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The First Discovery of the Early Palaeozoic Carbonatite in the Bayan Obo Deposit, Inner Mongolia, China: Evidence from Zircon U-Pb Geochronology

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2440-2442页

作者： KE Changhui li yike WU Zhongjian MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGS School of Earth Sciences and Resources China University of Geosciences

Objective The Bayan Obo in the northern North China Craton is the world’s largest REE-Nb-Fe deposit. The genesis of its hosted carbonatite is still controversial for sedimentary or igneous(Song et al.,2018). Recent geological exploration, including 1:10000 geological mapping and drilling exploration, have revealed new exposures of zonal distribution of alteration and mineralization, which combined with previous results of isotopical geochemistry indicate the

关键词： Pb Evidence from Zircon U-Pb Geochronology Inner Mongolia China

Built-in electric field induced S-scheme g-C_(3)N_(4)homojunction for efficient photocatalytic hydrogen evolution:Interfacial engineering and morphology control

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Nano Research 2024年第6期17卷 4961-4970页

作者： Yongpan Gu yike li Haoqiang Feng Yanan Han Zhongjun li College of Chemistry Zhengzhou UniversityZhengzhou 450001China

S-scheme possesses superior redox capabilities compared with the II-scheme,providing an effective method to solve the innate defects of g-C_(3)N_(4)(CN).In this study,S-doped g-C_(3)N_(4)/g-C_(3)N_(4)(SCN-tm/CN)S-scheme homojunction was constructed by rationally integrating morphology control with interfacial engineering to enhance the photocatalytic hydrogen evolution ***-situ Kelvin probe force microscopy(KPFM)confirms the transport of photo-generated electrons from CN to *** functional theory(DFT)calculations reveal that the generation of a built-in electric field between SCN and CN enables the carrier separation to be more efficient and *** transient absorption spectrum(fs-TAS)indicates prolonged lifetimes of SCN-tm/CN_(3)(τ1:9.7,τ2:110,andτ3:1343.5 ps)in comparison to those of CN(τ1:4.86,τ2:55.2,andτ3:927 ps),signifying that the construction of homojunction promotes the separation and transport of electron hole pairs,thus favoring the photocatalytic *** visible light irradiation,the optimized SCN-tm/CN_(3)exhibits excellent photocatalytic activity with the hydrogen evolution rate of 5407.3μmol·g^(−1)·h^(−1),which is 20.4 times higher than that of CN(265.7μmol·g^(−1)·h^(−1)).Moreover,the homojunction also displays an apparent quantum efficiency of 26.8%at 435 nm as well as ultra-long and ultra-stable cycle *** work offers a new strategy to construct highly efficient photocatalysts based on the metal-free conjugated polymeric CN for realizing solar energy conversion.

关键词： homojunction built-in electric field morphology control interfacial engineering carrier separation

Geochemical and Boron Isotopic Evidence that Tourmaline Records Country Rock Assimilation of Leucogranites in the Himalayan Orogen

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 123-134页

作者： HU Guyue GAO li’e ZENG lingsen li yike MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China MNR Key Laboratory of Deep-Earth Dynamics Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China

Tourmaline geochemical and boron(B)isotopic compositions in two-mica granites(TMG),tourmaline-bearing leucogranites(Tou-LG),tourmalites and metapelites from the Gyirong-Malashan areas of the Himalayan orogen provide evidence for country rock assimilation during the intrusion of Himalayan *** schorls in Gyirong leucogranitic plutons show low contents of MgO(0.238%-1.160%)and δ^(11)B values(-12.1‰--11.2‰),while dravites gathered in the contact zone between the leucogranitic veins and metapelites show high contents of MgO(4.815%-6.755%)and δ^(11)B values(-10.7‰--9.3‰).This geochemical and isotopic variation of tourmalines can also be identified in the Malashan gneiss *** a result,three types of tourmaline were identified in the Himalayan orogen:(1)Tou-Ⅰ in the TMG and Tou-LG,which is the most common tourmaline type of schorl;(2)Tou-Ⅱ(dravite and high-Mg schorl)in the Tou-LG and tourmalite at the margins of the leucogranite;and(3)Tou-Ⅲ(mainly dravite,with minor high-Mg schorl)in metapelites of the High Himalayan Crystalline *** lenses and veins of Tou-LG may have experienced metasomatism and assimilation as a result of interaction with the High Himalayan Crystalline Sequence metasedimentary country rocks,which can be traced by the geochemical and isotopic characteristics of the tourmaline therein.

