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Neural Regeneration Research 2015年第4期10卷 576-582页

作者： Yao-xian Xiang Wen-xin Wang Zhe Xue Lei Zhu Sheng-bao Wang zheng-hui sun Department of Neurosurgery Chinese PLA General Hospital Department of Radiology Beijing Electric Power Hospit

Vagus nerve stimulation exerts protective effects against ischemic brain injury; however, the underlying mechanisms remain unclear. In this study, a rat model of focal cerebral ischemia was established using the occlusion method, and the right vagus nerve was given electrical stimula-tion （constant current of 0.5 mA; pulse width, 0.5 ms; frequency, 20 Hz; duration, 30 seconds; every 5 minutes for a total of 60 minutes） 30 minutes, 12 hours, and 1, 2, 3, 7 and 14 days after surgery. Electrical stimulation of the vagus nerve substantially reduced infarct volume, improved neurological function, and decreased the expression levels of tumor necrosis factor-α and in-terleukin-6 in rats with focal cerebral ischemia. The experimental findings indicate that the neuroprotective effect of vagus nerve stimulation following cerebral ischemia may be associated with the inhibition of tumor necrosis factor-α and interleukin-6 expression.

关键词： nerve regeneration vagus nerve stimulation cerebral ischemia inflammatory cytokines infarct volume neurological function NSFC grants neural regeneration

Borohydride Ammoniate Solid Electrolyte Design for All-Solid-State Mg Batteries

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Energy & Environmental Materials 2024年第1期7卷 104-110页

作者： Yuepeng Pang zhengfang Nie Fen Xu Lixian sun Junhe Yang Dalin sun Fang Fang Shiyou zheng School of Materials and Chemistry University of Shanghai for Science and Technology Guangxi Key Laboratory of Information Materials & Guangxi Collaborative Innovation Centre of Structure and Property for New Energy and Materials Guilin University of Electronic Technology Department of Materials Science Fudan University

Searching for novel solid electrolytes is of great importance and challenge for all-solid-state Mg *** this work, we develop an amorphous Mg borohydride ammoniate,Mg（BH4）2·2NH3,as a solid Mg electrolyte that prepar... 详细信息

关键词： all-solid-state Mg batteries amorphization Mg borohydride ammoniate Mg vacancy migration solid electrolyte

Active sub-reflector research for a large radio telescope

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Research in Astronomy and Astrophysics 2020年第1期20卷 69-76页

作者： Jin-Qing Wang Rong-Bin Zhao Yong-Chen Jiang zheng-Xiong sun Lin-Feng Yu Li Fu Qin-Hui Liu Wei-Min zheng Zhi-Qiang Shen Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China Shanghai Key Laboratory of Space Navigation and Positioning Techniques Shanghai 430074China

This paper proposes an active sub-reflector suitable for large radio telescopes,which can compensate both of the deformation of the main reflector and sub-reflector position *** mathematical formula of the main reflector deformation compensated by the sub-reflector is deduced based on Cassegrain and Gregory antenna *** position of the sub-reflector is adjustable to compensate for defocusing errors on high and low elevations,which are mainly caused by the deformation of the sub-reflector supporting *** this paper,the method of obtaining the optimum position of the sub-reflector from the aperture phase by the interferometric method is *** actual measurement is verified on the Tianma 65 m radio telescope,which provides a new way to diagnose the position error of the sub-reflector.

关键词： radio telescope deformable sub-reflector model holography phase

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定量光声层析成像的研究进展

发光学报 2017年第9期38卷 1222-1232页

作者：孙正郑兰华北电力大学电子与通信工程系河北保定071003

光声层析(Photoacoustic tomography,PAT)成像结合了超声成像的高分辨率和光学成像的高对比度的优势,是一种新型的生物医学成像模式。PAT成像算法包含两个逆问题,即根据组织产生的光声信号构建初始声压分布图(即图像重建)以及在此基础... 详细信息

光声层析(Photoacoustic tomography,PAT)成像结合了超声成像的高分辨率和光学成像的高对比度的优势,是一种新型的生物医学成像模式。PAT成像算法包含两个逆问题,即根据组织产生的光声信号构建初始声压分布图(即图像重建)以及在此基础上估算成像区域的光学特性参数。后者是一个非线性的不适定问题,通常称为定量光声层析(Quantitative photo-acoustic tomography,q PAT)成像。本文在介绍光声成像原理的基础上,对主要的q PAT算法进行综述,讨论各自的优势和不足,并对未来可能的发展方向进行展望。

