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Search Results: 1 - 10 of 12324 matches for " XIA Weisheng "
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Imminent very strong infrasonic wave precursor received before the earthquake of magnitude M=9.0, 26th Dec. 2004 of Indonesia
在2004年12月26日印尼9级地震前收到特大临震信息

LI Junzhi,CHENG Weisheng,XIA Yaqin,
李均之
,陈维升,夏雅琴

地球物理学进展 , 2006,
Abstract: Before the earthquake of M=9.0 happened on 26th,Dec.2004 in Indonesia,a very strong infrasonic sound wave with a sound press being of 16.8Pa was received on 3:22 pm,19th,Dec.2004,which shows that a great earthquake should happen in the world shortly based on our experiences.We made an informal imminent forecasting that earthquakes with magnitude greater than Ms=8.1 should occur during 19th to 28th,Dec.2004 in the world.
Schmidt Games and Nondense forward Orbits of certain Partially Hyperbolic Systems
Weisheng Wu
Mathematics , 2013,
Abstract: Let $f: M \to M$ be a partially hyperbolic diffeomorphism with conformality on unstable manifolds. Consider a set of points with nondense forward orbit: $E(f, y) := \{ z\in M: y\notin \overline{\{f^k(z), k \in \mathbb{N}\}}\}$ for some $y \in M$. Define $E_{x}(f, y) := E(f, y) \cap W^u(x)$ for any $x\in M$. Following a method of Broderick-Fishman-Kleinbock, we show that $E_x(f,y)$ is a winning set of Schmidt games played on $W^u(x)$ which implies that $E_x(f,y)$ has full Hausdorff dimension equal to $\dim W^u(x)$. Furthermore we show that for any nonempty open set $V \subset M$, $E(f, y) \cap V$ has full Hausdorff dimension equal to $\dim M$, by constructing measures supported on $E(f, y)\cap V$ with lower pointwise dimension converging to $\dim M$ and with conditional measures supported on $E_x(f,y)\cap V$. The results can be extended to the set of points with forward orbit staying away from a countable subset of $M$.
Higher rank rigidity for Berwald spaces
Weisheng Wu
Mathematics , 2015,
Abstract: We generalize the higher rank rigidity theorem to a class of Finsler spaces, i.e. Berwald spaces. More precisely, we prove that a complete connected reversible Berwald space of finite volume and bounded nonpositive flag curvature with rank at least 2 whose universal cover is irreducible is locally symmetric. Adapting the method in \cite{BBE}, \cite{BBS}, and \cite{BS2}, we will introduce an angle notion and establish a flat strip lemma, stable and unstable manifolds for the geodesic flows, Weyl Chambers and Tits Building in the sphere at infinity for the universal cover of Berwald spaces of nonpositive flag curvature.
On the ergodicity of geodesic flows on surfaces of nonpositive curvature
Weisheng Wu
Mathematics , 2013,
Abstract: Let $M$ be a smooth compact surface of nonpositive curvature, with genus $\geq 2$. We prove the ergodicity of the geodesic flow on the unit tangent bundle of $M$ with respect to the Liouville measure under the condition that the set of points with negative curvature on $M$ has finitely many connected components. Under the same condition, we prove that a non closed "flat" geodesic doesn't exist, and moreover, there are at most finitely many flat strips, and at most finitely many isolated closed "flat" geodesics.
On non-dense orbits of certain non-algebraic dynamical systems
Weisheng Wu
Mathematics , 2015,
Abstract: We show that the set of points with non-dense forward orbit under a $C^{1+\theta}$-Anosov diffeomorphism with conformality on unstable manifolds is a winning set for Schmidt games. We also show that for a $C^{1+\theta}$-expanding endomorphism the set of points with non-dense forward orbit is a winning set for certain variants of Schmidt games. These generalize some results of J. Tseng in \cite{tseng} and \cite{tseng1} for $C^2$-expanding endomorphisms on the circle and certain Anosov diffeomorphisms on the $2$-torus.
Modified Schmidt games and non-dense forward orbits of partially hyperbolic systems
Weisheng Wu
Mathematics , 2015,
Abstract: Let $f: M \to M$ be a $C^{1+\theta}$-partially hyperbolic diffeomorphism. We introduce a type of modified Schmidt games which is induced by $f$ and played on any unstable manifold. Utilizing it we generalize some results of \cite{Wu} as follows. Consider a set of points with non-dense forward orbit: $$E(f, y) := \{ z\in M: y\notin \overline{\{f^k(z), k \in \mathbb{N}\}}\}$$ for some $y \in M$ and $$E_{x}(f, y) := E(f, y) \cap W^u(x)$$ for any $x\in M$. We show that $E_x(f,y)$ is a winning set for such modified Schmidt games played on $W^u(x)$, which implies that $E_x(f,y)$ has Hausdorff dimension equal to $\dim W^u(x)$. Then for any nonempty open set $V \subset M$ we show that $E(f, y) \cap V$ has full Hausdorff dimension equal to $\dim M$, by using a technique of constructing measures supported on $E(f, y)$ with lower pointwise dimension approximating $\dim M$.
Are Yao Graph and Theta Graph Void Free?
Weisheng Si
Computer Science , 2013,
Abstract: Greedy Forwarding algorithm is a widely-used routing algorithm for wireless networks. However, it can fail if network topologies (usually modeled by geometric graphs) contain voids. Since Yao Graph and Theta Graph are two types of geometric graphs exploited to construct wireless network topologies, this paper studies whether these two types of graphs can contain voids. Specifically, this paper shows that when the number of cones in a Yao Graph or Theta Graph is less than 6, Yao Graph and Theta Graph can have voids, but when the number of cones equals or exceeds 6, Yao Graph and Theta Graph are free of voids.
阳极支撑型固体氧化物燃料电池电化学数值分析
Electrochemical numerical analysis of anode supported solid oxide fuel cell

