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Eogenetic Karst in Interbedded Carbonates and Evaporites and Its Impact on Hydrocarbon Reservoir: A New Case from Middle Triassic Leikoupo Formation in Sichuan Basin, Southwest China

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Journal of Earth Science 2019年第5期30卷 908-923页

作者： Hong liu Xiucheng Tan Ling Li xiong Ding jian Cao Guang Yang Teng Ma State Key Laboratory of Oil and Gas Geology and Exploitation Southwest Petroleum University Chengdu 610500 China School of Earth Sciences and Technology Branch of Sedimentology and Hydrocarbon Accumulation CNPC Key Laboratory of Carbonate Reservoir Southwest Petroleum University Chengdu 610500 China Department of Earth Sciences Nanjing University Nanjing 210023 China Institute of Petroleum Exploration and Exploitation PetroChina Southwest Oil and Gas Field Company Chengdu 610051 China

Karst in interbedded carbonates and evaporites has been reported to have important and complex impacts on reservoir. It is significant for exploration and karst geology. Here, we report such a new case from Middle Triassic Leikoupo Formation of Sichuan Basin, Southwest China. Stratigraphic incompleteness and the occurrence of unconformity provide evidence for the presence of eogenetic karst. Under the impact of this eogenetic karst, residual weathered and solution-collapse breccia, solution pores and silicification and dedolomitization have been observed. Classic stratigraphic zonation of karst is not readily distinguishable, which is ascribed to the stratigraphic collapse of carbonate rocks resulting from the dissolution of evaporites by lateral subsurface fluid flow. In terms of impact on reservoir quality, karst can generally improve the initial physical property of the porous layers in theory. However, subsurface fluid flow dissolved the evarporitic beds and facilitated the collapse of overlying strata. As a consequence, the lateral continuity of the reservoirs would be destroyed, and relatively high-quality reservoirs can only be developed with little collapse of overlying strata, reflecting reservoir heterogeneities. This may be a general feature of reservoir formation under the impact of karst in interbedded carbonates and evaporites.

关键词： karst carbonate reservoir evaporite Middle Triassic Leikoupo Formation Sichuan Basin

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The relative calibration of radial velocity for LAMOST medium resolution stellar spectra

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Research in Astronomy and Astrophysics 2021年第10期21卷 239-249页

作者： jian-Ping xiong Bo Zhang Chao liu Jiao Li Yong-Heng Zhao Yong-Hui Hou Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Astronomy Beijing Normal UniversityBeijing 100875China Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101 China Yunnan Observatories Chinese Academy of SciencesKunming 650011China Nanjing Institute of Astronomical Optics&Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST)started a medianresolution spectroscopic(MRS,R~7500)survey since October *** main scientific goals of MRS,including binary stars,pulsators and other variable stars,were launched with a time-domain spectroscopic ***,the systematic errors,including the bias induced from wavelength calibration and the systematic difference between different spectrographs,have to be carefully considered during radial velocity *** this work,we provide a technique to correct the systematics in the wavelength calibration based on the relative radial velocity measurements from LAMOST MRS *** show that,for the stars with multi-epoch spectra,the systematic bias which is induced from the exposures on different nights can be corrected well for LAMOST MRS in each *** addition,the precision of radial velocity zero-point of multi-epoch time-domain observations reaches below 0.5 km s^(-1).As a by-product,we also give the constant star candidates^(**),which can be the secondary radial-velocity standard star candidates of LAMOST MRS time-domain surveys.

关键词： methods:data analysis techniques:radial velocities stars:statistics catalogs surveys

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Effect of Nb on Microstructure and Mechanical Properties in Non-magnetic High Manganese Steel

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Journal of Iron and Steel Research International 2014年第6期21卷 600-605页

作者： Jia-li CAO Ai-min ZHAO Ji-xiong liu jian-guo HE Ran DING National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Baotai Group Co. Ltd.

