RESUMEN
A capable one-step method, femtosecond laser ablation of solids in liquids, was successfully applied to prepare lithium metal nanoparticles to mitigate the initial capacity loss and improve the electrochemical performance of a graphite-based electrode as a Li-host anode. Remarkably, according to the physicochemical characterization, this advanced optical method allowed to obtain uniform spheroidal and crystalline Li nanoparticles with an average particle size <20 nm. These novel ultrafine Li nanoparticles significantly decrease the initial capacity loss of a graphite-based anode, leading to reach high coulombic efficiency (>99 %), good specific charge capacity (322 mAh/g), and superior capacity retention (96 %) at an applied current density of 100 mA g-1 after 200 cycles.
RESUMEN
The 2019 novel coronavirus outbreak hit most countries and cities globally, dramatically impacting how people live during lockdown periods. Compulsorily, socioeconomic activities and mobility patterns changed while long-lasting structural changes might remain. Focusing on this very particular liminal event, this paper aims to present and analyze the impact of the SARS-CoV-2 virus lockdown on the behavior change of cyclists and previously non-cyclists in Lisbon, Portugal, knowing that no concomitant interventions occurred in the cycling environment during the period analyzed (e.g., pop-up interventions). From a 1-min questionnaire in 5 locations in Lisbon's existing cycling lanes, we aimed to collect (n = 493) revealed preferences on cycling frequency before and after the lockdown, which we used to calibrate a weighted multinomial logit model to analyze respondents' probability of increasing, maintaining, or decreasing their cycling frequency. Results suggest that people tended to cycle more often after the lockdown than before. For every five cyclists, two cycled more frequently while two others maintained their cycling frequency. Most cycling trips were recreational or to exercise, and these increased after the lockdown, while trips for work and school decreased, as expected. Moreover, the lower the individuals' cycling frequency levels before the lockdown, the more they cycled after it. Our study diagnoses the impact of the lockdown on cycling habits, indicating an overall propensity to cycling more by the Lisbon citizens. Hence, authorities need to act and make quick infrastructural changes (e.g., pop-up cycling lanes) and encourage the population to use more bikes (e.g., financial incentives for bike purchases).
RESUMEN
PURPOSE: Black South African women and girls face high rates of violence victimization, including physical, sexual, and emotional abuse in childhood and intimate partner violence (IPV) in adulthood. U.S.-based research suggests that violence victimization predicts parenting difficulties, but this relation has not been examined in a South African context. METHOD: Among a sample of 99 Black South African female caregivers, we examined rates of child abuse, IPV, and cumulative trauma, and we explored the associations between caregivers' victimization history and current parenting quality (i.e., parent-child relationship quality & parental involvement with child). Caregivers completed self-report questionnaires using ACASI software. RESULTS: Hierarchical regression analyses revealed that caregivers reporting childhood physical or sexual abuse were less involved with their children. Caregivers with a history of emotional abuse reported significantly worse parent-child relationship quality. Cumulative trauma was associated with worse parental involvement and parent-child relationship quality. CONCLUSIONS: Results reveal relatively high rates of interpersonal violence victimization among this convenience sample of Black South African women, as well as unique relations between forms of victimization and specific parenting practices. The findings highlight the importance of behavioral parent training interventions with a focus on specific assessment of parents' victimization experiences.
