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Formation of Endohedral Complexes in Collisions of H_(2 ) and D_(2) with C_(60)

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Chinese Physics Letters 1996年第7期13卷 527-530页

作者： XING yue-lin xia yue-yuan MEI Liang-mo Department of Physics Shandong UniversityJinan 250100

Formations of endohedral complexes in collisions of H_(2) and D_(2) with C_(60) molecules have been studied using a molecular dynamics simulation method.H@C_(60) complex is produced when a H_(2) molecule collides with a C_(60) molecule dong the direction from the center of a hexagonal ring into the center of the C_(60) at collision energy E0=40 *** the same collision condition,a D2 molecule colliding with a C_(60) molecule forms a D_(2)@C_(60) complex。

关键词： method collision hexagonal

Tunable Adsorption and Desorption of Hydrogen Atoms on Single-Walled Carbon Nanotubes

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Chinese Physics Letters 2002年第10期19卷 1498-1500页

作者： Zhao Ming-Wen xia yue-yuan Ma Yu-Chen Ying Min-Ju Liu xiang-Dong Mei Liang-Mo Department of Physics Shandong University Ji'nan 250100 Department of Optoelectronics Shandong University Ji'nan 250100

Chemical adsorption and desorption of hydrogen atoms on single-walled carbon nanotubes (SWNTs) are investigated by using molecular dynamics simulations. It is found that the adsorption and desorption energy of hydrogen atoms depend on the hydrogen coverage and the diameter of the SWNTs. Hydrogen-adsorption geometry at the coverage of 1.0 is more energetically stable. The adsorption energy decreases with the increasing diameter of the armchair tubes. The adsorption and desorption energy of hydrogen atoms can be modified reversibly by externally radial deformation. The averaged C-H bond energy on the high curvature sites of the deformed tube increases with increasing radial deformation, while that on the low curvature sites decreases.

关键词： Molecular dynamics

Collision Direction Dependence of React ion Channels and Reaction Products in Molecular Collisions Between Two C_(60) Molecules

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Chinese Physics Letters 1997年第12期14卷 893-896页

作者： ZHANG Zhao-lin LIANG Qi-min MU Yu-guang xia yue-yuan Department of Physics Shandong UniversityJi’nan 250100

The reaction channels and the reaction products in the collisional reactions between two C60 molecules are found to be sensitively dependent on the relative orientation between the colliding *** detailed collision processes and the stable structures of the products are studied by using a molecular dynamics simulation method combined with a Langevin molecular dynamics *** defects of the reaction products are also analyzed.

关键词： scheme C60 collision

Lattice Strain Induced by Ion Implantation in AlGaAs/AlGaInAs Quantum Well Samples

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Chinese Physics Letters 2002年第4期19卷 599-601页

作者： Liu Pi-Jun xia yue-yuan Liu xiang-Dong yuan Feng-Po Pan Jiao-Qing Xue Cheng-Shan Li Yu-Guo Zhao Ming-Wen Ma Yu-Chen Department of Physics Shandong University Ji'nan 250100 Hebei Semiconductor Research Institute Shijiazhuang 050002 Institute of Crystal Materials Shandong University Ji'nan 250100 Institute of Semiconductor Shandong Normal University Ji'nan 250100

Si+ ions of 350keV have been implanted into AlGaAs/AlGaInAs quantum well samples in the dose range from 5×1013cm-2to 5×1014cm-2. The Raman spectra and high resolution x-ray diffraction (HRXRD) were measured from these implanted samples as well as the non-implanted sample. In the implanted layers the average strain which was evaluated by HRXRD increases with the implantation doses and varies from 0.0011 to 0.0029. The quantum well interface intermixing effect and compositional modification are also observed from HRXRD. At the higher doses, an abnormal annealing procedure takes place and it partly removes damage, but the strain remains almost unchanged in the epilayers.

关键词： Aluminum gallium arsenide

Influence of Temperature and Species in the Feedstock on the Growth of Single-Wall Carbon Nanotubes

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Chinese Physics Letters 2001年第1期18卷 82-84页

作者： ZHAO Ming-Wen xia yue-yuan MA Yu-Chen LI Su-Yan WANG Rui-Jin ZHANG Hua-Dong MEI Liang-Mo Department of Optoelectronics and Information Engineering Shandong UniversityJi’nan 250100 Department of Physics Shandong UniversityJi’nan 250100

A molecular dynamics simulation method is used to study the growth of narrow single-wall carbon *** is found that the growth temperature and the species of small carbon clusters in the feedstock are important for the quality of the nanotubes *** is a temperature range of 1000-1500 K in which the narrow armchair single-wall carbon nanotubes can grow rapidly via adduction of C2 dimers,even without the existence of *** narrow zigzag tubes cannot keep open-ended *** the feedstock consists of various species of carbon clusters,the tubes cannot keep open-ended *** higher temperatures,the narrow nanotubes close rapidly in the noncatalytic environment,and the products grown are fullerene-like capsules.

