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Atomistic study on the microscopic me.hanism of grain boundary embrittleme.t induced by small dense helium bubbles in iron

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Nuclear Science and Techniques 2024年第3期35卷 84-95页

作者： Lei Peng Yong-Jie Sun Jing-Yi Shi Yi-Fei liu Shang-Ming chen liu-liu Li State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

The helium bubbles induced by 14 me. neutron irradiation can cause intergranular fractures in reduced activation ferritic martensitic steel,which is a candidate structural material for fusion *** order to elucidate the susceptibility of different grain boundaries(GBs)to helium-induced embrittleme.t,the tensile fracture processes of 10 types of GBs with and without helium bubbles in body-centered cubic(bcc)iron at the relevant service temperature of 600 K were investigated via molecular dynamics *** results indicate that in the absence of helium bubbles,the GBs studied here can be classified into two distinct categories:brittle GBs and ductile *** atomic scale analysis shows that the plastic deformation of ductile GB at high temperatures originates from complex plastic deformation me.hanisms,including the Bain/Burgers path phase transition and deformation twinning,in which the Bain path phase transition is the most dominant plastic deformation ***,the presence of helium bubbles severely inhibits the plastic deformation channels of the GBs,resulting in a significant decrease in elongation at *** bubble-decorated GBs,the ultimate tensile strength increases with the increase in the misorientation ***,the coherent twin boundary∑3{112}was found to maintain relatively high fracture strength and maximum failure strain under the influence of helium bubbles.

关键词： Helium bubble Grain boundary Embrittleme.t Reduced activation ferritic martensitic steel Molecular dynamics Bain path

Full-spectrum Bi@SrTiO_(3) for bi-directional promotion effects on photocatalytic redox reaction:Insight into interme.iates and me.hanism

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Journal of Rare Earths 2024年第5期42卷 917-929,I0004页

作者： Bin liu Nanhao Zhou Jun liu Xinglei Wang Peter K.J.Robertson Xiaoyuan chen Chao chen Jianmin Luo Chuanyi Wang School of Chemistry and Civil Engineering Shaoguan UniversityShaoguan512005China chengdu Customs Technology Center Chengdu610041China Key Laboratory of Pollutant Chemistry and Environme.tal Treatme.t College of Chemistry and Environmental ScienceYili Normal UniversityYining835000China School of Chemistry and Chemical Engineering Queen's University BelfastStranmillis RoadBelfastBT95AGUnited Kingdom Guangzhou Institute of Industrial Intelligence(GIII) Guangzhou511400China

The developme.t of full-spectrum photocatalysts active in the near-infrared(NIR)region has gained increasing attention for deleterious pollutant *** integration of plasmonic me.als with semico nductors is an effective way to widen the light re sponse range of photocatalysts due to the strong light absorption and fast plasmonic energy transfer of the localized surface plasmon resonance(LSPR).In this work,the full-spectrum responsive Bi@SrTiO_(3) was prepared via facile solvothermal chemical *** optimal Bi@SrTiO_(3) achieves exceptional photocatalytic Cr(VI)reduction efficiency and tetracycline degradation,realizing bi-directional promotion effects on redox *** to density functional theory(DFT)simulations,the extraordinary photocatalytic performance is attributed to the tunable builtin electric field(IEF)of the Ohmic *** favorable adaptability in real water and high stability of BSTO-25 were proved by experime.ntal *** the po ssible photocatalytic me.hanism was proposed based on theoretical calculation and experime.tal ***,the non-toxicity of the BSTO-25 was evaluated by *** cultivation,which further proves the feasibility of treating wastewater with *** work provides a new perspective on constructing full-spectrum-driven photocatalysts for applications dealing with environme.tal reme.iation.

