检索结果-南通市图书馆

Linkage of mineral inclusions and zoning of magnetite with fluid evolution of hydrothermal systems: A case study of the Fenghuangshan Cu-Fe-Au skarn deposit， Eastern China

引用

Journal of Earth Science 2024年

作者： Xiao-Wen Huang Yiping Yang Mei-Fu Zhou yu-miao meng Jian-Feng Gao Liang Qi State Key Laboratory of Ore Deposit Geochemistry， Institute of Geochemistry， Chinese Academy of Sciences CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials， Guangzhou Institute of Geochemistry， Chinese Academy of Sciences

Magnetite from hydrothermal deposits may show compositional zoning with various mineral inclusions in response to the evolution of hydrothermal fluids. Magnetite from the Fenghuangshan Cu-Fe-Au skarn deposit (Eastern China) is a common mineral formed in the earlier stage of skarnization. Magnetite grains have dark gray and light gray zones and contain diverse mineral inclusions. Dark gray zones have higher Si， Ca， Al， and Mg contents than light gray zones. The magnetite matrix from dark gray zones shows superstructure along the [0-11] zone axis in fast Fourier transform patterns， different from magnetite from light gray zones with normal structure. Three types of mineral inclusions are identified within magnetite: nano-， micron- and submicron-nanometer inclusions. Nanoinclusions hosted in dark gray zones are actinolite， diopside， and trace element-rich magnetite， and these are likely formed by growth entrapment during magnetite crystallization at the skarn stage. The chain-width order-disorder intergrowths of diopside nanoinclusion likely indicate fluctuating fluid compositions in a lattice scale. Submicron to nanometer inclusions at the boundary between dark gray and light gray zones are quartz， titanite， and Ti-rich magnetite， which were formed via a dissolution and reprecipitation process at the quartz-sulfide stage. Micron-inclusions randomly distributed in both dark and light gray zones include calcite， ankerite， quartz， and chlorite， and these were formed via penetration of fluids at the carbonate stage. Zoned magnetite was formed by fluid replacement， overgrowth， and fluid infilling. Our study highlights the importance of mineral inclusion assemblages， and textural and chemical zonation of magnetite in constraining fluid evolution.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Germanium isotope geochemistry: analysis, fractionation mechanisms and geochemical tracing

引用

矿物学报 2015年第S1期35卷 1129-1130页

作者：戚华文 Olivier Rouxel yu-miao meng Rui-Zhong Hu State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences IFREMER Centre de Brest Dept.Géosciences Marines

Introduction Since Ge isotope is a new nontraditional isotope,the accumulated Ge isotope literatures are quite *** available researches mainly focused on two aspects:(1)the measurement of Ge isotopic compositions of geological and extraterrestrial materials,such as igneous rocks,marine sediments,seafloor hydrothermal fluids,hydrothermal Fe-oxyhydroxides,terrestrial high-temperature geothermal fluids,sphalerite,and iron meteorites;and(2)theoretical prediction of germanium isotope fractionation.

关键词： isotope fractionation hydrothermal geochemical geochemistry isotopic terrestrial tracing accumulated pyrite

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

Prediction of damage potential in mainshock–aftershock sequences using machine learning algorithms

引用

Earthquake Engineering and Engineering Vibration 2024年第4期23卷 919-938页

作者： Zhou Zhou Wang meng Han miao yu Xiaohui Lu Dagang School of Civil and Transportation Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China Multi-Functional Shaking Tables Laboratory Beijing University of Civil Engineering and ArchitectureBeijing 100044China College of Civil Engineering Tongji UniversityShanghai 200092China College of Civil Engineering and Architecture Guilin University of TechnologyGuilin 541004China School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China

Assessing the potential damage caused by earthquakes is crucial for a community’s emergency *** this study,four machine learning(ML)methods—random forest,extremely randomized trees,AdaBoost(AB),and gradient boosting(GB)—were employed to develop prediction models for the damage potential of the mainshock(DIMS)and mainshock–aftershock sequences(DIMA).Building structures were modeled using eight single-degree-of-freedom(SDOF)systems with different hysteretic rules.A set of 662 recorded mainshock–aftershock(MS-AS)ground motions was selected from the PEER *** intensity measures(IMs)were chosen to represent the characteristics of the mainshock and *** results revealed that the selected ML methods can well predict the structural damage potential of the SDOF systems,except for the AB *** GB model exhibited the best performance,making it the recommended choice for predicting DIMS and DIMA among the four ML ***,the impact of input variables in the prediction was investigated using the shapley additive explanations(SHAP)*** high-correlation variables were sensitive to the structural period(T).At T=1.0 s,the mainshock peak ground velocity(PGVM)and aftershock peak ground displacement(PGDA)significantly influenced the prediction of *** T increased to 5.0 s,the primary high-correlation factor of the mainshock IMs changed from PGVM to the mainshock peak ground displacement(PGDM);however,the highcorrelation variable of the aftershock IMs remained *** high-correlation factors for DIMS showed trends similar to those of ***,a table summarizing the first and second high-correlation variables for predicting DIMS and DIMA were provided,offering a valuable reference for parameter selection in seismic damage prediction for mainshock–aftershock sequences.

