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Yulong Bao,Yongkang Luo,Yuemei Zhang,Yangfan Shen,Huixing Shen 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.5
To study the quality changes of blunt-snout bream (Megalobrama amblycephala) stored at chilled temperature (0-9oC), a global stability index (GSI) method was developed. Sensory score, total aerobic counts (TAC),total volatile basic nitrogen (TVB-N), and K value (as a percentage of the ratio between HxR (hypoxanthine riboside)+Hx (hypoxanthine) to the total ATP (adenosine triphosphate) and its degradation products) were determined to form a GSI value, and a predictive model of GSI was established by combining zero order kinetics with the Arrhenius equation. The results showed that the goodness of fit remained a high level (R2>0.97), the activation energy (EA) and the corresponding pre-exponential factor (k0) were 83.49 kJ/mol and 4.78×1014 respectively. Relative errors between experimental GSI values and predicted GSI values were all within ±15% before the 15th day. Therefore,the model could effectively predict the quality deterioration of blunt-snout bream during chilled storage.
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Optimal simulation design for weight reduction of periodic titanium alloy space structures
Liang Xuan,Yanhe Zhang,Siyuan Peng,Yongkang Shen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.2
This research investigates the spatial structure of periodic titanium alloys. The response surface optimization method is used to optimize the weight reduction structure of combined model parameters. Under the condition of unidirectional load, the stress and strain results of each model group of a 3D structure with weight reduction rates of 30 %, 50 %, and 70 % are obtained through simulation analysis. Furthermore, the characteristics of the selective laser melting (SLM) forming process are incorporated, and a comparative analysis of the maximum equivalent stress of each group of models under unidirectional load is performed. The optimal structural form and its parameters suitable for multi-directional loads are screened. By using SLM to form the optimal model and carry out a loading test, the ultimate load of the model under different weight reduction rates is obtained to provide a theoretical basis for the next step of 3D printing process research.
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