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Jamming transition in a two-dimensional open granular pile with rolling resistance 具有滚动阻力的二维开孔颗粒桩的干扰过渡
IF 0.9
Papers in Physics Pub Date : 2014-10-27 DOI: 10.4279/PIP.060007
C. F. M. Magalhães, A. Atman, G. Combe, J. Moreira
{"title":"Jamming transition in a two-dimensional open granular pile with rolling resistance","authors":"C. F. M. Magalhães, A. Atman, G. Combe, J. Moreira","doi":"10.4279/PIP.060007","DOIUrl":"https://doi.org/10.4279/PIP.060007","url":null,"abstract":"We present a molecular dynamics study of the jamming/unjamming transition in two-dimensional granular piles with open boundaries. The grains are modeled by viscoelastic forces, Coulomb friction and resistance to rolling. Two models for the rolling resistance interaction were assessed:  one considers a constant rolling friction coefficient, and the other one a strain dependent coefficient. The piles are grown on a finite size substrate and subsequently discharged through an orifice opened at the center of the substrate. Varying the orifice width and taking the final height of the pile after the discharge as the order parameter, one can devise a transition from a jammed regime (when the grain flux is always clogged by an arch) to a catastrophic regime, in which the pile is completely destroyed by an avalanche as large as the system size. A finite size analysis shows that there is a finite orifice width associated with the threshold for the unjamming transition, no matter the model used for the microscopic interactions. As expected, the value of this threshold width increases when rolling resistance is considered, and it depends on the model used for the rolling friction. Received: 14 June 2014,  Accepted: 7 October 2014;  Reviewed by: R. Arevalo, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore;  Edited by: L. A. Pugnaloni;  DOI: http://dx.doi.org/10.4279/PIP.060007 Cite as: C F M. Magalhaes, A P F Atman, G Combe, J G Moreira, Papers in Physics 6, 060007 (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":"71009787","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: 12
Commentary on "Critical phenomena in the spreading of opinion consensus and disagreement" 评析“共识与分歧传播中的批判现象”
IF 0.9
Papers in Physics Pub Date : 2014-08-29 DOI: 10.4279/PIP.060004
F. Bagnoli
{"title":"Commentary on \"Critical phenomena in the spreading of opinion consensus and disagreement\"","authors":"F. Bagnoli","doi":"10.4279/PIP.060004","DOIUrl":"https://doi.org/10.4279/PIP.060004","url":null,"abstract":"A Commentary on the paper by A Chacoma and D H Zanette [Pap. Phys. 6, 060003 (2014)]. The author of the paper offers a Reply. Received: 3 August 2014, Accepted: 3 August 2014; Edited by: G. Martinez Mekler; DOI: http://dx.doi.org/10.4279/PIP.060004 Cite as: F Bagnoli, Papers in Physics 6, 060004 (2014)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009839","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
Critical phenomena in the spreading of opinion consensus and disagreement 意见一致与分歧传播中的关键现象
IF 0.9
Papers in Physics Pub Date : 2014-08-29 DOI: 10.4279/PIP.060003
A. Chacoma, D. Zanette
{"title":"Critical phenomena in the spreading of opinion consensus and disagreement","authors":"A. Chacoma, D. Zanette","doi":"10.4279/PIP.060003","DOIUrl":"https://doi.org/10.4279/PIP.060003","url":null,"abstract":"We consider a class of models of opinion formation where the dissemination of individual opinions occurs through the spreading of local consensus and disagreement.  We study the emergence of full collective consensus or maximal disagreement  in one- and two-dimensional arrays. In both cases, the probability of reaching full consensus exhibits well-defined scaling properties as a function of the system size. Two-dimensional systems, in particular, possess nontrivial exponents and critical points. The dynamical rules of our models, which emphasize the interaction between small groups of agents, should be considered as complementary to the imitation mechanisms of traditional opinion dynamics. Received: 11 March 2014,  Accepted: 1 August 2014;  Reviewed by: F. Bagnoli, Dipartimento di Fisica ed Astronomia, Universita degli Studi di Firenze, Italy;  Edited by: G. Martinez Mekler;  DOI: http://dx.doi.org/10.4279/PIP.060003 Cite as: A Chacoma, D H Zanette, Papers in Physics 6, 060003 (2014)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009763","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: 9
