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1Regional Tectonic Transformation in East Kunlun Orogenic Belt in Early Paleozoic: Constraints from the Geochronology and Geochemistry of Helegangnaren Alkali-feldspar Granite显示文摘The Helegangnaren feldspar granite exposed in the eastern part of East Kunlun, is characterized by high concentrations of SiO2 and alkaline, low abundances of Fe, Mg and Ca, metaluminous-weak peraluminous. Trace elements analysis shows that the granite is depleted extremely in Ba, Sr and Eu, and rich in some large-ion lithophile elements and high field strength elements. Besides, the granite has high Ga contents, the values of 104 (Ga/Al) vary from 2.50 to 2.77, which is mainly greater than the lower limit of A-type granites (2.6), and is higher than the I-and S-type granites' average (2.1 and 2.28, respectively). Rare earth element (REE) is characterized by relatively high fractionations of light REE (LREE) and heavy REE (HREE) (LREE/HREE=9.3-13.60, (La/Yb)N =10.92-18.02), pronounced negative Eu anomalies (δEu=0.08-0.13), and exhibits right-dipping gull pattern. Major elements, rare elements and trace elements features show the granite is ascribed to A-type granite and A2 subtype in tectonic genetic type. They are plotted into post-collision or within-plate area in a variety of tectonic discriminations. Geological and geochemical data comprehensively suggest that the granite is formed in a post-collision extensive tectonic setting. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb dating yields a weighted mean age of 425 Ma, belonging to Middle Silurian, which is similar to the age of the post-collision geological events in the region. The differences of magmatic rocks in formation age, rocks assemblage and rocks series systematically indicate that the regional tectonic stress regime in the East Kunlun orogenic belt experienced a major transformation from compress to extension in Middle Silurianin, and the Helegangnaren feldspar granite intruded in the early stage of tectonic transformation.LI Ruibao PEI Xianzhi LI Zhuochen SUN Yu PEI Lei CHEN Guochao CHEN Youxin LIU Chengjun WEI Fanghui 2013Acta Geologica Sinica(English Edition)2013,87,2:35
2Facile synthesis of bimetallic N-doped carbon hybrid material for electrochemical nitrogen reduction显示文摘Due to the increasingly depleted limited fossil fuel resources,the development of renewable energy is the key to promote sustainable development which is an important part of the energy strategy[1].NH3 is one of most important and largest chemical productions in the world,it can be used as a feedstock for nitrogen fertilizer productions[2,3]or as a carbon-free energy carrier[4,5].Linchuan Cong Kaida Yao Siqi Zhang Ziqi Zhang Zhuochen Yu Miaomiao Qian Lina Qu Weimin Huang 2021Journal of Energy Chemistry2021,30,8:1
3A Bayesian belief-rule-based inference multivariate alarm system for nonlinear time-varying processes显示文摘This study considers the multivariate alarm design problem of nonlinear time-varying systems by a Bayesian belief-rule-based(BRB)method.In the method,the series of belief rules are constructed to approximate the relationship between input and output variables.Hence,the method does not require an explicit model structure and is suitable for capturing nonlinear causal relationships between variables.For the purpose of online application,this study further introduces sequential Monte Carlo(SMC)sampling to update the BRB model parameters,which is a fast and efficient method for approximately inferring nonlinear sequence models.Using the model parameters obtained by SMC sampling,the series of output variable tracking errors can be estimated and employed for multivariate alarm design.The case study of a condensate pump verifies the effectiveness of the proposed method.Xiaobin XU Zhuochen YU Jiusun ZENG Wanqi XIONG Yanzhu HU Guodong WANG 2021Science China(Information Sciences)2021,64,10:0
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