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Multi-stimuli-responsive chromic switching self-assembled with polyoxometalate and copper-viologen frameworks

cMat 2024年第2期1卷 9-19页

作者： Shen-Zhen Chang hong-Xiao Zhong yan-hong chen Yong-Hui Lin Fu-Xiang Wang Ya-Min Fu Qin-He Pan Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education School of Chemistry and Chemical EngineeringHainan UniversityHaikouChina Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province School of Chemistry and Chemical EngineeringHainan Normal UniversityHaikouChina School of Physics and Optoelectronic Engineering Hainan UniversityHaikouChina

Chromic materials with multi-stimuli responses have received tremendous attention from industry and academia for their potential applications in smart windows,data storage,military camouflage,molecular switches,modulators,*** develop multi-stimuli-responsive color-changing materials with high sensi-tivity and high stability,a polyoxometalate-based copper-viologen framework,formulated as Cu_(2)(H_(2)O)_(2)(L)_(2)[PW_(12)O_(40)][OH^(-)]·2H_(2)O(HNU-97,H_(2)L^(2+)=1,10-(1,4-phenylenebis(methylene))bis(4-carboxypyridinium)),was prepared by a mild one-step self-assembly *** analysis shows that HNU-97 presents a supramolecular structure formed by a one-dimensional copper-viologen frame-work and polyoxometalates through rich hydrogen bonds,anion-πinteractions,*** studies show that HNU-97 exhibits reversible and rapid response characteristics to various external stimuli,such as 10 s to UV radiation,5 min to heating,and 5 min to ammonium/amine *** mechanism re-veals that different external excitation sources lead to different preferential transfer directions of electrons,resulting in different discoloration *** construct stimuli-chromic materials with good mechanical properties,we successfully introduced HNU-97 into the poly(vinyl alcohol)(PVA)/glycerol(Gly)hydrogel to obtain a composite HNU-97@PVA/***,HNU-97@PVA/Gly combines the merits of each component and can achieve signifi-cant response discoloration behavior under both UV irradiation and ammonia *** work will provide an idea for the construction of multiple stimuli-responsive materials.

关键词： chromic switching copper-viologen frameworks multiple-stimulus response polyoxometalates

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The Scheme to Determine the Convergence Term of the Galerkin Method for Dynamic Analysis of Sandwich Plates on Nonlinear Foundations

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Acta Mechanica Solida Sinica 2021年第1期34卷 1-11页

作者： hong-yan chen Hu Ding Shao-Hua Li Li-Qun chen Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematicsand MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversitygShanghai 200444China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversitxyShiyiazhuang 050043China

The vibration of a plate resting on elastic foundations under a moving load is of great significance in the design of many engineering fields,such as the vehicle-pavement system and the aircraft-runway *** or runways are always laminated *** Galerkin truncation method is widely used in the research of *** number of truncation terms directly affects the convergence and accuracy of the response ***,the selection of the number of truncation terms has not been clearly stated.A nonlinear viscoelastic foundation model under a moving load is *** on the natural frequency of linear undisturbed derivative systems,the truncation terms are used to determine the convergence of vibration *** criterion for the convergence of the Galerkin truncation term is *** scheme is related to the natural frequency with high efficiency and *** the dynamic response of the sandwich beam under a moving load,the feasibility of the scheme is *** effects of different system parameters on the scheme and the truncation convergence of dynamic response are *** research in this paper can be used as a reference for the study of the vibration of elastic foundation ***,the model established and the truncation analysis method proposed are helpful for studying the vibration of vehicle-pavement system and related systems.

关键词： ndwich plate Galerkin method Convergence Nonlinear foundation

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New Inorganic-organic Hybrid Compound Containing One Dimensional Keggin Polyoxometalate [SiW_(11)O_(39)Co]^(6-) Chains: Preparation, Characterization and Application in Chemically Bulk-modified Electrode

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Chemical Research in Chinese Universities 2008年第2期24卷 129-134页

作者： WANG Xiu-li LIN hong-yan LIUGuo-cheng chen Bao-kuan BI yan-feng Faculty of Chemistry and Chemical Engineering Bohai University Liaoning Key Laboratry of Applied Chemistry Jinzhou 121000 P. R. China

