Critical Mass

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Related to subcritical: Subcritical flow
Radiation safety The minimum amount of material—mass of a particular radioisotope—required for it to reach ‘criticality’ and undergo a spontaneous fission chain reaction, releasing a lethal shower of neutron and gamma radiation
Research A popular term for the minimum number of persons working in related fields in a particular place, below which creative thinking and interaction may be suboptimal
References in periodicals archive ?
In the case of the melt viscosity being a factor limiting the subcritical bubble growth rate, Kagan [20] obtained the following expression for the pre-exponential factor:
In a letter to Obama dated Tuesday, the International Physicians for the Prevention of Nuclear War, the recipient of the 1985 Nobel Peace Prize, criticized the recent test, saying, "We want to express serious concern with the continued program of subcritical nuclear tests.
subcritical nuclear test could encourage Japanese politicians who are discussing Japan's right to exercise collective self-defense and renaming the country's Self-Defense Forces as national defense forces.
The non-separated pressure line (a) in figure 2 characterises flow about bladed disks at subcritical modes without flow separation processes.
As thermal reservoir temperature increases, COP of a heat pump decreases but not linearly as seen in subcritical operation.
In this case, when the heating is done from the bottom, subcritical and overstable convection may exist below the threshold of stationary convection.
The method is comprised of a step of obtaining a mixture by mixing at least one compound selected from the group of phthalonitrile, phthalonitrile derivative, isoindoline derivative and subphthalocyanine derivative, and a compound supplying copper or titanium with a solvent; and a step of holding the mixture at not less than a temperature where a subcritical state or a supercritical state of the solvent occurs to obtain the pigment by reacting the compounds.
2] transcritical cycle is that it is inherently less efficient than conventional HFC subcritical cycles at high ambient temperatures--due to the large difference in high- and low-side pressures.
The terms of the agreement for the wall-fired subcritical and supercritical generators were not disclosed.
Written for physicists and other research scientists in the nuclear energy field, these papers discuss HPPA5 programs and applications in terms of overall reliability, the development of spallation target and coolant technology and subcritical systems designs and simulations.
Our understanding of atherosclerosis has shifted from a focal disease whose hallmark is symptoms caused by a severe stenosis to a systemic disease characterized by endothelial dysfunction (ED) and plaque inflammation, with the potential for rupture and thrombosis mainly in those with subcritical stenosis.