Abstract: A solar-powered vehicle with regenerative and mechanical braking includes a chassis or frame, a seat mounted to the frame, a rear axle rotatably supported on the frame, spaced apart left and right rear wheels mounted on the rear axle, and at least one front wheel mounted on the frame. The vehicle includes a selectively engageable regenerative braking system and a selectively engageable mechanical braking system. A lever for engaging the braking systems has three positions, wherein at a first position a reed switch on the lever engages a magnetic source, disabling the regenerative braking system. At a second position, the reed switch disengages the magnetic source, enabling the regenerative braking system. At a third position of the lever, the mechanical braking system is engaged.

Abstract: An apparatus and method for protecting wellheads of a fixed-leg drilling and production platform which provide an alternative from the shutting in of producing wells as currently required. The apparatus provides a structural barrier for the production process systems of the platform, shielding such systems from heavy objects which may be dropped in the course of rig mobilization and skidding procedures. A method of installing an embodiment of the apparatus allows the barrier to be installed without shutting in the production wells.

Abstract: A method and apparatus for sealing well bores is disclosed. The apparatus comprises plates which initially have a width smaller than the diameter of the well bore to be sealed or plugged. The plates are fabricated from a mineral substance which has the property of swelling into an expanded state upon contact with and absorption of a liquid. The apparatus further comprises means for placing the plate within the well bore. Among the mineral substances which may be utilized for forming the plate are members of the group of clay minerals known as smectites, including sodium montmorillonite, calcium montmorillonite, sodium bentonite, and calcium bentonite. A method sealing a well bore with the apparatus is disclosed.