发布求助
文献互助 智能选刊 最新文献

Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali最新文献

筛选
英文 中文
Propagating density fluctuations in hydrodynamics and beyond 在流体力学及其他领域传播密度波动
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-10-01 DOI: 10.1478/AAPP.98S1A2
S. Cazzato, M. G. Izzo, T. Bryk, T. Scopigno, G. Ruocco
{"title":"Propagating density fluctuations in hydrodynamics and beyond","authors":"S. Cazzato, M. G. Izzo, T. Bryk, T. Scopigno, G. Ruocco","doi":"10.1478/AAPP.98S1A2","DOIUrl":"https://doi.org/10.1478/AAPP.98S1A2","url":null,"abstract":"Density fluctuations in simple liquids are analysed in the context of three different and widely used formalisms, whose equivalence in the hydrodynamic limit is shown. We, furthermore, address the issue of the dispersion of the propagating modes outside the hydrodynamics, by comparing three different definitions of the generalized sound velocity. The first definition is standard in statistical mechanics. It relates the sound velocity to the imaginary part of the complex conjugate poles of the so-called intermediate scattering function. Other definitions, frequently used in the literature, identify the characteristic frequencies of the inelastic excitations with the maxima of the inelastic features of the dynamic structure factor, or with the maxima of the current function. The behaviour of these three quantities in the hydrodynamic limit is discussed. Deviations from hydrodynamic dispersion law are also considered with particular emphasis given to the analysis of different sound propagation regimes related to different density fluctuations decay channels.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44965556","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: 0
On the Debye-like behaviour of the specific heat of permanently densified silica glass 永久致密二氧化硅玻璃比热的德拜行为
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-10-01 DOI: 10.1478/AAPP.98S1A3
G. Baldi, A. Fontana, F. Rossi
{"title":"On the Debye-like behaviour of the specific heat of permanently densified silica glass","authors":"G. Baldi, A. Fontana, F. Rossi","doi":"10.1478/AAPP.98S1A3","DOIUrl":"https://doi.org/10.1478/AAPP.98S1A3","url":null,"abstract":"The aim of this work is to review the main results about the vibrational dynamics of glasses and to clarify the effect induced by changes of the mass density on their thermal properties. In particular, we present the temperature dependence of the specific heat of permanently densified silica glass in comparison to that of crystalline alpha-quartz. We propose a very simple and schematic model to interpret the experimental results.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47770738","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: 0
Rising the molecular mobility of polyvinyl butyral by plasticizers: towards energy storage applications 增塑剂提高聚乙烯醇缩丁醛的分子迁移率：储能应用
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-10-01 DOI: 10.1478/AAPP.98S1A6
A. Bartolotta, G. Marco, M. Federico, G. Carini
{"title":"Rising the molecular mobility of polyvinyl butyral by plasticizers: towards energy storage applications","authors":"A. Bartolotta, G. Marco, M. Federico, G. Carini","doi":"10.1478/AAPP.98S1A6","DOIUrl":"https://doi.org/10.1478/AAPP.98S1A6","url":null,"abstract":"The versatile behaviour of poly-vinylbutyral (PVB) and its ability to form quasi-solid polymer electrolytes (SPE) with reliable ionic mobility, has been investigated over the temperature range from 120 K to 350 K, by mechanical and dielectric spectroscopic measurements. Enhancements in the polymer chain flexibility, due to the addition of low molar mass organic liquid plasticizers (acetonitrile, AcN, and methoxy-propionitrile, MPN) favouring the long-range motion of charge carriers, give rise to a room temperature ionic conductivity which in the hybrid PVB/MPN/LiI system increases of about 3 and 9 orders of magnitude with respect to the counterparts PVB/LiI and pure dry-PVB system, respectively. This result proves the existence of coupling between cooperative segmental motion and ion dynamics in such kind of materials.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49368392","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: 0
Introducing “Glasses and Polymers: The Science of Disorder” 介绍“玻璃与聚合物：无序科学”
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-10-01 DOI: 10.1478/AAPP.98S1E1
G. D’Angelo, U. Wanderlingh, C. Branca
{"title":"Introducing “Glasses and Polymers: The Science of Disorder”","authors":"G. D’Angelo, U. Wanderlingh, C. Branca","doi":"10.1478/AAPP.98S1E1","DOIUrl":"https://doi.org/10.1478/AAPP.98S1E1","url":null,"abstract":"Preface to the AAPP special issue gathering the proceedings of the international workshop on Glasses and Polymers: the Science of Disorder , held in Messina, Italy, on 15-16 November 2018.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48686816","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: 0
