It is considered that the effective interaction between any two quarks of a baryon can be approximately described by a simple harmonic potential. The problem is firstly solved in Cartesian coordinates in order to find the energy levels irrespective of their angular momenta. Then, the problem is also solved in polar cylindrical coordinates in order to take into account the angular momenta of the levels. Comparing the two solutions, a correspondence is made between the angular momenta and parities for almost all experimentally determined levels. The agreement with the experimental data is quite impressive and, in general, the discrepancy between calculated and experimental values is below 5%. A couple of levels of , , , and present discrepacies between 6.7% and 12.5% ( , , , , , , , , , , , , , , and ). Received: 6 June 2011, Accepted: 13 July 2011; Edited by: D. Restrepo; Reviewed by: J. H. Munoz, Universidad del Tolima, Ibague, Colombia and Centro Brasileiro de Pesquisas Fisica ; DOI: http://dx.doi.org/10.4279/PIP.030003 Cite as: M. E. de Souza, Papers in Physics 3, 030003 (2011)
认为重子中任意两个夸克之间的有效相互作用可以用简谐势近似描述。首先在笛卡尔坐标系中求解，求出与角动量无关的能级。然后，在极柱坐标系中求解问题，以考虑水平的角动量。比较这两种解，在几乎所有实验确定的能级上，角动量和宇称都是对应的。与实验数据的吻合程度令人印象深刻，计算值与实验值的差异一般在5%以下。在6.7%和12.5%(，，，，，，，，，，，，，，和)之间存在几个水平的差异。收稿日期:2011年6月6日，收稿日期:2011年7月13日;编辑:D. Restrepo;审评人:J. H. Munoz，哥伦比亚伊巴格托利马大学和巴西财经研究中心;出处:m.e. de Souza, Papers in Physics 3, 030003 (2011)
{"title":"Calculation of almost all energy levels of baryons","authors":"M. D. Souza","doi":"10.4279/PIP.030003","DOIUrl":"https://doi.org/10.4279/PIP.030003","url":null,"abstract":"It is considered that the effective interaction between any two quarks of a baryon can be approximately described by a simple harmonic potential. The problem is firstly solved in Cartesian coordinates in order to find the energy levels irrespective of their angular momenta. Then, the problem is also solved in polar cylindrical coordinates in order to take into account the angular momenta of the levels. Comparing the two solutions, a correspondence is made between the angular momenta and parities for almost all experimentally determined levels. The agreement with the experimental data is quite impressive and, in general, the discrepancy between calculated and experimental values is below 5%. A couple of levels of , , , and present discrepacies between 6.7% and 12.5% ( , , , , , , , , , , , , , , and ). Received: 6 June 2011, Accepted: 13 July 2011; Edited by: D. Restrepo; Reviewed by: J. H. Munoz, Universidad del Tolima, Ibague, Colombia and Centro Brasileiro de Pesquisas Fisica ; DOI: http://dx.doi.org/10.4279/PIP.030003 Cite as: M. E. de Souza, Papers in Physics 3, 030003 (2011)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2011-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009600","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}
We report the enhancement of the optical second harmonic signal in non-centrosymmetric semiconductor CdS quantum dots, when they are placed in close contact with isolated silver nanoparticles. The intensity enhancement is about 1000. We also show that the enhancement increases when the incoming laser frequency is tuned toward the spectral position of the silver plasmon at , proving that the silver nanoparticle modifies the nonlinear emission. Received: 8 March 2011, Accepted: 30 May 2011; Edited by: L. Vina; Reviewed by: R. Gordon, Department of Electrical and Computer Engineering, University of Victoria, British Columbia, Canada; DOI: 10.4279/PIP.030002 Cite as: P. M. Jais, C. von Bilderling, A. V. Bragas, Papers in Physics 3, 030002 (2011)
我们报道了当非中心对称半导体CdS量子点与孤立的银纳米粒子密切接触时，光学二次谐波信号的增强。强度增强约1000。我们还发现，当入射激光频率向银等离子体激元的光谱位置调谐时，增强效应增加，证明纳米银粒子改变了非线性发射。收稿日期:2011年3月8日，收稿日期:2011年5月30日;编辑:L. Vina;评审人:R. Gordon，加拿大不列颠哥伦比亚省维多利亚大学电气与计算机工程系;DOI: 10.4279 / PIP.030002引用自:P. M. Jais, C. von Bilderling, A. V. Bragas，《物理学报》3,030002 (2011)
