A SEVEN-LEVEL INVERTER FOR PHOTO VOLTAIC SYSTEM

This paper proposes a new solar power generation system, which is composed of a dc/dc power converter and a new seven-level inverter. The dc/dc power converter integrates a dc–dc boost converter and a transformer to convert the output voltage of the solar cell array into two independent voltage sources with multiple relationships. This new seven-level inverter is configured using a capacitor selection circuit and a full-bridge power converter, connected in cascade. The capacitor selection circuit converts the two Output voltage sources of dc–dc power converter into a three-level dc voltage, and the full-bridge power converter further converts this three-level dc voltage into a seven-level ac voltage. In this way, the proposed solar power generation system generates a sinusoidal output current that is in phase with the utility voltage and is fed into the utility. The salient features of the proposed seven-level inverter are that only six power electronic switches are used, and only one power electronic switch is switched at high frequency at any time. A prototype is developed and tested to verify the performance of this proposed solar power generation system

Knowledge and awareness of cervical cancer prevention and HPV vaccination among medical and nursing students in a tertiary care hospital

Background: This study was done to assess the level of knowledge and awareness about cervical cancer and its prevention among medical and nursing students. Methods: This descriptive cross-sectional study was conducted during 2022 in a tertiary care hospital in Chennai. The study included 407 subjects; 224 medical students, and 183 nursing students and consent was obtained from each participant prior to the study. A questionnaire survey was used to assess their knowledge on cervical cancer and its prevention. Results: Out of the 407 participants, 95.5% of the medical students and 30.6% of the nursing students knew that HPV virus causes cervical cancer. Medical students had more knowledge on risk factors. 84.38% of medical students and 43.72% of nursing students were aware that vaccine is available for the prevention of cervical cancer. Overall nursing students had limited knowledge on cervical cancer and its prevention. 51.79% of the medical students and 27.87% of the nursing students acquired their knowledge about HPV vaccine through social media. The uptake of HPV vaccine was very low among both medical and nursing students. Conclusions: The results of our study demonstrate that there is a need for creating more awareness about cervical cancer and its prevention among medical and nursing students