Raman and Brillouin scattering of spherical nanoparticles and their clusters 球形纳米粒子及其团簇的拉曼散射和布里渊散射
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-10-01 DOI: 10.1478/AAPP.98S1A5
M. Secchi, M. Montagna
{"title":"Raman and Brillouin scattering of spherical nanoparticles and their clusters","authors":"M. Secchi, M. Montagna","doi":"10.1478/AAPP.98S1A5","DOIUrl":"https://doi.org/10.1478/AAPP.98S1A5","url":null,"abstract":"The inelastic light scattering of the acoustic vibration of spherical nanoparticles is reviewed. For particles much smaller than the wavelength of the exciting light (λ), with a diameter ( d ) smaller than about 20 nm, the dominant physical mechanism, called Raman, is the polarizability fluctuation due to dipole dipole or bond polarizability induced effects. Only spheroidal modes with l = 0 and l = 2 are Raman active. For particles of size comparable with λ ( d larger than about 100 nm) a different physical mechanism is dominant, the mass displacement and relative polarization associated with the vibration, as for the usual Brillouin scattering of liquid and solids. As the size increases, higher and higher l modes with higher and higher n, the index that labels the radial wavevector, become important and many dozen of peaks appear for d > 500 nm. A simple model allows to reproduce the main features of the observed spectra. A more precise agreement is obtained by a refinement that considers the interaction among the particles in a phononic crystals. The interaction produces broadening and shift of the lines and accounts for the presence of a very low frequency broad band, attributed to the density of states of the modes of the sound propagation in the crystal. The analysis of the spectra allows to obtain information on the dynamics of the single free sphere and on the strength of the interaction. By measuring the temperature-dependence of the Brillouin spectra in clusters of polystyrene nanoparticles during the sintering process, it is possible to identify the glass- transition temperature and calculate the elastic modulus of individual nanoparticles as a function of particle size and chemistry. Surface mobility is evidenced by a size dependence of the interaction among the particles and of the glass transition temperature.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47324926","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
On the fragility of complex material systems 关于复杂材料系统的脆弱性
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-05-18 DOI: 10.1478/AAPP.981A4
M. T. Caccamo, S. Magazù, L. Restuccia
{"title":"On the fragility of complex material systems","authors":"M. T. Caccamo, S. Magazù, L. Restuccia","doi":"10.1478/AAPP.981A4","DOIUrl":"https://doi.org/10.1478/AAPP.981A4","url":null,"abstract":"In this work we investigate, from both a macroscopic and a microscopic point of view, the fragility degree of complex material systems. In particular, we integrate a microscopic and a macroscopic approach. The former is formulated in the framework of non-equilibrium thermodynamics in order to obtain the phenomenological equations for the heat flux and viscous pressure tensor, as functions of the absolute temperature T and of the small strain tensor, in the isotropic case, where the shear viscosity is supposed to depend on T g /T . The latter is connected with a macroscopic definition of fragility, operatively introduced by Angell for glass-forming systems, and with the definition of thermal restraint, based on elastic incoherent neutron scattering data. On that score literature data of viscosity, as a function of concentration and temperature, and literature data of elastic intensity data are correlated with the system fragility and with the system thermal restraint. The obtained results are of interest for a wide range of innovative materials, such as, for example, carbon nanotubes and bioprotectant systems.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44004674","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: 0
Computer virus propagation modelled as a stochastic differential game 计算机病毒传播建模为随机微分对策
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-05-07 DOI: 10.1478/AAPP.981A3
M. Lefebvre
