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How the microenvironment dominated by the distance effect to regulate the FeN_(4)site ORR activity and selectivity?

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Nano Research 2024年第6期17卷 5735-5741页

作者： Peng Li Qingfeng guo Jianrui Zhang Ruilin Chen Shujiang Ding Yaqiong su School of Chemistry Engineering Research Center of Energy Storage Materials and Devices of Ministry of EducationNational Innovation Platform(Center)for Industry-Education Integration of Energy Storage TechnologyXi’an Jiaotong UniversityXi’an 710049China Huanghe Science and Technology College Zhengzhou 450063China General Research Institute of Engineering of Gotion High-Tech Hefei 230041China

The distance effect of the doped heteroatoms away from the catalytic centers has rarely been *** this work,we conducted density functional theory calculations to thoroughly investigate the influence of heteroatom(N,P,B,and S atoms)doping distance on the oxygen reduction reaction(ORR)activity of graphene-based FeN_(4)*** uncovered a Sabatier-like relationship between heteroatom doping distance and ORR activity of FeN_(4)*** nearest doping does not significantly improve and even block the ORR activity of FeN_(4)*** ORR activity is achieved when the heteroatoms are 4-5Å(N,P,and S atoms)or 6-7Å(B atoms)away from the Fe *** of electronic structure indicates that distance effect can modulate the local chemical environment of Fe atoms,thereby account for the changes in ORR activity along with the doping distance and doping *** study provides insights into the influence of heteroatom doping on the chemical environment of reaction active centers,and provides the theoretical guidance for controlling the doping distance of heteroatoms to achieve optimal catalytic activity and selectivity.

关键词： distance effect microenvironment heteroatom doping FeN_(4) Sabatier-like relationship structure-activity relationship

Coherent beam combining of two all‑PM thulium‑doped fiber chirped pulse amplifiers

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Frontiers of Optoelectronics 2024年第2期17卷 33-42页

作者： Bo Ren Hongxiang Chang Can Li Tao wang Kaikai Jin Jiayi Zhang Kun guo Rongtao su Jinyong Leng Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China Hunan Provincial Key Laboratory of High Energy Laser Technology National University of Defense TechnologyChangsha 410073China

In this paper,we report a coherent beam combining(CBC)system that involves two thulium-doped all-polarization maintaining(PM)fiber chirped pulse *** phase-locking the two channels via a fiber stretcher by using the stochastic parallel gradient descent(SPGD)algorithm,a maximum average power of 265 W is obtained,with a CBC efficiency of 81%and a residual phase error of λ/*** de-chirping by a pair of diffraction gratings,the duration of the combined laser pulse is compressed to 690 *** into account the compression efficiency of 90%and the main peak energy proportion of 91%,the corresponding peak power is calculated to be 4 *** laser noise characteristics before and after CBC are examined,and the results indicate that the CBC would degrade the low frequency relative intensity noise(RIN),of which the integration is 1.74%in[100 Hz,2 MHz]at the maximum combined output *** addition,the effects of the nonlinear spectrum broadening during chirped pulse amplification on the CBC efficiency are also investigated,showing that a higher extent of pulse stretching is effective in alleviating the spectrum broadening and realizing a higher output power with decent combining efficiency.

关键词： Coherent beam combining Thulium-doped fiber laser High-average power Chirped pulse amplifier

Risk Stratification and Prognosis of Pulmonary Arterial Hypertension Associated with Congenital Heart Disease

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Congenital Heart Disease 2024年第3期19卷 325-339页

作者： Wenjie Dong Zhibin Hong Aqian wang Kaiyu Jiang Hai Zhu Fu zhang Zhaoxia guo Hongling su Yunshan Cao Department of Cardiology The First People’s Hospital of TianshuiTianshui741000China Department of Cardiology Pulmonary Vascular Disease CenterGansu Provincial HospitalLanzhou730000China Heart Lung and Vessels CenterSichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengdu610072China

