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Conventional Low Energy Adaptive Clustering Hierarchy (LEACH) is a cluster based routing protocol for Wireless Sensor Networks (WSN), which is effective in enhancing lifetime of the nodes thereby increasing the entire network life. The protocol is based on functionalities such as spatially distributed cluster formation, random selection of cluster heads, processing of data locally in the clusters and transmission of aggregated data to the base station (BS). Further, the cluster-head (CH) is selected from the member nodes (MN) from each of the cluster based on remaining energy at the node. In literature, various versions of LEACH with enhanced network life are presented. In this paper, an Efficient LEACH protocol is proposed which includes selection of CH for every round of CH selection based on results on Voronoi tessellations from stochastic geometry and remainant energy in the member node devices. In proposed protocol, a novel method is used to choose the CHs wherein the CHs and member nodes (MNs) of clusters are distributed as two independent homogeneous spatial Poisson Point Processes (PPPs). Probability of selecting the CHs and threshold is derived using results from spatial statistics. The Proposed algorithm selects optimum number of CHs leading to reduction in total energy spent in the network compared to conventional LEACH and other such algorithms. The network life is measured by number of rounds. Monte-Carlo simulations are carried out for performance analysis of LEACH, TEEN and other PPP based protocols. Furthermore, total energy dissipated in the network for each round is fairly constant throughout the network life i.e. distribution of total energy consumption by the network is fairly uniform over the rounds.

The dimethylformamide solvated crystal structure of 3,3,6,6-tetramethyl-9-(3-chlorophenyl)-3,4,6,7,9,10-hexahydroacridine-1,8-dione (C26 H33 Cl N2 O3) crystallizes in the triclinic space group P -1with unit cell parameters: a=9.0814(4), b=11.5650(5), c=12.1354(5) Ǻ, a=91.806(3)º, β=96.450(3)º, g= 104.565(4)º and Z = 2. The crystal structure was solved by direct methods and refined by full-matrix least-squares procedures to a final R-value of 0.056 for 2691observed reflections. The central ring of the acridinedione system adopts a boat conformation and the two outer rings adopt sofa conformations. The solvent moiety (Dimethylformamide) is involved in the existence of intra and intermolecular C-H...O interactions., European Chemical Bulletin, Vol 3, No 6 (2014): European Chemical Bulletin

The title compound, 2-amino-4-(4-fluorophenyl)-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile (C21 H24 F N3 O3), crystallizes in the monoclinic space group C 2/c with unit cell parameters: a =31.342(3), b = 9.3481(9), c = 15.9051(11) Ǻ, β = 118.687(9)º, Z = 8. The crystal structure was solved by direct methods and refined by full-matrix least-squares procedures to a final R-value of 0.0588 for 2776 observed reflections. The fused cyclohexene and pyran rings adopt sofa and boat conformations, respectively. The four essentially planar atoms (C1/ C2/C5/C6) of pyran ring (maximum deviation = 0.0878Å for C2) form a dihedral angle of 87.85 (7)° with the benzene ring and is almost coplanar with the mean plane of the cyclohexene ring [dihedral angle = 7.23 (7)º]. In the crystal, molecules are connected into inversion dimers via pairs of N-H…N hydrogen bonds and these dimers are further linked by N-H…O hydrogen bonds into a two-dimensional network., European Chemical Bulletin, Vol 3, No 3 (2014): European Chemical Bulletin

The title compound 3,3,6,6-Tetramethyl-9-(3,4-dimethylphenyl)-3,4,6,7,9,10-hexahydroacridine-1,8- dione (C25 H31 N O2) crystallizes in the monoclinic space group P 21/c with unit cell parameters: a = 18.616(3), b = 9.9747(13), c = 11.8093(15) Ǻ, β = 91.89(13)º, Z = 4. The crystal structure was solved by direct methods and refined by full-matrix least-squares procedures to a final R-value of 0.075 for 3088 observed reflections. The central ring of the acridinedione system adopts a boat conformation. The four essentially planar atoms (C10/C11/C13/C14) of this ring [maximum deviations = 0.2047(3) Ǻ] forms dihedral angles of 87.32º(13) , with the benzene ring. The two outer rings of the acridinedione system adopt sofa conformations. The crystal packing is stabilized by intermolecular N-H…O interactions., European Chemical Bulletin, Vol 3, No 2 (2014): European Chemical Bulletin