Study of the ejection/collision orbits in the spatial RTBP using the McGehee regularization

In this paper we analyse the McGehee regularization of the collision in the spatial Restricted three-body problem (3D RTBP). As a particular application, we study the ejection (collision) orbits. The parameterization method is applied up to high order to obtain suitable initial conditions of ejection (collision) orbits. Moreover, assuming ejection orbits, different methods are discussed to detect which of them are also collision orbits. Finally we explore the so called ejection-collision (EC) orbits, that is, orbits where the particle ejects from one primary, reaches a maximum in the distance with respect to the same primary, and ends at collision with that primary. Some results concerning the existence of spatial EC orbits are described.M. Ollé and O. Rodríguez were supported by the Spanish MINECO/FEDER grant PGC2018-100928-B-I00 and the Catalan, Spain grant 2017SGR-1049. M. Ollé is also supported by the Spanish Maria de Maeztu grant R&D CEX2020-001084-M. J. Soler was supported by MTM2016-77278-P.Peer ReviewedPostprint (author's final draft

Analytical and numerical results on families of n-ejection-collision orbits in the RTBP

© 2020. ElsevierIn the planar RTBP with mass ratio µ we regularise the singularity at one of the primaries by means of Levi-Civita’s transformation in a rotating frame. We solve the variational equations in a neighbourhood of the ejection/collision orbits, giving analytic expressions for the first terms in µ of the convergent expansion for orbits with eccentricity e¿¿¿1. For high enough values of the Jacobi constant C we give analytic expressions for the coefficients of the above expansion in powers of the small parameter and we prove the existence of four families of the so called n-ejection-collision (EC) orbits, that are orbits which eject from the primary and reach n relative maxima in the distance with the primary before finally colliding with it. Moreover, massive numerical explorations extending the analytical result for any value of the mass ratio and bigger ranges of C are also shown and discussed.Peer ReviewedPostprint (author's final draft

Transit regions and ejection/collision orbits in the RTBP

In this paper we analyse the global behaviour of the whole set of ejection orbits in the planar circular RTBP. We consider ejection from the big or the small primary, that is we take the mass parameter µ, the mass traditionally associated with the small primary, in a range of values µ ¿ (0,1) (the other primary has mass 1-µ). A discussion on the relation between the Lyapunov periodic orbit around the collinear equilibrium point L1 and the ejection orbits is carried out in the range of values of the Jacobi constant such that the associated Hill regions permit only a bounded movement. In particular a chaotic in¿nity of heteroclinic connections between a primary and the LPO1 are obtained. As a consequence a chaotic in¿nity of ejection-collision orbits is also derived. Finally, 2D plots, called colour code diagrams, allow to describe the global dynamics of the ejection orbits given a range of time. Such diagrams provide a very accurate understanding of the dynamics of the orbits under discussion.M. Ollé and O. Rodríguez were supported by the Spanish MINECO/FEDER grant PGC2018-100928-B-100 and the Catalan grant 2017SGR-1049. J. Soler was supported by MTM2016-77278-P.Peer ReviewedPostprint (author's final draft

Generalized analytical results on n-ejection–collision orbits in the RTBP: analysis of bifurcations

In the planar circular restricted three-body problem and for any value of the mass parameter µ¿(0,1) and n=1 , we prove the existence of four families of n-ejection–collision (n-EC) orbits, that is, orbits where the particle ejects from a primary, reaches n maxima in the (Euclidean) distance with respect to it and finally collides with the primary. Such EC orbits have a value of the Jacobi constant of the form C=3µ+Ln2/3(1-µ)2/3 , where L>0 is big enough but independent of µ and n. In order to prove this optimal result, we consider Levi-Civita’s transformation to regularize the collision with one primary and a perturbative approach using an ad hoc small parameter once a suitable scale in the configuration plane and time has previously been applied. This result improves a previous work where the existence of the n-EC orbits was stated when the mass parameter µ>0 was small enough. Moreover, for decreasing values of C, there appear some bifurcations which are first numerically investigated and afterward explicit expressions for the approximation of the bifurcation values of C are discussed. Finally, a detailed analysis of the existence of n-EC orbits when µ¿1 is also described. In a natural way, Hill’s problem shows up. For this problem, we prove an analytical result on the existence of four families of n-EC orbits, and numerically, we describe them as well as the appearing bifurcations.Peer ReviewedPostprint (author's final draft

