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Density distribution of particles upon jamming after an avalanche in a 2D silo 二维筒仓雪崩后颗粒堵塞的密度分布
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2015-04-29 DOI: 10.4279/PIP.070007
R. Uñac, J. L. Sales, M. Gargiulo, A. Vidales
We present a complete analysis of the density distribution of particles in a two dimensional silo after discharge. Simulations through a pseudo-dynamic algorithm are performed for filling and subsequent discharge of a plane silo. Particles are monosized hard disks deposited in the container and subjected to a tapping process for compaction. Then, a hole of a given size is open at the bottom of the silo and the discharge is triggered. After a clogging at the opening is produced, and equilibrium is restored, the final distribution of the remaining particles at the silo is analyzed by dividing the space into cells with different geometrical arrangements to visualize the way in which the density depression near the opening is propagated throughout the system. The different behavior as a function of the compaction degree is discussed. Received: 9 December 2014,  Accepted: 13 April 2015;  Edited by: L. A. Pugnaloni;  Reviewed by: F. Vivanco, Dpto. de Fisica, Universidad de Santiago de Chile, Chile;  DOI: http://dx.doi.org/10.4279/PIP.070007 Cite as: R. O. Unac, J. L. Sales, M. V. Gargiulo, A. M. Vidales, Papers in Physics 7, 070007 (2015) This paper, by R. O. Unac, J. L. Sales, M. V. Gargiulo, A. M. Vidales , is licensed under the Creative Commons Attribution License 3.0 .
我们提出了一个完整的分析颗粒密度分布在一个二维筒仓后的排放。利用拟动态算法对平面筒仓的充填和后续卸料进行了仿真。颗粒是在容器中沉积的单尺寸硬盘,并经过攻丝过程进行压实。然后,在筒仓底部打开一个给定尺寸的孔,并触发排放。在开口处产生堵塞并恢复平衡后,通过将空间划分为具有不同几何排列的单元来分析筒仓中剩余颗粒的最终分布,以可视化开口附近密度下降在整个系统中传播的方式。讨论了压实程度对不同行为的影响。收稿日期:2014年12月9日,收稿日期:2015年4月13日;编辑:L. A. Pugnaloni;审阅人:F. Vivanco, Dpto。智利圣地亚哥大学de Fisica;本文由R. O. Unac, J. L. Sales, M. V. Gargiulo, A. M. Vidales撰写,采用知识共享署名许可3.0协议。
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引用次数: 1
Characterizing flowability of granular materials by onset of jamming in orifice flows 通过孔口流动中干扰的发生来表征颗粒物料的流动性
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2015-04-21 DOI: 10.4279/PIP.070004
P. Mort
This paper describes methods to measure flow rate and jamming onset of granules discharged through a flat-bottom cylindrical hopper with a circular orifice. The intrinsic jamming onset for ideal particles (spherical, monodisperse, smooth) is experimentally measured by two independent methods, with good agreement. For non-ideal particles, the normalized jamming onset increases with elongated granule shape, broadened size distribution and increased friction as measured by the drained angle of repose. An empirical model of the jamming onset is introduced to quantify these effects over the range of materials investigated.  The jamming onset can be used as a measure of differentiation between relatively free-flowing granules. Received: 17 Novembre 2014,  Accepted: 2 March 2015;  Edited by: L. A. Pugnaloni; Reviewed by: G. Lumay, University of Liege, Belgium;  DOI: http://dx.doi.org/10.4279/PIP.070004 Cite as: P Mort, Papers in Physics 7, 070004 (2015) This paper, by Paul Mort , is licensed under the Creative Commons Attribution License 3.0 .
