Papers in Physics最新文献_第9页

A neuronal device for the control of multi-step computations 用于控制多步计算的神经元装置

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Papers in Physics Pub Date : 2013-08-13 DOI: 10.4279/PIP.050006

Ariel Zylberberg, Luciano Paz, P. Roelfsema, S. Dehaene, M. Sigman

引用次数: 13

Granular discharge rate for submerged hoppers 浸没式料斗的颗粒排出率

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Papers in Physics Pub Date : 2013-07-10 DOI: 10.4279/pip.060009

T. Wilson, Charlotte R. Pfeifer, N. Mesyngier, D. Durian

引用次数: 34

Revisiting the two-mass model of the vocal folds 重新审视声带的双肿块模型

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Papers in Physics Pub Date : 2013-06-25 DOI: 10.4279/PIP.050004

M. F. Assaneo, M. Trevisan

引用次数: 4

Enhancement of photoacoustic detection of inhomogeneities in polymers 增强聚合物不均匀性的光声检测

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Papers in Physics Pub Date : 2013-05-07 DOI: 10.4279/PIP.050005

P. Grondona, H. O. Rocco, D. Iriarte, J. Pomarico, H. Ranea-Sandoval, G. Bilmes

引用次数: 0

A mathematically assisted reconstruction of the initial focus of the yellow fever outbreak in Buenos Aires (1871) 1871年布宜诺斯艾利斯黄热病爆发的最初焦点的数学辅助重建

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Papers in Physics Pub Date : 2013-03-25 DOI: 10.4279/PIP.050002

María Laura Fernández, M. Otero, N. Schweigmann, H. Solari

{"title":"A mathematically assisted reconstruction of the initial focus of the yellow fever outbreak in Buenos Aires (1871)","authors":"María Laura Fernández, M. Otero, N. Schweigmann, H. Solari","doi":"10.4279/PIP.050002","DOIUrl":"https://doi.org/10.4279/PIP.050002","url":null,"abstract":"We discuss the histo ric mortality record corresponding to the initial focus of the yellow fever epidemic outbreak registered in Buenos Aires during the year 1871 as compared to simulations of a stochastic population dynamics model. This model incorporates the biology of the urban vector of yellow fever, the mosquito Aedes aegypti , the stages of the disease in the human being as well as the spatial extension of the epidemic outbreak. After introducing the historical context and the restrictions it puts on initial conditions and ecological parameters, we discuss the general features of the simulation and the dependence on initial conditions and available sites for breeding the vector. We discuss the sensitivity, to the free parameters, of statistical estimators such as: final death toll, day of the year when the outbreak reached half the total mortality and the normalized daily mortality, showing some striking regularities. The model is precise and accurate enough to discuss the truthfulness of the presently accepted historic discussions of the epidemic causes, showing that there are more likely scenarios for the historic facts. Received: 9 October 2012, Accepted: 1 March 2013; Edited by: G. Mindlin; DOI: http://dx.doi.org/10.4279/PIP.050002 Cite as: M L Fernandez, M Otero, N Schweigmann, H G Solari , Papers in Physics 5, 050002 (2013)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2013-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009799","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: 5

A criterion to identify the equilibration time in lipid bilayer simulations 在脂质双分子层模拟中确定平衡时间的标准

IF 0.9

Papers in Physics Pub Date : 2012-10-11 DOI: 10.4279/PIP.040005

R. D. Porasso, J. Cascales

{"title":"A criterion to identify the equilibration time in lipid bilayer simulations","authors":"R. D. Porasso, J. Cascales","doi":"10.4279/PIP.040005","DOIUrl":"https://doi.org/10.4279/PIP.040005","url":null,"abstract":"With the aim of establishing a criterion for identifying when a lipid bilayer has reached steady state using the molecular dynamics simulation technique, lipid bilayers of different composition in their liquid crystalline phase were simulated in aqueous solution in presence of CaCl as electrolyte, at different concentration levels. In this regard, we used two different lipid bilayer systems: one composed by 288 DPPC (DiPalmitoylPhosphatidylCholine) and another constituted by 288 DPPS (DiPalmitoylPhosphatidylSerine). In this sense, for both type of lipid bilayers, we have studied the temporal evolution of some lipids properties, such as the surface area per lipid, the deuterium order parameter, the lipid hydration and the lipid-calcium coordination. From their analysis, it became evident how each property has a different time to achieve equilibrium. The following order was found, from faster property to slower property: coordination of ions deuterium order parameter area per lipid hydration. Consequently, when the hydration of lipids or the mean area per lipid are stable we can ensure that the lipid membrane has reached the steady state. Received: 3 September 2012, Accepted: 24 October 2012; Edited by: M. C. Barbosa; DOI: http://dx.doi.org/10.4279/PIP.040005 Cite as: R. D. Porasso, J. J. Lopez Cascales, Papers in Physics 4, 040005 (2012)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2012-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009427","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: 23

