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ti_(3)C_(2)t_(x)MXene wrapped,carbon-coated porous Si sheets for improved lithium storage performance

Chinese Chemical Letters 2024年第2期35卷 617-621页

作者： Hui Cheng Yueming Liu Zhongling Cheng Xianying Wang Na huang Haijiao Zhang Institute of Nanochemistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Energy Materials Research Center AG Hydrogen Materials & Devices CAS Key Laboratory of Materials for Energy ConversionShanghai Institute of CeramicsChinese Academy of Sciences (SICCAS)Shanghai 200050China

Si-based materials have shown great potential as lithium-ion batteries(LIBs)anodes due to their natural reserves and high theoretical ***,the large volume changes during cycles and poor conductivity of Si lead to rapid capacity decay and poor cycling stability,ultimately limiting their commercial ***,we have skillfully utilized the microporous MCM-22 zeolite as the unique silicon source to produce porous Si(pSi)sheets by a simple magnesiothermic reduction,followed by a carbon coating and further ti_(3)C_(2)t_(x)MXene assembly,obtaining the ternary pSi@NC@tNSs *** the design,porous Si sheets provide more active sites and shorten Li-ion transport paths for electrochemical *** N-doped carbon(NC)layer serves as a bonding layer to couple pSi and ti_(3)C_(2)t_(x).the conductive network formed by 2D ti_(3)C_(2)t_(x)and medium NC layer effectively enhances the overall charge transport of the electrode material,and helps to stabilize the electrode ***,the as-made pSi@NC@tNSs anode delivers an improved lithium storage performance,exhibiting a high reversible capacity of 925 mAh/g at 0.5 A/g after 100 *** present strategy provides an effective way towards high-performance Si-based anodes for LIBs.

关键词： Si anodes ti_(3)C_(2)ti_(x)MXene Porous structure Interfacial assembly Lithium-ion batteries

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Defect-modulated and heteroatom-functionalized ti_(3−x)C_(2)t_(y)MXene 3D nanocavities induce growth of MoSe_(2)nanoflakes toward electrocatalytic hydrogen evolution in all pH electrolytes

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Nano Research 2024年第7期17卷 6294-6304页

作者： Ming Du Xianzhi Yang Jian Zhang Wei Chen Huajie huang Xinbao Zhu Xing’ao Li State Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Centre for Advanced Materials(SICAM)Nanjing University of Posts and Telecommunications(NJUPT)Nanjing 210023China College of Electronic and Optical Engineering and College of Flexible Electronics Nanjing University of Posts and telecommunications(NJUPt) Nanjing 210023China New Energy technology Engineering Lab of Jiangsu Province College of ScienceNanjing University of Posts and Telecommunications(NJUPT)Nanjing 210023China College of Pharmaceutical and Chemical Engineering Taizhou UniversityJiaojiang 318000China College of Mechanics and Materials Hohai UniversityNanjing 210098China College of Chemical Engineering Nanjing Forestry UniversityNanjing 210037China

Reducing kinetic energy barriers and developing accessible active sites are critical to deliver high hydrogen evolution reaction(HER)*** this paper,we synthesized defect-modulated and heteroatom(boron)-functionalized three-dimensional(3D)bowl-shaped ti_(3−x)C_(2)t_(y)MXene(B-tCt)nanocavities coupled with the vertical growth of MoSe_(2)*** B-tCt@MoSe_(2)nanohybrids catalyst delivers the overpotentials of 49.9,52.7,and 67.8 mV to reach a HER current density of 10 mA·cm^(−2)under acidic,alkaline,and neutral conditions,*** outstanding HER activity is predominantly attributed to the heteroatom functionalization,self-adapting ti vacancy(Vti)defect modulation,and spatial configuration design in the 3D B-tCt nanocavity,which synergistically regulate the electronic structure,activate the basal plane/edge unsaturated sites,and reduce the reaction energy *** and theoretical calculations demonstrate that strong heterogeneous interfacial bonding interactions between B-tCt and MoSe_(2)can dramatically reduce the free energy of hydrogen adsorption and facilitate efficient interfacial charge migration,thus essentially improving the HER *** used this 3D porous nanohybrid system assembled by defectrich lamellar structures to elucidate the advantageous synergistic effects of multiple mechanisms among defect structure,heteroatom functionalization,and interfacial coupling,which provided important insights for the development of efficient hybridtype catalysts.

