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Tectonic-thermal history and hydrocarbon potential of the Pearl River Mouth Basin,northern South China Sea:Insights from borehole apatite fission-track thermochronology

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China Geology 2023年第3期6卷 429-442页

作者： Xiao-yin Tang Shu-chun Yang sheng-biao Hu Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Petroleum Geomechanics China Geological SurveyBeijing 100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing 100081China CNOOC Research Institute Beijing 100028China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

The Pearl River Mouth Basin(PRMB)is one of the most petroliferous basins on the northern margin of the South China *** of the thermal history of the PRMB is significant for understanding its tectonic evolution and for unraveling its poorly studied source-rock maturation *** investigations in this study are based on apatite fission-track(AFT)thermochronology analysis of 12 cutting samples from 4 *** AFT ages and length data suggested that the PRMB has experienced quite complicated thermal *** history modeling results unraveled four successive events of heating separated by three stages of cooling since the early Middle *** cooling events occurred approximately in the Late Eocene,early Oligocene,and the Late Miocene,possibly attributed to the Zhuqiong II Event,Nanhai Event,and Dongsha Event,*** erosion amount during the first cooling stage is roughly estimated to be about 455-712 m,with an erosion rate of 0.08-0.12 mm/*** second erosion-driven cooling is stronger than the first one,with an erosion amount of about 747-814 m and an erosion rate between about 0.13-0.21 mm/*** erosion amount calculated related to the third cooling event varies from 800 m to 3419 m,which is speculative due to the possible influence of the magmatic activity.

关键词： Oil and gas Hydrocarbon potential Apatite fission-track Tectonic-thermal evolution Thermal history modeling Cooling event Heating event Marine geological survey engineering Erosion amount and rate Oil-gas exploration engineering Pearl River Mouth Basin The South China Sea

Evidence for interlayer coupling and moiréexcitons in twisted WS_(2)/WS_(2)homostructure superlattices

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Nano Research 2023年第2期16卷 3429-3434页

作者： Haihong Zheng biao Wu Shaofei Li Jun He Keqiu Chen Zongwen liu Yanping liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Shenzhen Research Institute of Central South University Shenzhen 518000China

The formation of moirésuperlattices in twisted van der Waals(vdW)homostructures provides a versatile platform for designing the electronic band structure of two-dimensional(2D)*** graphene and transition metal dichalcogenides(TMDs)moirésystems,twist angle has been shown to be a key parameter for regulating the moiré***,the effect of the modulation of the twist angle on moirépotential and interlayer coupling has not been the subject of experimental ***,we report the observation of the modulation of moirépotential and intralayer excitons in the WS_(2)/WS_(2)*** accurately adjusting the torsion angle of the homobilayers,the depth of the moirépotential can be *** confinement effect of the moirépotential on the intralayer excitons was further demonstrated by the changing of temperature and valley ***,we show that a detection of atomic reconstructions by the low-frequency Raman mapping to map out inhomogeneities in moirélattices on a large scale,which endows the uniformity of interlayer *** results provide insights for an in-depth understanding of the behaviors of moiréexcitons in the twisted van der Waals homostructure,and promote the study of electrical engineering and topological photonics.

关键词： moirésuperlattices moiréexcitons interlayer coupling moirépotential

Impact of Wetland Change on Local Climate in Semi-arid Zone of Northeast China

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Chinese Geographical Science 2015年第3期25卷 309-320页

作者： liu Yan sheng Lianxi liu Jiping State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration Northeast Normal University Institute of Ecology and Environment Jilin Normal University

Wetlands are sensitive to climate change, in the same time, wetlands can influence climate. This study analyzed the spa- rio-temporal characteristics of wetland change in the semi-arid zone of Northeast China from 1985 to 2010, and investigated the impact of large area of wetland change on local climate. Results showed that the total area of wetlands was on a rise in the study area. Although natural wetlands （marshes, riparians and lakes） decreased, constructed wetlands （rice fields） increased significantly, and the highest in- crease rate in many places exceeded 30%. Anthropogenic activities are major driving factors for wetland change. Wetland change pro- duced an impact on local climate, mainly on maximum temperature and precipitation during the period of May-September. The increase （or decrease） of wetland area could reduce （or increase） the increment of maximum temperature and the decrement of precipitation. The changes in both maximum temperature and precipitation corresponded with wetland change in spatial distribution. Wetland change played a more important role in moderating local climate compared to the contribution of woodland and grassland changes in the study area. Cold-humid effect of wetlands was main way to moderating local climate as well as alleviating climatic wanning and drying in the study area, and heterogeneity of underlying surface broadened the cold-humid effect of wetlands.

