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Representation of the Stratospheric Circulation in CRA-40 Reanalysis:The Arctic Polar Vortex and the Quasi-Biennial Oscillation

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Advances in Atmospheric Sciences 2024年第5期41卷 894-914页

作者： Zixu WANG Shirui YAN Jinggao HU Jiechun DENG Rongcai ren Jian RAO Key Laboratory of Meteorological Disaster Ministry of Education(KLME)Joint International Research Laboratory of Climate and Environment Change(ILCEC)Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing 210044China Key Laboratory for Semi-Arid Climate Change of the Ministry of Education College of Atmospheric SciencesLanzhou UniversityLanzhou 730000China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

The representation of the Arctic stratospheric circulation and the quasi-biennial oscillation(QBO)during the period 1981–2.19 in a 40-yr Chinese global reanalysis dataset(CRA-40)is evaluated by comparing two widely used reanalysis datasets,ERA-5 and ***-40 demonstrates a comparable performance with ERA-5 and MERRA-2.in characterizing the winter and spring circulation in the lower and middle Arctic ***,differences in the climatological polar-mean temperature and polar night jet among the three reanalyses are within±0.5 K and±0.5 m s^(–1),*** onset dates of the stratospheric sudden warming and stratospheric final warming events at 10 hPa in CRA-40,together with the dynamics and circulation anomalies during the onset process of warming events,are nearly identical to the other two reanalyses with slight *** contrast,the CRA-40 dataset demonstrates a deteriorated performance in describing the QBO below 10 hPa compared to the other two reanalysis products,manifested by the larger easterly biases of the QBO index,the remarkably weaker amplitude of the QBO,and the weaker wavelet power of the QBO *** pronounced biases are mainly concentrated in the period 1981–98 and largely reduced by at least 39%in 1999–***,particular caution is needed in studying the QBO based on *** three reanalyses exhibit greater disagreement in the upper stratosphere compared to the lower and middle stratosphere for both the polar region and the tropics.

关键词： CRA-40 ERA-5 MERRA-2 Arctic stratosphere the QBO

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A new method to improve surface morphology of ni-Fe-Mo-Co alloy electrode and its catalytic activity for HER

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Rare Metals 2007年第3期26卷 205-212页

作者： LUO Beiping ren Buye XU You ZHENG Yajie department of Chemistry and Chemical Engineering Hunan Institute of Science and Technology Yueyang 414000 China College of Metallurgical Science and Engineering Central South University Changsha 410083 China Research Institute of Materials Science South China University of Technology Guangzhou 510640 China

A new pretreatment method has been developed to improve the catalytic activity of the ni-Fe-Mo-Co alloy electrode for hydrogen evolution reaction （HER）. The procedure involves pre-electrolyzing the ni-Fe-Mo-Co alloy electrode in 30% KOH solution containing 10% potassium sodium tartrate at 70℃ for 2.h, until some of the Mo and Fe elements are leached out. The surface morphology of the ni-Fe-Mo-Co alloy demonstrates a unique hive-like structure after the pre- treatment, which has the pore size in a nanometer range （about 50 nm）, a very large real surface area, and good stability. The results of the electrochemical studies show that compared to other similar electrode materials and the treated ni-Fe-Mo-Co electrode by leaching method, the pre-treated ni-Fe-Mo-Co electrode has a much lower overpotential and much higher exchange current density for HER. In addition, a long-term continuous electrolysis test with a current interruption shows that the ni-Fe-Mo-Co alloy has excellent catalytic stability.

关键词： catalytic activity surface treatment ni-Fe-Mo-Co alloy hydrogen evolution electrodeposition

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Shell model calculations for the allowed Gamow-Teller β-decays of light nuclei

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Science China(physics,Mechanics & Astronomy) 2014年第6期57卷 1005-1012页

作者： LI HanTao ren zhongzhou department of physics and Key Laboratory of Modern Acoustics Institute of AcousticsNanjing University Joint Center of Nuclear Science and Technology Nanjing University Center of Theoretical Nuclear physics National Laboratory of Heavy-Ion Accelerator

The allowed Gamow-Teller β-decay information of Li, Be, B, C, and N isotopes under the flame work of nuclear shell model is calculated herein. Theoretical results of Q values, half-lives, excitation energies, log ft values, branching fractions, and β-delayed proton/neutron emission probabilities are tabulated and compared with experimental data. The deviations from the observations are also analyzed. The llBe nucleus is well known for its anomaly ground state Jπ=1/2.. Thus, we compared the theoretical energy levels with the experimental data and the agreements for low excitation states are consistent. The quenching factor is also evaluated and discussed.

