Abstract: Olefin catalyst systems comprising silica supports are provided. For example, in one embodiment, the olefin polymerization catalyst system comprises a silica support, a catalyst precursor compound, and an activator. The silica support comprises a plurality of silica gel particles. Each particle comprises a rigid network of amorphous silica. The particles are spherical, single gel particles that have an average aspect ratio of about 1.2 or less, an average pore volume of from about 1.4 ml/g to about 3 ml/g, an average surface area from about 200 m2/g to about 950 m2/g, and a median particle size from about 4 ?m to about 100 ?m.

Abstract: An anchor for securing an object to a ground surface includes a lower portion having a screw thread extending from a bottom end to a top end thereof. A neck portion extends above the lower portion, is devoid of the screw thread, and terminates at a top end thereof at a first collar. A first loop of a flexible tether is fixed about the neck portion and confined thereto by the first collar and the screw thread. A second opposing loop of the tether is sized to accept the lower portion therethrough, including the thread, but not the first collar. With the tether fixed about the object and the bottom end of the lower portion traversing the second loop as the anchor is screwed into the ground surface, the loops are fixed about the neck portion with the tether secures the object to the ground surface.