Supercritical super-Brownian motion with a general branching mechanism and travelling waves

We consider the classical problem of existence, uniqueness and asymptotics of monotone solutions to the travelling wave equation associated to the parabolic semi-group equation of a super-Brownian motion with a general branching mechanism. Whilst we are strongly guided by the probabilistic reasoning of Kyprianou (2004) for branching Brownian motion, the current paper offers a number of new insights. Our analysis incorporates the role of Seneta-Heyde norming which, in the current setting, draws on classical work of Grey (1974). We give a pathwise explanation of Evans' immortal particle picture (the spine decomposition) which uses the Dynkin-Kuznetsov N-measure as a key ingredient. Moreover, in the spirit of Neveu's stopping lines we make repeated use of Dynkin's exit measures. Additional complications arise from the general nature of the branching mechanism. As a consequence of the analysis we also offer an exact X(log X)^2 moment dichotomy for the almost sure convergence of the so-called derivative martingale at its critical parameter to a non-trivial limit. This differs to the case of branching Brownian motion and branching random walk where a moment `gap' appears in the necessary and sufficient conditions.Comment: 34 page

Femtosecond XUV induced dynamics of the methyl iodide cation

Ultrashort XUV wavelength-selected pulses obtained with high harmonic generation are used to study the dynamics of molecular cations with state-to-state resolution. We demonstrate this by XUV pump - IR probe experiments on CH3I+ cations and identify both resonant and non-resonant dynamics

Potential uptake of dissolved organic matter by seagrasses and macroalgae

Dissolved organic nitrogen (DON) acts as a large reservoir of fixed nitrogen. Whereas DON utilization is common in the microbial community, little is known about utilization by macrophytes. We investigated the ability of the coexisting temperate marine macrophytes Zostera noltii, Cymodocea nodosa, and Caulerpa prolifera to take up nitrogen and carbon from small organic substrates of different molecular complexities (urea, glycine, L-leucine, and L-phenylalanine) and from dissolved organic matter (DOM) derived from algal and bacterial cultures (substrates with a complex composition). In addition to inorganic nitrogen, nitrogen from small organic substrates could be taken up in significant amounts by all macrophytes. Substrate uptake by the aboveground tissue differed from that of the belowground tissue. No relationships between carbon and nitrogen uptake of small organics were found. The preference for individual organic substrates was related to their structural complexity and C:N ratio. Uptake of algae-derived organic nitrogen was of similar magnitude as inorganic nitrogen, and was preferred over bacteria-derived nitrogen. These results add to the growing evidence that direct or quick indirect DON utilization may be more widespread among aquatic macrophytes than traditionally thought.This research was supported by the regional government of Andalusia project FUNDIV (P07-RNM-2516), the Spanish Project CTM2008-00012/MAR, a European Reintegration Grant (MERG-CT-2007-205675), a travel grant from Schure-Beijerinck-Popping Fund (SBP/JK/2007-32) and the Netherlands Organization for Scientific Research. Thanks to Fidel Echevarrìa Navas (Director of CACYTMAR) for granting us access to facilities, and to Bas Koutstaal for helping with sample processing. We also thank the anonymous reviewers for their valuable comments which significantly improved this manuscript

Enriched elderly virtual profiles by means of a multidimensional integrated assessment platform

The pressure over Healthcare systems is increasing in most developed countries. The generalized aging of the population is one of the main causes. This situation is even worse in underdeveloped, sparsely populated regions like Extremadura in Spain or Alentejo in Portugal. The authors propose to use the Situational-Context, a technique to seamlessly adapt Internet of Things systems to the needs and preferences of their users, for virtually modeling the elderly. These models could be used to enhance the elderly experience when using those kind of systems without raising the need for technical skills or the costs of implementing such systems by the regional healthcare systems. In this paper, the integration of a multidimensional integrated assessment platform with such virtual profiles is presented. The assessment platform provides and additional source of information for the virtual profiles that is used to better adapt existing systems to the elders needs

Disentangling the jet emission from protostellar systems. The ALMA view of VLA1623

