Abstract: A face mask, comprising: a left half and a right half; one or more adhesive portions; and one or more release-coating portions; wherein the left half and right half are divided by a center axis; wherein the adhesive portions are strips located along an outer portion of the left half and the right half; wherein the face mask comprises a symmetrical folded configuration and an unfolded configuration; wherein the left half and the right half are configured to releasably engage one another in the symmetrical folded configuration; wherein the left half and the right half are configured to releasably engage a wearer's face in the unfolded configuration.

Abstract: Radiographic imaging system including: an x-ray transmission unit; an x-ray receiver unit; a plate made from a material opaque to x-rays and situated between the transmission unit and the receiver unit, the plate including at least four channels, each channel enabling a part of the x-rays emitted by the transmission unit to pass through the channel; and an image processing unit configured to determine the coordinates of the projected patterns and to calculate a position of the receiver unit from the coordinates of the projected patterns and from the coordinates of the channels.

Abstract: Radiographic imaging system including: an x-ray transmission unit; an x-ray receiver unit; a plate made from a material opaque to x-rays and situated between the transmission unit and the receiver unit, the plate including at least four channels, each channel enabling a part of the x-rays emitted by the transmission unit to pass through the channel; and an image processing unit configured to determine the coordinates of the projected patterns and to calculate a position of the receiver unit from the coordinates of the projected patterns and from the coordinates of the channels.

Abstract: There is provided an illumination rendering system and method for use by such a system. The system includes a system processor, a system memory, and an illumination rendering engine including a ray tracing unit stored in the system memory. The system processor is configured to execute the ray tracing unit to recognize a present classification of a light path traveling between a ray source and a ray receiver, and to identify a scattering type of a next scattering event corresponding to a ray on the light path. The system processor is also configured to execute the ray tracing unit to determine a next classification of the light path based on the present classification of the light path and the scattering type.

Abstract: There is provided an illumination rendering system and method for use by such a system. The system includes a system processor, a system memory, and an illumination rendering engine including a ray tracing unit stored in the system memory. The system processor is configured to execute the ray tracing unit to recognize a present classification of a light path traveling between a ray source and a ray receiver, and to identify a scattering type of a next scattering event corresponding to a ray on the light path. The system processor is also configured to execute the ray tracing unit to determine a next classification of the light path based on the present classification of the light path and the scattering type.

Abstract: A rotary sprinkler of the kind wherein an outlet nozzle having an integrally formed impeller element is adapted to be driven by a drive ball located within a drive ball enclosure wherein a first major axial portion of the side wall extends from the base wall of the enclosure to an intermediate peripheral position thereof and defines a first angle .alpha..sub.1 with respect to a normal to the base wall while a second minor axial portion of the side wall extends from the intermediate peripheral position to an edge rim of the enclosure and defines a second angle .alpha..sub.2 with respect to a normal to the base wall, .alpha..sub.2 being substantially greater than .alpha..sub.1, the impact element being spaced from the intermediate peripheral position by a distance which is not substantially less than one half the diameter of the drive ball.