Manuel Angel González Delagado, César Llamas Bello, Jesús Vegas, M. A. G. Rebollo
An open-source platform to be used in high school or university laboratories has been developed. The platform permits the performance of dynamics experiments in a simple and affordable way, combining measurements of different sensors in the platform. The sensors are controlled by an Arduino microcontroller, which can be wirelessly accessed with smartphones or tablets. The platform constitutes an economical sensing alternative to commercial configurations and can easily be extended by including new sensors that broaden the range of covered experiments. Received: 7 September 2017, Accepted: 1 March 2018; Edited by: A. Marti, M. Monteiro; Reviewed by: E. Arribas, Universidad de Castilla La Mancha, Albacete, Spain; DOI: http://dx.doi.org/10.4279/PIP.100004 Cite as: C LLamas, Jesus Vega, M A Gonzalez, M A Gonzalez, Papers in Physics 10, 100004 (2018) This paper, by C Llamas, Jesus Vegas, M A Gonzalez, M A Gonzalez , is licensed under the Creative Commons Attribution License 4.0 .
已经开发了一个用于高中或大学实验室的开源平台。该平台允许以简单且经济实惠的方式进行动力学实验，结合平台中不同传感器的测量结果。传感器由Arduino微控制器控制，可以通过智能手机或平板电脑无线访问。该平台是商业配置的经济传感替代方案，可以通过包括新的传感器来轻松扩展，从而拓宽所涵盖的实验范围。接收日期：2017年9月7日，接受日期：2018年3月1日；编辑：A.Marti，M.Monteiro；审核人：E.Arribas，西班牙阿尔巴塞特卡斯蒂利亚-拉曼恰大学；DOI：http://dx.doi.org/10.4279/PIP.100004引用为：C LLamas，Jesus Vega，M A Gonzalez，M A冈萨雷斯，《物理学论文》10，100004（2018）这篇论文由C LLamas，耶稣·维加斯，M A贡萨雷斯，M A贡萨雷斯撰写，根据知识共享归因许可证4.0获得许可。
{"title":"Open-source sensors system for doing simple physics experiments","authors":"Manuel Angel González Delagado, César Llamas Bello, Jesús Vegas, M. A. G. Rebollo","doi":"10.4279/PIP.100004","DOIUrl":"https://doi.org/10.4279/PIP.100004","url":null,"abstract":"An open-source platform to be used in high school or university laboratories has been developed. The platform permits the performance of dynamics experiments in a simple and affordable way, combining measurements of different sensors in the platform. The sensors are controlled by an Arduino microcontroller, which can be wirelessly accessed with smartphones or tablets. The platform constitutes an economical sensing alternative to commercial configurations and can easily be extended by including new sensors that broaden the range of covered experiments. Received: 7 September 2017, Accepted: 1 March 2018; Edited by: A. Marti, M. Monteiro; Reviewed by: E. Arribas, Universidad de Castilla La Mancha, Albacete, Spain; DOI: http://dx.doi.org/10.4279/PIP.100004 Cite as: C LLamas, Jesus Vega, M A Gonzalez, M A Gonzalez, Papers in Physics 10, 100004 (2018) This paper, by C Llamas, Jesus Vegas, M A Gonzalez, M A Gonzalez , is licensed under the Creative Commons Attribution License 4.0 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2018-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49633641","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}
The audio port of a smartphone is designed to send and receive audio but can be harnessed for portable, economical, and accurate data collection from a variety of sources. While smartphones have internal sensors to measure a number of physical phenomena such as acceleration, magnetism and illumination levels, measurement of other phenomena such as voltage, external temperature, or accurate timing of moving objects are excluded. The audio port cannot be only employed to sense external phenomena. It has the additional advantage of timing precision; because audio is recorded or played at a controlled rate separated from other smartphone activities, timings based on audio can be highly accurate. The following outlines unpublished details of the audio port technical elements for data collection, a general data collection recipe and an example timing application for Android devices. Received: 5 January 2018, Accepted: 20 April 2018; Edited by: A. Marti, M. Monteiro; Reviewed by: P. Jeanjacquot, Ecole Normale Superieure de Lyon – Institut Francais de lEducation, France; DOI: http://dx.doi.org/10.4279/PIP.100006 Cite as: K Forinash, R Wisman, Papers in Physics 10, 100006 (2018) This paper, by K Forinash, R Wisman , is licensed under the Creative Commons Attribution License 4.0 .