Background:Current guidelines for managing pulmonary arterial hypertension(PAH)recommend a risk strati-fication ***,the applicability and accuracy of these strategies for PAH associated with congenital heart disease(PAH-CHD)require further *** study aims to validate the reliability and predictive accuracy of a simplified stratification strategy for PAH-CHD patients over a three-year ***,new prognostic variables are identified and novel risk stratification methods are developed for assessing and managing PAH-CHD ***:This retrospective study included 126 PAH-CHD *** and biochemical variables across risk groups were assessed using Kruskal-Wallis and Fisher’s exact ***-dent risk factors were identified using ordered logistic regression,while Kaplan-Meier and Cox proportional hazards regression analyses evaluated their impact on all-cause mortality.A new stratification model for the PAH-CHD population was constructed based on these ***:Significant survival differences across stratified risk groups were observed(p<0.001),validating the effectiveness of the simplified risk stratification method in PAH-CHD *** activity was a strong independent predictor of adverse outcomes of PAH-CHD patients(Hazard ratio 0.95,p<0.001,C-index 0.70).A model combining N-terminal pro-brain natriuretic peptide,prothrombin activity,albumin,and right atrial area achieved an area under the curve of 0.89 and a C-index of ***:The simplified risk stratification method is applicable to PAH-CHD *** activity is a strong independent predictor of adverse outcomes.A comprehensive risk stratification approach,incorporating both established and novel biomarkers,enhances accessibility and offers predictive efficacy during follow-up for PAH-CHD patients,comparable to established models.

关键词： Pulmonary hypertension pulmonary arterial hypertension congenital heart disease risk stratification

High-Quality van der Waals Epitaxial CsPbBr3 Film Grown on Monolayer Graphene Covered TiO2 for High-Performance Solar Cells

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Energy & Environmental Materials 2024年第4期7卷 239-246页

作者： Zhaorui Wen Chao Liang Shengwen Li Gang wang Bingchen He Hao Gu Junpeng Xie Hui Pan Zhenhuang su Xingyu Gao guo Hong Shi Chen Institute of Applied Physics and Materials Engineering University of Macau MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter State Key Laboratory for Mechanical Behavior of Materials School of Physics Xi'an Jiaotong University Shanghai Institute of Applied Physics Chinese Academy of Sciences Department of Materials Science and Engineering & Center of super-Diamond and Advanced Films City University of Hong Kong

Two-dimensional materials have been widely used to tune the growth and energy-level alignment of ***,their incomplete passivation and chaotic usage amounts are not conducive to the preparation of highquality perovskite ***,we succeeded in obtaining higher-quality CsPbBr3films by introducing large-area monolayer graphene as a stable physical overlay on top of TiO2substrates.

关键词： all-inorganic perovskite solar cells buried interface modification monolayer graphene van der Waals epitaxial growth

Molecule configurations modulate packing array and charge transfer in cocrystal engineering

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Science China Chemistry 2024年第2期67卷 512-516页

作者： Shenglong An Mengyuan Qiao Xin Jin Xuanying Chen Jianhua su Lifang guo Zhiyun Zhang Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CentreFrontiers Science Center for Materiobiology and Dynamic ChemistryEast China University of Science&TechnologyShanghai200237China

Organic cocrystal as an emerging assembly strategy has received increasing attention in constructing multiple functional materials,through continually screening suitable constituent monomers or changing their stoichiometry ***,the role of molecule configuration in the cocrystal field is rarely explored despite the fascinating potential in regulating the packing *** this study,the N,N′-diphenyl-5,10-dihydrophenazine derivatives(DPPs) with the flexible scaffold and different methyl substitutions are selected as the donors bearing various molecular *** a simple collaborative way,a series of cocrystals based on DPPs and OFN(octafluoronaphthalene) are fabricated,exhibiting two self-adaptive molecular stacking arrays.X-ray crystallographic analysis and theoretical calculation unveil their different π···π interactions and charge transfer characters,leading to the significant emission redshift up to 125 nm compared with individual *** a result,controllable molecule stacking structure,tunable emission,and charge transfer properties can be *** study provides a new perspective to reveal the structure-property relationships at the molecular level by controlling the molecule configuration in cocrystal engineering,contributing to the development of cocrystal theoretical physics and organic functional materials.

