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Stochastic resonance in bistable duffing oscillators and its dynamical
双稳杜芬振子的随机共振及其动力学机制

Kang Yanmei Xu Jianxue Xie Yong,
康艳梅
,徐健学,谢勇

力学学报 , 2004,
Abstract: The method of moments is applied to the bistable Duffing oscillators driven by Gaussian white noise and weak periodic force,and the converging rate of the method is found dependent on the damping size,namely,with the same nonlinear parameter,it converges quicker if the damping coefficient is larger.Since the method of moments can make us disclose more general characteristic than only using numerical simulations,the results derived from the method of moments along with the numerical simulation results can make us to find relations between stochastic resonance and stochastic dynamical behavior.With the method of moments,the mono-peak and double-peak resonant structures in the system are disclosed with the spectral amplification factor for different drive frequencies for the case of the larger damping coefficient.To explain the derived resonant structure,the dependence of nonzero frequency peaks peaked out from fluctuating spectral density on noise intensity is investigated,and the double-peaked resonance is found to be resulted from the intrawell vibrations and the above potential barrier vibrations,which is a modification to the previous result.The study confirms there are three possible resonant sources,i.e.interwell jump,intrawell vibration and above-barrier vibration in the considered system,and the results have importance in statistical mechanics.
Relaxation rate and stochastic resonance of a single-mode nonlinear optical syst em
单模非线性光学系统的弛豫速率与随机共振

Kang Yan-Mei,Xu Jian-Xue,Xie Yong,
康艳梅
,徐健学,谢 勇

物理学报 , 2003,
Abstract: The variational method is applied to a single-mode stochastic nonlinear optical system and the dependence of its relaxation rate and spectral amplification factor on the noise intensity based on the linear response theory is investigated.The investigation shows that when the biased input is vanishing,the relaxation rate has different dependence in monostable and multistable cases.The investigation also shows that the stochastic resonance occurs in one-dimensional symmetric monostable potential,and the possible condition for it is pointed out.
Stochastic resonance in two-dimensional Brownian motion in the weak noise limit
弱噪声极限下二维布朗运动的随机共振现象

Kang Yan-Mei,Xu Jian-Xue,Xie Yong,
康艳梅
,徐健学,谢勇

物理学报 , 2003,
Abstract: 在弱噪声极限下,应用多维Fokker-Planck方程的与时间有关问题方面的理论,推导了对称双稳势阱中二维布朗粒子的概率跃迁速率,并基于绝热近似理论研究了弱噪声极限下受小幅低频周期力驱动的二维布朗运动的随机共振现象.与以前的结果相比,所得到的信噪比与阻尼系数的大小无关.精确的数值模拟结果进一步说明了所得的信噪比的适用性.
A method of moments for calculating dynamic responses beyond linear response theory
Kang Yan-Mei,Xu Jian-Xue,Xie Yong,
康艳梅
,徐健学,谢 勇

