Abstract: Systems and techniques for mitigating spectral excursions in a passive optical network (PON) are described herein. A spectral excursion may be determined in the PON. The spectral excursion may indicate a laser transmission output on the PON at a wavelength that is outside a designated wavelength range. A duration may be identified for the spectral excursion. A first preamble offset may be generated using the duration of the spectral excursion. A round trip delay for the PON and a local time of day may be determined. The first preamble offset, the round trip delay, and the local time of day may be transmitted to an optical line terminal (OLT).

Abstract: A well abandonment apparatus is described. The apparatus can be run on drillstring and does not require the use of explosives to sever the casing. The apparatus includes both a cutting device to perforate and sever the casing and a sealing device to prevent well fluids from reaching the surface while the well abandonment operation is proceeding.

Abstract: A well abandonment apparatus is described. The apparatus can be run on drillstring and does not require the use of explosives to sever the casing. The apparatus includes both a cutting device to perforate and sever the casing and a sealing device to prevent well fluids from reaching the surface while the well abandonment operation is proceeding.

Abstract: A child's puzzle toy has several discrete puzzle panels of progressively increasing difficulty. Each panel bears, on a first surface, a segment of a picture. The panels are assembled for joining the segments into continuous pictures. Each panel has at least one cavity and the puzzle further includes a corresponding puzzle piece of size and shape to be received snugly into the cavity.