Drying or dehydration is a simple, low-cost way to preserve food that might otherwise be spoiled. Drying removes water and thus prevents fermentation or the growth of molds. In ancient times, fruits and vegetables were exposed to direct sun light for drying. However, in this method, there are several drawbacks. In the present work, a photovoltaic integrated solar dryer has been fabricated and tested for drying of fruits and vegetables. A d.c. fan powered by photovoltaic cell has been incorporated in the system to create forced air circulation in transferring thermal energy for drying without the use of grid connected power supplies. The dryer has been coupled to a solar air heater having a sun-tracking facility and blackened absorber for enhancing solar energy absorption. The system consists of a photovoltaic panel, solar air heater and a drying chamber with chimney. This system can be used for drying various agricultural products like fruits and vegetables. In this work, the experimental study has been conducted for the forced mode of drying for cabbage.

Abstract: Under the competitive and technology dependent global environment, modern technologies like Cloud Computing are keep boosting. Undoubtedly, enhancements of Cloud Computing are advancing their levels of productivity, profits and gaining market shares. As Cloud Computing already become popular throughout the glove and various peoples from different sectors are using Cloud Computing for different reasons therefore, it is now required to discuss insights of technology trends and developments for Cloud Computing in general. This paper mainly focuses on fundamental understanding of the different aspects of Cloud Computing such as an insight of Cloud Computing, different definitions, characteristics, deployment models, service models, key drivers and key challenges of Cloud Computing.

Background: Different authors have argued about the importance of telehealth in Sub-Sahara Africa. Mobile health applications have become the most popular type of the telehealth services under exploration. The success in deploying these mHealth applications hinge mainly on the mobile network coverage and the Internet capacity. In this research, the coverage and capacity of two main mobile network providers were analyzed with respect to the location of health centres and the population in the focus areas. Base stations managed by Telekom Networks Malawi PLC and Airtel Malawi Limited were analyzed by collecting secondary data from Malawi Communications Regulatory Authority and primary data was collected through the conducting of Internet speed tests at a sample of five health centres. The download and upload speeds and network latency data sets were analyzed using one-sample t-test method to find the deviation between recommended data speeds for different types of medical data and the means from network sample data that collected from sample health centres. Additional data on population and location of health centres was collected from National Statistical Office, Blantyre District Health Office. Results: By drawing network coverage maps using ArcGIS, results show that there is adequate network coverage for 2G, 3G and 4G. At significances of p-value<0.05, using the 95% confidence interval one sample t-test, and by observing the mean differences the analysis shows that both networks can handle remote sensing data, emails and transfer of bio-signals like electromyography, electrocardiogram and electroencephalogram at all five-sample health centres. Conclusion: The data analysis shows weakness in both download and upload speeds at all sample health centres in IP telephony and High Definition video conferencing data.