{"title":"Smartphone audio port data collection cookbook","authors":"K. Forinash, R. Wisman","doi":"10.4279/PIP.100006","DOIUrl":"https://doi.org/10.4279/PIP.100006","url":null,"abstract":"The audio port of a smartphone is designed to send and receive audio but can be harnessed for portable, economical, and accurate data collection from a variety of sources. While smartphones have internal sensors to measure a number of physical phenomena such as acceleration, magnetism and illumination levels, measurement of other phenomena such as voltage, external temperature, or accurate timing of moving objects are excluded. The audio port cannot be only employed to sense external phenomena. It has the additional advantage of timing precision; because audio is recorded or played at a controlled rate separated from other smartphone activities, timings based on audio can be highly accurate. The following outlines unpublished details of the audio port technical elements for data collection, a general data collection recipe and an example timing application for Android devices. Received: 5 January 2018, Accepted: 20 April 2018; Edited by: A. Marti, M. Monteiro; Reviewed by: P. Jeanjacquot, Ecole Normale Superieure de Lyon – Institut Francais de lEducation, France; DOI: http://dx.doi.org/10.4279/PIP.100006 Cite as: K Forinash, R Wisman, Papers in Physics 10, 100006 (2018) This paper, by K Forinash, R Wisman , is licensed under the Creative Commons Attribution License 4.0 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2018-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49062460","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}
In this paper we describe a classical experiment with an air track in which smartphones are used as experimental devices to obtain physical data. The proposed experiment allows users to easily observe and measure relationships between physical magnitudes, conservation of momentum in collisions and friction effects on movement by utilizing the users' own mobile devices. Received: 20 September 2017, Accepted: 4 May 2018; Edited by: A. Marti, M. Monteiro; Reviewed by: J-L Richter, Lycee Polyvalent J-B Schwilgue, France; DOI: http://dx.doi.org/10.4279/PIP.100005 Cite as: M A Gonzalez, A Gomez, M A Gonzalez, Papers in Physics 10, 100005 (2018) This paper, by M A Gonzalez, A Gomez, M A Gonzalez , is licensed under the Creative Commons Attribution License 4.0 .
在本文中，我们描述了一个经典的实验与空气轨道，其中智能手机被用作实验设备，以获得物理数据。所提出的实验允许用户通过使用自己的移动设备轻松地观察和测量物理大小，碰撞动量守恒和摩擦对运动的影响之间的关系。收稿日期:2017年9月20日，收稿日期:2018年5月4日;编辑:A.马蒂，M.蒙泰罗;综述:J-L Richter, Lycee Polyvalent J-B Schwilgue, France;本文作者为M A Gonzalez, A Gomez, M A Gonzalez, Papers in Physics 10,100005(2018)，采用知识共享署名许可4.0协议。
{"title":"Smartphones on the air track. Examples and difficulties","authors":"M. Delgado, Alfonso Gómez, M. A. G. Rebollo","doi":"10.4279/PIP.100005","DOIUrl":"https://doi.org/10.4279/PIP.100005","url":null,"abstract":"In this paper we describe a classical experiment with an air track in which smartphones are used as experimental devices to obtain physical data. The proposed experiment allows users to easily observe and measure relationships between physical magnitudes, conservation of momentum in collisions and friction effects on movement by utilizing the users' own mobile devices. Received: 20 September 2017, Accepted: 4 May 2018; Edited by: A. Marti, M. Monteiro; Reviewed by: J-L Richter, Lycee Polyvalent J-B Schwilgue, France; DOI: http://dx.doi.org/10.4279/PIP.100005 Cite as: M A Gonzalez, A Gomez, M A Gonzalez, Papers in Physics 10, 100005 (2018) This paper, by M A Gonzalez, A Gomez, M A Gonzalez , is licensed under the Creative Commons Attribution License 4.0 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2018-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71010979","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 G. C. Dima et al. [Pap. Phys. 10, 100002 (2018)]. Received: 8 January 2018, Accepted: 11 January 2018; Edited by: A. Marti; DOI: http://dx.doi.org/10.4279/PIP.100003 Cite as: Y S Zhang, Papers in Physics 10, 100003 (2018) This paper, by Y S Zhang , is licensed under the Creative Commons Attribution License 4.0 .
