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About Luiz
I am a journalist based in Vancouver, Canada. I write, shoot, edit and script.
Currently at the CBC (Canada). Formerly at The AP, The Globe and Mail, Globo TV (Brazil).
Work has appeared on The New York Times, Yahoo, USA Today, Al Jazeera etc.
Won a Canadian journalism award for work on the fentanyl crisis for The Globe and Mail (2017)
Services
Video Package (Web / Broadcast) Audio package (Radio / Podcast) Interview (Video / Broadcast)
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Topics
Politics Current Affairs Arts & Books
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Portfolio

Role of local anisotropy in hybrid stars

13 Oct 2024  |  epjc.epj.org
The study explores the impact of pressure anisotropies on the properties of hybrid stars using the Bower–Liang model. It highlights how anisotropies influence the maximum mass, central density, and radius of canonical stars, as well as the minimum neutron star mass with quarks in their core. The research aligns with standard constraints like the radius and tidal parameter of canonical stars and the mass and radius of the PSR J0740+6620 pulsar. It suggests that moderate anisotropies can meet these constraints, while extreme anisotropies might explain phenomena like black widow pulsars and mass-gap objects in events like GW190814. The role of anisotropies in neutron stars' moment of inertia is also examined.

A New Computational Algorithm for Assessing Overdispersion and Zero-Inflation in Machine Learning Count Models with Python

27 Mar 2024  |  MDPI
The article introduces a new computational algorithm for assessing overdispersion and zero-inflation in machine learning count models using Python. It provides a comprehensive overview of count data analysis, explores zero inflation, and introduces statistical tests like the likelihood ratio test and the Vuong test. The motivation behind the work is to create a Python implementation of the Vuong test, enhancing its accessibility and applicability in real-world scenarios. The article includes detailed explanations of count models, such as Poisson and negative binomial regression, and demonstrates the practicality of the approach with complete code and a case study using a dataset on parking violations by United Nations diplomats.

Spherically symmetric anisotropic strange stars

16 Feb 2024  |  epjc.epj.org
An extensive study on the presence of anisotropies in strange stars was conducted, utilizing three configurations of strange matter: unpaired, two-flavor super-conducting (2SC), and fully three-flavor super-conducting (CFL). The study calculated mass-radius relations, tidal parameters, moments of inertia, and surface curvatures for different anisotropy levels, comparing results with existing literature, including observations of massive pulsars and light compact objects.

The Task of Deconstruction

01 Oct 2023  |  drd.com.br
Adenor Leonardo Bacchi, known as Tite, faced significant criticism and personal attacks after his tenure as the coach of the Brazilian national football team, despite his previous successes with Corinthians. The article highlights the harsh and often unfair nature of public and media scrutiny in sports, drawing parallels to similar behaviors in other sectors of society. It also reflects on the broader implications of such criticism on personal and professional reputations.

Molecular Biology of Pediatric and Adult Ovarian Germ Cell Tumors: A Review

30 May 2023  |  MDPI
The review discusses the molecular biology of pediatric and adult ovarian germ cell tumors (OGCTs), including the etiopathogenesis, molecular landscape, and implications for treatment resistance. It highlights the rarity and complexity of OGCTs, the need for further research, and the importance of international collaborations and clinical trials. The review also covers the genetic, cytogenetic, and epigenetic alterations in OGCTs, the development of in vitro and in vivo models, and the molecular mechanisms associated with chemoresistance.

Influence of Bogie Maintenance and Retrofitting on Wheel Wear: Analysis Using Integer Programming and Multibody Simulation

16 May 2023  |  MDPI
The study investigates the impact of bogie maintenance and retrofitting on wheel wear in Brazilian railroads, aiming to enhance asset performance and reduce costs. It employs integer programming and multibody simulation to optimize maintenance strategies and retrofit designs, achieving a potential 40% reduction in wheel wear. The research highlights the importance of understanding wheel wear behavior and the benefits of improved wheel/rail contact, such as reduced maintenance costs and increased energy efficiency. The findings suggest that strategic maintenance and retrofitting can extend wheel life and improve the competitiveness of the railway system.

Nostalgia, Memories and Remembrances of Barrão

14 May 2023  |  drd.com.br
Sebastião Mendes Barros, a charismatic leader, served as Mayor of Governador Valadares and as a State Deputy for Minas Gerais. He played a significant role in the local football scene, leading various clubs and reviving the city's amateur football league. The article nostalgically recalls the vibrant football culture of the past and criticizes the current state of local football governance. Barros is remembered for his leadership, wisdom, and ability to unite people, leaving a lasting legacy in the community.

The World of the Pure and Infallible

07 May 2023  |  drd.com.br
The article discusses the historical legal issues involving Brazilian football players, including Alexi Stival, who were involved in a criminal case in Switzerland in 1987. It critiques the public and media's focus on these past events, suggesting that the players should be given a chance to redeem themselves. The piece also comments on the perceived influence of a 'fourth power' in Brazil, criticizing its impact on public discourse and decision-making. The author calls for a focus on more pressing national issues and a more compassionate approach to justice.

Pages: some blank; others torn

30 Apr 2023  |  drd.com.br
The article reflects on the history and contributions of various sports clubs and notable individuals in Governador Valadares, Brazil. It also touches on a recent reflection by over 450 religious figures in Aparecida, SP, concerning global crises, human brutality, and societal indifference. The narrative emphasizes the importance of recognizing and documenting the efforts and achievements of those involved in the local sports scene, amidst a backdrop of broader social and moral issues.

It hurt... and a lot!

23 Apr 2023  |  drd.com.br
Dadá Maravilha, a former striker and champion, expressed his disappointment with the current management of Clube Atlético Mineiro for not treating an idol properly. The article reflects on the broader issue of Brazilian football's lack of respect and recognition for its past heroes, with few exceptions. It suggests that Brazilian footballers who succeeded abroad have learned ethical and professional habits, leading to meritorious acts of solidarity. The article hopes for a resolution to the issue, with the Atlético management potentially planning new festivities to honor former players.
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