关键词： light nuclei Gamow-Teller β-decay nuclear shell model

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Microstructure evolution of an ni-Cr-Co base superalloy heat-treated at 704 and 760℃

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Rare Metals 2003年第3期22卷 169-174页

作者： ZHAOShuangqun XIEXishan HighTemperatureMaterialsResearchlaboratories UniversityofScienceandTechnologyBeijingBeijing100083China；DepartmentofPhysicsNingxiaUniversityYinchuan750021China HighTemperatureMaterialsResearchLaboratories UniversityofScienceandTechnologyBeijingBeiiing100083China

Thermodynamic calculation, SEM (scanning electron microscopy), TEM(transmission electron microscopy), XRD (X-ray diffraction), phase extraction, and chemical analysiswere employed to study the phase stability and phase precipitation in a new ni-Cr-Co basesuperalloy heat-treated at 704 and 760 ℃ for a long tune. The results show that the precipitates ofthis new alloy heat-treated at standard annealing condition and heat-treated at 704 and 760℃ for atime up to 2.00 h are γ′, MC, M_(2.)C_6, and M_6C, and η phase forms at grain boundaries and inmatrix of samples heat-treated at 760 ℃ as well. The mass fractions of γ′ (+η), MC, M_(2.)C_6,and M_6C in all samples have no large changes with an increase in aging time, but γ′ precipitatesgrow obviously. The γ′-to-η transformation in the samples heat-treated at 760℃ took place withincreasing aging time. The η precipitates form a Widmanstaetten pattern and the γ′ phases haveremelted partly in the samples heat-treated at 760 ℃. The alloy maintains a better microstructuralstability during prolonged aging at 704 ℃, but a worse microstructural stability during prolongedaging at 760 ℃.

关键词： ni-Cr-Co base superalloy thermodynamic calculation microstructuralstability precipitate phase analysis

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An interpolating boundary element-free method (IBEFM) for elasticity problems

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Science China(physics,Mechanics & Astronomy) 2010年第4期53卷 758-766页

作者： ren HongPing 1 , CHENG YuMin 2.& ZHANG Wu 1 1 School of Computer Engineering and Science, Shanghai {2., Shanghai 2.0072. China 2.Shanghai Institute of Applied Mathematics and Mechanics, Shanghai {2., Shanghai 2.0072. China 1. School of Computer Engineering and Science Shanghai University Shanghai 200072 China2. Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

The paper begins by discussing the interpolating moving least-squares (IMLS) method. Then the formulae of the IMLS method obtained by Lancaster are revised. On the basis of the boundary element-free method (BEFM), combining the boundary integral equation method with the IMLS method improved in this paper, the interpolating boundary element-free method (IBEFM) for two-dimensional elasticity problems is presented, and the corresponding formulae of the IBEFM for two-dimensional elasticity problems are obtained. In the IMLS method in this paper, the shape function satisfies the property of Kronecker δ function, and then in the IBEFM the boundary conditions can be applied directly and easily. The IBEFM is a direct meshless boundary integral equation method in which the basic unknown quantity is the real solution to the nodal variables. Thus it gives a greater computational precision. Numerical examples are presented to demonstrate the method.

关键词： moving least-squares (MLS) approximation interpolating moving least-squares (IMLS) method boundary integral equation meshless method boundary element-free method (BEFM) interpolating boundary element-free method (IBEFM) elasticity problem

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Research progress in failure mechanisms and electrolyte modification of high-voltage nickel-rich layered oxide-based lithium metal batteries

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InfoMat 2024年第2期6卷 57-75页

作者： Jiandong Liu Xinhong Hu Shihan Qi Yurong ren Yong Li Jianmin Ma School of Chemistry Tiangong UniversityTianjinthe People's Republic of China School of physics and Electronics Hunan UniversityChangshathe People's Republic of China School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringChangzhou UniversityChangzhouthe People's Republic of China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power SourcesShanghaithe People's Republic of China

High-voltage nickel(ni)-rich layered oxide-based lithium metal batteries(LMBs)exhibit a great potential in advanced batteries due to the ultra-high energy ***,it is still necessary to deal with the challenges in poor cyclic and thermal stability before realizing practical application where cycling life is *** many improved strategies,mechanical and chemical stability for the electrode electrolyte interface plays a key role in addressing these ***,extensive effort has been made to address the challenges of electrode-electrolyte *** this progress,the failure mechanism of ni-rich cathode,lithium metal anode and electrolytes are reviewed,and the latest breakthrough in stabilizing electrode-electrolyte interface is also ***,the challenges and future research directions of ni-rich LMBs are put forward.

关键词： electrode-electrolyte interface electrolyte modification failure mechanisms high voltage lithium metal anode nickel-rich layered oxide cathode

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Diagnosis of phasma in CCD damage process induced by laser

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Chinese Journal of Lasers 1993年第5期 81-85页

作者： Jian Lu, Xiao wu ni, An-zhi He(department of Applied {2.,{2. of Science Technology, 2.0 Xiaolingwei, nanjing 2.0014 ,China)

In this paper, the shapes of plasma produced by a Q-switched YAG laser acted repeatedly upon a CCD with MOS structure are used, to investigate the destroying process of the optoelectronic device. The experimental resu... 详细信息

关键词： CCD device MOS structure laser damage optical breakdown plasma

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Chain Elongation Using Native Soil Inocula:Exceptional n-Caproate Biosynthesis Performance and Microbial Mechanisms

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Engineering 2024年第8期39卷 262-272页

