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1.
Giovanni Cerioni Costantino Floris Giaime Marongiu Gabriele Navarra Francesca Sotgiu 《Journal of heterocyclic chemistry》1994,31(5):1151-1155
1-5-benzoxathiepine compounds are a novel class of heterocyclic rings that present interesting properties as central nervous system depressants. With the aim to contribute to the elucidation of the structure-activity relationship of this class of compounds we report a structural study of the 3-hydroxy-1,5-benzoxathiepine both in solution and in the solid state. Studies by dynamic 13C-nmr in solution show that three conformations are possible for the oxathiepin ring. A unique chair conformation characterizes the atoms in the oxathiepine ring of the crystallized molecule. The crystal structure was solved by direct methods. Values of bond distances and angles are within the expected range. 相似文献
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It is shown that the correlation between charged-particle multiplicities and pseudo-rapidity distributions, such as the one observed in ISR as well as in recent \(\bar pp\) collider experiments may well be understood in terms of the previously studied hydrodynamically-expanding large-cluster model. 相似文献
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Yogiro Hama Fernando Silveira Navarra 《Zeitschrift fur Physik C Particles and Fields》1992,53(3):501-506
Transverse-momentum distributions of andK have been analyzed within a framework of the hydrodynamical model to obtain the
dependence of the collective transverse flow and the dissociation temperatureT
d inpp- and
-induced multiparticle production reactions. The main outcomes are the steadily increasing transverse flow and a slowly decreasingT
d as the incident energy increases. This behavior is in excellent agreement with early Landau's estimate. An extension of this to nucleus-nucleus collisions correctly gives account of the very soft component which has been observed in heavyion experiments. 相似文献
8.
D.A. Fogaça F.S. Navarra L.G. Ferreira Filho 《Communications in Nonlinear Science & Numerical Simulation》2013,18(2):221-235
The Kadomtsev–Petviashvili (KP) nonlinear wave equation is the three dimensional generalization of the Korteveg-de Vries (KdV) equation. We show how to obtain the cylindrical KP (cKP) and cartesian KP in relativistic fluid dynamics. The obtained KP equations describe the evolution of perturbations in the baryon density in a strongly interacting quark gluon plasma (sQGP) at zero temperature. We also show the analytical solitary wave solution of the KP equations in both cases. 相似文献
9.
V. P. Gonçalves M. S. Kugeratski E. R. Cazaroto F. Carvalho F. S. Navarra 《The European Physical Journal C - Particles and Fields》2011,71(10):1-9
Perturbative QCD predicts that the growth of the gluon density at high energies should saturate, forming a Color Glass Condensate (CGC), which is described in mean field approximation by the Balitsky–Kovchegov (BK) equation. In this paper we study the γγ interactions at high energies and estimate the main observables which will be probed at future linear colliders using the color dipole picture. We discuss in detail the dipole–dipole cross section and propose a new relation between this quantity and the dipole scattering amplitude. The total γγ, γ ? γ ? cross sections and the real photon structure function $F_{2}^{\gamma }(x,Q^{2})$ are calculated using the recent solution of the BK equation with running coupling constant and the predictions are compared with those obtained using phenomenological models for the dipole–dipole cross section and scattering amplitude. We demonstrate that these models are able to describe the LEP data at high energies, but predict a very different behavior for the observables at higher energies. Therefore we conclude that the study of γγ interactions can be useful to constrain the QCD dynamics. 相似文献
10.
M.S. Kugeratski V.P. Gonçalves F.S. Navarra 《The European Physical Journal C - Particles and Fields》2006,46(2):465-473
Perturbative quantum chromodynamics (pQCD) predicts that the small-x gluons in a hadron wavefunction should form a color glass
condensate (CGC), characterized by a saturation scale Qs(x,A), which is energy and atomic number dependent. In this paper, we study the predictions of CGC physics for electron-ion
collisions at high energies. We consider that the nucleus at high energies acts as an amplifier of the physics of high parton
densities and estimate the nuclear structure function F2A(x,Q2), as well as the longitudinal and charm contributions, using a generalization for nuclear targets of the Iancu–Itakura–Munier
model that describes the ep HERA data quite well. Moreover, we investigate the behavior of the logarithmic slopes of the total
and longitudinal structure functions in the kinematical region of the future electron-ion collider eRHIC. 相似文献