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Water-bearing characteristics and their effects on the nanopores of overmature coal-measure shales in the Wuxiang area of the Qinshui Basin, north China

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Frontiers of Earth Science 2023年第1期17卷 273-292页

作者： Peng CHENG Xianming XIAO Hui TIAN Jian SUN Qizhang FAN haifeng gai Tengfei LI State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China

In this study,a group of overmature coal-measure shale core samples was collected in situ from an exploration well located in the Wuxiang area of the Qinshui Basin,north *** pore water contents(CPW)of the shales under as-received conditions,equilibrium water contents(CEW)of the shales under moisture equilibrium conditions(relative humidity:100%),and nanopore structures of the shales under both as-received and dried conditions were *** results indicate that the CPW values of these shales are much lower than their CEW values,which implies that the bulk pore systems of these shales have low water-bearing *** addition,approximately half of the total pore volumes and surface areas of the as-received shales are occupied by pore water,and the effects of pore water on shale nanopores with various pore types and widths are *** average water-occupied percentages(PW)are 59.16%−81.99%and 42.53%−43.44%for the non-micropores and micropores,respectively,and are 83.54%−97.69%and 19.57%−26.42%for the inorganic-matter hosted(IM)and organic-matter hosted(OM)pores,*** pore water in shales not only significantly reduces the storage of shale gas by occupying many pore spaces,but also causes the shale gas,especially the absorbed gas,to be mostly stored in the OM pores;meanwhile,the IM pores mainly store free ***,the water-bearing characteristics and their effects on the pore structures and gas-bearing properties of coal-measure shales should be noted for the evaluation and exploration of shale gas in the Qinshui Basin.

关键词： coal-measure shales water-bearing characteristics nanopore structures shale gas the Qinshui Basin

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Gas-in-Place(GIP) Variation and Main Controlling Factors for the Deep Wufeng-Longmaxi Shales in the Luzhou Area of the Southern Sichuan Basin,China

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Journal of Earth Science 2023年第4期34卷 1002-1011页

作者： Wei Wu Peng Cheng Shenyang Liu Chao Luo haifeng gai Haitao Gao Qin Zhou Tengfei Li Kesu Zhong Hui Tian Research Institute of Shale gas PetroChina Southwest Oil and Gas FieldsChengdu 610002China State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China

The Wufeng-Longmaxi Formation shales with burial depths > 3 500 m in the southern Sichuan Basin are believed to have large shale gas ***,the reservoir properties and gasin-place(GIP) contents of these shales exhibit variations across different *** this study,a set of Wufeng-Longmaxi shales with burial depths of 4 000–4 200 m was derived from the Well Y101H2 in the Luzhou area,and the differences in geological and geochemical characteristics,porosity,water saturation and GIP content of various sublayer shales were *** results indicate that the TOC content and effective porosity of the upper(LMX1-4) and lower(LMX1-3) sublayer shales of the first member of the Longmaxi Formation are better than those of the Wufeng Formation(WF) shales,which results in the LMX1-4 and LMX1-3 shales having higher GIP contents than the WF *** GIP contents of the LMX1-3 shales are higher than those of the LMX1-4 shales,and this is likely because the organic matter of the LMX1-3 shales had more aquatic organisms and was preserved in a stronger reductive environment,which leads to a stronger gas generation *** contrast to the middle-shallow LMX1-4 shales in the Sichuan Basin,the deep LMX1-4 shales in the Luzhou area have advantageous reservoir properties and GIP contents,and thus it is promising to synchronously exploit the deep LMX1-4 and LMX1-3 shales in some regions of the southern Sichuan Basin.

关键词： the Sichuan Basin Wufeng-Longmaxi Formation shales deep shales reservoir proper-ties GIPcontents.

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Evolution and Governance of the Structure of Marine Economic Networks in China’s Coastal Areas: Based on Sea-related A-share Listed Companies

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Chinese Geographical Science 2024年第5期34卷 899-916页

作者： LI Bo CAO gai Key Research Base of Humanities and Social Sciences of Ministry of Education Institute of Marine Sustainable DevelopmentLiaoning Normal UniversityDalian 116029China School of Maritime Economics and Management Dalian Maritime UniversityDalian 116026China

Data on discrete,isolated attributes of the marine economy are often used in traditional marine economic ***,as the focus of urban research shifts from internal static attributes to external dynamic linkages,the importance of marine economic net-work research is beginning to *** construction of the marine economic network in China’s coastal areas is necessary to change the flow of land and sea resources and optimize regional marine economic *** data from headquarters and branches of sea-related A-share listed enterprises to construct the marine economic network in China,we use social network analysis(SNA)to discuss the characteristics of its evolution as of 2010,2015,and 2020 and its *** following results were obtained.1)In terms of topological characteristics,the scale of the marine economic network in China’s coastal areas has accelerated and expan-ded,and the connections have become increasingly close;thus,this development has complex network characteristics.2)In terms of spatial structure,the intensity of the connection fluctuates and does not form stable development support;the group structure gradually becomes clear,but the overall pattern is fragmented;there are spatial differences in marine economic agglomeration radiation;the radi-ation effect of the eastern marine economic circle is obvious;and the polarization effect of northern and southern marine economic circles is *** this basis,we construct a framework for the governance of a marine economic network with the market,the government,and industry as the three governing *** clarifying the driving factors and building objectives of marine economic network construction,this study aims to foster the high-quality development of China’s marine economy.

关键词： marine economic network sea-related A-share listed companies social network analysis(SNA) network governance China’s coastal areas

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Single Photon Detection Technology in Underwater Wireless Optical Communication:Modulation Modes and Error Correction Coding Analysis

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Journal of Ocean University of China 2024年第2期23卷 405-414页

作者： gai Lei LI Wendong WANG Guoyu Faculty of Information Science and Engineering Ocean University of ChinaQingdao 266100China

This study explores the application of single photon detection(SPD)technology in underwater wireless optical communication(UWOC)and analyzes the influence of different modulation modes and error correction coding types on communication *** study investigates the impact of on-off keying(OOK)and 2-pulse-position modulation(2-PPM)on the bit error rate(BER)in single-channel intensity and polarization ***,it compares the error correction performance of low-density parity check(LDPC)and Reed-Solomon(RS)codes across different error correction coding *** effects of unscattered photon ratio and depolarization ratio on BER are also ***,a UWOC system based on SPD is constructed,achieving 14.58 Mbps with polarization OOK multiplexing modulation and 4.37 Mbps with polarization 2-PPM multiplexing modulation using LDPC code error correction.

关键词： error correction coding modulation mode single photon detection underwater communication wireless optical communication

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川西北地区中泥盆统腐泥型烃源岩晚期生气特征实验研究

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石油与天然气地质 2023年第1期44卷 46-54页

作者：田辉吴子瑾盖海峰王星中国科学院广州地球化学研究所有机地球化学国家重点实验室广东广州 510640 中国科学院深地科学卓越创新中心广东广州 510640 中国科学院广州地球化学研究所有机地球化学国家重点实验室广东广州 510640

中国南方古生界烃源岩的原始干酪根类型以腐泥型-偏腐泥型(Ⅰ-Ⅱ型)为主,目前主体处于过成熟阶段(镜质体反射率Ro>2.0％),准确评价Ⅰ-Ⅱ型干酪根在生-排油之后的生气潜力(或晚期生气)及生气特征对中国南方古生界深层-超深层天然气勘探... 详细信息

中国南方古生界烃源岩的原始干酪根类型以腐泥型-偏腐泥型(Ⅰ-Ⅱ型)为主,目前主体处于过成熟阶段(镜质体反射率Ro>2.0％),准确评价Ⅰ-Ⅱ型干酪根在生-排油之后的生气潜力(或晚期生气)及生气特征对中国南方古生界深层-超深层天然气勘探至关重要.鉴于此,以川西北地区中泥盆统观雾山组样品(Ro≈1.1％)为例,通过黄金管生烃模拟实验,结合已有文献资料,探讨了Ⅰ-Ⅱ型干酪根在高-过成熟阶段的生气潜力及气体地球化学特征.结果表明,研究样品残留油含量(按单位有机碳质量计算,以下同)为140 mg/g,现今生气潜力为220 mL/g,显示仍具有较好的生气潜力.其中,干酪根裂解气的贡献至少为140 mL/g,残留油裂解气最多为80 mL/g,表明腐泥型烃源岩在排油效率较高时,其晚期生气以干酪根裂解气为主.同时,排油之后的腐泥型烃源岩晚期生成的天然气干燥系数较高,随着甲烷产率的增加甲烷碳同位素快速变重,在成熟度达到Ro≈3.5％时,其甲烷碳同位素值与母质干酪根碳同位素值接近(碳同位素分馏程度约为0.5‰).上述结果可为中国南方古生界深层-超深层天然气的资源潜力评价和天然气来源识别等研究提供有益的科学依据.

关键词：干酪根裂解气甲烷碳同位素腐泥型烃源岩晚期生气深层天然气中泥盆统川西北地区

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A Bio-inspired Mutual-hook Strategy for the Soft Finger to Improve Load-bearing Capacity and Grasping Stability

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Journal of Bionic Engineering 2024年第3期21卷 1290-1304页

作者： Jie Huang Lingjie gai Xiaofeng Zong Yunquan Li School of Automation China University of GeosciencesWuhan430074China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex System Wuhan430074China The Shien-Ming Wu School of Intelligent Engineering South China University of TechnologyGuangzhou510641China

Soft grippers have great potential applications in daily life,since they can compliantly grasp soft and delicate ***,the highly elastic fingers of most soft grippers are prone to separate from each other while grasping objects due to their low stiffness,thus reducing the grasping stability and load-bearing *** tackle this problem,inspired from the venus flytrap plant,this work proposes a mutual-hook mechanism to restrain the separation and improve the grasping performance of soft *** novel soft gripper design consists of three modules,a soft finger-cot,two Soft Hook Actuators(SHAs)and two sliding ***,the soft finger-cot covers on the soft finger,increasing the contact area with the target object,two SHAs are fixed to the left and right sides of the finger-cot,and the sliding mechanisms are designed to make SHAs stretch *** demonstrate that the proposed design can restrain the separation of soft fingers substantially,and the soft fingers with the finger-cots can grasp objects three times heavier than the soft fingers without the proposed *** proposed design can provide invaluable insights for soft fingers to restrain the separation while grasping,thus improving the grasping stability and the load-bearing capacity.

关键词： Soft robotics Soft bionic finger-cot Soft hook actuator Grasping stability Load-bearing capacity

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Extending homogeneous fluidization flow regime of Geldart-A particles by exerting axial uniform and steady magnetic field

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Chinese Journal of Chemical Engineering 2024年第1期65卷 169-177页

作者： Qiang Zhang Wankun Liu Hengjun gai Quanhong Zhu College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China School of Chemical&Environmental Engineering China University of Mining&Technology-BeijingBeijing 100083China

The homogeneous/particulate fluidization flow regime is particularly suitable for handling the various gas–solid contact processes encountered in the chemical and energy *** work aimed to extend such a regime of Geldart-A particles by exerting the axial uniform and steady magnetic *** the action of the magnetic field,the overall homogeneous fluidization regime of Geldart-A magnetizable particles became composed of two parts:inherent homogeneous fluidization and newly-created magnetic *** the former remained almost unchanged whereas the latter became broader as the magnetic field intensity increased,the overall homogeneous fluidization regime could be extended *** for Geldart-A nonmagnetizable particles,certain amount of magnetizable particles had to be premixed to transmit the magnetic *** others,the mere addition of magnetizable particles could broaden the homogeneous fluidization *** added content of magnetizable particles had an optimal value with smaller/lighter ones working *** added magnetizable particles might raise the ratio between the interparticle force and the particle *** the magnetic field was exerted,the homogeneous fluidization regime was further expanded due to the formation of magnetic stabilization flow *** more the added magnetizable particles,the better the magnetic performance and the broader the overall homogeneous fluidization ***/lighter magnetizable particles were preferred to maximize the magnetic performance and extend the overall homogeneous fluidization *** phenomenon could be ascribed to that the added magnetizable particles themselves became more Geldart-A than-B type as their density or size decreased.

