检索结果-南通市图书馆

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

川南—川东地区龙马溪组优质页岩分布及主控因素

引用

特种油气藏 2024年第4期31卷 54-63页

作者：陈渝川林伟李明涛韩登林郭伟长江大学湖北武汉430100 临沂大学山东临沂276000 中国石油勘探开发研究院北京100083

四川盆地海相页岩气资源丰富,自古生代至新生代,盆地经历了多期构造运动,形成了复杂的构造样式和多变的沉积环境,导致页岩气资源分布不均。为厘清优质页岩的分布规律,以川南—川东地区龙马溪组页岩为例,开展了全岩X衍射、地球化学测试... 详细信息

四川盆地海相页岩气资源丰富,自古生代至新生代,盆地经历了多期构造运动,形成了复杂的构造样式和多变的沉积环境,导致页岩气资源分布不均。为厘清优质页岩的分布规律,以川南—川东地区龙马溪组页岩为例,开展了全岩X衍射、地球化学测试、盆地模拟、钻录井资料分析,从沉积、成藏、构造等角度对优质页岩的分布规律及主控因素进行了讨论并划分页岩气勘探开发有利区。研究表明:川南—川东地区优质页岩主要分布在半深水—深水陆棚相;R_(o)值为2.5%~3.5%时有利于发育优质页岩;褶皱构造对页岩气的富集和分布起到较为明显的控制作用。研究结果可为川南—川东地区的页岩探勘开发提供理论依据。

关键词：页岩主控因素沉积环境储层分布龙马溪组川南—川东地区

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

拉曼光谱技术在微生物细胞代谢动态研究中的应用进展

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On Minerogenetic Series: The Third Discussion

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于模态分解和深度学习的煤矿微震时序预测方法

引用

煤炭学报 2024年第9期49卷 3781-3797页

作者：秦长坤赵武胜贾海宾高未己陈郁川于万泉梁记忠陈卫忠中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 中国科学院大学北京100049 山东新巨龙能源有限责任公司山东菏泽274918

微震监测数据对煤矿冲击地压等动力灾害预测和预警具有重要作用,利用历史微震监测数据来预测未来微震事件的演化特征是提高冲击灾害预测和预警时效性与准确性的有效方法。然而,由于微震数据是典型的非平稳时间序列,一般的时序预测方法... 详细信息

微震监测数据对煤矿冲击地压等动力灾害预测和预警具有重要作用,利用历史微震监测数据来预测未来微震事件的演化特征是提高冲击灾害预测和预警时效性与准确性的有效方法。然而,由于微震数据是典型的非平稳时间序列,一般的时序预测方法很难进行准确的预测。为此,提出了一种基于模态分解技术和深度学习方法相结合的微震时序预测方法。该方法首先使用自适应噪声完备集合经验模态分解(CEEMDAN)将微震数据分解为多个本征模态序列。然后,通过样本熵将分解后的序列重构为高频、低频和趋势序列。接着,利用变分模态分解(VMD)将高频和低频序列再次分解为多个新的本征模态序列,用作微震数据的多元特征时间序列。最后,将一定时窗内的微震多元特征时间序列和历史微震数据作为输入,下一时刻的微震监测数据作为输出,建立了卷积神经网络(CNN)和长短期记忆网络(LSTM)相结合的微震时序预测模型,并采用贝叶斯优化方法对模型的超参数进行寻优,提高微震预测的准确性。依托新巨龙煤矿多个工作面微震监测数据,使用该方法对微震日最大能量、日平均能量和日频次进行了预测,并针对微震日最大能量数据进行了系列对比试验研究。结果表明,提出的方法能够较好地预测微震事件演化趋势,预测结果和实际监测值误差较小,具有良好的预测性能和泛化性能。

关键词：微震预测冲击地压模态分解深度学习时间序列

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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 optical crystal micro water dissolution machining micro emulsion fluid ultra-precision surface FTIR spectra surface residue cleaning

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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(TDM1)from 671 to 821 Ma,indicating that the NAGC originated from juvenile source rocks and exhibits geochemical characteristics of A1-and AA-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： AA-type granitee new zircon UU-Pb zircon agees NE China lithospheric exxtension

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：