关键词： boron isotope tourmaline granite country rock assimilation Himalayan orogen

A new hybrid method—combined heat flux method with Monte-Carlo method to analyze thermal radiation

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Journal of University of Science and Technology Beijing 2006年第1期13卷 25-28页

作者： Zengwu Zhao Daqiang Cang Wenfei Wu yike li Baowei li Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China Inner Mongolia University of Science and Technology Baotou 014010 China

A new hybrid method, Monte-Carlo-Heat-Flux （MCHF） method, was presented to analyze the radiative heat transfer of participating medium in a three-dimensional rectangular enclosure using combined the Monte-Carlo method with the heat flux method. Its accuracy and reliability was proved by comparing the computational results with exact results from classical ＂Zone Method＂.

关键词： radiation heat transfer scattering numerical simulation Monte-Carlo method heat flux method

Miocene Crustal Anatexis of Paleozoic Orthogneiss in the Zhada Area,Western Himalaya

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 954-971页

作者： CHEN Han HU Guyue ZENG lingsen YU Xuhui li yike College of Earth Science Chengdu University of TechnologyChengdu 610059China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

Granitic gneiss(orthogneiss)and Himalayan leucogranite are widely distributed in the Himalayan orogen,but whether or not the granitic gneiss made a contribution to the Himalayan leucogranite remains *** this study,we present the petrological,geochronological and geochemical results for orthogneisses and leucogranites from the Zhada area,Western *** orthogneiss is composed mainly of quartz,plagioclase,K-feldspar,biotite and muscovite,with accessory zircon and *** zircon cathodoluminescence(CL)images show that most grains contain a core with oscillatory zoning,which indicates an igneous *** high-resolution ion microprobe(SHRIMP)U-Pb dating of the zircon cores in the orthogneiss shows a weighted ^(206)Pb/^(238)U age of 515±4 Ma(early Paleozoic),with sponge-like zircon rims of 17.9±0.5 Ma(Miocene).Zhada leucogranite shows^(206)Pb/^(238)U ages ranging from 19.0±0.4 Ma to 12.4±0.2 Ma,the weighted average age being 16.2±0.4 *** leucogranites have a low Ca content(line

关键词： leucogranite orthogneiss petrogenesis crustal anatexis Zhada area Himalayan orogen

DDQNC-P: A framework for civil aircraft tactical synergetic trajectory planning under adverse weather conditions

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CHINESE JOURNAL OF AERONAUTICS 2024年第12期37卷 434-457页

作者： Zhang, Honghai Zhou, Jinlun Shi, Zongbei li, yike Zhang, Jinpeng Nanjing Univ Aeronaut & Astronaut Coll Civil Aviat Nanjing 211106 Peoples R China

Adverse weather during aircraft operation generates more complex scenarios for tactical trajectory planning, which requires superior real-time performance and conflict-free reliability of solving methods. Multi-aircraft real-time 4D trajectory planning under adverse weather is an essential problem in Air Traffic Control (ATC) and it is challenging for the existing methods to be applied effectively. A framework of Double Deep Q-value Network under the Critic guidance with heuristic Pairing (DDQNC-P) is proposed to solve this problem. An Agent for two aircraft synergetic trajectory planning is trained by the Deep Reinforcement Learning (DRL) model of DDQNC, which completes two aircraft 4D trajectory planning tasks preliminarily under dynamic weather conditions. Then a heuristic pairing algorithm is designed to convert the multi-aircraft synergetic trajectory planning into multi-time pairwise synergetic trajectory planning, making the multiaircraft trajectory planning problem processable for the trained Agent. This framework compresses the input dimensions of the DRL model while improving its generalization ability significantly. Substantial simulations with various aircraft numbers, weather conditions, and airspace structures were conducted for performance verification and comparison. The success rate of conflict-free trajectory resolution reached 96.56% with an average calculation time of 0.41 s for 350 4D trajectory points per aircraft, finally confirming its applicability to make real-time decision-making support for controllers in real-world ATC systems. (c) 2024 Production and hosting by Elsevier Ltd. on behalf of Chinese Society of Aeronautics and Astronautics. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Air traffic control Trajectory-based operation 4D trajectory planning Reinforcement learning Decision support systems

Generation of color-controllable room-temperature phosphorescence via luminescent center engineering and in-situ immobilization

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Chinese Chemical Letters 2023年第7期34卷 193-199页

