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Solar-assisted photocatalytic water splitting using defective UiO-66 solids from modulated synthesis

nano Research 2024年第5期17卷 4134-4150页

作者： Celia m.Rueda-navarro maría Cabrero-Antonino Paula Escamilla Valentín Díez-Cabanes Dong fan Pedro Atienzar Belén Ferrer Ignacio Vayá Guillaume maurin Herme G.Baldoví Sergio navalón Departam.nto de Química Universitat Politècnica de ValènciaCamino de Vera s/nValencia 46022Spain Instituto de Ciencia molecular(ICmOL) Universitat de ValènciaPaterna 46980Spain ICGm Univ.MontpellierCNRSENSCMMontpellier34095France Instituto de Tecnología Química(UPV-CSIC) Universitat Politècnica de ValènciaAvenida de los Naranjos s/nValencia 46022Spain

metal-organic frameworks(mOFs)are attracting increasing interests as photocatalysts for solar-driven hydrogen production from *** paper reports on a comparative study of using either acetic acid(AA)or trifluoroacetic acid(TFA)as the representative UiO-66 organic modulators for synthesizing visible light responsive UiO-66(Zr)-X(X:nH_(2) or nO_(2))photocatalysts for water *** results show that photocatalytic hydrogen generation from a water/methanol mixture can be improved by varying the nature and amount of the modulator employed to prepare the different UiO-66(Zr)-X(X:nH_(2) or nO_(2))solid ***-66(Zr)-nH_(2) was the most active photocatalyst,followed by UiO-66(Zr)-nO_(2),both prepared with 12 equivalents of AA with respect to the organic *** UiO-66(Zr)-nH_(2) solid was more active than the parent mOF in photocatalytic overall water splitting(OWS)(H_(2) and O_(2) production of 450 and 160μmol·g^(-1),respectively,in 5 h;apparent quantum yield(AQY)at 400 nm of 0.06%)in the absence of methanol and compares favourably with analogous *** on the photocatalytic activity of the most active solids of both series was obtained by means of a series of techniques,including ultraviolet-visible(UV-vis)diffuse reflectance,X-ray photoelectron spectroscopy(XPS),laser flash photolysis(LFP),electron spin resonance(ESR),photolum.nescence and photoelectrochemical measurem.nts together with density functional theory(DFT)*** results showed that organic acid modulators can be used to enhance the photocatalytic activity of missing linker UiO-66 defective materials in solar-powered water splitting.

关键词： heterogeneous photocatalysis metal-organic frameworks(mOFs) UiO-66 materials carboxylic acid modulators water splitting solar light

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Grain refinem.nt of mg-Ca alloys by native mgO particles

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Journal of magnesium and Alloys 2024年第3期12卷 980-996页

作者： Shihao Wang Yun Wang Quentin m.Ramasse Zhongyun fan Super STEm Laboratory SciTech Daresbury CampusDaresbury WA44ADUK School of Chemical and Process Engineering University of LeedsLeeds LS29JTUK BCAST Brunel University LondonUxbridgeMiddlesex UB83PHUK

In mg-Ca alloys the grain refining mechanism,in particular regarding the role of nucleant substrates,remains the object of *** native mgO is being recognised as a nucleating substrate accounting for grain refinem.nt of mg alloys,the possible interactions of mgO with alloying elem.nts that may alter the nucleation potency have not been elucidated ***,we design casting experim.nts of mg-xCa alloys varied qualitatively in number density of native mgO,which are then comprehensively studied by advanced electron *** results show that grain refinem.nt is enhanced as the particle number density of mgO *** native mgO particles are modified by interfacial layers due to the co-segregation of Ca and n solute atoms at the mgO/mg *** aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy,we reveal the nature of these Ca/n interfacial layers at the atomic *** of the crystallographic term.nation of mgO,Ca and n co-segregate at the mgO/mg interface and occupy mg and O sites,respectively,form.ng an interfacial structure of a few atomic *** interfacial structure is slightly expanded,less ordered and defective compared to the mgO matrix due to compositional deviations,whereby the mgO substrate is altered as a poorer template to nucleate mg *** solidification in a TP-1 mould,the impotent mgO particles account for the grain refining mechanism,where they are suggested to participate into nucleation and grain initiation processes in an explosive *** work not only reveals the atomic engineering of a substrate through interfacial segregation but also dem.nstrates the effectiveness of a strategy whereby native mgO particles can be harnessed for grain refinem.nt in mg-Ca alloys.

关键词： mg-Ca alloy Grain refinem.nt mgO Interfacial segregation STEm/EELS Solidification.

