In order to resume the “noise” information lost in the process of fractal data compression and obtain the invariance properties of fractal data compression, the paper provides a method to estimate and analyze parameters of the recovered data based on wavelet transform technique.

The method resolves effectively the existing problem in analyzing the recovered data with conventional fault diagnostic methods, and enlarges the application fields of fractal data compression technique.

Analysing the principle of the USB/RS232 converter and the traits of the output data from the A/D converter, a subprogram that can identify the character of the data automatically then recover the integrity of the signal is added.

Analysing the principle of the USB/RS232 converter and the traits of the output data from the A/D converter,a subprogram that can identify the character of the data automatically then recover the integrity of the signal is added.

In this algorithm,data is divided and retrieved through linear operations on the field F2.The file D which is |D| in length is divided into n pieces,each of size is(|D|+a)/r,r is the least amount of shares needed to retrieve D,a<|D|/r.

According to the reliability analysis,using m-n mechanisms under the fast recover mechanism can meet the need of reliability for large-scale storage system,if only n ≥m+2 and the time for data recovery computing can be ignored compared with the time for disk I/O.

Recovery data were satisfactory and the method detection limits were between 3 and 100 ng g-1, depending on the compound.

Comparison of the detection systems was performed by means of significance tests (t-tests), at the 5% level, applied to within-day measurements of standard solutions, to recovery data and to results from the analysis of wine and beer samples.

Accuracy, based on spiked recovery data, was 93-103% and precision, in terms of relative standard deviation on five replicates, ranged from 4 to 7%.

Its results demonstrate that total errors in recovery data are less than 1% of original data in time domain, 0.5% in frequency domain, when using these two methods together.

Two relations between the recovery data and the flow stress were found: 1.

A primary motif behind the repairing approaches is the principle of minimal change, which is the aspiration to keep the recovered data as faithful as possible to the original (inconsistent) database.

Two designs have been explored and analyzed, using data sampling systems with phase detection and decision logic to select either the most appropriate sample as the recovered data or the most appropriate phase as the recovered clock.

A distributed information network could serve as the dissemination medium for the recovered data.

Combining all the recovered data, the situation for each genus could be viewed as detailed below.

Determine the point in time that the recovered data will reflect ii.

A method of calculating the current reservoir pressure based on the rate of pressure build-up using the least square principle is introduced. With the help of computer, the arbitrariness of manual treatment of data is overcome and the accuracy of pressure calculation is improved. Calculations by computer for 340 wells show that the absolute error tally with that of Song I Method to the extent of 92. 5% when the absolute error is at|△P|≤2 bar atm.

Based on a lot of data of pressure build-up of gas fields in Sichuan,the types and characteristics of pressure build-up curve of fractured reservoirs are discussed in this paper.Through systematic study of the theory of gas filtration and well testing data in practice.the author points out that the flow coefficient of formation. premeability,skin effect and binomial equation of gas well can be estimated by using the conventional well test method after the type of pressure build-up curve has been determined and...

Based on a lot of data of pressure build-up of gas fields in Sichuan,the types and characteristics of pressure build-up curve of fractured reservoirs are discussed in this paper.Through systematic study of the theory of gas filtration and well testing data in practice.the author points out that the flow coefficient of formation. premeability,skin effect and binomial equation of gas well can be estimated by using the conventional well test method after the type of pressure build-up curve has been determined and the correct straight section on it has been judged.

This paper presents a method of analysing short buildup data after longtime production in a well inside a finite reservoir with any shapes. The basic theory of the method is different from both traditional Horner method and Modern type curve analysis method. It is derived from considering the actual flow conditions in the reservoir before shut-in. Therefore, ther esults of analysing short buildup data by this method coinside more closely with actual values. Its validity is verified through analysing short buildup...

This paper presents a method of analysing short buildup data after longtime production in a well inside a finite reservoir with any shapes. The basic theory of the method is different from both traditional Horner method and Modern type curve analysis method. It is derived from considering the actual flow conditions in the reservoir before shut-in. Therefore, ther esults of analysing short buildup data by this method coinside more closely with actual values. Its validity is verified through analysing short buildup data after longtime production in the finite reservoir in situ.