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.
Digger bees are sometimes classified in the family Anthophoridae along with the carpenter bees. These hairy bees range from 5 to 25 mm in length and, like other members of this family, the females use scopae (stiff hairs) to carry pollen. Most species nest in the ground or in vertical banks, often in sandy soil. Some species waterproof their brood cells with secreted waxy or oily material.
Lesson 20: Different Types of Honey Bees. Here at Long Lane Honey Bee Farms, we are committed to help you be a successful beekeeper. David is a certified master beekeeper. We are offering 2 days of Queen Rearing classes June 27-28, and two Basic Beekeeping courses Oct 4 and Oct 25.