Dise?o, procura, construcci?n e implementaci?n de la torre de control para la nueva base aeronaval del Callao

Concebido por un equipo multidisciplinario, con diferentes visiones y experiencias para abordar los procesos de inicio y planificaci?n del proyecto ?Dise?o, procura, construcci?n e implementaci?n de la torre de control para la nueva base aeronaval del Callao?; permitiendo as? que la direcci?n de proyectos en sus diferentes fases de planeaci?n sea un proceso innovador, por medio de GISA, empresa de ingenier?a y construcci?n con una trayectoria de 20 a?os. El proyecto forma parte del megaproyecto de remodelaci?n de la base aeronaval del Callao para la Marina de Guerra del Per?. ?ste abarca la gesti?n, dise?o, procura construcci?n de una torre de control de medidas reglamentarias, implementaci?n de equipos de telecomunicaci?n de ?ltima generaci?n y capacitaci?n al personal usuario del cliente, hasta obtener la certificaci?n internacional. GISA ha establecido objetivos de eficiencia (2) alineados con la triple restricci?n, objetivos de producto (2) orientados a la conexi?n de los equipos de telecomunicaciones, as? como la obtenci?n de la certificaci?n aeron?utica internacional y satisfacci?n de stakeholders; para ello ha desarrollado los planes subsidiarios necesarios con plena conciencia de los factores pol?ticos, econ?micos, tecnol?gicos, ecol?gicos, legales y socioculturales presentes. El ?xito del proyecto posicionar? a GISA como un contratista preferente para el Estado

Forest and woodland replacement patterns following drought-related mortality

Forest vulnerability to drought is expected to increase under anthropogenic climate change, and drought-induced mortality and community dynamics following drought have major ecological and societal impacts. Here, we show that tree mortality concomitant with drought has led to short-term (mean 5 y, range 1 to 23 y after mortality) vegetation-type conversion in multiple biomes across the world (131 sites). Self-replacement of the dominant tree species was only prevalent in 21% of the examined cases and forests and woodlands shifted to nonwoody vegetation in 10% of them. The ultimate temporal persistence of such changes remains unknown but, given the key role of biological legacies in long-term ecological succession, this emerging picture of postdrought ecological trajectories highlights the potential for major ecosystem reorganization in the coming decades. Community changes were less pronounced under wetter postmortality conditions. Replacement was also influenced by management intensity, and postdrought shrub dominance was higher when pathogens acted as codrivers of tree mortality. Early change in community composition indicates that forests dominated by mesic species generally shifted toward more xeric communities, with replacing tree and shrub species exhibiting drier bioclimatic optima and distribution ranges. However, shifts toward more mesic communities also occurred and multiple pathways of forest replacement were observed for some species. Drought characteristics, species-specific environmental preferences, plant traits, and ecosystem legacies govern post drought species turnover and subsequent ecological trajectories, with potential far-reaching implications for forest biodiversity and ecosystem services.Peer reviewe

Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum