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EFFECTS OF TREATMENT TEMPERATURE ON THE MICROSTRUCTURE AND MAGNETIC PROPERTIES OF Fe-N THIN FILMS

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Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 293-300页

作者： B.L. li H.M. Du X.F. Wang E.Y. Jiang z.q.li P. Wu Department of Applied Physics Institute of Advanced Materials Physics School of Science Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Tianjin University Tianjin 300072 China

Fe-N thin films were fabricated on both 100Si and NaCl substrates by RF magnetron sputtering under low nitrogen partial pressure. The microstructure and magnetic properties of Fe-N thin films were investigated with the increase of the substrate temperature （Ts） and the annealing temperature （Ta）. It is more difficult for nitrogen atoms to enter the Fe lattice under higher Ts above 150℃. The phase evolution is visible at higher Ta above 200℃. The phase transformation of α＇＇-Fe16N2 occurred at 400℃. The change of crystal size with Ta was clearly visible from bright and dark field images. The clear high-resolution electron microscope （HREM） images of 110α, 111γ＇, 112α＇＇, and 200α＇＇ phases were observed. The interplanar distances from TEM （transmission electron microscope） and HREM match the calculated values very well. From the results of the vibrating sample magnetometer （VSM）, the good magnetic properties of Fe-N films were obtained at 150℃ of Ts and 200℃ of Ta, respectively.

关键词： Fe-N thin film magnetic property HREM α''-Fe16N2

FABRICATION AND PROPERTIES OF CERAMIC -CEMENTED CARBIDE COMPACT INSERTS

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Acta Metallurgica Sinica(English Letters) 1999年第5期12卷 1142-1146页

作者： J.q.zhou,X.Ai,z.q.li and C.z.Huang Institute of Mechanical Engineering, Shandong University of Technology, Jinan 250061, China

A novel ceramic cemented carbide compact insert was developed using hot pressing sintering technique. The surface layers of the sandwich material were ceramic and the middle layer was cemented carbide. The factors that affect the properties of the compact insert were analyzed. Theoretical analyses and experiments indicated that the cemented carbide with greater elastic module and thermal expansion coefficient than ceramic should be used in the sandwich material in order to get high equivalent flexure strength and the geometric parameters of the compact insert are also important to its properties.

关键词： compact insert hot pressing sintering ceramic cemented carbide

Reactivation of an overlooked landslide in site of power plant of Shawan hydropower station,Sichuan,China

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Reactivation of an overlooked landslide in site of power pla...

中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： S.W.qi F.Wu Y.Song z.q.li Engineering Geomechanics Lab Institute of Geology and GeophysicsChinese Academy of Sciences

The power plant of planning construction Shawan hydropower station was planned in the toe area of the right bank *** scale cracks with maximum length over 20 m and downward displacement over 1.0 m occurred in the quaternary accumulation of the middle part of the slope during excavating site for the power plant,and as a result the excavation has to be stopped.A monitor net was placed on the slope and the monitor result indicated that a slide mass has been *** with topography analysis,geological investigation i.e.,borehole exploration,geophysical investigation,it can be concluded that the slope where the power plant located is an overlooked giant ancient landslide during pre-stage investigation for site of hydropower plant,and the landslide is partially *** results indicated that the deformation of the slide is not even,the displacement of the head area is mainly vertical component,and the displacement of the toe area is mainly horizontal *** slide was induced by lots of drainage from No.2 access tunnel,the successive rainfall would accelerate the deformation, and the excavation of new provincial highway in toe area had a crucial effect on local deformation. The slide mass had experienced rainstorm seasons and it did not present severe deformation,thus the slide mass could be stable if drainage system including surface and underground is *** risk of blocking up Muli River is *** conclusions presented above have been verified in practice.

