323,788 research outputs found
Impeded inverse energy transfer in the Charney--Hasegawa--Mima model of quasi-geostrophic flows
No full textThe behaviour of turbulent flows within the single-layer quasi-geostrophic (Charney-Hasegawa-Mima) model is shown to be strongly dependent on the Rossby deformation wavenumber lambda (or free-surface elasticity). Herein, we derive a bound oil the inverse energy transfer, specifically on the growth rate dl/dt of the characteristic length scale e representing the energy centroid. It is found that dl/dt = l(s) >> lambda(-1)) the inverse energy transfer is strongly impeded, in the sense that under the usual time scale no significant transfer of energy to larger scales occurs. The physical implication is that the elasticity of the free surface impedes turbulent energy transfer in wavenumber space, effectively rendering large-scale vortices long-lived and inactive. Results from numerical simulations of forced-dissipative turbulence confirm this prediction.Peer reviewe
Edmund de Waal at Kettle’s Yard, Mima and elsewhere
No full textThis is the first substantial monograph on my practice. It includes two substantial essays contextualising my recent work as well as a conversation on the place of architecture between me and the architect David Hill
Statistical properties of Charney-Hasegawa-Mima zonal flows
No full textA theoretical interpretation of numerically generated probability density functions (PDFs) of intermittent plasma transport events in unforced zonal flows is provided within the Charney-Hasegawa-Mima (CHM) model. The governing equation is solved numerically with various prescribed density gradients that are designed to produce different configurations of parallel and anti-parallel streams. Long-lasting vortices form whose flow is governed by the zonal streams. It is found that the numerically generated PDFs can be matched with analytical predictions of PDFs based on the instanton method by removing the autocorrelations from the time series. In many instances the statistics generated by the CHM dynamics relaxes to Gaussian distributions for both the electrostatic and vorticity perturbations, whereas in areas with strong nonlinear interactions it is found that the PDFs are exponentially distributed
Percolation transition in the kinematics of nonlinear resonance broadening in Charney–Hasegawa–Mima model of Rossby wave turbulence
No full textWe study the kinematics of nonlinear resonance broadening of interacting Rossby waves as modelled by the Charney-Hasegawa-Mima equation on a biperiodic domain. We focus on the set of wave modes which can interact quasi-resonantly at a particular level of resonance broadening and aim to characterize how the structure of this set changes as the level of resonance broadening is varied. The commonly held view that resonance broadening can be thought of as a thickening of the resonant manifold is misleading. We show that in fact the set of modes corresponding to a single quasi-resonant triad has a non-trivial structure and that its area in fact diverges for a finite degree of broadening. We also study the connectivity of the network of modes which is generated when quasi-resonant triads share common modes. This network has been argued to form the backbone for energy transfer in Rossby wave turbulence. We show that this network undergoes a percolation transition when the level of resonance broadening exceeds a critical value. Below this critical value, the largest connected component of the quasi-resonant network contains a negligible fraction of the total number of modes in the system whereas above this critical value a finite fraction of the total number of modes in the system are contained in the largest connected component. We argue that this percolation transition should correspond to the transition to turbulence in the system
Mima. Film français de Philomène Esposito
No full textVideau André. Mima. Film français de Philomène Esposito. In: Hommes et Migrations, n°1141, mars 1991. Elles... Femmes en mouvement(s) pp. 73-75
Eupithecia mima Mironov 1989
