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Semiconducting M_(2)X(M=Cu,Ag,Au;X=S,Se,Te)monolayers:A broad range of band gaps and high carrier mobilities

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Nano Research 2021年第8期14卷 2826-2830页

作者： Lei gao Yan-fang Zhang Shixuan Du Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Faculty of Science Kunming University of Science and TechnologyKunming 650000China CAS Key Laboratory of Vacuum Physics Beijing 100049China

Two-dimensional semiconductors(2DSCs)with appropriate band gaps and high mobilities are highly desired for future-generation electronic and optoelectronic ***,using first-principles calculations,we report a novel class of 2DSCs,group-11-chalcogenide monolayers(M_(2)X,M=Cu,Ag,Au;X=S,Se,Te),featuring with a broad range of energy band gaps and high carrier *** energy band gaps extend from 0.49 to 3.76 eV at a hybrid density functional level,covering from ultraviolet-A,visible light to near-infrared region,which are crucial for broadband ***,the calculated room-temperature carrier mobilities of the M_(2)X monolayers are as high as thousands of cm^(2)·V^(-1)·s^(-1).Particularly,the carrier mobilities ofε-Au_(2)Se and e-Au2Te are up to 104 cm^(2)·V^(-1)·s^(-1),which is very attracitive for electronic *** from the broad range of energy band gaps and superior carrier mobilities,the group-11-chalcogenide M_(2)X monolayers are promising candidates for future-generation nanoelectronics and optoelectronics.

关键词： two-dimensional semiconductors group-11-chalcogenides electronic properties first-principles calculations

Hyperbolic Metric and Normal Family

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Acta Mathematica Sinica,English Series 2014年第4期30卷 681-688页

作者： Cai yun fang Xue Cheng PANG School of Mathematical Sciences Fudan University School of Mathematical Sciences Nanjing Normal University Department of Mathematics East China Normal University

In this paper, we study the normality of the family of meromorphic functions from the viewpoint of hyperbolic metric. Then, a new sufficient and necessary condition is obtained, which can determine a given family of m... 详细信息

关键词： Hyperbolic metric normal family holomorphic function meromorphic function

Nitric Oxide Regulates Dark-Induced Leaf Senescence Through EIN2 in Arabidopsis

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Journal of Integrative Plant Biology 2012年第8期54卷 516-525页

作者： yun-Han Niu fang-Qing Guo The National Key Laboratory of Plant Molecular Genetics and National Center for Plant Gene Research(Shanghai) Institute of Plant Physiology&EcologyShanghai Institutes for Biological Sciencesthe Chinese Academy of SciencesShanghai 200032China

The nitric oxide （NO）-deficient mutant nosllnoal exhibited an early leaf senescence phenotype. ETHY- LENE INSENSITIVE 2 （EIN2） was previously reported to function as a positive regulator of ethylene- induced senescence. The aim of this study was to address the question of how NO interacts with ethylene to regulate leaf senescence by characterizing the double mutant ein2-1 nosllnoal （Arabidopsis thaliana）. Double mutant analysis revealed that the nosllnoal-mediated, dark-induced early senescence phenotype was suppressed by mutations in EIN2, suggesting that EIN2 is involved in nitric oxide signaling in the regulation of leaf senescence. The results showed that chlorophyll degradation in the double mutant leaves was significantly delayed. In addition, nosllnoal-mediated impairment in photochemical efficiency and integrity of thylakoid membranes was reverted by EIN2 mutations. The rapid upregulation of the known senescence marker genes in the nosl/noal mutant was severely inhibited in the double mutant during leaf senescence. Interestingly, the response of dark-grown nosl/noal mutant seedlings to ethylene was similar to that of wild type seedlings. Taken together, our findings suggest that EIN2 is involved in the regulation of early leaf senescence caused by NO deficiency, but NO deficiency caused by NOSIlNOA1 mutations does not affect ethylene signaling.

关键词： Arabidopsis dark EIN2 leaf senescence nitric oxide.

