PURPOSE The human male urethra has great capacity to extend under traction. This extensibility is the principle of some surgical techniques used to overcome urethral defects and for penile lengthening. However, to our knowledge safe limits of urethral extensibility in reconstructive surgery have not been yet established by a morphological study. To this end we measured fresh human cadaveric ure...

We measured thresholds for detecting the direction of curvature in slightly bent stimuli such as arcs and sinusoidal lines, and the direction of bend in chevrons and trapezoids in an initial experiment. Stimulus length varied over a wide range from 8.3 to 267 min arc. For sufficiently long stimuli, the angle between the stimulus and its chord was constant at 0.2-0.3 deg at detection threshold. ...

Deformation zones along the down trajectories of skelps forming using mill TESA10-50 (Pipe Electrical Welding Unit) were considered. For pipes with 50×1.5 mm diameter, strained conditions for identified different options length as-formed skelp initial position upward gradient within range H = 0÷50 mm. It was determined that increase in trajectory contributed to decrease longitudinal strain valu...

Numerical homogenization is an excellent tool for the quick simplification of complex structures with a model that much simpler and, at same time, accurately reflects mechanical behavior original model. Corrugated cardboard modeling, all geometrical nuances preserved, complicated and time-consuming process. The transfer full 3D corrugated board composed two flat layers middle layer to one only,...

In this paper we prove two theorems on initial data for general relativity. The results present “rigidity phenomena” for the extrinsic curvature, caused by the negativity of the scalar curvature. More precisely, Theorem 1 states that in the case of non-vacuum initial data if the metric has everywhere non-positive scalar curvature then the extrinsic curvature cannot be compactly supported. Theor...