{"title":"Computer virus propagation modelled as a stochastic differential game","authors":"M. Lefebvre","doi":"10.1478/AAPP.981A3","DOIUrl":"https://doi.org/10.1478/AAPP.981A3","url":null,"abstract":"The propagation of a computer virus is expressed as a stochastic differential game based on the two-dimensional Kermack-McKendrick model for the spread of epidemics. One optimizer tries to maximize the expected value of a cost function with quadratic control costs, while the other one wants to minimize this expected value. A particular problem is solved explicitly by making use of the method of similarity solutions to obtain the solution to the partial differential equation satisfied by the value function, subject to the appropriate conditions.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43350059","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
The Curculioninae (Coleoptera: Curculionidae) of Sicily: recent records and updated catalogue 西西里岛的龟甲亚科（鞘翅目：龟甲科）：最新记录和最新目录
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-05-04 DOI: 10.1478/AAPP.981A1
C. Baviera, R. Caldara
{"title":"The Curculioninae (Coleoptera: Curculionidae) of Sicily: recent records and updated catalogue","authors":"C. Baviera, R. Caldara","doi":"10.1478/AAPP.981A1","DOIUrl":"https://doi.org/10.1478/AAPP.981A1","url":null,"abstract":"An updated catalogue of the Sicilian species of the weevil subfamily Curculioninae is proposed on the basis of revised bibliographical data and new Sicilian material collected by the authors and other entomologists in the last decades. A total of 167 species is reported with certainty from the main island and surrounding isles, five of them new for Sicily: Anthonomus conspersus (Desbrochers des Loges, 1868), Bradybatus fallax Gerstaecker, 1860, Dorytomus rubrirostris (Gravenhorst, 1807), Gymnetron stimulosum (Germar, 1821) and Tychius longicollis C.N.F. Brisout de Barneville, 1863. Detailed data for Anthonomus incurvus (Panzer, 1795), A. ulmi (DeGeer, 1775), Bradybatus elongatulus (Boheman, 1843), Curculio propinquus (Desbrochers des Loges, 1868), Archarius troglodytes (Jekel, 1861), Derelomus subcostatus Boheman, 1844, Pachytychius discithorax Desbrochers des Loges, 1873, and Sibinia arenariae Stephens, 1831 are quoted for the first time, being these species previously reported generically from Sicily. The presence of 14 taxa formerly indicated from Sicily is considered as doubtful, whereas for other 16 taxa it is excluded.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41316218","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
Stability and Hopf bifurcation analysis of a distributed time delay energy model for sustainable economic growth 可持续经济增长的分布式时滞能量模型的稳定性和Hopf分岔分析
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-05-04 DOI: 10.1478/AAPP.981A2
M. Ferrara, M. Gangemi, L. Guerrini, B. Pansera
{"title":"Stability and Hopf bifurcation analysis of a distributed time delay energy model for sustainable economic growth","authors":"M. Ferrara, M. Gangemi, L. Guerrini, B. Pansera","doi":"10.1478/AAPP.981A2","DOIUrl":"https://doi.org/10.1478/AAPP.981A2","url":null,"abstract":"This paper examines the consequences of including distributed delays in an energy model. The stability behaviour of the resulting equilibrium for our dynamic system is analysed, including models with Dirac, weak and strong kernels. Applying the Hopf bifurcation theorem we determine conditions under which limit cycle motion is born in such models. The results indicate that distributed delays have an ambivalent impact on the dynamical behaviour of systems, either stabilizing or destabilizing them.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48821182","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: 4
SET-VALUED ORTHOGONALITY AND NEARNESS 集值正交性和逼近性
IF 0.4
Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali Pub Date : 2020-02-02 DOI: 10.1478/AAPP.98S2A2
A. Barbagallo, Octavian-Emil Ernst, Michel Théra
{"title":"SET-VALUED ORTHOGONALITY AND NEARNESS","authors":"A. Barbagallo, Octavian-Emil Ernst, Michel Théra","doi":"10.1478/AAPP.98S2A2","DOIUrl":"https://doi.org/10.1478/AAPP.98S2A2","url":null,"abstract":"The theory of set-valued mappings has grown with the development of modern variational analysis. It is a key in convex and non-smooth analysis, in game theory, in mathematical economics and in control theory. The concepts of nearness and orthogonality have been known for functions since the pioneering works of Campanato, Birkhoff and James. In a recent paper Barbagallo et al. [J. Math. Anal. Appl., 484 (1), (2020)] a connection between these two concepts has been made. This note is mainly devoted to introduce nearness and orthogonality between set-valued mappings with the goal to study the solvability of generalized equations involving set-valued mappings.","PeriodicalId":43431,"journal":{"name":"Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2020-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46578199","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: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信