Secondary stress. A secondary stress is any stress in the structure which is not a primary stress or peak stress. Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards.
Two groups of ground nesting bees commonly. found in Michigan are bumble bees and. burrower (andrenid) bees. Bumble bees are. easily recognized by their large, robust, hairy, black and yellow (sometimes orange) bodies. Bumble bees live in colonies of several. hundred individuals, but only the queens.
Drones (male bees) are the largest bees in the colony. They are generally present only during late spring and summer. The droneâs head is much larger than that of either the queen or worker, and its compound eyes meet at the top of its head. Drones have no stinger, pollen baskets, or wax glands.