DESIGN A TECHNICAL PROCESS OF THERMAL SPRAY APPLIED TO THE CRANKSHAFT REHABILITATION OF SHIP

The metal spraying was discovered very early. The important uses of this method are the processing and restoration of damaged machinery-parts that are corrosion or incorrect. Material which only needs a small amount compared to the whole of new parts that must be reproduced, used in the restoration. In some cases, restoration of the machinery-parts will have quality and the long-life higher than the new parts. This report presents a study that is about the design of combust-spaying and the heat treatment process

Crystal structure of 26-(4-methylphenyl)-8,11,14,17-tetraoxa-28-azatetracyclo[22.3.1.02,7.018,23]hexacosa-2,4,6,18(23),19,21,24(1),25,27-nonaene

The title compound, C30H29NO4, is a tetracyclic system containing a 4-arylpyridine fragment, two benzene rings and an aza-17-crown-5 ether moiety, in a bowl-like arrangement. The pyridine ring is inclined to the 4-methylphenyl ring by 26.64(6)°, and by 57.43(6) and 56.81(6)° to the benzene rings. The benzene rings are inclined to one another by 88.32(6)°. In the crystal, molecules are linked by pairs of C - H⋯N hydrogen bonds, forming inversion dimers with an R 2 2(14) ring motif. The dimers are linked via a number of C - H⋯π interactions, forming a three-dimensional architecture. © 2016

Crystal structure of 26-(4-methylphenyl)-8,11,14,17-tetraoxa-28-azatetracyclo[22.3.1.02,7.018,23]hexacosa-2,4,6,18(23),19,21,24(1),25,27-nonaene

The title compound, C30H29NO4, is a tetracyclic system containing a 4-arylpyridine fragment, two benzene rings and an aza-17-crown-5 ether moiety, in a bowl-like arrangement. The pyridine ring is inclined to the 4-methylphenyl ring by 26.64(6)°, and by 57.43(6) and 56.81(6)° to the benzene rings. The benzene rings are inclined to one another by 88.32(6)°. In the crystal, molecules are linked by pairs of C - H⋯N hydrogen bonds, forming inversion dimers with an R 2 2(14) ring motif. The dimers are linked via a number of C - H⋯π interactions, forming a three-dimensional architecture. © 2016

Influence of symmetry breaking in pentamers on Fano resonance and near-field energy localization

Optical Materials Express181409-141

Crystal structure of 22,24,25-trimethyl-8,11,14-trioxa-25-azatetracyclo[19.3.1.02,7.015,20]pentacosa-2,4,6,15(20),16,18-hexaen-23-one

The title compound, C24H29NO4, is the product of a Petrenko-Kritchenko condensation of 1,5-bis(2-formylphenoxy)-3-oxapentane, pentan-3-one and methylammonium acetate in ethanol. The molecule has mirror symmetry. The aza-14-crown-3 ether ring adopts a bowl conformation stabilized by a weak intramolecular C - H⋯O hydrogen bond. The conformation of the C - O - C - C - O - C - C - O - C polyether chain is t-g+-t-t-g--t (t = trans, 180°; g = gauche, ±60°). The dihedral angle between the benzene rings fused to the aza-14-crown-4-ether moiety is 72.68(4)°. The piperidinone ring adopts a chair conformation. The nitrogen atom has a trigonal-pyramidal geometry, the sum of the bond angles being 335.9°. In the crystal, the molecules are linked by weak C - H⋯O interactions, forming zigzag chains propagating along the [100] direction

Crystal structure of 22,24,25-trimethyl-8,11,14-trioxa-25-azatetracyclo[19.3.1.02,7.015,20]pentacosa-2,4,6,15(20),16,18-hexaen-23-one

The title compound, C24H29NO4, is the product of a Petrenko-Kritchenko condensation of 1,5-bis(2-formylphenoxy)-3-oxapentane, pentan-3-one and methylammonium acetate in ethanol. The molecule has mirror symmetry. The aza-14-crown-3 ether ring adopts a bowl conformation stabilized by a weak intramolecular C - H⋯O hydrogen bond. The conformation of the C - O - C - C - O - C - C - O - C polyether chain is t-g+-t-t-g--t (t = trans, 180°; g = gauche, ±60°). The dihedral angle between the benzene rings fused to the aza-14-crown-4-ether moiety is 72.68(4)°. The piperidinone ring adopts a chair conformation. The nitrogen atom has a trigonal-pyramidal geometry, the sum of the bond angles being 335.9°. In the crystal, the molecules are linked by weak C - H⋯O interactions, forming zigzag chains propagating along the [100] direction