In view of the CO2/H2S corrosion of buried oil pipelines, the corrosion mechanisms of pipelines are investigated and some related influencing factors are analyzed. Taking Q235 steel for the buried oil pipelines of an oilfield as the case, the CO2/H2S corrosion behavior of Q235 steel is tested by using corrosion testing device and SEM; and the influence of different factors, such as temperature, Cl ion concentration, CO2 partial pressure, H2S partial pressure, and pH value, is studied in the simulated buried pipeline environment by using orthogonal experimental design method. On this basis, the corresponding CO2/H2S corrosion rate prediction model of pipelines is established by using Grey-Neural Network Theory, which has high prediction accuracy and credibility by an example of verification. According to the results, the protective measures are presented by adopting the Cathodic Protection Technology and Chemical Anti-corrosion Technology etc, which has certain guidance for the extension of pipeline-life and improving the economic benefits of pipelines.
The largely dispersive and different forms of data have resulted in more and more difficulties to the modern data processing. In order to unify the data form to help data operating and processing, the issue how to transform the various data forms into unified XML (Extensible Markup Language)format is discussed. In the computer network, the Metadata Model to the file data of different forms in the source data is applied, according to the predefining XML cyclostyle, with unified specification in the structure of format specification file and extracting data to make further processing, and finally outputting after transforming into XML code. The concrete strategy and process to realize the flow is designed: making it true that distracting data from TXT file and then transforming into XML code, completing such research work as design of data format specification file, development of data route-chosen tool, design and development of language analysis tool. The result showed: The technique of Metadata Model not only can process the source data structure form in terms of line that other kind of products can do, but also has the ability to process the non-line (character strings and
In this paper, the practical finite-time leaderless bipartite consensus problem for uncertain nonlinear multi-agent systems (MASs) with actuation failures is considered. With the unknown nonlinear dynamics, time-varying and unknown control gains, and undetectable actuation failures, the distributed finite-time controller design for such systems becomes more challenging. In response to this challenge, an adaptive faulttolerant distributed control protocol is proposed in this work, with which not only the neighborhood state error can converge to a sufficient small compact set within finite time, but also both the neighborhood error and the convergence time are tuned to the expected small range by adjusting the design parameters.
This paper briefly elaborates on microbial enhancement in recoverying ratio technology with its development,as well as its advantages.Combined with indoor and field experiment,this paper introduces the mechanism of this technology,pointing out that the next step should be to strengthen the selection and cultivation of excellent bacteria species,and to take a more detailed research on the viscous crude's Cold production with the use of microbe,as well as to establish a set of theoretical system and practical numerical simulation methods.
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