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Photophysical Behaviors of Azobenzene in Solvent-Swollen Nafion Membranes

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Chinese Chemical Letters 1996年第10期7卷 944-947页

作者： guan, jq Tung, CH ACAD SINICA INST PHOTOG CHEMBEIJING 100101PEOPLES R CHINA

The fluorescence from azobenzene (AB) molecule incorporated into water-swollen Nafion in acid form was observed at room temperature for the first time. The incorporation process was investigated by UV absorption. The plot of the concentration of AB in Nafion vs. the soaking time shows that the adsorption process is diffusion-controlled, and the apparent diffusion coefficient (D) was determined to be 7.6x10(-10) cm(2)s(-1). These results are attributed to the fact that AB molecules are located in the fluorocarbon/water interface of the Nafion membranes and are protonated. In methanol-swollen Nafion membranes, AB fails to fluoresce because it is located at the methanol pool enclosed by the cluster networks.

关键词： Photophysical Behaviors of Azobenzene in Solvent-Swollen Nafion Membranes

Flexible High Energy Density Sodium Dual-ion Battery with Long Cycle life

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Energy & Environmental Materials 2022年第4期5卷 1285-1293页

作者： Yongpeng Li Qun guan Jianli Cheng Bin Wang Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Institute of Fundamental and Frontiers Sciences Yangtze Delta Region Institute(Huzhou)University of Electronic Sciences and Technology of ChinaChengdu 611731China

Flexible fiber-shaped sodium dual-ion batteries(FSDIBS)as a proof of concept are fabricated by using the hierarchical ReS_(2) nanosheets anchored on the carbon nanotube(ReS_(2)@CNT)fiber as anode and graphite on the CNT as *** to large interlayer spacing and weak layer coupling force of the ReS_(2) nanosheets and the anion accommodation of the graphite combined with good flexibility of the CNT fiber,the FSDIBS demonstrate outstanding electrochemical performances with high working voltage and high specific volumetric energy density,durable cycling life,and good *** FSDIBS show a specific discharge capacity of 97.8 mAh cm^(−3) at a current density of 630 mA cm^(−3) and high specific energy density of 25.12 mWh cm^(−3)(based on the whole volume of the two electrodes)and superb stability with a capacity retention of 91.8%even after bending for 2100 ***,a series of ex situ/in situ characterizations are verified that the reversible shuttles of the Na^(+) cations and PF_(6)^(-) anions between the anode and cathode are simultaneously occurred during the charge/discharge process.

关键词： dual-ion batteries fiber-shaped flexibility ReS_(2) sodium ions

Porous CoF2 Spheres Synthesized by a One-Pot Solvothermal Method as High Capacity Cathode Materials for Lithium-Ion Batteries

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Chinese Journal of Chemistry 2017年第1期35卷 48-54页

作者： Qun guan Jianli Cheng Xiaodong Li Bin Wang Institute of Chemical Materials China Academy of Engineering Physics Mianyang Sichuan 621900 China Sichuan R &D Center of New Materials Mianyang Sichuan 621900 China

Up to now, there are rare reports of CoF2 spheres used as high capacity cathode materials. Herein, porous CoF2 spheres were synthesized and studied as cathode materials for LIBs. The porous CoF2 spheres were synthesized by a facile one-pot solvothermal method using a safe and inexpensive ammonium fluoride as the fluorine sources. The nature of the synthesis can avoid using corrosive fluorine sources and additional high-temperature thermal treatment The structure, morphologies and electrochemical performance of the samples obtained at different reaction times and solvothermal temperatures were investigated. The results show that the CoF2 spheres obtained at 200 ℃ for 20 h show better electrochemical performances, including a high initial discharge capacity, good capacity retention and high Coulombic efficiency. It can deliver a high initial discharge capacity of 537.8 mAoh·g-1 and keep 127.4 mA·h.g- 1 after 30 cycles used as cathode materials for lithium-ion batteries. The good electrochemical performances may be attributed to good crystallinity, porous structure and relatively intermediate sphere size.

