1-[Phen­yl(pyridin-2-yl­amino)­meth­yl]-2-naphthol

The title compound, C22H18N2O, was synthesized from naphthalen-2-ol, benzaldehyde and pyridin-2-amine. In the crystal, mol­ecules are linked into centrosymmetric R 2 2(16) dimers by pairs of O—H⋯N hydrogen bonds. The mol­ecular conformation is stabilized by an N—H⋯O hydrogen bond. The dihedral angle between the naphthylene ring system and the phenyl ring is 72.86 (12)°

Better synchronizability predicted by a new coupling method

In this paper, inspired by the idea that the hub nodes of a highly heterogeneous network are not only the bottlenecks, but also effective controllers in the network synchronizing process, we bring forward an asymmetrical coupling method where the coupling strength of each node depends on its neighbors' degrees. Compared with the uniform coupled method and the recently proposed Motter-Zhou-Kurth method, the synchronizability of scale-free networks can be remarkably enhanced by using the present coupled method.Comment: 6 pages, 6 figures; to be published in EPJ

3-Phenyl-2-(1H-tetra­zol-1-yl)propanoic acid monohydrate

In the title compound, C10H10N4O2·H2O, the dihedral angle between the tetra­zole and benzene rings is 63.24 (11)°. The crystal structure is stabilized by intra­molecular O—H⋯N and O—H⋯O hydrogen bonds

Theoretical investigation of the thermal performance of a novel solar loop-heat-pipe façade-based heat pump water heating system

The aim of the paper was to present a dedicated theoretical investigation into the thermal performance of a novel solar loop-heat-pipe façade based heat pump water heating system. This involved thermo-fluid analyses, computer numerical model development, the model running up, modelling result analyses and conclusion. An energy balance network was established on each part and the whole range of the system to address the associated energy conversion and transfer processes. On basis of this, a computer numerical model was developed and run up to predict the thermal performance of such a system at different system configurations, layouts and operational conditions. It was suggested that the loop heat pipes could be filled with either water, R134a, R22 or R600a; of which R600a is the favourite working fluid owing to its relatively larger heat transfer capacity and positive pressure in operation. Variations in the system configuration, i.e., glazing covers, heat exchangers, would lead to identifiable differences in the thermal performance of the system, represented by the thermal efficiency and COP. Furthermore, impact of the external operational parameters, i.e., solar radiation and ambient air temperature, to the system's thermal performance was also investigated. The research was based on an innovative loop-heat-pipe façade and came up with useful results reflecting the thermal performance of the combined system between the façade and heat pump. This would help promote development and market penetration of such an innovative solar heating technology, and thus contribute to achieving the global targets in energy saving and carbon emission reduction

3,3′-{1,1′-Methyl­enebis[naphthalene-2,1-diylbis(oxymethyl­ene)]}dibenzonitrile

The title compound, C37H26N2O2, was synthesized from 1,1′-methyl­enedinaphthalen-2-ol and 3-(bromo­methyl)­benzo­nitrile. The two naphthyl systems are almost perpendicular to each other [dihedral angle 83.3 (9)°] and the two cyano­benz­yloxy rings approximately parallel to each other [dihedral angle 15.5 (2)°]

4,4′-(Oxydimethyl­ene)dibenzonitrile

The title compound, C16H12N2O, was accidentally synthesized by the reaction of 4-(bromo­meth­yl)benzonitrile and penta­erythritol. The dihedral angle between the benzene rings is 57.39 (9)°. In the crystal structure, mol­ecules are linked by inter­molecular C—H⋯N hydrogen-bonding inter­actions to form chains running parallel to the b axis