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There discovery of alpine oak (Heterobalanus group, Quercus section Ilex, Fagaceae) fossils from Mount Shisha Pangma and its significance

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ACTA PETROLOGICA SINICA 2024年第5期40卷 1382-1393页

作者： Su, Tao Liu, jia Chen, Linlin Huang, Jian Zhang, Xinwen Wu, Feixiang Ni, Xijun Deng, Tao Zhou, Zhekun chengdu univ technol Inst Sedimentary Geol MNR Key Lab Deeptime Geog & Environm Reconstruct Chengdu 610059 Peoples R China chengdu univ technol State Key Lab Oil & Gas Reservoir Geol & Exploita Chengdu 610059 Peoples R China Chinese Acad Sci Xishuangbanna Trop Botan Garden CAS Key lab Trop Forest Ecol Mengla 666303 Peoples R China univ Bristol Sch Geograph Sci Bristol BS8 1QU Avon England Chinese Acad Sci Inst Vertebrate Paleontol & Paleoanthropol CAS Key Lab Veribrate Evol & Human Origins Beijing 100044 Peoples R China

We reported alpine oak fossil leaves ( the Heterobalanus group, Quercus section Ilex, Fagaceae) rediscovered on Mount Shisha Pangma. According to twice field investigations, the fossil site is located at the front of the No. 5 glacier tongue on the south side of the Dasuopu Glacier at an altitude of about 5800m on the north slope of Shisha Pangma Peak. These fossils are from the siltstone interlayer dominated by sandy conglomerate in the lower part of the Yebokangjiale Group. These newly discovered fossil leaves have typical characteristics of alpine oaks, including oval or oblong leaf, thick and short petiole, entire or toothed leaf margin, and 5 similar to 6 pairs of secondary veins, which is completely consistent with the leaf morphology of alpine oaks from Mount Shisha Pangma reported previously. Through morphological comparison with living and fossil species in this group, as well as quantitative analysis combined with geometric morphometry, these fossil leaves from Mount Shisha Pangma were assigned to Quercus preguajavifolia Tao. Alpine oaks may originate in southeastern margin of the Qinghai -Tibetan Plateau, then thrive locally and spread into regions nearby accompanying by the uplift of the plateau. The implication of alpine oak fossil leaves from Mount Shisha Pangma on paleoelevation needs to be further investigated due to the present wide range and the uncertainty of these fossils. The rediscovery of alpine oak fossils from Mount Shisha Pangma not only helps to clarify the specific layers bearing these fossils, but also further enriches the morphological characteristics of this fossil record and its systematic position. This discovery would provide important basis for better revealing the evolution of biodiversity and environmental changes in the middle part of the Himalaya during the Cenozoic.

关键词： Heterobalanus Leaf fossil Himalaya Mountain uplift Biodiversity Neogene LATE MIOCENE TIBETAN PLATEAU ELEVATION EXHUMATION EVOLUTION HIMALAYA OROGEN UPLIFT

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Palynological assemblages and paleoenvironmental evolution in the Gyirong Basin since Middle Miocene

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ACTA PETROLOGICA SINICA 2024年第5期40卷 1418-1428页

作者： Liu Jia Song Ai Zhang XinWen Gao Yi Chen LinLin Liu Binxu Su Tao chengdu univ technol Inst Sedimentary Geol MNR Key Lab Deep Time Geog & Environm Reconstruct Chengdu 610059 Peoples R China Chinese Acad Sci CAS Key Lab Trop Forest Ecol Xishuangbanna Trop Bot Garden Mengla 666303 Peoples R China Yunnan univ Sch Earth Sci Kunming 650500 Yunnan Peoples R China univ Bristol Sch Geog Sci Bristol BS8 1QU Avon England

