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Search Results: 1 - 10 of 8883 matches for " Jiaping Gu "
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Discussion about Resolving Excess Capacity in Steel Industry  [PDF]
Jiaping Xiong
Journal of Service Science and Management (JSSM) , 2017, DOI: 10.4236/jssm.2017.102014
Abstract: Overcapacity in Chinas steel industry and the resulting problems of lower profits, even losses and bankruptcy in iron and steel enterprises are serious. This paper summarizes the causes of overcapacity in the steel industry from three aspects of market factors, government factors and the mix of market and government factors. As the traditional method of demand-side management to resolve the excess capacity having been in trouble, this paper discusses the way to reasonably resolve the excess capacity of the steel industry from the aspect of structural reform of supply-side.
Study on the Spillover Effect of Tourism Flow Based on the Customer Market Segmentation—Take the Business Travel Market in Guangdong Province as an Example  [PDF]
Yi Liu, Jiaping Lin
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.95064
Abstract: In the open economic system, the factors that affect the development of regional tourism are more influenced by the level of tourism development in other regions, and show the spatial spillover effect of tourism activities. In this paper, the problem of the spillover effect of tourist flows based on customer market segmentation is solved. Through this study, the following conclusions are drawn: there is a significant spatial spillover effect on the overall tourism flow of the business tourist market in Guangdong province, but the spillover effect is negative, which is represented by the competition substitution effect. The tourism development of different cities in Guangdong province is similar to that of tourism development. The tourism flow of business tourists in Guangdong province has distinctive features and purpose.
Inhibition of AMPA receptor trafficking at hippocampal synapses by β-amyloid oligomers: the mitochondrial contribution
Yanfang Rui, Jiaping Gu, Kuai Yu, H Criss Hartzell, James Q Zheng
Molecular Brain , 2010, DOI: 10.1186/1756-6606-3-10
Abstract: We found that a brief exposure of hippocampal neurons to Aβ oligomers not only led to marked removal of AMPARs from postsynaptic surface but also impaired rapid AMPAR insertion during chemically-induced synaptic potentiation. We also found that Aβ oligomers exerted acute impairment of fast mitochondrial transport, as well as mitochondrial translocation into dendritic spines in response to repetitive membrane depolarization. Quantitative analyses at the single spine level showed a positive correlation between spine-mitochondria association and the surface accumulation of AMPARs. In particular, we found that spines associated with mitochondria tended to be more resistant to Aβ inhibition on AMPAR trafficking. Finally, we showed that inhibition of GSK3β alleviated Aβ impairment of mitochondrial transport, and effectively abolished Aβ-induced AMPAR loss and inhibition of AMPAR insertion at spines during cLTP.Our findings indicate that mitochondrial association with dendritic spines may play an important role in supporting AMPAR presence on or trafficking to the postsynaptic membrane. Aβ disruption of mitochondrial trafficking could contribute to AMPAR removal and trafficking defects leading to synaptic inhibition.Alzheimer's disease (AD) often attacks aged populations and is highlighted by progressive loss of memory and cognitive abilities [4]. AD brains exhibit two major pathological hallmarks: extracellular senile plaques containing β-amyloid aggregates and intracellular neurofibrillary tangles consisting of hyperphosphorylated microtubule-associated tau proteins [5,6]. β-amyloid (Aβ) molecules are generated by proteolytic cleavage of the transmembrane β-amyloid precursor protein (APP) [7,8]. Aggregated Aβ fibrils constitute the core of neuritic plaques and are believed to be a major culprit for neurodegeneration and subsequent cognitive abnormalities in AD patients [9-11]. Recent studies, however, indicate that Aβ molecules exert adverse effects on neuronal functions
Connectedness at infinity of complete K?hler manifolds and locally symmetric spaces
Peter Li,Jiaping Wang
Mathematics , 2007,
Abstract: One of the main purposes of this paper is to prove that on a complete K\"ahler manifold of dimension $m$, if the holomorphic bisectional curvature is bounded from below by -1 and the minimum spectrum $\lambda_1(M) \ge m^2$, then it must either be connected at infinity or diffeomorphic to $\Bbb R \times N$, where $N$ is a compact quotient of the Heisenberg group. Similar type results are also proven for irreducible, locally symmetric spaces of noncompact type. Generalizations to complete K\"ahler manifolds satisfying a weighted Poincar\'e inequality are also being considered
Weighted Poincaré inequality and rigidity of complete manifolds
Peter Li,Jiaping Wang
Mathematics , 2007,
Abstract: We prove structure theorems for complete manifolds satisfying both the Ricci curvature lower bound and the weighted Poincar\'e inequality. In the process, a sharp decay estimate for the minimal positive Green's function is obtained. This estimate only depends on the weight function of the Poincar\'e inequality, and yields a criterion of parabolicity of connected components at infinity in terms of the weight function.