Microstructure and mechanical properties of two kinds of non-magnetic high manganese steels with and without Nb addition which experienced the same rolling and heating treatment were investigated by means of scan ning electron microscopy, electron back-scattered diffraction, transmission electron microscopy, X-ray diffraction and tensile test. It was found that the microstructure of the high manganese steel was refined by the Nb addition. Moreover, steel with Nb addition has a higher stacking fault energy which favors the deformation twinning, Twin ning is the most important deformation mechanism in the Nb-bearing steel. Therefore, steel with Nb addition has much higher strength and higher plasticity. The product of tensile strength and total elongation exceeds 61.8 GPa ·%. In addition, steel with Nb addition also has excellent non magnetic property.

关键词： non-magnetic high manganese steel Nb addition rolling twinning mechanical property

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Effect of Y_(2)O_(3)doping on preparation ultrafine/nano-tungsten powder and refinement mechanism

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Tungsten 2023年第4期5卷 539-547页

作者： Dong-Dong Lv Yu Sun jian-Bo Zhang Sheng-Da Guo Bai-xiong liu Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China jiangxi Advanced Copper Industry Research Institute Yingtan335000China Naional Rare Earh Functional Material Innovation Center Jiangxi Universiy of Science and TechnologyGanzhou341000China Engineering Research Center of Tungsten Resources High-Efficiency Development and Application Technology of the Ministry of Education Jiangxi University of Science and TechnologyGanzhou341000China

In this study,ultrafine/nano W-Y_(2)O_(3)composite powders were synthesized by spray drying,roasting and two-step hydrogen reduction using ammonium metatungstate and yttrium nitrate as raw *** mechanism of the influence of Y_(2)O_(3)on the growth of WO_(2.72)and the particle refinement of tungsten powder is *** effect of Y_(2)O_(3)particles on the reduction behavior of tungsten powder was investigated using scanning electron microscopy to study the near surface morphology and X-ray diffraction for phase ID(composition)and crystal structural changes for the reduced powders at each *** results show that the doping of 0.3 wt.%Y_(2)O_(3)can significantly increase the aspect ratio of WO_(2.72)in the first step of hydrogen ***,Y_(2)O_(3)can effectively inhibit the growth of tungsten particles in the hydrogen reduction ***,The Y_(2)O_(3)-doped tungsten powders have finer particles and a narrower particle size distribution range than the undoped *** average particle diameter of 0.3 wt.%Y_(2)O_(3)doping tungsten powder was in the range of 90-120 nm.

关键词： Tungsten powder Hydrogen reduction Yttrium oxide

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电针疗法对慢性阻塞性肺疾病肌营养不良模型大鼠膈肌功能的调节机制

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广州中医药大学学报 2018年第2期35卷 265-271页

作者：陈建雄刘昌盛何颖李桂元孔祥翱童娟广州医科大学附属第一医院广东广州510120

【目的】观察电针疗法对慢性阻塞性肺疾病(COPD)肌营养不良模型大鼠膈肌功能的影响,探讨电针疗法对COPD大鼠呼吸功能的调节机制。【方法】将40只雄性SD大鼠随机分为空白组、模型组、单纯电针组、单纯运动组、电针加运动组,每组8只。成... 详细信息

【目的】观察电针疗法对慢性阻塞性肺疾病(COPD)肌营养不良模型大鼠膈肌功能的影响,探讨电针疗法对COPD大鼠呼吸功能的调节机制。【方法】将40只雄性SD大鼠随机分为空白组、模型组、单纯电针组、单纯运动组、电针加运动组,每组8只。成功复制COPD肌营养不良大鼠模型后,对各干预组大鼠进行电针和/或有氧训练等治疗。末次治疗后,观察各组大鼠体质量变化,检测大鼠肺功能,采用实时定量聚合酶链反应(q PCR)法检测大鼠膈肌组织肌球蛋白重链(MHC)-1、MHC-2 mRNA及膈肌相关信号蛋白Atrogin-1、Mu RF-1、MyoD mRNA表达量。【结果】与空白组比较,模型组吸气阻力(RI)、功能残气量(FRC)上升(P0.05)。与空白组比较,模型组MHC-1、Atrogin-1、Mu RF-1、MyoD mRNA表达水平明显升高(P0.05)。【结论】电针疗法能够提升COPD肌营养不良模型大鼠呼吸功能,其机制可能与增加膈肌MHC-2 mRNA表达,降低Atrogin-1、Mu RF-1、MyoD mRNA表达,从而干预泛素—蛋白酶体途径,减少肌球蛋白丢失,减轻膈肌萎缩有关。