The formation and evolution of the Himalaya orogeny, resulted from the collision between the Indian and Eurasian plates, has long captivated researchers in earth and life sciences. Late Cenozoic fluvio.lacustrine sedimentary basins, distributed along the Southern Tibet Detachment System on the northern slope of the Himalaya, have documented the evolution of the orogeny and paleoenvironmental changes. This study presents palynological analysis on the Danzengzhukang Formation, Woma Formation and Gongba Formation in the Gyirong Basin in the central Himalaya, to explore the sedimentary stratigraphy of the basin and the processes of Himalaya uplift and environmental effects. Based on palynological analysis, the deposition age of the Danzengzhukang Formation is revised to the Middle Miocene. Palynological assemblages reveal that since Middle Miocene, vegetation in the Gyirong Basin has transitioned from a mixed coniferous and broad.leaved forest to sparse woodlands and grasslands in Late Miocene. Subsequently, during the late Late Miocene and Pliocene, it evolved into alpine meadows, eventually forming the present.day alpine shrub and meadow vegetation since the Early Pleistocene. Paleoelevation analysis results indicate that the elevation of the Gyirong Basin has remained relatively similar to the present elevation since Middle Miocene, with no significant uplift during the deposition of the Danzengzhukang Formation and Woma Formation

关键词： ENVIRONMENTAL-CHANGES TIBETAN PLATEAU UPLIFT MONSOON ORIGIN AGE

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Experimental and numerical simulation study on the erosion behavior of the elbow of gathering pipeline in shale gas field

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Petroleum Science 2024年第2期21卷 1257-1274页

作者： En-Bin Liu Shen Huang Ding-Chao Tian Lai-Min Shi Shan-Bi Peng He Zheng Petroleum Engineering School Southwest Petroleum UniversityChengdu 610500SichuanChina Chongqing Natural Gas Sales Center Natural Gas BranchSinopecChongqing400023China Zhejiang Zheneng Natural Gas Operation Co. Ltd.Hangzhou 310000ZhejiangChina School of Civil Engineering and Architecture Southwest Petroleum UniversityChengdu 610500SichuanChina Louisiana Tech univ Trenchless Technol Ctr599 Dan Reneau DrRustonLA71270USA Southwest Oil and Gas Field Branch Natural Gas Research Institute Chengdu 610213SichuanChina

During the production period of shale gas, proppant particles and rock debris are produced together,which will seriously erode the elbows of gathering pipelines. In response to this problem, this paper takes the elbow of the gathering pipeline in the Changning Shale Gas Field as an example to test the erosion rate and material removal mechanism of the test piece at different angles of the elbow through experiments and compares the four erosion models with the experimental results. Through analysis, it is found that the best prediction model for quartz sand-carbon steel erosion is the Oka model. Based on the Oka model, FLUENT software was used to simulate and analyze the law of erosion of the elbow of the gas gathering pipeline under different gas flow velocities, gas gathering pressure, particle size, length of L1,and bending directions of the elbow. And a spiral pipeline structure is proposed to reduce the erosion rate of the elbow under the same working conditions. The results show that this structure can reduce erosion by 34%.

关键词： Shale gas Gas gathering pipeline Elbow Erosion CFD

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Recent progress in ternary mixed matrix membranes for CO_(2) separation

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Green Energy & Environment 2024年第5期9卷 831-858页

作者： Zikang Qin Yulei Ma Jing Wei Hongfang Guo Bangda Wang Jing Deng Chunhai Yi Nanwen Li Shouliang Yi Yi Deng Wentao Du Jian Shen Wenju Jiang Lu Yao Lin Yang Zhongde Dai College of Architecture and Environment Sichuan UniversityChengdu610065China College of Carbon Neutrality Future technology Sichuan UniversityChengdu610065China National Engineering Research Centre for Flue Gas Desulfurization Chengdu610065China Carbon Neutral technology Innovation Center of Sichuan Chengdu610065China School of Chemical Biological and Materials EngineeringUniversity of OklahomaNormanOK73019USA Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an710049China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China US DOE Natl Energy Technol Lab626 Cochrans Mill RdPittsburghPA 15236USA DongFang Boiler Co. Ltd.China Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province Chengdu611731China College of Environment and Resources Xiangtan UniversityXiangtan411105China

