A new technique based on the Artificial Neural Network (ANN) was developed for an automated recognition of solar filaments, dark elongated fea tures visible in the hydrogen H-alpha line full disk spectroheliograms. The ANN was trained on a single fragment containing the filament elements de picted on a local background and then tested on the other 54 image fragments depicting filaments on the b...

In the title compound, C(5)H(6)BrN(2) (+)·C(2)F(3)O(2) (-), the F atoms of the anion are disordered over two sets of sites, with occupancies of 0.59 (2):0.41 (2). In the crystal structure, the anions and cations are linked into a two-dimensional network parallel to (100) by N-H⋯O and C-H⋯O hydrogen bonds. Within this network, the N-H⋯O hydrogen bonds generate R(2) (2)(8) ring motifs.

We found that cyt c Y67H and Y67R variants represent a state which resembles the conformational intermediate state in cyt c with high peroxidase activity; and also the hydrogen bond network around Tyr67 is associated with the conformational transition of cyt c; these suggest that the hydrogen bond network around Tyr67 is essential in maintaining the cyt c functioning not only as an electron tra...

This work considers the problem of the optimal design of an hydrogen transmission network. This design problem includes the topology determination and the dimensioning problem. We define a solution method that simultaneously looks for the least cost topology of the network and for the optimal diameter of each pipe. These two problems were generally solved separately these last years. The applic...

•Examination of the cost benefit a European hydrogen network in net-zero emission scenarios•H2 reduces system costs by up to 3.4%, highest without power grid expansion•Between 64% and 69% uses retrofitted gas pipelines•Power expansion saves more than network, but strongest savings with both Many different combinations infrastructure could make Europe carbon neutral mid-century, not all solution...

The title compound, C(6)H(4)Cl(2)O(2), exhibits a two-dimensional supra-molecular hydrogen-bonded network and forms a three-dimensional network supra-molecular structure via hydrogen bonds and π-π stacking of benzene rings. The π-π inter-actions are between the benzene rings of centrosymmetrically related mol-ecules, with centroid-centroid distances of 3.7676 (13) and 3.7107 (13) Å.

In the title complex, [Co(CH(3)CN)(2)(H(2)O)(4)][CoCl(4)], the Co(II) ions are octa-hedrally coordinated in the cation, with trans-disposed acetonitrile ligands, and tetra-hedrally coordinated in the anion. An extensive network of O-H(water)⋯Cl hydrogen bonds between cations and anions connects the ions into a three-dimensional network. The Co-Cl distances correlate with the number of hydrogen ...

All the residues of the title compound, (C(2)H(5.5)NO(2))(2)[ReO(4)], are located in general crystallographic positions. The glycine mol-ecules have usual conformations [Rodrigues Matos Beja et al. (2006 ▶). Acta Cryst. C62, o71-o72] with the H atom of the carboxylate group half-occupied, thus bearing a formal half-positive charge per molecule. The perrhenate anion has nearly ideal tetra-hedral...