关键词： wetland change local climate rice field semi-arid zone Northeast China

Carbon Monoxide Alleviates Salt-Induced Oxidative Damage in Wheat Seedling Leaves

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Journal of Integrative Plant Biology 2006年第3期48卷 249-254页

作者： Ben-Kai Huang sheng Xu Wei Xuan Ming LI Ze-Yu Cao Kai-Li liu Teng-Fang Ling Wen-biao Shen College of Life Sciences Nanjing Agricultural University Nanjing 210095 China College of Sciences Nanjing Agricultural University Nanjing 210095 China

Carbon monoxide （CO）, a by-product released during the degradation of heme by heme oxygenases （EC 1.***.99.3） In animals, is regarded as an important physiological messenger or bioactive molecule involved in many biological events that has been recently reported as playing a major role in mediating the cytoprotectlon against oxidant-induced lung Injury. In the present study, we first determined the protective effect of exogenous CO against salt-induced oxidative damage in wheat seedling leaves. Wheat seedlings treated with 0.01μmol/L hematin as the CO donor demonstrated significant reversal of chlorophyll decay, dry weight, and water loss induced by 300 mmol/L NaCl stress. Interestingly, the increase in lipid peroxidation observed in salt-treated leaves was reversed by 0.01μmol/L hematin treatment. Time-couree analyses showed that application of 0.01μmol/L hematln enhanced gualacol peroxidase, superoxide dismutase, ascorbate peroxidase and catalase activities in wheat seedling leaves subjected to salt stress. These effects are specific for CO because the CO scavenger hemoglobin （1.2 mg/L） blocked the actions of the CO donor hematln. However, higher concentration of the CO donor （1.0μmol/L） did not alleviate dry weight and water loss of salt-stressed wheat seedlings. These results suggest that exogenous application of low levels of a CO donor may be advantageous against salinity toxicity.

关键词： carbon monoxide lipid peroxidation oxidative stress salinity seedling leaves wheat.

Cu and Zn Isotopic Evidence for the Magnitude of Organic Burial in the Mesoproterozoic Ocean

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Journal of Earth Science 2022年第1期33卷 92-99页

作者： Yiwen Lü sheng-Ao liu State Key Laboratory of Geological Processes and Mineral Resources and Institute of Earth SciencesChina University of GeosciencesBeijing 100083China

The rate of net primary production in the Proterozoic ocean was suggested to be no more than 10% of its modern value(Laakso and Schrag,2019),however,in the Mesoproterozoic Xiamaling Formation,the export production values could reach 20%-150% of the present-day Equatorial Atlantic average values(Zhang et al.,2016).Here,we report Zn and Cu isotope data for black shales from the Xiamaling Formation to illustrate the biogeochemical cycling of Zn and Cu in the Mesoproterozoic *** ^(65)Cu-enriched signature in the authigenic fraction is similar to that in bioauthigenic Cu of the modern marine *** Zn isotope ratios of sediments deposited in euxinic conditions are commonly higher than those of clastic sediments,indicating light Zn sinks in the coeval *** with previously reported Mo isotope data,the proportion of organic carbon to total carbon burial in the Mesoproterozoic was about as half as that at present,which is larger than the previous estimation―a quarter of today’s value(e.g.,Ozaki et al.,2019) and is evidenced by a wide distribution of black *** organic burial may be ascribed to the increasing phosphorus inputs from large igneous provinces and consequently high primary productivity,which has spurred the hypothesized atmosphere-ocean oxygenation at ~1.4 Ga.