关键词：电针疗法慢性阻塞性肺疾病肌营养不良膈肌基因表达调控疾病模型,动物大鼠

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Structural phase transition,strength,and texture in vanadium at high pressure under nonhydrostatic compression

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Chinese Physics B 2018年第3期27卷 335-341页

作者： Lun xiong Jing liu School of Intelligent Manufacturing Sichuan University of Arts and ScienceDazhou 635000China DaZhou Industrial Technology Institute of Intelligent Manufacturing Dazhou 635000China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

The structural phase transition,strength,and texture of vanadium have been studied under nonhydrostatic compression up to 70 GPa using an angle-dispersive radial x-ray diffraction technique in a 2-fold paranomic diamond anvil cell and up to 38 GPa using an angle-dispersive x-ray diffraction technique in a modified Mao-Bell diamond anvil cell at room *** have confirmed a phase transition from body-centered cubic structure to rhombohedral structure at 27-32 GPa under nonhydrostatic *** radial x-ray diffraction data yields a bulk modulus K_(0)=141(5)GPa and its pressure derivative K_(0)'=5.4(7)for the bcc phase and K_(0)=154(13)GPa with K_(0)′=3.8(3)for the rhombohedral phase atψ=54.7°.The nonhydrostatic x-ray diffraction data of both bcc and rhombohedral phases yields a bulk modulus K_(0)=188(5)GPa with K_(0)′=2.1(3).Combined with the independent constraints on the high-pressure shear modulus,it is found that the vanadium sample can support a differential stress of-1.6 GPa when it starts to yield with plastic deformation at-36 GPa.A maximum differential stress as high as-1.7 GPa can be supported by vanadium at the pressure of-47 *** addition,we have investigated the texture up to 70 GPa using the software package *** is convinced that the body-centered cubic to rhombohedral phase transition and plastic deformation due to stress under high pressures are responsible for the development of texture.

关键词： phase transition strength texture vanadium

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Exploratory study of logistics service quality scale based on online shopping malls

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第6期8卷 926-931页

作者： FENG Yi-xiong ZHENG Bing TAN jian-rong State Key Lab. of CAD ＆ CG Zhejiang University Hangzhou 310027 China College of Economics ＆ Management Dalian University Dalian 116622 China

Online shopping has already become the new mode that a lot of customers try to adopt. At the same time, the online shopping could not be successfully completed without logistics service. Logistics service quality (LSQ) has significant impact on revenue and profitability. This paper presents the issue from the perspective of the customer, and explores the initial factors of LSQ based on the online shopping through in-depth interview and the Delphi method. The survey uses a standard 7-point Likert-type scale to measure the LSQ. Empirical research results are shown in detail to confirm seven LSQ dimensions with Chinese characteristics, including timeliness quality, personal contact quality, order quality, order discrepancy handling, order condition and convenience. Statistical analyses of the investigation were conducted to test the reliability and validity of the LSQ evaluation model.

关键词： Online shopping Logistics service Logistics service quality (LSQ) Dimensions of LSQ

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Experimental study on hydration damage mechanism of shale from the Longmaxi Formation in southern Sichuan Basin, China

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Petroleum 2016年第1期2卷 54-60页

作者： Xiangjun liu Wei Zeng Lixi Liang jian xiong State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China

