Brus equation emission energy Δ"E" = "hc"/λ, where c is the speed of light). This is useful for calculating the radius of a quantum dot from experimentally determined parameters. The overall equation is "E", "m"*, and "m"* are unique for each nanocrystal composition. For example, with CdSe nanocrystals: Brus equation The Brus equation can be used to describe the emission energy of quantum dot semiconductor nanocrystals (such as CdSe nanocrystals) in terms of the band gap energy "E", Planck's constant "h", the radius of the quantum dot "r", as well as the effective mass of the excited electron "m"* and of the
Lewin's equation influence present events. Past events can only have a position in the historical causal chains whose interweavings create the present situation."Lewin referred to this concept as the principle of contemporaneity. Lewin's equation Lewin's equation, "B" = "f"("P", "E"), is a heuristic formula proposed by psychologist Kurt Lewin as an explanation of what determines behavior. The formula states that behavior is a function of the person and his or her environment: formula_1 Where formula_2 is behavior, formula_3 is Person, and formula_4 is the environment. This equation was first presented in Lewin's book, "Principles of Topological Psychology", published in 1936. The equation