关键词： Fluidized-bed Fluidization Geldart-A particles Flow regimes Extend Magnetic stabilization

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Novel Hf_(x)Ta_(1−x)C solid solution nanowire toughened HfC coating:An effective strategy for synchronous enhanced mechanical and anti-ablation performance

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Journal of Advanced Ceramics 2024年第5期13卷 590-601页

作者： Hui Chen Yulei Zhang Yanqin Fu Wenhan gai Junhao Zhao Haohui Zhang Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials Northwestern Polytechnical UniversityXi’an 710072China Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites Institute of Carbon Matrix CompositesHenan Academy of SciencesZhengzhou 450046China

Ultra-high-temperature ceramic nanowires have shown increasing potential for use as thermal structural ***,novel single-crystal Hf_(0.5)Ta_(0.5)C solid solution nanowires were synthesized and incorporated with a HfC coating to construct a robust structure with Hf_(0.5)Ta_(0.5)C solid solution nanowires uniformly distributed and interconnected within the *** novel Hf_(0.5)Ta_(0.5)C solid solution nanowires could effectively hinder crack propagation through crack tip pinning and crack *** mechanism substantially enhanced the elastic modulus and fracture toughness of the HfC coating by 53.29%and 59.67%,*** toughened HfC coating displayed superior fracture toughness and good interfacial binding strength with the substrate to resist severe oxidation and ***,the high thermal conductivity of the toughened HfC coating promoted heat ***,in comparison to the pure HfC coating,the toughened HfC coating displayed smaller mass and linear ablation rates of−0.35 mg·s^(−1)and−0.46μm·s^(−1),which decreased by 39.66%and 36.98%,*** work not only simultaneously enhances the mechanical properties and ablation resistance of HfC-coated carbon/carbon(C/C)composites but also provides novel prospects for advanced ultrahigh-temperature ceramic nanowires under extreme conditions.

关键词： Hf_(x)Ta_(1−x)C solid solution nanowires HfC coating carbon/carbon(C/C)composites mechanical performance ablationresistance

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单井开发成本的模糊数综合评定方法

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价值工程 2012年第14期31卷 101-103页

作者：盖海峰胜利油田东胜精攻石油开发集团股份有限公司东营257000

为了解决单井开发成本综合评议过程中多专家评议意见融合的问题,提出了一种基于模糊数的多专家评议意见融合方法,首先介绍了专家评议信息的模糊数表示方法以及专家评议信息之间的差异性测度的表示方法,最后给出了多专家意见的信息融合方... 详细信息

为了解决单井开发成本综合评议过程中多专家评议意见融合的问题,提出了一种基于模糊数的多专家评议意见融合方法,首先介绍了专家评议信息的模糊数表示方法以及专家评议信息之间的差异性测度的表示方法,最后给出了多专家意见的信息融合方法,最后利用数值算例论述了本方法的可行性。

关键词：单井开发成本信息融合模糊数

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Design and construction of charged-particle telescope array for study of exotic nuclear clustering structure

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Nuclear Science and Techniques 2024年第8期35卷 114-123页

作者： Zheng‑Li Liao Xi‑Guang Cao Yu‑Xuan Yang Chang‑Bo Fu Xian‑gai Deng Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Zhengzhou University Zhengzhou 450001China Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan University Shanghai 200438China

The exploration of exotic shapes and properties of atomic nuclei,e.g.,αcluster and toroidal shape,is a fascinating field in nuclear *** study the decay of these nuclei,a novel detector aimed at detecting multipleα-particle events was designed and *** detector comprises two layers of double-sided silicon strip detectors(DSSD)and a cesium iodide scintillator array coupled with silicon photomultipliers array as light sensors,which has the advantages of their small size,fast response,and large dynamic *** coupled with cesium iodide crystal arrays are used to distinguish multipleα*** detector array has a compact and integrated design that can be adapted to different experimental *** detector array was simulated using Geant4,and the excitation energy spectra of someα-clustering nuclei were reconstructed to demonstrate the *** simulation results show that the detector array has excellent angular and energy resolutions,enabling effective reconstruction of the nuclear excited state by multipleαparticle *** detector offers a new and powerful tool for nuclear physics experiments and has the potential to discover interesting physical phenomena related to exotic nuclear structures and their decay mechanisms.

关键词： Cluster decay Toroidal structure Telescope array SiPM Energy resolution

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