The dispersion and absorption are a pair of fundamental properties of optical medium. The use of the dispersive properties is often limited by the absorption.
吸收和色散性质是光学介质的一对基本性质，吸收性质往往会限制色散性质的利用。
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But for the influence of self phase modulation, the ISI limited distance of positive dispersion is much longer than that of negative dispersion.
Under the condition of producing qualified nickel concentrate, the increase of nickel recovery is limited in a bench test and commercial test by strengthening pulp dispersion and desliming.