{"title":"Commentary on \"Modeling temperature manipulation in a circular model of birdsong production\"","authors":"Yisi S. Zhang","doi":"10.4279/PIP.100003","DOIUrl":"https://doi.org/10.4279/PIP.100003","url":null,"abstract":"A Commentary on the paper by G. C. Dima et al. [Pap. Phys. 10, 100002 (2018)]. Received: 8 January 2018, Accepted: 11 January 2018; Edited by: A. Marti; DOI: http://dx.doi.org/10.4279/PIP.100003 Cite as: Y S Zhang, Papers in Physics 10, 100003 (2018) This paper, by Y S Zhang , is licensed under the Creative Commons Attribution License 4.0 .","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2018-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45375730","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}
The nature of the neural mechanisms in the birdsong motor pathway that lead to the generation of respiratory patterns are a matter of extensive debate. In a top-down control paradigm, vocal gestures emerge from a unique timescale ruled by the telencephalic nucleus HVC, which engages other brain regions downstream. Another possibility is that the generation of motor instructions is distributed throughout the neural network, flowing both upstream and downstream. In this circular architecture, the song results from the integration of more than one timescale. In order to disambiguate these views, we used local focal cooling of HVC in canaries to manipulate the timescale present there. Within the frame of the circular model, we fitted the experimental pressure patterns of different types of syllables, which form a full song. We show that at least two separate timescales must be taken into account to reproduce them, one which is manipulated by cooling while the other remains unchanged. The modifications -stretching and breaking- of the syllables were quantitatively reproduced in this frame. Received: 8 September 2017, Accepted: 7 December 2017; Edited by: A. Marti; Reviewed by: Y. S. Zhang, Princeton Neuroscience Institute, Princeton, NJ, USA.; DOI: http://dx.doi.org/10.4279/PIP.100002 Cite as: G C Dima, M A Goldin, G B Mindlin, Papers in Physics 10, 100002 (2018) This paper, by G C Dima, M A Goldin, G B Mindlin , is licensed under the Creative Commons Attribution License 4.0 .
鸟鸣运动通路中导致呼吸模式产生的神经机制的性质是一个广泛争论的问题。在自上而下的控制范式中，语音手势产生于一个由远端脑核HVC控制的独特时间尺度，它与下游的其他大脑区域有关。另一种可能性是，运动指令的生成分布在整个神经网络中，上游和下游都有。在这个圆形建筑中，歌曲来自多个时间尺度的整合。为了消除这些观点的歧异，我们使用了金丝雀HVC的局部焦点冷却来操纵那里存在的时间尺度。在圆形模型的框架内，我们拟合了不同类型音节的实验压力模式，形成了一首完整的歌曲。我们表明，要重现它们，必须考虑至少两个独立的时间尺度，其中一个通过冷却来操纵，而另一个保持不变。音节的变化——伸展和断裂——在这个框架中被定量地再现。收稿日期:2017年9月8日，收稿日期:2017年12月7日;编辑:A. Marti;审稿人:张玉生，普林斯顿神经科学研究所，普林斯顿，新泽西，美国;本文作者:G C Dima, M A Goldin, G B Mindlin, Papers in Physics 10,100002(2018)，使用知识共享署名许可4.0。
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We study the competition between Kondo physics and indirect exchange on monolayer black phos-phorous using a realistic description of the band structure in combination with the density matrixrenormalization group (DMRG) method. The Hamiltonian is reduced to a one-dimensional problemvia an exact canonical transformation that makes it amenable to DMRG calculations, yielding exactresults that fully incorporate the many-body physics. We find that a perturbative description of theproblem is not appropriate and cannot account for the slow decay of the correlations and the completelack of ferromagnetism. In addition, at some particular distances, the impurities decouple formingtheir own independent Kondo states. This can be predicted from the nodes of the Lindhard function.Our results indicate a possible route toward realizing dilute anti-ferromagnetism in phosphorene. Received: 19 September 2017, Accepted: 12 October 2017; Edited by: K. Hallberg; DOI: http://dx.doi.org/10.4279/PIP.090008 Cite as: A Allerdt, A E Feiguin, Papers in Physics 9, 090008 (2017) This paper, by A Allerdt, A E Feiguin , is licensed under the Creative Commons Attribution License 3.0 .
