Vortex dynamics and second magnetization peak in PrFeAsO0.60_{0.60}F0.12_{0.12} superconductor

We have studied the vortex dynamics in the PrFeAsO$_{0.60}$F$_{0.12}$ superconducting sample by dc magnetization and dynamic magnetization-relaxation rate $(Q)$ measurements. The field dependence of the superconducting irreversible magnetization $M_s$ reveals a second magnetization peak or fishtail effect. The large value of $Q$ is an indication of moderate vortex motion and relatively weak pinning energy. Data analysis based on the generalized inversion scheme suggests that the vortex dynamics can be described by the collective pinning model. The temperature dependence of the critical current is consistent with the pinning due to the spatial variation in the mean free path near a lattice defect ($\delta l$ pinning). The temperature and field dependence of $Q$ indicates a crossover from elastic to plastic vortex creep with increasing temperature and magnetic field. Finally, we have constructed the vortex phase diagram based on the present data.Comment: 11 pages, 8 Figures, Accepted for publication in Journal of Applied Physic

A New Proposed Cost Model for List Accessing Problem using Buffering

There are many existing well known cost models for the list accessing problem. The standard cost model developed by Sleator and Tarjan is most widely used. In this paper, we have made a comprehensive study of the existing cost models and proposed a new cost model for the list accessing problem. In our proposed cost model, for calculating the processing cost of request sequence using a singly linked list, we consider the access cost, matching cost and replacement cost. The cost of processing a request sequence is the sum of access cost, matching cost and replacement cost. We have proposed a novel method for processing the request sequence which does not consider the rearrangement of the list and uses the concept of buffering, matching, look ahead and flag bit.Comment: 05 Pages, 2 figure

Isolation and Characterization of Lectins from Ricinus communis

Lectins are proteins which are well distributed in nature. They are found in both plants and animals but plants are the richest source. On the surface of the cell lectins are attached with their sugar binding site. Lectins are found to be toxic, as it is poisonous it results in the death of cells both in vivo and in vitro. Leguminous plants serve as the main source of lectin, most of the lectins are derieved from seed, present in cytoplasm of the seed. Ricin is the toxic lectin which is derived from the castor bean plant Ricinus communis belong to the family of Euphorbiaceae. The toxicity of Ricin is bound with their two chain A and B chain. The A and B chains of ricin, more toxic to mammalian cells. Lectins exhibit a promising diagnostic and therapeutic approach for treating cancer. The study of this project encompasses the purification of ricin through affinity chromatography, characterization of ricin through haemagglutination assay and SDS-PAGE. The cytotoxicity on cancer cells is yet to be explored in order to showcase its anti-cancer property