Abstract: The invention pertains to a method for enhancing the determination, from a seismic image of at least a portion of a seismic horizon in a three-dimensional domain. The method comprises: receiving the seismic image; receiving a plurality of related control points; defining pseudo-rectangles; for each pseudo-rectangle applying a diffeomorphic transformation F: defining a new domain; transforming points of the seismic image; transforming said pseudo-rectangle into a corresponding rectangle; applying a horizon reconstruction algorithm to the transformed points, to determine a part of a transformed horizon, the reconstruction comprising solving a Poisson equation; and computing a part of the horizon, said computing comprising applying an inverse diffeomorphic transformation F?1 to the determined part of a transformed horizon.

Abstract: The invention pertains to a method for enhancing the determination, from a seismic image of at least a portion of a seismic horizon in a three-dimensional domain. The method comprises: receiving the seismic image; receiving a plurality of related control points; defining pseudo-rectangles; for each pseudo-rectangle applying a diffeomorphic transformation F: defining a new domain; transforming points of the seismic image; transforming said pseudo-rectangle into a corresponding rectangle; applying a horizon reconstruction algorithm to the transformed points, to determine a part of a transformed horizon, the reconstruction comprising solving a Poisson equation; and computing a part of the horizon, said computing comprising applying an inverse diffeomorphic transformation F?1 to the determined part of a transformed horizon.

Abstract: A condom for use by a female user has a flexible tube for insertion into the vagina, the tube having a sealed end and an open end, a shield sealingly attached to or integrally formed with the open end, and an adhesive applied to a portion of the shield for detachably attaching the condom to the female user. The shield has a number of regions which together form a continuous, seamless surface surrounding the open end of the tube. These regions include a first region for covering the pubic region and part of the lower abdomen, a second region for substantially covering the right groin, a third region for substantially covering the left groin, a fourth region for covering part of the right inner thigh, a fifth region for covering part of the left inner thigh, and a sixth region for covering the perineum and the anus. One or more semi-rigid ring may be deployed along the tube. The adhesive is a perspiration resistant, hypo-allergenic skin glue.

Abstract: A hygienic device for protecting the genital, urinary and rectal areas of human beings during bathing and swimming activities as disclosed. The device is intended for protecting said areas against irritation, inflammation or infection. It is made of a flexible, thermoplastic and impermeable material and shaped to closely adhere to said areas by all its edges.

Abstract: A drive mechanism is disclosed for driving the chain of a bicycle, motorbike or the like, including a sprocket gear adapted for rotatable connection at its center with the vehicle frame, the sprocket gear periphery including a pair of diametrically opposed portions of corresponding cycloid configuration, and a pair of foot pedal crank arms connected with, and extending diametrically outwardly from the center of, the sprocket gear, the crank arms being angularly advanced, relative to the minor axis of the sprocket gear, in the power supplying direction of rotation by an angle of from about 30.degree. to about 40.degree.. In one modification, the cycloid portions are spaced in the direction of the minor axis of the sprocket gear, the adjacent ends of the cycloid surfaces being joined by tangentially arranged arcs of a circle the diameter of which equals the length of the major axis of the cycloid.