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Palladium,Platinum and Gold Concentrations in Fengshan Porphyry Cu-Mo Deposit,Hubei Province,China

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Acta Geologica Sinica(English Edition) 2009年第5期83卷 893-901页

作者： WANG Minfang deng xiaodong BI Shijian LI Zhanke Faculty of Earth Resources China University of Geosciences Wuhan 430074 China

The Fengshan porphyry-skarn copper-molybdenum （Cu-Mo） deposit is located in the south-eastern Hubei Province in east China. Cu-Mo mineralization is hosted in the Fengshan granodiorite porphyry stock that intruded the Triassic Daye Formation carbonate rocks in the early Cretaceous （-140 Ma）, as well as the contact zone between granodiorite porphyry stock and carbonate rocks, forming the porphyry-type and skaru-type association. The Fengshan granodiorite stock and the immediate country rocks are strongly fractured and intensely altered by hydrothermal fluids. In addition to intense skarn alteration, the prominent alteration types are potassic, phyllic, and propylitic, whereas argiilation is less common. Mineralization occurs as veins, stock works, and disseminations, and the main ore minerals are chalcopyrite, pyrite, molybdenite, bornite, and magnetite. The contents of palladium, platinum and gold （Pd, Pt and Au） are determined in nine samples from fresh and mineralized granodiorite and different types of altered rocks. The results show that the Pd content is systematically higher than Pt, which is typical for porphyry ore deposits worldwide. The Pt content ranges from 0.037 tol.765 ppb, and the Pd content ranges between 0.165 and 17.979 ppb. Pd and Pt are more concentrated in porphyry mineralization than skarn mineralization, and have negative correlations with Au. The reconnaissance study presented here confirms the existence of Pd and Pt in the Fengshan porphyry-skarn Cu-Mo deposit. When compared with intracontinent and island arc geotectonic settings, the Pd, Pt, and Au contents in the Fengshan porphyry Cu-Mo deposit in the intracontinent is lower than the continental margin types and island are types. A combination of available data indicates that Pd and Pt were derived from oxidized alkaline magmas generated by the partial melting of an enriched mantle source.

关键词： porphyry skarn copper-molybdenum palladium platinum gold Fengshan China

The effect of a seasonal stratification variation on the load exerted by internal solitary waves on a cylindrical pile

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Acta Oceanologica Sinica 2014年第7期33卷 21-26页

作者： CAI Shuqun XU Jiexin CHEN Zhiwu XIE Jieshuo deng xiaodong LV Haibin State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences

On the basis of Morison＇s empirical formula and modal separation method in estimating the force and torque exerted by internal solitary waves （ISWs） on a cylindrical pile, it is found that the loads exerted by the ISWs change largely in different seasons at the same site of the continental shelf in the South China Sea （SCS） even under the condition that the amplitudes of ISWs are the same. Thus, the effect of a seasonal water stratification variation on the force and torque exerted by the ISWs is investigated, and a three-parameter stratification model is employed. It is shown that the loads exerted by the ISWs depend largely on the wa- ter stratification. The stronger the water stratification, the larger the force and the torque; when the depth where the maximum thermocline appears is deepened, the force decreases but the torque increases; when the width of the thermocline is narrowed, the force increases but the torque decreases. The seasonal varia- tion of the force and the torque exerted by the ISWs in four seasons in the SCS is thus explained. Key words： internal solitary waves, force, torque, water stratification, South China Sea

关键词： internal solitary waves force torque water stratification South China Sea

3-D observations of a red tide event in the offshore water along the western Guangdong coast

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Acta Oceanologica Sinica 2015年第1期34卷 159-161页

作者： XIE Lingling CHEN Qingxiang HU Jianyu ZHANG Shuwen YI Xiaofei CHEN Fajin deng Rui deng xiaodong WANG Jing QI Yiquan Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction Technologies Guangdong Ocean University State Key Laboratory of Marine Environmental Science Xiamen University Guangdong Key Laboratory for Urbanization and Geo-simulation School of Geography and PlanningSun Yat-sen University State Key Laboratory of Tropic Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences

From November 24 to 26, 2014, a red tide event occurred in the offshore water off the Hailing Island located at the western Guangdong coast. The red tide appeared as pink strips distributed within 3 km in the offshore water and extended for about 10 km along the shoreline. During the flood tide, the pink seawater rushed to the beach with breaking waves, forming foam strips on the beach. Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction Technologies, Guangdong Ocean University, emergently responded to the event and organized three-dimensional observations from the air, onboard and on beach. The preliminary analyses of the cruise data and water samples indicate that the event was induced by non- toxic Noctiluca scintillans, of which the concentration reaches as high as 4 200 cells/L near the surface and 2600 cells/L at the bottom.

