检索结果-南通市图书馆

Regularity Condition of Solutions to the Quasi-geostrophic Equations in Besov Spaces with Negative Indices

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2010年第3期26卷 381-386页

作者： bao-quan Yuan School of Mathematics and Information Science Henan Polytechnic University Henan 454000 China

With a Hǒlder type inequality in Besov spaces, we show that every strong solution θ（t, x） on （0, T ） of the dissipative quasi-geostrophic equations can be continued beyond T provided that ⊥θ（t, x） ∈L 2γ/... 详细信息

关键词： Quasi-geostrophic equations regularity conditions Besov spaces

CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第01期 522-532页

作者： Jin-Peng Wang Guo-Cui Mao Hui-Lin Jiang bao-Xia Dong Yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

关键词：

The Compressibility of Checkerboard Surfaces of Link Diagrams

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第10期23卷 1845-1858页

作者： Zhi Qiang bao LMAM School of Mathematical Sciences Peking University Beijing 100871 P. R. China

Consider the checkerboard surfaces defined by some link diagrams. When they are not orientable, one considers the boundary surfaces of small regular neighborhoods of them. This article studies the compressibility problem of these kinds of surfaces in the link complements. The problem is solved by devising a normalization theory for the compressing discs, which brings up an algorithm to read out compressibility directly from the link diagrams. As an application of the algorithm, the compressibility changes under Reidermeister moves are studied. Diagrams from the knot tables are also studied, and surprisingly, some of them are shown to define completely compressible surfaces of this kind. Infinitely many examples of non-alternating knot diagrams with incompressible surfaces of this kind are also constructed.

关键词： compressibility checkerboard surface knot diagram

The Dissipative Quasi-geostrophic Equation in Weak Morrey Spaces

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2008年第2期24卷 253-266页

作者： bao Quan YUAN School of Mathematics and Informatics He'nan Polytechnic University Jiaozuo 454000 P. R. China

The author studies the Cauchy problem of the dissipative quasi-geostrophic equation in weak Morrey spaces. The global well-posedness is established for any small initial data in the weak space Mp^＊,γ（R^n）, with 1... 详细信息

关键词： dissipative quasi-geostrophic equation weak Morrey spaces global well-posedness

Invariant Measure for the Markov Process Corresponding to a PDE System

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2005年第3期21卷 457-464页

作者： Fu bao XI Department of Mathematics Beijing Institute of Technology Beijing 100081 P. R. China

In this paper, we consider the Markov process （X^∈（t）, Z^∈（t）） corresponding to a weakly coupled elliptic PDE system with a small parameter ∈ 〉 0. We first prove that （X^∈（t）, Z^∈（t）） has the Feller continuity by the coupling method, and then prove that （X^∈（t）, Z^∈（t）） has an invariant measure μ^∈（·） by the Foster-Lyapunov inequality. Finally, we establish a large deviations principle for μ^∈（·） as the small parameter e tends to zero.

关键词： Feller continuity Coupling Invariant measure Foster-Lyapunov inequality Large deviations

Memristive neuron model with an adapting synapse and its hardware experiments

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2021年第5期64卷 1107-1117页

作者： bao BoCheng ZHU YongXin MA Jun bao Han WU HuaGan CHEN Mo School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China Department of Physics Lanzhou University of TechnologyLanzhou 730050China

Electromagnetic induction effect caused by neuron potential can be mimicked using *** paper considers a fluxcontrolled memristor to imitate the electromagnetic induction effect of adapting feedback synapse and presents a memristive neuron model with the adapting *** memristive neuron model is three-dimensional and *** has the time-varying equilibria with multiple stabilities,which results in the global coexistence of multiple firing *** numerical plots are executed to uncover diverse coexisting firing patterns in the memristive neuron ***,a nonlinear fitting scheme is raised and a fitting activation function circuit is employed to implement the memristive mono-neuron *** coexisting firing patterns are observed from the hardware experiment circuit and the measured results verify the numerical simulations well.