{"title":"Plasmon-enhanced second harmonic generation in semiconductor quantum dots close to metal nanoparticles","authors":"Pablo M. Jais, C. Bilderling, A. Bragas","doi":"10.4279/PIP.030002","DOIUrl":"https://doi.org/10.4279/PIP.030002","url":null,"abstract":"We report the enhancement of the optical second harmonic signal in non-centrosymmetric semiconductor CdS quantum dots, when they are placed in close contact with isolated silver nanoparticles. The intensity enhancement is about 1000. We also show that the enhancement increases when the incoming laser frequency is tuned toward the spectral position of the silver plasmon at , proving that the silver nanoparticle modifies the nonlinear emission. Received: 8 March 2011, Accepted: 30 May 2011; Edited by: L. Vina; Reviewed by: R. Gordon, Department of Electrical and Computer Engineering, University of Victoria, British Columbia, Canada; DOI: 10.4279/PIP.030002 Cite as: P. M. Jais, C. von Bilderling, A. V. Bragas, Papers in Physics 3, 030002 (2011)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2011-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009578","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}
We prepare static granular beds under gravity in different stationary states by tapping the system with pulsed excitations of controlled amplitude and duration. The macroscopic state---defined by the ensemble of static configurations explored by the system tap after tap---for a given tap intensity and duration is studied in terms of volume, , and force moment tensor, . In a previous paper [Pugnaloni et al., Phys. Rev. E 82, 050301(R) (2010)], we reported evidence supporting that such macroscopic states cannot be fully described by using only or , apart from the number of particles . In this work, we present an analysis of the fluctuations of these variables that indicates that and may be sufficient to define the macroscopic states. Moreover, we show that only one of the invariants of is necessary, since each component of falls onto a master curve when plotted as a function of . This implies that these granular assemblies have a common shape for the stress tensor, even though it does not correspond to the hydrostatic type. Although most results are obtained by molecular dynamics simulations, we present supporting experimental results. Received: 11 May 2011, Accepted: 15 July 2011; Edited by: J-C. Geminard; Reviewed by: B. Tighe, Instituut-Lorentz, Universiteit Leiden, Netherlands; DOI: http://dx.doi.org/10.4279/PIP.030004 Cite as: L. A. Pugnaloni, J. Damas, I. Zuriguel, D. Maza, Papers in Physics 3, 030004 (2011)
利用可控振幅和持续时间的脉冲激励，制备了重力作用下不同静止状态的静态颗粒床。宏观状态——由系统一次接一次的敲击所探索的静态构型的集合定义——在给定的敲击强度和持续时间下，用体积、、和力矩张量来研究。在之前的一篇论文中[Pugnaloni et al.]Rev. E 82, 050301(R)(2010)]，我们报告的证据支持这样的宏观状态不能完全通过使用或来描述，除了粒子的数量。在这项工作中，我们提出了对这些变量波动的分析，表明并且可能足以定义宏观状态。此外，我们证明了的不变量中只有一个是必要的，因为当作为的函数绘制时，的每个分量落在主曲线上。这意味着这些颗粒组合具有应力张量的共同形状，即使它不对应于流体静力型。虽然大多数结果是通过分子动力学模拟得到的，但我们提出了支持的实验结果。收稿日期:2011年5月11日，收稿日期:2011年7月15日;编辑:J-C。Geminard;审评人:B. Tighe，荷兰莱顿大学洛伦兹研究所;引用出处:L. A. Pugnaloni, J. Damas, I. Zuriguel, D. Maza, Papers in Physics 3,030004 (2011)
{"title":"Master curves for the stress tensor invariants in stationary states of static granular beds. Implications for the thermodynamic phase space","authors":"L. Pugnaloni, J. Damas, I. Zuriguel, D. Maza","doi":"10.4279/PIP.030004","DOIUrl":"https://doi.org/10.4279/PIP.030004","url":null,"abstract":"We prepare static granular beds under gravity in different stationary states by tapping the system with pulsed excitations of controlled amplitude and duration. The macroscopic state---defined by the ensemble of static configurations explored by the system tap after tap---for a given tap intensity and duration is studied in terms of volume, , and force moment tensor, . In a previous paper [Pugnaloni et al., Phys. Rev. E 82, 050301(R) (2010)], we reported evidence supporting that such macroscopic states cannot be fully described by using only or , apart from the number of particles . In this work, we present an analysis of the fluctuations of these variables that indicates that and may be sufficient to define the macroscopic states. Moreover, we show that only one of the invariants of is necessary, since each component of falls onto a master curve when plotted as a function of . This implies that these granular assemblies have a common shape for the stress tensor, even though it does not correspond to the hydrostatic type. Although most results are obtained by molecular dynamics simulations, we present supporting experimental results. Received: 11 May 2011, Accepted: 15 July 2011; Edited by: J-C. Geminard; Reviewed by: B. Tighe, Instituut-Lorentz, Universiteit Leiden, Netherlands; DOI: http://dx.doi.org/10.4279/PIP.030004 Cite as: L. A. Pugnaloni, J. Damas, I. Zuriguel, D. Maza, Papers in Physics 3, 030004 (2011)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2011-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009206","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}
