14 research outputs found
The endoscopic endonasal approach is not superior to the microscopic transcranial approach for anterior skull base meningiomas-a meta-analysis
Scientific Assessment and Innovation in Neurosurgical Treatment Strategie
TOI-481 b and TOI-892 b: Two Long-period Hot Jupiters from the Transiting Exoplanet Survey Satellite
We present the discovery of two new 10 day period giant planets from the Transiting Exoplanet Survey Satellite mission, whose masses were precisely determined using a wide diversity of ground-based facilities. TOI-481 b and TOI-892 b have similar radii (0.99 0.01 and 1.07 0.02, respectively), and orbital periods (10.3311 days and 10.6266 days, respectively), but significantly different masses (1.53 0.03, respectively). Both planets orbit metal-rich stars ( = dex and = for TOI-481 and TOI-892, respectively) but at different evolutionary stages. TOI-481 is a = 1.14 0.02 = 1.66 0.02 G-type star (=K), that with an age of 6.7 Gyr, is in the turn-off point of the main sequence. TOI-892 on the other hand, is a F-type dwarf star (=K), which has a mass of = 1.28 0.03 and a radius of = 1.39 0.02. TOI-481 b and TOI-892 b join the scarcely populated region of transiting gas giants with orbital periods longer than 10 days, which is important to constrain theories of the formation and structure of hot Jupiters
Environmental activation of citizens in the context of policy agenda formation and the influence of social capital
Public policy issues arising from climate change projections are becoming increasingly important in terms of the range and the scope of their effects. In order to effectively confront them it is important to address social, environmental and economic aspects as fully as possible in decision-making processes. In this context, social risk assessment techniques have begun to be applied to explore citizens’ risk perceptions of climate change projections. The present study aims to contribute to this area by examining the influence of four social capital parameters (social trust, institutional trust, social norms and social networks) on public risk perceptions of climate change. An empirical study was conducted for this purpose in Greece’s fourth largest city, Heraklion. Results demonstrate that social capital is a significant explanatory parameter for citizens’ risk perceptions. Specifically, individuals with lower levels of social capital tend to perceive higher risks from climate change impacts. The most important parameter explaining this result is the low level of institutional trust, revealing that Heraklion’s citizens do not believe that existing public institutions will be able to effectively manage projected climate change impacts
The reactions π π → π π and γ γ → π π in χ PT with an isosinglet scalar resonance
The lowest-lying resonance in the QCD spectrum is the isoscalar
meson, also known as the . We augment SU(2) chiral
perturbation theory (PT) by including the meson as an additional
explicit degree of freedom, as proposed by Soto, Talavera, and Tarr\'us and
others. In this effective field theory, denoted PT, the
meson's well-established mass and decay width are not sufficient to properly
renormalize its self energy. At another low-energy constant
appears in the dressed -meson propagator; we adjust it so that the
isoscalar pion-pion scattering length is also reproduced. We compare the
resulting amplitudes for the and
reactions to data from threshold through the
energies at which the -meson resonance affects observables. The
leading-order (LO) amplitude reproduces the -meson pole
position, the isoscalar scattering lengths and scattering
and data up to GeV.
It also yields a amplitude that obeys the Ward
identity. The value obtained for the polarizability is, however, only
slightly larger than that obtained in standard PT.Comment: 17 pages, 7 figures. This version, which will be published in
European Physical Journal A, contains clarification and more explanation of
several points, as well as additional reference