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Search Results: 1 - 10 of 42652 matches for " Xiaoqun Xu "
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Analysis on China’s Urban-Rural Integration: The Perspective of Path-Dependence  [PDF]
Xiaoqun Yang
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.42018
Abstract: With the development of the economy and society, to a certain extent, the development of the rural and the urban areas will integrate as the economic trend. The urban-rural dual structure in China has been mitigated in recent years, however, overall there are still a lot of differences be-tween the rural and urban areas and the gap between them cannot be ignored. The integrated development of rural and urban areas is at a low level and it is confronted with the negative effects of path-dependence. They are some factors now constraining the urban-rural integration, like the governance concept of separated administration in the urban and the rural areas, the impact of the choice of the initial institution and the negative impact of the urban and the rural subject behavior. Therefore, in order to break the path-dependence of urban-rural integration, innovation is needed in the concept of governance, institutional framework, motivation system, cooperation mechanism and so on.
Indivisible quantum evolution of a driven open spin-$S$ system
Xiang Hao,Xuefen Xu,Xiaoqun Wang
Physics , 2012,
Abstract: Using a recently proposed measure for divisibility of a dynamical map, we study the non-Markovian character of a quantum evolution of a driven spin-$S$ system weakly coupled to a bosonic bath. The complete tomographic knowledge about the dynamics of the open system is obtained by the time-convolutionless master equation in the secular approximation. The derived equation can be applied to a wide range of spin-boson models with the Hermitian or non-Hermitian coupling operator in the system-environment interaction Hamiltonian. Besides the influence of the environmental spectral densities, the tunneling energy of the system Hamiltonian can affect the measure of quantum non-Markovianity. It is found that the non-Markovian feature of a dynamical map of a high-dimension spin system is noticeable in contrast to that of a low-dimension spin system.
Both ischemic preconditioning and ghrelin administration protect hippocampus from ischemia/reperfusion and upregulate uncoupling protein-2
Yajun Liu, Lianbi Chen, Xiaoqun Xu, Eric Vicaut, Richard Sercombe
BMC Physiology , 2009, DOI: 10.1186/1472-6793-9-17
Abstract: After global forebrain ischemia (15 min) with 72 h reperfusion (I/R group), we found important neuronal lesion in the rat hippocampal CA1 region, which was reduced by a preceding 3-min preconditioning ischemia (IPC+I/R group), whereas the preconditioning stimulus alone (IPC group) had no effect. Compared to control, UCP2 protein labelling increased moderately in the I/R (+39%, NS) and IPC+I/R (+28%, NS) groups, and substantially in the IPC group (+339%, P < 0.05). Treatment with superoxide dismutase (10000 U/kg ip) at the time of a preconditioning ischemia greatly attenuated (-73%, P < 0.001) the increase in UCP2 staining at 72 h, implying a role of oxygen radicals in UCP2 induction.Hippocampal UCP2 mRNA showed a moderate increase in I/R (+33%, P < 0.05) and IPC+I/R (+40%, P < 0.05) groups versus control, and a large increase in the IPC group (+333%, P < 0.001). In ghrelin experiments, the I/R+ghrelin group (3 daily administrations) showed considerable protection of CA1 neurons versus I/R animals, and increased hippocampal UCP2 mRNA (+151%, P < 0.001).We confirm that IPC causes increased expression of UCP2 protein in vivo, at a moment appropriate for protection against I/R in the hippocampus. The two dissimilar protective strategies, IPC and ghrelin administration, were both associated with upregulated UCP2, suggesting that UCP2 may often represent a final common pathway in protection from I/R.Protection against ischemic lesion has been very extensively studied in the heart and brain. One powerful endogenous mechanism of protection present in these and other organs is ischemic preconditioning. This consists of a single or a series of brief, non-lethal ischemic periods which condition the tissue to resist against significant cell death when subsequently challenged by a normally lethal ischemia. Delayed protection, which is the subject of the present study, takes place from 12 h to 7 days after the preconditioning ischemia [1-5], and must involve transcriptional regul
Low-Lying Energy Properties of a Frustrated Antiferromagnetic Spin-$\frac 1 2$ Ladder
Xiaoqun Wang
Physics , 1998,
Abstract: Using the Density Matrix Renormalization Group method, we determined the phase diagram of a frustrated antiferromagnetic spin-$\frac 1 2$ ladder at zero temperature. Two spin-gapped phases, the Haldane phase and the singlet phase, are identified. A phase transition between the two phases occurs at any non-zero value of frustration coupling $J_{\times}$. On the phase boundary, the spin gap vanishes for sufficiently small $J_{\times}$. Crossing this non-gapped line, the transition is of second order, while of first order for larger $J_{\times}$. Striking frustration effects are predicted for ladder materials.
A Kondo impurity in one dimensional correlated conduction electrons
Xiaoqun Wang
Physics , 1997, DOI: 10.1142/S0217984998000780
Abstract: A spin-1/2 magnetic impurity coupled to a one-dimensional correlated electron system have been studied by applying the density renormalization group method. The Kondo temperature is substantially enhanced by strong repulsive interactions in the chain, but changes non-monotonically in the case of electron attraction. The magnetization of the impurity at zero- temperature shows local Fermi liquid behavior.
An Appreciation of “A Psalm of Life  [PDF]
Xiaoqun Chen
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104489
“A Psalm of Life”, often subtitled “What the Heart of the Young Man Said to the Psalmist”, is a lyric written by Henry Wadsworth Longfellow, an American romantic poet [1]. In order to have an aesthetic appreciation, the author consults some literature and analyzes the poem in terms of its gist, theme, poetical features and practical significance. The conclusion is that full of aesthetics, this poem reveals an optimistic theme, appeals to readers’ minds and emotions and shows the poet’s noble spiritual world.
An improved replica plating method and its application to the high-throughput selection of transformants