Detection of West Nile virus lineage 2 in North-Eastern Spain (Catalonia)

Funding: Departament d'Agricultura, Ramaderia, Pesca i Alimentació of the Generalitat de Catalunya; Ministerio de Agricultura y Pesca, Alimentación y Medio Ambiente (MAPAMA)In September 2017, West Nile virus () lineage 2 was detected in Catalonia (Northern Spain) in northern goshawks by passive surveillance. The phylogenetic analyses showed that it was related to the Central/Southern European strains, evidencing lineage 2 spread to Western Europe. local transmission was later detected in bearded vultures housed at the Wildlife Recovery center where the goshawk was transferred to. Further studies, before the following period of high mosquito activity, indicated that had circulated intensively in poultry and horses but only surrounding of the area where the virus was detected. In other areas of Catalonia, circulation of flaviviruses different to was identified. Public Health investigations failed to detect infection in humans

Detection of West Nile virus lineage 2 in North‐Eastern Spain (Catalonia)

In September 2017, West Nile virus (WNV) lineage 2 was detected in Catalonia (Northern Spain) in northern goshawks by passive surveillance. The phylogenetic analyses showed that it was related to the Central/Southern European strains, evidencing WNV lineage 2 spread to Western Europe. WNV local transmission was later detected in bearded vultures housed at the Wildlife Recovery center where the goshawk was transferred to. Further studies, before the following period of high mosquito activity, indicated that WNV had circulated intensively in poultry and horses but only surrounding of the area where the virus was detected. In other areas of Catalonia, circulation of flaviviruses different to WNV was identified. Public Health investigations failed to detect WNV infection in humans.info:eu-repo/semantics/publishedVersio

Protocol per a la vigilància i el control de les arbovirosis importades transmeses per mosquits a Catalunya

Arbovirus; Mosquits; Malalties víriquesArboviruses; Mosquitoes; Viral diseasesArbovirus; Mosquitos; Enfermedades víricasThis protocol aims to provide a guide for the surveillance of the most likely arbovirosis transmitted by mosquito vectors in Catalonia (West Nile virus, dengue and chikungunya), establishing a set of surveillance activities for these diseases and control of the vectors, depending on the risk level of arbovirosisEste protocolo tiene como objetivo ofrecer una guía para la vigilancia de las arbovirosi más probables transmitidas por vectores mosquitos en Cataluña (virus del Nilo Occidental, dengue y chikungunya), estableciendo un conjunto de actividades de vigilancia de estas enfermedades y de control los vectores, según el nivel de riesgo de arbovirosiAquest protocol té com a objectiu oferir una guia per a la vigilància de les arbovirosis més probables transmeses per vectors mosquits a Catalunya (virus del Nil Occidental, dengue i chikungunya), establint un conjunt d’activitats de vigilància d’aquestes malalties i de control dels vectors, segons el nivell de risc d’arbovirosi

Protocol d'actuació davant de casos de febre vírica de Zika en l'àmbit obstètric i pediàtric de Catalunya

Virus del Zika; Obstetrícia; PediatriaZika virus; Obstetrics; PediatricsObstetricia; PediatríaAquest document dóna recomanacions d'actuació per a la prevenció, detecció i tractament del virus del Zika a Catalunya

Protocol per a la vigilància i el control de les arbovirosis transmeses per mosquits a Catalunya

Arbovirus; Mosquits; Malalties víriquesArboviruses; Mosquitoes; Viral diseasesArbovirus; Mosquitos; Enfermedades víricasThis protocol aims to provide a guide for the surveillance of the most likely arbovirosis transmitted by mosquito vectors in Catalonia (West Nile virus, dengue and chikungunya), establishing a set of surveillance activities for these diseases and control of the vectors, depending on the risk level of arbovirosisEste protocolo tiene como objetivo ofrecer una guía para la vigilancia de las arbovirosi más probables transmitidas por vectores mosquitos en Cataluña (virus del Nilo Occidental, dengue y chikungunya), estableciendo un conjunto de actividades de vigilancia de estas enfermedades y de control los vectores, según el nivel de riesgo de arbovirosiAquest protocol té com a objectiu oferir una guia per a la vigilància de les arbovirosis més probables transmeses per vectors mosquits a Catalunya (virus del Nil Occidental, dengue i chikungunya), establint un conjunt d’activitats de vigilància d’aquestes malalties i de control dels vectors, segons el nivell de risc d’arbovirosi

A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

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