In the last 30 years various mathematical models have been used to identify the effect of component failures on the performance of a system. The most frequently used technique for system reliability assessment is Fault Tree Analysis (FTA) and a large proportion of its popularity can be attributed to the fact that it provides a very good documentation of the way that the system failure logic was...

objectives: the aim of this study was to assess nutritional status and identify the most significant mna-items (mini nutritional assessment) to accelerate the determination of nutritional risk of heart-failure in elderly patients. methods and materials: the present research was a cross-sectional descriptive analytical survey on hospitalized heart- failure elderly patients (n=225). the sampling ...

Many systems can be modelled as a mission made up of a sequence of discrete phases. Each phase has a different requirement for successful completion and mission failure will result if any phase is unsuccessful. Fault tree analysis and Markov techniques have been used previously to model this type of system for non-repairable and repairable systems respectively. Cause-consequence analysis is an ...

Safety and failure in gas pipelines are very important in gas and petroleum industry. For this reason, it is important to study the effect of different parameters in order to reach the maximum safety in design and application. In this paper, a three dimensional finite element analysis is carried out to study the effect of crack length, crack depth, crack position, internal pressure and pipe thi...

The failure assessment line (FAL) describes the interaction between plastic and fracture of flawed steel components subjected to tension or bending. This paper quantifies model uncertainty FAL as provided in internationally used British Standard BS 7910:2019 by comparing with actual load 82 wide plate 4 tubular joint tests. In findings others, it is demonstrated that accuracy significantly impr...

background: the reliability and safety of gas refineries are strongly associated with the reliability of other parts of the system. defect and failure in one part of a system can cause total system breakdown or accident. the failure and damage in these equipment such as transformers and boilers results in not only the equipment damage and human injuries but also productivity reduction. the purp...