A Commentary on the paper by H. E. Grecco and O. E. Martinez [ Pap. Phys. 2, 020010 (2010) ]. Received: 13 July 2010, Accepted: 10 January 2011; Edited by: V. Lakshminarayanan; DOI: 10.4279/PIP.020011
H. E.格列柯和O. E.马丁内斯论文评注[p.]物理学报，20010 (2010)[j]。收稿日期:2010年7月13日;收稿日期:2011年1月10日;编辑:V. Lakshminarayanan;DOI: 10.4279 / PIP.020011
{"title":"Commentary on \"Experimental determination of distance and orientation of metallic nanodimers by polarization dependent plasmon coupling\"","authors":"Sukhdev Roy","doi":"10.4279/PIP.020011","DOIUrl":"https://doi.org/10.4279/PIP.020011","url":null,"abstract":"A Commentary on the paper by H. E. Grecco and O. E. Martinez [ Pap. Phys. 2, 020010 (2010) ]. Received: 13 July 2010, Accepted: 10 January 2011; Edited by: V. Lakshminarayanan; DOI: 10.4279/PIP.020011","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2011-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009537","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}
Live cell imaging using metallic nanoparticles as tags is an emerging technique to visualize long and highly dynamic processes due to the lack of photobleaching and high photon rate. However, the lack of excited states as compared to fluorescent dyes prevents the use of resonance energy transfer and recently developed super resolution methods to measure distances between objects closer that the resolution limit. In this work, we experimentally demonstrate a technique to determine subdiffraction distances based on the near field coupling of metallic nanoparticles. Due to the symmetry breaking in the scattering cross section, not only distances but also relative orientations can be measured. Gold nanoparticles were prepared on glass in such way that a small fraction of dimers was present. The sample was sequentially illuminated with two wavelengths to separate background from nanoparticle scattering based on their spectral properties. A novel total internal reflection illumination scheme in which the polarization can be rotated was used to further minimize background contributions. In this way, radii, distance and orientation were measured for each individual dimer and their statistical distributions were found to be in agreement with the expected ones. We envision that this technique will allow fast and long term tracking of relative distance and orientation in biological processes. Received: 22 April 2010, Accepted: 2 December 2010; Edited by: V. Lakshminarayanan; Reviewed by: S. Roy, Dayalbagh Educational Institute, Agra, India; DOI: 10.4279/PIP.020010
{"title":"Experimental determination of distance and orientation of metallic nanodimers by polarization dependent plasmon coupling","authors":"H. Grecco, O. Mart'inez","doi":"10.4279/pip.020010","DOIUrl":"https://doi.org/10.4279/pip.020010","url":null,"abstract":"Live cell imaging using metallic nanoparticles as tags is an emerging technique to visualize long and highly dynamic processes due to the lack of photobleaching and high photon rate. However, the lack of excited states as compared to fluorescent dyes prevents the use of resonance energy transfer and recently developed super resolution methods to measure distances between objects closer that the resolution limit. In this work, we experimentally demonstrate a technique to determine subdiffraction distances based on the near field coupling of metallic nanoparticles. Due to the symmetry breaking in the scattering cross section, not only distances but also relative orientations can be measured. Gold nanoparticles were prepared on glass in such way that a small fraction of dimers was present. The