Mixed matrix membranes(MMMs)could combine the advantages of both polymeric membranes and porousﬁllers,making them an effective alternative to conventional polymer membranes.However,interfacial incompatibility issues,such as the presence of interfacial voids,hardening of polymer chains,and blockage of micropores by polymers between common MMMsﬁllers and the polymer matrix,currently limit the gas sep-aration performance of MMMs.Ternary phase MMMs(consisting of aﬁller,an additive,and a matrix)made by adding a third compound,usually functionalized additives,can overcome the structural problems of binary phase MMMs and positively impact membrane separation performance.This review introduces the structure and fabrication processes for ternary MMMs,categorizes various nanoﬁllers and the third component,and summarizes and analyzes in detail the CO_(2) separation performance of newly developed ternary MMMs based on both rubbery and glassy polymers.Based on this separation data,the challenges of ternary MMMs are also discussed.Finally,future directions for ternary MMMs are proposed.

关键词： CO_(2) separation Mixed matrix membranes Ternary phase

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Advanced hemocompatible polyethersulfone composite artificial lung membrane with efficient CO_(2)/O_(2)exchange channel constructed by modified carbon nanotubes network

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Journal of Materials Science & technology 2023年第29期160卷 181-193页

作者： Yunbo Feng Qian Wang Shudong Sun Weifeng Zhao Changsheng Zhao College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China School of Chemical Engineering Sichuan UniversityChengdu 610065China

Artificial lung membranes as the core module of the extracorporeal membrane oxygenation technology(ECMO)execute the function of extracorporeal blood-gas barrier accomplishing CO_(2)/O_(2)exchange with blood.However,the unsatisfactory hemocompatibility and difficulty in functionalization are the promi-nent challenges faced by current artificial lung membrane materials.In this study,polyethersulfone(PES)composite membranes with self-anticoagulant property and high gas exchange efficient are fabricated by blending PES matrix with poly(vinylamine)(PVAm)modified carboxylic carbon nanotubes(mCNTs)and citrate-based poly(octamethylene-citrate)(POC)pre-polymers.The mCNTs construct specific gas transfer channels within the composite membranes to enhance the gas permeability,while the POC pre-polymers provide anticoagulant property based on the chelation to blood Ca^(2+)and the inactivation effect to in-trinsic coagulation factors.Importantly,directed by the actual ECMO gas exchange mode,we design a gas-liquid convectional circulation device that could evaluate gas exchange efficiency for the composite membranes under mimetic ECMO state.Therefore,this strategy not only proposes a new design method of advanced artificial lung membranes to solve the practical challenges in the current ECMO technology,but also establishes a scientific testing method to evaluate the gas exchange performance for new-type artificial lung membrane materials in the future.

关键词： Composite membrane material Modified carbon nanotubes Artificial lung membranes Hemocompatibility Gas exchange

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ANALYSIS OF BASSET FORCE OF PARTICLE MOTION IN TURBULENT FLOWS WITH SPECTRAL METHOD

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Journal of Hydrodynamics 2001年第4期13卷 88-91页

作者： Liu, Xiao-Bing Wang, Jing Li, Qing-Gang Sichuan univ. of Sci. and technol. Chengdu 610039 China

Using the spectral method from the Lagrangian particle motion equation, the particle motion statistics in solid-liquid turbulent flows, including the particle Lagrangian energy spectrum, autocorrelation function and turbulent diffusivity, were analyzed. The effects of the Basset term on these statistics were examined. It is found that the Basset force may be neglected in the Lagrangian equation of particle motion only when a dimensionless number N is very small and the particle diameter, in general, is less than 0.1 mm. The numerical results indicate that the particle diffusivity may exceed the fluid diffusivity for significantly long period.

