The asymmetric unit of the title compound, C16H10N2O2, contains one half-mol-ecule, the complete mol-ecule being generated by twofold rotation symmetry. The plane of the pyrazine ring forms a dihedral angle of 64.87 (6)° with that of the benzene ring, and the planes of the two benzene rings are inclined to one another by 54.20 (6)°. The O atom deviates from the plane of the benzene ring by 0.15...

The title compound, C(25)H(22)O(5), was obtained by a dehydrogenative carbonyl-ation reaction. It crystallizes with one half-mol-ecule in the asymmetric unit. The mol-ecules have crystallographic C(2) symmetry and the two atoms of the carbonyl group are located on the rotation axis. The meth-oxy groups are coplanar with the benzene ring to which they are attached [C-C-O-C = 1.0 (6)°]. The two f...

The title compound, C6H6N6S, crystallized with two independent mol-ecules (A and B) in the asymmetric unit. The conformation of the two mol-ecules differs slightly. While the tetra-zole ring is inclined to the pyrim-idene ring by 5.48 (7) and 4.24 (7)° in mol-ecules A and B, respectively, the N-C-S-C torsion angles of the thio-methyl groups differ by ca 180°. In the crystal, the A and B mol-ecu...

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The asymmetric unit of the title salt C9H8N(+)·C12H9N4O7 (-), which exhibits anti-convulsant and hypnotic activities, comprises one anion and one cation inter-acting via an N-H⋯O hydrogen bond. In the anion, the six-membered rings are inclined each to other at 42.78 (9)°. The nitro groups in the 2,4-di-nitro-phenyl fragment attached to the aromatic ring in the para and ortho positions are twist...

This paper proposes a rendezvous protocol for cognitive radio ad hoc networks, RAC2E-gQS, which utilizes (1) the asynchronous and randomness properties of the RAC2E protocol, and (2) channel mapping protocol, based on a grid Quorum System (gQS), and taking into account channel heterogeneity and asymmetric channel views. We show that the combination of the RAC2E protocol with the grid-quorum bas...

Security plays an important role in many embedded systems. All security based algorithms are implemented in hardware or software, and on physical devices which interact with the systems and influenced by their environments. The attacker extracts, investigate and monitor these physical interactions and extracts side channel information which is used in cryptanalysis. This type of cryptanalysis i...

We explore possible applications of the Lattice-Boltzmann Method for the simulation of geophysical flows. This fluid solver, while successful in other fields, is still rarely used for geotechnical applications. We show how the standard method can be modified to represent freesurface realization of mudflows, debris flows, and in general any plastic flow, through the implementation of a Bingham c...

This article examines the classic problem of Stokes flow into a divided channel with, in contrast to previous literature, the divider barrier asymmetrically placed with respect to the moving, parallel channel walls. The boundary value problem is reduced to a Wiener–Hopf equation that is of matrix form and of a class for which no exact solution is known. An explicit approximate solution, in gene...