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Model-driven degradation modeling approaches:Investigation and review

Chinese Journal of Aeronautics 2020年第4期33卷 1137-1153页

作者： Rui KANG Wenjun GONG Yunxia CHEN School of Reliability and Systems Engineering Beihang UniversityBeijing 100083China

The second law of thermodynamics implies that any animate and inanimate systems degrade and inevitably stops *** is irreversible over time that can be labeled as‘‘the degradation arrow of time".From perspective of products’reliability design,it is essential to build appropriate models of describing the degradation arrow of *** current modeling approaches mainly include the model-driven(having assumed forms based on cognitive experience of mankind)and data-driven(using data learning techniques without form hypothesis)*** this paper,we just investigate and review the model-driven degradation approaches,hoping to provide suggestions of the model construction or selection for scholars or ***,for the single mechanism,degradation law models and stochastic process models are classified as separately depicting the tendency and fluctuation of *** the degradation law model,we propose the concept of meta-models as original types for various personal *** the stochastic process model,two main types including the non-monotonic and monotonical types are ***,four multi-mechanism degradation types are discussed,that are competitive degradation,multi-stage degradation,coexistence of degradation and impact,and coexistence of degradation and ***,for the multi-performance degradation,independent and coupling models are *** forms,connotations,applicability and insufficiency of these models are described with a series of examples from the literature and our own *** final explicit suggestions about the potential future work are provided for the development of new degradation models.

关键词： degradation law degradation process Meta-models Multi-mechanism Multi-performance

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Research on Pesticide Residues of Cypermethrin in Lettuce

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International Journal of Technology Management 2015年第5期 130-132页

作者： Lei LI Hanqing ZHAO Xin XU Northeast Petroleum University QinhuangdaoHebei 066000 China

In order to find the effective method to reduce pesticide residues in vegetables, and promote the healthy development of vegetable industry. The paper used chlorothalonil, fenvalerate, dimethoate widely used pesticides as experimental material, using GC method to measure residual dynamics of vegetable pesticide. The results show that： fenvalerate, dimethoate, chlorothalonil pesticide residues in lettuce was higher than that tomato in the application day, respectively reach at 42.9%, 44.9%, 57.8%, pesticide degradation rate in open land were significantly higher than those in greenhouse within 5-20 days. The test showed that： the degradation of pesticide amount is in 8.77%r-19.64% within 1 days. The initial concentration of pesticides on vegetables are relevant with surface area of vegetable edible parts; the degradation speed of pesticide degradation rate in greenhouse vegetable is obviously slower than the open field vegetable; pesticide deposition phenomenon is an important factor affecting the pesticide residues in greenhouse.

关键词： Cypermethrin Lettuce Analysis of pesticide residues degradation law

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