sample was sequentially illuminated with two wavelengths to separate background from nanoparticle scattering based on their spectral properties. A novel total internal reflection illumination scheme in which the polarization can be rotated was used to further minimize background contributions. In this way, radii, distance and orientation were measured for each individual dimer and their statistical distributions were found to be in agreement with the expected ones. We envision that this technique will allow fast and long term tracking of relative distance and orientation in biological processes. Received: 22 April 2010, Accepted: 2 December 2010; Edited by: V. Lakshminarayanan; Reviewed by: S. Roy, Dayalbagh Educational Institute, Agra, India; DOI: 10.4279/PIP.020010","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2011-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009517","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}
We numerically study the geometry of a driven elastic string at its sample-dependent depinning threshold in random-periodic media. We find that the anisotropic finite-size scaling of the average square width and of its associated probability distribution are both controlled by the ratio , where is the random-manifold depinning roughness exponent, is the longitudinal size of the string and the transverse periodicity of the random medium. The rescaled average square width displays a non-trivial single minimum for a finite value of . We show that the initial decrease for small reflects the crossover at from the random-periodic to the random-manifold roughness. The increase for very large implies that the increasingly rare critical configurations, accompanying the crossover to Gumbel critical-force statistics, display anomalous roughness properties: a transverse-periodicity scaling in spite that , and subleading corrections to the standard random-manifold longitudinal-size scaling. Our results are relevant to understanding the dimensional crossover from interface to particle depinning. Received: 20 October 2010, Accepted: 1 December 2010; Edited by: A. Vindigni; Reviewed by: A. A. Fedorenko, CNRS-Lab. de Physique, ENS de Lyon, France; DOI: 10.4279/PIP.020008
本文用数值方法研究了随机周期介质中受驱动弹性弦在样本依赖的脱紧阈值处的几何特性。我们发现平均平方宽度的各向异性有限尺度及其相关的概率分布都由比值控制，其中为随机流形脱孔粗糙度指数，为弦的纵向尺寸和随机介质的横向周期性。重新缩放的平均平方宽度显示有限值的非平凡单个最小值。结果表明，小的初始减小反映了从随机周期到随机流形粗糙度的交叉。非常大的增加意味着越来越罕见的临界构型，伴随着与Gumbel临界力统计的交叉，显示出异常的粗糙度特性:尽管如此，横向周期性标度，以及对标准随机流形纵向尺寸标度的次级修正。我们的结果与理解从界面到粒子脱屑的维度交叉有关。收稿日期:2010年10月20日，收稿日期:2010年12月1日;编辑:A. Vindigni;审稿人:A. A. Fedorenko, CNRS-Lab。de体质，里昂高等教育学院，法国;DOI: 10.4279 / PIP.020008
{"title":"Anisotropic finite-size scaling of an elastic string at the depinning threshold in a random-periodic medium","authors":"S. Bustingorry, A. Kolton","doi":"10.4279/pip.020008","DOIUrl":"https://doi.org/10.4279/pip.020008","url":null,"abstract":"We numerically study the geometry of a driven elastic string at its sample-dependent depinning threshold in random-periodic media. We find that the anisotropic finite-size scaling of the average square width and of its associated probability distribution are both controlled by the ratio , where is the random-manifold depinning roughness exponent, is the longitudinal size of the string and the transverse periodicity of the random medium. The rescaled average square width displays a non-trivial single minimum for a finite value of . We show that the initial decrease for small reflects the crossover at from the random-periodic to the random-manifold roughness. The increase for very large implies that the increasingly rare critical configurations, accompanying the crossover to Gumbel critical-force statistics, display anomalous roughness properties: a transverse-periodicity scaling in spite that , and subleading corrections to the standard random-manifold longitudinal-size scaling. Our results are relevant to understanding the dimensional crossover from interface to particle depinning. Received: 20 October 2010, Accepted: 1 December 2010; Edited by: A. Vindigni; Reviewed by: A. A. Fedorenko, CNRS-Lab. de Physique, ENS de Lyon, France; DOI: 10.4279/PIP.020008","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2010-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009472","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}