关键词： CoF2 sphere solvothermal method cathode materials lithium-ion battery

Neutrophil diversity and plasticity:Implications for organ transplantation

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Cellular & Molecular Immunology 2023年第9期20卷 993-1001页

作者： Junwen Qu Jingsi Jin Ming Zhang Lai guan Ng Shanghai Immune Therapy Institute Renji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China Department of Urology Renji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China

Neutrophils,as the first defenders against external microbes and stimuli,are highly active and finely regulated innate immune *** evidence has challenged the conventional dogma that neutrophils are a homogeneous population with a short lifespan that promotes tissue *** findings on neutrophil diversity and plasticity in homeostatic and disease states have centered on neutrophils in the *** contrast,a comprehensive understanding of tissue-specialized neutrophils in health and disease is still *** article will first discuss how multiomics advances have contributed to our understanding of neutrophil heterogeneity and diversification in resting and pathological *** discussion will be followed by a focus on the heterogeneity and role of neutrophils in solid organ transplantation and how neutrophils may contribute to transplant-related *** goal of this article is to provide an overview of the research on the involvement of neutrophils in transplantation,with the aim that this may draw attention to an underappreciated area of neutrophil research.

关键词： Neutrophil Heterogeneity Transplantation

Water migration in subgrade soil under seasonal freeze-thaw cycles in an alpine meadow on the Qinghai-Tibet Plateau

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Journal of Mountain Science 2022年第6期19卷 1767-1781页

作者： WU guan-qing XIE Yong-li WEI Jin YUE Xia-bing School of Highway Chang'an UniversityXi'an 710064China

Highway frost heave and thawing settlement caused by water migration towards the freezing front and ice lens development is widespread in the alpine meadow area of the southeast QinghaiTibet Plateau(QTP). A laboratory experiment on a highway reconstruction and expansion project in the QTP was carried out in this work to analyze the effects of fine particle content, initial water content, and the number of freeze-thaw cycles(FTCs) on frost depth, temperature gradient(Grad T), total water intake, and water intake flux. Based on the results of the laboratory experiment, a modified model of migration potential related to fine particle content, freeze-thaw history, and freezing time was established. The results show that, with the increase of fine particle content, the frost depth of soil decreases, the curve of total water intake over time is transformed from an Sshape to an arch, and the curve of water intake flux over time is transformed from a peak shape to descending shape. The variation trend of migration potential with freezing time and the freeze-thaw history is the same as that of water intake flux with freezing time and freeze-thaw history. The variation trend of soil intake flux can be used as a reference to determine the variation trend of soil migration potential. This study provides a reference for the design and construction of highway subgrade in the alpine meadow area of the QTP.

关键词： Water migration Seasonally frozen ground Freeze-thaw cycles Laboratory experiment Migration potential model Qinghai-Tibet Plateau

Dynamics of ecosystem carbon stocks during vegetation restoration on the Loess Plateau of China

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Journal of Arid Land 2016年第2期8卷 207-220页

作者： WANG Kaibo DENG Lei REN Zongping SHI Weiyu CHEN Yiping SHANG-guan Zhouping State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of Sciences State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area Xi'an University of Technology

In the last few decades, the Loess Plateau had experienced an extensive vegetation restoration to reduce soil erosion and to improve the degraded ecosystems. However, the dynamics of ecosystem carbon stocks with vegetation restoration in this region are poorly understood. This study examined the changes of carbon stocks in mineral soil （0-100 cm）, plant biomass and the ecosystem （plant and soil） following vegetation restoration with different models and ages. Our results indicated that cultivated land returned to native vegetation （natural restoration） or artificial forest increased ecosystem carbon sequestration. Tree plantation sequestered more carbon than natural vegetation succession over decades scale due to the rapid increase in biomass carbon pool. Restoration ages had different effects on the dynamics of biomass and soil carbon stocks. Biomass carbon stocks increased with vegetation restoration age, while the dynamics of soil carbon stocks were affected by sampling depth. Ecosystem carbon stocks consistently increased after tree plantation regardless of the soil depth; but an initial decrease and then increase trend was observed in natural restoration chronosequences with the soil sampling depth of 0-100 cm. Moreover, there was a time lag of about 15-30 years between biomass production and soil carbon sequestration in 0-100 cm, which indicated a long-term effect of vegetation restoration on deeper soil carbon sequestration.

