2,646 research outputs found
Performance improvement of the LM device and its application to precise measurement of motion trajectories within a small range with a machining centre
In order to apply the LM device previously developed to precisely measuring small motion trajectories located on the different motion planes, three major improvements are successfully performed under the condition of completely maintaining the advantages of the device. These improvements include 1) development of a novel connection mechanism to smoothly attach the device to the spindle of a machining centre; 2) employment of a new data sampling method to achieve a high sampling frequency independent of the operating system of the control computer; and 3) proposal of a set-up method to conveniently install the device on the test machining centre with respect to different motion planes. Practical measurement experiment results with the improved device on a machining centre sufficiently demonstrate the effectiveness of the improvements and confirm several features including a very good response to small displacement close to the resolution of the device, high precision, repeatability and reliance. Moreover, based on the measurement results for a number of trajectories for a wide range of motion conditions, the error characteristics of small size motions are systematically discussed and the effect of the movement size and feed rate on the motion accuracy is verified for the machining centre tested
Tris(2-amino-1,3-thiazole-κN 3)(7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylato-κ3 O 2,O 3,O 7)cadmium(II) dihydrate
In the crystal structure of the title complex, [Cd(C8H8O5)(C3H4N2S)3]·2H2O, the CdII atom exhibits a slightly distorted octahedral CdO3N3 coordination, defined by the bridging O atom of the bicycloheptane unit, two O atoms from the carboxylate groups and by three N atoms from three 2-aminothiazole ligands. Uncoordinated lattice water molecules are also present in the crystal structure. N—H⋯O and O—H⋯O hydrogen-bonding interactions link the components into a three-dimensional structure
rac-7-Oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid–2-amino-1,3,4-thiadiazole–water (1/1/1)
The title compound, C8H10O5·C2H3N3S·H2O, was synthesized by the reaction of 2-amino-1,3,4-thiadiazole with norcantharidin. The crystal structure is stabilized by N—H⋯O, N—H⋯N, O—H⋯O and O—H⋯N hydrogen bonds. In addition, weak π–π interactions are observed between symmetry-related thiadiazole ring systems [centroid–centroid distance = 3.9110 (3) Å, interplanar spacing = 3.4845 Å]
8-Phenyl-10-oxa-8-azatricyclo[4.3.0.12,5]decane-7,9-dione
The reaction of aniline with norcantharidin produced the imide title compound, C14H13NO3, which shows no significant hydrogen bonds in the crystal structure. The dihedral angle between the phenyl and pyrrolidine rings is 48.48 (6)°
Bis(2-amino-1,3-benzothiazol-3-ium) bis(7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylato)cadmate hexahydrate
In the structure of the title complex, (C7H7N2S)2[Cd(C8H8O5)2]·6H2O, the CdII atom is located on an inversion center and is O,O′,O′′-chelated by two symmetry-related 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylate ligands in a distorted octahedral geometry. The 2-aminobenzothiazolium cation links with the Cd complex anion via N—H⋯O hydrogen bonding. Extensive O—H⋯O and N—H⋯O hydrogen bonds involving lattice water molecules occur in the crystal structure
exo-4-[(1H-Benzimidazol-2-yl)methyl]-10-oxa-4-azatricyclo[5.2.1.02,6]decane-3,5-dione
In the title compound, C16H15N3O3, the dihedral angle between the approximately planar benzimidazolyl group (r.m.s. deviation = 0.010 Å) and the pyrrolidine ring is 78.20 (6)°. The C—C—N bond angle of the bridging CH2 group is 112.14 (16)°. In the crystal, molecules are linked via N—H⋯N hydrogen bonds, forming infinite chains parallel to [101] and [10]
4-(3,5-Dioxo-10-oxa-4-azatricyclo[5.2.1.02,6]decan-4-yl)-10-oxa-4-azatricyclo[5.2.1.02,6]decane-3,5-dione
In the title compound, C16H16N2O6, the dihedral angle between the two pyrrolidine rings is 79.38 (14)°
Diaquabis(norfloxacinato)manganese(II) 2,2′-bipyridine solvate tetrahydrate
In the crystal structure of the title compound {systematic name: diaquabis[1-ethyl-6-fluoro-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylato]manganese(II) 2,2′-bipyridine solvate tetrahydrate}, [Mn(C16H17FN3O3)2(H2O)2]·C10H8N2·4H2O, the pyridone O atom and one carboxylate O atom of the two norfloxacin ligands are bound to the MnII ion, which is located on an inversion centre, and occupy equatorial positions, while two aqua O atoms lie in apical positions, resulting in a distorted octahedral geometry. The crystal packing is stabilized by N—H⋯O and O—H⋯O hydrogen-bonding interactions
Bis(2-amino-3H-benzothiazolium) bis(7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylato)cobaltate(II) hexahydrate
In the crystal structure of the title salt, (C7H7N2S)2[Co(C8H8O5)2]·6H2O, the heterocyclic N atom of the 2-aminobenzothiazole molecule is protonated. The CoII atom is situated on an inversion centre and exhibits a slightly distorted octahedral CoO6 coordination defined by the bridging O atoms of the bicycloheptane unit and four carboxylate O atoms of two symmetry-related and fully deprotonated ligands. The crystal packing is stabilized by N—H⋯O hydrogen bonds between the cations and anions and by O—H⋯O hydrogen bonds including the crystal water molecules
Poly[bis(1H-imidazole)(μ3-7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylato)cadmium(II)]
The title compound, [Cd(C8H8O5)(C3H4N2)2]n, was synthesized by the reaction of 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic anhydride, cadmium acetate and imidazole. The CdII atom is seven-coordinated in a distorted pentagonal-bipyramidal configuration by five O atoms from carboxylate groups of three 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylate ligands and two N atoms from two imidazole ligands. The crystal structure is stabilized by N—H⋯O and C—H⋯O hydrogen-bonding and C—H⋯π interactions
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