We develop numerical methods that efficiently compute image stress fields of defects in an elastic cylinder. These methods facilitate dislocation dynamics simulations of the plastic deformation of micro-pillars. Analytic expressions of the image stress have been found in the Fourier space, taking advantage of the translational and rotational symmetries of the cylinder. To facilitate numerical c...

The inter-nal C-Ge-C bond angle in the germacyclo-butane ring of the title compound, C(17)H(14)F(6)Ge or [Ge(C(3)H(6))(C(7)H(4)F(3))(2)], is 77.8 (3)°. The -CF(3) groups display rotational disorder [occupancies 0.604 (14):0.396 (14) and 0.410 (6):0.411 (6):0.179 (3)] and the germacyclo-butane ring also shows disorder [occupancies 0.604 (14):0.396 (14)].

The whole mol-ecule of the title compound, C27H26N2O2, is generated by twofold rotational symmetry, with the central C atom of the pentyl chain located on the twofold rotation axis. The compound crystallizes as a bis-zwitterion, and there are two intra-molecular N-H⋯O hydrogen bonds generating S(6) ring motifs. In the crystal, mol-ecules are linked by pairs of C-H⋯O hydrogen bonds, forming ribb...

A reduced retroversion angle of the humeral head may predispose to recurrent anterior shoulder dislocation and may also be a factor in persistent instability after soft-tissue repair. We performed rotational osteotomy of the proximal humerus in 20 patients with recurrent anterior shoulder dislocations (10 traumatic, 10 non-traumatic) and a decreased retroversion angle of the humeral head. The m...

Coupling mechanisms and detection thresholds are discussed for ring laser gyroscope measurement of seismic rotation, and simultaneous records f rom a ring laser and a standard EARSS seismograph 230 km from an ML 5.3 seismic event are compared. Rotation dominates tilt and strain in modulating the Sagnac frequency, and microseisms are not significant. Power spectral densities for the ring laser a...

Infrared absorption spectroscopy of few hundred H+(3) ions trapped in a 22-pole ion trap is presented using chemical probing as a sensitive detection technique down to the single ion level. By exciting selected overtone transitions of the (v(1)=0,v(2) (l)=3(1))<--(0,0(0)) vibrational band using an external cavity diode laser an accurate diagnostics measurement of the effective translational and...

The electric field applied perpendicularly to smectic layers breaks the rotational symmetry of the system. Consequently, the elastic energy associated with distortions induced by an edge dislocation diverges logarithmically with the size of the system. In freely suspended smectic films the dislocations in the absence of the electric field are located exactly in the middle of the film. The elect...

Considerations of rotational invariance in one-dimensionally modulated systems such as smectics-A, necessitate nonlinearities in the free energy. The presence of these nonlinearities is critical for determining the layer configurations around defects. We generalize our recent construction for finding exact minima of an approximate nonlinear free energy to the full, rotationally invariant smecti...

We present a detailed stability analysis of oneand two-ring solitary waves with central phase dislocation in self-focusing saturable and quadratic nonlinear media. Varying parameters, we demonstrate transitions between different filamentation scenarios. An analytical approach is developed for the study of filament dynamics after ring breakup. Approximate expressions for the angular separation r...

We report a case of a bilateral testicular dislocation with B1-1 pelvic-ring fracture according to the modified Tile AO classification, in a patient of 62 years. The mechanism of injury was impaction on the tank of a motorcycle. Symphyseal plate fixation using a Pfannenstiel approach was associated to bilateral orchidopexy through scrotal approach. The posterior pelvic ring was stabilized by il...