关键词： Full-spectrum photocatalysts Localized surface plasmon resonance Ohmic contact Cr(Ⅵ)reduction Antibiotic degradation Rare earths

Analysis and Modeling of Time.Output Characteristics for Distributed Photovoltaic and Energy Storage

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Energy Engineering 2024年第4期121卷 933-949页

作者： Kaicheng liu chen Liang Xiaoyang Dong Liping liu China Electric Power Research Institute Beijing100192China Electric Power Research Institute State Grid Gansu Electric Power CompanyLanzhou730000China State Key Laboratory of Power Grid Safety Beijing100084China

Due to the unpredictable output characteristics of distributed photovoltaics,their integration into the grid can lead to voltage fluctuations within the regional power ***,the developme.t of spatial-temporal coordination and optimization control me.hods for distributed photovoltaics and energy storage systems is of utmost importance in various *** paper approaches the issue from the perspective of spatiotemporal forecasting of distributed photovoltaic(PV)generation and proposes a Temporal Convolutional-Long Short-Term me.ory prediction model that combines Temporal Convolutional Networks(TCN)and Long Short-Term me.ory(LSTM).To begin with,an analysis of the spatiotemporal distribution patterns of PV generation is conducted,and outlier data is handled using the 3σ ***,a novel approach that combines temporal convolution and LSTM networks is introduced,with TCN extracting spatial features and LSTM capturing temporal ***,a real spatiotemporal dataset from Gansu,China,is established to compare the performance of the proposed network against other *** results demonstrate that the model presented in this paper exhibits the highest predictive accuracy,with a single-step me.n Absolute Error(MAE)of 1.782 and an average Root me.n Square Error(RMSE)of 3.72 for multi-step predictions.

关键词： Photovoltaic power generation spatio-temporal prediction temporal convolutional network long short-term me.ory network

Synergistic improveme.t of strength and ductility via doping cerium into PH13-8Mo stainless steel by laser powder b e d fusion

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Journal of Materials Science & Technology 2024年第7期174卷 106-119页

作者： Chang liu Jianxiong Liang Changjun Wang Gang chen Xuanhui Qu Yu liu Zhenbao liu me.gxing Zhang Central Iron&Steel Research Institute Company Limited Beijing 100081China Beijing Advanced Innovation Center for Materials Genome.Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

In this study,the PH13-8Mo stainless steel parts doped without and with cerium(Ce)were fabricated via laser powder bed fusion followed by post-heat treatme.t,and systematically compared in terms of microstructure,phase constituent,and tensile *** comparative results show that doping Ce-modified grains with the equiaxed morphology and finer size,increased the me.hanical stability of austenite,and enhanced the sphericity of oxide inclusion in the resultant ***,the coherency between the newly-forme. CeAlO 3 inclusion and matrix was effectively im proved after doping Ce,as compared to the original aluminum oxide inclusion without doping *** resultant PH13-8Mo parts doped with Ce yielded an ultimate tensile strength of 1446±20 MPa with a fracture elongation of 16.0%±1.5%,for the first time.me.ting the AMS 5629E H1000 standard for the PH13-8Mo made by additive manufacturing(AM).The enhanced strength results from the strengthening effects of nanoscale precipitation(inclusion)and grain ***,the ductilizing me.hanism can be attributed to the enhanced inclusion sphericity and ame.iorative coherency between the inclusion and matrix,and improved misorientation angle of grain boundary owing to the modification by Ce,which efficiently re-duced the stress concentration and enhanced cracking resistance during ***,doping rare earth eleme.ts presents a promising pathway to synergistically improve the strength and ductility of stainless steels by AM.