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固态vander WaalsC _(60)膜晶格的Coulomb膨胀

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中国科学（A辑） 2000年第6期30卷 529-536页

作者：薛其坤厉建龙孙牧陆华 T.Hashizume Y.ling Y.Hasegawa K.Ohno z.q.li Y.Kawazoe T.Sakurai H.Kamiyama H.Shinohara 中国科学院表面物理国家重点实验室 Institute for Materials Research Aomori Public College Chemistry Department

利用扫描隧道显微镜观测到生长在GaAs(0 0 1 ) 2× 4表面上的固态vanderWaalsC6 0 膜在室温下较之C6 0 晶体具有 1 3%的晶格膨胀 .这种膨胀是由从GaAs衬底饱和的As悬挂键上转移到C6 0 分子上的电荷之间的Coulomb作用引起的 .理论计算表... 详细信息

利用扫描隧道显微镜观测到生长在GaAs(0 0 1 ) 2× 4表面上的固态vanderWaalsC6 0 膜在室温下较之C6 0 晶体具有 1 3%的晶格膨胀 .这种膨胀是由从GaAs衬底饱和的As悬挂键上转移到C6 0 分子上的电荷之间的Coulomb作用引起的 .理论计算表明 ,平均约有 1 76个电子转移到每个C6 0 分子上 .有趣的是 ,该固态C6 0 膜为 (1 1 0 )取向 ,这明显不同于生长于其他半导体或金属表面上的具有 (1 1 1 )取向的六角密排C6 0 膜 .这种反常取向的薄膜是由GaAs衬底的各向异性产生的一维限制作用导致的 .通过选择不同的衬底 ,可以控制C6 0

关键词：晶体生长分子束外延碳60膜晶格 Coulomb膨胀

Chinese solid ITER TBM and Related Technologies

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Chinese solid ITER TBM and Related Technologies

第十三届全国核物理大会暨第八届会员代表大会

作者： K.M.Feng C.H.Pan G.S.zhang X.Y.Wang T.Yuan z.Chen G.Hu z.zhao z.q.li C.M.Gao H.B.liu G.Y.zheng Southwestern Institute of Physics,RO.Box 432,Chengdu 610041,RR.China

ITER will play a very important role in first integrated blanket testing in fusion *** DEMO blanket relevant technologies,such as tritium self-sufficiency, extraction of high-grade heat,design criteria,safety requirem...

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La2-xBaxCuO4单晶反常的正常态输运性质研究

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低温物理学报 2001年第2期23卷 108-114页

作者：李鹏程杨宏顺李志权柴一晟余日文章良周玉琴陈兆甲曹烈兆中国科学技术大学物理系结构分析中心!合肥230026

测量了La2 -xBaxCuO4 系列单晶样品的电阻率和热电势 ,我们发现 ,当x =0 .12 5(x =1/ 8)时 ,La2 -xBaxCuO4 的载流子是所有样品中局域化最强的 ,但数据分析结果显示 ,它又是弱局域化行为 .文中我们讨论了Tc 的被压制的原因 ,得出这可能... 详细信息

测量了La2 -xBaxCuO4 系列单晶样品的电阻率和热电势 ,我们发现 ,当x =0 .12 5(x =1/ 8)时 ,La2 -xBaxCuO4 的载流子是所有样品中局域化最强的 ,但数据分析结果显示 ,它又是弱局域化行为 .文中我们讨论了Tc 的被压制的原因 ,得出这可能与低温下LTO到LTT的结构相变 ,空穴与自旋的静态条纹有序有关 .热电势结果观察不到任何声子曳引的痕迹 ,表明在LBCO体系中电声子的相互作用很弱 .