关键词： electrocatalytic H_(2)evolution three-dimensional(3D)MXene nanocavity MoSe_(2)nanoflake self-adapting ti vacancy defect heteroatom-functionalized interfacial interaction

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Comparison of toxicity between lanthanum oxide nanoparticles and lanthanum chloride

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Journal of Rare Earths 2024年第2期42卷 424-430,I0007页

作者： Kun huang Songchang Lai Miao Guo Xingwu Zhu Jiashuangwei Yuan Zhehao Liu Gonghua Hu Yanfang Gao School of Public Health and Health Management Gannan Medical UniversityGanzhou341000China

Due to the wide application of rare earth elements,lanthanum(La) is gradually accumulated in our living *** can enter the body through a variety of routes,which has a series of effects on various *** a consequence,the safety of lanthanum deserves our *** study aims to compare the toxicity of lanthanum oxide nanoparticles(La_(2)O_(3) NPs) and lanthanum chloride(LaCl_(3)) and enrich the toxicity evaluation of ***,a 30 d intragastal experiment was conducted.C57BL/6j mice were given by La_(2)O_(3) NPs solution and LaCl_(3) solution respectively at doses of 0,30,60 and120 mg/kg BW(lanthanum content).the results show that,compared with the control group,both La_(2)O_(3)NPs and LaCl_(3) can reduce the body weight of female mice in the high-dose group,but for male mice,the high-dose La_(2)O_(3) NPs solution can increase the body weight,while LaCl_(3) has the opposite *** coefficients of liver,kidney,heart,lung,uterine and ovaries increase first and then decrease with the exposure dose,but testes and epididymides coefficient keep increasing with the exposure of LaCl_(3) and La_(2)O_(3) ***_(2)O_(3) NPs and LaCl_(3) can reduce the concentration of triglycerides(tG) and increase the level of low density lipoprotein(LDL),but the effect of La_(2)O_(3) NPs is more ***_(2)O_(3) NPs and LaCl_(3) can reduce the concentration of malondialdehyde(MDA),increase the total antioxidant capacity(t-AOC)and enhance the activity of catalase(CAt),but LaCl_(3) has more obvious protective effects on oxidative ***_(2)O_(3) NPs and LaCl_(3) have potential risks to liver,and the toxicity of La_(2)O_(3) NPs might be higher than that of LaCl_(3).

关键词： Rare earth elements Lanthanum oxide nanoparticles Lanthanum chloride Lipid metabolism Oxidative stress

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An isolated symmetrical 2t2R cell enabling high precision and high density for RRAM-based in-memory computing

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Science China(Information Sciences) 2024年第5期67卷 287-294页

作者： Yaotian LING Zongwei WANG Yuhang YANG Lin BAO Shengyu BAO qishen WANG Yimao CAI Ru huang School of Integrated Circuits Beijing Advanced Innovation Center for Integrated Circuits Peking University State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

In-memory computing(IMC), leveraging emerging memories, holds significant promise in overcoming memory limitations and improving energy efficiency. However, the prevailing IMC array structure based on serially connected transistors and memory cells(1t1R/2t2R), along with the signed weight mapping scheme, can lead to asymmetrical weight sensing issues(AWS) due to electrical asymmetry within the1t1R/2t2R structure, particularly in highly scaled cells where the transistor's resistance becomes significant. In this paper, we propose and fabricate an electrically symmetric memory cell based on a physically isolated 2t2R structure for IMC. this design aims to enhance the precision and density of RRAM-based IMC arrays. the 2t2R cells are manufactured using the back-end-of-line(BEOL) process of a commercial40 nm technology platform. the feasibility of this design is verified through measured and simulated results,showcasing its capability to address the issue of AWS. Compared to conventional 2t2R cells, this design achieves a considerably smaller transistor footprint without compromising accuracy, while also improving integration density by 42.2%. these innovative memory cell advancements have the potential to further advance high-energy-efficient IMC technology.

