Pub Date : 2024-04-15DOI: 10.1209/0295-5075/ad3ead
Chunyan Zhang, Ziheng Wang
The ubiquity of labor division within diverse social collectives is a topic well captured by evolutionary game theory. This work offers an integrative review of the evolutionary dynamics underpinning such division of labor from a tripartite standpoint—commencing with a theoretical exposition on numerous archetypes of labor division games. Subsequently, we delineate a suite of control strategies formulated to not only realize but also sustain the phenomenon of division of labor. This is followed by an elucidation of practical implementations pertaining to the allocation of tasks and labor division, grounded in the principles of game theory. We culminate with the proposition of prospective avenues and insightful trajectories for future investigations, cultivating a frontier for the continued exploration within this field.
{"title":"Evolutionary dynamic of division of labor games","authors":"Chunyan Zhang, Ziheng Wang","doi":"10.1209/0295-5075/ad3ead","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3ead","url":null,"abstract":"\u0000 The ubiquity of labor division within diverse social collectives is a topic well captured by evolutionary game theory. This work offers an integrative review of the evolutionary dynamics underpinning such division of labor from a tripartite standpoint—commencing with a theoretical exposition on numerous archetypes of labor division games. Subsequently, we delineate a suite of control strategies formulated to not only realize but also sustain the phenomenon of division of labor. This is followed by an elucidation of practical implementations pertaining to the allocation of tasks and labor division, grounded in the principles of game theory. We culminate with the proposition of prospective avenues and insightful trajectories for future investigations, cultivating a frontier for the continued exploration within this field.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140702444","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}
Pub Date : 2024-04-12DOI: 10.1209/0295-5075/ad3e27
Xing Yan, Siyuan Song, G. Diebold
Although the photoacoustic effect is most commonly generated by pulsed or amplitude modulated continuous optical sources, it is possible to generate acoustic waves by moving a constant amplitude, continuous light beam. If the light beam moves at the speed of sound, an amplification effect takes place which can be used in trace gas detection. Here, the properties of the photoacoustic effect are investigated for a continuous optical beam moving in a one-dimensional resonator. The solution shows the additive effects of sweeping the optical beam the length of the cell and back.
{"title":"Photoacoustic effect from an oscillating source in a one-dimensional resonator","authors":"Xing Yan, Siyuan Song, G. Diebold","doi":"10.1209/0295-5075/ad3e27","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3e27","url":null,"abstract":"\u0000 Although the photoacoustic effect is most commonly generated by pulsed or amplitude modulated continuous optical sources, it is possible to generate acoustic waves by moving a constant amplitude, continuous light beam. If the light beam moves at the speed of sound, an amplification effect takes place which can be used in trace gas detection. Here, the properties of the photoacoustic effect are investigated for a continuous optical beam moving in a one-dimensional resonator. The solution shows the additive effects of sweeping the optical beam the length of the cell and back.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140708680","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}
Pub Date : 2024-04-04DOI: 10.1209/0295-5075/ad3a9a
Ellen K. Luckins, Christopher Breward, Ian Griffiths, Colin Please
We consider a liquid containing impurities saturating a porous material; when the liquid evaporates, the impurities are deposited within the material. Applications include filtration and waterproof textiles. We present a mathematical model incorporating coupling between evaporation, accumulation and transport of the impurities, and the impact of the deposited impurities on the transport of both the suspended impurities and the liquid vapour. By simulating our model numerically, we investigate the role of temperature and repeated drying cycles on the location of the deposited impurities. Higher temperatures increase the evaporation rate so that impurities are transported further into porous material before depositing than for lower temperatures. We quantify two distinct parameter regimes in which the material clogs: (i) the dry-clogging (high-temperature) regime, in which impurities are pushed far into the material before clogging, and (ii) the wet-clogging (high-impurity) regime, in which liquid becomes trapped by the clogging. Clogging restricts the extent to which drying time can be reduced by increasing the temperature.
