EPL (Europhysics Letters)最新文献_第2页

Highlights from the previous volumes 前几卷的亮点

EPL (Europhysics Letters) Pub Date : 2013-07-01 DOI: 10.1209/0295-5075/127/1/00000

J. Bergenholtz, N. J. Wagner, G. Chern, E. Nascimento, W. Morgado, J. S. Watkins, N. Wilkin

引用次数: 0

Singular features in noise-induced transport with dry friction 干摩擦噪声诱导输运的奇异特征

EPL (Europhysics Letters) Pub Date : 2012-11-01 DOI: 10.1209/0295-5075/97/20001

A. Baule, Peter Sollich

引用次数: 26

Particle shape dependence in 2D granular media 二维颗粒介质中颗粒形状的依赖性

EPL (Europhysics Letters) Pub Date : 2012-08-02 DOI: 10.1209/0295-5075/98/44008

B. Saint-Cyr, K. Szarf, C. Voivret, É. Azéma, V. Richefeu, J. Delenne, G. Combe, C. Nouguier-Lehon, Pascal Villard, P. Sornay, M. Chaze, F. Radjai

{"title":"Particle shape dependence in 2D granular media","authors":"B. Saint-Cyr, K. Szarf, C. Voivret, É. Azéma, V. Richefeu, J. Delenne, G. Combe, C. Nouguier-Lehon, Pascal Villard, P. Sornay, M. Chaze, F. Radjai","doi":"10.1209/0295-5075/98/44008","DOIUrl":"https://doi.org/10.1209/0295-5075/98/44008","url":null,"abstract":"Particle shape is a key to the space-filling and strength properties of granular matter. We consider a shape parameter η describing the degree of distortion from a perfectly spherical shape. Encompassing most specific shape characteristics such as elongation, angularity and non-convexity, η is a low-order but generic parameter that we used in a numerical benchmark test for a systematic investigation of shape dependence in sheared granular packings composed of particles of different shapes. We find that the shear strength is an increasing function of η with nearly the same trend for all shapes, the differences appearing thus to be of second order compared to η. We also observe a non-trivial behavior of packing fraction which, for all our simulated shapes, increases with η from the random close packing fraction for disks, reaches a peak considerably higher than that for disks, and subsequently declines as η is further increased. These findings suggest that a low-order description of particle shape accounts for the principal trends of packing fraction and shear strength. Hence, the effect of second-order shape parameters may be investigated by considering different shapes at the same level of η.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"540 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126134192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 60

First-principles calculations of the magnetic anisotropic constants of Co–Pd multilayers: Effect of stacking faults Co-Pd多层磁各向异性常数的第一性原理计算:层错的影响

EPL (Europhysics Letters) Pub Date : 2012-07-01 DOI: 10.1209/0295-5075/99/17001

G. Wu, K. Khoo, M. Jhon, H. Meng, S. Lua, R. Sbiaa, C. Gan

{"title":"First-principles calculations of the magnetic anisotropic constants of Co–Pd multilayers: Effect of stacking faults","authors":"G. Wu, K. Khoo, M. Jhon, H. Meng, S. Lua, R. Sbiaa, C. Gan","doi":"10.1209/0295-5075/99/17001","DOIUrl":"https://doi.org/10.1209/0295-5075/99/17001","url":null,"abstract":"Using first-principles density functional theory calculations with spin-orbit coupling, we systematically investigate the magnetic anisotropic energy (MAE) of ConPdm (n+m=5) magnetic multilayers. We consider the influences of the relative atomic weight of Co, wCo, stacking fault, and external stress on the MAE. We find that out-of-plane lattice constant, saturation magnetization, and magnetic moments are almost linearly correlated with wCo. The magnetic anisotropic constant (MAC) curve of ConPdm without stacking fault shows a near-linear dependence on wCo that agrees with our derived effective MAC Kueff which includes shape, magneto-crystalline, and magneto-elastic contributions. We also show that the contributions from Pd layers to both the total magnetic moments and magnetic anisotropy are significant. The stress anisotropy due to the substrate has a weak effect on the MAC. However the stacking fault has a strong effect on the MAC. When the Co layer is thin, a Co–Pd interface without stacking fault is necessary for higher Kueff. However, when the Co layer is thick, creating stacking faults inside the Co region may produce a larger Kueff. Our study suggests the ways to increase the perpendicular magnetic anisotropy in Co–Pd multilayer systems and subsequently leads to the development of novel magnetic recording devices.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129567426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Nonlinear low-frequency collisional quantum Buneman instability 非线性低频碰撞量子Buneman不稳定性