QCD phase diagram with the improved Polyakov loop effective potential

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Nuclear Science and Techniques 2016年第6期27卷 61-66页

作者： Guo-yun Shao Xue-Yan gao Zhan-Duo Tang Ning gao Department of Applied Physics Xi’an Jiaotong University

We report our recent progress on the QCD phase *** explore the properties of quark–gluon matter in the improved Polyakov–Nambu–Jona–Lasinio(PNJL)model by introducing a chemical potential-dependent Polyakov loop *** treatment effectively reflects the quantum backreaction of matter sector to glue sector at nonzero chemical *** with the original PNJL model,a superiority of the improved PNJL model is that it can effectively describe the confinement–deconfinement transition at low temperature and high *** the QCD phase diagram will be modified to a certain degree if the strength of the quantum backreaction of matter sector to glue sector is *** evident variation is that the region of quarkyonic phase will be greatly reduced in the improved PNJL *** means that the modification to the Polyakov loop potential with the chemical potential dependence is possibly a significant improvement in exploring the full QCD phase structure.

关键词： QCD 相图有效势 NJL模型夸克胶子物质化学势相位结构势模型

Effect of ultrasonic vibration on finished quality in ultrasonic vibration assisted micromilling of Inconel718

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Chinese Journal of Aeronautics 2021年第6期34卷 209-219页

作者： Bin fang Zhonghang YUAN Depeng LI Liying gao School of Mechanical and Automotive Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

Inconel718 was machined with the traditional micromilling(TMM)and ultrasonic vibration assisted micromilling(UVAMM)with the different technology parameters,whose surface quality and burrs formation were *** results show that TMM often forms pits,bumps and gullies in the size effect *** effectively improves the surface quality compared with *** surface defects are significantly reduced with the increase of feed per tooth(fz).When fz exceeds 4 lm,the effect of ultrasonic vibration on the surface quality is no longer *** minimum burr size on the down milling side and the up milling side are 50.23 lm and 36.57 lm,*** feasibility of vibration cutting in improving surface quality and suppressing burr size was *** effectively suppresses the formation of built-up edge,which can significantly improve the micromilling *** cutting force is obtained through simulation and *** are agreement in the change *** finite element simulation can be used to predict the cutting *** with TMM,feeding force(Fx),radial force(Fy)and axial force(Fz)of UVAMM decrease by 7.6%,11.5%and 1.3%,respectively.

关键词： Burr Cutting force Simulation Surface quality Ultrasonic vibration assisted micromilling

Dramatic Impact of Auxiliary Ligands on the Dynamic Magnetic Relaxation in Tetranuclear Dy^(III)_(2)Zn^(II)_(2) Single Molecule Magnets

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Chinese Journal of Chemistry 2022年第20期40卷 2415-2420页

作者： gao-Peng Li Hong-fang Xie Shi-Rui Yang yun-Long Fu Yi-Quan Zhang Yao-Yu Wang Key Laboratory of Magnetic Molecules&Magnetic Information Materials of the Ministry of Education School of Chemistry&Material ScienceShanxi Normal UniversityTaiyuanShanxi030031 China Weinan Bureau of Natural Resources and Planning WeinanShaanxi714000 China Jiangsu Key Laboratory for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjingJiangsu210023 China Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education Shaanxi Key Laboratory of Physico-Inorganic ChemistryCollege of Chemistry and Materials ScienceNorthwest UniversityXi'anShaanxi710127 China

Better understanding the determining factors of dynamic magnetic relaxation in polynuclear lanthanide based single-molecule magnets(SMMs)remains a challenge due to the complexity of such architectures involving interactions between the magnetic *** address this issue,two structurally related heterometal Dy^(III)_(2)Zn^(II)_(2) SMMs,[Zn_(2)Dy_(2)(L)_(4)(Ac)_(2)(DMF)(CH_(3)OH)]·CH_(3)OH·2H_(2)O(1)and[Zn_(2)Dy_(2)(L)_(4)(Ac)_(2)(DMF)_(2)]·4CH_(3)CN(2)(H_(2)L=(E)-2-((2-hydroxy-3-methoxybenzylidene)amino)-4-methyphenol,DMF=N,N-dimethylformamide),are introduced and *** modifying the auxiliary ligands on one Dy^(III) site while retaining that on the other Dy^(III),the intramolecular magnetic interactions and relaxation dynamics in these two heterometallic-Dy^(III)_(2)Zn^(II)_(2) SMMs can be tuned,demonstrating a dramatic change in the magnet relaxation behavior with energy barrier changing from a negligible value for 1 to 305 K for *** initio calculations reveal that changing the coordination geometries on the Dy^(III) sites can significantly affect the magnetic interactions as well as single-ion anisotropy.