关键词： cocrystals molecular configuration self-adaptive packing mode charge transfer

Occurrence of viable but non-culturable(VBNC)pathogenic bacteria in tap water of public places

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Frontiers of Environmental Science & Engineering 2024年第3期18卷 115-129页

作者： Lizheng guo Xinyan Xiao Kassim Chabi Yiting Zhang Jingjing Li su Yao Xin Yu China National Research Institute of Food and Fermentation Industries Co. Ltd.China Center of Industrial Culture CollectionBeijing 100015China Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China College of Environment&Ecology Xiamen UniversityXiamen 361102China

Viable but non-culturable(VBNC)bacteria have been detected in source water and effluent of drinking water treatment processes,leading to significant underestimation of viable cell *** information exists on VBNC bacteria in tap water,particularly in public *** address this gap,a comprehensive nine-month study was conducted in a major city in south-eastern China,using culture-based and quantitative PCR with propidium monoazide(PMA)dye ***-five samples were collected from five representative public places(railway station,campus,hospital,shopping mall,and institution).The findings revealed that culturable bacteria represented only 0–17.51%of the viable 16S rRNA genes,suggesting that the majority of viable bacteria existed in an uncultured or VBNC ***,opportunistic pathogens such as Escherichia coli,Enterococcus faecalis,Pseudomonas aeruginosa,Salmonella sp.,and Shigella *** primarily detected as VBNC cells,with concentrations ranging from 1.03×10^(0)to 3.01×10^(3),1.20×10^(0)to 1.42×10^(2),1.32×10^(0)to 8.82×10^(0),1.00×10^(0)to 6.71×10^(1),and 2.07×10^(0)to 1.93×10^(2)cell equivalent/100 mL,*** *** was observed in tap water after prolonged stagnation,indicating potential risks associated with bacterial *** and temporal factors accounted for 17.1%and 26.0%,respectively,of the variation in tap water community structure during the sampling period,as revealed by 16S rRNA amplicon *** study provides quantitative insights into the occurrence of VBNC bacteria in tap water and highlights the need for more sensitive monitoring methods and microbial control techniques to enhance tap water safety in public locations.

关键词： VBNC Pathogenic bacteria PMA treatment Public tap water Community structure

The behaviors of gas-liquid two-phase flow under gas kick during horizontal drilling with oil-based muds

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Petroleum 2024年第1期10卷 49-67页

作者： Yu su Huiyun Ma Jianhua guo Xinyu Shen Zhaoliang Yang Jie Wu Engineering Technology Research Institute PetroChina Southwest Oil&Gas Field CompanyChengdu610017PR China

Natural gas is easily soluble in oil-based muds(OBM),leading to complex flow behavior in wellbores,especially in horizontal *** this study,a new transient flow model considering wellbore-formation coupling and gas solubility on flow behavior is developed to simulate gas kicks during horizontal drilling with ***,the effect of gas solubility on parameters such as bottom-hole pressure(BHP),gas void fraction and mixture velocity in the flow behavior is ***,several critical factors affecting flow behavior are investigated and compared to gas kicks in water-based muds(WBM)where the effect of solubility is *** results show that the invading gas exists as dissolved gas in the OBM and as free gas in the *** the gas escapes from the OBM,the pit gain is zero and there is barely any change in the BHP,annulus return flow rate and mixture velocity,which means that detecting gas kicks through these warning signs can be challenging until they get very close to the surface and develop ***,in WBM drilling,these parameters change quickly with the increasing gas kick ***,for both cases,the longer the horizontal length and the greater reservoir permeability,the greater the decrease in BHP,and the shorter the time for gas to migrate from the bottom-hole to the wellhead.A larger flow rate contributes to a greater initial BHP and a lesser BHP *** research is of value in characterizing gas kick behavior and identifying novel ways for early gas kick detection during horizontal drilling with OBM.

