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Search Results: 1 - 10 of 36485 matches for " Yun He "
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Reliability Analysis of Systems Based on the UFLP under Facility Failure and Conditional Supply Cases  [PDF]
Min Wang, Zongtian Wei, Yun He
Advances in Pure Mathematics (APM) , 2012, DOI: 10.4236/apm.2012.22019
Abstract: The reliability of facility location problems has been received wide attention for several decades. Researchers formulate varied models to optimize the reliability of location decisions. But the most of such studies are not practical since the models are too ideal. In this paper, based on the classical uncapacitated fixed-charge location problem (UFLP) and some supply constraints from the reality, we distinguish deterministic facility failure and stochastic facility failure cases to formulate models to measure the reliability of a system. The computational results and reliability envelopes for a specific example are also given.
Chaotic Structures in Brent & WTI Crude Oil Markets: Empirical Evidence
Ling-Yun HE
International Journal of Economics and Finance , 2011, DOI: 10.5539/ijef.v3n5p242
Abstract: This article provided empirical evidence of existence of chaotic structures in the time series of Brent and WTI crude oil price returns, by means of the Phase Space Reconstruction Technique (PSRT) and fractal integral method. This paper analyzed the time series of oil prices, attained the fractal dimensions, positive Lyapunov exponents and Kolmogorov entropy, and thereby identified the existence of chaos in the markets. Our results can deepen the understanding of crude oil dynamics and the complexity of the analyzed markets.
A Numerical Study of the Effect of Disorder on Optical Conductivity in Inhomogeneous Superconductors  [PDF]
Long He, Jian Sun, Cunjun Yang, Yun Song
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.46A004

We present the effect of disorder on the optical conductivity of two-dimensional inhomogeneous superconductors by applying the kernel polynomial method to solve the Bogoliubov-de Gennes equations. By means of the lattice size scaling of the generalized inverse participation ratio, we find that the localization length of the quasiparticle decreases significantly with the increase of the disorder strength. Meanwhile, the weak disorder can readily restrain the Drude weight, while the superconducting gap has the tendency to suppress the low-energy optical conductivity. We also employ the Lanczos exact diagonalization method to study the competition between the on-site repulsive interactions and disorder. It is shown that the screening effect of repulsive interactions significantly enhances the Drude weight in the normal phase.

Mechanisms of the Regulation of the Intestinal Exchanger NHE3
Peijian He,C. Chris Yun
Journal of Biomedicine and Biotechnology , 2010, DOI: 10.1155/2010/238080
Abstract: A major of Na
Determination of Nanogram Quantities of Emodin in Pharmaceutical Preparations and Biofluids by Luminol-Myoglobin Chemiluminescence System
Yun Zhang,Xili He,Zhenghua Song
Spectroscopy: An International Journal , 2012, DOI: 10.1155/2012/741053
Abstract: Based on the quenching effect of emodin on the luminol-myoglobin (Mb) reaction, a sensitive method for the determination of nanogram level emodin by flow injection chemiluminescence (FI-CL) is presented for the first time. It was found that the CL intensity from luminol-Mb system could be inhibited in the presence of emodin, and the decrement of CL intensity was linearly proportional to the logarithm of emodin concentration in the range of 0.5–300ng?mL?1 (R = 0.9956) with the detection limit of 0.2ng?mL?1 (3σ). At a flow rate of 2.0mL?min?1, a complete determination of emodin, including sampling and washing, could be accomplished in 0.5 min with the relative standard deviations (RSDs) of less than 3.5% (n = 5). The proposed method was successfully applied to the determination of emodin in pharmaceutical preparations and human serum samples. The possible CL mechanism of luminol-Mb-emodin reaction was explained.
Study on Distributed Mutual Exclusion Algorithms Based on the Token

