排序方式: 共有34条查询结果,搜索用时 0 毫秒
31.
Paolo Falsaperla Andrea Giacobbe Sebastiano Lombardo Giuseppe Mulone 《Ricerche di matematica》2017,66(1):125-140
Laminar flows of conducting fluids with an imposed magnetic field play an important role in many applications, for instance in geophysics, astrophysics, e.g. when dealing with solar winds, industry, biology, in metallurgy, in biofilms, etc. Also many engineering applications require heating at the boundaries. The inclination has been examined by some authors mainly in theoretical applications, geophysical studies, and materials processing. In Falsaperla et al. (Laminar hydromagnetic flows in an inclined heated layer, 2016) we have investigated analytical solutions of stationary laminar flows of an inclined layer filled with a hydromagnetic fluid heated from below and subject to the gravity field. In this article we study linear instability and nonlinear stability of some of the above solutions and investigate the critical stability/instability thresholds. 相似文献
32.
In this article, we address the question of relating the stability properties of an operator with the stability properties of its associate symmetric operator. The linear-algebra results of Bendixson and Hirsch indicate that the symmetric part of a matrix is always less stable than the matrix itself. We show that in a variety of cases, including infinite dimensional cases associated to systems of PDEs, the same result is valid. We also discuss the applicability to non-autonomous systems, and we show that, in general, this result is not valid. We also review some of the literature that in these years has appeared on the subject. 相似文献
33.
Lodi Rizzini E Bianconi A Bussa MP Corradini M Donzella A Venturelli L Bargiotti M Bertin A Bruschi M Capponi M De Castro S Fabbri L Faccioli P Galli D Giacobbe B Marconi U Massa I Piccinini M Poli M Semprini Cesari N Spighi R Vagnoni V Vecchi S Villa M Vitale A Zoccoli A Gorchakov OE Pontecorvo GB Rozhdestvensky AM Tretyak VI Guaraldo C Petrascu C Balestra F Busso L Denisov OY Ferrero L Garfagnini R Grasso A Maggiora A Piragino G Tosello F Zosi G Margagliotti G Santi L Tessaro S 《Physical review letters》2002,89(18):183201
We report the stopping power of molecular hydrogen for antiprotons of kinetic energy above the maximum (approximately 100 keV) with the purpose of comparing with the proton one. Our result is consistent with a positive difference in antiproton-proton stopping powers above approximately 250 keV and with a maximum difference between the stopping powers of 21%+/-3% at around 600 keV. 相似文献
34.
Cushman RH Dullin HR Giacobbe A Holm DD Joyeux M Lynch P Sadovskií DA Zhilinskií BI 《Physical review letters》2004,93(2):024302
We consider the wide class of systems modeled by an integrable approximation to the 3 degrees of freedom elastic pendulum with 1:1:2 resonance, or the swing-spring. This approximation has monodromy which prohibits the existence of global action-angle variables and complicates the dynamics. We study the quantum swing-spring formed by bending and symmetric stretching vibrations of the CO2 molecule. We uncover quantum monodromy of CO2 as a nontrivial codimension 2 defect of the three dimensional energy-momentum lattice of its quantum states. 相似文献