The three fundamental phases of matter are solid, liquid, and gas (vapour), but others are considered to exist, including crystalline, colloid, glassy, amorphous, and plasma phases.
The random packet dropouts, which are governed by a Bernoulli distributed white sequence, are considered to exist together for the estimator design of underlying switching neural networks.
Enzymes involved in drug and xenobiotic metabolism have been considered to exist in two groups: phase I and phase II enzymes.
Also, it can be observed that an approximately linear relation may be considered to exist between UCS and lime content between 0 and 2.5% lime content.
The hydrogen bonds are defined according to geometrical criterion, i. e., an HB is considered to exist if the O H ⋯ O distance is lower than 3.5 Å and the O H ⋯ O angle is lower than 30 ∘.
In this paper, a H-bond is considered to exist if the H---O distance is less than or equal to 2.0 Å and if the O-H---O angle is greater than 120°.
In Refs. [30, 31], for example, Bravais lattice types are considered to exist without any spatial relationships to the site symmetries of the motifs of the processed images that are more or less 2D periodic.
Spectroscopic evidence for the existence of humic pseudo-micelles has recently been reviewed by von Wandruszka.[28] The structures are considered to exist at all low HA concentrations in aqueous solution, although certain variations in composition must be anticipated.
In fact, it may be considered to exist 'in spite' of age, as the 'juvenile effect' documented for kauri lasted 200 (Jansen [1962]) or more (Grinsted and Wilson [1979]) years.
