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Rheological study of methane gas hydrates in the presence of micron-sized sand particles

Chinese Journal of Chemical Engineering 2024年第6期70卷 149-161页

作者： Bohui Shi Shangfei Song yuchuan chen Shunkang Fu Lihao Liu Xinyao Yang Haihao Wu Guangjin chen Jing Gong National Engineering Research Center of Oil and Gas Pipeline Transportation Safety MOE Key Laboratory of Petroleum EngineeringBeijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of Petroleum-BeijingBeijing 102249China China's Oil and Gas Exploration and Development Company(CNODC) Beijing 100034China China National Petroleum Corporation Mozambique LDA MaputoMozambique PipeChina West East Pipeline Company Shanghai 200122China

Natural gas hydrates,intricate crystalline structures formed by water molecules and small gas molecules,have emerged as a significant and globally impactful clean energy ***,their commercial exploitation faces challenges,particularly operational disruptions caused by sand-related *** the rheological properties of hydrate slurry,especially in the presence of micron-sized sand particles,is imperative for ensuring the flow assurance of subsea hydrate *** study extensively investigates the rheological properties of sand-containing hydrate *** findings reveal that these slurries exhibit non-Newtonian fluid characteristics,including yield stress,thixotropy,and shear-thinning ***-like elastic features are observed in sand-containing hydrate slurries before yielding,transitioning to viscous behavior after *** with a minimal amount of sand,both static yield stress and yield strain experience substantial changes,correlating with the increase in sand *** research conclusively establishes the thixotropic nature of sand-hydrate slurries,where the viscosity decay rate is directly influenced by the shear *** insights aim to contribute comprehensively to the development of effective flow assurance strategies,ensuring the safe and stable operation of subsea hydrate exploitation.

关键词： Natural gas hydrate production Sand-containing hydrate slurries Yield stress Thixotropy Shear-thinning behavior

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拉曼光谱技术在微生物细胞代谢动态研究中的应用进展

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中国酿造 2024年第7期43卷 21-26页

作者：陈屿川覃丽垚姜明国吴仁智广西民族大学海洋与生物技术学院广西多糖材料与改性重点实验室广西南宁530008 广西科学院非粮生物质能技术全国重点实验室国家非粮生物质能源工程技术研究中心广西南宁530007

拉曼光谱是一种基于拉曼散射的光谱分析技术,具有高效率、非接触和实时性的优点,常用于微生物学研究中的微生物细胞生理生化分析。该文简单介绍了拉曼光谱在微生物细胞分析中的优势,主要总结了其在真菌(酵母、动植物病原真菌)、细菌(产... 详细信息

拉曼光谱是一种基于拉曼散射的光谱分析技术,具有高效率、非接触和实时性的优点,常用于微生物学研究中的微生物细胞生理生化分析。该文简单介绍了拉曼光谱在微生物细胞分析中的优势,主要总结了其在真菌(酵母、动植物病原真菌)、细菌(产芽孢细菌、病原细菌)和微藻细胞研究中的应用,并展望了拉曼光谱分析技术未来的发展方向。为深入开发利用微生物资源和微生物快速分类鉴定及选育等提供新的思路。

关键词：拉曼光谱光谱分析微生物细胞生物学病原微生物

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Environmental, social, and governance performance and corporate innovation novelty

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International Journal of Innovation Studies 2024年第2期8卷 109-131页

作者： Wanyi chen yuchuan Xie Kang He SILC Business School Shanghai UniversityShanghai200444China School of Economics Huazhong University of Science and TechnologyWuhan430074China School of Business Shantou UniversityShantou515063China