关键词： zinc isotopes organic carbon Xiamaling Formation

Copper Isotope Fractionation during Basalt Leaching at 25℃ and pH=0.3,2

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Journal of Earth Science 2022年第1期33卷 82-91页

作者： Dandan Li sheng-Ao liu State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China

The geochemical cycling of copper in the hydrosphere and soil environments primarily involves the transport of Cu from rocks to rivers via *** the factors controlling Cu isotope fractionation during weathering is crucial for the purpose of using Cu isotopes as a tracer of geochemical ***,we performed acid-leaching experiments on natural basalts (BHVO-2 and GBW07105) and chalcopyrite in Erlenmeyer flasks at T=25℃ and different pH values (0.3 and 2).Our results reveal substantial Cu isotope fractionations (△^(65)Cu_(solution-initial)) between leachates (Cu_(solution)) and starting materials (Cu_(initial)).The leachates released from GBW07105 and chalcopyrite are consistently enriched in heavier Cu isotopes relative to the starting materials at pH=***,the δ^(65)Cu_(solution)values decrease to about-0.6‰first,then increase to>0 for BHVO-2 at pH=2 and GBW07105 at pH=*** results indicate that leaching of natural rocks by acidic liquids can produce both positive and negative Cu isotope fractionation,depending on pH values and the types of minerals in starting materials.X-ray power diffraction analysis (XRD) patterns reveal similar mineral assemblages between starting basalts and residues after each reaction *** most likely mechanisms responsible for such Cu isotope fractionation are the relative rates of Cu oxidation at the surface and Cu release into solution,and the sequence of mineral *** study represents an important step for future studies to use Cu isotopes to explain Cu isotopic variations in natural rocks and waters.

关键词： Cu isotopes isotope fractionation basalt chalcopyrite leaching

High-order sliding mode attitude controller design for reentry flight

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Journal of Systems Engineering and Electronics 2014年第5期25卷 848-858页

作者： Liang Wang Yongzhi sheng Xiangdong liu School of Automation Beijing Institute of Technology Key Laboratory for Intelligent Control & Decision of Complex Systems Beijing Institute of Technology

A novel high-order sliding mode control strategy is proposed for the attitude control problem of reentry vehicles in the presence of parametric uncertainties and external disturbances, which results in the robust and accurate tracking of the aerodynamic angle commands with the finite time convergence. The proposed control strategy is developed on the basis of integral sliding mode philosophy, which combines conventional sliding mode control and a linear quadratic regulator over a finite time interval with a free-final-state and allows the finite-time establishment of a high-order sliding mode. Firstly, a second-order sliding mode attitude controller is designed in the proposed high-order siding mode control framework. Then, to address the control chattering problem, a virtual control is introduced in the control design and hence a third-order sliding mode attitude controller is developed, leading to the chattering reduction as well as the control accuracy improvement. Finally, simulation examples are given to illustrate the effectiveness of the theoretical results.

关键词： reentry vehicle attitude control high-order sliding mode control integral sliding mode.

Casimir Effect for a Massless Spin-3/2 Field in Minkowski Spacetime

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Communications in Theoretical Physics 2007年第3X期48卷 457-460页

作者： liu Wen-biao XIAO Kui ZHANG Hong-Bao Department of Physics Beijing Normal University Beijing 100875 China Department of Astronomy Beijing Normal University Beijing 100875 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China

The Casimir effect has been studied for various quantum fields in both fiat and curved spacetimes. As a further step along this line, we provide an explicit derivation of Casimlr effect for massless spin-3/2 field with periodic boundary condition imposed in four-dimensional Minkowski spacetime. The corresponding results with Dirichlet and Neumann boundary conditions are also discussed.

关键词： Casimir effect massless spin-3/2 field

An M^([X])/G/1 Retrial G-queue with Single Vacation Subject to the Server Breakdown and Repair

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Acta Mathematicae Applicatae Sinica 2013年第3期29卷 579-596页

作者： Shu-ping YANG Jin-biao WU Zai-ming liu The School of Mathematics and Statistics Central South University

An M[X]/G/1 retrial G-queue with single vacation and unreliable server is investigated in this paper. Arrivals of positive customers form a compound Poisson process, and positive customers receive service immediately if the server is free upon their arrivals; Otherwise, they may enter a retrial orbit and try their luck after a random time interval. The arrivals of negative customers form a Poisson process. Negative customers not only remove the customer being in service, but also make the server under repair. The server leaves for a single vacation as soon as the system empties. In this paper, we analyze the ergodical condition of this model. By applying the supplementary variables method, we obtain the steady-state solutions for both queueing measures and reliability quantities.

关键词： Batch arrivals in a compound poisson process G-queues retrial queues single vacation reliability