关键词：定量光声成像图像重建逆问题光吸收系数散射系数 Gruneisen系数

Photocatalytic CO2 reduction highly enhanced by oxygen vacancies on Pt-nanoparticle-dispersed gallium oxide

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Nano Research 2016年第6期9卷 1689-1700页

作者： Yun-Xiang Pan zheng-Qing sun Huai-Ping Cong Yu-Long Men Sen Xin Jie Song Shu-Hong Yu School of Chemistry and Chemical Engineering Hefei University of Technology Hefei 230009 China Division ofNanomaterials & Chemistry Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemistry CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei 230026 China Institute of Nano Biomedicine and Engineering Department of Instrument Science and Engineering School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

Photocatalytic CO2 reduction on metal-oxide-based catalysts is promising for solving the energy and environmental crises faced by mankind. The oxygen vacancy （Vo） on metal oxides is expected to be a key factor affecting the efficiency of photocatalytic CO2 reduction on metal-oxide-based catalysts. Yet, to date, the question of how an Vo influences photocatalytic CO2 reduction is still unanswered. Herein, we report that, on Vo-rich gallium oxide coated with Pt nanoparticles （Vo-rich Pt/Ga203）, CO2 is photocatalytically reduced to CO, with a highly enhanced CO evolution rate （21.0umol.h-1） compared to those on Vo-poor Pt/Ga2O3 （3.9 gmol-h-1） and Pt/TiO2（P25）（6.7 gmol.h-1）. We demonstrate that the Vo leads to improved CO2 adsorption and separation of the photoinduced charges on Pt/Ga203, thus enhancing the photocatalytic activity of Pt/Ga203. Rational fabrication of an Vo is thereby an attractive strategy for developing efficient catalysts for photocatalytic CO2 reduction.

关键词： photocatalytic CO2reduction oxygen vacancy metal-oxide-based catalyst C02 adsorption

A novel 58-nuclei silver nanowheel encapsulating a subvalent Ag64+ kernel

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Science China Chemistry 2020年第1期63卷 16-20页

作者： Zhi Wang Qing-Ping Qu Hai-Feng Su Peng Huang Rakesh Kumar Gupta Qing-Yun Liu Chen-Ho Tung Di sun Lan-sun zheng Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials Department of ChemistrySchool of Chemistry and Chemical EngineeringJiangsu Normal UniversityXuzhou 221116China State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China

The combination of CrO4^2-anion and N,N′-dimethylformamide(DMF)-containing solvent helps to stabilize an atom-precise ultrasmall Ag6 kernel into a 52-nuclei silver shell,giving a core-shell Ag6@Ag52 wheel-like struct... 详细信息

关键词： silver cluster subvalent Ag6^4+kernel electrospray ionisation mass spectrometry(ESI-MS) photocurrent response

Anionic passivation layer-assisted trapping of an icosahedral Ag_(13)kernel in a truncated tetrahedral Ag_(89)nanocluster

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Science China Chemistry 2021年第9期64卷 1482-1486页

作者： Yan-Min Su Bao-Qian Ji Zhi Wang Shan-Shan Zhang Lei Feng Zhi-Yong Gao Yun-Wu Li Chen-Ho Tung Di sun Lan-sun zheng Key Lab of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan250100China School of Chemistry and Chemical Engineering Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsKey Laboratory of Green Chemical Media and ReactionsMinistry of EducationHenan Normal UniversityXinxiang453007China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng252000China State Key Laboratory for Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China

Isolating reductive silver kernel from shell is a challenging task but is quite important to understand the embryonic form during the formation of silver *** intercalation of suitable anionic species may be of benefit for passivating then capturing such highly active ***,we successfully isolated a novel silver thiolate nanocluster[Ag_(13)@Ag_(76)S_(16)(Cyh S)_(42)(p-NH_(2)-Ph As O_(3))_(4)]^(3+)(SD/Ag89 a,Cyh SH=cyclohexanethiol)that contains a well-isolated icosahedral Ag_(13) kernel passivated by four Ag S_(4)^(7-) tetrahedra and four p-NH_(2) Ph As O_(3)^(2-) piercing from outer Ag_(72) *** note,this Ag_(13) kernel is the largest isolable subvalent silver kernel beneath the silver shell with extremely legible core-shell boundary ever before and represents a precise embryonic model formed in the reducing Ag(I)to Ag(0)followed by aggregating to large silver *** reductive role of DMF and the introduction of anionic passivation layer(APL)synergistically modulate the reduction kinetics,facilitating the capture of ultrasmall subvalent silver ***/Ag89 a emits in near infrared(NIR)region(λ_(em)=800 nm)at low *** synthetic strategy shown in this work opens up new opportunities for precisely capturing and recognizing diverse reductive silver kernels in different systems.

