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Crustal Thermo-Structure and Geothermal Implication of the Huangshadong Geothermal Field in Guangdong Province

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Journal of Earth Science 2023年第1期34卷 194-204页

作者： zhicai xiao Shuai Wang Shihua Qi Jian Kuang Min Zhang Hailong Li School of Applied Technology Lijiang Teachers CollegeLijiang674199China School of Earth Resources China University of GeosciencesWuhan430074China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan430078China No.935 Geological Brigade Geology Bureau for Nonferrous Metals of Guangdong ProvinceHuizhou516000China SinoProbe Center-China Deep Exploration Center Chinese Academy of Geological SciencesBeijing100037China

Dense distribution of granites and surrounding hot springs, the high anomalous heating rates of geothermal fluids and the high geothermal gradients in shallow crust in Southeast China are revealed by previous geothermal explorations. However, there have always been debates on the genesis of geothermal anomalies of Southeast China. It is imperative to look into the genesis mechanism of geothermal anomalies through selecting a typical geothermal field, and constructing fine crustal thermostructure. In this study, in-depth excavation is implemented for the previous data of geophysical exploration and deep drilling exploration in the Huangshadong area. We synthetically analyze the results of radioactive heat productions(RHPs), thermophysical properties of rocks and audio-frequency magnetotellurics(AMT) sounding. This study concludes that the coefficient of radioactive heat generation(RHG) of crustal rocks and conduction heat of concealed granites is the main formation mechanism of geothermal anomalies of South China, where occurs a Great Granite Province. There is a regional indicating implication for the genesis of geothermal anomalies, taking the Huangshadong geothermal field as a typical example. It is also an important reference to guide the exploration, evaluation, development and utilization of geothermal resources in this region.

关键词： Huangshadong geothermal field thermo-structure geothermal genesis radioactive heat geothermal exploration

Petrogenesis, Tectonic Evolution and Geothermal Implications of Mesozoic Granites in the Huangshadong Geothermal Field, South China

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Journal of Earth Science 2020年第1期31卷 141-158页

作者： zhicai xiao Shuai Wang Shihua Qi Jian Kuang Min Zhang Feng Tian Yongjie Han State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China School of Environmental Studies China University of GeosciencesWuhan 430074China No.935 Geological Brigade Geology Bureau for Nonferrous Metals of Guangdong ProvinceHuizhou 516000China

Mesozoic multi-stage tectono-magmatic events produced widely distributed granitoids in the South China Block. Huangshadong(HSD) is located in south-eastern South China Block, where closely spaced hot springs accompany outcrops of Mesozoic granites. New data on whole-rock geochemistry, zircon U-Pb geochronology, and zircon Lu-Hf isotopes are presented, to study the petrogenesis and tectonic evolution of the granites, and to explore the relationship between granites and geothermal anomalies. Zircon U-Pb isotopes display three periods of granites in the HSD area: Indosinian(ca. 253 Ma, G4) muscovite-bearing monzonitic granite, early Yanshanian(ca. 175–155 Ma, G5 and G3) monzonitic granite and granodiorite, and late Yanshanian(ca. 140 Ma, G1 and G2) biotite monzonitic granite. In petrogenetic type, granites of the three periods are I-type granite. Among them, G1, G2, G3, and G4 are characterized by high fractionation, with high values of SiO2, alkalis, Ga/Al, and Rb/Sr, and depletion in Sr, Ba, Zr, Nb, Ti, REEs, with low(La/Yb)N, Nb/Ta, and Zr/Hf ratios and negative Eu anomalies. In terms of tectonic setting, 253 Ma G4 may be the product of partial melting of the ancient lower crust under post-orogenic extensional tectonics, as the closure of the Paleo-Tethys Ocean resulted in an intracontinental orogeny. At 175 Ma, the subduction of the Pacific Plate became the dominant tectonic system, and low-angle subduction of the Paleo-Pacific Plate facilitated partial melting of the subducted oceanic crust and basement to generate the hornblende-bearing I-type granodiorite. As the dip angle of the subducting plate increased, the continental arc tectonic setting was transformed to back-arc extension, inducing intense partial melting of the lower crust at ca. 158 Ma and resulting in the most frequent granitic magmatic activity in the South China hinterland. When slab foundering occurred at ca. 140 Ma, underplating of mantle-derived magmas caused melting of the continental crust, ge

关键词： radioactive heat Yanshanian granites highly fractionated geothermal genesis tectonic evolution

