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The reliability-centered maintenance (RCM) analysis method and the RCM implementation process for dynamic equipment in petrochemical ammonia-related systems were introduced. The operation situation, key roles, and potential risks were clarified through data analysis and system screening in ammonia dynamic equipment, and FMEA was used to analyze the failure mode. Then the risk of each failure mode was managed hierarchically, a suitable risk assessment standard and risk matrix were developed for the enterprise, and a suitable maintenance strategy was formulated for the risk level of each failure mode.

The hitting time, which refers to the time required to find the marked element in the search algorithm, is one of the most interesting properties of quantum walk. In this paper we briefly analyze the hitting time on a finite 2D lattice in the classical case, focusing on the quantum version of the hitting time and give specific expressions for each. It is well known that the quantum hitting time has the same order as the square of the classical case, and our work also happens to verify this particular property. [ABSTRACT FROM AUTHOR]

In this paper, we analyze quantum walks on cycles with an absorbing wall. We set the absorbing wall on cycles with N vertices (where N is an even number), and divide | φ (t) 〉 into two parts, L (t) and R (t). Due to the periodicity of the cycles, the condition L (M + N) = L (M) (or R (M + N) = R (M)) is applied to L (t) and R (t) , then the transmission probability P M and reflection probability Q M at the absorbing wall n = M (M = N 2) at time t are obtained. Furthermore, we show that over time, the absorbing wall absorbs less and less. [ABSTRACT FROM AUTHOR]

Cholera is a waterborne disease caused by the bacterium Vibrio cholerae. Laboratory findings suggested that passage through the human host transiently increased the infection potential of the bacteria by creating a hyperinfectious bacterial state, which may contribute to the epidemic spread of cholera. In this paper, we are concerned with the global asymptotic behavior of an infection age-space structured cholera model with multiple transmission pathways, hyperinfectious and hypoinfectious vibrios, imperfect vaccination, and distinct dispersal rates for humans in a general continuous bounded domain under Neumann boundary condition. The mathematical challenges stem from the following facts: (i) the model is partially degenerate, and the solution is not compact; (ii) the imperfect vaccination is incorporated into an infection age-space structured model with multiple transmission pathways. By analyzing the corresponding characteristic equations and constructing suitable Lyapunov functionals, the basic reproduction number is determined as a threshold to predict whether the infection will persist. Numerical simulations support our theoretical results and suggest that compared with increasing the vaccination rate of susceptible humans, enhancing vaccine efficacy is more conducive to reducing the basic reproduction number and controlling cholera spread. [ABSTRACT FROM AUTHOR]