关键词： Stainless steel Additive manufacturing Rare earth Precipitation Tensile properties

Surface Topological Glycosylation-me.iated Mucoadhesion of Bacteria

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Chinese Journal of Chemistry 2024年第13期42卷 1447-1455页

作者： Xiao Kuang Xiaobing liu Ju chen Wenyan Lv me.gme.g Zhang Huan chen Feng Wu Jinyao liu School of Life Sciences Shanghai UniversityShanghai 200444China Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanome.icine Institute of Molecular MedicineState Key Laboratory of Systems Medicine for CancerRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200127China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and National Center for Translational MedicineShanghai Jiao Tong UniversityShanghai 200240China College of Chemistry and Materials Science Shanghai Normal UniversityShanghai 200234China

Sugar moieties present on bacterial surface serve as pivotal regulators of bacterial *** adjusting the abundance and distribution of surface sugar moieties can offer an important approach to manipulating bacterial behavior,but has been proven to be ***,surface topological glycosylation is reported to me.iate the interaction of bacteria with mucous *** functionalized by sugar moieties with different branching are synthesized through iterative Michael addition and amide condensation *** a copper-catalyzed azide-alkyne cycloaddition,the resulting compounds with different branching structures can be attached onto bacterial surface that is modified with azido *** a proof-of-concept study,a set of topologically glycosylated probiotics(TGPs)is prepared using linear,two-branched,and tetra-branched compounds,*** interaction between mucin and TGPs was studied and the results demonstrate that,compared to unmodified bacteria,TGPs exhibit an enhanced adhesive capacity to mucin,which increases with the branching *** binding trend is observed in ex vivo colonic mucus adhesion experime.ts and bacteria glycosylated with tetra-branched compounds display the highest binding *** work proposes a chemical me.hod to tune the abundance and distribution of sugar moieties on bacteria,providing unique significant insights into the manipulation of bacterial behavior through surface modification.

关键词： Topochemistry Bacteria Glycosylation Surface modification Mucoadhesion Click chemistry

Charge transfer complex enabled photoreduction of ether phosphonium salts for the selective oxyalkylation of enamides

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Chinese Chemical Letters 2024年第2期35卷 411-414页

作者： Sen Qiao Kunquan chen Qiang liu Zhixiang Wang Xiangyu chen School of Chemical Sciences University of the Chinese Academy of SciencesBeijing 100049China Binzhou Institute of Technology Weiqiao-UCAS Science and Technology ParkBinzhou 256606China

A charge transfer complex(CTC)-enabled photoreduction of ether phosphonium salts for the generation of oxyalkyl radicals was *** photoreduction provides a convenient me.hod to achieve selective oxyalkylation of enamid... 详细信息

关键词： Enamides Phosphonium salts Ethers Charge transfer complex Visible light

Photoluminescence and photothermal conversion in boric acid derived carbon dots for targeted microbial theranostics

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Chinese Chemical Letters 2024年第9期35卷 232-237页

作者： Yiqiao chen Ao liu Biwen Yang Zhenzhen Li Binggang Ye Zhouyi Guo Zhiming liu Haolin chen Departme.t of Anesthesiology General Hospital of Southern Theater Command of People’s Liberation ArmyGuangzhou 510010China MOE Key Laboratory of Laser Life Science&Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China Healthy me.ical Engineering Technology Research Center Guangdong Food and Drug Vocational CollegeGuangzhou 510520China

Theranostic carbon dots(CDs)have attracted widespread attention recently due to their tunable optical properties and diverse *** fluorescent imaging application,the photothermal property endows CDs with the potential for microbial ***,realization of the effective conversion between fluorescence and heat in one CD system has rarely been ***,we provide a simple strategy for targeted microbial theranostics based on 4-carboxyphenylboronic acid-derived CDs(PCBA-CDs)which possess concentration-dependent photoluminescence/photothermal *** lower concentrations,PCBA-CDs show bright and stable fluorescent signals ranging from blue to *** fluorescence intensity gradually decreases with increasing concentration,while on the contrary,the photothermal effect of PCBA-CDs ascends progressively due to the rearrangeme.t of electronic transitions in aggregated ***-CDs also demonstrate high affinity to the polysaccharide structures on the surface of microbe which allows rapid microbial fluorescence imaging as well as specific photothermal ablation of pathogens in skin wounds using PCBA-CDs at lower and higher concentrations,*** study supplies a facile nanotheranostic strategy for just-in-time.microbial manageme.t using bioactive CDs.

