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.
Some solitary bees also collect nest material from flowers such as Stachys bzantina (Lambsâ ear). Bees like blue, purple, violet and white flowers best, grown in large clumps in a sunny, sheltered spot. They do not like double headed varieties whose nectar and pollen has often been bred out.