No abstract

Long Covid is a term used for patients who have recovered from COVID-19 but exhibit persistent cognitive dysfunction, including mental confusion, difficulties in attention, impairment in executive functions and slow movements, among other common symptoms. A study was conducted with 65 patients who had a positive RT-PCR diagnosis and reported symptoms of cognitive impairment, such as memory loss and attention difficulties after recovery. The patients underwent neuropsychological evaluation and completed questionnaires on cognition, mood, and quality of life. During the cognitive screening, 71% of the patients showed alterations, with deficits in visual memory (69%), language (54%), visuospatial construction (49%), verbal episodic memory (37%), executive functions (36%), attentional abilities (34%), and premorbid intelligence (12%). It is important to highlight the need for treatments and further studies to understand the long-term side effects of this disease.

Diamond prospectors, who have been mining for more than 150 years in the Chapada Diamantina, are now trying, through initiatives such as the Andaraí prospectors cooperative, to formalize the exploitation of the diamond alluvial deposits in this region of Bahia. The sequence of operations for mining and processing these alluvial deposits in semi-mechanized garimpos, is generally determined by the geological conditions of the deposit and the availability of water resources. This research contributed to the characterization of secondary diamond deposits and to the understanding of how the mining of these deposits occurs in the Chapada Diamantina. It evidenced the characteristic profile of these alluvial deposits that present the diamondiferous gravels accumulated at the base of the sedimentary sequences, sterile matter formed predominantly by sand and clay, a configuration very similar to that observed in the deposits found in the tributaries of the Paraguaçu River, present in the study area. The main objective of this paper was to conduct a mineralogical and textural characterization of the alluvial deposits in the municipality of Andaraí in the vicinity of the Paraguaçu River and of the operational conditions of mining by the miners. The results point to a high sterile-mineral ratio for the exploitation of these deposits and detail the processes of mining and treatment of the diamond gravel for concentration of the Diamonds.

As exigências atuais do controle da produtividade, qualidade e eficiência dos equipamentos aliadas a implantação de um sistema que permita o gerenciamento de frota é de extrema importância nas minerações brasileiras, sobretudo quando o objetivo é a redução do custo com o carregamento e transporte de minérios, o maior vilão da lavra de mina. Todavia, às vezes não é tarefa simples decidir se o sistema está com baixa eficiência. Há inúmeras ferramentas paramétrica e não paramétricas que auxilia o gestor tomar esta decisão, entre as quais se podem citar: teste F, Análises Fatoriais, Teste t, Teste