关键词： red tide Noctiluca scintillans marine pollution Hailing Island South China Sea

A numerical study on the circulation and tide in a zigzag bay

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Acta Oceanologica Sinica 2015年第1期34卷 119-128页

作者： YU Huaming WANG Zhaohua KUANG Liang WANG Lu BAO Xianwen WU He WANG Xin deng xiaodong College of Physical and Environmental Oceanography Ocean University of China Physical Oceanography Laboratory of the Ministry of Education Ocean University of China Environmental Resource Management Inc.PA 19406USA National Ocean Technology Center State Oceanic Administration East China Sea Marine Forecasting Center East China Sea BranchState Oceanic Administration

The Shacheng Bay （SCB） is one of the most complex coastal bays in southeast China and due to the fact of complicated geometry and dynamic coastal processes, it is considered as a challenging area for the nu- merical simulation of its hydrodynamic characteristics. The most advanced finite volume ocean model, fi- nite-volume coastal ocean model （FVCOM）, has adopted to simulate this hydrodynamic system, where tidal currents, tidal residual current and dye diffusion processes were studied and analyzed quantitatively. The validation of this numerical model matches well with various observation data, including elevation and current data. The misfit of a tidal elevation has a relative standard error of 3.66% and 4.67% for M2 and S2 tide components. The current validation shows a good match with an average error of 10 cm/s and 8° in the speed major axis and its direction respectively between the simulation and the measurement. This proves the robustness and reliability of this model. It is also found that the cape effect is significant and important in this system. The dye diffusion simulations show a 53 d flushing period for the whole inner bay waterbody. The results are of its first kind for understanding the hydrodynamic system in the SCB and they can provide helnful and trustful scientific information for others.

关键词： FVCOM Shacheng Bay circulation dye diffusion

Near-surface velocity inversion from Rayleigh wave dispersion curves based on a differential evolution simulated annealing algorithm

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Artificial Intelligence in Geosciences 2021年第1期2卷 35-46页

作者： Yaojun Wang Hua Wang Xijun Wu Keyu Chen Sheng Liu xiaodong deng Center for Information Geoscience University of Electronic Science and Technology of ChinaChengdu5162125China South Branch of Sinopec Geophysical Corporation Chengdu610041China

The utilization of urban underground space in a smart city requires an accurate understanding of the underground *** an effective technique,Rayleigh wave exploration can accurately obtain information on the *** particular,Rayleigh wave dispersion curves can be used to determine the near-surface shear-wave velocity *** is a typical multiparameter,high-dimensional nonlinear inverse problem because the velocities and thickness of each layer must be inverted *** methods such as simulated annealing(SA)are commonly used to solve this inverse ***,SA controls the iterative process though temperature rather than the error,and the search direction is random;hence,SA always falls into a local optimum when the temperature setting is ***,for the inversion of Rayleigh wave dispersion curves,the inversion accuracy will decrease with an increasing number of layers due to the greater number of inversion parameters and large *** solve the above problems,we convert the multiparameter,highdimensional inverse problem into multiple low-dimensional optimizations to improve the algorithm accuracy by incorporating the principle of block coordinate descent(BCD)into ***,we convert the temperature control conditions in the original SA method into error control *** the same time,we introduce the differential evolution(DE)method to ensure that the iterative error steadily decreases by correcting the iterative error direction in each ***,the inversion stability is improved,and the proposed inversion method,the block coordinate descent differential evolution simulated annealing(BCDESA)algorithm,is *** performance of BCDESA is validated by using both synthetic data and field data from western *** results show that the BCDESA algorithm has stronger global optimization capabilities than SA,and the inversion results have higher stability and *** addition,syn

关键词： Simulated annealing Differential evolution Block coordinate descent Surface wave dispersion curve Nonlinear inversion

公民身份理论视角下中国台湾青年国家认同的现状及其成因

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台湾研究 2023年第3期 62-71页

作者：邓小冬宁波大学马克思主义学院宁波大学浙江台湾研究院宁波市海峡两岸融合发展研究院

现代国家认同是在公民身份的基础上形成的。公民身份理论可为理解中国台湾青年国家认同的现状及其成因提供一种有益的视角。从公民身份理论视角来看,当前中国台湾青年的“赞同性国家认同”与“归属性国家认同”都出现明显的扭曲与错位... 详细信息

现代国家认同是在公民身份的基础上形成的。公民身份理论可为理解中国台湾青年国家认同的现状及其成因提供一种有益的视角。从公民身份理论视角来看,当前中国台湾青年的“赞同性国家认同”与“归属性国家认同”都出现明显的扭曲与错位。中国台湾青年所拥有的公民身份是其国家认同形成的重要依据。中国台湾青年所拥有的“中国台湾公民身份”本属于亚国家层次的公民身份,但“台独”势力通过构建公民身份制度与公民身份教育有意识地将这一公民身份建构成“国家层次”的公民身份,再加上中国台湾青年自身的公民身份实践,导致多数中国台湾青年以“中国台湾认同”作为自己的国家认同。

