote their clinical development.

关键词： Drug delivery systems Immune cells Blood-brain barrier Central nervous system

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A Highly Sensitive Electrochemical Aptasensor for Kanamycin:Leveraging RecJf Exonuclease-Assisted Target Recycling and Hybridization Chain Reaction Signal Amplification

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Journal of Analysis and Testing 2025年第01期 96-108页

作者： qi Xiao Dongyou Zhang Mingli Yang shuai Liu Yi fang Shan Huang Guangxi Key Laboratory of Natural Polymer Chemistry and Physics College of Chemistry and MaterialsNanning Normal University

A highly sensitive electrochemical aptasensor was developed for the detection of kanamycin, employing a DNA signal amplification strategy that combines RecJf exonuclease-assisted target recycling with a hybridization chain reaction(HCR).The sensing platform is constructed by covalently immobilizing double-stranded DNA(dsDNA) comprised of a kanamycin-specific aptamer and its thiol-modified complementary strand(SH-CDNA) onto a gold electrode. In the presence of kanamycin and RecJf exonuclease, the aptamer selectively binds to kanamycin, dissociating from the dsDNA complex. The RecJf exonuclease then cleaves the aptamer, releasing kanamycin and initiating a cycle of repetitive binding and *** residual SH-CDNA on the electrode triggers an HCR between two types of ferrocene-labeled hairpin DNA, forming an elongated stable dsDNA nanostructure. This results in an amplified electrochemical signal proportional to the logarithm of kanamycin concentration over a range of 0.01–10 nmol/L, with a remarkable detection limit of 1.8 pmol/L. The aptasensor's performance was validated by analyzing spiked kanamycin in pharmaceutical eye drops and milk samples, yielding recovery rates between 95.6% and 104.8% and relative standard deviations from 1.4% to 4.2%. With its exceptional selectivity and sensitivity, this aptasensor offers a compelling alternative to traditional HPLC for rapid on-site detection of *** on the specificity of aptamers, the sensor design presented herein serves as a valuable blueprint for engineering detectors of other molecules, with significant implications for analytical chemistry and food safety monitoring.

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