Simulating lightning effects on carbon fiber composite shielded with carbon nanotube sheets using numerical methods.

The demand for lightweight aircraft structures has shifted from traditional metals like aluminum to composite materials such as carbon fiber reinforced polymers (CFRP) to achieve weight reduction. However, this transition has led to decreased lightning strike protection efficiency due to the dielectric nature of CFRP. To address this problem, two CFRP samples-one unprotected and the other shielded with carbon nanotube (CNT) sheets-were subjected to artificial lightning strike testing.

Evaluation of Glycemic Control and Predictors of Severe Illness and Death in Patients with Diabetes Hospitalized With COVID-19.

Objectives: To identify risk factors for severe disease and death among patients with diabetes and coronavirus disease 2019 (COVID-19) infection.

Methods: This retrospective cohort study conducted at three hospitals included 733 consecutive patients with DM admitted with confirmed COVID-19 (March 1 - December 31, 2020). Multivariable logistic regression was performed to identify predictors of severe disease and death.