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Extreme value theory applied to the auroral electrojet indices

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Earth and Planetary Physics 2024年第2期8卷 375-381页

作者： si Chen Hong Yuan Yong Wei guang Yang FengZheng Yu Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

The study of extreme weather and space events has gained paramount importance in modern society owing to rapid advances in high *** and describing exceptional occurrences plays a crucial role in making decisive assessments of their potential impact on technical,economic,and social aspects in various *** research focuses on analyzing the hourly values of the auroral electrojet(AE)geomagnetic index from 1957 to 2019 by using the peak over threshold method in extreme value *** fitting the generalized Pareto distribution to extreme AE values,shape parameter indices were derived,revealing negative values that establish an upper bound for this time ***,it became evident that the AE values had reached a plateau,suggesting that extreme events exceeding the established upper limit are *** a result,although the need for diligent precautions to mitigate the consequences of such extreme events persists,surpassing the upper limit of AE values becomes increasingly *** is also possible to observe an aurora in the middle-and low-latitude regions during the maximum period of the AE index.

关键词： auroral electrojet indices extreme value theory extreme events

Electroacupuncture treatment improves motor function and neurological outcomes after cerebral ischemia/reperfusion injury

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Neural Regeneration Research 2022年第7期17卷 1545-1555页

作者： si-si Li Xu-Yun Hua Mou-Xiong Zheng Jia-Jia wu Zhen-Zhen Ma Xiang-Xin Xing Jie Ma Chun-Lei Shan Jian-guang Xu School of Rehabilitation Science Shanghai University of Traditional Chinese MedicineShanghaiChina Department of Traumatology and Orthopedics Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghaiChina Center of Rehabilitation Medicine Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghaiChina Engineering Research Center of Traditional Chinese Medicine Intelligent Rehabilitation Ministry of EducationShanghaiChina

Electroacupuncture(EA)has been widely used for functional restoration after ***,its role in post-stroke rehabilitation and the associated regulatory mechanisms remain poorly *** this study,we applied EA to the Zusanli(ST36)and Quchi(LI11)acupoints in rats with middle cerebral artery occlusion and *** found that EA effectively increased the expression of brain-derived neurotrophic factor and its receptor tyrosine kinase B,synapsin-1,postsynaptic dense protein 95,and microtubule-associated protein 2 in the ischemic penumbra of rats with middle cerebral artery occlusion and ***,EA greatly reduced the expression of myelin-related inhibitors Nogo-A and NgR in the ischemic *** kinase B inhibitor ANA-12 weakened the therapeutic effects of *** findings suggest that EA can improve neurological function after middle cerebral artery occlusion and reperfusion,possibly through regulating the activity of the brain-derived neurotrophic factor/tyrosine kinase B signal *** procedures and experiments were approved by the Animal Research Committee of Shanghai University of Traditional Chinese Medicine,China(approval ***200110002)on January 10,2020.

关键词： brain-derived neurotrophic factor dendritic electroacupuncture ischemia/reperfusion motor function neurite outgrowth inhibitor-A neurological outcomes Nogo receptor synapse tyrosine kinase B

Modification of CeO_2-ZrO_2 catalyst by potassium for NOx-assisted soot oxidation

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Journal of Environmental Sciences 2011年第1期23卷 145-150页

作者： DuanWeng Jia Li, Xiaodong wu Zhichun si State Key Laboratory of New Ceramics & Fine Process Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

Potassium-modified ceria-zirconia catalyst was synthesized by wetness impregnation method. The ageing treatment was performed in static air at 800℃ for 20 hr to evaluate the thermal stability of the catalyst. The catalysts were characterized by X-ray diffraction, BET surface area, oxygen storage capacity, NOx-temperature programmed desorption and soot-temperature programmed oxidation measurements. By introduction of potassium, the maximum soot oxidation rate temperature （Tin） of the ceria-zirconia based catalyst decreased from 525 to 428℃ in the presence of NO under a loose contact mode. The shift of Tm of the K-modified catalyst after ageing is only 15℃. The enhanced activity of the aged catalyst mainly lies in the promotional effect of potassium on the NOx/oxygen storage capacity as well as the soot-catalyst contact.