关键词： RRAM 2t2R multi-level storage weight asymmetry in-memory computing

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Microstructure Evolution and Mechanical Properties of Friction Stir Welded Al-Cu-Li Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 855-871页

作者： Peng Chen Wenhao Chen Jiaxin Chen Zhiyu Chen Yang tang Ge Liu Bensheng huang Zhiqing Zhang School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China Sichuan Provincial Engineering Research Center of Advanced Materials Manufacturing technology for Shale Gas High-Efficient Exploitation Southwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China School of Robot Engineering Yangtze Normal UniversityChongqing 408100China

the investigation concentrates on friction stir welded(FSW)Al-Cu-Li alloy concerning its local microstructural evolution and mechanical *** grain features were characterized by electron back scattered diffraction(EBSD)technology,while precipitate characterization was conducted by using transmission electron microscopy(tEM)aligned along[011]Al and[001]Al zone *** mechanical properties are evaluated through micro-hardness and tensile *** can be found that nugget zones exhibit finely equiaxed grains evolved through complete dynamic recrystallization(DRX),primarily occurring in continuous dynamic recrystallization(CDRX)and discontinuous dynamic recrystallization(DDRX).In the thermal-mechanically affected zone(tMAZ),numerous sub-structured grains,exhibiting an elongated morphology,were created due to partial DRX,signifying the dominance of CDRX,DDRX,and geometric dynamic recrystallization(GDRX)in this region.t_(1)completely dissolves in the nugget zone(NZ)leading to the formation of Guinier-Preston zones and increase ofδ′,β′and S′.Conversely,t_(1)partially solubilizes in tMAZ,the lowest hardness zone(LHZ)and heat affected zone(HAZ),and the residual t_(1)undergoes marked coarsening,revealing various t_(1)*** solubilization and coarsening of t_(1)are primary contributors to the degradation of hardness and strength.θ′primarily dissolves and coarsens in NZ and tMAZ,whilst this precipitate largely coarsens in HAZ and LHZ.σ,tB,grain boundary phases(GBPs)and precipitate-free zone(PFZ)are newly generated during FSW.σexists in the tMAZ,LHZ and HAZ,whereas tB nucleates in *** and PFZ mostly develop in LHZ and HAZ,which can cause strain localization during tensile deformation,potentially leading to LHZ joint fracture.

关键词： Al-Cu-Li alloy Friction stir welding Microstructure evolution Mechanical properties

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Simulation of gas-solid flow characteristics of the circulating fluidized bed boiler under pure-oxygen combustion conditions

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Chinese Journal of Chemical Engineering 2024年第6期70卷 9-19页

作者： Kaixuan Gao Xiwei Ke Bingjun Du Zhenchuan Wang Yan Jin Zhong huang Yanhong Li Xuemin Liu Key Laboratory of Special Equipment Safety and Energy-Saving for State Market Regulation China Special Equipment Inspection&Research InstituteBeijing 100029China Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China School of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024China