关键词： Turbulent flow

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Ionomer Toughened Polyolefine

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Journal of Materials Science & technology 1995年第6期11卷 391-397页

作者： Xi XU Xiangshen ZENG Shaoyun GUO and Huilin LI (Polymer Research Institute and the State Key Laboratory of Polymer Materials Engineering,chengdu Uuiversity of Science and technology, chengdu, 610065, China) chengdu univ SCI & technol STATE KEY LAB POLYMER MAT ENGNCHENGDU 610065PEOPLES R CHINA

The morphology and properties of HDPE blends with Zn-SEPDM and GR were studied through SEM and mechanical property test. The results show that as Zn-SEPDM/GR content amounts to 20%, the blend becomes an IPN in structure, and that a rather high impact and tensile strength of HDPE may be obtained after blending. The antistatic effect, the softening point,and HDT of the blend are higher as compared to HDPE/Zn-SEPDM/ZnSt (zinc stearate).The effect of Zn-SEPDM on the compatibility the morphology and properties of IPP blends were studied by DSC, TEM and mechanical properties test. The results show that as Zn-SEPDM content exceeds 20%. Zn-SEPDM in the blend becomes continuous and an abrupt change in impact strength is incurred there from. Owing to the incorporation of ionic groups into EPDM.the strong interactions betWeen the chains make both the impact and the tensile strength of IPP remarkably higher

关键词： Zn EPDM HDPE PP GR Ionomer Toughened Polyolefine

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STUDY ON HIGH ACID LEACHING REACTIVE CALCINED KAOLIN

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Journal of Wuhan university of technology(Materials Science) 1999年第1期14卷 19-24页

作者： Zhang, Qichun Yi, Qiaoming chengdu Inst technol Dept Mat Sci & Engn Chengdu 610059 Peoples R China

Leaching experiments on metakaolin show that the final Al extraction ratio reached in a batch reaction is strikingly influenced by the inferior pore structure geometry of the metakaolin pellets. By calcining kaolin particles adhered in low humidity state, a variety of metakaolin pellet, inside which a large openings structure developed, has been prepared. The structure remarkably benefits leachant ion transference, so, the variety has high acid leaching reactivity, even coarse as the pellets are, its aluminum extracted ratio still has a linear relationship with leaching time, and the leaching kinetics is maintained zero order up to a significant conversion degree. A revised Pellet-Particle Model has been developed to interpret the structure influence on Al extraction ratio. (Author abstract) 4 Refs.

关键词： large openings structure aluminum extraction reactivity

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Biomineralization in the La' erma Gold Deposit of the Western Qinling Mountains

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Acta Geologica Sinica(English Edition) 1998年第1期72卷 65-76页

作者： LIN Li and ZHU LidongDepartment of Geology, chengdu Institute of technology, chengdu, Sichuan 610059 Zhang Yuxu Fei Zhenbi chengdu Inst technol Dept Geol Chengdu 610059 Sichuan Peoples R China

Geological and geochemical studies and experiments on mineralization indicate that the source bed of the La' erma gold deposit in the south subbelt of the western Qinling Mountains is hydrothermal cherts in the Cambrian Taiyangding Group. Organic geochemical study of the cherts shows that the organic precursors intimately associated with gold are marine bacteria and algae. The gold content in chert,is positively correlated with the amount of bacterial and algal microfossils, and simulation experiments on biomineralization of modern bacteria and algae indicate that bacteria and algae played an important role in the formation of the La' erma gold deposit.

关键词： biomineralization La' erma gold deposit Taiyangding Group source bed

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A new type of wave in waveguide filled with magnetized plasma

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Chinese Science Bulletin 1999年第15期44卷 1360-1363页

作者： Shenggang Liu Yang Yan Dajun Zhu univ Elect Sci & technol China Chengdu 610054 Peoples R China

A new type of wave containing quasi-static part is found and studied. Characteristics of this wave are analyzed, and the theoretical analysis is consistent with the numerical calculation.

关键词： magnetized plasma waveguide quasi-static new type of wave.

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