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Search Results: 1 - 10 of 55905 matches for " XIN Yong-lei "
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添加碳纳米管对钌铱锡氧化物阳极性能的影响
Effect of Carbon Nanotubes on Anodic Properties of Ti/Ru-Ir-Sn Oxides

廉锋,辛永磊,马伯江,许立坤
LIAN Feng
, XIN Yong-lei, MA Bo-jiang, XU Li-kun

- , 2015, DOI: 10.13208/j.electrochem.141219
Abstract: 摘要 本文采用热分解法制备Ti/Ru-Ir-Sn氧化物阳极,运用TGA、SEM、EDS、循环伏安、电化学交流阻抗、极化曲线以及强化电解寿命测试方法,探讨添加不同含量碳纳米管(CNTs)对Ti/Ru-Ir-Sn氧化物阳极的影响规律. 热重分析和阳极能谱数据表明,在烧结温度470 oC条件下CNTs未发生高温氧化分解,仍以单质形式存在阳极涂层中. 与对比样品相比,涂层表面裂纹增多,但仍保持典型形貌. 添加CNTs显著改善了Ti/Ru-Ir-Sn氧化物阳极的电化学性能,增大了阳极的活性表面积,减小了涂层内部电阻,提高了阳极析氯电催化活性,析氯电位增加缓慢,阳极强化电解寿命也得到明显延长. 其中,添加0.1 g·L-1 CNTs的Ti/Ru-Ir-Sn氧化物阳极电催化活性和稳定性最优
Non-Uniform FFT and Its Applications in Particle Simulations  [PDF]
Yong-Lei Wang, Fredrik Hedman, Massimiliano Porcu, Francesca Mocci, Aatto Laaksonen
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.53051
Abstract:

Ewald summation method, based on Non-Uniform FFTs (ENUF) to compute the electrostatic interactions and forces, is implemented in two different particle simulation schemes to model molecular and soft matter, in classical all-atom Molecular Dynamics and in Dissipative Particle Dynamics for coarse-grained particles. The method combines the traditional Ewald method with a non-uniform fast Fourier transform library (NFFT), making it highly efficient. It scales linearly with the number of particles as , while being both robust and accurate. It conserves both energy and the momentum to float point accuracy. As demonstrated here, it is straight- forward to implement the method in existing computer simulation codes to treat the electrostatic interactions either between point-charges or charge distributions. It should be an attractive alternative to mesh-based Ewald methods.

Exciton States and Linear Optical Spectra of Semiconducting Carbon Nanotubes under Uniaxial Strain

YU Gui-Li,JIA Yong-Lei,

中国物理快报 , 2009,
Abstract: Considering the exciton effect, the linear optical spectra of semiconducting single-walled carbon nanotubes (SWNTs) under uniaxial strain are theoretically studied by using the standard formulae of Orr and Ward Mol. Phys. 20(1971)513]. It is found that due to the wrapping effect existing in the semiconducting zigzag tubes, the excitation energies of the linear optical spectra show two different kinds of variations with increasing uniaxial strain, among which one decreases such as tube (11,0), and the other increases firstly and then decreases such as tube (10,0). These variations of the linear optical spectra are consistent with the changes of the exciton binding energies or the (quasi)continuum edge of these SWNTs calculated in our previous work, which can be used as a supplemented tool to detect the deformation degree of an SWNT under uniaxial strain.
Modified projective synchronization of a fractional-order hyperchaotic system with a single driving variable

Wang Xing-Yuan,Zhang Yong-Lei,

中国物理 B , 2011,
Abstract: In this paper, the modified projective synchronization (MPS) of a fractional-order hyperchaotic system is investigated. We design the response system corresponding to the drive system on the basis of projective synchronization theory, and determine the sufficient condition for the synchronization of the drive system and the response system based on fractional-order stability theory. The MPS of a fractional-order hyperchaotic system is achieved by transmitting a single variable. This scheme reduces the information transmission in order to achieve the synchronization, and extends the applicable scope of MPS. Numerical simulations further demonstrate the feasibility and the effectiveness of the proposed scheme.
Implementation of non-uniform FFT based Ewald summation in Dissipative Particle Dynamic method
Yong-Lei Wang,Aatto Laaksonen,Zhong-Yuan Lu
Physics , 2013, DOI: 10.1016/j.jcp.2012.09.023
Abstract: The ENUF method, i.e., Ewald summation based on the Non-Uniform FFT technique (NFFT), is implemented in Dissipative Particle Dynamics (DPD) simulation scheme to fast and accurately calculate the electrostatic interactions at mesoscopic level. In a simple model electrolyte system, the suitable ENUF-DPD parameters, including the convergence parameter $\alpha$, the NFFT approximation parameter $p$, and the cut-offs for real and reciprocal space contributions, are carefully determined. With these optimized parameters, the ENUF-DPD method shows excellent efficiency and scales as $\mathcal{O}(N\log N)$. The ENUF-DPD method is further validated by investigating the effects of charge fraction of polyelectrolyte, ionic strength and counterion valency of added salts on polyelectrolyte conformations. The simulations in this paper, together with a separately published work of dendrimer-membrane complexes, show that the ENUF-DPD method is very robust and can be used to study charged complex systems at mesoscopic level.
An efficient adaptive arithmetic coding image compression technology

