Strategic Resonance and Innovation in Public Security Services in Brazil

The aim of this study was to test an exploratory contribution of a model for the relationship between strategic resonance (SR) and innovation in public security services (IPSS), with the construction of two scales. The subject of this analysis are the Federal District Military Police (PMDF) Community Security Stations (CSSs). The model for the relationship was tested using structural equation modeling (SEM) of innovation in public security services (IPSS) and strategic resonance (SR) explanatory variables. The results show that the structural relationships postulated between the variables are corroborated by the global sample analyses, obtaining evidence of scale validation. It was concluded that the CSSs are an IPSS, where it is observed that policing is linked to interactions between the population and PMDF in a relationship comprising the human, structural and operational characteristics of the service. The main contributions of this research are the proposal of a relationship between SR and IPSS and the development and validation of two scales that measure these two constructs

POLÍTICAS DE ACESSO À EDUCAÇÃO SUPERIOR E DESEMPENHO DE ALUNOS BOLSISTAS: O CASO DE UMA UNIVERSIDADE PRIVADA DE NATAL/RN

Para aumentar a quantidade de estudantes no ensino superior, diversos programas governamentais vem sendo desenvolvidos no Brasil. mas como está o desempenho acadêmico do estudante bolsista? O objetivo do estudo foi o de realizar um estudo comparativo do índice de rendimento acadêmico (IRA) de alunos bolsistas do PROUNI (Federal), PROEDUC (Municipal) e não bolsistas no curso de Administração de uma universidade privada em uma capital nordestina. Foi desenvolvida uma pesquisa descritiva bom abordagem do problema um estudo é quantitativo. Foi utilizada uma base de dados com IRA de 2571 alunos, do curso de administração, caracterizando o estudo como uma pesquisa censitária. A pesquisa foi embasada na econometria, mais especificamente na análise de regressão simples e múltipla. Os resultados mostraram que as médias dos alunos bolsistas foi superior a dos alunos não-bolsistas, destacando-se as notas dos bolsistas PROUNI (programa federal), maior que as notas dos bolsistas PROEDUC (programa municipal). O resultado de melhor desempenho do IRA dos alunos bolsistas do PROUNI, sobre os alunos bolsistas do PROEDUC, e dos alunos bolsistas do PROEDUC, sobre os alunos não bolsistas ficou demonstrando na análise de regressão simples, bem como, na análise de regressão múltipla. A política de bolsas de estudos para o ensino superior, seja Federal ou Municipal, permitem além da inclusão de jovens no ensino superior, segundo a pesquisa aqui descrita, também favorecem que os alunos tenham um melhor desempenho acadêmico

Studies of the mass composition of cosmic rays and proton-proton interaction cross-sections at ultra-high energies with the Pierre Auger Observatory

In this work, we present an estimate of the cosmic-ray mass composition from the distributions of the depth of the shower maximum (Xmax) measured by the fluorescence detector of the Pierre Auger Observatory. We discuss the sensitivity of the mass composition measurements to the uncertainties in the properties of the hadronic interactions, particularly in the predictions of the particle interaction cross-sections. For this purpose, we adjust the fractions of cosmic-ray mass groups to fit the data with Xmax distributions from air shower simulations. We modify the proton-proton cross-sections at ultra-high energies, and the corresponding air shower simulations with rescaled nucleus-air cross-sections are obtained via Glauber theory. We compare the energy-dependent composition of ultra-high-energy cosmic rays obtained for the different extrapolations of the proton-proton cross-sections from low-energy accelerator data

Study of downward Terrestrial Gamma-ray Flashes with the surface detector of the Pierre Auger Observatory

The surface detector (SD) of the Pierre Auger Observatory, consisting of 1660 water-Cherenkov detectors (WCDs), covers 3000 km2 in the Argentinian pampa. Thanks to the high efficiency of WCDs in detecting gamma rays, it represents a unique instrument for studying downward Terrestrial Gamma-ray Flashes (TGFs) over a large area. Peculiar events, likely related to downward TGFs, were detected at the Auger Observatory. Their experimental signature and time evolution are very different from those of a shower produced by an ultrahigh-energy cosmic ray. They happen in coincidence with low thunderclouds and lightning, and their large deposited energy at the ground is compatible with that of a standard downward TGF with the source a few kilometers above the ground. A new trigger algorithm to increase the TGF-like event statistics was installed in the whole array. The study of the performance of the new trigger system during the lightning season is ongoing and will provide a handle to develop improved algorithms to implement in the Auger upgraded electronic boards. The available data sample, even if small, can give important clues about the TGF production models, in particular, the shape of WCD signals. Moreover, the SD allows us to observe more than one point in the TGF beam, providing information on the emission angle

Combined fit to the spectrum and composition data measured by the Pierre Auger Observatory including magnetic horizon effects

The measurements by the Pierre Auger Observatory of the energy spectrum and mass composition of cosmic rays can be interpreted assuming the presence of two extragalactic source populations, one dominating the flux at energies above a few EeV and the other below. To fit the data ignoring magnetic field effects, the high-energy population needs to accelerate a mixture of nuclei with very hard spectra, at odds with the approximate E$^{-2}$ shape expected from diffusive shock acceleration. The presence of turbulent extragalactic magnetic fields in the region between the closest sources and the Earth can significantly modify the observed CR spectrum with respect to that emitted by the sources, reducing the flux of low-rigidity particles that reach the Earth. We here take into account this magnetic horizon effect in the combined fit of the spectrum and shower depth distributions, exploring the possibility that a spectrum for the high-energy population sources with a shape closer to E$^{-2}$ be able to explain the observations

Radio Interferometry applied to air showers recorded by the Auger Engineering Radio Array

A new radio interferometric technique was recently developed that takes into account time lags caused by the three-dimensional dependency of the refractive index in the atmosphere. It enables us to track the extensive air shower while it propagates through the atmosphere. Using this technique, properties of the air shower can be estimated, like the depth of maximum and the axis of propagation. In order to apply this method, strict constraints on the time-synchronisation between radio antennas in an array must be satisfied. In this contribution, we show that the Auger Engineering Radio Array can meet these timing criteria by operating a time reference beacon. We will show how this enables us to reconstruct air shower properties using the radio interferometric technique