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China Standardization 2024年第5期129卷 22-27页

作者： Cao Xinxin hu yanan 不详 the ASTM International China Office

With a 126-year history,ASTM International still exudes strong vitality *** is one of the most renowned standards organizations in the world,boasting a globally leading standards development system and *** is open,transparent,fair,diverse,inclusive,and consensus-driven,but these are just some of its *** always prioritizes the development of standards and the needs of industries and users.

关键词： services globally ASTM

Continuous high-temperature rapid nanomanufacturing of electrocatalysts

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Nano Research 2025年第1期18卷 225-235页

作者： Xiaoyang Wang Ziyi Luo Baihua Cui Ziqi Fu Yanchang Liu Weidi Liu Jia Ding Jianrong Zeng yanan ChenWenbin hu School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt.LuciaBrisbane 4072Australia Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

Encapsulating metal nanoparticles in carbon shells(Metal@C)to enhance catalytic activity and stability has been certified ***,most existing methods for preparing Metal@C are complex,time-consuming,and lack of *** this study,a novel method that couples the high-temperature shock(HTS)with ultrasonic spray pyrolysis is reported,which can realize facile and scalable production of various Metal@C through the pyrolysis of glucose and metal chloride *** proposed HTS ultrasonic spray pyrolysis offers several advantages,including compact size,short reaction time(~120 ms),and uniform *** the Ni@C-40 nanocomposite as an example,the ultrasmall Ni nanoparticles(~10 nm)with thin carbon protective shells(~2 nm)are uniformly dispersed in the carbon matrix and applied for oxygen evolution reaction(OER)in alkaline *** Ni@C-40 optimized by tuning the thickness of carbon shell exhibits significantly enhanced OER activity with low overpotential of 242 mV at 10 mA·cm^(-2) and stability,which is attributed to the optimized interactions between Ni nanoparticles and carbon *** method also shows promise for continuous pyrolysis synthesis of various extreme materials at ultra-high temperatures using alternative electric heating materials.

关键词： ultrasonic spray pyrolysis high-temperature shock carbon shell oxygen evolution reaction Metal@C nanocomposite

Design of Linear Functional Noncircular Gear with High Contact Ratio Used in Continuously Variable Transmission

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Chinese Journal of Mechanical Engineering 2023年第3期36卷 205-218页

作者： yanan hu Chao Lin Chunjiang He Yongquan Yu Zhiqin Cai State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China College of Mechanical and Electrical Engineering Binzhou UniversityBinzhou 256600China School of Aeronautics and Astronautics Xiamen UniversityXiamen 361005China

Continuously variable transmission(CVT)of noncircular gear has the technical advantages of large bearing capacity and high transmission *** key technology of CVT with noncircular gear has been broken through some countries,and is in the stage of deep application *** the characteristics and design methods of noncircular gear pairs have been continuously studied in China,the noncircular gear CVT is still in the preliminary exploration and research *** linear functional noncircular gear pair,whose transmission ratio is a linear function in the working section,to realize continuously variable transmission was the research object in this *** to the required transmission ratio in the working section,the transmission ratio function in the non-working section was constructed by using a *** then the influence of pitch curve parameters in the working section on which in the non-working section was also analyzed to obtain the pitch curve suitable for transmission of this gear *** addition,for improving the stability and bearing capacity of gear transmission,the noncircular gear pair transmission with high contact ratio was ***,the accurate value of the contact tooth length was calculated based on the gear principle and the characteristics of the involute tooth profile,from this the contact tooth length error was calculated by comparing the accurate value with its actual value obtained by the rolling ***,an indirect method to verify the contact ratio by detecting the contact length error of the tooth profile was proposed.

关键词： Continuously variable transmission Noncircular gear Pitch curve Contact ratio Contact tooth profile

Efficient electrocatalytic conversion of N_(2) to NH_(3) using oxygen-rich vacancy lithium niobate cubes

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Chinese Journal of Chemical Engineering 2023年第10期62卷 132-138页

作者： Shuhui Fan Qi Wang yanan hu Qiang Zhao Jinping Li Guang Liu Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024China

Instead of the energy-intensive Haber-Bosch process,the researchers proposed a way to produce ammonia using water and nitrogen as feedstock,powered by electricity,without polluting the ***,how to design efficient electrocatalyst for electrocatalytic nitrogen reduction reaction(NRR)is still urgent and ***,a strategy is proposed to adjust the morphology and surface electronic structure of electrocatalyst by optimizing material synthesis ***3(lithium niobate,LN)cubes with oxygen-rich vacancy and regular morphology were synthesized by hydrothermal synthesis and followed molten salt calcination process,which were used for electrocatalytic NRR under mild *** with LN nanoparticles synthesized by solid phase reaction,LN cubes exhibit better NRR performance,with the highest ammonia yield rate(13.74μg.h^(-1).mg^(-1))at the best potential of-0.45V(*** hydrogen electrode,RHE)and the best Faradaic efficiency(85.43%)at-0.4 ***,LN cubes electrocatalyst also demonstrates high stability in 7 cycles and 18 h current-time *** investigation of the reaction mechanism confirmed that the structure of oxygen vacancy could adjust the electronic structure of the electrocatalyst,which was conducive to the adsorption and activation of N_(2) molecule and also increased the ECSA of electrocatalyst,thus providing more active sites for the NRR process.