关键词： memristor neuron model coexisting firing patterns nonlinear fitting scheme hardware experiment

Hybrid tri-memristor hyperchaotic map and application in Wasserstein Generative Adversarial Nets

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2024年第6期67卷 1855-1865页

作者： GU Yang bao Han YU XiHong HUA ZhongYun bao BoCheng XU Quan School of Microelectronics and Control Engineering Changzhou UniversityChangzhou213159China School of Computer Science and Technology Harbin Institute of TechnologyShenzhen518055China

Inspired by basic circuit connection methods,memristors can also be utilized in the construction of complex discrete chaotic *** investigate the dynamical effects of hybrid memristors,we propose two hybrid tri-memristor hyperchaotic(HTMH)mapping structures based on the hybrid parallel/cascade and cascade/parallel operations,*** the HTMH mapping structure with hybrid parallel/cascade operation as an example,this map possesses a spatial invariant set whose stability is closely related to the initial states of the *** distributions and bifurcation behaviours dependent on the control parameters are explored with numerical ***,the memristor initial offset-boosting mechanism is theoretically demonstrated,and memristor initial offset-boosting behaviours are numerically *** results clarify that the HTMH map can exhibit hyperchaotic behaviours and extreme multistability with homogeneous coexisting infinite *** addition,an FPGA hardware platform is fabricated to implement the HTMH map and generate pseudorandom numbers(PRNs)with high ***,the generated PRNs can be applied in Wasserstein generative adversarial nets(WGANs)to enhance training stability and generation capability.

关键词： memristor hybrid tri-memristor map spatial invariant set hyperchaos extreme multistability generative adversarial nets

Global warming strengthens the association between ENSO and the Asian-Australian summer monsoon

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第1期67卷 309-312页

作者： bao YANG Minhui HE School of Geography and Ocean Science Nanjing UniversityNanjing 210093China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Previous studies have widely reported the linkages between Asian-Australian monsoon and the ENSO(Wu,2008;Azad and Rajeevan,2016;Chen et al.,2020;Shekhar et al.,2022;Zhang J et al.,2022;Chen et al.,2023;Hau et al.,2023;Heidemann et al.,2023).It is well accepted that the monsoon is weaker during the El Niño phase and stronger during the La Niña *** example,an anomalously strong western Pacific subtropical high in 2020,related to the La Niña event.

关键词： event monsoon Asian

Intensity Evolution of Zonal Shear Line over the Tibetan Plateau in Summer:A Perspective of Divergent and Rotational Kinetic Energies

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2022年第7期39卷 1021-1033页

作者： Xiaohong bao Xiuping YAO State Key Laboratory on Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China China Meteorological Administration Training Centre Beijing 100081China

Based on the ERA5 reanalysis datasets during 1980-2019,a total of eleven zonal shear lines(ZSLs)that caused heavy precipitation and lasted more than 60 hours over the Tibetan Plateau in summer are selected for composite *** decomposing the kinetic energy(K)near the ZSL into divergent and rotational kinetic energies(K_(D)and K_(R))and the kinetic energy of interaction between the divergent wind and the rotational wind(K_(R)D),the influence of the rotational and divergent winds on the evolution of the ZSL intensity is investigated from the perspective of K_(D)and K_(R).The main results are as *** ZSL is a comprehensive reflection of rotation and *** intensity evolution of ZSL is essentially synchronized with those of K,K_(R),and K_(RD)but lags behind K_(D)by about three *** enhancement of K is mainly contributed by K_(R),which is governed by the conversion from K_(D)to K_(R).Furthermore,the increase in the conversion from K_(D)to K_(R)is controlled by the geostrophic effect term Af,which is determined by the joint enhancement of the zonal rotational and meridional divergent wind components(u_(R)and v_(D)).Therefore,the joint enhancement of u_(R)and v_(D)controls the increase of the ZSL intensity,leading to increased precipitation.

关键词： zonal shear line over the Tibetan Plateau intensity evolution divergent and rotational kinetic energies joint action of the zonal rotational and meridional divergent wind components