2,055 research outputs found

    Social-ecological System of Seagrass and Small-scale Fisheries Connectivity in Malang Rapat and Berakit Villages, Bintan District, Riau Islands

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    Seagrass ecosystem has important roles in ecological and social factors to support fisherman income. The purpose of this research was to map the social-ecological system connectivity of seagrass with small-scale fisheries with networks perspective, to identify social-ecological connectivity of seagrass with fisheries resource availability approaches in small-scale fisheries, and to estimate the benefits of fish resources relation to seagrass ecosystem in Malang Rapat and Berakit vilages. Social-ecological system connectivity of seagrass was proven by the spatial distribution of fishing areas, networks map markets, and dynamics of small-scale fisheries catches in the study site. Social-ecocoligal connectivity of seagrass was also proven by fish catches dominated by Siganidae, Scaridae, Lethrinidae, and Lutjanidae families. The fishermen income was supported by seagrass ecosystem connectivity which contributed revenue from fish catches totally Rp 202,124,00/day in Malang Rapat village and Rp. 193,151,00/day in Berakit village. Other benefit of seagrass ecosystem located nearby the beach was that the fishermen can have an easy access or less fuel for fishing operation

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

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    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
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