本文结合密度矩阵重整化群(DMRG)方法，对单层黑色荧光粉的能带结构进行了真实描述，研究了近藤物理与间接交换之间的竞争关系。哈密顿量通过精确的正则变换简化为一维问题，使其适合DMRG计算，从而产生完全包含多体物理的精确结果。我们发现用微扰描述问题是不合适的，不能解释相关的缓慢衰减和铁磁性的完全缺乏。此外，在某些特定的距离上，杂质会解耦形成它们自己独立的近藤态。这可以通过Lindhard函数的节点来预测。我们的研究结果为实现磷烯的稀反铁磁性提供了一条可能的途径。收稿日期:2017年9月19日，收稿日期:2017年10月12日;编辑:K.霍尔伯格;A Allerdt, A E Feiguin, Papers in Physics 9, 090008(2017)本文由A Allerdt, A E Feiguin撰写，使用知识共享署名许可3.0协议。
{"title":"Dilute antiferromagnetism in magnetically doped phosphorene","authors":"A. Allerdt, A. Feiguin","doi":"10.4279/PIP.090008","DOIUrl":"https://doi.org/10.4279/PIP.090008","url":null,"abstract":"We study the competition between Kondo physics and indirect exchange on monolayer black phos-phorous using a realistic description of the band structure in combination with the density matrixrenormalization group (DMRG) method. The Hamiltonian is reduced to a one-dimensional problemvia an exact canonical transformation that makes it amenable to DMRG calculations, yielding exactresults that fully incorporate the many-body physics. We find that a perturbative description of theproblem is not appropriate and cannot account for the slow decay of the correlations and the completelack of ferromagnetism. In addition, at some particular distances, the impurities decouple formingtheir own independent Kondo states. This can be predicted from the nodes of the Lindhard function.Our results indicate a possible route toward realizing dilute anti-ferromagnetism in phosphorene. Received: 19 September 2017, Accepted: 12 October 2017; Edited by: K. Hallberg; DOI: http://dx.doi.org/10.4279/PIP.090008 Cite as: A Allerdt, A E Feiguin, Papers in Physics 9, 090008 (2017) This paper, by A Allerdt, A E Feiguin , 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":"2017-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42851161","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}
Precise measurement of the Dalitz plot parameters of the decay gives a better insight of the dynamics of the heavy pseudo-scalar meson. Various measurements of the Dalitz plot parameters of the meson have been performed with the detection of all the final state particles including the neutral decay of 2 . In many experiments, reconstruction of the meson from the neutral decay modes comes with the disadvantage of poor resolution and low efficiency compared to that of the charged particles. In this article, a study of the Dalitz plot parameters keeping the meson as a missing particle is presented. The method is found to be advantageous in the case of poor photon resolution. Effect of the charged particle resolution on the Dalitz variable Y is also examined. This work may provide guidance to select a suitable method for the Dalitz plot analysis, depending on the detector resolution. Received: 27 June 2017, Accepted: 9 October 2017; Edited by: D. Restrepo; DOI: http://dx.doi.org/10.4279/PIP.090009 Cite as: S Ghosh, A Roy, Papers in Physics 9, 090009 (2017) This paper, by S Ghosh, A Roy , is licensed under the Creative Commons Attribution License 3.0 .
