moderating material
21Nuclear weapon design — The first nuclear weapons, though large, cumbersome and inefficient, provided the basic design building blocks of all future weapons. Here the Gadget device is prepared for the first nuclear test: Trinity. Nuclear weapon designs are physical,… …
22Glossary of environmental science — This is a glossary of environmental science.Environmental science is the study of interactions among physical, chemical, and biological components of the environment. Environmental science provides an integrated, quantitative, and… …
23Geography of Poland — Topography of Poland …
24Onboarding — A model of onboarding (adapted from Bauer Erdogan, 2011). Onboarding, also known as organizational socialization, refers to the mechanism through which new employees acquire the necessary knowledge, skills, and behaviors to become effective… …
25Aristotle the philosopher of nature — David Furley 1 THE TREATISES ON NATURE The subject matter of the present chapter is what Aristotle has to say about the natural world the subject that in classical Greek is most accurately rendered as ta physika. But of course this includes many… …
26international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …
27United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
28French literature — Introduction the body of written works in the French language produced within the geographic and political boundaries of France. The French language was one of the five major Romance languages to develop from Vulgar Latin as a result of the …
29Gun-type fission weapon — Gun type fission weapons are fission based nuclear weapons whose design assembles their fissile material into a supercritical mass by the use of the gun method: shooting one piece of sub critical material into another. Although this is sometimes… …
30Nuclear criticality safety — is a field of nuclear engineering dedicated to the prevention of nuclear and radiation accidents resulting from an inadvertent, self sustaining nuclear chain reaction.[1] Additionally, nuclear criticality safety is concerned with mitigating the… …
