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Cenozoic volcanism and lithospheric tectonic evolution in Qiangtang area, northern Qinghai-Tibet Plateau

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Science China Earth Sciences 2005年第7期48卷 1011-1024页

作者： CHI xiaoguo li Cai JIN Wei College of Earth Sciences Jilin University Changchun 130061 China College of Earth Sciences Jilin University Changchun 130061 China College of Earth Sciences Jilin University Changchun 130061 China

Following the collision between the Indian and Eurasian plates, the Cenozoic vol- canic activities are rather frequent in the Qiangtang area of northern Qinghai-Tibet Plateau. They can be divided into four series: alkaline basalt series, high-K calc-alkaline series, shoshonitic series and peralkaline potassic-ultrapotassic series. Geochemical data suggest that the magma sources of Cenozoic volcanic rocks have transferred from spinel lherzolite mantle in the early stage to garnet peridotite enriched mantle (EM2) in the later stage. The high Mg# number and extremely high Cr-Ni-Co abundance of high-K calc-alkaline and shoshonitic series andesites in the Qiangtang area indicate that the primary magma might be derived from subduction of conti- nent lithosphere from the Lhasa block. Incompatible element ratios of La/Rb, Zr/Rb, Rb/Nb, K/Nb, Pb/La and K/La of peralkaline potassic-ultrapotassic series lavas in northern Qinghai-Tibet Pla- teau are lower than island arc volcanic rocks and higher than and similar to oceanic island ba- salts. This signature indicates that the primary magma derive from a paleo-mantle wedge inter- fused by fluids derived from asthenosphere and/or subducted mantle lithosphere. But the above element ratios of ultrapotassic lavas in southern Tibet and ultrapotassic lamprophyres in eastern Tibet are higher than and similar to island arc volcanic rocks, which means that the primary magma sources contained a large quantity of crust contaminant from fluids and/or melts derived from subducted continent lithosphere. The studies result supports that the indian continental lithosphere has underthrust beneath Tibet to about the middle of the plateau, and Eurasian (Qaidam basin) mantle lithosphere has underthrust beneath the Qiangtang area of northern Tibet Plateau. In the paper we demonstrate further that the pulsing cycles of potassic-ultrapotassic volcanism of the Qinghai-Tibet Plateau result from an asthenospher pulsing upwelling caused by the intraplate s

关键词： Cenozoic volcanism magmatic source lithosphere tectonic evolution northern Tibet.

Highly efficient flexible perovskite solar cells with vacuum-assisted low-temperature annealed SnO2 electron transport layer

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Journal of Energy Chemistry 2022年第4期31卷 1-7页

作者： xiaoguo li Zejiao Shi Fatemeh Behrouznejad Mohammad Hatamvand Xin Zhang Yaxin Wang Fengcai liu Haoliang Wang Kai liu Hongliang Dong Farhan Mudasar Jiao Wang Anran Yu Yiqiang Zhan Center for Micro Nano Systems School of Information Science and Technology(SIST)Fudan UniversityShanghai 200433China Academy for Engineering&Technology Fudan UniversityShanghai 200433China Center for High Pressure Science and Technology Advanced Research PudongShanghai 201203China

The demand for lightweight, flexible, and high-performance portable power sources urgently requires high-efficiency and stable flexible solar cells. In the case of perovskite solar cells(PSCs), most of the common electron transport layer(ETL) needs to be annealed for improving the optoelectronic properties,while conventional flexible substrates could barely stand the high temperature. Herein, a vacuumassisted annealing SnO_(2) ETL at low temperature(100℃) is utilized in flexible PSCs and achieved high efficiency of 20.14%. Meanwhile, the open-circuit voltage(V_(oc)) increases from 1.07 V to 1.14 V. The flexible PSCs also show robust bending stability with 86.8% of the initial efficiency is retained after 1000 bending cycles at a bending radius of 5 mm. X-ray photoelectron spectroscopy(XPS), atomic force microscopy(AFM), and contact angle measurements show that the density of oxygen vacancies, the surface roughness of the SnO_(2) layer, and film hydrophobicity are significantly increased, respectively. These improvements could be due to the oxygen-deficient environment in a vacuum chamber, and the rapid evaporation of solvents. The proposed vacuum-assisted low-temperature annealing method not only improves the efficiency of flexible PSCs but is also compatible and promising in the large-scale commercialization of flexible PSCs.

