order parameter


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order parameter

[′ȯrd·ər pə‚ram·əd·ər]
(statistical mechanics)
A measure of the degree of ordering of a system which has value zero above the temperature of a phase transition and acquires some nonzero value below the transition temperature.
References in periodicals archive ?
Such small values of the dimensionless coupling coefficient ([[xi].sup.2.sub.NI] [approximately equal to] [10.sup.-6]) would place a large weight on the terms from the bulk ordering potential, strongly encouraging uniaxial order at the bulk-minimizing value of the scalar order parameter.
It is further possible and common to define scalar order parameters, which are connected to the second-order alignment tensor.
In Sections 2.1 and 2.2, we define the order parameters and symmetry generators of the microscopic theory underlying HTSC and explain how the SO(5) symmetry arises from these structures.
The order parameter [PSI] is very small in this range, and higher order terms of [PSI] can be neglected.
The most active factor--human resources--is involved in this order parameter. This order parameter is mainly influenced by two factors including organizational experience and knowledge capital.
In photo-excitable NLC, another effective mechanism for order parameter change is Trans-Cis isomerism of azo-NLC or azo-molecule doped-NLC [71,73,76].
In this case, three time instants, t = 1.0, t = 1.5, and t = 2.0, are considered, while the heat source velocity and the fractional order parameter remain constant as v = 2.0 and [alpha] = 0.25, respectively.
Haken has proved that when [[lambda].sub.k] = c (c > 0), the largest initial order parameter will win and the network will then converge.
The parameters measured were the hyperfine splitting constants (2[T.sup.[parallel]] and 2[T.sup.[perpendicular to]]), allowing for calculation of the order parameter [23]:
The term [X.sub.i] is the current value of the order parameter, while [[alpha].sub.i] and [[beta].sub.i] are the maximum and minimum values of that order parameter, respectively.
One may try to estimate a spatially averaged order parameter and the corresponding effective critical temperature for a bundle consisting of a mixture of these two types of SWCNTs.