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Phase-OTDR based on space difference of Rayleigh backscattering is proposed. The Rayleigh backscattering from different segments of the test fiber interfere by adjusting the path difference of the imbalance Michelson interferometer. According to the resemble polarization and intensity of two path light, amplitude, frequency of the acoustic signal at the different locations along the sensing fiber...
In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed,...
The characteristic and system composition and control principle of the sample heating process of Thermo-Mechanical simulator were analyzed, and the temperature measurement method of the heating sample with high current is given. The 0 voltage synchronous of the sample temperature control with minimum delay principle was shown. According the different sample dimensions and voltage levels of transformer...
It is well known that biomass serves as an important energy in the global energy configuration and biomass pyrolysis has become a convenient and useful technology for biomass utilization. In this view, it is essential to study the pyrolysis property of biomass. To understand the pyrolysis characteristic of biomass, pyrolysis experiments for eight different biomass samples were carried out on a pressured...
In spatial information sharing platform, an important use of the metadata is data searching. Traditional information sharing platform mostly search data just in the central node, which is inefficient. This paper presents a method which improves the efficiency of searching by mobilizing all the nodes of information sharing platform. That is, updating metadata of all the nodes through the synchronizing...
Aligning protein sequences using a score matrix has became a routine but valuable method in modern biological research. However, alignment in "Twilight Zone" is still a challenging issue. New score matrices such as Position Specific Score Matrix and structural context-based matrix have been issued to deal with it, whereas generalized matrices are still useful in pairwise alignment and/or...
Sequence alignment has been a most commonly used method in modern biological research. However, sequence alignment in "Twilight Zone" is still a challenging issue. Three protein class-specific matrices are constructed to investigate whether alignment in "Twilight Zone" can be improved by using class-specific matrices and gap penalties. The substitution pattern differences between...
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