Environmental,social,and governance(ESG)performance,along with the novelty of innovation,are significant factors in promoting sustainable development for *** study employs the Heckman two-stage model to examine the impact of ESG performance on innovation novelty using a dataset comprising A-share listed companies in the Shanghai and Shenzhen Stock Ex-changes from 2011 to *** results indicate that enhanced ESG performance significantly fosters innovation by expanding innovation resources and mitigating agency *** analysis reveals that this relationship is more pronounced under high economic policy uncer-tainty,a challenging information environment,elevated financing constraints,and in the context of digital *** study not only expands the research on the economic implications of ESG performance for enterprise innovation behavior but also places a distinct emphasis on innovation quality rather than ***,this study enriches the existing literature on the factors influencing innovation novelty and extends research into the link between envi-ronmental protection and firm innovation,particularly from the perspective of stakeholder ***,this study holds practical significance for governments aiming to enhance ESG evaluation systems and establish guiding policies that encourage novel innovations,ultimately contributing to sustainable and high-quality ***,this study provides guidance to enterprises by encouraging them to embrace green development,improve social responsibility,and elevate their governance standards to promote innovation quality.

关键词： ESG Innovation novelty Resource dependence theory Agency problem Innovation quality Sustainable development

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On Minerogenetic Series: The Third Discussion

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Acta Geologica Sinica(English Edition) 2020年第1期94卷 1-9页

作者： chen yuchuan PEI Rongfu WANG Denghong MNR Key Laboratory of Metallogeny and Mineral Assessment Chinese Academy of Geological SciencesBeijing 100037China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China

The minerogenetic(or metallogenetic) series of mineral deposits(called minerogenetic series for short) is an academic idea(concept) of studying minerogenetic characteristics in mineral deposit geology. It uses the views of systematology and mobilism to study mineralizing processes and naturally occurring mineral deposit assemblages formed in various stages of geological development in specific tectonic environments. The minerogenetic series is also a natural classification of mineral deposits. There are five hierarchical orders in the classification, with the minerogenetic series as the basic order and the core. The first order includes three categories: minerogenetic series association, minerogenetic series type, and minerogenetic series group. The second is the minerogenetic series, which is decomposed into three orders, i.e. the third, fourth, and fifth orders. The third is the minerogenetic subseries, the fourth is mineral deposit models(types), and the fifth is mineral deposits. Minerogenetic series is comparable to a certain extent metallogenic systems both in the research content and in their own research content. The study of minerogenetic series has both great theoretical significance and practical value for mineral prospecting. However, the study is still in its initial stage and a further study remains to be conducted.

关键词： concept of minerogenetic series order theoretic and practicable significance

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The Ore-forming Mechanism of the Jiajika Pegmatite-Type Rare Metal Deposit in Western Sichuan Province:Evidence from Isotope Dating

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Acta Geologica Sinica(English Edition) 2013年第1期87卷 91-101页

作者： LI Jiankang WANG Denghong chen yuchuan MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResoucesCAGS Colleage of Earth Science and Resources Chang'an University

Granitic pegmatites are commonly thought to form by fractional crystallization or by liquid immiscibility of granitic magma; however, these proposals are based mainly on analyses of fluid and melt inclusions. Here, we use the Jiajika pegmatite deposit, the largest spodumene deposit in Asia, as a case study to investigate ore forming processes using isotope dating. Dating of a single granite sample from the Jiajika deposit using multiple methods gave a zircon U-Pb SHRIMP age of 208.4 ~ 3.9 Ma, an 4~Ar/39Ar age for muscovite of 182.9 ~ 1.7 Ma, and an 4~Ar/39Ar age for biotite of 169.9 ＋ 1.6 Ma. Based on these dating results and the 4~Ar/39Ar age of muscovite from the Jiajika pegmatite, a temperature-time cooling track for the Jiajika granite was constructed using closure temperatures of the different isotope systems. This track indicates that the granite cooled over ^-40 m. y., with segregation of the pegmatite fluid from the granitic magma at a temperature of ~700~C. This result suggests that the Jiajika pegmatite formed not by fractional crystallization, but by segregation of an immiscible liquid from the granitic magma. When compared with fractional crystallization, the relatively early timing of segregation of an immiscible liquid from a granitic magma can prevent the precipitation of ore-forming elements during crystallization, and suggests that liquid immiscibility could be an important ore-forming process for rare metal pegmatities. We also conclude that isotope dating is a method that can potentially be used to determine the dominant ore-forming processes that occurred during the formation of granite-related ore deposits, and suggest that this method can be employed to determine the formation history of the W-Sn ore deposits found elsewhere within the Nanling Metallogenic Belt.