关键词： Nitrogen reduction reaction Ammonia yield rate Oxygen vacancy LiNbO_(3)cubes Electronic structure

Exosomal let-7a-5p derived from human umbilical cord mesenchymal stem cells alleviates coxsackievirus B3-induced cardiomyocyte ferroptosis via the SMAD2/ZFP36 signal axis

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第5期25卷 422-437页

作者： Xin LI yanan hu Yueting WU Zuocheng YANG Yang LIU Hanmin LIU Department of Pediatric Pulmonology and Immunology West China Second University HospitalSichuan UniversityChengdu 610041China Key Laboratory of Birth Defects and Related Diseases of Women and Children(Sichuan University) Ministry of EducationChengdu 610041China NHC Key Laboratory of Chronobiology(Sichuan University) Chengdu 610041China The Joint Laboratory for Lung Development and Related Diseases of West China Second University Hospital Sichuan University and School of Life Sciences of Fudan UniversityWest China Institute of Women and Children's HealthWest China Second University HospitalSichuan UniversityChengdu 610041China Sichuan Birth Defects Clinical Research Center West China Second University HospitalSichuan UniversityChengdu 610041China Department of Pediatrics the Third Xiangya HospitalCentral South UniversityChangsha 410013China

Viral myocarditis(VMC)is one of the most common acquired heart diseases in children and ***,its pathogenesis is still unclear,and effective treatments are *** study aimed to investigate the regulatory pathway by which exosomes alleviate ferroptosis in cardiomyocytes(CMCs)induced by coxsackievirus B3(CVB3).CVB3 was utilized for inducing the VMC mouse model and cellular *** echocardiography,left ventricular ejection fraction(LVEF),and left ventricular fractional shortening(LVFS)were implemented to assess the cardiac *** CVB3-induced VMC mice,cardiac insufficiency was observed,as well as the altered levels of ferroptosis-related indicators(glutathione) peroxidase 4(GPX4),glutathione(GSH),and malondialdehyde(MDA).However,exosomes derived from human umbilical cord mesenchymal stem cells(hucMSCs-exo)could restore the changes caused by CVB3 ***-7a-5p was enriched in hucMSCs-exo,and the inhibitory ffect of hucMSCs-exoa-ie-pmimo on CVB3-induced ferroptosis was higher than that of hucMSCs-exommie N(NC:negative control).Mothers against decapentaplegic homolog 2(SMAD2)increased in the VMC group,while the expression of zinc-finger protein 36(ZFP36)***-7a-5p was confirmed to interact with SMAD2 messenger RNA(mRNA),and the SMAD2 protein interacted directly with the ZFP36 *** SMAD2 and overexpressing ZFP36 inhibited the expression of ferroptosis-related ***,the levels of GPX4,solute carrier family 7,member 11(SLC7A11),and GSH were lower in the SMAD2 overexpression plasmid(oe-SMAD2)+let-7a-5p mimic group than in the oe-NC+let-7a-5p mimic group,while those of MDA,reactive oxygen species(ROS),and Fe^(2+)*** conclusion,these data showed that ferroptosis could be regulated by mediating SMAD2 ***-let-7a-5p derived from hucMSCs could mediate SMAD2 to promote the expression of ZFP36,which further inhibited the ferroptosis of CMCs to alleviate CVB3-induced VMC.

关键词： Exosome Let-7a-5p Mothers against decapentaplegic homolog 2(SMAD2) Coxsackievirus B3(CVB3) Ferroptosis

Accurate design of spatially separated double active site in Bi_(4)NbO_(8)Cl single crystal to promote Z-Scheme photocatalytic overall water splitting

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Journal of Energy Chemistry 2023年第12期87卷 568-582,I0014页

作者： Kailong Gao Hongxia Guo yanan hu Hongbin He Mowen Li Xiaoming Gao Feng Fu Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Yanneng-Yanda Comprehensive Energy Industry Technology Research Institute Shaanxi Modern Industrial College of Green and Efficient Utilization of Energy ResourcesShaanxi Collaborative Innovation Center of Clean Utilization of Low Rank CoalShaanxi Key Laboratory of Chemical Reaction EngineeringDepartment of Chemistry and Chemical EngineeringYan’an UniversityYan’an 716000ShaanxiChina