Minjun Xu,Xiaoqun Tian,Shining Zhou,

微生物学报 , 2008,
Abstract: Objective] To make a simpler and highly efficient replica plating tool to avoid the limitations of the traditional method. Methods] A number of bamboo-toothpicks was sheaved to form a bundle with diameter close to the plate diameter. The sheaved bamboo-toothpicks were used for replica-plating. Results] This replica plating tool was successfully used for the screening of Saccahromyces cerevisiae transformants. Conclusion] Compared with the traditional tool, this tool was simpler and highly efficient.
Mitochondrial Pyruvate dehydrogenase E1 of Nosema bombycis: A Marker in Microsporidian evolution
Tian LI, Xiaoqun DANG, Jinshan XU, Handeng LIU, Guoqing PAN, Zeyang ZHOU
Current Zoology , 2009,
Abstract: Microsporidia are a group of intracelluar eukaryotic parasites, which can infected almost all animals, including human beings. Till now, no mitochodria but mitosome, a remnant of mitochondria was discovered in this phylum. We present here the mitochondrial pyruvate dehydrogenase E1 (PDH, including PDHα and PDHβ) of the microsporidian Nosema bombycis, the pathogen of silkworm pébrine. Compared with PDH of microsporidian Encephalitozoon cuniculi and Antonospora locustae, both subunits are conserved. The phylogeny indicated that both subunits are mitochondrial. The syntenic maps revealed the subunits organization of NbPDH is distributed in different scaffolds, similar to that of EcPDH but different with AlPDH, and the relationship between phylogeny tree and organization of PDH suggest that the AlPDH subunits organization is the ancestral style of microsporidia, and through the genome evolution, the reshuffling of the chromosome of microsporidia occurred, the adjacent style of ALPDHE1 organization changed, and the two subunits separated and located to different chromosomes in E. cuniculi. For N. bombycis and N. ceranae, they locate to different scaffolds. In order to determine NbPDH subcellular localizations, we prepared the polyclonal antibodies against NbPDH prokaryotic fusion proteins, and adopted the colloidal gold immunological electron microscopy, the expression signals of NbPDH were observed in spores however, the subcellular localization were not definited. In general, through comparison of three microsporidian PDH molecular phylogeny, subunits organization in chromosomes, localization indicated that PDH is an interesting marker in microsporidia evolution [Current Zoology 55(6): 423 – 429,2009].
Inferring topologies via driving-based generalized synchronization of two-layer networks
Yingfei Wang,Xiaoqun Wu,Hui Feng,Jun-an Lu,Yuhua Xu
Physics , 2015,
Abstract: The interaction topology among the constituents of a complex network plays a crucial role in the network's evolutionary mechanisms and functional behaviors. However, some network topologies are usually unknown or uncertain. Meanwhile, coupling delay are ubiquitous in various man-made and natural networks. Hence, it is necessary to gain knowledge of the whole or partial topology of a complex dynamical network by taking into consideration communication delay. In this paper, topology identification of complex dynamical networks is investigated via generalized synchronization of a two-layer network. Particularly, based on the LaSalle-type invariance principle of stochastic differential delay equations, an adaptive control technique is proposed by constructing an auxiliary layer and designing proper control input and updating laws so that the unknown topology can be recovered upon successful generalized synchronization. Numerical simulations are provided to illustrate the effectiveness of the proposed method. The superiority of this technique lies in its practical and economical feasibility. Firstly, when the considered network is composed of systems with high-dimension or complicated dynamics, a simpler response layer can be constructed, which leads to reduction of application costs. Moreover, it is practical to take into consideration perturbations caused by control input. Finally, the method is applicable to infer topology of a subnetwork embedded within a large-scale network and locate hidden sources. The results provide basic insight into further research endeavors on understanding practical and economical topology inference of small- and large-scale networks.
Advance in the toxic effects of petroleum water accommodated fraction on marine plankton

Zhibing Jiang,Yijun Huang,Xiaoqun Xu,Yibo Liao,Lu Shou,Jingjing Liu,Quanzhen Chen,Jiangning Zeng,

生态学报 , 2010,
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