关键词： Single-molecule magnets Dynamic magnetic relaxation Dysprosium Auxiliary ligands Ab initio calculations

Simulation-based optimization of inner layout of a theater considering the effect of pedestrians

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Chinese Physics B 2020年第3期29卷 285-291页

作者： Qing-Fei gao Yi-Zhou Tao Yan-fang Wei Cheng Wu Li-yun Dong Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China College of Science Shanghai Institute of TechnologyShanghai 201418China College of Physical Science and Technology Yulin Normal UniversityYulin 537000China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai 200072China

We propose an extended cellular automaton model based on the floor field. The floor field can be changed accordingly in the presence of pedestrians. Furthermore, the effects of pedestrians with different speeds are distinguished, i.e., still pedestrians result in more increment of the floor field than moving ones. The improved floor field reflects impact of pedestrians as movable obstacles on evacuation process. The presented model was calibrated by comparing with previous studies. It is shown that this model provides a better description of crowd evacuation both qualitatively and *** we investigated crowd evacuation from a middle-size theater. Four possible designs of aisles in the theater are studied and one of them is the actual design in reality. Numerical simulation shows that the actual design of the theater is *** we optimize the position of the side exit in order to reduce the evacuation time. It is shown that the utilization of the two exits at bottom is less than that of the side exits. When the position of the side exit is shifted upwards by about 1.6 m,it is found that the evacuation time reaches its minimum.

关键词： cellular automaton floor field crowd evacuation optimization of pedestrian facilities

Improved Subsynchronous Oscillation Parameter Identification with Synchrophasor Based on Matrix Pencil Method in Power Systems

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 22-33页

作者： Xiaoxue Zhang fang Zhang Wenzhong gao Jinghan He the School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China the Department of Electrical and Computer Engineering University of DenverDenverUSA

The subsynchronous oscillations(SSOs)related to renewable generation seriously affect the stability and safety of the power *** realize the dynamic monitoring of SSOs by utilizing the high computational efficiency and noise-resilient features of the matrix pencil method(MPM),this paper propos es an improved MPM-based parameter identification with syn *** MPM is enhanced by the angular frequency fitting equations based on the characteristic polynomial coeffi cients of the matrix pencil to ensure the accuracy of the identi fied parameters,since the existing eigenvalue solution of the MPM ignores the angular frequency conjugation constraints of the two fundamental modes and two oscillation ***,the identification and recovery of bad data are proposed by uti lizing the difference in temporal continuity of the synchropha sors before and after noise *** proposed parameter identification is verified with synthetic,simulated,and actual measured phase measurement unit(PMU)*** with the existing MPM,the improved MPM achieves better accuracy for parameter identification of each component in SSOs,better real-time performance,and significantly reduces the effect of bad data.

关键词： Subsynchronous oscillations(SSOs) synchrophasor parameter identification matrix pencil method bad data

Numerical modeling of mass transfer processes coupling with reaction for the design of the ozone oxidation treatment of wastewater

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Frontiers of Chemical Science and Engineering 2021年第3期15卷 602-614页

作者： Hong Li fang Yi Xingang Li Xin gao School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China National Engineering Research Center of Distillation Technology ollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300072China

A computational model for an ozone oxidation column reactor used in dyeing wastewater treatment is proposed to represent,simulate,and predict the ozone bubble *** the hydrodynamics,mass transfer,and ozone oxidation reaction,coupling modeling can more realistically calculate the ozone oxidation bubble process than the splitting methods proposed in previous *** modeling is validated and shows great consistency with experimental *** verified model is used to analyze the effect of operating conditions,such as the initial gas velocity and the ozone concentration,and structural conditions,such as multiple gas *** ozone consumption is influenced by the gas velocity and the initial ozone *** ozone’s utilization decreases with the increasing gas velocity while nearly the same at different initial ozone *** results can be used in guiding the practical operation of dyeing wastewater treatment and in other ozonation systems with known rate constants in wastewater treatment.

关键词： ozone wastewater treatment numerical simulation mass transfer