关键词： narrow carbon zigzag

Proton Transmitting Energy Spectra and Transmission Electron Microscope Examinations of Biological Samples

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Chinese Physics Letters 1999年第2期16卷 123-125页

作者： TAN Chun-yu xia yue-yuan ZHANG Jian-hua MU Yu-guang WANG Rui-jin LIU Ji-tian LIU xiang-dong YU Zeng-liang Department of Physics Shandong UniversityJi’nan 250100 Department of Photoelectronics Shandong UniversityJi’nan 250100 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031

Transmission energy spectra of 530 keV H^(+) ion penetrating 140μm thick seed coat of maize and fruit peel of grape with thickness of 100μm were *** result indicates that these thick biological targets,as seen by the penetrating ions,are inhomogeneous,and there are open“channel like”paths along which the incidentions can transmit the targets *** most of the incident ions are stopped in the targets,some of the transmitting ions only lose a small fraction of their initial incident *** transmission energy spectra show a pure electronic stopping *** electron microscope(TEM)micrographes taken from the samples of seed coat of maize and fruit peel of tomato with thickness of 60μm indicate that 150keV electron beam from the TEM can penetrate the thick samples to give very good images with clear contrasts.

关键词： incident Electron inhomogeneous

Deep Penetration of Charged Particles in Biological Samples

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Chinese Physics Letters 2001年第2期18卷 208-210页

作者： WANG Rui-Jin xia yue-yuan MU Yu-Guang ZHAO Ming-Wen MA Yu-Chen LIU xiang-Dong ZHANG Jian-HuaLIU Ji-Tian YU Zeng-Liang Department of Optoelectronics and Information Engineering Shandong UniversityJi’nan 250100 Department of Physics Shandong UniversityJi’nan 250100 Institute of Plasma Physics Chinese Academy of SciencesHefei ***

Experimental evidence of abnormally deep penetration in some botanical targets by low-energy ion beams is *** energy spectra of 818 keV He^(+)ions penetrating a 70μm thick seed coat of maize,fruit peel of grape and of tomato all have a common *** leading edges of these broad spectra indicate that some of the penetrating ions pass through the thick targets easily and only lose a small fraction of their initial incident *** backscattering spectrometry and electron microprobe measurements are used to determine the argon concentration in multilayer samples of the seed coat of maize implanted by 200 keV Ar^(+)*** results show that about 10%of the Ar^(+)ions can penetrate deeper than~100μm in these samples.

关键词： microprobe multilayer incident

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铯在铝中扩散的研究

山东大学学报(自然科学版) 1980年第4期 51-63页

作者：夏曰源山东大学物理系

详细地研究了铯在铝中的扩散和释放过程。铝衬底中的铯是由离子注入引入的。采用2MeV4He+离子的卢瑟福背散射技术测量铝衬底中铯浓度的深度分布。通过分析恒时退火过程中铯在铝中的迁移和从表面释放的资料,得到了铯在铝中的扩散系数。... 详细信息

详细地研究了铯在铝中的扩散和释放过程。铝衬底中的铯是由离子注入引入的。采用2MeV4He+离子的卢瑟福背散射技术测量铝衬底中铯浓度的深度分布。通过分析恒时退火过程中铯在铝中的迁移和从表面释放的资料,得到了铯在铝中的扩散系数。实验表明,铯在单晶和多晶铝中有十分类似的扩散行为。铯离子注入剂量Nd（?）6×1016ionscm-2的情况下,铯在铝中的扩散系数随温度的变化可表示为D（?）0.02exp（-46000/RT）cm2·sec-1.而在剂量较底的情况下(Nd（?）1016ions cm-2),可表示为D（?）0.02exp（-44000/RT）cm2·sec.-1。实验证实了永久性的强陷阱中心的存在。

关键词：单晶铝背散射离子注入深度分辨率退火过程掠角离子掺杂铝衬底

Inhibition of the cGAS–STING pathway:contributing to the treatment of cerebral ischemia-reperfusion injury

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Neural Regeneration Research 2025年第7期20卷 1900-1918页

作者： Hang Yang Yulei xia yue Ma Mingtong Gao Shuai Hou Shanshan Xu Yanqiang Wang School of Clinical Medicine Shandong Second Medical UniversityWeifangShandong ProvinceChina Department of Emergency The Affiliated Hospital of Weifang Medical UniversityWeifangShandong ProvinceChina Department of Neurology Ⅱ The Affiliated Hospital of Weifang Medical UniversityWeifangShandong ProvinceChina

The cGAS–STING pathway plays an important role in ischemia-reperfusion injury in the heart,liver,brain,and kidney,but its role and mechanisms in cerebral ischemia-reperfusion injury have not been systematically ***,we outline the components of the cGAS–STING pathway and then analyze its role in autophagy,ferroptosis,cellular pyroptosis,disequilibrium of calcium homeostasis,inflammatory responses,disruption of the blood–brain barrier,microglia transformation,and complement system activation following cerebral ischemia-reperfusion *** further analyze the value of cGAS–STING pathway inhibitors in the treatment of cerebral ischemia-reperfusion injury and conclude that the pathway can regulate cerebral ischemia-reperfusion injury through multiple *** of the cGAS–STING pathway may be helpful in the treatment of cerebral ischemia-reperfusion injury.

关键词： calcium homeostasis cellular autophagy cerebral ischemia-reperfusion injury cGAS–STING pathway ferroptosis gut–brain–microbiota axis inflammatory light chain 3 microglial cells Syntaxin-17 protein