Il Nuovo cimento della Societa italiana di fisica. C最新文献

{"title":"A micromechanically motivated model for the viscoelastic behaviour of soft biological tissues at large strains","authors":"A. E. Ehret, M. Itskov, Georg W. Weinhold","doi":"10.1393/NCC/I2009-10334-7","DOIUrl":"https://doi.org/10.1393/NCC/I2009-10334-7","url":null,"abstract":"In this contribution, a non-linear viscoelastic anisotropic model for soft biological tissues is presented. The viscoelastic behaviour of these materials is explained by micromechanical considerations regarding the interplay between collagen fibres and the surrounding ground substance. The model is based on a multiplicative decomposition of the fibre stretch into a part relating to the straightening of the crimped fibres and a part describing the stretch in the fibre itself. The actual structural state of the fibres is reflected by internal variables. Including a non-uniform distribution of these fibres, the anisotropic three-dimensional constitutive equations are obtained by integration over the unit sphere. The model holds for large strain problems and is illustrated by application to arterial tissue.","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580452","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}

{"title":"Three-dimensional turbulence vorticity: Numerical and experimental modeling","authors":"D. Cano, J. Cano, A. Matulka","doi":"10.1393/NCC/I2009-10361-4","DOIUrl":"https://doi.org/10.1393/NCC/I2009-10361-4","url":null,"abstract":"We show in this paper how a system of equations of motion, diffusion and continuity that present the effects of vorticity through a vorticity transfer length scale may be used to model 2D-3D vorticity behaviour. The local turbulent vorticity is separated from the large-scale flow following the Reynolds decomposition (Reynolds 1894, Taylor 1931)—∇ × v + ∇ × v —similar to the technique used for velocity. The system of equations extended through the terms ∇ × v and ∇ × v is solved numerically using a purely statistical local method that details the role of vorticity transport in the turbulence behaviour of the flow. Moreover, this numerical model that shows the temporal evolution of both fields, 3D velocity and 3D vorticity is used to investigate the propagation of turbulent perturbations that arise from the development of a vortex placed in the centre of the numerical domain. Even with a small mesh (60 × 60 × 120), the results show the propagation of vorticity-related waves both in the plane and in the vertical. The numerical results are compared with experiments performed in a stratified flow, where velocity and vorticity are measured with PIV as turbulence behind a grid decay, these experiments have been performed both in a rotating frame of reference and with no rotation and show features also detected in the numerical simulations when the assumption of a quasi– two-dimensional flow is used.","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580543","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}

{"title":"Thorpe method applied to planetary boundary layer data","authors":"P. Gonzalez-Nieto, J. Cano, D. Cano, M. Tijera","doi":"10.1393/NCC/I2009-10338-3","DOIUrl":"https://doi.org/10.1393/NCC/I2009-10338-3","url":null,"abstract":"","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580465","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}

{"title":"Forcing and mixing processes in the Amazon estuary: A study case","authors":"M. Bezerra, R. Pontes, M. N. Gallo, A. M. C. Carmo, S. Vinzón, R. P. Rosário","doi":"10.1393/NCC/I2009-10346-3","DOIUrl":"https://doi.org/10.1393/NCC/I2009-10346-3","url":null,"abstract":"The research area of this paper is located at the estuary of the Amazon River (Brazil), more precisely at the river mouth (parallels 00° 30'N and 1° 30'N and meridians 049° 00' \u0000W and 050° 00'W). This paper presents the results of air movement analysis on the surface atmospheric circulation over the Mouth of the Amazonas River, salinity and temperature measures as well as measurements of currents, carried out along a longitudinal section in the navigation canal region of the Northern Bar of the Amazon River (Barra Norte do Rio Amazonas) in June 2006, during the river flood season in the quadrature tide. This paper purports to contribute towards better interpreting the dynamics effect in hydrodynamic, meteorological and hydrographical parameters at the river mouth. The conclusion drawn from an examination of the issues and related research is that: a) the saline wedge-type stratification can be seen approximately 100km away from the mouth of the Amazon River during the end of the rainy season in the quadrature tide; b) probably, at Amazon estuary quadrature entrainment processes are predominant and are the ones responsible for increased salinity in surface layer, whereas turbulence \u0000scattering mixing is secondary to it. c) The large flow of fresh water from the Amazon River at the end of the rainy season implies the displacement of the front saline position over the internal Amazon continental platform. d) The tidal wave shows a positive asymmetry in the canal, with floods lasting less than the ebb tide. This asymmetry decreases towards the ocean, eventually becoming reversed in the presence of a saline wedge. The speeds, however, have a negative asymmetry, with more intense ebb tides, due to the river flow and is more evident by the existence of \u0000quadrature tides. e) The progressive behavior of the tidal wave in its propagation in the Northern Channel as well as the effect of morphology on the discharge were observed, with the canal configuration causing the first four anchoring points of the tide to propagate in a straight direction. f) The average climatology of the wind shearing vector shows that it is predominantly zonal over the Atlantic. g) The shearing intensification near the coastal area is according to the zonal wind intensification pattern. The Amazon estuary has unusual characteristics in relation to many established paradigms of estuarine physics; therefore, many more detailed studies are necessary to understand this system’s turbulent processes.","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580527","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}

