In order to obtain the dynamic change law of reliability of redundant repairable system under the influence of common cause failure, a new algorithm combining improved GO method with dynamic bayesian network was proposed. Firstly, the GO diagram model was established according to the schematic diagram and flow chart of the system. Then, the GO model was converted into a DBN by using the conversion mapping rules of each operator and signal flow to the DBN. Finally, the model was solved by using DBN mature software and algorithms. After verification and comparison, it can be seen that this method is not only able to obtain the dynamic curve of system reliability and availability changing with time, but also to treat the influence of maintenance factors and common cause failures on the analysis results. In additional, that this method with the powerful ability of reverse reasoning, is able to obtain the weak links quickly and provide reference the fault diagnosis for the system

In order to study the erosion and wear of sand⁃bearing crude oil pipeline on elbow, the Euler⁃DPM bidirectional coupling model was established by using CFD analysis software.By changing the inlet flow rate, particle mass flow rate, particle diameter and other conditions, the flow field distribution and simulation were carried out with 45° elbow as the research object. The results show that the maximum wear rate increases exponentially with the increase of inlet jet velocity, and the velocity coefficient is 2;under the conditions of constant inlet flow rate and particle size, the maximum erosion wear rate increases linearly with the increase of discrete phase mass flow rate, and the slope is 1.633; the other variables are constant, the particle size is between 50～350 μm, and the maximum wear rate increases with the particle size. The maximum wear rate kept below 3×10－9 kg/(m2·s).When the particle diameter was larger than 350 μm, the maximum wear rate increased rapidly, and the maximum value was 12×10－9 kg/(m2·s).

With China's economic sustainable development, people's living standards improved, but the attendant environmental problems are increasingly prominent, the greenhouse effect is particularly prominent. Many scholars pay much attention to the relationship between China's carbon emissions and foreign direct investment and export trade. The effect of foreign direct investment and export trade on carbon emissions were studied through the panel data of 28 provincial units of 2000-2012. The results show that the total amount of foreign direct investment was a positive correlation with the carbon emissions in China. From the relative close degree, foreign direct investment on carbon emissions was greater than the total amount of export trade. 

With the development of our national economy, the scale of investment increased gradually at the business. The characteristics of the introduction of FDI scale of 19992013 in Liaoning province were summarized, to evaluate the carbon emissions from 1999 to 2013 in Liaoning province. Correlation between exploring the introduction of Liaoning province FDI scale and carbon emissions was studied, and the econometric methods was used. Through the ADF unit root test, cointegration test, the Grainger causality test, and generalized impulse response function method, the relationship between the identities of both was established, and a detailed analysis was made, the relevant reduction of Liaoning province carbon emission was put forward to propose according to the empirical conclusion.

Liaohe Oilfield TESHI pipeline for Thermal oil undertake a significant transportation task, to prevent corrosion is the primary means of protection for the pipeline. Cathode protection of buried pipelines is one of the best corrosion-proof methods. So far, the main way of evaluating and measuring cathode protection is potential measurement. Using specimens are able to be more convenient to measure the potential, the corrosion rate and protection level under cathode protection were obtained by the methods of polarization and potential decline measurement, which is beneficial to monitor and control real-time cathode protection. 

A simple control method of aiming at the control issue of water supply valves in the pipes of waterworks based on the HMI and PLC was represented. Under the circumstances that do not need install the servo mechanism and replace the valve, implementing the remote control of valve utilizing the ordinary AC single-phase motor as the power and designing a kind of detecting mechanism of cylinder number of valve based on the optical switch. It has the characteristics of low cost and high reliability，which has more extended and applied value on the frequently-adjusting valves of waterworks.