关键词： Flow behavior Gas solubility Gas kick Horizontal drilling Oil-based muds Water-based muds

Solid superacid catalysts promote high-performance carbon dots with narrow-band fluorescence emission for luminescence solar concentrators

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Chinese Chemical Letters 2024年第8期35卷 437-442页

作者： Rui Cheng Xin Huang Tingting Zhang Jiazhuang guo Jian Yu su Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials Nanjing 210009China

Facile and efficient method for constructing carbon dots(CDs)with narrow full width at half maximum(FWHM)is a major challenge in the field,and researches on regulating the FWHM of CDs are also rare and *** this work,we delved into the synthesis of CDs with narrow fluorescence emission FWHM(NFEF-CDs)in the m-phenylenediamine(m-PD)/ethanol system,utilizing solid superacid resin as cata-lyst with solvothermal *** resulting NFEF-CDs exhibit a photoluminescent(PL)emission peak at 521 nm with a narrow FWHM of 41 nm,an absolute PL quantum yield(QY)of 80%,and display excitation-independent PL *** comprehensive characterization,we identified the protonation of edge amino on NFEF-CDs as the key factor in achieving the narrow ***,we validated the broad applicability of solid superacid resins as catalysts for synthesizing CDs with narrow FWHM in the m-PD/ethanol ***,we utilized a self-leveling method to prepare NFEF-CDs film on the surface of poly(methyl methacrylate)(PMMA)substrate and investigated the solid-state fluorescence properties of NFEF-CDs as well as their performance as luminescence solar concentrator(LSC)for photovoltaic *** results revealed that the as-prepared LSC exhibit an internal quantum efficiency(η_(int))of 42.39%and an optical efficiency(η_(opt))of 0.68%.These findings demonstrate the promising prospects of NFEF-CDs in the field of LSCs and provide a theoretical basis for their application in photovoltaic conversion.

关键词： Carbon dots Narrow full width at half maximum Solid-state fluorescence Luminescence solar concentrators Photovoltaic conversion

Paeoniflorin alleviates depression by inhibiting the activation of NLRP3 inflammasome via promoting mitochondrial autophagy

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Chinese Journal of Natural Medicines 2024年第6期22卷 515-529页

作者： su Lili guo Pengli guo Xiangjuan HE Zhongmei ZHAO Yan ZONG Ying LI Jianming CHEN Weijia DU Rui College of Chinese Medicinal Materials Jilin Agricultural UniversityChangchun 130118China Jilin Provincial Engineering Research Center for Efficient Breeding and Product Development of Sika Deer Changchun 130118China Key Laboratory of Animal Production and Product Quality and Security Ministry of EducationMinistry of National EducationChangchun 130118China

Depression ranks among the most common neuropsychiatric disorders *** studies examining the roles of inflammation and mitochondrial autophagy in the antidepressant efficacy of paeoniflorin(PF)are *** study aimed to elucidate PF’s antidepressant mechanism by promoting autophagy and inhibiting NLRP3 inflammasome activation using chronic unpredictable mild stimulation(CUMS)-induced C57BL/6 mouse models in vivo and corticosterone(CORT)-induced HT22 cell models in *** demonstrated that PF enhanced the viability of HT22 cells following CORT exposure,restored mitochondrial membrane poten-tial(MMP),reduced reactive oxygen species accumulation,increased LC3 fluorescence intensity,and suppressed inflammatory cy-tokine secretion and inflammation ***,PF ameliorated depressive behaviors induced by CUMS and improved damage in hippocampal *** also reduced the expression of NLRP3,ASC,Caspase-1,IL-1β,and the assembly of the NLRP3 ***,PF upregulated the expression of autophagy-related proteins in the hippocampus,facilitating the clearance of damaged mitochondria and enhancing *** role of autophagy in PF’s antidepressant effects was further confirmed through the use of the autophagy inhibitor 3-methyladenine(3-MA),which reduced the efficacy of *** conclusion,PF effectively improved depressive behaviors in CUMS-induced mice and reduced NLRP3-mediated inflammation both in vivo and in vitro,likely via the in-duction of autophagy.

关键词： Paeoniflorin Depression Autophagy NLRP3 inflammasome