As a fragile construction, a granular pile is very sensitive to minute external perturbations. In particular, it is now well established that a granular assembly is sensitive to variations of temperature. Such variations can produce localized rearrangements as well as global static avalanches inside a pile. In this review, we sum up the various observations that have been made concerning the effect of temperature on a granular assembly. In particular, we dwell on the way controlled variations of temperature have been employed to generate the compaction of a granular pile. After laying emphasis on the key features of this compaction process, we compare it to the classic vibration-induced compaction. Finally, we also review other textit{granular systems} in a large sense, from microscopic (jammed multilamellar vesicles) to macroscopic scales (stone heave phenomenon linked to freezing and thawing of soils) for which periodic variations of temperature could play a key role in the dynamics at stake. Received: 10 August 2010; Accepted: 28 October 2010; Edited by: I. Ippolito; Reviewed by: A. Coniglio, Universita di Napoli “Federico II”, Napoli, Italy ; DOI: 10.4279/PIP.020006 Editor's Note: Some figures in this paper are reprinted with permission from Wiley-VCH Verlag, the American Physcal Society, Elsevier and the Nature Publishing Group. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the abovementioned editorial organizations.
{"title":"Invited review: Effect of temperature on a granular pile","authors":"T. Divoux","doi":"10.4279/pip.020006","DOIUrl":"https://doi.org/10.4279/pip.020006","url":null,"abstract":"As a fragile construction, a granular pile is very sensitive to minute external perturbations. In particular, it is now well established that a granular assembly is sensitive to variations of temperature. Such variations can produce localized rearrangements as well as global static avalanches inside a pile. In this review, we sum up the various observations that have been made concerning the effect of temperature on a granular assembly. In particular, we dwell on the way controlled variations of temperature have been employed to generate the compaction of a granular pile. After laying emphasis on the key features of this compaction process, we compare it to the classic vibration-induced compaction. Finally, we also review other textit{granular systems} in a large sense, from microscopic (jammed multilamellar vesicles) to macroscopic scales (stone heave phenomenon linked to freezing and thawing of soils) for which periodic variations of temperature could play a key role in the dynamics at stake. Received: 10 August 2010; Accepted: 28 October 2010; Edited by: I. Ippolito; Reviewed by: A. Coniglio, Universita di Napoli “Federico II”, Napoli, Italy ; DOI: 10.4279/PIP.020006 Editor's Note: Some figures in this paper are reprinted with permission from Wiley-VCH Verlag, the American Physcal Society, Elsevier and the Nature Publishing Group. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the abovementioned editorial organizations.","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2010-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009366","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}
A Commentary on the paper by T. Divoux [Pap. Phys. 2, 020006 (2010)]. Received: 10 November 2010, Accepted: 12 November 2010; Edited by: I. Ippolito; DOI: 10.4279/PIP.020007
T. Divoux对论文的评论[p.]物理学报，2000,06 (2010)[j]。收稿日期:2010年11月10日，收稿日期:2010年11月12日;编辑:I. Ippolito;DOI: 10.4279 / PIP.020007
{"title":"Commentary on “Effect of temperature on a granular pile”","authors":"A. Coniglio, M. Ciamarra","doi":"10.4279/PIP.020007","DOIUrl":"https://doi.org/10.4279/PIP.020007","url":null,"abstract":"A Commentary on the paper by T. Divoux [Pap. Phys. 2, 020006 (2010)]. Received: 10 November 2010, Accepted: 12 November 2010; Edited by: I. Ippolito; DOI: 10.4279/PIP.020007","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2010-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009453","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}