中国物理 B , 2005,
Abstract: A method of moments for calculating the dynamic response of periodically driven overdamped nonlinear stochastic systems in the general response sense is proposed, which is a modification of the method of moments confined within linear response theory. The calculating experience suggests that the proposed technique is simple and efficient in implementation, and the comparison with stochastic simulation shows that the first three orders of susceptibilities calculated by the proposed technique have high accuracy. The dependence of the spectral amplification parameters at the first three harmonics on the noise intensity is also investigated, and another observed phenomenon of stochastic resonance in the systems induced by the location of a single periodic orbit is disclosed and explained.
Genome-wide gene responses in a transgenic rice line carrying the maize resistance gene Rxo1 to the rice bacterial streak pathogen, Xanthomonas oryzae pv. oryzicola
Yong-Li Zhou, Mei-Rong Xu, Ming-Fu Zhao, Xue-Wen Xie, Ling-Hua Zhu, Bin-Ying Fu, Zhi-Kang Li
BMC Genomics , 2010, DOI: 10.1186/1471-2164-11-78
Abstract: A microarray experiment was performed to reveal the molecular mechanisms underlying HR of rice to Xoc mediated by Rxo1 using a pair of transgenic and non-transgenic rice lines. Our results indicated that Rxo1 appeared to function in the very early step of the interaction between rice and Xoc, and could specifically activate large numbers of genes involved in signaling pathways leading to HR and some basal defensive pathways such as SA and ET pathways. In the former case, Rxo1 appeared to differ from the typical host R genes in that it could lead to HR without activating NDR1. In the latter cases, Rxo1 was able to induce a unique group of WRKY TF genes and a large set of genes encoding PPR and RRM proteins that share the same G-box in their promoter regions with possible functions in post-transcriptional regulation.In conclusion, Rxo1, like most host R genes, was able to trigger HR against Xoc in the heterologous rice plants by activating multiple defensive pathways related to HR, providing useful information on the evolution of plant resistance genes. Maize non-host resistance gene Rxo1 could trigger the pathogen-specific HR in heterologous rice, and ultimately leading to a localized programmed cell death which exhibits the characteristics consistent with those mediated by host resistance genes, but a number of genes encoding pentatricopeptide repeat and RNA recognition motif protein were found specifically up-regulated in the Rxo1 mediated disease resistance. These results add to our understanding the evolution of plant resistance genes.Within the natural environments, crop plants are continuously confronted with different potential pathogens and pests because of their sessile characteristics. As a result, they have evolved complicated defense mechanisms to protect themselves from these pathogenic microorganisms. These include hypersensitive reaction (HR, which is characterized by the rapid cell death surrounding the infection sites), increased expression of defens
Application of Particle Filter for Vertebral body Extraction: A Simulation Study  [PDF]
Hongyan Cui, Xiaobo Xie, Shengpu Xu, Yong Hu
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.22009
Abstract:

Lumbar vertebra motion analysis provides objective measurement of lumbar disorder. The automatic tracking algorithm has been applied to Digitalized Video Fluoroscopy (DVF) sequence. This paper proposes a new Auto-Tracking System (ATS) with a guide device and a motion analysis to automatically measure human lumbar motion. Digitalized Video Fluoroscopy (DVF) sequence was obtained during flexion-extension lumbar movement under guide device. An extraction of human vertebral body and its motion tracking were developed by particle filter. The results showed a good repeatability, reliability and robustness. In model test, the maximum fiducial error is 3.7% and the repeatability error is 1.2% in translation and the maximal repeatability error is 2.6% in rotation angle. In this simulation study, we employed a lumbar model to simulate the motion of lumber flexion- extension with the stepping translation of 1.3 mm and rotation angle of 1°. Results showed that the fiducial error was measured as 1.0%, while the repeatability error was 0.7%. The sequence can be detected even noise contamination as more as 0.5 of the density. The result demonstrates that the data from the auto-tracking algorithm shows a strong correlation with the actual measurement and that the Vertebral Auto-Tracking System (VATS) is highly repetitive. In the human lumbar spine evaluation, the study not only shows the reliability of Auto-Tracking Analysis System (ATAS), but also reveals that it is robust and variable in vivo. The VATS is evaluated by the model, the simulated sequence and the human subject. It could be concluded that the developed system could provide a reliable and robust system to detect spinal motion in future medical application.

THE DYNAMICAL MECHANISMS FOR THE SENSITIVE RESPONSE OF EXCITABLE CELLS WITH CHAOTIC FIRING TO EXTERNAL STIMULATION
混沌放电的可兴奋性细胞对外界刺激反应敏感的动力学机制

XIE Yong,XU Jian-xue,KANG Yan-mei,DUAN Yu-bin,HU San-jue,YANG Hong-jun,
谢勇
,徐健学,康艳梅,段玉斌,胡三觉,杨红军