{"title":"The role of temperature and drying cycles on impurity deposition in drying porous media","authors":"Ellen K. Luckins, Christopher Breward, Ian Griffiths, Colin Please","doi":"10.1209/0295-5075/ad3a9a","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3a9a","url":null,"abstract":"\u0000 We consider a liquid containing impurities saturating a porous material; when the liquid evaporates, the impurities are deposited within the material. Applications include filtration and waterproof textiles. We present a mathematical model incorporating coupling between evaporation, accumulation and transport of the impurities, and the impact of the deposited impurities on the transport of both the suspended impurities and the liquid vapour. By simulating our model numerically, we investigate the role of temperature and repeated drying cycles on the location of the deposited impurities. Higher temperatures increase the evaporation rate so that impurities are transported further into porous material before depositing than for lower temperatures. We quantify two distinct parameter regimes in which the material clogs: (i) the dry-clogging (high-temperature) regime, in which impurities are pushed far into the material before clogging, and (ii) the wet-clogging (high-impurity) regime, in which liquid becomes trapped by the clogging. Clogging restricts the extent to which drying time can be reduced by increasing the temperature.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"26 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140743717","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}
Pub Date : 2024-04-04DOI: 10.1209/0295-5075/ad3a99
Akshat Pandey
In this short paper we make use of the recent covariant extension of the generalised uncertainty principle to study the corrections to the vacuum energy of the simplest scalar quantum field theory. We then calculate the modifications to the Casimir effect that such a correction to the vacuum energy would bring about. We emphasise that these corrections are indeed physical.
{"title":"Relativistic generalised uncertainty and the corrected vacuum energy","authors":"Akshat Pandey","doi":"10.1209/0295-5075/ad3a99","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3a99","url":null,"abstract":"\u0000 In this short paper we make use of the recent covariant extension of the generalised uncertainty principle to study the corrections to the vacuum energy of the simplest scalar quantum field theory. We then calculate the modifications to the Casimir effect that such a correction to the vacuum energy would bring about. We emphasise that these corrections are indeed physical.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"11 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140744116","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}
Pub Date : 2024-04-04DOI: 10.1209/0295-5075/ad3a9b
K. Bakke
Based on the power-exponential potential, we study the confinement of a particle to a spherical quantum dot under the influence of a linear scalar potential. We show that the energy eigenvalues $s$-waves can be obtained from approximate solutions to the Schrödinger equation. Further, we consider the global monopole spacetime and study the topological effects of this spacetime background on the confinement of a particle to a spherical quantum dot under the influence of a linear scalar potential.
{"title":"Spherical quantum dot described by a scalar exponential potential under the influence of a linear scalar potential and a global monopole","authors":"K. Bakke","doi":"10.1209/0295-5075/ad3a9b","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3a9b","url":null,"abstract":"\u0000 Based on the power-exponential potential, we study the confinement of a particle to a spherical quantum dot under the influence of a linear scalar potential. We show that the energy eigenvalues $s$-waves can be obtained from approximate solutions to the Schrödinger equation. Further, we consider the global monopole spacetime and study the topological effects of this spacetime background on the confinement of a particle to a spherical quantum dot under the influence of a linear scalar potential.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"57 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140743190","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}
Pub Date : 2024-04-03DOI: 10.1209/0295-5075/ad3a0f
Zhiang Linghu, Qiujiao Du, Yawen Shen, Hongwu Yang, Pai Peng, Fengming Liu
Differing from electromagnetic and acoustic waves, the governing equation for elastic waves in flexural plates is not form invariant, hindering straightforward cloak design based on coordinate transformation theory. In this work, we propose a novel idea instead of approximately equivalent transformation method, and employ scattering cancellation techniques to design a multi-layer cylindrical structure for achieving flexural wave cloaking at desired target frequencies. Moreover, we use deep learning to effectively address the time consuming issue dealing with fine-tuning design parameters for the desired response. More importantly, we adopt a method based on a tandem neural network to tackle the one-to-many mapping challenge in inverse design. It not only accurately predicts the scattering spectra of multi-layer structures in advance but also efficiently performs inverse design to obtain the required design parameters for arbitrary target frequency cloaking.