LI Yun-He,

计算机科学 , 2008,
Abstract: 在对现有典型分布式系统中互斥算法研究的基础上, 本文依据令牌技术, 提出了一种分布式系统中解决互斥问题的新算法.文中对算法的设计思想及实现过程进行了详细描述, 同时对其性能进行了严格的理论证明和分析, 该算法能有效地提高系统的通信效率.
Pulse wave: the bridge connecting traditional Chinese medicine with Western medicine
Xiang-he SONG,Yun WANG
Zhong Xi Yi Jie He Xue Bao , 2008,
Abstract: : Pulse wave, a research focus in both traditional Chinese medicine and Western medicine, which contains a wealth of human physiological and pathological information, has always been the concern of medical practitioners. On the basis of the review on the development of the pulse wave theory and its applications, the existing problems in this field are discussed in this paper. On the basis of the status quo of pulse wave information extraction methods and the utilization of pulse wave in traditional Chinese and Western medicine, a more in-depth study on pulse wave is proposed to make it a bridge connecting traditional Chinese medicine with Western medicine.
New application of the (G'/G,1/G)-expansion method to the KP equation
Yun-Jie Yang,Yan He
Applied Mathematical Sciences , 2013,
Abstract: In this paper, we extend the (G'/G,1/G)-expansion method to the (2+1)-dimensional Kadomstev-Petivshvili (KP) equation. As a result, hyperbolic function solution, trigonometric function solution and rational solution are obtained.
Disorder-Driven Superconductor-Insulator Transition in d-Wave Superconducting Ultrathin Films
Long He,Jian Sun,Yun Song
Physics , 2013,
Abstract: We study the superconductor-insulator transition (SIT) in $d$-wave superconducting ultrathin films. By means of the kernel polynomial method, the Bogoliubov-de Gennes equations are solved for square lattices with up to $360\times 360$ unit cells self-consistently, making it possible to observe fully the nanoscale spatial fluctuations of the superconducting order parameters and discriminate accurately the localized quasiparticle states from the extended ones by the lattice-size scaling of the generalized inverse participation ratio. It is shown that Anderson localization can not entirely inhibit the occurrence of the local superconductivity in strongly-disordered $d$-wave superconductors. Separated by an insulating 'sea' completely, a few isolated superconducting 'islands' with significant enhancement of the local superconducting order parameters can survive across the SIT. The disorder-driven SIT, therefore, is a transition from a $d$-wave superconductor to a Bose insulator which consists of localized Cooper pairs. Unlike an $s$-wave superconductor which presents a robust single-particle gap across the SIT, the optical conductivity of a $d$-wave superconductor reveals a gapless insulating phase, where the SIT can be detected by observing the disappearance of the Drude weight with the increasing disorder.
Large-scale stable interacting dark energy model: Cosmological perturbations and observational constraints
Yun-He Li,Xin Zhang
Physics , 2013, DOI: 10.1103/PhysRevD.89.083009
Abstract: Dark energy might interact with cold dark matter in a direct, nongravitational way. However, the usual interacting dark energy models (with constant $w$) suffer from some catastrophic difficulties. For example, the $Q\propto\rho_{\rm c}$ model leads to an early-time large-scale instability, and the $Q\propto\rho_{\rm de}$ model gives rise to the future unphysical result for cold dark matter density (in the case of a positive coupling). In order to overcome these fatal flaws, we propose in this paper an interacting dark energy model (with constant $w$) in which the interaction term is carefully designed to realize that $Q\propto\rho_{\rm de}$ at the early times and $Q\propto\rho_{\rm c}$ in the future, simultaneously solving the early-time superhorizon instability and future unphysical $\rho_{\rm c}$ problems. The concrete form of the interaction term in this model is $Q=3\beta H \frac{\rho_{\rm{de}}\rho_{\rm{c}}}{\rho_{\rm{de}}+\rho_{\rm{c}}}$, where $\beta$ is the dimensionless coupling constant. We show that this model is actually equivalent to the decomposed new generalized Chaplygin gas (NGCG) model, with the relation $\beta=-\alpha w$. We calculate the cosmological perturbations in this model in a gauge-invariant way and show that the cosmological perturbations are stable during the whole expansion history provided that $\beta>0$. Furthermore, we use the Planck data in conjunction with other astrophysical data to place stringent constraints on this model (with eight parameters), and we find that indeed $\beta>0$ is supported by the joint constraint at more than 1$\sigma$ level. The excellent theoretical features and the support from observations all indicate that the decomposed NGCG model deserves more attention and further investigation.
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