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Discussion on the relationship between the Yanshanian Movement and cratonic destruction in North China

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Science China Earth Sciences 2018年第5期61卷 499-514页

作者： Yu WANG lixin sun Liyun ZHOU Yueting XIE Institute of Earth Sciences China University of Geosciences Beijing 100083 China Tianjin Geologic Investigation Center China Geologic Survey Tianjin 300170 China

The relationship between the Yanshanian Movement, destruction of the North China Craton(NCC), and subduction of the western Pacific plate is crucial to reconstructing the middle-late Mesozoic tectonic evolution of the eastern Asian continent and margin. The Yanshanian Movement was a globally important change in crustal tectonics during the Middle-Late *** research has systematically studied the formation and evolution of the Yanshanian Movement, focusing on the timing and location of tectonic movements, and the sedimentary and volcanic strata. However, the question of whether the tectonic activity occurred globally, and the characteristics of the Yanshanian Movement remain debated. The main argument is that if a tectonic movement can only be characterized by a regional or local disconformity, and if the tectonic movement occurred in an intracontinental setting, with extensive deformation but with no disconformity despite volcanic eruptions and magmatic intrusions, accompanied by changes in crustal structure and composition, should it be defined as a tectonic event or process? This question requires further analysis. The main aim of this study is to distinguish whether the Yanshanian Movement is a local feature of the eastern Asian continent, or a global tectonic event related to subduction of the Pacific Plate. In this paper, based on previous research, we discuss the spatial and temporal evolution of the Yanshanian Movement, the controlling tectonic mechanisms, and its relationship to the reactivation and destruction of the NCC and the subduction of the western Paleo-Pacific *** emphasize that the Yanshanian Movement in the Middle-Late Jurassic is distinct from the lithospheric thinning responsible for Early Cretaceous extension and magmatism related to the destruction of the NCC. The various tectonic stages were constrained by different dynamics and tectonic settings, or by different tectonic events and processes. Therefore, it is possible that t

关键词： Yanshanian Movement North China Craton destruction Paleo-Pacific Plate subduction Intracontinental deformation Layered crustal rotation

Heuristic based data scheduling algorithm for OFDMA wireless network

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Journal of Systems Engineering and Electronics 2008年第1期19卷 46-51页

作者： Guo Kunqi sun lixin Jia Shilou Yu Xiaoyang Communication Research Center Harbin Inst. of Technology Harbin 150001 P. R. China Communication Engineering School Harbin Univ. of Science and Technology Harbin 150052 P. R. China

A system model based on joint layer mechanism is formulated for optimal data scheduling over fixed point-to-point links in OFDMA ad-hoc wireless networks. A distributed scheduling algorithm （DSA） for system model optimization is proposed that combines the randomly chosen subcarrier according to the channel condition of local subcarriers with link power control to limit interference caused by the reuse of subcarrier among links. For the global fairness improvement of algorithms, a global power control scheduling algorithm （GPCSA） based on the proposed DSA is presented and dynamically allocates global power according to difference between average carrier-noise-ratio of selected local links and system link protection ratio. Simulation results demonstrate that the proposed algorithms achieve better efficiency and fairness compared with other existing algorithms.

关键词： orthogonal frequency division multiplexing access (OFDMA) scheduling algorithm ad-hoc

Bayesian force fields from active learning for simulation of inter-dimensional transformation of stanene

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npj Computational Materials 2021年第1期7卷 361-370页

作者： Yu Xie Jonathan Vandermause lixin sun Andrea Cepellotti Boris Kozinsky John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMAUSA Robert Bosch LLC Research and Technology CenterCambridgeMAUSA

We present a way to dramatically accelerate Gaussian process models for interatomic force fields based on many-body kernels by mapping both forces and uncertainties onto functions of low-dimensional *** allows for automated active learning of models combining near-quantum accuracy,built-in uncertainty,and constant cost of evaluation that is comparable to classical analytical models,capable of simulating millions of *** this approach,we perform large-scale molecular dynamics simulations of the stability of the stanene *** discover an unusual phase transformation mechanism of 2D stanene,where ripples lead to nucleation of bilayer defects,densification into a disordered multilayer structure,followed by formation of bulk liquid at high temperature or nucleation and growth of the 3D bcc crystal at low *** presented method opens possibilities for rapid development of fast accurate uncertainty-aware models for simulating long-time large-scale dynamics of complex materials.