{"title":"A re-evaluation of surface layer turbulence from Antarctic data","authors":"F. Tampieri, A. Maurizi","doi":"10.1393/NCC/I2008-10329-X","DOIUrl":"https://doi.org/10.1393/NCC/I2008-10329-X","url":null,"abstract":"A data set of velocity and temperature variances measured in the surface layer over a glacier in Antarctica is analysed in terms of the Monin-Obukhov Similarity Theory. The presence of surface inhomogeneities, flow unsteadyness, and other uncontrolled disturbances affects the shape of the distribution of normalised variances for intervals of the stability parameter. The modal value of the distribution, instead of the mean, is used to estimate the numerical coefficients of the similarity functions to minimize the influence of the (positive) outliers on the estimates. The overall agreement of the present results with previuos investigations is good, and also the spread of the numerical values noted by different authors is confirmed. In particular the investigation points out the need to use a similarity function for the temperature variance which diverges in near neutral conditions, as the heat flux goes to zero, and the occurrence of a large stability region where the variances of velocity and temperature are characterised by behaviour almost independent of the momentum flux. PACS 47.27.nb Boundary layer turbulence PACS 92.60.Fm Boundary layer structure and processes PACS 92.60.hk Convection, turbulence, and diffusion","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580696","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}

{"title":"Neutron Tomography at INES: First experimental results","authors":"G. Salvato, F. Aliotta, L. Bartoli, F. Grazzi, R. Ponterio, D. Tresoldi, C. Vasi, M. Zoppi","doi":"10.1393/NCC/I2008-10309-2","DOIUrl":"https://doi.org/10.1393/NCC/I2008-10309-2","url":null,"abstract":"","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580174","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}

{"title":"The TOF detector of ALICE experiment: Analysis of the first cosmic data","authors":"P. Pagano","doi":"10.1393/NCC/I2009-10319-6","DOIUrl":"https://doi.org/10.1393/NCC/I2009-10319-6","url":null,"abstract":"— ALICE@LHC is an experiment optimized for study of heavy-ions collisions (Pb-Pb up to 5.5 ATeV). The main aim is the search for a new state of matter (called QGP) where quarks and gluons are deconfined. Particle identification is guaranteed by a set of detectors: one of these, the time-of-flight system plays an important role in the identification of charged hadrons (π, K, p) in the momentum range [0.5, 4] GeV/c. The first data-taking periods with cosmic rays have been a great chance to check the performance of the experimental apparatus and of the developed software for description, simulation, recostruction, visualization and analysis. A preliminary time resolution study on this cosmic rays data is presented.","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580386","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}

{"title":"Frictional dissipation at the interface of a two-layer quasi-geostrophic flow","authors":"F. Crisciani, R. Purini, M. Severini","doi":"10.1393/NCC/I2008-10299-Y","DOIUrl":"https://doi.org/10.1393/NCC/I2008-10299-Y","url":null,"abstract":"","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580114","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}

{"title":"Water mass census in the Nordic seas using climatological and observational data sets","authors":"S. Piacsek, B. Allard, J. Mcclean","doi":"10.1393/NCC/I2008-10290-8","DOIUrl":"https://doi.org/10.1393/NCC/I2008-10290-8","url":null,"abstract":"An apparatus for applying a stem pick to a flower stem wherein the stem pick has laterally directed fingers for wrapping around the stem of a flower. The apparatus includes means for positioning a stem pick into a position ready for attachment to the flower stem, means for attaching the stem pick to the stem of a flower, and pressure adjusting means for adjusting the pressure of the stem pick fingers. The pressure adjusting means comprises a clutch mechanism having means for adjusting the torque applied to the means for attaching the stem pick to the stem of a flower.","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580029","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}

{"title":"The geology of Mount Taftan stratovolcano, southeast of Iran","authors":"H. Biabangard, A. Moradian","doi":"10.1393/NCC/I2008-10295-3","DOIUrl":"https://doi.org/10.1393/NCC/I2008-10295-3","url":null,"abstract":"","PeriodicalId":81495,"journal":{"name":"Il Nuovo cimento della Societa italiana di fisica. C","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66580105","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}