No full textEupithecia mima Mironov, 1989 (Fig. 1) Eupithecia mima Mironov, 1989, Vestnik Zoologii 1989 (3): 14, figs 3 a–d. Holotype ♀ (ZISP, examined), Mongolia: Bayan- Khongor aimak, 140 km S of Shine-Dzhinsta, Ekhin-Gol Oasis. This species from the “ ultimaria ” group has previously been recorded from Uzbekistan, Kazakhstan, Pakistan and Mongolia. It is externally very similar to E. minusculata, but distinguished by the longer aedeagus in the male genitalia and the presence of a short row of spines in the corpus bursae between the base of the ductus seminalis and the colliculum in the female genitalia. The holotype of E. mima was illustrated in Mironov, Galsworthy and Ratzel (2008 a). Male and female genitalia are illustrated in figs. 20 and 27 respectively. Mongolia (aimags): Bayan-Khongor, Govi-Altai.Published as part of Mironov, Vladimir & Galsworthy, Anthony, 2014, A survey of Eupithecia Curtis, 1825 (Lepidoptera, Geometridae, Larentiinae) in Mongolia with descriptions of two new species, pp. 101-130 in Zootaxa 3774 (2) on page 104, DOI: 10.11646/zootaxa.3774.2.1, http://zenodo.org/record/23150
Torotrogla mima Kethley 1970
No full text<i>Torotrogla mima</i> Kethley, 1970 <p> <i>Torotrogla mima</i> Kethley, 1970: 31, figs. 16–17. Types deposited in UGA, not examined.</p> <p> Type host: <i>Mimus polyglottos</i> (Linnaeus) (Passeriformes: Mimidae). Type locality: USA (Georgia).</p> <p> <b>Hosts and distribution.</b> <i>Mimus patagonicus</i> (Lafresnaye & Orbigny) (Mimidae) from South America (unknown locality in Patagonia—area of Argentina and Chile) (Sikora <i>et al</i>. 2011), <i>M. polyglottos</i> (Linnaeus) from USA (Georgia) (Kethley 1970), <i>M. triurus</i> (Vieillot) from Argentina (Sikora <i>et al</i>. 2011).</p>Published as part of <i>Skoracki, Maciej, Spicer, Greg S. & Oconnor, Barry M., 2016, A systematiC review of the subfamily Syringophilinae (ACari: Syringophilidae) of the NearCtiC region. Part 1: quill mites assoCiated with passerines (Aves: Passeriformes), pp. 451-494 in Zootaxa 4084 (4)</i> on page 484, DOI: 10.11646/zootaxa.4084.4.1, <a href="http://zenodo.org/record/1052257">http://zenodo.org/record/1052257</a>
Philornis mima
No full text<i>Philornis mima</i> (Townsend, 1927) <p>Distribution. Brazil.</p> <p>BRAZIL, São Paulo, Paranapiacaba, Alto da Serra, -23.7800, -46.3200 (Townsend 1927).</p>Published as part of <i>LÖWENBERG-NETO, PETER & DE CARVALHO, CLAUDIO J. B., 2013, Muscidae (Insecta: Diptera) of Latin America and the Caribbean: geographic distribution and check-list by country, pp. 1-147 in Zootaxa 3650 (1)</i> on page 32, DOI: 10.11646/zootaxa.3650.1.1, <a href="http://zenodo.org/record/5264631">http://zenodo.org/record/5264631</a>
Multidisciplinary applications of muon radiography using the MIMA detector
No full textThe MIMA muon tracker, developed by the INFN Unit of Florence and the Department of Physics and Astronomy of the University of Florence, has been designed to test the application of muon radiography (or muography) to multidisciplinary case studies, to demonstrate its validity as an imaging tool in different fields and to develop dedicated data analysis strategies. The MIMA detector is a scaled-down version of the muon trackers developed for the "Mu-Ray" INFN R&D project and the MURAVES (MUon RAdiography of VESuvius) "Progetto Premiale", financed by the Italian government. Thanks to its compactness, MIMA allowed the use of slightly different technical solutions with respect to the other detectors. Its construction was completed in the first half of 2017 and since then it has been used for several different measurements. In the second half of 2017 the detector was installed in the Bourbon Gallery inside Mount Echia, a hill in the center of Naples containing a complicated system of tunnels and cavities that have been dug over many centuries. The installation of the MIMA tracker was required to validate with an independent detector the results obtained in two previous measurements by the Mu-Ray tracker. After this measurement, the detector has been used in the Tuscany region, mainly for investigating two possible fields of application: geo-hydrological risk assessment and mining activity. The preliminary results of these tests and the future perspectives are shortly presented in this paper
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