Smooth metric measure spaces with non-negative curvature
Ovidiu Munteanu,Jiaping Wang
Mathematics , 2011,
Abstract: We study both function theoretic and spectral properties on complete noncompact smooth metric measure space $(M,g,e^{-f}dv)$ with nonnegative Bakry-\'{E}mery Ricci curvature. Among other things, we derive a gradient estimate for positive $f$-harmonic functions and obtain as a consequence the strong Liouville property under the optimal sublinear growth assumption on $f.$ We also establish a sharp upper bound of the bottom spectrum of the $f$-Laplacian in terms of the linear growth rate of $f.$ Moreover, we show that if equality holds and $M$ is not connected at infinity, then $M$ must be a cylinder. As an application, we conclude steady Ricci solitons must be connected at infinity.
Geometry of manifolds with densities
Ovidiu Munteanu,Jiaping Wang
Mathematics , 2012,
Abstract: We study geometry of complete Riemannian manifolds endowed with a weighted measure, where the weight function is of quadratic growth. Assuming the associated Bakry-Emery curvature is bounded from below, we derive a new Laplacian comparison theorem and establish various sharp volume upper and lower bounds. We also obtain some splitting type results by analyzing the Busemann functions. In particular, we show that a complete manifold with nonnegative Bakry-Emery curvature must split off a line if it is not connected at infinity and its weighted volume entropy is of maximal value among linear growth weight functions. While some of our results are even new for the gradient Ricci solitons, the novelty here is that only a lower bound of the Bakry-Emery curvature is involved in our analysis.
Holomorphic functions on certain K?hler manifolds
Ovidiu Munteanu,Jiaping Wang
Mathematics , 2013,
Abstract: We investigate Liouville theorems and dimension estimates for the space of exponentially growing holomorphic functions on complete K\"{a}hler manifolds. While our work is motivated by the study of gradient Ricci solitons in the theory of Ricci flow, the most general results we prove here do not require any knowledge of curvature.
Topology of Kahler Ricci solitons
Ovidiu Munteanu,Jiaping Wang
Mathematics , 2013,
Abstract: We prove that any shrinking Kahler Ricci soliton has only one end, and that any expanding Kahler Ricci soliton with proper potential has only one end.
Kahler manifolds with real holomorphic vector fields
Ovidiu Munteanu,Jiaping Wang
Mathematics , 2015,
Abstract: For a K\"{a}hler manifold endowed with a weighted measure $e^{-f}\,dv,$ the associated weighted Hodge Laplacian $\Delta _{f}$ maps the space of $(p,q)$-forms to itself if and only if the $(1,0)$-part of the gradient vector field $\nabla f$ is holomorphic. We use this fact to prove that for such $f$, a finite energy $f$ harmonic function must be pluriharmonic. Motivated by this result, we verify that the same also holds true for $f$-harmonic maps into a strongly negatively curved manifold. Furthermore, we demonstrate that such $f$-harmonic maps must be constant if $f$ has an isolated minimum point. In particular, this implies that for a compact K\"{a}hler manifold admitting such a function, there is no nontrivial homomorphism from its first fundamental group into that of a strongly negatively curved manifold.
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