Cloud computing provides an economical and efficient solution for sharing group resource among cloud users. Privacy preservation and secure sharing of the data over un-trusted cloud is still a challenging issue, due to the frequent change of the membership. A secure multi owner data sharing technique is proposed for dynamic groups in the cloud. By us group signature and dynamic broadcast encryption techniques, any cloud user can anonymously share data with others. The storage overhead and encryption computation cost of our technique are independent with the number of users. In addition, to this the security of proposed technique with rigorous proofs, and demonstrate the efficiency of proposed system.
The collection and analysis of macrozoobenthos were done once in a month during two years i.e. February 2012 to January 2014. Total of 9 species of meiozoobenthos were observed in Kunghada Bandh lake and Chamorshi Lake belonging from phylum Rotifera and Arthropoda (cladocera, copepods, ostracods). It is concluded that both the Lakes are rich in diversity of meioozoobenthos. Kunghad Bandh lake is shows slightly more quantity of meiozoobenthos as compare to Chamorshi Lake, due to fair quality of water.
Coal Fly Ash (CFA) is a waste material of the Hydrothermal Thermal Industrial field. Amorphous silica, commonly used as Coal Fly ash, was extracted from coal. The pure silica with a high specific surface area, high melting point and high porosity can be obtained from Fly ash. These properties make the ash a valuable raw material for many fields. The study of synthesized of zeolite from Coal Fly ash. The Coal Fly ash was calcined at temperature 800oC for eight hours using digital muffle furnace to produce pure silica. The Gel composition of synthesized of zeolite from Coal Fly ash was 4.6 Na2O:6 SiO2:Al2O3: 144H2O.The gel solution was mixed at room temperature for 24 hours using stainless still autoclave. The characterization of zeolite like X-Ray Diffraction (XRD), FTIR, SEM etc.
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