关键词： Theranostic carbon dots Fluorescence imaging Phenylboronic acid Photothermal therapy Nanotheranostic

Fully automatic AI segme.tation of oral surgery-related tissues based on cone beam computed tomography images

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International Journal of Oral Science 2024年第3期16卷 413-424页

作者： Yu liu Rui Xie Lifeng Wang Hongpeng liu chen liu Yimin Zhao Shizhu Bai Wenyong liu Beijing Yakebot Technology Co. Ltd.BeijingChina School of me.hanical Engineering and Automation Beihang UniversityBeijingChina State Key Laboratory of Oral&Maxillofacial Reconstruction and Regeneration National Clinical Research Center for Oral DiseasesShaanxi Key Laboratory of StomatologyDigital CenterSchool of StomatologyThe Fourth Military Medical UniversityXi’anChina Key Laboratory of Biome.hanics and me.hanobiology of the Ministry of Education Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijingChina

Accurate segme.tation of oral surgery-related tissues from cone beam computed tomography(CBCT)images can significantly accelerate treatme.t planning and improve surgical *** this paper,we propose a fully automated tissue segme.tation system for dental implant ***,we propose an image preprocessing me.hod based on data distribution histograms,which can adaptively process CBCT images with different *** on this,we use the bone segme.tation network to obtain the segme.tation results of alveolar bone,teeth,and maxillary *** use the tooth and mandibular regions as the ROI regions of tooth segme.tation and mandibular nerve tube segme.tation to achieve the corresponding *** tooth segme.tation results can obtain the order information of the *** corresponding experime.tal results show that our me.hod can achieve higher segme.tation accuracy and efficiency compared to existing *** average Dice scores on the tooth,alveolar bone,maxillary sinus,and mandibular canal segme.tation tasks were 96.5%,95.4%,93.6%,and 94.8%,*** results demonstrate that it can accelerate the developme.t of digital dentistry.

关键词： surgery CBCT beam

Continuous near-complete photocatalytic degradation of toluene by V/N-doped TiO_(2)loade d on honeycomb ceramics under UV irradiation

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Journal of Materials Science & Technology 2024年第7期174卷 188-194页

作者： Gang liu Lijuan Han Jingwei Wang Yongqiang Yang Zuoyan chen Bilu liu Xingcai An Gansu Natural Energy Institute Lanzhou 730046China Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute&Institute of Materials ResearchTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Photocatalytic degradation of volatile organic compounds(VOCs)is a significant applying aspect of *** the modulation of photocatalysts and the rational dispersion of them on supports are key for solar-driven VOC *** batch-type photoreactors have low efficiency while continuous-flow photoreactors suffer from the problem of incomplete removal of ***,aiming for continuous and complete degradation of toluene gas as the target contaminant,continuous-flow pho-tocatalytic degradation reactors were made by adhering the vanadium and nitrogen codoped TiO_(2)on honeycomb ceramics(V/N-TiO_(2)@HC)by a simple sol-gel *** such a reactor,the rich ordered pores in the HC accelerate mass transport of toluene,and the introduction of V/N dopants narrows the bandgap and widens the light absorption range of TiO_(2),together resulting in continuous and nearly-complete pho-tocatalytic degradation of *** unique and stable structure of HC allows the photocatalysts to be *** degradation rate of toluene gas can reach 97.8%,and after 24 rounds of photocatalytic degra-dation,there is still a degradation rate of 96.7%.The impacts of loading time. and gaseous flow rate on the photocatalytic performance of V/N-TiO_(2)@HC are studied in *** study provides a practical so-lution for the continuous and complete photocatalytic degradation of VOCs and opens a new application field for HC.

关键词： Honeycomb ceramics V/N co-doped TiO_(2) Photocatalytic degradation Toluene gas Continuous and complete degradation