Recently, the Ministry of Transport's Application Foundation Project (Key Platform) "Study on the Safety Performance Testing and Accident Probability Assessment Method for Large-scale Port Facilities" passed the acceptance. The results provide high-reliability, high-flexibility technical means for the rapid detection and diagnosis of large-scale equipment in the port, which contributes to the safe operation and scientific management of major port equipment. . .
Before talking about perilla seed oil, let`s talk about perilla first. Many people don`t know what perilla is when they mention it. If I mention another name, I think everyone will know it - perilla, which everyone usually likes. Wrap the barbecued meat with perilla leaves and eat it. It is refreshing and relieves greasiness, and it also has the unique fragrance of perilla. There are many names for perilla, and each region has its own name: white perilla, red perilla, red perilla, fragrant perilla, etc. This is a plant that matures in one year and is used in medicine, health products and food. It has a wide range of uses. Perilla was one of the first batch of 60 plants announced by the former Ministry of Health as both food and medicine. Perilla began to be eaten by everyone as early as more than 2,000 years ago, and it is recorded in "Compendium of Materia Medica" and "Qi Min Yao Shu".
Perilla seed oil is obtained by pressing perilla seeds, and the oil content of perilla seeds is about 30~40%. According to the data measured by the Testing Center of Northwest A&F University, the composition and content of perilla seeds are: fat 45.03%, protein 21.05%, crude fiber 19.74%, non-nitrogen substances 9.65%, and ash 4.53%. It has the highest fat content. Among the fatty acids in perilla seed oil, the a-linolenic acid content reaches 61.2%, linoleic acid is 9.4%, oleic acid is 21%, and the unsaturated fatty acid content is 91.6%. The highest a-linolenic acid content among the 55 plants containing a-linolenic acid (>30%), its perilla content ranks among the best.
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Large-scale port equipment is the main equipment for port loading and unloading operations. It has complex technology, frequent use, and strong continuity of operations. Its safety is crucial to the security development of the entire port. The safe working life of large-scale port facilities depends mainly on the lifespan of metal structures. According to statistics, more than 80% of large-scale equipment structural fractures are caused by metal fatigue. Due to the complexity of the factors that affect the fatigue of metal structures, large-scale port facilities are located in the marine environment, and it is difficult to accurately detect and evaluate the safety life of equipment.
The project proposes a wireless-based detection technique method combining stress-strain, acoustic emission, and ultrasonic flaw detection: Through the acoustic emission monitoring experiment of commonly used structural material deformation in ports, the microscopic mechanism of acoustic emission sources in the process of steel damage is studied, and large-scale steel structural materials in ports are obtained. Deformation and fatigue damage process acoustic emission signal characteristics; Based on acoustic emission damage signal analysis and probabilistic fracture theory method, a multi-dimensional stress comprehensive probability safety assessment system for steel structures in China's ports is constructed to enable quantitative characterization and detection of damage states. .
The project is jointly undertaken by the Ministry of Transport and Maritime Sciences and Wuhan University of Technology.