Under the pressure of carbon neutrality,many carbon capture,utilization and storage technologies have witnessed rapid development in the recent years,including oxy-fuel combustion(OFC)***,the conventional OFC technology usually depends on the flue gas recirculation system,which faces significant investment,high energy consumption,and potential low-temperature corrosion *** these deficiencies,the direct utilization of pure oxygen to achieve particle fluidization and fuel combustion may reduce the overall energy consumption and CO_(2)-capture *** this paper,the fundamental structure of a self-designed 130 t·h^(-1) pure-oxygen combustion circulating fluidized bed(CFB)boiler was provided,and the computational particle fluid dynamics method was used to analyze the gas-solid flow characteristics of this new-concept boiler under different working *** results indicate that through the careful selection of design or operational parameters,such as average bed-material size and fluidization velocity,the pure-oxygen combustion CFB system can maintain the ideal fluidization state,namely significant internal and external particle ***,the contraction section of the boiler leads to the particle backflow in the lower furnace,resulting in the particle suspension concentration near the wall region being higher than that in the center ***,the upper furnace still retains the classic core-annulus flow *** addition to increasing solid circulation rate by reducing the average bed-material size,altering primary gas ratio and bed inventory can also exert varying degrees of influence on the gas-solid flow characteristics of the pure-oxygen combustion CFB boiler.

关键词： Circulating fluidized bed Pure-oxygen combustion Gas-solid flow characteristics Simulation CO_(2)capture

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Invariance pressures for uncertain control systems

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Acta Mathematica Sinica,English Series 2024年

作者： Xing Fu ZHONG Yu huang School of Mathematics and Statistics Guangdong University of Foreign Studies School of Science Sun Yat-sen University

We provide three types of invariance pressure for uncertain control systems, namely, invariance pressure, strong invariance pressure, and invariance feedback pressure. the first two respectively extend the corresponding pressures for deterministic control systems proposed by Colonius, Cossich,and Santana (2018) and by Nie, Wang, and huang (2022); and the third generalizes invariance feedback entropy of uncertain control systems presented by tomar, Rungger, and Zamani (2020), by adding potentials on the control range. then we prove that (1) an explicit formula for invariance pressure of a controlled invariant set with respect to a potential by the logarithm of the spectral radius of the admissible weighted matrix determined by this potential under some suitable conditions;(2) an explicit formula for pressure of invariant quasi-partitions by maximum mean weight over all irreducible periodic sequences;(3) the invariance feedback pressure of a controlled invariant set is equal to the pressure of an atom partition under some technical assumptions;(4) lower and upper bounds for pressure of invariant quasi-partitions w.r.t. a potential by the logarithm of the spectral radius of the weighted adjacency matrix determined by this potential;(5) a variational principle for strong invariance pressure.

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Subclinical impairment of left ventricular myocardium function in type 2 diabetes mellitus patients with or without hypertension

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World Journal of Diabetes 2024年第6期15卷 1272-1279页

作者： Zeng-Guang Chen Guang-An Li Jun huang Li Fan Department of Cardiology The Affiliated Changzhou Second People’s Hospital with Nanjing Medical UniversityChangzhou 213000Jiangsu ProvinceChina Department of Echocardiography The Affiliated Changzhou Second People’s Hospital with Nanjing Medical UniversityChangzhou 213000Jiangsu ProvinceChina

BACKGROUND Cardiovascular disease has been the leading cause of morbidity and mortality for type 2 diabetes mellitus(t2DM)patients over the last *** to determine whether layer-specific global longitudinal strain(GLS)combined with peak strain dispersion(PSD)can be used to assess left ventricle(LV)myocardium systolic dysfunction in t2DM patients or without hypertension(HP).MEtHODS We enrolled 97 t2DM patients,70 t2DM+HP patients and 101 healthy ***-specific GLS and PSD were calculated by EchoPAC software in apical three-,four-and two-chamber *** of the epimyocardial,middle-layer and endomyocardial(GLSepi,GLSmid,and GLSendo)were measured and *** operating characteristic analysis was performed to detect LV myocardium systolic dysfunction in t2DM *** there were significant differences in GLSepi,GLSmid,GLSendo,and PSD between healthy subjects,t2DM patients and t2DM patients with HP(Ptrend tests yielded the ranking of healthy subjects>t2DM patients>t2DM with HP patients in the absolute values of GLSepi,GLSmid and GLSendo(Pthy subjectst2DMt2DM with HP(Ptic efficiency for detecting LV myocardium systolic dysfunction in t2DM patients,however,the area under the curve(AUC)for layer-specific GLS and PSD combined was significantly higher than the AUCs for the individual indices(Pted with LV myocardium systolic dysfunction in t2DM patients,t2DM patients with HP.t2DM patients with HP have more severe LV myocardium systolic dysfunction than t2DM patients without HP and normal control *** combination of layer-specific GLS and PSD may provide additional prognostic information for t2DM patients with or without HP.