关键词： transformation dimensional fields

Comparisons of Metrics on Teichmller Space

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Chinese Annals of Mathematics,Series B 2010年第1期31卷 71-84页

作者： Zongliang sun lixin LIU Department of Mathematics Suzhou UniversitySuzhou 215006 JiangsuChina Department of Mathematics Zhongshan University Guangzhou 510275 China

For a Riemann surface X of conformally finite type （g, n）, let dT, dL and dpi （i = 1, 2） be the Teichmuller metric, the length spectrum metric and Thurston＇s pseudometrics on the Teichmutler space T（X）, respectively. The authors get a description of the Teichmiiller distance in terms of the Jenkins-Strebel differential lengths of simple closed curves. Using this result, by relatively short arguments, some comparisons between dT and dL, dpi （i = 1, 2） on Tε（X） and T（X） are obtained, respectively. These comparisons improve a corresponding result of Li a little. As applications, the authors first get an alternative proof of the topological equivalence of dT to any one of dL, dp1 and dp2 on T（X）. Second, a new proof of the completeness of the length spectrum metric from the viewpoint of Finsler geometry is given. Third, a simple proof of the following result of Liu-Papadopoulos is given： a sequence goes to infinity in T（X） with respect to dT if and only if it goes to infinity with respect to dL （as well as dpi （i = 1, 2））.

关键词： Length spectrum metric Teichmuller metric Thurston's pseudo-metrics

Efficiency-aware and fairness-aware joint-layer optimization for downlink data scheduling in OFDM

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Science in China(Series F) 2008年第2期51卷 171-182页

作者： GUO KunQi sun lixin WANG Ping JIA ShiLou Shanghai Research Center for Wireless Communications Shanghai Institute of Microsystem and Infor- mation Technology Chinese Academy of Sciences Shanghai 200050 China School of Measurement & Control Technology and Communication Engineering Harbin University of Science and Technology Harbin 150080 China Communication Research Center Harbin Institute of Technology Harbin 150001 China

Efficiency and fairness are two crucial issues to be considered for resource alloca- tion in multi-user wireless networks. Based on the joint optimization of physical layer and data link layer, an optimization model is derived to achieve efficient and fair downlink data scheduling in multi-user OFDM wireless networks by maximizing the total utility function with respect to the average waiting time of user queue. A dynamic sub-carrier allocation algorithm （DSAA） based on the optimization model is proposed in order to obtain the maximization of the total scheduling utility. Effi- ciency is improved by combining DSAA with time scale interference predictor （TSIP） which at large time scales predict ON/OFF period of user data with temporal corre- lation structure across multiple time scales in multi-user interference environment. Simulation results verify the efficiency and fairness of the scheme.

关键词： OFDM efficiency and fairness joint-layer scheduling utility function

Effects of antibiotic antitumor drugs on nucleotide levels in cultured tumor cells:an exploratory method to distinguish the mechanisms of antitumor drug action based on targeted metabolomics

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Acta Pharmaceutica Sinica B 2015年第3期5卷 223-230页

作者： Fang Wang Xi Liu Cuichai Liu Zheng Liu lixin sun School of Pharmacy Shenyang Pharmaceutical University School of Life Science and Bio-pharmaceutics Shenyang Pharmaceutical University

Nucleotide pools in mammalian cells change due to the influence of antitumor drugs,which may help in evaluating the drug effect and understanding the mechanism of drug *** this study,an ion-pair RP-HPLC method was used for a simple,sensitive and simultaneous determination of the levels of 12 nucleotides in mammalian cells treated with antibiotic antitumor drugs(daunorubicin,epirubicin and dactinomycin D).Through the use of this targeted metabolomics approach to find potential biomarkers,UTP and ATP were verified to be the most appropriate ***,a holistic statistical approach was put forward to develop a model which could distinguish 4 categories of drugs with different mechanisms of *** model can be further validated by evaluating drugs with different mechanismsof *** targeted metabolomics study may provide a novel approach to predict the mechanism of action of antitumor drugs.

关键词： Nucleotides Targeted metabolomics analysis Tumor cells Potential biomarkers Mechanisms of antitumor drug action

Four Methods to Estimate Minimum Miscibility Pressure of CO2-Oil Based on Machine Learning

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Chinese Journal of Chemistry 2019年第12期37卷 1271-1278页

作者： Ding Li Xiangliang Li Yinghua Zhang lixin sun Shiling Yuan Key Lab of Colloid and Interface Chemistry Shandong UniversityJinanShandong 250100China Shengli Oil Field Exploration and Development Research Institute DongyingShandong 257000China

