A variety of large-scale diffuse radio structures have been identified in many clusters with the advent of new state-of-the-art facilities in radio astronomy. Among these diffuse radio structures, radio mini-halos are found in the central regions of cool core clusters. Their origin is still unknown and they are challenging to discover; less than thirty have been published to date. Based on new VLA observations, we confirmed the mini-halo in the massive strong cool core cluster PKS 0745−191 (z = 0.1028) and discovered one in the massive cool core cluster MACS J1447.4+0827 (z = 0.3755). Furthermore, using a detailed analysis of all known mini-halos, we explore the relation between mini-halos and AGN feedback processes from the central galaxy. We find evidence of strong, previously unknown correlations between mini-halo radio power and X-ray cavity power, and between mini-halo and the central galaxy radio power related to the relativistic jets when spectrally decomposing the AGN radio emission into a component for past outbursts and one for on-going accretion. Overall, our study indicates that mini-halos are directly connected to the central AGN in clusters, following previous suppositions. We hypothesize that AGN feedback may be one of the dominant mechanisms giving rise to mini-halos by injecting energy into the intra-cluster medium and reaccelerating an old population of particles, while sloshing motion may drive the overall shape of mini-halos inside cold fronts. AGN feedback may therefore not only play a vital role in offsetting cooling in cool core clusters, but may also play a fundamental role in re-energizing non-thermal particles in clusters.

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This paper adopts a conventionalist approach to shed light on the measurement and reification problems that underlie the quantification of desistance from crime in the scientific literature. Analysis of 100 papers spanning three decades indicates that approaches based on theoretical classification have recently lost ground in favor of more sophisticated techniques aimed at empirically identifying subgroups. These techniques convey the impression of objectiveness among statistics users and consumers and, as a result, the classification “desisters” and “persisters” are increasingly reified. Findings suggest that the quantification of desistance is intimately linked to the maintenance of a classification system that constitutes delinquency as a stable category and contributes to “making” up new kinds of people over which institutions can legitimately intervene.

This study aimed to explore staff and patients' views on the violence prevention climate in civil and forensic mental health settings. We conducted a cross-sectional survey of 110 inpatients and 198 staff members from three civil mental health hospitals (including two forensic units) and one forensic mental health hospital in Canada. Staff and patients' perceptions of the violence prevention climate on civil and forensic mental health units were measured using the modified violence prevention climate scale, French version (VPC-M-FR). Multiple analyses of variance (ANOVAs) were performed to assess differences in the VPC-M-FR total and subscale scores (staff action, patient action, therapeutic environment) between patients and staff, settings (civil vs. forensic), restrictive practices (presence vs. absence of seclusion or restraints), incidents of violence during hospitalization (presence vs. absence), and victimization (presence vs. absence). In both settings, patients' views of the violence prevention climate were significantly more positive than those of the staff. Staff in forensic mental health settings had a more positive perception of the violence prevention climate than those in civil mental health units. The results contribute to a better understanding of the violence prevention climate among staff and patients and will guide future interventions within civil and forensic settings.