Effective workflow scheduling in cloud computing is still a challenging problem as incoming workflows to cloud console having variable task processing capacities and dependencies as they will arise from various heterogeneous resources. Ineffective scheduling of workflows to virtual resources in cloud environment leads to violations in service level agreements and high energy consumption, which impacts the quality of service of cloud provider. Many existing authors developed workflow scheduling algorithms addressing operational costs and makespan, but still, there is a provision to improve the scheduling process in cloud paradigm as it is an nondeterministic polynomial-hard problem. Therefore, in this research, a task-prioritized multiobjective workflow scheduling algorithm was developed by using cuckoo search algorithm to precisely map incoming workflows onto corresponding virtual resources. Extensive simulations were carried out on workflowsim using randomly generated workflows from simulator. For evaluating the efficacy of our proposed approach, we compared our proposed scheduling algorithm with existing approaches, i.e., Max–Min, first come first serve, minimum completion time, Min–Min, resource allocation security with efficient task scheduling in cloud computing-hybrid machine learning, and Round Robin. Our proposed approach is outperformed by minimizing energy consumption by 15% and reducing service level agreement violations by 22%.
We study the binding energy, root-mean-square radius and quadrupole deformation parameter for the synthesized superheavy element Z = 115, within the formalism of relativistic mean field theory. The calculation is dones for various isotopes of Z = 115 element, starting from A = 272 to A = 292. A systematic comparison between the binding energies and experimental data is made.The calculated binding energies are in good agreement with experimental result. The results show the prolate deformation for the ground state of these nuclei. The most stable isotope is found to be 282 115 nucleus (N = 167) in the isotopic chain. We have also studied Qα and Tα for the α-decay chains of 287,288 115. Keywords: Nuclear structure; relativistic mean field theory; nuclear density; α-decay half-live. 2217 Int. J. Mod. Phys. E 2011.20:2217-2228. Downloaded from www.worldscientific.com by UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL on 02/03/15. For personal use only. 2218 B. K. Sahu et al.spherical doubly magic nucleus heavier than 208 Pb arises in every advanced model of nuclear structure. 1 The elements up to Z = 118 have been synthesized till today with half-lives varying from a few minutes to milliseconds. 1,2 But theoretically predicted center of the island of stability could not be located. More microscopic theoretical calculations have predicted various regions of stability, namely Z = 120, N = 172 or 184 (see Refs. 3-5) and Z = 124 or 126, N = 184 (see .There is a need to design the new experiments to solve the outstanding problem of locating the precise island of stability for SHE. Measurements on the α-decays provide reliable information on nuclear structure such as ground state energies, half-lives, nuclear spins and parities, shell effects, nuclear deformation and shape co-existence. 9-17 Therefore as one of the most important decay channels for unstable nuclei, α-decay is extensively investigated both experimentally and theoretically.Both non-relativistic (e.g. Skyrme-Hartree-Fock) theory 18,19 and relativistic microscopic mean field formalism (RMF) 20,21 predict probable shell closures at Z = 114 and 120. Microscopic interaction for the existence of the heaviest element was estimated by Meitner and Frisch. 22 Myers and Swiatecki 23 estimated the fission barriers for wide range of nuclei and also far into the unknown region of SHE. The historical review on theoretical predictions and new experimental possibilities are given by Sobiczewski, Garrev and Kalinkin. 24 A considerable increase in nuclear stability was expected for the heaviest nuclei with N > 170 in the vicinity of the closed spherical shells, Z = 114 ( or possibly 120, 122 or 126) and N = 184, similar to the effect of the closed shells on the stability of the doubly magic 208 Pb (Z = 82, N = 126) (see . The change of shape from spherical to deformed (oblate/prolate) configuration in the α-decay process gives us valuable information about the nuclear structure properties. [25][26][27][28][29] The fusion-evaporation reaction of 243 Am + 48 Ca, leads to the forma...
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