Examples of the absoluteness include the principle of invariance for velocity of light, the principle of special relativity, the principle of general relativity, eigenlength, eigentime, Minkowski four dimensional space-time.

From the similarity relations of radiative transfer theory,a parameter,namely characteristic length,was introduced on the basis of P_1 and P_3 satisfying approximatly the first-order similarity and third-order similarity relations.

Based on the researching of the infrared decoy countermeasure to the target characteristic length and energy equivalent centre,the countermeasure to the point target image radiation characteristics are analyzed.

By the relationship between the theoretical roughness and fractal parameters,the fractal parameters were introduced into the calculation of trait of a bearing center,and the influences of fractal dimension and characteristic length on the position of bearing center were investigated.

The feature length is to measure the degree in which micro-particle can be described by the model of classical mechanics.

The monolith silicon crystals are chosen as the diffraction elements of the monochromator, whose intrinsic width of the Bragg reflection determines the energy resolution and the photon output transmitted by the monochromator.

A new model established to correlate true hardness with composite hardness of thin films;

It is plastic deformation and eigen strength that unite two testing processes of triaxial compression and confining depressure, Weakness modulus, a new parameter just like Young s modulus, was found to describe the weakness of rock.