{"title":"An improvement to the measurement of Dalitz plot parameters","authors":"S. Ghosh, A. Roy","doi":"10.4279/PIP.090009","DOIUrl":"https://doi.org/10.4279/PIP.090009","url":null,"abstract":"Precise measurement of the Dalitz plot parameters of the decay gives a better insight of the dynamics of the heavy pseudo-scalar meson. Various measurements of the Dalitz plot parameters of the meson have been performed with the detection of all the final state particles including the neutral decay of 2 . In many experiments, reconstruction of the meson from the neutral decay modes comes with the disadvantage of poor resolution and low efficiency compared to that of the charged particles. In this article, a study of the Dalitz plot parameters keeping the meson as a missing particle is presented. The method is found to be advantageous in the case of poor photon resolution. Effect of the charged particle resolution on the Dalitz variable Y is also examined. This work may provide guidance to select a suitable method for the Dalitz plot analysis, depending on the detector resolution. Received: 27 June 2017, Accepted: 9 October 2017; Edited by: D. Restrepo; DOI: http://dx.doi.org/10.4279/PIP.090009 Cite as: S Ghosh, A Roy, Papers in Physics 9, 090009 (2017) This paper, by S Ghosh, A Roy , 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":"2017-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43637110","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}
In this paper we study the characteristics of multifractal spectra obtained for remote sensing images through the coarse theory and proposed a method for segmentation of water bodies based on it. In first place, spectra of self-similar images created with Iterated Function Systems are calculated and compared with their statistical spectra. Then, optical remote sensing images are studied, emphasizing the differences between their spectra and those obtained for synthetic images. Punctually, attention is focused on the concavity of real image spectra and on its interpretation in terms of the analyzed images. This lead us to the proposition of a segmentation method for water bodies. The method is tested and the results are compared with water masks of the regions under study. Comments are made about the limitations of the proposed method. Received: 29 May 2017, Accepted: 20 September 2017; Edited by: C. Muravchik; DOI: http://dx.doi.org/10.4279/PIP.090007 Cite as: V M San Martin, A Figliola, Papers in Physics 9, 090007 (2017) This paper, by V M San Martin, A Figliola , is licensed under the Creative Commons Attribution License 3.0 .
本文研究了利用粗糙理论获得的遥感图像多重分形光谱的特征，提出了一种基于粗糙理论的水体分割方法。首先，计算了迭代函数系统生成的自相似图像的光谱，并与统计光谱进行了比较。然后，对光学遥感图像进行了研究，强调了其光谱与合成图像的差异。重点关注实像光谱的凹凸性及其在分析图像中的解释。这导致我们提出了一种水体分割方法。对该方法进行了测试，并将结果与研究地区的水幕进行了比较。对所提出的方法的局限性进行了评论。收稿日期:2017年5月29日，收稿日期:2017年9月20日;编辑:C. Muravchik;本文作者为V M San Martin, A Figliola, Papers in Physics 9,090007(2017)，使用知识共享署名许可3.0协议。
{"title":"Application of multifractal analysis to segmentation of water bodies in optical satellite images","authors":"V. Martin, A. Figliola","doi":"10.4279/PIP.090007","DOIUrl":"https://doi.org/10.4279/PIP.090007","url":null,"abstract":"In this paper we study the characteristics of multifractal spectra obtained for remote sensing images through the coarse theory and proposed a method for segmentation of water bodies based on it. In first place, spectra of self-similar images created with Iterated Function Systems are calculated and compared with their statistical spectra. Then, optical remote sensing images are studied, emphasizing the differences between their spectra and those obtained for synthetic images. Punctually, attention is focused on the concavity of real image spectra and on its interpretation in terms of the analyzed images. This lead us to the proposition of a segmentation method for water bodies. The method is tested and the results are compared with water masks of the regions under study. Comments are made about the limitations of the proposed method. Received: 29 May 2017, Accepted: 20 September 2017; Edited by: C. Muravchik; DOI: http://dx.doi.org/10.4279/PIP.090007 Cite as: V M San Martin, A Figliola, Papers in Physics 9, 090007 (2017) This paper, by V M San Martin, A Figliola , 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":"2017-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44877651","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}