关键词： ages carbon stocks natural vegetation restoration tree plantation Loess Plateau

Preparation of a Novel Green Fluorescent Carbon Quantum Dots and Application in Fe^(3+)-Specific Detection in Biological System

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Journal of Analysis and Testing 2024年第1期8卷 40-51页

作者： Xianfen Zhang Wenxian Wang Lijiao guan Huajie Chen Dai Li Lipeng Zhang Saipeng Huang School of Chemical Engineering Northwest UniversityXi'an 710069China Chemical Technology Academy of Shandong Province Qingdao University of Science and TechnologyJinan250014China

Trace ferric ion(Fe^(3+))detection has attracted increasing attention as an essential and indispensable role in many physiological and pathological *** green-emitting carbon quantum dots(Green-CQDs)were obtained through a green and facile one-step hydrothermal method for the specific recognition and trace detection of Fe^(3+)in this *** optimal excitation and emission wavelengths of the CQDs were 395 nm and 490 nm,*** stokes shift was up to 95 nm,which can effectively reduce the background fluorescence *** addition,it also exhibited good water solubility,stability,and high *** fluorescence intensity of Green-CQDs was linearly related to the concentration of Fe^(3+)(range of 0-80μmol/L),and the detection limit was as low as 59 nmol/*** good properties were favorable and successful for Fe^(3+)detection in tap water,human serum samples and living *** addition,a fluorescence visual test paper(FP@CQDs)was prepared utilizing filter paper as carrier,which can quickly identify Fe^(3+)in real time,and is suitable for the visualization analysis of Fe^(3+)in *** an efficient nanoprobe,the Green-CQDs held great promise and bright prospects in practical application in prevention and early clinical diagnosis of Fe^(3+)-associated diseases.

关键词： Carbon quantum dots Fluorescent Hydrothermal Fe^(3+)-specific detection Cell imaging

Resilient distributed economic dispatch of a cyber-power system under DoS attack

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Frontiers of Information Technology & Electronic Engineering 2021年第1期22卷 40-50页

作者： Feisheng YANG Xuhui LIANG Xiaohong guan MOE Key Laboratory of Intelligent Network and Network Security Xi'an Jiaotong UniversityXi'an 710049China School of Automation Northwestern Polytechnical UniversityXVan 710129China

The economic dispatch problem of a smart grid under vicious denial of service(DoS)is the main focus of this *** the actual situation of power generation as a starting point,a new distributed optimization model is established which takes the environmentai pollution penalty into *** saving the limited bandwidth,a novel distributed event-triggered scheme is proposed to keep the resilience and economy of a class of cyber-power syst ems when the communication net work is subject to malicious DoS *** an improved multi-agent consensus protocol based on the gradient descent idea is designed to solve the minimization problem,and the prerequisites to minimize the system power generation cost are analyzed from the aspects of optimality and ***,the theoretical results are verified through a single-area 10-generat or unit simulation.

关键词： Economic dispatch Denial of service(DoS)attack Resilient event-triggered scheme Distributed optimization

Advances in the Emerging Gradient Designs of Li Metal Hosts

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Research 2022年第4期2022卷 741-756页

作者： Wanqing guan Xiaoqi Hu Yuhang Liu Jinmeng Sun Chen He Zhuzhu Du Jingxuan Bi Ke Wang Wei Ai Frontiers Science Center for Flexible Electronics(FSCFE) Xi'an Institute of Flexible Electronics(IFE)and Xian Institute of Biomedical Materials Engineering(IBME)Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'an710072China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingaporeSingapore 639798

Developing host has been recognized a potential countermeasure to circumvent the intrinsic drawbacks of Li metal anode(LMA),such as uncontrolled dendrite growth,unstable solid electrolyte interface,and infinite volume *** realize proper Li accommodation,particularly bottom-up deposition of Li metal,gradient designs of host materials including lithiophilicity and/or conductivity have attracted a great deal of attention in recent ***,a critical and specialized review on this quickly evolving topic is still *** this review,we attempt to comprehensively summarize and update the related advances in guiding Li nucleation and ***,the fundamentals regarding Li deposition are discussed,with particular attention to the gradient design principles of host ***,the progress of creating diferent gradients in terms of lithiophilicity,conductivity,and their hybrid is systematically ***,future challenges and perspective on the gradient design of advanced hosts towards practical LMAs are provided,which would provide a useful guidance for future studies.

关键词： conductivity unstable electrolyte