Spiral waves and spatiotemporal chaos usually are harmful and need to be suppressed. In this paper, a method is proposed to control them. Travel wave trains can be generated by periodic excitations near left boundary,...Spiral waves and spatiotemporal chaos usually are harmful and need to be suppressed. In this paper, a method is proposed to control them. Travel wave trains can be generated by periodic excitations near left boundary,spiral waves and spatiotemporal chaos can be eliminated by the trains for some certain excitation periods. Obvious resonant behavior can be observed from the relation between the periods of the trains and excitation ones. The method is against noise.展开更多
We propose a new approach to the old-standing problem of the anomaly of the scaling exponents of passivescalars of turbulence.Different to the original problem,the distribution function of the prescribed random veloci...We propose a new approach to the old-standing problem of the anomaly of the scaling exponents of passivescalars of turbulence.Different to the original problem,the distribution function of the prescribed random velocity fieldis multi-dimensional normal and delta-correlated in time.Here,our random velocity field is spatially correlative.Forcomparison,we also give the result obtained by the Gaussian random velocity field without spatial correlation.Theanomalous scaling exponents H (p) of passive scalar advected by two kinds of random velocity above are determined forstructure function up to p=15 by numerical simulations of the random shell model with Runge-Kutta methods to solvethe stochastic differential equations.We observed that the H(p) 's obtained by the multi-dimensional normal distributionrandom velocity are more anomalous than those obtained by the independent Gaussian random velocity.展开更多
OBJECTIVE The Ginkgo Leaf Extract and Armillariella Mellea Powders Oral(Yinxingmihuan Koufu Rongye,YXMH),a representative drug for"Treating both Brain and Heart",showed considerable clinical effects in isch⁃...OBJECTIVE The Ginkgo Leaf Extract and Armillariella Mellea Powders Oral(Yinxingmihuan Koufu Rongye,YXMH),a representative drug for"Treating both Brain and Heart",showed considerable clinical effects in isch⁃emic cardiovascular and cerebral vascular diseases.Recently,it is reported that YXMH has the potential for treating myocardial and cerebral ischemia related mental disorders,such as post stroke depression(PSD)and chronic heart disease(CHD)associated anxiety disorder.However,its mechanism has not been clearly elucidated.Meanwhile,increasing evidence revealed that there are close functional links between depression and habenular nucleus.The present study investigates the underlying mechanism of YXMH on attenuating the inflammation of microglia in habenular nucleus through CX3CL1-CX3CR1 axis in in a rat model of PSD.METHODS Rats were randomly devided into sham group,model group,Ginaton group(18 mg·kg^-1),Armillariella Mellea group(600 mg·kg-1),Fluoxetine group(10 mg·kg^-1),YXMH high-dose group(618 mg·kg^-1)and YXMH low-dose group(309 mg·kg^-1).The PSD model was induced by transarterial microembolization combined with sleep deprivation(2-Chloro-D-phenylalanine,PCPA,IH,200 mg·kg^-1,for 3 times,before the behavior test)in SD male rats.Then rats were treated with corresponding medicaments through gavage once a day until 3 weeks later,followed by body mass measurement,neurological deficit score evaluation,gripping strength and thermal withdrawl latency measurement,as well as depression related behavioral indicators,the open field test(OFT)and sucrose preference test.The pathological morphological changes of habenular nucleus was observed by HE staining,the expression of IBA-1 was measured and analyzed by immunohistochemistry staining,and alterations of proteins and genes related to the CX3CL1-CX3CR1 axis were analyzed using Western blotting(CX3CL1,CX3CR1)and real-time polymerase chain reaction(PCR)(CX3CL1,CX3CR1).RESULTS Compared with the sham group,rats in the model group manifested as decreased body mass,deficient neurological behavior and gripping strength,reduced loco⁃motor activity and sugar water consumption,as well as elevated thermal withdrawl latency(P<0.05,P<0.01).Mean⁃while,the pathological morphology of the habenular nucleus on the ischemic hemisphere showed significant neuronal degeneration,microglial proliferation,inflammatory cells and glia cells infiltration,together with up-regualted expression of IBA-1,CX3CL1,CX3CR1 protein and CX3CL1,CX3CR1 mRNA.YXMH attenuated inflammation of microglia in habenular nucleus through improving pathological morphology,inhibiting IBA-1 activation,down-regulating the expres⁃sion of CX3CL1 and CX3CR1 proteins and genes,and thus improved the behavior performance of ischemic injury and depression.CONCLUSION YXMH ameliorates neurological deficit and depressive behavior in rat model of PSD induced by transarterial microembolization combined with sleep deprivation,and the mechanism is probably related to attenu⁃ating inflammation of microglia in habenular nucleus through CX3CL1-CX3CR1 axis.展开更多
