The title compound, K5[H2PtV9O28]·9H2O, containing the nona-vanado-platinate(IV) polyanion, was obtained by hydro-thermal reaction at pH = 4.2. The polyanion has approximate mm2 (C 2v ) symmetry. The two platinum-bound μ2-O atoms are protonated in the polyanion. The heteropolyanions form inversion-generated dimers, {[H2PtV9O28]2}(10-), held together by μ2-O-H⋯μ2-O and μ2-O-H⋯μ3-O hydrogen bonds...

I approximate the inverse Hessian (L′L)−1, where L is a Born modeling operator and L′ is the corresponding adjoint RTM operator, with non-stationary matching filters. These non-stationary filters can be seen as a low-rank approximation of the true inverse Hessian. For 3D least-squares imaging, I use these matching filters to precondition the inversion of prestack seismic data and observe a sign...

In the title compound, C12H7N3OS, the essentially planar thia-zole ring (r.m.s. deviation = 0.022 Å) forms dihedral angles of 84.88 (9) and 1.8 (3)° with the phenyl ring and the -C(CN)2 group (r.m.s. deviation = 0.003 Å), respectively. The mol-ecule has approximate local Cs symmetry. In the crystal, molecules are linked via C-H⋯N hydrogen bonds, forming chains propagating along [101]. The cryst...

An experimental study of the phase inversion behavior of liquid-liquid dispersion has been conducted in a spray extraction column for systems of toluene / water, n-hexane/water, CCl4/water, toluene /water + glycerol (25 % wt), toluene + CCl4 (25 % wt) / water and toluene / acetic acid (5 % wt)/water. The effects of physical properties, mass transfer and column geometry...

Several inverse problems exist in the atmospheric sciences that are computationally costly when using traditional gradient based methods. Unfortunately, many standard evolutionary algorithms do not perform well on these problems. This paper investigates why the temperature inversion problem is so difficult for heuristic search. We show that algorithms imposing smoothness constraints find more c...

In the title compound, C13H14N4O2, which has approximate mirror symmetry, the dihedral angles between the triazole ring and the cyclo-propane and pyridine rings are 87.1 (2) and 7.60 (9)°, respectively. In the crystal, inversion dimers linked by pairs of both C-H⋯N and C-H⋯O inter-actions generate R 2 (2)(6) and R 2 (2)(18) loops, respectively. Further C-H⋯N inter-actions form R 2 (2)(10) loops...

Individual ions and the solvating water mol-ecule constituting the structure of the title compound, [Fe(C8H13N)(C17H14P)]Cl·H2O, assemble into dimeric units located around crystallographic inversion centers via N-H⋯Cl and O-H⋯Cl hydrogen bonds. These discrete fragments are further inter-connected into chains by C-H⋯O inter-actions. The disubstituted ferrocene core in the {[1'-(di-phenyl-phosphi...

The multistage linear receiver of 1] was designed to approximate the decorrelat-ing detector and the MMSE detector without calculating the inverse of the cross-correlation matrix R of the spreading codes directly. However, it is complicated by the need to calculate a set of weights using a procedure involving the inverting of a large matrix. In this letter, a modiied structure is proposed to ac...

the purpose of this paper is to obtain necessary and suffcient conditionsfor existence approximate fixed point on geraghty-contraction. in this paper,denitions of approximate -pair fixed point for two maps tα , sα and theirdiameters are given in a metric space.