Characteristics of Hydrogen and Oxygen Isotopes and Noble Gas Isotopes in the Groundwater of Weishan, Wudalianchi, Northeast China

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1729-1741页

作者： WANG Shuai HUANG Xuelian QI Shihua HAN Yongjie KUANG Jian WANG Siqi WANG He xiao zhicai School of Environmental Studies China University of GeosciencesWuhan 430078China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430078China Chinese Academy of Geological Sciences Beijing 100037China Hydrogeological Engineering Geological Survey Institute of Heilongjiang Province Harbin 150030China

According to the hydrochemical characteristics, hydrogen and oxygen isotope characteristics and the ratio of noble gas isotopes of the sandstone aquifer and basalt aquifer, this study calculated the recharge temperature and residence time of groundwater in the Weishan area of Wudalianchi, also calculating the contribution of noble gas components from different sources to the samples. Based on the characteristics of hydrogen and oxygen isotopes and noble gases Xe and Ne, the recharge altitude and recharge temperature of the two aquifers were estimated, and the recharge temperature fitting with the NGT model as verified, the results showing that the main recharge altitude of groundwater in the region was 500–600 m, the recharge temperature being 2–7°C. He_(eq) and He_(ea) of the samples have been simulated using the OD model, the content of radioactive ~4He in the crust being obtained, the groundwater ages under the two conditions(closed condition and open condition) both being simulated. The results show that groundwater from the sandstone layer water is older than groundwater from the basalt layer. Hydrochemical characteristics and noble gas isotope ratios indicate that in the basalt aquifer and sandstone aquifer in the Weishan area, in addition to atmospheric and crustal helium, there is also an input of mantle-derived helium. The fault constitutes the uplift channel for groundwater containings mantle components, which results in the mantle source composition in water samples near the fault being much higher than those form non-fault areas.

关键词： groundwater hydrochemistry hydrogen and oxygen isotopes noble gases ~4He age mantle source input

Upwelling of Mantle-derived Material in Southeast China:Evidence from Noble Gas Isotopes

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 100-110页

作者： WANG Shuai KUANG Jian HUANG Xuelian ZHANG Hongyan ZHANG Min QI Shihua HAN Yongjie xiao zhicai WANG Siqi TANG Ling China University of Geosciences Wuhan 430074China No.935 Geological Brigade Geology Bureau for Nonferrous Metals of Guangdong ProvinceHuizhouGuangdong 516000China Chinese Academy of Geological Sciences Beijing 100037China

Shallow groundwater collected in Chaozhou,Huizhou,and Guangzhou allowed testing of concentrations and the isotope ratios of noble *** on the calculated noble gas temperature(NGT)and the ratio of noble gas isotopes,the recharge temperature,recharge source,and residence time of groundwater can be *** addition,the contribution of noble gas components from different sources to the sample components can be *** the Huizhou area,according to the 1/Xe ***/Xe and NGT data,the shallow sandstone-confined water samples in the Shiba area and the unconfined water samples of the Huangshadong are in different temperature ranges,indicating that they have different recharge sources,both in time or *** He components in the samples are calculated to obtain the content of radiogenic ^(4)He in the crust and to simulate the groundwater *** noble gas isotope ratios show the addition of mantle components into the basalt aquifers and sandstone aquifers in Chaozhou and *** for atmospheric and crustal sources,there is a certain proportion of mantle-derived components in the shallow underground cold water in Huizhou and *** noble gases in the Chaozhou groundwater have an obvious mantle signature,allowing speculation that there is a deep fluid carrying mantle *** upwelling of mantle-derived material might be caused by the India-Eurasia collision or that between the Philippine Sea Plate and the Eurasian Plate.

关键词： groundwater hydrochemistry noble gases ^(4)He age mantle source input southeast China

Modeling and Simulation of Three Phase PWM Rectifier Based on One-cycle Control

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Modeling and Simulation of Three Phase PWM Rectifier Based o...

基于局部图嵌入加权罚SVM的模拟电路故障诊断方法

2012年计算机应用与系统建模国际会议

作者： Zhang Shutuan Pi Zhijun xiao zhicai Department of Control Engineering Naval Aeronautical and Astronautical University

In this paper, the three phase rectifier based on one-cycle control technique is introduced. The operation principle of the one-cycle control is given, and the simulation models based on the saber software is constructed. The simulation results show that the input current of the rectifier is identical with its corresponding input voltage, and the rectifier can realize high power factor by adopting the one-cycle control technique, and achieve the design requirement,and the three phase rectifier based on one-cycle control is very reliable and stable method.