Natural and laser-induced cavitation in corn stems: On the mechanisms of acoustic emissions 玉米茎中自然空化和激光诱导空化:声发射机制研究

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Papers in Physics Pub Date : 2012-05-15 DOI: 10.4279/PIP.040003

E. Fern'andez, Roberto Fernández, G. Bilmes

{"title":"Natural and laser-induced cavitation in corn stems: On the mechanisms of acoustic emissions","authors":"E. Fern'andez, Roberto Fernández, G. Bilmes","doi":"10.4279/PIP.040003","DOIUrl":"https://doi.org/10.4279/PIP.040003","url":null,"abstract":"Water in plant xylem is often superheated, and therefore in a meta-stable state. Under certain conditions, it may suddenly turn from the liquid to the vapor state. This cavitation process produces acoustic emissions. We report the measurement of ultrasonic acoustic emissions (UAE) produced by natural and induced cavitation in corn stems. We induced cavitation and UAE in vivo , in well controlled and reproducible experiments, by irradiating the bare stem of the plants with a continuous-wave laser beam. By tracing the source of UAE, we were able to detect absorption and frequency filtering of the UAE propagating through the stem. This technique allows the unique possibility of studying localized embolism of plant conduits, and thus to test hypotheses on the hydraulic architecture of plants. Based on our results, we postulate that the source of UAE is a transient \"cavity oscillation\"' triggered by the disruptive effect of cavitation inception. Received: 14 March 2011, Accepted: 23 April 2012; Edited by: V. Lakshminarayanan; Reviewed by: C. Negreira, Laboratorio de Acustica Ultrasonora, Universidad de la Republica, Uruguay; DOI: http://dx.doi.org/10.4279/PIP.040003 Cite as: E. Fernandez, R. J. Fernandez, G. M. Bilmes, Papers in Physics 4, 040003 (2012)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2012-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009384","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

Beltrami flow structure in a diffuser. Quasi-cylindrical approximation 扩散器中的贝尔特拉米流结构。Quasi-cylindrical近似

IF 0.9

Papers in Physics Pub Date : 2012-03-07 DOI: 10.4279/PIP.040002

R. Gonz'alez, R. Page, A. Sartarelli

{"title":"Beltrami flow structure in a diffuser. Quasi-cylindrical approximation","authors":"R. Gonz'alez, R. Page, A. Sartarelli","doi":"10.4279/PIP.040002","DOIUrl":"https://doi.org/10.4279/PIP.040002","url":null,"abstract":"We determine the flow structure in an axisymmetric diffuser or expansion region connecting two cylindrical pipes when the inlet flow is a solid body rotation with a uniform axial flow of speeds and U, respectively. A quasi-cylindrical approximation is made in order to solve the steady Euler equation, mainly the Bragg-Hawthorne equation. As in our previous work on the cylindrical region downstream [R Gonzalez et al., Phys. Fluids 20, 24106 (2008); R. Gonzalez et al., Phys. Fluids 22, 74102 (2010), R Gonzalez et al., J. Phys.: Conf. Ser. 296, 012024 (2011)], the steady flow in the transition region shows a Beltrami flow structure. The Beltrami flow is defined as a field that satisfies , with . We say that the flow has a Beltrami flow structure when it can be put in the form , being U and constants, i.e it is the superposition of a solid body rotation and translation with a Beltrami one. Therefore, those findings about flow stability hold. The quasi-cylindrical solutions do not branch off and the results do not depend on the chosen transition profile in view of the boundary conditions considered. By comparing this with our earliest work, we relate the critical Rossby number (stagnation) to the corresponding one at the fold [J. D. Buntine et al., Proc. R. Soc. Lond. A 449, 139 (1995)]. Received: 29 August 2011,, Accepted: 29 February 2012; Edited by: J-P. Hulin; DOI: http://dx.doi.org/10.4279/PIP.040002 Cite as: R Gonzalez, R Page, A S Sartarelli , Papers in Physics 4, 040002 (2012)","PeriodicalId":19791,"journal":{"name":"Papers in Physics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2012-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71009319","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

High-speed tunable photonic crystal fiber-based femtosecond soliton source without dispersion pre-compensation 无色散预补偿的高速可调谐光子晶体光纤飞秒孤子源

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Papers in Physics Pub Date : 2012-02-13 DOI: 10.4279/PIP.040001

Martín Caldarola, Victor A. Bettachini, A. Rieznik, Pablo G. Konig, M. E. Masip, D. Grosz, A. Bragas

引用次数: 1

Commentary on "Anisotropic finite-size scaling of an elastic string at the depinning threshold in a random-periodic medium" 对“随机周期介质中弹性弦在脱孔阈值处的各向异性有限尺寸尺度”的评注

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Papers in Physics Pub Date : 2011-12-01 DOI: 10.4279/PIP.020009

A. A. Fedorenko

引用次数: 0