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Multiple Uplift and Exhumation of the Southeastern Tibetan Plateau:Evidence from Low-Temperature Thermochronology

Acta Geologica Sinica(English Edition) 2024年第3期98卷 569-584页

作者： WU Limin PENG Touping FAN Weiming ZHAO Guochun gao jianfeng DONG Xiaohan PENG Shili MIN Kang Tin Aung MYINT State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Chinese Academy of Sciences Center for Excellence in Deep Earth Science Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China Department of Earth Sciences The University of Hong KongHong Kong 999077China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiGuangdong 519085China Department of Geology University of MandalayMandalay 05011Myanmar

Since the Cenozoic,the Tibetan Plateau has experienced large-scale uplift and outgrowth due to the India-Asia ***,the mechanism and timing of these tectonic processes still remain ***,using apatite fission track dating and inverse thermal modeling,we explore the mechanism of different phases of rapid cooling for different batholiths and intrusions in the southeastern Tibetan *** contrast to previous views,we find that the coeval granitic batholith exposed in the same tectonic zone experienced differential fast uplift in different sites,indicating that the present Tibetan Plateau was the result of differential uplift rather than the entire lithosphere uplift related to lithospheric collapse during Cenozoic *** addition,we also suggest that the 5-2 Ma mantle-related magmatism should be regarded as the critical trigger for the widely coeval cooling event in the southeastern Tibetan Plateau,because it led to the increase in atmospheric CO_(2)level and a hotter upper crust than before,which are efficient for suddenly fast rock weathering and ***,we propose that the current landform of the southeastern Tibetan Plateau was the combined influences of tectonic and climate.

关键词： apatite fission track rapid cooling differential uplift magmatism southeastern Tibetan Plateau

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塑料类汽车零部件仿真模拟技术研究进展

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工程塑料应用 2024年第6期52卷 182-186,192页

作者：高健峰上海亚大汽车塑料制品有限公司上海201708

从选材与结构优化、成型工艺优化和性能测试仿真方面,综述了近几年国内在塑料类汽车零部件仿真模拟技术方面的研究进展情况。其中,在成型工艺优化方面,重点总结了BP神经网络、灰色关联等算法在注射成型工艺优化方面的应用情况,同时也介... 详细信息

从选材与结构优化、成型工艺优化和性能测试仿真方面,综述了近几年国内在塑料类汽车零部件仿真模拟技术方面的研究进展情况。其中,在成型工艺优化方面,重点总结了BP神经网络、灰色关联等算法在注射成型工艺优化方面的应用情况,同时也介绍了多种算法联合仿真的研究进展情况。最后对应用于塑料类汽车零部件的仿真模拟技术发展方向进行了展望。

关键词：汽车零部件塑料模拟仿真成型工艺优化

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电针干预阿尔茨海默病模型小鼠海马神经元和少突胶质细胞的增殖分化

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中国组织工程研究 2024年第7期28卷 1029-1035页

作者：李龙洋张松江赵献敏周春光高剑峰河南中医药大学医学院河南省郑州市450046

背景:电针对阿尔茨海默病模型小鼠海马少突胶质细胞增殖分化的影响尚不清楚,而与少突胶质细胞有关的脱髓鞘反应却是阿尔茨海默病的常见病理反应。目的:探讨电针刺激阿尔茨海默病模型小鼠“百会”“风府”和双侧“肾俞”对内源性神经干... 详细信息

背景:电针对阿尔茨海默病模型小鼠海马少突胶质细胞增殖分化的影响尚不清楚,而与少突胶质细胞有关的脱髓鞘反应却是阿尔茨海默病的常见病理反应。目的:探讨电针刺激阿尔茨海默病模型小鼠“百会”“风府”和双侧“肾俞”对内源性神经干细胞向神经元和少突胶质细胞增殖分化的影响及机制。方法:将6周龄清洁级APP/PS1转基因雄性阿尔茨海默病模型小鼠40只随机分为电针穴位组(n=20)和阿尔茨海默病模型组(n=20),另以同鼠龄的健康C57BL/6J雄性小鼠作为正常对照组(n=20)。电针穴位组小鼠电针“百会”“风府”和双侧“肾俞”穴位16周后(每天20 min,每周6 d),水迷宫检测其学习记忆功能;免疫组化染色检测海马齿状回β-淀粉样蛋白老年斑表达;免疫荧光双标检测海马齿状回Brd U/Neu N和Brd U/GALC的表达;免疫印迹检测海马神经元特异性蛋白Nestin和少突胶质细胞特异性蛋白GALC的表达水平;实时荧光定量PCR和免疫印迹检测海马Notch1和Hes1的m RNA及蛋白水平。结果与结论:(1)相对于正常对照组,模型组小鼠学习记忆能力明显下降;海马齿状回β-淀粉样蛋白老年斑明显增多(P<0.01);海马GALC和Nestin表达明显减少(P<0.01,P<0.05);(2)相对于模型组,电针穴位组小鼠学习记忆能力明显增加;海马齿状回β-淀粉样蛋白老年斑明显减少(P<0.01);海马Brd U/Neu N双标阳性细胞和Nestin蛋白表达明显增多(P<0.01,P<0.05);海马区GALC表达明显增多(P<0.01);海马区Notch1的m RNA及蛋白水平均明显升高(P<0.05,P<0.01);海马区Hes1的m RNA及蛋白水平均明显下降(P<0.05);(3)结果表明,电针阿尔茨海默病模型小鼠“百会”“风府”和双侧“肾俞”促进内源性神经干细胞向神经元和少突胶质细胞方向增殖分化,此作用可能由Notch1/Hes1通路调节。