A Commentary on the paper by L. P. Kadanoff [Pap. Phys. 2, 020003 (2010)]. Received: 29 September 2010, Accepted: 4 October 2010; Edited by: A. G. Green; DOI: 10.4279/PIP.020004
{"title":"Commentary on \"Expansions for Eigenfunctions and Eigenvalues of large- Toeplitz Matrices\"","authors":"T. Ehrhardt","doi":"10.4279/PIP.020004","DOIUrl":"https://doi.org/10.4279/PIP.020004","url":null,"abstract":"A Commentary on the paper by L. P. Kadanoff [Pap. Phys. 2, 020003 (2010)]. Received: 29 September 2010, Accepted: 4 October 2010; Edited by: A. G. Green; DOI: 10.4279/PIP.020004","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2010-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009250","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}
Biological networks of interacting agents exhibit similar topological properties for a wide range of scales, from cellular to ecological levels, suggesting the existence of a common evolutionary origin. A general evolutionary mechanism based on global stability has been proposed recently [J I Perotti, et al., Phys. Rev. Lett. 103, 108701 (2009)]. This mechanism was incorporated into a model of a growing network of interacting agents in which each new agent's membership in the network is determined by the agent's effect on the network's global stability. In this work, we analyze different quantities that characterize the topology of the emerging networks, such as global connectivity, clustering and average nearest neighbors degree, showing that they reproduce scaling behaviors frequently observed in several biological systems. The influence of the stability selection mechanism on the dynamics associated to the resulting network, as well as the interplay between some topological and functional features are also analyzed. Received: 17 July 2010; Accepted: 27 September 2010; Edited by: D. H. Zanette; Reviewed by: V. M. Eguiluz, Inst. Fisica Interdisciplinar y Sist. Complejos, Palma de Mallorca, Spain; DOI: 10.4279/PIP.020005
从细胞到生态水平，相互作用的生物网络在广泛的尺度上表现出相似的拓扑特性，表明存在共同的进化起源。最近提出了一种基于全局稳定性的一般进化机制[J] Perotti, et al.， Phys。[j].科学通报，2009(1)。这种机制被纳入到一个不断增长的相互作用的代理网络模型中，其中每个新代理在网络中的成员资格取决于代理对网络全局稳定性的影响。在这项工作中，我们分析了表征新兴网络拓扑结构的不同数量，如全局连通性、聚类和平均最近邻度，表明它们再现了在几个生物系统中经常观察到的缩放行为。分析了稳定性选择机制对网络动力学的影响，以及一些拓扑特征和功能特征之间的相互作用。收稿日期:2010年7月17日;录用日期:2010年9月27日;编辑:d.h. Zanette;审评人:V. M. Eguiluz, institute of Fisica interdisciplinary Sist。西班牙马略卡岛帕尔马的Complejos;DOI: 10.4279 / PIP.020005
{"title":"Stability as a natural selection mechanism on interacting networks","authors":"J. I. Perotti, O. Billoni, F. Tamarit, S. Cannas","doi":"10.4279/PIP.020005","DOIUrl":"https://doi.org/10.4279/PIP.020005","url":null,"abstract":"Biological networks of interacting agents exhibit similar topological properties for a wide range of scales, from cellular to ecological levels, suggesting the existence of a common evolutionary origin. A general evolutionary mechanism based on global stability has been proposed recently [J I Perotti, et al., Phys. Rev. Lett. 103, 108701 (2009)]. This mechanism was incorporated into a model of a growing network of interacting agents in which each new agent's membership in the network is determined by the agent's effect on the network's global stability. In this work, we analyze different quantities that characterize the topology of the emerging networks, such as global connectivity, clustering and average nearest neighbors degree, showing that they reproduce scaling behaviors frequently observed in several biological systems. The influence of the stability selection mechanism on the dynamics associated to the resulting network, as well as the interplay between some topological and functional features are also analyzed. Received: 17 July 2010; Accepted: 27 September 2010; Edited by: D. H. Zanette; Reviewed by: V. M. Eguiluz, Inst. Fisica Interdisciplinar y Sist. Complejos, Palma de Mallorca, Spain; DOI: 10.4279/PIP.020005","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2010-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009308","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}
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