关键词： Rectifier One-cycle control technique Power factor Simulation

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电工技术学报 2016年第4期31卷 28-35页

作者：廖剑史贤俊周绍磊肖支才中国人民解放军第91550部队海军航空工程学院控制工程系

针对传统支持向量机(SVM)在模拟电路故障诊断应用中存在的不足,提出一种基于局部图嵌入加权罚支持向量机(LGEWP-SVM)的模拟电路故障诊断新方法。通过在保持数据整体类间间隔最大化的基础上优化数据流形的局部分布,同时在惩罚系数中引入... 详细信息

针对传统支持向量机(SVM)在模拟电路故障诊断应用中存在的不足,提出一种基于局部图嵌入加权罚支持向量机(LGEWP-SVM)的模拟电路故障诊断新方法。通过在保持数据整体类间间隔最大化的基础上优化数据流形的局部分布,同时在惩罚系数中引入数据的全局分布信息,设计了一种依赖于数据分布的新型支持向量机。该方法有效融合了数据的先验分布信息,增强了算法的抗干扰能力,提高了模型的诊断准确度。实验结果验证了所提方法的有效性。

关键词：模拟电路故障诊断支持向量机数据流形

烧结助剂对氮化硅陶瓷热导率和力学性能的影响

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硅酸盐学报 2020年第12期48卷 1865-1871页

作者：刘剑谢志鹏肖志才肖毅清华大学新型陶瓷与精细工艺国家重点实验室北京100084 常德科锐新材料科技有限公司湖南常德415000

以氮化硅(α相≥95%,平均粒径0.5μm)为原料,添加MgO-Y2O3为复合烧结助剂,采用气压烧结技术制备了β相高导热氮化硅陶瓷。研究和讨论了烧结助剂含量和比例对氮化硅陶瓷致密化过程、热导率、力学性能和显微结构的影响。结果表明:当烧结... 详细信息

以氮化硅(α相≥95%,平均粒径0.5μm)为原料,添加MgO-Y2O3为复合烧结助剂,采用气压烧结技术制备了β相高导热氮化硅陶瓷。研究和讨论了烧结助剂含量和比例对氮化硅陶瓷致密化过程、热导率、力学性能和显微结构的影响。结果表明:当烧结助剂添加量为5%MgO+4%Y2O3时,使用气压烧结在1 890℃烧结2 h,试样的热导率可达到85.96 W·m^-1K^-1,抗弯强度达到873 MPa,断裂韧性为8.39 MPa·m^1/2;在烧结过程中Y2O3与Si3N4反应形成化合物固定在晶界处,减少了固溶进氮化硅晶格中氧的含量,起到了净化氮化硅晶格的作用,提高了烧结试样的热导率;过量的MgO或Y2O3在烧结过程中形成的化合物残留在晶界处,降低了材料的力学性能和热导率。

关键词：氮化硅气压烧结热导率力学性能显微结构

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基于DTW时序距离的故障可诊断性评估方法

兵工学报 2024年第3期45卷 997-1009页

作者：吕佳朋史贤俊肖支才海军航空大学山东烟台264001

对装备中具体故障进行可诊断性评估,可以量化地表明故障被诊断的难易程度。针对故障可诊断性评价方法中存在的不客观及度量方法选择不恰当的问题,提出一种基于动态时间规整(Dynamic Time Warping,DTW)的时序距离度量方法。定义可诊断性... 详细信息

对装备中具体故障进行可诊断性评估,可以量化地表明故障被诊断的难易程度。针对故障可诊断性评价方法中存在的不客观及度量方法选择不恰当的问题,提出一种基于动态时间规整(Dynamic Time Warping,DTW)的时序距离度量方法。定义可诊断性评估模型,从实际系统中抽取系统的结构、信号、测试、故障模式4种要素,为故障可诊断性评估工作的开展打下基础。摒弃传统的从信号中提取特征进行相似性度量的做法,将信号看做时序序列,基于DTW方法衡量不同状态下各信号之间的相似程度,作为故障可诊断性的评估依据。使用动量轮系统对新方法进行仿真实验,仿真结果表明新方法在进行可诊断性评估方面具有客观性和有效性。

关键词：故障可诊断性定量评价动态时间规整相似性度量时间序列

On constructing Lyapunov function for formation control of Multi-agent Systems with directed topology

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On constructing Lyapunov function for formation control of M...