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Search Results: 1 - 10 of 12857 matches for " Jiangang Yao "
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On the realizations of high dimensional solenoids as attractors and as non-wondering sets
Fan Ding,Shicheng Wang,Jiangang Yao
Mathematics , 2007,
Abstract: This paper will be splited into two papers and submited later.
On embedding all $n$-manifolds into a single $(n+1)$-manifold
Fan Ding,Shicheng Wang,Jiangang Yao
Mathematics , 2005,
Abstract: For each composite number $n\ne 2^k$, there does not exist a single connected closed $(n+1)$-manifold such that any smooth, simply-connected, closed $n$-manifold can be topologically flat embedded into it. There is a single connected closed 5-manifold $W$ such that any simply-connected, 4-manifold $M$ can be topologically flat embedded into $W$ if $M$ is either closed and indefinite, or compact and with non-empty boundary.
Only rational homology spheres admit $Ω(f)$ to be union of DE attractors
Fan Ding,Jianzhong Pan,Shicheng Wang,Jiangang Yao
Mathematics , 2008,
Abstract: If there exists a diffeomorphism $f$ on a closed, orientable $n$-manifold $M$ such that the non-wandering set $\Omega(f)$ consists of finitely many orientable $(\pm)$ attractors derived from expanding maps, then $M$ must be a rational homology sphere; moreover all those attractors are of topological dimension $n-2$. Expanding maps are expanding on (co)homologies.
Extending $T^p$ automorphisms over $\RR^{p+2}$ and realizing DE attractors
Fan Ding,Yi Liu,Shicheng Wang,Jiangang Yao
Mathematics , 2008,
Abstract: In this paper we consider the realization of DE attractors by self-diffeomorphisms of manifolds. For any expanding self-map $\phi:M\to M$ of a connected, closed $p$-dimensional manifold $M$, one can always realize a $(p,q)$-type attractor derived from $\phi$ by a compactly-supported self-diffeomorphsm of $\RR^{p+q}$, as long as $q\geq p+1$. Thus lower codimensional realizations are more interesting, related to the knotting problem below the stable range. We show that for any expanding self-map $\phi$ of a standard smooth $p$-dimensional torus $T^p$, there is compactly-supported self-diffeomorphism of $\RR^{p+2}$ realizing an attractor derived from $\phi$. A key ingredient of the construction is to understand automorphisms of $T^p$ which extend over $\RR^{p+2}$ as a self-diffeomorphism via the standard unknotted embedding $\imath_p:T^p\hookrightarrow\RR^{p+2}$. We show that these automorphisms form a subgroup $E_{\imath_p}$ of $\Aut(T^p)$ of index at most $2^p-1$.
Spin structures and codimension-two homeomorphism extensions
Fan Ding,Yi Liu,Shicheng Wang,Jiangang Yao
Mathematics , 2009,
Abstract: Let $\imath: M\to \RR^{p+2}$ be a smooth embedding from a connected, oriented, closed $p$-dimesional smooth manifold to $\RR^{p+2}$, then there is a spin structure $\imath^\sharp(\varsigma^{p+2})$ on $M$ canonically induced from the embedding. If an orientation-preserving diffeomorphism $\tau$ of $M$ extends over $\imath$ as an orientation-preserving topological homeomorphism of $\RR^{p+2}$, then $\tau$ preserves the induced spin structure. Let $\esg_\cat(\imath)$ be the subgroup of the $\cat$-mapping class group $\mcg_\cat(M)$ consisting of elements whose representatives extend over $\RR^{p+2}$ as orientation-preserving $\cat$-homeomorphisms, where $\cat=\topo$, $\pl$ or $\diff$. The invariance of $\imath^\sharp(\varsigma^{p+2})$ gives nontrivial lower bounds to $[\mcg_\cat(M):\esg_\cat(\imath)]$ in various special cases. We apply this to embedded surfaces in $\RR^4$ and embedded $p$-dimensional tori in $\RR^{p+2}$. In particular, in these cases the index lower bounds for $\esg_\topo(\imath)$ are achieved for unknotted embeddings.
