Bogolyubov approximation for diagonal model of an interacting Bose gas

We study, using the Bogolyubov approximation, the thermodynamic behaviour of a superstable Bose system whose energy operator in the second-quantized form contains a nonlinear expression in the occupation numbers operators. We prove that for all values of the chemical potential satisfying $\mu > \lambda(0)$, where $\lambda (0)\leq 0$ is the lowest energy value, the system undergoes Bose--Einstein condensation

Single- and double-drift bunchers as possible injection schemes for the CPS linac

Two bunching schemes are considered in the frame of the CPS Linac, one with a single buncher, the other with a double-drift harmonic buncher. The matching of the beam to the Linac acceptance in six phase-space dimensions is achieved by computer programs in an iterative way: zero current solutions are found first, and then the intensity is progressively raised until 200 mA are trapped into the Linac. (9 refs)

The difference of boundary effects between Bose and Fermi systems

In this paper, we show that there exists an essential difference of boundary effects between Bose and Fermi systems both for Dirichlet and Neumann boundary conditions: at low temperatures and high densities the influence of the boundary on the Bose system depends on the temperature but is independent of the density, but for the Fermi case the influence of the boundary is independent of the temperature but depends on the density, after omitting the negligible high-order corrections. We also show that at high temperatures and low densities the difference of the influence of the boundary between Bose and Fermi systems appears in the next-to-leading order boundary contribution, and the leading boundary contribution is independent of the density. Moreover, for calculating the boundary effects at high temperatures and low densities, since the existence of the boundary modification causes the standard virial expansion to be invalid, we introduce a modified virial expansion.Comment: 8 page

L'esquerda ecològica : residus industrials i geografia humana

Cet article propose une vision globale du problème des déchets industriels depuis une double perspective qui met l'accent sur le caractere socio-territorial des impacts, associés à leur présence dans l'environnement, et les conflits qui apparaissent autour des options de gestion actuellement en vigueur.This article presents a global view of the problems associated with industrial wastes using a dual perspective that emphasizes the socioterritorial nature of impacts and the conflicts appearing in the current management options.El articulo presenta una visión global de la problemática de los residuos industriales desde una doble perspectiva que destaca el carácter socio-territorial de los impactos, asociados a su presencia en el medio, y los conflictos que se suceden en torno a las opciones de gestión actualmente vigentes.L'article presenta una visió global de la problemitica dels residus industrials des d'una doble perspectiva que destaca el caracter socioterritorial dels impactes, associats a la seva presència en el medi, i els conflictes que s'esdevenen entorn a les opcions de gestió actualment vigents

Large Deviations in the Superstable Weakly Imperfect Bose Gas

The superstable Weakly Imperfect Bose Gas {(WIBG)} was originally derived to solve the inconsistency of the Bogoliubov theory of superfluidity. Its grand-canonical thermodynamics was recently solved but not at {point of} the {(first order)} phase transition. This paper proposes to close this gap by using the large deviations formalism and in particular the analysis of the Kac distribution function. It turns out that, as a function of the chemical potential, the discontinuity of the Bose condensate density at the phase transition {point} disappears as a function of the particle density. Indeed, the Bose condensate continuously starts at the first critical particle density and progressively grows but the free-energy per particle stays constant until the second critical density is reached. At higher particle densities, the Bose condensate density as well as the free-energy per particle both increase {monotonously}

Leucemia linfocítica crónica y su respuesta al tratamiento en un perro

Se presenta un caso clínico de leucemia linfocítica crónica en una perra, describiendo el curso de la enfermedad, los métodos diagnósticos empleados y su respuesta al tratamiento quimioterápico.A case of chronic lymphocytic leukemia in a bitch is presented. In this paper we describe the evolution of the disease, the diagnosis protocol and the response to a chemotherapeutic treatment

Level IV fugacity model by a continuous time control system.

A continuos time dynamic control system of the "Level IV Fugacity Model" is presented and applied to selected organic chemicals in evaluative environments system. In order to illustrate the numerical solution by this model a discretization is used to calculate the fugacity, concentration and fugacity settling time for a set of three insecticides applied in a hypothetical three compartmental environmental system. The model employs the fugacity concept and treats three bulk compartments: air, water and bottom sediment. Input to the model consists of a description of the environmental, the physical-chemical and reaction properties of the chemical, and emission rates. Expressions in matrix form are included for emissions, advections, reactions, and inter-phase transference. An algorithm to determine the values of the fugacities, concentrations and fugacity settling time is given

Eigenstructure of rank one updated matrices

[EN] The relationship among eigenvalues of a given square matrix A and the rank one updated matrix A+vkq⁎, where vk is an eigenvector of A associated with the eigenvalue λk and q is an arbitrary vector, was described by Brauer in 1952. In this work we study the relations between the Jordan structures of A and A+vkq⁎. More precisely, we analyze the generalized eigenvectors of the updated matrix in terms of the generalized eigenvectors of A, as well as the Jordan chains of the updated matrix. Further, we obtain similar results when we use a generalized eigenvector of A instead of the eigenvector vkSupported by the Spanish DGI grant MTM2013-43678-P.Bru García, R.; Cantó Colomina, R.; Urbano Salvador, AM. (2015). Eigenstructure of rank one updated matrices. Linear Algebra and its Applications. 485:372-391. https://doi.org/10.1016/j.laa.2015.07.036S37239148

Growth and optical properties of GaN/AlN quantum wells

We demonstrate the growth of GaN/AlN quantum well structures by plasma-assisted molecular-beam epitaxy by taking advantage of the surfactant effect of Ga. The GaN/AlN quantum wells show photoluminescence emission with photon energies in the range between 4.2 and 2.3 eV for well widths between 0.7 and 2.6 nm, respectively. An internal electric field strength of $9.2\pm 1.0$ MV/cm is deduced from the dependence of the emission energy on the well width.Comment: Submitted to AP

The GANIL beam lines

http://accelconf.web.cern.ch/AccelConf/c81/papers/ep-36.pdfInternational audienceThe general optical functions of the beam lines are described. The principle of beam lines composed of sections with separated functions was adopted. The main technological characteristics of the equipments (guiding system, buncher, stripper, beam diagnostics and pumping system) are given