关键词： CeO2-ZrO2 mixed oxides potassium soot combustion NOx storage oxygen storage capacity

Near-infrared light-driven Janus capsule motors： Fabrication, propulsion, and simulation

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Nano Research 2016年第12期9卷 3747-3756页

作者： Yingjie wu Tieyan si Jingxin Shao Zhiguang wu Qiang He Key Laboratory of Microsystems and Microstructures Manufacturing Ministry of Education Micro/Nanotechnology Research CentreHarbin Institute of Technology Yi Kuang Jie 2 Harbin 150080 China

We report a fuel-free, near-infrared （NIR）-driven Janus microcapsule motor. The Janus microcapsule motors were fabricated by template-assisted polyelectrolyte layer-by-layer assembly, followed by spraying of a gold layer on one side. The NIR-powered Janus motors achieved high propulsion with a maximum speed of 42μm.s-1 in water. The propulsion mechanism of the Janus motor was attributed to the self-thermophoresis effect： The asymmetric distribution of the gold layer generated a local thermal gradient, which in turn generated thermophoretic force to propel the Janus motor. Such NIR-propelled Janus capsule motors can move efficiently in cell culture medium and have no obvious effects on the cell at the power of the NIR laser, indicating considerable promise for future biomedical applications.

关键词： layer-by-layer assembly Janus micromotor light-driven active targeting photothermal effect

The Anion Binding Affinity Determines the Strength of Anion Specificities of Thermosensitive Polymers

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Chinese Journal of Polymer Science 2021年第11期39卷 1351-1356页

作者： Lei-Lei Lian si-Yuan Xu Hai-Yang Yuan guang-Ming Liu Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China

In this work,we demonstrate that the strength of anion specificities of thermosensitive polymers is determined by the affinity of direct anion binding to the *** have prepared a series of thermosensitive statistical copolymers with distinct thermoresponsive *** anions can specifically interact with the different types of thermosensitive polymers in very different strengths.A similar strength of specific anion effects on thermoresponsive behaviors can be observed at very different salt concentrations for the different types of thermosensitive polymers.A stronger anion binding to the thermosensitive polymers gives rise to a more obvious anion specificity and vice *** work presented here opens up opportunities for the application of ion binding affinity to modulate the strength of ion specificities of thermosensitive polymers.

关键词： Specific ion effect Polyzwitterion Ion-polymer interaction Thermosensitivity Ion-pairing

Effect of water vapor on NH_3–NO/NO_2 SCR performance of fresh and aged MnO_x–NbO_x–CeO_2 catalysts

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Journal of Environmental Sciences 2015年第5期27卷 240-247页

作者： Lei Chen Zhichun si Xiaodong wu Duan Weng Zhenwei wu State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Graduate School at Shenzhen Tsinghua University

A MnOx-NbOx-CeO2 catalyst for low temperature selective catalytic reduction（SCR） of NOx with NH3 was prepared by a sol-gel method, and characterized by NH3-NO/NO2 SCR catalytic activity, NO/NH3 oxidation activity, NOx/NH3 TPD, XRD, BET, H2-TPR and in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy（DRIFTS）. The results indicate that the Mn Ox-Nb Ox-CeO2 catalyst shows excellent low temperature NH3-SCR activity in the temperature range of 150-300℃. Water vapor inhibits the low temperature activity of the catalyst in standard SCR due to the inhibition of NOx adsorption. As the NO2 content increases in the feed, water vapor does not affect the activity in NO2 SCR. Meanwhile, water vapor significantly enhances the N2 selectivity of the fresh and the aged catalysts due to its inhibition of the decomposition of NH4NO3 into N2O.