关键词： Flexible perovskite solar cells Vacuum-assisted Electron transport layer Trap-assisted recombination

RELATION BETWEEN RAPID UPliFTING AND GRAVITATIONAL EQUIliBRIUM ,TECTONICS AND THERMODYNAMIC EFFECT IN QINGHAI—TIBET PLATEAU

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地学前缘 2000年第S1期7卷 336-338页

作者： Chi xiaoguo,li Cai, liu Shen, Yang Rihong (Changchun University of Science and Technology,Changchun 130026,China)

The distribution of the Mountain ranges, Plateau as well as the distribution of continents and oceans on the earth’s surface are the embodies of the structure and heat states of the materials at the deep crust and of the tectonic stress of regions. There should be a prevalent corresponding between terrestrial height and the texture, thermal and stress states of lithosphere. However, there is no a general consensus on what extent different factors affecting the height of a terrain should be up to now, and this is very apparent for the models of plateau uplifting.1\ Debates on the compensatory depth of crustal equilibrium\;Based on a previous equilibrium model, Woollard(1969) set up an equation to show the relation among the crustal thickness ( D \-m), the depth of Mohorovicic discontinuity(M)and height above sea level( H):D \-m=33.2+8.5 H (km). By this equation it is implied that equilibrium compensation has been reached at the depth of Mohorovicic discontinuity for the height of a terrain. As Woollard (1970)described, there is no evidence to show that mass distribution beneath the Mohorovicic discontinuity ever played an important roles in the equilibrium compensation of the crust.

关键词： gravitional compensation tectonism thermal action uplifting of plateau

CENOZOIC VOLCANISM AND liTHOSPHERETECTONIC EVOLUTION IN NORTH TIBET

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地学前缘 2000年第S1期7卷 153-154页

作者： Chi xiaoguo, li Cai, Jin Wei, liu Shen, Yang Rihong (Changchun University of Science and Technology,Changchun 130026, China)

Volcanism is the direct indication of the upper mantle thermodynamic activities, and it is an efficient path to study the lithosphere tectonic evolution. Cenozoic volcanism in North Tibet is of obviously time circles. In the space, from south to north, the chemical composition of volcanics changed from Na\|rich alkalic basaltic series formed 44Ma. ago into high\|K calcalkali series formed in about 40～*** Qiangtang area, into minor amount of leucite basalt and phonolite series of 26Ma., further into shoshonite series aged at 19～7Ma. in Cocoxili basin, until Quaternary shoshonite series in Karakunlun and Qilian Mt.\|Yumen region(xiaoguo Chi etc.1999).Isotopes of Sr,Nd,Pb and trace elements in volcanic rocks provide wide range of information for the evolution of lithosphere in North Tibet after 45Ma. Present research shows that Na\|rich alkalic basalt series formed 44Ma. ago has the features of a primitive mantle in Sr,Nd,Pb isotopes. Along with the evolutionary tendency to high\|K calcalkali series and phonolite series, isotopes of Sr,Nd,Pb evolve towards EM2\|rich mantle end. The North Tibet is a compound continental mass combined from several terrains of different geological periods and the lithosphere mantle sees a complicated evolutionary history. Hence, the mixing of different rocks in ancient subduction zones and long history of metasomatism in the upper mantle offered excellent and favorable conditions for the formation of EM2 mantle end and for potassic enrichment. Isotopic evolutionary features indicate that the early magma came from the asthenosphere while later magmas were derived from partial remelting of lithosphere mantle.

关键词： volcanism evolution of lithosphere North Tibet

Attaching Organism Community Characteristics of Different Surface Treatments on Artificial Reef Tem-plates Inshore of Yuanzhou Island

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Animal Husbandry and Feed Science 2016年第1期8卷 34-38页

作者： Wang lianlian Chen Pimao Feng Xue li xiaoguo Luo Hongxia Dalian Ocean University Dalian 116023China South China Sea Fisheries Research Institute Chinese Academy of Fishery Science/Scientific Observ-ing and Experimental Station of South China Sea Fishery Resources and EnvironmentMinistry of Agriculture/Key Laboratory of Marine Ranching TechnologyCAFSGuangzhou 510300China

In order to understand the biological community characteristics of different surface treatments of ＇artificial reef templates ,which had been placed on the offshore, Yuanzhou island, Daya Bay. Sampling survey was taken in August of 2014. The results showed that 39 species of fouling organisms were collected and iden- tiffed, Ostrea nigromarginata has attached the absolute position of the dominant species ; Through the concrete block surface treatment has a better biofouling effect, and red brick, granite plates and no-surface-treated concrete template attached biomass and abundance of organisms were very low ; Biomass and abundance indices and ecological indices do not show a certain degree of regularity.

