The holmium laser, which operates in a wavelength of 2.1 microns, is highly absorbed by water and has a shallow penetration depth of approximately 0.4 mm. As a pulsed mode laser, the Holmium reduces deeper thermal effects and charring which are more prevalent in Continues Wave lasers (e.g. Thulium, KTP).
In statistical theory, covariance is a measure of how much two random variables change together. In other words, covariance is a measure of the strength of the correlation between two random variables. Also, it can be considered as a generalization of the concept of variance of two random variables.
â¢ INVARIANCE (noun) The noun INVARIANCE has 2 senses: 1. the quality of being resistant to variation. 2. the nature of a quantity or property or function that remains unchanged when a given transformation is applied to it. Familiarity information: INVARIANCE used as a noun is rare.