关键词： isotope dating liquid immiscibility in granitic magmas pegmatite Jiajika rare metal deposit

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Research progress on ultra-precision machining technologies for soft-brittle crystal materials

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Frontiers of Mechanical Engineering 2017年第1期12卷 77-88页

作者： Hang GAO Xu WANG Dongming GUO yuchuan chen Key Laboratory for Precision and Non-traditional Machining Technol-ogy of Ministry of Education Dalian University of Technology Dalian116024 China

Soft-brittle crystal materials are widely used in many fields, especially optics and microelectronics. However, these materials are difficult to machine through traditional machining methods because of their brittle, soft, and anisotropic nature. In this article, the characteristics and machining diff^culties of soft-brittle and crystals are presented. Moreover, the latest research progress of novel machining technologies and their applications for soft- brittle crystals are introduced by using some representative materials （e.g., potassium dihydrogen phosphate （KDP）, cadmium zinc telluride （CZT）） as examples. This article reviews the research progress of soft-brittle crystals processing.

关键词： brittle soft functional crystal ultra-precisionmachining

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Investigation on the cleaning of KDP ultra-precision surface polished with micro water dissolution machining principle

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Science China(Technological Sciences) 2017年第1期60卷 27-35页

作者： chen yuchuan GAO Hang WANG Xu GUO DongMing TENG XiaoJi Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education School of Mechanical Engineering Dalian University of Technology Dalian 116023 China

A potassium dihydrogen phosphate(KDP) optical crystal was machined to an ultra-precision surface with water-in-oil(W/O) micro emulsion polishing fluid. The micro water dissolution principle utilized in the machining process is discussed, its planarization mechanism is illustrated, and an ultra-precision polished surface with 2.205 nm RMS roughness is obtained. However, a substantial quantity of residual contamination remained on the polished surface after machining. This can seriously impact the optical performance of the crystal, and so it must be removed. Fourier transform infrared(FTIR) spectroscopy was used to conduct an investigation into the composition of the surface residue, and the results showed that the residue was comprised of organic chemicals with hydrocarbon chains and aromatic ether, i.e., mostly the polishing fluid. The cleaning method and the principle on which the KDP ultra precision surface investigation is based are discussed in detail, and the cleaning experiments with selected KDP-compatible organic solvents were then performed. FTIR transmittance spectra measurement and microscopic observations were employed to assess the effects of the cleaning process on the surface of the KDP crystal. The results showed that toluene cleaning achieved the most desirable results. This cleaning method produced a surface roughness of 1.826 nm RMS, which allows the KDP crystal to be applied to subsequent engineering applications.

关键词： KDP晶体清洗方法超精密抛光加工原理抛光表面水溶解傅里叶变换红外光谱表面粗糙度

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Timming of Lithospheric Extension in Northeastern China:Evidence from the Late Mesozoic Nianzishan A-Type Granitoid Complex

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Journal of Earth Science 2019年第4期30卷 689-706页

作者： Jinhua Qin Cui Liu yuchuan chen Jinfu Deng MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

New zircon U-Pb dates obtained by laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS),whole-rock geochemical data and Sm-Nd and Rb-Sr isotopic data are presented for miarolitic alkaline granites,porphyritic syenite and rhyolites of the Nianzishan A-Type granitoid complex(NAGC)in the Great Xing'an Range-Songliao Basin in Northeast(NE)*** crystallization ages of 112.95±0.93 and 114.1±1.71 Ma for granite and 118.6±0.51 Ma for porphyritic syenite were determined by high-precision *** εNd(t)of the rocks range from +1.85 to+2.06,with Nd model ages(T(DM1))from 671 to 821 Ma,indicating that the NAGC originated from juvenile source rocks and exhibits geochemical characteristics of A1-and A-Type granite which formed in an extensional *** attribute the magmatism to regional extension and lithospheric thinning caused by the subduction of the western Pacific Plate about 120 to 100 Ma.

