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.
The male cone (microstrobilus or pollen cone) is structurally similar across all conifers, differing only in small ways (mostly in scale arrangement) from species to species. Extending out from a central axis are microsporophylls (modified leaves). pine cone covered in ice after an ice storm. Male cones of a pine A classic example of a Lebanese Cedar cone. Immature female pine cone Pollen cone of a Japanese Larch Pineapple gall on Sitka Spruce caused by Adelges abietis.