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Search Results: 1 - 10 of 195803 matches for " CHEN Li-Xin "
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Soil acidity in larch plantations and its correlation with organic phosphorus types

CHEN Li-Xin,

生态学报 , 2005,
Abstract: Changes in soil acidity and its correlation with organic phosphorus types were studied for larch(Larix olgensis) plantations with different development stages in mountainous area of eastern Northeast China.The results showed that total hydrolytic acidity in rhizosphere soil at different development stages were higher than those in non-rhizosphere soil,but the ratio of exchangeable acidity and total acidity in rhizosphere soil showed an opposite trend;The active acidity(pH value) in rhizosphere soil decrease...
Research and Analysis of Game Theory Based Node Cooperation Strategies in Mobile Ad Hoc Networks

CHEN Li-Xin,

计算机系统应用 , 2010,
Abstract: With the aim at solving the problem of a selfish node refusing forward service requests of a mobile Ad hoc network, based on a Game theory in economics, this paper describes the method of identifying selfish nodes through detecting the cooperation rates of neighboring nodes and proposes statistics based on repeated Game strategies LTFT and LEpTFT. Also, the paper proposes a rule of adopting different strategies according to different aims of cooperation. Analysis shows that the strategies and rule can effectively encourage cooperation and punish selfishness to solve network problem and nodes to benefit from tradeoffs.
Second Moment Convergence Rates for Uniform Empirical Processes
You-You Chen,Li-Xin Zhang
Journal of Inequalities and Applications , 2010, DOI: 10.1155/2010/972324
Second Moment Convergence Rates for Uniform Empirical Processes
Chen You-You,Zhang Li-Xin
Journal of Inequalities and Applications , 2010,
Abstract: Let be a sequence of independent and identically distributed -distributed random variables. Define the uniform empirical process as , . In this paper, we get the exact convergence rates of weighted infinite series of .
Time scales of epidemic spread and risk perception on adaptive networks
Li-Xin Zhong,Tian Qiu,Fei Ren,Ping-Ping Li,Bi-Hui Chen
Physics , 2010, DOI: 10.1209/0295-5075/94/18004
Abstract: Incorporating dynamic contact networks and delayed awareness into a contagion model with memory, we study the spreading patterns of infectious diseases in connected populations. It is found that the spread of an infectious disease is not only related to the past exposures of an individual to the infected but also to the time scales of risk perception reflected in the social network adaptation. The epidemic threshold $p_{c}$ is found to decrease with the rise of the time scale parameter s and the memory length T, they satisfy the equation $p_{c} =\frac{1}{T}+ \frac{\omega T}{a^s(1-e^{-\omega T^2/a^s})}$. Both the lifetime of the epidemic and the topological property of the evolved network are considered. The standard deviation $\sigma_{d}$ of the degree distribution increases with the rise of the absorbing time $t_{c}$, a power-law relation $\sigma_{d}=mt_{c}^\gamma$ is found.
Influence of gate voltage on gate-induced drain leakage current in ultra-thin gate oxide and ultra-short channel LDD nMOSFET's
超薄栅超短沟LDD nMOSFET中栅电压对栅致漏极泄漏电流影响研究

Chen Hai-Feng,Guo Li-Xin,

物理学报 , 2012,
Abstract: The influence of gate voltage VG on gate induced drain leakage (GIDL) current is studied in LDD nMOSFET with a gate oxide of 1.4nm and a channel length of 100nm. It is found that the split phenomena of ln(Id/(VDG-1.2))-1/(VDG-1.2) curves under different VG values occurs, which are different from the large MOSFET. Through comparing varieties of ln(Id/(VDG-1.2)) of different VG values, the mechanism of this split phenomenon is obtained. This is ascribed to the change of the hole-tunneling part of GIDL current under different VG values. The absolute value of ln(Id/(VDG-1.2)) curve slope decrease with |VG| value decreasing . It is further found that the values of slope c and intercept d of ln(Id/(VDG-1.2)) curves are linear with VG and the slopes of c and d are 3.09 and -0.77, respectively. The values of c and d quantificationally show the influence of VG on the GIDL current in an ultra-thin ultra-short MOSFET. On the basis of these results, a new GIDL current model including VG is proposed.
Nanosecond Square Pulse Fiber Laser based on the Nonlinear Amplifying Loop Mirror

CHEN Guo-Liang,GU Chun,XU Li-Xin,WANG An-Ting,MING Hai,

中国物理快报 , 2011,
Crankled S-Ring Resonator with Small Electrical Size
Hongsheng Chen;Li-Xin Ran;Bae-Ian Wu;Jin Au Kong;Tomasz M. Grzegorczyk
PIER , 2006, DOI: 10.2528/PIER06112003
Abstract: Metamaterials with small electrical size are more feasible to be described by the macroscopic parameters and treated as an effective homogenous media. By using geometric optimization, we experimentally realize a metamaterial composed of crankled S-ring resonator,whose electrical size is 2.5 times smaller than the conventional S-ring resonator. The overall effective capacitance of the unit structure is greatly increased when viewed from an equivalent circuit model point of view,so the resonant frequency is decreased, and the metamaterial works at a much longer wavelength regime. In addition,w e summarize two kinds of other methods that could be used to reduce the electrical size of the structures. Experimental and simulation results are presented,sho wing the effectiveness of these methods in the metamaterial homogenization.
Wave and Ray Analysis of a Type of Cloak Exhibiting Magnified and Shifted Scattering Effect
Yu Luo;Jingjing Zhang;Hongsheng Chen;Bae-Ian Wu;Li-Xin Ran
PIER , 2009, DOI: 10.2528/PIER09070805
Abstract: Ray-tracing exercise and full-wave analysis were performed to validate the performance of a type of cloak composed of isotropic metamaterials. It is shown that objects inside the 'folded region' of this cloak appear invisible to the incoming light from a ray tracing exercise, but exhibit magnified and shifted scattering under a plane wave illumination from a full wave analysis. Gaussian beams are introduced to resolve this interesting paradox resulted from these two methods. We show that at the time-harmonic state, small energy can be diffracted into the folded region and contribute to the resonant state even when the Gaussian beam is steered away from the cloak with an object inside. A scattering pattern identical to that scattered from the image of the object will be formed, which agrees well with the phenomenon in the plane wave incidence case.
Achieving Large Effective Aperture Antenna with Small Volume Based on Coordinate Transformation
Dexin Ye;Sheng Xi;Hongsheng Chen;Jiangtao Huangfu;Li-Xin Ran
PIER , 2011, DOI: 10.2528/PIER10081303
Abstract: The size of an antenna should be relatively large in order to get high radiation directivity. However, in some applications, the antenna is restricted in small region, while high directivity is still required. In this paper, we propose the method of realizing antennae with large effective apertures using arbitrary shaped small PEC reflectors and small volumes of left-handed materials based on coordinate transformation. Using this method, antennae with effective large parabolic apertures are designed using both a small parabolic reflector and a planar reflector. This design method is validated by the numerical simulations based on the Finite Element Method (FEM).
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