131,814 research outputs found
Tra diplomazia e teatro: Giuseppe Bonechi nell'epistolario di Metastasio
No full textIl saggio si concentra sulle strategie culturali e diplomatiche messe in atto da Metastasio per proporre il librettista Giuseppe Bonechi alla corte di Giuseppe I re del Portogallo
Vitamin D and cardiovascular diseases
No full textVitamin D is a hormone with pleiotropic effects; it controls calcium homeostasis, immune response, hemodynamic wall stress (by inhibiting Renin Angiotensin Aldosterone System, RAAS, and modulating the endothelial function) and inflammation. In the last decade, numerous studies have focused on the role of vitamin D levels in the setting of cardiovascular disease. In particular, it has been shown that insufficient Vitamin D levels are frequently observed among patients with cardiovascular disease. Hypovitaminosis D activates the renin angiotensin system, causes endothelial dysfunction, reduces cardiomyocyte contractility and is associated with adverse left ventricular remodelling after myocardial infarction. Also, low Vitamin D levels are associated with worse outcome. However, there is still no evidence in supporting an extended use of oral hormone supplementation. Two big epidemiological studies including patients from general practice suggested a U-shape correlation between Vitamin D levels and survival; furthermore, we observed similar results in survivors after myocardial infarction; the prognosis of patients with Vitamin D-i.e., 25-(OH) D-levels 30 ng/mL was markedly worse than the prognosis of patients with levels between 10 and 30 ng/mL. Probably, the new therapeutic strategy should consider the non-linear relationship that exists between Vitamin D levels and the prognosis and should provide careful measurements of the blood levels of this hormone
BELTRAMI PIERDANILO, sub art. 29 (profili societari) in Compliance – Responsabilità da reato degli enti collettivi, a cura di D. Castronuovo – G. De Simone – E. Ginevra – A. Lionzo – D. Negri – G. Varraso, Milano, Wolters Kluwers, 2019, pp. 769-782 e 949-962 (ISBN: 978-88217-70173)
No full textBELTRAMI PIERDANILO, sub art. 42 (profili societari), in Compliance – Responsabilità da reato degli enti collettivi, a cura di D. Castronuovo – G. De Simone – E. Ginevra – A. Lionzo – D. Negri – G. Varraso, Milano, Wolters Kluwers, 2019, pp. 949-962 (ISBN: 978-88217-70173)
No full textLeaf of Leaf Foliation and Beltrami Parametrization in dimensional Gravity
No full textInternational audienceThis work shows the existence of a d>2 dimensional covariant "Beltrami vielbein" that generalizes the d=2 situation. Its definition relies on a sub-foliation Σ^{ADM}_{d-1}=Σ_{d-3}×Σ_2 of the Arnowit--Deser--Misner leaves of d-dimensional Lorentzian manifolds {\cal M}_d. Σ_2 stands for the sub-foliating randomly varying Riemann surfaces in {\cal M}_d. The "Beltrami d -bein" associated to any given generic vielbein of {\cal M}_d is systematically determined by a covariant gauge fixing of the Lorentz~symmetry of the latter. It is parametrized by \frac{d(d+1)}2 independent fields belonging to different categories. Each one has a specific interpretation. The Weyl invariant field sector of the Beltrami d-bein selects the \frac{d(d-3)}{2} physical local degrees of freedom of d>2 dimensional gravity. The components of the Beltrami d-bein are in a one to one correspondence with those of the associated Beltrami d-dimensional metric. The Beltrami parametrization of the Spin connection and of the Einstein action delivers interesting expressions. Its use might easier the search of new Ricci flat solutions classified by the genus of the sub-manifold Σ_2. A gravitational "physical gauge" choice is introduced that takes advantage of the geometrical specificities of the Beltrami parametrization. Further restrictions simplify the expression of the Beltrami vielbein when {\cal M}_d has a given spatial holonomy. This point is exemplified in the case of d=8 Lorentzian spaces with G_2⊂ SO(1,7) holonomy. The Lorentzian results presented in this paper can be extended to the Euclidean case
Marcinkiewicz exponents and jump problem for Beltrami equation
No full text© 2017, Allerton Press, Inc.Marcinkiewicz exponents that were introduced by the author before are applied here to solving boundary-value jump problem on non-rectifiable curve for one special case of the Beltrami equation
Marcinkiewicz exponents and jump problem for Beltrami equation
No full text© 2017, Allerton Press, Inc.Marcinkiewicz exponents that were introduced by the author before are applied here to solving boundary-value jump problem on non-rectifiable curve for one special case of the Beltrami equation
Generalized Helicity and Beltrami Fields
No full textWe propose covariant and non-abelian generalizations of the magnetic helicity and Beltrami equation. The gauge invariance, variational principle, conserved current, energy-momentum tensor and choice of boundary conditions elucidate the subject. In particular, we prove that any extremal of the Yang-Mills action functional 1/4 f(Omega) trF(mu nu) F-mu nu d(4)x subject to the local constraint epsilon(mu nu alpha beta)trF(mu nu)F(alpha beta) = 0 satisfies the covariant non-abelian Beltrami equation
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