本文介绍了一种测量颗粒通过带圆孔的平底圆筒料斗排出时的流量和堵塞起爆率的方法。用两种独立的方法测量了理想粒子(球形、单分散、光滑)的本征干扰,结果吻合较好。对于非理想颗粒,随颗粒形状的拉长、尺寸分布的扩大和摩擦的增加,归一化干扰开始时间增加。一个经验模型的干扰开始被引入量化这些影响的材料范围内的研究。干扰的开始可以作为相对自由流动的颗粒之间的区分措施。收稿日期:2014年11月17日,收稿日期:2015年3月2日;编辑:L. A. Pugnaloni;审评人:G. Lumay,比利时列日大学;本文由Paul Mort撰写,采用知识共享署名许可3.0协议进行授权。
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引用次数: 6
Noise versus chaos in a causal Fisher-Shannon plane 因果Fisher-Shannon平面中的噪声与混沌
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2015-04-14 DOI: 10.4279/PIP.070006
O. Rosso, F. Olivares, A. Plastino
We revisit the Fisher-Shannon representation plane , evaluated using the Bandt and Pompe recipe to assign a probability distribution to atime series. Several stochastic dynamical (noises with , , power spectrum) and chaotic processes (27 chaoticmaps) are analyzed so as to illustrate the approach. Our  mainachievement is uncovering the informational properties of theplanar location. Received: 20 Novembre 2014,  Accepted: 1 April 2015;  Edited by: C. A. Condat, G. J. Sibona;  DOI: http://dx.doi.org/10.4279/PIP.070006 Cite as: O A Rosso, F Olivares, A Plastino, Papers in Physics 7, 070006 (2015) This paper, by Osvaldo A. Rosso, Felipe Olivares, Angelo Plastino , is licensed under the Creative Commons Attribution License 3.0 .
我们重新审视Fisher-Shannon表示平面,使用Bandt和Pompe配方对时间序列分配概率分布进行评估。为了说明该方法的可行性,本文还分析了几种随机动态过程(具有、、功率谱的噪声)和混沌过程(27个混沌映射)。我们的主要成果是揭示了平面位置的信息属性。收稿日期:2014年11月20日,收稿日期:2015年4月1日;编辑:C. A. Condat, G. J. Sibona;本文由Osvaldo A. Rosso, Felipe Olivares, Angelo Plastino撰写,采用知识共享署名许可3.0协议。
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引用次数: 21
Two distinct desynchronization processes caused by lesions in globally coupled neurons 全局耦合神经元病变引起的两种不同的去同步过程
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2015-03-25 DOI: 10.4279/PIP.070002
F. A. Ferrari, R. Viana
To accomplish a task, the brain works like a synchronized neuronal network where all the involved neurons work together. When a lesion spreads in the brain, depending on its evolution, it can reach a significant portion of relevant area. As a consequence, a phase transition might occur: the neurons desynchronize and cannot perform a certain task anymore. Lesions are responsible for either disrupting the neuronal connections or, in some cases, for killing the neuron. In this work, we will use a simplified model of neuronal network to show that these two types of lesions cause different types of desynchronization. Received: 20 November 2014,  Accepted: 10 March 2015;  Edited by: C. A. Condat, G. J. Sibona;  DOI: http://dx.doi.org/10.4279/PIP.070002 Cite as: F A S Ferrari, R L Viana, Papers in Physics 7, 070002 (2015) This paper, by Fabiano A. S. Ferrari, Ricardo L. Viana , is licensed under the Creative Commons Attribution License 3.0 .
为了完成一项任务,大脑就像一个同步的神经网络,所有相关的神经元都在一起工作。当病变在大脑中扩散时,根据其演变,它可以到达相关区域的很大一部分。结果,可能会发生相变:神经元不同步,不能再执行某项任务。病变要么破坏神经元连接,要么在某些情况下杀死神经元。在这项工作中,我们将使用一个简化的神经网络模型来显示这两种类型的病变导致不同类型的去同步。收稿日期:2014年11月20日,收稿日期:2015年3月10日;编辑:C. A. Condat, G. J. Sibona;本文由Fabiano A. S. Ferrari, Ricardo L. Viana撰写,采用知识共享署名许可3.0协议。
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引用次数: 2
Wang-Landau algorithm for entropic sampling of arch-based microstates in the volume ensemble of static granular packings 静态颗粒填料体积系综中拱微态熵采样的Wang-Landau算法
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2015-03-09 DOI: 10.4279/PIP.070001
D. Slobinsky, L. Pugnaloni
We implement the Wang-Landau algorithm to sample with equal probabilities the static configurations of a model granular system. The "non-interacting rigid arch model" used is based on the description of static configurations by means of splitting the assembly of grains into sets of stable arches. This technique allows us to build the entropy as a function of the volume of the packing for large systems. We make a special note of the details that have to be considered when defining the microstates and proposing the moves for the correct sampling in these unusual models. We compare our results with previous exact calculations of the model made at moderate system sizes. The technique opens a new opportunity to calculate the entropy of more complex granular models. Received: 19 January 2015,  Accepted: 25 February 2015;  Reviewed by: M. Pica Ciamarra, Nanyang Technological University, Singapore;  Edited by: C. S. O'Hern;  DOI: http://dx.doi.org/10.4279/PIP.070001 Cite as: D Slobinsky, L A Pugnaloni, Papers in Physics 7, 070001 (2015) This paper, by Demian Slobinsky, Luis Ariel Pugnaloni , is licensed under the Creative Commons Attribution License 3.0 .
