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A Novel Framework for Lim-inf Convergence in Posets

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Acta Mathematica Sinica,English Series 2022年第5期38卷 953-962页

作者： Bin ZHAO jing lu School of Mathematics and Statistics Shaanxi Normal UniversityXi'an 710119P.R.China

In this paper,we give a novel framework for lim-inf convergence in posets through the concept of T_(0) enriched closure *** precisely,we define and study Enr-convergence in T_(0) enriched closure ***,we give a suffici... 详细信息

关键词： Closure opeartor lim-inf convergence Enr-convergence enriched continuous space

Blow-Up for a Semi-linear Advection-Diffusion System with Energy Conservation

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Chinese Annals of Mathematics,Series B 2009年第4期30卷 433-446页

作者： Dapeng DU jing lu Scho of Mathematical Sciences Fudan University Shanghai 200433 China Department of Mathematics Shanghai Maritime University Shanghai 200135 China

The authors study radial solutions to a model equation for the Navier-Stokes equations. It is shown that the model equation has self-similar singular solution if 5 ≤ n ≤ 9. It is also shown that the solution will bl... 详细信息

关键词： Navier-Stokes equations Self-similar singular solutions Blow-up

Asia–Gondwana connections indicated by Devonian fishes from Australia:palaeogeographic considerations

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Journal of Palaeogeography 2020年第2期9卷 128-149页

作者： Gavin Charles Young jing lu Department of Applied Mathematics Research School of PhysicsAustralian National UniversityCanberraAustralia Australian Museum Research Institute SydneyAustralia Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology&PaleoanthropologyChinese Academy of SciencesBeijing 10004China CAS Center for Excellence in Life and Paleoenvironment Beijing 10004China.

Middle Palaeozoic vertebrate fossil occurrences are summarised for Australia, with reference to faunal connections between Asia and East Gondwana, as first indicated by fish distributions of Lower Devonian fossil sites. Major endemic groups discussed are pituriaspid(Australian) and galeaspid(Asian) agnathans, wuttagoonaspids(Australian)and antarctaspid(Antarctic, Australian, Asian) arthrodires, yunnanolepid and sinolepid antiarchs(South China,Indochina terrane, Australia), and early tetrapodomorphs(South China, Australia). More widespread groups that lived in shallow marine environments(lungfishes, buchanosteid arthrodires, antiarch Bothriolepis) also show species groups shared between South China and East Gondwana. Exchange of continental facies fishes(e.g. tristichopterid tetrapodomorphs) may have been interrupted by marine transgression in the Frasnian, but were restored in the late Famennian with the appearance of Grenfellaspis in eastern Australia, the only sinolepid antiarch known from outside Asia. The hypothesis of Gondwana dispersion and Asian accretion, to explain the collage of geological terranes forming modern east and southeast Asia, implies increasing dissimilarity with increasing age, but the SiluroDevonian early vertebrate evidence is inconsistent with this. Previous cladistic analysis of Asian terranes predicted galeaspid agnathans on the Indochina terrane, and their subsequent discovery at Ly Hoa, Vietnam, confirms that Indochina and South China had come together across the Song Ma suture by Middle Devonian time.

关键词： Devonian Palaeogeography Biogeography Vertebrates East Gondwana South China Indochina terrane

Low-thermal-budget synthesis of monolayer MoS_(2)

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Science China Materials 2024年第1期67卷 372-374页

作者： Zongmeng Yang Shibo Fang jing lu State Key Laboratory for Mesoscopic Physics and School of Physics Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Beijing Key Laboratory for Magnetoelectric Materials and Devices(BKL-MEMD) Peking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Key Laboratory for the Physics and Chemistry of Nanodevices Peking UniversityBeijing 100871China Beijing Key Laboratory of Quantum Devices Peking UniversityBeijing 100871China

Two-dimensional(2D)materials,such as MoS_(2),have been considered as a competitive coordinate for future electronics due to their excellent electrostatics and high mobility[1-3].Moreover,the potential integration of 2D materials with silicon circuits can present increased density and multifunction in future heterogeneously integrated circuits[4,5].However,the high thermal-budget during MoS_(2) synthesis exceeds the temperature requirement of direct integration with Si in the back-end-of-line(BEOL)fabrication process[6-8].

