On the Omori-Yau Maximum Principle and Geometric Applications

We introduce a version of the Omori-Yau maximum principle which generalizes the version obtained by Pigola-Rigoli-Setti 21. We apply our method to derive a non-trivial generalization Jorge-Koutrofiotis Theorem 15 for cylindrically bounded submanifolds due to Alias-Bessa-Montenegro 2, we extend results due to Alias-Dajczer 5, Alias-Bessa-Dajczer 1 and Alias-Impera-Rigoli 6

Rocinha: Twenty-nine years of witnessing contrasts

I remember Rocinha twenty years ago. It was then the largest favela (shantytown) in Latin America, but its people had another reason to be proud: despite the power of drug lords and the government’s neglect, it was the only favela in Rio de Janeiro to develop as a “normal” neighborhood. The settlers from Brazil’s northeastern region who came to live in Rocinha were known to be people who tried to improve their living conditions, even though they were in an unknown territory and had left their families behind. Although I was born in Rio, both my parents come from the northeast of Brazil, like most friends my age who live here. We were brought up to start working at an early age and generate income as soon as possible. However, I have always wanted to do something in Rocinha, since I believe there are lots of people who want to turn this place into a benchmark for actions designed to improve the life of favela-dwellers. Even before I started college, I already planned to do something big in Rocinha but had no idea of what it could be. It was during my freshman year as a student of journalism that I had the idea to start a community communications class, and FavelaDaRocinha.com was born. After six months online, there were ten people working on the website. They undertook every activity of the mainstream, conventional media – photography, writing, editorial meetings, and contacts with politicians and other important people to produce material. At the beginning, our common goal was to gain experience, a normal thing for undergraduates, and over time these first collaborators used this experience to enter the professional world. Today, fifteen people work on the website. Since Rocinha’s pacification, in November 2011, we have gained international recognition thanks to the live coverage of this operation on Twitter. We also became news ourselves in the media all over Brazil, and also internationally in outlets such as Al-Jazeera and BBC

The effect of combat sports experience, competition engagement, sex, and age on grit

Grit is expressed as hard work aiming to conquer life challenges while sustaining interest and effort throughout long periods and despite failures, adversities, and plateaus. Several benefits have been established in the literature related to higher levels of grit, including lower depression, higher life satisfaction, higher academic and financial outcomes, and lower criminality. As vigorous activities, combat sports have been shown to influence grit. The present study aimed to explore the potential correlations between grit and age, combat sports experience, and competitive engagement and compare group differences in grit based on sex, age, competition engagement, and combat sports experience. In this cross-sectional quantitative study, 329 combat sports practitioners ranging from 18 to 57 years of age responded to the grit scale and additional demographic information. Findings demonstrate positive correlations between grit and age, combats sports experience and competition engagement. Group comparison showed higher grit in the 38-47 and 48-57 groups than the 18-27 group, higher grit in the >5 years of experience group compared to the 4 competitions per year group showed higher grit than the 1-4 group but not than the non-competitors group. In conclusion, this study suggests that age, combat sports experience, and competitive engagement contribute to the development of grit in combat sports practitioners

Psychological Profile of Brazilian Jiu-Jitsu Athletes

Martial arts and combat sports have been shown to influence several desirable psychological factors positively. This quantitative study aimed to explore the differences in mental strength, resilience, grit, self-efficacy, self-control, aggression, life satisfaction, and mental health between belt ranks in Brazilian Jiu-Jitsu (BJJ) athletes. A sample of 410 BJJ participants (323 males and 87 females) from 18 to 60 years of age was included in this study. Data was collected anonymously via Google Form and included the Mental Strength Scale, Brief Resilience Scale, Grit Scale, General Self-Efficacy Scale, Brief Self-Control Scale, Brief Aggression Questionnaire, Satisfaction with Life Scale, Mental Health Disorders Screening Instrument for Athletes, and additional demographic information. Analyses of variance with Tukey post-hoc were performed to compare the psychological profile among BJJ belt ranks. Independent samples t-tests were performed to access the differences between white and black belts, and biological sexes. ANOVA revealed significantly higher grit in black belts than white and blue belts, in addition to higher grit in purple than white belts. Black belts reported significantly higher mental strength, resilience, grit, self-efficacy, self-control, life satisfaction, and better mental health than white belts. Moreover, significantly higher mental strength, resilience, and aggression were found in males than females. In conclusion, this study\u27s findings provide evidence of the positive impact of BJJ training on mental strength, resilience, grit, self-efficacy, self-control, life satisfaction, and mental health, with no significant differences in aggression after short-, mid-, and long-term engagement with BJJ

A Questão Cultural e sua Influência na Gestão de Equipes de Projetos Globais

The interactions between the project manager and team members may be affected by several variables, such as culture, leadership style of the project manager, and the complexity of the developed tasks. Focused in this context, the objective of this paper is to investigate and describe how the culture issue can affect the anagement of global project teams. It is a qualitative, descriptive study conducted in a large multinational company in the automotive sector. The results of this research show that cultural issues can influence both positively and negatively the management of project global teams and the managers of these projects have to deal with several management challenges that require the adoption of certain ways of dealing with culture impacts in managing their teams to minimize potential problems in this context.As interações entre o gerente de projetos e os membros da equipe podem ser afetadas por diversas variáveis, como a cultura, o estilo de liderança do gerente de projetos e a complexidade das tarefas desenvolvidas. Com foco nesse contexto, o objetivo geral neste artigo é investigar e descrever como a questão cultural pode influenciar a gestão de equipes de projetos globais. Trata-se de um estudo qualitativo e descritivo, realizado em uma empresa multinacional de grande porte do setor automobilístico. Os resultados obtidos nesta pesquisa demonstram que a questão cultural pode influenciar de forma tanto positiva quanto negativa a gestão de equipes de projetos globais e que os gerentes desse tipo de projetos têm de lidar com vários desafios gerenciais que exigem a adoção de determinadas formas de lidar com os impactos da cultura na gestão de suas equipes para minimizar os possíveis problemas existentes nesse contexto.