Design, Modeling, and Performance Analysis of Parallel Flow Double Pass V-Groove Solar Air Collector for Preservation of Onion in University Students’ Cafeteria: Wolaita Sodo University

Author: Mulugeta Tadesse

Abstract: - Drying is the oldest mechanism to preserve crops, fruit, vegetables, and cooked food for long time usually by using direct sun drying as well as solar drying by using solar collectors. Onion and related vegetables are need drying to preserve them for the required time before its use to avoid its contact spoilage. In this project v-grooved parallel double pass solar collector selected for its high efficiency and high mass flow rate of hot dry air to dry 30 kg sample onions. For preservation of onion it is needed to evaporate 5.16 kg moisture from its total moisture content. The mass of dry air required to evaporate the given mass of moisture is 565.88 m³ dry-airs at a least 20 oC temperature difference. The overall efficiency of the selected type solar collector which required supplying the required amount of hot dry air is calculated based on the initial its model is 41.79%. The output temperature to the mass flow rate of working fluid, output temperature to flow contact area, and overall efficiency of the collector to mass flow rate of the working fluid is relation simulation made by using math lab software. Keywords: - Dehydration, Dry chamber, Onion Preservation, V-grooved solar collector, working fluid

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A Review on Cloud Data Security using Frequency Variation and Hard Logarithmic based Algorithm

Authors: Ankur Jain, Dr. L. K. Vishwamitra

Abstract- Offering real-time data security for Peta-bytes of data is important for Cloud Computing. A recent survey on cloud security states that the security of users’ data has the highest priority as well as concern. I have reviewed paper “Towards achieving Data Security with the Cloud Computing Adoption Framework” and found that this paper is using multilayered architecture for data security. There are three lyres in this paper : 1. firewall and access control; 2. identity management and intrusion prevention and 3. convergent encryption This paper has developed a framework known as Cloud Computing Adoption Framework (CCAF) which has been customized for securing cloud data. This paper explains the overview, rationale and components in the CCAF to protect data security. CCAF is illustrated by the system design based on the requirements and the implementation demonstrated by the CCAF multi-layered security. This paper has undertaken two sets of ethical-hacking experiments involved with penetration testing with 10,000 Trojans and viruses. The CCAF multi-layered security can block 9,919 viruses and Trojans which can be destroyed in seconds and the remaining ones can be quarantined or isolated. The experiments show although the percentage of blocking can decrease for continuous injection of viruses and Trojans, 97.43% of them can be quarantined. Our CCAF multi-layered security has an average of 20% better performance than the single-layered approach which could only block 7,438 viruses and Trojans.

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