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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

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

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

Subduction history of the Paleo-Pacific slab beneath Eurasian continent: Mesozoic-Paleogene magmatic records in Northeast Asia

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Science China Earth Sciences 2018年第5期61卷 527-559页

作者： jie tang Wenliang XU Feng WANG Wenchun GE College of Earth Sciences Jilin University Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Land and Resources of China

This paper presents a review on the rock associations, geochemistry, and spatial distribution of Mesozoic-Paleogene igneous rocks in Northeast Asia. The record of magmatism is used to evaluate the spatial-temporal extent and influence of multiple tectonic regimes during the Mesozoic, as well as the onset and history of Paleo-Pacific slab subduction beneath Eurasian continent. Mesozoic-Paleogene magmatism at the continental margin of Northeast Asia can be subdivided into nine stages that took place in the Early-Middle Triassic, Late Triassic, Early Jurassic, Middle Jurassic, Late Jurassic, early Early Cretaceous, late Early Cretaceous, Late Cretaceous, and Paleogene, respectively. The Triassic magmatism is mainly composed of adakitic rocks,bimodal rocks, alkaline igneous rocks, and A-type granites and rhyolites that formed in syn-collisional to post-collisional extensional settings related to the final closure of the Paleo-Asian Ocean. However, Triassic calc-alkaline igneous rocks in the Erguna-Xing'an massifs were associated with the southward subduction of the Mongol-Okhotsk oceanic slab. A passive continental margin setting existed in Northeast Asia during the Triassic. Early Jurassic calc-alkaline igneous rocks have a geochemical affinity to arc-like magmatism, whereas coeval intracontinental magmatism is composed of bimodal igneous rocks and A-type granites. Spatial variations in the potassium contents of Early Jurassic igneous rocks from the continental margin to intracontinental region, together with the presence of an Early Jurassic accretionary complex, reveal that the onset of the PaleoPacific slab subduction beneath Eurasian continent occurred in the Early Jurassic. Middle Jurassic to early Early Cretaceous magmatism did not take place at the continental margin of Northeast Asia. This observation, combined with the occurrence of low-altitude biological assemblages and the age population of detrital zircons in an Early Cretaceous accretionary complex,indica

关键词： Continental margin of Northeast Asia Mesozoic-Paleogene Igneous rocks Paleo-Pacific slab Subduction

Diffusion of municipal wastewater treatment technologies in China： a collaboration network perspective

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Frontiers of Environmental Science & Engineering 2017年第1期11卷 111-121页

作者： Yang Li Lei Shi Yi Qian jie tang State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China Department of Computer Science and Technology Tsinghua University Beijing 100084 China

The diffusion of municipal wastewater treatment technology is vital for urban environment in developing countries. China has built more than 3000 municipal wastewater treatment plants in the past three decades, which is a good chance to understand how technologies diffused in reality. We used a data-driven approach to explore the relationship between the diffusion of wastewater treatment technologies and collaborations between organizations. A database of 3136 municipal wastewater treatment plants and 4634 collaborating organizations was built and transformed into networks for analysis. We have found that： 1）.the diffusion. networks are assortative, arid the .pattems of diffusion vary across technologies; while the collaboration networks are fragmented, and have an assortativity around zero since the 2000s. 2） Important projects in technology diffusion usually involve central organizations in collaboration networks, but organizations become more central in collaboration by doing circumstantial projects in diffusion. 3）The importance of projects in diffusion can be predicted with a Random Forest-model at a good accuracy and precision level. Our findings provide a quantitative understanding of the technology diffusion processes, which could be used for waterrelevant policy-making and business decisions.

关键词： Innovation diffusion Collaboration network Wastewater treatment plant Complex network Data driven