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The critical mass for lower-grade uranium depends strongly on the grade: with 45% 235 U, the bare-sphere critical mass is around 185 kilograms (408 lb); with 19.75% 235 U it is over 780 kilograms (1,720 lb); and with 15% 235 U, it is well over 1,350 kilograms (2,980 lb). In all of these cases, the use of a neutron reflector like beryllium can ...
In social dynamics, critical mass is a sufficient number of adopters of a new idea, technology or innovation in a social system so that the rate of adoption becomes self-sustaining and creates further growth. The point at which critical mass is achieved is sometimes referred to as a threshold within the threshold model of statistical modeling.
San Francisco Critical Mass, April 29, 2005. Critical Mass is a form of direct action in which people travel as a group on bicycles at a set location and time. The idea is for people to group together to make it safe for each other to ride bicycles through their streets, based on the old adage: there's safety in numbers.
Critical Mass: How One Thing Leads to Another, a non-fiction book by English chemist and physicist Philip Ball originally published in 2004, discusses the concept of a "physics of society". Ball discusses thinkers such as Thomas Hobbes , Lewis Mumford , Emyr Hughes, and Gottfried Achenwall who have attempted to apply (or argue against the use ...
Because 238 U absorbs fast neutrons, the critical mass needed to sustain a chain reaction increases as the 238 U content increases, reaching infinity at 94% 238 U (6% 235 U). [3] Concentrations lower than 6% 235 U cannot go fast critical, though they are usable in a nuclear reactor with a neutron moderator.
Critical Mass activists claimed it supported their claims that the police department has demonstrated a pattern of arresting participants in the rally on false charges. [34] Witnesses also disputed Pogan's account, saying that Long was the one to receive injuries, traffic was stopped for the rally, and that Pogan had simply scanned the group of ...
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Critical Mass Energy Project, an anti-nuclear umbrella group founded by Ralph Nader Critical Mass Journal, published in 1977 by the Critical Mass Energy Project; Critical Mass, a co-working center sponsored by the New England Venture Capital Association; Critical Mass, a robotics team of the Dwight-Englewood School in Englewood, New Jersey