Context: High-resolution studies of class 0 protostars represent the key to constraining protostar formation models. VLA16234-2417 represents the prototype of class 0 protostars, and it has been recently identified as a triple non-coeval system. Aim: We aim at deriving the physical properties of the jets in VLA16234-2417 using tracers of shocked gas. Methods: ALMA Cycle 0 Early Science observations of CO(2-1) in the extended configuration are presented in comparison with previous SMA CO(3-2) and Herschel-PACS [OI}] 63 micron observations. Gas morphology and kinematics were analysed to constrain the physical structure and origin of the protostellar outflows. Results: We reveal a collimated jet component associated with the [OI] 63 micron emission at about 8'' (about 960 AU) from source B. This newly detected jet component is inversely oriented with respect to the large-scale outflow driven by source A, and it is aligned with compact and fast jet emission very close to source B (about 0.3'') rather than with the direction perpendicular to the A disk. We also detect a cavity-like structure at low projected velocities, which surrounds the [OI] 63 micron emission and is possibly associated with the outflow driven by source A. Finally, no compact outflow emission is associated with source W. Conclusions: Our high-resolution ALMA observations seem to suggest there is a fast and collimated jet component associated with source B. This scenario would confirm that source B is younger than A, that it is in a very early stage of evolution, and that it drives a faster, more collimated, and more compact jet with respect to the large-scale slower outflow driven by A. However, a different scenario of a precessing jet driven by A cannot be firmly excluded from the present observations.Comment: Accepted for publication in Astronomy & Astrophysic

Investigación minera por estaño en la reserva nº 146 "Villardeciervos" (Orense)

[Resumen] La presente comunicación concierne a los trabajos realizados y resultados obtenidos en la investigación llevada a cabo por ENADIMSA, en la Reserva a favor del Estado na 146, "Villardeciervos". Se investigaron tres zonas de interés potencial que habían sido puestas de manifiesto en trabajos anteriores realizados por el IGME, reflejados en el infonne "Estimación del potencial minero en la zona de Villardevós-(Orense)" (1970). Los resultados fueron considerados negativos en lo que a interés minero se refiere[Abstract] This paper deals with the work and results obtained during the investigation, carried out by ENADIMSA, at "Villadeciervos" state reservation, na 146. Three potentially interesting areas, previously evidenced by studies conducted by the "IGME", which are described in the report: "Estimación del potencial minero en la zona de Villardevós-(Orense)" (1976), were investigated. With respect to mineral potential the results obtamded were considered to be negativ

Temperature Relaxation in Hot Dense Hydrogen

Temperature equilibration of hydrogen is studied for conditions relevant to inertial confinement fusion. New molecular-dynamics simulations and results from quantum many-body theory are compared with Landau-Spitzer (LS) predictions for temperatures T from 50 eV to 5000 eV, and densities with Wigner-Seitz radii r_s = 1.0 and 0.5. The relaxation is slower than the LS result, even for temperatures in the keV range, but converges to agreement in the high-T limit.Comment: 4 pages PRL style, two figure

EU Cohesion policy 2007-13 and the implications for Spain : who gets what, when and how?

The recent negotiation of the EU budget and the associated reform of EU Cohesion policy have had major policy implications for Spain, the country in receipt of most Cohesion policy support in the current programming period (2000-06). EU enlargement, combined with relatively rapid growth in Spain, impacted on the eligibility of Spanish regions for Cohesion support while also taking the country as a whole beyond the eligibility threshold for the Cohesion Fund. As a result, based on the original Commission budget proposals of February 2004, Spain was facing a reduced Cohesion policy budget of at least a half (to below €30 billion). This paper first reviews the budget negotiations from a Spanish (Cohesion policy) perspective, identifying the key negotiating goals and the extent to which they were achieved. It then looks at the outcome of the negotiations for Spain, initially at the national level and then in the regions. It highlights the significant differential impacts of the cutbacks in Cohesion policy allocations at the regional level and the pressures on the Spanish government to modulate the regional impact of the budgetary changes. Having considered the direct funding implications of the new Cohesion policy, the second half of the paper is concerned with the regulatory, institutional and economic impacts of the new policy regime. Many of the reform proposals fit with Spanish priorities, not least the new rationale for Cohesion policy (with its stress on the Lisbon and Gothenburg agendas) and the new policy architecture (with all regions eligible for some form of support and with a related shift from a geographic to more of a thematic focus). The retention of the key Structural Funds principles has also been welcomed in Spain, unsurprising given the wealth of experience and expertise built up over three (high-spending) programming cycles. As in most Member States, the main regulatory concern relates to the extent to which a more simplified and devolved approach to Funds' implementation will be achieved in practice. As regards policy and institutional impacts, the paper brings together regional views on the new budgetary and regulatory frameworks and reviews how the new regulations are being implemented in practice. A discussion of the developing National Strategic Reference Framework and the related Operational Programmes makes clear that the strong emphasis on the Lisbon agenda is not viewed as a constraint in Spain; rather, it is felt to fit well with recent Spanish developments and goals. Finally, the paper considers the economic implications of the reductions in Cohesion policy support. On the basis of evaluation studies, it highlights the positive impact the Funds have had in the past and the potentially quite varied regional impacts the reductions in funding may have in the future

Incentivos para una gestión forestal sostenible y refuerzo del papel de los boques como sumideros de CO2

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