POWER TRANSISTOR AND PHOTODIODE AS A SOLAR CELL DEVICE

Novel solar panel using BPW41N Photodiode have been developed. The panel produced current of 714μA at 6.17V and 375μA at 8.60V using type A and B respectively. The combination of type A and B produced current of 395μA at 13.80V which is a 5.45mW solar panel

THE IMPLICATION OF ANNEALING TEMPERATURE ON ZINC OXIDE (ZnO) BASED PEROVSKITE METHYLAMMONIUM LEAD BROMIDE (CH3NH3PbBr3) USING HYDROTHERMAL BATHING AND SPIN COATING DEPOSITION METHODS

The implication of annealing temperature on zinc oxide (ZnO) based perovskite, Methylammonium lead Bromide (CH3NH3PbBr3) using hydrothermal bathing and spin coating deposition methods was investigated; which is an advantageous thin film technique for deposition of large films at ambient or low temperature. The zinc oxide (ZnO) based perovskite, Methylammonium lead Bromide (CH3NH3PbBr3) were successfully deposited on the substrate (Glass slide) at a deposition time of 3 hours and were annealed at different temperatures of 100˚, 130˚, 160˚,190˚ and 200˚ degree Celsius respectively. The optical and morphological characterization of the zinc oxide nanoparticles and the perovskite material sequentially deposited on the substrate (Glass slides) annealed at different temperatures of 100˚, 130˚, 160˚, 190˚, 200˚ degree Celsius at deposition time of 3 hours were carried out using the UV – Visible Spectrophotometer and x- ray diffractometer respectively. It shows a transmittance between 1.42 a.u to 1.48 a.u of the thin film within the wavelength band of 350nm – 1500nm and a direct allowed band gap of 3.33 eV – 3.35 eV. UV- VIS spectroscopy revealed that the zinc oxide nanoparticles and the perovskite material sequentially deposited on the substrate (Glass slides) and annealed at temperatures of 130˚degree Celsius at deposition time of 3 hours has the highest efficiency because it absorbed readily at the least absorbance of 3.38 a.u and transmitted highly at a transmittance of 1.48 a.u within the visible region when compared to other annealing temperatures

Correlation between body mass index and waist circumference in Nigerian adults: implication as indicators of health status

Background. Anthropometric measures have been widely used for body weight classification in humans. Waist circumference has been advanced as a useful parameter for measuring adiposity. This study evaluated the correlation between body mass index (BMI) and waist circumference and examined their significance as indicators of health status in adults. Design and Methods. The subject included 489 healthy adults from Ota, Nigeria, aged between 20 and 75 years, grouped into early adulthood (20-39 years), middle adulthood (40-59 years) and advanced adulthood (60 years and above). Weight, height and abdominal circumference were measured. BMI was calculated as weight kg/height2 (m2) and World Health Organization cut-offs were used to categorize them into normal, underweight, overweight and obese. Results. Abnormal weight categories accounted for 60 % of the subjects (underweight 11 %, overweight 31%, and obese 18%). The waist circumference of overweight and obese categories were significantly (P<0.05) higher than the normal weight category. There was no significant difference between waist circumference of underweight and normal subjects. The correlation coefficient values of BMI with waist circumference (r=0.63), body weight (r=0.76) and height (r=-0.31) were significant (P<0.01) for the total subjects. Conclusions. The study indicates that waist circumference can serve as a positive indicator of overweight and obesity in the selected communities; however, it may not be used to determine underweight in adults. Regular BMI and waist circumference screening is recommended as an easy and effective means of assessing body weight and in the prevention of weight related diseases in adults