In the title compound, C21H17N2P, the dihedral angles between the 1,5-naphthyridine ring system (r.m.s. deviation = 0.005 Å) and the phenyl rings are 89.18 (8) and 77.39 (8)°. The phenyl rings are almost perpendicular, making a dihedral angle of 88.12 (8)°. The only possible inter-molecular inter-action is a very weak aromatic π-π stacking inter-action [centroid-centroid separation = 3.898 (2) Å].

In the title compound, C(9)H(9)ClN(4), the dihedral angle between the aromatic rings is 6.25 (9)°. The whole mol-ecule is approximately planar (r.m.s. deviation = 0.070 Å). In the crystal, π-π inter-actions between the centroids of the pyridazine rings [separation = 3.5904 (10) Å] occur.

In the title compound, C(6)H(4)Cl(2)OS, the acetyl group is almost coplanar with the thio-phene ring [dihedral angle = 4.01 (2)°]. In the crystal, short inter-molecular O⋯Cl contacts [2.9494 (14) and 3.1191 (14) Å] link the mol-ecules into infinite (100) sheets and aromatic π-π stacking [centroid-centroid separation = 3.5422 (10) Å] consolidates the packing.

The title Schiff base, C18H15NO, crystallizes in its zwitterionic form and an N-H⋯O hydrogen bond closes an S(6) ring. The dihedral angle between the aromatic ring systems is 36.91 (10)°. Weak aromatic π-π stacking occurs in the crystal [minimum centroid-centroid separation = 3.7771 (15) Å].

This paper presents the shadowing analysis of a body area network (BAN) diversity antenna based on the statistical measurements of the human walking motion. First, the dynamic characteristics of the armswing motion were measured using human subjects, and a statistical analysis was then carried out using the measured data to extract useful information for the analysis of a BAN diversity antenna....

Signal from fat is normally removed from MR images either by fat separation techniques that distinguish water from fat signal after the data has been received, or by fat suppression techniques that prevent the fat signal from being received. Most approaches to fat separation are variations on Dixon imaging. The primary downside to Dixon imaging is the requirement for multiple images with statio...

An experimental and computational investigation of the unsteady separation behaviour of two spheres in Mach-4 flow is carried out. The spherical bodies, initially contiguous, are released with negligible relative velocity and thereafter fly freely according to the aerodynamic forces experienced. In experiments performed in a supersonic Ludwieg tube, nylon spheres are initially suspended in the ...

In the title compound, C(16)H(18)N(2)O(6), the dihedral angle between the aromatic ring planes is 8.11 (6)°. One of the O atoms is disordered over two sites of equal occupancy. In the crystal structure, aromatic π-π stacking [centroid-to-centroid separation = 3.5503 (8) Å] helps to consolidate the packing.

In the title compound, C(20)H(14)ClP, the dihedral angle between the naphthyl rings is 81.77 (6)°. The crystal packing suggests weak π-π stacking inter-actions between the naphthyl rings in adjacent units [minimum ring centroid separation 3.7625 (13) Å].

In the title compound, C11H6FN3O5, the dihedral angle between the aromatic rings is 72.4 (3)°. The NO2 groups form dihedral angles of 40.8 (2) and 4.8 (2)°, respectively, with the attached pyridine and benzene rings. The crystal structure features π-π stacking between centrosymmetrically related pairs of pyridine rings [centroid-centroid separation = 3.800 (3) Å].