关键词：公民身份理论中国台湾青年国家认同

High-Precision Re-Os Geochronology of the newly Discovered Lihefu Deposit Reveals the~145 Ma Mo Mineralization in Daye District,Eastern China

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Journal of Earth Science 2024年第6期35卷 2144-2148页

作者： Hao Hu Longpeng Li Heng Luo Yi Huang Fang Sun Jinhua Liu xiaodong deng State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan430078China Central South Geological Survey Institute of China Metallurgical Geology Bureau Wuhan430081China

0 INTRODUCTION Skarn deposits,one of the most important ore types in the Earth's crust,are mined for a range of metals,including Cu,Au,Fe,W,Sn,and Mo(Chang et al.,2019;Meinert et al.,2005).Precise dating of the minera... 详细信息

关键词： Eastern dating mineralization

Nutrient Removal and Algal Community Variation from Urban River with the Isolated Microalgal Strains <i>Chlorella</i>sp. and <i>Scenedesmus</i>sp.

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Journal of Water Resource and Protection 2018年第9期10卷 884-895页

作者： Weiju Zhu Yajun Li Xiaowen Fei xiaodong deng Institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agricultural Science Haikou China School of Science Hainan Medical College Haikou China

The objectives of this study were to determine nutrient removal rates and algal community variation using the isolated microalgal strains Chlorella sp. and Scenedesmus sp. from an urban river water. The concentration of total nitrogen (TN) and total phosphorus (TP) in river water declined after pouring into Chlorella sp. and Scenedesmus sp., it was indicated that the Scenedesmus sp. had respective advantage in removing nitrogen (86% removal rate) and Chlorella sp. in removing phosphorous (95% removal rate). The algae community composition showed extreme sensitivity to change in the joint of the Scenedesmus or Chlorella, respectively, the lower diversity and higher dominance of algae can be observed in Scenedesmus group, there existed an opposite tendency in Chlorella group. The results demonstrated that the high potential of using Chlorella sp. and Scenedesmus sp. for nutrient removal from riverwater.

关键词： Nutrient Removal Algae Community Chlorella Scenedesmus Eutrophication

Changes in hippocampal histamine receptors in rats after treatment with Trimeresurus albolabris venom

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Neural Regeneration Research 2008年第7期3卷 728-732页

作者： Qiyi He Min deng xiaodong Yu Hui Li Yixin Lin Xia Chen School of Life Science Chongqing Key Laboratory of Zoobiology Chongqing Engineering Center of Bioactive Substance Chongqing Normal University Chongqing 400047 China

BACKGROUND： It has been demonstrated that histamine and its receptors in the hippocampus play an important role in memory and/or learning behaviors.OBJECTIVE： To investigate the expression levels of the histamine receptor gene and protein in the hippocampi of rats prior to and after administration of Trimeresurus albolabris venom using reverse transcription-polymerase chain reaction （RT-PCR） and Western blot techniques. DESIGN, TIME AND SETTING： A controlled observation based on cellular protein level was performed in the College of Life Sciences, Chongqing Normal University between March 2005 and April 2007. MATERIALS： Eighty adult male Sprague-Dawley rats were provided by the Laboratory Animal Center of the Third Military Medical University of Chinese PLA. The lyophilized powder of Trimeresurus albolabris venom was collected from Jin-Hu-Shan in Chongqing, China. METHODS： Twenty rats were randomly and evenly divided into an experimental group and a control group The experimental group was subcutaneously injected with 0.65 mg/mL Trimeresurus albolabris venom, 0.5 mL for each rat. The control group was subcutaneously injected with an equal amount of 0.9% physiological saline. Prior to and after injection, rats from these two groups were placed in the Morris Water Maze for recording of path length and escape latency. The remaining 60 rats were randomly allocated to another experimental group （n = 50） and another control group （n = 10）. Rats were correspondingly injected as described above. At different time points （0.1, 0.5, 1, 2, and 3 hours after injection）, rats were decapitated and bilateral hippocampal tissues were dissociated （approximately 100 mg for each sample）. Then, the acquired hippocampal tissue was immediately preserved at -70 ℃ for subsequent experiments. MAIN OUTCOME MEASURES：（1） The levels of histamine receptor （including H1R, H2R, and H3R） mRNA and protein in the hippocampi of rats were measured prior to and after injection of Trimeresurus

关键词： Trimeresurus albolabris histamine receptor H1, H2, H3 snakebite snake venom