关键词： type 2 diabetes mellitus Hypertension Speckle tracking echocardiography Global longitudinal strain Peak strain dispersion

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E3 ubiquitin ligase PbrAtL18 is a positive factor in pear resistance to drought and Colletotrichum fructicola infection

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Horticultural Plant Journal 2024年第3期10卷 698-712页

作者： Likun Lin qiming Chen Kaili Yuan Caihua Xing qinghai qiao Xiaosan huang Shaoling Zhang State Key Laboratory of Crop Genetics and Germplasm Enhancement/College of Horticulture Nanjing Agricultural UniversityNanjingJiangsu210095China

the Arabidopsis toxicos en Levadura(AtL)protein is a subfamily of the E3 ubiquitin ligases,which exists widely in plants and is extensively involved in plant growth and *** the AtL family has been identified in other species,such as Arabidopsis,Oryza sativa,and grapevine,few reports on pear AtL gene families have been *** this study,92 PbrAtL genes were identified and analyzed from the Pyrus breschneideri *** analysis and phylogenetic tree generation divided them into nine subgroups,and chromosome localization analysis showed that the 92 PbrAtL genes were distributed in 16 of 17 pear *** data and quantitative real-time polymerase chain reaction(qRt-PCR)experiments demonstrated that PbrAtL18,PbrAtL41,and PbrAtL88 were involved in both pear drought resistance and Colletotrichum fructicola *** addition,Arabidopsis thaliana overexpressing PbrAtL18 showed greater resistance to drought stress than the wild type(Wt),and PbrAtL18-silenced pear seedlings showed greater sensitivity to drought and *** infection than the ***18 regulated plant resistance by regulating chitinase(CHI),phenylalanine ammonia-lyase(PAL),polyphenol oxidase(PPO),catalase(CAt),peroxidase(POD),and superoxide dismutase(SOD)*** study provided a reference for further exploring the functions of the PbrAtL gene in drought resistance and *** infection.

关键词： Pear Colletotrichum fructicola Arabidopsis toxicos en Levadura(AtL) Drought stress

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Nonlinear optics of two-dimensional heterostructures

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Frontiers of physics 2024年第3期19卷 19-27页

作者： Xiangkun Zeng Chenyu Wan Zhichen Zhao Di huang Zhanshan Wang Xinbin Cheng tao Jiang MOE Key Laboratory of Advanced Micro-Structured Materials Shanghai Frontiers Science Center of Digital OpticsInstitute of Precision Optical Engineeringand School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Intelligent Science and technology Tongji UniversityShanghai 200092China

two-dimensional (2D) materials exhibit exceptionally strong nonlinear optical responses, benefiting from their reduced dimensionality, relaxed phase-matching requirements, and enhanced light-matter interaction. With additional degrees of freedom in the modulation of the physical properties by stacking 2D layers together, nonlinear optics of 2D heterostructures becomes increasingly fascinating. In this perspective, we provide a brief overview of recent advances in the field of nonlinear optics of 2D heterostructures, with a particular focus on their remarkable capabilities in characterization and modulation. Given the recent advances and the emergence of novel heterostructures, combined with innovative tuning knobs and advanced nonlinear optical techniques, we anticipate deeper insights into the underlying mechanisms and more associated applications in this rapidly evolving field.

关键词： nonlinear optics 2D heterostructures

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