Wang Xing-Yuan,Yun Jiao-Jiao,Zhang Yong-Lei,

中国物理 B , 2011,
Abstract: This paper proposes an efficient lossless image compression scheme for still images based on an adaptive arithmetic coding compression algorithm. The algorithm increases the image coding compression rate and ensures the quality of the decoded image combined with the adaptive probability model and predictive coding. The use of adaptive models for each encoded image block dynamically estimates the probability of the relevant image block. The decoded image block can accurately recover the encoded image according to the code book information. We adopt an adaptive arithmetic coding algorithm for image compression that greatly improves the image compression rate. The results show that it is an effective compression technology.
Impulsive synchronisation of a class of fractional-order hyperchaotic systems

Wang Xing-Yuan,Zhang Yong-Lei,Lin Da,Zhang Na,

中国物理 B , 2011,
Abstract: In this paper, an impulsive synchronisation scheme for a class of fractional-order hyperchaotic systems is proposed. The sufficient conditions of a class of integral-order hyperchaotic systems' impulsive synchronisation are illustrated. Furthermore, we apply the sufficient conditions to a class of fractional-order hyperchaotic systems and well achieve impulsive synchronisation of these fractional-order hyperchaotic systems, thereby extending the applicable scope of impulsive synchronisation. Numerical simulations further demonstrate the feasibility and effectiveness of the proposed scheme.
Synchronization of spatiotemporal chaotic systems and application to secure communication of digital image

Wang Xing-Yuan,Zhang N,Ren Xiao-Li,Zhang Yong-Lei,

中国物理 B , 2011,
Abstract: Coupled map lattices (CMLs) are taken as examples to study the synchronization of spatiotemporal chaotic systems. In this paper, we use the nonlinear coupled method to implement the synchronization of two coupled map lattices. Through the appropriate separation of the linear term from the nonlinear term of the spatiotemporal chaotic system, we set the nonlinear term as the coupling function and then we can achieve the synchronization of two coupled map lattices. After that, we implement the secure communication of digital image using this synchronization method. Then, the discrete characteristics of the nonlinear coupling spatiotemporal chaos are applied to the discrete pixel of the digital image. After the synchronization of both the communication parties, the receiver can decrypt the original image. Numerical simulations show the effectiveness and the feasibility of the proposed program.
Preparation of the Branch Bark Ethanol Extract in Mulberry Morus alba, Its Antioxidation, and Antihyperglycemic Activity In Vivo
Shu Wang,Meng Fang,Yong-Lei Ma,Yu-Qing Zhang
Evidence-Based Complementary and Alternative Medicine , 2014, DOI: 10.1155/2014/569652
Abstract: The biological activities of the branch bark ethanol extract (BBEE) in the mulberry Morus alba L. were investigated. The determination of active component showed that the flavonoids, phenols, and saccharides are the major components of the ethanol extract. The BBEE had a good scavenging activity of the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical with around 100?μg/mL of IC50 value. In vitro assay revealed that the BBEE strongly inhibited both α-glucosidase and sucrase activities whose IC50 values were 8.0 and 0.24?μg/mL, respectively. The kinetic analysis showed that the BBEE as a kind of α-glucosidase inhibitor characterized a competitive inhibition activity. Furthermore, the carbohydrate tolerance of the normal mice was obviously enhanced at 0.5?h and 1.0?h after the BBEE intragastric administration as compared to negative control. At 0.5, 1.0, 1.5, and 2.0?h after the intragastric administration with starch, the postprandial hyperglycemia of the type 2 diabetic mice can be significantly decreased by supplying various concentrations of the BBEE (10–40?mg/kg body weight). Therefore, the BBEE could effectively inhibit the postprandial hyperglycemia as a novel α-glucosidase activity inhibitor for the diabetic therapy. 1. Introduction Diabetes mellitus is a metabolic disorder characterized by a congenital (type 1 insulin-dependent diabetes mellitus/IDDM) or acquired (type 2 noninsulin-dependent diabetes mellitus/NIDDM) inability to transport glucose from the bloodstream into cells. The type 1 is usually diagnosed in childhood, and the body makes little or no insulin. The type 2 diabetes is an insulin resistance condition that occurs in adulthood, and it afflicts approximately 90% of all diabetics. The most beneficial therapy for the type 2 is said to be one that achieves optimal blood glucose control after a meal [1]. Now the pharmacological agents with the greatest effect on postprandial hyperglycemia included insulin, lispro, amylin analogues, and α-glucosidase inhibitors such as Acarbose, Voglibose, Miglitol, and Emiglitate [2] in which Acarbose had been extensively used in clinical practice. But the oral hypoglycemic agents currently used in clinical practice have serious side effects [3]. Management of hyperglycemia or hyperlipidemia with low side effects is still a challenge to the current medical system. Hence, there is a need to search for newer antidiabetic agents that retain therapeutic efficacy and are devoid of side effects. It is necessary to identify and have a large pool of the natural resources. There were many articles related to
Evidence of a spin resonance mode in the iron-based superconductor Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ from scanning tunneling spectroscopy
Lei Shan,Jing Gong,Yong-Lei Wang,Bing Shen,Xingyuan Hou,Cong Ren,Chunhong Li,Huan Yang,Hai-Hu Wen,Shiliang Li,Pengcheng Dai
Physics , 2012, DOI: 10.1103/PhysRevLett.108.227002
Abstract: We used high-resolution scanning tunneling spectroscopy to study the hole-doped iron pnictide superconductor Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ ($T_c=38$ K). Features of a bosonic excitation (mode) are observed in the measured quasiparticle density of states. The bosonic features are intimately associated with the superconducting order parameter and have a mode energy of $\sim$14 meV, similar to the spin resonance measured by inelastic neutron scattering. These results indicate a strong electron-spin excitation coupling in iron pictnide superconductors, similar to that in high-$T_c$ copper oxide superconductors.
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