关键词： synthesis thermal MoS_(2)

CHARACTERIZATIONS ON THE THIXOTROPY-LOOP TESTS USING UCM MODEL WITH A RATE-TYPE KINETIC EQUATION

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Chinese Journal of Polymer Science 2006年第6期24卷 609-617页

作者： Shu-xin Huang Chuan-jing lu Department of Engineering Mechanics Shanghai Jiao Tong University Shanghai 200030 China

The theoretical characterizations on the triangular-form thixotropy-loop tests of an LDPE melt （PE-FSB- 23D022/Q200） were conducted in the present paper by using a new thixotropy model, which is constituted by the upper convected Maxwell model and a rate-type kinetic equation. The new thixotropic Maxwell model can partially describe well three reported thixotropy-loop experiments by comparison with the previous calculations of the variant form of the thixotropy-type Huang model. It is noted that the stress deviations between the experiments and the predictions of the new thixotropic Maxwell model are much slighter than those deviations obtained by using the variant Huang model at the same condition, although both models include five parameters. The constitution of the new thixotropic Maxwell model is more reasonable than that of the variant Huang model.

关键词： Thixotropy-loop tests Theoretical characterization Thixotropy models.

Conversion of natural gas to C_2 hydrocarbons via cold plasma technology

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Journal of Natural Gas Chemistry 2010年第4期19卷 375-379页

作者： jing lu Zhenhua Li Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

The plasma technology served as a tool in unconventional catalysis has been used in natural gas conversion,because the traditional catalytic methane oxidative coupling reaction must be performed at high temperature on account of the stability of methane *** focus of this research is to develop a process of converting methane to C2 hydrocarbons with non-equilibrium plasma technology at room temperature and atmospheric *** was found that methane conversion increased and the selectivity of C2 hydrocarbons decreased with the *** optimum input voltage range was 40-80 V corresponding to high yield of C2 *** conversion decreased and the selectivity of C2 hydrocarbons increased with the inlet flow rate of *** proper methane flow rate was 20-40 ml/min （corresponding residence time 10-20 s）.The experimental results show that methane conversion was 47% and the selectivity of C2 hydrocarbons was 40% under the proper condition using atmospheric DBD cold plasma *** was found that the breakdown voltage of methane VB was determined by the type of electrode and the discharge gap width in this glow discharge *** breakdown voltage of methane VB,min derived from the Paschen law equation was established.

关键词： methane C2 hydrocarbons plasma

Method of interference cancellation based on space-time code in MIMO interference channels

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The Journal of China Universities of Posts and Telecommunications 2015年第1期22卷 1-5页

作者： Tian Xinji lu jing School of Computer Science and Technology Henan Polytechnic University

The authors in this article investigated how to cancel multi-user interference with low feedback amount over 3-user multiple input multiple output （MIMO） interference channel using space-time code and precoders. Space-time block code with coding rate 2 was designed, also zero vectors were introduced into each codeword. The multi-user interference is mitigated by pre-coding at the transmitters and nonlinear operation and unidirectional cooperation link at the receivers. Compared with the existing scheme for the same scene, the proposed scheme greatly reduces feedback amount and improves the sum degrees of freedom （DOF）. Simulation demonstrates the validity of the proposed scheme.

关键词： MIMO interference channel space-time code pre-coding multi-user interference feedback amount DOF

Energy Scattering of a Generalized Davey–Stewartson System in Three Dimension

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Acta Mathematica Sinica,English Series 2017年第9期33卷 1206-1224页

作者： jing lu Xing Dong TANG School of Mathematical Sciences Beijing Normal UniversityBeijing 100875P.R.China Institute of Applied Physics and Computational Mathematics Beijing 100088P.R.China

In this paper, we study the global scattering result of the solution for the generalized Davey-Stewartson system The main difficulties are the failure of the interaction Morawetz estimate and the asymmetrical structure of nonlinearity （in particular, the nonlinearity is non-local）. To compensate, we utilize the strategy derived from concentration-compactness idea, which was first introduced by Kenig and Merle .

关键词： Davey-Stewartson system scatter global well-posedness

Current Oscillation and dc-Voltage-Controlled Chaotic Dynamics in Semiconductor Superlattices

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Communications in Theoretical Physics 2006年第2期45卷 363-368页

作者： WANG Chang lu jing-Tao State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology the Chinese Academy of Sciences Shanghai 200050 China

We report a detailed theoretical study of current oscillation and de-voltage-controlled chaotic dynamics in doped GaAs/AlAs resonant tunneling superlattices under crossed electric and magnetic fields. When the superlattice is biased at the negative differential velocity region, current self-oscillation is observed with proper doping concentration. The current oscillation mode and oscillation frequency can be affected by the dc voltage bias, doping density, and magnetic field. When an ac electric field with fixed amplitude and frequency is also applied to the system, different nonlinear properties show up in the external circuit with the change of dc voltage bias. We carefully study these nonlinear properties with different chaos-detecting methods.

关键词： semiconductor superlattices current oscillation chaotic dynamics