It proves : when the proportion of the liquefied petroleum gas to air is calculated on the basis of the wobbe index ranging from + 10 % to - 10 % .

The schemes No 4 and 5 are denied by calculating Wobbe index and combustion potential.

And the influences of the content of ethane,propane,butane,CO 2,N 2,and H 2 on Wobbe index and com.

According to wobbe number and combustion potential of the use area of gas appliance, hydrogen, methane and nitrogen, three single gases, can be used to mix the same quality gas in container as that of use area through calculation.

In this paper,we give the holomorphic automorphism groups and,compute the Bergman kernel functions represented by hypergeometric functions when the parameters are positive integers and the Bergman kernel functions in explicit formulas when one of the parameters is positive real number but the inverses of the other numbers are positive integers on the generalized Hua domains.

This paper extends the derivatives of binary sequences of reference [1] in two different ways and defines two different generalized derivatives of binary sequences.

In this paper, we gave the generalized derivative definition of mapping at infinitely space and took the derivative intead of the Frechet derivative of smooth mapping.

Then the periodicity of the generalized derivatives of periodic binary sequences is studied and some properties of the generalized derivatives are provided.

Aiming at that the reciprocating compressor vibration signals are nonlinear and non-stationary,multifractal spectrum and general dimension are applied to analyze compressor vibration signals and extract fault feature which can be identified.

The multi-fractals theory is applied for proposing the calculation formula of general dimension least square method.

The multifractal features are extracted from the vibration signals of different spots on reciprocating compressor using the improving arithmetic,the general dimension spectrum of bearing .