Threshold Density

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Threshold Density

 

the minimum darkening above the level of photographic fogging that is discernible on an exposed and developed photosensitive emulsion (photographic film or paper or cinematographic film). The threshold density is that point on the initial segment of the characteristic curve of the photographic material where the rate of change approaches zero.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The study found "Acanthaster densities within a network of small, no-take MPAs on reef flats in Fiji were ~263.4 times greater inside MPAs than in adjacent fished areas and ~262.5 times greater than the upper threshold density indicative of an outbreak."
The effective lifetimes for carriers in CuIn[Se.sub.2] and for GaInAs are illustrated in Figure 5 as a function of TDD, where a threshold density is defined as one which reduces the effective lifetime by a factor of 2.
We conclude that the tiger population in the eastern Wanda Mountains is in peril because the density of the prey species is below the threshold density necessary to support a tiger population.
Therefore, first-ordered Lognormal distribution is in fact the Log-Uniform distribution, with vanishing threshold density, [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII].
DBSCAN is trying to find clusters according to user-defined criteria for the threshold density and neighborhood radius (eps) and a number of points on the threshold eps-neighborhood (MinPts), and then find the object that satisfies the minimum MinPts with a given radius eps.
The proposed threshold density not only explains the circumstances in which these stars form but accounts for their rarity, the researchers say.
First, as patch size decreases, smaller, more discrete, less dense populations of reservoirs result, some of which may be lowered below the threshold density of some potentially zoonotic microbes (13).
We conclude that the TIN method provides a reasonable spatial approach for generating biomass estimates for a fishery unsuited to geostatistics, but we suggest further studies into uncertainty estimation and the selection of threshold density values.
Analysis of spatial distribution included determination of some threshold density of megalopae that signified the existence a "patch" (Natunewicz & Epifanio 2001).
To exclude in situ regrowth, the local carrying capacity must exceed a threshold value that increases with prey intrinsic growth rate and decreases with prey maximum uptake rate and threshold density. This slightly counterintuitive result comes about because nucleating a soliton solution requires the deepest trough in the wake to fall below the threshold for population regrowth.
We hypothesize that the risk of human infection results from an increase in the mass shedding of virus, after a population increase of infected voles over a threshold density. In this case, the prevalence of infection in rodents may rise some time before the outbreak occurs in humans.
If a plant is a strong competitor only above a certain threshold density (e.g., competition by allelopathic inhibition), or when it is present at high density and the other species is present at low density, then the dynamic behavior of the plant community may change.