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Blockwise Empirical Likelihood Method for Spatial Dependent Data

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应用数学 2025年第1期38卷 47-63页

作者： tang jie ZOU Yunlong QIN Yongsong LI Yufang School of Statislics Beijing Normal UniversityZhuhai 519000China School of Mathematics and Statistics Guangxi Normal UniversityGuilin 541006China

Existing blockwise empirical likelihood(BEL)method blocks the observations or their analogues,which is proven useful under some dependent data *** this paper,we introduce a new BEL(NBEL)method by blocking the scoring functions under high dimensional *** study the construction of confidence regions for the parameters in spatial autoregressive models with spatial autoregressive disturbances(SARAR models)with high dimension of parameters by using the NBEL *** is shown that the NBEL ratio statistics are asymptoticallyχ^(2)-type distributed,which are used to obtain the NBEL based confidence regions for the parameters in SARAR models.A simulation study is conducted to compare the performances of the NBEL and the usual EL methods.

关键词： SARAR model Empirical likelihood Confidence region High-dimensional statistical inference

Name disambiguation in AMiner

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Science China(Information Sciences) 2021年第4期64卷 214-216页

作者： Jing ZHANG jie tang Information School Renmin University of China Department of Computer Science and Technology Tsinghua University

Name disambiguation, aiming at disambiguating who is who, is one of the fundamental problems of the online academic network platforms such as Google scholar, microsoft academic and AMiner. This study takes AMiner;), a free online academic search and mining system [1], as the example to explain how we deal with the name ambiguity problem under three different scenarios.

关键词： name disambiguation academic network graph embedding outlier detection clustering algorithm

Origin of the Yellow Sea： an insight

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Science Bulletin 2016年第14期61卷 1076-1080页

作者： Yaoling Niu jie tang Department of Earth Sciences Durham UniversityDurham DH1 3LE UK Institute of Oceanology Chinese Academy of SciencesQingdao 266071 China Qingdao National Laboratory for Marine Science and Technology (Marine Geology) Qingdao 266061 China College of Earth Sciences Jilin University Changchun 130061China

Niu et al.[1]recently show that the basement of the Chinese continental shelf(beneath East China Sea and South China Sea)is geologically unrelated to the continental lithosphere of eastern China,but is of exotic origin.

关键词：起源黄海中国东部大陆岩石圈南中国海东中国海中国大陆俯冲板块

Study of Model-free Adaptive Data-driven SMC Algorithm

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International Journal of Automation and computing 2016年第2期13卷 183-190页

作者： Wei Hu jie tang School of Electrical Engineering & Automatic Henan Polytechnic University Yima Coal Group Co. Ltd

A kind of adaptive sliding model control algorithm is developed to solve and improve the mathematical model dependency and un-modeled dynamics of a controlled system. The control strategy derived from a kind of data-driven control method in essence, thereby the input and output data are utilized by the controller with no information about the control system model. Theoretical analysis proves that this proposed control algorithm can improve the utilization of the estimated pseudo partial derivative information and accelerate the velocity of the convergence. The stability of the control system is further verified by rigorous mathematical analysis. This new discrete-time nonlinear systems model-free control algorithm obtained better control performance through the simulations for the linear motor position and the information tracking speed, which also achieved robust and accurate traceability.

关键词： Nonlinear system model-free adaptive control sliding mode control control law pseudo partial derivative

Distributional Chaos Occurring on the Set of Proper Positive Upper Banach Density Recurrent Points of One-sided Symbolic Systems

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Acta Mathematica Sinica,English Series 2020年第1期36卷 66-76页

作者： Yan jie tang Jian Dong YIN Department of Mathematics Nanchang University

The purpose of this paper is to show that for one-sided symbolic systems,there exists an uncountable distributionally scrambled set contained in the set of proper positive upper Banach density recurrent points.

关键词： Distributional chaos positive upper Banach density recurrent point one-sided symbolic system

The Global Behavior of Finite Difference-Spatial Spectral Collocation Methods for a Partial Integro-differential Equation with a Weakly Singular Kernel

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Numerical Mathematics(Theory,Methods and Applications) 2013年第3期6卷 556-570页

作者： jie tang Da Xu College of Mathematics and Computer Science Hunan Normal UniversityChangsha 410081HunanP.R.China College of Science Hunan University of TechnologyZhuzhou 412008HunanP.R.China

The z-transform is introduced to analyze a full discretization method fora partial integro-differential equation (PIDE) with a weakly singular kernel. In thismethod, spectral collocation is used for the spatial discretization, and, for the time stepping, the finite difference method combined with the convolution quadrature rule isconsidered. The global stability and convergence properties of complete discretizationare derived and numerical experiments are reported.