The efficiency of photocatalytic overall water splitting was mainly limited by the slow reaction kinetics of water *** to design effective surface active site to overcome the slow water oxidation reaction was a major ***,we propose a strategy to accelerate surface water oxidation through the fabrication spatially separated double active ***/Bi_(4)NbO_(8)Cl-OVs photocatalyst with spatially separated double active site was prepared by hydrogen reduction photoanode deposition *** to the high matching of the spatial loading positions of FeCoPi and OVs with the photogenerated charge distribution of Bi_(4)NbO_(8)Cl and corresponding reaction mechanisms of substrate,the FeCoPi and OVs on the(001)and(010)crystal planes of Bi_(4)NbO_(8)Cl photocatalyst provided surface active site for water oxidation reaction and electron shuttle reaction(Fe^(3+)/Fe^(2+)),*** visible light irradiation,the evolution O_(2)rate of FeCoPi/Bi_(4)NbO_(8)Cl OVs was 16.8μmol h^(-1),as 32.9 times as Bi_(4)NbO_(8)***,a hydrogen evolution co-catalyst PtRu@Cr_(2)O_(3)was prepared by sequential photodeposition *** to the introduction of Ru,the Schottky barrier between PbTiO_(3)and Pt was effectively reduced,which promoted the transfer of photogenerated electrons to PtRu@Cr_(2)O_(3)thermodynamically,the evolution H_(2)rate on PtRu@Cr_(2)O_(3)/PbTiO_(3)increased to 664.8 *** based of the synchronous enhancement of the water oxidation performance on FeCoPi/Bi_(4)NbO_(8)Cl-OVs and water reduction performance on PtRu@Cr_(2)O_(3)/PbTiO_(3),a novel Z-Scheme photocatalytic overall water splitting system(FeCoPi/Bi_(4)NbO_(8)Cl-OVs)mediated by Fe^(3+)/Fe^(2+)had successfully *** visible light irradiation,the evolution rates of H_(2)and O_(2)were 2.5 and 1.3μmol h^(-1),*** work can provide some reference for the design of active site and the controllable synthesis of OVs spatial *** the other hand,the hydr

关键词： Spatially separated double active sites FeCoPi/Bi_(4)NbO_(8)Cl-OVs Photocatalytic water oxidation Photocatalytic hydrogen evolution Hydrogen evolution co-catalyst PtRu@Cr_(2)O_(3) Z-Scheme photocatalytic overall water splitting system

Electrospinning of antibacterial and anti-inflammatory Ag@hesperidin core-shell nanoparticles into nanofibers used for promoting infected wound healing

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Regenerative Biomaterials 2022年第1期9卷 314-324页

作者： Xiuli Ren yanan hu Linna Chang Shibo Xu Xifan Mei Zhenhua Chen Jinzhou Medical University Jinzhou 121001China

Bacterial infection and excessive inflammation are still the main obstacles to wound ***,antibacterial and antiinflammation nanomaterials are always attracting for infected wound *** this work,ultra-uniform(-20 nm)and colloidally stable Ag nanoparticles(Ag-Hes NPs)with core-shell structure were prepared by using hesperidin as reducing and capping *** obtained Ag-Hes NPs present effective antibacterial properties on both Staphylococcus aureus and Escherichia ***-Hes NPs also got high 1,1-diphenyl-1-picrylhydrazyl scavenging capability of 69%.Under the package of polyvinyl alcohol and sodium alginate,Ag-Hes NPs were encapsulated into electro spun nanofibers to form hydrogel(Ag-Hes@H).This strategy provides a moisture environment which could enrich and release Ag-Hes NPs *** experiments and animal wound healing investigation proved that Ag-Hes@H could promote the proliferation and migration of human umbilical vein endothelial cells and accelerate infected wound ***,Ag-Hes@H significantly reduced the expression of inflammatory cytokines,including IL-6,MMP9 and TNF-α.Immunohistochemistry data further suggested that Ag-Hes@H accelerated wound closure by promoting collagen deposition and skin cell *** designed antibacterial and anti-inflammatory Ag-Hes@H has great potential for promoting infected wound healing.