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Processing,microstructure,and properties of porous ceramic composites with directional channels

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Journal of materials Science & Technology 2024年第1期168卷 1-15页

作者： Bo Zhang Yang Yang Xueling fan Key Laboratory of Service Perform.nce and Protection Technology in Extreme Environm.nts Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Strength and Vibration of mechanical Structures School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China

Porous ceramic composites with directional microchannels from micrometer to dozens of micrometer levels have attracted more and more attention in various fields including aerospace,biomedicines,and thermal insulation due to their excellent fluid permeability,mechanical properties,*** this article,we summarize the recent directional porous ceramics developm.nts including their main processing routes and respective ***,the properties get from different processing routes have been com-pared and analyzed in terms of microstructures,mechanical properties,and *** has been given to the deeper understanding which can allow one to control the microstructural features of these porous ceramic composites to obtain the desired *** work can provide a useful reference for the developm.nt and application of porous ceramic composites with directional microchan-nels.

关键词： Porous ceramic composites Directional microchannels Processing routes Permeability

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Observation of an upward lightning flash with 21 upward positive leaders initiated from different wind turbines in wind farm

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High Voltage 2024年第1期9卷 163-171页

作者： Li Cai Yifeng Ke Wenchao fan Ruisheng Yan mi Zhou Jianguo Wang Yadong fan Engineering Research Center of m.nistry of Education for Lightning Protection and Grounding Technology School of Electrical Engineering and AutomationWuhan UniversityWuhanChina

As the wind turbine height increases,the probability of multiple upward leaders flashes within the wind farm *** this study,an upward lightning flash containing 21 upward positive leaders(UPLs)initiated from different wind turbines in Zhangbei Wind Farm was *** average speed of the UPLs was 1.2×10^(5) m/s,which mostly decreased to zero before reaching the cloud *** four UPLs developed to cloud height,with prolonged periods of bright light on three of them and with a m.nimum duration of 126 ms.A total of nine return strokes occurred on the other two dissipated leader channels,and the numbers of strokes on the two channels was six and three,*** average interstroke interval for the return strokes was 10.5 *** of these nine return strokes had peak currents smaller than 10 *** high-speed video frames confirmed that competition does exist between the UPLs,and the range of shielding effects increases as the height of the ULs *** effect of fan rotation on the initiation of upward leaders and the shielding effect between the wind turbines and upward leaders are discussed.

关键词： flash return initiated

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OnFractional(g,f,n′,m)-Critical Covered Graphs

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Journal of the Operations Research Society of China 2024年第2期12卷 446-460页

作者： Wei Gao Wei-fan Wang School of Information Science and Technology Yunnan Normal UniversityKunming 650500YunnanChina Departm.nt of mathematics Zhejiang Normal UniversityJinhua 321004ZhejiangChina

The main contribution in this article is threefold:(1)we show the necessary and sufficient condition for graphs to be fractional(g,f)-covered which can be expressed in different forms,and extended to fractional(g,f,m)-covered graphs;(2)the concept of fractional-critical covered graph is put forward and its necessary and sufficient condition is given;(3)we present the degree condition for a graph to be fractional(g,f,n′,m)-critical covered,and show that degree bound is sharp when m is ***,the related result in fractional((a,b,n′,m)-critical covered setting is also verified.

关键词： network Fractional factor Data transmission Fractional covered graph Fractional critical covered graph

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CmmCAn:Lightweight Feature Extraction and matching network for Endoscopic Images Based on Adaptive Attention

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Computers, materials & Continua 2024年第8期80卷 2761-2783页

作者： nannan Chong fan Yang School of Electronic and Information Engineering Hebei University of TechnologyTianjin300401China School of Information and Intelligence Engineering Tianjin Renai CollegeTianjin301636China

In m.nimally invasive surgery,endoscopes or laparoscopes equipped with m.niature cameras and tools are used to enter the hum.n body for therapeutic purposes through small incisions or natural ***,in clinical operating environm.nts,endoscopic images often suffer from challenges such as low texture,uneven illum.nation,and non-rigid structures,which affect feature observation and *** can severely impact surgical navigation or clinical diagnosis due to missing feature points in endoscopic images,leading to treatm.nt and postoperative recovery issues for *** address these challenges,this paper introduces,for the first time,a Cross-Channel multi-modal Adaptive Spatial Feature Fusion(ASFF)module based on the lightweight architecture of ***,a novel lightweight feature extraction and matching network based on attention mechanism is *** network dynamically adjusts attention weights for cross-modal information from grayscale images and optical flow images through a dual-branch Siamese *** extracts static and dynamic information features ranging from low-level to high-level,and from local to global,ensuring robust feature extraction across different widths,noise levels,and blur *** and local matching are performed through a multi-level cascaded attention mechanism,with cross-channel attention introduced to simultaneously extract low-level and high-level *** ablation experim.nts and comparative studies are conducted on the HyperKvasir,EAD,m2caiSeg,CVC-ClinicDB,and UCL synthetic *** results dem.nstrate that the proposed network improves upon the baseline EfficientViT-B3 model by 75.4%in accuracy(Acc),while also enhancing runtime perform.nce and storage *** compared with the complex DenseDescriptor feature extraction network,the difference in Acc is less than 7.22%,and IoU calculation results on specific datasets outperform complex dense ***