关键词：局域化自旋粒子性质 x)BaxCuO4 热电势结构相变电阻系数电阻率晶形单晶输运性质电子-声子相互作用声子曳引正常态载流子(半导体) 空穴反常现象载流子 La

Targeting epigenetic mechanisms in amyloid-β-mediated Alzheimer’s pathophysiology:unveiling therapeutic potential

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Neural Regeneration Research 2025年第1期20卷 54-66页

作者： Jennie z.li Nagendran Ramalingam Shaomin li Ann Romney Center for Neurologic Diseases Brigham and Women’s Hospital and Harvard Medical SchoolBostonMAUSA

Alzheimer’s disease is a prominent chronic neurodegenerative condition characterized by a gradual decline in memory leading to *** evidence suggests that Alzheimer’s disease is associated with accumulating various amyloid-βoligomers in the brain,influenced by complex genetic and environmental *** memory and cognitive deficits observed during the prodromal and mild cognitive impairment phases of Alzheimer’s disease are believed to primarily result from synaptic *** life,environmental factors can lead to enduring changes in gene expression and the emergence of brain *** changes,known as epigenetic modifications,also play a crucial role in regulating the formation of synapses and their adaptability in response to neuronal *** this context,we highlight recent advances in understanding the roles played by key components of the epigenetic machinery,specifically DNA methylation,histone modification,and microRNAs,in the development of Alzheimer’s disease,synaptic function,and activity-dependent synaptic ***,we explore various strategies,including enriched environments,exposure to non-invasive brain stimulation,and the use of pharmacological agents,aimed at improving synaptic function and enhancing long-term potentiation,a process integral to epigenetic ***,we deliberate on the development of effective epigenetic agents and safe therapeutic approaches for managing Alzheimer’s *** suggest that addressing Alzheimer’s disease may require distinct tailored epigenetic drugs targeting different disease stages or pathways rather than relying on a single drug.

关键词： Alzheimer’s disease DNA methylation enriched environments histone modification microRNAs non-invasive brain stimulation synaptic plasticity

Estimation of the Active Earth Pressure with Inclined Cohesive Backfills:the Effect of Intermediate Principal Stress is Considered

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Estimation of the Active Earth Pressure with Inclined Cohesi...

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： W.L.Yu~(1,2,*),J.zhang~1,R.L.Hu~1,z.q.li~1,X.H.Sun~2 and T.L.li~3 1 Key Laboratory of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China 2 Exploration and Development Research Institute,Daqing Oil Field Company Ltd.,Daqing,Heilongjiang 163712,China 3 China Building Technique Group Co.,Ltd,Beijing 100029,China

Estimating active earth pressure accurately is very important when designing retaining *** on the unified strength theory and plane strain assumption,an analytical solution has been developed to determine the active lateral earth pressure distribution on a retaining structure with the inclined cohesive backfill considering the effect of the intermediate principal *** solution derived encompasses both Bell’s equation(for cohesive or cohesionless backfill with a horizontal ground surface) and Rankine’s solution(for cohesionless backfill with an inclined ground surface).

关键词： Active earth pressure inclined cohesive backfill intermediate principal stress Rankine’s theory Bell’s equation

Estimation of the Passive Earth Pressure with Inclined Cohesive Backfills:the Effect of Intermediate Principal Stress is Considered

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Estimation of the Passive Earth Pressure with Inclined Cohes...

中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： W.L.Yu~(*,1,2),J.zhang~1,R.L.Hu~1,z.q.li~1,X.H.Sun~2,R.X.Wang~3 and Y.q.Wang~4 1 Key Laboratory of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China 2 Exploration and Development Research Institute,Daqing Oil Field Company Ltd.,Daqing,Heilongjiang 163712, China 3 Beijing Orangelamp Navigation Technology Development Co.,Ltd,Beijing 10085,China 4 Henan Provincial Communications Planning Survey and Design Institute Co.,Ltd.zhenzhou 450052,China

Estimating passive earth pressure accurately is very important when designing retaining *** on the unified strength theory and plane strain assumption,an analytical solution has been developed to determine the passive lateral earth pressure distribution on a retaining structure when the backfill is cohesive and inclined considering the effect of the intermediate principal *** solution derived encompasses both Bell’s equation(for cohesive or cohesionless backfill with a horizontal ground surface) and Rankine’s solution(for cohesionless backfill with an inclined ground surface).

关键词： Passive earth pressure inclined backfill unified strength theory intermediate principal stress