蔡东根,蔡熊峰,杨云珍,夏卫生
CAI Donggen
,CAI Xiongfeng,YANG Yunzhen,XIA Weisheng

- , 2018,
Abstract: 根据阳极支撑平板型固体氧化物燃料电池(Solid Oxide Fuel Cell,SOFC)的工作原理,建立了SOFC的三维热流电化学模型,研究燃料电池进气方式、进气速率、燃料气组成对其温度场、燃料利用率以及电池性能的影响.结果表明,相比于反向进气方式,采用同向进气,电池温度分布更均匀,热应力更小;适当提高阴极侧空气进气速率会降低电池平均温度和热应力,同时也有利于提高电池功率密度和燃料利用率;增加燃料气的进气摩尔分数,反应速率、系统温度梯度和功率密度随之加大,由于温度梯度的增大最终导致热应力增加.
Asymptotic Behavior of Approximated Solutions to Parabolic Equations with Irregular Data
Weisheng Niu,Hongtao Li
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/312536
Abstract: Let Ω be a smooth bounded domain in ?,(≥3). We consider the asymptotic behavior of solutions to the following problem ?div(()?)
The Bondage Number of the Strong Product of a Complete Graph and a Path
Weisheng Zhao,Heping Zhang
Mathematics , 2013,
Abstract: The bondage number $b(G)$ of a graph $G$ is the cardinality of a minimum edge set whose removal from $G$ results in a graph with the domination number greater than that of $G$. It is a parameter to measure the vulnerability of a communication network under link failure. In this paper, we obtain the exact value of the bondage number of the strong product of a complete graph and a path. That is, for any two integers $m\geq1$ and $n\geq2$, $b(K_{m}\boxtimes P_{n})=\lceil\frac{m}{2}\rceil$ if $n\equiv 0$ (mod 3); $m$ if $n\equiv 2$ (mod 3); $\lceil\frac{3m}{2}\rceil$ if $n\equiv 1$ (mod 3). Furthermore, we determine the exact value of the bondage number of the strong product of a complete graph and a special starlike tree.
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