Reply to the Commentary on "Critical phenomena in the spreading of opinion consensus and disagreement" 对“共识与分歧传播中的批判现象”评论的答复
IF 0.9
Papers in Physics Pub Date : 2014-08-29 DOI: 10.4279/PIP.060005
A. Chacoma, D. Zanette
{"title":"Reply to the Commentary on \"Critical phenomena in the spreading of opinion consensus and disagreement\"","authors":"A. Chacoma, D. Zanette","doi":"10.4279/PIP.060005","DOIUrl":"https://doi.org/10.4279/PIP.060005","url":null,"abstract":"A Reply to the Commentary by F. Bagnoli [Pap. Phys. 6, 060004 (20014)]. Received: 3 August 2014,  Accepted: 3 August 2014;  Edited by: G. Martinez Mekler;  DOI: http://dx.doi.org/10.4279/PIP.060005 Cite as: A Chacoma, D H Zanette, Papers in Physics 6, 060005 (2014)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010075","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
Experimental determination of L X-ray fluorescence cross sections for elements with 45 < Z < 50 at 10 keV 45 < Z < 50元素在10 keV下L - x射线荧光截面的实验测定
IF 0.9
Papers in Physics Pub Date : 2014-02-13 DOI: 10.4279/PIP.060001
E. Bonzi, G. Grad, R. Barrea
{"title":"Experimental determination of L X-ray fluorescence cross sections for elements with 45 < Z < 50 at 10 keV","authors":"E. Bonzi, G. Grad, R. Barrea","doi":"10.4279/PIP.060001","DOIUrl":"https://doi.org/10.4279/PIP.060001","url":null,"abstract":"Synchrotron radiation at 10 keV was used to experimentally determine the Ll, L, LI, LII, LI and LII fluorescence cross sections for elements with 45 < Z < 50, as part of an ongoing investigation at low energies. The measured data were compared with calculated values obtained using coefficients from Scofield, Krause and Puri et al. Received: 19 December 2013,  Accepted: 20 January 2014; Reviewed by: J. P. Marques, Departamento de Fisica, Centro de Fisica Atomica, Fac. de Ciencias, Universidade de Lisboa, Portugal. ; Edited by: P. Weck;  DOI: http://dx.doi.org/10.4279/PIP.060001 Cite as: E V Bonzi, G B Grad, R A Barrea, Papers in Physics 6, 060001 (2014)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009676","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
Invited review: KPZ. Recent developments via a variational formulation 特邀评审:KPZ。通过变分公式的最新发展
IF 0.9
Papers in Physics Pub Date : 2014-01-13 DOI: 10.4279/PIP.050010
H. Wio, R. Deza, C. Escudero, J. Revelli
{"title":"Invited review: KPZ. Recent developments via a variational formulation","authors":"H. Wio, R. Deza, C. Escudero, J. Revelli","doi":"10.4279/PIP.050010","DOIUrl":"https://doi.org/10.4279/PIP.050010","url":null,"abstract":"Recently, a variational approach has been introduced for the paradigmatic Kardar{Parisi{ Zhang (KPZ) equation. Here we review that approach, together with the functional Taylor expansion that the KPZ nonequilibrium potential (NEP) admits. Such expansion becomes naturally truncated at third order, giving rise to a nonlinear stochastic partial dierential equation to be regarded as a gradient-ow counterpart to the KPZ equation. A dynamic renormalization group analysis at one-loop order of this new mesoscopic model yields the KPZ scaling relation +z = 2, as a consequence of the exact cancelation of the dierent contributions to vertex renormalization. This result is quite remarkable, considering the lower degree of symmetry of this equation, which is in particular not Galilean invariant. In addition, this scheme is exploited to inquire about the dynamical behavior of the KPZ equation through a path-integral approach. Each of these aspects oers novel points of view and sheds light on particular aspects of the dynamics of the KPZ equation.","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2014-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010063","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
What season suits you best? Seasonal light changes and cyanobacterial competition 什么季节最适合你?季节性光照变化和蓝藻的竞争
IF 0.9
Papers in Physics Pub Date : 2013-11-21 DOI: 10.4279/PIP.070005
Guadalupe Cascallares, P. M. Gleiser
