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In nuclear weapon design, the pit is the core of an implosion nuclear weapon, consisting of fissile material and any neutron reflector or tamper bonded to it. Some weapons tested during the 1950s used pits made with uranium-235 alone, or as a composite with plutonium . [ 1 ]
Orchestra or Orchestra Pit: In productions where live music is required, such as ballet, folk-dance groups, opera, and musicals, the orchestra is positioned in front and below of the stage in a pit. The pit is usually a large opening ranging from 4–6 feet (1.2–1.8 m) wide, 20–40 feet (6.1–12.2 m) long and 6–10 feet (1.8–3.0 m) deep.
In the boosted design, the fusion fuel in gas form is pumped into the pit during arming. This will fuse into helium and release free neutrons soon after fission begins. [citation needed] The neutrons will start a large number of new chain reactions while the pit is still critical or nearly critical. Once the hollow pit is perfected, there is ...
Slurry wall design is undertaken based on bending moment and shear envelope obtained from the stress analysis. In the design of such underground walls, width of the unit is considered as one meter, and the wall is analyzed under plane strain condition. Since the length-to-width ratio of excavations is generally large, plane strain conditions ...
The pit can become very wet because urine mixes with feces in the pit and drainage might be limited. [citation needed] Additionally, groundwater or surface water can also get into the pit in the event of heavy rains or flooding. Sometimes households even discard greywater (from showering) into the same pit. [citation needed]
Mk VII design is the base for the most recent NuPIT (Nuclear-electric PIT). [ 2 ] The PIT has obtained relatively high performance in the laboratory environment, but it still requires additional advancements in switching technology and energy storage before becoming practical for high-power in-space applications, with the need for a nuclear ...
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The key characteristic of a pit latrine is the use of a pit, which infiltrates liquids into the ground and acts as a device for storage and very limited treatment. [7] Pit latrines are sometimes also referred to as "dry toilets". However, some pit latrines do use water for flushing and are therefore not a "dry toilet".