关键词： A-Type granitee new zircon UU-Pb zircon agees NE China lithospheric exxtension

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水合物阻聚剂研究进展

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石油科学通报 2024年第2期9卷 318-337页

作者：付顺康王智卫国锋梁璇玑陈玉川张烜玮姚海元许保珅宋尚飞史博会吴海浩宫敬天然气水合物国家重点实验室北京102249 中国石油大学(北京)油气管道输送安全国家工程实验室/石油工程教育部重点实验室/城市油气输配技术北京市重点实验室北京102249 国家石油天然气管网集团有限公司西气东输分公司上海710018 长庆工程设计有限公司西安710018 中国石油国际勘探开发有限公司北京100034 中国石油塔里木油田公司博大油气开发部阿克苏842300 中海油研究总院有限责任公司北京100028

相较于传统的水合物生成抑制方式,向管线中添加低剂量抑制剂的水合物风险控制策略,在深水多相集输领域防控水合物堵塞中具有显著的优势,备受国内外学术与工业界的青睐。阻聚剂是一种能在更为苛刻的高过冷度工况下,仍具有良好阻聚效果的... 详细信息

相较于传统的水合物生成抑制方式,向管线中添加低剂量抑制剂的水合物风险控制策略,在深水多相集输领域防控水合物堵塞中具有显著的优势,备受国内外学术与工业界的青睐。阻聚剂是一种能在更为苛刻的高过冷度工况下,仍具有良好阻聚效果的低剂量抑制剂,可保证多相混输流体内生成的水合物以浆液呈现可输送状态。本文重点阐述了影响阻聚剂性能的关键因素,梳理了阻聚剂存在体系内水合物生成及流动的宏微观特性。总体而言,阻聚剂的性能受加剂量、含水率、矿化度、pH、溶液乳化状态及应用工况过冷度等综合因素的影响;添加阻聚剂体系的水合物浆液内水合物生成量稳定适中、流动性越好,油气水混输系统内发生水合物堵塞的风险越低,其流动安全的保障可靠性越高。基于上述研究,本文总结了阻聚剂对水合物的作用机理,并给出了未来深入开展阻聚剂研究的建议。

关键词：水合物阻聚剂乳化吸附

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Time Sequence of Himalayan Endogenetic Mineralization on the East Side of the Qinghai-Tibet Plateau

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Acta Geologica Sinica(English Edition) 2000年第3期74卷 447-451页

作者： LUO Junlie chen yuchuan WANG Denghong Yunnan Bureau of Geology and Mineral Exploration and Development Kunming 650011Yunnan Chinese Academy of Geological Sciences(CAGS) Beijing 100037 3.Institute of Mineral ResourcesCAGSBeijing 100037

Among the endogenetic deposits in the Sanjiang area and at the west margin of the Yangtze platform, Himalayan deposits are the most important and contribute a large proportion of the resources of superlarge deposits. Among the controlled resources of this region, 84% of copper resources, 67% of Pb-Zn, 31% of Ag, 77% of gold and 24% of tin come from Himalayan deposits on the east side of the Qinghai-Tibet plateau. Himalayan endogenetic mineralization shows a relatively complete sequence evolution in the Sanjiang area and on the west margin of the Yangtze platform. Mineralization is manifested by gold deposits related to K-rich lamprophyre, REE deposits related to alkalic complexes and Cu-Au-polymetallic deposits related to alkaline porphyry. Six sequences of mineralization evolution since 65 Ma B.P. in the Sanjiang area and on the west side of the Yangtze platform can be recognized. Himalayan endogenetic mineralization on the east side of the Qinghai-Tibet plateau reached its peak before the Oligocene, corresponding to episodes I and II of the intracontinental orogenic cycle. Afterwards, mineralization waned obviously.

关键词： time sequence Himalayan endogenetic deposits Qinghai-Tibet plateau

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