The method for controlling Hamiltonian chaos by adaptive integrable mode coupling is extended to controlling strong chaos by adaptive integrable and near-integrable mode coupling.We illustrate this method with a highl...The method for controlling Hamiltonian chaos by adaptive integrable mode coupling is extended to controlling strong chaos by adaptive integrable and near-integrable mode coupling.We illustrate this method with a highly chaotic system,the perturbed cat map.All orbits can be effectively controlled to the periodic or quasiperiodic orbits.The method is robust against the presence of weak external noise.展开更多
We generalize the Frenkel-Kontorov model to the Frenkel-Kontorova-Devonshire model in which the interaction is the triple-well potential.By use of the effective potential method,numerical solutions of eigenvalue probl...We generalize the Frenkel-Kontorov model to the Frenkel-Kontorova-Devonshire model in which the interaction is the triple-well potential.By use of the effective potential method,numerical solutions of eigenvalue problem are used to work out the exact phase diagrams of a triple-well potential W and a piecewise parabolic potential V.According to the winding numberωand the rotation numberΩ,we analyze the periodicity of the phase diagram and find some complex but regular phase structures.The properties of the phase structures are closely related to the period of the external potential.展开更多
The reconstruction of the dimerized overlayer system with vacancies is studied via a diatomic chain Frenkel Kontorova model.We present the details of the exactly solvable model and the analytical solution of the atomi...The reconstruction of the dimerized overlayer system with vacancies is studied via a diatomic chain Frenkel Kontorova model.We present the details of the exactly solvable model and the analytical solution of the atomic displacements in the ground state.Our calculations explain the 2×N reconstruction observed in Ge/Si(100)and Ga/Si(112).展开更多
A generalized Frenkel-Kontorova model with the Morse potentials is studied.The phase diagram reflects the nonlinear nature of the Morse potential.The correspondences of the ground states and the orbits of the area-pre...A generalized Frenkel-Kontorova model with the Morse potentials is studied.The phase diagram reflects the nonlinear nature of the Morse potential.The correspondences of the ground states and the orbits of the area-preserving map are studied numerically.Our results present a better simulation to the real systems.展开更多
The convergence of box-counting algorithm for computing the capacity of strange attractors is affected by the discretization procedure,because the period of the difference equations differs from that of the original O...The convergence of box-counting algorithm for computing the capacity of strange attractors is affected by the discretization procedure,because the period of the difference equations differs from that of the original ODE'S and,in addition,a damping factor appears.展开更多
基金Project(52001281)supported by the National Natural Science Foundation of ChinaProject(192102210012)supported by Key Scientific and Technological Research Projects in Henan Province,ChinaProject(202300410431)supported by Natural Science Foundation of Henan Province,China。
基金The project supported by National Natural Science Foundation of China under Grant No.10647127National Natural Science Foundation of China for Major Projects under Grant No.10335010the Natural Science Foundation of Hebei Province of China under Grant No.A2006000128
基金国家重点基础研究发展计划(973计划)，中国科学院资助项目，国家自然科学基金，the Innovation Funds for Laser Technology，the Science Foundation of the Chinese Academy of Engineering Physics
文摘Spiral waves and spatiotemporal chaos usually are harmful and need to be suppressed. In this paper, a method is proposed to control them. Travel wave trains can be generated by periodic excitations near left boundary,spiral waves and spatiotemporal chaos can be eliminated by the trains for some certain excitation periods. Obvious resonant behavior can be observed from the relation between the periods of the trains and excitation ones. The method is against noise.