关键词：阿尔茨海默病电针小鼠学习记忆神经元少突胶质细胞 Notch通路

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In situ LA-ICP-MS analyses of mica and wolframite from the Maoping tungsten deposit,southern Jiangxi,China

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Acta Geochimica 2020年第6期39卷 811-829页

作者： Guanghong Chen jianfeng gao Jianjun Lu Rongqing Zhang State Key Laboratory for Mineral Deposits Research School of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China

The Maoping tungsten deposit is located in the Nanling W-Sn metallogenic belt in South *** and quartz vein types of mineralization developed in this *** occurs in the *** is occurs mainly in greisen and wolframite-quartz veins whereas phengite is found in the underground quartz *** granite and greisen,protolithionite,and zinnwaldite are partly replaced by ***-ICP-MS trace element analyses of micas and wolframite are employed to characterize the ore-forming source and evolution of ore forming *** show compositional variation trend in vertical directions with a decrease of W,Sn,Nb,and Ta and an increase of MgO,V,Ni,and *** in greisen has higher Mo,Sn,Nb,Ta,and REEs than those in quartz *** wolframites show similar REE patterns with enrichment of *** in greisen and quartz veins have negative Eu anomalies,while wolframites in quartz veinlet display positive Eu *** of mica and wolframite from different mining levels of the Maoping deposit suggest that the ore-forming fluids are dominated by magmatic hydrothermal fluids in the deep with a slight addition of meteoric water in the *** fractureinduced depressurization and fluid mixing controlled the evolution of ore-forming fluids and possibly lead to the wolframite deposition.

关键词： Mica Wolframite Magmatic-hydrothermal evolution In situ analysis Quartz-vein type W deposit

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Determination of rhenium and osmium by ICP-MS for galena and sphalerite

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Acta Geochimica 2016年第1期35卷 43-49页

作者： Yingying Liu Liang Qi jianfeng gao Zhilong Huang State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550180 China University of Chinese Academy of Sciences Beijing 100049China

Digestion with aqua regia in a Carius tube and separation of Re with anion exchange resin is commonly employed for Re–Os dating of molybdenite and ***, the recovery of Re is extremely low when this routine anion exchange method is applied to galena,causing difficulty in Re–Os dating of galena. In this study,we investigated the mechanism of Re loss during sample preparation and tested a revised procedure for Re–Os dating of galena and sphalerite.

关键词： Galena Sphalerite Rhenium and osmium Anion exchange resin ICP-MS

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Germanium in Magnetite:A Preliminary Review

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Acta Geologica Sinica(English Edition) 2017年第2期91卷 711-726页

作者： MENG Yumiao HU Ruizhong HUANG Xiaowen gao jianfeng State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China

Magnetite is a very common mineral in various types of iron deposits and some sulfide deposits. Recent studies have focused on the use of trace elements in magnetite to discriminate ore types or trace ore-forming process. Germanium is a disperse element in the crust, but sometimes is not rare in magnetite. Germanium in magnetite can be determined by laser ablation ICP-MS due to its low detection limit（0.0X ppm）. In this study, we summary the Ge data of magnetite from magmatic deposits, iron formations, skarn deposits, iron oxide copper-gold deposits, and igneous derived hydrothermal deposits. Magnetite from iron formations contains relatively high Ge（up to ~250 ppm）, whereas those from all other deposits mostly contains Ge less than 10 ppm, indicating that iron formations can be discriminated from other Fe deposits by Ge contents. Germanium in magmatic/hydrothermal magnetite is controlled by a few factors. Primary magma/fluid composition may be the major control of Ge in magnetite. Higher oxygen fugacity may be beneficial to Ge partition into magnetite. Sulfur fugacity and temperature may have little effect on Ge in magnetite. The enrichment mechanism of Ge in magnetite from iron formations remains unknown due to the complex ore genesis. Germanium along with other elements（Mn, Ni, Ga） and element ratios（Ge/Ga and Ge/Si raios） can distinguish different types of deposits, indicating that Ge can be used as a discriminate factor like Ti and V. Because of the availability of in situ analytical technique like laser ablation ICP-MS, in situ Ge/Si ratio of magnetite can serve as a geochemical tracer and may provide new constraints on the genesis of banded iron formations.