生物物理学报 , 2004,
Abstract: It has been observed that aperioidic firing neurons have higher sensitivity than periodic firing ones in the experiments about the injured dorsal root ganglion neurons in rats subjected to norepinephrine (NE), tetraethylammonium (TEA), high Ca2+ solutions, et al. Existing results show that a number of apeirodic firing neurons actually exhibit deterministic chaotic motions, for example, chaotic spiking, chaotic bursting, integer multiple spiking, and so on. Bifurcations, crises and sensitive dependence of chaotic motions on parameters are considered as the dynamic mechanisms for the phenomena of sensitive response through the analysis of the bifurcation structure and the calculation of unstable periodic orbits constituting the most fundamental building blocks of a chaotic attractor in terms of the modified pancreatic he information of periodic orbits.
Mechanism for identification of chaotic firing interval in excitable cells
可兴奋性细胞混沌放电区间的识别机理

Xie Yong,Xu Jian-Xue,Kang Yan-Mei,Hu San-Jue,Duan Yu-Bin,
谢勇
,徐健学,康艳梅,胡三觉,段玉斌

物理学报 , 2003,
Abstract: 在神经起步点记录到加周期分岔过程的生理实验数据,在对此分岔过程中位于周期n爆发 和周期(n+1)爆发之间的混沌的峰峰间期数据检测不稳定的周期轨道时,发现从靠近周期 n爆发的混沌的峰峰间期数据中,可以检测出不稳定的周期n轨道;而从靠近周期(n+1)爆 发的混沌的峰峰间期数据中,不仅可以检测出不稳定的周期(n+1)轨道,还可以检测出不稳 定的周期n轨道.针对该现象,借助于Sherman建议的胰腺β细胞模型,从非线性动力 学角度给出了理论解释.指明了由鞍结分岔和倍周期分岔分别产生第一类阵发和第三类阵发 为出现该
Introduction of a Non-host Gene Rxo1 Cloned from Maize Resistant to Rice Bacterial Leaf Streak into Rice Varieties
玉米细菌性条斑病非寄主抗性基因Rxo1转化水稻的研究

XIE Xue-Wen,YU Jing,XU Jian-Long,ZHOU Yong-Li,LI Zhi-Kang,
谢学文
,于晶,徐建龙,周永力,黎志康

微生物学报 , 2007,
Abstract: 水稻细菌性条斑病是我国重要的水稻病害之一,但是在水稻种质资源中尚未发现抗细菌性条斑病单个主效基因。利用农杆菌介导的转化系统将从玉米中克隆的细菌性条斑病非寄主抗性基因Rxo1转入我国2个杂交稻恢复系和2个常规水稻品种。转基因植株的PCR和Southern分析结果表明Rxo1基因已整合到受体基因组中,Rxo1基因单拷贝整合的转化体在自交T1代呈现抗感3∶1分离。人工接种实验和病菌的生长曲线表明携带Rxo1的转基因植株对水稻细条病菌可以产生过敏性抗病反应。上述结果为利用非寄主抗性基因防治该病害提供了有用的信息。
Nonlinear noise reduction for electrocorticograms
皮层脑电的非线性降噪

Xie Yong,Xu Jian-Xue,Kang Yan-Mei,Yang Hong-Jun,Hu San-Jue,
谢勇
,徐健学,康艳梅,杨红军,胡三觉

物理学报 , 2003,
Abstract: Local projective nonlinear noise reduction method,which is based on locally linear fits to the nonlinear dynamics,is introduced to reduce the noise in electrocorticograms of Spragure-Dawley rats.Recurrence plots are used to estimate the size of local neighbours.In this way,the noise reduction is improved markedly.In order to show that the program for noise reduction is correct,a noise reduction process is implemented for x-axial time series of Lorenz equation contaminated by 50% gaussian white noise.And then,this noise reduction scheme is applied separately to electrocorticograms of anaesthetized rats and those of the onset of epilepsy induced by penicillin in anaesthetized rats.The analyses of a nonlinear prediction demonstrate the efficiency of noise reduction.
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