作者： Lin Deng Yang Lv Tian Lan Qing-Lian Wu Wei-Tong ren Hua-Zhe Wang Bing-Jie ni Wan-Qian Guo State Key Laboratory of Urban Water Resource and the Environment Harbin Institute of TechnologyHarbin 150090China Centre for Technology in Water and Wastewater&School of Civil and Environmental Engineering University of Technology SydneySydneyNSW 2007Australia

This study demonstrates the feasibility and effectiveness of utilizing native soils as a resource for inocula to produce n-caproate through the chain elongation(CE)platform,offering new insights into anaerobic soil *** results reveal that all five of the tested soil types exhibit CE activity when supplied with high concentrations of ethanol and acetate,highlighting the suitability of soil as an ideal source for n-caproate *** with anaerobic sludge and pit mud,the native soil CE system exhibited higher selectivity(60.53%),specificity(82.32.),carbon distribution(60.00%),electron transfer efficiency(165.00%),and conductivity(0.59 ms∙cm^(-1)).Kinetic analysis further confirmed the superiority of soil in terms of a shorter lag time and higher yield.A microbial community analysis indicated a positive correlation between the relative abundances of Pseudomonas,Azotobacter,and Clostridium and n-caproate ***,metagenomics analysis revealed a higher abundance of functional genes in key microbial species,providing direct insights into the pathways involved in n-caproate formation,including in situ CO_(2.utilization,ethanol oxidation,fatty acid biosynthesis(FAB),and reverse beta-oxidation(RBO).The numerous functions in FAB and RBO are primarily associated with Pseudomonas,Clostridium,Rhodococcus,Stenotrophomonas,and Geobacter,suggesting that these genera may play roles that are involved or associated with the CE ***,this innovative inoculation strategy offers an efficient microbial source for n-caproate production,underscoring the importance of considering CE activity in anaerobic soil microbial ecology and holding potential for significant economic and environmental benefits through soil consortia exploration.

关键词： Soil Chain elongation n-caproate Reverse beta-oxidation Fatty acid biosynthesis Metagenomics

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Magnetism induced by nonmagnetic dopants in zinc-blende SiC: First-principle calculations

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Science China(physics,Mechanics & Astronomy) 2010年第1期53卷 1-10页

作者： LIU ZhaoQing & ni Jun department of {2. and Key Laboratory of Atomic and Molecular Nanoscience (Ministry of Education), Tsinghua {2., Beijing 100084, China 1. department of physics and Key Laboratory of Atomic and Molecular Nanoscience (Mi{2.stry of Education) Tsinghua University Beijing 100084 China

Magnetism induced by the nonmagnetic dopants in the zinc-blende SiC (3C-SiC) is investigated by first-principle calculations. The atoms of the first 2. elements in the periodic table except inert gas are used to replace either Si or C atoms as dopants. We find that some nonmagnetic substitutional dopants (mainly the Group IA, Group IIA, Group IIIB, and Group VIIB elements) prefer the spin-polarized ground states with local magnetic moments. In general, the condition for obtaining the local magnetic moments and the magnetic ground state requires that the dopants are p-type and have large electronegativity difference from the neighboring host atoms. The magnetic moments can be tuned over a range between 1 μ B and 3 μ B by doping with the nonmagnetic elements. The nearest-neighbor exchange couplings J 0 between the local magnetic moments are quite large and the codoping method is proposed to increase the dopant concentration. These imply that the nonmagnetic doping in SiC may exhibit collective magnetism. Moreover, the Group IIA Mg and Ca atoms substituting the preferred Si atoms favor the ferromagnetic ground states with the half-metallic electronic properties, which suggests that Mg or Ca substitutional doping on the Si sites in SiC could be a potential route to fabricating the diluted magnetic semiconductors.

关键词： nonmagnetic dopant magnetism SiC diluted magnetic semiconductor first-principle calculation

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新型超导材料MgCni_3的电子结构与超导电性研究

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物理学报 2004年第3期53卷 922-926页

作者：陈丽李华山东大学物理与微电子学院

用MS Xα方法研究了非氧化物超导材料MgCni3的电子结构 .研究结果显示 ,态密度分布曲线的主峰靠近Fermi面 ,主要来自于ni的d电子的贡献 .用T(T =Co ,Mn ,Cu)替代MgCni3中的部分ni形成化合物MgCni2.T ,替代使ni的价电子数减小 ,价态发生... 详细信息

用MS Xα方法研究了非氧化物超导材料MgCni3的电子结构 .研究结果显示 ,态密度分布曲线的主峰靠近Fermi面 ,主要来自于ni的d电子的贡献 .用T(T =Co ,Mn ,Cu)替代MgCni3中的部分ni形成化合物MgCni2.T ,替代使ni的价电子数减小 ,价态发生变化 ,Fermi面处态密度N(EF)减小 .计算结果表明 :无论是电子掺杂 (Cu)还是空穴掺杂 (Co ,Mn) ,MgCni3的超导电性都被抑制 ;Mn掺杂比Co掺杂更快地抑制超导电性。

关键词：超导材料电子结构态密度超导电性镍碳镁材料 Fermi面电子掺杂空穴掺杂

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