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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
Papers in Physics Pub Date : 2015-04-29 DOI: 10.4279/PIP.070007
R. Uñac, J. L. Sales, M. Gargiulo, A. Vidales
{"title":"Density distribution of particles upon jamming after an avalanche in a 2D silo","authors":"R. Uñac, J. L. Sales, M. Gargiulo, A. Vidales","doi":"10.4279/PIP.070007","DOIUrl":"https://doi.org/10.4279/PIP.070007","url":null,"abstract":"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 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2015-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71011098","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: 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
Papers in Physics Pub Date : 2015-04-21 DOI: 10.4279/PIP.070004
P. Mort
{"title":"Characterizing flowability of granular materials by onset of jamming in orifice flows","authors":"P. Mort","doi":"10.4279/PIP.070004","DOIUrl":"https://doi.org/10.4279/PIP.070004","url":null,"abstract":"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 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010341","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: 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
Papers in Physics Pub Date : 2015-04-14 DOI: 10.4279/PIP.070006
O. Rosso, F. Olivares, A. Plastino
{"title":"Noise versus chaos in a causal Fisher-Shannon plane","authors":"O. Rosso, F. Olivares, A. Plastino","doi":"10.4279/PIP.070006","DOIUrl":"https://doi.org/10.4279/PIP.070006","url":null,"abstract":"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 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2015-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010865","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: 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
Papers in Physics Pub Date : 2015-03-25 DOI: 10.4279/PIP.070002
F. A. Ferrari, R. Viana
{"title":"Two distinct desynchronization processes caused by lesions in globally coupled neurons","authors":"F. A. Ferrari, R. Viana","doi":"10.4279/PIP.070002","DOIUrl":"https://doi.org/10.4279/PIP.070002","url":null,"abstract":"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 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2015-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010183","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: 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
Papers in Physics Pub Date : 2015-03-09 DOI: 10.4279/PIP.070001
D. Slobinsky, L. Pugnaloni
{"title":"Wang-Landau algorithm for entropic sampling of arch-based microstates in the volume ensemble of static granular packings","authors":"D. Slobinsky, L. Pugnaloni","doi":"10.4279/PIP.070001","DOIUrl":"https://doi.org/10.4279/PIP.070001","url":null,"abstract":"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 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2015-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010538","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: 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
Papers in Physics 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
{"title":"Nonlinearity arising from noncooperative transcription factor binding enhances negative feedback and promotes genetic oscillations.","authors":"Ivan M Lengyel, Daniele Soroldoni, Andrew C Oates, Luis G Morelli","doi":"10.4279/PIP.060012","DOIUrl":"10.4279/PIP.060012","url":null,"abstract":"<p><p>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.</p>","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7611245/pdf/EMS127447.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39188925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Papers in Physics Pub Date : 2014-11-25 DOI: 10.4279/PIP.060006
R. Banerjee, S. Kanjilal
{"title":"Influence of surface tension on two fluids shearing instability","authors":"R. Banerjee, S. Kanjilal","doi":"10.4279/PIP.060006","DOIUrl":"https://doi.org/10.4279/PIP.060006","url":null,"abstract":"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)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009742","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: 0
Commentary on "Granular discharge rate for submerged hoppers" “沉斗颗粒排出率”述评
IF 0.9
Papers in Physics Pub Date : 2014-10-28 DOI: 10.4279/PIP.060010
L. Staron
{"title":"Commentary on \"Granular discharge rate for submerged hoppers\"","authors":"L. Staron","doi":"10.4279/PIP.060010","DOIUrl":"https://doi.org/10.4279/PIP.060010","url":null,"abstract":"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)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010558","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: 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
Papers in Physics Pub Date : 2014-10-28 DOI: 10.4279/PIP.060011
T. Wilson, C. R. Pfeifer, N. Meysingier, D. Durian
{"title":"Reply to the Commentary on \"Granular discharge rate for submerged hoppers\"","authors":"T. Wilson, C. R. Pfeifer, N. Meysingier, D. Durian","doi":"10.4279/PIP.060011","DOIUrl":"https://doi.org/10.4279/PIP.060011","url":null,"abstract":"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)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010451","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
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
Papers in Physics Pub Date : 2014-10-27 DOI: 10.4279/PIP.060008
R. Arévalo
{"title":"Commentary on \"Jamming transition in a two-dimensional open granular pile with rolling resistance\"","authors":"R. Arévalo","doi":"10.4279/PIP.060008","DOIUrl":"https://doi.org/10.4279/PIP.060008","url":null,"abstract":"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)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010368","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: 0
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