关键词： machine learning mainshock-aftershock damage potential prediction the high-correlation variables SDOF systems

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

Critical Metals Ga,Ge and In in the Global Pb-Zn Deposits:Current Understanding,Challenges and Perspectives

引用

Journal of Earth Science 2023年第4期34卷 1308-1311页

作者： Yi Zheng Peng-Peng yu Zhan-Ke Li Suo-Fei Xiong Ling-Li Zhou Jia-Xi Zhou ChangMing Wang yu-miao meng yu Zhang Ye-Jian Wang Jing Xu yue Wu Lan-Xuan Guo Taiping Zhao Guangdong Provincial Key Lab of Geological Process and Mineral Resources Survey School of Earth Sciences and Geological EngineeringSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Geological Processes and Mineral Resources School of Earth ResourcesChina University of GeosciencesWuhan 430074China Collaborative Innovation Center for Exploration of Strategic Mineral Resources China University of GeosciencesWuhan 430074China Department of Earth Sciences Vrije Universiteit Amsterdam de Boelelaan 1085Amsterdam 1081HVNetherlands Key Laboratory of Critical Minerals Metallogeny in Universities of yunnan Province School of Earth SciencesYunnan UniversityKunming 650500China State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of ScienceGuiyang 550081China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring School of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Zijin School of Geology and Mining Fuzhou UniversityFuzhou 350108China Key Laboratory of Exploration Technologies for Oil and Gas Resources Key Laboratory of Petroleum Geochemistry and EnvironmentYangtze UniversityWuhan 430100China Zhongjin Lingnan Nonfemetal Co. LtdShenzhen 518000China Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

BACKGROUND A spectrum of strategically critical metals, such as gallium(Ga), germanium(Ge) and indium(In), with promising applications in green and high-tech fields, are produced as byproducts of zinc ores in a variet... 详细信息

关键词： magmatic hydrothermal porphyry

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

Advanced electrospinning nanomaterials:From spinning fabrication techniques to electrochemical applications

引用

Nano Research 2024年第8期17卷 7077-7116页

作者： Jie Zhang miao yu Shuhui Tao College of Materials Science and Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Sichuan UniversityChengdu 610065China National University of Singapore(Chongqing)Research Institute Chongqing 401123China

Fuel cells,rechargeable metal–air batteries,metal-ion batteries,and supercapacitors have been regarded as prospective energy sources technologies to replace the fossil ***,electrochemical sensors also have been successfully developed as promising platforms for detecting pollutants,drug analysis,and healthcare *** is a scalable and suitable technique to design and fabricate diverse nanofibers and their nanocomposites for key components in electrochemical ***,a comprehensive review of electrospinning,from the technological innovations to the novel electrospun composite nanofibers,is *** importantly,the recent advances on the diverse components of electrochemical devices are highlighted,followed with the detailed discussion about the corresponding enhancement mechanism based on the electrospun ***,the currently faced challenges on the fabrication of electrospun nanomaterials are raised and a brief perspective for the future development of electrospun nanomaterials-based electrochemical applications is prospected.

关键词： electrospinning carbon nanofibers metal-organic frameworks electrode materials electrochemical applications

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

Heat Transfer Characteristics of a Microchannel Heat Sink with Highly-Dense Micro-Jet Arrays

引用

Journal of Thermal Science 2024年第3期33卷 1148-1160页

作者： ZHANG yu CHEN Xiaoyan miao Lin CHEN Liang HOU yu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China Beijing Aerospace Technology Institute Beijing100083China

This paper proposed a new structure of highly-dense micro-jet arrays for hybrid jet-impingement/microchannel heat sinks(~120 jet per cm^(2) with jet width of 0.35 mm).Parametric study is performed to investigate the influence of structure and flow parameters on the convective heat transfer of water jet cooling in confined *** simulation results show that the optimal jet width,jet spacing and impingement distance are around 0.2 mm,0.2 mm and 0.3 mm,respectively,which can achieve a low thermal resistance as well as a relatively low pressure *** analysis of the heat transfer pathways shows that the micro-fin jet structures can extend the impinging heat transfer area and conduct a considerable proportion of heat,which can reach up to 38.9%with the Reynolds number ranging from 797.1 to *** heat transfer characteristics in the heat sink will shift from impingement dominated heat transfer to the channel-convection dominated heat transfer as the jet impingement distance increases.A correlation is proposed to predict the average Nusselt number on the stagnation area for the heat sink with different structure parameters,and the deviations of predictions from the numerical results are less than 10%.