关键词： silver cluster anionic passivation layer X-ray structure luminescence

Fixed-Time Outer Synchronization of Complex Networks with Noise Coupling

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Communications in Theoretical Physics 2018年第3期69卷 271-279页

作者： Hong-Jun Shi Lian-Ying Miao Yong-zheng sun Mao-Xing Liu School of Mathematics China University of Mining and TechnologyXuzhou 221008China School of Science North University of ChinaTaiyuan 030051China

In this paper,the fixed-time outer synchronization of complex networks with noise coupling is *** on the theory of fixed-time stability and matrix inequalities,sufficient conditions for fixed-time outer synchronization are established and the estimation of the upper bound of the setting time is *** result shows that the setting time can be adjusted to a desired value regardless of the initial *** simulations are performed to verify the effectiveness of the theoretical *** effects of control parameters and the density of controlled nodes on the converging time are studied.

关键词： outer synchronization fixed-time complex network noise coupling

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应变软化对土坡稳定性影响的数值模拟

江西冶金 2024年第3期44卷 211-218页

作者：何静怡孙政岳臣龙刘开周晓敏江西理工大学土木与测绘工程学院赣州341000

土质边坡在降雨、自重等因素的共同作用下表现出应变软化特性,对土质边坡的长期稳定性具有一定影响。本研究利用有限元软件ABAQUS建立二维土质边坡模型,在应变软化本构过程中只改变应变软化参数,开展了边坡的渐进破坏过程的数值模拟。... 详细信息

土质边坡在降雨、自重等因素的共同作用下表现出应变软化特性,对土质边坡的长期稳定性具有一定影响。本研究利用有限元软件ABAQUS建立二维土质边坡模型,在应变软化本构过程中只改变应变软化参数,开展了边坡的渐进破坏过程的数值模拟。结果表明,坡脚处首先出现软化破坏,并伴随着塑性剪切破坏,破坏过程由坡脚向坡顶逐渐发展,直至土坡完全失稳。应变软化参数对土坡稳定性产生显著影响,随着网格尺寸、峰值塑性应变、残余内摩擦角及残余黏聚力的减小,土坡的动能、总应变能及位移总体上呈增大的趋势。本方法简单可靠,效率较高,能够较好地模拟土质边坡应变软化特性,切合工程实际。

关键词：数值模拟应变软化渐进破坏土坡稳定性

Fabrication and properties of silver-based composites reinforced with carbon-coated Ti_(3)AlC_(2)

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1836-1843页

作者： Yong-fa Zhu Wu-bian Tian Dan-dan Wang Heng Zhang Jian-xiang Ding Pei-gen Zhang zheng-ming sun Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Key Laboratory of Metallurgical Emission Reduction&Resources Recycling Ministry of EducationSchool of Materials Science and EngineeringAnhui University of TechnologyMa’anshan 243002China

Ti_(3)AlC_(2)-reinforced Ag-based composites,which are used as sliding current collectors,electrical contacts,and electrode materials,exhibit remarkable ***,the interfacial reactions between Ag and Ti_(3)AlC_(2) significantly degrade the electrical and thermal properties of these *** diminish these interfacial reactions,we fabricated carbon-coated Ti_(3)AlC_(2) particles(C@Ti_(3)AlC_(2))as reinforcement and prepared Ag–10wt%C@Ti_(3)AlC_(2) composites with carbon-layer thicknesses ranging from 50–200 *** with the uncoated Ag–Ti_(3)AlC_(2) composite,Ag–C@Ti_(3)AlC_(2) was found to have a better distribution of Ti_(3)AlC_(2) *** increases in the carbon-layer thickness,the Vickers hardness value and relative density of Ag–C@Ti_(3)AlC_(2) gradually *** a carbon-layer thickness of 150 nm,we obtained the lowest resistivity of Ag–C@Ti_(3)AlC_(2) of 29.4135.5×10^(−9)Ω·m,which is half that of Ag–Ti_(3)AlC_(2)(66.7×10^(−9)Ω·m).The thermal conductivity of Ag–C@Ti_(3)AlC_(2) reached a maximum value of 135.5 W·m^(−1)·K^(−1) with a 200-nm carbon coating(~1.8 times that of Ag–Ti_(3)AlC_(2)).These results indicate that the carbon-coating method is a feasible strategy for improving the performance of Ag–C@Ti_(3)AlC_(2) composites.

关键词： silver-based composite titanium aluminum carbide carbon coating interfacial reaction properties