{"title":"Arbitrary target frequency cloaking for flexural waves using deep learning","authors":"Zhiang Linghu, Qiujiao Du, Yawen Shen, Hongwu Yang, Pai Peng, Fengming Liu","doi":"10.1209/0295-5075/ad3a0f","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3a0f","url":null,"abstract":"\u0000 Differing from electromagnetic and acoustic waves, the governing equation for elastic waves in flexural plates is not form invariant, hindering straightforward cloak design based on coordinate transformation theory. In this work, we propose a novel idea instead of approximately equivalent transformation method, and employ scattering cancellation techniques to design a multi-layer cylindrical structure for achieving flexural wave cloaking at desired target frequencies. Moreover, we use deep learning to effectively address the time consuming issue dealing with fine-tuning design parameters for the desired response. More importantly, we adopt a method based on a tandem neural network to tackle the one-to-many mapping challenge in inverse design. It not only accurately predicts the scattering spectra of multi-layer structures in advance but also efficiently performs inverse design to obtain the required design parameters for arbitrary target frequency cloaking.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"117 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140750712","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}
Pub Date : 2024-04-03DOI: 10.1209/0295-5075/ad3a11
Liuxian Zhao, Yining Liu, Bin Liao, Feng Liu, Zhaoyong Sun
This paper proposes a resonant type acoustic black hole (ABH). The ABH is achieved with gradient refractive index varies from the center of the lens to its outer surface. The performance of wave focusing and vibration reduction via the ABH is explored theoretically and numerically. Results show that the designed ABH can achieve wave focusing inside the lens and provide good vibration reduction at low frequency.
{"title":"Resonant pillar-type acoustic black hole for ultralow frequency vibration reduction","authors":"Liuxian Zhao, Yining Liu, Bin Liao, Feng Liu, Zhaoyong Sun","doi":"10.1209/0295-5075/ad3a11","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3a11","url":null,"abstract":"\u0000 This paper proposes a resonant type acoustic black hole (ABH). The ABH is achieved with gradient refractive index varies from the center of the lens to its outer surface. The performance of wave focusing and vibration reduction via the ABH is explored theoretically and numerically. Results show that the designed ABH can achieve wave focusing inside the lens and provide good vibration reduction at low frequency.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"105 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140750865","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}
Pub Date : 2024-04-03DOI: 10.1209/0295-5075/ad3a10
Yu Wang, Zhonglong Zhao, Yufeng Zhang
In this paper, the N-periodic wave solutions of the negative-order Korteweg-de Vries equations are presented, which can be used to describe wave phenomena in the water waves and plasma waves. Combining the bilinear Bäklund transformation with the Riemann-theta function, the N-periodic wave solutions can be obtained. Employing the parity of the bilinear forms for the Bäklund transformation, the complexity of the calculation can be reduced. The difficulty of solving N-periodic wave solutions can be transformed into solving least square problems. The Gauss-Newton numerical algorithm is employed to solve this kind of problem. Furthermore, the characteristic lines are used to analyze quantitatively the quasi-periodic solutions. The characteristic line analysis method is specifically demonstrated in the case of N=3. Some examples of numerical simulations for the 3-periodic and 4-periodic waves are presented. It is proved that this method can be further extended to the N-periodic wave solutions.