关键词： Feature extraction and matching lightweighted network medical images endoscopic attention

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Self‑Healing Dynamic Hydrogel microparticles with Structural Color for Wound m.nagem.nt

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nano-micro Letters 2024年第11期16卷 177-190页

作者： Li Wang Xiaoya Ding Lu fan Anne m.Filppula Qinyu Li Hongbo Zhang Yuanjin Zhao Luoran Shang Departm.nt of General Surgery Ruijin HospitalShanghai Jiaotong University School of MedicineShanghai 200025People’s Republic of China Departm.nt of Rheumatology and Imm.nology Nanjing Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096People’s Republic of China Pharmaceutical Sciences Laboratory Åbo Akademi University20520 TurkuFinland Oujiang Laboratory(Zhejiang Lab for Regenerative medicine Vision and Brain Health)Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325001People’s Republic of China Shanghai Xuhui Central Hospital Zhongshan‑Xuhui Hospitaland the Shanghai Key Laboratory of Medical Epigeneticsthe International Co‑laboratory of Medical Epigenetics and Metabolism(Ministry of Science and Technology)Institutes of Biomedical SciencesFudan UniversityShanghai 200032People’s Republic of China

Chronic diabetic wounds confront a significant medical challenge because of increasing prevalence and difficult-healing *** is vital to develop multifunctional hydrogel dressings,with well-designed morphology and structure to enhance flexibility and effectiveness in wound *** achieve these,we propose a self-healing hydrogel dressing based on structural color microspheres for wound *** microsphere comprised a photothermal-responsive inverse opal framework,which was constructed by hyaluronic acid methacryloyl,silk fibroin methacryloyl and black phosphorus quantum dots(BPQDs),and was further re-filled with a dynamic *** dynamic hydrogel filler was formed by Knoevenagel condensation reaction between cyanoacetate and benzaldehyde-functionalized dextran(DEX-CA and DEX-BA).notably,the composite microspheres can be applied arbitrarily,and they can adhere together upon near-infrared irradiation by leveraging the BPQDs-mediated photothermal effect and the thermoreversible stiffness change of dynamic ***,eum.nitin and vascular endothelial growth factor were co-loaded in the microspheres and their release behavior can be regulated by the same ***,effective m.nitoring of the drug release process can be achieved through visual color *** microsphere system has dem.nstrated desired capabilities of controllable drug release and efficient wound *** characteristics suggest broad prospects for the proposed composite microspheres in clinical applications.

关键词： Black phosphorus Structural color Dynamic hydrogel Inverse opal Wound m.nagem.nt

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Ternary layered boride moAlB:A novel thermo-regulation microwave absorbing ceramic material

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Journal of Advanced Ceramics 2024年第5期13卷 699-710页

作者： Zhangjue Wang fan Zhang nannan Wang Wei Li Yongqiang Chen Hailong Wang Rui Zhang Yanqiu Zhu Bingbing fan School of material Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Academy of Sciences Zhengzhou 450046China State Key Laboratory of Featured metal materials and Life Cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Departm.nt of materials and Earth Sciences Technical University of DarmstadtDarmstadt 64287Germany School of material Science and Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China Departm.nt of Engineering Faculty of EnvironmentScience and EconomyUniversity of ExeterExeter EX44QFUK

In the context of the fifth-generation(5G)smart era,the dem.nd for electromagnetic wave(EmW)-absorbing materials has become increasingly prom.nent,so it is necessary to explore promising candidate *** work focuses on the exploration of the material absorbing properties of a moAlB mAB(mAB represents a promising group of alternatives,where m stands for a transition metal,A typically denotes Al,and B is boron)phase ***,the first-principles calculations were performed to reveal the unique crystal and layered structure of the moAlB ceramics and to predict their potential for use as an EmW absorption ***,a series of moAlB ceramics were synthesized at temperatures ranging from 800 to 1300℃,and the influence of temperature on the phase compositions and microstructures of the obtained moAlB ceramics was characterized and ***,the practical EmW absorption perform.nce of the prepared moAlB ceramics was evaluated via a combination of experim.nts and radar cross-sectional *** moAlB sample synthesized at 900℃ exhibits superior EmW absorption perform.nce,achieving an impressive m.nimum reflection loss(RL)of−50.33 *** unique layered structure and good electrical conductivity of the moAlB samples are the main reasons for their enhanced wave absorption perform.nce,which provides interfacial polarization and multiple dielectric loss ***,this study not only contributes to the understanding of the preparation of moAlB materials but also provides potential guidance for their utilization in the realm of electromagnetic wave absorption.