关键词： Partial integro-differential equation weakly singular kernel spectral collocation methods z-transform convolution quadrature

Characterization of powder flow properties from micron to nanoscale using FT4 powder rheometer and PT-X powder tester

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Particuology 2023年第4期75卷 1-10页

作者： Hui Du Haifeng Lu jie tang Haifeng Liu Shanghai Engineering Research Center of Coal Gasification East China University of Science and TechnologyShanghai200237China

The rapid development of nanotechnology has led to a need to further understand the physical char-acteristics of *** this paper,the flow characteristics of micro-nano alumina particles with different particle sizes were *** FT4 powder rheometer and the PT-X powder tester were used to measure the compression,friction,and dynamic properties of *** compressibility increased significantly as the particle size decreased from 27 μm to 30 *** distribution in the silo was measured and predicted by Janssen's theory,with errors mostly less than 10%.The basic flow energy and the specific energy of the three powders were 4983,1734,and 244 mJ,and 6.80,11.70,and 6.70 mJ/g,respectively,indicating that there was no linear relationship between the change in flowability and particle *** dynamic properties of the powders change from particle-dominated to agglomeration-dominated as the particle size *** conclusion is supported by the results of field emission scanning electron microscopy.

关键词： Micro-nano powders Flow properties Compressibility Frictional properties Pressure distribution

A Numerical Investigation on Microphysical Properties of Clouds and Precipitation over the Tibetan Plateau in Summer 2014

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Journal of Meteorological Research 2019年第3期33卷 463-477页

作者： jie tang Xueliang GUO Yi CHANG State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences China Meteorological Administration Beijing 100081 Key Laboratory for Cloud Physics of China Meteorological Administration Chinese Academy of Meteorological Sciences China Meteorological Administration Beijing 100081 Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology Nanjing 210044

In order to improve our understanding of microphysical properties of clouds and precipitation over the Tibetan Plateau (TP), six cloud and precipitation processes with different intensities during the Third Tibetan Plateau Atmospheric Science Experiment (TIPEX-Ⅲ) from 3 July to 25 July 2014 in Naqu region of the TP are investigated by using the high-resolution mesoscale Weather Research and Forecasting (WRF) model. The results show unique properties of summertime clouds and precipitation processes over the TP. The initiation process of clouds is closely associated with strong solar radiative heating in the daytime, and summertime clouds and precipitation show an obvious diurnal variation. Generally, convective clouds would transform into stratiform clouds with an obvious bright band and often produce strong rainfall in midnight. The maximum cloud top can reach more than 15 km above sea level and the velocity of updraft ranges from 10 to 40 m s-1. The simulations show high amount of supercooled water content primarily located between 0 and -20℃ layer in all the six cases. Ice crystals mainly form above the level of -20℃ and even appear above the level of -40℃ within strong convective clouds. Rainwater mostly appears below the melting layer, indicating that its formation mainly depends on the melting process of precipitable ice particles. Snow and graupel particles have the characteristics of high content and deep vertical distribution, showing that the ice phase process is very active in the development of clouds and precipitation. The conversion and formation of hydrometeors and precipitation over the plateau exhibit obvious characteristics. Surface precipitation is mainly formed by the melting of graupel particles. Although the warm cloud microphysical process has less direct contribution to the formation of surface precipitation, it is important for the formation of supercooled raindrops, which are essential for the formation of graupel embryos through heterogeneo

关键词： Tibetan Plateau numerical simulation cloud microphysics precipitation formation

Source characteristics of O_3 and CO_2 at Mt. Waliguan Observatory,Tibetan Plateau implied by using ~7Be and ^(210)Pb

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Science China Earth Sciences 2011年第4期54卷 550-560页

作者： ZHENG XiangDong WAN GuoJiang tang jie Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological Sciences Beijing 100081 China State Key Laboratory of Environment Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

The weekly averages of near-surface ^7Be, ^210pb, 03, and CO2 concentrations at the Global Atmospheric Watch Observatory, Mt. Waliguan （101.98°E, 36.287°N, 3810 m a.s.l.）, from October 2002 to January 2004 are presented. With the establishment of the new datasets of DCCW （Differential Concentrations in Contiguous Weeks） of ^7Be,^210pb, and O3, CO2 （△^7Be, △^210pb, △O3, △CO2, respectively, the impacts of upper-level downward transports and land-surface emissions on O3 and CO2 concentrations are implied by ^7Be and ^210pb being as independent tracers. The relations among △^7Be, △^210pb, and △O3, △CO2 are examined statistically and compared. The results indicate that with the DCCWs, the interferences with the tracing significance of ^7Be and ^210Pb from the seasonal wet scavenging of atmospheric aerosol are greatly reduced, and the weighting sources of O3 or CO2 variations are more pronounced. Basically, the variability of surface O3 is controlled predominately by air mass transported from the upper atmosphere levels while the emission from the Continent Boundary Layer （CBL） has an obvious input for CO2. The relation between △^210pb and △O3 reflects that influences of CBL emission are generally positive/negative for surface O3 budget in summer/winter, and the relation of △^7Be and △CO2 also reveals that upper level downward transport has positive/negative inputs for CO2 in summer/winter. With the highly correlated relations between ^7Be and O3, a quantitative estimation is made of the stratospheric contributions to the budget of surface O3 at WLG： the monthly averages of stratospheric O3 range from 6 ×10^-9 to 8 ×10^-9 （volume mixing ratio） in April and from June to August, and 2 ×10^-9 to 4 ×10^-9 in the remaining months. For the ultimate sources of the baseline concentration of surface 03, which consist of only stratospheric transport and tropospheric photochemistry production, the contribution from stratospheric transport is estimated to be about 20 ×10^-9 from May

关键词： Differential Concentrations in Contiguous Weeks (DCCW) Continent Boundary Layer (CBL) emission downward transport from stratosphere natural trace WLG