关键词： Surface treatment Artificial reef template Attaching organisms Community characteristics

三元孔道结构纳米ZSM-5分子筛团聚体的合成

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无机盐工业 2020年第12期52卷 104-108页

作者：李孝国米晓彤侯章贵中海油炼油化工科学研究院北京102200

采用正丁胺和ZSM-5晶种双模板体系水热合成了一系列ZSM-5分子筛,考察了晶种、正丁胺添加量和晶化条件对分子筛物理化学性能、孔道结构和形貌的影响。对所得分子筛分别进行X射线衍射(XRD)、氮气吸-脱附、扫描电子显微镜(SEM)表征分析。... 详细信息

采用正丁胺和ZSM-5晶种双模板体系水热合成了一系列ZSM-5分子筛,考察了晶种、正丁胺添加量和晶化条件对分子筛物理化学性能、孔道结构和形貌的影响。对所得分子筛分别进行X射线衍射(XRD)、氮气吸-脱附、扫描电子显微镜(SEM)表征分析。结果表明:分子筛为三元孔道结构的纳米ZSM-5分子筛团聚体,正丁胺和晶种在合成过程中具有协同作用。在正丁胺与二氧化硅物质的量比为0.26、晶种添加量为3%(质量分数)、在120℃晶化24 h后再在170℃晶化48 h条件下合成的分子筛总比表面积和外比表面积分别为364 m^2/g和59 m^2/g。

关键词：纳米ZSM-5分子筛团聚体正丁胺晶种协同作用

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消化内科下消化道出血的临床诊断和治疗

中国卫生标准管理 2018年第7期9卷 38-39页

作者：李孝国梁山肛肠病医院内科山东济宁272600

目的分析消化内科下消化道出血的临床诊断和治疗。方法选取2014连4月—2016年3月在我院接受治疗的消化内科下消化道出血患者80例作为研究对象,对患者实施内镜检查,对于确诊病情的患者根据具体情况开展治疗,具体方法包括药物治疗和手术... 详细信息

目的分析消化内科下消化道出血的临床诊断和治疗。方法选取2014连4月—2016年3月在我院接受治疗的消化内科下消化道出血患者80例作为研究对象,对患者实施内镜检查,对于确诊病情的患者根据具体情况开展治疗,具体方法包括药物治疗和手术治疗等。结果通过内镜检查所有患者的病情得到确诊,经治疗,患者病情得到有效控制,治疗总有效率达到95.8%。结论消化内科下消化道出血通过内镜检查可以确诊;针对下消化道出血的治疗,一般需要对症治疗,部分患者则需要开展手术,临床治愈率较高。

关键词：消化内科下消化道出血诊断治疗

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不同种类抗生素临床治疗呼吸道感染疗效观察

中国继续医学教育 2016年第33期8卷 206-207页

作者：李孝国梁山肛肠病医院内科山东济宁272600

目的分析不同种类抗生素治疗呼吸道感染的临床治疗效果。方法选取本院2014年1月~2015年1月接收的呼吸道感染疾病患者300例作为研究对象,随机分为三组各100例,分别为头孢唑肟组、左氧氟沙星组以及阿奇霉素组,对比3种抗生素药物应用后的... 详细信息

目的分析不同种类抗生素治疗呼吸道感染的临床治疗效果。方法选取本院2014年1月~2015年1月接收的呼吸道感染疾病患者300例作为研究对象,随机分为三组各100例,分别为头孢唑肟组、左氧氟沙星组以及阿奇霉素组,对比3种抗生素药物应用后的治疗总有效率、药物不良反应发生率。结果三组抗生素的治疗总有效率分别为92%、94%、95%,三组相比,组间差异无统计学意义（P〉0.05）。此外三组患者均未出现明显的不良反应。结论在呼吸道感染的临床治疗中,可以采用多种抗生素,其中头孢唑肟、左氧氟沙星以及阿奇霉素均具有良好的临床效果和安全性,可根据患者的个体情况进行科学选择。

关键词：抗生素呼吸道感染疗效观察

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心内科住院患者医院感染的临床分析

中国卫生产业 2013年第27期10卷 1-1,3页

作者：李孝国梁山县徐集中心卫生院山东济南272600

目的对心内科住院患者医院感染的临床情况进行研究与分析。方法采用统计分析的方法,对本院心内科住院患者在医院的感染情况进行分析。结果本次共调查356例在我院住院的心内科患者,发生9例医院内感染,感染率为2.53%,感染的患者原发病都... 详细信息

目的对心内科住院患者医院感染的临床情况进行研究与分析。方法采用统计分析的方法,对本院心内科住院患者在医院的感染情况进行分析。结果本次共调查356例在我院住院的心内科患者,发生9例医院内感染,感染率为2.53%,感染的患者原发病都是心脏病。患者的感染部位以呼吸道为主,占66.67%,其次是泌尿道感染,占22.2%。导致住院患者感染的危险因素主要是患者年龄以及合并有基础病等等。结论心内科住院患者医院感染应通过加强基础护理以及治疗等方式来降低感染的发生率,医院应严格进行无菌操作。

关键词：心内科住院患者医院感染