关键词： moAlB electronic band structure electromagnetic wave(EmW)absorption layered ternary boride density of states

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Grain yield and n uptake of maize in response to increased plant density under reduced water and nitrogen supply conditions

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Journal of Integrative Agriculture 2024年第1期23卷 122-140页

作者： Jingui Wei Qiang Chai Wen Yin Hong fan Yao Guo Falong Hu Zhilong fan Qim.ngWang State Key Laboratory of Aridland Crop Science Lanzhou 730070China College of Agronomy Gansu Agricultural UniversityLanzhou 730070China College of Life Sciences Northwest Normal UniversityLanzhou 730070China

The developm.nt of modern agriculture requires the reduction of water and chemical n fertilizer *** the planting density can maintain higher yields,but also consumes more of these restrictive ***,whether an increased maize density can compensate for the negative effects of reduced water and n supply on grain yield and n uptake in the arid irrigated areas remains *** study is part of a long-term positioning trial that started in 2016.A split-split plot field experim.nt of maize was implem.nted in the arid irrigated area of northwestern China in 2020 to *** treatm.nts included two irrigation levels:local conventional irrigation reduced by 20%(W1,3,240 m^(3)ha^(-1))and local conventional irrigation(W2,4,050 m^(3)ha^(-1));two n application rates:local conventional n reduced by 25%(n1,270 kg ha^(-1))and local conventional n(360 kg ha^(-1));and three planting densities:local conventional density(D1,75,000 plants ha^(-1)),density increased by 30%(D2,97,500 plants ha-1),and density increased by 60%(D3,120,000 plants ha^(-1)).Our results showed that the grain yield and aboveground n accumulation of maize were lower under the reduced water and n inputs,but increasing the maize density by 30% can compensate for the reductions of grain yield and aboveground n accumulation caused by the reduced water and n *** water was reduced while the n application rate remained unchanged,increasing the planting density by 30% enhanced grain yield by 13.9% and aboveground n accumulation by 15.3%.Under reduced water and n inputs,increasing the maize density by 30% enhanced n uptake efficiency and n partial factor productivity,and it also compensated for the n harvest index and n metabolic related enzyme *** with W2n2D1,the n uptake efficiency and n partial factor productivity increased by 28.6 and 17.6%under W1n1D2.W1n2D2 had 8.4% higher n uptake efficiency and 13.9% higher n partial factor productivity than W2n2D1.W1n2D2 improv

关键词： water and n reduction plant density maize grain yield n uptake compensation effect

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Kinetically and thermodynamically expediting elem.ntary steps via high-valence Cr-incorporated of nickel selenide for water electrolysis

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nano Research 2024年第3期17卷 1199-1208页

作者： Huafeng fan Dongxu Jiao Jinchang fan Dewen Wang Bilal Zam.n Wei Zhang Lei Zhang Weitao Zheng Xiaoqiang Cui State Key Laboratory of Automotive Simulation and Control School of Materials Science and EngineeringKey Laboratory of Automobile Materials of MOEJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsElectron Microscopy CenterJilin UniversityChangchun 130012China College of Chemistry Jilin UniversityChangchun 130012China

Designing high-perform.nce electrocatalysts toward hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is essential to reduce the activation barrier and optimize free adsorption energy of reactive ***,we report that incorporating high-valence Cr into niSe_(2)(Cr_(x)ni_(1-x)Se_(2))kinetically and thermodynamically expedites elem.ntary steps of both HER and *** as-prepared Cr_(0.05)ni_(0.95)Se_(2) catalyst displays excellent HER and OER activities,with low overpotentials of 89 and 272 mV at the current density of 10 mA·cm^(-2)(j10),respectively,and remains stable during operation for 30 h.A low cell voltage of only 1.59 V is required to drive j10 in alkaline *** situ Ram.n spectroscopy reveals that Cr incorporation facilitates the formation of niOOH active species during the OER ***,theoretical explorations dem.nstrate that high-valence Cr incorporation efficiently accelerates water dissociation kinetics and improves H*adsorption during HER process,lowering the activation barrier of OER and optimizing the adsorption energy of oxygen-based intermediate,thus kinetically and thermodynamically enhancing the intrinsic perform.nce of niSe_(2) for over water *** strategy provides a new horizon to design transition metal based electrocatalysts in the clean energy field.

关键词： nickel selenide electrocatalytic water splitting high-valence Cr density functional theory(DFT)calculation

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