我们实现了Wang-Landau算法,以等概率对模型颗粒系统的静态配置进行采样。所使用的“非相互作用刚性拱模型”是基于静态构型的描述,通过将颗粒组合拆分为稳定拱组。这种技术允许我们将熵建立为大型系统包装体积的函数。在这些不寻常的模型中,当定义微观状态并提出正确采样的移动时,我们会特别注意必须考虑的细节。我们将我们的结果与先前在中等系统大小下所做的模型的精确计算进行比较。该技术为计算更复杂颗粒模型的熵提供了新的机会。收稿日期:2015年1月19日,收稿日期:2015年2月25日;评审:M. Pica Ciamarra,新加坡南洋理工大学;编辑:C. S. O'Hern;出处:http://dx.doi.org/10.4279/PIP.070001引用为:D Slobinsky, L A Pugnaloni, Papers in Physics 7, 070001(2015)本文由Demian Slobinsky, Luis Ariel Pugnaloni撰写,使用知识共享署名许可3.0。
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引用次数: 2
Nonlinearity arising from noncooperative transcription factor binding enhances negative feedback and promotes genetic oscillations. 非合作转录因子结合引起的非线性增强了负反馈,促进了遗传振荡。
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2014-12-02 eCollection Date: 2014-01-01 DOI: 10.4279/PIP.060012
Ivan M Lengyel, Daniele Soroldoni, Andrew C Oates, Luis G Morelli

We study the effects of multiple binding sites in the promoter of a genetic oscillator. We evaluate the regulatory function of a promoter with multiple binding sites in the absence of cooperative binding, and consider different hypotheses for how the number of bound repressors affects transcription rate. Effective Hill exponents of the resulting regulatory functions reveal an increase in the nonlinearity of the feedback with the number of binding sites. We identify optimal configurations that maximize the nonlinearity of the feedback. We use a generic model of a biochemical oscillator to show that this increased nonlinearity is reflected in enhanced oscillations, with larger amplitudes over wider oscillatory ranges. Although the study is motivated by genetic oscillations in the zebrafish segmentation clock, our findings may reveal a general principle for gene regulation.

我们研究了基因振荡器启动子中多个结合位点的影响。我们评估了具有多个结合位点的启动子在缺乏合作结合的情况下的调节功能,并考虑了结合抑制子数量如何影响转录速率的不同假设。所得到的调节函数的有效希尔指数显示,随着结合位点的数量,反馈的非线性增加。我们确定了使反馈非线性最大化的最优配置。我们使用生化振荡器的通用模型来表明,这种增加的非线性反映在增强的振荡中,在更宽的振荡范围内具有更大的振幅。虽然这项研究的动机是斑马鱼分割时钟的遗传振荡,但我们的发现可能揭示了基因调控的一般原理。
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引用次数: 0
Influence of surface tension on two fluids shearing instability 表面张力对两种流体剪切不稳定性的影响
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2014-11-25 DOI: 10.4279/PIP.060006
R. Banerjee, S. Kanjilal
Using extended Layzer's potential flow model, we investigate the  effects of surface tension on the growth of the bubble and spike in combined Rayleigh-Taylor and Kelvin-Helmholtz instability. The nonlinear asymptotic solutions are obtained analytically for the velocity and curvature of the bubble and spike tip. We find that the surface tension decreases the velocity but does not affect the curvature, provided surface tension is greater than a critical value. For a certain condition, we observe that surface tension stabilizes the motion. Any perturbation, whatever its magnitude, results stable with nonlinear oscillations. The nonlinear oscillations depend on surface tension and relative velocity shear of the two fluids. Received: 20 March 2014,  Accepted: 7 August 2014;  Edited by: A. Marti;  DOI: http://dx.doi.org/10.4279/PIP.060006 Cite as: R Banerjee, S Kanjilal, Papers in Physics 6, 060006 (2014)