基金supported by National Natural Science Foundation-the Science Foundation of China Academy of Engineering Physics (NSAF) under Grant No. 10576076the Major Projects of National Natural Science Foundation of China under Grant No. 10335010
文摘在这篇论文， f <SUB>0</SUB>-δ 参数表面上的动力学行为为 Gledzer Ohkitani Yamada 模型被调查。我们显示 intermittency 混乱转变的类型是僵绳节点分叉。我们在 f <SUB>0</SUB>-δ 参数表面上阴谋阶段图，它被划分成周期、伪周期、断断续续的混乱区域。借助于改变泰勒米克罗塞尔·雷纳兹数字，我们计算速度结构功能的扩大自我类似。
基金The project supported by National Natural Science Foundation of China, the Science Foundation of China Academy of Engineering Physics under Grant No. 10576076, the Major Projects of National Natural Science Foundation of China under Grant No. 10335010, and the Science Foundation of China Academy of Engineering Physics under Grant No. 20040430.We would like to thank Guo-Yong Yuan and Li-Bin Fu, for their useful discussions.
基金National Natural Science Foundation of China for Major Projects under Grant No.10576005
文摘We propose a new approach to the old-standing problem of the anomaly of the scaling exponents of passivescalars of turbulence.Different to the original problem,the distribution function of the prescribed random velocity fieldis multi-dimensional normal and delta-correlated in time.Here,our random velocity field is spatially correlative.Forcomparison,we also give the result obtained by the Gaussian random velocity field without spatial correlation.Theanomalous scaling exponents H (p) of passive scalar advected by two kinds of random velocity above are determined forstructure function up to p=15 by numerical simulations of the random shell model with Runge-Kutta methods to solvethe stochastic differential equations.We observed that the H(p) 's obtained by the multi-dimensional normal distributionrandom velocity are more anomalous than those obtained by the independent Gaussian random velocity.
基金National Natural Science Foundation of China(8187304081403141)
文摘OBJECTIVE The Ginkgo Leaf Extract and Armillariella Mellea Powders Oral(Yinxingmihuan Koufu Rongye,YXMH),a representative drug for"Treating both Brain and Heart",showed considerable clinical effects in isch⁃emic cardiovascular and cerebral vascular diseases.Recently,it is reported that YXMH has the potential for treating myocardial and cerebral ischemia related mental disorders,such as post stroke depression(PSD)and chronic heart disease(CHD)associated anxiety disorder.However,its mechanism has not been clearly elucidated.Meanwhile,increasing evidence revealed that there are close functional links between depression and habenular nucleus.The present study investigates the underlying mechanism of YXMH on attenuating the inflammation of microglia in habenular nucleus through CX3CL1-CX3CR1 axis in in a rat model of PSD.METHODS Rats were randomly devided into sham group,model group,Ginaton group(18 mg·kg^-1),Armillariella Mellea group(600 mg·kg-1),Fluoxetine group(10 mg·kg^-1),YXMH high-dose group(618 mg·kg^-1)and YXMH low-dose group(309 mg·kg^-1).The PSD model was induced by transarterial microembolization combined with sleep deprivation(2-Chloro-D-phenylalanine,PCPA,IH,200 mg·kg^-1,for 3 times,before the behavior test)in SD male rats.Then rats were treated with corresponding medicaments through gavage once a day until 3 weeks later,followed by body mass measurement,neurological deficit score evaluation,gripping strength and thermal withdrawl latency measurement,as well as depression related behavioral indicators,the open field test(OFT)and sucrose preference test.The pathological morphological changes of habenular nucleus was observed by HE staining,the expression of IBA-1 was measured and analyzed by immunohistochemistry staining,and alterations of proteins and genes related to the CX3CL1-CX3CR1 axis were analyzed using Western blotting(CX3CL1,CX3CR1)and real-time polymerase chain