EPL (Europhysics Letters) Pub Date : 2012-06-05 DOI: 10.1209/0295-5075/97/26001

F. Haas, A. Bret

引用次数: 39

Shapes of hydrophobic thick membranes 疏水厚膜的形状

EPL (Europhysics Letters) Pub Date : 2012-06-05 DOI: 10.1209/0295-5075/98/56006

T. X. Hoang, J. Banavar, A. Maritan

引用次数: 0

Is the cochlea coiled to provide sound localization? 耳蜗是否盘绕以提供声音定位?

EPL (Europhysics Letters) Pub Date : 2012-06-01 DOI: 10.1209/0295-5075/98/58002

Xun Huang, Chi Xu, L. Bai

引用次数: 9

Traffic-driven epidemic spreading on networks of mobile agents 交通驱动的流行病在移动代理网络上传播

EPL (Europhysics Letters) Pub Date : 2012-06-01 DOI: 10.1209/0295-5075/98/68003

Han-Xin Yang, Wenxu Wang, Y. Lai, Bing-Hong Wang

引用次数: 21

Numerical investigation of high-contrast ultrafast all-optical switching in low-refractive-index polymeric photonic crystal nanobeam microcavities 低折射率聚合物光子晶体纳米微腔中高对比度超快全光开关的数值研究

EPL (Europhysics Letters) Pub Date : 2012-06-01 DOI: 10.1209/0295-5075/98/54002

Ziming Meng, X. Zhong, Chen Wang, Zhiyuan Li

引用次数: 10

Comment on “Imbibition in layered systems of packed beads” by Reyssat M. et al. Reyssat M.等人对“堆积珠层状系统中的渗吸”的评论。

EPL (Europhysics Letters) Pub Date : 2012-06-01 DOI: 10.1209/0295-5075/98/56003

C. Hall

{"title":"Comment on “Imbibition in layered systems of packed beads” by Reyssat M. et al.","authors":"C. Hall","doi":"10.1209/0295-5075/98/56003","DOIUrl":"https://doi.org/10.1209/0295-5075/98/56003","url":null,"abstract":"In [1], Reyssat et al. give a succinct theoretical analysis of 1-D capillarity-driven imbibition into layered porous materials, dealing with two-layer and graded-permeability (multi-layer) systems. They provide also some careful experimental data on imbibition into layered glass beadpacks. Quantitative experiments are few and far between in this field, so these results are valuable. It should perhaps be recognized that the capillary absorption of liquids into layered porous materials has been of interest in soil physics, hydrology and construction engineering for many years. The literature goes back at least to Childs and Bybordi [2] who provided equations for the infiltration of water into stratified soils under the combined action of capillarity and gravity (see also Childs [3]). Later Wilson et al. [4] gave the general solution for pure capillary absorption (imbibition) from a liquid reservoir into the two-layer composite with arbitrary permeability and wet-front capillary potential. This was later extended [5] to the 1-D n-layer composite with layers having arbitrary thicknesses and hydraulic (capillary) properties. (These and other results on capillary transport in layered composites are discussed fully also in [6].) In all these analyses it is assumed that the wetted region is saturated, as assumed also in [1]. These are therefore Green-Ampt or Sharp Front models, and are distinct from unsaturated flow models in which a gradient of liquid water content exists within the wetted region. The solutions in [1] are obtained using a KozenyCarman permeability k, and a Young-Laplace wet-front capillary pressure p, with the further simplification that both the wetting index c and the porosity φ are constant throughout the composite system. Thus, the capillary properties scale with the particle diameter d throughout. With these restrictions, the main result for the two-layer [AB] case for s, eq. (11) of [1], follows immediately","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132681718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3