A new inorganic-organic hybrid compound based on polyoxometalate and organic ligand formulated as （H2bpp）3[SiWlIO39Co]-2H20（1）[bpp=l,3-bis（4-pyridyl）propane] was hydrothermally synthesized and structurally characterized by elemental analysis, single-crystal X-ray diffraction, IR, TG, and cyclic voltammetry. Single-crystal X-ray diffraction analysis reveals that compound 1 consists of interesting cobalt-monosubstituted POMs one dimensional chain together with protonated bpp ligands. Additionally, the polyoxoanions combined with the discrete organic substrates by hydrogen bond interactions to afford a supramolecular 3D network structure. The hybrid compound 1 was used as a bulk modifier to fabricate a three-dimensional chemically modified carbon paste electrode（1-CPE） by direct mixing. The electrochemical behavior and electrocatalysis of 1-CPE were studied in detail. The results indicate that 1-CPE has good electrocatalytic activities toward the reduction of nitrite or bromate in 1 mol/L 1-12SO4 aqueous solution. 1-CPE shows remarkable stability that can be ascribed to the insolubility of compound 1 and the supramolecular interactions existed between 1D POM anion chains and organic ligand bpp, which is very important for practical applications in electrode modification.

关键词： Inorganic-organic hybrid Polyoxometalate Electrochemistry Carbon paste electrode Electrocatalysis

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Trajectories of oxygen saturation within 6–72 hours after birth in neonates at moderate altitude:a prospective longitudinal cohort study

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World Journal of Pediatrics 2023年第9期19卷 894-901页

作者： Qu‑Ming Zhao hong‑yan chen Shi‑Xiu Li Wei‑Li yan Xiao‑Jing Hu Guo‑Ying Huang Children’s Hospital of Fudan University National Children’s Medical Center399 Wan Yuan RoadShanghai 201102China Shanghai Key Laboratory of Birth Defects 399 Wan Yuan RoadShanghai 201102China Luchun County People’s Hospital LuchunChina Research Unit of Early Intervention of Genetically Related Childhood Cardiovascular Diseases(2018RU002) Chinese Academy of Medical SciencesShanghaiChina

Trajectories of pulse oxygen saturation(SpO_(2))within the first few days after birth are important to inform the strategy for identifying asymptomatic hypoxemic disease but remain poorly substantiated at higher *** We performed a longitudinal cohort study with consecutive neonates at a local hospital in Luchun County,China,at an altitude of 1650 m between January and July *** repeatedly measured the pre-and post-ductal SpO_(2)values at 6,12,18,24,36,48,and 72 hours after birth for neonates without oxygen *** neonates underwent echocardiography and were followed up to 42 days after *** included neonates without hypoxemic diseases to characterize the trajectories of SpO_(2)over time using a linear mixed *** considered the 2.5th percentile as the reference value to define hypoxemic *** A total of 1061 neonates were ***-five had non-cardiac hypoxemic diseases,with 84%(21/25)presenting with abnormal SpO_(2)within 24 *** had tetralogy of Fallot identified by *** the 1035 asymptomatic neonates,SpO_(2)values declined from 6 hours after birth,reached a nadir at 48 hours,and tended to level off thereafter,with identical patterns for both pre-and post-ductal SpO_(2).The reference percentile was 92%for both pre-and post-ductal SpO_(2)and was time *** A decline within 48 hours features SpO_(2)trajectories within the first 72 hours at moderate *** findings suggest that earlier screening may favorably achieve a benefit–risk balance in identifying asymptomatic hypoxemic diseases in this population.

关键词： Critical congenital heart disease Hypoxemic disease Pulse oximetry screening Pulse oxygen saturation

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Tailoring the texture and mechanical properties of 3%Y_(2)O_(3)p/ZGK200 composites fabricated by unidirectional and cross rolling followed by annealing

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Journal of Magnesium and Alloys 2024年第4期12卷 1479-1495页

作者： Xihai Li hong yan Zhiwei Shan Rongshi chen Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano)and Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China