A Study on Credit Appraisal System of C2C E-Commerce
—Based on the Analysis of Taobao
 [PDF]

Jiangang Pang, Zhiying Liu
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.412078
Abstract: In the virtual network environment, the C2C e-commerce has some problems in product quality, service, credit speculation. At present the credit appraisal system offered by domestic C2C e-commerce website ensures the network security to a certain extent while it has some problems in identity verification, evaluation rules and model, credit of buyers and sellers and so on. Focused on the largest national C2C shopping website—Taobao, this article mainly analyzes the present situations and problems of the credit appraisal system, puts forward some improved suggestions of the real-name authentication, credit and transaction appraisal rules and so forth, and then establishes improved credit appraisal system.
Ginkgo biloba extract (EGb761) inhibits mitochondria-dependent caspase pathway and prevents apoptosis in hypoxia-reoxygenated cardiomyocytes
Jiangang Shen, Waisin Lee, Yong Gu, Yao Tong, Peter CW Fung, Li Tong
Chinese Medicine , 2011, DOI: 10.1186/1749-8546-6-8
Abstract: Cardiomyocytes were exposed to 24 hours of hypoxia and four hours of reoxygenation, and pretreated with EGb761, bilobalide and quertcetin. By using immunoblot, immunofluorescent, biochemical and flow cytometry techniques, we compared the effects of EGb761 and its representative constituents including quercetin and bilobalides on regulating mitochondria-dependent caspases signal pathway and apoptotic cell death in the hypoxia-reoxygenated cardiomyocytes.Pretreatment with EGb761 significantly inhibited the release of cytochrome c from mitochondria, the expression of caspase-3, cleavage activities of caspases and attenuated apoptotic cell death. The effects of quercetin on the release of cytochrome c, the cleavage activities of caspases and cell death were similar to those of EGb761 but better than those of bilobalide.The antioxidant constituents of EGb761 such as quercetin contribute to the cardioprotective effects of EGb761 and inhibit the mitochondria-dependent caspase pathway. It is possible that the mitochondria-dependent caspase pathway may be one of the molecular targets of EGb761 against myocardial ischemia-reperfusion injury.EGb761 is a standard extract from the leaves of Ginkgo biloba (Yinxing) containing 24% ginkgo-flavone glycosides (eg kaempferol, quercetin and isorhamnetin derivatives) and 6% terpenoid (eg ginkgolides A, B, C, J and bilobalide) [1]. The cardioprotective effects of EGb761 have been demonstrated in various in vivo and in vitro animal models and humans. The flavonoid components of EGb761 scavenge superoxide, hydroxyl radicals and nitric oxide (NO) and protect myocardia from ischemia-reperfusion injury [2-5]. The terpenoid constituents of EGb761 also showed their cardioprotective effects independent from the free radical-scavenging properties [6]. Therefore, it is necessary to further elucidate whether the cardioprotective mechanisms of EGb761 are attributed to its flavonoids or terpenoid conponents in the prevention of myocardial ischemia-re
Cloning of human and mouseGRY-RBP cDNA
Guangwei Du,Meihui Pan,Yan Zhou,Jianhe Chen,Hui Yao,Jiangang Yuan,Boqin Qiang
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02909766
Abstract: After screening human fetal brain cDNA library, a novel human cDNA encoding an RNA-binding protein was cloned and namedGRY-RBP. HumanGRY-RBP cDNA is 2 932 bp in length, and encodes a protein of 623 amino acids with a deduced molecular mass of 69.6 ku. Human GRY-RBP contains three RNA recognition motifs (RRMs) and a glycine (G), tyrosin (Y)-rich C-terminus. Computer searches with sequence database revealed its moderate homology with RRMs of many RRM RNA-binding proteins. In this study, the full coding region and partial non-coding region of mouseGRY-RBP cDNA were amplified by PCR using mouse brain cDNA library as template. Three transcripts ofGry-rbp are expressed in all tissues as shown by Northern blot, but the amounts in heart, planceta and skeletal muscle are considerably higher than those in other tissues.
Isolation and expression pattern analysis of novel ESTs from human fetal brain
Meihui Pan,Jiangang Yuan,Guangwei Du,Yan Zhou,Hui Yao,Boqin Qiang
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883379
Abstract: In order to learn the mechanism of brain development and differentiation, 90 expressed sequence tags (ESTs) were isolated by differential display from the cerebrum and cerebellum of 13-week and 33-week fetal brains. After searching database, 74 of them represented novel genes, some of them were homologous to the brain development related genes. Using total cDNA probes, 79 of the ESTs and their expression differences in fetal brain were further characterized.
Energy functionals and killing transform
Jiangang Ying
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882564
Abstract:
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