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AP World History: Modern was designed to help students develop a greater understanding of the evolution of global processes and contacts as well as interactions between different human societies. The course advances understanding through a combination of selective factual knowledge and appropriate analytical skills.
A D-ring used to secure cargo in a utility trailer (A) D-ring (shown in isometric view) (B) Weld-on pivot link; note the incorrect fillet weld call-out (bottom-right). The correct method of securing a weld-on pivot link is a [t weld] which consists of a perpendicular vee butt joint secured to the billet using a butt weld or fusion weld.
Artist's depiction of Haumea's ring system. A ring around Haumea, a dwarf planet and resonant Kuiper belt member, was revealed by a stellar occultation observed on 21 January 2017. This makes it the first trans-Neptunian object found to have a ring system. [32] [33] The ring has a radius of about 2,287 km, a width of ≈ 70 km and an opacity of ...
The welding of metal bellows is a microscopic welding process, typically performed under laboratory conditions at high magnification. Hydroformed bellows are produced by forcing a metal tube to expand under hydraulic pressure inside a bellows-shaped mold, and assume the convoluted shape of the mold.
Due in part to the growth of the oil industry, this symbol set was used during the 1990s in about 50% of the world's welding operations. [1] An ISO committee sought to establish a global standard during this decade. [1] In engineering drawings, each weld is conventionally identified by an arrow which points to the joint to be welded. The arrow ...
Closed wing designs include the annular wing (commonly known as the cylindrical or ring wing), the joined wing, the box wing, and spiroid tip devices. [ 1 ] Like many wingtip devices , the closed wing aims to reduce the wasteful effects associated with wingtip vortices which occur at the tips of conventional wings.
The Harkness table, Harkness method, or Harkness discussion is a teaching and learning method involving students seated in a large, oval configuration to discuss ideas in an encouraging, open-minded environment with only occasional or minimal teacher intervention.
In 1991 Clive Ponting wrote A Green History of the World: The Environment and the Collapse of Great Civilizations. His analysis did not begin with the Big Bang, but his chapter "Foundations of History" explored the influences of large-scale geological and astronomical forces over a broad time period.