Design and Construction of 1KW (1000VA) Power Inverter

The purpose of this project is to design and construct a 1000Watts (1KW) 220 Volts Inverter at a frequency of 50Hz. This device is constructed with locally sourced components and materials of regulated standards. The basic principle of its operation is a simple conversion of 12V DC from a battery using integrated circuits and semiconductors at a frequency of 50Hz, to a 220V AC across the windings of a transformer. An additional power supply to the public power supply with the same power output is thus provided at an affordable price

Assessment of the Performance and Barriers to Small-Scale Fish Marketing in Dutsin-Ma Local Government Area, Katsina State, Nigeria

Abstract The importance of fishery products and its marketing has always been an important discours

measurement of radon concentration in selected houses in ibadan nigeria

Radon is a natural radioactive gas without colour or odour and tasteless. The World Health Organization (WHO) grouped radon as a human lung carcinogen. For this reason, there has been a lot of interest on the effects of radon exposure to people all over the world and Nigeria is no exception. The aim of this study is to investigate the radon concentration in selected houses in three local government areas of Ibadan. The indoor radon was measured in both mud and brick houses. Fifty houses were considered from the three Local government areas. A calibrated portable continuous radon monitor type (RAD7) manufactured by Durridge company was used for the measurement. A distance of 100 to 200 m was maintained between houses in all the locations. The living room was kept closed during the measurements. The mean radon concentration measured in Egbeda is 10.54 ±1.30 Bqm -3; Lagelu is 16.90 ± 6.31 Bqm -3 and Ona-Ara is 17.95 ± 1.72 Bqm -3. The mean value of the annual absorbed dose and annual effective dose for the locations in the three local government areas was 0.19 mSvy-1 and 0.48 mSvy-1 respectively. The radon concentration for location 10 in Ono-Ara local government exceeded the recommended limit. However, the overall average indoor radon concentration of the three local governments was found to be lower than the world average value of 40 Bqm -3. Hence, there is need for proper awareness about the danger of radon accumulation in dwelling places

Peanut contamination by Aspergillus flavus and aflatoxin B1 in granaries of villages and markets of Mali, West Africa

Peanut (Arachis hypogoea) is an important crop in Mali, West Africa. However, one of the main problems related to peanut production and commercialization is the detection of high levels of aflatoxin B1 in peanut-derived products for consumption. The objectives of this study were 1) to determine the rate of progress of Aspergillus flavus and aflatoxin B1 in granaries located in 26 villages and also in the granaries located in the corresponding 26 markets in Mali and 2) to correlate the progress of the A. flavus and aflatoxin B1 with environmental variables outside the peanut granaries. The results showed that peanuts stored and consumed in rural areas are highly contaminated by A. flavus and aflatoxin B1, with average rates of aflatoxin B1 significantly above the accepted international standards especially between the months of June and December. There was a moderate relationship (r2 = 0.58) between the aflatoxin B1 levels for two granary types, located at the villages and the corresponding granaries in the markets. The analysis of the aflatoxin B1 levels in the villages and its relation with the weather conditions outside the granaries revealed that for one village (Tiele), high relative air humidity was a contributing factor in the development of A. flavus and levels of the aflatoxin B1 in the granary. The results indicated that maximum aflatoxin B1 production occurs in presence of warm temperatures and relative humidity above 80%