{"title":"What season suits you best? Seasonal light changes and cyanobacterial competition","authors":"Guadalupe Cascallares, P. M. Gleiser","doi":"10.4279/PIP.070005","DOIUrl":"https://doi.org/10.4279/PIP.070005","url":null,"abstract":"Nearly all living organisms, including some bacterial species, exhibit biological processes with a period of about 24 h called circadian (from the Latin circa , about and dies , day) rhythms. These rhythms allow living organisms to anticipate the daily alternation of light and darkness. Experiments carried out in cyanobacteria have shown the adaptive value of circadian clocks. In theseexperiments, a wild type cyanobacterial strain (with a 24 h circadian rhythm) and a mutantstrain (with a longer or shorter period) grow in competition. In different experiments, the external light dark cycle was chosen to match the circadian period of the different strains, revealing that the strain whose circadian period matches the light-dark cycle has a larger fitness. As a consequence, the initial population of one strain grows while the other decays. These experiments were made under fixed light and dark intervals. In Nature, however, this relationship changes according to the season. Therefore, seasonalchanges in light could affect the results of the competition. Using a theoretical model, we analyze how modulation of light can change the survival of the different cyanobacterial strains. Our results show that there is a clear shift in the competition due to the modulation of light, which could be verified experimentally. Received: 20 Novembre 2014,  Accepted: 29 March 2015;  Edited by: C. A. Condat, G. J. Sibona;  DOI: http://dx.doi.org/10.4279/PIP.070005 Cite as: G Cascallares, P M Gleiser, Papers in Physics 7, 070005 (2015) This paper, by G. Cascallares, P. M. Gleiser , 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":"2013-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010412","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
Reply to the Commentary on Graphite and its hidden superconductivity" 关于“石墨及其隐藏超导性”评论的答复
IF 0.9
Papers in Physics Pub Date : 2013-09-12 DOI: 10.4279/PIP.050009
P. Esquinazi
{"title":"Reply to the Commentary on Graphite and its hidden superconductivity\"","authors":"P. Esquinazi","doi":"10.4279/PIP.050009","DOIUrl":"https://doi.org/10.4279/PIP.050009","url":null,"abstract":"A Reply to the Commentary by E. M. Forgan [Pap. Phys. 5, 050008 (20013)]. Received: 30 October 2013,  Accepted: 4 November 2013;  Edited by: S. A. Grigera;  DOI: http://dx.doi.org/10.4279/ 10.4279/PIP.050009 Cite as: P. Esquinazi, Papers in Physics 5, 050009 (2013)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2013-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010037","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
Invited review: Graphite and its hidden superconductivity 特邀评论:石墨及其隐藏的超导性
IF 0.9
Papers in Physics Pub Date : 2013-09-12 DOI: 10.4279/PIP.050007
P. Esquinazi
{"title":"Invited review: Graphite and its hidden superconductivity","authors":"P. Esquinazi","doi":"10.4279/PIP.050007","DOIUrl":"https://doi.org/10.4279/PIP.050007","url":null,"abstract":"We review experimental results, from transport to magnetization measurements, on different graphite samples, from bulk oriented graphite, thin graphite films to transmission electron microscope lamellae, that indicate the existence of granular superconductivity at temperatures above 100~K. The   accumulated evidence speaks for a localization of the superconducting phase(s) at certain interfaces  embedded in semiconducting crystalline regions with Bernal stacking order. Received: 25 January 2013,  Accepted: 10 October 2013;  Reviewed by: E. M. Forgan, School of Physics & Astronomy, University of Birmingham, U.K.;  Edited by: S. A. Grigera;  DOI: http://dx.doi.org/10.4279/PIP.050007 Cite as: P Esquinazi, Papers in Physics 5, 050007 (2013)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2013-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010121","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: 13
Commentary on Graphite and its hidden superconductivity" “石墨及其隐性超导性”述评
IF 0.9
Papers in Physics Pub Date : 2013-09-12 DOI: 10.4279/PIP.050008
E. Forgan
{"title":"Commentary on Graphite and its hidden superconductivity\"","authors":"E. Forgan","doi":"10.4279/PIP.050008","DOIUrl":"https://doi.org/10.4279/PIP.050008","url":null,"abstract":"A Commentary on the paper by P. Esquinazi [Pap. Phys. 5, 050007 (2013)]. The author of the paper offers a Reply. Received: 10 October 2013,,  Accepted: 4 November 2013;  Edited by: S. A. Grigera;  DOI: http://dx.doi.org/ 10.4279/PIP.050008","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2013-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009986","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
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