关键词： germanium magnetite controlling factor iron deposits discriminate factor

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Land-use induced changes in topsoil organic carbon stock of paddy fields using MODIS and TM/ETM analysis:A case study of Wujiang County,China

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Journal of Environmental Sciences 2008年第7期20卷 852-858页

作者： gao, jianfeng PAN, Genxing JIANG, Xiaosan PAN, Jianjun ZHUANG, Dafang Institute of Resources Ecosystem and Environment of Agriculture Nanjing Agricultural University Nanjing 210095 China Institute of Geographical Science and Natural Resources Chinese Academy of Sciences Beijing 100101 China

Topsoil soil organic carbon (SOC) that plays an important role in mitigating atmospheric carbon dioxide (CO_2) buildup is greatly affected by human *** evaluate the influence of land-use changes on SOC stocks in paddy soils,a new algorithm was developed by integrating MODIS (moderate resolution imaging spectral-radiometer) and TM/ETM data for timely monitoring the land-use change in Wujiang ***,the land-use class-maps derived from MODIS and TM/ETM analyses were further used to estima...

关键词： soil organic carbon (SOC) MODIS TM/ETM rice paddies land-use soil C sequestration

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Trace element composition of magnetite from the Xinqiao Fe–S(–Cu–Au) deposit, Tongling, Eastern China: constraints on fluid evolution and ore genesis

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Acta Geochimica 2018年第5期37卷 639-654页

作者： Yichang Wang jianfeng gao Xiaowen Huang Liang Qi Chuan Lyu State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550081 China University of Chinese Academy of Sciences Beijing 100049China

The Xinqiao deposit is one of several polymetallic deposits in the Tongling ore district. There are two types of mineralization in the Xinqiao： skarn-type and stratiform-type. The skarn-type mineralization is characterized by iron oxides such as magnetite and hematite, whereas stratiform-type mineralization is characterized by massive sulfides with small amounts of magnetite and hematite. We defined three types of ores within the strati- form-type mineralization by the mineral assemblages and ore structures. Type Ⅰ ore is represented by magnetite crosscut by minor calcite veins. Type Ⅱ is a network ore composed of magnetite and crosscutting pyrite. Type Ⅲ is a massive ore containing calcite and hematite. Type Ⅰ magnetite is characterized by highly variable trace element content, whereas Type Ⅱ magnetite has consistently higher Si, Ti, V, and Nb. Type Ⅲ magnetite contains more In, Sn, and As than the other two types. Fluid-rock interaction, oxygen fugacity （fO2）, and temperature （T） are the main factors controlling element variation between the different magnetite types. Type I magnetite was formed by more extensive fluid-rock interaction than the other two types at moderate fO2 and T conditions. Type Ⅱ magnetite is thought to have formed in relatively low fO2 and high-Tenvironments, and Type Ⅲ in relatively high fOe and moderate-T environments. Ca ＋ Al ＋ Mn and Ti ＋ V discrimination diagrams show that magnetite in the Xin qiao deposit is hydrothermal in origin and is possibly linked with skarn.

关键词： Xinqiao Skarn Magnetite In-situ analysis Tongling

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Design and fabrication of compact Ge-on-SOI coupling structure

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Frontiers of Optoelectronics 2019年第3期12卷 276-285页

作者： jianfeng gao Junqiang SUN Heng ZHOU Jialin JIANG Yang ZHOU Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China

In this paper, we have proposed and demonstrated a simple approach to fabricate vertical integrated structure for coupling between active germanium (Ge) waveguide and silicon-on-insulator (SOI) waveguide. The active Ge waveguide is sputtered after etching the underlying passive silicon (Si) waveguide. This method scuttles away from the difficulty involved in the waveguide fabrication by avoiding the etching process for the Ge waveguide, and thereby the waveguide quality is improved. The influences of the coupling structural parameters on the coupling loss are analyzed and discussed. The optimizing parameters are obtained for the fabrication. The minimal coupling loss is experimentally measured about 2.37 dB, and variation tendency of coupling loss against the structural parameters is consistent with the theoretical result. The proposed approach offers an effective path for vertical coupling between Ge and SOI optical components.

关键词： taper coupler integrated optics device guided waves silicon-on-insulator (SOI) waveguide germanium (Ge) waveguide active Ge device Ge-on-SOI coupling structure

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Strain rate sensitivity of tensile properties in high Nb containing TiAl alloys

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Journal of University of Science and Technology Beijing 2005年第6期12卷 535-539页

作者： jianfeng gao Xiangjun Xu Junpin Lin Xiping Song Yanli Wang Guoliang Chen State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

The effect of strain rate on the yield strength of high Nb containing TiAl alloy was studied. The results show that the strain rate sensitivity varies with the test temperature, and the yield strength is not sensitive to the strain rate at room temperature but significantly sensitive to the strain rate at high temperature. An increase of the strain rate or a decrease of the temperature results in an obvious change of fracture mode. It is found that the strain rate sensitivity of this alloy varying with temperature is due to the dislocation climb generated at high temperature.

关键词： TiAl alloys strain rate tensile properties thermal activation

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