reaction(PCR)(CX3CL1,CX3CR1).RESULTS Compared with the sham group,rats in the model group manifested as decreased body mass,deficient neurological behavior and gripping strength,reduced loco⁃motor activity and sugar water consumption,as well as elevated thermal withdrawl latency(P<0.05,P<0.01).Mean⁃while,the pathological morphology of the habenular nucleus on the ischemic hemisphere showed significant neuronal degeneration,microglial proliferation,inflammatory cells and glia cells infiltration,together with up-regualted expression of IBA-1,CX3CL1,CX3CR1 protein and CX3CL1,CX3CR1 mRNA.YXMH attenuated inflammation of microglia in habenular nucleus through improving pathological morphology,inhibiting IBA-1 activation,down-regulating the expres⁃sion of CX3CL1 and CX3CR1 proteins and genes,and thus improved the behavior performance of ischemic injury and depression.CONCLUSION YXMH ameliorates neurological deficit and depressive behavior in rat model of PSD induced by transarterial microembolization combined with sleep deprivation,and the mechanism is probably related to attenu⁃ating inflammation of microglia in habenular nucleus through CX3CL1-CX3CR1 axis.
基金Supported by the Special Funds for Major State Basic Research Projects,the National Natural Science Foundation of China under Grant Nos.19835020 and 19920003Science Foundation of China Academy of Engineering Physics under Grant No.20000440.
文摘The method for controlling Hamiltonian chaos by adaptive integrable mode coupling is extended to controlling strong chaos by adaptive integrable and near-integrable mode coupling.We illustrate this method with a highly chaotic system,the perturbed cat map.All orbits can be effectively controlled to the periodic or quasiperiodic orbits.The method is robust against the presence of weak external noise.
基金Supported by the National Natural Science Foundation of China under Grant No.19774049Science Foundation of China Academy of Engineering Physics under Grant No.980112.
文摘We generalize the Frenkel-Kontorov model to the Frenkel-Kontorova-Devonshire model in which the interaction is the triple-well potential.By use of the effective potential method,numerical solutions of eigenvalue problem are used to work out the exact phase diagrams of a triple-well potential W and a piecewise parabolic potential V.According to the winding numberωand the rotation numberΩ,we analyze the periodicity of the phase diagram and find some complex but regular phase structures.The properties of the phase structures are closely related to the period of the external potential.
基金Supported by the National Natural Science Foundation of China under Grant No.19774049the Science Foundation of China Academy of Engineering Physics under Grant Nos.970116 and 980112.
文摘The reconstruction of the dimerized overlayer system with vacancies is studied via a diatomic chain Frenkel Kontorova model.We present the details of the exactly solvable model and the analytical solution of the atomic displacements in the ground state.Our calculations explain the 2×N reconstruction observed in Ge/Si(100)and Ga/Si(112).
基金Supported by the National Natural Science Foundation of China under Grant No.1945004Science Foundation of China Academy of Engineering Physics under Grant No.970116.
文摘A generalized Frenkel-Kontorova model with the Morse potentials is studied.The phase diagram reflects the nonlinear nature of the Morse potential.The correspondences of the ground states and the orbits of the area-preserving map are studied numerically.Our results present a better simulation to the real systems.
文摘The convergence of box-counting algorithm for computing the capacity of strange attractors is affected by the discretization procedure,because the period of the difference equations differs from that of the original ODE'S and,in addition,a damping factor appears.