Leopoldo R. G'omez, N. Garc'ia, R. Register, D. A. Vega
The order-disorder transition of a sphere-forming block copolymer thin film was numerically studied through a Cahn-Hilliard model. Simulations show that the fundamental mechanisms of pattern formation are spinodal decomposition and nucleation and growth. The range of validity of each relaxation process is controlled by the spinodal and order-disorder temperatures. The initial stages of spinodal decomposition are well approximated by a linear analysis of the evolution equation of the system. In the metastable region, the critical size for nucleation diverges upon approaching the order--disorder transition, and reduces to the size of a single domain as the spinodal is approached. Grain boundaries and topological defects inhibit the formation of superheated phases above the order--disorder temperature. The numerical results are in good qualitative agreement with experimental data on sphere-forming diblock copolymer thin films. Received: 22 August 2017, Accepted: 12 December 2017; Edited by: R. Dickman; Reviewed by: A. Peters, Dept. Chemical Engineering, Louisiana Tech Univ., Ruston, USA; DOI: http://dx.doi.org/10.4279/PIP.100001 Cite as: L R Gomez, N A Garcia, R A Register, D A Vega, Papers in Physics 10, 100001 (2018) This paper, by L R Gomez, N A Garcia, R A Register, D A Vega , is licensed under the Creative Commons Attribution License 4.0 .
采用Cahn-Hilliard模型对球状嵌段共聚物薄膜的有序-无序转变进行了数值研究。模拟结果表明，图案形成的基本机制是独立分解和成核生长。每个弛豫过程的有效范围由独立温度和有序-无序温度控制。通过对系统演化方程的线性分析，可以很好地近似于旋量分解的初始阶段。在亚稳区，成核的临界尺寸在接近有序-无序转变时偏离，并在接近旋峰时减小到单个结构域的尺寸。晶界和拓扑缺陷抑制了有序-无序温度以上过热相的形成。数值计算结果与双嵌段共聚物薄膜的实验数据有较好的定性一致性。收稿日期:2017年8月22日，收稿日期:2017年12月12日;编辑:R.迪克曼;审阅人:A. Peters，路易斯安那理工大学化学工程系，美国Ruston;本文作者:L R Gomez, N A Garcia, R A Register, D A Vega, Papers in Physics 10,100001(2018)，采用知识共享署名许可4.0。
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We theoretically study the photoionization of water molecules by high energy photon impact. We develop a model in which the final state wavefunction is given by a Coulomb continuum wavefunction with effective charges and the water molecule bound states are represented using the Moccia's monocentric wavefunctions. We obtain analytical expressions for the transition matrix element that enable the computation of cross sections by numerical quadratures. We compare our predictions for photon energies between 20 and 300 eV with more elaborated theoretical results and experiments. We obtain a very good agreement with experiments, in particular, at enough high energies where there is a lack of elaborated results due to their high computational cost. Received: 15 March 2017, Accepted: 25 June 2017; Edited by: S. Kais; DOI: http://dx.doi.org/10.4279/PIP.090006 Cite as: L Martini, D I R Boll, O A Fojon, Papers in Physics 9, 090006 (2017) This paper, by L Martini, D I R Boll, O A Fojon , is licensed under the Creative Commons Attribution License 3.0 .
我们从理论上研究了高能光子撞击水分子的光离。我们建立了一个模型，其中最终状态波函数由带有效电荷的库仑连续波函数给出，而水分子的束缚状态用Moccia的单中心波函数表示。我们得到了可以用数值正交法计算截面的过渡矩阵元的解析表达式。我们将光子能量在20和300 eV之间的预测与更详细的理论结果和实验结果进行了比较。我们得到了与实验非常一致的结果，特别是在足够高的能量下，由于计算成本高而缺乏详细的结果。收稿日期:2017年3月15日，收稿日期:2017年6月25日;编辑:S. Kais;本文由L Martini, D I R Boll, O A Fojon撰写，采用知识共享署名许可3.0协议进行授权。
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