Summary of main observation and conclusion CO2 flooding accounts for a considerable proportion in gas *** CO2 as a gas displacement agent is benefit for enhanced oil recovery(EOR),and the alleviation of the greenhouse effect by the permanent storage of CO2 in the *** miscibility pressure(MMP)of CO2-oil is a key factor affecting EOR,which determines the yield and economic benefit of crude oil ***,it is of great importance to use fast,accurate and cheap prediction methods for MMP *** the present study,to evaluate the reliability of four recently developed prediction models based on machine learning(i.e.,neural network analysis(NNA),genetic function approximation(GFA),multiple linear regression(MLR),partial least squares(PLS)),136 sets of data are selected for calculation via outlier analysis from 147 sets of ***,we compared the four models with existing prediction models from the *** analysis of correlation coefficients and multiple error functions shows that the four models can solve the MMP prediction problem well,and the model using intelligent algorithm has a higher prediction accuracy than the simple linear ***,intelligent methods based on similarity algorithm have little difference from each ***,a sensitivity analysis was conducted.

关键词： prediction analysis similarity

Hantzsch Ester Modified Asymmetric BODIPY Probe with Ultra-high Sensitivity for Ultra-fast Detection of Endogenous Hypochlorite in Living Cells

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Chinese Journal of Chemistry 2023年第23期41卷 3319-3325页

作者： Tianli Zhu Mengting Zhao Rongcheng Wang Chenjun Dong Xuemei Dong Jie sun lixin sun Chunchang Zhao Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Institute of Fine ChemicalsSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237 China

Hypochlorite(ClO^(-))is an important reactive oxygen species produced by the immune system to fight off invading pathogens,but its over-expression can interfere with normal physiological process and induce serious *** a variety of molecular probes have been reported for detecting ClO^(-),the development of advanced fluorescent tools with faster response and higher sensitivity to precisely monitor ClO^(-)remains a *** this work,two Hantzsch ester(a derivative of 1,4-dihydropyridine)derived fluorescent probes MeDHP-BCl and MeDHP-PhBCl were constructed based on asymmetric *** probes exhibit significant fluorescence turn-on in the ultra-sensitive(detection limit<1 nmol/L)and ultra-fast response(≤5 s)to ClO^(-).The reaction has been determined to be a highly selective N-chlorination of Hantzsch ester which cannot be activated by various common bioactive species,including nitric oxide(NO)that could oxidize Hantzsch ester under aerobic physiological conditions in most ***-PhBCl possessed a relatively longer fluorescence emission wavelength and higher quantum yield after activation,while more notably,MeDHP-BCl displayed lower cytotoxicity and more remarkable fluorescence increment in the response to ClO^(-),enabling selective and precise visualization of endogenous ClO^(-)over-expression in living RAW264.7 cells.

关键词： Hypochlorite Hantzsch ester BODIPY Fluorescent probes Fluorescence spectroscopy Biomarkers Biosensors Bioimaging

The Influence of Two Natural Reinforcement Fibers on the Hygrothermal Properties of Earthen Plasters in Mogao Grottoes of China

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Journal of Renewable Materials 2020年第12期8卷 1691-1710页

作者： Wenbei Bi Zengfeng Yan Huan Zhao lixin sun Xudong Wang Zhengmo Zhang School of Architecture Xi’an University of Architecture and TechnologyXi’an710055China China Academy of Building Research Beijing100044China Conservation Institute Dunhuang AcademyDunhuang736200China School of Engineering and Mechanics Lanzhou UniversityLanzhou730000China

Murals in Mogao Grottoes consist of three parts:support layer,earthen plasters and paint *** earthen plasters play a key role in the preservation of *** is a mixture of Dengban soil,sand,and plant *** different natural fibers,hemp fiber and cotton fiber,were reinforced to earthen plasters in the same percentage to evaluate the influence on hygrothermal *** two types of earthen plasters were studied:one containing hemp fiber in the fine plaster(HFP)and the other containing cotton fiber in the fine plaster(CFP).Specific heat capacity,dry thermal conductivity,water vapor permeability,and sorption isotherms were *** results showed that the difference between two natural fibers has much more impact on the hygric properties(water vapor permeability and sorption isotherms)of earthen plasters than on their thermal performance(specific heat capacity and dry thermal conductivity).The CFP with higher density has higher thermal conductivity than the HFP with lower *** no significant differences of specific heat capacity were *** with HFP,CFP used in murals can reduce the rate of water transfer and prevent salt from transferring water to the mural *** overall findings highlight that all these features of CFP are beneficial to the long-term preservation of mur*** study of the earthen plasters in Mogao Grottoes is of general significance,and the measured properties can be used to obtain coupled heat and moisture analysis of the earthen plasters and to dissect the degradation mechanism of murals.

关键词： Earthen plasters natural reinforced fibers hygrothermal properties dry thermal conductivity water vapor permeability sorption isotherms