作者： licheng Zheng Kai Jiang Jiaren Du yike li Zhongjun li Hengwei lin International Joint Research Center for Photo-responsive Molecules and Materials School of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Materials with controllable luminescence colors are highly desirable for numerous promising applications, however, the preparation of such materials, particularly with color-controllable room-temperature phosphorescence(RTP), remains a formidable challenge. In this work, we reported on a facile strategy to prepare color-controllable RTP materials via the pyrolysis of a mixture containing 1-(2-hydroxyethyl)-urea(H-urea) and boric acid(BA). By controlling the pyrolysis temperatures, the as-prepared materials exhibited ultralong RTP with emission colors ranging from cyan, green, to yellow. Further studies revealed that multiple luminescent centers formed from H-urea, which were in-situ embedded in the B2O3matrix(produced from BA) during the pyrolysis process. The contents of the different luminescent centers could be regulated by the pyrolysis temperatures, resulting in color-tunable RTP. Significantly, the luminescent center engineering and in-situ immobilization strategy not only provided a facile method for conveniently preparing color-controllable RTP materials, but also endowed the materials prepared at relatively lower temperatures with color-changeable RTP features under thermal stimulus. Considering their unique properties, the potential applications of the as-obtained materials for advanced anti-counterfeiting and information encryption were preliminarily demonstrated.

关键词： Carbon dots Room-temperature phosphorescence Luminescent center engineering In-situ immobilization Anti-counterfeiting Information security

Green and Near-Infrared Dual-Mode Afterglow of Carbon Dots and Their Applications for Confidential Information Readout

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Nano-Micro Letters 2021年第12期13卷 148-162页

作者： Yuci Wang Kai Jiang Jiaren Du licheng Zheng yike li Zhongjun li Hengwei lin College of Chemistry Zhengzhou UniversityZhengzhou 450001People’s Republic of China International Joint Research Center for Photo-Responsive Molecules and Materials School of Chemical and Material EngineeringJiangnan UniversityWuxi 214122People’s Republic of China Key Laboratory of Graphene Technologies and Applications of Zhejiang Province Ningbo Institute of Materials Technology&Engineering(NIMTE)Chinese Academy of SciencesNingbo 315201People’s Republic of China

Near-infrared(NIR),particularly NIR-containing dual-/multimode afterglow,is very attractive in many fields of application,but it is still a great challenge to achieve such property of materials. Herein,we report a facile method to prepare green and NIR dual-mode afterglow of carbon dots(CDs) through in situ embedding o-CDs(being prepared from o-phenylenediamine) into cyanuric acid(CA) matrix(named o-CDs@CA). Further studies reveal that the green and NIR afterglows of o-CDs@CA originate from thermal activated delayed fluorescence(TADF) and room temperature phosphorescence(RTP) of o-CDs,respectively. In addition,the formation of covalent bonds between o-CDs and CA,and the presence of multiple fixation and rigid e ects to the triplet states of o-CDs are confirmed to be critical for activating the observed dual-mode afterglow. Due to the shorter lifetime and insensitiveness to human vision of the NIR RTP of o-CDs@CA,it is completely covered by the green TADF during directly observing. The NIR RTP signal,however,can be readily captured if an optical filter(cut-o wavelength of 600 nm) being used. By utilizing these unique features,the applications of o-CDs@CA in anti-counterfeiting and information encryption have been demonstrated with great confidentiality. Finally,the as-developed method was confirmed to be applicable to many other kinds of CDs for achieving or enhancing their afterglow performances.

关键词： Carbon dots Dual-mode afterglow Room temperature phosphorescence Thermal activated delayed fluorescence Information security

The Electrical Conductivity Structure of the Lanping–Simao Basin and its Implications for Mineralization

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 1055-1056页

作者： li yike WANG Anjian CAO Dianhua GUAN Ye Institute of Mineral Resources Chinese Academy of Geological Sciences Institute of Geology Chinese Academy of Geological Sciences

Objective The Lanping-Simao Basin in western Yunnan, located in the southeastern margin of the Tibetan Plateau, is tectonically in the transition zone between the Gondwana and Eurasia tectonic domains. It is also the frontier zone of northeastern extrusion of the Indochina Plate towards the Eurasia Plate as well as the escape zone for the deep material. The middle axial tectonic zone, also known as the Lanping-Simao Fault （LSF） in previous study, is a giant intraplate tectonic belt composed of a series of narrow uplift belt, rupture depression zone, metamorphic belt, alteration belt and marginal fracture system, which were formed by the compressional uplift of the central depression of the Lanping-Simao Basin. This tectonic unit controls the geological evolution, seismic activity, hot spring distribution and ore formation of the LanpingSimao Basin since the Mesozoic and Cenozoic.

关键词： Simao Basin and its Implications for Mineralization The Electrical Conductivity Structure of the Lanping LSF