3%Y_(2)O_(3)p/ZGK200 composites were subjected to unidirectional rolling(UR)and cross rolling(CR)at 400℃and 350℃followed by annealing at 300℃for 1 *** microstructure,texture and mechanical properties of rolled and annealed composites were systematically *** rolled composites exhibited a heterogeneous microstructure,consisting of deformed grains elongated along rolling direction(RD)and Y_(2)O_(3)particles bands distributed along *** annealing,static recrystallization(SRX)occurred and most deformed grains transformed into equiaxed grains.A non-basal texture with two strong T-texture components was obtained after UR while a non-basal elliptical/circle texture with circle multi-peaks was obtained after CR,indicating that rolling path had great influences on texture of the *** annealing process,R-texture component disappeared or weakened,as results,a non-basal texture with double peaks tilting from normal direction(ND)to transverse direction(TD)and a more random non-basal texture with circle multi-peaks were obtained for UR and CR composites,*** yield strength of rolled composites after UR showed obvious anisotropy along RD and TD while a low anisotropic yield strength was obtained after *** Y_(2)O_(3)particles broke during *** fracture of the composites was attributed to the existence of Y_(2)O_(3)clusters and interfacial debonding between particles and matrix during tension,as a result,the ductility was not as superior as matrix alloy.

关键词： Magnesium matrix composites Unidirectional rolling Cross rolling Texture Mechanical properties

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Low-cycle fatigue behavior of solutionized and aged WE43 magnesium alloys at room temperature

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Journal of Magnesium and Alloys 2024年第6期12卷 2284-2297页

作者： Yong Cai Jianxiong Wei hong yan Yipeng chen Rongshi chen School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China

The low-cycle fatigue behavior of solutionized(T4)and aged(T6)WE43 magnesium alloys was studied at room *** total strain amplitudes(△ε_(t)/2)were 0.4%,0.5%,0.6%,0.7%and 1.0%.Detailed microstructure evolution was characterized by scanning electron microscope(SEM),electron backscattered diffraction(EBSD)and transmission electron microscopy(TEM).The results showed that plastic strain amplitude decreased with the increasing cycle number in T4 alloy,which is due to the dense persistent slip bands(PSBs)and dynamic precipitates hinderingdislocation *** contrast,the plastic strain amplitude increases gradually in T6 alloy,which is attributed to the enhanced activation of pyramidal *** low-cycle fatigue life of T6 alloy with larger fatigue ductility coefficient is longer than that of T4 *** Coffin-Manson model can accurately predict the fatigue life of T4 and T6 alloys compared to Jahed-Varvani(JV)energy *** T4 alloy,the fatigue damage mechanism was dominated by basal *** T6 alloy,the enhanced pyramidal slip plays an important role to accommodate plastic deformation.

关键词： Low-cycle fatigue WE43 alloy Cyclic hardening/softening JV model Dislocation

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Controlled synthesis of ultrasmall RuP_(2) particles on N,P-codoped carbon as superior pH-wide electrocatalyst for hydrogen evolution

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Rare Metals 2021年第5期40卷 1040-1047页

作者： Ying-Hua Wang Rui-Qing Li Hai-Bo Li hong-Li Huang Zeng-Jing Guo hong-yan chen Yao Zheng Kong-Gang Qu School of Chemistry and Chemical Engineering Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage and Novel Cell TechnologyLiaocheng UniversityLiaocheng 252059China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia

Electrocatalytic hydrogen evolution reaction(HER)is a highly potential strategy to massively produce green hydrogen ***,the employment of costly Pt-based electrocatalyst in the cathode of electrolyzer greatly hampers the development of hydrogen *** phosphide catalysts have recently drawn wide attention due to the Pt-like activity but relatively lower ***,a facile strategy was proposed for the controlled preparation of the ultrasmall RuP_(2) nanoparticles on N,P-codoped carbon from common precursors of Ru(Ⅱ)complex and phytic *** taking advantage of simple mixing and pyrolysis,the as-synthesized RuP_(2) nanoparticles were uniformly embedded onto the N,P-codoped carbon *** composite catalyst shows better activity than Pt/C for alkaline HER and comparable activity for acidic and neutral *** superior activity can be ascribed to the ultrasmall-size and efficient RuP_(2) together with good mass and charge transfer ability assured by N,P-codoped carbon *** advantages including low-cost and simple synthesis in this work present an encouraging substitute to replace commercial Pt/C for hydrogen-related practical applications.

