ABSTRACT We present the analysis of optical variability early, nitrogen-rich Wolf–Rayet (WR) star WR 7. The multisector Transiting Exoplanet Survey Satellite (TESS) light curves and high-resolution spectroscopic observations confirm multiperiodic that is modulated on time-scales years. detect a dominant period 2.6433 ± 0.0005 d in TESS sectors 33 34 addition to previously reported high-frequenc...

Environmental and electrical factors such as wind speed, air temperature switching frequency have significant influences on the operational reliability of hybrid modular multilevel converter (MMC), which is commonly used for power transmission. However, existing model MMC based statistics cannot accurately reflect impact these factors. In this paper, a new presented. The index coupled with its ...