利用扩展的Layzer势流模型,我们研究了表面张力对瑞利-泰勒和开尔文-亥姆霍兹复合不稳定性中气泡和尖峰生长的影响。得到了气泡和尖刺的速度和曲率的非线性渐近解。我们发现,如果表面张力大于一个临界值,表面张力会降低速度,但不会影响曲率。在一定条件下,我们观察到表面张力使运动稳定。任何扰动,无论其大小如何,都会产生稳定的非线性振荡。非线性振荡取决于两种流体的表面张力和相对速度剪切。收稿日期:2014年3月20日,收稿日期:2014年8月7日;编辑:A. Marti;引用全文:R Banerjee, S Kanjilal, Papers in Physics 6, 060006 (2014)
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引用次数: 0
Commentary on "Granular discharge rate for submerged hoppers" “沉斗颗粒排出率”述评
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2014-10-28 DOI: 10.4279/PIP.060010
L. Staron
A Commentary on the paper by T. J. Wilson et al. [Pap. Phys. 6, 060009 (2014)]. The authors of the paper offer a Reply. Received: 16 October 2014,  Accepted: 16 October 2014;  Edited by: L. A. Pugnaloni;  DOI: http://dx.doi.org/10.4279/PIP.060010 Cite as: L Staron, Papers in Physics 6, 060010 (2014)
t.j. Wilson等人的论文评论[p.]物理学报,2017,06 - 01 [j]。这篇论文的作者给出了一个答复。收稿日期:2014年10月16日,收稿日期:2014年10月16日;编辑:L. A. Pugnaloni;引用出处:L Staron, Papers in Physics 6, 060010 (2014)
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引用次数: 1
Reply to the Commentary on "Granular discharge rate for submerged hoppers" 关于“沉斗颗粒排出率”问题的答复
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2014-10-28 DOI: 10.4279/PIP.060011
T. Wilson, C. R. Pfeifer, N. Meysingier, D. Durian
A Reply to the Commentary by L. Staron [Pap. Phys. 6, 060010 (20014)]. Received: 16 October 2014,  Accepted: 16 October 2014;  Edited by: L. A. Pugnaloni;  DOI: http://dx.doi.org/10.4279/PIP.060011 Cite as: T J Wilson, C R Pfeifer, N Meysingier, D J Durian, Papers in Physics 6, 060011 (2014)
对L. Staron评论的答复[p.]。物理学报,2004,26(6):559 - 564。收稿日期:2014年10月16日,收稿日期:2014年10月16日;编辑:L. A. Pugnaloni;引用全文:T J Wilson, C R Pfeifer, N meyssingier, D J Durian, Papers in Physics, 6, 060011 (2014)
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引用次数: 3
Commentary on "Jamming transition in a two-dimensional open granular pile with rolling resistance" “带滚动阻力的二维开孔颗粒桩的干扰过渡”述评
IF 0.9 Q3 PHYSICS, MULTIDISCIPLINARY Pub Date : 2014-10-27 DOI: 10.4279/PIP.060008
R. Arévalo
A Commentary on the paper by C F M Magalhes et. al. [Pap. Phys. 6, 060007 (2014)]. Received: 10 October 2014,  Accepted: 10 October 2014;  Edited by: L. A. Pugnaloni;  DOI: http://dx.doi.org/10.4279/PIP.060008 Cite as: R. Arevalo, Papers in Physics 6, 060008 (2014)
C . F . M . Magalhes等人的论文评注[p.]物理学报,2017,06 - 01 [j]。收稿日期:2014年10月10日,收稿日期:2014年10月10日;编辑:L. A. Pugnaloni;引用出处:R. Arevalo, Papers in Physics 6, 060008 (2014)
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引用次数: 0
期刊
Papers in Physics
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