horizon

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horizon

 [hŏ-ri´zon]
a specific anatomic stage of embryonic development, of which 23 have been defined, beginning with the unicellular zygote (fertilized egg) and ending 7 to 9 weeks later with the beginning of the fetal stage.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

horizon

any layer of soil that is distinguishable when soil is examined in vertical sections.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
This shows that [[??].sub.tot] remains positive with increasing value of t which confirms the validity of GSLT at apparent horizon with Bekenstein entropy.
According to the assumptions above, the boundary maybe decomposed into future (+) and past (-) apparent horizon components [partial derivative]M = [[partial derivative].sub.+]M [union] [[partial derivative].sub.-] M.
(i) Bekenstein entropy: the Bekenstein entropy and Hawking temperature of the apparent horizon are given by (8[pi] = G = 1)
Cai, "Thermodynamical properties of apparent horizon in warped DGP braneworld," Nuclear Physics B, vol.
In this section, we study the laws of thermodynamics in the context of f(G, T) gravity at the apparent horizon of FRW universe model.
We note that, based on spacetime thermodynamics, a proper causal boundary of the classical spacetime is its apparent horizon [45, 46], meaning that the metric fluctuations are bounded by [R.sub.H] and also that thermodynamics laws are satisfied on this boundary [47, 48].
Moreover, the volume (V) and the area (A) of the apparent horizon of an n-sphere with radius [r.sub.A] satisfy [34]
In Section 2, we reviewed the cosmical apparent horizon and derived the holographic-style dynamical equations in the EBI theory.
For an energy-momentum source with [T.sup.b.sub.a] = diag(-[rho], p, p, p), the amount of energy crossing the apparent horizon is evaluated as [8]
Due to the effect of rainbow gravity, the deformed Friedmann equation (44) becomes susceptible when the apparent horizon approaches the order of Planck scale.
Now we investigate the thermodynamic behavior of the nonminimal f(T) gravity on the apparent horizon. In the flat FRW universe, the radius [[??].sub.A] of the dynamical apparent horizon is given by [22]
From this equation we can define the apparent horizon as follows:

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