关键词： hybrid heat sink impingement microchannel thermal management high heat flux

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

Species-specific and generalized allometric biomass models for eight Fagaceae species in the understory of evergreen broadleaved forests in subtropical China

引用

Journal of Forestry Research 2024年第4期35卷 156-170页

作者： Shengwang meng Qianyanzhou Ecological Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101People’s Republic of China

Quantifying the biomass of saplings in the regeneration component is critical for understanding biogeochemical processes of forest ***,accurate allometric equations have yet to be developed in sufficient *** develop species-specific and generalized allometric equations,154 saplings of eight Fagaceae tree species in subtropical China’s evergreen broadleaved forests were *** dendrometric variables,root collar diameter(d),height(h),and crown area(ca)were applied in the model by the weighted nonlinear seemingly unrelated regression *** only d as an input variable,the species-specific and generalized allometric equations estimated the aboveground biomass reasonably,with R _(adj)^(2) values generally>*** h and/or ca improved the fitting of some biomass components to a certain *** equations showed a relatively large coefficient of variation but comparable bias to species-specific *** in the absence of species-specific equations at a given location are generalized equations for mixed species *** developed regression equations can be used to accurately calculate the aboveground biomass of understory Fagaceae regeneration trees in China’s subtropical evergreen broadleaved forests.

关键词： Allometry Aboveground biomass Additivity Regeneration Subtropical China

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

Capture Efficiency Analysis in the Circular Restricted Three-body Problem

引用

Research in Astronomy and Astrophysics 2024年第5期24卷 198-210页

作者： yu-Xuan miao Xi-yun Hou Department of Astronomy and Space Science Nanjing UniversityNanjing 210023China Institute of Space Environment and Astrodynamics Nanjing UniversityNanjing 210023China Key Laboratory of Modern Astronomy and Astrophysics Ministry of EducationNanjing 210023China

Temporary capture efficiency is studied in the framework of the circular restricted three-body problem in two ***, a non-uniform distribution of test particles around the secondary's orbit is obtained by fully accounting the secondary's gravitational influence. Second, the capture efficiency is computed based on the non-uniform distribution. Several factors influencing the result are discussed. By studying the capture efficiency in the circular restricted three-body problem of different mass ratios, a power-law relation between the capture efficiency(p) and the mass ratio(μ) is established, which is given by p ≈ 0.27 × μ^(0.53), within the range of 3.0035 ×10^(-6)≤ μ ≤ 3.0034 × 10^(-5). Taking the Sun–Earth system as an example, the influence from the orbit eccentricity of the secondary on the non-uniform distribution and the capture efficiency is studied. Our studies find that the secondary's orbit eccentricity has a negative influence on the capture efficiency.

关键词： methods numerical-celestial mechanics-planets and satellites dynamical evolution and stability

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

International standard of Traditional Chinese Medicine techniques: the operating specification for Traditional Chinese Medicine enema(2022)

引用

Journal of Traditional Chinese Medicine 2024年第5期44卷 1035-1043页

作者： yu miao PEI Xiaohua Department of General surgery Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical University Department of Chest and Breast Surgery Beijing University of Chinese Medicine Xiamen Hospital

Chinese Medicine Enema is one of the external therapies in Traditional Chinese Medicine(TCM), which has been widely used clinically. The "International Standard of Traditional Chinese Medicine Techniques: The Operating Specifications for Chinese Medicine Enema is drawn up by the Beijing Hospital of Traditional Chinese Medicine affiliated to Capital Medical University and Beijing University of Chinese Medicine Xiamen Hospital in collaboration with domestic TCM universities and hospitals. The specification includes definition, operating process, points for attention and contraindications. It is targeted to provide reference for TCM providers at home and abroad with TCM background in clinical decision-making.

关键词： Chinese Medicine Enema international standard operating specifications traditional Chinese medical technology

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Prediction of ball-on-plate friction and wear by ANN with data-driven optimization

引用

Friction 2024年第6期12卷 1235-1249页

作者： Alexander KOVALEV yu TIAN Yonggang meng State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

For training artificial neural network(ANN),big data either generated by machine or measured from experiments are used as input to"learn"the unspecified functions defining the *** experimental data are fed directly into the optimizer allowing training to be performed according to a predefined loss *** predict sliding friction and wear at mixed lubrication conditions,in this study a specific ANN structure was so designed that deep learning algorithms and data-driven optimization models can be *** ball-on-plate friction and wear data were analyzed using the specific training procedure to optimize the weights and biases incorporated into the neural layers of the ANN,and only two independent experimental data sets were used during the ANN optimization *** the training procedure,the ANN is capable to predict the contact and hydrodynamic pressure by adapting the output data according to the tribological condition implemented in the optimization algorithm.

关键词： machine learning deep learning artificial neural network mixed lubrication

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

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：