Correctness and precision of the results modeled with the discrete element analysis(DEA) is limited by the calculation scale,which is also determined by the characteristic length ratio L/R.

They are identified by means of the comparison of the fingerprints of normal alkane in them,the analyses of the relative concentration distributions of normal alkane in them,the character ratios of them,and the fuzzy cluster analysis of their fingerprint information.

The synchronizability measured by the eigenratio R can be effectively optimized by adjusting the only parameter,the number of active nodes M.

The simulation results show that the eigenratio will sharply decrease to its half when only 0.

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.

First, the original signals were decomposed into a number of IMFs (intrinsic mode functions): then, the ratios of amplitudes in the characteristic frequencies were defined as the characteristic amplitude ratios after the envelope spectra of some IMFs inc.