本文提出了负阶 Korteweg-de Vries 方程的 N 周期波解，可用于描述水波和等离子体波中的波现象。结合双线性 Bäklund 变换和黎曼-θ 函数，可以得到 N 周期波解。利用 Bäklund 变换的双线性形式的奇偶性，可以降低计算的复杂性。求解 N 周期波解的难度可以转化为求解最小平方问题。高斯-牛顿数值算法可用于解决此类问题。此外，还利用特征线对准周期解进行定量分析。特征线分析方法在 N=3 的情况下进行了具体演示。介绍了一些 3 周期波和 4 周期波的数值模拟实例。结果证明，这种方法可以进一步扩展到 N 周期波解。
{"title":"Numerical calculation of N-periodic wave solutions of the negative-order Korteweg-de Vries equations","authors":"Yu Wang, Zhonglong Zhao, Yufeng Zhang","doi":"10.1209/0295-5075/ad3a10","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3a10","url":null,"abstract":"\u0000 In this paper, the N-periodic wave solutions of the negative-order Korteweg-de Vries equations are presented, which can be used to describe wave phenomena in the water waves and plasma waves. Combining the bilinear Bäklund transformation with the Riemann-theta function, the N-periodic wave solutions can be obtained. Employing the parity of the bilinear forms for the Bäklund transformation, the complexity of the calculation can be reduced. The difficulty of solving N-periodic wave solutions can be transformed into solving least square problems. The Gauss-Newton numerical algorithm is employed to solve this kind of problem. Furthermore, the characteristic lines are used to analyze quantitatively the quasi-periodic solutions. The characteristic line analysis method is specifically demonstrated in the case of N=3. Some examples of numerical simulations for the 3-periodic and 4-periodic waves are presented. It is proved that this method can be further extended to the N-periodic wave solutions.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"85 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140750718","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}
Pub Date : 2024-03-27DOI: 10.1209/0295-5075/ad2e79
Charles Andrew Downing, M. S. Ukhtary
The challenge of storing energy efficiently and sustainably is highly prominent within modern scientific investigations. Due to the ongoing trend of miniaturization, the design of expressly quantum storage devices is itself a crucial task within current quantum technological research. Here we provide a transparent analytic model of a two-component quantum battery, composed of a charger and an energy holder, which is driven by a short laser pulse. We provide simple expressions for the energy stored in the battery, the maximum amount of work which can be extracted, both the instantaneous and the average powers, and the relevant charging times. This allows us to discuss explicitly the optimal design of the battery in terms of the driving strength of the pulse, the coupling between the charger and the holder, and the inevitable energy loss into the environment. We anticipate that our theory can act as a helpful guide for the nascent experimental work building and characterizing the first generation of truly quantum batteries.
{"title":"Energetics of a pulsed quantum battery","authors":"Charles Andrew Downing, M. S. Ukhtary","doi":"10.1209/0295-5075/ad2e79","DOIUrl":"https://doi.org/10.1209/0295-5075/ad2e79","url":null,"abstract":"\u0000 The challenge of storing energy efficiently and sustainably is highly prominent within modern scientific investigations. Due to the ongoing trend of miniaturization, the design of expressly quantum storage devices is itself a crucial task within current quantum technological research. Here we provide a transparent analytic model of a two-component quantum battery, composed of a charger and an energy holder, which is driven by a short laser pulse. We provide simple expressions for the energy stored in the battery, the maximum amount of work which can be extracted, both the instantaneous and the average powers, and the relevant charging times. This allows us to discuss explicitly the optimal design of the battery in terms of the driving strength of the pulse, the coupling between the charger and the holder, and the inevitable energy loss into the environment. We anticipate that our theory can act as a helpful guide for the nascent experimental work building and characterizing the first generation of truly quantum batteries.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140377105","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}
Pub Date : 2024-03-26DOI: 10.1209/0295-5075/ad37d6
P. Varotsos, N. Sarlis, E. Skordas
Upon employing the new concept of time, termed natural time, the analysis of seismicity reveals that, before major earthquakes, the variations of the Earth's electric and/or magnetic field are accompanied by increase of the fluctuations of the entropy change of seismicity under time reversal as well as by decrease of the fluctuations of the seismicity order parameter. Hence, natural time analysis reveals that before major earthquakes independent datasets of different geophysical observables (seismicity, Earth's magnetic and/or electric field) exhibit changes, which are observed simultaneously.
{"title":"Direct interconnection of seismicity with variations of the Earth's electric and magnetic field before major earthquakes","authors":"P. Varotsos, N. Sarlis, E. Skordas","doi":"10.1209/0295-5075/ad37d6","DOIUrl":"https://doi.org/10.1209/0295-5075/ad37d6","url":null,"abstract":"\u0000 Upon employing the new concept of time, termed natural time, the analysis of seismicity reveals that, before major earthquakes, the variations of the Earth's electric and/or magnetic field are accompanied by increase of the fluctuations of the entropy change of seismicity under time reversal as well as by decrease of the fluctuations of the seismicity order parameter. Hence, natural time analysis reveals that before major earthquakes independent datasets of different geophysical observables (seismicity, Earth's magnetic and/or electric field) exhibit changes, which are observed simultaneously.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"13 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140378766","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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