As a serious problem in drilling operation,wellbore instability restricts efficient development of shale *** interaction between the drilling fluid and shale with hydration swelling property would have impact on the generation and propagation mechanism of cracks in shale formation,leading to wellbore *** order to investigate the influence of the hydration swelling on the crack propagation,mineral components and physicochemical properties of shale from the Lower Silurian Longmaxi Formation(LF)were investigated by using the XRD analysis,cation exchange capabilities(CEC)analysis,and SEM observation,and we researched the hydration mechanism of LF *** show that quartz and clay mineral are dominated in mineral composition,and illite content averaged 67%in clay ***,CEC of the LF shale are 94.4 mmol/*** process of water intruding inside shale along microcracks was able to be observed through high power microscope,meanwhile,the hydration swelling stress would concentrate at the crack *** microcracks would propagate,bifurcate and connect with each other,with increase of water immersing time,and it would ultimately develop into ***,the macrocracks extend and coalesce along the bedding,resulting in the rock failure into *** swelling is one of the major causes that lead to wellbore instability of the LF shale,and therefore improving sealing capacity and inhibition of drilling fluid system is an effective measure to stabilize a borehole.

关键词： Longmaxi Formation shale Hydration Rock failure Physical and chemical properties Micro structure

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Modeling and Stability Issues of Voltage-source Converter-dominated Power Systems:A Review

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1530-1549页

作者： Liansong xiong Xiaokang liu Yonghui liu Fang Zhuo School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Electronics Information and BioengineeringPolitecnico di Milano20133 MilanoItaly

With the substantive increase in the proportion of voltage-source converter(VSC)-based equipment,traditional power systems that primarily constituted of synchronous generators(SGs)gradually evolved into VSC-dominated *** the same time,there is an urgent need for modeling and stability assessment of such systems,since low inertia and weak damping features impair the ability of the systems to resist random *** works model the system dynamic processes from various domains(i.e.,time,frequency and energy),and analyze/determine the system stability under small or large *** them,small-signal stability assessments mainly adopt the time-domain analysis based on the state-space model while frequency-domain methods include the impedance model,phase-amplitude dynamics model,and static synchronous generator ***-signal stability assessments mainly exploit the time-domain simulation with detailed models(i.e.,continuous/discrete-time mixed model with differentialdifference-algebraic equations),and the energy-domain analysis is based on energy function *** paper presents a comprehensive review of existing modeling and stability analysis methods for VSC-dominated power systems,including their basic principles,key features,application scenarios and development *** technical issues related to modeling and stability analysis are also summarized.

关键词： Dynamic modeling power system stability analysis voltage-source converter(VSC)

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Improved Mechanical Properties of Poly(butylene succinate) Membrane by Co-electrospinning with Gelatin

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Chinese Journal of Polymer Science 2018年第9期36卷 1063-1069页

作者： Lu Chen Hui-Hui Cheng jiang xiong Ya-Ting Zhu Hong-Peng Zhang Xi xiong Yu-Man liu jian Yu Zhao-Xia Guo Key Laboratory of Advanced Materials (Ministry of Education) Department of Chemical Engineering Tsinghua University Department of Vascular and Endovascular Surgery Chinese PLA General Hospital

Gelatin, a natural proteinous polymer, was used to co-electrospin with poly（butylene succinate）（PBS） in order to improve the mechanical properties of PBS membrane and facilitate its applications in biomedical field. The PBS/gelatin blend membranes have narrower distribution of fiber diameter and smoother surface than neat PBS membrane. The contact angles, water absorption rates and water uptakes of the PBS/gelatin blend membranes were measured, showing increased hydrophilicity. The interaction between PBS and gelatin was investigated by attenuated total reflectance Fourier transform infrared spectroscopy （ATR-FTIR） and differential scanning calorimetry （DSC）. The mechanical properties of PBS/gelatin blend membranes in both dry and wet states were evaluated by uniaxial tensile tests. In the dry state, the PBS/gelatin blend membrane containing 10% gelatin has a 3-times increase in tensile strength without any adverse effect on ductility because of the existence of interaction between the two blend components, little change in crystallinity of PBS, and possible interaction between any adjacent fibers; the tensile strength and elongation at break are even better in the wet state attributed to some gelatin on fiber surfaces, which act as a binder in the presence of water. The potential applications of PBS/gelatin blend membranes were demonstrated by successful immobilization of thrombin, a clinically-used hemostatic drug. The thrombin-loaded membrane could be used for rapid hemostasis.

关键词： PBS Gelatin Electrospinning Mechanical properties Blending

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