关键词： RuP_(2) N P-codoped carbon Hydrogen evolution Electrocatalyst

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Microstructure,mechanical properties and fracture behavior of a new WE43 alloy

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Rare Metals 2021年第8期40卷 2197-2205页

作者： Gui-Long Jia Li-Ping Wang Yi-cheng Feng Er-Jun Guo yan-hong chen Chang-Liang Wang School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin150040China

The microstructures,mechanical properties and fracture behaviors of a new WE43 alloy(Mg-4 Y-1.6 Nd-2 Sm-0.5 Zr)were *** microstructure of the as-cast alloy includes a Mg matrix,Mg_(41)Sm_(5),Mg_(41)Nd_(5)and Mg_(24)Y_(5)eutectic phases,as well asβ-*** an optimal solution treatment,the eutectic phases are almost completely dissolved;only a few spots of blocky Mg-Y compounds remain at grain *** an aging treatment,a large amount ofβ’-phases are dispersed and precipitated at the grain interior,which provides good comprehensive mechanical properties of the alloy,particularly in the under-aged *** tensile strength is up to290 MPa,the yield strength reaches 209 MPa,and the elongation is slightly ***,the fracture behaviors of the studied alloy in different states significantly *** addition,a comparison of mechanical properties of the new WE43,traditional WE43 and other modified WE43 alloys is presented.

关键词： Mg-Y-Nd-Sm-Zr Microstructure Mechanical properties Fracture behavior Heat treatment

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Evaluation of the etiology and risk factors for maternal sepsis: A single center study in Guangzhou, China

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World Journal of Clinical Cases 2021年第26期9卷 7704-7716页

作者： Lin Lin Lu-Wen Ren Xue-Yuan Li Wen Sun yan-hong chen Jing-Si chen Dun-Jin chen Department of Obstetrics and Gynecology The Third Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510150Guangdong ProvinceChina Key Laboratories for Major Obstetric Diseases of Guangdong Province Guangzhou 510150Guangdong ProvinceChina Department of Fetal Medicine and Prenatal Diagnosis The Third Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510150Guangdong ProvinceChina

BACKGROUND Maternal sepsis is a major cause of gestational morbidity and neonatal mortality worldwide and particularly in *** To evaluate the etiology of maternal sepsis and further identify its risk *** In this retrospective study,we evaluated 70698 obstetric patients who were admitted to the Third Affiliated Hospital of Guangzhou Medical University between January 1,2009 and June 30,*** were divided into sepsis group and non-sepsis group based on the incidence of *** about medical history(surgical and obstetric history)and demographic information were *** Mann-Whitney U test was used to compare patient age,gestational age and duration of hospitalization between the two *** and multivariate logistic regression models were used to analyze the etiology and the risk factors for maternal *** and adjusted odds ratios(OR)are *** A total of 561 of 70698 obstetric patients were diagnosed with infection;of the infected patients,492 had non-sepsis associated infection(87.7%),while 69 had sepsis(12.3%).The morbidity rate of maternal sepsis was 9.76/10000;the fatality rate in the sepsis group was 11.6%(8/69).Emergency admission(OR=2.183)or transfer(OR=2.870),irregular prenatal care(OR=2.953),labor induction(OR=4.665),cervical cerclage(OR=14.214),first trimester(OR=6.806)and second trimester(OR=2.09)were significant risk factors for maternal *** Mode of admission,poor prenatal care,labor induction,cervical cerclage,first trimester and second trimester pregnancy were risk factors for maternal *** coli was the most common causative organism for maternal sepsis,and the uterus was the most common site of infection.

关键词： Maternal sepsis Sepsis-3 Infection Risk factors

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Prediction of Neural Tube Defect Using Support Vector Machine

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Biomedical and Environmental Sciences 2010年第3期23卷 167-172页

作者： JIN-FENG WANG XIN LIU YI-LAN LIAO hong-yan chen WAN-XIN LI XIAO-YING ZHENG State key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Institute for Sustainable Water Integrated Management & Ecosystem Research (SWIMMER) University of Liverpool Liverpool L69 3GP UK City University of hong Kong Tsinghua Graduate School at Shenzhen 518055 China Institute of Population Science Peking University Beijing 100187 China

Objective To predict neural tube birth defect （NTD） using support vector machine （SVM）. Method The dataset in the pilot area was divided into non overlaid training set and testing set. SVM was trained using the training set and the trained SVM was then used to predict the classification of NTD. Result NTD rate was predicted at village level in the pilot area. The accuracy of the prediction was 71.50% for the training dataset and 68.57% for the test dataset respectively. Conclusion Results from this study have shown that SVM is applicable to the prediction of NTD.

关键词： NTD Prediction Small sample SVM

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