关键词： Water effect MnOx-NbOx-CeO2 catalysts Acid sites Fast SCR reaction NO/NO2 ratio

Light-induced stepped thermal relaxation in a Hofmann-type metal-organic framework

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Science China Chemistry 2024年第6期67卷 1983-1989页

作者： Wen Cui Wei-Wei wu Ze-Yu Ruan Yan-Cong Chen guang-Jun Zeng Guan-Xi Chen si-Guo wu Zhao-Ping Ni Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistryInstitute of Green Chemistry and Molecular EngineeringGuangdong Basic Research Center of Excellence for Functional Molecular EngineeringSun Yat-sen UniversityGuangzhou510275China

Spin-crossover(SCO)materials with light-induced multistability have potential applications in multi-addressable opto-magnetic memory devices and multiple ***,we reported a three-dimensional Hofmann-type metal-organic framework(MOF)[Fe(bpy){Pt(CN)_(4)}]·coumarin(1·coumarin,bpy=4,4′-bipyridine),which exhibits an incomplete and hysteretic SCO *** importantly,the light-induced stepped thermal relaxation(LISTR)with obvious magnetic plateau for a hidden intermediate spin state is firstly *** hidden spin state is also observed for the first time in the thermal relaxation after light-assisted spin state annealing(LASSA).Meanwhile,an extremely rare bi-directional light-induced excited spin-state trapping(LIESST)with the highest reverse-LIESST temperature is ***,five spin states can be captured in 1·coumarin and the tristability can be modulated below 102 K through the excitation-relaxation ***,the light-and temperatureinduced multistability provides a new strategy for developing multistable materials.

关键词： light magnetic multistability iron metal-organic framework spin-crossover

Type Ⅰ congenital extrahepatic portosystemic shunt treated by orthotopic liver transplantation: A case report

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World Journal of Clinical Cases 2019年第7期7卷 903-907页

作者： Wen Xiang Hao Wang Zhong-Zhou si guang-Shun Chen Guan-wu Wang Ting Li Organ Transplantation Center The Second Xiang-Ya Hospital Central South University

BACKGROUND Congenital extrahepatic portosystemic shunt, also known as Abernethy deformation, is a rare malformation caused by dysplasia in the portal vein system. There are few reports of liver transplantation as a treatment for Abernethy deformation, and our report is the first case in China. This is the second reported case with congenital extrahepatic portosystemic shunt combined with focal nodular hyperplasia and hepatopulmonary treated with liver *** SUMMARY The patient was a 14-year-old girl, diagnosed preoperatively as type Ib Abernethy deformation, intrahepatic multiple space-occupying lesion, and hepatopulmonary syndrome. The patient recovered well after undergoing classic orthotopic liver transplantation. Liver function, pulmonary function, and portal vein computed tomography angiography imaging were reexamined 20 mo postoperatively, and no abnormality was *** Liver transplantation is an effective treatment for type I Abernethy deformation combined with focal nodular hyperplasia and hepatopulmonary syndrome.

关键词： Congenital extrahepatic portosystemic shunt Abernethy deformation Liver transplantation Case report

Global Smooth Solution to the Incompressible Navier-Stokes-Landau-Lifshitz Equations

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Acta Mathematicae Applicatae sinica 2023年第1期39卷 135-178页

作者： guang-wu WANG You-de WANG School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006China Hua Loo-Keng Key Laboratory of Mathematics Institute of MathematicsAMSS and School of Mathematical ScienceUCASBeijing 100190China

In this paper, we will investigate the incompressible Navier-Stokes-Landau-Lifshitz equations, which is a system of the incompressible Navier-Stokes equations coupled with the Landau-Lifshitz-Gilbert equations. We will prove global existence of the smooth solution to the incompressible Navier-Stokes-Landau-Lifshitz equation with small initial data in T2or R2and R3.

关键词： incompressible Navier-Stokes-Landau-Lifshitz equations global smooth solution small initial data