关键词： antibacterial hydrogel Ag nanospheres wound healing anti-inflammation

One-step synthesis of novel core-shell bimetallic hexacyanoferrate for high performance sodium-storage cathode

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Journal of Materials Science & Technology 2022年第19期114卷 180-190页

作者： Daxian Zuo Cuiping Wang Jiajia Han Qinghao Han yanan hu Junwei Wu huajun Qiu Qian Zhang Xingjun Liu College of Materials and Fujian Key Laboratory of Materials Genome and Xiamen Key Laboratory of High Performance Metals and Materials Xiamen UniversityXiamen 361005China Institute of Materials Genome and Big Data Harbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China

Recently, the design of core-shell hierarchical architecture plays an important role in improving the electrochemical performance of Prussian blue analogue cathodes(PBAs). Unfortunately, the inconvenient stepwise preparation and the strict lattice-matching requirement have restricted the development of coreshell PBAs. Herein, we demonstrate a one-step synthesis strategy to synthesize core-shell manganese hexacyanoferrate(MnFeHCF@MnFeHCF) for the first time. And the formation mechanism of the core-shell hierarchical architecture is investigated by first-principles calculations. It is found that the as-obtained Mn FeHCF@MnFeHCF act out the superior intrinsic natures, which not only can obtain a larger specific surface area and lower Fe(CN)_(6) vacancies but also can activate more Na-storage sites. Compared with the manganese hexacyanoferrate(MnHCF), the iron hexacyanoferrate(FeHCF), and even the traditional coreshell nickel hexacyanoferrate(FeHCF@NiHCF) prepared by a stepwise method, the Mn Fe HCF@MnFeHCF demonstrates a superior rate performance, which achieves a high capacity of 131 mAh g^(−1) at 50 mA g^(−1) and delivers a considerable discharge capacity of about 100 mAh g^(−1) even at 1600 mA g^(−1). Meantime, the capacity retention can reach up to nearly 80% after 500 cycles. The improved performances could be mainly originated from two aspects: on the one hand, Mn substitution is helpful to enhance the material conductivity;on the other hand, the core-shell structure with matched lattice parameters is more favorable to enhance the diffusion coefficient of sodium ions. Beside, the structural transformation of MnFeHCF@MnFeHCF upon the extraction/insertion of sodium ions is instrumental in releasing the interior stress and effectively maintaining the integrity of the crystal structure.

关键词： Cathode Prussian blue analogue Core-shell structure First-principles calculations Electrochemical performance

Wavelength and oscillator strength of dipole transition 1s^22p—1s^2nd for Mn^(22+) ion

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Science China(Physics,Mechanics & Astronomy) 2008年第11期51卷 1633-1637页

作者： WANG ZhiWen, WANG yanan, hu MuHong, LI XinRu & LIU Ying School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China 1. School of Physics and Electronic Technology Liaoning Normal University Dalian 116029 China

The transition energies, wavelengths and dipole oscillator strengths of 1s22p-1s2nd (3≤n≤9) for Mn22+ ion are calculated. The fine structure splittings of 1s2nd (n≤9) states for this ion are also evaluated. In calculating energy, the higher-order relativistic contribution is estimated under a hydrogenic approximation. The quantum defect of Rydberg series 1s2nd is determined according to the quantum defect theory. The results obtained in this paper excellently agree with the experi-mental data available in literatures.

关键词： Mn22+ ion transition energy fine structure splitting quantum defect oscillator strength

A Spatio-Temporal Heterogeneity Data Accuracy Detection Method Fused by GCN and TCN

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Computer Systems Science & Engineering 2023年第11期47卷 2563-2582页

作者： Tao Liu Kejia Zhang Jingsong Yin Yan Zhang Zihao Mu Chunsheng Li yanan hu School of Computer&Information Technology Northeast Petroleum UniversityDaqing163318China School of Qinhuangdao Northeast Petroleum UniversityQinhuangdao066004China

Spatio-temporal heterogeneous data is the database for decisionmaking in many fields,and checking its accuracy can provide data support for making *** to the randomness,complexity,global and local correlation of spatiotemporal heterogeneous data in the temporal and spatial dimensions,traditional detection methods can not guarantee both detection speed and ***,this article proposes a method for detecting the accuracy of spatiotemporal heterogeneous data by fusing graph convolution and temporal convolution ***,the geographic weighting function is introduced and improved to quantify the degree of association between nodes and calculate the weighted adjacency value to simplify the complex ***,design spatiotemporal convolutional units based on graph convolutional neural networks and temporal convolutional networks to improve detection speed and ***,the proposed method is compared with three methods,ARIMA,T-GCN,and STGCN,in real scenarios to verify its effectiveness in terms of detection speed,detection accuracy and *** experimental results show that the RMSE,MAE,and MAPE of this method are the smallest in the cases of simple connectivity and complex connectivity degree,which are 13.82/12.08,2.77/2.41,and 16.70/14.73,***,it detects the shortest time of 672.31/887.36,*** addition,the evaluation results are the same under different time periods of processing and complex topology environment,which indicates that the detection accuracy of this method is the highest and has good research value and application prospects.

关键词： Spatiotemporal heterogeneity data data accuracy complex topology structure graph convolutional networks temporal convolutional networks