isotope dilution-mass
41Datation par le couple rubidium-strontium — La datation par le couple rubidium strontium est une technique de datation de la formation d une roche basée sur la mesure de la présence du rubidium et de strontium dans la roche. Sommaire 1 Description de la technique 2 Voir aussi 2.1 Article… …
42Doubly labeled water — is water in which both the hydrogen and the oxygen have been partly or completely replaced for tracing purposes (i.e., labeled) with an uncommon isotope of these elements. In practice, for both practical and safety reasons, almost all recent… …
43Neutron poison — For information on biological effects of excessive ionizing radiation, see radiation poisoning. A neutron poison (also called a neutron absorber or a nuclear poison ) is a substance with a large neutron absorption cross section in applications,… …
44Nuclear poison — A nuclear poison, also called a neutron poison is a substance with a large neutron absorption cross section in applications, such as nuclear reactors, when absorbing neutrons is an undesirable effect. However neutron absorbing materials, also… …
45Business and Industry Review — ▪ 1999 Introduction Overview Annual Average Rates of Growth of Manufacturing Output, 1980 97, Table Pattern of Output, 1994 97, Table Index Numbers of Production, Employment, and Productivity in Manufacturing Industries, Table (For Annual… …
46Displacement chromatography — is a chromatography technique in which a sample is placed onto the head of the column[n 1] and is then displaced by a solute that is more strongly sorbed than the components of the original mixture. The result is that the components are resolved… …
47Reaction rate — Iron rusting a chemical reaction with a slow reaction rate. Wood …
48Débat sur l'énergie nucléaire — L’énergie nucléaire, qui représente en 2008 environ 13,5 % de la production mondiale d’électricité (soit 5,8 % de l’énergie primaire ou 1,9 % de l’énergie finale)[1], est un sujet de débat politique. La stratégie énergétique… …
49Activated carbon — Activated carbon, also called activated charcoal, activated coal or carbo activatus, is a form of carbon that has been processed to make it extremely porous and thus to have a very large surface area available for adsorption or chemical reactions …
50Liquid helium — Helium exists in liquid form only at very low temperatures. The boiling point and critical point depend on the isotope of the helium; see the table below for values. The density of liquid helium at its boiling point and 1 atm is approximately… …
